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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>
10#include <linux/platform_device.h>
11#include <linux/regmap.h>
12
13enum ec_index {
14 EC_BLUE_LED = 0x01,
15 EC_AMBER_LED = 0x02,
16 EC_GREEN_LED = 0x03,
17};
18
19enum {
20 EC_LED_OFF = 0x00,
21 EC_LED_STILL = 0x01,
22 EC_LED_FADE = 0x02,
23 EC_LED_BLINK = 0x03,
24};
25
26struct 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
34static 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
48static 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
59static 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
82static 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;
99 leds[0].led_cdev.name = "blue:power";
100 leds[0].led_cdev.default_trigger = "default-on";
101
102 leds[1].ec_index = EC_AMBER_LED;
103 leds[1].led_cdev.name = "amber:status";
104
105 leds[2].ec_index = EC_GREEN_LED;
106 leds[2].led_cdev.name = "green:status";
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
123static struct platform_driver ariel_led_driver = {
124 .probe = ariel_led_probe,
125 .driver = {
126 .name = "dell-wyse-ariel-led",
127 },
128};
129module_platform_driver(ariel_led_driver);
130
131MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>");
132MODULE_DESCRIPTION("Dell Wyse 3020 Status LEDs Driver");
133MODULE_LICENSE("Dual BSD/GPL");
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>
10#include <linux/regmap.h>
11#include <linux/of_platform.h>
12
13enum ec_index {
14 EC_BLUE_LED = 0x01,
15 EC_AMBER_LED = 0x02,
16 EC_GREEN_LED = 0x03,
17};
18
19enum {
20 EC_LED_OFF = 0x00,
21 EC_LED_STILL = 0x01,
22 EC_LED_FADE = 0x02,
23 EC_LED_BLINK = 0x03,
24};
25
26struct 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
34static 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
48static 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
59static 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
82static 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;
99 leds[0].led_cdev.name = "blue:power";
100 leds[0].led_cdev.default_trigger = "default-on";
101
102 leds[1].ec_index = EC_AMBER_LED;
103 leds[1].led_cdev.name = "amber:status";
104
105 leds[2].ec_index = EC_GREEN_LED;
106 leds[2].led_cdev.name = "green:status";
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
123static struct platform_driver ariel_led_driver = {
124 .probe = ariel_led_probe,
125 .driver = {
126 .name = "dell-wyse-ariel-led",
127 },
128};
129module_platform_driver(ariel_led_driver);
130
131MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>");
132MODULE_DESCRIPTION("Dell Wyse 3020 Status LEDs Driver");
133MODULE_LICENSE("Dual BSD/GPL");