[PATCH v5 0/7] mfd: Add support for Asus Transformer embedded controller

[PATCH v5 0/7] mfd: Add support for Asus Transformer embedded controller

[Svyatoslav Ryhel]

Add support for embedded controller used in Asus Transformers for
managing power and input functions.

---
Changes in v2:
- converted sysfs debug exports into debugfs
- added kernel-doc comments for exposed functions
- fixed minor typos and inconsistencies

Changes in v3:
- dropped DockRAM commits (both schema and driver)
- integrated DockRAM functionality directly into the controller driver
- EC schema moved to embedded controllers folder
- removed all cell descriptions from the schema
- removed all compatibles from the cell drivers
- adjusted naming conventions to better align with the ASUS Transformers
- defined EC variant sets to provide coverage for all known devices

Changes in v4:
- grouped known programming models of EC chronologically (both schema
  and driver)
- call debugfs init only if CONFIG_DEBUG_FS is enabled

Changes in v5:
- added asus,tf600t-ec-dock compatible to schema
- rebased on top of v7.0
- kzalloc > kzalloc_obj in keys and kbc
---

Michał Mirosław (6):
  mfd: Add driver for ASUS Transformer embedded controller
  input: serio: Add driver for ASUS Transformer dock keyboard and
    touchpad
  input: keyboard: Add driver for ASUS Transformer dock multimedia keys
  leds: Add driver for ASUS Transformer LEDs
  power: supply: Add driver for ASUS Transformer battery
  power: supply: Add charger driver for Asus Transformers

Svyatoslav Ryhel (1):
  dt-bindings: embedded-controller: document ASUS Transformer EC

 .../asus,tf201-ec-pad.yaml                    | 119 +++
 drivers/input/keyboard/Kconfig                |  10 +
 drivers/input/keyboard/Makefile               |   1 +
 .../input/keyboard/asus-transformer-ec-keys.c | 272 +++++++
 drivers/input/serio/Kconfig                   |  15 +
 drivers/input/serio/Makefile                  |   1 +
 drivers/input/serio/asus-transformer-ec-kbc.c | 147 ++++
 drivers/leds/Kconfig                          |  11 +
 drivers/leds/Makefile                         |   1 +
 drivers/leds/leds-asus-transformer-ec.c       |  79 ++
 drivers/mfd/Kconfig                           |  14 +
 drivers/mfd/Makefile                          |   1 +
 drivers/mfd/asus-transformer-ec.c             | 762 ++++++++++++++++++
 drivers/power/supply/Kconfig                  |  22 +
 drivers/power/supply/Makefile                 |   2 +
 .../supply/asus-transformer-ec-battery.c      | 272 +++++++
 .../supply/asus-transformer-ec-charger.c      | 193 +++++
 include/linux/mfd/asus-transformer-ec.h       | 162 ++++
 18 files changed, 2084 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/embedded-controller/asus,tf201-ec-pad.yaml
 create mode 100644 drivers/input/keyboard/asus-transformer-ec-keys.c
 create mode 100644 drivers/input/serio/asus-transformer-ec-kbc.c
 create mode 100644 drivers/leds/leds-asus-transformer-ec.c
 create mode 100644 drivers/mfd/asus-transformer-ec.c
 create mode 100644 drivers/power/supply/asus-transformer-ec-battery.c
 create mode 100644 drivers/power/supply/asus-transformer-ec-charger.c
 create mode 100644 include/linux/mfd/asus-transformer-ec.h

-- 
2.51.0

[PATCH v5 1/7] dt-bindings: embedded-controller: document ASUS Transformer EC

[Svyatoslav Ryhel]

Document embedded controller used in ASUS Transformer device series.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
---
 .../asus,tf201-ec-pad.yaml                    | 119 ++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/embedded-controller/asus,tf201-ec-pad.yaml

diff --git a/Documentation/devicetree/bindings/embedded-controller/asus,tf201-ec-pad.yaml b/Documentation/devicetree/bindings/embedded-controller/asus,tf201-ec-pad.yaml
new file mode 100644
index 000000000000..60b6375864aa
--- /dev/null
+++ b/Documentation/devicetree/bindings/embedded-controller/asus,tf201-ec-pad.yaml
@@ -0,0 +1,119 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/embedded-controller/asus,tf201-ec-pad.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ASUS Transformer's Embedded Controller
+
+description:
+  Several Nuvoton based Embedded Controllers attached to an I2C bus,
+  running a custom ASUS firmware, specific to the ASUS Transformer
+  device series.
+
+maintainers:
+  - Svyatoslav Ryhel <clamor95@gmail.com>
+
+properties:
+  compatible:
+    description:
+      The 'pad' suffix is used for the controller within the tablet, while
+      the 'dock' suffix refers to the controller in the mobile dock keyboard.
+    oneOf:
+      - enum:
+          - asus,sl101-ec-dock
+          - asus,tf101-ec-dock
+          - asus,tf201-ec-pad
+          - asus,tf600t-ec-dock
+          - asus,tf600t-ec-pad
+
+      - items:
+          - enum:
+              - asus,tf101g-ec-dock
+              - asus,tf201-ec-dock
+              - asus,tf300t-ec-dock
+              - asus,tf300tg-ec-dock
+              - asus,tf300tl-ec-dock
+              - asus,tf700t-ec-dock
+          - const: asus,tf101-ec-dock
+
+      - items:
+          - enum:
+              - asus,tf300t-ec-pad
+              - asus,tf300tg-ec-pad
+              - asus,tf300tl-ec-pad
+              - asus,tf700t-ec-pad
+          - const: asus,tf201-ec-pad
+
+      - items:
+          - enum:
+              - asus,tf701t-ec-dock
+          - const: asus,tf600t-ec-dock
+
+      - items:
+          - enum:
+              - asus,p1801-t-ec-pad
+              - asus,tf701t-ec-pad
+          - const: asus,tf600t-ec-pad
+
+  reg:
+    description:
+      The ASUS Transformer EC has a main I2C address and an associated
+      DockRAM device, which provides power-related functions for the
+      embedded controller. Both addresses are required for operation.
+    minItems: 2
+
+  reg-names:
+    items:
+      - const: ec
+      - const: dockram
+
+  interrupts:
+    maxItems: 1
+
+  request-gpios:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - reg-names
+
+allOf:
+  - $ref: /schemas/power/supply/power-supply.yaml
+  - if:
+      properties:
+        compatible:
+          not:
+            contains:
+              const: asus,tf600t-ec-dock
+    then:
+      required:
+        - interrupts
+        - request-gpios
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      embedded-controller@19 {
+        compatible = "asus,tf201-ec-dock", "asus,tf101-ec-dock";
+        reg = <0x19>, <0x1b>;
+        reg-names = "ec", "dockram";
+
+        interrupt-parent = <&gpio>;
+        interrupts = <151 IRQ_TYPE_LEVEL_LOW>;
+
+        request-gpios = <&gpio 134 GPIO_ACTIVE_LOW>;
+
+        monitored-battery = <&dock_battery>;
+      };
+    };
+...
-- 
2.51.0

[PATCH v5 2/7] mfd: Add driver for ASUS Transformer embedded controller

[Svyatoslav Ryhel]

From: Michał Mirosław <mirq-linux@rere.qmqm.pl>

Support Nuvoton NPCE795-based ECs as used in Asus Transformer TF201,
TF300T, TF300TG, TF300TL and TF700T pad and dock, as well as TF101 dock
and TF600T, P1801-T and TF701T pad. This is a glue driver handling
detection and common operations for EC's functions.

Co-developed-by: Svyatoslav Ryhel <clamor95@gmail.com>
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
 drivers/mfd/Kconfig                     |  14 +
 drivers/mfd/Makefile                    |   1 +
 drivers/mfd/asus-transformer-ec.c       | 762 ++++++++++++++++++++++++
 include/linux/mfd/asus-transformer-ec.h | 162 +++++
 4 files changed, 939 insertions(+)
 create mode 100644 drivers/mfd/asus-transformer-ec.c
 create mode 100644 include/linux/mfd/asus-transformer-ec.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 7192c9d1d268..5aa4facfd2df 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -137,6 +137,20 @@ config MFD_AAT2870_CORE
 	  additional drivers must be enabled in order to use the
 	  functionality of the device.
 
