| /* |
| * Simple driver for Texas Instruments LM3630 Backlight 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/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/lm3630_bl.h> |
| |
| #define REG_CTRL 0x00 |
| #define REG_CONFIG 0x01 |
| #define REG_BRT_A 0x03 |
| #define REG_BRT_B 0x04 |
| #define REG_INT_STATUS 0x09 |
| #define REG_INT_EN 0x0A |
| #define REG_FAULT 0x0B |
| #define REG_PWM_OUTLOW 0x12 |
| #define REG_PWM_OUTHIGH 0x13 |
| #define REG_MAX 0x1F |
| |
| #define INT_DEBOUNCE_MSEC 10 |
| |
| enum lm3630_leds { |
| BLED_ALL = 0, |
| BLED_1, |
| BLED_2 |
| }; |
| |
| static const char *bled_name[] = { |
| [BLED_ALL] = "lm3630_bled", /*Bank1 controls all string */ |
| [BLED_1] = "lm3630_bled1", /*Bank1 controls bled1 */ |
| [BLED_2] = "lm3630_bled2", /*Bank1 or 2 controls bled2 */ |
| }; |
| |
| struct lm3630_chip_data { |
| struct device *dev; |
| struct delayed_work work; |
| int irq; |
| struct workqueue_struct *irqthread; |
| struct lm3630_platform_data *pdata; |
| struct backlight_device *bled1; |
| struct backlight_device *bled2; |
| struct regmap *regmap; |
| }; |
| |
| /* initialize chip */ |
| static int lm3630_chip_init(struct lm3630_chip_data *pchip) |
| { |
| int ret; |
| unsigned int reg_val; |
| struct lm3630_platform_data *pdata = pchip->pdata; |
| |
| /*pwm control */ |
| reg_val = ((pdata->pwm_active & 0x01) << 2) | (pdata->pwm_ctrl & 0x03); |
| ret = regmap_update_bits(pchip->regmap, REG_CONFIG, 0x07, reg_val); |
| if (ret < 0) |
| goto out; |
| |
| /* bank control */ |
| reg_val = ((pdata->bank_b_ctrl & 0x01) << 1) | |
| (pdata->bank_a_ctrl & 0x07); |
| ret = regmap_update_bits(pchip->regmap, REG_CTRL, 0x07, reg_val); |
| if (ret < 0) |
| goto out; |
| |
| ret = regmap_update_bits(pchip->regmap, REG_CTRL, 0x80, 0x00); |
| if (ret < 0) |
| goto out; |
| |
| /* set initial brightness */ |
| if (pdata->bank_a_ctrl != BANK_A_CTRL_DISABLE) { |
| ret = regmap_write(pchip->regmap, |
| REG_BRT_A, pdata->init_brt_led1); |
| if (ret < 0) |
| goto out; |
| } |
| |
| if (pdata->bank_b_ctrl != BANK_B_CTRL_DISABLE) { |
| ret = regmap_write(pchip->regmap, |
| REG_BRT_B, pdata->init_brt_led2); |
| if (ret < 0) |
| goto out; |
| } |
| return ret; |
| |
| out: |
| dev_err(pchip->dev, "i2c failed to access register\n"); |
| return ret; |
| } |
| |
| /* interrupt handling */ |
| static void lm3630_delayed_func(struct work_struct *work) |
| { |
| int ret; |
| unsigned int reg_val; |
| struct lm3630_chip_data *pchip; |
| |
| pchip = container_of(work, struct lm3630_chip_data, work.work); |
| |
| ret = regmap_read(pchip->regmap, REG_INT_STATUS, ®_val); |
| if (ret < 0) { |
| dev_err(pchip->dev, |
| "i2c failed to access REG_INT_STATUS Register\n"); |
| return; |
| } |
| |
| dev_info(pchip->dev, "REG_INT_STATUS Register is 0x%x\n", reg_val); |
| } |
| |
| static irqreturn_t lm3630_isr_func(int irq, void *chip) |
| { |
| int ret; |
| struct lm3630_chip_data *pchip = chip; |
| unsigned long delay = msecs_to_jiffies(INT_DEBOUNCE_MSEC); |
| |
| queue_delayed_work(pchip->irqthread, &pchip->work, delay); |
| |
| ret = regmap_update_bits(pchip->regmap, REG_CTRL, 0x80, 0x00); |
| if (ret < 0) |
| goto out; |
| |
| return IRQ_HANDLED; |
| out: |
