[net-next-2.6.git] / drivers / leds / leds-88pm860x.c

/*
 * LED driver for Marvell 88PM860x
 *
 * Copyright (C) 2009 Marvell International Ltd.
 *	Haojian Zhuang <haojian.zhuang@marvell.com>
 *
 * 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/slab.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 <haojian.zhuang@marvell.com>");
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 <haojian.zhuang@marvell.com>
	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>
5a0e3ad6	18	#include <linux/slab.h>
0a2f915b HZ	19	#include <linux/workqueue.h>
	20	#include <linux/mfd/88pm860x.h>
	21
	22	#define LED_PWM_SHIFT (3)
	23	#define LED_PWM_MASK (0x1F)
	24	#define LED_CURRENT_MASK (0x07 << 5)
	25
	26	#define LED_BLINK_ON_MASK (0x07)
	27	#define LED_BLINK_PERIOD_MASK (0x0F << 3)
	28	#define LED_BLINK_MASK (0x7F)
	29
	30	#define LED_BLINK_ON(x) ((x & 0x7) * 66 + 66)
	31	#define LED_BLINK_PERIOD(x) ((x & 0xF) * 530 + 930)
	32	#define LED_BLINK_ON_MIN LED_BLINK_ON(0)
	33	#define LED_BLINK_ON_MAX LED_BLINK_ON(0x7)
	34	#define LED_BLINK_PERIOD_MIN LED_BLINK_PERIOD(0)
	35	#define LED_BLINK_PERIOD_MAX LED_BLINK_PERIOD(0xE)
	36	#define LED_TO_ON(x) ((x - 66) / 66)
	37	#define LED_TO_PERIOD(x) ((x - 930) / 530)
	38
	39	#define LED1_BLINK_EN (1 << 1)
	40	#define LED2_BLINK_EN (1 << 2)
	41
	42	enum {
	43	SET_BRIGHTNESS,
	44	SET_BLINK,
	45	};
	46
	47	struct pm860x_led {
	48	struct led_classdev cdev;
	49	struct i2c_client *i2c;
	50	struct work_struct work;
	51	struct pm860x_chip *chip;
	52	struct mutex lock;
	53	char name[MFD_NAME_SIZE];
	54
	55	int port;
	56	int iset;
	57	int command;
	58	int offset;
	59	unsigned char brightness;
	60	unsigned char current_brightness;
	61
	62	int blink_data;
	63	int blink_time;
	64	int blink_on;
	65	int blink_off;
	66	};
	67
	68	/* return offset of color register */
	69	static inline int __led_off(int port)
	70	{
	71	int ret = -EINVAL;
	72
	73	switch (port) {
	74	case PM8606_LED1_RED:
	75	case PM8606_LED1_GREEN:
	76	case PM8606_LED1_BLUE:
	77	ret = port - PM8606_LED1_RED + PM8606_RGB1B;
	78	break;
	79	case PM8606_LED2_RED:
	80	case PM8606_LED2_GREEN:
	81	case PM8606_LED2_BLUE:
	82	ret = port - PM8606_LED2_RED + PM8606_RGB2B;
83	break;
84	}
85	return ret;
86	}
87
88	/* return offset of blink register */
89	static inline int __blink_off(int port)
90	{
91	int ret = -EINVAL;
92
93	switch (port) {
94	case PM8606_LED1_RED:
95	case PM8606_LED1_GREEN:
96	case PM8606_LED1_BLUE:
97	ret = PM8606_RGB1A;
98	case PM8606_LED2_RED:
99	case PM8606_LED2_GREEN:
100	case PM8606_LED2_BLUE:
101	ret = PM8606_RGB2A;
102	}
103	return ret;
104	}
105
106	static inline int __blink_ctl_mask(int port)
107	{
108	int ret = -EINVAL;
109
110	switch (port) {
111	case PM8606_LED1_RED:
112	case PM8606_LED1_GREEN:
113	case PM8606_LED1_BLUE:
114	ret = LED1_BLINK_EN;
115	break;
116	case PM8606_LED2_RED:
117	case PM8606_LED2_GREEN:
118	case PM8606_LED2_BLUE:
119	ret = LED2_BLINK_EN;
120	break;
121	}
122	return ret;
123	}
124
125	static int __led_set(struct pm860x_led *led, int command)
126	{
127	struct pm860x_chip *chip = led->chip;
128	int mask, ret;
129
130	mutex_lock(&led->lock);
131	switch (command) {
132	case SET_BRIGHTNESS:
133	if ((led->current_brightness == 0) && led->brightness) {
134	if (led->iset) {
135	ret = pm860x_set_bits(led->i2c, led->offset,
136	LED_CURRENT_MASK, led->iset);
137	if (ret < 0)
138	goto out;
139	}
140	} else if (led->brightness == 0) {
141	ret = pm860x_set_bits(led->i2c, led->offset,
142	LED_CURRENT_MASK, 0);
143	if (ret < 0)
144	goto out;
145	}
146	ret = pm860x_set_bits(led->i2c, led->offset, LED_PWM_MASK,
147	led->brightness);
148	if (ret < 0)
149	goto out;
150	led->current_brightness = led->brightness;
151	dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
152	led->offset, led->brightness);
153	break;
154	case SET_BLINK:
155	ret = pm860x_set_bits(led->i2c, led->offset,
156	LED_BLINK_MASK, led->blink_data);
157	if (ret < 0)
158	goto out;
159
160	mask = __blink_ctl_mask(led->port);
161	ret = pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, mask);
162	if (ret < 0)
163	goto out;
164	dev_dbg(chip->dev, "LED blink delay on:%dms, delay off:%dms\n",
165	led->blink_on, led->blink_off);
166	break;
