111 lines
2.5 KiB
C
111 lines
2.5 KiB
C
// 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");
|