drivers/leds/leds-wm831x-status.c - kernel/msm-4.9 - Gitiles

 /*
  * LED driver for WM831x status LEDs
  *
  * Copyright(C) 2009 Wolfson Microelectronics PLC.
  *
  * 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/platform_device.h>
 #include <linux/slab.h>
 #include <linux/leds.h>
 #include <linux/err.h>
 #include <linux/mfd/wm831x/core.h>
 #include <linux/mfd/wm831x/pdata.h>
 #include <linux/mfd/wm831x/status.h>
 #include <linux/module.h>


 struct wm831x_status {
 	struct led_classdev cdev;
 	struct wm831x *wm831x;
 	struct work_struct work;
 	struct mutex mutex;

 	spinlock_t value_lock;
 	int reg;     /* Control register */
 	int reg_val; /* Control register value */

 	int blink;
 	int blink_time;
 	int blink_cyc;
 	int src;
 	enum led_brightness brightness;
 };

 #define to_wm831x_status(led_cdev) \
 	container_of(led_cdev, struct wm831x_status, cdev)

 static void wm831x_status_work(struct work_struct *work)
 {
 	struct wm831x_status *led = container_of(work, struct wm831x_status,
 						 work);
 	unsigned long flags;

 	mutex_lock(&led->mutex);

 	led->reg_val &= ~(WM831X_LED_SRC_MASK | WM831X_LED_MODE_MASK |
 			  WM831X_LED_DUTY_CYC_MASK | WM831X_LED_DUR_MASK);

 	spin_lock_irqsave(&led->value_lock, flags);

 	led->reg_val |= led->src << WM831X_LED_SRC_SHIFT;
 	if (led->blink) {
 		led->reg_val |= 2 << WM831X_LED_MODE_SHIFT;
 		led->reg_val |= led->blink_time << WM831X_LED_DUR_SHIFT;
 		led->reg_val |= led->blink_cyc;
 	} else {
 		if (led->brightness != LED_OFF)
 			led->reg_val |= 1 << WM831X_LED_MODE_SHIFT;
 	}

 	spin_unlock_irqrestore(&led->value_lock, flags);

 	wm831x_reg_write(led->wm831x, led->reg, led->reg_val);

 	mutex_unlock(&led->mutex);
 }

 static void wm831x_status_set(struct led_classdev *led_cdev,
 			   enum led_brightness value)
 {
 	struct wm831x_status *led = to_wm831x_status(led_cdev);
 	unsigned long flags;

 	spin_lock_irqsave(&led->value_lock, flags);
 	led->brightness = value;
 	if (value == LED_OFF)
 		led->blink = 0;
 	schedule_work(&led->work);
 	spin_unlock_irqrestore(&led->value_lock, flags);
 }

 static int wm831x_status_blink_set(struct led_classdev *led_cdev,
 				   unsigned long *delay_on,
 				   unsigned long *delay_off)
 {
 	struct wm831x_status *led = to_wm831x_status(led_cdev);
 	unsigned long flags;
 	int ret = 0;

 	/* Pick some defaults if we've not been given times */
 	if (*delay_on == 0 && *delay_off == 0) {
 		*delay_on = 250;
 		*delay_off = 250;
 	}

 	spin_lock_irqsave(&led->value_lock, flags);

 	/* We only have a limited selection of settings, see if we can
 	 * support the configuration we're being given */
 	switch (*delay_on) {
 	case 1000:
 		led->blink_time = 0;
 		break;
 	case 250:
 		led->blink_time = 1;
 		break;
 	case 125:
 		led->blink_time = 2;
 		break;
 	case 62:
 	case 63:
 		/* Actually 62.5ms */
 		led->blink_time = 3;
 		break;
 	default:
 		ret = -EINVAL;
 		break;
 	}

 	if (ret == 0) {
 		switch (*delay_off / *delay_on) {
 		case 1:
 			led->blink_cyc = 0;
 			break;
 		case 3:
 			led->blink_cyc = 1;
 			break;
 		case 4:
 			led->blink_cyc = 2;
 			break;
 		case 8:
 			led->blink_cyc = 3;
 			break;
 		default:
 			ret = -EINVAL;
 			break;
 		}
 	}

 	if (ret == 0)
 		led->blink = 1;
 	else
 		led->blink = 0;

