[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 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");
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;
	26	struct work_struct work;
	27	struct mutex mutex;
	28
	29	spinlock_t value_lock;
	30	int reg; /* Control register */
	31	int reg_val; /* Control register value */
	32
	33	int blink;
	34	int blink_time;
	35	int blink_cyc;
	36	int src;
	37	enum led_brightness brightness;
	38	};
	39
	40	#define to_wm831x_status(led_cdev) \
	41	container_of(led_cdev, struct wm831x_status, cdev)
	42
	43	static void wm831x_status_work(struct work_struct *work)
	44	{
	45	struct wm831x_status *led = container_of(work, struct wm831x_status,
	46	work);
	47	unsigned long flags;
	48
	49	mutex_lock(&led->mutex);
	50
	51	led->reg_val &= ~(WM831X_LED_SRC_MASK \| WM831X_LED_MODE_MASK \|
	52	WM831X_LED_DUTY_CYC_MASK \| WM831X_LED_DUR_MASK);
	53
	54	spin_lock_irqsave(&led->value_lock, flags);
	55
	56	led->reg_val \|= led->src << WM831X_LED_SRC_SHIFT;
	57	if (led->blink) {
	58	led->reg_val \|= 2 << WM831X_LED_MODE_SHIFT;
	59	led->reg_val \|= led->blink_time << WM831X_LED_DUR_SHIFT;
	60	led->reg_val \|= led->blink_cyc;
	61	} else {
	62	if (led->brightness != LED_OFF)
	63	led->reg_val \|= 1 << WM831X_LED_MODE_SHIFT;
	64	}
	65
	66	spin_unlock_irqrestore(&led->value_lock, flags);
	67
	68	wm831x_reg_write(led->wm831x, led->reg, led->reg_val);
	69
	70	mutex_unlock(&led->mutex);
	71	}
	72
	73	static void wm831x_status_set(struct led_classdev *led_cdev,
	74	enum led_brightness value)
	75	{
	76	struct wm831x_status *led = to_wm831x_status(led_cdev);
	77	unsigned long flags;
	78
	79	spin_lock_irqsave(&led->value_lock, flags);
	80	led->brightness = value;
	81	if (value == LED_OFF)
	82	led->blink = 0;
	83	schedule_work(&led->work);
	84	spin_unlock_irqrestore(&led->value_lock, flags);
85	}
86
87	static int wm831x_status_blink_set(struct led_classdev *led_cdev,
88	unsigned long *delay_on,
89	unsigned long *delay_off)
90	{
91	struct wm831x_status *led = to_wm831x_status(led_cdev);
92	unsigned long flags;
93	int ret = 0;
94
95	/* Pick some defaults if we've not been given times */
96	if (delay_on == 0 && delay_off == 0) {
97	*delay_on = 250;
98	*delay_off = 250;
99	}
100
101	spin_lock_irqsave(&led->value_lock, flags);
102
103	/* We only have a limited selection of settings, see if we can
104	* support the configuration we're being given */
105	switch (*delay_on) {
106	case 1000:
107	led->blink_time = 0;
108	break;
109	case 250:
110	led->blink_time = 1;
111	break;
112	case 125:
113	led->blink_time = 2;
114	break;
115	case 62:
116	case 63:
117	/* Actually 62.5ms */
118	led->blink_time = 3;
119	break;
120	default:
121	ret = -EINVAL;
122	break;
123	}
124
125	if (ret == 0) {
126	switch (delay_off / delay_on) {
127	case 1:
128	led->blink_cyc = 0;
129	break;
130	case 3:
131	led->blink_cyc = 1;
132	break;
133	case 4:
134	led->blink_cyc = 2;
135	break;
136	case 8:
137	led->blink_cyc = 3;
138	break;
139	default:
140	ret = -EINVAL;
141	break;
142	}
143	}
144
145	if (ret == 0)
146	led->blink = 1;
147	else
148	led->blink = 0;
149
150	/* Always update; if we fail turn off blinking since we expect
151	* a software fallback. */
152	schedule_work(&led->work);
153
154	spin_unlock_irqrestore(&led->value_lock, flags);
155
156	return ret;
157	}
158
8a4529a3	159	static const char * const led_src_texts[] = {
c746b551 MB	160	"otp",
	161	"power",
	162	"charger",
	163	"soft",
	164	};
	165
	166	static ssize_t wm831x_status_src_show(struct device *dev,
	167	struct device_attribute attr, char buf)
	168	{
	169	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	170	struct wm831x_status *led = to_wm831x_status(led_cdev);
	171	int i;
	172	ssize_t ret = 0;
	173
	174	mutex_lock(&led->mutex);
	175
	176	for (i = 0; i < ARRAY_SIZE(led_src_texts); i++)
	177	if (i == led->src)
	178	ret += sprintf(&buf[ret], "[%s] ", led_src_texts[i]);
	179	else
	180	ret += sprintf(&buf[ret], "%s ", led_src_texts[i]);
	181
	182	mutex_unlock(&led->mutex);
	183
	184	ret += sprintf(&buf[ret], "\n");
	185
	186	return ret;
	187	}
	188
	189	static ssize_t wm831x_status_src_store(struct device *dev,
	190	struct device_attribute *attr,
