1
2
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 pm8058_led *led;
91 struct device_node *np = pdev->dev.of_node;
92 int ret;
93 struct regmap *map;
94 const char *state;
95 enum led_brightness maxbright;
96
97 led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
98 if (!led)
99 return -ENOMEM;
100
101 led->ledtype = (u32)(unsigned long)of_device_get_match_data(&pdev->dev);
102
103 map = dev_get_regmap(pdev->dev.parent, NULL);
104 if (!map) {
105 dev_err(&pdev->dev, "Parent regmap unavailable.\n");
106 return -ENXIO;
107 }
108 led->map = map;
109
110 ret = of_property_read_u32(np, "reg", &led->reg);
111 if (ret) {
112 dev_err(&pdev->dev, "no register offset specified\n");
113 return -EINVAL;
114 }
115
116
117 led->cdev.name = of_get_property(np, "label", NULL) ? : np->name;
118 led->cdev.default_trigger =
119 of_get_property(np, "linux,default-trigger", NULL);
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;
124 else
125 maxbright = 15;
126 led->cdev.max_brightness = maxbright;
127
128 state = of_get_property(np, "default-state", NULL);
129 if (state) {
130 if (!strcmp(state, "keep")) {
131 led->cdev.brightness = pm8058_led_get(&led->cdev);
132 } else if (!strcmp(state, "on")) {
133 led->cdev.brightness = maxbright;
134 pm8058_led_set(&led->cdev, maxbright);
135 } else {
136 led->cdev.brightness = LED_OFF;
137 pm8058_led_set(&led->cdev, LED_OFF);
138 }
139 }
140
141 if (led->ledtype == PM8058_LED_TYPE_KEYPAD ||
142 led->ledtype == PM8058_LED_TYPE_FLASH)
143 led->cdev.flags = LED_CORE_SUSPENDRESUME;
144
145 ret = devm_led_classdev_register(&pdev->dev, &led->cdev);
146 if (ret) {
147 dev_err(&pdev->dev, "unable to register led \"%s\"\n",
148 led->cdev.name);
149 return ret;
150 }
151
152 return 0;
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");
184
