1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Backlight driver for Analog Devices ADP5520/ADP5501 MFD PMICs
4 *
5 * Copyright 2009 Analog Devices Inc.
6 */
7
8 #include <linux/kernel.h>
9 #include <linux/init.h>
10 #include <linux/platform_device.h>
11 #include <linux/backlight.h>
12 #include <linux/mfd/adp5520.h>
13 #include <linux/slab.h>
14 #include <linux/module.h>
15
16 struct adp5520_bl {
17 struct device *master;
18 struct adp5520_backlight_platform_data *pdata;
19 struct mutex lock;
20 unsigned long cached_daylight_max;
21 int id;
22 int current_brightness;
23 };
24
adp5520_bl_set(struct backlight_device * bl,int brightness)25 static int adp5520_bl_set(struct backlight_device *bl, int brightness)
26 {
27 struct adp5520_bl *data = bl_get_data(bl);
28 struct device *master = data->master;
29 int ret = 0;
30
31 if (data->pdata->en_ambl_sens) {
32 if ((brightness > 0) && (brightness < ADP5020_MAX_BRIGHTNESS)) {
33 /* Disable Ambient Light auto adjust */
34 ret |= adp5520_clr_bits(master, ADP5520_BL_CONTROL,
35 ADP5520_BL_AUTO_ADJ);
36 ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX,
37 brightness);
38 } else {
39 /*
40 * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust
41 * restore daylight l3 sysfs brightness
42 */
43 ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX,
44 data->cached_daylight_max);
45 ret |= adp5520_set_bits(master, ADP5520_BL_CONTROL,
46 ADP5520_BL_AUTO_ADJ);
47 }
48 } else {
49 ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX, brightness);
50 }
51
52 if (data->current_brightness && brightness == 0)
53 ret |= adp5520_set_bits(master,
54 ADP5520_MODE_STATUS, ADP5520_DIM_EN);
55 else if (data->current_brightness == 0 && brightness)
56 ret |= adp5520_clr_bits(master,
57 ADP5520_MODE_STATUS, ADP5520_DIM_EN);
58
59 if (!ret)
60 data->current_brightness = brightness;
61
62 return ret;
63 }
64
adp5520_bl_update_status(struct backlight_device * bl)65 static int adp5520_bl_update_status(struct backlight_device *bl)
66 {
67 return adp5520_bl_set(bl, backlight_get_brightness(bl));
68 }
69
adp5520_bl_get_brightness(struct backlight_device * bl)70 static int adp5520_bl_get_brightness(struct backlight_device *bl)
71 {
72 struct adp5520_bl *data = bl_get_data(bl);
73 int error;
74 uint8_t reg_val;
75
76 error = adp5520_read(data->master, ADP5520_BL_VALUE, ®_val);
77
78 return error ? data->current_brightness : reg_val;
79 }
80
81 static const struct backlight_ops adp5520_bl_ops = {
82 .update_status = adp5520_bl_update_status,
83 .get_brightness = adp5520_bl_get_brightness,
84 };
85
adp5520_bl_setup(struct backlight_device * bl)86 static int adp5520_bl_setup(struct backlight_device *bl)
87 {
88 struct adp5520_bl *data = bl_get_data(bl);
89 struct device *master = data->master;
90 struct adp5520_backlight_platform_data *pdata = data->pdata;
91 int ret = 0;
92
93 ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX,
94 pdata->l1_daylight_max);
95 ret |= adp5520_write(master, ADP5520_DAYLIGHT_DIM,
96 pdata->l1_daylight_dim);
97
98 if (pdata->en_ambl_sens) {
99 data->cached_daylight_max = pdata->l1_daylight_max;
100 ret |= adp5520_write(master, ADP5520_OFFICE_MAX,
