drivers/leds/leds-max8997.c - kernel/quantenna - Git at Google

 /*
  * leds-max8997.c - LED class driver for MAX8997 LEDs.
  *
  * Copyright (C) 2011 Samsung Electronics
  * Donggeun Kim <dg77.kim@samsung.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  *
  */

 #include <linux/module.h>
 #include <linux/err.h>
 #include <linux/slab.h>
 #include <linux/leds.h>
 #include <linux/mfd/max8997.h>
 #include <linux/mfd/max8997-private.h>
 #include <linux/platform_device.h>

 #define MAX8997_LED_FLASH_SHIFT			3
 #define MAX8997_LED_FLASH_CUR_MASK		0xf8
 #define MAX8997_LED_MOVIE_SHIFT			4
 #define MAX8997_LED_MOVIE_CUR_MASK		0xf0

 #define MAX8997_LED_FLASH_MAX_BRIGHTNESS	0x1f
 #define MAX8997_LED_MOVIE_MAX_BRIGHTNESS	0xf
 #define MAX8997_LED_NONE_MAX_BRIGHTNESS		0

 #define MAX8997_LED0_FLASH_MASK			0x1
 #define MAX8997_LED0_FLASH_PIN_MASK		0x5
 #define MAX8997_LED0_MOVIE_MASK			0x8
 #define MAX8997_LED0_MOVIE_PIN_MASK		0x28

 #define MAX8997_LED1_FLASH_MASK			0x2
 #define MAX8997_LED1_FLASH_PIN_MASK		0x6
 #define MAX8997_LED1_MOVIE_MASK			0x10
 #define MAX8997_LED1_MOVIE_PIN_MASK		0x30

 #define MAX8997_LED_BOOST_ENABLE_MASK		(1 << 6)

 struct max8997_led {
 	struct max8997_dev *iodev;
 	struct led_classdev cdev;
 	bool enabled;
 	int id;
 	enum max8997_led_mode led_mode;
 	struct mutex mutex;
 };

 static void max8997_led_set_mode(struct max8997_led *led,
 			enum max8997_led_mode mode)
 {
 	int ret;
 	struct i2c_client *client = led->iodev->i2c;
 	u8 mask = 0, val;

 	switch (mode) {
 	case MAX8997_FLASH_MODE:
 		mask = MAX8997_LED1_FLASH_MASK | MAX8997_LED0_FLASH_MASK;
 		val = led->id ?
 		      MAX8997_LED1_FLASH_MASK : MAX8997_LED0_FLASH_MASK;
 		led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS;
 		break;
 	case MAX8997_MOVIE_MODE:
 		mask = MAX8997_LED1_MOVIE_MASK | MAX8997_LED0_MOVIE_MASK;
 		val = led->id ?
 		      MAX8997_LED1_MOVIE_MASK : MAX8997_LED0_MOVIE_MASK;
 		led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS;
 		break;
 	case MAX8997_FLASH_PIN_CONTROL_MODE:
 		mask = MAX8997_LED1_FLASH_PIN_MASK |
 		       MAX8997_LED0_FLASH_PIN_MASK;
 		val = led->id ?
 		      MAX8997_LED1_FLASH_PIN_MASK : MAX8997_LED0_FLASH_PIN_MASK;
 		led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS;
 		break;
 	case MAX8997_MOVIE_PIN_CONTROL_MODE:
 		mask = MAX8997_LED1_MOVIE_PIN_MASK |
 		       MAX8997_LED0_MOVIE_PIN_MASK;
 		val = led->id ?
 		      MAX8997_LED1_MOVIE_PIN_MASK : MAX8997_LED0_MOVIE_PIN_MASK;
 		led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS;
 		break;
 	default:
 		led->cdev.max_brightness = MAX8997_LED_NONE_MAX_BRIGHTNESS;
 		break;
 	}

 	if (mask) {
 		ret = max8997_update_reg(client, MAX8997_REG_LEN_CNTL, val,
 					 mask);
 		if (ret)
 			dev_err(led->iodev->dev,
 				"failed to update register(%d)\n", ret);
 	}

