leds: Add driver for Acer Iconia Tab A500 (1ece06ac) · Commits · 戴 / test

drivers/leds/Kconfig

+7 −0

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		@@ -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"

drivers/leds/Makefile

+1 −0

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		@@ -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

drivers/leds/leds-acer-a500.c

0 → 100644

+129 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0+

		#include <linux/leds.h>
		#include <linux/module.h>
		#include <linux/platform_device.h>
		#include <linux/regmap.h>

		#define A500_EC_LED_DELAY_USEC (100 * 1000)

		enum {
		REG_RESET_LEDS = 0x40,
		REG_POWER_LED_ON = 0x42,
		REG_CHARGE_LED_ON = 0x43,
		REG_ANDROID_LEDS_OFF = 0x5a,
		};

		struct a500_led {
		struct led_classdev cdev;
		const struct reg_sequence *enable_seq;
		struct a500_led *other;
		struct regmap *rmap;
		};

		static const struct reg_sequence a500_ec_leds_reset_seq[] = {
		REG_SEQ(REG_RESET_LEDS, 0x0, A500_EC_LED_DELAY_USEC),
		REG_SEQ(REG_ANDROID_LEDS_OFF, 0x0, A500_EC_LED_DELAY_USEC),
		};

		static const struct reg_sequence a500_ec_white_led_enable_seq[] = {
		REG_SEQ(REG_POWER_LED_ON, 0x0, A500_EC_LED_DELAY_USEC),
		};

		static const struct reg_sequence a500_ec_orange_led_enable_seq[] = {
		REG_SEQ(REG_CHARGE_LED_ON, 0x0, A500_EC_LED_DELAY_USEC),
		};

		static int a500_ec_led_brightness_set(struct led_classdev *led_cdev,
		enum led_brightness value)
		{
		struct a500_led *led = container_of(led_cdev, struct a500_led, cdev);
		struct reg_sequence control_seq[2];
		unsigned int num_regs = 1;

		if (value) {
		control_seq[0] = led->enable_seq[0];
		} else {
		/*
		* There is no separate controls which can disable LEDs
		* individually, there is only RESET_LEDS command that turns
		* off both LEDs.
		*
		* RESET_LEDS turns off both LEDs, thus restore other LED if
		* it's turned ON.
		*/
		if (led->other->cdev.brightness)
		num_regs = 2;

		control_seq[0] = a500_ec_leds_reset_seq[0];
		control_seq[1] = led->other->enable_seq[0];
		}

		return regmap_multi_reg_write(led->rmap, control_seq, num_regs);
		}

		static int a500_ec_leds_probe(struct platform_device *pdev)
		{
		struct a500_led white_led, orange_led;
		struct regmap *rmap;
		int err;

		rmap = dev_get_regmap(pdev->dev.parent, "KB930");
		if (!rmap)
		return -EINVAL;

		/* reset and turn off LEDs */
		regmap_multi_reg_write(rmap, a500_ec_leds_reset_seq, 2);

		white_led = devm_kzalloc(&pdev->dev, sizeof(*white_led), GFP_KERNEL);
		if (!white_led)
		return -ENOMEM;

		white_led->cdev.name = "power:white";
		white_led->cdev.brightness_set_blocking = a500_ec_led_brightness_set;
		white_led->cdev.flags = LED_CORE_SUSPENDRESUME;
		white_led->cdev.max_brightness = 1;
		white_led->enable_seq = a500_ec_white_led_enable_seq;
		white_led->rmap = rmap;

		orange_led = devm_kzalloc(&pdev->dev, sizeof(*orange_led), GFP_KERNEL);
		if (!orange_led)
		return -ENOMEM;

		orange_led->cdev.name = "power:orange";
		orange_led->cdev.brightness_set_blocking = a500_ec_led_brightness_set;
		orange_led->cdev.flags = LED_CORE_SUSPENDRESUME;
		orange_led->cdev.max_brightness = 1;
		orange_led->enable_seq = a500_ec_orange_led_enable_seq;
		orange_led->rmap = rmap;

		white_led->other = orange_led;
		orange_led->other = 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");

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