[linux-2.6-block.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/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;
	struct led_classdev ldev;
	struct i2c_client *client;
};

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__);

	lp3944_led_set(led, LP3944_LED_STATUS_DIM0);

	return 0;
}

static int 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);

	return lp3944_led_set(led, !!brightness);
}

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->ldev.name = pled->name;
			led->ldev.max_brightness = 1;
			led->ldev.brightness_set_blocking =
						lp3944_led_set_brightness;
			led->ldev.blink_set = lp3944_led_set_blink;
			led->ldev.flags = LED_CORE_SUSPENDRESUME;

			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 =
					(enum led_brightness) pled->status;

			/* Set the default led status */
			err = lp3944_led_set(led, pled->status);
			if (err < 0) {
				dev_err(&client->dev,
					"%s couldn't set STATUS %d\n",
					led->ldev.name, pled->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);
				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 =
			dev_get_platdata(&client->dev);
	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 = dev_get_platdata(&client->dev);
	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);
			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>
5054d39e AO	33	#include <linux/mutex.h>
5054d39e AO	34	#include <linux/leds-lp3944.h>
	35
	36	/* Read Only Registers */
	37	#define LP3944_REG_INPUT1 0x00 /* LEDs 0-7 InputRegister (Read Only) */
	38	#define LP3944_REG_REGISTER1 0x01 /* None (Read Only) */
	39
	40	#define LP3944_REG_PSC0 0x02 /* Frequency Prescaler 0 (R/W) */
	41	#define LP3944_REG_PWM0 0x03 /* PWM Register 0 (R/W) */
	42	#define LP3944_REG_PSC1 0x04 /* Frequency Prescaler 1 (R/W) */
	43	#define LP3944_REG_PWM1 0x05 /* PWM Register 1 (R/W) */
	44	#define LP3944_REG_LS0 0x06 /* LEDs 0-3 Selector (R/W) */
	45	#define LP3944_REG_LS1 0x07 /* LEDs 4-7 Selector (R/W) */
	46
	47	/* These registers are not used to control leds in LP3944, they can store
	48	* arbitrary values which the chip will ignore.
	49	*/
	50	#define LP3944_REG_REGISTER8 0x08
	51	#define LP3944_REG_REGISTER9 0x09
	52
	53	#define LP3944_DIM0 0
	54	#define LP3944_DIM1 1
	55
	56	/* period in ms */
	57	#define LP3944_PERIOD_MIN 0
	58	#define LP3944_PERIOD_MAX 1600
	59
	60	/* duty cycle is a percentage */
	61	#define LP3944_DUTY_CYCLE_MIN 0
	62	#define LP3944_DUTY_CYCLE_MAX 100
	63
	64	#define ldev_to_led(c) container_of(c, struct lp3944_led_data, ldev)
	65
	66	/* Saved data */
	67	struct lp3944_led_data {
	68	u8 id;
	69	enum lp3944_type type;
5054d39e AO	70	struct led_classdev ldev;
5054d39e AO	71	struct i2c_client *client;
5054d39e AO	72	};
	73
	74	struct lp3944_data {
	75	struct mutex lock;
	76	struct i2c_client *client;
	77	struct lp3944_led_data leds[LP3944_LEDS_MAX];
	78	};
	79
	80	static int lp3944_reg_read(struct i2c_client client, u8 reg, u8 value)
	81	{
	82	int tmp;
	83
	84	tmp = i2c_smbus_read_byte_data(client, reg);
	85	if (tmp < 0)
4401e487	86	return tmp;
5054d39e AO	87
	88	*value = tmp;
	89
	90	return 0;
	91	}
	92
	93	static int lp3944_reg_write(struct i2c_client *client, u8 reg, u8 value)
