[linux-2.6-block.git] / drivers / leds / leds-wm831x-status.c

/*
 * 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 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_set(struct wm831x_status *led)
{
	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 int wm831x_status_brightness_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;
	spin_unlock_irqrestore(&led->value_lock, flags);
	wm831x_status_set(led);

	return 0;
}

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;

	spin_unlock_irqrestore(&led->value_lock, flags);
	wm831x_status_set(led);

	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);
	int i;

	i = sysfs_match_string(led_src_texts, buf);
	if (i >= 0) {
		mutex_lock(&led->mutex);
		led->src = i;
		mutex_unlock(&led->mutex);
		wm831x_status_set(led);
	}

	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;

	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);
	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_blocking = wm831x_status_brightness_set;
	drvdata->cdev.blink_set = wm831x_status_blink_set;
	drvdata->cdev.groups = wm831x_status_groups;

	ret = devm_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 struct platform_driver wm831x_status_driver = {
	.driver = {
		   .name = "wm831x-status",
		   },
	.probe = wm831x_status_probe,
};

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");
Commit	Line	Data
c746b551 MB	1	/*
	2	* LED driver for WM831x status LEDs
	3	*
	4	* Copyright(C) 2009 Wolfson Microelectronics PLC.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*
	10	*/
	11
	12	#include <linux/kernel.h>
c746b551	13	#include <linux/platform_device.h>
5a0e3ad6	14	#include <linux/slab.h>
c746b551 MB	15	#include <linux/leds.h>
	16	#include <linux/err.h>
	17	#include <linux/mfd/wm831x/core.h>
	18	#include <linux/mfd/wm831x/pdata.h>
	19	#include <linux/mfd/wm831x/status.h>
54f4dedb	20	#include <linux/module.h>
c746b551 MB	21
	22
	23	struct wm831x_status {
	24	struct led_classdev cdev;
	25	struct wm831x *wm831x;
c746b551 MB	26	struct mutex mutex;
	27
	28	spinlock_t value_lock;
	29	int reg; /* Control register */
	30	int reg_val; /* Control register value */
	31
	32	int blink;
	33	int blink_time;
	34	int blink_cyc;
	35	int src;
	36	enum led_brightness brightness;
	37	};
	38
	39	#define to_wm831x_status(led_cdev) \
	40	container_of(led_cdev, struct wm831x_status, cdev)
	41
f633a512	42	static void wm831x_status_set(struct wm831x_status *led)
c746b551	43	{
c746b551 MB	44	unsigned long flags;
	45
	46	mutex_lock(&led->mutex);
	47
	48	led->reg_val &= ~(WM831X_LED_SRC_MASK \| WM831X_LED_MODE_MASK \|
	49	WM831X_LED_DUTY_CYC_MASK \| WM831X_LED_DUR_MASK);
	50
	51	spin_lock_irqsave(&led->value_lock, flags);
	52
	53	led->reg_val \|= led->src << WM831X_LED_SRC_SHIFT;
	54	if (led->blink) {
	55	led->reg_val \|= 2 << WM831X_LED_MODE_SHIFT;
	56	led->reg_val \|= led->blink_time << WM831X_LED_DUR_SHIFT;
	57	led->reg_val \|= led->blink_cyc;
	58	} else {
	59	if (led->brightness != LED_OFF)
	60	led->reg_val \|= 1 << WM831X_LED_MODE_SHIFT;
	61	}
	62
	63	spin_unlock_irqrestore(&led->value_lock, flags);
	64
	65	wm831x_reg_write(led->wm831x, led->reg, led->reg_val);
	66
	67	mutex_unlock(&led->mutex);
	68	}
	69