 	/* Always update; if we fail turn off blinking since we expect
 	 * a software fallback. */
 	schedule_work(&led->work);

 	spin_unlock_irqrestore(&led->value_lock, flags);

 	return ret;
 }

 static const char * const led_src_texts[] = {
 	"otp",
 	"power",
 	"charger",
 	"soft",
 };

 static ssize_t wm831x_status_src_show(struct device *dev,
 				      struct device_attribute *attr, char *buf)
 {
 	struct led_classdev *led_cdev = dev_get_drvdata(dev);
 	struct wm831x_status *led = to_wm831x_status(led_cdev);
 	int i;
 	ssize_t ret = 0;

 	mutex_lock(&led->mutex);

 	for (i = 0; i < ARRAY_SIZE(led_src_texts); i++)
 		if (i == led->src)
 			ret += sprintf(&buf[ret], "[%s] ", led_src_texts[i]);
 		else
 			ret += sprintf(&buf[ret], "%s ", led_src_texts[i]);

 	mutex_unlock(&led->mutex);

 	ret += sprintf(&buf[ret], "\n");

 	return ret;
 }

 static ssize_t wm831x_status_src_store(struct device *dev,
 				       struct device_attribute *attr,
 				       const char *buf, size_t size)
 {
 	struct led_classdev *led_cdev = dev_get_drvdata(dev);
 	struct wm831x_status *led = to_wm831x_status(led_cdev);
 	char name[20];
 	int i;
 	size_t len;

 	name[sizeof(name) - 1] = '\0';
 	strncpy(name, buf, sizeof(name) - 1);
 	len = strlen(name);

 	if (len && name[len - 1] == '\n')
 		name[len - 1] = '\0';

 	for (i = 0; i < ARRAY_SIZE(led_src_texts); i++) {
 		if (!strcmp(name, led_src_texts[i])) {
 			mutex_lock(&led->mutex);

 			led->src = i;
 			schedule_work(&led->work);

 			mutex_unlock(&led->mutex);
 		}
 	}

 	return size;
 }

 static DEVICE_ATTR(src, 0644, wm831x_status_src_show, wm831x_status_src_store);

 static struct attribute *wm831x_status_attrs[] = {
 	&dev_attr_src.attr,
 	NULL
 };
 ATTRIBUTE_GROUPS(wm831x_status);

 static int wm831x_status_probe(struct platform_device *pdev)
 {
 	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 	struct wm831x_pdata *chip_pdata;
 	struct wm831x_status_pdata pdata;
 	struct wm831x_status *drvdata;
 	struct resource *res;
 	int id = pdev->id % ARRAY_SIZE(chip_pdata->status);
 	int ret;

 	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 	if (res == NULL) {
 		dev_err(&pdev->dev, "No register resource\n");
 		return -EINVAL;
 	}

 	drvdata = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_status),
 			       GFP_KERNEL);
 	if (!drvdata)
 		return -ENOMEM;
 	platform_set_drvdata(pdev, drvdata);

 	drvdata->wm831x = wm831x;
 	drvdata->reg = res->start;

 	if (dev_get_platdata(wm831x->dev))
 		chip_pdata = dev_get_platdata(wm831x->dev);
 	else
 		chip_pdata = NULL;

 	memset(&pdata, 0, sizeof(pdata));
 	if (chip_pdata && chip_pdata->status[id])
 		memcpy(&pdata, chip_pdata->status[id], sizeof(pdata));
 	else
 		pdata.name = dev_name(&pdev->dev);

 	mutex_init(&drvdata->mutex);
 	INIT_WORK(&drvdata->work, wm831x_status_work);
 	spin_lock_init(&drvdata->value_lock);

 	/* We cache the configuration register and read startup values
 	 * from it. */
 	drvdata->reg_val = wm831x_reg_read(wm831x, drvdata->reg);

 	if (drvdata->reg_val & WM831X_LED_MODE_MASK)
 		drvdata->brightness = LED_FULL;
 	else
 		drvdata->brightness = LED_OFF;

 	/* Set a default source if configured, otherwise leave the
 	 * current hardware setting.
 	 */
 	if (pdata.default_src == WM831X_STATUS_PRESERVE) {
 		drvdata->src = drvdata->reg_val;
 		drvdata->src &= WM831X_LED_SRC_MASK;
 		drvdata->src >>= WM831X_LED_SRC_SHIFT;
 	} else {
 		drvdata->src = pdata.default_src - 1;
 	}

 	drvdata->cdev.name = pdata.name;
 	drvdata->cdev.default_trigger = pdata.default_trigger;
 	drvdata->cdev.brightness_set = wm831x_status_set;
 	drvdata->cdev.blink_set = wm831x_status_blink_set;
 	drvdata->cdev.groups = wm831x_status_groups;

 	ret = led_classdev_register(wm831x->dev, &drvdata->cdev);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
 		return ret;
 	}

 	return 0;
 }

 static int wm831x_status_remove(struct platform_device *pdev)
 {
 	struct wm831x_status *drvdata = platform_get_drvdata(pdev);

 	led_classdev_unregister(&drvdata->cdev);

 	return 0;
 }

 static struct platform_driver wm831x_status_driver = {
 	.driver = {
 		   .name = "wm831x-status",
 		   },
 	.probe = wm831x_status_probe,
 	.remove = wm831x_status_remove,
 };

 module_platform_driver(wm831x_status_driver);