	94	{
	95	return i2c_smbus_write_byte_data(client, reg, value);
	96	}
	97
	98	/**
	99	* Set the period for DIM status
	100	*
	101	* @client: the i2c client
	102	* @dim: either LP3944_DIM0 or LP3944_DIM1
	103	* @period: period of a blink, that is a on/off cycle, expressed in ms.
	104	*/
	105	static int lp3944_dim_set_period(struct i2c_client *client, u8 dim, u16 period)
	106	{
	107	u8 psc_reg;
	108	u8 psc_value;
	109	int err;
	110
	111	if (dim == LP3944_DIM0)
	112	psc_reg = LP3944_REG_PSC0;
	113	else if (dim == LP3944_DIM1)
	114	psc_reg = LP3944_REG_PSC1;
	115	else
	116	return -EINVAL;
	117
	118	/* Convert period to Prescaler value */
	119	if (period > LP3944_PERIOD_MAX)
	120	return -EINVAL;
	121
	122	psc_value = (period * 255) / LP3944_PERIOD_MAX;
	123
	124	err = lp3944_reg_write(client, psc_reg, psc_value);
	125
	126	return err;
	127	}
	128
	129	/**
	130	* Set the duty cycle for DIM status
	131	*
	132	* @client: the i2c client
	133	* @dim: either LP3944_DIM0 or LP3944_DIM1
	134	* @duty_cycle: percentage of a period during which a led is ON
	135	*/
	136	static int lp3944_dim_set_dutycycle(struct i2c_client *client, u8 dim,
	137	u8 duty_cycle)
	138	{
	139	u8 pwm_reg;
	140	u8 pwm_value;
	141	int err;
	142
	143	if (dim == LP3944_DIM0)
	144	pwm_reg = LP3944_REG_PWM0;
	145	else if (dim == LP3944_DIM1)
	146	pwm_reg = LP3944_REG_PWM1;
	147	else
	148	return -EINVAL;
	149
	150	/* Convert duty cycle to PWM value */
151	if (duty_cycle > LP3944_DUTY_CYCLE_MAX)
152	return -EINVAL;
153
154	pwm_value = (duty_cycle * 255) / LP3944_DUTY_CYCLE_MAX;
155
156	err = lp3944_reg_write(client, pwm_reg, pwm_value);
157
158	return err;
159	}
160
161	/**
162	* Set the led status
163	*
164	* @led: a lp3944_led_data structure
165	* @status: one of LP3944_LED_STATUS_OFF
166	* LP3944_LED_STATUS_ON
167	* LP3944_LED_STATUS_DIM0
168	* LP3944_LED_STATUS_DIM1
169	*/
170	static int lp3944_led_set(struct lp3944_led_data *led, u8 status)
171	{
172	struct lp3944_data *data = i2c_get_clientdata(led->client);
173	u8 id = led->id;
174	u8 reg;
175	u8 val = 0;
176	int err;
177
178	dev_dbg(&led->client->dev, "%s: %s, status before normalization:%d\n",
179	__func__, led->ldev.name, status);
180
181	switch (id) {
182	case LP3944_LED0:
183	case LP3944_LED1:
184	case LP3944_LED2:
185	case LP3944_LED3:
186	reg = LP3944_REG_LS0;
187	break;
188	case LP3944_LED4:
189	case LP3944_LED5:
190	case LP3944_LED6:
191	case LP3944_LED7:
192	id -= LP3944_LED4;
193	reg = LP3944_REG_LS1;
194	break;
195	default:
196	return -EINVAL;
197	}
198
199	if (status > LP3944_LED_STATUS_DIM1)
200	return -EINVAL;
201
202	/* invert only 0 and 1, leave unchanged the other values,
203	* remember we are abusing status to set blink patterns
204	*/
205	if (led->type == LP3944_LED_TYPE_LED_INVERTED && status < 2)
206	status = 1 - status;
207
208	mutex_lock(&data->lock);
209	lp3944_reg_read(led->client, reg, &val);
210
211	val &= ~(LP3944_LED_STATUS_MASK << (id << 1));
212	val \|= (status << (id << 1));
213
214	dev_dbg(&led->client->dev, "%s: %s, reg:%d id:%d status:%d val:%#x\n",
215	__func__, led->ldev.name, reg, id, status, val);
216
217	/* set led status */
218	err = lp3944_reg_write(led->client, reg, val);
