drivers/leds/leds-88pm860x.c - kernel/skids - Git at Google

 /*
  * LED driver for Marvell 88PM860x
  *
  * Copyright (C) 2009 Marvell International Ltd.
  *	Haojian Zhuang <haojian.zhuang@marvell.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/kernel.h>
 #include <linux/init.h>
 #include <linux/platform_device.h>
 #include <linux/i2c.h>
 #include <linux/leds.h>
 #include <linux/slab.h>
 #include <linux/workqueue.h>
 #include <linux/mfd/88pm860x.h>

 #define LED_PWM_SHIFT		(3)
 #define LED_PWM_MASK		(0x1F)
 #define LED_CURRENT_MASK	(0x07 << 5)

 #define LED_BLINK_ON_MASK	(0x07)
 #define LED_BLINK_PERIOD_MASK	(0x0F << 3)
 #define LED_BLINK_MASK		(0x7F)

 #define LED_BLINK_ON(x)		((x & 0x7) * 66 + 66)
 #define LED_BLINK_PERIOD(x)	((x & 0xF) * 530 + 930)
 #define LED_BLINK_ON_MIN	LED_BLINK_ON(0)
 #define LED_BLINK_ON_MAX	LED_BLINK_ON(0x7)
 #define LED_BLINK_PERIOD_MIN	LED_BLINK_PERIOD(0)
 #define LED_BLINK_PERIOD_MAX	LED_BLINK_PERIOD(0xE)
 #define LED_TO_ON(x)		((x - 66) / 66)
 #define LED_TO_PERIOD(x)	((x - 930) / 530)

 #define LED1_BLINK_EN		(1 << 1)
 #define LED2_BLINK_EN		(1 << 2)

 enum {
 	SET_BRIGHTNESS,
 	SET_BLINK,
 };

 struct pm860x_led {
 	struct led_classdev cdev;
 	struct i2c_client *i2c;
 	struct work_struct work;
 	struct pm860x_chip *chip;
 	struct mutex lock;
 	char name[MFD_NAME_SIZE];

 	int port;
 	int iset;
 	int command;
 	int offset;
 	unsigned char brightness;
 	unsigned char current_brightness;

 	int blink_data;
 	int blink_time;
 	int blink_on;
 	int blink_off;
 };

 /* return offset of color register */
 static inline int __led_off(int port)
 {
 	int ret = -EINVAL;

 	switch (port) {
 	case PM8606_LED1_RED:
 	case PM8606_LED1_GREEN:
 	case PM8606_LED1_BLUE:
 		ret = port - PM8606_LED1_RED + PM8606_RGB1B;
 		break;
 	case PM8606_LED2_RED:
 	case PM8606_LED2_GREEN:
 	case PM8606_LED2_BLUE:
 		ret = port - PM8606_LED2_RED + PM8606_RGB2B;
 		break;
 	}
 	return ret;
 }

 /* return offset of blink register */
 static inline int __blink_off(int port)
 {
 	int ret = -EINVAL;

 	switch (port) {
 	case PM8606_LED1_RED:
 	case PM8606_LED1_GREEN:
 	case PM8606_LED1_BLUE:
 		ret = PM8606_RGB1A;
 	case PM8606_LED2_RED:
 	case PM8606_LED2_GREEN:
 	case PM8606_LED2_BLUE:
 		ret = PM8606_RGB2A;
 	}
 	return ret;
 }

 static inline int __blink_ctl_mask(int port)
 {
 	int ret = -EINVAL;

 	switch (port) {
 	case PM8606_LED1_RED:
 	case PM8606_LED1_GREEN:
 	case PM8606_LED1_BLUE:
 		ret = LED1_BLINK_EN;
 		break;
 	case PM8606_LED2_RED:
 	case PM8606_LED2_GREEN:
 	case PM8606_LED2_BLUE:
 		ret = LED2_BLINK_EN;
 		break;
 	}
 	return ret;
 }