| dev_err(pchip->dev, "i2c failed to access register\n"); |
| return IRQ_HANDLED; |
| } |
| |
| static int lm3630_intr_config(struct lm3630_chip_data *pchip) |
| { |
| INIT_DELAYED_WORK(&pchip->work, lm3630_delayed_func); |
| pchip->irqthread = create_singlethread_workqueue("lm3630-irqthd"); |
| if (!pchip->irqthread) { |
| dev_err(pchip->dev, "create irq thread fail...\n"); |
| return -1; |
| } |
| if (request_threaded_irq |
| (pchip->irq, NULL, lm3630_isr_func, |
| IRQF_TRIGGER_FALLING | IRQF_ONESHOT, "lm3630_irq", pchip)) { |
| dev_err(pchip->dev, "request threaded irq fail..\n"); |
| return -1; |
| } |
| return 0; |
| } |
| |
| static bool |
| set_intensity(struct backlight_device *bl, struct lm3630_chip_data *pchip) |
| { |
| if (!pchip->pdata->pwm_set_intensity) |
| return false; |
| pchip->pdata->pwm_set_intensity(bl->props.brightness - 1, |
| pchip->pdata->pwm_period); |
| return true; |
| } |
| |
| /* update and get brightness */ |
| static int lm3630_bank_a_update_status(struct backlight_device *bl) |
| { |
| int ret; |
| struct lm3630_chip_data *pchip = bl_get_data(bl); |
| enum lm3630_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl; |
| |
| /* brightness 0 means disable */ |
| if (!bl->props.brightness) { |
| ret = regmap_update_bits(pchip->regmap, REG_CTRL, 0x04, 0x00); |
| if (ret < 0) |
| goto out; |
| return bl->props.brightness; |
| } |
| |
| /* pwm control */ |
| if (pwm_ctrl == PWM_CTRL_BANK_A || pwm_ctrl == PWM_CTRL_BANK_ALL) { |
| if (!set_intensity(bl, pchip)) |
| dev_err(pchip->dev, "No pwm control func. in plat-data\n"); |
| } else { |
| |
| /* i2c control */ |
| ret = regmap_update_bits(pchip->regmap, REG_CTRL, 0x80, 0x00); |
| if (ret < 0) |
| goto out; |
| mdelay(1); |
| ret = regmap_write(pchip->regmap, |
| REG_BRT_A, bl->props.brightness - 1); |
| if (ret < 0) |
| goto out; |
| } |
| return bl->props.brightness; |
| out: |
| dev_err(pchip->dev, "i2c failed to access REG_CTRL\n"); |
| return bl->props.brightness; |
| } |
| |
| static int lm3630_bank_a_get_brightness(struct backlight_device *bl) |
| { |
| unsigned int reg_val; |
| int brightness, ret; |
| struct lm3630_chip_data *pchip = bl_get_data(bl); |
| enum lm3630_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl; |
| |
| if (pwm_ctrl == PWM_CTRL_BANK_A || pwm_ctrl == PWM_CTRL_BANK_ALL) { |
| ret = regmap_read(pchip->regmap, REG_PWM_OUTHIGH, ®_val); |
| if (ret < 0) |
| goto out; |
| brightness = reg_val & 0x01; |
| ret = regmap_read(pchip->regmap, REG_PWM_OUTLOW, ®_val); |
| if (ret < 0) |
| goto out; |
| brightness = ((brightness << 8) | reg_val) + 1; |
| } else { |
| ret = regmap_update_bits(pchip->regmap, REG_CTRL, 0x80, 0x00); |
| if (ret < 0) |
| goto out; |
| mdelay(1); |
| ret = regmap_read(pchip->regmap, REG_BRT_A, ®_val); |
| if (ret < 0) |
| goto out; |
| brightness = reg_val + 1; |
| } |
| bl->props.brightness = brightness; |
| return bl->props.brightness; |
| out: |
| dev_err(pchip->dev, "i2c failed to access register\n"); |
| return 0; |
| } |
| |
| static const struct backlight_ops lm3630_bank_a_ops = { |
| .options = BL_CORE_SUSPENDRESUME, |
| .update_status = lm3630_bank_a_update_status, |
| .get_brightness = lm3630_bank_a_get_brightness, |
| }; |
