[PATCH v1 3/6] leds: Add driver for Acer Iconia Tab A500

[Dmitry Osipenko <digetx@gmail.com>]

Acer Iconia Tab A500 is an Android tablet device which has two LEDs
embedded into the Power Button. Orange LED indicates "battery charging"
status and white LED indicates "wake-up/charge-done" status. The new LED
driver provides control over both LEDs to userspace.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/leds/Kconfig          |   7 ++
 drivers/leds/Makefile         |   1 +
 drivers/leds/leds-acer-a500.c | 121 ++++++++++++++++++++++++++++++++++
 3 files changed, 129 insertions(+)
 create mode 100644 drivers/leds/leds-acer-a500.c

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 4f6464a169d5..4c39b53bcf1f 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -921,6 +921,13 @@ config LEDS_SGM3140
 	  This option enables support for the SGM3140 500mA Buck/Boost Charge
 	  Pump LED Driver.
 
+config LEDS_ACER_A500
+	tristate "Power button LED support for Acer Iconia Tab A500"
+	depends on LEDS_CLASS && MFD_ACER_A500_EC
+	help
+	  This option enables support for the Power Button LED of
+	  Acer Iconia Tab A500.
+
 comment "LED Triggers"
 source "drivers/leds/trigger/Kconfig"
 
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 778cb4bb8c52..73e603e1727e 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_LEDS_TRIGGERS)		+= led-triggers.o
 # LED Platform Drivers (keep this sorted, M-| sort)
 obj-$(CONFIG_LEDS_88PM860X)		+= leds-88pm860x.o
 obj-$(CONFIG_LEDS_AAT1290)		+= leds-aat1290.o
+obj-$(CONFIG_LEDS_ACER_A500)		+= leds-acer-a500.o
 obj-$(CONFIG_LEDS_ADP5520)		+= leds-adp5520.o
 obj-$(CONFIG_LEDS_AN30259A)		+= leds-an30259a.o
 obj-$(CONFIG_LEDS_APU)			+= leds-apu.o
diff --git a/drivers/leds/leds-acer-a500.c b/drivers/leds/leds-acer-a500.c
new file mode 100644
index 000000000000..65e69a40a91a
--- /dev/null
+++ b/drivers/leds/leds-acer-a500.c
@@ -0,0 +1,121 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Power button LED driver for Acer Iconia Tab A500.
+ *
+ * Copyright 2020 GRATE-driver project.
+ */
+
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <linux/mfd/acer-ec-a500.h>
+
+struct a500_ec_led {
+	struct led_classdev cdev;
+	struct a500_ec_led *other_led;
+	const struct a500_ec_cmd *cmd;
+};
+
+/*					cmd	delay ms */
+A500_EC_COMMAND(RESET_LEDS,		0x40,	100);
+A500_EC_COMMAND(POWER_LED_ON,		0x42,	100);
+A500_EC_COMMAND(CHARGE_LED_ON,		0x43,	100);
+A500_EC_COMMAND(ANDROID_LEDS_OFF,	0x5A,	100);
+
+static int a500_ec_led_brightness_set(struct led_classdev *led_cdev,
+				      enum led_brightness value)
+{
+	struct device *a500_ec_leds_dev = led_cdev->dev->parent;
+	struct a500_ec *ec_chip = dev_get_drvdata(a500_ec_leds_dev->parent);
+	struct a500_ec_led *led = container_of(led_cdev, struct a500_ec_led,
+					       cdev);
+	int ret;
+
+	a500_ec_lock(ec_chip);
+
+	if (value) {
+		ret = a500_ec_write_locked(ec_chip, led->cmd, 0);
+	} else {
+		/*
+		 * There is no separate controls which can disable LEDs
+		 * individually, there is only RESET_LEDS command that turns
+		 * off both LEDs.
+		 */
+		ret = a500_ec_write_locked(ec_chip, RESET_LEDS, 0);
+		if (ret)
+			goto unlock;
+
+		led = led->other_led;
+
+		/* RESET_LEDS turns off both LEDs, thus restore other LED */
+		if (led->cdev.brightness == LED_ON)
+			ret = a500_ec_write_locked(ec_chip, led->cmd, 0);
+	}
+
+unlock:
+	a500_ec_unlock(ec_chip);
+
+	return ret;
+}
+
+static int a500_ec_leds_probe(struct platform_device *pdev)
+{
+	struct a500_ec *ec_chip = dev_get_drvdata(pdev->dev.parent);
+	struct a500_ec_led *white_led, *orange_led;
+	int err;
+
+	/* reset and turn off all LEDs */
+	a500_ec_write(ec_chip, RESET_LEDS, 0);
+	a500_ec_write(ec_chip, ANDROID_LEDS_OFF, 0);
+
+	white_led = devm_kzalloc(&pdev->dev, sizeof(*white_led), GFP_KERNEL);
+	if (!white_led)
+		return -ENOMEM;
+
+	white_led->cdev.name = "power-button-white";
+	white_led->cdev.brightness_set_blocking = a500_ec_led_brightness_set;
+	white_led->cdev.flags = LED_CORE_SUSPENDRESUME;
+	white_led->cdev.max_brightness = LED_ON;
+	white_led->cmd = &A500_EC_POWER_LED_ON;
+
+	orange_led = devm_kzalloc(&pdev->dev, sizeof(*orange_led), GFP_KERNEL);
+	if (!orange_led)
+		return -ENOMEM;
+
+	orange_led->cdev.name = "power-button-orange";
+	orange_led->cdev.brightness_set_blocking = a500_ec_led_brightness_set;
+	orange_led->cdev.flags = LED_CORE_SUSPENDRESUME;
+	orange_led->cdev.max_brightness = LED_ON;
+	orange_led->cmd = &A500_EC_CHARGE_LED_ON;
+
+	white_led->other_led = orange_led;
+	orange_led->other_led = white_led;
+
+	err = devm_led_classdev_register(&pdev->dev, &white_led->cdev);
+	if (err) {
+		dev_err(&pdev->dev, "failed to register white LED\n");
+		return err;
+	}
+
+	err = devm_led_classdev_register(&pdev->dev, &orange_led->cdev);
+	if (err) {
+		dev_err(&pdev->dev, "failed to register orange LED\n");
+		return err;
+	}
+
+	return 0;
+}
+
+static struct platform_driver a500_ec_leds_driver = {
+	.driver = {
+		.name = "acer-a500-iconia-leds",
+	},
+	.probe = a500_ec_leds_probe,
+};
+module_platform_driver(a500_ec_leds_driver);
+
+MODULE_DESCRIPTION("LED driver for Acer Iconia Tab A500 Power Button");
+MODULE_AUTHOR("Dmitry Osipenko <digetx@gmail.com>");
+MODULE_ALIAS("platform:acer-a500-iconia-leds");
+MODULE_LICENSE("GPL v2");
-- 
2.27.0