tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-only
2/* Copyright (c) 2010, 2011, 2016 The Linux Foundation. All rights reserved.
3 */
4#include <linux/leds.h>
5#include <linux/module.h>
6#include <linux/of.h>
7#include <linux/of_device.h>
8#include <linux/platform_device.h>
9#include <linux/pm.h>
10#include <linux/regmap.h>
11
12#define PM8058_LED_TYPE_COMMON 0x00
13#define PM8058_LED_TYPE_KEYPAD 0x01
14#define PM8058_LED_TYPE_FLASH 0x02
15
16#define PM8058_LED_TYPE_COMMON_MASK 0xf8
17#define PM8058_LED_TYPE_KEYPAD_MASK 0xf0
18#define PM8058_LED_TYPE_COMMON_SHIFT 3
19#define PM8058_LED_TYPE_KEYPAD_SHIFT 4
20
21struct pm8058_led {
22 struct regmap *map;
23 u32 reg;
24 u32 ledtype;
25 struct led_classdev cdev;
26};
27
28static void pm8058_led_set(struct led_classdev *cled,
29 enum led_brightness value)
30{
31 struct pm8058_led *led;
32 int ret = 0;
33 unsigned int mask = 0;
34 unsigned int val = 0;
35
36 led = container_of(cled, struct pm8058_led, cdev);
37 switch (led->ledtype) {
38 case PM8058_LED_TYPE_COMMON:
39 mask = PM8058_LED_TYPE_COMMON_MASK;
40 val = value << PM8058_LED_TYPE_COMMON_SHIFT;
41 break;
42 case PM8058_LED_TYPE_KEYPAD:
43 case PM8058_LED_TYPE_FLASH:
44 mask = PM8058_LED_TYPE_KEYPAD_MASK;
45 val = value << PM8058_LED_TYPE_KEYPAD_SHIFT;
46 break;
47 default:
48 break;
49 }
50
51 ret = regmap_update_bits(led->map, led->reg, mask, val);
52 if (ret)
53 pr_err("Failed to set LED brightness\n");
54}
55
56static enum led_brightness pm8058_led_get(struct led_classdev *cled)
57{
58 struct pm8058_led *led;
59 int ret;
60 unsigned int val;
61
62 led = container_of(cled, struct pm8058_led, cdev);
63
64 ret = regmap_read(led->map, led->reg, &val);
65 if (ret) {
66 pr_err("Failed to get LED brightness\n");
67 return LED_OFF;
68 }
69
70 switch (led->ledtype) {
71 case PM8058_LED_TYPE_COMMON:
72 val &= PM8058_LED_TYPE_COMMON_MASK;
73 val >>= PM8058_LED_TYPE_COMMON_SHIFT;
74 break;
75 case PM8058_LED_TYPE_KEYPAD:
76 case PM8058_LED_TYPE_FLASH:
77 val &= PM8058_LED_TYPE_KEYPAD_MASK;
78 val >>= PM8058_LED_TYPE_KEYPAD_SHIFT;
79 break;
80 default:
81 val = LED_OFF;
82 break;
83 }
84
85 return val;
86}
87
88static int pm8058_led_probe(struct platform_device *pdev)
89{
90 struct led_init_data init_data = {};
91 struct device *dev = &pdev->dev;
92 struct pm8058_led *led;
93 struct device_node *np;
94 int ret;
95 struct regmap *map;
96 enum led_brightness maxbright;
97 enum led_default_state state;
98
99 led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
100 if (!led)
101 return -ENOMEM;
102
103 led->ledtype = (u32)(unsigned long)of_device_get_match_data(dev);
104
105 map = dev_get_regmap(dev->parent, NULL);
106 if (!map) {
107 dev_err(dev, "Parent regmap unavailable.\n");
108 return -ENXIO;
109 }
110 led->map = map;
111
112 np = dev_of_node(dev);
113
114 ret = of_property_read_u32(np, "reg", &led->reg);
115 if (ret) {
116 dev_err(dev, "no register offset specified\n");
117 return -EINVAL;
118 }
119
120 led->cdev.brightness_set = pm8058_led_set;
121 led->cdev.brightness_get = pm8058_led_get;
122 if (led->ledtype == PM8058_LED_TYPE_COMMON)
123 maxbright = 31; /* 5 bits */
124 else
125 maxbright = 15; /* 4 bits */
126 led->cdev.max_brightness = maxbright;
127
128 init_data.fwnode = of_fwnode_handle(np);
129
130 state = led_init_default_state_get(init_data.fwnode);
131 switch (state) {
132 case LEDS_DEFSTATE_ON:
133 led->cdev.brightness = maxbright;
134 pm8058_led_set(&led->cdev, maxbright);
135 break;
136 case LEDS_DEFSTATE_KEEP:
137 led->cdev.brightness = pm8058_led_get(&led->cdev);
138 break;
139 default:
140 led->cdev.brightness = LED_OFF;
141 pm8058_led_set(&led->cdev, LED_OFF);
142 }
143
144 if (led->ledtype == PM8058_LED_TYPE_KEYPAD ||
145 led->ledtype == PM8058_LED_TYPE_FLASH)
146 led->cdev.flags = LED_CORE_SUSPENDRESUME;
147
148 ret = devm_led_classdev_register_ext(dev, &led->cdev, &init_data);
149 if (ret)
150 dev_err(dev, "Failed to register LED for %pOF\n", np);
151
152 return ret;
153}
154
155static const struct of_device_id pm8058_leds_id_table[] = {
156 {
157 .compatible = "qcom,pm8058-led",
158 .data = (void *)PM8058_LED_TYPE_COMMON
159 },
160 {
161 .compatible = "qcom,pm8058-keypad-led",
162 .data = (void *)PM8058_LED_TYPE_KEYPAD
163 },
164 {
165 .compatible = "qcom,pm8058-flash-led",
166 .data = (void *)PM8058_LED_TYPE_FLASH
167 },
168 { },
169};
170MODULE_DEVICE_TABLE(of, pm8058_leds_id_table);
171
172static struct platform_driver pm8058_led_driver = {
173 .probe = pm8058_led_probe,
174 .driver = {
175 .name = "pm8058-leds",
176 .of_match_table = pm8058_leds_id_table,
177 },
178};
179module_platform_driver(pm8058_led_driver);
180
181MODULE_DESCRIPTION("PM8058 LEDs driver");
182MODULE_LICENSE("GPL v2");
183MODULE_ALIAS("platform:pm8058-leds");