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leds: Add new LED driver for lm3642 chips 

This driver is a general version for LM642 led chip of TI.

LM3642 :
The LM3642 is a 4MHz fixed-frequency synchronous boost
converter plus 1.5A constant current driver for a high-current
white LED.
The LM3642 is controlled via an I2C-compatible interface.

Signed-off-by: G.Shark Jeong <gshark.jeong@gmail.com>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>
This commit is contained in:
G.Shark Jeong 2012-09-12 20:05:50 +08:00 committed by Bryan Wu
parent f162584232
commit 8b7cfbec05
4 changed files with 521 additions and 0 deletions
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11
drivers/leds/Kconfig
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@ -63,6 +63,17 @@ config LEDS_LM3533
hardware-accelerated blinking with maximum on and off periods of 9.8 hardware-accelerated blinking with maximum on and off periods of 9.8
and 77 seconds respectively. and 77 seconds respectively.
config LEDS_LM3642
tristate "LED support for LM3642 Chip"
depends on LEDS_CLASS && I2C
select REGMAP_I2C
help
This option enables support for LEDs connected to LM3642.
The LM3642 is a 4MHz fixed-frequency synchronous boost
converter plus 1.5A constant current driver for a high-current
white LED.
config LEDS_LOCOMO config LEDS_LOCOMO
tristate "LED Support for Locomo device" tristate "LED Support for Locomo device"
depends on LEDS_CLASS depends on LEDS_CLASS

1
drivers/leds/Makefile
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@ -11,6 +11,7 @@ obj-$(CONFIG_LEDS_BD2802) += leds-bd2802.o
obj-$(CONFIG_LEDS_LOCOMO) += leds-locomo.o obj-$(CONFIG_LEDS_LOCOMO) += leds-locomo.o
obj-$(CONFIG_LEDS_LM3530) += leds-lm3530.o obj-$(CONFIG_LEDS_LM3530) += leds-lm3530.o
obj-$(CONFIG_LEDS_LM3533) += leds-lm3533.o obj-$(CONFIG_LEDS_LM3533) += leds-lm3533.o
obj-$(CONFIG_LEDS_LM3642) += leds-lm3642.o
obj-$(CONFIG_LEDS_MIKROTIK_RB532) += leds-rb532.o obj-$(CONFIG_LEDS_MIKROTIK_RB532) += leds-rb532.o
obj-$(CONFIG_LEDS_S3C24XX) += leds-s3c24xx.o obj-$(CONFIG_LEDS_S3C24XX) += leds-s3c24xx.o
obj-$(CONFIG_LEDS_NET48XX) += leds-net48xx.o obj-$(CONFIG_LEDS_NET48XX) += leds-net48xx.o

471
drivers/leds/leds-lm3642.c Normal file
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@ -0,0 +1,471 @@
/*
* Simple driver for Texas Instruments LM3642 LED Flash driver chip
* Copyright (C) 2012 Texas Instruments
*
* 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.
*
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/leds.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/fs.h>
#include <linux/regmap.h>
#include <linux/workqueue.h>
#include <linux/platform_data/leds-lm3642.h>
#define REG_FILT_TIME (0x0)
#define REG_IVFM_MODE (0x1)
#define REG_TORCH_TIME (0x6)
#define REG_FLASH (0x8)
#define REG_I_CTRL (0x9)
#define REG_ENABLE (0xA)
#define REG_FLAG (0xB)
#define REG_MAX (0xB)
#define UVLO_EN_SHIFT (7)
#define IVM_D_TH_SHIFT (2)
#define TORCH_RAMP_UP_TIME_SHIFT (3)
#define TORCH_RAMP_DN_TIME_SHIFT (0)
#define INDUCTOR_I_LIMIT_SHIFT (6)
#define FLASH_RAMP_TIME_SHIFT (3)
#define FLASH_TOUT_TIME_SHIFT (0)
#define TORCH_I_SHIFT (4)
#define FLASH_I_SHIFT (0)
#define IVFM_SHIFT (7)
#define TX_PIN_EN_SHIFT (6)
#define STROBE_PIN_EN_SHIFT (5)
#define TORCH_PIN_EN_SHIFT (4)
#define MODE_BITS_SHIFT (0)
#define UVLO_EN_MASK (0x1)
#define IVM_D_TH_MASK (0x7)
#define TORCH_RAMP_UP_TIME_MASK (0x7)
#define TORCH_RAMP_DN_TIME_MASK (0x7)
#define INDUCTOR_I_LIMIT_MASK (0x1)
#define FLASH_RAMP_TIME_MASK (0x7)
#define FLASH_TOUT_TIME_MASK (0x7)
#define TORCH_I_MASK (0x7)
#define FLASH_I_MASK (0xF)
#define IVFM_MASK (0x1)
#define TX_PIN_EN_MASK (0x1)
