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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
111 lines
2.5 KiB
C
111 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* MEN 14F021P00 Board Management Controller (BMC) LEDs Driver.
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*
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* This is the core LED driver of the MEN 14F021P00 BMC.
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* There are four LEDs available which can be switched on and off.
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* STATUS LED, HOT SWAP LED, USER LED 1, USER LED 2
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*
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* Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/leds.h>
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#include <linux/i2c.h>
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#define BMC_CMD_LED_GET_SET 0xA0
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#define BMC_BIT_LED_STATUS BIT(0)
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#define BMC_BIT_LED_HOTSWAP BIT(1)
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#define BMC_BIT_LED_USER1 BIT(2)
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#define BMC_BIT_LED_USER2 BIT(3)
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struct menf21bmc_led {
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struct led_classdev cdev;
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u8 led_bit;
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const char *name;
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struct i2c_client *i2c_client;
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};
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static struct menf21bmc_led leds[] = {
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{
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.name = "menf21bmc:led_status",
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.led_bit = BMC_BIT_LED_STATUS,
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},
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{
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.name = "menf21bmc:led_hotswap",
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.led_bit = BMC_BIT_LED_HOTSWAP,
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},
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{
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.name = "menf21bmc:led_user1",
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.led_bit = BMC_BIT_LED_USER1,
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},
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{
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.name = "menf21bmc:led_user2",
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.led_bit = BMC_BIT_LED_USER2,
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}
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};
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static DEFINE_MUTEX(led_lock);
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static void
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menf21bmc_led_set(struct led_classdev *led_cdev, enum led_brightness value)
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{
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int led_val;
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struct menf21bmc_led *led = container_of(led_cdev,
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struct menf21bmc_led, cdev);
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mutex_lock(&led_lock);
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led_val = i2c_smbus_read_byte_data(led->i2c_client,
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BMC_CMD_LED_GET_SET);
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if (led_val < 0)
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goto err_out;
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if (value == LED_OFF)
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led_val &= ~led->led_bit;
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else
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led_val |= led->led_bit;
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i2c_smbus_write_byte_data(led->i2c_client,
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BMC_CMD_LED_GET_SET, led_val);
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err_out:
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mutex_unlock(&led_lock);
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}
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static int menf21bmc_led_probe(struct platform_device *pdev)
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{
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int i;
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int ret;
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struct i2c_client *i2c_client = to_i2c_client(pdev->dev.parent);
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for (i = 0; i < ARRAY_SIZE(leds); i++) {
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leds[i].cdev.name = leds[i].name;
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leds[i].cdev.brightness_set = menf21bmc_led_set;
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leds[i].i2c_client = i2c_client;
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ret = devm_led_classdev_register(&pdev->dev, &leds[i].cdev);
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if (ret < 0) {
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dev_err(&pdev->dev, "failed to register LED device\n");
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return ret;
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}
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}
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dev_info(&pdev->dev, "MEN 140F21P00 BMC LED device enabled\n");
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return 0;
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}
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static struct platform_driver menf21bmc_led = {
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.probe = menf21bmc_led_probe,
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.driver = {
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.name = "menf21bmc_led",
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},
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};
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module_platform_driver(menf21bmc_led);
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MODULE_AUTHOR("Andreas Werner <andreas.werner@men.de>");
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MODULE_DESCRIPTION("MEN 14F021P00 BMC led driver");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:menf21bmc_led");
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