[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / leds / leds-lp3944.c

/*
 * leds-lp3944.c - driver for National Semiconductor LP3944 Funlight Chip
 *
 * Copyright (C) 2009 Antonio Ospite <ospite@studenti.unina.it>
 *
 * 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.
 *
 */

/*
 * I2C driver for National Semiconductor LP3944 Funlight Chip
 * http://www.national.com/pf/LP/LP3944.html
 *
 * This helper chip can drive up to 8 leds, with two programmable DIM modes;
 * it could even be used as a gpio expander but this driver assumes it is used
 * as a led controller.
 *
 * The DIM modes are used to set _blink_ patterns for leds, the pattern is
 * specified supplying two parameters:
 *   - period: from 0s to 1.6s
 *   - duty cycle: percentage of the period the led is on, from 0 to 100
 *
 * LP3944 can be found on Motorola A910 smartphone, where it drives the rgb
 * leds, the camera flash light and the displays backlights.
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/leds.h>
#include <linux/mutex.h>
#include <linux/workqueue.h>
#include <linux/leds-lp3944.h>

/* Read Only Registers */
#define LP3944_REG_INPUT1     0x00 /* LEDs 0-7 InputRegister (Read Only) */
#define LP3944_REG_REGISTER1  0x01 /* None (Read Only) */

#define LP3944_REG_PSC0       0x02 /* Frequency Prescaler 0 (R/W) */
#define LP3944_REG_PWM0       0x03 /* PWM Register 0 (R/W) */
#define LP3944_REG_PSC1       0x04 /* Frequency Prescaler 1 (R/W) */
#define LP3944_REG_PWM1       0x05 /* PWM Register 1 (R/W) */
#define LP3944_REG_LS0        0x06 /* LEDs 0-3 Selector (R/W) */
#define LP3944_REG_LS1        0x07 /* LEDs 4-7 Selector (R/W) */

/* These registers are not used to control leds in LP3944, they can store
 * arbitrary values which the chip will ignore.
 */
#define LP3944_REG_REGISTER8  0x08
#define LP3944_REG_REGISTER9  0x09

#define LP3944_DIM0 0
#define LP3944_DIM1 1

/* period in ms */
#define LP3944_PERIOD_MIN 0
#define LP3944_PERIOD_MAX 1600

/* duty cycle is a percentage */
#define LP3944_DUTY_CYCLE_MIN 0
#define LP3944_DUTY_CYCLE_MAX 100

#define ldev_to_led(c)       container_of(c, struct lp3944_led_data, ldev)

/* Saved data */
struct lp3944_led_data {
	u8 id;
	enum lp3944_type type;
	enum lp3944_status status;
	struct led_classdev ldev;
	struct i2c_client *client;
	struct work_struct work;
};

struct lp3944_data {
	struct mutex lock;
	struct i2c_client *client;
	struct lp3944_led_data leds[LP3944_LEDS_MAX];
};

static int lp3944_reg_read(struct i2c_client *client, u8 reg, u8 *value)
{
	int tmp;

	tmp = i2c_smbus_read_byte_data(client, reg);
	if (tmp < 0)
		return tmp;

	*value = tmp;

	return 0;
}

static int lp3944_reg_write(struct i2c_client *client, u8 reg, u8 value)
{
	return i2c_smbus_write_byte_data(client, reg, value);
}

/**
 * Set the period for DIM status
 *
 * @client: the i2c client
 * @dim: either LP3944_DIM0 or LP3944_DIM1
 * @period: period of a blink, that is a on/off cycle, expressed in ms.
 */
static int lp3944_dim_set_period(struct i2c_client *client, u8 dim, u16 period)
{
	u8 psc_reg;
	u8 psc_value;
	int err;

	if (dim == LP3944_DIM0)
		psc_reg = LP3944_REG_PSC0;
	else if (dim == LP3944_DIM1)
		psc_reg = LP3944_REG_PSC1;
	else
		return -EINVAL;