219	mutex_unlock(&data->lock);
220
221	return err;
222	}
223
224	static int lp3944_led_set_blink(struct led_classdev *led_cdev,
225	unsigned long *delay_on,
226	unsigned long *delay_off)
227	{
228	struct lp3944_led_data *led = ldev_to_led(led_cdev);
229	u16 period;
230	u8 duty_cycle;
231	int err;
232
233	/* units are in ms */
234	if (delay_on + delay_off > LP3944_PERIOD_MAX)
235	return -EINVAL;
236
237	if (delay_on == 0 && delay_off == 0) {
238	/* Special case: the leds subsystem requires a default user
239	* friendly blink pattern for the LED. Let's blink the led
240	* slowly (1Hz).
241	*/
242	*delay_on = 500;
243	*delay_off = 500;
244	}
245
246	period = (delay_on) + (delay_off);
247
248	/* duty_cycle is the percentage of period during which the led is ON */
249	duty_cycle = 100 * (*delay_on) / period;
250
251	/* invert duty cycle for inverted leds, this has the same effect of
252	* swapping delay_on and delay_off
253	*/
254	if (led->type == LP3944_LED_TYPE_LED_INVERTED)
255	duty_cycle = 100 - duty_cycle;
256
257	/* NOTE: using always the first DIM mode, this means that all leds
258	* will have the same blinking pattern.
259	*
260	* We could find a way later to have two leds blinking in hardware
261	* with different patterns at the same time, falling back to software
262	* control for the other ones.
263	*/
264	err = lp3944_dim_set_period(led->client, LP3944_DIM0, period);
265	if (err)
266	return err;
267
268	err = lp3944_dim_set_dutycycle(led->client, LP3944_DIM0, duty_cycle);
269	if (err)
270	return err;
271
272	dev_dbg(&led->client->dev, "%s: OK hardware accelerated blink!\n",
273	__func__);
274
525d6a65	275	lp3944_led_set(led, LP3944_LED_STATUS_DIM0);
5054d39e AO	276
	277	return 0;
	278	}
	279
525d6a65	280	static int lp3944_led_set_brightness(struct led_classdev *led_cdev,
5054d39e AO	281	enum led_brightness brightness)
	282	{
	283	struct lp3944_led_data *led = ldev_to_led(led_cdev);
	284
	285	dev_dbg(&led->client->dev, "%s: %s, %d\n",
	286	__func__, led_cdev->name, brightness);
	287
525d6a65	288	return lp3944_led_set(led, !!brightness);
5054d39e AO	289	}
	290
	291	static int lp3944_configure(struct i2c_client *client,
	292	struct lp3944_data *data,
	293	struct lp3944_platform_data *pdata)
	294	{
	295	int i, err = 0;
	296
	297	for (i = 0; i < pdata->leds_size; i++) {
	298	struct lp3944_led *pled = &pdata->leds[i];
	299	struct lp3944_led_data *led = &data->leds[i];
	300	led->client = client;
	301	led->id = i;
	302
	303	switch (pled->type) {
	304
	305	case LP3944_LED_TYPE_LED:
	306	case LP3944_LED_TYPE_LED_INVERTED:
	307	led->type = pled->type;
5054d39e AO	308	led->ldev.name = pled->name;
5054d39e AO	309	led->ldev.max_brightness = 1;
525d6a65 AL	310	led->ldev.brightness_set_blocking =
525d6a65 AL	311	lp3944_led_set_brightness;
5054d39e AO	312	led->ldev.blink_set = lp3944_led_set_blink;
	313	led->ldev.flags = LED_CORE_SUSPENDRESUME;
	314
5054d39e AO	315	err = led_classdev_register(&client->dev, &led->ldev);
	316	if (err < 0) {
	317	dev_err(&client->dev,
	318	"couldn't register LED %s\n",
	319	led->ldev.name);
	320	goto exit;
	321	}
	322
	323	/* to expose the default value to userspace */