 	led->led_mode = mode;
 }

 static void max8997_led_enable(struct max8997_led *led, bool enable)
 {
 	int ret;
 	struct i2c_client *client = led->iodev->i2c;
 	u8 val = 0, mask = MAX8997_LED_BOOST_ENABLE_MASK;

 	if (led->enabled == enable)
 		return;

 	val = enable ? MAX8997_LED_BOOST_ENABLE_MASK : 0;

 	ret = max8997_update_reg(client, MAX8997_REG_BOOST_CNTL, val, mask);
 	if (ret)
 		dev_err(led->iodev->dev,
 			"failed to update register(%d)\n", ret);

 	led->enabled = enable;
 }

 static void max8997_led_set_current(struct max8997_led *led,
 				enum led_brightness value)
 {
 	int ret;
 	struct i2c_client *client = led->iodev->i2c;
 	u8 val = 0, mask = 0, reg = 0;

 	switch (led->led_mode) {
 	case MAX8997_FLASH_MODE:
 	case MAX8997_FLASH_PIN_CONTROL_MODE:
 		val = value << MAX8997_LED_FLASH_SHIFT;
 		mask = MAX8997_LED_FLASH_CUR_MASK;
 		reg = led->id ? MAX8997_REG_FLASH2_CUR : MAX8997_REG_FLASH1_CUR;
 		break;
 	case MAX8997_MOVIE_MODE:
 	case MAX8997_MOVIE_PIN_CONTROL_MODE:
 		val = value << MAX8997_LED_MOVIE_SHIFT;
 		mask = MAX8997_LED_MOVIE_CUR_MASK;
 		reg = MAX8997_REG_MOVIE_CUR;
 		break;
 	default:
 		break;
 	}

 	if (mask) {
 		ret = max8997_update_reg(client, reg, val, mask);
 		if (ret)
 			dev_err(led->iodev->dev,
 				"failed to update register(%d)\n", ret);
 	}
 }

 static void max8997_led_brightness_set(struct led_classdev *led_cdev,
 				enum led_brightness value)
 {
 	struct max8997_led *led =
 			container_of(led_cdev, struct max8997_led, cdev);

 	if (value) {
 		max8997_led_set_current(led, value);
 		max8997_led_enable(led, true);
 	} else {
 		max8997_led_set_current(led, value);
 		max8997_led_enable(led, false);
 	}
 }

 static ssize_t max8997_led_show_mode(struct device *dev,
 				struct device_attribute *attr, char *buf)
 {
 	struct led_classdev *led_cdev = dev_get_drvdata(dev);
 	struct max8997_led *led =
 			container_of(led_cdev, struct max8997_led, cdev);
 	ssize_t ret = 0;

 	mutex_lock(&led->mutex);

 	switch (led->led_mode) {
 	case MAX8997_FLASH_MODE:
 		ret += sprintf(buf, "FLASH\n");
 		break;
 	case MAX8997_MOVIE_MODE:
 		ret += sprintf(buf, "MOVIE\n");
 		break;
 	case MAX8997_FLASH_PIN_CONTROL_MODE:
 		ret += sprintf(buf, "FLASH_PIN_CONTROL\n");
 		break;
 	case MAX8997_MOVIE_PIN_CONTROL_MODE:
 		ret += sprintf(buf, "MOVIE_PIN_CONTROL\n");
 		break;
 	default:
 		ret += sprintf(buf, "NONE\n");
 		break;
 	}

 	mutex_unlock(&led->mutex);

 	return ret;
 }

 static ssize_t max8997_led_store_mode(struct device *dev,
 				struct device_attribute *attr,
 				const char *buf, size_t size)
 {
 	struct led_classdev *led_cdev = dev_get_drvdata(dev);
 	struct max8997_led *led =
 			container_of(led_cdev, struct max8997_led, cdev);
 	enum max8997_led_mode mode;

 	mutex_lock(&led->mutex);

 	if (!strncmp(buf, "FLASH_PIN_CONTROL", 17))
 		mode = MAX8997_FLASH_PIN_CONTROL_MODE;
 	else if (!strncmp(buf, "MOVIE_PIN_CONTROL", 17))
 		mode = MAX8997_MOVIE_PIN_CONTROL_MODE;
 	else if (!strncmp(buf, "FLASH", 5))
 		mode = MAX8997_FLASH_MODE;
 	else if (!strncmp(buf, "MOVIE", 5))
 		mode = MAX8997_MOVIE_MODE;
 	else
 		mode = MAX8997_NONE;

