// SPDX-License-Identifier: GPL-2.0 /* * CZ.NIC's Turris Omnia LEDs driver * * 2020, 2023 by Marek Behún <[email protected]> */ #include <linux/i2c.h> #include <linux/led-class-multicolor.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/of.h> #include "leds.h" #define OMNIA_BOARD_LEDS … #define OMNIA_LED_NUM_CHANNELS … /* MCU controller commands at I2C address 0x2a */ #define OMNIA_MCU_I2C_ADDR … #define CMD_GET_STATUS_WORD … #define STS_FEATURES_SUPPORTED … #define CMD_GET_FEATURES … #define FEAT_LED_GAMMA_CORRECTION … /* LED controller commands at I2C address 0x2b */ #define CMD_LED_MODE … #define CMD_LED_MODE_LED(l) … #define CMD_LED_MODE_USER … #define CMD_LED_STATE … #define CMD_LED_STATE_LED(l) … #define CMD_LED_STATE_ON … #define CMD_LED_COLOR … #define CMD_LED_SET_BRIGHTNESS … #define CMD_LED_GET_BRIGHTNESS … #define CMD_SET_GAMMA_CORRECTION … #define CMD_GET_GAMMA_CORRECTION … struct omnia_led { … }; #define to_omnia_led(l) … struct omnia_leds { … }; static int omnia_cmd_write_u8(const struct i2c_client *client, u8 cmd, u8 val) { … } static int omnia_cmd_read_raw(struct i2c_adapter *adapter, u8 addr, u8 cmd, void *reply, size_t len) { … } static int omnia_cmd_read_u8(const struct i2c_client *client, u8 cmd) { … } static int omnia_led_send_color_cmd(const struct i2c_client *client, struct omnia_led *led) { … } /* Determine if the computed RGB channels are different from the cached ones */ static bool omnia_led_channels_changed(struct omnia_led *led) { … } static int omnia_led_brightness_set_blocking(struct led_classdev *cdev, enum led_brightness brightness) { … } static struct led_hw_trigger_type omnia_hw_trigger_type; static int omnia_hwtrig_activate(struct led_classdev *cdev) { … } static void omnia_hwtrig_deactivate(struct led_classdev *cdev) { … } static struct led_trigger omnia_hw_trigger = …; static int omnia_led_register(struct i2c_client *client, struct omnia_led *led, struct device_node *np) { … } /* * On the front panel of the Turris Omnia router there is also a button which * can be used to control the intensity of all the LEDs at once, so that if they * are too bright, user can dim them. * The microcontroller cycles between 8 levels of this global brightness (from * 100% to 0%), but this setting can have any integer value between 0 and 100. * It is therefore convenient to be able to change this setting from software. * We expose this setting via a sysfs attribute file called "brightness". This * file lives in the device directory of the LED controller, not an individual * LED, so it should not confuse users. */ static ssize_t brightness_show(struct device *dev, struct device_attribute *a, char *buf) { … } static ssize_t brightness_store(struct device *dev, struct device_attribute *a, const char *buf, size_t count) { … } static DEVICE_ATTR_RW(brightness); static ssize_t gamma_correction_show(struct device *dev, struct device_attribute *a, char *buf) { … } static ssize_t gamma_correction_store(struct device *dev, struct device_attribute *a, const char *buf, size_t count) { … } static DEVICE_ATTR_RW(gamma_correction); static struct attribute *omnia_led_controller_attrs[] = …; ATTRIBUTE_GROUPS(…); static int omnia_mcu_get_features(const struct i2c_client *client) { … } static int omnia_leds_probe(struct i2c_client *client) { … } static void omnia_leds_remove(struct i2c_client *client) { … } static const struct of_device_id of_omnia_leds_match[] = …; static const struct i2c_device_id omnia_id[] = …; MODULE_DEVICE_TABLE(i2c, omnia_id); static struct i2c_driver omnia_leds_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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