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linux/drivers/leds/leds-lm3556.c
G.Shark Jeong 32abb4788d leds: Add LED driver for lm3556 chip 
LM3556 :
The LM3556 is a 4 MHz fixed-frequency synchronous boost
converter plus 1.5A constant current driver for a high-current white LED.
Datasheet: www.national.com/ds/LM/LM3556.pdf

Tested on OMAP4430

(bryan.wu@canonical.com: use module_i2c_driver() rather than
lm3556_init/lm3556_exit for code simplicity; fixed some typo
pointed out by Rob Landley)

Signed-off-by: G.Shark Jeong <gshark.jeong@gmail.com>
Reviewed-by: Axel Lin <axel.lin@gmail.com>
Reviewed-by: Kim, Milo <Milo.Kim@ti.com>
Acked-by: Rob Landley <rob@landley.net>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>
2012-07-24 07:52:35 +08:00

513 lines
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/*
* Simple driver for Texas Instruments LM3556 LED Flash driver chip (Rev0x03)
* 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.
*
* Please refer Documentation/leds/leds-lm3556.txt file.
*/
#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/platform_data/leds-lm3556.h>
#define REG_FILT_TIME (0x0)
#define REG_IVFM_MODE (0x1)
#define REG_NTC (0x2)
#define REG_INDIC_TIME (0x3)
#define REG_INDIC_BLINK (0x4)
#define REG_INDIC_PERIOD (0x5)
#define REG_TORCH_TIME (0x6)
#define REG_CONF (0x7)
#define REG_FLASH (0x8)
#define REG_I_CTRL (0x9)
#define REG_ENABLE (0xA)
#define REG_FLAG (0xB)
#define REG_MAX (0xB)
#define IVFM_FILTER_TIME_SHIFT (3)
#define UVLO_EN_SHIFT (7)
#define HYSTERSIS_SHIFT (5)
#define IVM_D_TH_SHIFT (2)
#define IVFM_ADJ_MODE_SHIFT (0)
#define NTC_EVENT_LVL_SHIFT (5)
#define NTC_TRIP_TH_SHIFT (2)
#define NTC_BIAS_I_LVL_SHIFT (0)
#define INDIC_RAMP_UP_TIME_SHIFT (3)
#define INDIC_RAMP_DN_TIME_SHIFT (0)
#define INDIC_N_BLANK_SHIFT (4)
#define INDIC_PULSE_TIME_SHIFT (0)
#define INDIC_N_PERIOD_SHIFT (0)
#define TORCH_RAMP_UP_TIME_SHIFT (3)
#define TORCH_RAMP_DN_TIME_SHIFT (0)
#define STROBE_USUAGE_SHIFT (7)
#define STROBE_PIN_POLARITY_SHIFT (6)
#define TORCH_PIN_POLARITY_SHIFT (5)
#define TX_PIN_POLARITY_SHIFT (4)
#define TX_EVENT_LVL_SHIFT (3)
#define IVFM_EN_SHIFT (2)
#define NTC_MODE_SHIFT (1)
#define INDIC_MODE_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 NTC_EN_SHIFT (7)
#define TX_PIN_EN_SHIFT (6)
#define STROBE_PIN_EN_SHIFT (5)
#define TORCH_PIN_EN_SHIFT (4)
#define PRECHG_MODE_EN_SHIFT (3)
#define PASS_MODE_ONLY_EN_SHIFT (2)
#define MODE_BITS_SHIFT (0)
#define IVFM_FILTER_TIME_MASK (0x3)
#define UVLO_EN_MASK (0x1)
#define HYSTERSIS_MASK (0x3)
#define IVM_D_TH_MASK (0x7)
#define IVFM_ADJ_MODE_MASK (0x3)
#define NTC_EVENT_LVL_MASK (0x1)
#define NTC_TRIP_TH_MASK (0x7)
#define NTC_BIAS_I_LVL_MASK (0x3)
#define INDIC_RAMP_UP_TIME_MASK (0x7)
#define INDIC_RAMP_DN_TIME_MASK (0x7)
#define INDIC_N_BLANK_MASK (0x7)
#define INDIC_PULSE_TIME_MASK (0x7)
#define INDIC_N_PERIOD_MASK (0x7)
#define TORCH_RAMP_UP_TIME_MASK (0x7)
#define TORCH_RAMP_DN_TIME_MASK (0x7)
#define STROBE_USUAGE_MASK (0x1)
#define STROBE_PIN_POLARITY_MASK (0x1)
