// SPDX-License-Identifier: GPL-2.0-or-later /* * MEN 14F021P00 Board Management Controller (BMC) LEDs Driver. * * This is the core LED driver of the MEN 14F021P00 BMC. * There are four LEDs available which can be switched on and off. * STATUS LED, HOT SWAP LED, USER LED 1, USER LED 2 * * Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/platform_device.h> #include <linux/leds.h> #include <linux/i2c.h> #define BMC_CMD_LED_GET_SET 0xA0 #define BMC_BIT_LED_STATUS BIT(0) #define BMC_BIT_LED_HOTSWAP BIT(1) #define BMC_BIT_LED_USER1 BIT(2) #define BMC_BIT_LED_USER2 BIT(3) struct menf21bmc_led { struct led_classdev cdev; u8 led_bit; const char *name; struct i2c_client *i2c_client; }; static struct menf21bmc_led leds[] = { { .name = "menf21bmc:led_status", .led_bit = BMC_BIT_LED_STATUS, }, { .name = "menf21bmc:led_hotswap", .led_bit = BMC_BIT_LED_HOTSWAP, }, { .name = "menf21bmc:led_user1", .led_bit = BMC_BIT_LED_USER1, }, { .name = "menf21bmc:led_user2", .led_bit = BMC_BIT_LED_USER2, } }; static DEFINE_MUTEX(led_lock); static void menf21bmc_led_set(struct led_classdev *led_cdev, enum led_brightness value) { int led_val; struct menf21bmc_led *led = container_of(led_cdev, struct menf21bmc_led, cdev); mutex_lock(&led_lock); led_val = i2c_smbus_read_byte_data(led->i2c_client, BMC_CMD_LED_GET_SET); if (led_val < 0) goto err_out; if (value == LED_OFF) led_val &= ~led->led_bit; else led_val |= led->led_bit; i2c_smbus_write_byte_data(led->i2c_client, BMC_CMD_LED_GET_SET, led_val); err_out: mutex_unlock(&led_lock); } static int menf21bmc_led_probe(struct platform_device *pdev) { int i; int ret; struct i2c_client *i2c_client = to_i2c_client(pdev->dev.parent); for (i = 0; i < ARRAY_SIZE(leds); i++) { leds[i].cdev.name = leds[i].name; leds[i].cdev.brightness_set = menf21bmc_led_set; leds[i].i2c_client = i2c_client; ret = devm_led_classdev_register(&pdev->dev, &leds[i].cdev); if (ret < 0) { dev_err(&pdev->dev, "failed to register LED device\n"); return ret; } } dev_info(&pdev->dev, "MEN 140F21P00 BMC LED device enabled\n"); return 0; } static struct platform_driver menf21bmc_led = { .probe = menf21bmc_led_probe, .driver = { .name = "menf21bmc_led", }, }; module_platform_driver(menf21bmc_led); MODULE_AUTHOR("Andreas Werner <andreas.werner@men.de>"); MODULE_DESCRIPTION("MEN 14F021P00 BMC led driver"); MODULE_LICENSE("GPL v2"); MODULE_ALIAS("platform:menf21bmc_led");