+config MFD_ASUS_TRANSFORMER_EC
+	tristate "ASUS Transformer's embedded controller"
+	depends on I2C && OF
+	help
+	  Support ECs found in ASUS Transformer's Pad and Mobile Dock.
+
+	  This provides shared glue for functional part drivers:
+	    asus-transformer-ec-kbc, asus-transformer-ec-keys,
+	    leds-asus-transformer-ec, asus-transformer-ec-battery
+	    and asus-transformer-ec-charger.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called asus-transformer-ec.
+
 config MFD_AT91_USART
 	tristate "AT91 USART Driver"
 	select MFD_CORE
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index e75e8045c28a..fd80088d8a9a 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_MFD_88PM805)	+= 88pm805.o 88pm80x.o
 obj-$(CONFIG_MFD_88PM886_PMIC)	+= 88pm886.o
 obj-$(CONFIG_MFD_ACT8945A)	+= act8945a.o
 obj-$(CONFIG_MFD_SM501)		+= sm501.o
+obj-$(CONFIG_MFD_ASUS_TRANSFORMER_EC)	+= asus-transformer-ec.o
 obj-$(CONFIG_ARCH_BCM2835)	+= bcm2835-pm.o
 obj-$(CONFIG_MFD_BCM590XX)	+= bcm590xx.o
 obj-$(CONFIG_MFD_BD9571MWV)	+= bd9571mwv.o
diff --git a/drivers/mfd/asus-transformer-ec.c b/drivers/mfd/asus-transformer-ec.c
new file mode 100644
index 000000000000..aa3b9e31f3fc
--- /dev/null
+++ b/drivers/mfd/asus-transformer-ec.c
@@ -0,0 +1,762 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <linux/array_size.h>
+#include <linux/debugfs.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/asus-transformer-ec.h>
+#include <linux/mfd/core.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/property.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/unaligned.h>
+
+#define ASUSEC_RSP_BUFFER_SIZE		8
+
+struct asus_ec_chip_data {
+	const char *name;
+	const struct mfd_cell *mfd_devices;
+	unsigned int num_devices;
+	bool clr_fmode; /* clear Factory Mode bit in EC control register */
+};
+
+struct asus_ec_data {
+	struct asusec_info info;
+	struct mutex ecreq_lock; /* prevent simultaneous access */
+	struct gpio_desc *ecreq;
+	struct i2c_client *self;
+	const struct asus_ec_chip_data *data;
+	char ec_data[DOCKRAM_ENTRY_BUFSIZE];
+	bool logging_disabled;
+};
+
+struct dockram_ec_data {
+	struct mutex ctl_lock; /* prevent simultaneous access */
+	char ctl_data[DOCKRAM_ENTRY_BUFSIZE];
+};
+
+#define to_ec_data(ec) \
+	container_of(ec, struct asus_ec_data, info)
+
+/**
+ * asus_dockram_read - Read a register from the DockRAM device.
+ * @client: Handle to the DockRAM device.
+ * @reg: Register to read.
+ * @buf: Byte array into which data will be read; must be large enough to
+ *	 hold the data returned by the DockRAM.
+ *
+ * This executes the DockRAM read based on the SMBus "block read" protocol
+ * or its emulation. It extracts DOCKRAM_ENTRY_SIZE bytes from the set
+ * register address.
+ *
+ * Returns a negative errno code else zero on success.
+ */
+int asus_dockram_read(struct i2c_client *client, int reg, char *buf)
+{
+	struct device *dev = &client->dev;
+	int ret;
+
+	memset(buf, 0, DOCKRAM_ENTRY_BUFSIZE);
+	ret = i2c_smbus_read_i2c_block_data(client, reg,
+					    DOCKRAM_ENTRY_BUFSIZE, buf);
+	if (ret < 0)
+		return ret;
+
+	if (buf[0] > DOCKRAM_ENTRY_SIZE) {
+		dev_err(dev, "bad data len; buffer: %*ph; ret: %d\n",
+			DOCKRAM_ENTRY_BUFSIZE, buf, ret);
+		return -EPROTO;
+	}
+
+	dev_dbg(dev, "got data; buffer: %*ph; ret: %d\n",
+		DOCKRAM_ENTRY_BUFSIZE, buf, ret);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(asus_dockram_read);
+
+/**
+ * asus_dockram_write - Write a byte array to a register of the DockRAM device.
+ * @client: Handle to the DockRAM device.
+ * @reg: Register to write to.
+ * @buf: Byte array to be written (up to DOCKRAM_ENTRY_SIZE bytes).
+ *
+ * This executes the DockRAM write based on the SMBus "block write"
+ * protocol or its emulation. It writes DOCKRAM_ENTRY_SIZE bytes to the
+ * specified register address.
+ *
+ * Returns a negative errno code else zero on success.
+ */
+int asus_dockram_write(struct i2c_client *client, int reg, const char *buf)
+{
+	if (buf[0] > DOCKRAM_ENTRY_SIZE)
+		return -EINVAL;
+
+	dev_dbg(&client->dev, "sending data; buffer: %*ph\n", buf[0] + 1, buf);
+
+	return i2c_smbus_write_i2c_block_data(client, reg, buf[0] + 1, buf);
+}
+EXPORT_SYMBOL_GPL(asus_dockram_write);
+
+/**
+ * asus_dockram_access_ctl - Read from or write to the DockRAM control register.
+ * @client: Handle to the DockRAM device.
+ * @out: Pointer to a variable where the register value will be stored.
+ * @mask: Bitmask of bits to be cleared.
+ * @xor: Bitmask of bits to be set (via XOR).
+ *
+ * This performs a control register read if @out is provided and both @mask
+ * and @xor are zero. Otherwise, it performs a control register update if
+ * @mask and @xor are provided.
+ *
+ * Returns a negative errno code else zero on success.
+ */
+int asus_dockram_access_ctl(struct i2c_client *client, u64 *out, u64 mask,
+			    u64 xor)
+{
+	struct dockram_ec_data *priv = i2c_get_clientdata(client);
+	char *buf = priv->ctl_data;
+	u64 val;
+	int ret = 0;
+
+	guard(mutex)(&priv->ctl_lock);
+
+	ret = asus_dockram_read(client, ASUSEC_DOCKRAM_CONTROL, buf);
+	if (ret < 0)
+		goto exit;
+
+	if (buf[0] != ASUSEC_CTL_SIZE) {
+		ret = -EPROTO;
+		goto exit;
+	}
+
+	val = get_unaligned_le64(buf + 1);
+
+	if (out)
+		*out = val;
+
+	if (mask || xor) {
+		put_unaligned_le64((val & ~mask) ^ xor, buf + 1);
+		ret = asus_dockram_write(client, ASUSEC_DOCKRAM_CONTROL, buf);
+	}
+
+exit:
+	if (ret < 0)
+		dev_err(&client->dev, "Failed to access control flags: %d\n",
+			ret);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(asus_dockram_access_ctl);
+
+static void asus_ec_remove_notifier(struct device *dev, void *res)
+{
+	struct asusec_info *ec = dev_get_drvdata(dev->parent);
+	struct notifier_block **nb = res;
+
+	blocking_notifier_chain_unregister(&ec->notify_list, *nb);
+}
+
+/**
+ * devm_asus_ec_register_notifier - Managed registration of notifier to an
+ *				    ASUS EC blocking notifier chain.
+ * @pdev: Device requesting the notifier (used for resource management).
+ * @nb: Notifier block to be registered.
+ *
+ * Register a notifier to the ASUS EC blocking notifier chain. The notifier
+ * will be automatically unregistered when the requesting device is detached.
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int devm_asus_ec_register_notifier(struct platform_device *pdev,
+				   struct notifier_block *nb)
+{
+	struct asusec_info *ec = dev_get_drvdata(pdev->dev.parent);
+	struct notifier_block **res;
+	int ret;
+
+	res = devres_alloc(asus_ec_remove_notifier, sizeof(*res), GFP_KERNEL);
+	if (!res)
+		return -ENOMEM;
+
+	*res = nb;
+	ret = blocking_notifier_chain_register(&ec->notify_list, nb);
+	if (ret) {
+		devres_free(res);
+		return ret;
+	}
+
+	devres_add(&pdev->dev, res);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(devm_asus_ec_register_notifier);
+
+static int asus_ec_signal_request(const struct asusec_info *ec)
+{
+	struct asus_ec_data *priv = to_ec_data(ec);
+
+	guard(mutex)(&priv->ecreq_lock);
+
+	dev_dbg(&priv->self->dev, "EC request\n");
+
+	gpiod_set_value_cansleep(priv->ecreq, 1);
+	msleep(50);
+
+	gpiod_set_value_cansleep(priv->ecreq, 0);
+	msleep(200);
+
+	return 0;
+}
+
+static int asus_ec_write(struct asus_ec_data *priv, u16 data)
+{
+	int ret = i2c_smbus_write_word_data(priv->self, ASUSEC_WRITE_BUF, data);
+
+	dev_dbg(&priv->self->dev, "EC write: %04x, ret = %d\n", data, ret);
+	return ret;
+}
+
+static int asus_ec_read(struct asus_ec_data *priv, bool in_irq)
+{
+	int ret = i2c_smbus_read_i2c_block_data(priv->self, ASUSEC_READ_BUF,
+						sizeof(priv->ec_data),
+						priv->ec_data);
+
+	dev_dbg(&priv->self->dev, "EC read: %*ph, ret = %d%s\n",
+		sizeof(priv->ec_data), priv->ec_data,
+		ret, in_irq ? "; in irq" : "");
+
+	return ret;
+}
+
+/**
+ * asus_ec_i2c_command - Send a 16-bit command to the ASUS EC.
+ * @ec: Pointer to the shared ASUS EC structure.
+ * @data: The 16-bit command (word) to be sent.
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int asus_ec_i2c_command(const struct asusec_info *ec, u16 data)
+{
+	return asus_ec_write(to_ec_data(ec), data);
+}
+EXPORT_SYMBOL_GPL(asus_ec_i2c_command);
+
+static void asus_ec_clear_buffer(struct asus_ec_data *priv)
+{
+	int retry = ASUSEC_RSP_BUFFER_SIZE;
+
+	while (retry--) {
+		if (asus_ec_read(priv, false) < 0)
+			continue;
+
+		if (priv->ec_data[1] & ASUSEC_OBF_MASK)
+			continue;
+
+		break;
+	}
+}
+
+static int asus_ec_log_info(struct asus_ec_data *priv, unsigned int reg,
+			    const char *name, char **out)
+{
+	char buf[DOCKRAM_ENTRY_BUFSIZE];
+	int ret;
+
+	ret = asus_dockram_read(priv->info.dockram, reg, buf);
+	if (ret < 0)
+		return ret;
+
+	if (!priv->logging_disabled)
+		dev_info(&priv->self->dev, "%-14s: %.*s\n", name,
+			 buf[0], buf + 1);
+
+	if (out)
+		*out = kstrndup(buf + 1, buf[0], GFP_KERNEL);
+
+	return 0;
+}
+
+static int asus_ec_reset(struct asus_ec_data *priv)
+{
+	int retry, ret;
+
+	for (retry = 0; retry < 3; retry++) {
+		ret = asus_ec_write(priv, 0);
+		if (!ret)
+			return 0;
+
+		msleep(300);
+	}
+
+	return ret;
+}
+
+static int asus_ec_magic_debug(struct asus_ec_data *priv)
+{
+	u64 flag;
+	int ret;
+
+	ret = asus_ec_get_ctl(&priv->info, &flag);
+	if (ret < 0)
+		return ret;
+
+	flag &= ASUSEC_CTL_SUSB_MODE;
+	dev_info(&priv->self->dev, "EC FW behaviour: %s\n",
+		 flag ? "susb on when receive ec_req" :
+		 "susb on when system wakeup");
+
+	return 0;
+}
+
+static int asus_ec_set_factory_mode(struct asus_ec_data *priv, bool on)
+{
+	dev_info(&priv->self->dev, "Entering %s mode.\n", on ? "factory" :
+		 "normal");
+	return asus_ec_update_ctl(&priv->info, ASUSEC_CTL_FACTORY_MODE,
+				  on ? ASUSEC_CTL_FACTORY_MODE : 0);
+}
+
+static void asus_ec_handle_smi(struct asus_ec_data *priv, unsigned int code);
+
+static irqreturn_t asus_ec_interrupt(int irq, void *dev_id)
+{
+	struct asus_ec_data *priv = dev_id;
+	unsigned long notify_action;
+	int ret;
+
+	ret = asus_ec_read(priv, true);
+	if (ret <= 0 || !(priv->ec_data[1] & ASUSEC_OBF_MASK))
+		return IRQ_NONE;
+
+	notify_action = priv->ec_data[1];
+	if (notify_action & ASUSEC_SMI_MASK) {
+		unsigned int code = priv->ec_data[2];
+
+		asus_ec_handle_smi(priv, code);
+
+		notify_action |= code << 8;
+		dev_dbg(&priv->self->dev, "SMI code: 0x%02x\n", code);
+	}
+
+	blocking_notifier_call_chain(&priv->info.notify_list,
+				     notify_action, priv->ec_data);
+
+	return IRQ_HANDLED;
+}
+
+static int asus_ec_detect(struct asus_ec_data *priv)
+{
+	char *model = NULL;
+	int ret;
+
+	ret = asus_ec_reset(priv);
+	if (ret)
+		goto err_exit;
+
+	asus_ec_clear_buffer(priv);
+
+	ret = asus_ec_log_info(priv, ASUSEC_DOCKRAM_INFO_MODEL, "model", &model);
+	if (ret)
+		goto err_exit;
+
+	ret = asus_ec_log_info(priv, ASUSEC_DOCKRAM_INFO_FW, "FW version", NULL);
+	if (ret)
+		goto err_exit;
+
+	ret = asus_ec_log_info(priv, ASUSEC_DOCKRAM_INFO_CFGFMT, "Config format", NULL);
+	if (ret)
+		goto err_exit;
+
+	ret = asus_ec_log_info(priv, ASUSEC_DOCKRAM_INFO_HW, "HW version", NULL);
+	if (ret)
+		goto err_exit;
+
+	priv->logging_disabled = true;
+
+	ret = asus_ec_magic_debug(priv);
+	if (ret)
+		goto err_exit;
+
+	priv->info.model = model;
+	priv->info.name = priv->data->name;
+
+	if (priv->data->clr_fmode)
+		asus_ec_set_factory_mode(priv, false);
+
+err_exit:
+	if (ret)
+		dev_err(&priv->self->dev, "failed to access EC: %d\n", ret);
+
+	return ret;
+}
+
+static void asus_ec_handle_smi(struct asus_ec_data *priv, unsigned int code)
+{
+	dev_dbg(&priv->self->dev, "SMI interrupt: 0x%02x\n", code);
+
+	switch (code) {
+	case ASUSEC_SMI_HANDSHAKE:
+	case ASUSEC_SMI_RESET:
+		asus_ec_detect(priv);
+		break;
+	}
+}
+
+static ssize_t dockram_read(struct file *filp, char __user *buf,
+			    size_t count, loff_t *ppos)
+{
+	struct i2c_client *client = filp->private_data;
+	unsigned int reg, rsize;
+	ssize_t n_read = 0, val;
+	loff_t off = *ppos;
+	char *data;
+	int ret;
+
+	reg = off / DOCKRAM_ENTRY_SIZE;
+	off %= DOCKRAM_ENTRY_SIZE;
+	rsize = DOCKRAM_ENTRIES * DOCKRAM_ENTRY_SIZE;
+
+	if (!count)
+		return 0;
+
+	data = kmalloc(DOCKRAM_ENTRY_BUFSIZE, GFP_KERNEL);
+
+	while (reg < DOCKRAM_ENTRIES) {
+		unsigned int len = DOCKRAM_ENTRY_SIZE - off;
+
+		if (len > rsize)
+			len = rsize;
+
+		ret = asus_dockram_read(client, reg, data);
+		if (ret < 0) {
+			if (!n_read)
+				n_read = ret;
+			break;
+		}
+
+		val = copy_to_user(buf, data + 1 + off, len);
+		if (val == len)
+			return -EFAULT;
+
+		*ppos += len;
+		n_read += len;
+
+		if (len == rsize)
+			break;
+
+		rsize -= len;
+		buf += len;
+		off = 0;
+		++reg;
+	}
+
+	kfree(data);
+
+	return n_read;
+}
+
+static int dockram_write_one(struct i2c_client *client, int reg,
+			     const char __user *buf, size_t count)
+{
+	struct dockram_ec_data *priv = i2c_get_clientdata(client);
+	int ret;
+
+	if (!count || count > DOCKRAM_ENTRY_SIZE)
+		return -EINVAL;
+	if (buf[0] != count - 1)
+		return -EINVAL;
+
+	guard(mutex)(&priv->ctl_lock);
+
+	priv->ctl_data[0] = (u8)count;
+	memcpy(priv->ctl_data + 1, buf, count);
+	ret = asus_dockram_write(client, reg, priv->ctl_data);
+
+	return ret;
+}
+
+static ssize_t dockram_write(struct file *filp, const char __user *buf,
+			     size_t count, loff_t *ppos)
+{
+	struct i2c_client *client = filp->private_data;
+	unsigned int reg;
+	loff_t off = *ppos;
+	int ret;
+
+	if (off % DOCKRAM_ENTRY_SIZE != 0)
+		return -EINVAL;
+
+	reg = off / DOCKRAM_ENTRY_SIZE;
+	if (reg >= DOCKRAM_ENTRIES)
+		return -EINVAL;
+
+	ret = dockram_write_one(client, reg, buf, count);
+
+	return ret < 0 ? ret : count;
+}
+
+static const struct debugfs_short_fops dockram_fops = {
+	.read	= dockram_read,
+	.write	= dockram_write,
+	.llseek	= default_llseek,
+};
+
+static int control_reg_get(void *client, u64 *val)
+{
+	return asus_dockram_access_ctl(client, val, 0, 0);
+}
+
+static int control_reg_set(void *client, u64 val)
+{
+	return asus_dockram_access_ctl(client, NULL, ~0ull, val);
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(control_reg_fops, control_reg_get,
+			 control_reg_set, "%016llx\n");
+
+static int ec_request_set(void *ec, u64 val)
+{
+	if (val)
+		asus_ec_signal_request(ec);
+
+	return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(ec_request_fops, NULL, ec_request_set, "%llu\n");
+
+static int ec_irq_set(void *ec, u64 val)
+{
+	struct asus_ec_data *priv = to_ec_data(ec);
+
+	if (val)
+		irq_wake_thread(priv->self->irq, priv);
+
+	return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(ec_irq_fops, NULL, ec_irq_set, "%llu\n");
+
+static void asus_ec_debugfs_remove(void *debugfs_root)
+{
+	debugfs_remove_recursive(debugfs_root);
+}
+
+static void devm_asus_ec_debugfs_init(struct device *dev)
+{
+	struct asusec_info *ec = dev_get_drvdata(dev);
+	struct asus_ec_data *priv = to_ec_data(ec);
+	struct dentry *debugfs_root, *dockram_dir;
+	char *name = devm_kasprintf(dev, GFP_KERNEL, "asus-ec-%s",
+				    priv->data->name);
+
+	debugfs_root = debugfs_create_dir(name, NULL);
+	dockram_dir = debugfs_create_dir("dockram", debugfs_root);
+
+	debugfs_create_file("ec_irq", 0200, debugfs_root, ec,
+			    &ec_irq_fops);
+	debugfs_create_file("ec_request", 0200, debugfs_root, ec,
+			    &ec_request_fops);
+	debugfs_create_file("control_reg", 0644, dockram_dir,
+			    priv->info.dockram, &control_reg_fops);
+	debugfs_create_file("dockram", 0644, dockram_dir,
+			    priv->info.dockram, &dockram_fops);
+
+	devm_add_action_or_reset(dev, asus_ec_debugfs_remove, debugfs_root);
+}
+
+static void asus_ec_release_dockram_dev(void *client)
+{
+	i2c_unregister_device(client);
+}
+
+static struct i2c_client *devm_asus_dockram_get(struct device *dev)
+{
+	struct i2c_client *parent = to_i2c_client(dev);
+	struct i2c_client *dockram;
+	struct dockram_ec_data *priv;
+	int ret;
+
+	dockram = i2c_new_ancillary_device(parent, "dockram",
+					   parent->addr + 2);
+	if (IS_ERR(dockram))
+		return dockram;
+
+	ret = devm_add_action_or_reset(dev, asus_ec_release_dockram_dev,
+				       dockram);
+	if (ret)
+		return ERR_PTR(ret);
+
+	priv = devm_kzalloc(&dockram->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return ERR_PTR(-ENOMEM);
+
+	i2c_set_clientdata(dockram, priv);
+	mutex_init(&priv->ctl_lock);
+
+	return dockram;
+}
+
+static int asus_ec_probe(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	struct asus_ec_data *priv;
+	int ret;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
+		return dev_err_probe(dev, -ENXIO,
+			"I2C bus is missing required SMBus block mode support\n");
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->data = device_get_match_data(dev);
+	if (!priv->data)
+		return -ENODEV;
+
+	i2c_set_clientdata(client, priv);
+	priv->self = client;
+
+	priv->info.dockram = devm_asus_dockram_get(dev);
+	if (IS_ERR(priv->info.dockram))
+		return dev_err_probe(dev, PTR_ERR(priv->info.dockram),
+				     "failed to get dockram\n");
+
+	priv->ecreq = devm_gpiod_get(dev, "request", GPIOD_OUT_LOW);
+	if (IS_ERR(priv->ecreq))
+		return dev_err_probe(dev, PTR_ERR(priv->ecreq),
+				     "failed to get request GPIO\n");
+
+	BLOCKING_INIT_NOTIFIER_HEAD(&priv->info.notify_list);
+	mutex_init(&priv->ecreq_lock);
+
+	asus_ec_signal_request(&priv->info);
+
+	ret = asus_ec_detect(priv);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to detect EC version\n");
+
+	ret = devm_request_threaded_irq(dev, client->irq, NULL,
+					&asus_ec_interrupt,
+					IRQF_ONESHOT | IRQF_SHARED,
+					client->name, priv);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to register IRQ\n");
+
+	/* Parent I2C controller uses DMA, ASUS EC and child devices do not */
+	client->dev.coherent_dma_mask = 0;
+	client->dev.dma_mask = &client->dev.coherent_dma_mask;
+
+	if (IS_ENABLED(CONFIG_DEBUG_FS))
+		devm_asus_ec_debugfs_init(dev);
+
+	return devm_mfd_add_devices(dev, 0, priv->data->mfd_devices,
+				    priv->data->num_devices, NULL, 0, NULL);
+}
+
+static const struct mfd_cell asus_ec_sl101_dock_mfd_devices[] = {
+	{
+		.name = "asus-transformer-ec-kbc",
+	},
+};
+
+static const struct asus_ec_chip_data asus_ec_sl101_dock_data = {
+	.name = "dock",
+	.mfd_devices = asus_ec_sl101_dock_mfd_devices,
+	.num_devices = ARRAY_SIZE(asus_ec_sl101_dock_mfd_devices),
+	.clr_fmode = false,
+};
+
+static const struct mfd_cell asus_ec_tf101_dock_mfd_devices[] = {
+	{
+		.name = "asus-transformer-ec-battery",
+		.id = 1,
+	}, {
+		.name = "asus-transformer-ec-charger",
+		.id = 1,
+	}, {
+		.name = "asus-transformer-ec-led",
+		.id = 1,
+	}, {
+		.name = "asus-transformer-ec-keys",
+	}, {
+		.name = "asus-transformer-ec-kbc",
+	},
+};
+
+static const struct asus_ec_chip_data asus_ec_tf101_dock_data = {
+	.name = "dock",
+	.mfd_devices = asus_ec_tf101_dock_mfd_devices,
+	.num_devices = ARRAY_SIZE(asus_ec_tf101_dock_mfd_devices),
+	.clr_fmode = false,
+};
+
+static const struct mfd_cell asus_ec_tf201_pad_mfd_devices[] = {
+	{
+		.name = "asus-transformer-ec-battery",
+		.id = 0,
+	}, {
+		.name = "asus-transformer-ec-led",
+		.id = 0,
+	},
+};
+
+static const struct asus_ec_chip_data asus_ec_tf201_pad_data = {
+	.name = "pad",
+	.mfd_devices = asus_ec_tf201_pad_mfd_devices,
+	.num_devices = ARRAY_SIZE(asus_ec_tf201_pad_mfd_devices),
+	.clr_fmode = true,
+};
+
+static const struct mfd_cell asus_ec_tf600t_pad_mfd_devices[] = {
+	{
+		.name = "asus-transformer-ec-battery",
+		.id = 0,
+	}, {
+		.name = "asus-transformer-ec-charger",
+		.id = 0,
+	}, {
+		.name = "asus-transformer-ec-led",
+		.id = 0,
+	},
+};
+
+static const struct asus_ec_chip_data asus_ec_tf600t_pad_data = {
+	.name = "pad",
+	.mfd_devices = asus_ec_tf600t_pad_mfd_devices,
+	.num_devices = ARRAY_SIZE(asus_ec_tf600t_pad_mfd_devices),
+	.clr_fmode = true,
+};
+
+static const struct of_device_id asus_ec_match[] = {
+	{ .compatible = "asus,sl101-ec-dock", .data = &asus_ec_sl101_dock_data },
+	{ .compatible = "asus,tf101-ec-dock", .data = &asus_ec_tf101_dock_data },
+	{ .compatible = "asus,tf201-ec-pad", .data = &asus_ec_tf201_pad_data },
+	{ .compatible = "asus,tf600t-ec-pad", .data = &asus_ec_tf600t_pad_data },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, asus_ec_match);
+
+static struct i2c_driver asus_ec_driver = {
+	.driver	= {
+		.name = "asus-transformer-ec",
+		.of_match_table = asus_ec_match,
+	},
+	.probe = asus_ec_probe,
+};
+module_i2c_driver(asus_ec_driver);
+
+MODULE_AUTHOR("Michał Mirosław <mirq-linux@rere.qmqm.pl>");
+MODULE_AUTHOR("Svyatoslav Ryhel <clamor95@gmail.com>");
+MODULE_DESCRIPTION("ASUS Transformer's EC driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mfd/asus-transformer-ec.h b/include/linux/mfd/asus-transformer-ec.h
new file mode 100644
index 000000000000..0a72de40352e
--- /dev/null
+++ b/include/linux/mfd/asus-transformer-ec.h
@@ -0,0 +1,162 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __MFD_ASUS_TRANSFORMER_EC_H
+#define __MFD_ASUS_TRANSFORMER_EC_H
+
+#include <linux/notifier.h>
+#include <linux/platform_device.h>
+#include <linux/workqueue.h>
+
+struct i2c_client;
+
+struct asusec_info {
+	const char *model;
+	const char *name;
+	struct i2c_client *dockram;
+	struct workqueue_struct *wq;
+	struct blocking_notifier_head notify_list;
+};
+
+#define DOCKRAM_ENTRIES			0x100
+#define DOCKRAM_ENTRY_SIZE		32
+#define DOCKRAM_ENTRY_BUFSIZE		(DOCKRAM_ENTRY_SIZE + 1)
+
+/* interrupt sources */
+#define ASUSEC_OBF_MASK			BIT(0)
+#define ASUSEC_KEY_MASK			BIT(2)
+#define ASUSEC_KBC_MASK			BIT(3)
+#define ASUSEC_AUX_MASK			BIT(5)
+#define ASUSEC_SCI_MASK			BIT(6)
+#define ASUSEC_SMI_MASK			BIT(7)
+
+/* SMI notification codes */
+#define ASUSEC_SMI_POWER_NOTIFY		0x31	/* [un]plugging USB cable */
+#define ASUSEC_SMI_HANDSHAKE		0x50	/* response to ec_req edge */
+#define ASUSEC_SMI_WAKE			0x53
+#define ASUSEC_SMI_RESET		0x5f
+#define ASUSEC_SMI_ADAPTER_EVENT	0x60	/* [un]plugging charger to dock */
+#define ASUSEC_SMI_BACKLIGHT_ON		0x63
+#define ASUSEC_SMI_AUDIO_DOCK_IN	0x70
+
+#define ASUSEC_SMI_ACTION(code)		(ASUSEC_SMI_MASK | ASUSEC_OBF_MASK | \
+					(ASUSEC_SMI_##code << 8))
+
+/* control register [0x0a] layout */
+#define ASUSEC_CTL_SIZE			8
+
+/*
+ * EC reports power from 40-pin connector in the LSB of the control
+ * register.  The following values have been observed (xor 0x02):
+ *
+ * PAD-ec no-plug  0x40 / PAD-ec DOCK     0x20 / DOCK-ec no-plug 0x40
+ * PAD-ec AC       0x25 / PAD-ec DOCK+AC  0x24 / DOCK-ec AC      0x25
+ * PAD-ec USB      0x45 / PAD-ec DOCK+USB 0x24 / DOCK-ec USB     0x41
+ */
+
+#define ASUSEC_CTL_DIRECT_POWER_SOURCE	BIT_ULL(0)
+#define ASUSEC_STAT_CHARGING		BIT_ULL(2)
+#define ASUSEC_CTL_FULL_POWER_SOURCE	BIT_ULL(5)
+#define ASUSEC_CTL_SUSB_MODE		BIT_ULL(9)
+#define ASUSEC_CMD_SUSPEND_S3		BIT_ULL(33)
+#define ASUSEC_CTL_TEST_DISCHARGE	BIT_ULL(35)
+#define ASUSEC_CMD_SUSPEND_INHIBIT	BIT_ULL(37)
+#define ASUSEC_CTL_FACTORY_MODE		BIT_ULL(38)
+#define ASUSEC_CTL_KEEP_AWAKE		BIT_ULL(39)
+#define ASUSEC_CTL_USB_CHARGE		BIT_ULL(40)
+#define ASUSEC_CTL_LED_BLINK		BIT_ULL(40)
+#define ASUSEC_CTL_LED_AMBER		BIT_ULL(41)
+#define ASUSEC_CTL_LED_GREEN		BIT_ULL(42)
+#define ASUSEC_CMD_SWITCH_HDMI		BIT_ULL(56)
+#define ASUSEC_CMD_WIN_SHUTDOWN		BIT_ULL(62)
+
+#define ASUSEC_DOCKRAM_INFO_MODEL	0x01
+#define ASUSEC_DOCKRAM_INFO_FW		0x02
+#define ASUSEC_DOCKRAM_INFO_CFGFMT	0x03
+#define ASUSEC_DOCKRAM_INFO_HW		0x04
+#define ASUSEC_DOCKRAM_CONTROL		0x0a
+#define ASUSEC_DOCKRAM_BATT_CTL		0x14
+
+#define ASUSEC_WRITE_BUF		0x64
+#define ASUSEC_READ_BUF			0x6a
+
+/* dockram comm */
+int asus_dockram_read(struct i2c_client *client, int reg, char *buf);
+int asus_dockram_write(struct i2c_client *client, int reg, const char *buf);
+int asus_dockram_access_ctl(struct i2c_client *client,
+			    u64 *out, u64 mask, u64 xor);
+
+/* EC public API */
+
+/**
+ * cell_to_ec - Request the shared ASUS EC structure via a subdevice's pdev.
+ * @pdev: EC subdevice pdev requesting access to the shared ASUS EC structure.
+ *
+ * Returns a pointer to the asusec_info structure.
+ */
+static inline struct asusec_info *cell_to_ec(struct platform_device *pdev)
+{
+	return dev_get_drvdata(pdev->dev.parent);
+}
+
+/**
+ * asus_ec_get_ctl - Read from the DockRAM control register.
+ * @ec:  Pointer to the shared ASUS EC structure.
+ * @out: Pointer to the variable where the register value will be stored.
+ *
+ * Performs a control register read and stores the value in @out.
+ *
+ * Return: 0 on success, or a negative errno code on failure.
+ */
+static inline int asus_ec_get_ctl(const struct asusec_info *ec, u64 *out)
+{
+	return asus_dockram_access_ctl(ec->dockram, out, 0, 0);
+}
+
+/**
+ * asus_ec_update_ctl - Update the DockRAM control register.
+ * @ec:   Pointer to the shared ASUS EC structure.
+ * @mask: Bitmask of bits to be cleared.
+ * @xor:  Bitmask of bits to be toggled or set (via XOR).
+ *
+ * Performs a read-modify-write update on the control register using
+ * the provided @mask and @xor values.
+ *
+ * Return: 0 on success, or a negative errno code on failure.
+ */
+static inline int asus_ec_update_ctl(const struct asusec_info *ec,
+				     u64 mask, u64 xor)
+{
+	return asus_dockram_access_ctl(ec->dockram, NULL, mask, xor);
+}
+
+/**
+ * asus_ec_set_ctl_bits - Sets bits of the DockRAM control register.
+ * @ec:   Pointer to the shared ASUS EC structure.
+ * @mask: Bitmask of bits to be set.
+ *
+ * Sets bits of the control register using the provided @mask value.
+ *
+ * Return: 0 on success, or a negative errno code on failure.
+ */
+static inline int asus_ec_set_ctl_bits(const struct asusec_info *ec, u64 mask)
+{
+	return asus_dockram_access_ctl(ec->dockram, NULL, mask, mask);
+}
+
+/**
+ * asus_ec_clear_ctl_bits - Clears bits of the DockRAM control register.
+ * @ec:   Pointer to the shared ASUS EC structure.
+ * @mask: Bitmask of bits to be cleared.
+ *
+ * Clears bits of the control register using the provided @mask value.
+ *
+ * Return: 0 on success, or a negative errno code on failure.
+ */
+static inline int asus_ec_clear_ctl_bits(const struct asusec_info *ec, u64 mask)
+{
+	return asus_dockram_access_ctl(ec->dockram, NULL, mask, 0);
+}
+
+int asus_ec_i2c_command(const struct asusec_info *ec, u16 data);
+int devm_asus_ec_register_notifier(struct platform_device *dev,
+				   struct notifier_block *nb);
+#endif /* __MFD_ASUS_TRANSFORMER_EC_H */
-- 
2.51.0

