[deliverable/linux.git] / drivers / leds / leds-lp55xx-common.c

/*
 * LP5521/LP5523/LP55231 Common Driver
 *
 * Copyright 2012 Texas Instruments
 *
 * Author: Milo(Woogyom) Kim <milo.kim@ti.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.
 *
 * Derived from leds-lp5521.c, leds-lp5523.c
 */

#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/platform_data/leds-lp55xx.h>

#include "leds-lp55xx-common.h"

static void lp55xx_reset_device(struct lp55xx_chip *chip)
{
	struct lp55xx_device_config *cfg = chip->cfg;
	u8 addr = cfg->reset.addr;
	u8 val  = cfg->reset.val;

	/* no error checking here because no ACK from the device after reset */
	lp55xx_write(chip, addr, val);
}

static int lp55xx_detect_device(struct lp55xx_chip *chip)
{
	struct lp55xx_device_config *cfg = chip->cfg;
	u8 addr = cfg->enable.addr;
	u8 val  = cfg->enable.val;
	int ret;

	ret = lp55xx_write(chip, addr, val);
	if (ret)
		return ret;

	usleep_range(1000, 2000);

	ret = lp55xx_read(chip, addr, &val);
	if (ret)
		return ret;

	if (val != cfg->enable.val)
		return -ENODEV;

	return 0;
}

static int lp55xx_post_init_device(struct lp55xx_chip *chip)
{
	struct lp55xx_device_config *cfg = chip->cfg;

	if (!cfg->post_init_device)
		return 0;

	return cfg->post_init_device(chip);
}

static int lp55xx_init_led(struct lp55xx_led *led,
			struct lp55xx_chip *chip, int chan)
{
	return 0;
}

int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val)
{
	return i2c_smbus_write_byte_data(chip->cl, reg, val);
}
EXPORT_SYMBOL_GPL(lp55xx_write);

int lp55xx_read(struct lp55xx_chip *chip, u8 reg, u8 *val)
{
	s32 ret;

	ret = i2c_smbus_read_byte_data(chip->cl, reg);
	if (ret < 0)
		return ret;

	*val = ret;
	return 0;
}
EXPORT_SYMBOL_GPL(lp55xx_read);

int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg, u8 mask, u8 val)
{
	int ret;
	u8 tmp;

	ret = lp55xx_read(chip, reg, &tmp);
	if (ret)
		return ret;

	tmp &= ~mask;
	tmp |= val & mask;

	return lp55xx_write(chip, reg, tmp);
}
EXPORT_SYMBOL_GPL(lp55xx_update_bits);

int lp55xx_init_device(struct lp55xx_chip *chip)
{
	struct lp55xx_platform_data *pdata;
	struct lp55xx_device_config *cfg;
	struct device *dev = &chip->cl->dev;
	int ret = 0;

	WARN_ON(!chip);

	pdata = chip->pdata;
	cfg = chip->cfg;

	if (!pdata || !cfg)
		return -EINVAL;

	if (pdata->setup_resources) {
		ret = pdata->setup_resources();
		if (ret < 0) {
			dev_err(dev, "setup resoure err: %d\n", ret);
			goto err;
		}
	}

	if (pdata->enable) {
		pdata->enable(0);
		usleep_range(1000, 2000); /* Keep enable down at least 1ms */
		pdata->enable(1);
		usleep_range(1000, 2000); /* 500us abs min. */
	}

	lp55xx_reset_device(chip);

	/*
	 * Exact value is not available. 10 - 20ms
	 * appears to be enough for reset.
	 */
	usleep_range(10000, 20000);

	ret = lp55xx_detect_device(chip);
	if (ret) {
		dev_err(dev, "device detection err: %d\n", ret);
		goto err;
	}

	/* chip specific initialization */
	ret = lp55xx_post_init_device(chip);
	if (ret) {
		dev_err(dev, "post init device err: %d\n", ret);
		goto err_post_init;
	}

	return 0;

err_post_init:
	lp55xx_deinit_device(chip);
err:
	return ret;
}
EXPORT_SYMBOL_GPL(lp55xx_init_device);

void lp55xx_deinit_device(struct lp55xx_chip *chip)
{
	struct lp55xx_platform_data *pdata = chip->pdata;

	if (pdata->enable)
		pdata->enable(0);

	if (pdata->release_resources)
		pdata->release_resources();
}
EXPORT_SYMBOL_GPL(lp55xx_deinit_device);

int lp55xx_register_leds(struct lp55xx_led *led, struct lp55xx_chip *chip)
{
	struct lp55xx_platform_data *pdata = chip->pdata;
	struct lp55xx_device_config *cfg = chip->cfg;
	int num_channels = pdata->num_channels;
	struct lp55xx_led *each;
	u8 led_current;
	int ret;
	int i;

	if (!cfg->brightness_work_fn) {
		dev_err(&chip->cl->dev, "empty brightness configuration\n");
		return -EINVAL;
	}

	for (i = 0; i < num_channels; i++) {

		/* do not initialize channels that are not connected */
		if (pdata->led_config[i].led_current == 0)
			continue;

		led_current = pdata->led_config[i].led_current;
		each = led + i;
		ret = lp55xx_init_led(each, chip, i);
		if (ret)
			goto err_init_led;

