[linux.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/init.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 *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 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_IO, 0);
	if (res == NULL) {
		dev_err(&pdev->dev, "No I/O resource\n");
		ret = -EINVAL;
		goto err;
	}

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

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

	if (wm831x->dev->platform_data)
		chip_pdata = wm831x->dev->platform_data;
	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;

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

	ret = device_create_file(drvdata->cdev.dev, &dev_attr_src);
	if (ret != 0)
		dev_err(&pdev->dev,
			"No source control for LED: %d\n", ret);

	return 0;

err_led:
	led_classdev_unregister(&drvdata->cdev);
err:
	return ret;
}

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

	device_remove_file(drvdata->cdev.dev, &dev_attr_src);
	led_classdev_unregister(&drvdata->cdev);

	return 0;
}

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

module_platform_driver(wm831x_status_driver);

MODULE_AUTHOR("Mark Brown <[email protected]>");
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>
	13	#include <linux/init.h>
	14	#include <linux/platform_device.h>
5a0e3ad6	15	#include <linux/slab.h>
c746b551 MB	16	#include <linux/leds.h>
	17	#include <linux/err.h>
	18	#include <linux/mfd/wm831x/core.h>
	19	#include <linux/mfd/wm831x/pdata.h>
	20	#include <linux/mfd/wm831x/status.h>
54f4dedb	21	#include <linux/module.h>
c746b551 MB	22
	23
	24	struct wm831x_status {
	25	struct led_classdev cdev;
	26	struct wm831x *wm831x;
	27	struct work_struct work;
	28	struct mutex mutex;
	29
	30	spinlock_t value_lock;
	31	int reg; /* Control register */
	32	int reg_val; /* Control register value */
	33
	34	int blink;
	35	int blink_time;
	36	int blink_cyc;
	37	int src;
	38	enum led_brightness brightness;
	39	};
	40
	41	#define to_wm831x_status(led_cdev) \
	42	container_of(led_cdev, struct wm831x_status, cdev)
	43
	44	static void wm831x_status_work(struct work_struct *work)
	45	{
	46	struct wm831x_status *led = container_of(work, struct wm831x_status,
	47	work);
	48	unsigned long flags;
	49
	50	mutex_lock(&led->mutex);
	51
	52	led->reg_val &= ~(WM831X_LED_SRC_MASK \| WM831X_LED_MODE_MASK \|
	53	WM831X_LED_DUTY_CYC_MASK \| WM831X_LED_DUR_MASK);
	54
	55	spin_lock_irqsave(&led->value_lock, flags);
	56
	57	led->reg_val \|= led->src << WM831X_LED_SRC_SHIFT;
	58	if (led->blink) {
	59	led->reg_val \|= 2 << WM831X_LED_MODE_SHIFT;
	60	led->reg_val \|= led->blink_time << WM831X_LED_DUR_SHIFT;
	61	led->reg_val \|= led->blink_cyc;
	62	} else {
	63	if (led->brightness != LED_OFF)
	64	led->reg_val \|= 1 << WM831X_LED_MODE_SHIFT;
	65	}
	66
	67	spin_unlock_irqrestore(&led->value_lock, flags);
	68
	69	wm831x_reg_write(led->wm831x, led->reg, led->reg_val);
	70
	71	mutex_unlock(&led->mutex);
	72	}
	73
	74	static void wm831x_status_set(struct led_classdev *led_cdev,
	75	enum led_brightness value)
	76	{
	77	struct wm831x_status *led = to_wm831x_status(led_cdev);
	78	unsigned long flags;
	79
	80	spin_lock_irqsave(&led->value_lock, flags);
	81	led->brightness = value;
	82	if (value == LED_OFF)