[PATCH v5 3/7] input: serio: Add driver for ASUS Transformer dock keyboard and touchpad

[Svyatoslav Ryhel]

From: Michał Mirosław <mirq-linux@rere.qmqm.pl>

Add input driver for ASUS Transformer dock keyboard and touchpad.

Some keys in ASUS Dock report keycodes that don't make sense according to
their position, this patch modifies the incoming data that is sent to
serio to send proper scancodes.

Co-developed-by: Ion Agorria <ion@agorria.com>
Signed-off-by: Ion Agorria <ion@agorria.com>
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
---
 drivers/input/serio/Kconfig                   |  15 ++
 drivers/input/serio/Makefile                  |   1 +
 drivers/input/serio/asus-transformer-ec-kbc.c | 147 ++++++++++++++++++
 3 files changed, 163 insertions(+)
 create mode 100644 drivers/input/serio/asus-transformer-ec-kbc.c

diff --git a/drivers/input/serio/Kconfig b/drivers/input/serio/Kconfig
index c7ef347a4dff..1ca17ba632cc 100644
--- a/drivers/input/serio/Kconfig
+++ b/drivers/input/serio/Kconfig
@@ -97,6 +97,21 @@ config SERIO_RPCKBD
 	  To compile this driver as a module, choose M here: the
 	  module will be called rpckbd.
 
+config SERIO_ASUS_TRANSFORMER_EC
+	tristate "Asus Transformer's Dock keyboard and touchpad controller"
+	depends on MFD_ASUS_TRANSFORMER_EC
+	help
+	  Say Y here if you want to use the keyboard and/or touchpad on
+	  Asus Transformed's Mobile Dock.
+
+	  For keyboard support you also need atkbd driver.
+
+	  For touchpad support you also need psmouse driver with Elantech
+	  touchpad option enabled.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called asus-transformer-ec-kbc.
+
 config SERIO_AMBAKMI
 	tristate "AMBA KMI keyboard controller"
 	depends on ARM_AMBA
diff --git a/drivers/input/serio/Makefile b/drivers/input/serio/Makefile
index 6d97bad7b844..9ecf0d011863 100644
--- a/drivers/input/serio/Makefile
+++ b/drivers/input/serio/Makefile
@@ -13,6 +13,7 @@ obj-$(CONFIG_SERIO_CT82C710)	+= ct82c710.o
 obj-$(CONFIG_SERIO_RPCKBD)	+= rpckbd.o
 obj-$(CONFIG_SERIO_SA1111)	+= sa1111ps2.o
 obj-$(CONFIG_SERIO_AMBAKMI)	+= ambakmi.o
+obj-$(CONFIG_SERIO_ASUS_TRANSFORMER_EC)	+= asus-transformer-ec-kbc.o
 obj-$(CONFIG_SERIO_Q40KBD)	+= q40kbd.o
 obj-$(CONFIG_SERIO_GSCPS2)	+= gscps2.o
 obj-$(CONFIG_HP_SDC)		+= hp_sdc.o
diff --git a/drivers/input/serio/asus-transformer-ec-kbc.c b/drivers/input/serio/asus-transformer-ec-kbc.c
new file mode 100644
index 000000000000..47fd6e48c989
--- /dev/null
+++ b/drivers/input/serio/asus-transformer-ec-kbc.c
@@ -0,0 +1,147 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/i8042.h>
+#include <linux/mfd/asus-transformer-ec.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/serio.h>
+
+struct asus_ec_kbc_data {
+	struct notifier_block nb;
+	struct asusec_info *ec;
+	struct serio *sdev[2];
+};
+
+static int asus_ec_kbc_notify(struct notifier_block *nb,
+			      unsigned long action, void *data_)
+{
+	struct asus_ec_kbc_data *priv = container_of(nb, struct asus_ec_kbc_data, nb);
+	unsigned int port_idx, n;
+	u8 *data = data_;
+
+	if (action & (ASUSEC_SMI_MASK | ASUSEC_SCI_MASK))
+		return NOTIFY_DONE;
+	else if (action & ASUSEC_AUX_MASK)
+		port_idx = 1;
+	else if (action & (ASUSEC_KBC_MASK | ASUSEC_KEY_MASK))
+		port_idx = 0;
+	else
+		return NOTIFY_DONE;
+
+	n = data[0] - 1;
+	data += 2;
+
+	/*
+	 * We need to replace these incoming data for keys:
+	 * RIGHT_META Press   0xE0 0x27      -> LEFT_ALT   Press   0x11
+	 * RIGHT_META Release 0xE0 0xF0 0x27 -> LEFT_ALT   Release 0xF0 0x11
+	 * COMPOSE    Press   0xE0 0x2F      -> RIGHT_META Press   0xE0 0x27
+	 * COMPOSE    Release 0xE0 0xF0 0x2F -> RIGHT_META Release 0xE0 0xF0 0x27
+	 */
+
+	if (port_idx == 0 && n >= 2 && data[0] == 0xE0) {
+		if (n == 3 && data[1] == 0xF0) {
+			switch (data[2]) {
+			case 0x27:
+				data[0] = 0xF0;
+				data[1] = 0x11;
+				n = 2;
+				break;
+			case 0x2F:
+				data[2] = 0x27;
+				break;
+			}
+		} else if (n == 2) {
+			switch (data[1]) {
+			case 0x27:
+				data[0] = 0x11;
+				n = 1;
+				break;
+			case 0x2F:
+				data[1] = 0x27;
+				break;
+			}
+		}
+	}
+
+	while (n--)
+		serio_interrupt(priv->sdev[port_idx], *data++, 0);
+
+	return NOTIFY_OK;
+}
+
+static int asus_ec_serio_write(struct serio *port, unsigned char data)
+{
+	const struct asusec_info *ec = port->port_data;
+
+	return asus_ec_i2c_command(ec, (data << 8) | port->id.extra);
+}
+
+static void asus_ec_serio_remove(void *data)
+{
+	serio_unregister_port(data);
+}
+
+static int asus_ec_register_serio(struct platform_device *pdev, int idx,
+				  const char *name, int cmd)
+{
+	struct asus_ec_kbc_data *priv = platform_get_drvdata(pdev);
+	struct i2c_client *parent = to_i2c_client(pdev->dev.parent);
+	struct serio *port = kzalloc_obj(*port);
+
+	if (!port)
+		return -ENOMEM;
+
+	priv->sdev[idx] = port;
+	port->dev.parent = &pdev->dev;
+	port->id.type = SERIO_8042;
+	port->id.extra = cmd & 0xFF;
+	port->write = asus_ec_serio_write;
+	port->port_data = (void *)priv->ec;
+	snprintf(port->name, sizeof(port->name), "%s %s",
+		 priv->ec->model, name);
+	snprintf(port->phys, sizeof(port->phys), "i2c-%u-%04x/serio%d",
+		 i2c_adapter_id(parent->adapter), parent->addr, idx);
+
+	serio_register_port(port);
+
+	return devm_add_action_or_reset(&pdev->dev, asus_ec_serio_remove, port);
+}
+
+static int asus_ec_kbc_probe(struct platform_device *pdev)
+{
+	struct asusec_info *ec = cell_to_ec(pdev);
+	struct asus_ec_kbc_data *priv;
+	int ret;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, priv);
+	priv->ec = ec;
+
+	ret = asus_ec_register_serio(pdev, 0, "Keyboard", 0);
+	if (ret < 0)
+		return ret;
+
+	ret = asus_ec_register_serio(pdev, 1, "Touchpad", I8042_CMD_AUX_SEND);
+	if (ret < 0)
+		return ret;
+
+	priv->nb.notifier_call = asus_ec_kbc_notify;
+
+	return devm_asus_ec_register_notifier(pdev, &priv->nb);
+}
+
+static struct platform_driver asus_ec_kbc_driver = {
+	.driver.name = "asus-transformer-ec-kbc",
+	.probe = asus_ec_kbc_probe,
+};
+module_platform_driver(asus_ec_kbc_driver);
+
+MODULE_AUTHOR("Michał Mirosław <mirq-linux@rere.qmqm.pl>");
+MODULE_DESCRIPTION("ASUS Transformer's Dock keyboard and touchpad controller driver");
+MODULE_LICENSE("GPL");
-- 
2.51.0

[PATCH v5 4/7] input: keyboard: Add driver for ASUS Transformer dock multimedia keys

[Svyatoslav Ryhel]

From: Michał Mirosław <mirq-linux@rere.qmqm.pl>

Add support for multimedia top button row of ASUS Transformer's Mobile
Dock keyboard. Driver is made that function keys (F1-F12) are used by
default which suits average Linux use better and with pressing
ScreenLock + AltGr function keys layout is switched to multimedia keys.
Since this only modifies codes sent by asus-ec-keys it doesn't affect
normal keyboards at all.

