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
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
|
/*
* Copyright (C) 2012 Spreadtrum Communications Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <soc/sprd/adi.h>
#include <soc/sprd/adc.h>
#include <soc/sprd/sci_glb_regs.h>
#ifdef CONFIG_HAS_EARLYSUSPEND
#include <linux/earlysuspend.h>
#endif
#include <linux/of.h>
#include <linux/leds-sprd-kpled-2723.h>
//#define SPRD_KPLED_DBG
#ifdef SPRD_KPLED_DBG
#define ENTER printk(KERN_INFO "[SPRD_KPLED_DBG] func: %s line: %04d\n", __func__, __LINE__);
#define PRINT_DBG(x...) printk(KERN_INFO "[SPRD_KPLED_DBG] " x)
#define PRINT_INFO(x...) printk(KERN_INFO "[SPRD_KPLED_INFO] " x)
#define PRINT_WARN(x...) printk(KERN_INFO "[SPRD_KPLED_WARN] " x)
#define PRINT_ERR(format,x...) printk(KERN_ERR "[SPRD_KPLED_ERR] func: %s line: %04d info: " format, __func__, __LINE__, ## x)
#else
#define ENTER
#define PRINT_DBG(x...)
#define PRINT_INFO(x...) printk(KERN_INFO "[SPRD_KPLED_INFO] " x)
#define PRINT_WARN(x...) printk(KERN_INFO "[SPRD_KPLED_WARN] " x)
#define PRINT_ERR(format,x...) printk(KERN_ERR "[SPRD_KPLED_ERR] func: %s line: %04d info: " format, __func__, __LINE__, ## x)
#endif
#if 0
#define SPRD_ANA_BASE (SPRD_MISC_BASE + 0x8800)
#define ANA_REG_BASE SPRD_ANA_BASE
#define ANA_LED_CTRL (ANA_REG_BASE + 0xF4)
#endif
#define KPLED_CTL (ANA_REGS_GLB_BASE + 0xf4)
#define KPLED_V_SHIFT 12
#define KPLED_V_MSK (0x0F << KPLED_V_SHIFT)
#define LDO_KPLED_PD (1 << 8)
#define LDO_KPLED_V_SHIFT (0x00)
#define LDO_KPLED_V_MSK (0xff)
#define KPLED_PD (1 << 11)
#define KPLED_PULLDOWN_EN (1 << 10)
/* sprd keypad backlight */
struct sprd_kpled {
struct platform_device *dev;
struct mutex mutex;
struct work_struct work;
spinlock_t value_lock;
enum led_brightness value;
struct led_classdev cdev;
int enabled;
int brightness_max;
int brightness_min;
int run_mode;
#ifdef CONFIG_HAS_EARLYSUSPEND
struct early_suspend early_suspend;
#endif
};
#define to_sprd_led(led_cdev) \
container_of(led_cdev, struct sprd_kpled, cdev)
static inline uint32_t kpled_read(uint32_t reg)
{
return sci_adi_read(reg);
}
static void sprd_kpled_set_brightness(struct sprd_kpled *led)
{
unsigned long brightness = led->value;
unsigned long brightness_level;
brightness_level = brightness;
PRINT_INFO("sprd_kpled_set_brightness:led->run_mode = %d\n",led->run_mode);
if(brightness_level > 255)
brightness_level = 255;
/*brightness steps = 16*/
if(led->run_mode == 1){
sci_adi_write(KPLED_CTL, ((brightness_level << KPLED_V_SHIFT) & KPLED_V_MSK), KPLED_V_MSK);
}
else
sci_adi_write(KPLED_CTL, ((brightness_level << LDO_KPLED_V_SHIFT) & LDO_KPLED_V_MSK), LDO_KPLED_V_MSK);
PRINT_INFO("reg:0x%08X set_val:0x%08X brightness:%ld brightness_level:%ld(0~15)\n", \
KPLED_CTL, kpled_read(KPLED_CTL), brightness, brightness_level);
}
static void sprd_kpled_enable(struct sprd_kpled *led)
{
if(led->run_mode == 1){
sci_adi_clr(KPLED_CTL, KPLED_PD);
}
else{
sci_adi_set(KPLED_CTL, KPLED_PULLDOWN_EN);
sci_adi_clr(KPLED_CTL, LDO_KPLED_PD);
}
PRINT_INFO("sprd_kpled_enable\n");
sprd_kpled_set_brightness(led);
led->enabled = 1;
}
static void sprd_kpled_disable(struct sprd_kpled *led)
{
if(led->run_mode == 1){
sci_adi_set(KPLED_CTL, KPLED_PD);
}
else{
sci_adi_set(KPLED_CTL, KPLED_PULLDOWN_EN);
sci_adi_set(KPLED_CTL, LDO_KPLED_PD);
}
PRINT_INFO("sprd_kpled_disable\n");
led->enabled = 0;
}
static void sprd_kpled_work(struct work_struct *work)
{
struct sprd_kpled *led = container_of(work, struct sprd_kpled, work);
unsigned long flags;
mutex_lock(&led->mutex);
spin_lock_irqsave(&led->value_lock, flags);
if (led->value == LED_OFF) {
spin_unlock_irqrestore(&led->value_lock, flags);
sprd_kpled_disable(led);
goto out;
}
spin_unlock_irqrestore(&led->value_lock, flags);
sprd_kpled_enable(led);
out:
mutex_unlock(&led->mutex);
}
static void sprd_kpled_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
struct sprd_kpled *led = to_sprd_led(led_cdev);
unsigned long flags;
PRINT_INFO("sprd_kpled_set!\n");
spin_lock_irqsave(&led->value_lock, flags);
led->value = value;
spin_unlock_irqrestore(&led->value_lock, flags);
schedule_work(&led->work);
}
static void sprd_kpled_shutdown(struct platform_device *dev)
{
struct sprd_kpled *led = platform_get_drvdata(dev);
