[PATCH v2 0/8] EC-based USB Power Delivery support for Chrome machines

[PATCH v2 0/8] EC-based USB Power Delivery support for Chrome machines

[Tomeu Vizoso]

Hi,

this series contains a driver that exposes a power_supply to userspace
representing a port that support USB PD charging.

Allows userspace to display to the user if the machine is charging and
on which port, and if another device is being charged by a port. Also
allows to limit the current draw for thermal reasons.

Thanks,

Tomeu

Changes in v2:
- Allocate enough for the structs in cros_ec_get_host_command_version_mask,
  not their pointers.
- Allocate msg in the stack in get_next_event and
  get_keyboard_state_event, as suggested by Gwendal.
- Remove the mention to Type C from the comments where it didn't make
  sense, as suggested by Benson Leung.
- Split out changes to cros_ec_commands.h and the helpers added to
  mfd/cros_ec.h from the patch that adds the charger driver, as
  suggested by Lee.
- Actually call get_ec_num_ports.
- Move cros_ec_usb_pd_charger_register into cros_ec_dev.c

Benson Leung (1):
  power_supply: Add types for USB Type C and PD chargers

Sameer Nanda (1):
  power: cros_usbpd-charger: Add EC-based USB PD charger driver

Tomeu Vizoso (4):
  mfd: cros_ec: Add cros_ec_cmd_xfer_status helper
  mfd: cros_ec: Add cros_ec_get_host_event
  mfd: cros_ec: Add more definitions for PD commands
  platform/chrome: Register USB PD charger device

Vic Yang (1):
  mfd: cros_ec: Add MKBP event support

Vincent Palatin (1):
  platform/chrome: Check the USB PD feature before creating a charger

 drivers/input/keyboard/cros_ec_keyb.c   | 135 ++---
 drivers/mfd/cros_ec.c                   |  57 +-
 drivers/platform/chrome/cros_ec_dev.c   |  82 +++
 drivers/platform/chrome/cros_ec_proto.c | 129 +++++
 drivers/power/Kconfig                   |  10 +
 drivers/power/Makefile                  |   1 +
 drivers/power/cros_usbpd-charger.c      | 908 ++++++++++++++++++++++++++++++++
 drivers/power/power_supply_sysfs.c      |   3 +-
 include/linux/mfd/cros_ec.h             |  73 +++
 include/linux/mfd/cros_ec_commands.h    | 442 +++++++++++++++-
 include/linux/power_supply.h            |   3 +
 11 files changed, 1730 insertions(+), 113 deletions(-)
 create mode 100644 drivers/power/cros_usbpd-charger.c

-- 
2.5.0

[PATCH v2 2/8] power_supply: Add types for USB Type C and PD chargers

[Tomeu Vizoso]

From: Benson Leung <bleung@chromium.org>

This adds power supply types for USB chargers defined in
the USB Type-C Specification 1.1 and in the
USB Power Delivery Specification Revision 2.0 V1.1.

The following are added :
POWER_SUPPLY_TYPE_USB_TYPE_C,	/* Type C Port */
POWER_SUPPLY_TYPE_USB_PD,	/* Power Delivery Port */
POWER_SUPPLY_TYPE_USB_PD_DRP,	/* PD Dual Role Port */

Signed-off-by: Benson Leung <bleung@chromium.org>
[tomeu: remove the mention to Type C from the comments]
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Reviewed-by: Alec Berg <alecaberg@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Todd Broch <tbroch@chromium.org>
---

Changes in v2:
- Remove the mention to Type C from the comments where it didn't make
  sense, as suggested by Benson Leung.

 drivers/power/power_supply_sysfs.c | 3 ++-
 include/linux/power_supply.h       | 3 +++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/power/power_supply_sysfs.c b/drivers/power/power_supply_sysfs.c
index ed2d7fd0c734..80fed98832f9 100644
--- a/drivers/power/power_supply_sysfs.c
+++ b/drivers/power/power_supply_sysfs.c
@@ -45,7 +45,8 @@ static ssize_t power_supply_show_property(struct device *dev,
 					  char *buf) {
 	static char *type_text[] = {
 		"Unknown", "Battery", "UPS", "Mains", "USB",
-		"USB_DCP", "USB_CDP", "USB_ACA"
+		"USB_DCP", "USB_CDP", "USB_ACA", "USB_C",
+		"USB_PD", "USB_PD_DRP"
 	};
 	static char *status_text[] = {
 		"Unknown", "Charging", "Discharging", "Not charging", "Full"
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index ef9f1592185d..751061790626 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -163,6 +163,9 @@ enum power_supply_type {
 	POWER_SUPPLY_TYPE_USB_DCP,	/* Dedicated Charging Port */
 	POWER_SUPPLY_TYPE_USB_CDP,	/* Charging Downstream Port */
 	POWER_SUPPLY_TYPE_USB_ACA,	/* Accessory Charger Adapters */
+	POWER_SUPPLY_TYPE_USB_TYPE_C,	/* Type C Port */
+	POWER_SUPPLY_TYPE_USB_PD,	/* Power Delivery Port */
+	POWER_SUPPLY_TYPE_USB_PD_DRP,	/* PD Dual Role Port */
 };
 
 enum power_supply_notifier_events {
-- 
2.5.0

Re: [PATCH v2 2/8] power_supply: Add types for USB Type C and PD chargers

[Sebastian Reichel]

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Hi Tomeu,

On Fri, Feb 12, 2016 at 01:56:59PM +0100, Tomeu Vizoso wrote:
> From: Benson Leung <bleung@chromium.org>
> 
> This adds power supply types for USB chargers defined in
> the USB Type-C Specification 1.1 and in the
> USB Power Delivery Specification Revision 2.0 V1.1.
> 
> The following are added :
> POWER_SUPPLY_TYPE_USB_TYPE_C,	/* Type C Port */
> POWER_SUPPLY_TYPE_USB_PD,	/* Power Delivery Port */
> POWER_SUPPLY_TYPE_USB_PD_DRP,	/* PD Dual Role Port */
> 
> Signed-off-by: Benson Leung <bleung@chromium.org>
> [tomeu: remove the mention to Type C from the comments]
> Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
> Reviewed-by: Alec Berg <alecaberg@chromium.org>
> Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
> Reviewed-by: Todd Broch <tbroch@chromium.org>

I queued this patch for 4.6.

-- Sebastian

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[PATCH v2 6/8] power: cros_usbpd-charger: Add EC-based USB PD charger driver

[Tomeu Vizoso]

From: Sameer Nanda <snanda@chromium.org>

This driver exposes the charger functionality in the PD EC to userspace.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Cc: Sameer Nanda <snanda@chromium.org>
Cc: Benson Leung <bleung@chromium.org>
Cc: Shawn Nematbakhsh <shawnn@chromium.org>
---

Changes in v2:
- Split out changes to cros_ec_commands.h and the helpers added to
  mfd/cros_ec.h from the patch that adds the charger driver, as
  suggested by Lee.
- Actually call get_ec_num_ports.

 drivers/power/Kconfig              |  10 +
 drivers/power/Makefile             |   1 +
 drivers/power/cros_usbpd-charger.c | 908 +++++++++++++++++++++++++++++++++++++
 3 files changed, 919 insertions(+)
 create mode 100644 drivers/power/cros_usbpd-charger.c

diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 1ddd13cc0c07..26355850d91b 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -502,6 +502,16 @@ config AXP20X_POWER
 	  This driver provides support for the power supply features of
 	  AXP20x PMIC.
 
+config CHARGER_CROS_USB_PD
+	tristate "Chrome OS EC based USB PD charger"
+	depends on MFD_CROS_EC
+	default y
+	help
+	  Say Y here to enable Chrome OS EC based USB PD charger driver. This
+	  driver gets various bits of information about what is connected to
+	  USB PD ports from the EC and converts that into power_supply
+	  properties.
+
 endif # POWER_SUPPLY
 