#define TORCH_PIN_POLARITY_MASK (0x1)
#define TX_PIN_POLARITY_MASK (0x1)
#define TX_EVENT_LVL_MASK (0x1)
#define IVFM_EN_MASK (0x1)
#define NTC_MODE_MASK (0x1)
#define INDIC_MODE_MASK (0x1)
#define INDUCTOR_I_LIMIT_MASK (0x3)
#define FLASH_RAMP_TIME_MASK (0x7)
#define FLASH_TOUT_TIME_MASK (0x7)
#define TORCH_I_MASK (0x7)
#define FLASH_I_MASK (0xF)
#define NTC_EN_MASK (0x1)
#define TX_PIN_EN_MASK (0x1)
#define STROBE_PIN_EN_MASK (0x1)
#define TORCH_PIN_EN_MASK (0x1)
#define PRECHG_MODE_EN_MASK (0x1)
#define PASS_MODE_ONLY_EN_MASK (0x1)
#define MODE_BITS_MASK (0x13)
#define EX_PIN_CONTROL_MASK (0xF1)
#define EX_PIN_ENABLE_MASK (0x70)
enum lm3556_indic_pulse_time {
PULSE_TIME_0_MS = 0,
PULSE_TIME_32_MS,
PULSE_TIME_64_MS,
PULSE_TIME_92_MS,
PULSE_TIME_128_MS,
PULSE_TIME_160_MS,
PULSE_TIME_196_MS,
PULSE_TIME_224_MS,
PULSE_TIME_256_MS,
PULSE_TIME_288_MS,
PULSE_TIME_320_MS,
PULSE_TIME_352_MS,
PULSE_TIME_384_MS,
PULSE_TIME_416_MS,
PULSE_TIME_448_MS,
PULSE_TIME_480_MS,
};
enum lm3556_indic_n_blank {
INDIC_N_BLANK_0 = 0,
INDIC_N_BLANK_1,
INDIC_N_BLANK_2,
INDIC_N_BLANK_3,
INDIC_N_BLANK_4,
INDIC_N_BLANK_5,
INDIC_N_BLANK_6,
INDIC_N_BLANK_7,
INDIC_N_BLANK_8,
INDIC_N_BLANK_9,
INDIC_N_BLANK_10,
INDIC_N_BLANK_11,
INDIC_N_BLANK_12,
INDIC_N_BLANK_13,
INDIC_N_BLANK_14,
INDIC_N_BLANK_15,
};
enum lm3556_indic_period {
INDIC_PERIOD_0 = 0,
INDIC_PERIOD_1,
INDIC_PERIOD_2,
INDIC_PERIOD_3,
INDIC_PERIOD_4,
INDIC_PERIOD_5,
INDIC_PERIOD_6,
INDIC_PERIOD_7,
};
enum lm3556_mode {
MODES_STASNDBY = 0,
MODES_INDIC,
MODES_TORCH,
MODES_FLASH
};
#define INDIC_PATTERN_SIZE 4
struct indicator {
u8 blinking;
u8 period_cnt;
};
struct lm3556_chip_data {
struct device *dev;
struct led_classdev cdev_flash;
struct led_classdev cdev_torch;
struct led_classdev cdev_indicator;
struct lm3556_platform_data *pdata;
struct regmap *regmap;
struct mutex lock;
unsigned int last_flag;
};
/* indicator pattern */
static struct indicator indicator_pattern[INDIC_PATTERN_SIZE] = {
[0] = {(INDIC_N_BLANK_1 << INDIC_N_BLANK_SHIFT)
| PULSE_TIME_32_MS, INDIC_PERIOD_1},
[1] = {(INDIC_N_BLANK_15 << INDIC_N_BLANK_SHIFT)
| PULSE_TIME_32_MS, INDIC_PERIOD_2},
[2] = {(INDIC_N_BLANK_10 << INDIC_N_BLANK_SHIFT)
| PULSE_TIME_32_MS, INDIC_PERIOD_4},
[3] = {(INDIC_N_BLANK_5 << INDIC_N_BLANK_SHIFT)
| PULSE_TIME_32_MS, INDIC_PERIOD_7},
};
/* chip initialize */
static int __devinit lm3556_chip_init(struct lm3556_chip_data *chip)
{
unsigned int reg_val;
int ret;
struct lm3556_platform_data *pdata = chip->pdata;
/* set config register */
ret = regmap_read(chip->regmap, REG_CONF, &reg_val);
if (ret < 0) {
dev_err(chip->dev, "Failed to read REG_CONF Register\n");
goto out;
}
reg_val &= (~EX_PIN_CONTROL_MASK);
reg_val |= ((pdata->torch_pin_polarity & 0x01)
<< TORCH_PIN_POLARITY_SHIFT);
reg_val |= ((pdata->strobe_usuage & 0x01) << STROBE_USUAGE_SHIFT);
reg_val |= ((pdata->strobe_pin_polarity & 0x01)
<< STROBE_PIN_POLARITY_SHIFT);
reg_val |= ((pdata->tx_pin_polarity & 0x01) << TX_PIN_POLARITY_SHIFT);