 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 MODULE_DESCRIPTION("WM831x status LED driver");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:wm831x-status");
	/*
	* LED driver for WM831x status LEDs
	*
	* Copyright(C) 2009 Wolfson Microelectronics PLC.
	*
	* 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/platform_device.h>
	#include <linux/slab.h>
	#include <linux/leds.h>
	#include <linux/err.h>
	#include <linux/mfd/wm831x/core.h>
	#include <linux/mfd/wm831x/pdata.h>
	#include <linux/mfd/wm831x/status.h>
	#include <linux/module.h>


	struct wm831x_status {
	struct led_classdev cdev;
	struct wm831x *wm831x;
	struct work_struct work;
	struct mutex mutex;

	spinlock_t value_lock;
	int reg; /* Control register */
	int reg_val; /* Control register value */

	int blink;
	int blink_time;
	int blink_cyc;
	int src;
	enum led_brightness brightness;
	};

	#define to_wm831x_status(led_cdev) \
	container_of(led_cdev, struct wm831x_status, cdev)

	static void wm831x_status_work(struct work_struct *work)
	{
	struct wm831x_status *led = container_of(work, struct wm831x_status,
	work);
	unsigned long flags;

	mutex_lock(&led->mutex);

	led->reg_val &= ~(WM831X_LED_SRC_MASK \| WM831X_LED_MODE_MASK \|
	WM831X_LED_DUTY_CYC_MASK \| WM831X_LED_DUR_MASK);

	spin_lock_irqsave(&led->value_lock, flags);

	led->reg_val \|= led->src << WM831X_LED_SRC_SHIFT;
	if (led->blink) {
	led->reg_val \|= 2 << WM831X_LED_MODE_SHIFT;
	led->reg_val \|= led->blink_time << WM831X_LED_DUR_SHIFT;
	led->reg_val \|= led->blink_cyc;
	} else {
	if (led->brightness != LED_OFF)
	led->reg_val \|= 1 << WM831X_LED_MODE_SHIFT;
	}

	spin_unlock_irqrestore(&led->value_lock, flags);

	wm831x_reg_write(led->wm831x, led->reg, led->reg_val);

	mutex_unlock(&led->mutex);
	}

	static void wm831x_status_set(struct led_classdev *led_cdev,
	enum led_brightness value)
	{
	struct wm831x_status *led = to_wm831x_status(led_cdev);
	unsigned long flags;

	spin_lock_irqsave(&led->value_lock, flags);
	led->brightness = value;
	if (value == LED_OFF)
	led->blink = 0;
	schedule_work(&led->work);
	spin_unlock_irqrestore(&led->value_lock, flags);
	}

	static int wm831x_status_blink_set(struct led_classdev *led_cdev,
	unsigned long *delay_on,
	unsigned long *delay_off)
	{
	struct wm831x_status *led = to_wm831x_status(led_cdev);
	unsigned long flags;
	int ret = 0;

	/* Pick some defaults if we've not been given times */
	if (delay_on == 0 && delay_off == 0) {
	*delay_on = 250;
	*delay_off = 250;
	}

	spin_lock_irqsave(&led->value_lock, flags);

	/* We only have a limited selection of settings, see if we can
	* support the configuration we're being given */
	switch (*delay_on) {
	case 1000:
	led->blink_time = 0;
	break;
	case 250:
	led->blink_time = 1;
	break;
	case 125:
	led->blink_time = 2;
	break;
	case 62:
	case 63:
	/* Actually 62.5ms */
	led->blink_time = 3;
	break;
	default:
	ret = -EINVAL;
	break;
	}

	if (ret == 0) {
	switch (delay_off / delay_on) {
	case 1:
	led->blink_cyc = 0;
	break;
	case 3:
	led->blink_cyc = 1;
	break;
	case 4:
	led->blink_cyc = 2;
	break;
	case 8:
	led->blink_cyc = 3;
	break;
	default:
	ret = -EINVAL;
	break;
	}
	}

	if (ret == 0)
	led->blink = 1;
	else
	led->blink = 0;

