[mirror_ubuntu-artful-kernel.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);
}

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);

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
c93d08fa MWK	66	int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val)
	67	{
	68	return i2c_smbus_write_byte_data(chip->cl, reg, val);
	69	}
	70	EXPORT_SYMBOL_GPL(lp55xx_write);
	71
	72	int lp55xx_read(struct lp55xx_chip chip, u8 reg, u8 val)
	73	{
	74	s32 ret;
	75
	76	ret = i2c_smbus_read_byte_data(chip->cl, reg);
	77	if (ret < 0)
	78	return ret;
	79
	80	*val = ret;
	81	return 0;
	82	}
	83	EXPORT_SYMBOL_GPL(lp55xx_read);
	84
	85	int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg, u8 mask, u8 val)
	86	{
	87	int ret;
	88	u8 tmp;
	89
	90	ret = lp55xx_read(chip, reg, &tmp);
	91	if (ret)
	92	return ret;
	93
	94	tmp &= ~mask;
	95	tmp \|= val & mask;
	96
	97	return lp55xx_write(chip, reg, tmp);
	98	}
	99	EXPORT_SYMBOL_GPL(lp55xx_update_bits);
	100
a85908dd MWK	101	int lp55xx_init_device(struct lp55xx_chip *chip)
	102	{
	103	struct lp55xx_platform_data *pdata;
48068d5d	104	struct lp55xx_device_config *cfg;
a85908dd MWK	105	struct device *dev = &chip->cl->dev;
	106	int ret = 0;
	107
	108	WARN_ON(!chip);
	109
	110	pdata = chip->pdata;
48068d5d	111	cfg = chip->cfg;
a85908dd	112
48068d5d	113	if (!pdata \|\| !cfg)
a85908dd MWK	114	return -EINVAL;
	115
	116	if (pdata->setup_resources) {
	117	ret = pdata->setup_resources();
	118	if (ret < 0) {
	119	dev_err(dev, "setup resoure err: %d\n", ret);
	120	goto err;
	121	}
	122	}
	123
	124	if (pdata->enable) {
	125	pdata->enable(0);
	126	usleep_range(1000, 2000); /* Keep enable down at least 1ms */
	127	pdata->enable(1);
	128	usleep_range(1000, 2000); /* 500us abs min. */
	129	}
	130
48068d5d MWK	131	lp55xx_reset_device(chip);
	132
	133	/*
	134	* Exact value is not available. 10 - 20ms
	135	* appears to be enough for reset.
	136	*/
	137	usleep_range(10000, 20000);
	138
e3a700d8 MWK	139	ret = lp55xx_detect_device(chip);
	140	if (ret) {
	141	dev_err(dev, "device detection err: %d\n", ret);
	142	goto err;
	143	}
	144
ffbdccdb MWK	145	/* chip specific initialization */
ffbdccdb MWK	146	ret = lp55xx_post_init_device(chip);
22ebeb48 MWK	147	if (ret) {
	148	dev_err(dev, "post init device err: %d\n", ret);
	149	goto err_post_init;
	150	}
ffbdccdb MWK	151
	152	return 0;
	153
22ebeb48	154	err_post_init:
6ce61762 MWK	155	lp55xx_deinit_device(chip);
	156	err:
	157	return ret;
	158	}
	159	EXPORT_SYMBOL_GPL(lp55xx_init_device);
	160
	161	void lp55xx_deinit_device(struct lp55xx_chip *chip)
	162	{
	163	struct lp55xx_platform_data *pdata = chip->pdata;
	164
22ebeb48 MWK	165	if (pdata->enable)
22ebeb48 MWK	166	pdata->enable(0);
6ce61762	167
22ebeb48 MWK	168	if (pdata->release_resources)
22ebeb48 MWK	169	pdata->release_resources();
a85908dd	170	}
6ce61762	171	EXPORT_SYMBOL_GPL(lp55xx_deinit_device);
a85908dd	172
c93d08fa MWK	173	MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
	174	MODULE_DESCRIPTION("LP55xx Common Driver");
	175	MODULE_LICENSE("GPL");