#define STROBE_PIN_EN_MASK (0x1)
#define TORCH_PIN_EN_MASK (0x1)
#define MODE_BITS_MASK (0x73)
#define EX_PIN_CONTROL_MASK (0x71)
#define EX_PIN_ENABLE_MASK (0x70)
enum lm3642_mode {
MODES_STASNDBY = 0,
MODES_INDIC,
MODES_TORCH,
MODES_FLASH
};
struct lm3642_chip_data {
struct device *dev;
struct led_classdev cdev_flash;
struct led_classdev cdev_torch;
struct led_classdev cdev_indicator;
struct work_struct work_flash;
struct work_struct work_torch;
struct work_struct work_indicator;
u8 br_flash;
u8 br_torch;
u8 br_indicator;
enum lm3642_torch_pin_enable torch_pin;
enum lm3642_strobe_pin_enable strobe_pin;
enum lm3642_tx_pin_enable tx_pin;
struct lm3642_platform_data *pdata;
struct regmap *regmap;
struct mutex lock;
unsigned int last_flag;
};
/* chip initialize */
static int __devinit lm3642_chip_init(struct lm3642_chip_data *chip)
{
unsigned int reg_val;
int ret;
struct lm3642_platform_data *pdata = chip->pdata;
/* set enable register */
ret = regmap_read(chip->regmap, REG_ENABLE, &reg_val);
if (ret < 0)
goto out;
reg_val &= (~EX_PIN_ENABLE_MASK);
reg_val |= pdata->tx_pin;
ret = regmap_write(chip->regmap, REG_ENABLE, reg_val);
if (ret < 0)
goto out;
out:
dev_err(chip->dev, "Failed to read REG_ENABLE Register\n");
return ret;
}
/* chip control */
static int lm3642_control(struct lm3642_chip_data *chip,
u8 brightness, enum lm3642_mode opmode)
{
int ret;
ret = regmap_read(chip->regmap, REG_FLAG, &chip->last_flag);
if (ret < 0) {
dev_err(chip->dev, "Failed to read REG_FLAG Register\n");
goto out;
}
if (chip->last_flag)
dev_info(chip->dev, "Last FLAG is 0x%x\n", chip->last_flag);
/* brightness 0 means off-state */
if (!brightness)
opmode = MODES_STASNDBY;
switch (opmode) {
case MODES_TORCH:
ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
TORCH_I_MASK << TORCH_I_SHIFT,
(brightness - 1) << TORCH_I_SHIFT);
if (chip->torch_pin)
opmode |= (TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT);
break;
case MODES_FLASH:
ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
FLASH_I_MASK << FLASH_I_SHIFT,
(brightness - 1) << FLASH_I_SHIFT);
if (chip->strobe_pin)
opmode |= (STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT);
break;
case MODES_INDIC:
ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
TORCH_I_MASK << TORCH_I_SHIFT,
(brightness - 1) << TORCH_I_SHIFT);
break;
case MODES_STASNDBY:
break;
default:
return ret;
}
if (ret < 0) {
dev_err(chip->dev, "Failed to write REG_I_CTRL Register\n");
goto out;
}
if (chip->tx_pin)
opmode |= (TX_PIN_EN_MASK << TX_PIN_EN_SHIFT);
ret = regmap_update_bits(chip->regmap, REG_ENABLE,
MODE_BITS_MASK << MODE_BITS_SHIFT,
opmode << MODE_BITS_SHIFT);
out:
return ret;
}
/* torch */
/* torch pin config for lm3642*/
static ssize_t lm3642_torch_pin_store(struct device *dev,
struct device_attribute *devAttr,
const char *buf, size_t size)
{
ssize_t ret;
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct lm3642_chip_data *chip =
container_of(led_cdev, struct lm3642_chip_data, cdev_indicator);
unsigned int state;
ret = kstrtouint(buf, 10, &state);
if (ret)
goto out_strtoint;
if (state != 0)
state = 0x01 << TORCH_PIN_EN_SHIFT;
chip->torch_pin = state;
ret = regmap_update_bits(chip->regmap, REG_ENABLE,
TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT,
state);
if (ret < 0)
goto out;
return size;
out:
dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
return size;
out_strtoint:
dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
return size;
}
static DEVICE_ATTR(torch_pin, 0666, NULL, lm3642_torch_pin_store);
static void lm3642_deferred_torch_brightness_set(struct work_struct *work)
{
struct lm3642_chip_data *chip =
container_of(work, struct lm3642_chip_data, work_torch);