	/* Convert period to Prescaler value */
	if (period > LP3944_PERIOD_MAX)
		return -EINVAL;

	psc_value = (period * 255) / LP3944_PERIOD_MAX;

	err = lp3944_reg_write(client, psc_reg, psc_value);

	return err;
}

/**
 * Set the duty cycle for DIM status
 *
 * @client: the i2c client
 * @dim: either LP3944_DIM0 or LP3944_DIM1
 * @duty_cycle: percentage of a period during which a led is ON
 */
static int lp3944_dim_set_dutycycle(struct i2c_client *client, u8 dim,
				    u8 duty_cycle)
{
	u8 pwm_reg;
	u8 pwm_value;
	int err;

	if (dim == LP3944_DIM0)
		pwm_reg = LP3944_REG_PWM0;
	else if (dim == LP3944_DIM1)
		pwm_reg = LP3944_REG_PWM1;
	else
		return -EINVAL;

	/* Convert duty cycle to PWM value */
	if (duty_cycle > LP3944_DUTY_CYCLE_MAX)
		return -EINVAL;

	pwm_value = (duty_cycle * 255) / LP3944_DUTY_CYCLE_MAX;

	err = lp3944_reg_write(client, pwm_reg, pwm_value);

	return err;
}

/**
 * Set the led status
 *
 * @led: a lp3944_led_data structure
 * @status: one of LP3944_LED_STATUS_OFF
 *                 LP3944_LED_STATUS_ON
 *                 LP3944_LED_STATUS_DIM0
 *                 LP3944_LED_STATUS_DIM1
 */
static int lp3944_led_set(struct lp3944_led_data *led, u8 status)
{
	struct lp3944_data *data = i2c_get_clientdata(led->client);
	u8 id = led->id;
	u8 reg;
	u8 val = 0;
	int err;

	dev_dbg(&led->client->dev, "%s: %s, status before normalization:%d\n",
		__func__, led->ldev.name, status);

	switch (id) {
	case LP3944_LED0:
	case LP3944_LED1:
	case LP3944_LED2:
	case LP3944_LED3:
		reg = LP3944_REG_LS0;
		break;
	case LP3944_LED4:
	case LP3944_LED5:
	case LP3944_LED6:
	case LP3944_LED7:
		id -= LP3944_LED4;
		reg = LP3944_REG_LS1;
		break;
	default:
		return -EINVAL;
	}

	if (status > LP3944_LED_STATUS_DIM1)
		return -EINVAL;

	/* invert only 0 and 1, leave unchanged the other values,
	 * remember we are abusing status to set blink patterns
	 */
	if (led->type == LP3944_LED_TYPE_LED_INVERTED && status < 2)
		status = 1 - status;

	mutex_lock(&data->lock);
	lp3944_reg_read(led->client, reg, &val);

	val &= ~(LP3944_LED_STATUS_MASK << (id << 1));
	val |= (status << (id << 1));

	dev_dbg(&led->client->dev, "%s: %s, reg:%d id:%d status:%d val:%#x\n",
		__func__, led->ldev.name, reg, id, status, val);

	/* set led status */
	err = lp3944_reg_write(led->client, reg, val);
	mutex_unlock(&data->lock);

	return err;
}

static int lp3944_led_set_blink(struct led_classdev *led_cdev,
				unsigned long *delay_on,
				unsigned long *delay_off)
{
	struct lp3944_led_data *led = ldev_to_led(led_cdev);
	u16 period;
	u8 duty_cycle;
	int err;

	/* units are in ms */
	if (*delay_on + *delay_off > LP3944_PERIOD_MAX)
		return -EINVAL;

	if (*delay_on == 0 && *delay_off == 0) {
		/* Special case: the leds subsystem requires a default user
		 * friendly blink pattern for the LED.  Let's blink the led
		 * slowly (1Hz).
		 */
		*delay_on = 500;
		*delay_off = 500;
	}

	period = (*delay_on) + (*delay_off);

	/* duty_cycle is the percentage of period during which the led is ON */
	duty_cycle = 100 * (*delay_on) / period;

	/* invert duty cycle for inverted leds, this has the same effect of
	 * swapping delay_on and delay_off
	 */
	if (led->type == LP3944_LED_TYPE_LED_INVERTED)
		duty_cycle = 100 - duty_cycle;

