| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Simple driver for Texas Instruments LM3639 Backlight + Flash LED driver chip |
| * Copyright (C) 2012 Texas Instruments |
| */ |
| #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 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; |
| reg_val |= pdata->bled_pins; |
| } else { |
| reg_val = pdata->fled_pins; |
| reg_val |= 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 ret; |
| |
| out_input: |
| dev_err(pchip->dev, "%s:input conversion fail\n", __func__); |
| return ret; |
| |
| } |
| |
| static DEVICE_ATTR(bled_mode, S_IWUSR, 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"); |
| } |
| |
| /* 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"); |
| } |
| |
| static const struct regmap_config lm3639_regmap = { |
| .reg_bits = 8, |
| .val_bits = 8, |
| .max_register = REG_MAX, |
| }; |
| |
| static int lm3639_probe(struct i2c_client *client, |
| const struct i2c_device_id *id) |
| { |
| int ret; |
| struct lm3639_chip_data *pchip; |
| struct lm3639_platform_data *pdata = dev_get_platdata(&client->dev); |
| 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 = |
| devm_backlight_device_register(pchip->dev, "lm3639_bled", |
| pchip->dev, pchip, &lm3639_bled_ops, |
| &props); |
| if (IS_ERR(pchip->bled)) { |
| dev_err(&client->dev, "fail : backlight register\n"); |
| ret = PTR_ERR(pchip->bled); |
| 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"); |
| goto err_out; |
| } |
| |
| /* 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"); |
| 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"); |
| 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_out: |
| return ret; |
| } |
| |
| static int lm3639_remove(struct i2c_client *client) |
| { |
| struct lm3639_chip_data *pchip = i2c_get_clientdata(client); |
| |
| regmap_write(pchip->regmap, REG_ENABLE, 0x00); |
| |
| led_classdev_unregister(&pchip->cdev_torch); |
| led_classdev_unregister(&pchip->cdev_flash); |
| if (pchip->bled) |
| device_remove_file(&(pchip->bled->dev), &dev_attr_bled_mode); |
| 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 = 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 <gshark.jeong@gmail.com>"); |
| MODULE_AUTHOR("Ldd Mlp <ldd-mlp@list.ti.com>"); |
| MODULE_LICENSE("GPL v2"); |