101 pdata->l2_office_max);
102 ret |= adp5520_write(master, ADP5520_OFFICE_DIM,
103 pdata->l2_office_dim);
104 ret |= adp5520_write(master, ADP5520_DARK_MAX,
105 pdata->l3_dark_max);
106 ret |= adp5520_write(master, ADP5520_DARK_DIM,
107 pdata->l3_dark_dim);
108 ret |= adp5520_write(master, ADP5520_L2_TRIP,
109 pdata->l2_trip);
110 ret |= adp5520_write(master, ADP5520_L2_HYS,
111 pdata->l2_hyst);
112 ret |= adp5520_write(master, ADP5520_L3_TRIP,
113 pdata->l3_trip);
114 ret |= adp5520_write(master, ADP5520_L3_HYS,
115 pdata->l3_hyst);
116 ret |= adp5520_write(master, ADP5520_ALS_CMPR_CFG,
117 ALS_CMPR_CFG_VAL(pdata->abml_filt,
118 ADP5520_L3_EN));
119 }
120
121 ret |= adp5520_write(master, ADP5520_BL_CONTROL,
122 BL_CTRL_VAL(pdata->fade_led_law,
123 pdata->en_ambl_sens));
124
125 ret |= adp5520_write(master, ADP5520_BL_FADE, FADE_VAL(pdata->fade_in,
126 pdata->fade_out));
127
128 ret |= adp5520_set_bits(master, ADP5520_MODE_STATUS,
129 ADP5520_BL_EN | ADP5520_DIM_EN);
130
131 return ret;
132 }
133
adp5520_show(struct device * dev,char * buf,int reg)134 static ssize_t adp5520_show(struct device *dev, char *buf, int reg)
135 {
136 struct adp5520_bl *data = dev_get_drvdata(dev);
137 int ret;
138 uint8_t reg_val;
139
140 mutex_lock(&data->lock);
141 ret = adp5520_read(data->master, reg, ®_val);
142 mutex_unlock(&data->lock);
143
144 if (ret < 0)
145 return ret;
146
147 return sprintf(buf, "%u\n", reg_val);
148 }
149
adp5520_store(struct device * dev,const char * buf,size_t count,int reg)150 static ssize_t adp5520_store(struct device *dev, const char *buf,
151 size_t count, int reg)
152 {
153 struct adp5520_bl *data = dev_get_drvdata(dev);
154 unsigned long val;
155 int ret;
156
157 ret = kstrtoul(buf, 10, &val);
158 if (ret)
159 return ret;
160
161 mutex_lock(&data->lock);
162 adp5520_write(data->master, reg, val);
163 mutex_unlock(&data->lock);
164
165 return count;
166 }
167
adp5520_bl_dark_max_show(struct device * dev,struct device_attribute * attr,char * buf)168 static ssize_t adp5520_bl_dark_max_show(struct device *dev,
169 struct device_attribute *attr, char *buf)
170 {
171 return adp5520_show(dev, buf, ADP5520_DARK_MAX);
172 }
173
adp5520_bl_dark_max_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)174 static ssize_t adp5520_bl_dark_max_store(struct device *dev,
175 struct device_attribute *attr,
176 const char *buf, size_t count)
177 {
178 return adp5520_store(dev, buf, count, ADP5520_DARK_MAX);
179 }
180 static DEVICE_ATTR(dark_max, 0664, adp5520_bl_dark_max_show,
181 adp5520_bl_dark_max_store);
182
adp5520_bl_office_max_show(struct device * dev,struct device_attribute * attr,char * buf)183 static ssize_t adp5520_bl_office_max_show(struct device *dev,
184 struct device_attribute *attr, char *buf)
185 {
186 return adp5520_show(dev, buf, ADP5520_OFFICE_MAX);
187 }
188
adp5520_bl_office_max_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)189 static ssize_t adp5520_bl_office_max_store(struct device *dev,
190 struct device_attribute *attr,
191 const char *buf, size_t count)
192 {
193 return adp5520_store(dev, buf, count, ADP5520_OFFICE_MAX);
194 }
195 static DEVICE_ATTR(office_max, 0664, adp5520_bl_office_max_show,