	/* NOTE: using always the first DIM mode, this means that all leds
	 * will have the same blinking pattern.
	 *
	 * We could find a way later to have two leds blinking in hardware
	 * with different patterns at the same time, falling back to software
	 * control for the other ones.
	 */
	err = lp3944_dim_set_period(led->client, LP3944_DIM0, period);
	if (err)
		return err;

	err = lp3944_dim_set_dutycycle(led->client, LP3944_DIM0, duty_cycle);
	if (err)
		return err;

	dev_dbg(&led->client->dev, "%s: OK hardware accelerated blink!\n",
		__func__);

	led->status = LP3944_LED_STATUS_DIM0;
	schedule_work(&led->work);

	return 0;
}

static void lp3944_led_set_brightness(struct led_classdev *led_cdev,
				      enum led_brightness brightness)
{
	struct lp3944_led_data *led = ldev_to_led(led_cdev);

	dev_dbg(&led->client->dev, "%s: %s, %d\n",
		__func__, led_cdev->name, brightness);

	led->status = brightness;
	schedule_work(&led->work);
}

static void lp3944_led_work(struct work_struct *work)
{
	struct lp3944_led_data *led;

	led = container_of(work, struct lp3944_led_data, work);
	lp3944_led_set(led, led->status);
}

static int lp3944_configure(struct i2c_client *client,
			    struct lp3944_data *data,
			    struct lp3944_platform_data *pdata)
{
	int i, err = 0;

	for (i = 0; i < pdata->leds_size; i++) {
		struct lp3944_led *pled = &pdata->leds[i];
		struct lp3944_led_data *led = &data->leds[i];
		led->client = client;
		led->id = i;

		switch (pled->type) {

		case LP3944_LED_TYPE_LED:
		case LP3944_LED_TYPE_LED_INVERTED:
			led->type = pled->type;
			led->status = pled->status;
			led->ldev.name = pled->name;
			led->ldev.max_brightness = 1;
			led->ldev.brightness_set = lp3944_led_set_brightness;
			led->ldev.blink_set = lp3944_led_set_blink;
			led->ldev.flags = LED_CORE_SUSPENDRESUME;

			INIT_WORK(&led->work, lp3944_led_work);
			err = led_classdev_register(&client->dev, &led->ldev);
			if (err < 0) {
				dev_err(&client->dev,
					"couldn't register LED %s\n",
					led->ldev.name);
				goto exit;
			}

			/* to expose the default value to userspace */
			led->ldev.brightness = led->status;

			/* Set the default led status */
			err = lp3944_led_set(led, led->status);
			if (err < 0) {
				dev_err(&client->dev,
					"%s couldn't set STATUS %d\n",
					led->ldev.name, led->status);
				goto exit;
			}
			break;

		case LP3944_LED_TYPE_NONE:
		default:
			break;

		}
	}
	return 0;

exit:
	if (i > 0)
		for (i = i - 1; i >= 0; i--)
			switch (pdata->leds[i].type) {

			case LP3944_LED_TYPE_LED:
			case LP3944_LED_TYPE_LED_INVERTED:
				led_classdev_unregister(&data->leds[i].ldev);
				cancel_work_sync(&data->leds[i].work);
				break;

			case LP3944_LED_TYPE_NONE:
			default:
				break;
			}

	return err;
}

static int lp3944_probe(struct i2c_client *client,
				  const struct i2c_device_id *id)
{
	struct lp3944_platform_data *lp3944_pdata = client->dev.platform_data;
	struct lp3944_data *data;
	int err;

	if (lp3944_pdata == NULL) {
		dev_err(&client->dev, "no platform data\n");
		return -EINVAL;
	}

	/* Let's see whether this adapter can support what we need. */
	if (!i2c_check_functionality(client->adapter,
				I2C_FUNC_SMBUS_BYTE_DATA)) {
		dev_err(&client->dev, "insufficient functionality!\n");
		return -ENODEV;
	}

	data = devm_kzalloc(&client->dev, sizeof(struct lp3944_data),
			GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->client = client;
	i2c_set_clientdata(client, data);

	mutex_init(&data->lock);

	err = lp3944_configure(client, data, lp3944_pdata);
	if (err < 0)
		return err;

	dev_info(&client->dev, "lp3944 enabled\n");
	return 0;
}

static int lp3944_remove(struct i2c_client *client)
{
	struct lp3944_platform_data *pdata = client->dev.platform_data;
	struct lp3944_data *data = i2c_get_clientdata(client);
	int i;

	for (i = 0; i < pdata->leds_size; i++)
		switch (data->leds[i].type) {
		case LP3944_LED_TYPE_LED:
		case LP3944_LED_TYPE_LED_INVERTED:
			led_classdev_unregister(&data->leds[i].ldev);
			cancel_work_sync(&data->leds[i].work);
			break;

		case LP3944_LED_TYPE_NONE:
		default:
			break;
		}

	return 0;
}

/* lp3944 i2c driver struct */
static const struct i2c_device_id lp3944_id[] = {
	{"lp3944", 0},
	{}
};

