diff options
Diffstat (limited to 'drivers/video/backlight/lm3639_bl.c')
| -rw-r--r-- | drivers/video/backlight/lm3639_bl.c | 437 |
1 files changed, 437 insertions, 0 deletions
diff --git a/drivers/video/backlight/lm3639_bl.c b/drivers/video/backlight/lm3639_bl.c new file mode 100644 index 000000000000..c6915c6c3cd1 --- /dev/null +++ b/drivers/video/backlight/lm3639_bl.c @@ -0,0 +1,437 @@ +/* +* Simple driver for Texas Instruments LM3639 Backlight + Flash LED 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/slab.h> +#include <linux/i2c.h> +#include <linux/leds.h> +#include <linux/backlight.h> +#include <linux/err.h> +#include <linux/delay.h> +#include <linux/uaccess.h> +#include <linux/interrupt.h> +#include <linux/regmap.h> +#include <linux/platform_data/lm3639_bl.h> + +#define REG_DEV_ID 0x00 +#define REG_CHECKSUM 0x01 +#define REG_BL_CONF_1 0x02 +#define REG_BL_CONF_2 0x03 +#define REG_BL_CONF_3 0x04 +#define REG_BL_CONF_4 0x05 +#define REG_FL_CONF_1 0x06 +#define REG_FL_CONF_2 0x07 +#define REG_FL_CONF_3 0x08 +#define REG_IO_CTRL 0x09 +#define REG_ENABLE 0x0A +#define REG_FLAG 0x0B +#define REG_MAX REG_FLAG + +struct lm3639_chip_data { + struct device *dev; + struct lm3639_platform_data *pdata; + + struct backlight_device *bled; + struct led_classdev cdev_flash; + struct led_classdev cdev_torch; + struct regmap *regmap; + + unsigned int bled_mode; + unsigned int bled_map; + unsigned int last_flag; +}; + +/* initialize chip */ +static int __devinit lm3639_chip_init(struct lm3639_chip_data *pchip) +{ + int ret; + unsigned int reg_val; + struct lm3639_platform_data *pdata = pchip->pdata; + + /* input pins config. */ + ret = + regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x08, + pdata->pin_pwm); + if (ret < 0) + goto out; + + reg_val = (pdata->pin_pwm & 0x40) | pdata->pin_strobe | pdata->pin_tx; + ret = regmap_update_bits(pchip->regmap, REG_IO_CTRL, 0x7C, reg_val); + if (ret < 0) + goto out; + + /* init brightness */ + ret = regmap_write(pchip->regmap, REG_BL_CONF_4, pdata->init_brt_led); + if (ret < 0) + goto out; + + ret = regmap_write(pchip->regmap, REG_BL_CONF_3, pdata->init_brt_led); + if (ret < 0) + goto out; + + /* output pins config. */ + if (!pdata->init_brt_led) + reg_val = pdata->fled_pins | pdata->bled_pins; + else + reg_val = pdata->fled_pins | pdata->bled_pins | 0x01; + + ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x79, reg_val); + if (ret < 0) + goto out; + + return ret; +out: + dev_err(pchip->dev, "i2c failed to access register\n"); + return ret; +} + +/* update and get brightness */ +static int lm3639_bled_update_status(struct backlight_device *bl) +{ + int ret; + unsigned int reg_val; + struct lm3639_chip_data *pchip = bl_get_data(bl); + struct lm3639_platform_data *pdata = pchip->pdata; + + ret = regmap_read(pchip->regmap, REG_FLAG, ®_val); + if (ret < 0) + goto out; + + if (reg_val != 0) + dev_info(pchip->dev, "last flag is 0x%x\n", reg_val); + + /* pwm control */ + if (pdata->pin_pwm) { + if (pdata->pwm_set_intensity) + pdata->pwm_set_intensity(bl->props.brightness, + pdata->max_brt_led); + else + dev_err(pchip->dev, + "No pwm control func. in plat-data\n"); + return bl->props.brightness; + } + + /* i2c control and set brigtness */ + ret = regmap_write(pchip->regmap, REG_BL_CONF_4, bl->props.brightness); + if (ret < 0) + goto out; + ret = regmap_write(pchip->regmap, REG_BL_CONF_3, bl->props.brightness); + if (ret < 0) + goto out; + + if (!bl->props.brightness) + ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x01, 0x00); + else + ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x01, 0x01); + if (ret < 0) + goto out; + + return