Co-developed-by: Ion Agorria <ion@agorria.com>
Signed-off-by: Ion Agorria <ion@agorria.com>
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
---
 drivers/input/keyboard/Kconfig                |  10 +
 drivers/input/keyboard/Makefile               |   1 +
 .../input/keyboard/asus-transformer-ec-keys.c | 272 ++++++++++++++++++
 3 files changed, 283 insertions(+)
 create mode 100644 drivers/input/keyboard/asus-transformer-ec-keys.c

diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 2ff4fef322c2..4e577e5cf216 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -89,6 +89,16 @@ config KEYBOARD_APPLESPI
 	  To compile this driver as a module, choose M here: the
 	  module will be called applespi.
 
+config KEYBOARD_ASUS_TRANSFORMER_EC
+	tristate "Asus Transformer's Mobile Dock multimedia keys"
+	depends on MFD_ASUS_TRANSFORMER_EC
+	help
+	  Say Y here if you want to use multimedia keys present on Asus
+	  Transformer's Mobile Dock.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called asus-transformer-ec-keys.
+
 config KEYBOARD_ATARI
 	tristate "Atari keyboard"
 	depends on ATARI
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index 2d906e14f3e2..575edb0e8eb4 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_KEYBOARD_ADP5585)		+= adp5585-keys.o
 obj-$(CONFIG_KEYBOARD_ADP5588)		+= adp5588-keys.o
 obj-$(CONFIG_KEYBOARD_AMIGA)		+= amikbd.o
 obj-$(CONFIG_KEYBOARD_APPLESPI)		+= applespi.o
+obj-$(CONFIG_KEYBOARD_ASUS_TRANSFORMER_EC)	+= asus-transformer-ec-keys.o
 obj-$(CONFIG_KEYBOARD_ATARI)		+= atakbd.o
 obj-$(CONFIG_KEYBOARD_ATKBD)		+= atkbd.o
 obj-$(CONFIG_KEYBOARD_BCM)		+= bcm-keypad.o
diff --git a/drivers/input/keyboard/asus-transformer-ec-keys.c b/drivers/input/keyboard/asus-transformer-ec-keys.c
new file mode 100644
index 000000000000..02516ccb0b12
--- /dev/null
+++ b/drivers/input/keyboard/asus-transformer-ec-keys.c
@@ -0,0 +1,272 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <linux/array_size.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/mfd/asus-transformer-ec.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#define ASUSEC_EXT_KEY_CODES		0x20
+
+struct asus_ec_keys_data {
+	struct notifier_block nb;
+	struct asusec_info *ec;
+	struct input_dev *xidev;
+	bool special_key_pressed;
+	bool special_key_mode;
+	unsigned short keymap[ASUSEC_EXT_KEY_CODES * 2];
+};
+
+static void asus_ec_input_event(struct input_handle *handle,
+				unsigned int event_type,
+				unsigned int event_code, int value)
+{
+	struct asus_ec_keys_data *priv = handle->handler->private;
+
+	/* Store special key state */
+	if (event_type == EV_KEY && event_code == KEY_RIGHTALT)
+		priv->special_key_pressed = !!value;
+}
+
+static int asus_ec_input_connect(struct input_handler *handler, struct input_dev *dev,
+				 const struct input_device_id *id)
+{
+	struct input_handle *handle;
+	int error;
+
+	handle = kzalloc_obj(*handle);
+	if (!handle)
+		return -ENOMEM;
+
+	handle->dev = dev;
+	handle->handler = handler;
+	handle->name = "asusec-media-handler";
+
+	error = input_register_handle(handle);
+	if (error)
+		goto err_free_handle;
+
+	error = input_open_device(handle);
+	if (error)
+		goto err_unregister_handle;
+
+	return 0;
+
+ err_unregister_handle:
+	input_unregister_handle(handle);
+ err_free_handle:
+	kfree(handle);
+
+	return error;
+}
+
+static void asus_ec_input_disconnect(struct input_handle *handle)
+{
+	input_close_device(handle);
+	input_unregister_handle(handle);
+	kfree(handle);
+}
+
+static const struct input_device_id asus_ec_input_ids[] = {
+	{
+		.flags = INPUT_DEVICE_ID_MATCH_EVBIT,
+		.evbit = { BIT_MASK(EV_KEY) },
+	},
+	{ }
+};
+
+static struct input_handler asus_ec_input_handler = {
+	.name =	"asusec-media-handler",
+	.event = asus_ec_input_event,
+	.connect = asus_ec_input_connect,
+	.disconnect = asus_ec_input_disconnect,
+	.id_table = asus_ec_input_ids,
+};
+
+static const unsigned short asus_ec_dock_ext_keys[] = {
+	/* Function keys [0x00 - 0x19] */
+	[0x01] = KEY_DELETE,
+	[0x02] = KEY_F1,
+	[0x03] = KEY_F2,
+	[0x04] = KEY_F3,
+	[0x05] = KEY_F4,
+	[0x06] = KEY_F5,
+	[0x07] = KEY_F6,
+	[0x08] = KEY_F7,
+	[0x10] = KEY_F8,
+	[0x11] = KEY_F9,
+	[0x12] = KEY_F10,
+	[0x13] = KEY_F11,
+	[0x14] = KEY_F12,
+	[0x15] = KEY_MUTE,
+	[0x16] = KEY_VOLUMEDOWN,
+	[0x17] = KEY_VOLUMEUP,
+	/* Multimedia keys [0x20 - 0x39] */
+	[0x21] = KEY_SCREENLOCK,
+	[0x22] = KEY_WLAN,
+	[0x23] = KEY_BLUETOOTH,
+	[0x24] = KEY_TOUCHPAD_TOGGLE,
+	[0x25] = KEY_BRIGHTNESSDOWN,
+	[0x26] = KEY_BRIGHTNESSUP,
+	[0x27] = KEY_BRIGHTNESS_AUTO,
+	[0x28] = KEY_PRINT,
+	[0x30] = KEY_WWW,
+	[0x31] = KEY_CONFIG,
+	[0x32] = KEY_PREVIOUSSONG,
+	[0x33] = KEY_PLAYPAUSE,
+	[0x34] = KEY_NEXTSONG,
+	[0x35] = KEY_MUTE,
+	[0x36] = KEY_VOLUMEDOWN,
+	[0x37] = KEY_VOLUMEUP,
+};
+
+static void asus_ec_keys_report_key(struct input_dev *dev, unsigned int code,
+				    unsigned int key, bool value)
+{
+	input_event(dev, EV_MSC, MSC_SCAN, code);
+	input_report_key(dev, key, value);
+	input_sync(dev);
+}
+
+static int asus_ec_keys_process_key(struct input_dev *dev, u8 code)
+{
+	struct asus_ec_keys_data *priv = dev_get_drvdata(dev->dev.parent);
+	unsigned int key = 0;
+
+	if (code == 0)
+		return NOTIFY_DONE;
+
+	/* Flip special key mode state when pressing key 1 with special key pressed */
+	if (priv->special_key_pressed && code == 1) {
+		priv->special_key_mode = !priv->special_key_mode;
+		return NOTIFY_DONE;
+	}
+
+	/*
+	 * Relocate code to second "page" if pressed state XOR's mode state
+	 * This way special key will invert the current mode
+	 */
+	if (priv->special_key_mode ^ priv->special_key_pressed)
+		code += ASUSEC_EXT_KEY_CODES;
+
+	if (code < dev->keycodemax) {
+		unsigned short *map = dev->keycode;
+
+		key = map[code];
+	}
+
+	if (!key)
+		key = KEY_UNKNOWN;
+
+	asus_ec_keys_report_key(dev, code, key, 1);
+	asus_ec_keys_report_key(dev, code, key, 0);
+
+	return NOTIFY_OK;
+}
+
+static int asus_ec_keys_notify(struct notifier_block *nb,
+			       unsigned long action, void *data_)
+{
+	struct asus_ec_keys_data *priv = container_of(nb, struct asus_ec_keys_data, nb);
+	u8 *data = data_;
+
+	if (action & ASUSEC_SMI_MASK)
+		return NOTIFY_DONE;
+
+	if (action & ASUSEC_SCI_MASK)
+		return asus_ec_keys_process_key(priv->xidev, data[2]);
+
+	return NOTIFY_DONE;
+}
+
+static void asus_ec_keys_setup_keymap(struct asus_ec_keys_data *priv)
+{
+	struct input_dev *dev = priv->xidev;
+	unsigned int i;
+
+	BUILD_BUG_ON(ARRAY_SIZE(priv->keymap) < ARRAY_SIZE(asus_ec_dock_ext_keys));
+
+	dev->keycode = priv->keymap;
+	dev->keycodesize = sizeof(*priv->keymap);
+	dev->keycodemax = ARRAY_SIZE(priv->keymap);
+
+	input_set_capability(dev, EV_MSC, MSC_SCAN);
+	input_set_capability(dev, EV_KEY, KEY_UNKNOWN);
+
+	for (i = 0; i < ARRAY_SIZE(asus_ec_dock_ext_keys); i++) {
+		unsigned int code = asus_ec_dock_ext_keys[i];
+
+		if (!code)
+			continue;
+
+		__set_bit(code, dev->keybit);
+		priv->keymap[i] = code;
+	}
+}
+
+static void asus_ec_input_handler_deregister(void *priv)
+{
+	input_unregister_handler(&asus_ec_input_handler);
+}
+
+static int asus_ec_keys_probe(struct platform_device *pdev)
+{
+	struct asusec_info *ec = cell_to_ec(pdev);
+	struct i2c_client *parent = to_i2c_client(pdev->dev.parent);
+	struct asus_ec_keys_data *priv;
+	int ret;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, priv);
+	priv->ec = ec;
+
+	priv->xidev = devm_input_allocate_device(&pdev->dev);
+	if (!priv->xidev)
+		return -ENOMEM;
+
+	priv->xidev->name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
+					   "%s Keyboard Ext", ec->model);
+	priv->xidev->phys = devm_kasprintf(&pdev->dev, GFP_KERNEL,
+					   "i2c-%u-%04x",
+					   i2c_adapter_id(parent->adapter),
+					   parent->addr);
+	asus_ec_keys_setup_keymap(priv);
+
+	ret = input_register_device(priv->xidev);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to register extension keys: %d\n",
+			ret);
+		return ret;
+	}
+
+	asus_ec_input_handler.private = priv;
+
+	ret = input_register_handler(&asus_ec_input_handler);
+	if (ret)
+		return ret;
+
+	ret = devm_add_action_or_reset(&pdev->dev, asus_ec_input_handler_deregister,
+				       priv);
+	if (ret)
+		return ret;
+
+	priv->nb.notifier_call = asus_ec_keys_notify;
+
+	return devm_asus_ec_register_notifier(pdev, &priv->nb);
+}
+
+static struct platform_driver asus_ec_keys_driver = {
+	.driver.name = "asus-transformer-ec-keys",
+	.probe = asus_ec_keys_probe,
+};
+module_platform_driver(asus_ec_keys_driver);
+
+MODULE_AUTHOR("Michał Mirosław <mirq-linux@rere.qmqm.pl>");
+MODULE_DESCRIPTION("ASUS Transformer's multimedia keys driver");
+MODULE_LICENSE("GPL");
-- 
2.51.0

[PATCH v5 5/7] leds: Add driver for ASUS Transformer LEDs

[Svyatoslav Ryhel]

From: Michał Mirosław <mirq-linux@rere.qmqm.pl>

ASUS Transformer tablets have a green and an amber LED on both the Pad
and the Dock. If both LEDs are enabled simultaneously, the emitted light
will be yellow.

Co-developed-by: Svyatoslav Ryhel <clamor95@gmail.com>
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
 drivers/leds/Kconfig                    | 11 ++++
 drivers/leds/Makefile                   |  1 +
 drivers/leds/leds-asus-transformer-ec.c | 79 +++++++++++++++++++++++++
 3 files changed, 91 insertions(+)
 create mode 100644 drivers/leds/leds-asus-transformer-ec.c

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 597d7a79c988..bda06dc145d7 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -120,6 +120,17 @@ config LEDS_OSRAM_AMS_AS3668
 	  To compile this driver as a module, choose M here: the module
 	  will be called leds-as3668.
 
+config LEDS_ASUS_TRANSFORMER_EC
+	tristate "LED Support for Asus Transformer charging LED"
+	depends on LEDS_CLASS
+	depends on MFD_ASUS_TRANSFORMER_EC
+	help
+	  This option enables support for charging indicator on
+	  Asus Transformer's Pad and it's Dock.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called leds-asus-transformer-ec.
+
 config LEDS_AW200XX
 	tristate "LED support for Awinic AW20036/AW20054/AW20072/AW20108"
 	depends on LEDS_CLASS
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 8fdb45d5b439..d5395c3f1124 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_LEDS_AN30259A)		+= leds-an30259a.o
 obj-$(CONFIG_LEDS_APU)			+= leds-apu.o
 obj-$(CONFIG_LEDS_ARIEL)		+= leds-ariel.o
 obj-$(CONFIG_LEDS_AS3668)		+= leds-as3668.o
+obj-$(CONFIG_LEDS_ASUS_TRANSFORMER_EC)	+= leds-asus-transformer-ec.o
 obj-$(CONFIG_LEDS_AW200XX)		+= leds-aw200xx.o
 obj-$(CONFIG_LEDS_AW2013)		+= leds-aw2013.o
 obj-$(CONFIG_LEDS_BCM6328)		+= leds-bcm6328.o
diff --git a/drivers/leds/leds-asus-transformer-ec.c b/drivers/leds/leds-asus-transformer-ec.c
new file mode 100644
index 000000000000..3186038e3be7
--- /dev/null
+++ b/drivers/leds/leds-asus-transformer-ec.c
@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/err.h>
+#include <linux/leds.h>
+#include <linux/mfd/asus-transformer-ec.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+static void asus_ec_led_set_brightness_amber(struct led_classdev *led,
+					     enum led_brightness brightness)
+{
+	const struct asusec_info *ec = dev_get_drvdata(led->dev->parent);
+
+	if (brightness)
+		asus_ec_set_ctl_bits(ec, ASUSEC_CTL_LED_AMBER);
+	else
+		asus_ec_clear_ctl_bits(ec, ASUSEC_CTL_LED_AMBER);
+}
+
+static void asus_ec_led_set_brightness_green(struct led_classdev *led,
+					     enum led_brightness brightness)
+{
+	const struct asusec_info *ec = dev_get_drvdata(led->dev->parent);
+
+	if (brightness)
+		asus_ec_set_ctl_bits(ec, ASUSEC_CTL_LED_GREEN);
+	else
+		asus_ec_clear_ctl_bits(ec, ASUSEC_CTL_LED_GREEN);
+}
+
+static int asus_ec_led_probe(struct platform_device *pdev)
+{
+	struct asusec_info *ec = cell_to_ec(pdev);
+	struct device *dev = &pdev->dev;
+	struct led_classdev *amber_led, *green_led;
+	int ret;
+
+	platform_set_drvdata(pdev, ec);
+
+	amber_led = devm_kzalloc(dev, sizeof(*amber_led), GFP_KERNEL);
+	if (!amber_led)
+		return -ENOMEM;
+
+	amber_led->name = devm_kasprintf(dev, GFP_KERNEL, "%s::amber", ec->name);
+	amber_led->max_brightness = 1;
+	amber_led->flags = LED_CORE_SUSPENDRESUME | LED_RETAIN_AT_SHUTDOWN;
+	amber_led->brightness_set = asus_ec_led_set_brightness_amber;
+
+	ret = devm_led_classdev_register(dev, amber_led);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to register amber LED\n");
+
+	green_led = devm_kzalloc(dev, sizeof(*green_led), GFP_KERNEL);
+	if (!green_led)
+		return -ENOMEM;
+
+	green_led->name = devm_kasprintf(dev, GFP_KERNEL, "%s::green", ec->name);
+	green_led->max_brightness = 1;
+	green_led->flags = LED_CORE_SUSPENDRESUME | LED_RETAIN_AT_SHUTDOWN;
+	green_led->brightness_set = asus_ec_led_set_brightness_green;
+
+	ret = devm_led_classdev_register(dev, green_led);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to register green LED\n");
+
+	return 0;
+}
+
+static struct platform_driver asus_ec_led_driver = {
+	.driver.name = "asus-transformer-ec-led",
+	.probe = asus_ec_led_probe,
+};
+module_platform_driver(asus_ec_led_driver);
+
+MODULE_AUTHOR("Michał Mirosław <mirq-linux@rere.qmqm.pl>");
+MODULE_AUTHOR("Svyatoslav Ryhel <clamor95@gmail.com>");
+MODULE_DESCRIPTION("ASUS Transformer's charging LED driver");
+MODULE_LICENSE("GPL");
-- 
2.51.0

[PATCH v5 6/7] power: supply: Add driver for ASUS Transformer battery

[Svyatoslav Ryhel]

From: Michał Mirosław <mirq-linux@rere.qmqm.pl>

Driver implements one battery cell per EC controller and supports reading
of battery status for ASUS Transformer's pad and mobile dock.

