summaryrefslogtreecommitdiffstats
path: root/drivers/leds/leds-pm8058.c
blob: a52674327857bcbf01a7a1c9437e0e6878f73f5a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
/* Copyright (c) 2010, 2011, 2016 The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/regmap.h>

#define PM8058_LED_TYPE_COMMON	0x00
#define PM8058_LED_TYPE_KEYPAD	0x01
#define PM8058_LED_TYPE_FLASH	0x02

#define PM8058_LED_TYPE_COMMON_MASK	0xf8
#define PM8058_LED_TYPE_KEYPAD_MASK	0xf0
#define PM8058_LED_TYPE_COMMON_SHIFT	3
#define PM8058_LED_TYPE_KEYPAD_SHIFT	4

struct pm8058_led {
	struct regmap *map;
	u32 reg;
	u32 ledtype;
	struct led_classdev cdev;
};

static void pm8058_led_set(struct led_classdev *cled,
	enum led_brightness value)
{
	struct pm8058_led *led;
	int ret = 0;
	unsigned int mask = 0;
	unsigned int val = 0;

	led = container_of(cled, struct pm8058_led, cdev);
	switch (led->ledtype) {
	case PM8058_LED_TYPE_COMMON:
		mask = PM8058_LED_TYPE_COMMON_MASK;
		val = value << PM8058_LED_TYPE_COMMON_SHIFT;
		break;
	case PM8058_LED_TYPE_KEYPAD:
	case PM8058_LED_TYPE_FLASH:
		mask = PM8058_LED_TYPE_KEYPAD_MASK;
		val = value << PM8058_LED_TYPE_KEYPAD_SHIFT;
		break;
	default:
		break;
	}

	ret = regmap_update_bits(led->map, led->reg, mask, val);
	if (ret)
		pr_err("Failed to set LED brightness\n");
}

static enum led_brightness pm8058_led_get(struct led_classdev *cled)
{
	struct pm8058_led *led;
	int ret;
	unsigned int val;

	led = container_of(cled, struct pm8058_led, cdev);

	ret = regmap_read(led->map, led->reg, &val);
	if (ret) {
		pr_err("Failed to get LED brightness\n");
		return LED_OFF;
	}

	switch (led->ledtype) {
	case PM8058_LED_TYPE_COMMON:
		val &= PM8058_LED_TYPE_COMMON_MASK;
		val >>= PM8058_LED_TYPE_COMMON_SHIFT;
		break;
	case PM8058_LED_TYPE_KEYPAD:
	case PM8058_LED_TYPE_FLASH:
		val &= PM8058_LED_TYPE_KEYPAD_MASK;
		val >>= PM8058_LED_TYPE_KEYPAD_SHIFT;
		break;
	default:
		val = LED_OFF;
		break;
	}

	return val;
}

static int pm8058_led_probe(struct platform_device *pdev)
{
	struct pm8058_led *led;
	struct device_node *np = pdev->dev.of_node;
	int ret;
	struct regmap *map;
	const char *state;
	enum led_brightness maxbright;

	led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
	if (!led)
		return -ENOMEM;

	led->ledtype = (u32)of_device_get_match_data(&pdev->dev);

	map = dev_get_regmap(pdev->dev.parent, NULL);
	if (!map) {
		dev_err(&pdev->dev, "Parent regmap unavailable.\n");
		return -ENXIO;
	}
	led->map = map;

	ret = of_property_read_u32(np, "reg", &led->reg);
	if (ret) {
		dev_err(&pdev->dev, "no register offset specified\n");
		return -EINVAL;
	}

	/* Use label else node name */
	led->cdev.name = of_get_property(np, "label", NULL) ? : np->name;
	led->cdev.default_trigger =
		of_get_property(np, "linux,default-trigger", NULL);
	led->cdev.brightness_set = pm8058_led_set;
	led->cdev.brightness_get = pm8058_led_get;
	if (led->ledtype == PM8058_LED_TYPE_COMMON)
		maxbright = 31; /* 5 bits */
	else
		maxbright = 15; /* 4 bits */
	led->cdev.max_brightness = maxbright;

	state = of_get_property(np, "default-state", NULL);
	if (state) {
		if (!strcmp(state, "keep")) {
			led->cdev.brightness = pm8058_led_get(&led->cdev);
		} else if (!strcmp(state, "on")) {
			led->cdev.brightness = maxbright;
			pm8058_led_set(&led->cdev, maxbright);
		} else {
			led->cdev.brightness = LED_OFF;
			pm8058_led_set(&led->cdev, LED_OFF);
		}
	}

	if (led->ledtype == PM8058_LED_TYPE_KEYPAD ||
	    led->ledtype == PM8058_LED_TYPE_FLASH)
		led->cdev.flags	= LED_CORE_SUSPENDRESUME;

	ret = devm_led_classdev_register(&pdev->dev, &led->cdev);
	if (ret) {
		dev_err(&pdev->dev, "unable to register led \"%s\"\n",
			led->cdev.name);
		return ret;
	}

	return 0;
}

static const struct of_device_id pm8058_leds_id_table[] = {
	{
		.compatible = "qcom,pm8058-led",
		.data = (void *)PM8058_LED_TYPE_COMMON
	},
	{
		.compatible = "qcom,pm8058-keypad-led",
		.data = (void *)PM8058_LED_TYPE_KEYPAD
	},
	{
		.compatible = "qcom,pm8058-flash-led",
		.data = (void *)PM8058_LED_TYPE_FLASH
	},
	{ },
};
MODULE_DEVICE_TABLE(of, pm8058_leds_id_table);

static struct platform_driver pm8058_led_driver = {
	.probe		= pm8058_led_probe,
	.driver		= {
		.name	= "pm8058-leds",
		.of_match_table = pm8058_leds_id_table,
	},
};
module_platform_driver(pm8058_led_driver);

MODULE_DESCRIPTION("PM8058 LEDs driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:pm8058-leds");
OpenPOWER on IntegriCloud