[linux.git] / drivers / leds / leds-88pm860x.c

/*
 * LED driver for Marvell 88PM860x
 *
 * Copyright (C) 2009 Marvell International Ltd.
 *	Haojian Zhuang <[email protected]>
 *
 * 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/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
		pdata = NULL;

	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)
		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 <[email protected]>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:88pm860x-led");
Commit	Line	Data
0a2f915b HZ	1	/*
	2	* LED driver for Marvell 88PM860x
	3	*
	4	* Copyright (C) 2009 Marvell International Ltd.
	5	* Haojian Zhuang <[email protected]>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	*/
	12
	13	#include <linux/kernel.h>
	14	#include <linux/init.h>
	15	#include <linux/platform_device.h>
	16	#include <linux/i2c.h>
	17	#include <linux/leds.h>
	18	#include <linux/workqueue.h>
	19	#include <linux/mfd/88pm860x.h>
	20
	21	#define LED_PWM_SHIFT (3)
	22	#define LED_PWM_MASK (0x1F)
	23	#define LED_CURRENT_MASK (0x07 << 5)
	24
	25	#define LED_BLINK_ON_MASK (0x07)
	26	#define LED_BLINK_PERIOD_MASK (0x0F << 3)
	27	#define LED_BLINK_MASK (0x7F)
	28
	29	#define LED_BLINK_ON(x) ((x & 0x7) * 66 + 66)
	30	#define LED_BLINK_PERIOD(x) ((x & 0xF) * 530 + 930)
	31	#define LED_BLINK_ON_MIN LED_BLINK_ON(0)
	32	#define LED_BLINK_ON_MAX LED_BLINK_ON(0x7)
	33	#define LED_BLINK_PERIOD_MIN LED_BLINK_PERIOD(0)
	34	#define LED_BLINK_PERIOD_MAX LED_BLINK_PERIOD(0xE)
	35	#define LED_TO_ON(x) ((x - 66) / 66)
	36	#define LED_TO_PERIOD(x) ((x - 930) / 530)
	37
	38	#define LED1_BLINK_EN (1 << 1)
	39	#define LED2_BLINK_EN (1 << 2)
	40
	41	enum {
	42	SET_BRIGHTNESS,
	43	SET_BLINK,
	44	};
	45
	46	struct pm860x_led {
	47	struct led_classdev cdev;
	48	struct i2c_client *i2c;
	49	struct work_struct work;
	50	struct pm860x_chip *chip;
	51	struct mutex lock;
	52	char name[MFD_NAME_SIZE];
	53
	54	int port;
	55	int iset;
	56	int command;
	57	int offset;
	58	unsigned char brightness;
	59	unsigned char current_brightness;
	60
	61	int blink_data;
	62	int blink_time;
	63	int blink_on;
	64	int blink_off;
65	};
66
67	/* return offset of color register */
68	static inline int __led_off(int port)
69	{
70	int ret = -EINVAL;
71
72	switch (port) {
73	case PM8606_LED1_RED:
74	case PM8606_LED1_GREEN:
75	case PM8606_LED1_BLUE:
76	ret = port - PM8606_LED1_RED + PM8606_RGB1B;
77	break;
78	case PM8606_LED2_RED:
79	case PM8606_LED2_GREEN:
80	case PM8606_LED2_BLUE:
81	ret = port - PM8606_LED2_RED + PM8606_RGB2B;
82	break;
83	}
84	return ret;
85	}
86
87	/* return offset of blink register */
88	static inline int __blink_off(int port)
89	{
90	int ret = -EINVAL;
91
92	switch (port) {
93	case PM8606_LED1_RED:
94	case PM8606_LED1_GREEN:
95	case PM8606_LED1_BLUE:
96	ret = PM8606_RGB1A;
97	case PM8606_LED2_RED:
98	case PM8606_LED2_GREEN:
99	case PM8606_LED2_BLUE:
100	ret = PM8606_RGB2A;
101	}
102	return ret;
103	}
104
105	static inline int __blink_ctl_mask(int port)
106	{
107	int ret = -EINVAL;
108
109	switch (port) {
110	case PM8606_LED1_RED:
111	case PM8606_LED1_GREEN:
112	case PM8606_LED1_BLUE:
113	ret = LED1_BLINK_EN;
114	break;
115	case PM8606_LED2_RED:
116	case PM8606_LED2_GREEN:
117	case PM8606_LED2_BLUE:
118	ret = LED2_BLINK_EN;
119	break;
120	}
121	return ret;
122	}
123
124	static int __led_set(struct pm860x_led *led, int command)
125	{
126	struct pm860x_chip *chip = led->chip;
127	int mask, ret;
128
129	mutex_lock(&led->lock);
130	switch (command) {
131	case SET_BRIGHTNESS:
132	if ((led->current_brightness == 0) && led->brightness) {
133	if (led->iset) {
134	ret = pm860x_set_bits(led->i2c, led->offset,
135	LED_CURRENT_MASK, led->iset);
136	if (ret < 0)
137	goto out;
138	}
139	} else if (led->brightness == 0) {
140	ret = pm860x_set_bits(led->i2c, led->offset,
141	LED_CURRENT_MASK, 0);
142	if (ret < 0)
143	goto out;
144	}
145	ret = pm860x_set_bits(led->i2c, led->offset, LED_PWM_MASK,
146	led->brightness);
147	if (ret < 0)
148	goto out;
149	led->current_brightness = led->brightness;
150	dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
151	led->offset, led->brightness);
152	break;
153	case SET_BLINK:
154	ret = pm860x_set_bits(led->i2c, led->offset,
155	LED_BLINK_MASK, led->blink_data);
156	if (ret < 0)
157	goto out;
158
159	mask = __blink_ctl_mask(led->port);
160	ret = pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, mask);