 source "drivers/power/reset/Kconfig"
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index 0e4eab55f8d7..b83685bfae61 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -73,3 +73,4 @@ obj-$(CONFIG_CHARGER_TPS65217)	+= tps65217_charger.o
 obj-$(CONFIG_POWER_RESET)	+= reset/
 obj-$(CONFIG_AXP288_FUEL_GAUGE) += axp288_fuel_gauge.o
 obj-$(CONFIG_AXP288_CHARGER)	+= axp288_charger.o
+obj-$(CONFIG_CHARGER_CROS_USB_PD)	+= cros_usbpd-charger.o
diff --git a/drivers/power/cros_usbpd-charger.c b/drivers/power/cros_usbpd-charger.c
new file mode 100644
index 000000000000..c1aa58b47f56
--- /dev/null
+++ b/drivers/power/cros_usbpd-charger.c
@@ -0,0 +1,908 @@
+/*
+ * Power supply driver for ChromeOS EC based USB PD Charger.
+ *
+ * Copyright (c) 2014 Google, Inc
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/fs.h>
+#include <linux/ktime.h>
+#include <linux/module.h>
+#include <linux/mfd/cros_ec.h>
+#include <linux/mfd/cros_ec_commands.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/rtc.h>
+#include <linux/slab.h>
+
+#define CROS_USB_PD_MAX_PORTS		8
+#define CROS_USB_PD_MAX_LOG_ENTRIES	30
+
+#define CROS_USB_PD_LOG_UPDATE_DELAY msecs_to_jiffies(60000)
+#define CROS_USB_PD_CACHE_UPDATE_DELAY msecs_to_jiffies(500)
+
+/* Buffer + macro for building PDLOG string */
+#define BUF_SIZE 80
+#define APPEND_STRING(buf, len, str, ...) ((len) += \
+	snprintf((buf) + (len), max(BUF_SIZE - (len), 0), (str), ##__VA_ARGS__))
+
+#define CHARGER_DIR_NAME		"CROS_USB_PD_CHARGER%d"
+#define CHARGER_DIR_NAME_LENGTH		sizeof(CHARGER_DIR_NAME)
+
+#define MANUFACTURER_MODEL_LENGTH	32
+
+struct port_data {
+	int port_number;
+	char name[CHARGER_DIR_NAME_LENGTH];
+	char manufacturer[MANUFACTURER_MODEL_LENGTH];
+	char model_name[MANUFACTURER_MODEL_LENGTH];
+	struct power_supply *psy;
+	struct power_supply_desc psy_desc;
+	int psy_type;
+	int psy_online;
+	int psy_status;
+	int psy_current_max;
+	int psy_voltage_max_design;
+	int psy_voltage_now;
+	int psy_power_max;
+	struct charger_data *charger;
+	unsigned long last_update;
+};
+
+struct charger_data {
+	struct device *dev;
+	struct cros_ec_dev *ec_dev;
+	struct cros_ec_device *ec_device;
+	int num_charger_ports;
+	int num_registered_psy;
+	struct port_data *ports[CROS_USB_PD_MAX_PORTS];
+	struct delayed_work log_work;
+	struct workqueue_struct *log_workqueue;
+	struct notifier_block notifier;
+	bool suspended;
+};
+
+#define EC_MAX_IN_SIZE EC_PROTO2_MAX_REQUEST_SIZE
+#define EC_MAX_OUT_SIZE EC_PROTO2_MAX_RESPONSE_SIZE
+uint8_t ec_inbuf[EC_MAX_IN_SIZE];
+uint8_t ec_outbuf[EC_MAX_OUT_SIZE];
+
+static enum power_supply_property cros_usb_pd_charger_props[] = {
+	POWER_SUPPLY_PROP_ONLINE,
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_CURRENT_MAX,
+	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
+	POWER_SUPPLY_PROP_VOLTAGE_NOW,
+	POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX,
+	POWER_SUPPLY_PROP_MODEL_NAME,
+	POWER_SUPPLY_PROP_MANUFACTURER,
+};
+
+/* Current external voltage/current limit in mV/mA. Default to none. */
+static uint16_t ext_voltage_lim = EC_POWER_LIMIT_NONE;
+static uint16_t ext_current_lim = EC_POWER_LIMIT_NONE;
+
+static int ec_command(struct cros_ec_dev *ec_dev, int version, int command,
+		      uint8_t *outdata, int outsize, uint8_t *indata,
+		      int insize)
+{
+	struct cros_ec_device *ec_device = ec_dev->ec_dev;
+	struct cros_ec_command *msg;
+	int ret;
+
+	msg = kmalloc(sizeof(*msg) + max(outsize, insize), GFP_KERNEL);
+	if (!msg)
+		return -ENOMEM;
+
+	msg->version = version;
+	msg->command = ec_dev->cmd_offset + command;
+	msg->outsize = outsize;
+	msg->insize = insize;
+
+	memcpy(msg->data, outdata, outsize);
+	ret = cros_ec_cmd_xfer_status(ec_device, msg);
+	memcpy(indata, msg->data, insize);
+
+	kfree(msg);
+
+	return ret;
+}
+
+static int set_ec_usb_pd_override_ports(struct charger_data *charger,
+					int port_num)
+{
+	struct device *dev = charger->dev;
+	struct ec_params_charge_port_override req;
+	int ret;
+
+	req.override_port = port_num;
+
+	ret = ec_command(charger->ec_dev, 0, EC_CMD_PD_CHARGE_PORT_OVERRIDE,
+			 (uint8_t *)&req, sizeof(req),
+			 NULL, 0);
+	if (ret < 0) {
+		dev_info(dev, "Port Override command returned 0x%x\n", ret);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int get_ec_num_ports(struct charger_data *charger, int *num_ports)
+{
+	struct device *dev = charger->dev;
+	struct ec_response_usb_pd_ports *resp =
+	    (struct ec_response_usb_pd_ports *)ec_inbuf;
+	int ret;
+
+	*num_ports = 0;
+	ret = ec_command(charger->ec_dev, 0, EC_CMD_USB_PD_PORTS,
+			 NULL, 0, ec_inbuf, EC_MAX_IN_SIZE);
+	if (ret < 0) {
+		dev_err(dev, "Unable to query PD ports (err:0x%x)\n", ret);
+		return ret;
+	}
+	*num_ports = resp->num_ports;
+	dev_dbg(dev, "Num ports = %d\n", *num_ports);
+
+	return 0;
+}
+
+static int get_ec_usb_pd_discovery_info(struct port_data *port)
+{
+	struct charger_data *charger = port->charger;
+	struct device *dev = charger->dev;
+	struct ec_params_usb_pd_info_request req;
+	struct ec_params_usb_pd_discovery_entry resp;
+	int ret;
+
+	req.port = port->port_number;
+
+	ret = ec_command(charger->ec_dev, 0, EC_CMD_USB_PD_DISCOVERY,
+			 (uint8_t *)&req, sizeof(req),
+			 (uint8_t *)&resp, sizeof(resp));
+	if (ret < 0) {
+		dev_err(dev, "Unable to query Discovery info (err:0x%x)\n",
+			 ret);
+		return -EINVAL;
+	}
+
+	dev_dbg(dev, "Port %d: VID = 0x%x, PID=0x%x, PTYPE=0x%x\n",
+		port->port_number, resp.vid, resp.pid, resp.ptype);
+
+	snprintf(port->manufacturer, MANUFACTURER_MODEL_LENGTH, "%x", resp.vid);
+	snprintf(port->model_name, MANUFACTURER_MODEL_LENGTH, "%x", resp.pid);
+
+	return 0;
+}
+
+static int get_ec_usb_pd_power_info(struct port_data *port)
+{
+	struct charger_data *charger = port->charger;
+	struct device *dev = charger->dev;
+	struct ec_params_usb_pd_power_info req;
+	struct ec_response_usb_pd_power_info resp;
+	char role_str[80];
+	int ret, last_psy_status, last_psy_type;
+
+	req.port = port->port_number;
+	ret = ec_command(charger->ec_dev, 0, EC_CMD_USB_PD_POWER_INFO,
+			 (uint8_t *)&req, sizeof(req),
+			 (uint8_t *)&resp, sizeof(resp));
+	if (ret < 0) {
+		dev_err(dev, "Unable to query PD power info (err:0x%x)\n", ret);
+		return -EINVAL;
+	}
+
+	last_psy_status = port->psy_status;
+	last_psy_type = port->psy_type;
+
+	switch (resp.role) {
+	case USB_PD_PORT_POWER_DISCONNECTED:
+		snprintf(role_str, sizeof(role_str), "%s", "DISCONNECTED");
+		port->psy_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
+		port->psy_online = 0;
+		break;
+	case USB_PD_PORT_POWER_SOURCE:
+		snprintf(role_str, sizeof(role_str), "%s", "SOURCE");
+		port->psy_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
+		port->psy_online = 0;
+		break;
+	case USB_PD_PORT_POWER_SINK:
+		snprintf(role_str, sizeof(role_str), "%s", "SINK");
+		port->psy_status = POWER_SUPPLY_STATUS_CHARGING;
+		port->psy_online = 1;
+		break;
+	case USB_PD_PORT_POWER_SINK_NOT_CHARGING:
+		snprintf(role_str, sizeof(role_str), "%s", "NOT CHARGING");
+		port->psy_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
+		port->psy_online = 1;
+		break;
+	default:
+		snprintf(role_str, sizeof(role_str), "%s", "UNKNOWN");
+		dev_err(dev, "Unknown role %d\n", resp.role);
+		break;
+	}
+
+	port->psy_voltage_max_design = resp.meas.voltage_max;
+	port->psy_voltage_now = resp.meas.voltage_now;
+	port->psy_current_max = resp.meas.current_max;
+	port->psy_power_max = resp.max_power;
+
+	switch (resp.type) {
+	case USB_CHG_TYPE_BC12_SDP:
+	case USB_CHG_TYPE_VBUS:
+		port->psy_type = POWER_SUPPLY_TYPE_USB;
+		break;
+	case USB_CHG_TYPE_NONE:
+		/*
+		 * For dual-role devices when we are a source, the firmware
+		 * reports the type as NONE. Report such chargers as type
+		 * USB_PD_DRP.
+		 */
+		if (resp.role == USB_PD_PORT_POWER_SOURCE && resp.dualrole)
+			port->psy_type = POWER_SUPPLY_TYPE_USB_PD_DRP;
+		else
+			port->psy_type = POWER_SUPPLY_TYPE_USB;
+		break;
+	case USB_CHG_TYPE_PROPRIETARY:
+		port->psy_type = POWER_SUPPLY_TYPE_MAINS;
+		break;
+	case USB_CHG_TYPE_C:
+		port->psy_type = POWER_SUPPLY_TYPE_USB_TYPE_C;
+		break;
+	case USB_CHG_TYPE_BC12_DCP:
+		port->psy_type = POWER_SUPPLY_TYPE_USB_DCP;
+		break;
+	case USB_CHG_TYPE_BC12_CDP:
+		port->psy_type = POWER_SUPPLY_TYPE_USB_CDP;
+		break;
+	case USB_CHG_TYPE_PD:
+		if (resp.dualrole)
+			port->psy_type = POWER_SUPPLY_TYPE_USB_PD_DRP;
+		else
+			port->psy_type = POWER_SUPPLY_TYPE_USB_PD;
+		break;
+	case USB_CHG_TYPE_UNKNOWN:
+		/*
+		 * While the EC is trying to determine the type of charger that
+		 * has been plugged in, it will report the charger type as
+		 * unknown. Treat this case as a dedicated charger since we
+		 * don't know any better just yet. Additionally since the power