Co-developed-by: Svyatoslav Ryhel <clamor95@gmail.com>
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
 drivers/power/supply/Kconfig                  |  11 +
 drivers/power/supply/Makefile                 |   1 +
 .../supply/asus-transformer-ec-battery.c      | 272 ++++++++++++++++++
 3 files changed, 284 insertions(+)
 create mode 100644 drivers/power/supply/asus-transformer-ec-battery.c

diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index 81fadb0695a9..3c46b412632d 100644
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -122,6 +122,17 @@ config BATTERY_CHAGALL
 	  This driver can also be built as a module. If so, the module will be
 	  called chagall-battery.
 
+config BATTERY_ASUS_TRANSFORMER_EC
+	tristate "Asus Transformer's battery driver"
+	depends on MFD_ASUS_TRANSFORMER_EC
+	help
+	  Say Y here to enable support APM status emulation using
+	  battery class devices.
+
+	  This sub-driver supports battery cells found in Asus Transformer
+	  tablets and mobile docks and controlled by special embedded
+	  controller.
+
 config BATTERY_CPCAP
 	tristate "Motorola CPCAP PMIC battery driver"
 	depends on MFD_CPCAP && IIO
diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
index 41c400bbf022..aa5e6b05b018 100644
--- a/drivers/power/supply/Makefile
+++ b/drivers/power/supply/Makefile
@@ -22,6 +22,7 @@ obj-$(CONFIG_TEST_POWER)	+= test_power.o
 obj-$(CONFIG_BATTERY_88PM860X)	+= 88pm860x_battery.o
 obj-$(CONFIG_CHARGER_ADP5061)	+= adp5061.o
 obj-$(CONFIG_BATTERY_ACT8945A)	+= act8945a_charger.o
+obj-$(CONFIG_BATTERY_ASUS_TRANSFORMER_EC)	+= asus-transformer-ec-battery.o
 obj-$(CONFIG_BATTERY_AXP20X)	+= axp20x_battery.o
 obj-$(CONFIG_CHARGER_AXP20X)	+= axp20x_ac_power.o
 obj-$(CONFIG_BATTERY_CHAGALL)	+= chagall-battery.o
diff --git a/drivers/power/supply/asus-transformer-ec-battery.c b/drivers/power/supply/asus-transformer-ec-battery.c
new file mode 100644
index 000000000000..aefcd3fed6fe
--- /dev/null
+++ b/drivers/power/supply/asus-transformer-ec-battery.c
@@ -0,0 +1,272 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <linux/array_size.h>
+#include <linux/devm-helpers.h>
+#include <linux/err.h>
+#include <linux/mfd/asus-transformer-ec.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/property.h>
+#include <linux/unaligned.h>
+
+#define ASUSEC_BATTERY_DATA_FRESH_MSEC		5000
+
+#define ASUSEC_BATTERY_DISCHARGING		0x40
+#define ASUSEC_BATTERY_FULL_CHARGED		0x20
+#define ASUSEC_BATTERY_NOT_CHARGING		0x10
+
+#define TEMP_CELSIUS_OFFSET			2731
+
+struct asus_ec_battery_data {
+	const struct asusec_info *ec;
+	struct power_supply *battery;
+	struct power_supply_desc psy_desc;
+	struct delayed_work poll_work;
+	struct mutex battery_lock; /* for data refresh */
+	unsigned long batt_data_ts;
+	int last_state;
+	u8 batt_data[DOCKRAM_ENTRY_BUFSIZE];
+};
+
+static int asus_ec_battery_refresh(struct asus_ec_battery_data *priv)
+{
+	int ret = 0;
+
+	guard(mutex)(&priv->battery_lock);
+
+	if (time_before(jiffies, priv->batt_data_ts))
+		return ret;
+
+	ret = asus_dockram_read(priv->ec->dockram, ASUSEC_DOCKRAM_BATT_CTL,
+				priv->batt_data);
+	if (ret < 0)
+		return ret;
+
+	priv->batt_data_ts = jiffies +
+		msecs_to_jiffies(ASUSEC_BATTERY_DATA_FRESH_MSEC);
+
+	return ret;
+}
+
+static enum power_supply_property asus_ec_battery_properties[] = {
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_VOLTAGE_MAX,
+	POWER_SUPPLY_PROP_CURRENT_MAX,
+	POWER_SUPPLY_PROP_TEMP,
+	POWER_SUPPLY_PROP_VOLTAGE_NOW,
+	POWER_SUPPLY_PROP_CURRENT_NOW,
+	POWER_SUPPLY_PROP_CAPACITY,
+	POWER_SUPPLY_PROP_CHARGE_NOW,
+	POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
+	POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
+	POWER_SUPPLY_PROP_PRESENT,
+};
+
+static const unsigned int asus_ec_battery_prop_offs[] = {
+	[POWER_SUPPLY_PROP_STATUS] = 1,
+	[POWER_SUPPLY_PROP_VOLTAGE_MAX] = 3,
+	[POWER_SUPPLY_PROP_CURRENT_MAX] = 5,
+	[POWER_SUPPLY_PROP_TEMP] = 7,
+	[POWER_SUPPLY_PROP_VOLTAGE_NOW] = 9,
+	[POWER_SUPPLY_PROP_CURRENT_NOW] = 11,
+	[POWER_SUPPLY_PROP_CAPACITY] = 13,
+	[POWER_SUPPLY_PROP_CHARGE_NOW] = 15,
+	[POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW] = 17,
+	[POWER_SUPPLY_PROP_TIME_TO_FULL_NOW] = 19,
+};
+
+static int asus_ec_battery_get_value(struct asus_ec_battery_data *priv,
+				     enum power_supply_property psp)
+{
+	int ret, offs;
+
+	if (psp >= ARRAY_SIZE(asus_ec_battery_prop_offs))
+		return -EINVAL;
+
+	offs = asus_ec_battery_prop_offs[psp];
+	if (!offs)
+		return -EINVAL;
+
+	ret = asus_ec_battery_refresh(priv);
+	if (ret < 0)
+		return ret;
+
+	if (offs >= priv->batt_data[0])
+		return -ENODATA;
+
+	return get_unaligned_le16(priv->batt_data + offs);
+}
+
+static int asus_ec_battery_get_property(struct power_supply *psy,
+					enum power_supply_property psp,
+					union power_supply_propval *val)
+{
+	struct asus_ec_battery_data *priv = power_supply_get_drvdata(psy);
+	int ret;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_PRESENT:
+		val->intval = 1;
+		break;
+
+	default:
+		ret = asus_ec_battery_get_value(priv, psp);
+		if (ret < 0)
+			return ret;
+
+		val->intval = (s16)ret;
+
+		switch (psp) {
+		case POWER_SUPPLY_PROP_STATUS:
+			if (ret & ASUSEC_BATTERY_FULL_CHARGED)
+				val->intval = POWER_SUPPLY_STATUS_FULL;
+			else if (ret & ASUSEC_BATTERY_NOT_CHARGING)
+				val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+			else if (ret & ASUSEC_BATTERY_DISCHARGING)
+				val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+			else
+				val->intval = POWER_SUPPLY_STATUS_CHARGING;
+			break;
+
+		case POWER_SUPPLY_PROP_TEMP:
+			val->intval -= TEMP_CELSIUS_OFFSET;
+			break;
+
+		case POWER_SUPPLY_PROP_CHARGE_NOW:
+		case POWER_SUPPLY_PROP_CURRENT_NOW:
+		case POWER_SUPPLY_PROP_CURRENT_MAX:
+		case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+		case POWER_SUPPLY_PROP_VOLTAGE_MAX:
+			val->intval *= 1000;
+			break;
+
+		case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
+		case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
+			val->intval *= 60;
+			break;
+
+		default:
+			break;
+		}
+
+		break;
+	}
+
+	return 0;
+}
+
+static void asus_ec_battery_poll_work(struct work_struct *work)
+{
+	struct asus_ec_battery_data *priv =
+		container_of(work, struct asus_ec_battery_data, poll_work.work);
+	int state;
+
+	state = asus_ec_battery_get_value(priv, POWER_SUPPLY_PROP_STATUS);
+	if (state < 0)
+		return;
+
+	if (state & ASUSEC_BATTERY_FULL_CHARGED)
+		state = POWER_SUPPLY_STATUS_FULL;
+	else if (state & ASUSEC_BATTERY_DISCHARGING)
+		state = POWER_SUPPLY_STATUS_DISCHARGING;
+	else
+		state = POWER_SUPPLY_STATUS_CHARGING;
+
+	if (priv->last_state != state) {
+		priv->last_state = state;
+		power_supply_changed(priv->battery);
+	}
+
+	/* continuously send uevent notification */
+	schedule_delayed_work(&priv->poll_work,
+			      msecs_to_jiffies(ASUSEC_BATTERY_DATA_FRESH_MSEC));
+}
+
+static const struct power_supply_desc asus_ec_battery_desc = {
+	.name = "asus-ec-battery",
+	.type = POWER_SUPPLY_TYPE_BATTERY,
+	.properties = asus_ec_battery_properties,
+	.num_properties = ARRAY_SIZE(asus_ec_battery_properties),
+	.get_property = asus_ec_battery_get_property,
+	.external_power_changed = power_supply_changed,
+};
+
+static int asus_ec_battery_probe(struct platform_device *pdev)
+{
+	struct asus_ec_battery_data *priv;
+	struct device *dev = &pdev->dev;
+	struct power_supply_config cfg = { };
+	int ret;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, priv);
+
+	mutex_init(&priv->battery_lock);
+
+	priv->ec = cell_to_ec(pdev);
+	priv->batt_data_ts = jiffies - 1;
+	priv->last_state = POWER_SUPPLY_STATUS_UNKNOWN;
+
+	cfg.fwnode = dev_fwnode(dev->parent);
+	cfg.drv_data = priv;
+
+	memcpy(&priv->psy_desc, &asus_ec_battery_desc, sizeof(priv->psy_desc));
+	priv->psy_desc.name = devm_kasprintf(dev, GFP_KERNEL, "%s-battery",
+					     priv->ec->name);
+
+	priv->battery = devm_power_supply_register(dev, &priv->psy_desc, &cfg);
+	if (IS_ERR(priv->battery))
+		return dev_err_probe(dev, PTR_ERR(priv->battery),
+				     "Failed to register power supply\n");
+
+	ret = devm_delayed_work_autocancel(dev, &priv->poll_work,
+					   asus_ec_battery_poll_work);
+	if (ret)
+		return ret;
+
+	schedule_delayed_work(&priv->poll_work,
+			      msecs_to_jiffies(ASUSEC_BATTERY_DATA_FRESH_MSEC));
+
+	return 0;
+}
+
+static int __maybe_unused asus_ec_battery_suspend(struct device *dev)
+{
+	struct asus_ec_battery_data *priv = dev_get_drvdata(dev);
+
+	cancel_delayed_work_sync(&priv->poll_work);
+
+	return 0;
+}
+
+static int __maybe_unused asus_ec_battery_resume(struct device *dev)
+{
+	struct asus_ec_battery_data *priv = dev_get_drvdata(dev);
+
+	schedule_delayed_work(&priv->poll_work,
+			      msecs_to_jiffies(ASUSEC_BATTERY_DATA_FRESH_MSEC));
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(asus_ec_battery_pm_ops,
+			 asus_ec_battery_suspend, asus_ec_battery_resume);
+
+static struct platform_driver asus_ec_battery_driver = {
+	.driver = {
+		.name = "asus-transformer-ec-battery",
+		.pm = &asus_ec_battery_pm_ops,
+	},
+	.probe = asus_ec_battery_probe,
+};
+module_platform_driver(asus_ec_battery_driver);
+
+MODULE_AUTHOR("Michał Mirosław <mirq-linux@rere.qmqm.pl>");
+MODULE_AUTHOR("Svyatoslav Ryhel <clamor95@gmail.com>");
+MODULE_DESCRIPTION("ASUS Transformer's battery driver");
+MODULE_LICENSE("GPL");
-- 
2.51.0

[PATCH v5 7/7] power: supply: Add charger driver for Asus Transformers

[Svyatoslav Ryhel]

From: Michał Mirosław <mirq-linux@rere.qmqm.pl>

Add support for charger detection capabilities found in the embedded
controller of ASUS Transformer devices.

Suggested-by: Maxim Schwalm <maxim.schwalm@gmail.com>
Suggested-by: Svyatoslav Ryhel <clamor95@gmail.com>
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
---
 drivers/power/supply/Kconfig                  |  11 +
 drivers/power/supply/Makefile                 |   1 +
 .../supply/asus-transformer-ec-charger.c      | 193 ++++++++++++++++++
 3 files changed, 205 insertions(+)
 create mode 100644 drivers/power/supply/asus-transformer-ec-charger.c

diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index 3c46b412632d..56800aab82f9 100644
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -497,6 +497,17 @@ config CHARGER_88PM860X
 	help
 	  Say Y here to enable charger for Marvell 88PM860x chip.
 