	83	led->blink = 0;
	84	schedule_work(&led->work);
	85	spin_unlock_irqrestore(&led->value_lock, flags);
86	}
87
88	static int wm831x_status_blink_set(struct led_classdev *led_cdev,
89	unsigned long *delay_on,
90	unsigned long *delay_off)
91	{
92	struct wm831x_status *led = to_wm831x_status(led_cdev);
93	unsigned long flags;
94	int ret = 0;
95
96	/* Pick some defaults if we've not been given times */
97	if (delay_on == 0 && delay_off == 0) {
98	*delay_on = 250;
99	*delay_off = 250;
100	}
101
102	spin_lock_irqsave(&led->value_lock, flags);
103
104	/* We only have a limited selection of settings, see if we can
105	* support the configuration we're being given */
106	switch (*delay_on) {
107	case 1000:
108	led->blink_time = 0;
109	break;
110	case 250:
111	led->blink_time = 1;
112	break;
113	case 125:
114	led->blink_time = 2;
115	break;
116	case 62:
117	case 63:
118	/* Actually 62.5ms */
119	led->blink_time = 3;
120	break;
121	default:
122	ret = -EINVAL;
123	break;
124	}
125
126	if (ret == 0) {
127	switch (delay_off / delay_on) {
128	case 1:
129	led->blink_cyc = 0;
130	break;
131	case 3:
132	led->blink_cyc = 1;
133	break;
134	case 4:
135	led->blink_cyc = 2;
136	break;
137	case 8:
138	led->blink_cyc = 3;
139	break;
140	default:
141	ret = -EINVAL;
142	break;
143	}
144	}
145
146	if (ret == 0)
147	led->blink = 1;
148	else
149	led->blink = 0;
150
151	/* Always update; if we fail turn off blinking since we expect
152	* a software fallback. */
153	schedule_work(&led->work);
154
155	spin_unlock_irqrestore(&led->value_lock, flags);
156
157	return ret;
158	}
159
160	static const char *led_src_texts[] = {
161	"otp",
162	"power",
163	"charger",
164	"soft",
165	};
166
167	static ssize_t wm831x_status_src_show(struct device *dev,
168	struct device_attribute attr, char buf)
169	{
170	struct led_classdev *led_cdev = dev_get_drvdata(dev);
171	struct wm831x_status *led = to_wm831x_status(led_cdev);
172	int i;
173	ssize_t ret = 0;
174
175	mutex_lock(&led->mutex);
176
177	for (i = 0; i < ARRAY_SIZE(led_src_texts); i++)
178	if (i == led->src)
179	ret += sprintf(&buf[ret], "[%s] ", led_src_texts[i]);
180	else
181	ret += sprintf(&buf[ret], "%s ", led_src_texts[i]);
182
183	mutex_unlock(&led->mutex);
184
185	ret += sprintf(&buf[ret], "\n");
186
187	return ret;
188	}
189
190	static ssize_t wm831x_status_src_store(struct device *dev,
191	struct device_attribute *attr,
192	const char *buf, size_t size)
193	{
194	struct led_classdev *led_cdev = dev_get_drvdata(dev);
195	struct wm831x_status *led = to_wm831x_status(led_cdev);
196	char name[20];
197	int i;
198	size_t len;
199
200	name[sizeof(name) - 1] = '\0';
201	strncpy(name, buf, sizeof(name) - 1);
202	len = strlen(name);
203
204	if (len && name[len - 1] == '\n')
205	name[len - 1] = '\0';
206
207	for (i = 0; i < ARRAY_SIZE(led_src_texts); i++) {
208	if (!strcmp(name, led_src_texts[i])) {
209	mutex_lock(&led->mutex);
210
211	led->src = i;
212	schedule_work(&led->work);
213
214	mutex_unlock(&led->mutex);
215	}
216	}
217
218	return size;
219	}
220
221	static DEVICE_ATTR(src, 0644, wm831x_status_src_show, wm831x_status_src_store);
222
223	static int wm831x_status_probe(struct platform_device *pdev)
224	{
225	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