| |
| static int lm3630_bank_b_update_status(struct backlight_device *bl) |
| { |
| int ret; |
| struct lm3630_chip_data *pchip = bl_get_data(bl); |
| enum lm3630_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl; |
| |
| if (pwm_ctrl == PWM_CTRL_BANK_B || pwm_ctrl == PWM_CTRL_BANK_ALL) { |
| if (!set_intensity(bl, pchip)) |
| dev_err(pchip->dev, |
| "no pwm control func. in plat-data\n"); |
| } else { |
| ret = regmap_update_bits(pchip->regmap, REG_CTRL, 0x80, 0x00); |
| if (ret < 0) |
| goto out; |
| mdelay(1); |
| ret = regmap_write(pchip->regmap, |
| REG_BRT_B, bl->props.brightness - 1); |
| } |
| return bl->props.brightness; |
| out: |
| dev_err(pchip->dev, "i2c failed to access register\n"); |
| return bl->props.brightness; |
| } |
| |
| static int lm3630_bank_b_get_brightness(struct backlight_device *bl) |
| { |
| unsigned int reg_val; |
| int brightness, ret; |
| struct lm3630_chip_data *pchip = bl_get_data(bl); |
| enum lm3630_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl; |
| |
| if (pwm_ctrl == PWM_CTRL_BANK_B || pwm_ctrl == PWM_CTRL_BANK_ALL) { |
| ret = regmap_read(pchip->regmap, REG_PWM_OUTHIGH, ®_val); |
| if (ret < 0) |
| goto out; |
| brightness = reg_val & 0x01; |
| ret = regmap_read(pchip->regmap, REG_PWM_OUTLOW, ®_val); |
| if (ret < 0) |
| goto out; |
| brightness = ((brightness << 8) | reg_val) + 1; |
| } else { |
| ret = regmap_update_bits(pchip->regmap, REG_CTRL, 0x80, 0x00); |
| if (ret < 0) |
| goto out; |
| mdelay(1); |
| ret = regmap_read(pchip->regmap, REG_BRT_B, ®_val); |
| if (ret < 0) |
| goto out; |
| brightness = reg_val + 1; |
| } |
| bl->props.brightness = brightness; |
| |
| return bl->props.brightness; |
| out: |
| dev_err(pchip->dev, "i2c failed to access register\n"); |
| return bl->props.brightness; |
| } |
| |
| static const struct backlight_ops lm3630_bank_b_ops = { |
| .options = BL_CORE_SUSPENDRESUME, |
| .update_status = lm3630_bank_b_update_status, |
| .get_brightness = lm3630_bank_b_get_brightness, |
| }; |
| |
| static int lm3630_backlight_register(struct lm3630_chip_data *pchip, |
| enum lm3630_leds ledno) |
| { |
| const char *name = bled_name[ledno]; |
| struct backlight_properties props; |
| struct lm3630_platform_data *pdata = pchip->pdata; |
| |
| props.type = BACKLIGHT_RAW; |
| switch (ledno) { |
| case BLED_1: |
| case BLED_ALL: |
| props.brightness = pdata->init_brt_led1; |
| props.max_brightness = pdata->max_brt_led1; |
| pchip->bled1 = |
| backlight_device_register(name, pchip->dev, pchip, |
| &lm3630_bank_a_ops, &props); |
| if (IS_ERR(pchip->bled1)) |
| return -EIO; |
| break; |
| case BLED_2: |
| props.brightness = pdata->init_brt_led2; |
| props.max_brightness = pdata->max_brt_led2; |
| pchip->bled2 = |
| backlight_device_register(name, pchip->dev, pchip, |
| &lm3630_bank_b_ops, &props); |
| if (IS_ERR(pchip->bled2)) |
| return -EIO; |
| break; |
| } |
| return 0; |
| } |
| |
| static void lm3630_backlight_unregister(struct lm3630_chip_data *pchip) |
| { |
| if (pchip->bled1) |
| backlight_device_unregister(pchip->bled1); |
| if (pchip->bled2) |
| backlight_device_unregister(pchip->bled2); |
| } |
| |
| static const struct regmap_config lm3630_regmap = { |
| .reg_bits = 8, |
