38433639af
Added driver to support the 14F021P00 BMC LEDs. The BMC is a Board Management Controller including four LEDs which can be switched on and off. Signed-off-by: Andreas Werner <andreas.werner@men.de> Acked-by: Bryan Wu <cooloney@gmail.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
132 lines
3.1 KiB
C
132 lines
3.1 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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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 = led_classdev_register(&pdev->dev, &leds[i].cdev);
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if (ret < 0)
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goto err_free_leds;
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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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err_free_leds:
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dev_err(&pdev->dev, "failed to register LED device\n");
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for (i = i - 1; i >= 0; i--)
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led_classdev_unregister(&leds[i].cdev);
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return ret;
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}
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static int menf21bmc_led_remove(struct platform_device *pdev)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(leds); i++)
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led_classdev_unregister(&leds[i].cdev);
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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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.remove = menf21bmc_led_remove,
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.driver = {
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.name = "menf21bmc_led",
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.owner = THIS_MODULE,
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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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