+		 * capabilities are unknown, report the max current and voltage
+		 * as zero.
+		 */
+		port->psy_type = POWER_SUPPLY_TYPE_MAINS;
+		port->psy_voltage_max_design = 0;
+		port->psy_current_max = 0;
+		break;
+	default:
+		dev_err(dev, "Port %d: default case!\n",
+			port->port_number);
+		port->psy_type = POWER_SUPPLY_TYPE_USB;
+	}
+
+	port->psy_desc.type = port->psy_type;
+
+	dev_dbg(dev,
+		"Port %d: %s type=%d=vmax=%d vnow=%d cmax=%d clim=%d pmax=%d\n",
+		port->port_number, role_str, resp.type,
+		resp.meas.voltage_max, resp.meas.voltage_now,
+		resp.meas.current_max, resp.meas.current_lim,
+		resp.max_power);
+
+	/*
+	 * If power supply type or status changed, explicitly call
+	 * power_supply_changed. This results in udev event getting generated
+	 * and allows user mode apps to react quicker instead of waiting for
+	 * their next poll of power supply status.
+	 */
+	if (last_psy_type != port->psy_type ||
+	    last_psy_status != port->psy_status) {
+		dev_dbg(dev, "Port %d: Calling power_supply_changed\n",
+			port->port_number);
+		power_supply_changed(port->psy);
+	}
+
+	return 0;
+}
+
+static int get_ec_port_status(struct port_data *port, bool ratelimit)
+{
+	int ret;
+
+	if (ratelimit &&
+	    time_is_after_jiffies(port->last_update +
+				  CROS_USB_PD_CACHE_UPDATE_DELAY))
+		return 0;
+
+	ret = get_ec_usb_pd_power_info(port);
+	if (ret < 0)
+		return ret;
+
+	ret = get_ec_usb_pd_discovery_info(port);
+	port->last_update = jiffies;
+
+	return ret;
+}
+
+static void cros_usb_pd_charger_power_changed(struct power_supply *psy)
+{
+	struct port_data *port = power_supply_get_drvdata(psy);
+	struct charger_data *charger = port->charger;
+	struct device *dev = charger->dev;
+	int i;
+
+	dev_dbg(dev, "cros_usb_pd_charger_power_changed\n");
+	for (i = 0; i < charger->num_registered_psy; i++)
+		get_ec_port_status(charger->ports[i], false);
+}
+
+static int cros_usb_pd_charger_get_prop(struct power_supply *psy,
+				    enum power_supply_property psp,
+				    union power_supply_propval *val)
+{
+	struct port_data *port = power_supply_get_drvdata(psy);
+	struct charger_data *charger = port->charger;
+	struct device *dev = charger->dev;
+	int ret;
+
+
+	/* Only refresh ec_port_status for dynamic properties */
+	switch (psp) {
+	case POWER_SUPPLY_PROP_CURRENT_MAX:
+	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
+	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+	case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX:
+		ret = get_ec_port_status(port, true);
+		if (ret < 0) {
+			dev_err(dev, "Failed to get port status (err:0x%x)\n",
+				ret);
+			return -EINVAL;
+		}
+		break;
+	default:
+		break;
+	}
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_ONLINE:
+		val->intval = port->psy_online;
+		break;
+	case POWER_SUPPLY_PROP_STATUS:
+		val->intval = port->psy_status;
+		break;
+	case POWER_SUPPLY_PROP_CURRENT_MAX:
+		val->intval = port->psy_current_max * 1000;
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
+		val->intval = port->psy_voltage_max_design * 1000;
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+		val->intval = port->psy_voltage_now * 1000;
+		break;
+	case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX:
+		/* TODO: send a TBD host command to the EC. */
+		val->intval = 0;
+		break;
+	case POWER_SUPPLY_PROP_MODEL_NAME:
+		val->strval = port->model_name;
+		break;
+	case POWER_SUPPLY_PROP_MANUFACTURER:
+		val->strval = port->manufacturer;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int cros_usb_pd_charger_set_prop(struct power_supply *psy,
+				    enum power_supply_property psp,
+				    const union power_supply_propval *val)
+{
+	struct port_data *port = power_supply_get_drvdata(psy);
+	struct charger_data *charger = port->charger;
+	int port_number;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX:
+		/*
+		 * A value of -1 implies switching to battery as the power
+		 * source. Any other value implies using this port as the
+		 * power source.
+		 */
+		port_number = val->intval;
+		if (port_number != -1)
+			port_number = port->port_number;
+		return set_ec_usb_pd_override_ports(charger, port_number);
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int cros_usb_pd_charger_is_writeable(struct power_supply *psy,
+		enum power_supply_property psp)
+{
+	int ret;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX:
+		ret = 1;
+		break;
+	default:
+		ret = 0;
+	}
+
+	return ret;
+}
+
+static void cros_usb_pd_print_log_entry(struct ec_response_pd_log *r,
+					ktime_t tstamp)
+{
+	static const char * const fault_names[] = {
+		"---", "OCP", "fast OCP", "OVP", "Discharge"
+	};
+	static const char * const role_names[] = {
+		"Disconnected", "SRC", "SNK", "SNK (not charging)"
+	};
+	static const char * const chg_type_names[] = {
+		"None", "PD", "Type-C", "Proprietary",
+		"DCP", "CDP", "SDP", "Other", "VBUS"
+	};
+	int i;
+	int role_idx, type_idx;
+	const char *fault, *role, *chg_type;
+	struct usb_chg_measures *meas;
+	struct mcdp_info *minfo;
+	struct rtc_time rt;
+	int len = 0;
+	char buf[BUF_SIZE + 1];
+
+	/* the timestamp is the number of 1024th of seconds in the past */
+	tstamp = ktime_sub_us(tstamp,
+		 (uint64_t)r->timestamp << PD_LOG_TIMESTAMP_SHIFT);
+	rt = rtc_ktime_to_tm(tstamp);
+
+	switch (r->type) {
+	case PD_EVENT_MCU_CHARGE:
+		if (r->data & CHARGE_FLAGS_OVERRIDE)
+			APPEND_STRING(buf, len, "override ");
+		if (r->data & CHARGE_FLAGS_DELAYED_OVERRIDE)
+			APPEND_STRING(buf, len, "pending_override ");
+		role_idx = r->data & CHARGE_FLAGS_ROLE_MASK;
+		role = role_idx < ARRAY_SIZE(role_names) ?
+			role_names[role_idx] : "Unknown";
+		type_idx = (r->data & CHARGE_FLAGS_TYPE_MASK)
+			 >> CHARGE_FLAGS_TYPE_SHIFT;
+		chg_type = type_idx < ARRAY_SIZE(chg_type_names) ?
+			chg_type_names[type_idx] : "???";
+
+		if ((role_idx == USB_PD_PORT_POWER_DISCONNECTED) ||
+		    (role_idx == USB_PD_PORT_POWER_SOURCE)) {
+			APPEND_STRING(buf, len, "%s", role);
+			break;
+		}
+
+		meas = (struct usb_chg_measures *)r->payload;
+		APPEND_STRING(buf, len, "%s %s %s %dmV max %dmV / %dmA", role,
+			r->data & CHARGE_FLAGS_DUAL_ROLE ? "DRP" : "Charger",
+			chg_type,
+			meas->voltage_now,
+			meas->voltage_max,
+			meas->current_max);
+		break;
+	case PD_EVENT_ACC_RW_FAIL:
+		APPEND_STRING(buf, len, "RW signature check failed");
+		break;
+	case PD_EVENT_PS_FAULT:
+		fault = r->data < ARRAY_SIZE(fault_names) ? fault_names[r->data]
+							  : "???";
+		APPEND_STRING(buf, len, "Power supply fault: %s", fault);
+		break;
+	case PD_EVENT_VIDEO_DP_MODE:
+		APPEND_STRING(buf, len, "DP mode %sabled",
+			      (r->data == 1) ? "en" : "dis");
+		break;
+	case PD_EVENT_VIDEO_CODEC:
+		minfo = (struct mcdp_info *)r->payload;
+		APPEND_STRING(buf, len,
+			      "HDMI info: family:%04x chipid:%04x irom:%d.%d.%d fw:%d.%d.%d",
+			      MCDP_FAMILY(minfo->family),
+			      MCDP_CHIPID(minfo->chipid),
+			      minfo->irom.major, minfo->irom.minor,
+			      minfo->irom.build, minfo->fw.major,
+			      minfo->fw.minor, minfo->fw.build);
+		break;
+	default:
+		APPEND_STRING(buf, len,
+			"Event %02x (%04x) [", r->type, r->data);
+		for (i = 0; i < PD_LOG_SIZE(r->size_port); i++)
+			APPEND_STRING(buf, len, "%02x ", r->payload[i]);
+		APPEND_STRING(buf, len, "]");
+		break;
+	}
+
+	pr_info("PDLOG %d/%02d/%02d %02d:%02d:%02d.%03d P%d %s\n",
+		rt.tm_year + 1900, rt.tm_mon + 1, rt.tm_mday,
+		rt.tm_hour, rt.tm_min, rt.tm_sec,
+		(int)(ktime_to_ms(tstamp) % MSEC_PER_SEC),
+		PD_LOG_PORT(r->size_port), buf);
+}
+
+static void cros_usb_pd_log_check(struct work_struct *work)
+{
+	struct charger_data *charger = container_of(to_delayed_work(work),
+		struct charger_data, log_work);
+	struct device *dev = charger->dev;
+	union {
+		struct ec_response_pd_log r;
+		uint32_t words[8]; /* space for the payload */
+	} u;
+	int ret;
+	int entries = 0;
+	ktime_t now;
+
+	if (charger->suspended) {
+		dev_dbg(dev, "Suspended...bailing out\n");
+		return;
+	}
+
+	while (entries++ < CROS_USB_PD_MAX_LOG_ENTRIES) {
+		ret = ec_command(charger->ec_dev, 0, EC_CMD_PD_GET_LOG_ENTRY,
+				 NULL, 0, (uint8_t *)&u, sizeof(u));
+		now = ktime_get_real();
+		if (ret < 0) {
+			dev_dbg(dev, "Cannot get PD log %d\n", ret);
+			break;
+		}
+		if (u.r.type == PD_EVENT_NO_ENTRY)
+			break;
+
+		cros_usb_pd_print_log_entry(&u.r, now);
+	}
+
+	queue_delayed_work(charger->log_workqueue, &charger->log_work,
+		CROS_USB_PD_LOG_UPDATE_DELAY);
+}
+
+static int cros_usb_pd_ec_event(struct notifier_block *nb,
+	unsigned long queued_during_suspend, void *_notify)
+{
+	struct charger_data *charger;
+	struct device *dev;
+	struct cros_ec_device *ec_device;
