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