		INIT_WORK(&each->brightness_work, cfg->brightness_work_fn);

		chip->num_leds++;
		each->chip = chip;

		/* setting led current at each channel */
		if (cfg->set_led_current)
			cfg->set_led_current(each, led_current);
	}

	return 0;

err_init_led:
	for (i = 0; i < chip->num_leds; i++) {
		each = led + i;
		led_classdev_unregister(&each->cdev);
		flush_work(&each->brightness_work);
	}
	return ret;
}
EXPORT_SYMBOL_GPL(lp55xx_register_leds);

MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
MODULE_DESCRIPTION("LP55xx Common Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
c93d08fa MWK	1	/*
	2	* LP5521/LP5523/LP55231 Common Driver
	3	*
	4	* Copyright 2012 Texas Instruments
	5	*
	6	* Author: Milo(Woogyom) Kim <milo.kim@ti.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*
	12	* Derived from leds-lp5521.c, leds-lp5523.c
	13	*/
	14
a85908dd	15	#include <linux/delay.h>
c93d08fa MWK	16	#include <linux/i2c.h>
	17	#include <linux/leds.h>
	18	#include <linux/module.h>
	19	#include <linux/platform_data/leds-lp55xx.h>
	20
	21	#include "leds-lp55xx-common.h"
	22
48068d5d MWK	23	static void lp55xx_reset_device(struct lp55xx_chip *chip)
	24	{
	25	struct lp55xx_device_config *cfg = chip->cfg;
	26	u8 addr = cfg->reset.addr;
	27	u8 val = cfg->reset.val;
	28
	29	/* no error checking here because no ACK from the device after reset */
	30	lp55xx_write(chip, addr, val);
	31	}
	32
e3a700d8 MWK	33	static int lp55xx_detect_device(struct lp55xx_chip *chip)
	34	{
	35	struct lp55xx_device_config *cfg = chip->cfg;
	36	u8 addr = cfg->enable.addr;
	37	u8 val = cfg->enable.val;
	38	int ret;
	39
	40	ret = lp55xx_write(chip, addr, val);
	41	if (ret)
	42	return ret;
	43
	44	usleep_range(1000, 2000);
	45
	46	ret = lp55xx_read(chip, addr, &val);
	47	if (ret)
	48	return ret;
	49
	50	if (val != cfg->enable.val)
	51	return -ENODEV;
	52
	53	return 0;
	54	}
	55
ffbdccdb MWK	56	static int lp55xx_post_init_device(struct lp55xx_chip *chip)
	57	{
	58	struct lp55xx_device_config *cfg = chip->cfg;
	59
	60	if (!cfg->post_init_device)
	61	return 0;
	62
	63	return cfg->post_init_device(chip);
	64	}
	65
9e9b3db1 MWK	66	static int lp55xx_init_led(struct lp55xx_led *led,
	67	struct lp55xx_chip *chip, int chan)
	68	{
	69	return 0;
	70	}
	71
c93d08fa MWK	72	int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val)
	73	{
	74	return i2c_smbus_write_byte_data(chip->cl, reg, val);
	75	}
	76	EXPORT_SYMBOL_GPL(lp55xx_write);
	77
	78	int lp55xx_read(struct lp55xx_chip chip, u8 reg, u8 val)
	79	{
	80	s32 ret;
	81
	82	ret = i2c_smbus_read_byte_data(chip->cl, reg);
	83	if (ret < 0)
	84	return ret;
	85
	86	*val = ret;
	87	return 0;
	88	}
	89	EXPORT_SYMBOL_GPL(lp55xx_read);
	90
	91	int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg, u8 mask, u8 val)
	92	{
	93	int ret;
	94	u8 tmp;
	95
	96	ret = lp55xx_read(chip, reg, &tmp);
	97	if (ret)
	98	return ret;
	99
	100	tmp &= ~mask;
	101	tmp \|= val & mask;
	102
	103	return lp55xx_write(chip, reg, tmp);
	104	}
	105	EXPORT_SYMBOL_GPL(lp55xx_update_bits);
	106
a85908dd MWK	107	int lp55xx_init_device(struct lp55xx_chip *chip)
	108	{
	109	struct lp55xx_platform_data *pdata;
48068d5d	110	struct lp55xx_device_config *cfg;
a85908dd MWK	111	struct device *dev = &chip->cl->dev;
