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
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
|
/*
* leds-max8997.c - LED class driver for MAX8997 LEDs.
*
* Copyright (C) 2011 Samsung Electronics
* Donggeun Kim <dg77.kim@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/module.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/leds.h>
#include <linux/mfd/max8997.h>
#include <linux/mfd/max8997-private.h>
#include <linux/platform_device.h>
#define MAX8997_LED_FLASH_SHIFT 3
#define MAX8997_LED_FLASH_CUR_MASK 0xf8
#define MAX8997_LED_MOVIE_SHIFT 4
#define MAX8997_LED_MOVIE_CUR_MASK 0xf0
#define MAX8997_LED_FLASH_MAX_BRIGHTNESS 0x1f
#define MAX8997_LED_MOVIE_MAX_BRIGHTNESS 0xf
#define MAX8997_LED_NONE_MAX_BRIGHTNESS 0
#define MAX8997_LED0_FLASH_MASK 0x1
#define MAX8997_LED0_FLASH_PIN_MASK 0x5
#define MAX8997_LED0_MOVIE_MASK 0x8
#define MAX8997_LED0_MOVIE_PIN_MASK 0x28
#define MAX8997_LED1_FLASH_MASK 0x2
#define MAX8997_LED1_FLASH_PIN_MASK 0x6
#define MAX8997_LED1_MOVIE_MASK 0x10
#define MAX8997_LED1_MOVIE_PIN_MASK 0x30
#define MAX8997_LED_BOOST_ENABLE_MASK (1 << 6)
struct max8997_led {
struct max8997_dev *iodev;
struct led_classdev cdev;
bool enabled;
int id;
enum max8997_led_mode led_mode;
struct mutex mutex;
};
static void max8997_led_set_mode(struct max8997_led *led,
enum max8997_led_mode mode)
{
int ret;
struct i2c_client *client = led->iodev->i2c;
u8 mask = 0, val;
switch (mode) {
case MAX8997_FLASH_MODE:
mask = MAX8997_LED1_FLASH_MASK | MAX8997_LED0_FLASH_MASK;
val = led->id ?
MAX8997_LED1_FLASH_MASK : MAX8997_LED0_FLASH_MASK;
led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS;
break;
case MAX8997_MOVIE_MODE:
mask = MAX8997_LED1_MOVIE_MASK | MAX8997_LED0_MOVIE_MASK;
val = led->id ?
MAX8997_LED1_MOVIE_MASK : MAX8997_LED0_MOVIE_MASK;
led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS;
break;
case MAX8997_FLASH_PIN_CONTROL_MODE:
mask = MAX8997_LED1_FLASH_PIN_MASK |
MAX8997_LED0_FLASH_PIN_MASK;
val = led->id ?
MAX8997_LED1_FLASH_PIN_MASK : MAX8997_LED0_FLASH_PIN_MASK;
led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS;
break;
case MAX8997_MOVIE_PIN_CONTROL_MODE:
mask = MAX8997_LED1_MOVIE_PIN_MASK |
MAX8997_LED0_MOVIE_PIN_MASK;
val = led->id ?
MAX8997_LED1_MOVIE_PIN_MASK : MAX8997_LED0_MOVIE_PIN_MASK;
led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS;
break;
default:
led->cdev.max_brightness = MAX8997_LED_NONE_MAX_BRIGHTNESS;
break;
}
if (mask) {
ret = max8997_update_reg(client, MAX8997_REG_LEN_CNTL, val,
mask);
if (ret)
dev_err(led->iodev->dev,
"failed to update register(%d)\n", ret);
}
led->led_mode = mode;
}
static void max8997_led_enable(struct max8997_led *led, bool enable)
{
int ret;
struct i2c_client *client = led->iodev->i2c;
u8 val = 0, mask = MAX8997_LED_BOOST_ENABLE_MASK;
if (led->enabled == enable)
return;
val = enable ? MAX8997_LED_BOOST_ENABLE_MASK : 0;
ret = max8997_update_reg(client, MAX8997_REG_BOOST_CNTL, val, mask);
if (ret)
dev_err(led->iodev->dev,
"failed to update register(%d)\n", ret);
led->enabled = enable;
}
static void max8997_led_set_current(struct max8997_led *led,
enum led_brightness value)
{
int ret;
struct i2c_client *client = led->iodev->i2c;
u8 val = 0, mask = 0, reg = 0;
switch (led->led_mode) {
case MAX8997_FLASH_MODE:
case MAX8997_FLASH_PIN_CONTROL_MODE:
val = value << MAX8997_LED_FLASH_SHIFT;
mask = MAX8997_LED_FLASH_CUR_MASK;
reg = led->id ? MAX8997_REG_FLASH2_CUR : MAX8997_REG_FLASH1_CUR;
break;
case MAX8997_MOVIE_MODE:
case MAX8997_MOVIE_PIN_CONTROL_MODE:
val = value << MAX8997_LED_MOVIE_SHIFT;
mask = MAX8997_LED_MOVIE_CUR_MASK;
reg = MAX8997_REG_MOVIE_CUR;
break;
default:
break;
}
if (mask) {
ret = max8997_update_reg(client, reg, val, mask);
if (ret)
dev_err(led->iodev->dev,