MODULE_DEVICE_TABLE(i2c, lp3944_id);

static struct i2c_driver lp3944_driver = {
	.driver   = {
		   .name = "lp3944",
	},
	.probe    = lp3944_probe,
	.remove   = lp3944_remove,
	.id_table = lp3944_id,
};

module_i2c_driver(lp3944_driver);

MODULE_AUTHOR("Antonio Ospite <ospite@studenti.unina.it>");
MODULE_DESCRIPTION("LP3944 Fun Light Chip");
MODULE_LICENSE("GPL");
Commit	Line	Data
5054d39e AO	1	/*
	2	* leds-lp3944.c - driver for National Semiconductor LP3944 Funlight Chip
	3	*
	4	* Copyright (C) 2009 Antonio Ospite <ospite@studenti.unina.it>
	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	/*
	13	* I2C driver for National Semiconductor LP3944 Funlight Chip
	14	* http://www.national.com/pf/LP/LP3944.html
	15	*
	16	* This helper chip can drive up to 8 leds, with two programmable DIM modes;
	17	* it could even be used as a gpio expander but this driver assumes it is used
	18	* as a led controller.
	19	*
	20	* The DIM modes are used to set _blink_ patterns for leds, the pattern is
	21	* specified supplying two parameters:
	22	* - period: from 0s to 1.6s
	23	* - duty cycle: percentage of the period the led is on, from 0 to 100
	24	*
	25	* LP3944 can be found on Motorola A910 smartphone, where it drives the rgb
	26	* leds, the camera flash light and the displays backlights.
	27	*/
	28
	29	#include <linux/module.h>
	30	#include <linux/i2c.h>
5a0e3ad6	31	#include <linux/slab.h>
5054d39e AO	32	#include <linux/leds.h>
	33	#include <linux/mutex.h>
	34	#include <linux/workqueue.h>
	35	#include <linux/leds-lp3944.h>
	36
	37	/* Read Only Registers */
	38	#define LP3944_REG_INPUT1 0x00 /* LEDs 0-7 InputRegister (Read Only) */
	39	#define LP3944_REG_REGISTER1 0x01 /* None (Read Only) */
	40
	41	#define LP3944_REG_PSC0 0x02 /* Frequency Prescaler 0 (R/W) */
	42	#define LP3944_REG_PWM0 0x03 /* PWM Register 0 (R/W) */
	43	#define LP3944_REG_PSC1 0x04 /* Frequency Prescaler 1 (R/W) */
	44	#define LP3944_REG_PWM1 0x05 /* PWM Register 1 (R/W) */
	45	#define LP3944_REG_LS0 0x06 /* LEDs 0-3 Selector (R/W) */
	46	#define LP3944_REG_LS1 0x07 /* LEDs 4-7 Selector (R/W) */
	47
	48	/* These registers are not used to control leds in LP3944, they can store
	49	* arbitrary values which the chip will ignore.
	50	*/
	51	#define LP3944_REG_REGISTER8 0x08
	52	#define LP3944_REG_REGISTER9 0x09
	53
	54	#define LP3944_DIM0 0
	55	#define LP3944_DIM1 1
	56
	57	/* period in ms */
	58	#define LP3944_PERIOD_MIN 0
	59	#define LP3944_PERIOD_MAX 1600
	60
	61	/* duty cycle is a percentage */
	62	#define LP3944_DUTY_CYCLE_MIN 0
	63	#define LP3944_DUTY_CYCLE_MAX 100
	64
	65	#define ldev_to_led(c) container_of(c, struct lp3944_led_data, ldev)
	66
	67	/* Saved data */
	68	struct lp3944_led_data {
	69	u8 id;
	70	enum lp3944_type type;
	71	enum lp3944_status status;
	72	struct led_classdev ldev;
	73	struct i2c_client *client;
	74	struct work_struct work;
	75	};
	76
	77	struct lp3944_data {
	78	struct mutex lock;
	79	struct i2c_client *client;
	80	struct lp3944_led_data leds[LP3944_LEDS_MAX];
	81	};
	82
	83	static int lp3944_reg_read(struct i2c_client client, u8 reg, u8 value)
	84	{
	85	int tmp;
	86
	87	tmp = i2c_smbus_read_byte_data(client, reg);
	88	if (tmp < 0)
4401e487	89	return tmp;
5054d39e AO	90