167	}
168	out:
169	mutex_unlock(&led->lock);
170	return 0;
171	}
172
173	static void pm860x_led_work(struct work_struct *work)
174	{
175	struct pm860x_led *led;
176
177	led = container_of(work, struct pm860x_led, work);
178	__led_set(led, led->command);
179	}
180
181	static void pm860x_led_set(struct led_classdev *cdev,
182	enum led_brightness value)
183	{
184	struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);
185
186	data->offset = __led_off(data->port);
187	data->brightness = value >> 3;
188	data->command = SET_BRIGHTNESS;
189	schedule_work(&data->work);
190	}
191
192	static int pm860x_led_blink(struct led_classdev *cdev,
193	unsigned long *delay_on,
194	unsigned long *delay_off)
195	{
196	struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);
197	int period, on;
198
199	on = *delay_on;
200	if ((on < LED_BLINK_ON_MIN) \|\| (on > LED_BLINK_ON_MAX))
201	return -EINVAL;
202
203	on = LED_TO_ON(on);
204	on = LED_BLINK_ON(on);
205
206	period = on + *delay_off;
207	if ((period < LED_BLINK_PERIOD_MIN) \|\| (period > LED_BLINK_PERIOD_MAX))
208	return -EINVAL;
209	period = LED_TO_PERIOD(period);
210	period = LED_BLINK_PERIOD(period);
211
212	data->offset = __blink_off(data->port);
213	data->blink_on = on;
214	data->blink_off = period - data->blink_on;
215	data->blink_data = (period << 3) \| data->blink_on;
216	data->command = SET_BLINK;
217	schedule_work(&data->work);
218
219	return 0;
220	}
221
222	static int __check_device(struct pm860x_led_pdata pdata, char name)
223	{
224	struct pm860x_led_pdata *p = pdata;
225	int ret = -EINVAL;
226
227	while (p && p->id) {
228	if ((p->id != PM8606_ID_LED) \|\| (p->flags < 0))
229	break;
230
231	if (!strncmp(name, pm860x_led_name[p->flags],
232	MFD_NAME_SIZE)) {
233	ret = (int)p->flags;
234	break;
235	}
236	p++;
237	}
238	return ret;
239	}
240
241	static int pm860x_led_probe(struct platform_device *pdev)
242	{
243	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
244	struct pm860x_platform_data *pm860x_pdata;
245	struct pm860x_led_pdata *pdata;
246	struct pm860x_led *data;
247	struct resource *res;
248	int ret;
249
250	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
251	if (res == NULL) {
252	dev_err(&pdev->dev, "No I/O resource!\n");
253	return -EINVAL;
254	}
255
256	if (pdev->dev.parent->platform_data) {
257	pm860x_pdata = pdev->dev.parent->platform_data;
258	pdata = pm860x_pdata->led;
259	} else
260	pdata = NULL;
261
262	data = kzalloc(sizeof(struct pm860x_led), GFP_KERNEL);
263	if (data == NULL)
264	return -ENOMEM;
265	strncpy(data->name, res->name, MFD_NAME_SIZE);
266	dev_set_drvdata(&pdev->dev, data);
267	data->chip = chip;
268	data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
269	data->iset = pdata->iset;
270	data->port = __check_device(pdata, data->name);
271	if (data->port < 0)
272	return -EINVAL;
273
274	data->current_brightness = 0;
275	data->cdev.name = data->name;
276	data->cdev.brightness_set = pm860x_led_set;
277	data->cdev.blink_set = pm860x_led_blink;
278	mutex_init(&data->lock);
279	INIT_WORK(&data->work, pm860x_led_work);
280
281	ret = led_classdev_register(chip->dev, &data->cdev);
282	if (ret < 0) {
283	dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
284	goto out;
285	}
286	return 0;
287	out:
288	kfree(data);
289	return ret;
290	}
291
292	static int pm860x_led_remove(struct platform_device *pdev)
293	{
294	struct pm860x_led *data = platform_get_drvdata(pdev);
295
296	led_classdev_unregister(&data->cdev);
297	kfree(data);
298
299	return 0;
300	}
301
302	static struct platform_driver pm860x_led_driver = {
303	.driver = {
304	.name = "88pm860x-led",
305	.owner = THIS_MODULE,
306	},
307	.probe = pm860x_led_probe,
308	.remove = pm860x_led_remove,
309	};
310
311	static int __devinit pm860x_led_init(void)
312	{
313	return platform_driver_register(&pm860x_led_driver);
314	}
315	module_init(pm860x_led_init);
316
317	static void __devexit pm860x_led_exit(void)
318	{
319	platform_driver_unregister(&pm860x_led_driver);
320	}
321	module_exit(pm860x_led_exit);
322
323	MODULE_DESCRIPTION("LED driver for Marvell PM860x");
324	MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
325	MODULE_LICENSE("GPL");
326	MODULE_ALIAS("platform:88pm860x-led");