"failed to update register(%d)\n", ret);
}
}
static void max8997_led_brightness_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
struct max8997_led *led =
container_of(led_cdev, struct max8997_led, cdev);
if (value) {
max8997_led_set_current(led, value);
max8997_led_enable(led, true);
} else {
max8997_led_set_current(led, value);
max8997_led_enable(led, false);
}
}
static ssize_t max8997_led_show_mode(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct max8997_led *led =
container_of(led_cdev, struct max8997_led, cdev);
ssize_t ret = 0;
mutex_lock(&led->mutex);
switch (led->led_mode) {
case MAX8997_FLASH_MODE:
ret += sprintf(buf, "FLASH\n");
break;
case MAX8997_MOVIE_MODE:
ret += sprintf(buf, "MOVIE\n");
break;
case MAX8997_FLASH_PIN_CONTROL_MODE:
ret += sprintf(buf, "FLASH_PIN_CONTROL\n");
break;
case MAX8997_MOVIE_PIN_CONTROL_MODE:
ret += sprintf(buf, "MOVIE_PIN_CONTROL\n");
break;
default:
ret += sprintf(buf, "NONE\n");
break;
}
mutex_unlock(&led->mutex);
return ret;
}
static ssize_t max8997_led_store_mode(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct max8997_led *led =
container_of(led_cdev, struct max8997_led, cdev);
enum max8997_led_mode mode;
mutex_lock(&led->mutex);
if (!strncmp(buf, "FLASH_PIN_CONTROL", 17))
mode = MAX8997_FLASH_PIN_CONTROL_MODE;
else if (!strncmp(buf, "MOVIE_PIN_CONTROL", 17))
mode = MAX8997_MOVIE_PIN_CONTROL_MODE;
else if (!strncmp(buf, "FLASH", 5))
mode = MAX8997_FLASH_MODE;
else if (!strncmp(buf, "MOVIE", 5))
mode = MAX8997_MOVIE_MODE;
else
mode = MAX8997_NONE;
max8997_led_set_mode(led, mode);
mutex_unlock(&led->mutex);
return size;
}
static DEVICE_ATTR(mode, 0644, max8997_led_show_mode, max8997_led_store_mode);
static int __devinit max8997_led_probe(struct platform_device *pdev)
{
struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
struct max8997_led *led;
char name[20];
int ret = 0;
if (pdata == NULL) {
dev_err(&pdev->dev, "no platform data\n");
return -ENODEV;
}
led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
if (led == NULL)
return -ENOMEM;
led->id = pdev->id;
snprintf(name, sizeof(name), "max8997-led%d", pdev->id);
led->cdev.name = name;
led->cdev.brightness_set = max8997_led_brightness_set;
led->cdev.flags |= LED_CORE_SUSPENDRESUME;
led->cdev.brightness = 0;
led->iodev = iodev;
/* initialize mode and brightness according to platform_data */
if (pdata->led_pdata) {
u8 mode = 0, brightness = 0;
mode = pdata->led_pdata->mode[led->id];
brightness = pdata->led_pdata->brightness[led->id];
max8997_led_set_mode(led, pdata->led_pdata->mode[led->id]);
if (brightness > led->cdev.max_brightness)
brightness = led->cdev.max_brightness;
max8997_led_set_current(led, brightness);
led->cdev.brightness = brightness;
} else {
max8997_led_set_mode(led, MAX8997_NONE);
max8997_led_set_current(led, 0);
}
mutex_init(&led->mutex);
platform_set_drvdata(pdev, led);
ret = led_classdev_register(&pdev->dev, &led->cdev);
if (ret < 0)
return ret;
ret = device_create_file(led->cdev.dev, &dev_attr_mode);
if (ret != 0) {
dev_err(&pdev->dev,
"failed to create file: %d\n", ret);
led_classdev_unregister(&led->cdev);
return ret;
}
return 0;
}
static int __devexit max8997_led_remove(struct platform_device *pdev)
{
struct max8997_led *led = platform_get_drvdata(pdev);
device_remove_file(led->cdev.dev, &dev_attr_mode);
led_classdev_unregister(&led->cdev);
return 0;
}
static struct platform_driver max8997_led_driver = {
.driver = {
.name = "max8997-led",
.owner = THIS_MODULE,
},
.probe = max8997_led_probe,
.remove = max8997_led_remove,
};
module_platform_driver(max8997_led_driver);
MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
MODULE_DESCRIPTION("MAX8997 LED driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:max8997-led");
|