+config CHARGER_ASUS_TRANSFORMER_EC
+	tristate "Asus Transformer's charger driver"
+	depends on MFD_ASUS_TRANSFORMER_EC
+	help
+	  Say Y here to enable support AC plug detection on Asus Transformer
+	  Dock.
+
+	  This sub-driver supports charger detection mechanism found in Asus
+	  Transformer tablets and mobile docks and controlled by special
+	  embedded controller.
+
 config CHARGER_PF1550
 	tristate "NXP PF1550 battery charger driver"
 	depends on MFD_PF1550
diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
index aa5e6b05b018..24679f09bb61 100644
--- a/drivers/power/supply/Makefile
+++ b/drivers/power/supply/Makefile
@@ -68,6 +68,7 @@ obj-$(CONFIG_CHARGER_RT9471)	+= rt9471.o
 obj-$(CONFIG_CHARGER_RT9756)	+= rt9756.o
 obj-$(CONFIG_BATTERY_TWL4030_MADC)	+= twl4030_madc_battery.o
 obj-$(CONFIG_CHARGER_88PM860X)	+= 88pm860x_charger.o
+obj-$(CONFIG_CHARGER_ASUS_TRANSFORMER_EC)	+= asus-transformer-ec-charger.o
 obj-$(CONFIG_CHARGER_PF1550)	+= pf1550-charger.o
 obj-$(CONFIG_BATTERY_RX51)	+= rx51_battery.o
 obj-$(CONFIG_AB8500_BM)		+= ab8500_bmdata.o ab8500_charger.o ab8500_fg.o ab8500_btemp.o ab8500_chargalg.o
diff --git a/drivers/power/supply/asus-transformer-ec-charger.c b/drivers/power/supply/asus-transformer-ec-charger.c
new file mode 100644
index 000000000000..de01f0bf2fd7
--- /dev/null
+++ b/drivers/power/supply/asus-transformer-ec-charger.c
@@ -0,0 +1,193 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <linux/err.h>
+#include <linux/mfd/asus-transformer-ec.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/property.h>
+
+struct asus_ec_charger_data {
+	struct notifier_block nb;
+	const struct asusec_info *ec;
+	struct power_supply *psy;
+	struct power_supply_desc psy_desc;
+};
+
+static enum power_supply_property asus_ec_charger_properties[] = {
+	POWER_SUPPLY_PROP_USB_TYPE,
+	POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR,
+	POWER_SUPPLY_PROP_ONLINE,
+	POWER_SUPPLY_PROP_MODEL_NAME,
+};
+
+static int asus_ec_charger_get_property(struct power_supply *psy,
+					enum power_supply_property psp,
+					union power_supply_propval *val)
+{
+	struct asus_ec_charger_data *priv = power_supply_get_drvdata(psy);
+	enum power_supply_usb_type psu;
+	int ret;
+	u64 ctl;
+
+	ret = asus_ec_get_ctl(priv->ec, &ctl);
+	if (ret)
+		return ret;
+
+	switch (ctl & (ASUSEC_CTL_FULL_POWER_SOURCE | ASUSEC_CTL_DIRECT_POWER_SOURCE)) {
+	case ASUSEC_CTL_FULL_POWER_SOURCE:
+		psu = POWER_SUPPLY_USB_TYPE_CDP;	/* DOCK */
+		break;
+	case ASUSEC_CTL_DIRECT_POWER_SOURCE:
+		psu = POWER_SUPPLY_USB_TYPE_SDP;	/* USB */
+		break;
+	case 0:
+		psu = POWER_SUPPLY_USB_TYPE_UNKNOWN;	/* no power source connected */
+		break;
+	default:
+		psu = POWER_SUPPLY_USB_TYPE_ACA;	/* power adapter */
+		break;
+	}
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_ONLINE:
+		val->intval = psu != POWER_SUPPLY_USB_TYPE_UNKNOWN;
+		return 0;
+
+	case POWER_SUPPLY_PROP_USB_TYPE:
+		val->intval = psu;
+		return 0;
+
+	case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR:
+		if (ctl & ASUSEC_CTL_TEST_DISCHARGE)
+			val->intval = POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE;
+		else if (ctl & ASUSEC_CTL_USB_CHARGE)
+			val->intval = POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO;
+		else
+			val->intval = POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE;
+		return 0;
+
+	case POWER_SUPPLY_PROP_MODEL_NAME:
+		val->strval = priv->ec->model;
+		return 0;
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static int asus_ec_charger_set_property(struct power_supply *psy,
+					enum power_supply_property psp,
+					const union power_supply_propval *val)
+{
+	struct asus_ec_charger_data *priv = power_supply_get_drvdata(psy);
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR:
+		switch ((enum power_supply_charge_behaviour)val->intval) {
+		case POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO:
+			return asus_ec_update_ctl(priv->ec,
+				ASUSEC_CTL_TEST_DISCHARGE | ASUSEC_CTL_USB_CHARGE,
+				ASUSEC_CTL_USB_CHARGE);
+
+		case POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE:
+			return asus_ec_clear_ctl_bits(priv->ec,
+				ASUSEC_CTL_TEST_DISCHARGE | ASUSEC_CTL_USB_CHARGE);
+
+		case POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE:
+			return asus_ec_update_ctl(priv->ec,
+				ASUSEC_CTL_TEST_DISCHARGE | ASUSEC_CTL_USB_CHARGE,
+				ASUSEC_CTL_TEST_DISCHARGE);
+		default:
+			return -EINVAL;
+		}
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static int asus_ec_charger_property_is_writeable(struct power_supply *psy,
+						 enum power_supply_property psp)
+{
+	switch (psp) {
+	case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static const struct power_supply_desc asus_ec_charger_desc = {
+	.name = "asus-ec-charger",
+	.type = POWER_SUPPLY_TYPE_USB,
+	.charge_behaviours = BIT(POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO) |
+			     BIT(POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE) |
+			     BIT(POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE),
+	.usb_types = BIT(POWER_SUPPLY_USB_TYPE_UNKNOWN) |
+		     BIT(POWER_SUPPLY_USB_TYPE_SDP) |
+		     BIT(POWER_SUPPLY_USB_TYPE_CDP) |
+		     BIT(POWER_SUPPLY_USB_TYPE_ACA),
+	.properties = asus_ec_charger_properties,
+	.num_properties = ARRAY_SIZE(asus_ec_charger_properties),
+	.get_property = asus_ec_charger_get_property,
+	.set_property = asus_ec_charger_set_property,
+	.property_is_writeable = asus_ec_charger_property_is_writeable,
+	.no_thermal = true,
+};
+
+static int asus_ec_charger_notify(struct notifier_block *nb,
+				  unsigned long action, void *data)
+{
+	struct asus_ec_charger_data *priv =
+		container_of(nb, struct asus_ec_charger_data, nb);
+
+	switch (action) {
+	case ASUSEC_SMI_ACTION(POWER_NOTIFY):
+	case ASUSEC_SMI_ACTION(ADAPTER_EVENT):
+		power_supply_changed(priv->psy);
+		break;
+	}
+
+	return NOTIFY_DONE;
+}
+
+static int asus_ec_charger_probe(struct platform_device *pdev)
+{
+	struct asus_ec_charger_data *priv;
+	struct device *dev = &pdev->dev;
+	struct power_supply_config cfg = { };
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, priv);
+	priv->ec = cell_to_ec(pdev);
+
+	cfg.fwnode = dev_fwnode(dev->parent);
+	cfg.drv_data = priv;
+
+	memcpy(&priv->psy_desc, &asus_ec_charger_desc, sizeof(priv->psy_desc));
+	priv->psy_desc.name = devm_kasprintf(dev, GFP_KERNEL, "%s-charger",
+					     priv->ec->name);
+
+	priv->psy = devm_power_supply_register(dev, &priv->psy_desc, &cfg);
+	if (IS_ERR(priv->psy))
+		return dev_err_probe(dev, PTR_ERR(priv->psy),
+				     "Failed to register power supply\n");
+
+	priv->nb.notifier_call = asus_ec_charger_notify;
+
+	return devm_asus_ec_register_notifier(pdev, &priv->nb);
+}
+
+static struct platform_driver asus_ec_charger_driver = {
+	.driver.name = "asus-transformer-ec-charger",
+	.probe = asus_ec_charger_probe,
+};
+module_platform_driver(asus_ec_charger_driver);
+
+MODULE_AUTHOR("Michał Mirosław <mirq-linux@rere.qmqm.pl>");
+MODULE_DESCRIPTION("ASUS Transformer Pad battery charger driver");
+MODULE_LICENSE("GPL");
-- 
2.51.0

Re: [PATCH v5 2/7] mfd: Add driver for ASUS Transformer embedded controller

[kernel test robot]

Hi Svyatoslav,

kernel test robot noticed the following build warnings:

[auto build test WARNING on sre-power-supply/for-next]
[also build test WARNING on robh/for-next linus/master v7.0-rc2 next-20260305]
[cannot apply to dtor-input/next dtor-input/for-linus]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Svyatoslav-Ryhel/dt-bindings-embedded-controller-document-ASUS-Transformer-EC/20260305-030907
base:   https://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply.git for-next
patch link:    https://lore.kernel.org/r/20260304185751.83494-3-clamor95%40gmail.com
patch subject: [PATCH v5 2/7] mfd: Add driver for ASUS Transformer embedded controller
config: powerpc64-randconfig-r133-20260305 (https://download.01.org/0day-ci/archive/20260307/202603070848.ib570eG8-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 9a109fbb6e184ec9bcce10615949f598f4c974a9)
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260307/202603070848.ib570eG8-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202603070848.ib570eG8-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/mfd/asus-transformer-ec.c:482:9: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void const * @@     got char const [noderef] __user *buf @@
   drivers/mfd/asus-transformer-ec.c:482:9: sparse:     expected void const *
   drivers/mfd/asus-transformer-ec.c:482:9: sparse:     got char const [noderef] __user *buf
>> drivers/mfd/asus-transformer-ec.c:482:9: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void const * @@     got char const [noderef] __user *buf @@
   drivers/mfd/asus-transformer-ec.c:482:9: sparse:     expected void const *
   drivers/mfd/asus-transformer-ec.c:482:9: sparse:     got char const [noderef] __user *buf
   drivers/mfd/asus-transformer-ec.c:482:9: sparse: sparse: incorrect type in argument 2 (different address spaces) @@     expected void const * @@     got char const [noderef] __user *buf @@
   drivers/mfd/asus-transformer-ec.c:482:9: sparse:     expected void const *
   drivers/mfd/asus-transformer-ec.c:482:9: sparse:     got char const [noderef] __user *buf
   drivers/mfd/asus-transformer-ec.c:476:16: sparse: sparse: dereference of noderef expression

vim +482 drivers/mfd/asus-transformer-ec.c

   467	
   468	static int dockram_write_one(struct i2c_client *client, int reg,
   469				     const char __user *buf, size_t count)
   470	{
   471		struct dockram_ec_data *priv = i2c_get_clientdata(client);
   472		int ret;
   473	
   474		if (!count || count > DOCKRAM_ENTRY_SIZE)
   475			return -EINVAL;
   476		if (buf[0] != count - 1)
   477			return -EINVAL;
   478	
   479		guard(mutex)(&priv->ctl_lock);
   480	
   481		priv->ctl_data[0] = (u8)count;
 > 482		memcpy(priv->ctl_data + 1, buf, count);
   483		ret = asus_dockram_write(client, reg, priv->ctl_data);
   484	
   485		return ret;
   486	}
   487	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Re: [PATCH v5 2/7] mfd: Add driver for ASUS Transformer embedded controller

[kernel test robot]

Hi Svyatoslav,

kernel test robot noticed the following build warnings:

[auto build test WARNING on sre-power-supply/for-next]
[also build test WARNING on robh/for-next linus/master v7.0-rc2 next-20260305]
[cannot apply to dtor-input/next dtor-input/for-linus]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Svyatoslav-Ryhel/dt-bindings-embedded-controller-document-ASUS-Transformer-EC/20260305-030907
base:   https://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply.git for-next
patch link:    https://lore.kernel.org/r/20260304185751.83494-3-clamor95%40gmail.com
patch subject: [PATCH v5 2/7] mfd: Add driver for ASUS Transformer embedded controller
config: openrisc-randconfig-r134-20260305 (https://download.01.org/0day-ci/archive/20260307/202603070925.iN0ySWQA-lkp@intel.com/config)
compiler: or1k-linux-gcc (GCC) 12.5.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260307/202603070925.iN0ySWQA-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202603070925.iN0ySWQA-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/mfd/asus-transformer-ec.c:482:36: sparse: sparse: incorrect type in argument 2 (different address spaces) @@     expected void const *src @@     got char const [noderef] __user *buf @@
   drivers/mfd/asus-transformer-ec.c:482:36: sparse:     expected void const *src
   drivers/mfd/asus-transformer-ec.c:482:36: sparse:     got char const [noderef] __user *buf
>> drivers/mfd/asus-transformer-ec.c:476:16: sparse: sparse: dereference of noderef expression

vim +482 drivers/mfd/asus-transformer-ec.c

   467	
   468	static int dockram_write_one(struct i2c_client *client, int reg,
   469				     const char __user *buf, size_t count)
   470	{
   471		struct dockram_ec_data *priv = i2c_get_clientdata(client);
   472		int ret;
   473	
   474		if (!count || count > DOCKRAM_ENTRY_SIZE)
   475			return -EINVAL;
 > 476		if (buf[0] != count - 1)
   477			return -EINVAL;
   478	
   479		guard(mutex)(&priv->ctl_lock);
   480	
   481		priv->ctl_data[0] = (u8)count;
 > 482		memcpy(priv->ctl_data + 1, buf, count);
   483		ret = asus_dockram_write(client, reg, priv->ctl_data);
   484	
   485		return ret;
   486	}
   487	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Re: [PATCH v5 6/7] power: supply: Add driver for ASUS Transformer battery

[Sebastian Reichel]

[-- Attachment #1: Type: text/plain, Size: 10929 bytes --]

Hi,

On Wed, Mar 04, 2026 at 08:57:50PM +0200, Svyatoslav Ryhel wrote:
> From: Michał Mirosław <mirq-linux@rere.qmqm.pl>
> 
> Driver implements one battery cell per EC controller and supports reading
> of battery status for ASUS Transformer's pad and mobile dock.
> 
> Co-developed-by: Svyatoslav Ryhel <clamor95@gmail.com>
> Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
> Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
> ---
>  drivers/power/supply/Kconfig                  |  11 +
>  drivers/power/supply/Makefile                 |   1 +
>  .../supply/asus-transformer-ec-battery.c      | 272 ++++++++++++++++++
>  3 files changed, 284 insertions(+)
>  create mode 100644 drivers/power/supply/asus-transformer-ec-battery.c
> 
> diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
> index 81fadb0695a9..3c46b412632d 100644
> --- a/drivers/power/supply/Kconfig
> +++ b/drivers/power/supply/Kconfig
> @@ -122,6 +122,17 @@ config BATTERY_CHAGALL
>  	  This driver can also be built as a module. If so, the module will be
>  	  called chagall-battery.
>  
> +config BATTERY_ASUS_TRANSFORMER_EC
> +	tristate "Asus Transformer's battery driver"
> +	depends on MFD_ASUS_TRANSFORMER_EC
> +	help
> +	  Say Y here to enable support APM status emulation using
> +	  battery class devices.

^^^

You forgot to drop that when you used the APM_POWER config entry as
template. Otherwise the driver LGTM:

Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>

Greetings,

-- Sebastian

> +	  This sub-driver supports battery cells found in Asus Transformer
> +	  tablets and mobile docks and controlled by special embedded
> +	  controller.
> +
>  config BATTERY_CPCAP
>  	tristate "Motorola CPCAP PMIC battery driver"
>  	depends on MFD_CPCAP && IIO
> diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
> index 41c400bbf022..aa5e6b05b018 100644
> --- a/drivers/power/supply/Makefile
> +++ b/drivers/power/supply/Makefile
> @@ -22,6 +22,7 @@ obj-$(CONFIG_TEST_POWER)	+= test_power.o
>  obj-$(CONFIG_BATTERY_88PM860X)	+= 88pm860x_battery.o
>  obj-$(CONFIG_CHARGER_ADP5061)	+= adp5061.o
>  obj-$(CONFIG_BATTERY_ACT8945A)	+= act8945a_charger.o
> +obj-$(CONFIG_BATTERY_ASUS_TRANSFORMER_EC)	+= asus-transformer-ec-battery.o
>  obj-$(CONFIG_BATTERY_AXP20X)	+= axp20x_battery.o
>  obj-$(CONFIG_CHARGER_AXP20X)	+= axp20x_ac_power.o
>  obj-$(CONFIG_BATTERY_CHAGALL)	+= chagall-battery.o
> diff --git a/drivers/power/supply/asus-transformer-ec-battery.c b/drivers/power/supply/asus-transformer-ec-battery.c
> new file mode 100644
> index 000000000000..aefcd3fed6fe
> --- /dev/null
> +++ b/drivers/power/supply/asus-transformer-ec-battery.c
> @@ -0,0 +1,272 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +
> +#include <linux/array_size.h>
> +#include <linux/devm-helpers.h>
> +#include <linux/err.h>
> +#include <linux/mfd/asus-transformer-ec.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/platform_device.h>
> +#include <linux/power_supply.h>
> +#include <linux/property.h>
> +#include <linux/unaligned.h>
> +
> +#define ASUSEC_BATTERY_DATA_FRESH_MSEC		5000
> +
> +#define ASUSEC_BATTERY_DISCHARGING		0x40
> +#define ASUSEC_BATTERY_FULL_CHARGED		0x20
> +#define ASUSEC_BATTERY_NOT_CHARGING		0x10
> +
> +#define TEMP_CELSIUS_OFFSET			2731
> +
> +struct asus_ec_battery_data {
> +	const struct asusec_info *ec;
> +	struct power_supply *battery;
> +	struct power_supply_desc psy_desc;
> +	struct delayed_work poll_work;
> +	struct mutex battery_lock; /* for data refresh */
> +	unsigned long batt_data_ts;
> +	int last_state;
> +	u8 batt_data[DOCKRAM_ENTRY_BUFSIZE];
> +};
> +
> +static int asus_ec_battery_refresh(struct asus_ec_battery_data *priv)
> +{
> +	int ret = 0;
> +
> +	guard(mutex)(&priv->battery_lock);
> +
> +	if (time_before(jiffies, priv->batt_data_ts))
> +		return ret;
> +
> +	ret = asus_dockram_read(priv->ec->dockram, ASUSEC_DOCKRAM_BATT_CTL,
> +				priv->batt_data);
> +	if (ret < 0)
> +		return ret;
> +
> +	priv->batt_data_ts = jiffies +
> +		msecs_to_jiffies(ASUSEC_BATTERY_DATA_FRESH_MSEC);
> +
> +	return ret;
> +}
> +
> +static enum power_supply_property asus_ec_battery_properties[] = {
> +	POWER_SUPPLY_PROP_STATUS,
> +	POWER_SUPPLY_PROP_VOLTAGE_MAX,
> +	POWER_SUPPLY_PROP_CURRENT_MAX,
> +	POWER_SUPPLY_PROP_TEMP,
> +	POWER_SUPPLY_PROP_VOLTAGE_NOW,
> +	POWER_SUPPLY_PROP_CURRENT_NOW,
> +	POWER_SUPPLY_PROP_CAPACITY,
> +	POWER_SUPPLY_PROP_CHARGE_NOW,
> +	POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
> +	POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
> +	POWER_SUPPLY_PROP_PRESENT,
> +};
> +
> +static const unsigned int asus_ec_battery_prop_offs[] = {
> +	[POWER_SUPPLY_PROP_STATUS] = 1,
> +	[POWER_SUPPLY_PROP_VOLTAGE_MAX] = 3,
> +	[POWER_SUPPLY_PROP_CURRENT_MAX] = 5,
> +	[POWER_SUPPLY_PROP_TEMP] = 7,
> +	[POWER_SUPPLY_PROP_VOLTAGE_NOW] = 9,
> +	[POWER_SUPPLY_PROP_CURRENT_NOW] = 11,
> +	[POWER_SUPPLY_PROP_CAPACITY] = 13,
> +	[POWER_SUPPLY_PROP_CHARGE_NOW] = 15,
> +	[POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW] = 17,
> +	[POWER_SUPPLY_PROP_TIME_TO_FULL_NOW] = 19,
> +};
> +
> +static int asus_ec_battery_get_value(struct asus_ec_battery_data *priv,
> +				     enum power_supply_property psp)
> +{
> +	int ret, offs;
> +
> +	if (psp >= ARRAY_SIZE(asus_ec_battery_prop_offs))
> +		return -EINVAL;
> +
> +	offs = asus_ec_battery_prop_offs[psp];
> +	if (!offs)
> +		return -EINVAL;
> +
> +	ret = asus_ec_battery_refresh(priv);
> +	if (ret < 0)
> +		return ret;
> +
> +	if (offs >= priv->batt_data[0])
> +		return -ENODATA;
> +
> +	return get_unaligned_le16(priv->batt_data + offs);
> +}
> +
> +static int asus_ec_battery_get_property(struct power_supply *psy,
> +					enum power_supply_property psp,
> +					union power_supply_propval *val)
> +{
> +	struct asus_ec_battery_data *priv = power_supply_get_drvdata(psy);
> +	int ret;
> +
> +	switch (psp) {
> +	case POWER_SUPPLY_PROP_PRESENT:
> +		val->intval = 1;
> +		break;
> +
> +	default:
> +		ret = asus_ec_battery_get_value(priv, psp);
> +		if (ret < 0)
> +			return ret;
> +
> +		val->intval = (s16)ret;
> +
> +		switch (psp) {
> +		case POWER_SUPPLY_PROP_STATUS:
> +			if (ret & ASUSEC_BATTERY_FULL_CHARGED)
> +				val->intval = POWER_SUPPLY_STATUS_FULL;
> +			else if (ret & ASUSEC_BATTERY_NOT_CHARGING)
> +				val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
> +			else if (ret & ASUSEC_BATTERY_DISCHARGING)
> +				val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
> +			else
> +				val->intval = POWER_SUPPLY_STATUS_CHARGING;
> +			break;
> +
> +		case POWER_SUPPLY_PROP_TEMP:
> +			val->intval -= TEMP_CELSIUS_OFFSET;
> +			break;
> +
> +		case POWER_SUPPLY_PROP_CHARGE_NOW:
> +		case POWER_SUPPLY_PROP_CURRENT_NOW:
> +		case POWER_SUPPLY_PROP_CURRENT_MAX:
> +		case POWER_SUPPLY_PROP_VOLTAGE_NOW:
> +		case POWER_SUPPLY_PROP_VOLTAGE_MAX:
> +			val->intval *= 1000;
> +			break;
> +
> +		case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
> +		case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
> +			val->intval *= 60;
> +			break;
> +
> +		default:
> +			break;
> +		}
> +
> +		break;
> +	}
> +
> +	return 0;
> +}
> +
> +static void asus_ec_battery_poll_work(struct work_struct *work)
> +{
> +	struct asus_ec_battery_data *priv =
> +		container_of(work, struct asus_ec_battery_data, poll_work.work);
> +	int state;
> +
> +	state = asus_ec_battery_get_value(priv, POWER_SUPPLY_PROP_STATUS);
> +	if (state < 0)
> +		return;
> +
> +	if (state & ASUSEC_BATTERY_FULL_CHARGED)
> +		state = POWER_SUPPLY_STATUS_FULL;
> +	else if (state & ASUSEC_BATTERY_DISCHARGING)
> +		state = POWER_SUPPLY_STATUS_DISCHARGING;
> +	else
> +		state = POWER_SUPPLY_STATUS_CHARGING;
> +
> +	if (priv->last_state != state) {
> +		priv->last_state = state;
> +		power_supply_changed(priv->battery);
> +	}
> +
> +	/* continuously send uevent notification */
> +	schedule_delayed_work(&priv->poll_work,
> +			      msecs_to_jiffies(ASUSEC_BATTERY_DATA_FRESH_MSEC));
> +}
> +
> +static const struct power_supply_desc asus_ec_battery_desc = {
> +	.name = "asus-ec-battery",
> +	.type = POWER_SUPPLY_TYPE_BATTERY,
> +	.properties = asus_ec_battery_properties,
> +	.num_properties = ARRAY_SIZE(asus_ec_battery_properties),
> +	.get_property = asus_ec_battery_get_property,
> +	.external_power_changed = power_supply_changed,
> +};
> +
> +static int asus_ec_battery_probe(struct platform_device *pdev)
> +{
> +	struct asus_ec_battery_data *priv;
> +	struct device *dev = &pdev->dev;
> +	struct power_supply_config cfg = { };
> +	int ret;
> +
> +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	platform_set_drvdata(pdev, priv);
> +
> +	mutex_init(&priv->battery_lock);
> +
> +	priv->ec = cell_to_ec(pdev);
> +	priv->batt_data_ts = jiffies - 1;
> +	priv->last_state = POWER_SUPPLY_STATUS_UNKNOWN;
> +
> +	cfg.fwnode = dev_fwnode(dev->parent);
> +	cfg.drv_data = priv;
> +
> +	memcpy(&priv->psy_desc, &asus_ec_battery_desc, sizeof(priv->psy_desc));
> +	priv->psy_desc.name = devm_kasprintf(dev, GFP_KERNEL, "%s-battery",
> +					     priv->ec->name);
> +
> +	priv->battery = devm_power_supply_register(dev, &priv->psy_desc, &cfg);
> +	if (IS_ERR(priv->battery))
> +		return dev_err_probe(dev, PTR_ERR(priv->battery),
> +				     "Failed to register power supply\n");
> +
> +	ret = devm_delayed_work_autocancel(dev, &priv->poll_work,
> +					   asus_ec_battery_poll_work);
> +	if (ret)
> +		return ret;
> +
> +	schedule_delayed_work(&priv->poll_work,
> +			      msecs_to_jiffies(ASUSEC_BATTERY_DATA_FRESH_MSEC));
> +
> +	return 0;
> +}
> +
> +static int __maybe_unused asus_ec_battery_suspend(struct device *dev)
> +{
> +	struct asus_ec_battery_data *priv = dev_get_drvdata(dev);
> +
> +	cancel_delayed_work_sync(&priv->poll_work);
> +
> +	return 0;
> +}
> +
> +static int __maybe_unused asus_ec_battery_resume(struct device *dev)
> +{
> +	struct asus_ec_battery_data *priv = dev_get_drvdata(dev);
> +
> +	schedule_delayed_work(&priv->poll_work,
> +			      msecs_to_jiffies(ASUSEC_BATTERY_DATA_FRESH_MSEC));
> +
> +	return 0;
> +}
> +
> +static SIMPLE_DEV_PM_OPS(asus_ec_battery_pm_ops,
> +			 asus_ec_battery_suspend, asus_ec_battery_resume);
> +
> +static struct platform_driver asus_ec_battery_driver = {
> +	.driver = {
> +		.name = "asus-transformer-ec-battery",
> +		.pm = &asus_ec_battery_pm_ops,
> +	},
> +	.probe = asus_ec_battery_probe,
> +};
> +module_platform_driver(asus_ec_battery_driver);
> +
> +MODULE_AUTHOR("Michał Mirosław <mirq-linux@rere.qmqm.pl>");
> +MODULE_AUTHOR("Svyatoslav Ryhel <clamor95@gmail.com>");
> +MODULE_DESCRIPTION("ASUS Transformer's battery driver");
> +MODULE_LICENSE("GPL");
> -- 
> 2.51.0
> 
> 

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Re: [PATCH v5 7/7] power: supply: Add charger driver for Asus Transformers

[Sebastian Reichel]

[-- Attachment #1: Type: text/plain, Size: 8925 bytes --]

Hi,

On Wed, Mar 04, 2026 at 08:57:51PM +0200, Svyatoslav Ryhel wrote:
> From: Michał Mirosław <mirq-linux@rere.qmqm.pl>
> 
> Add support for charger detection capabilities found in the embedded
> controller of ASUS Transformer devices.
> 
> Suggested-by: Maxim Schwalm <maxim.schwalm@gmail.com>
> Suggested-by: Svyatoslav Ryhel <clamor95@gmail.com>
> Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
> Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
> ---

Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>

-- Sebastian

>  drivers/power/supply/Kconfig                  |  11 +
>  drivers/power/supply/Makefile                 |   1 +
>  .../supply/asus-transformer-ec-charger.c      | 193 ++++++++++++++++++
>  3 files changed, 205 insertions(+)
>  create mode 100644 drivers/power/supply/asus-transformer-ec-charger.c
> 
> diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
> index 3c46b412632d..56800aab82f9 100644
> --- a/drivers/power/supply/Kconfig
> +++ b/drivers/power/supply/Kconfig
> @@ -497,6 +497,17 @@ config CHARGER_88PM860X
>  	help
>  	  Say Y here to enable charger for Marvell 88PM860x chip.
>  
> +config CHARGER_ASUS_TRANSFORMER_EC
> +	tristate "Asus Transformer's charger driver"
> +	depends on MFD_ASUS_TRANSFORMER_EC
> +	help
> +	  Say Y here to enable support AC plug detection on Asus Transformer
> +	  Dock.
> +
> +	  This sub-driver supports charger detection mechanism found in Asus
> +	  Transformer tablets and mobile docks and controlled by special
> +	  embedded controller.
> +
>  config CHARGER_PF1550
>  	tristate "NXP PF1550 battery charger driver"
>  	depends on MFD_PF1550
> diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
> index aa5e6b05b018..24679f09bb61 100644
> --- a/drivers/power/supply/Makefile
> +++ b/drivers/power/supply/Makefile
> @@ -68,6 +68,7 @@ obj-$(CONFIG_CHARGER_RT9471)	+= rt9471.o
>  obj-$(CONFIG_CHARGER_RT9756)	+= rt9756.o
>  obj-$(CONFIG_BATTERY_TWL4030_MADC)	+= twl4030_madc_battery.o
>  obj-$(CONFIG_CHARGER_88PM860X)	+= 88pm860x_charger.o
> +obj-$(CONFIG_CHARGER_ASUS_TRANSFORMER_EC)	+= asus-transformer-ec-charger.o
>  obj-$(CONFIG_CHARGER_PF1550)	+= pf1550-charger.o
>  obj-$(CONFIG_BATTERY_RX51)	+= rx51_battery.o
>  obj-$(CONFIG_AB8500_BM)		+= ab8500_bmdata.o ab8500_charger.o ab8500_fg.o ab8500_btemp.o ab8500_chargalg.o
> diff --git a/drivers/power/supply/asus-transformer-ec-charger.c b/drivers/power/supply/asus-transformer-ec-charger.c
> new file mode 100644
> index 000000000000..de01f0bf2fd7
> --- /dev/null
> +++ b/drivers/power/supply/asus-transformer-ec-charger.c
> @@ -0,0 +1,193 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +
> +#include <linux/err.h>
> +#include <linux/mfd/asus-transformer-ec.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/power_supply.h>
> +#include <linux/property.h>
> +
> +struct asus_ec_charger_data {
> +	struct notifier_block nb;
> +	const struct asusec_info *ec;
> +	struct power_supply *psy;
> +	struct power_supply_desc psy_desc;
> +};
> +
> +static enum power_supply_property asus_ec_charger_properties[] = {
> +	POWER_SUPPLY_PROP_USB_TYPE,
> +	POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR,
> +	POWER_SUPPLY_PROP_ONLINE,
> +	POWER_SUPPLY_PROP_MODEL_NAME,
> +};
> +
> +static int asus_ec_charger_get_property(struct power_supply *psy,
> +					enum power_supply_property psp,
> +					union power_supply_propval *val)
> +{
> +	struct asus_ec_charger_data *priv = power_supply_get_drvdata(psy);
> +	enum power_supply_usb_type psu;
> +	int ret;
> +	u64 ctl;
> +
> +	ret = asus_ec_get_ctl(priv->ec, &ctl);
> +	if (ret)
> +		return ret;
> +
> +	switch (ctl & (ASUSEC_CTL_FULL_POWER_SOURCE | ASUSEC_CTL_DIRECT_POWER_SOURCE)) {
> +	case ASUSEC_CTL_FULL_POWER_SOURCE:
> +		psu = POWER_SUPPLY_USB_TYPE_CDP;	/* DOCK */
> +		break;
> +	case ASUSEC_CTL_DIRECT_POWER_SOURCE:
> +		psu = POWER_SUPPLY_USB_TYPE_SDP;	/* USB */
> +		break;
> +	case 0:
> +		psu = POWER_SUPPLY_USB_TYPE_UNKNOWN;	/* no power source connected */
> +		break;
> +	default:
> +		psu = POWER_SUPPLY_USB_TYPE_ACA;	/* power adapter */
> +		break;
> +	}
> +
> +	switch (psp) {
> +	case POWER_SUPPLY_PROP_ONLINE:
> +		val->intval = psu != POWER_SUPPLY_USB_TYPE_UNKNOWN;
> +		return 0;
> +
> +	case POWER_SUPPLY_PROP_USB_TYPE:
> +		val->intval = psu;
> +		return 0;
> +
> +	case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR:
> +		if (ctl & ASUSEC_CTL_TEST_DISCHARGE)
> +			val->intval = POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE;
> +		else if (ctl & ASUSEC_CTL_USB_CHARGE)
> +			val->intval = POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO;
> +		else
> +			val->intval = POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE;
> +		return 0;
> +
> +	case POWER_SUPPLY_PROP_MODEL_NAME:
> +		val->strval = priv->ec->model;
> +		return 0;
> +
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
> +static int asus_ec_charger_set_property(struct power_supply *psy,
> +					enum power_supply_property psp,
> +					const union power_supply_propval *val)
> +{
> +	struct asus_ec_charger_data *priv = power_supply_get_drvdata(psy);
> +
> +	switch (psp) {
> +	case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR:
> +		switch ((enum power_supply_charge_behaviour)val->intval) {
> +		case POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO:
> +			return asus_ec_update_ctl(priv->ec,
> +				ASUSEC_CTL_TEST_DISCHARGE | ASUSEC_CTL_USB_CHARGE,
> +				ASUSEC_CTL_USB_CHARGE);
> +
> +		case POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE:
> +			return asus_ec_clear_ctl_bits(priv->ec,
> +				ASUSEC_CTL_TEST_DISCHARGE | ASUSEC_CTL_USB_CHARGE);
> +
> +		case POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE:
> +			return asus_ec_update_ctl(priv->ec,
> +				ASUSEC_CTL_TEST_DISCHARGE | ASUSEC_CTL_USB_CHARGE,
> +				ASUSEC_CTL_TEST_DISCHARGE);
> +		default:
> +			return -EINVAL;
> +		}
> +
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
> +static int asus_ec_charger_property_is_writeable(struct power_supply *psy,
> +						 enum power_supply_property psp)
> +{
> +	switch (psp) {
> +	case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR:
> +		return true;
> +	default:
> +		return false;
> +	}
> +}
> +
> +static const struct power_supply_desc asus_ec_charger_desc = {
> +	.name = "asus-ec-charger",
> +	.type = POWER_SUPPLY_TYPE_USB,
> +	.charge_behaviours = BIT(POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO) |
> +			     BIT(POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE) |
> +			     BIT(POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE),
> +	.usb_types = BIT(POWER_SUPPLY_USB_TYPE_UNKNOWN) |
> +		     BIT(POWER_SUPPLY_USB_TYPE_SDP) |
> +		     BIT(POWER_SUPPLY_USB_TYPE_CDP) |
> +		     BIT(POWER_SUPPLY_USB_TYPE_ACA),
> +	.properties = asus_ec_charger_properties,
> +	.num_properties = ARRAY_SIZE(asus_ec_charger_properties),
> +	.get_property = asus_ec_charger_get_property,
> +	.set_property = asus_ec_charger_set_property,
> +	.property_is_writeable = asus_ec_charger_property_is_writeable,
> +	.no_thermal = true,
> +};
> +
> +static int asus_ec_charger_notify(struct notifier_block *nb,
> +				  unsigned long action, void *data)
> +{
> +	struct asus_ec_charger_data *priv =
> +		container_of(nb, struct asus_ec_charger_data, nb);
> +
> +	switch (action) {
> +	case ASUSEC_SMI_ACTION(POWER_NOTIFY):
> +	case ASUSEC_SMI_ACTION(ADAPTER_EVENT):
> +		power_supply_changed(priv->psy);
> +		break;
> +	}
> +
> +	return NOTIFY_DONE;
> +}
> +
> +static int asus_ec_charger_probe(struct platform_device *pdev)
> +{
> +	struct asus_ec_charger_data *priv;
> +	struct device *dev = &pdev->dev;
> +	struct power_supply_config cfg = { };
> +
> +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	platform_set_drvdata(pdev, priv);
> +	priv->ec = cell_to_ec(pdev);
> +
> +	cfg.fwnode = dev_fwnode(dev->parent);
> +	cfg.drv_data = priv;
> +
> +	memcpy(&priv->psy_desc, &asus_ec_charger_desc, sizeof(priv->psy_desc));
> +	priv->psy_desc.name = devm_kasprintf(dev, GFP_KERNEL, "%s-charger",
> +					     priv->ec->name);
> +
> +	priv->psy = devm_power_supply_register(dev, &priv->psy_desc, &cfg);
> +	if (IS_ERR(priv->psy))
> +		return dev_err_probe(dev, PTR_ERR(priv->psy),
> +				     "Failed to register power supply\n");
> +
> +	priv->nb.notifier_call = asus_ec_charger_notify;
> +
> +	return devm_asus_ec_register_notifier(pdev, &priv->nb);
> +}
> +
> +static struct platform_driver asus_ec_charger_driver = {
> +	.driver.name = "asus-transformer-ec-charger",
> +	.probe = asus_ec_charger_probe,
> +};
> +module_platform_driver(asus_ec_charger_driver);
> +
> +MODULE_AUTHOR("Michał Mirosław <mirq-linux@rere.qmqm.pl>");
> +MODULE_DESCRIPTION("ASUS Transformer Pad battery charger driver");
> +MODULE_LICENSE("GPL");
> -- 
> 2.51.0
> 
> 