196 adp5520_bl_office_max_store);
197
adp5520_bl_daylight_max_show(struct device * dev,struct device_attribute * attr,char * buf)198 static ssize_t adp5520_bl_daylight_max_show(struct device *dev,
199 struct device_attribute *attr, char *buf)
200 {
201 return adp5520_show(dev, buf, ADP5520_DAYLIGHT_MAX);
202 }
203
adp5520_bl_daylight_max_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)204 static ssize_t adp5520_bl_daylight_max_store(struct device *dev,
205 struct device_attribute *attr,
206 const char *buf, size_t count)
207 {
208 struct adp5520_bl *data = dev_get_drvdata(dev);
209 int ret;
210
211 ret = kstrtoul(buf, 10, &data->cached_daylight_max);
212 if (ret < 0)
213 return ret;
214
215 return adp5520_store(dev, buf, count, ADP5520_DAYLIGHT_MAX);
216 }
217 static DEVICE_ATTR(daylight_max, 0664, adp5520_bl_daylight_max_show,
218 adp5520_bl_daylight_max_store);
219
adp5520_bl_dark_dim_show(struct device * dev,struct device_attribute * attr,char * buf)220 static ssize_t adp5520_bl_dark_dim_show(struct device *dev,
221 struct device_attribute *attr, char *buf)
222 {
223 return adp5520_show(dev, buf, ADP5520_DARK_DIM);
224 }
225
adp5520_bl_dark_dim_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)226 static ssize_t adp5520_bl_dark_dim_store(struct device *dev,
227 struct device_attribute *attr,
228 const char *buf, size_t count)
229 {
230 return adp5520_store(dev, buf, count, ADP5520_DARK_DIM);
231 }
232 static DEVICE_ATTR(dark_dim, 0664, adp5520_bl_dark_dim_show,
233 adp5520_bl_dark_dim_store);
234
adp5520_bl_office_dim_show(struct device * dev,struct device_attribute * attr,char * buf)235 static ssize_t adp5520_bl_office_dim_show(struct device *dev,
236 struct device_attribute *attr, char *buf)
237 {
238 return adp5520_show(dev, buf, ADP5520_OFFICE_DIM);
239 }
240
adp5520_bl_office_dim_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)241 static ssize_t adp5520_bl_office_dim_store(struct device *dev,
242 struct device_attribute *attr,
243 const char *buf, size_t count)
244 {
245 return adp5520_store(dev, buf, count, ADP5520_OFFICE_DIM);
246 }
247 static DEVICE_ATTR(office_dim, 0664, adp5520_bl_office_dim_show,
248 adp5520_bl_office_dim_store);
249
adp5520_bl_daylight_dim_show(struct device * dev,struct device_attribute * attr,char * buf)250 static ssize_t adp5520_bl_daylight_dim_show(struct device *dev,
251 struct device_attribute *attr, char *buf)
252 {
253 return adp5520_show(dev, buf, ADP5520_DAYLIGHT_DIM);
254 }
255
adp5520_bl_daylight_dim_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)256 static ssize_t adp5520_bl_daylight_dim_store(struct device *dev,
257 struct device_attribute *attr,
258 const char *buf, size_t count)
259 {
260 return adp5520_store(dev, buf, count, ADP5520_DAYLIGHT_DIM);
261 }
262 static DEVICE_ATTR(daylight_dim, 0664, adp5520_bl_daylight_dim_show,
263 adp5520_bl_daylight_dim_store);
264
265 static struct attribute *adp5520_bl_attributes[] = {
266 &dev_attr_dark_max.attr,
267 &dev_attr_dark_dim.attr,
268 &dev_attr_office_max.attr,
269 &dev_attr_office_dim.attr,
270 &dev_attr_daylight_max.attr,
271 &dev_attr_daylight_dim.attr,
