1 /*
2 * Backlight driver for Analog Devices ADP5520/ADP5501 MFD PMICs
3 *
4 * Copyright 2009 Analog Devices Inc.
5 *
6 * Licensed under the GPL-2 or later.
7 */
8
9 #include <linux/kernel.h>
10 #include <linux/init.h>
11 #include <linux/platform_device.h>
12 #include <linux/fb.h>
13 #include <linux/backlight.h>
14 #include <linux/mfd/adp5520.h>
15 #include <linux/slab.h>
16 #include <linux/module.h>
17
18 struct adp5520_bl {
19 struct device *master;
20 struct adp5520_backlight_platform_data *pdata;
21 struct mutex lock;
22 unsigned long cached_daylight_max;
23 int id;
24 int current_brightness;
25 };
26
adp5520_bl_set(struct backlight_device * bl,int brightness)27 static int adp5520_bl_set(struct backlight_device *bl, int brightness)
28 {
29 struct adp5520_bl *data = bl_get_data(bl);
30 struct device *master = data->master;
31 int ret = 0;
32
33 if (data->pdata->en_ambl_sens) {
34 if ((brightness > 0) && (brightness < ADP5020_MAX_BRIGHTNESS)) {
35 /* Disable Ambient Light auto adjust */
36 ret |= adp5520_clr_bits(master, ADP5520_BL_CONTROL,
37 ADP5520_BL_AUTO_ADJ);
38 ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX,
39 brightness);
40 } else {
41 /*
42 * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust
43 * restore daylight l3 sysfs brightness
44 */
45 ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX,
46 data->cached_daylight_max);
47 ret |= adp5520_set_bits(master, ADP5520_BL_CONTROL,
48 ADP5520_BL_AUTO_ADJ);
49 }
50 } else {
51 ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX, brightness);
52 }
53
54 if (data->current_brightness && brightness == 0)
55 ret |= adp5520_set_bits(master,
56 ADP5520_MODE_STATUS, ADP5520_DIM_EN);
57 else if (data->current_brightness == 0 && brightness)
58 ret |= adp5520_clr_bits(master,
59 ADP5520_MODE_STATUS, ADP5520_DIM_EN);
60
61 if (!ret)
62 data->current_brightness = brightness;
63
64 return ret;
65 }
66
adp5520_bl_update_status(struct backlight_device * bl)67 static int adp5520_bl_update_status(struct backlight_device *bl)
68 {
69 int brightness = bl->props.brightness;
70
71 if (bl->props.power != FB_BLANK_UNBLANK)
72 brightness = 0;
73
74 if (bl->props.fb_blank != FB_BLANK_UNBLANK)
75 brightness = 0;
76
77 return adp5520_bl_set(bl, brightness);
78 }
79
adp5520_bl_get_brightness(struct backlight_device * bl)80 static int adp5520_bl_get_brightness(struct backlight_device *bl)
81 {
82 struct adp5520_bl *data = bl_get_data(bl);
83 int error;
84 uint8_t reg_val;
85
86 error = adp5520_read(data->master, ADP5520_BL_VALUE, ®_val);
87
88 return error ? data->current_brightness : reg_val;
89 }
90
91 static const struct backlight_ops adp5520_bl_ops = {
92 .update_status = adp5520_bl_update_status,
93 .get_brightness = adp5520_bl_get_brightness,
94 };
95
adp5520_bl_setup(struct backlight_device * bl)96 static int adp5520_bl_setup(struct backlight_device *bl)
97 {
98 struct adp5520_bl *data = bl_get_data(bl);
99 struct device *master = data->master;
100 struct adp5520_backlight_platform_data *pdata = data->pdata;
101 int ret = 0;
102
103 ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX,
104 pdata->l1_daylight_max);
105 ret |= adp5520_write(master, ADP5520_DAYLIGHT_DIM,
106 pdata->l1_daylight_dim);
