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
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
/*
* LED Driver for Dialog DA9052 PMICs.
*
* Copyright(c) 2012 Dialog Semiconductor Ltd.
*
* Author: David Dajun Chen <dchen@diasemi.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <linux/workqueue.h>
#include <linux/slab.h>
#include <linux/mfd/da9052/reg.h>
#include <linux/mfd/da9052/da9052.h>
#include <linux/mfd/da9052/pdata.h>
#define DA9052_OPENDRAIN_OUTPUT 2
#define DA9052_SET_HIGH_LVL_OUTPUT (1 << 3)
#define DA9052_MASK_UPPER_NIBBLE 0xF0
#define DA9052_MASK_LOWER_NIBBLE 0x0F
#define DA9052_NIBBLE_SHIFT 4
#define DA9052_MAX_BRIGHTNESS 0x5f
struct da9052_led {
struct led_classdev cdev;
struct work_struct work;
struct da9052 *da9052;
unsigned char led_index;
unsigned char id;
int brightness;
};
static unsigned char led_reg[] = {
DA9052_LED_CONT_4_REG,
DA9052_LED_CONT_5_REG,
};
static int da9052_set_led_brightness(struct da9052_led *led)
{
u8 val;
int error;
val = (led->brightness & 0x7f) | DA9052_LED_CONT_DIM;
error = da9052_reg_write(led->da9052, led_reg[led->led_index], val);
if (error < 0)
dev_err(led->da9052->dev, "Failed to set led brightness, %d\n",
error);
return error;
}
static void da9052_led_work(struct work_struct *work)
{
struct da9052_led *led = container_of(work, struct da9052_led, work);
da9052_set_led_brightness(led);
}
static void da9052_led_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
struct da9052_led *led;
led = container_of(led_cdev, struct da9052_led, cdev);
led->brightness = value;
schedule_work(&led->work);
}
static int da9052_configure_leds(struct da9052 *da9052)
{
int error;
unsigned char register_value = DA9052_OPENDRAIN_OUTPUT
| DA9052_SET_HIGH_LVL_OUTPUT;
error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
DA9052_MASK_LOWER_NIBBLE,
register_value);
if (error < 0) {
dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
error);
return error;
}
error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
DA9052_MASK_UPPER_NIBBLE,
register_value << DA9052_NIBBLE_SHIFT);
if (error < 0)
dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
error);
return error;
}
static int da9052_led_probe(struct platform_device *pdev)
{
struct da9052_pdata *pdata;
struct da9052 *da9052;
struct led_platform_data *pled;
struct da9052_led *led = NULL;
int error = -ENODEV;
int i;
da9052 = dev_get_drvdata(pdev->dev.parent);
pdata = dev_get_platdata(da9052->dev);
if (pdata == NULL) {
dev_err(&pdev->dev, "No platform data\n");
goto err;
}
pled = pdata->pled;
if (pled == NULL) {
dev_err(&pdev->dev, "No platform data for LED\n");
goto err;
}
led = devm_kzalloc(&pdev->dev,
sizeof(struct da9052_led) * pled->num_leds,
GFP_KERNEL);
if (led == NULL) {
dev_err(&pdev->dev, "Failed to alloc memory\n");
error = -ENOMEM;
goto err;
}
for (i = 0; i < pled->num_leds; i++) {
led[i].cdev.name = pled->leds[i].name;
led[i].cdev.brightness_set = da9052_led_set;
led[i].cdev.brightness = LED_OFF;
led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS;
led[i].brightness = LED_OFF;
led[i].led_index = pled->leds[i].flags;
led[i].da9052 = dev_get_drvdata(pdev->dev.parent);
INIT_WORK(&led[i].work, da9052_led_work);
error = led_classdev_register(pdev->dev.parent, &led[i].cdev);
if (error) {
dev_err(&pdev->dev, "Failed to register led %d\n",
led[i].led_index);
goto err_register;
}
error = da9052_set_led_brightness(&led[i]);
if (error) {
dev_err(&pdev->dev, "Unable to init led %d\n",
led[i].led_index);
continue;
}
}
error = da9052_configure_leds(led->da9052);
if (error) {
dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error);
goto err_register;
}
platform_set_drvdata(pdev, led);
return 0;
err_register:
for (i = i - 1; i >= 0; i--) {
led_classdev_unregister(&led[i].cdev);
cancel_work_sync(&led[i].work);
}
err:
return error;
}
static int da9052_led_remove(struct platform_device *pdev)
{
struct da9052_led *led = platform_get_drvdata(pdev);
struct da9052_pdata *pdata;
struct da9052 *da9052;
struct led_platform_data *pled;
int i;
da9052 = dev_get_drvdata(pdev->dev.parent);
pdata = dev_get_platdata(da9052->dev);
pled = pdata->pled;
for (i = 0; i < pled->num_leds; i++) {
led[i].brightness = 0;
da9052_set_led_brightness(&led[i]);
led_classdev_unregister(&led[i].cdev);
cancel_work_sync(&led[i].work);
}
return 0;
}
static struct platform_driver da9052_led_driver = {
.driver = {
.name = "da9052-leds",
.owner = THIS_MODULE,
},
.probe = da9052_led_probe,
.remove = da9052_led_remove,
};
module_platform_driver(da9052_led_driver);
MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>");
MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC");
MODULE_LICENSE("GPL");
|