f633a512 AL	70	static int wm831x_status_brightness_set(struct led_classdev *led_cdev,
f633a512 AL	71	enum led_brightness value)
c746b551 MB	72	{
	73	struct wm831x_status *led = to_wm831x_status(led_cdev);
	74	unsigned long flags;
	75
	76	spin_lock_irqsave(&led->value_lock, flags);
	77	led->brightness = value;
	78	if (value == LED_OFF)
	79	led->blink = 0;
c746b551	80	spin_unlock_irqrestore(&led->value_lock, flags);
f633a512 AL	81	wm831x_status_set(led);
	82
	83	return 0;
c746b551 MB	84	}
	85
	86	static int wm831x_status_blink_set(struct led_classdev *led_cdev,
	87	unsigned long *delay_on,
	88	unsigned long *delay_off)
	89	{
	90	struct wm831x_status *led = to_wm831x_status(led_cdev);
	91	unsigned long flags;
	92	int ret = 0;
	93
	94	/* Pick some defaults if we've not been given times */
	95	if (delay_on == 0 && delay_off == 0) {
	96	*delay_on = 250;
	97	*delay_off = 250;
	98	}
	99
	100	spin_lock_irqsave(&led->value_lock, flags);
	101
	102	/* We only have a limited selection of settings, see if we can
	103	* support the configuration we're being given */
	104	switch (*delay_on) {
	105	case 1000:
	106	led->blink_time = 0;
	107	break;
	108	case 250:
	109	led->blink_time = 1;
	110	break;
	111	case 125:
	112	led->blink_time = 2;
	113	break;
	114	case 62:
	115	case 63:
	116	/* Actually 62.5ms */
	117	led->blink_time = 3;
	118	break;
	119	default:
	120	ret = -EINVAL;
	121	break;
	122	}
	123
	124	if (ret == 0) {
	125	switch (delay_off / delay_on) {
	126	case 1:
	127	led->blink_cyc = 0;
	128	break;
	129	case 3:
	130	led->blink_cyc = 1;
	131	break;
	132	case 4:
	133	led->blink_cyc = 2;
	134	break;
	135	case 8:
	136	led->blink_cyc = 3;
	137	break;
	138	default:
	139	ret = -EINVAL;
	140	break;
	141	}
	142	}
	143
	144	if (ret == 0)
	145	led->blink = 1;
	146	else
	147	led->blink = 0;
148
c746b551	149	spin_unlock_irqrestore(&led->value_lock, flags);
f633a512	150	wm831x_status_set(led);
c746b551 MB	151
	152	return ret;
	153	}
	154
8a4529a3	155	static const char * const led_src_texts[] = {
c746b551 MB	156	"otp",
	157	"power",
	158	"charger",
	159	"soft",
	160	};
	161
	162	static ssize_t wm831x_status_src_show(struct device *dev,
	163	struct device_attribute attr, char buf)
	164	{
	165	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	166	struct wm831x_status *led = to_wm831x_status(led_cdev);
	167	int i;
	168	ssize_t ret = 0;
	169
	170	mutex_lock(&led->mutex);
	171
	172	for (i = 0; i < ARRAY_SIZE(led_src_texts); i++)
	173	if (i == led->src)
	174	ret += sprintf(&buf[ret], "[%s] ", led_src_texts[i]);
	175	else
	176	ret += sprintf(&buf[ret], "%s ", led_src_texts[i]);
	177
	178	mutex_unlock(&led->mutex);
	179
	180	ret += sprintf(&buf[ret], "\n");
	181
	182	return ret;
	183	}
	184
	185	static ssize_t wm831x_status_src_store(struct device *dev,
	186	struct device_attribute *attr,
	187	const char *buf, size_t size)
	188	{
	189	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	190	struct wm831x_status *led = to_wm831x_status(led_cdev);
c746b551	191	int i;
c746b551	192
d54e5b52 AS	193	i = sysfs_match_string(led_src_texts, buf);
	194	if (i >= 0) {
	195	mutex_lock(&led->mutex);
	196	led->src = i;
	197	mutex_unlock(&led->mutex);
	198	wm831x_status_set(led);
c746b551 MB	199	}
	200
	201	return size;
	202	}
	203