107
108 if (pdata->en_ambl_sens) {
109 data->cached_daylight_max = pdata->l1_daylight_max;
110 ret |= adp5520_write(master, ADP5520_OFFICE_MAX,
111 pdata->l2_office_max);
112 ret |= adp5520_write(master, ADP5520_OFFICE_DIM,
113 pdata->l2_office_dim);
114 ret |= adp5520_write(master, ADP5520_DARK_MAX,
115 pdata->l3_dark_max);
116 ret |= adp5520_write(master, ADP5520_DARK_DIM,
117 pdata->l3_dark_dim);
118 ret |= adp5520_write(master, ADP5520_L2_TRIP,
119 pdata->l2_trip);
120 ret |= adp5520_write(master, ADP5520_L2_HYS,
121 pdata->l2_hyst);
122 ret |= adp5520_write(master, ADP5520_L3_TRIP,
123 pdata->l3_trip);
124 ret |= adp5520_write(master, ADP5520_L3_HYS,
125 pdata->l3_hyst);
126 ret |= adp5520_write(master, ADP5520_ALS_CMPR_CFG,
127 ALS_CMPR_CFG_VAL(pdata->abml_filt,
128 ADP5520_L3_EN));
129 }
130
131 ret |= adp5520_write(master, ADP5520_BL_CONTROL,
132 BL_CTRL_VAL(pdata->fade_led_law,
133 pdata->en_ambl_sens));
134
135 ret |= adp5520_write(master, ADP5520_BL_FADE, FADE_VAL(pdata->fade_in,
136 pdata->fade_out));
137
138 ret |= adp5520_set_bits(master, ADP5520_MODE_STATUS,
139 ADP5520_BL_EN | ADP5520_DIM_EN);
140
141 return ret;
142 }
143
adp5520_show(struct device * dev,char * buf,int reg)144 static ssize_t adp5520_show(struct device *dev, char *buf, int reg)
145 {
146 struct adp5520_bl *data = dev_get_drvdata(dev);
147 int ret;
148 uint8_t reg_val;
149
150 mutex_lock(&data->lock);
151 ret = adp5520_read(data->master, reg, ®_val);
152 mutex_unlock(&data->lock);
153
154 if (ret < 0)
155 return ret;
156
157 return sprintf(buf, "%u\n", reg_val);
158 }
159
adp5520_store(struct device * dev,const char * buf,size_t count,int reg)160 static ssize_t adp5520_store(struct device *dev, const char *buf,
161 size_t count, int reg)
162 {
163 struct adp5520_bl *data = dev_get_drvdata(dev);
164 unsigned long val;
165 int ret;
166
167 ret = kstrtoul(buf, 10, &val);
168 if (ret)
169 return ret;
170
171 mutex_lock(&data->lock);
172 adp5520_write(data->master, reg, val);
173 mutex_unlock(&data->lock);
174
175 return count;
176 }
177
adp5520_bl_dark_max_show(struct device * dev,struct device_attribute * attr,char * buf)178 static ssize_t adp5520_bl_dark_max_show(struct device *dev,
179 struct device_attribute *attr, char *buf)
180 {
181 return adp5520_show(dev, buf, ADP5520_DARK_MAX);
182 }
183
adp5520_bl_dark_max_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)184 static ssize_t adp5520_bl_dark_max_store(struct device *dev,
185 struct device_attribute *attr,
186 const char *buf, size_t count)
187 {
188 return adp5520_store(dev, buf, count, ADP5520_DARK_MAX);
189 }
190 static DEVICE_ATTR(dark_max, 0664, adp5520_bl_dark_max_show,
191 adp5520_bl_dark_max_store);
192
adp5520_bl_office_max_show(struct device * dev,struct device_attribute * attr,char * buf)193 static ssize_t adp5520_bl_office_max_show(struct device *dev,
194 struct device_attribute *attr, char *buf)
195 {
196 return adp5520_show(dev, buf, ADP5520_OFFICE_MAX);
197 }
198
adp5520_bl_office_max_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)199 static ssize_t adp5520_bl_office_max_store(struct device *dev,
200 struct device_attribute *attr,
201 const char *buf, size_t count)
202 {