| .val_bits = 8, |
| .max_register = REG_MAX, |
| }; |
| |
| static int lm3630_probe(struct i2c_client *client, |
| const struct i2c_device_id *id) |
| { |
| struct lm3630_platform_data *pdata = client->dev.platform_data; |
| struct lm3630_chip_data *pchip; |
| int ret; |
| |
| if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { |
| dev_err(&client->dev, "fail : i2c functionality check...\n"); |
| return -EOPNOTSUPP; |
| } |
| |
| if (pdata == NULL) { |
| dev_err(&client->dev, "fail : no platform data.\n"); |
| return -ENODATA; |
| } |
| |
| pchip = devm_kzalloc(&client->dev, sizeof(struct lm3630_chip_data), |
| GFP_KERNEL); |
| if (!pchip) |
| return -ENOMEM; |
| pchip->pdata = pdata; |
| pchip->dev = &client->dev; |
| |
| pchip->regmap = devm_regmap_init_i2c(client, &lm3630_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 = lm3630_chip_init(pchip); |
| if (ret < 0) { |
| dev_err(&client->dev, "fail : init chip\n"); |
| goto err_chip_init; |
| } |
| |
| switch (pdata->bank_a_ctrl) { |
| case BANK_A_CTRL_ALL: |
| ret = lm3630_backlight_register(pchip, BLED_ALL); |
| pdata->bank_b_ctrl = BANK_B_CTRL_DISABLE; |
| break; |
| case BANK_A_CTRL_LED1: |
| ret = lm3630_backlight_register(pchip, BLED_1); |
| break; |
| case BANK_A_CTRL_LED2: |
| ret = lm3630_backlight_register(pchip, BLED_2); |
| pdata->bank_b_ctrl = BANK_B_CTRL_DISABLE; |
| break; |
| default: |
| break; |
| } |
| |
| if (ret < 0) |
| goto err_bl_reg; |
| |
| if (pdata->bank_b_ctrl && pchip->bled2 == NULL) { |
| ret = lm3630_backlight_register(pchip, BLED_2); |
| if (ret < 0) |
| goto err_bl_reg; |
| } |
| |
| /* interrupt enable : irq 0 is not allowed for lm3630 */ |
| pchip->irq = client->irq; |
| if (pchip->irq) |
| lm3630_intr_config(pchip); |
| |
| dev_info(&client->dev, "LM3630 backlight register OK.\n"); |
| return 0; |
| |
| err_bl_reg: |
| dev_err(&client->dev, "fail : backlight register.\n"); |
| lm3630_backlight_unregister(pchip); |
| err_chip_init: |
| return ret; |
| } |
| |
| static int lm3630_remove(struct i2c_client *client) |
| { |
| int ret; |
| struct lm3630_chip_data *pchip = i2c_get_clientdata(client); |
| |
| ret = regmap_write(pchip->regmap, REG_BRT_A, 0); |
| if (ret < 0) |
| dev_err(pchip->dev, "i2c failed to access register\n"); |
| |
| ret = regmap_write(pchip->regmap, REG_BRT_B, 0); |
| if (ret < 0) |
| dev_err(pchip->dev, "i2c failed to access register\n"); |
| |
| lm3630_backlight_unregister(pchip); |
| if (pchip->irq) { |
| free_irq(pchip->irq, pchip); |
| flush_workqueue(pchip->irqthread); |
| destroy_workqueue(pchip->irqthread); |
| } |
| return 0; |
| } |
| |
| static const struct i2c_device_id lm3630_id[] = { |
| {LM3630_NAME, 0}, |
| {} |
| }; |
| |
| MODULE_DEVICE_TABLE(i2c, lm3630_id); |
| |
| static struct i2c_driver lm3630_i2c_driver = { |
| .driver = { |
| .name = LM3630_NAME, |
| }, |
| .probe = lm3630_probe, |
| .remove = lm3630_remove, |
| .id_table = lm3630_id, |
| }; |
| |
| module_i2c_driver(lm3630_i2c_driver); |
| |
| MODULE_DESCRIPTION("Texas Instruments Backlight driver for LM3630"); |
| MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>"); |
| MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>"); |
| MODULE_LICENSE("GPL v2"); |