+	u32 host_event;
+
+	charger = container_of(nb, struct charger_data, notifier);
+	dev = charger->dev;
+	ec_device = charger->ec_device;
+
+	host_event = cros_ec_get_host_event(ec_device);
+	if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_PD_MCU)) {
+		cros_usb_pd_charger_power_changed(charger->ports[0]->psy);
+		return NOTIFY_OK;
+	} else {
+		return NOTIFY_DONE;
+	}
+}
+
+static char *charger_supplied_to[] = {"cros-usb_pd-charger"};
+
+static int cros_usb_pd_charger_probe(struct platform_device *pd)
+{
+	struct device *dev = &pd->dev;
+	struct cros_ec_dev *ec_dev = dev_get_drvdata(pd->dev.parent);
+	struct cros_ec_device *ec_device;
+	struct charger_data *charger;
+	struct port_data *port;
+	struct power_supply_desc *psy_desc;
+	struct power_supply_config psy_cfg = {};
+	int i;
+	int ret = -EINVAL;
+
+	dev_dbg(dev, "cros_usb_pd_charger_probe\n");
+	if (!ec_dev) {
+		WARN(1, "%s: No EC dev found\n", dev_name(dev));
+		return -EINVAL;
+	}
+
+	ec_device = ec_dev->ec_dev;
+	if (!ec_device) {
+		WARN(1, "%s: No EC device found\n", dev_name(dev));
+		return -EINVAL;
+	}
+
+	charger = devm_kzalloc(dev, sizeof(struct charger_data),
+				    GFP_KERNEL);
+	if (!charger)
+		return -ENOMEM;
+
+	charger->dev = dev;
+	charger->ec_dev = ec_dev;
+	charger->ec_device = ec_device;
+
+	platform_set_drvdata(pd, charger);
+
+	if ((get_ec_num_ports(charger, &charger->num_charger_ports) < 0) ||
+	    !charger->num_charger_ports) {
+		/*
+		 * This can happen on a system that doesn't support USB PD.
+		 * Log a message, but no need to warn.
+		 */
+		dev_info(dev, "No charging ports found\n");
+		ret = -ENODEV;
+		goto fail_nowarn;
+	}
+
+	for (i = 0; i < charger->num_charger_ports; i++) {
+		port = devm_kzalloc(dev, sizeof(struct port_data), GFP_KERNEL);
+		if (!port) {
+			dev_err(dev, "Failed to alloc port structure\n");
+			ret = -ENOMEM;
+			goto fail;
+		}
+
+		port->charger = charger;
+		port->port_number = i;
+		sprintf(port->name, CHARGER_DIR_NAME, i);
+
+		psy_desc = &port->psy_desc;
+		psy_desc->name = port->name;
+		psy_desc->type = POWER_SUPPLY_TYPE_USB;
+		psy_desc->get_property = cros_usb_pd_charger_get_prop;
+		psy_desc->set_property = cros_usb_pd_charger_set_prop;
+		psy_desc->property_is_writeable =
+			cros_usb_pd_charger_is_writeable;
+		psy_desc->external_power_changed =
+			cros_usb_pd_charger_power_changed;
+		psy_desc->properties = cros_usb_pd_charger_props;
+		psy_desc->num_properties = ARRAY_SIZE(
+			cros_usb_pd_charger_props);
+
+		psy_cfg.drv_data = port;
+		psy_cfg.supplied_to = charger_supplied_to;
+		psy_cfg.num_supplicants = ARRAY_SIZE(charger_supplied_to);
+
+		port->psy = power_supply_register_no_ws(dev, psy_desc,
+							&psy_cfg);
+		if (IS_ERR(port->psy)) {
+			dev_err(dev, "Failed to register power supply: %ld\n",
+				PTR_ERR(port->psy));
+			continue;
+		}
+
+		charger->ports[charger->num_registered_psy++] = port;
+	}
+
+	if (!charger->num_registered_psy) {
+		ret = -ENODEV;
+		dev_err(dev, "No power supplies registered\n");
+		goto fail;
+	}
+
+	if (ec_device->mkbp_event_supported) {
+		/* Get PD events from the EC */
+		charger->notifier.notifier_call = cros_usb_pd_ec_event;
+		ret = blocking_notifier_chain_register(
+			&ec_device->event_notifier, &charger->notifier);
+		if (ret < 0)
+			dev_warn(dev, "failed to register notifier\n");
+	}
+
+	/* Retrieve PD event logs periodically */
+	INIT_DELAYED_WORK(&charger->log_work, cros_usb_pd_log_check);
+	charger->log_workqueue =
+		create_singlethread_workqueue("cros_usb_pd_log");
+	queue_delayed_work(charger->log_workqueue, &charger->log_work,
+		CROS_USB_PD_LOG_UPDATE_DELAY);
+
+	return 0;
+
+fail:
+	WARN(1, "%s: Failing probe (err:0x%x)\n", dev_name(dev), ret);
+
+fail_nowarn:
+	if (charger) {
+		for (i = 0; i < charger->num_registered_psy; i++) {
+			port = charger->ports[i];
+			power_supply_unregister(port->psy);
+			devm_kfree(dev, port);
+		}
+		platform_set_drvdata(pd, NULL);
+		devm_kfree(dev, charger);
+	}
+
+	dev_info(dev, "Failing probe (err:0x%x)\n", ret);
+	return ret;
+}
+
+static int cros_usb_pd_charger_remove(struct platform_device *pd)
+{
+	struct charger_data *charger = platform_get_drvdata(pd);
+	struct device *dev = charger->dev;
+	struct port_data *port;
+	int i;
+
+	if (charger) {
+		for (i = 0; i < charger->num_registered_psy; i++) {
+			port = charger->ports[i];
+			power_supply_unregister(port->psy);
+			devm_kfree(dev, port);
+		}
+		flush_delayed_work(&charger->log_work);
+		platform_set_drvdata(pd, NULL);
+		devm_kfree(dev, charger);
+	}
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int cros_usb_pd_charger_resume(struct device *dev)
+{
+	struct charger_data *charger = dev_get_drvdata(dev);
+	int i;
+
+	if (!charger)
+		return 0;
+
+	charger->suspended = false;
+
+	dev_dbg(dev, "cros_usb_pd_charger_resume: updating power supplies\n");
+	for (i = 0; i < charger->num_registered_psy; i++) {
+		power_supply_changed(charger->ports[i]->psy);
+		charger->ports[i]->last_update =
+				jiffies - CROS_USB_PD_CACHE_UPDATE_DELAY;
+	}
+	queue_delayed_work(charger->log_workqueue, &charger->log_work,
+		CROS_USB_PD_LOG_UPDATE_DELAY);
+
+	return 0;
+}
+
+static int cros_usb_pd_charger_suspend(struct device *dev)
+{
+	struct charger_data *charger = dev_get_drvdata(dev);
+
+	charger->suspended = true;
+
+	if (charger)
+		flush_delayed_work(&charger->log_work);
+	return 0;
+}
+#endif
+
+static int set_ec_ext_power_limit(struct cros_ec_dev *ec,
+				  uint16_t current_lim, uint16_t voltage_lim)
+{
+	struct ec_params_external_power_limit_v1 req;
+	int ret;
+
+	req.current_lim = current_lim;
+	req.voltage_lim = voltage_lim;
+
+	ret = ec_command(ec, 0, EC_CMD_EXT_POWER_CURRENT_LIMIT,
+			 (uint8_t *)&req, sizeof(req), NULL, 0);
+	if (ret < 0) {
+		dev_warn(ec->dev,
+			 "External power limit command returned 0x%x\n",
+			 ret);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static ssize_t get_ec_ext_current_lim(struct device *dev,
+				      struct device_attribute *attr,
+				      char *buf)
+{
+	return scnprintf(buf, PAGE_SIZE, "%d\n", ext_current_lim);
+}
+
+static ssize_t set_ec_ext_current_lim(struct device *dev,
+				      struct device_attribute *attr,
+				      const char *buf, size_t count)
+{
+	int ret;
+	uint16_t tmp_val;
+	struct cros_ec_dev *ec = container_of(
+			dev, struct cros_ec_dev, class_dev);
+
+	if (kstrtou16(buf, 0, &tmp_val) < 0)
+		return -EINVAL;
+
+	ret = set_ec_ext_power_limit(ec, tmp_val, ext_voltage_lim);
+	if (ret < 0)
+		return ret;
+
+	ext_current_lim = tmp_val;
+	if (ext_current_lim == EC_POWER_LIMIT_NONE)
+		dev_info(ec->dev, "External current limit removed\n");
+	else
+		dev_info(ec->dev, "External current limit set to %dmA\n",
+			 ext_current_lim);
+
+	return count;
+}
+
+static ssize_t get_ec_ext_voltage_lim(struct device *dev,
+				      struct device_attribute *attr,
+				      char *buf)
+{
+	return scnprintf(buf, PAGE_SIZE, "%d\n", ext_voltage_lim);
+}
+
+static ssize_t set_ec_ext_voltage_lim(struct device *dev,
+				      struct device_attribute *attr,
+				      const char *buf, size_t count)
+{
+	int ret;
+	uint16_t tmp_val;
+
+	struct cros_ec_dev *ec = container_of(
+			dev, struct cros_ec_dev, class_dev);
+
+	if (kstrtou16(buf, 0, &tmp_val) < 0)
+		return -EINVAL;
+
+	ret = set_ec_ext_power_limit(ec, ext_current_lim, tmp_val);
+	if (ret < 0)
+		return ret;
+
+	ext_voltage_lim = tmp_val;
+	if (ext_voltage_lim == EC_POWER_LIMIT_NONE)
+		dev_info(ec->dev, "External voltage limit removed\n");
+	else
+		dev_info(ec->dev, "External voltage limit set to %dmV\n",
+			 ext_voltage_lim);
+
+	return count;
+}
+
+static DEVICE_ATTR(ext_current_lim, S_IWUSR | S_IWGRP | S_IRUGO,
+		   get_ec_ext_current_lim,
+		   set_ec_ext_current_lim);
+static DEVICE_ATTR(ext_voltage_lim, S_IWUSR | S_IWGRP | S_IRUGO,
+		   get_ec_ext_voltage_lim,
+		   set_ec_ext_voltage_lim);
+
+static struct attribute *__ext_power_cmds_attrs[] = {
+	&dev_attr_ext_current_lim.attr,
+	&dev_attr_ext_voltage_lim.attr,
+	NULL,
+};
+
+struct attribute_group cros_usb_pd_charger_attr_group = {
+	.name = "usb-pd-charger",
+	.attrs = __ext_power_cmds_attrs,
+};
+
+static SIMPLE_DEV_PM_OPS(cros_usb_pd_charger_pm_ops,
+	cros_usb_pd_charger_suspend, cros_usb_pd_charger_resume);
+
+static struct platform_driver cros_usb_pd_charger_driver = {
+	.driver = {
+		.name = "cros-usb-pd-charger",
+		.owner = THIS_MODULE,
+		.pm = &cros_usb_pd_charger_pm_ops,
+	},
+	.probe = cros_usb_pd_charger_probe,
+	.remove = cros_usb_pd_charger_remove,
+};
+
+module_platform_driver(cros_usb_pd_charger_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Chrome USB PD charger");
+MODULE_ALIAS("power_supply:cros-usb-pd-charger");
-- 
2.5.0

