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03f613f0 LR |
1 | // SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0-or-later |
2 | /* | |
3 | * Dell Wyse 3020 a.k.a. "Ariel" Embedded Controller LED Driver | |
4 | * | |
5 | * Copyright (C) 2020 Lubomir Rintel | |
6 | */ | |
7 | ||
8 | #include <linux/module.h> | |
9 | #include <linux/leds.h> | |
3192f141 | 10 | #include <linux/platform_device.h> |
03f613f0 | 11 | #include <linux/regmap.h> |
03f613f0 LR |
12 | |
13 | enum ec_index { | |
14 | EC_BLUE_LED = 0x01, | |
15 | EC_AMBER_LED = 0x02, | |
16 | EC_GREEN_LED = 0x03, | |
17 | }; | |
18 | ||
19 | enum { | |
20 | EC_LED_OFF = 0x00, | |
21 | EC_LED_STILL = 0x01, | |
22 | EC_LED_FADE = 0x02, | |
23 | EC_LED_BLINK = 0x03, | |
24 | }; | |
25 | ||
26 | struct ariel_led { | |
27 | struct regmap *ec_ram; | |
28 | enum ec_index ec_index; | |
29 | struct led_classdev led_cdev; | |
30 | }; | |
31 | ||
32 | #define led_cdev_to_ariel_led(c) container_of(c, struct ariel_led, led_cdev) | |
33 | ||
34 | static enum led_brightness ariel_led_get(struct led_classdev *led_cdev) | |
35 | { | |
36 | struct ariel_led *led = led_cdev_to_ariel_led(led_cdev); | |
37 | unsigned int led_status = 0; | |
38 | ||
39 | if (regmap_read(led->ec_ram, led->ec_index, &led_status)) | |
40 | return LED_OFF; | |
41 | ||
42 | if (led_status == EC_LED_STILL) | |
43 | return LED_FULL; | |
44 | else | |
45 | return LED_OFF; | |
46 | } | |
47 | ||
48 | static void ariel_led_set(struct led_classdev *led_cdev, | |
49 | enum led_brightness brightness) | |
50 | { | |
51 | struct ariel_led *led = led_cdev_to_ariel_led(led_cdev); | |
52 | ||
53 | if (brightness == LED_OFF) | |
54 | regmap_write(led->ec_ram, led->ec_index, EC_LED_OFF); | |
55 | else | |
56 | regmap_write(led->ec_ram, led->ec_index, EC_LED_STILL); | |
57 | } | |
58 | ||
59 | static int ariel_blink_set(struct led_classdev *led_cdev, | |
60 | unsigned long *delay_on, unsigned long *delay_off) | |
61 | { | |
62 | struct ariel_led *led = led_cdev_to_ariel_led(led_cdev); | |
63 | ||
64 | if (*delay_on == 0 && *delay_off == 0) | |
65 | return -EINVAL; | |
66 | ||
67 | if (*delay_on == 0) { | |
68 | regmap_write(led->ec_ram, led->ec_index, EC_LED_OFF); | |
69 | } else if (*delay_off == 0) { | |
70 | regmap_write(led->ec_ram, led->ec_index, EC_LED_STILL); | |
71 | } else { | |
72 | *delay_on = 500; | |
73 | *delay_off = 500; | |
74 | regmap_write(led->ec_ram, led->ec_index, EC_LED_BLINK); | |
75 | } | |
76 | ||
77 | return 0; | |
78 | } | |
79 | ||
80 | #define NLEDS 3 | |
81 | ||
82 | static int ariel_led_probe(struct platform_device *pdev) | |
83 | { | |
84 | struct device *dev = &pdev->dev; | |
85 | struct ariel_led *leds; | |
86 | struct regmap *ec_ram; | |
87 | int ret; | |
88 | int i; | |
89 | ||
90 | ec_ram = dev_get_regmap(dev->parent, "ec_ram"); | |
91 | if (!ec_ram) | |
92 | return -ENODEV; | |
93 | ||
94 | leds = devm_kcalloc(dev, NLEDS, sizeof(*leds), GFP_KERNEL); | |
95 | if (!leds) | |
96 | return -ENOMEM; | |
97 | ||
98 | leds[0].ec_index = EC_BLUE_LED; | |
47854d2d | 99 | leds[0].led_cdev.name = "blue:power"; |
03f613f0 LR |
100 | leds[0].led_cdev.default_trigger = "default-on"; |
101 | ||
102 | leds[1].ec_index = EC_AMBER_LED; | |
47854d2d | 103 | leds[1].led_cdev.name = "amber:status"; |
03f613f0 LR |
104 | |
105 | leds[2].ec_index = EC_GREEN_LED; | |
47854d2d | 106 | leds[2].led_cdev.name = "green:status"; |
03f613f0 LR |
107 | leds[2].led_cdev.default_trigger = "default-on"; |
108 | ||
109 | for (i = 0; i < NLEDS; i++) { | |
110 | leds[i].ec_ram = ec_ram; | |
111 | leds[i].led_cdev.brightness_get = ariel_led_get; | |
112 | leds[i].led_cdev.brightness_set = ariel_led_set; | |
113 | leds[i].led_cdev.blink_set = ariel_blink_set; | |
114 | ||
115 | ret = devm_led_classdev_register(dev, &leds[i].led_cdev); | |
116 | if (ret) | |
117 | return ret; | |
118 | } | |
119 | ||
120 | return 0; | |
121 | } | |
122 | ||
123 | static struct platform_driver ariel_led_driver = { | |
124 | .probe = ariel_led_probe, | |
125 | .driver = { | |
126 | .name = "dell-wyse-ariel-led", | |
127 | }, | |
128 | }; | |
129 | module_platform_driver(ariel_led_driver); | |
130 | ||
131 | MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>"); | |
132 | MODULE_DESCRIPTION("Dell Wyse 3020 Status LEDs Driver"); | |
133 | MODULE_LICENSE("Dual BSD/GPL"); |