	112	int ret = 0;
	113
	114	WARN_ON(!chip);
	115
	116	pdata = chip->pdata;
48068d5d	117	cfg = chip->cfg;
a85908dd	118
48068d5d	119	if (!pdata \|\| !cfg)
a85908dd MWK	120	return -EINVAL;
	121
	122	if (pdata->setup_resources) {
	123	ret = pdata->setup_resources();
	124	if (ret < 0) {
	125	dev_err(dev, "setup resoure err: %d\n", ret);
	126	goto err;
	127	}
	128	}
	129
	130	if (pdata->enable) {
	131	pdata->enable(0);
	132	usleep_range(1000, 2000); /* Keep enable down at least 1ms */
	133	pdata->enable(1);
	134	usleep_range(1000, 2000); /* 500us abs min. */
	135	}
	136
48068d5d MWK	137	lp55xx_reset_device(chip);
	138
	139	/*
	140	* Exact value is not available. 10 - 20ms
	141	* appears to be enough for reset.
	142	*/
	143	usleep_range(10000, 20000);
	144
e3a700d8 MWK	145	ret = lp55xx_detect_device(chip);
	146	if (ret) {
	147	dev_err(dev, "device detection err: %d\n", ret);
	148	goto err;
	149	}
	150
ffbdccdb MWK	151	/* chip specific initialization */
ffbdccdb MWK	152	ret = lp55xx_post_init_device(chip);
22ebeb48 MWK	153	if (ret) {
	154	dev_err(dev, "post init device err: %d\n", ret);
	155	goto err_post_init;
	156	}
ffbdccdb MWK	157
	158	return 0;
	159
22ebeb48	160	err_post_init:
6ce61762 MWK	161	lp55xx_deinit_device(chip);
	162	err:
	163	return ret;
	164	}
	165	EXPORT_SYMBOL_GPL(lp55xx_init_device);
	166
	167	void lp55xx_deinit_device(struct lp55xx_chip *chip)
	168	{
	169	struct lp55xx_platform_data *pdata = chip->pdata;
	170
22ebeb48 MWK	171	if (pdata->enable)
22ebeb48 MWK	172	pdata->enable(0);
6ce61762	173
22ebeb48 MWK	174	if (pdata->release_resources)
22ebeb48 MWK	175	pdata->release_resources();
a85908dd	176	}
6ce61762	177	EXPORT_SYMBOL_GPL(lp55xx_deinit_device);
a85908dd	178
9e9b3db1 MWK	179	int lp55xx_register_leds(struct lp55xx_led led, struct lp55xx_chip chip)
	180	{
	181	struct lp55xx_platform_data *pdata = chip->pdata;
	182	struct lp55xx_device_config *cfg = chip->cfg;
	183	int num_channels = pdata->num_channels;
	184	struct lp55xx_led *each;
	185	u8 led_current;
	186	int ret;
	187	int i;
	188
	189	if (!cfg->brightness_work_fn) {
	190	dev_err(&chip->cl->dev, "empty brightness configuration\n");
	191	return -EINVAL;
	192	}
	193
	194	for (i = 0; i < num_channels; i++) {
	195
	196	/* do not initialize channels that are not connected */
	197	if (pdata->led_config[i].led_current == 0)
	198	continue;
	199
	200	led_current = pdata->led_config[i].led_current;
	201	each = led + i;
	202	ret = lp55xx_init_led(each, chip, i);
	203	if (ret)
	204	goto err_init_led;
	205
	206	INIT_WORK(&each->brightness_work, cfg->brightness_work_fn);
	207
	208	chip->num_leds++;
	209	each->chip = chip;
	210
	211	/* setting led current at each channel */
	212	if (cfg->set_led_current)
	213	cfg->set_led_current(each, led_current);
	214	}
	215
	216	return 0;
	217
	218	err_init_led:
	219	for (i = 0; i < chip->num_leds; i++) {
	220	each = led + i;
	221	led_classdev_unregister(&each->cdev);
	222	flush_work(&each->brightness_work);
	223	}
	224	return ret;
	225	}
	226	EXPORT_SYMBOL_GPL(lp55xx_register_leds);
	227
c93d08fa MWK	228	MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
	229	MODULE_DESCRIPTION("LP55xx Common Driver");
	230	MODULE_LICENSE("GPL");