1 | // SPDX-License-Identifier: GPL-2.0-or-later |
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 |
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(client: 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(client: led->i2c_client, |
71 | BMC_CMD_LED_GET_SET, value: led_val); |
72 | err_out: |
73 | mutex_unlock(lock: &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; |
86 | ret = devm_led_classdev_register(parent: &pdev->dev, led_cdev: &leds[i].cdev); |
87 | if (ret < 0) { |
88 | dev_err(&pdev->dev, "failed to register LED device\n" ); |
89 | return ret; |
90 | } |
91 | } |
92 | dev_info(&pdev->dev, "MEN 140F21P00 BMC LED device enabled\n" ); |
93 | |
94 | return 0; |
95 | |
96 | } |
97 | |
98 | static struct platform_driver menf21bmc_led = { |
99 | .probe = menf21bmc_led_probe, |
100 | .driver = { |
101 | .name = "menf21bmc_led" , |
102 | }, |
103 | }; |
104 | |
105 | module_platform_driver(menf21bmc_led); |
106 | |
107 | MODULE_AUTHOR("Andreas Werner <andreas.werner@men.de>" ); |
108 | MODULE_DESCRIPTION("MEN 14F021P00 BMC led driver" ); |
109 | MODULE_LICENSE("GPL v2" ); |
110 | MODULE_ALIAS("platform:menf21bmc_led" ); |
111 | |