 	max8997_led_set_mode(led, mode);

 	mutex_unlock(&led->mutex);

 	return size;
 }

 static DEVICE_ATTR(mode, 0644, max8997_led_show_mode, max8997_led_store_mode);

 static struct attribute *max8997_attrs[] = {
 	&dev_attr_mode.attr,
 	NULL
 };
 ATTRIBUTE_GROUPS(max8997);

 static int max8997_led_probe(struct platform_device *pdev)
 {
 	struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 	struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
 	struct max8997_led *led;
 	char name[20];
 	int ret = 0;

 	if (pdata == NULL) {
 		dev_err(&pdev->dev, "no platform data\n");
 		return -ENODEV;
 	}

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

 	led->id = pdev->id;
 	snprintf(name, sizeof(name), "max8997-led%d", pdev->id);

 	led->cdev.name = name;
 	led->cdev.brightness_set = max8997_led_brightness_set;
 	led->cdev.flags |= LED_CORE_SUSPENDRESUME;
 	led->cdev.brightness = 0;
 	led->cdev.groups = max8997_groups;
 	led->iodev = iodev;

 	/* initialize mode and brightness according to platform_data */
 	if (pdata->led_pdata) {
 		u8 mode = 0, brightness = 0;

 		mode = pdata->led_pdata->mode[led->id];
 		brightness = pdata->led_pdata->brightness[led->id];

 		max8997_led_set_mode(led, pdata->led_pdata->mode[led->id]);

 		if (brightness > led->cdev.max_brightness)
 			brightness = led->cdev.max_brightness;
 		max8997_led_set_current(led, brightness);
 		led->cdev.brightness = brightness;
 	} else {
 		max8997_led_set_mode(led, MAX8997_NONE);
 		max8997_led_set_current(led, 0);
 	}

 	mutex_init(&led->mutex);

 	ret = devm_led_classdev_register(&pdev->dev, &led->cdev);
 	if (ret < 0)
 		return ret;

 	return 0;
 }

 static struct platform_driver max8997_led_driver = {
 	.driver = {
 		.name  = "max8997-led",
 	},
 	.probe  = max8997_led_probe,
 };

 module_platform_driver(max8997_led_driver);

 MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
 MODULE_DESCRIPTION("MAX8997 LED driver");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:max8997-led");
	/*
	* leds-max8997.c - LED class driver for MAX8997 LEDs.
	*
	* Copyright (C) 2011 Samsung Electronics
	* Donggeun Kim <dg77.kim@samsung.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*
	*/

	#include <linux/module.h>
	#include <linux/err.h>
	#include <linux/slab.h>
	#include <linux/leds.h>
	#include <linux/mfd/max8997.h>
	#include <linux/mfd/max8997-private.h>
	#include <linux/platform_device.h>

	#define MAX8997_LED_FLASH_SHIFT 3
	#define MAX8997_LED_FLASH_CUR_MASK 0xf8
	#define MAX8997_LED_MOVIE_SHIFT 4
	#define MAX8997_LED_MOVIE_CUR_MASK 0xf0

	#define MAX8997_LED_FLASH_MAX_BRIGHTNESS 0x1f
	#define MAX8997_LED_MOVIE_MAX_BRIGHTNESS 0xf
	#define MAX8997_LED_NONE_MAX_BRIGHTNESS 0

	#define MAX8997_LED0_FLASH_MASK 0x1
	#define MAX8997_LED0_FLASH_PIN_MASK 0x5
	#define MAX8997_LED0_MOVIE_MASK 0x8
	#define MAX8997_LED0_MOVIE_PIN_MASK 0x28

	#define MAX8997_LED1_FLASH_MASK 0x2
	#define MAX8997_LED1_FLASH_PIN_MASK 0x6
	#define MAX8997_LED1_MOVIE_MASK 0x10
	#define MAX8997_LED1_MOVIE_PIN_MASK 0x30