226	struct wm831x_pdata *chip_pdata;
227	struct wm831x_status_pdata pdata;
228	struct wm831x_status *drvdata;
229	struct resource *res;
230	int id = pdev->id % ARRAY_SIZE(chip_pdata->status);
231	int ret;
232
233	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
234	if (res == NULL) {
235	dev_err(&pdev->dev, "No I/O resource\n");
236	ret = -EINVAL;
237	goto err;
238	}
239
1713cb9d MB	240	drvdata = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_status),
1713cb9d MB	241	GFP_KERNEL);
c746b551 MB	242	if (!drvdata)
	243	return -ENOMEM;
	244	dev_set_drvdata(&pdev->dev, drvdata);
	245
	246	drvdata->wm831x = wm831x;
	247	drvdata->reg = res->start;
	248
	249	if (wm831x->dev->platform_data)
	250	chip_pdata = wm831x->dev->platform_data;
	251	else
	252	chip_pdata = NULL;
	253
	254	memset(&pdata, 0, sizeof(pdata));
	255	if (chip_pdata && chip_pdata->status[id])
	256	memcpy(&pdata, chip_pdata->status[id], sizeof(pdata));
	257	else
	258	pdata.name = dev_name(&pdev->dev);
	259
	260	mutex_init(&drvdata->mutex);
	261	INIT_WORK(&drvdata->work, wm831x_status_work);
	262	spin_lock_init(&drvdata->value_lock);
	263
	264	/* We cache the configuration register and read startup values
	265	* from it. */
	266	drvdata->reg_val = wm831x_reg_read(wm831x, drvdata->reg);
	267
	268	if (drvdata->reg_val & WM831X_LED_MODE_MASK)
	269	drvdata->brightness = LED_FULL;
	270	else
	271	drvdata->brightness = LED_OFF;
	272
	273	/* Set a default source if configured, otherwise leave the
	274	* current hardware setting.
	275	*/
	276	if (pdata.default_src == WM831X_STATUS_PRESERVE) {
	277	drvdata->src = drvdata->reg_val;
	278	drvdata->src &= WM831X_LED_SRC_MASK;
	279	drvdata->src >>= WM831X_LED_SRC_SHIFT;
	280	} else {
	281	drvdata->src = pdata.default_src - 1;
	282	}
	283
	284	drvdata->cdev.name = pdata.name;
	285	drvdata->cdev.default_trigger = pdata.default_trigger;
	286	drvdata->cdev.brightness_set = wm831x_status_set;
	287	drvdata->cdev.blink_set = wm831x_status_blink_set;
	288
	289	ret = led_classdev_register(wm831x->dev, &drvdata->cdev);
	290	if (ret < 0) {
	291	dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
	292	goto err_led;
	293	}
	294
	295	ret = device_create_file(drvdata->cdev.dev, &dev_attr_src);
	296	if (ret != 0)
	297	dev_err(&pdev->dev,
	298	"No source control for LED: %d\n", ret);
	299
	300	return 0;
	301
	302	err_led:
	303	led_classdev_unregister(&drvdata->cdev);
c746b551 MB	304	err:
	305	return ret;
	306	}
	307
	308	static int wm831x_status_remove(struct platform_device *pdev)
	309	{
	310	struct wm831x_status *drvdata = platform_get_drvdata(pdev);
	311
	312	device_remove_file(drvdata->cdev.dev, &dev_attr_src);
	313	led_classdev_unregister(&drvdata->cdev);
c746b551 MB	314
	315	return 0;
	316	}
	317
	318	static struct platform_driver wm831x_status_driver = {
	319	.driver = {
	320	.name = "wm831x-status",
	321	.owner = THIS_MODULE,
	322	},
	323	.probe = wm831x_status_probe,
	324	.remove = wm831x_status_remove,
	325	};
	326
892a8843	327	module_platform_driver(wm831x_status_driver);
c746b551 MB	328
	329	MODULE_AUTHOR("Mark Brown <[email protected]>");
	330	MODULE_DESCRIPTION("WM831x status LED driver");
	331	MODULE_LICENSE("GPL");
	332	MODULE_ALIAS("platform:wm831x-status");