reg_val |= ((pdata->indicator_mode & 0x01) << INDIC_MODE_SHIFT);
ret = regmap_write(chip->regmap, REG_CONF, reg_val);
if (ret < 0) {
dev_err(chip->dev, "Failed to write REG_CONF Regisgter\n");
goto out;
}
/* set enable register */
ret = regmap_read(chip->regmap, REG_ENABLE, &reg_val);
if (ret < 0) {
dev_err(chip->dev, "Failed to read REG_ENABLE Register\n");
goto out;
}
reg_val &= (~EX_PIN_ENABLE_MASK);
reg_val |= ((pdata->torch_pin_en & 0x01) << TORCH_PIN_EN_SHIFT);
reg_val |= ((pdata->strobe_pin_en & 0x01) << STROBE_PIN_EN_SHIFT);
reg_val |= ((pdata->tx_pin_en & 0x01) << TX_PIN_EN_SHIFT);
ret = regmap_write(chip->regmap, REG_ENABLE, reg_val);
if (ret < 0) {
dev_err(chip->dev, "Failed to write REG_ENABLE Regisgter\n");
goto out;
}
out:
return ret;
}
/* chip control */
static int lm3556_control(struct lm3556_chip_data *chip,
u8 brightness, enum lm3556_mode opmode)
{
int ret;
struct lm3556_platform_data *pdata = chip->pdata;
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 (pdata->torch_pin_en)
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);
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:
if (pdata->torch_pin_en)
opmode |= (TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT);
break;
default:
return ret;
}
if (ret < 0) {
dev_err(chip->dev, "Failed to write REG_I_CTRL Register\n");
goto out;
}
ret = regmap_update_bits(chip->regmap, REG_ENABLE,
MODE_BITS_MASK << MODE_BITS_SHIFT,
opmode << MODE_BITS_SHIFT);
out:
return ret;
}
/* torch */
static void lm3556_torch_brightness_set(struct led_classdev *cdev,
enum led_brightness brightness)
{
struct lm3556_chip_data *chip =
container_of(cdev, struct lm3556_chip_data, cdev_torch);
mutex_lock(&chip->lock);
lm3556_control(chip, brightness, MODES_TORCH);
mutex_unlock(&chip->lock);
}
/* flash */
static void lm3556_strobe_brightness_set(struct led_classdev *cdev,
enum led_brightness brightness)
{
struct lm3556_chip_data *chip =
container_of(cdev, struct lm3556_chip_data, cdev_flash);
mutex_lock(&chip->lock);
lm3556_control(chip, brightness, MODES_FLASH);
mutex_unlock(&chip->lock);
}
/* indicator */
static void lm3556_indicator_brightness_set(struct led_classdev *cdev,
enum led_brightness brightness)
{
struct lm3556_chip_data *chip =
container_of(cdev, struct lm3556_chip_data, cdev_indicator);
mutex_lock(&chip->lock);
lm3556_control(chip, brightness, MODES_INDIC);
mutex_unlock(&chip->lock);
}
/* indicator pattern */
static ssize_t lm3556_indicator_pattern_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 lm3556_chip_data *chip =
container_of(led_cdev, struct lm3556_chip_data, cdev_indicator);
unsigned int state;
ret = kstrtouint(buf, 10, &state);
if (ret)
goto out;
if (state > INDIC_PATTERN_SIZE - 1)
state = INDIC_PATTERN_SIZE - 1;
ret = regmap_write(chip->regmap, REG_INDIC_BLINK,
indicator_pattern[state].blinking);
if (ret < 0) {
dev_err(chip->dev, "Failed to write REG_ENABLE Regisgter\n");
goto out;
}
ret = regmap_write(chip->regmap, REG_INDIC_PERIOD,
indicator_pattern[state].period_cnt);
if (ret < 0) {