 static int __led_set(struct pm860x_led *led, int command)
 {
 	struct pm860x_chip *chip = led->chip;
 	int mask, ret;

 	mutex_lock(&led->lock);
 	switch (command) {
 	case SET_BRIGHTNESS:
 		if ((led->current_brightness == 0) && led->brightness) {
 			if (led->iset) {
 				ret = pm860x_set_bits(led->i2c, led->offset,
 						LED_CURRENT_MASK, led->iset);
 				if (ret < 0)
 					goto out;
 			}
 		} else if (led->brightness == 0) {
 			ret = pm860x_set_bits(led->i2c, led->offset,
 						LED_CURRENT_MASK, 0);
 			if (ret < 0)
 				goto out;
 		}
 		ret = pm860x_set_bits(led->i2c, led->offset, LED_PWM_MASK,
 					led->brightness);
 		if (ret < 0)
 			goto out;
 		led->current_brightness = led->brightness;
 		dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
 			led->offset, led->brightness);
 		break;
 	case SET_BLINK:
 		ret = pm860x_set_bits(led->i2c, led->offset,
 				LED_BLINK_MASK, led->blink_data);
 		if (ret < 0)
 			goto out;

 		mask = __blink_ctl_mask(led->port);
 		ret = pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, mask);
 		if (ret < 0)
 			goto out;
 		dev_dbg(chip->dev, "LED blink delay on:%dms, delay off:%dms\n",
 			led->blink_on, led->blink_off);
 		break;
 	}
 out:
 	mutex_unlock(&led->lock);
 	return 0;
 }

 static void pm860x_led_work(struct work_struct *work)
 {
 	struct pm860x_led *led;

 	led = container_of(work, struct pm860x_led, work);
 	__led_set(led, led->command);
 }

 static void pm860x_led_set(struct led_classdev *cdev,
 			   enum led_brightness value)
 {
 	struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);

 	data->offset = __led_off(data->port);
 	data->brightness = value >> 3;
 	data->command = SET_BRIGHTNESS;
 	schedule_work(&data->work);
 }

 static int pm860x_led_blink(struct led_classdev *cdev,
 			    unsigned long *delay_on,
 			    unsigned long *delay_off)
 {
 	struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);
 	int period, on;

 	on = *delay_on;
 	if ((on < LED_BLINK_ON_MIN) || (on > LED_BLINK_ON_MAX))
 		return -EINVAL;

 	on = LED_TO_ON(on);
 	on = LED_BLINK_ON(on);

 	period = on + *delay_off;
 	if ((period < LED_BLINK_PERIOD_MIN) || (period > LED_BLINK_PERIOD_MAX))
 		return -EINVAL;
 	period = LED_TO_PERIOD(period);
 	period = LED_BLINK_PERIOD(period);

 	data->offset = __blink_off(data->port);
 	data->blink_on = on;
 	data->blink_off = period - data->blink_on;
 	data->blink_data = (period << 3) | data->blink_on;
 	data->command = SET_BLINK;
 	schedule_work(&data->work);

 	return 0;
 }

 static int __check_device(struct pm860x_led_pdata *pdata, char *name)
 {
 	struct pm860x_led_pdata *p = pdata;
 	int ret = -EINVAL;

 	while (p && p->id) {
 		if ((p->id != PM8606_ID_LED) || (p->flags < 0))
 			break;

 		if (!strncmp(name, pm860x_led_name[p->flags],
 			MFD_NAME_SIZE)) {
 			ret = (int)p->flags;
 			break;
 		}
 		p++;
 	}
 	return ret;
 }

 static int pm860x_led_probe(struct platform_device *pdev)
 {
 	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
 	struct pm860x_platform_data *pm860x_pdata;
 	struct pm860x_led_pdata *pdata;
 	struct pm860x_led *data;
 	struct resource *res;
 	int ret;