	204	static DEVICE_ATTR(src, 0644, wm831x_status_src_show, wm831x_status_src_store);
	205
b2015ed5 JH	206	static struct attribute *wm831x_status_attrs[] = {
	207	&dev_attr_src.attr,
	208	NULL
	209	};
	210	ATTRIBUTE_GROUPS(wm831x_status);
	211
c746b551 MB	212	static int wm831x_status_probe(struct platform_device *pdev)
	213	{
	214	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
	215	struct wm831x_pdata *chip_pdata;
	216	struct wm831x_status_pdata pdata;
	217	struct wm831x_status *drvdata;
	218	struct resource *res;
	219	int id = pdev->id % ARRAY_SIZE(chip_pdata->status);
	220	int ret;
	221
61abeba5	222	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
c746b551	223	if (res == NULL) {
61abeba5	224	dev_err(&pdev->dev, "No register resource\n");
b2015ed5	225	return -EINVAL;
c746b551 MB	226	}
c746b551 MB	227
1713cb9d MB	228	drvdata = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_status),
1713cb9d MB	229	GFP_KERNEL);
c746b551 MB	230	if (!drvdata)
c746b551 MB	231	return -ENOMEM;
c746b551 MB	232
	233	drvdata->wm831x = wm831x;
	234	drvdata->reg = res->start;
	235
87aae1ea JH	236	if (dev_get_platdata(wm831x->dev))
87aae1ea JH	237	chip_pdata = dev_get_platdata(wm831x->dev);
c746b551 MB	238	else
	239	chip_pdata = NULL;
	240
	241	memset(&pdata, 0, sizeof(pdata));
	242	if (chip_pdata && chip_pdata->status[id])
	243	memcpy(&pdata, chip_pdata->status[id], sizeof(pdata));
	244	else
	245	pdata.name = dev_name(&pdev->dev);
	246
	247	mutex_init(&drvdata->mutex);
c746b551 MB	248	spin_lock_init(&drvdata->value_lock);
	249
	250	/* We cache the configuration register and read startup values
	251	* from it. */
	252	drvdata->reg_val = wm831x_reg_read(wm831x, drvdata->reg);
	253
	254	if (drvdata->reg_val & WM831X_LED_MODE_MASK)
	255	drvdata->brightness = LED_FULL;
	256	else
	257	drvdata->brightness = LED_OFF;
	258
	259	/* Set a default source if configured, otherwise leave the
	260	* current hardware setting.
	261	*/
	262	if (pdata.default_src == WM831X_STATUS_PRESERVE) {
	263	drvdata->src = drvdata->reg_val;
	264	drvdata->src &= WM831X_LED_SRC_MASK;
	265	drvdata->src >>= WM831X_LED_SRC_SHIFT;
	266	} else {
	267	drvdata->src = pdata.default_src - 1;
	268	}
	269
	270	drvdata->cdev.name = pdata.name;
	271	drvdata->cdev.default_trigger = pdata.default_trigger;
f633a512	272	drvdata->cdev.brightness_set_blocking = wm831x_status_brightness_set;
c746b551	273	drvdata->cdev.blink_set = wm831x_status_blink_set;
b2015ed5	274	drvdata->cdev.groups = wm831x_status_groups;
c746b551	275
8d3b6a40	276	ret = devm_led_classdev_register(wm831x->dev, &drvdata->cdev);
c746b551 MB	277	if (ret < 0) {
c746b551 MB	278	dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
b2015ed5	279	return ret;
c746b551 MB	280	}
c746b551 MB	281
c746b551	282	return 0;
c746b551 MB	283	}
c746b551 MB	284
c746b551 MB	285	static struct platform_driver wm831x_status_driver = {
	286	.driver = {
	287	.name = "wm831x-status",
c746b551 MB	288	},
c746b551 MB	289	.probe = wm831x_status_probe,
c746b551 MB	290	};
c746b551 MB	291
892a8843	292	module_platform_driver(wm831x_status_driver);
c746b551 MB	293
	294	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	295	MODULE_DESCRIPTION("WM831x status LED driver");
	296	MODULE_LICENSE("GPL");
	297	MODULE_ALIAS("platform:wm831x-status");