	191	const char *buf, size_t size)
	192	{
	193	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	194	struct wm831x_status *led = to_wm831x_status(led_cdev);
	195	char name[20];
	196	int i;
	197	size_t len;
	198
	199	name[sizeof(name) - 1] = '\0';
	200	strncpy(name, buf, sizeof(name) - 1);
	201	len = strlen(name);
	202
	203	if (len && name[len - 1] == '\n')
	204	name[len - 1] = '\0';
	205
	206	for (i = 0; i < ARRAY_SIZE(led_src_texts); i++) {
	207	if (!strcmp(name, led_src_texts[i])) {
	208	mutex_lock(&led->mutex);
	209
	210	led->src = i;
	211	schedule_work(&led->work);
	212
	213	mutex_unlock(&led->mutex);
	214	}
	215	}
	216
	217	return size;
	218	}
	219
	220	static DEVICE_ATTR(src, 0644, wm831x_status_src_show, wm831x_status_src_store);
	221
b2015ed5 JH	222	static struct attribute *wm831x_status_attrs[] = {
	223	&dev_attr_src.attr,
	224	NULL
	225	};
	226	ATTRIBUTE_GROUPS(wm831x_status);
	227
c746b551 MB	228	static int wm831x_status_probe(struct platform_device *pdev)
	229	{
	230	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
	231	struct wm831x_pdata *chip_pdata;
	232	struct wm831x_status_pdata pdata;
	233	struct wm831x_status *drvdata;
	234	struct resource *res;
	235	int id = pdev->id % ARRAY_SIZE(chip_pdata->status);
	236	int ret;
	237
61abeba5	238	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
c746b551	239	if (res == NULL) {
61abeba5	240	dev_err(&pdev->dev, "No register resource\n");
b2015ed5	241	return -EINVAL;
c746b551 MB	242	}
c746b551 MB	243
1713cb9d MB	244	drvdata = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_status),
1713cb9d MB	245	GFP_KERNEL);
c746b551 MB	246	if (!drvdata)
c746b551 MB	247	return -ENOMEM;
84196a2f	248	platform_set_drvdata(pdev, drvdata);
c746b551 MB	249
	250	drvdata->wm831x = wm831x;
	251	drvdata->reg = res->start;
	252
87aae1ea JH	253	if (dev_get_platdata(wm831x->dev))
87aae1ea JH	254	chip_pdata = dev_get_platdata(wm831x->dev);
c746b551 MB	255	else
	256	chip_pdata = NULL;
	257
	258	memset(&pdata, 0, sizeof(pdata));
	259	if (chip_pdata && chip_pdata->status[id])
	260	memcpy(&pdata, chip_pdata->status[id], sizeof(pdata));
	261	else
	262	pdata.name = dev_name(&pdev->dev);
	263
	264	mutex_init(&drvdata->mutex);
	265	INIT_WORK(&drvdata->work, wm831x_status_work);
	266	spin_lock_init(&drvdata->value_lock);
	267
	268	/* We cache the configuration register and read startup values
	269	* from it. */
	270	drvdata->reg_val = wm831x_reg_read(wm831x, drvdata->reg);
	271
	272	if (drvdata->reg_val & WM831X_LED_MODE_MASK)
	273	drvdata->brightness = LED_FULL;
	274	else
	275	drvdata->brightness = LED_OFF;
	276
	277	/* Set a default source if configured, otherwise leave the
	278	* current hardware setting.
	279	*/
	280	if (pdata.default_src == WM831X_STATUS_PRESERVE) {
	281	drvdata->src = drvdata->reg_val;
	282	drvdata->src &= WM831X_LED_SRC_MASK;
	283	drvdata->src >>= WM831X_LED_SRC_SHIFT;
	284	} else {
	285	drvdata->src = pdata.default_src - 1;
	286	}
	287
	288	drvdata->cdev.name = pdata.name;
	289	drvdata->cdev.default_trigger = pdata.default_trigger;
	290	drvdata->cdev.brightness_set = wm831x_status_set;
	291	drvdata->cdev.blink_set = wm831x_status_blink_set;
b2015ed5	292	drvdata->cdev.groups = wm831x_status_groups;
c746b551 MB	293
	294	ret = led_classdev_register(wm831x->dev, &drvdata->cdev);
	295	if (ret < 0) {
	296	dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
b2015ed5	297	return ret;
c746b551 MB	298	}
c746b551 MB	299
c746b551	300	return 0;
c746b551 MB	301	}
	302
	303	static int wm831x_status_remove(struct platform_device *pdev)
	304	{
	305	struct wm831x_status *drvdata = platform_get_drvdata(pdev);
	306
c746b551	307	led_classdev_unregister(&drvdata->cdev);
c746b551 MB	308
	309	return 0;
	310	}
	311
	312	static struct platform_driver wm831x_status_driver = {
	313	.driver = {
	314	.name = "wm831x-status",
c746b551 MB	315	},
	316	.probe = wm831x_status_probe,
	317	.remove = wm831x_status_remove,
	318	};
	319
892a8843	320	module_platform_driver(wm831x_status_driver);
c746b551 MB	321
	322	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	323	MODULE_DESCRIPTION("WM831x status LED driver");
	324	MODULE_LICENSE("GPL");
	325	MODULE_ALIAS("platform:wm831x-status");