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/*
* 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 struct lp55xx_led *cdev_to_lp55xx_led(struct led_classdev *cdev)
{
return container_of(cdev, struct lp55xx_led, cdev);
}
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 struct attribute *lp55xx_led_attributes[] = {
NULL,
};
static struct attribute_group lp55xx_led_attr_group = {
.attrs = lp55xx_led_attributes
};
static void lp55xx_set_brightness(struct led_classdev *cdev,
enum led_brightness brightness)
{
struct lp55xx_led *led = cdev_to_lp55xx_led(cdev);
led->brightness = (u8)brightness;
schedule_work(&led->brightness_work);
}
static int lp55xx_init_led(struct lp55xx_led *led,
struct lp55xx_chip *chip, int chan)
{
struct lp55xx_platform_data *pdata = chip->pdata;
struct lp55xx_device_config *cfg = chip->cfg;
struct device *dev = &chip->cl->dev;
char name[32];
int ret;
int max_channel = cfg->max_channel;
if (chan >= max_channel) {
dev_err(dev, "invalid channel: %d / %d\n", chan, max_channel);
return -EINVAL;
}
if (pdata->led_config[chan].led_current == 0)
return 0;
led->led_current = pdata->led_config[chan].led_current;
led->max_current = pdata->led_config[chan].max_current;
led->chan_nr = pdata->led_config[chan].chan_nr;
if (led->chan_nr >= max_channel) {
dev_err(dev, "Use channel numbers between 0 and %d\n",
max_channel - 1);
return -EINVAL;
}
led->cdev.brightness_set = lp55xx_set_brightness;
if (pdata->led_config[chan].name) {
led->cdev.name = pdata->led_config[chan].name;
} else {
snprintf(name, sizeof(name), "%s:channel%d",
pdata->label ? : chip->cl->name, chan);
led->cdev.name = name;
}
/*
* register led class device for each channel and
* add device attributes
*/
ret = led_classdev_register(dev, &led->cdev);
if (ret) {
dev_err(dev, "led register err: %d\n", ret);
return ret;
}
ret = sysfs_create_group(&led->cdev.dev->kobj, &lp55xx_led_attr_group);
if (ret) {
dev_err(dev, "led sysfs err: %d\n", ret);
led_classdev_unregister(&led->cdev);
return ret;
}
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");
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