	91	*value = tmp;
	92
	93	return 0;
	94	}
	95
	96	static int lp3944_reg_write(struct i2c_client *client, u8 reg, u8 value)
	97	{
	98	return i2c_smbus_write_byte_data(client, reg, value);
	99	}
	100
	101	/**
	102	* Set the period for DIM status
	103	*
	104	* @client: the i2c client
	105	* @dim: either LP3944_DIM0 or LP3944_DIM1
	106	* @period: period of a blink, that is a on/off cycle, expressed in ms.
	107	*/
	108	static int lp3944_dim_set_period(struct i2c_client *client, u8 dim, u16 period)
	109	{
	110	u8 psc_reg;
	111	u8 psc_value;
	112	int err;
	113
	114	if (dim == LP3944_DIM0)
	115	psc_reg = LP3944_REG_PSC0;
	116	else if (dim == LP3944_DIM1)
	117	psc_reg = LP3944_REG_PSC1;
	118	else
	119	return -EINVAL;
	120
	121	/* Convert period to Prescaler value */
	122	if (period > LP3944_PERIOD_MAX)
	123	return -EINVAL;
	124
	125	psc_value = (period * 255) / LP3944_PERIOD_MAX;
	126
	127	err = lp3944_reg_write(client, psc_reg, psc_value);
	128
	129	return err;
	130	}
	131
	132	/**
	133	* Set the duty cycle for DIM status
	134	*
	135	* @client: the i2c client
	136	* @dim: either LP3944_DIM0 or LP3944_DIM1
	137	* @duty_cycle: percentage of a period during which a led is ON
	138	*/
	139	static int lp3944_dim_set_dutycycle(struct i2c_client *client, u8 dim,
	140	u8 duty_cycle)
	141	{
	142	u8 pwm_reg;
	143	u8 pwm_value;
	144	int err;
	145
	146	if (dim == LP3944_DIM0)
	147	pwm_reg = LP3944_REG_PWM0;
	148	else if (dim == LP3944_DIM1)
	149	pwm_reg = LP3944_REG_PWM1;
	150	else
	151	return -EINVAL;
	152
	153	/* Convert duty cycle to PWM value */
154	if (duty_cycle > LP3944_DUTY_CYCLE_MAX)
155	return -EINVAL;
156
157	pwm_value = (duty_cycle * 255) / LP3944_DUTY_CYCLE_MAX;
158
159	err = lp3944_reg_write(client, pwm_reg, pwm_value);
160
161	return err;
162	}
163
164	/**
165	* Set the led status
166	*
167	* @led: a lp3944_led_data structure
168	* @status: one of LP3944_LED_STATUS_OFF
169	* LP3944_LED_STATUS_ON
170	* LP3944_LED_STATUS_DIM0
171	* LP3944_LED_STATUS_DIM1
172	*/
173	static int lp3944_led_set(struct lp3944_led_data *led, u8 status)
174	{
175	struct lp3944_data *data = i2c_get_clientdata(led->client);
176	u8 id = led->id;
177	u8 reg;
178	u8 val = 0;
179	int err;
180
181	dev_dbg(&led->client->dev, "%s: %s, status before normalization:%d\n",
182	__func__, led->ldev.name, status);
183
184	switch (id) {
185	case LP3944_LED0:
186	case LP3944_LED1:
187	case LP3944_LED2:
188	case LP3944_LED3:
189	reg = LP3944_REG_LS0;
190	break;
191	case LP3944_LED4:
192	case LP3944_LED5:
193	case LP3944_LED6:
194	case LP3944_LED7:
195	id -= LP3944_LED4;
196	reg = LP3944_REG_LS1;
197	break;
198	default:
199	return -EINVAL;
200	}
201
202	if (status > LP3944_LED_STATUS_DIM1)
203	return -EINVAL;
204
205	/* invert only 0 and 1, leave unchanged the other values,
206	* remember we are abusing status to set blink patterns
207	*/
208	if (led->type == LP3944_LED_TYPE_LED_INVERTED && status < 2)
209	status = 1 - status;
210
211	mutex_lock(&data->lock);
212	lp3944_reg_read(led->client, reg, &val);
213
214	val &= ~(LP3944_LED_STATUS_MASK << (id << 1));
215	val \|= (status << (id << 1));
216
217	dev_dbg(&led->client->dev, "%s: %s, reg:%d id:%d status:%d val:%#x\n",
218	__func__, led->ldev.name, reg, id, status, val);
