[linux.git] / drivers / leds / leds-menf21bmc.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 <[email protected]>");
MODULE_DESCRIPTION("MEN 14F021P00 BMC led driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:menf21bmc_led");
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
38433639 AW	2	/*
	3	* MEN 14F021P00 Board Management Controller (BMC) LEDs Driver.
	4	*
	5	* This is the core LED driver of the MEN 14F021P00 BMC.
	6	* There are four LEDs available which can be switched on and off.
	7	* STATUS LED, HOT SWAP LED, USER LED 1, USER LED 2
	8	*
	9	* Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH
38433639 AW	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/kernel.h>
	14	#include <linux/platform_device.h>
	15	#include <linux/leds.h>
	16	#include <linux/i2c.h>
	17
	18	#define BMC_CMD_LED_GET_SET 0xA0
	19	#define BMC_BIT_LED_STATUS BIT(0)
	20	#define BMC_BIT_LED_HOTSWAP BIT(1)
	21	#define BMC_BIT_LED_USER1 BIT(2)
	22	#define BMC_BIT_LED_USER2 BIT(3)
	23
	24	struct menf21bmc_led {
	25	struct led_classdev cdev;
	26	u8 led_bit;
	27	const char *name;
	28	struct i2c_client *i2c_client;
	29	};
	30
	31	static struct menf21bmc_led leds[] = {
	32	{
	33	.name = "menf21bmc:led_status",
	34	.led_bit = BMC_BIT_LED_STATUS,
	35	},
	36	{
	37	.name = "menf21bmc:led_hotswap",
	38	.led_bit = BMC_BIT_LED_HOTSWAP,
	39	},
	40	{
	41	.name = "menf21bmc:led_user1",
	42	.led_bit = BMC_BIT_LED_USER1,
	43	},
	44	{
	45	.name = "menf21bmc:led_user2",
	46	.led_bit = BMC_BIT_LED_USER2,
	47	}
	48	};
	49
	50	static DEFINE_MUTEX(led_lock);
	51
	52	static void
	53	menf21bmc_led_set(struct led_classdev *led_cdev, enum led_brightness value)
	54	{
	55	int led_val;
	56	struct menf21bmc_led *led = container_of(led_cdev,
	57	struct menf21bmc_led, cdev);
	58
	59	mutex_lock(&led_lock);
	60	led_val = i2c_smbus_read_byte_data(led->i2c_client,
	61	BMC_CMD_LED_GET_SET);
	62	if (led_val < 0)
	63	goto err_out;
	64
	65	if (value == LED_OFF)
	66	led_val &= ~led->led_bit;
	67	else
	68	led_val \|= led->led_bit;
	69
	70	i2c_smbus_write_byte_data(led->i2c_client,
	71	BMC_CMD_LED_GET_SET, led_val);
	72	err_out:
	73	mutex_unlock(&led_lock);
74	}
75
76	static int menf21bmc_led_probe(struct platform_device *pdev)
77	{
78	int i;
79	int ret;
80	struct i2c_client *i2c_client = to_i2c_client(pdev->dev.parent);
81
82	for (i = 0; i < ARRAY_SIZE(leds); i++) {
83	leds[i].cdev.name = leds[i].name;
84	leds[i].cdev.brightness_set = menf21bmc_led_set;
85	leds[i].i2c_client = i2c_client;
81aad9f8 MFW	86	ret = devm_led_classdev_register(&pdev->dev, &leds[i].cdev);
	87	if (ret < 0) {
	88	dev_err(&pdev->dev, "failed to register LED device\n");
	89	return ret;
	90	}
38433639 AW	91	}
	92	dev_info(&pdev->dev, "MEN 140F21P00 BMC LED device enabled\n");
	93
	94	return 0;
	95
38433639 AW	96	}
	97
	98	static struct platform_driver menf21bmc_led = {
	99	.probe = menf21bmc_led_probe,
38433639 AW	100	.driver = {
38433639 AW	101	.name = "menf21bmc_led",
38433639 AW	102	},
	103	};
	104
	105	module_platform_driver(menf21bmc_led);
	106
	107	MODULE_AUTHOR("Andreas Werner <[email protected]>");
	108	MODULE_DESCRIPTION("MEN 14F021P00 BMC led driver");
	109	MODULE_LICENSE("GPL v2");
	110	MODULE_ALIAS("platform:menf21bmc_led");