7f14e6b9	324	led->ldev.brightness =
525d6a65	325	(enum led_brightness) pled->status;
5054d39e AO	326
5054d39e AO	327	/* Set the default led status */
525d6a65	328	err = lp3944_led_set(led, pled->status);
5054d39e AO	329	if (err < 0) {
	330	dev_err(&client->dev,
	331	"%s couldn't set STATUS %d\n",
525d6a65	332	led->ldev.name, pled->status);
5054d39e AO	333	goto exit;
	334	}
	335	break;
	336
	337	case LP3944_LED_TYPE_NONE:
	338	default:
	339	break;
	340
	341	}
	342	}
	343	return 0;
	344
	345	exit:
	346	if (i > 0)
	347	for (i = i - 1; i >= 0; i--)
	348	switch (pdata->leds[i].type) {
	349
	350	case LP3944_LED_TYPE_LED:
	351	case LP3944_LED_TYPE_LED_INVERTED:
	352	led_classdev_unregister(&data->leds[i].ldev);
5054d39e AO	353	break;
	354
	355	case LP3944_LED_TYPE_NONE:
	356	default:
	357	break;
	358	}
	359
	360	return err;
	361	}
	362
98ea1ea2	363	static int lp3944_probe(struct i2c_client *client,
5054d39e AO	364	const struct i2c_device_id *id)
5054d39e AO	365	{
87aae1ea JH	366	struct lp3944_platform_data *lp3944_pdata =
87aae1ea JH	367	dev_get_platdata(&client->dev);
5054d39e	368	struct lp3944_data *data;
7e1ce34f	369	int err;
5054d39e AO	370
	371	if (lp3944_pdata == NULL) {
	372	dev_err(&client->dev, "no platform data\n");
	373	return -EINVAL;
	374	}
	375
	376	/* Let's see whether this adapter can support what we need. */
	377	if (!i2c_check_functionality(client->adapter,
	378	I2C_FUNC_SMBUS_BYTE_DATA)) {
	379	dev_err(&client->dev, "insufficient functionality!\n");
	380	return -ENODEV;
	381	}
	382
9813d74f BW	383	data = devm_kzalloc(&client->dev, sizeof(struct lp3944_data),
9813d74f BW	384	GFP_KERNEL);
5054d39e AO	385	if (!data)
	386	return -ENOMEM;
	387
	388	data->client = client;
	389	i2c_set_clientdata(client, data);
	390
	391	mutex_init(&data->lock);
	392
7e1ce34f	393	err = lp3944_configure(client, data, lp3944_pdata);
9813d74f	394	if (err < 0)
7e1ce34f	395	return err;
5054d39e	396
7e1ce34f	397	dev_info(&client->dev, "lp3944 enabled\n");
5054d39e AO	398	return 0;
	399	}
	400
678e8a6b	401	static int lp3944_remove(struct i2c_client *client)
5054d39e	402	{
87aae1ea	403	struct lp3944_platform_data *pdata = dev_get_platdata(&client->dev);
5054d39e AO	404	struct lp3944_data *data = i2c_get_clientdata(client);
	405	int i;
	406
	407	for (i = 0; i < pdata->leds_size; i++)
	408	switch (data->leds[i].type) {
	409	case LP3944_LED_TYPE_LED:
	410	case LP3944_LED_TYPE_LED_INVERTED:
	411	led_classdev_unregister(&data->leds[i].ldev);
5054d39e AO	412	break;
	413
	414	case LP3944_LED_TYPE_NONE:
	415	default:
	416	break;
	417	}
	418
5054d39e AO	419	return 0;
	420	}
	421
	422	/* lp3944 i2c driver struct */
	423	static const struct i2c_device_id lp3944_id[] = {
	424	{"lp3944", 0},
	425	{}
	426	};
	427
	428	MODULE_DEVICE_TABLE(i2c, lp3944_id);
	429
	430	static struct i2c_driver lp3944_driver = {
	431	.driver = {
	432	.name = "lp3944",
	433	},
	434	.probe = lp3944_probe,
df07cf81	435	.remove = lp3944_remove,
5054d39e AO	436	.id_table = lp3944_id,
	437	};
	438
09a0d183	439	module_i2c_driver(lp3944_driver);
5054d39e AO	440
	441	MODULE_AUTHOR("Antonio Ospite <ospite@studenti.unina.it>");
	442	MODULE_DESCRIPTION("LP3944 Fun Light Chip");
	443	MODULE_LICENSE("GPL");