Re: [PATCH v2 6/8] power: cros_usbpd-charger: Add EC-based USB PD charger driver

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 920 bytes --]

Hi Sameer,

[auto build test ERROR on ljones-mfd/for-mfd-next]
[also build test ERROR on v4.5-rc3 next-20160212]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Tomeu-Vizoso/EC-based-USB-Power-Delivery-support-for-Chrome-machines/20160212-210229
base:   https://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd.git for-mfd-next
config: i386-randconfig-s0-201606 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   drivers/built-in.o: In function `cros_usb_pd_print_log_entry':
>> cros_usbpd-charger.c:(.text+0xdab0a5): undefined reference to `__moddi3'

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[-- Attachment #2: .config.gz --]
[-- Type: application/octet-stream, Size: 23622 bytes --]

Re: [PATCH v2 6/8] power: cros_usbpd-charger: Add EC-based USB PD charger driver

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 848 bytes --]

Hi Sameer,

[auto build test ERROR on ljones-mfd/for-mfd-next]
[also build test ERROR on v4.5-rc3 next-20160212]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Tomeu-Vizoso/EC-based-USB-Power-Delivery-support-for-Chrome-machines/20160212-210229
base:   https://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd.git for-mfd-next
config: i386-randconfig-a0-201606 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

>> ERROR: "__moddi3" [drivers/power/cros_usbpd-charger.ko] undefined!

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[-- Attachment #2: .config.gz --]
[-- Type: application/octet-stream, Size: 22106 bytes --]

Re: [PATCH v2 6/8] power: cros_usbpd-charger: Add EC-based USB PD charger driver

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 1009 bytes --]

Hi Sameer,

[auto build test ERROR on ljones-mfd/for-mfd-next]
[also build test ERROR on v4.5-rc3 next-20160212]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Tomeu-Vizoso/EC-based-USB-Power-Delivery-support-for-Chrome-machines/20160212-210229
base:   https://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd.git for-mfd-next
config: arm-multi_v7_defconfig (attached as .config)
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=arm 

All errors (new ones prefixed by >>):

>> ERROR: "__aeabi_ldivmod" [drivers/power/cros_usbpd-charger.ko] undefined!

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[-- Attachment #2: .config.gz --]
[-- Type: application/octet-stream, Size: 36593 bytes --]

Re: [PATCH v2 6/8] power: cros_usbpd-charger: Add EC-based USB PD charger driver

[Stephen Boyd]

On 02/12/2016 04:57 AM, Tomeu Vizoso wrote:
>
>
> diff --git a/drivers/power/cros_usbpd-charger.c b/drivers/power/cros_usbpd-charger.c
> new file mode 100644
> index 000000000000..c1aa58b47f56
> --- /dev/null
> +++ b/drivers/power/cros_usbpd-charger.c
> @@ -0,0 +1,908 @@
> +/*
> + * Power supply driver for ChromeOS EC based USB PD Charger.
> + *
> + * Copyright (c) 2014 Google, Inc
> + *
> + * This software is licensed under the terms of the GNU General Public
> + * License version 2, as published by the Free Software Foundation, and
> + * may be copied, distributed, and modified under those terms.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/fs.h>
> +#include <linux/ktime.h>
> +#include <linux/module.h>
> +#include <linux/mfd/cros_ec.h>
> +#include <linux/mfd/cros_ec_commands.h>
> +#include <linux/platform_device.h>
> +#include <linux/power_supply.h>
> +#include <linux/rtc.h>
> +#include <linux/slab.h>
> +
> +#define CROS_USB_PD_MAX_PORTS		8
> +#define CROS_USB_PD_MAX_LOG_ENTRIES	30
> +
> +#define CROS_USB_PD_LOG_UPDATE_DELAY msecs_to_jiffies(60000)
> +#define CROS_USB_PD_CACHE_UPDATE_DELAY msecs_to_jiffies(500)
> +
> +/* Buffer + macro for building PDLOG string */
> +#define BUF_SIZE 80
> +#define APPEND_STRING(buf, len, str, ...) ((len) += \
> +	snprintf((buf) + (len), max(BUF_SIZE - (len), 0), (str), ##__VA_ARGS__))
> +
> +#define CHARGER_DIR_NAME		"CROS_USB_PD_CHARGER%d"
> +#define CHARGER_DIR_NAME_LENGTH		sizeof(CHARGER_DIR_NAME)
> +
> +#define MANUFACTURER_MODEL_LENGTH	32
> +
> +struct port_data {
> +	int port_number;
> +	char name[CHARGER_DIR_NAME_LENGTH];
> +	char manufacturer[MANUFACTURER_MODEL_LENGTH];
> +	char model_name[MANUFACTURER_MODEL_LENGTH];
> +	struct power_supply *psy;
> +	struct power_supply_desc psy_desc;
> +	int psy_type;
> +	int psy_online;
> +	int psy_status;
> +	int psy_current_max;
> +	int psy_voltage_max_design;
> +	int psy_voltage_now;
> +	int psy_power_max;
> +	struct charger_data *charger;
> +	unsigned long last_update;
> +};
> +
> +struct charger_data {
> +	struct device *dev;
> +	struct cros_ec_dev *ec_dev;
> +	struct cros_ec_device *ec_device;
> +	int num_charger_ports;
> +	int num_registered_psy;
> +	struct port_data *ports[CROS_USB_PD_MAX_PORTS];
> +	struct delayed_work log_work;
> +	struct workqueue_struct *log_workqueue;
> +	struct notifier_block notifier;
> +	bool suspended;
> +};
> +
> +#define EC_MAX_IN_SIZE EC_PROTO2_MAX_REQUEST_SIZE
> +#define EC_MAX_OUT_SIZE EC_PROTO2_MAX_RESPONSE_SIZE
> +uint8_t ec_inbuf[EC_MAX_IN_SIZE];
> +uint8_t ec_outbuf[EC_MAX_OUT_SIZE];

static? Why can't these be part of charger_data?

>
> +
> +static int set_ec_usb_pd_override_ports(struct charger_data *charger,
> +					int port_num)
> +{
> +	struct device *dev = charger->dev;
> +	struct ec_params_charge_port_override req;
> +	int ret;
> +
> +	req.override_port = port_num;
> +
> +	ret = ec_command(charger->ec_dev, 0, EC_CMD_PD_CHARGE_PORT_OVERRIDE,
> +			 (uint8_t *)&req, sizeof(req),
> +			 NULL, 0);
> +	if (ret < 0) {
> +		dev_info(dev, "Port Override command returned 0x%x\n", ret);

dev_err?

> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +
[...]
> +
> +static void cros_usb_pd_print_log_entry(struct ec_response_pd_log *r,
> +					ktime_t tstamp)
> +{
> +	static const char * const fault_names[] = {
> +		"---", "OCP", "fast OCP", "OVP", "Discharge"
> +	};
> +	static const char * const role_names[] = {
> +		"Disconnected", "SRC", "SNK", "SNK (not charging)"
> +	};
> +	static const char * const chg_type_names[] = {
> +		"None", "PD", "Type-C", "Proprietary",
> +		"DCP", "CDP", "SDP", "Other", "VBUS"
> +	};
> +	int i;
> +	int role_idx, type_idx;
> +	const char *fault, *role, *chg_type;
> +	struct usb_chg_measures *meas;
> +	struct mcdp_info *minfo;
> +	struct rtc_time rt;
> +	int len = 0;
> +	char buf[BUF_SIZE + 1];
> +
> +	/* the timestamp is the number of 1024th of seconds in the past */
> +	tstamp = ktime_sub_us(tstamp,
> +		 (uint64_t)r->timestamp << PD_LOG_TIMESTAMP_SHIFT);
> +	rt = rtc_ktime_to_tm(tstamp);
> +
> +	switch (r->type) {
> +	case PD_EVENT_MCU_CHARGE:
> +		if (r->data & CHARGE_FLAGS_OVERRIDE)
> +			APPEND_STRING(buf, len, "override ");
> +		if (r->data & CHARGE_FLAGS_DELAYED_OVERRIDE)
> +			APPEND_STRING(buf, len, "pending_override ");
> +		role_idx = r->data & CHARGE_FLAGS_ROLE_MASK;
> +		role = role_idx < ARRAY_SIZE(role_names) ?
> +			role_names[role_idx] : "Unknown";
> +		type_idx = (r->data & CHARGE_FLAGS_TYPE_MASK)
> +			 >> CHARGE_FLAGS_TYPE_SHIFT;
> +		chg_type = type_idx < ARRAY_SIZE(chg_type_names) ?
> +			chg_type_names[type_idx] : "???";
> +
> +		if ((role_idx == USB_PD_PORT_POWER_DISCONNECTED) ||
> +		    (role_idx == USB_PD_PORT_POWER_SOURCE)) {
> +			APPEND_STRING(buf, len, "%s", role);
> +			break;
> +		}
> +
> +		meas = (struct usb_chg_measures *)r->payload;
> +		APPEND_STRING(buf, len, "%s %s %s %dmV max %dmV / %dmA", role,
> +			r->data & CHARGE_FLAGS_DUAL_ROLE ? "DRP" : "Charger",
> +			chg_type,
> +			meas->voltage_now,
> +			meas->voltage_max,
> +			meas->current_max);
> +		break;
> +	case PD_EVENT_ACC_RW_FAIL:
> +		APPEND_STRING(buf, len, "RW signature check failed");
> +		break;
> +	case PD_EVENT_PS_FAULT:
> +		fault = r->data < ARRAY_SIZE(fault_names) ? fault_names[r->data]
> +							  : "???";
> +		APPEND_STRING(buf, len, "Power supply fault: %s", fault);
> +		break;
> +	case PD_EVENT_VIDEO_DP_MODE:
> +		APPEND_STRING(buf, len, "DP mode %sabled",
> +			      (r->data == 1) ? "en" : "dis");
> +		break;
> +	case PD_EVENT_VIDEO_CODEC:
> +		minfo = (struct mcdp_info *)r->payload;
> +		APPEND_STRING(buf, len,
> +			      "HDMI info: family:%04x chipid:%04x irom:%d.%d.%d fw:%d.%d.%d",
> +			      MCDP_FAMILY(minfo->family),
> +			      MCDP_CHIPID(minfo->chipid),
> +			      minfo->irom.major, minfo->irom.minor,
> +			      minfo->irom.build, minfo->fw.major,
> +			      minfo->fw.minor, minfo->fw.build);
> +		break;
> +	default:
> +		APPEND_STRING(buf, len,
> +			"Event %02x (%04x) [", r->type, r->data);
> +		for (i = 0; i < PD_LOG_SIZE(r->size_port); i++)
> +			APPEND_STRING(buf, len, "%02x ", r->payload[i]);
> +		APPEND_STRING(buf, len, "]");
> +		break;
> +	}
> +
> +	pr_info("PDLOG %d/%02d/%02d %02d:%02d:%02d.%03d P%d %s\n",
> +		rt.tm_year + 1900, rt.tm_mon + 1, rt.tm_mday,
> +		rt.tm_hour, rt.tm_min, rt.tm_sec,
> +		(int)(ktime_to_ms(tstamp) % MSEC_PER_SEC),
> +		PD_LOG_PORT(r->size_port), buf);

Is the kernel log a good place to be putting this information? Maybe
this should go into debugfs?

> +}
> +
> +static void cros_usb_pd_log_check(struct work_struct *work)
> +{
> +	struct charger_data *charger = container_of(to_delayed_work(work),
> +		struct charger_data, log_work);
> +	struct device *dev = charger->dev;
> +	union {
> +		struct ec_response_pd_log r;
> +		uint32_t words[8]; /* space for the payload */
> +	} u;
> +	int ret;
> +	int entries = 0;
> +	ktime_t now;
> +
> +	if (charger->suspended) {
> +		dev_dbg(dev, "Suspended...bailing out\n");
> +		return;
> +	}
> +
> +	while (entries++ < CROS_USB_PD_MAX_LOG_ENTRIES) {
> +		ret = ec_command(charger->ec_dev, 0, EC_CMD_PD_GET_LOG_ENTRY,
> +				 NULL, 0, (uint8_t *)&u, sizeof(u));
> +		now = ktime_get_real();
> +		if (ret < 0) {
> +			dev_dbg(dev, "Cannot get PD log %d\n", ret);
> +			break;
> +		}
> +		if (u.r.type == PD_EVENT_NO_ENTRY)
> +			break;
> +
> +		cros_usb_pd_print_log_entry(&u.r, now);
> +	}
> +
> +	queue_delayed_work(charger->log_workqueue, &charger->log_work,
> +		CROS_USB_PD_LOG_UPDATE_DELAY);
> +}
> +
> +static int cros_usb_pd_ec_event(struct notifier_block *nb,
> +	unsigned long queued_during_suspend, void *_notify)
> +{
> +	struct charger_data *charger;
> +	struct device *dev;
> +	struct cros_ec_device *ec_device;
> +	u32 host_event;
> +
> +	charger = container_of(nb, struct charger_data, notifier);
> +	dev = charger->dev;
> +	ec_device = charger->ec_device;
> +
> +	host_event = cros_ec_get_host_event(ec_device);
> +	if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_PD_MCU)) {
> +		cros_usb_pd_charger_power_changed(charger->ports[0]->psy);
> +		return NOTIFY_OK;
> +	} else {
> +		return NOTIFY_DONE;
> +	}

Simplify to return NOTIFY_DONE without the else.

> +}
> +
> +static char *charger_supplied_to[] = {"cros-usb_pd-charger"};

const?

> +
> +static int cros_usb_pd_charger_probe(struct platform_device *pd)
> +{
> +	struct device *dev = &pd->dev;
> +	struct cros_ec_dev *ec_dev = dev_get_drvdata(pd->dev.parent);
> +	struct cros_ec_device *ec_device;
> +	struct charger_data *charger;
> +	struct port_data *port;
> +	struct power_supply_desc *psy_desc;
> +	struct power_supply_config psy_cfg = {};
> +	int i;
> +	int ret = -EINVAL;
> +
> +	dev_dbg(dev, "cros_usb_pd_charger_probe\n");
> +	if (!ec_dev) {
> +		WARN(1, "%s: No EC dev found\n", dev_name(dev));
> +		return -EINVAL;
> +	}
> +
> +	ec_device = ec_dev->ec_dev;
> +	if (!ec_device) {
> +		WARN(1, "%s: No EC device found\n", dev_name(dev));
> +		return -EINVAL;
> +	}
> +
> +	charger = devm_kzalloc(dev, sizeof(struct charger_data),
> +				    GFP_KERNEL);
> +	if (!charger)
> +		return -ENOMEM;
> +
> +	charger->dev = dev;
> +	charger->ec_dev = ec_dev;
> +	charger->ec_device = ec_device;
> +
> +	platform_set_drvdata(pd, charger);
> +
> +	if ((get_ec_num_ports(charger, &charger->num_charger_ports) < 0) ||
> +	    !charger->num_charger_ports) {
> +		/*
> +		 * This can happen on a system that doesn't support USB PD.
> +		 * Log a message, but no need to warn.
> +		 */
> +		dev_info(dev, "No charging ports found\n");

dev_err?

> +		ret = -ENODEV;
> +		goto fail_nowarn;
> +	}
> +
> +	for (i = 0; i < charger->num_charger_ports; i++) {
> +		port = devm_kzalloc(dev, sizeof(struct port_data), GFP_KERNEL);
> +		if (!port) {
> +			dev_err(dev, "Failed to alloc port structure\n");

We don't need error messages on allocation failures (checkpatch usually
catches this).