mutex_lock(&led->mutex);
sprd_kpled_disable(led);
mutex_unlock(&led->mutex);
}
#ifdef CONFIG_EARLYSUSPEND
static void sprd_kpled_early_suspend(struct early_suspend *es)
{
struct sprd_kpled *led = container_of(es, struct sprd_kpled, early_suspend);
PRINT_INFO("sprd_kpled_early_suspend\n");
}
static void sprd_kpled_late_resume(struct early_suspend *es)
{
struct sprd_kpled *led = container_of(es, struct sprd_kpled, early_suspend);
PRINT_INFO("sprd_kpled_late_resume\n");
}
#endif
#ifdef CONFIG_OF
static struct sprd_kpled_2723_platform_data *sprd_kpled_2723_parse_dt(struct platform_device *pdev)
{
int ret;
struct device_node *np = pdev->dev.of_node;
struct sprd_kpled_2723_platform_data *pdata = NULL;
pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
if (!pdata) {
dev_err(pdev, "sprd_kpled Could not allocate pdata");
return NULL;
}
ret = of_property_read_u32(np, "brightness_max", &pdata->brightness_max);
if(ret){
dev_err(pdev, "fail to get pdata->brightness_max\n");
goto fail;
}
ret = of_property_read_u32(np, "brightness_min", &pdata->brightness_min);
if(ret){
dev_err(pdev, "fail to get pdata->brightness_min\n");
goto fail;
}
ret = of_property_read_u32(np, "run_mode", &pdata->run_mode);
if(ret){
dev_err(pdev, "fail to get pdata->run_mode\n");
goto fail;
}
return pdata;
fail:
kfree(pdata);
return NULL;
}
#endif
static int sprd_kpled_probe(struct platform_device *dev)
{
struct sprd_kpled *led;
int ret;
struct sprd_kpled_2723_platform_data *pdata = NULL;
#ifdef CONFIG_OF
struct device_node *np = dev->dev.of_node;
if(np) {
pdata = sprd_kpled_2723_parse_dt(dev);
if (pdata == NULL) {
PRINT_ERR("get dts data failed!\n");
return -ENODEV;
}
} else {
PRINT_ERR("dev.of_node is NULL!\n");
return -ENODEV;
}
#else
pdata = dev->dev.platform_data;
if (!pdata){
PRINT_ERR("No kpled_platform data!\n");
return -ENODEV;
}
#endif
led = kzalloc(sizeof(struct sprd_kpled), GFP_KERNEL);
if (led == NULL) {
dev_err(&dev->dev, "No memory for device\n");
return -ENOMEM;
}
led->cdev.brightness_set = sprd_kpled_set;
//led->cdev.default_trigger = "heartbeat";
led->cdev.default_trigger = "none";
led->cdev.name = "keyboard-backlight";
led->cdev.brightness_get = NULL;
led->cdev.flags |= LED_CORE_SUSPENDRESUME;
led->enabled = 0;
led->brightness_max = pdata->brightness_max;
led->brightness_min = pdata->brightness_min;
led->run_mode = pdata->run_mode;
PRINT_INFO("led->run_mode = %d\n",led->run_mode);
PRINT_INFO("led->brightness_max = %d\n",led->brightness_max);
spin_lock_init(&led->value_lock);
mutex_init(&led->mutex);
INIT_WORK(&led->work, sprd_kpled_work);
led->value = LED_OFF;
platform_set_drvdata(dev, led);
/* register our new led device */
ret = led_classdev_register(&dev->dev, &led->cdev);
if (ret < 0) {
dev_err(&dev->dev, "led_classdev_register failed\n");
kfree(led);
return ret;
}
#ifdef CONFIG_HAS_EARLYSUSPEND
led->early_suspend.suspend = sprd_kpled_early_suspend;
led->early_suspend.resume = sprd_kpled_late_resume;
led->early_suspend.level = EARLY_SUSPEND_LEVEL_BLANK_SCREEN;
register_early_suspend(&led->early_suspend);
#endif
sprd_kpled_disable(led);//disabled by default
return 0;
}
static int sprd_kpled_remove(struct platform_device *dev)
{
struct sprd_kpled *led = platform_get_drvdata(dev);
led_classdev_unregister(&led->cdev);
flush_scheduled_work();
led->value = LED_OFF;
led->enabled = 1;
sprd_kpled_disable(led);
kfree(led);
return 0;
}
static const struct of_device_id kpled_2723_of_match[] = {
{ .compatible = "sprd,sprd-kpled-2723", },
{ }
};
static struct platform_driver sprd_kpled_2723_driver = {
.driver = {
.name = "sprd-kpled-2723",
.owner = THIS_MODULE,
.of_match_table = kpled_2723_of_match,
},
.probe = sprd_kpled_probe,
.remove = sprd_kpled_remove,
.shutdown = sprd_kpled_shutdown,
};
static int __init sprd_kpled_2723_init(void)
{
PRINT_INFO("Locate in sprd_kpled_2723_init!\n");
return platform_driver_register(&sprd_kpled_2723_driver);
}
static void sprd_kpled_2723_exit(void)
{
platform_driver_unregister(&sprd_kpled_2723_driver);
}
module_init(sprd_kpled_2723_init);
module_exit(sprd_kpled_2723_exit);
MODULE_AUTHOR("ya huang <ya.huang@spreadtrum.com>");
MODULE_DESCRIPTION("Sprd Keyboard backlight driver for 2723s");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:sprd_kpled_2723");
|
