// SPDX-License-Identifier: GPL-2.0-or-later /* * Dell AIO Serial Backlight Driver * * Copyright (C) 2024 Hans de Goede <[email protected]> * Copyright (C) 2017 AceLan Kao <[email protected]> */ #define pr_fmt(fmt) … #include <linux/acpi.h> #include <linux/backlight.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/err.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/platform_device.h> #include <linux/serdev.h> #include <linux/string.h> #include <linux/types.h> #include <linux/wait.h> #include <acpi/video.h> #include "../serdev_helpers.h" /* The backlight controller must respond within 1 second */ #define DELL_BL_TIMEOUT … #define DELL_BL_MAX_BRIGHTNESS … /* Defines for the commands send to the controller */ /* 1st byte Start Of Frame 3 MSB bits: cmd-len + 01010 SOF marker */ #define DELL_SOF(len) … #define GET_CMD_LEN … #define SET_CMD_LEN … /* 2nd byte command */ #define CMD_GET_VERSION … #define CMD_SET_BRIGHTNESS … #define CMD_GET_BRIGHTNESS … #define CMD_SET_BL_POWER … /* Indexes and other defines for response received from the controller */ #define RESP_LEN … #define RESP_CMD … #define RESP_DATA … #define SET_RESP_LEN … #define GET_RESP_LEN … #define MIN_RESP_LEN … #define MAX_RESP_LEN … struct dell_uart_backlight { … }; /* Checksum: SUM(Length and Cmd and Data) xor 0xFF */ static u8 dell_uart_checksum(u8 *buf, int len) { … } static int dell_uart_bl_command(struct dell_uart_backlight *dell_bl, const u8 *cmd, int cmd_len, u8 *resp, int resp_max_len) { … } static int dell_uart_set_brightness(struct dell_uart_backlight *dell_bl, int brightness) { … } static int dell_uart_get_brightness(struct dell_uart_backlight *dell_bl) { … } static int dell_uart_set_bl_power(struct dell_uart_backlight *dell_bl, int power) { … } /* * There is no command to get backlight power status, * so we set the backlight power to "on" while initializing, * and then track and report its status by power variable. */ static int dell_uart_get_bl_power(struct dell_uart_backlight *dell_bl) { … } static int dell_uart_update_status(struct backlight_device *bd) { … } static int dell_uart_get_brightness_op(struct backlight_device *bd) { … } static const struct backlight_ops dell_uart_backlight_ops = …; static size_t dell_uart_bl_receive(struct serdev_device *serdev, const u8 *data, size_t len) { … } static const struct serdev_device_ops dell_uart_bl_serdev_ops = …; static int dell_uart_bl_serdev_probe(struct serdev_device *serdev) { … } struct serdev_device_driver dell_uart_bl_serdev_driver = …; static int dell_uart_bl_pdev_probe(struct platform_device *pdev) { … } static void dell_uart_bl_pdev_remove(struct platform_device *pdev) { … } static struct platform_driver dell_uart_bl_pdev_driver = …; module_platform_driver(…) …; MODULE_ALIAS(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …;
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