203 return adp5520_store(dev, buf, count, ADP5520_OFFICE_MAX);
204 }
205 static DEVICE_ATTR(office_max, 0664, adp5520_bl_office_max_show,
206 adp5520_bl_office_max_store);
207
adp5520_bl_daylight_max_show(struct device * dev,struct device_attribute * attr,char * buf)208 static ssize_t adp5520_bl_daylight_max_show(struct device *dev,
209 struct device_attribute *attr, char *buf)
210 {
211 return adp5520_show(dev, buf, ADP5520_DAYLIGHT_MAX);
212 }
213
adp5520_bl_daylight_max_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)214 static ssize_t adp5520_bl_daylight_max_store(struct device *dev,
215 struct device_attribute *attr,
216 const char *buf, size_t count)
217 {
218 struct adp5520_bl *data = dev_get_drvdata(dev);
219 int ret;
220
221 ret = kstrtoul(buf, 10, &data->cached_daylight_max);
222 if (ret < 0)
223 return ret;
224
225 return adp5520_store(dev, buf, count, ADP5520_DAYLIGHT_MAX);
226 }
227 static DEVICE_ATTR(daylight_max, 0664, adp5520_bl_daylight_max_show,
228 adp5520_bl_daylight_max_store);
229
adp5520_bl_dark_dim_show(struct device * dev,struct device_attribute * attr,char * buf)230 static ssize_t adp5520_bl_dark_dim_show(struct device *dev,
231 struct device_attribute *attr, char *buf)
232 {
233 return adp5520_show(dev, buf, ADP5520_DARK_DIM);
234 }
235
adp5520_bl_dark_dim_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)236 static ssize_t adp5520_bl_dark_dim_store(struct device *dev,
237 struct device_attribute *attr,
238 const char *buf, size_t count)
239 {
240 return adp5520_store(dev, buf, count, ADP5520_DARK_DIM);
241 }
242 static DEVICE_ATTR(dark_dim, 0664, adp5520_bl_dark_dim_show,
243 adp5520_bl_dark_dim_store);
244
adp5520_bl_office_dim_show(struct device * dev,struct device_attribute * attr,char * buf)245 static ssize_t adp5520_bl_office_dim_show(struct device *dev,
246 struct device_attribute *attr, char *buf)
247 {
248 return adp5520_show(dev, buf, ADP5520_OFFICE_DIM);
249 }
250
adp5520_bl_office_dim_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)251 static ssize_t adp5520_bl_office_dim_store(struct device *dev,
252 struct device_attribute *attr,
253 const char *buf, size_t count)
254 {
255 return adp5520_store(dev, buf, count, ADP5520_OFFICE_DIM);
256 }
257 static DEVICE_ATTR(office_dim, 0664, adp5520_bl_office_dim_show,
258 adp5520_bl_office_dim_store);
259
adp5520_bl_daylight_dim_show(struct device * dev,struct device_attribute * attr,char * buf)260 static ssize_t adp5520_bl_daylight_dim_show(struct device *dev,
261 struct device_attribute *attr, char *buf)
262 {
263 return adp5520_show(dev, buf, ADP5520_DAYLIGHT_DIM);
264 }
265
adp5520_bl_daylight_dim_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)266 static ssize_t adp5520_bl_daylight_dim_store(struct device *dev,
267 struct device_attribute *attr,
268 const char *buf, size_t count)
269 {
270 return adp5520_store(dev, buf, count, ADP5520_DAYLIGHT_DIM);
271 }
272 static DEVICE_ATTR(daylight_dim, 0664, adp5520_bl_daylight_dim_show,
273 adp5520_bl_daylight_dim_store);
274
275 static struct attribute *adp5520_bl_attributes[] = {
276 &dev_attr_dark_max.attr,
277 &dev_attr_dark_dim.attr,
278 &dev_attr_office_max.attr,
279 &dev_attr_office_dim.attr,
280 &dev_attr_daylight_max.attr,