	#define MAX8997_LED_BOOST_ENABLE_MASK (1 << 6)

	struct max8997_led {
	struct max8997_dev *iodev;
	struct led_classdev cdev;
	bool enabled;
	int id;
	enum max8997_led_mode led_mode;
	struct mutex mutex;
	};

	static void max8997_led_set_mode(struct max8997_led *led,
	enum max8997_led_mode mode)
	{
	int ret;
	struct i2c_client *client = led->iodev->i2c;
	u8 mask = 0, val;

	switch (mode) {
	case MAX8997_FLASH_MODE:
	mask = MAX8997_LED1_FLASH_MASK \| MAX8997_LED0_FLASH_MASK;
	val = led->id ?
	MAX8997_LED1_FLASH_MASK : MAX8997_LED0_FLASH_MASK;
	led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS;
	break;
	case MAX8997_MOVIE_MODE:
	mask = MAX8997_LED1_MOVIE_MASK \| MAX8997_LED0_MOVIE_MASK;
	val = led->id ?
	MAX8997_LED1_MOVIE_MASK : MAX8997_LED0_MOVIE_MASK;
	led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS;
	break;
	case MAX8997_FLASH_PIN_CONTROL_MODE:
	mask = MAX8997_LED1_FLASH_PIN_MASK \|
	MAX8997_LED0_FLASH_PIN_MASK;
	val = led->id ?
	MAX8997_LED1_FLASH_PIN_MASK : MAX8997_LED0_FLASH_PIN_MASK;
	led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS;
	break;
	case MAX8997_MOVIE_PIN_CONTROL_MODE:
	mask = MAX8997_LED1_MOVIE_PIN_MASK \|
	MAX8997_LED0_MOVIE_PIN_MASK;
	val = led->id ?
	MAX8997_LED1_MOVIE_PIN_MASK : MAX8997_LED0_MOVIE_PIN_MASK;
	led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS;
	break;
	default:
	led->cdev.max_brightness = MAX8997_LED_NONE_MAX_BRIGHTNESS;
	break;
	}

	if (mask) {
	ret = max8997_update_reg(client, MAX8997_REG_LEN_CNTL, val,
	mask);
	if (ret)
	dev_err(led->iodev->dev,
	"failed to update register(%d)\n", ret);
	}

	led->led_mode = mode;
	}

	static void max8997_led_enable(struct max8997_led *led, bool enable)
	{
	int ret;
	struct i2c_client *client = led->iodev->i2c;
	u8 val = 0, mask = MAX8997_LED_BOOST_ENABLE_MASK;

	if (led->enabled == enable)
	return;

	val = enable ? MAX8997_LED_BOOST_ENABLE_MASK : 0;

	ret = max8997_update_reg(client, MAX8997_REG_BOOST_CNTL, val, mask);
	if (ret)
	dev_err(led->iodev->dev,
	"failed to update register(%d)\n", ret);

	led->enabled = enable;
	}

	static void max8997_led_set_current(struct max8997_led *led,
	enum led_brightness value)
	{
	int ret;
	struct i2c_client *client = led->iodev->i2c;
	u8 val = 0, mask = 0, reg = 0;

	switch (led->led_mode) {
	case MAX8997_FLASH_MODE:
	case MAX8997_FLASH_PIN_CONTROL_MODE:
	val = value << MAX8997_LED_FLASH_SHIFT;
	mask = MAX8997_LED_FLASH_CUR_MASK;
	reg = led->id ? MAX8997_REG_FLASH2_CUR : MAX8997_REG_FLASH1_CUR;
	break;
	case MAX8997_MOVIE_MODE:
	case MAX8997_MOVIE_PIN_CONTROL_MODE:
	val = value << MAX8997_LED_MOVIE_SHIFT;
	mask = MAX8997_LED_MOVIE_CUR_MASK;
	reg = MAX8997_REG_MOVIE_CUR;
	break;
	default:
	break;
	}

	if (mask) {
	ret = max8997_update_reg(client, reg, val, mask);
	if (ret)
	dev_err(led->iodev->dev,
	"failed to update register(%d)\n", ret);
	}
	}

	static void max8997_led_brightness_set(struct led_classdev *led_cdev,
	enum led_brightness value)
	{
	struct max8997_led *led =
	container_of(led_cdev, struct max8997_led, cdev);