> +			ret = -ENOMEM;
> +			goto fail;
> +		}
> +
> +		port->charger = charger;
> +		port->port_number = i;
> +		sprintf(port->name, CHARGER_DIR_NAME, i);
> +
> +		psy_desc = &port->psy_desc;
> +		psy_desc->name = port->name;
> +		psy_desc->type = POWER_SUPPLY_TYPE_USB;
> +		psy_desc->get_property = cros_usb_pd_charger_get_prop;
> +		psy_desc->set_property = cros_usb_pd_charger_set_prop;
> +		psy_desc->property_is_writeable =
> +			cros_usb_pd_charger_is_writeable;
> +		psy_desc->external_power_changed =
> +			cros_usb_pd_charger_power_changed;
> +		psy_desc->properties = cros_usb_pd_charger_props;
> +		psy_desc->num_properties = ARRAY_SIZE(
> +			cros_usb_pd_charger_props);
> +
> +		psy_cfg.drv_data = port;
> +		psy_cfg.supplied_to = charger_supplied_to;
> +		psy_cfg.num_supplicants = ARRAY_SIZE(charger_supplied_to);
> +
> +		port->psy = power_supply_register_no_ws(dev, psy_desc,
> +							&psy_cfg);
> +		if (IS_ERR(port->psy)) {
> +			dev_err(dev, "Failed to register power supply: %ld\n",
> +				PTR_ERR(port->psy));
> +			continue;
> +		}
> +
> +		charger->ports[charger->num_registered_psy++] = port;
> +	}
> +
> +	if (!charger->num_registered_psy) {
> +		ret = -ENODEV;
> +		dev_err(dev, "No power supplies registered\n");
> +		goto fail;
> +	}
> +
> +	if (ec_device->mkbp_event_supported) {
> +		/* Get PD events from the EC */
> +		charger->notifier.notifier_call = cros_usb_pd_ec_event;
> +		ret = blocking_notifier_chain_register(
> +			&ec_device->event_notifier, &charger->notifier);
> +		if (ret < 0)
> +			dev_warn(dev, "failed to register notifier\n");
> +	}
> +
> +	/* Retrieve PD event logs periodically */
> +	INIT_DELAYED_WORK(&charger->log_work, cros_usb_pd_log_check);
> +	charger->log_workqueue =
> +		create_singlethread_workqueue("cros_usb_pd_log");
> +	queue_delayed_work(charger->log_workqueue, &charger->log_work,
> +		CROS_USB_PD_LOG_UPDATE_DELAY);
> +
> +	return 0;
> +
> +fail:
> +	WARN(1, "%s: Failing probe (err:0x%x)\n", dev_name(dev), ret);
> +
> +fail_nowarn:
> +	if (charger) {

This is always true?

> +		for (i = 0; i < charger->num_registered_psy; i++) {
> +			port = charger->ports[i];
> +			power_supply_unregister(port->psy);
> +			devm_kfree(dev, port);
> +		}
> +		platform_set_drvdata(pd, NULL);
> +		devm_kfree(dev, charger);

Seems like we could let devres take care of this.

> +	}
> +
> +	dev_info(dev, "Failing probe (err:0x%x)\n", ret);

Is this necessary? Doesn't driver core already spew something out for
this case if some debugging flag is enabled?

> +	return ret;
> +}
> +
> +static int cros_usb_pd_charger_remove(struct platform_device *pd)
> +{
> +	struct charger_data *charger = platform_get_drvdata(pd);
> +	struct device *dev = charger->dev;
> +	struct port_data *port;
> +	int i;
> +
> +	if (charger) {

We just derefed charger a few lines up.

> +		for (i = 0; i < charger->num_registered_psy; i++) {
> +			port = charger->ports[i];
> +			power_supply_unregister(port->psy);
> +			devm_kfree(dev, port);

Can't we let driver removal take care of this?

> +		}
> +		flush_delayed_work(&charger->log_work);
> +		platform_set_drvdata(pd, NULL);

This is not needed.

> +		devm_kfree(dev, charger);

Again, driver remove already does this?

> +	}
> +	return 0;
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int cros_usb_pd_charger_resume(struct device *dev)
> +{
> +	struct charger_data *charger = dev_get_drvdata(dev);
> +	int i;
> +
> +	if (!charger)
> +		return 0;

Seems sort of impossible...

> +
> +	charger->suspended = false;
> +
> +	dev_dbg(dev, "cros_usb_pd_charger_resume: updating power supplies\n");
> +	for (i = 0; i < charger->num_registered_psy; i++) {
> +		power_supply_changed(charger->ports[i]->psy);
> +		charger->ports[i]->last_update =
> +				jiffies - CROS_USB_PD_CACHE_UPDATE_DELAY;
> +	}
> +	queue_delayed_work(charger->log_workqueue, &charger->log_work,
> +		CROS_USB_PD_LOG_UPDATE_DELAY);
> +
> +	return 0;
> +}
> +
> +static int cros_usb_pd_charger_suspend(struct device *dev)
> +{
> +	struct charger_data *charger = dev_get_drvdata(dev);
> +
> +	charger->suspended = true;
> +
> +	if (charger)

We just derefed charger so it better be non-NULL

> +		flush_delayed_work(&charger->log_work);
> +	return 0;
> +}
> +#endif
> +
> +static int set_ec_ext_power_limit(struct cros_ec_dev *ec,
> +				  uint16_t current_lim, uint16_t voltage_lim)
> +{
> +	struct ec_params_external_power_limit_v1 req;
> +	int ret;
> +
> +	req.current_lim = current_lim;
> +	req.voltage_lim = voltage_lim;
> +
> +	ret = ec_command(ec, 0, EC_CMD_EXT_POWER_CURRENT_LIMIT,
> +			 (uint8_t *)&req, sizeof(req), NULL, 0);
> +	if (ret < 0) {
> +		dev_warn(ec->dev,
> +			 "External power limit command returned 0x%x\n",
> +			 ret);

dev_err?

> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static ssize_t get_ec_ext_current_lim(struct device *dev,
> +				      struct device_attribute *attr,
> +				      char *buf)
> +{
> +	return scnprintf(buf, PAGE_SIZE, "%d\n", ext_current_lim);
> +}
> +
> +static ssize_t set_ec_ext_current_lim(struct device *dev,
> +				      struct device_attribute *attr,
> +				      const char *buf, size_t count)
> +{
> +	int ret;
> +	uint16_t tmp_val;
> +	struct cros_ec_dev *ec = container_of(
> +			dev, struct cros_ec_dev, class_dev);
> +
> +	if (kstrtou16(buf, 0, &tmp_val) < 0)
> +		return -EINVAL;
> +
> +	ret = set_ec_ext_power_limit(ec, tmp_val, ext_voltage_lim);
> +	if (ret < 0)
> +		return ret;
> +
> +	ext_current_lim = tmp_val;
> +	if (ext_current_lim == EC_POWER_LIMIT_NONE)
> +		dev_info(ec->dev, "External current limit removed\n");
> +	else
> +		dev_info(ec->dev, "External current limit set to %dmA\n",
> +			 ext_current_lim);

Why are we dev_info printing on sysfs writes?

> +
> +	return count;
> +}
> +
> +static ssize_t get_ec_ext_voltage_lim(struct device *dev,
> +				      struct device_attribute *attr,
> +				      char *buf)
> +{
> +	return scnprintf(buf, PAGE_SIZE, "%d\n", ext_voltage_lim);
> +}
> +
> +static ssize_t set_ec_ext_voltage_lim(struct device *dev,
> +				      struct device_attribute *attr,
> +				      const char *buf, size_t count)
> +{
> +	int ret;
> +	uint16_t tmp_val;
> +
> +	struct cros_ec_dev *ec = container_of(
> +			dev, struct cros_ec_dev, class_dev);
> +
> +	if (kstrtou16(buf, 0, &tmp_val) < 0)
> +		return -EINVAL;
> +
> +	ret = set_ec_ext_power_limit(ec, ext_current_lim, tmp_val);
> +	if (ret < 0)
> +		return ret;
> +
> +	ext_voltage_lim = tmp_val;
> +	if (ext_voltage_lim == EC_POWER_LIMIT_NONE)
> +		dev_info(ec->dev, "External voltage limit removed\n");
> +	else
> +		dev_info(ec->dev, "External voltage limit set to %dmV\n",
> +			 ext_voltage_lim);

Again...

> +
> +	return count;
> +}
> +
> +static DEVICE_ATTR(ext_current_lim, S_IWUSR | S_IWGRP | S_IRUGO,
> +		   get_ec_ext_current_lim,
> +		   set_ec_ext_current_lim);
> +static DEVICE_ATTR(ext_voltage_lim, S_IWUSR | S_IWGRP | S_IRUGO,
> +		   get_ec_ext_voltage_lim,
> +		   set_ec_ext_voltage_lim);

Any documentation for these in Documentation/ABI?

> +
> +static struct attribute *__ext_power_cmds_attrs[] = {
> +	&dev_attr_ext_current_lim.attr,
> +	&dev_attr_ext_voltage_lim.attr,
> +	NULL,
> +};
> +
> +struct attribute_group cros_usb_pd_charger_attr_group = {

static?

> +	.name = "usb-pd-charger",
> +	.attrs = __ext_power_cmds_attrs,
> +};
> +
> +static SIMPLE_DEV_PM_OPS(cros_usb_pd_charger_pm_ops,
> +	cros_usb_pd_charger_suspend, cros_usb_pd_charger_resume);

const?

> +
> +static struct platform_driver cros_usb_pd_charger_driver = {
> +	.driver = {
> +		.name = "cros-usb-pd-charger",
> +		.owner = THIS_MODULE,

This isn't needed anymore.

> +		.pm = &cros_usb_pd_charger_pm_ops,
> +	},
> +	.probe = cros_usb_pd_charger_probe,
> +	.remove = cros_usb_pd_charger_remove,
> +};
> +
> +module_platform_driver(cros_usb_pd_charger_driver);
>
-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

Re: [PATCH v2 6/8] power: cros_usbpd-charger: Add EC-based USB PD charger driver

[Tomeu Vizoso]

On 13 February 2016 at 01:46, Stephen Boyd <sboyd@codeaurora.org> wrote:
> On 02/12/2016 04:57 AM, Tomeu Vizoso wrote:
>> +
>> +#define EC_MAX_IN_SIZE EC_PROTO2_MAX_REQUEST_SIZE
>> +#define EC_MAX_OUT_SIZE EC_PROTO2_MAX_RESPONSE_SIZE
>> +uint8_t ec_inbuf[EC_MAX_IN_SIZE];
>> +uint8_t ec_outbuf[EC_MAX_OUT_SIZE];
>
> static? Why can't these be part of charger_data?