281 &dev_attr_daylight_dim.attr,
282 NULL
283 };
284
285 static const struct attribute_group adp5520_bl_attr_group = {
286 .attrs = adp5520_bl_attributes,
287 };
288
adp5520_bl_probe(struct platform_device * pdev)289 static int adp5520_bl_probe(struct platform_device *pdev)
290 {
291 struct backlight_properties props;
292 struct backlight_device *bl;
293 struct adp5520_bl *data;
294 int ret = 0;
295
296 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
297 if (data == NULL)
298 return -ENOMEM;
299
300 data->master = pdev->dev.parent;
301 data->pdata = dev_get_platdata(&pdev->dev);
302
303 if (data->pdata == NULL) {
304 dev_err(&pdev->dev, "missing platform data\n");
305 return -ENODEV;
306 }
307
308 data->id = pdev->id;
309 data->current_brightness = 0;
310
311 mutex_init(&data->lock);
312
313 memset(&props, 0, sizeof(struct backlight_properties));
314 props.type = BACKLIGHT_RAW;
315 props.max_brightness = ADP5020_MAX_BRIGHTNESS;
316 bl = devm_backlight_device_register(&pdev->dev, pdev->name,
317 data->master, data, &adp5520_bl_ops,
318 &props);
319 if (IS_ERR(bl)) {
320 dev_err(&pdev->dev, "failed to register backlight\n");
321 return PTR_ERR(bl);
322 }
323
324 bl->props.brightness = ADP5020_MAX_BRIGHTNESS;
325 if (data->pdata->en_ambl_sens)
326 ret = sysfs_create_group(&bl->dev.kobj,
327 &adp5520_bl_attr_group);
328
329 if (ret) {
330 dev_err(&pdev->dev, "failed to register sysfs\n");
331 return ret;
332 }
333
334 platform_set_drvdata(pdev, bl);
335 ret = adp5520_bl_setup(bl);
336 if (ret) {
337 dev_err(&pdev->dev, "failed to setup\n");
338 if (data->pdata->en_ambl_sens)
339 sysfs_remove_group(&bl->dev.kobj,
340 &adp5520_bl_attr_group);
341 return ret;
342 }
343
344 backlight_update_status(bl);
345
346 return 0;
347 }
348
adp5520_bl_remove(struct platform_device * pdev)349 static int adp5520_bl_remove(struct platform_device *pdev)
350 {
351 struct backlight_device *bl = platform_get_drvdata(pdev);
352 struct adp5520_bl *data = bl_get_data(bl);
353
354 adp5520_clr_bits(data->master, ADP5520_MODE_STATUS, ADP5520_BL_EN);
355
356 if (data->pdata->en_ambl_sens)
357 sysfs_remove_group(&bl->dev.kobj,
358 &adp5520_bl_attr_group);
359
360 return 0;
361 }
362
363 #ifdef CONFIG_PM_SLEEP
adp5520_bl_suspend(struct device * dev)364 static int adp5520_bl_suspend(struct device *dev)
365 {
366 struct backlight_device *bl = dev_get_drvdata(dev);
367
368 return adp5520_bl_set(bl, 0);
369 }
370
adp5520_bl_resume(struct device * dev)371 static int adp5520_bl_resume(struct device *dev)
372 {
373 struct backlight_device *bl = dev_get_drvdata(dev);
374
375 backlight_update_status(bl);
376 return 0;
377 }
378 #endif
379
380 static SIMPLE_DEV_PM_OPS(adp5520_bl_pm_ops, adp5520_bl_suspend,
381 adp5520_bl_resume);
382
383 static struct platform_driver adp5520_bl_driver = {
384 .driver = {
385 .name = "adp5520-backlight",
386 .pm = &adp5520_bl_pm_ops,
387 },
388 .probe = adp5520_bl_probe,
389 .remove = adp5520_bl_remove,
390 };
391
392 module_platform_driver(adp5520_bl_driver);
393
394 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
395 MODULE_DESCRIPTION("ADP5520(01) Backlight Driver");
396 MODULE_LICENSE("GPL");
397 MODULE_ALIAS("platform:adp5520-backlight");
398