	/* Always update; if we fail turn off blinking since we expect
	* a software fallback. */
	schedule_work(&led->work);

	spin_unlock_irqrestore(&led->value_lock, flags);

	return ret;
	}

	static const char * const led_src_texts[] = {
	"otp",
	"power",
	"charger",
	"soft",
	};

	static ssize_t wm831x_status_src_show(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct wm831x_status *led = to_wm831x_status(led_cdev);
	int i;
	ssize_t ret = 0;

	mutex_lock(&led->mutex);

	for (i = 0; i < ARRAY_SIZE(led_src_texts); i++)
	if (i == led->src)
	ret += sprintf(&buf[ret], "[%s] ", led_src_texts[i]);
	else
	ret += sprintf(&buf[ret], "%s ", led_src_texts[i]);

	mutex_unlock(&led->mutex);

	ret += sprintf(&buf[ret], "\n");

	return ret;
	}

	static ssize_t wm831x_status_src_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t size)
	{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct wm831x_status *led = to_wm831x_status(led_cdev);
	char name[20];
	int i;
	size_t len;

	name[sizeof(name) - 1] = '\0';
	strncpy(name, buf, sizeof(name) - 1);
	len = strlen(name);

	if (len && name[len - 1] == '\n')
	name[len - 1] = '\0';

	for (i = 0; i < ARRAY_SIZE(led_src_texts); i++) {
	if (!strcmp(name, led_src_texts[i])) {
	mutex_lock(&led->mutex);

	led->src = i;
	schedule_work(&led->work);

	mutex_unlock(&led->mutex);
	}
	}

	return size;
	}

	static DEVICE_ATTR(src, 0644, wm831x_status_src_show, wm831x_status_src_store);

	static struct attribute *wm831x_status_attrs[] = {
	&dev_attr_src.attr,
	NULL
	};
	ATTRIBUTE_GROUPS(wm831x_status);

	static int wm831x_status_probe(struct platform_device *pdev)
	{
	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
	struct wm831x_pdata *chip_pdata;
	struct wm831x_status_pdata pdata;
	struct wm831x_status *drvdata;
	struct resource *res;
	int id = pdev->id % ARRAY_SIZE(chip_pdata->status);
	int ret;

	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
	if (res == NULL) {
	dev_err(&pdev->dev, "No register resource\n");
	return -EINVAL;
	}

	drvdata = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_status),
	GFP_KERNEL);
	if (!drvdata)
	return -ENOMEM;
	platform_set_drvdata(pdev, drvdata);

	drvdata->wm831x = wm831x;
	drvdata->reg = res->start;

	if (dev_get_platdata(wm831x->dev))
	chip_pdata = dev_get_platdata(wm831x->dev);
	else
	chip_pdata = NULL;

	memset(&pdata, 0, sizeof(pdata));
	if (chip_pdata && chip_pdata->status[id])
	memcpy(&pdata, chip_pdata->status[id], sizeof(pdata));
	else
	pdata.name = dev_name(&pdev->dev);

	mutex_init(&drvdata->mutex);
	INIT_WORK(&drvdata->work, wm831x_status_work);
	spin_lock_init(&drvdata->value_lock);

	/* We cache the configuration register and read startup values
	* from it. */
	drvdata->reg_val = wm831x_reg_read(wm831x, drvdata->reg);

	if (drvdata->reg_val & WM831X_LED_MODE_MASK)
	drvdata->brightness = LED_FULL;
	else
	drvdata->brightness = LED_OFF;

	/* Set a default source if configured, otherwise leave the
	* current hardware setting.
	*/
	if (pdata.default_src == WM831X_STATUS_PRESERVE) {
	drvdata->src = drvdata->reg_val;
	drvdata->src &= WM831X_LED_SRC_MASK;
	drvdata->src >>= WM831X_LED_SRC_SHIFT;
	} else {
	drvdata->src = pdata.default_src - 1;
	}

	drvdata->cdev.name = pdata.name;
	drvdata->cdev.default_trigger = pdata.default_trigger;
	drvdata->cdev.brightness_set = wm831x_status_set;
	drvdata->cdev.blink_set = wm831x_status_blink_set;
	drvdata->cdev.groups = wm831x_status_groups;

	ret = led_classdev_register(wm831x->dev, &drvdata->cdev);
	if (ret < 0) {
	dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
	return ret;
	}

	return 0;
	}

	static int wm831x_status_remove(struct platform_device *pdev)
	{
	struct wm831x_status *drvdata = platform_get_drvdata(pdev);

	led_classdev_unregister(&drvdata->cdev);

	return 0;
	}

	static struct platform_driver wm831x_status_driver = {
	.driver = {
	.name = "wm831x-status",
	},
	.probe = wm831x_status_probe,
	.remove = wm831x_status_remove,
	};

	module_platform_driver(wm831x_status_driver);

	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	MODULE_DESCRIPTION("WM831x status LED driver");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:wm831x-status");