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Re: [PATCH v5 6/7] power: supply: Add driver for ASUS Transformer battery

[Svyatoslav Ryhel]

ср, 11 бер. 2026 р. о 08:31 Sebastian Reichel
<sebastian.reichel@collabora.com> пише:
>
> Hi,
>
> On Wed, Mar 04, 2026 at 08:57:50PM +0200, Svyatoslav Ryhel wrote:
> > From: Michał Mirosław <mirq-linux@rere.qmqm.pl>
> >
> > Driver implements one battery cell per EC controller and supports reading
> > of battery status for ASUS Transformer's pad and mobile dock.
> >
> > Co-developed-by: Svyatoslav Ryhel <clamor95@gmail.com>
> > Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
> > Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
> > ---
> >  drivers/power/supply/Kconfig                  |  11 +
> >  drivers/power/supply/Makefile                 |   1 +
> >  .../supply/asus-transformer-ec-battery.c      | 272 ++++++++++++++++++
> >  3 files changed, 284 insertions(+)
> >  create mode 100644 drivers/power/supply/asus-transformer-ec-battery.c
> >
> > diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
> > index 81fadb0695a9..3c46b412632d 100644
> > --- a/drivers/power/supply/Kconfig
> > +++ b/drivers/power/supply/Kconfig
> > @@ -122,6 +122,17 @@ config BATTERY_CHAGALL
> >         This driver can also be built as a module. If so, the module will be
> >         called chagall-battery.
> >
> > +config BATTERY_ASUS_TRANSFORMER_EC
> > +     tristate "Asus Transformer's battery driver"
> > +     depends on MFD_ASUS_TRANSFORMER_EC
> > +     help
> > +       Say Y here to enable support APM status emulation using
> > +       battery class devices.
>
> ^^^
>
> You forgot to drop that when you used the APM_POWER config entry as
> template. Otherwise the driver LGTM:
>

Oh, my bad. I will adjust in the next iteration. Thank you catching this.

> Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
>
> Greetings,
>
> -- Sebastian
>
> > +       This sub-driver supports battery cells found in Asus Transformer
> > +       tablets and mobile docks and controlled by special embedded
> > +       controller.
> > +
> >  config BATTERY_CPCAP
> >       tristate "Motorola CPCAP PMIC battery driver"
> >       depends on MFD_CPCAP && IIO
> > diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
> > index 41c400bbf022..aa5e6b05b018 100644
> > --- a/drivers/power/supply/Makefile
> > +++ b/drivers/power/supply/Makefile
> > @@ -22,6 +22,7 @@ obj-$(CONFIG_TEST_POWER)    += test_power.o
> >  obj-$(CONFIG_BATTERY_88PM860X)       += 88pm860x_battery.o
> >  obj-$(CONFIG_CHARGER_ADP5061)        += adp5061.o
> >  obj-$(CONFIG_BATTERY_ACT8945A)       += act8945a_charger.o
> > +obj-$(CONFIG_BATTERY_ASUS_TRANSFORMER_EC)    += asus-transformer-ec-battery.o
> >  obj-$(CONFIG_BATTERY_AXP20X) += axp20x_battery.o
> >  obj-$(CONFIG_CHARGER_AXP20X) += axp20x_ac_power.o
> >  obj-$(CONFIG_BATTERY_CHAGALL)        += chagall-battery.o
> > diff --git a/drivers/power/supply/asus-transformer-ec-battery.c b/drivers/power/supply/asus-transformer-ec-battery.c
> > new file mode 100644
> > index 000000000000..aefcd3fed6fe
> > --- /dev/null
> > +++ b/drivers/power/supply/asus-transformer-ec-battery.c
> > @@ -0,0 +1,272 @@
> > +// SPDX-License-Identifier: GPL-2.0-or-later
> > +
> > +#include <linux/array_size.h>
> > +#include <linux/devm-helpers.h>
> > +#include <linux/err.h>
> > +#include <linux/mfd/asus-transformer-ec.h>
> > +#include <linux/module.h>
> > +#include <linux/mutex.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/power_supply.h>
> > +#include <linux/property.h>
> > +#include <linux/unaligned.h>
> > +
> > +#define ASUSEC_BATTERY_DATA_FRESH_MSEC               5000
> > +
> > +#define ASUSEC_BATTERY_DISCHARGING           0x40
> > +#define ASUSEC_BATTERY_FULL_CHARGED          0x20
> > +#define ASUSEC_BATTERY_NOT_CHARGING          0x10
> > +
> > +#define TEMP_CELSIUS_OFFSET                  2731
> > +
> > +struct asus_ec_battery_data {
> > +     const struct asusec_info *ec;
> > +     struct power_supply *battery;
> > +     struct power_supply_desc psy_desc;
> > +     struct delayed_work poll_work;
> > +     struct mutex battery_lock; /* for data refresh */
> > +     unsigned long batt_data_ts;
> > +     int last_state;
> > +     u8 batt_data[DOCKRAM_ENTRY_BUFSIZE];
> > +};
> > +
> > +static int asus_ec_battery_refresh(struct asus_ec_battery_data *priv)
> > +{
> > +     int ret = 0;
> > +
> > +     guard(mutex)(&priv->battery_lock);
> > +
> > +     if (time_before(jiffies, priv->batt_data_ts))
> > +             return ret;
> > +
> > +     ret = asus_dockram_read(priv->ec->dockram, ASUSEC_DOCKRAM_BATT_CTL,
> > +                             priv->batt_data);
> > +     if (ret < 0)
> > +             return ret;
> > +
> > +     priv->batt_data_ts = jiffies +
> > +             msecs_to_jiffies(ASUSEC_BATTERY_DATA_FRESH_MSEC);
> > +
> > +     return ret;
> > +}
> > +
> > +static enum power_supply_property asus_ec_battery_properties[] = {
> > +     POWER_SUPPLY_PROP_STATUS,
> > +     POWER_SUPPLY_PROP_VOLTAGE_MAX,
> > +     POWER_SUPPLY_PROP_CURRENT_MAX,
> > +     POWER_SUPPLY_PROP_TEMP,
> > +     POWER_SUPPLY_PROP_VOLTAGE_NOW,
> > +     POWER_SUPPLY_PROP_CURRENT_NOW,
> > +     POWER_SUPPLY_PROP_CAPACITY,
> > +     POWER_SUPPLY_PROP_CHARGE_NOW,
> > +     POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
> > +     POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
> > +     POWER_SUPPLY_PROP_PRESENT,
> > +};
> > +
> > +static const unsigned int asus_ec_battery_prop_offs[] = {
> > +     [POWER_SUPPLY_PROP_STATUS] = 1,
> > +     [POWER_SUPPLY_PROP_VOLTAGE_MAX] = 3,
> > +     [POWER_SUPPLY_PROP_CURRENT_MAX] = 5,
> > +     [POWER_SUPPLY_PROP_TEMP] = 7,
> > +     [POWER_SUPPLY_PROP_VOLTAGE_NOW] = 9,
> > +     [POWER_SUPPLY_PROP_CURRENT_NOW] = 11,
> > +     [POWER_SUPPLY_PROP_CAPACITY] = 13,
> > +     [POWER_SUPPLY_PROP_CHARGE_NOW] = 15,
> > +     [POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW] = 17,
> > +     [POWER_SUPPLY_PROP_TIME_TO_FULL_NOW] = 19,
> > +};
> > +
> > +static int asus_ec_battery_get_value(struct asus_ec_battery_data *priv,
> > +                                  enum power_supply_property psp)
> > +{
> > +     int ret, offs;
> > +
> > +     if (psp >= ARRAY_SIZE(asus_ec_battery_prop_offs))
> > +             return -EINVAL;
> > +
> > +     offs = asus_ec_battery_prop_offs[psp];
> > +     if (!offs)
> > +             return -EINVAL;
> > +
> > +     ret = asus_ec_battery_refresh(priv);
> > +     if (ret < 0)
> > +             return ret;
> > +
> > +     if (offs >= priv->batt_data[0])
> > +             return -ENODATA;
> > +
> > +     return get_unaligned_le16(priv->batt_data + offs);
> > +}
> > +
> > +static int asus_ec_battery_get_property(struct power_supply *psy,
> > +                                     enum power_supply_property psp,
> > +                                     union power_supply_propval *val)
> > +{
> > +     struct asus_ec_battery_data *priv = power_supply_get_drvdata(psy);
> > +     int ret;
> > +
> > +     switch (psp) {
> > +     case POWER_SUPPLY_PROP_PRESENT:
> > +             val->intval = 1;
> > +             break;
> > +
> > +     default:
> > +             ret = asus_ec_battery_get_value(priv, psp);
> > +             if (ret < 0)
> > +                     return ret;
> > +
> > +             val->intval = (s16)ret;
> > +
> > +             switch (psp) {
> > +             case POWER_SUPPLY_PROP_STATUS:
> > +                     if (ret & ASUSEC_BATTERY_FULL_CHARGED)
> > +                             val->intval = POWER_SUPPLY_STATUS_FULL;
> > +                     else if (ret & ASUSEC_BATTERY_NOT_CHARGING)
> > +                             val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
> > +                     else if (ret & ASUSEC_BATTERY_DISCHARGING)
> > +                             val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
> > +                     else
> > +                             val->intval = POWER_SUPPLY_STATUS_CHARGING;
> > +                     break;
> > +
> > +             case POWER_SUPPLY_PROP_TEMP:
> > +                     val->intval -= TEMP_CELSIUS_OFFSET;
> > +                     break;
> > +
> > +             case POWER_SUPPLY_PROP_CHARGE_NOW:
> > +             case POWER_SUPPLY_PROP_CURRENT_NOW:
> > +             case POWER_SUPPLY_PROP_CURRENT_MAX:
> > +             case POWER_SUPPLY_PROP_VOLTAGE_NOW:
> > +             case POWER_SUPPLY_PROP_VOLTAGE_MAX:
> > +                     val->intval *= 1000;
> > +                     break;
> > +
> > +             case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
> > +             case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
> > +                     val->intval *= 60;
> > +                     break;
> > +
> > +             default:
> > +                     break;
> > +             }
> > +
> > +             break;
> > +     }
> > +
> > +     return 0;
> > +}
> > +
> > +static void asus_ec_battery_poll_work(struct work_struct *work)
> > +{
> > +     struct asus_ec_battery_data *priv =
> > +             container_of(work, struct asus_ec_battery_data, poll_work.work);
> > +     int state;
> > +
> > +     state = asus_ec_battery_get_value(priv, POWER_SUPPLY_PROP_STATUS);
> > +     if (state < 0)
> > +             return;
> > +
> > +     if (state & ASUSEC_BATTERY_FULL_CHARGED)
> > +             state = POWER_SUPPLY_STATUS_FULL;
> > +     else if (state & ASUSEC_BATTERY_DISCHARGING)
> > +             state = POWER_SUPPLY_STATUS_DISCHARGING;
> > +     else
> > +             state = POWER_SUPPLY_STATUS_CHARGING;
> > +
> > +     if (priv->last_state != state) {
> > +             priv->last_state = state;
> > +             power_supply_changed(priv->battery);
> > +     }
> > +
> > +     /* continuously send uevent notification */
> > +     schedule_delayed_work(&priv->poll_work,
> > +                           msecs_to_jiffies(ASUSEC_BATTERY_DATA_FRESH_MSEC));
> > +}
> > +
> > +static const struct power_supply_desc asus_ec_battery_desc = {
> > +     .name = "asus-ec-battery",
> > +     .type = POWER_SUPPLY_TYPE_BATTERY,
> > +     .properties = asus_ec_battery_properties,
> > +     .num_properties = ARRAY_SIZE(asus_ec_battery_properties),
> > +     .get_property = asus_ec_battery_get_property,
> > +     .external_power_changed = power_supply_changed,
> > +};
> > +
> > +static int asus_ec_battery_probe(struct platform_device *pdev)
> > +{
> > +     struct asus_ec_battery_data *priv;
> > +     struct device *dev = &pdev->dev;
> > +     struct power_supply_config cfg = { };
> > +     int ret;
> > +
> > +     priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> > +     if (!priv)
> > +             return -ENOMEM;
> > +
> > +     platform_set_drvdata(pdev, priv);
> > +
> > +     mutex_init(&priv->battery_lock);
> > +
> > +     priv->ec = cell_to_ec(pdev);
> > +     priv->batt_data_ts = jiffies - 1;
> > +     priv->last_state = POWER_SUPPLY_STATUS_UNKNOWN;
> > +
> > +     cfg.fwnode = dev_fwnode(dev->parent);
> > +     cfg.drv_data = priv;
> > +
> > +     memcpy(&priv->psy_desc, &asus_ec_battery_desc, sizeof(priv->psy_desc));
> > +     priv->psy_desc.name = devm_kasprintf(dev, GFP_KERNEL, "%s-battery",
> > +                                          priv->ec->name);
> > +
> > +     priv->battery = devm_power_supply_register(dev, &priv->psy_desc, &cfg);
> > +     if (IS_ERR(priv->battery))
> > +             return dev_err_probe(dev, PTR_ERR(priv->battery),
> > +                                  "Failed to register power supply\n");
> > +
> > +     ret = devm_delayed_work_autocancel(dev, &priv->poll_work,
> > +                                        asus_ec_battery_poll_work);
> > +     if (ret)
> > +             return ret;
> > +
> > +     schedule_delayed_work(&priv->poll_work,
> > +                           msecs_to_jiffies(ASUSEC_BATTERY_DATA_FRESH_MSEC));
> > +
> > +     return 0;
> > +}
> > +
> > +static int __maybe_unused asus_ec_battery_suspend(struct device *dev)
> > +{
> > +     struct asus_ec_battery_data *priv = dev_get_drvdata(dev);
> > +
> > +     cancel_delayed_work_sync(&priv->poll_work);
> > +
> > +     return 0;
> > +}
> > +
> > +static int __maybe_unused asus_ec_battery_resume(struct device *dev)
> > +{
> > +     struct asus_ec_battery_data *priv = dev_get_drvdata(dev);
> > +
> > +     schedule_delayed_work(&priv->poll_work,
> > +                           msecs_to_jiffies(ASUSEC_BATTERY_DATA_FRESH_MSEC));
> > +
> > +     return 0;
> > +}
> > +
> > +static SIMPLE_DEV_PM_OPS(asus_ec_battery_pm_ops,
> > +                      asus_ec_battery_suspend, asus_ec_battery_resume);
> > +
> > +static struct platform_driver asus_ec_battery_driver = {
> > +     .driver = {
> > +             .name = "asus-transformer-ec-battery",
> > +             .pm = &asus_ec_battery_pm_ops,
> > +     },
> > +     .probe = asus_ec_battery_probe,
> > +};
> > +module_platform_driver(asus_ec_battery_driver);
> > +
> > +MODULE_AUTHOR("Michał Mirosław <mirq-linux@rere.qmqm.pl>");
> > +MODULE_AUTHOR("Svyatoslav Ryhel <clamor95@gmail.com>");
> > +MODULE_DESCRIPTION("ASUS Transformer's battery driver");
> > +MODULE_LICENSE("GPL");
> > --
> > 2.51.0
> >
> >

Re: [PATCH v5 1/7] dt-bindings: embedded-controller: document ASUS Transformer EC

[Rob Herring (Arm)]

On Wed, 04 Mar 2026 20:57:45 +0200, Svyatoslav Ryhel wrote:
> Document embedded controller used in ASUS Transformer device series.
> 
> Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
> ---
>  .../asus,tf201-ec-pad.yaml                    | 119 ++++++++++++++++++
>  1 file changed, 119 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/embedded-controller/asus,tf201-ec-pad.yaml
> 

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>