[PATCH v6 5/7] leds: Add driver for ASUS Transformer LEDs

[Svyatoslav Ryhel <clamor95@gmail.com>]

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 f4a0a3c8c870..f637d23400a8 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