mutex_lock(&chip->lock);
lm3642_control(chip, chip->br_torch, MODES_TORCH);
mutex_unlock(&chip->lock);
}
static void lm3642_torch_brightness_set(struct led_classdev *cdev,
enum led_brightness brightness)
{
struct lm3642_chip_data *chip =
container_of(cdev, struct lm3642_chip_data, cdev_torch);
chip->br_torch = brightness;
schedule_work(&chip->work_torch);
}
/* flash */
/* strobe pin config for lm3642*/
static ssize_t lm3642_strobe_pin_store(struct device *dev,
struct device_attribute *devAttr,
const char *buf, size_t size)
{
ssize_t ret;
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct lm3642_chip_data *chip =
container_of(led_cdev, struct lm3642_chip_data, cdev_indicator);
unsigned int state;
ret = kstrtouint(buf, 10, &state);
if (ret)
goto out_strtoint;
if (state != 0)
state = 0x01 << STROBE_PIN_EN_SHIFT;
chip->strobe_pin = state;
ret = regmap_update_bits(chip->regmap, REG_ENABLE,
STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT,
state);
if (ret < 0)
goto out;
return size;
out:
dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
return size;
out_strtoint:
dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
return size;
}
static DEVICE_ATTR(strobe_pin, 0666, NULL, lm3642_strobe_pin_store);
static void lm3642_deferred_strobe_brightness_set(struct work_struct *work)
{
struct lm3642_chip_data *chip =
container_of(work, struct lm3642_chip_data, work_flash);
mutex_lock(&chip->lock);
lm3642_control(chip, chip->br_flash, MODES_FLASH);
mutex_unlock(&chip->lock);
}
static void lm3642_strobe_brightness_set(struct led_classdev *cdev,
enum led_brightness brightness)
{
struct lm3642_chip_data *chip =
container_of(cdev, struct lm3642_chip_data, cdev_flash);
chip->br_flash = brightness;
schedule_work(&chip->work_flash);
}
/* indicator */
static void lm3642_deferred_indicator_brightness_set(struct work_struct *work)
{
struct lm3642_chip_data *chip =
container_of(work, struct lm3642_chip_data, work_indicator);
mutex_lock(&chip->lock);
lm3642_control(chip, chip->br_indicator, MODES_INDIC);
mutex_unlock(&chip->lock);
}
static void lm3642_indicator_brightness_set(struct led_classdev *cdev,
enum led_brightness brightness)
{
struct lm3642_chip_data *chip =
container_of(cdev, struct lm3642_chip_data, cdev_indicator);
chip->br_indicator = brightness;
schedule_work(&chip->work_indicator);
}
static const struct regmap_config lm3642_regmap = {
.reg_bits = 8,
.val_bits = 8,
.max_register = REG_MAX,
};
static int __devinit lm3642_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct lm3642_platform_data *pdata = client->dev.platform_data;
struct lm3642_chip_data *chip;
int err;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
dev_err(&client->dev, "i2c functionality check fail.\n");
return -EOPNOTSUPP;
}
if (pdata == NULL) {
dev_err(&client->dev, "needs Platform Data.\n");
return -ENODATA;
}
chip = devm_kzalloc(&client->dev,
sizeof(struct lm3642_chip_data), GFP_KERNEL);
if (!chip)
return -ENOMEM;
chip->dev = &client->dev;
chip->pdata = pdata;
chip->tx_pin = pdata->tx_pin;
chip->torch_pin = pdata->torch_pin;
chip->strobe_pin = pdata->strobe_pin;
chip->regmap = devm_regmap_init_i2c(client, &lm3642_regmap);
if (IS_ERR(chip->regmap)) {
err = PTR_ERR(chip->regmap);
dev_err(&client->dev, "Failed to allocate register map: %d\n",
err);
return err;
}
mutex_init(&chip->lock);
i2c_set_clientdata(client, chip);
err = lm3642_chip_init(chip);
if (err < 0)
goto err_out;
/* flash */
INIT_WORK(&chip->work_flash, lm3642_deferred_strobe_brightness_set);
chip->cdev_flash.name = "flash";
chip->cdev_flash.max_brightness = 16;
chip->cdev_flash.brightness_set = lm3642_strobe_brightness_set;
err = led_classdev_register((struct device *)
