1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * MEN 14F021P00 Board Management Controller (BMC) LEDs Driver.
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * This is the core LED driver of the MEN 14F021P00 BMC.
6*4882a593Smuzhiyun * There are four LEDs available which can be switched on and off.
7*4882a593Smuzhiyun * STATUS LED, HOT SWAP LED, USER LED 1, USER LED 2
8*4882a593Smuzhiyun *
9*4882a593Smuzhiyun * Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH
10*4882a593Smuzhiyun */
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #include <linux/module.h>
13*4882a593Smuzhiyun #include <linux/kernel.h>
14*4882a593Smuzhiyun #include <linux/platform_device.h>
15*4882a593Smuzhiyun #include <linux/leds.h>
16*4882a593Smuzhiyun #include <linux/i2c.h>
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun #define BMC_CMD_LED_GET_SET 0xA0
19*4882a593Smuzhiyun #define BMC_BIT_LED_STATUS BIT(0)
20*4882a593Smuzhiyun #define BMC_BIT_LED_HOTSWAP BIT(1)
21*4882a593Smuzhiyun #define BMC_BIT_LED_USER1 BIT(2)
22*4882a593Smuzhiyun #define BMC_BIT_LED_USER2 BIT(3)
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun struct menf21bmc_led {
25*4882a593Smuzhiyun struct led_classdev cdev;
26*4882a593Smuzhiyun u8 led_bit;
27*4882a593Smuzhiyun const char *name;
28*4882a593Smuzhiyun struct i2c_client *i2c_client;
29*4882a593Smuzhiyun };
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun static struct menf21bmc_led leds[] = {
32*4882a593Smuzhiyun {
33*4882a593Smuzhiyun .name = "menf21bmc:led_status",
34*4882a593Smuzhiyun .led_bit = BMC_BIT_LED_STATUS,
35*4882a593Smuzhiyun },
36*4882a593Smuzhiyun {
37*4882a593Smuzhiyun .name = "menf21bmc:led_hotswap",
38*4882a593Smuzhiyun .led_bit = BMC_BIT_LED_HOTSWAP,
39*4882a593Smuzhiyun },
40*4882a593Smuzhiyun {
41*4882a593Smuzhiyun .name = "menf21bmc:led_user1",
42*4882a593Smuzhiyun .led_bit = BMC_BIT_LED_USER1,
43*4882a593Smuzhiyun },
44*4882a593Smuzhiyun {
45*4882a593Smuzhiyun .name = "menf21bmc:led_user2",
46*4882a593Smuzhiyun .led_bit = BMC_BIT_LED_USER2,
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun };
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun static DEFINE_MUTEX(led_lock);
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun static void
menf21bmc_led_set(struct led_classdev * led_cdev,enum led_brightness value)53*4882a593Smuzhiyun menf21bmc_led_set(struct led_classdev *led_cdev, enum led_brightness value)
54*4882a593Smuzhiyun {
55*4882a593Smuzhiyun int led_val;
56*4882a593Smuzhiyun struct menf21bmc_led *led = container_of(led_cdev,
57*4882a593Smuzhiyun struct menf21bmc_led, cdev);
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun mutex_lock(&led_lock);
60*4882a593Smuzhiyun led_val = i2c_smbus_read_byte_data(led->i2c_client,
61*4882a593Smuzhiyun BMC_CMD_LED_GET_SET);
62*4882a593Smuzhiyun if (led_val < 0)
63*4882a593Smuzhiyun goto err_out;
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun if (value == LED_OFF)
66*4882a593Smuzhiyun led_val &= ~led->led_bit;
67*4882a593Smuzhiyun else
68*4882a593Smuzhiyun led_val |= led->led_bit;
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun i2c_smbus_write_byte_data(led->i2c_client,
71*4882a593Smuzhiyun BMC_CMD_LED_GET_SET, led_val);
72*4882a593Smuzhiyun err_out:
73*4882a593Smuzhiyun mutex_unlock(&led_lock);
74*4882a593Smuzhiyun }
75*4882a593Smuzhiyun
menf21bmc_led_probe(struct platform_device * pdev)76*4882a593Smuzhiyun static int menf21bmc_led_probe(struct platform_device *pdev)
77*4882a593Smuzhiyun {
78*4882a593Smuzhiyun int i;
79*4882a593Smuzhiyun int ret;
80*4882a593Smuzhiyun struct i2c_client *i2c_client = to_i2c_client(pdev->dev.parent);
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun for (i = 0; i < ARRAY_SIZE(leds); i++) {
83*4882a593Smuzhiyun leds[i].cdev.name = leds[i].name;
84*4882a593Smuzhiyun leds[i].cdev.brightness_set = menf21bmc_led_set;
85*4882a593Smuzhiyun leds[i].i2c_client = i2c_client;
86*4882a593Smuzhiyun ret = devm_led_classdev_register(&pdev->dev, &leds[i].cdev);
87*4882a593Smuzhiyun if (ret < 0) {
88*4882a593Smuzhiyun dev_err(&pdev->dev, "failed to register LED device\n");
89*4882a593Smuzhiyun return ret;
90*4882a593Smuzhiyun }
91*4882a593Smuzhiyun }
92*4882a593Smuzhiyun dev_info(&pdev->dev, "MEN 140F21P00 BMC LED device enabled\n");
93*4882a593Smuzhiyun
94*4882a593Smuzhiyun return 0;
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun }
97*4882a593Smuzhiyun
98*4882a593Smuzhiyun static struct platform_driver menf21bmc_led = {
99*4882a593Smuzhiyun .probe = menf21bmc_led_probe,
100*4882a593Smuzhiyun .driver = {
101*4882a593Smuzhiyun .name = "menf21bmc_led",
102*4882a593Smuzhiyun },
103*4882a593Smuzhiyun };
104*4882a593Smuzhiyun
105*4882a593Smuzhiyun module_platform_driver(menf21bmc_led);
106*4882a593Smuzhiyun
107*4882a593Smuzhiyun MODULE_AUTHOR("Andreas Werner <andreas.werner@men.de>");
108*4882a593Smuzhiyun MODULE_DESCRIPTION("MEN 14F021P00 BMC led driver");
109*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
110*4882a593Smuzhiyun MODULE_ALIAS("platform:menf21bmc_led");
111