 	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 	if (res == NULL) {
 		dev_err(&pdev->dev, "No I/O resource!\n");
 		return -EINVAL;
 	}

 	if (pdev->dev.parent->platform_data) {
 		pm860x_pdata = pdev->dev.parent->platform_data;
 		pdata = pm860x_pdata->led;
 	} else {
 		dev_err(&pdev->dev, "missing platform data\n");
 		return -EINVAL;
 	}

 	data = kzalloc(sizeof(struct pm860x_led), GFP_KERNEL);
 	if (data == NULL)
 		return -ENOMEM;
 	strncpy(data->name, res->name, MFD_NAME_SIZE);
 	dev_set_drvdata(&pdev->dev, data);
 	data->chip = chip;
 	data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
 	data->iset = pdata->iset;
 	data->port = __check_device(pdata, data->name);
 	if (data->port < 0) {
 		dev_err(&pdev->dev, "check device failed\n");
 		kfree(data);
 		return -EINVAL;
 	}

 	data->current_brightness = 0;
 	data->cdev.name = data->name;
 	data->cdev.brightness_set = pm860x_led_set;
 	data->cdev.blink_set = pm860x_led_blink;
 	mutex_init(&data->lock);
 	INIT_WORK(&data->work, pm860x_led_work);

 	ret = led_classdev_register(chip->dev, &data->cdev);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
 		goto out;
 	}
 	return 0;
 out:
 	kfree(data);
 	return ret;
 }

 static int pm860x_led_remove(struct platform_device *pdev)
 {
 	struct pm860x_led *data = platform_get_drvdata(pdev);

 	led_classdev_unregister(&data->cdev);
 	kfree(data);

 	return 0;
 }

 static struct platform_driver pm860x_led_driver = {
 	.driver	= {
 		.name	= "88pm860x-led",
 		.owner	= THIS_MODULE,
 	},
 	.probe	= pm860x_led_probe,
 	.remove	= pm860x_led_remove,
 };

 static int __devinit pm860x_led_init(void)
 {
 	return platform_driver_register(&pm860x_led_driver);
 }
 module_init(pm860x_led_init);

 static void __devexit pm860x_led_exit(void)
 {
 	platform_driver_unregister(&pm860x_led_driver);
 }
 module_exit(pm860x_led_exit);

 MODULE_DESCRIPTION("LED driver for Marvell PM860x");
 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:88pm860x-led");
	/*
	* LED driver for Marvell 88PM860x
	*
	* Copyright (C) 2009 Marvell International Ltd.
	* Haojian Zhuang <haojian.zhuang@marvell.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/kernel.h>
	#include <linux/init.h>
	#include <linux/platform_device.h>
	#include <linux/i2c.h>
	#include <linux/leds.h>
	#include <linux/slab.h>
	#include <linux/workqueue.h>
	#include <linux/mfd/88pm860x.h>

	#define LED_PWM_SHIFT (3)
	#define LED_PWM_MASK (0x1F)
	#define LED_CURRENT_MASK (0x07 << 5)

	#define LED_BLINK_ON_MASK (0x07)
	#define LED_BLINK_PERIOD_MASK (0x0F << 3)
	#define LED_BLINK_MASK (0x7F)

	#define LED_BLINK_ON(x) ((x & 0x7) * 66 + 66)
	#define LED_BLINK_PERIOD(x) ((x & 0xF) * 530 + 930)
	#define LED_BLINK_ON_MIN LED_BLINK_ON(0)
	#define LED_BLINK_ON_MAX LED_BLINK_ON(0x7)
	#define LED_BLINK_PERIOD_MIN LED_BLINK_PERIOD(0)
	#define LED_BLINK_PERIOD_MAX LED_BLINK_PERIOD(0xE)
	#define LED_TO_ON(x) ((x - 66) / 66)
	#define LED_TO_PERIOD(x) ((x - 930) / 530)