dev_err(chip->dev, "Failed to write REG_ENABLE Regisgter\n");
goto out;
}
return size;
out:
dev_err(chip->dev, "Indicator pattern doesn't saved\n");
return size;
}
static DEVICE_ATTR(pattern, 0666, NULL, lm3556_indicator_pattern_store);
static const struct regmap_config lm3556_regmap = {
.reg_bits = 8,
.val_bits = 8,
.max_register = REG_MAX,
};
/* module initialize */
static int __devinit lm3556_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct lm3556_platform_data *pdata = client->dev.platform_data;
struct lm3556_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 lm3556_chip_data),
GFP_KERNEL);
if (!chip)
return -ENOMEM;
chip->dev = &client->dev;
chip->pdata = pdata;
chip->regmap = devm_regmap_init_i2c(client, &lm3556_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 = lm3556_chip_init(chip);
if (err < 0)
goto err_out;
/* flash */
chip->cdev_flash.name = "flash";
chip->cdev_flash.max_brightness = 16;
chip->cdev_flash.brightness_set = lm3556_strobe_brightness_set;
err = led_classdev_register((struct device *)
&client->dev, &chip->cdev_flash);
if (err < 0)
goto err_out;
/* torch */
chip->cdev_torch.name = "torch";
chip->cdev_torch.max_brightness = 8;
chip->cdev_torch.brightness_set = lm3556_torch_brightness_set;
err = led_classdev_register((struct device *)
&client->dev, &chip->cdev_torch);
if (err < 0)
goto err_create_torch_file;
/* indicator */
chip->cdev_indicator.name = "indicator";
chip->cdev_indicator.max_brightness = 8;
chip->cdev_indicator.brightness_set = lm3556_indicator_brightness_set;
err = led_classdev_register((struct device *)
&client->dev, &chip->cdev_indicator);
if (err < 0)
goto err_create_indicator_file;
err = device_create_file(chip->cdev_indicator.dev, &dev_attr_pattern);
if (err < 0)
goto err_create_pattern_file;
dev_info(&client->dev, "LM3556 is initialized\n");
return 0;
err_create_pattern_file:
led_classdev_unregister(&chip->cdev_indicator);
err_create_indicator_file:
led_classdev_unregister(&chip->cdev_torch);
err_create_torch_file:
led_classdev_unregister(&chip->cdev_flash);
err_out:
return err;
}
static int __devexit lm3556_remove(struct i2c_client *client)
{
struct lm3556_chip_data *chip = i2c_get_clientdata(client);
device_remove_file(chip->cdev_indicator.dev, &dev_attr_pattern);
led_classdev_unregister(&chip->cdev_indicator);
led_classdev_unregister(&chip->cdev_torch);
led_classdev_unregister(&chip->cdev_flash);
regmap_write(chip->regmap, REG_ENABLE, 0);
return 0;
}
static const struct i2c_device_id lm3556_id[] = {
{LM3556_NAME, 0},
{}
};
MODULE_DEVICE_TABLE(i2c, lm3556_id);
static struct i2c_driver lm3556_i2c_driver = {
.driver = {
.name = LM3556_NAME,
.owner = THIS_MODULE,
.pm = NULL,
},
.probe = lm3556_probe,
.remove = __devexit_p(lm3556_remove),
.id_table = lm3556_id,
};
module_i2c_driver(lm3556_i2c_driver);
MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3556");
MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");
MODULE_LICENSE("GPL v2");
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