272 NULL
273 };
274
275 static const struct attribute_group adp5520_bl_attr_group = {
276 .attrs = adp5520_bl_attributes,
277 };
278
adp5520_bl_probe(struct platform_device * pdev)279 static int adp5520_bl_probe(struct platform_device *pdev)
280 {
281 struct backlight_properties props;
282 struct backlight_device *bl;
283 struct adp5520_bl *data;
284 int ret = 0;
285
286 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
287 if (data == NULL)
288 return -ENOMEM;
289
290 data->master = pdev->dev.parent;
291 data->pdata = dev_get_platdata(&pdev->dev);
292
293 if (data->pdata == NULL) {
294 dev_err(&pdev->dev, "missing platform data\n");
295 return -ENODEV;
296 }
297
298 data->id = pdev->id;
299 data->current_brightness = 0;
300
301 mutex_init(&data->lock);
302
303 memset(&props, 0, sizeof(struct backlight_properties));
304 props.type = BACKLIGHT_RAW;
305 props.max_brightness = ADP5020_MAX_BRIGHTNESS;
306 bl = devm_backlight_device_register(&pdev->dev, pdev->name,
307 data->master, data, &adp5520_bl_ops,
308 &props);
309 if (IS_ERR(bl)) {
310 dev_err(&pdev->dev, "failed to register backlight\n");
311 return PTR_ERR(bl);
312 }
313
314 bl->props.brightness = ADP5020_MAX_BRIGHTNESS;
315 if (data->pdata->en_ambl_sens)
316 ret = sysfs_create_group(&bl->dev.kobj,
317 &adp5520_bl_attr_group);
318
319 if (ret) {
320 dev_err(&pdev->dev, "failed to register sysfs\n");
321 return ret;
322 }
323
324 platform_set_drvdata(pdev, bl);
325 ret = adp5520_bl_setup(bl);
326 if (ret) {
327 dev_err(&pdev->dev, "failed to setup\n");
328 if (data->pdata->en_ambl_sens)
329 sysfs_remove_group(&bl->dev.kobj,
330 &adp5520_bl_attr_group);
331 return ret;
332 }
333
334 backlight_update_status(bl);
335
336 return 0;
337 }
338
adp5520_bl_remove(struct platform_device * pdev)339 static void adp5520_bl_remove(struct platform_device *pdev)
340 {
341 struct backlight_device *bl = platform_get_drvdata(pdev);
342 struct adp5520_bl *data = bl_get_data(bl);
343
344 adp5520_clr_bits(data->master, ADP5520_MODE_STATUS, ADP5520_BL_EN);
345
346 if (data->pdata->en_ambl_sens)
347 sysfs_remove_group(&bl->dev.kobj,
348 &adp5520_bl_attr_group);
349 }
350
351 #ifdef CONFIG_PM_SLEEP
adp5520_bl_suspend(struct device * dev)352 static int adp5520_bl_suspend(struct device *dev)
353 {
354 struct backlight_device *bl = dev_get_drvdata(dev);
355
356 return adp5520_bl_set(bl, 0);
357 }
358
adp5520_bl_resume(struct device * dev)359 static int adp5520_bl_resume(struct device *dev)
360 {
361 struct backlight_device *bl = dev_get_drvdata(dev);
362
363 backlight_update_status(bl);
364 return 0;
365 }
366 #endif
367
368 static SIMPLE_DEV_PM_OPS(adp5520_bl_pm_ops, adp5520_bl_suspend,
369 adp5520_bl_resume);
370
371 static struct platform_driver adp5520_bl_driver = {
372 .driver = {
373 .name = "adp5520-backlight",
374 .pm = &adp5520_bl_pm_ops,
375 },
376 .probe = adp5520_bl_probe,
377 .remove = adp5520_bl_remove,
378 };
379
380 module_platform_driver(adp5520_bl_driver);
381
382 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
383 MODULE_DESCRIPTION("ADP5520(01) Backlight Driver");
384 MODULE_LICENSE("GPL");
385 MODULE_ALIAS("platform:adp5520-backlight");
386