	#define LED1_BLINK_EN (1 << 1)
	#define LED2_BLINK_EN (1 << 2)

	enum {
	SET_BRIGHTNESS,
	SET_BLINK,
	};

	struct pm860x_led {
	struct led_classdev cdev;
	struct i2c_client *i2c;
	struct work_struct work;
	struct pm860x_chip *chip;
	struct mutex lock;
	char name[MFD_NAME_SIZE];

	int port;
	int iset;
	int command;
	int offset;
	unsigned char brightness;
	unsigned char current_brightness;

	int blink_data;
	int blink_time;
	int blink_on;
	int blink_off;
	};

	/* return offset of color register */
	static inline int __led_off(int port)
	{
	int ret = -EINVAL;

	switch (port) {
	case PM8606_LED1_RED:
	case PM8606_LED1_GREEN:
	case PM8606_LED1_BLUE:
	ret = port - PM8606_LED1_RED + PM8606_RGB1B;
	break;
	case PM8606_LED2_RED:
	case PM8606_LED2_GREEN:
	case PM8606_LED2_BLUE:
	ret = port - PM8606_LED2_RED + PM8606_RGB2B;
	break;
	}
	return ret;
	}

	/* return offset of blink register */
	static inline int __blink_off(int port)
	{
	int ret = -EINVAL;

	switch (port) {
	case PM8606_LED1_RED:
	case PM8606_LED1_GREEN:
	case PM8606_LED1_BLUE:
	ret = PM8606_RGB1A;
	case PM8606_LED2_RED:
	case PM8606_LED2_GREEN:
	case PM8606_LED2_BLUE:
	ret = PM8606_RGB2A;
	}
	return ret;
	}

	static inline int __blink_ctl_mask(int port)
	{
	int ret = -EINVAL;

	switch (port) {
	case PM8606_LED1_RED:
	case PM8606_LED1_GREEN:
	case PM8606_LED1_BLUE:
	ret = LED1_BLINK_EN;
	break;
	case PM8606_LED2_RED:
	case PM8606_LED2_GREEN:
	case PM8606_LED2_BLUE:
	ret = LED2_BLINK_EN;
	break;
	}
	return ret;
	}

	static int __led_set(struct pm860x_led *led, int command)
	{
	struct pm860x_chip *chip = led->chip;
	int mask, ret;

	mutex_lock(&led->lock);
	switch (command) {
	case SET_BRIGHTNESS:
	if ((led->current_brightness == 0) && led->brightness) {
	if (led->iset) {
	ret = pm860x_set_bits(led->i2c, led->offset,
	LED_CURRENT_MASK, led->iset);
	if (ret < 0)
	goto out;
	}
	} else if (led->brightness == 0) {
	ret = pm860x_set_bits(led->i2c, led->offset,
	LED_CURRENT_MASK, 0);
	if (ret < 0)
	goto out;
	}
	ret = pm860x_set_bits(led->i2c, led->offset, LED_PWM_MASK,
	led->brightness);
	if (ret < 0)
	goto out;
	led->current_brightness = led->brightness;
	dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
	led->offset, led->brightness);
	break;
	case SET_BLINK:
	ret = pm860x_set_bits(led->i2c, led->offset,
	LED_BLINK_MASK, led->blink_data);
	if (ret < 0)
	goto out;

	mask = __blink_ctl_mask(led->port);
	ret = pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, mask);
	if (ret < 0)
	goto out;
	dev_dbg(chip->dev, "LED blink delay on:%dms, delay off:%dms\n",
	led->blink_on, led->blink_off);
	break;
	}
	out:
	mutex_unlock(&led->lock);
	return 0;
	}

	static void pm860x_led_work(struct work_struct *work)
	{
	struct pm860x_led *led;

	led = container_of(work, struct pm860x_led, work);
	__led_set(led, led->command);
	}

	static void pm860x_led_set(struct led_classdev *cdev,
	enum led_brightness value)
	{
	struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);

	data->offset = __led_off(data->port);
	data->brightness = value >> 3;
	data->command = SET_BRIGHTNESS;
	schedule_work(&data->work);
	}