Actually, I don't think we need any of that pre-allocation.

>> +static int set_ec_usb_pd_override_ports(struct charger_data *charger,
>> +                                     int port_num)
>> +{
>> +     struct device *dev = charger->dev;
>> +     struct ec_params_charge_port_override req;
>> +     int ret;
>> +
>> +     req.override_port = port_num;
>> +
>> +     ret = ec_command(charger->ec_dev, 0, EC_CMD_PD_CHARGE_PORT_OVERRIDE,
>> +                      (uint8_t *)&req, sizeof(req),
>> +                      NULL, 0);
>> +     if (ret < 0) {
>> +             dev_info(dev, "Port Override command returned 0x%x\n", ret);
>
> dev_err?

Sounds good.

>> +     pr_info("PDLOG %d/%02d/%02d %02d:%02d:%02d.%03d P%d %s\n",
>> +             rt.tm_year + 1900, rt.tm_mon + 1, rt.tm_mday,
>> +             rt.tm_hour, rt.tm_min, rt.tm_sec,
>> +             (int)(ktime_to_ms(tstamp) % MSEC_PER_SEC),
>> +             PD_LOG_PORT(r->size_port), buf);
>
> Is the kernel log a good place to be putting this information? Maybe
> this should go into debugfs?

It should be really sparse and it has already proved useful to users
willing to know if their Type-C cables are broken.We could also make
it dev_dbg.

http://www.ibtimes.co.uk/googler-shows-how-test-compatibility-usb-c-cable-chromebook-pixel-2015-1527334

>> +             return NOTIFY_OK;
>> +     } else {
>> +             return NOTIFY_DONE;
>> +     }
>
> Simplify to return NOTIFY_DONE without the else.

Ok.

>> +}
>> +
>> +static char *charger_supplied_to[] = {"cros-usb_pd-charger"};
>
> const?

In principle yes, but power_supply_config.supplied_to isn't const.

>> +         !charger->num_charger_ports) {
>> +             /*
>> +              * This can happen on a system that doesn't support USB PD.
>> +              * Log a message, but no need to warn.
>> +              */
>> +             dev_info(dev, "No charging ports found\n");
>
> dev_err?

I think so, but will also need to make sure that we only register a
device if we have one or more charging port.

>> +             ret = -ENODEV;
>> +             goto fail_nowarn;
>> +     }
>> +
>> +     for (i = 0; i < charger->num_charger_ports; i++) {
>> +             port = devm_kzalloc(dev, sizeof(struct port_data), GFP_KERNEL);
>> +             if (!port) {
>> +                     dev_err(dev, "Failed to alloc port structure\n");
>
> We don't need error messages on allocation failures (checkpatch usually
> catches this).

It did catch another one in this file, not sure why it failed here.

>> +
>> +fail_nowarn:
>> +     if (charger) {
>
> This is always true?

Ah, yes.

>> +             for (i = 0; i < charger->num_registered_psy; i++) {
>> +                     port = charger->ports[i];
>> +                     power_supply_unregister(port->psy);
>> +                     devm_kfree(dev, port);
>> +             }
>> +             platform_set_drvdata(pd, NULL);
>> +             devm_kfree(dev, charger);
>
> Seems like we could let devres take care of this.

Indeed.

>> +     }
>> +
>> +     dev_info(dev, "Failing probe (err:0x%x)\n", ret);
>
> Is this necessary? Doesn't driver core already spew something out for
> this case if some debugging flag is enabled?

True, a warning is printed.

>> +     return ret;
>> +}
>> +
>> +static int cros_usb_pd_charger_remove(struct platform_device *pd)
>> +{
>> +     struct charger_data *charger = platform_get_drvdata(pd);
>> +     struct device *dev = charger->dev;
>> +     struct port_data *port;
>> +     int i;
>> +
>> +     if (charger) {
>
> We just derefed charger a few lines up.

Ok.

>> +             for (i = 0; i < charger->num_registered_psy; i++) {
>> +                     port = charger->ports[i];
>> +                     power_supply_unregister(port->psy);
>> +                     devm_kfree(dev, port);
>
> Can't we let driver removal take care of this?

Ok.

>> +             }
>> +             flush_delayed_work(&charger->log_work);
>> +             platform_set_drvdata(pd, NULL);
>
> This is not needed.

Ok.

>> +             devm_kfree(dev, charger);
>
> Again, driver remove already does this?

Yup.

>> +     }
>> +     return 0;
>> +}
>> +
>> +#ifdef CONFIG_PM_SLEEP
>> +static int cros_usb_pd_charger_resume(struct device *dev)
>> +{
>> +     struct charger_data *charger = dev_get_drvdata(dev);
>> +     int i;
>> +
>> +     if (!charger)
>> +             return 0;
>
> Seems sort of impossible...

True.

>> +
>> +     charger->suspended = false;
>> +
>> +     dev_dbg(dev, "cros_usb_pd_charger_resume: updating power supplies\n");
>> +     for (i = 0; i < charger->num_registered_psy; i++) {
>> +             power_supply_changed(charger->ports[i]->psy);
>> +             charger->ports[i]->last_update =
>> +                             jiffies - CROS_USB_PD_CACHE_UPDATE_DELAY;
>> +     }
>> +     queue_delayed_work(charger->log_workqueue, &charger->log_work,
>> +             CROS_USB_PD_LOG_UPDATE_DELAY);
>> +
>> +     return 0;
>> +}
>> +
>> +static int cros_usb_pd_charger_suspend(struct device *dev)
>> +{
>> +     struct charger_data *charger = dev_get_drvdata(dev);
>> +
>> +     charger->suspended = true;
>> +
>> +     if (charger)
>
> We just derefed charger so it better be non-NULL

Yup.

>> +     ret = ec_command(ec, 0, EC_CMD_EXT_POWER_CURRENT_LIMIT,
>> +                      (uint8_t *)&req, sizeof(req), NULL, 0);
>> +     if (ret < 0) {
>> +             dev_warn(ec->dev,
>> +                      "External power limit command returned 0x%x\n",
>> +                      ret);
>
> dev_err?

Sounds good to me.

>> +     if (ext_current_lim == EC_POWER_LIMIT_NONE)
>> +             dev_info(ec->dev, "External current limit removed\n");
>> +     else
>> +             dev_info(ec->dev, "External current limit set to %dmA\n",
>> +                      ext_current_lim);
>
> Why are we dev_info printing on sysfs writes?

Cannot think of a good reason, so I'm changing those to dev_dbg.

>> +     ext_voltage_lim = tmp_val;
>> +     if (ext_voltage_lim == EC_POWER_LIMIT_NONE)
>> +             dev_info(ec->dev, "External voltage limit removed\n");
>> +     else
>> +             dev_info(ec->dev, "External voltage limit set to %dmV\n",
>> +                      ext_voltage_lim);
>
> Again...

Ok.

>> +
>> +     return count;
>> +}
>> +
>> +static DEVICE_ATTR(ext_current_lim, S_IWUSR | S_IWGRP | S_IRUGO,
>> +                get_ec_ext_current_lim,
>> +                set_ec_ext_current_lim);
>> +static DEVICE_ATTR(ext_voltage_lim, S_IWUSR | S_IWGRP | S_IRUGO,
>> +                get_ec_ext_voltage_lim,
>> +                set_ec_ext_voltage_lim);
>
> Any documentation for these in Documentation/ABI?

Will add.

>> +static struct attribute *__ext_power_cmds_attrs[] = {
>> +     &dev_attr_ext_current_lim.attr,
>> +     &dev_attr_ext_voltage_lim.attr,
>> +     NULL,
>> +};
>> +
>> +struct attribute_group cros_usb_pd_charger_attr_group = {
>
> static?

Not really, as it's to be used externally.

>> +     .name = "usb-pd-charger",
>> +     .attrs = __ext_power_cmds_attrs,
>> +};
>> +
>> +static SIMPLE_DEV_PM_OPS(cros_usb_pd_charger_pm_ops,
>> +     cros_usb_pd_charger_suspend, cros_usb_pd_charger_resume);
>
> const?

The macro already has the const keyword.

>> +
>> +static struct platform_driver cros_usb_pd_charger_driver = {
>> +     .driver = {
>> +             .name = "cros-usb-pd-charger",
>> +             .owner = THIS_MODULE,
>
> This isn't needed anymore.

Ok.

Thank you very much for the great review!

Tomeu

Re: [PATCH v2 0/8] EC-based USB Power Delivery support for Chrome machines

[Pavel Machek]

Hi!

> this series contains a driver that exposes a power_supply to userspace
> representing a port that support USB PD charging.

Well, if this is meant for userspace, should it add some
documentation, too?

Thanks,
								Pavel
								
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

Re: [PATCH v2 0/8] EC-based USB Power Delivery support for Chrome machines

[Tomeu Vizoso]

On 20 February 2016 at 17:22, Pavel Machek <pavel@ucw.cz> wrote:
> Hi!
>
>> this series contains a driver that exposes a power_supply to userspace
>> representing a port that support USB PD charging.
>
> Well, if this is meant for userspace, should it add some
> documentation, too?

Hi Pavel, in v3 I have dropped any new sysfs attributes, so everything
exposed to userspace is already documented.

Thanks,

Tomeu

> Thanks,
>                                                                 Pavel
>
> --
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html