&client->dev, &chip->cdev_flash);
if (err < 0) {
dev_err(chip->dev, "failed to register flash\n");
goto err_out;
}
err = device_create_file(chip->cdev_flash.dev, &dev_attr_strobe_pin);
if (err < 0) {
dev_err(chip->dev, "failed to create strobe-pin file\n");
goto err_create_flash_pin_file;
}
/* torch */
INIT_WORK(&chip->work_torch, lm3642_deferred_torch_brightness_set);
chip->cdev_torch.name = "torch";
chip->cdev_torch.max_brightness = 8;
chip->cdev_torch.brightness_set = lm3642_torch_brightness_set;
err = led_classdev_register((struct device *)
&client->dev, &chip->cdev_torch);
if (err < 0) {
dev_err(chip->dev, "failed to register torch\n");
goto err_create_torch_file;
}
err = device_create_file(chip->cdev_torch.dev, &dev_attr_torch_pin);
if (err < 0) {
dev_err(chip->dev, "failed to create torch-pin file\n");
goto err_create_torch_pin_file;
}
/* indicator */
INIT_WORK(&chip->work_indicator,
lm3642_deferred_indicator_brightness_set);
chip->cdev_indicator.name = "indicator";
chip->cdev_indicator.max_brightness = 8;
chip->cdev_indicator.brightness_set = lm3642_indicator_brightness_set;
err = led_classdev_register((struct device *)
&client->dev, &chip->cdev_indicator);
if (err < 0) {
dev_err(chip->dev, "failed to register indicator\n");
goto err_create_indicator_file;
}
dev_info(&client->dev, "LM3642 is initialized\n");
return 0;
err_create_indicator_file:
device_remove_file(chip->cdev_torch.dev, &dev_attr_torch_pin);
err_create_torch_pin_file:
led_classdev_unregister(&chip->cdev_torch);
err_create_torch_file:
device_remove_file(chip->cdev_flash.dev, &dev_attr_strobe_pin);
err_create_flash_pin_file:
led_classdev_unregister(&chip->cdev_flash);
err_out:
return err;
}
static int __devexit lm3642_remove(struct i2c_client *client)
{
struct lm3642_chip_data *chip = i2c_get_clientdata(client);
led_classdev_unregister(&chip->cdev_indicator);
flush_work(&chip->work_indicator);
device_remove_file(chip->cdev_torch.dev, &dev_attr_torch_pin);
led_classdev_unregister(&chip->cdev_torch);
flush_work(&chip->work_torch);
device_remove_file(chip->cdev_flash.dev, &dev_attr_strobe_pin);
led_classdev_unregister(&chip->cdev_flash);
flush_work(&chip->work_flash);
regmap_write(chip->regmap, REG_ENABLE, 0);
return 0;
}
static const struct i2c_device_id lm3642_id[] = {
{LM3642_NAME, 0},
{}
};
MODULE_DEVICE_TABLE(i2c, lm3642_id);
static struct i2c_driver lm3642_i2c_driver = {
.driver = {
.name = LM3642_NAME,
.owner = THIS_MODULE,
.pm = NULL,
},
.probe = lm3642_probe,
.remove = __devexit_p(lm3642_remove),
.id_table = lm3642_id,
};
module_i2c_driver(lm3642_i2c_driver);
MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3642");
MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");
MODULE_LICENSE("GPL v2");

38
include/linux/platform_data/leds-lm3642.h Normal file
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@ -0,0 +1,38 @@
/*
* Copyright (C) 2012 Texas Instruments
*
* License Terms: GNU General Public License v2
*
* Simple driver for Texas Instruments LM3642 LED driver chip
*
* Author: G.Shark Jeong <gshark.jeong@gmail.com>
* Daniel Jeong <daniel.jeong@ti.com>
*/
#ifndef __LINUX_LM3642_H
#define __LINUX_LM3642_H
#define LM3642_NAME "leds-lm3642"
enum lm3642_torch_pin_enable {
LM3642_TORCH_PIN_DISABLE = 0x00,
LM3642_TORCH_PIN_ENABLE = 0x10,
};
enum lm3642_strobe_pin_enable {
LM3642_STROBE_PIN_DISABLE = 0x00,
LM3642_STROBE_PIN_ENABLE = 0x20,
};
enum lm3642_tx_pin_enable {
LM3642_TX_PIN_DISABLE = 0x00,
LM3642_TX_PIN_ENABLE = 0x40,
};
struct lm3642_platform_data {
enum lm3642_torch_pin_enable torch_pin;
enum lm3642_strobe_pin_enable strobe_pin;
enum lm3642_tx_pin_enable tx_pin;
};
#endif /* __LINUX_LM3642_H */