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