161	if (ret < 0)
162	goto out;
163	dev_dbg(chip->dev, "LED blink delay on:%dms, delay off:%dms\n",
164	led->blink_on, led->blink_off);
165	break;
166	}
167	out:
168	mutex_unlock(&led->lock);
169	return 0;
170	}
171
172	static void pm860x_led_work(struct work_struct *work)
173	{
174	struct pm860x_led *led;
175
176	led = container_of(work, struct pm860x_led, work);
177	__led_set(led, led->command);
178	}
179
180	static void pm860x_led_set(struct led_classdev *cdev,
181	enum led_brightness value)
182	{
183	struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);
184
185	data->offset = __led_off(data->port);
186	data->brightness = value >> 3;
187	data->command = SET_BRIGHTNESS;
188	schedule_work(&data->work);
189	}
190
191	static int pm860x_led_blink(struct led_classdev *cdev,
192	unsigned long *delay_on,
193	unsigned long *delay_off)
194	{
195	struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);
196	int period, on;
197
198	on = *delay_on;
199	if ((on < LED_BLINK_ON_MIN) \|\| (on > LED_BLINK_ON_MAX))
200	return -EINVAL;
201
202	on = LED_TO_ON(on);
203	on = LED_BLINK_ON(on);
204
205	period = on + *delay_off;
206	if ((period < LED_BLINK_PERIOD_MIN) \|\| (period > LED_BLINK_PERIOD_MAX))
207	return -EINVAL;
208	period = LED_TO_PERIOD(period);
209	period = LED_BLINK_PERIOD(period);
210
211	data->offset = __blink_off(data->port);
212	data->blink_on = on;
213	data->blink_off = period - data->blink_on;
214	data->blink_data = (period << 3) \| data->blink_on;
215	data->command = SET_BLINK;
216	schedule_work(&data->work);
217
218	return 0;
219	}
220
221	static int __check_device(struct pm860x_led_pdata pdata, char name)
222	{
223	struct pm860x_led_pdata *p = pdata;
224	int ret = -EINVAL;
225
226	while (p && p->id) {
227	if ((p->id != PM8606_ID_LED) \|\| (p->flags < 0))
228	break;
229
230	if (!strncmp(name, pm860x_led_name[p->flags],
231	MFD_NAME_SIZE)) {
232	ret = (int)p->flags;
233	break;
234	}
235	p++;
236	}
237	return ret;
238	}
239
240	static int pm860x_led_probe(struct platform_device *pdev)
241	{
242	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
243	struct pm860x_platform_data *pm860x_pdata;
244	struct pm860x_led_pdata *pdata;
245	struct pm860x_led *data;
246	struct resource *res;
247	int ret;
248
249	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
250	if (res == NULL) {
251	dev_err(&pdev->dev, "No I/O resource!\n");
252	return -EINVAL;
253	}
254
255	if (pdev->dev.parent->platform_data) {
256	pm860x_pdata = pdev->dev.parent->platform_data;
257	pdata = pm860x_pdata->led;
258	} else
259	pdata = NULL;
260
261	data = kzalloc(sizeof(struct pm860x_led), GFP_KERNEL);
262	if (data == NULL)
263	return -ENOMEM;
264	strncpy(data->name, res->name, MFD_NAME_SIZE);
265	dev_set_drvdata(&pdev->dev, data);
266	data->chip = chip;
267	data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
268	data->iset = pdata->iset;
269	data->port = __check_device(pdata, data->name);
270	if (data->port < 0)
271	return -EINVAL;
272
273	data->current_brightness = 0;
274	data->cdev.name = data->name;
275	data->cdev.brightness_set = pm860x_led_set;
276	data->cdev.blink_set = pm860x_led_blink;
277	mutex_init(&data->lock);
278	INIT_WORK(&data->work, pm860x_led_work);
279
280	ret = led_classdev_register(chip->dev, &data->cdev);
281	if (ret < 0) {
282	dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
283	goto out;
284	}
285	return 0;
286	out:
287	kfree(data);
288	return ret;
289	}
290
291	static int pm860x_led_remove(struct platform_device *pdev)
292	{
293	struct pm860x_led *data = platform_get_drvdata(pdev);
294
295	led_classdev_unregister(&data->cdev);
296	kfree(data);
297
298	return 0;
299	}
300
301	static struct platform_driver pm860x_led_driver = {
302	.driver = {
303	.name = "88pm860x-led",
304	.owner = THIS_MODULE,
305	},
306	.probe = pm860x_led_probe,
307	.remove = pm860x_led_remove,
308	};
309
310	static int __devinit pm860x_led_init(void)
311	{
312	return platform_driver_register(&pm860x_led_driver);
313	}
314	module_init(pm860x_led_init);
315
316	static void __devexit pm860x_led_exit(void)
317	{
318	platform_driver_unregister(&pm860x_led_driver);
319	}
320	module_exit(pm860x_led_exit);
321
322	MODULE_DESCRIPTION("LED driver for Marvell PM860x");
323	MODULE_AUTHOR("Haojian Zhuang <[email protected]>");
324	MODULE_LICENSE("GPL");
325	MODULE_ALIAS("platform:88pm860x-led");