// SPDX-License-Identifier: GPL-2.0-only /* * TI LP855x Backlight Driver * * Copyright (C) 2011 Texas Instruments */ #include <linux/acpi.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/i2c.h> #include <linux/backlight.h> #include <linux/delay.h> #include <linux/err.h> #include <linux/of.h> #include <linux/platform_data/lp855x.h> #include <linux/pwm.h> #include <linux/regulator/consumer.h> /* LP8550/1/2/3/6 Registers */ #define LP855X_BRIGHTNESS_CTRL … #define LP855X_DEVICE_CTRL … #define LP855X_EEPROM_START … #define LP855X_EEPROM_END … #define LP8556_EPROM_START … #define LP8556_EPROM_END … /* LP8555/7 Registers */ #define LP8557_BL_CMD … #define LP8557_BL_MASK … #define LP8557_BL_ON … #define LP8557_BL_OFF … #define LP8557_BRIGHTNESS_CTRL … #define LP8557_CONFIG … #define LP8555_EPROM_START … #define LP8555_EPROM_END … #define LP8557_EPROM_START … #define LP8557_EPROM_END … #define DEFAULT_BL_NAME … #define MAX_BRIGHTNESS … enum lp855x_brightness_ctrl_mode { … }; struct lp855x; /* * struct lp855x_device_config * @pre_init_device: init device function call before updating the brightness * @reg_brightness: register address for brigthenss control * @reg_devicectrl: register address for device control * @post_init_device: late init device function call */ struct lp855x_device_config { … }; struct lp855x { … }; static int lp855x_write_byte(struct lp855x *lp, u8 reg, u8 data) { … } static int lp855x_update_bit(struct lp855x *lp, u8 reg, u8 mask, u8 data) { … } static bool lp855x_is_valid_rom_area(struct lp855x *lp, u8 addr) { … } static int lp8557_bl_off(struct lp855x *lp) { … } static int lp8557_bl_on(struct lp855x *lp) { … } static struct lp855x_device_config lp855x_dev_cfg = …; static struct lp855x_device_config lp8557_dev_cfg = …; /* * Device specific configuration flow * * a) pre_init_device(optional) * b) update the brightness register * c) update device control register * d) update ROM area(optional) * e) post_init_device(optional) * */ static int lp855x_configure(struct lp855x *lp) { … } static int lp855x_pwm_ctrl(struct lp855x *lp, int br, int max_br) { … } static int lp855x_bl_update_status(struct backlight_device *bl) { … } static const struct backlight_ops lp855x_bl_ops = …; static int lp855x_backlight_register(struct lp855x *lp) { … } static ssize_t lp855x_get_chip_id(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t lp855x_get_bl_ctl_mode(struct device *dev, struct device_attribute *attr, char *buf) { … } static DEVICE_ATTR(chip_id, S_IRUGO, lp855x_get_chip_id, NULL); static DEVICE_ATTR(bl_ctl_mode, S_IRUGO, lp855x_get_bl_ctl_mode, NULL); static struct attribute *lp855x_attributes[] = …; static const struct attribute_group lp855x_attr_group = …; #ifdef CONFIG_OF static int lp855x_parse_dt(struct lp855x *lp) { … } #else static int lp855x_parse_dt(struct lp855x *lp) { return -EINVAL; } #endif static int lp855x_parse_acpi(struct lp855x *lp) { … } static int lp855x_probe(struct i2c_client *cl) { … } static void lp855x_remove(struct i2c_client *cl) { … } static const struct of_device_id lp855x_dt_ids[] __maybe_unused = …; MODULE_DEVICE_TABLE(of, lp855x_dt_ids); static const struct i2c_device_id lp855x_ids[] = …; MODULE_DEVICE_TABLE(i2c, lp855x_ids); #ifdef CONFIG_ACPI static const struct acpi_device_id lp855x_acpi_match[] = …; MODULE_DEVICE_TABLE(acpi, lp855x_acpi_match); #endif static struct i2c_driver lp855x_driver = …; module_i2c_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …;
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