bl->props.brightness; +out: + dev_err(pchip->dev, "i2c failed to access registers\n"); + return bl->props.brightness; +} + +static int lm3639_bled_get_brightness(struct backlight_device *bl) +{ + int ret; + unsigned int reg_val; + struct lm3639_chip_data *pchip = bl_get_data(bl); + struct lm3639_platform_data *pdata = pchip->pdata; + + if (pdata->pin_pwm) { + if (pdata->pwm_get_intensity) + bl->props.brightness = pdata->pwm_get_intensity(); + else + dev_err(pchip->dev, + "No pwm control func. in plat-data\n"); + return bl->props.brightness; + } + + ret = regmap_read(pchip->regmap, REG_BL_CONF_1, ®_val); + if (ret < 0) + goto out; + if (reg_val & 0x10) + ret = regmap_read(pchip->regmap, REG_BL_CONF_4, ®_val); + else + ret = regmap_read(pchip->regmap, REG_BL_CONF_3, ®_val); + if (ret < 0) + goto out; + bl->props.brightness = reg_val; + + return bl->props.brightness; +out: + dev_err(pchip->dev, "i2c failed to access register\n"); + return bl->props.brightness; +} + +static const struct backlight_ops lm3639_bled_ops = { + .options = BL_CORE_SUSPENDRESUME, + .update_status = lm3639_bled_update_status, + .get_brightness = lm3639_bled_get_brightness, +}; + +/* backlight mapping mode */ +static ssize_t lm3639_bled_mode_store(struct device *dev, + struct device_attribute *devAttr, + const char *buf, size_t size) +{ + ssize_t ret; + struct lm3639_chip_data *pchip = dev_get_drvdata(dev); + unsigned int state; + + ret = kstrtouint(buf, 10, &state); + if (ret) + goto out_input; + + if (!state) + ret = + regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x10, + 0x00); + else + ret = + regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x10, + 0x10); + + if (ret < 0) + goto out; + + return size; + +out: + dev_err(pchip->dev, "%s:i2c access fail to register\n", __func__); + return size; + +out_input: + dev_err(pchip->dev, "%s:input conversion fail\n", __func__); + return size; + +} + +static DEVICE_ATTR(bled_mode, 0666, NULL, lm3639_bled_mode_store); + +/* torch */ +static void lm3639_torch_brightness_set(struct led_classdev *cdev, + enum led_brightness brightness) +{ + int ret; + unsigned int reg_val; + struct lm3639_chip_data *pchip; + + pchip = container_of(cdev, struct lm3639_chip_data, cdev_torch); + + ret = regmap_read(pchip->regmap, REG_FLAG, ®_val); + if (ret < 0) + goto out; + if (reg_val != 0) + dev_info(pchip->dev, "last flag is 0x%x\n", reg_val); + + /* brightness 0 means off state */ + if (!brightness) { + ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x00); + if (ret < 0) + goto out; + return; + } + + ret = regmap_update_bits(pchip->regmap, + REG_FL_CONF_1, 0x70, (brightness - 1) << 4); + if (ret < 0) + goto out; + ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x02); + if (ret < 0) + goto out; + + return; +out: + dev_err(pchip->dev, "i2c failed to access register\n"); + return; +} + +/* flash */ +static void lm3639_flash_brightness_set(struct led_classdev *cdev, + enum led_brightness brightness) +{ + int ret; + unsigned int reg_val; + struct lm3639_chip_data *pchip; + + pchip = container_of(cdev, struct lm3639_chip_data, cdev_flash); + + ret = regmap_read(pchip->regmap, REG_FLAG, ®_val); + if (ret < 0) + goto out; + if (reg_val != 0) + dev_info(pchip->dev, "last flag is 0x%x\n", reg_val); + + /* torch off before flash control */ + ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x00); + if (ret < 0) + goto out; + + /* brightness 0 means off state */ + if (!brightness) + return; + + ret = regmap_update_bits(pchip->regmap, + REG_FL_CONF_1, 0x0F, brightness - 1); + if (ret < 0) + goto out; + ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x06); + if (ret < 0) + goto out; + + return; +out: + dev_err(pchip->dev, "i2c failed to access register\n"); + return; +} + +static const struct regmap_config lm3639_regmap = { + .reg_bits = 8, + .val_bits = 8, + .max_register = REG_MAX, +}; + +static int __devinit lm3639_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + int ret; + struct lm3639_chip_data *pchip; + struct lm3639_platform_data *pdata = client->dev.platform_data; + struct backlight_properties props; + + 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; + } + + pchip = devm_kzalloc(&client->dev, + sizeof(struct lm3639_chip_data), GFP_KERNEL); + if (!pchip) + return -ENOMEM; + + pchip->pdata = pdata; + pchip->dev = &client->dev; + + pchip->regmap = devm_regmap_init_i2c(client, &lm3639_regmap); + if (IS_ERR(pchip->regmap)) { + ret = PTR_ERR(pchip->regmap); + dev_err(&client->dev, "fail : allocate register map: %d\n", + ret); + return ret; + } + i2c_set_clientdata(client, pchip); + + /* chip initialize */ + ret = lm3639_chip_init(pchip); + if (ret < 0) { + dev_err(&client->dev, "fail : chip init\n"); + goto err_out; + } + + /* backlight */ + props.type = BACKLIGHT_RAW; + props.brightness = pdata->init_brt_led; + props.max_brightness = pdata->max_brt_led; + pchip->bled = + backlight_device_register("lm3639_bled", pchip->dev, pchip, + &lm3639_bled_ops, &props); + if (IS_ERR(pchip->bled)) { + dev_err(&client->dev, "fail : backlight register\n"); + ret = -EIO; + goto err_out; + } + + ret = device_create_file(&(pchip->bled->dev), &dev_attr_bled_mode); + if (ret < 0) { + dev_err(&client->dev, "failed : add sysfs entries\n"); + ret = -EIO; + goto err_bled_mode; + } + + /* flash */ + pchip->cdev_flash.name = "lm3639_flash"; + pchip->cdev_flash.max_brightness = 16; + pchip->cdev_flash.brightness_set = lm3639_flash_brightness_set; + ret = led_classdev_register((struct device *) + &client->dev, &pchip->cdev_flash); + if (ret < 0) { + dev_err(&client->dev, "fail : flash register\n"); + ret = -EIO; + goto err_flash; + } + + /* torch */ + pchip->cdev_torch.name = "lm3639_torch"; + pchip->cdev_torch.max_brightness = 8; + pchip->cdev_torch.brightness_set = lm3639_torch_brightness_set; + ret = led_classdev_register((struct device *) + &client->dev, &pchip->cdev_torch); + if (ret < 0) { + dev_err(&client->dev, "fail : torch register\n"); + ret = -EIO; + goto err_torch; + } + + return 0; + +err_torch: + led_classdev_unregister(&pchip->cdev_flash); +err_flash: + device_remove_file(&(pchip->bled->dev), &dev_attr_bled_mode); +err_bled_mode: + backlight_device_unregister(pchip->bled); +err_out: + return ret; +} + +static int __devexit lm3639_remove(struct i2c_client *client) +{ + struct lm3639_chip_data *pchip = i2c_get_clientdata(client); + + regmap_write(pchip->regmap, REG_ENABLE, 0x00); + + if (&pchip->cdev_torch) + led_classdev_unregister(&pchip->cdev_torch); + if (&pchip->cdev_flash) + led_classdev_unregister(&pchip->cdev_flash); + if (pchip->bled) { + device_remove_file(&(pchip->bled->dev), &dev_attr_bled_mode); + backlight_device_unregister(pchip->bled); + } + return 0; +} + +static const struct i2c_device_id lm3639_id[] = { + {LM3639_NAME, 0}, + {} +}; + +MODULE_DEVICE_TABLE(i2c, lm3639_id); +static struct i2c_driver lm3639_i2c_driver = { + .driver = { + .name = LM3639_NAME, + }, + .probe = lm3639_probe, + .remove = __devexit_p(lm3639_remove), + .id_table = lm3639_id, +}; + +module_i2c_driver(lm3639_i2c_driver); + +MODULE_DESCRIPTION("Texas Instruments Backlight+Flash LED driver for LM3639"); +MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>"); +MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>"); +MODULE_LICENSE("GPL v2"); |