219
220	/* set led status */
221	err = lp3944_reg_write(led->client, reg, val);
222	mutex_unlock(&data->lock);
223
224	return err;
225	}
226
227	static int lp3944_led_set_blink(struct led_classdev *led_cdev,
228	unsigned long *delay_on,
229	unsigned long *delay_off)
230	{
231	struct lp3944_led_data *led = ldev_to_led(led_cdev);
232	u16 period;
233	u8 duty_cycle;
234	int err;
235
236	/* units are in ms */
237	if (delay_on + delay_off > LP3944_PERIOD_MAX)
238	return -EINVAL;
239
240	if (delay_on == 0 && delay_off == 0) {
241	/* Special case: the leds subsystem requires a default user
242	* friendly blink pattern for the LED. Let's blink the led
243	* slowly (1Hz).
244	*/
245	*delay_on = 500;
246	*delay_off = 500;
247	}
248
249	period = (delay_on) + (delay_off);
250
251	/* duty_cycle is the percentage of period during which the led is ON */
252	duty_cycle = 100 * (*delay_on) / period;
253
254	/* invert duty cycle for inverted leds, this has the same effect of
255	* swapping delay_on and delay_off
256	*/
257	if (led->type == LP3944_LED_TYPE_LED_INVERTED)
258	duty_cycle = 100 - duty_cycle;
259
260	/* NOTE: using always the first DIM mode, this means that all leds
261	* will have the same blinking pattern.
262	*
263	* We could find a way later to have two leds blinking in hardware
264	* with different patterns at the same time, falling back to software
265	* control for the other ones.
266	*/
267	err = lp3944_dim_set_period(led->client, LP3944_DIM0, period);
268	if (err)
269	return err;
270
271	err = lp3944_dim_set_dutycycle(led->client, LP3944_DIM0, duty_cycle);
272	if (err)
273	return err;
274
275	dev_dbg(&led->client->dev, "%s: OK hardware accelerated blink!\n",
276	__func__);
277
278	led->status = LP3944_LED_STATUS_DIM0;
279	schedule_work(&led->work);
280
281	return 0;
282	}
283
284	static void lp3944_led_set_brightness(struct led_classdev *led_cdev,
285	enum led_brightness brightness)
286	{
287	struct lp3944_led_data *led = ldev_to_led(led_cdev);
288
289	dev_dbg(&led->client->dev, "%s: %s, %d\n",
290	__func__, led_cdev->name, brightness);
291
292	led->status = brightness;
293	schedule_work(&led->work);
294	}
295
296	static void lp3944_led_work(struct work_struct *work)
297	{
298	struct lp3944_led_data *led;
299
300	led = container_of(work, struct lp3944_led_data, work);
301	lp3944_led_set(led, led->status);
302	}
303
304	static int lp3944_configure(struct i2c_client *client,
305	struct lp3944_data *data,
306	struct lp3944_platform_data *pdata)
307	{
308	int i, err = 0;
309
310	for (i = 0; i < pdata->leds_size; i++) {
311	struct lp3944_led *pled = &pdata->leds[i];
312	struct lp3944_led_data *led = &data->leds[i];
313	led->client = client;
314	led->id = i;
315
316	switch (pled->type) {
317
318	case LP3944_LED_TYPE_LED:
319	case LP3944_LED_TYPE_LED_INVERTED:
320	led->type = pled->type;
321	led->status = pled->status;
322	led->ldev.name = pled->name;
323	led->ldev.max_brightness = 1;
324	led->ldev.brightness_set = lp3944_led_set_brightness;
325	led->ldev.blink_set = lp3944_led_set_blink;
326	led->ldev.flags = LED_CORE_SUSPENDRESUME;
327
328	INIT_WORK(&led->work, lp3944_led_work);
329	err = led_classdev_register(&client->dev, &led->ldev);