	if (value) {
	max8997_led_set_current(led, value);
	max8997_led_enable(led, true);
	} else {
	max8997_led_set_current(led, value);
	max8997_led_enable(led, false);
	}
	}

	static ssize_t max8997_led_show_mode(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct max8997_led *led =
	container_of(led_cdev, struct max8997_led, cdev);
	ssize_t ret = 0;

	mutex_lock(&led->mutex);

	switch (led->led_mode) {
	case MAX8997_FLASH_MODE:
	ret += sprintf(buf, "FLASH\n");
	break;
	case MAX8997_MOVIE_MODE:
	ret += sprintf(buf, "MOVIE\n");
	break;
	case MAX8997_FLASH_PIN_CONTROL_MODE:
	ret += sprintf(buf, "FLASH_PIN_CONTROL\n");
	break;
	case MAX8997_MOVIE_PIN_CONTROL_MODE:
	ret += sprintf(buf, "MOVIE_PIN_CONTROL\n");
	break;
	default:
	ret += sprintf(buf, "NONE\n");
	break;
	}

	mutex_unlock(&led->mutex);

	return ret;
	}

	static ssize_t max8997_led_store_mode(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t size)
	{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct max8997_led *led =
	container_of(led_cdev, struct max8997_led, cdev);
	enum max8997_led_mode mode;

	mutex_lock(&led->mutex);

	if (!strncmp(buf, "FLASH_PIN_CONTROL", 17))
	mode = MAX8997_FLASH_PIN_CONTROL_MODE;
	else if (!strncmp(buf, "MOVIE_PIN_CONTROL", 17))
	mode = MAX8997_MOVIE_PIN_CONTROL_MODE;
	else if (!strncmp(buf, "FLASH", 5))
	mode = MAX8997_FLASH_MODE;
	else if (!strncmp(buf, "MOVIE", 5))
	mode = MAX8997_MOVIE_MODE;
	else
	mode = MAX8997_NONE;

	max8997_led_set_mode(led, mode);

	mutex_unlock(&led->mutex);

	return size;
	}

	static DEVICE_ATTR(mode, 0644, max8997_led_show_mode, max8997_led_store_mode);

	static struct attribute *max8997_attrs[] = {
	&dev_attr_mode.attr,
	NULL
	};
	ATTRIBUTE_GROUPS(max8997);

	static int max8997_led_probe(struct platform_device *pdev)
	{
	struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
	struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
	struct max8997_led *led;
	char name[20];
	int ret = 0;

	if (pdata == NULL) {
	dev_err(&pdev->dev, "no platform data\n");
	return -ENODEV;
	}

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

	led->id = pdev->id;
	snprintf(name, sizeof(name), "max8997-led%d", pdev->id);

	led->cdev.name = name;
	led->cdev.brightness_set = max8997_led_brightness_set;
	led->cdev.flags \|= LED_CORE_SUSPENDRESUME;
	led->cdev.brightness = 0;
	led->cdev.groups = max8997_groups;
	led->iodev = iodev;

	/* initialize mode and brightness according to platform_data */
	if (pdata->led_pdata) {
	u8 mode = 0, brightness = 0;

	mode = pdata->led_pdata->mode[led->id];
	brightness = pdata->led_pdata->brightness[led->id];

	max8997_led_set_mode(led, pdata->led_pdata->mode[led->id]);

	if (brightness > led->cdev.max_brightness)
	brightness = led->cdev.max_brightness;
	max8997_led_set_current(led, brightness);
	led->cdev.brightness = brightness;
	} else {
	max8997_led_set_mode(led, MAX8997_NONE);
	max8997_led_set_current(led, 0);
	}

	mutex_init(&led->mutex);

	ret = devm_led_classdev_register(&pdev->dev, &led->cdev);
	if (ret < 0)
	return ret;

	return 0;
	}

	static struct platform_driver max8997_led_driver = {
	.driver = {
	.name = "max8997-led",
	},
	.probe = max8997_led_probe,
	};

	module_platform_driver(max8997_led_driver);

	MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
	MODULE_DESCRIPTION("MAX8997 LED driver");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:max8997-led");