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