330	if (err < 0) {
331	dev_err(&client->dev,
332	"couldn't register LED %s\n",
333	led->ldev.name);
334	goto exit;
335	}
336
337	/* to expose the default value to userspace */
338	led->ldev.brightness = led->status;
339
340	/* Set the default led status */
341	err = lp3944_led_set(led, led->status);
342	if (err < 0) {
343	dev_err(&client->dev,
344	"%s couldn't set STATUS %d\n",
345	led->ldev.name, led->status);
346	goto exit;
347	}
348	break;
349
350	case LP3944_LED_TYPE_NONE:
351	default:
352	break;
353
354	}
355	}
356	return 0;
357
358	exit:
359	if (i > 0)
360	for (i = i - 1; i >= 0; i--)
361	switch (pdata->leds[i].type) {
362
363	case LP3944_LED_TYPE_LED:
364	case LP3944_LED_TYPE_LED_INVERTED:
365	led_classdev_unregister(&data->leds[i].ldev);
366	cancel_work_sync(&data->leds[i].work);
367	break;
368
369	case LP3944_LED_TYPE_NONE:
370	default:
371	break;
372	}
373
374	return err;
375	}
376
98ea1ea2	377	static int lp3944_probe(struct i2c_client *client,
5054d39e AO	378	const struct i2c_device_id *id)
	379	{
	380	struct lp3944_platform_data *lp3944_pdata = client->dev.platform_data;
	381	struct lp3944_data *data;
7e1ce34f	382	int err;
5054d39e AO	383
	384	if (lp3944_pdata == NULL) {
	385	dev_err(&client->dev, "no platform data\n");
	386	return -EINVAL;
	387	}
	388
	389	/* Let's see whether this adapter can support what we need. */
	390	if (!i2c_check_functionality(client->adapter,
	391	I2C_FUNC_SMBUS_BYTE_DATA)) {
	392	dev_err(&client->dev, "insufficient functionality!\n");
	393	return -ENODEV;
	394	}
	395
9813d74f BW	396	data = devm_kzalloc(&client->dev, sizeof(struct lp3944_data),
9813d74f BW	397	GFP_KERNEL);
5054d39e AO	398	if (!data)
	399	return -ENOMEM;
	400
	401	data->client = client;
	402	i2c_set_clientdata(client, data);
	403
	404	mutex_init(&data->lock);
	405
7e1ce34f	406	err = lp3944_configure(client, data, lp3944_pdata);
9813d74f	407	if (err < 0)
7e1ce34f	408	return err;
5054d39e	409
7e1ce34f	410	dev_info(&client->dev, "lp3944 enabled\n");
5054d39e AO	411	return 0;
	412	}
	413
678e8a6b	414	static int lp3944_remove(struct i2c_client *client)
5054d39e AO	415	{
	416	struct lp3944_platform_data *pdata = client->dev.platform_data;
	417	struct lp3944_data *data = i2c_get_clientdata(client);
	418	int i;
	419
	420	for (i = 0; i < pdata->leds_size; i++)
	421	switch (data->leds[i].type) {
	422	case LP3944_LED_TYPE_LED:
	423	case LP3944_LED_TYPE_LED_INVERTED:
	424	led_classdev_unregister(&data->leds[i].ldev);
	425	cancel_work_sync(&data->leds[i].work);
	426	break;
	427
	428	case LP3944_LED_TYPE_NONE:
	429	default:
	430	break;
	431	}
	432
5054d39e AO	433	return 0;
	434	}
	435
	436	/* lp3944 i2c driver struct */
	437	static const struct i2c_device_id lp3944_id[] = {
	438	{"lp3944", 0},
	439	{}
	440	};
	441
	442	MODULE_DEVICE_TABLE(i2c, lp3944_id);
	443
	444	static struct i2c_driver lp3944_driver = {
	445	.driver = {
	446	.name = "lp3944",
	447	},
	448	.probe = lp3944_probe,
df07cf81	449	.remove = lp3944_remove,
5054d39e AO	450	.id_table = lp3944_id,
	451	};
	452
09a0d183	453	module_i2c_driver(lp3944_driver);
5054d39e AO	454
	455	MODULE_AUTHOR("Antonio Ospite <ospite@studenti.unina.it>");
	456	MODULE_DESCRIPTION("LP3944 Fun Light Chip");
	457	MODULE_LICENSE("GPL");