	static int pm860x_led_blink(struct led_classdev *cdev,
	unsigned long *delay_on,
	unsigned long *delay_off)
	{
	struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);
	int period, on;

	on = *delay_on;
	if ((on < LED_BLINK_ON_MIN) \|\| (on > LED_BLINK_ON_MAX))
	return -EINVAL;

	on = LED_TO_ON(on);
	on = LED_BLINK_ON(on);

	period = on + *delay_off;
	if ((period < LED_BLINK_PERIOD_MIN) \|\| (period > LED_BLINK_PERIOD_MAX))
	return -EINVAL;
	period = LED_TO_PERIOD(period);
	period = LED_BLINK_PERIOD(period);

	data->offset = __blink_off(data->port);
	data->blink_on = on;
	data->blink_off = period - data->blink_on;
	data->blink_data = (period << 3) \| data->blink_on;
	data->command = SET_BLINK;
	schedule_work(&data->work);

	return 0;
	}

	static int __check_device(struct pm860x_led_pdata pdata, char name)
	{
	struct pm860x_led_pdata *p = pdata;
	int ret = -EINVAL;

	while (p && p->id) {
	if ((p->id != PM8606_ID_LED) \|\| (p->flags < 0))
	break;

	if (!strncmp(name, pm860x_led_name[p->flags],
	MFD_NAME_SIZE)) {
	ret = (int)p->flags;
	break;
	}
	p++;
	}
	return ret;
	}

	static int pm860x_led_probe(struct platform_device *pdev)
	{
	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
	struct pm860x_platform_data *pm860x_pdata;
	struct pm860x_led_pdata *pdata;
	struct pm860x_led *data;
	struct resource *res;
	int ret;

	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	if (res == NULL) {
	dev_err(&pdev->dev, "No I/O resource!\n");
	return -EINVAL;
	}

	if (pdev->dev.parent->platform_data) {
	pm860x_pdata = pdev->dev.parent->platform_data;
	pdata = pm860x_pdata->led;
	} else {
	dev_err(&pdev->dev, "missing platform data\n");
	return -EINVAL;
	}

	data = kzalloc(sizeof(struct pm860x_led), GFP_KERNEL);
	if (data == NULL)
	return -ENOMEM;
	strncpy(data->name, res->name, MFD_NAME_SIZE);
	dev_set_drvdata(&pdev->dev, data);
	data->chip = chip;
	data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
	data->iset = pdata->iset;
	data->port = __check_device(pdata, data->name);
	if (data->port < 0) {
	dev_err(&pdev->dev, "check device failed\n");
	kfree(data);
	return -EINVAL;
	}

	data->current_brightness = 0;
	data->cdev.name = data->name;
	data->cdev.brightness_set = pm860x_led_set;
	data->cdev.blink_set = pm860x_led_blink;
	mutex_init(&data->lock);
	INIT_WORK(&data->work, pm860x_led_work);

	ret = led_classdev_register(chip->dev, &data->cdev);
	if (ret < 0) {
	dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
	goto out;
	}
	return 0;
	out:
	kfree(data);
	return ret;
	}

	static int pm860x_led_remove(struct platform_device *pdev)
	{
	struct pm860x_led *data = platform_get_drvdata(pdev);

	led_classdev_unregister(&data->cdev);
	kfree(data);

	return 0;
	}

	static struct platform_driver pm860x_led_driver = {
	.driver = {
	.name = "88pm860x-led",
	.owner = THIS_MODULE,
	},
	.probe = pm860x_led_probe,
	.remove = pm860x_led_remove,
	};

	static int __devinit pm860x_led_init(void)
	{
	return platform_driver_register(&pm860x_led_driver);
	}
	module_init(pm860x_led_init);

	static void __devexit pm860x_led_exit(void)
	{
	platform_driver_unregister(&pm860x_led_driver);
	}
	module_exit(pm860x_led_exit);

	MODULE_DESCRIPTION("LED driver for Marvell PM860x");
	MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:88pm860x-led");