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7f26c970 JH |
1 | /* |
2 | * lm3533-bl.c -- LM3533 Backlight driver | |
3 | * | |
4 | * Copyright (C) 2011-2012 Texas Instruments | |
5 | * | |
6 | * Author: Johan Hovold <jhovold@gmail.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation; either version 2 of the License, or (at your | |
11 | * option) any later version. | |
12 | */ | |
13 | ||
14 | #include <linux/module.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/backlight.h> | |
18 | #include <linux/fb.h> | |
19 | #include <linux/slab.h> | |
20 | ||
21 | #include <linux/mfd/lm3533.h> | |
22 | ||
23 | ||
24 | #define LM3533_HVCTRLBANK_COUNT 2 | |
25 | #define LM3533_BL_MAX_BRIGHTNESS 255 | |
26 | ||
27 | #define LM3533_REG_CTRLBANK_AB_BCONF 0x1a | |
28 | ||
29 | ||
30 | struct lm3533_bl { | |
31 | struct lm3533 *lm3533; | |
32 | struct lm3533_ctrlbank cb; | |
33 | struct backlight_device *bd; | |
34 | int id; | |
35 | }; | |
36 | ||
37 | ||
38 | static inline int lm3533_bl_get_ctrlbank_id(struct lm3533_bl *bl) | |
39 | { | |
40 | return bl->id; | |
41 | } | |
42 | ||
43 | static int lm3533_bl_update_status(struct backlight_device *bd) | |
44 | { | |
45 | struct lm3533_bl *bl = bl_get_data(bd); | |
46 | int brightness = bd->props.brightness; | |
47 | ||
48 | if (bd->props.power != FB_BLANK_UNBLANK) | |
49 | brightness = 0; | |
50 | if (bd->props.fb_blank != FB_BLANK_UNBLANK) | |
51 | brightness = 0; | |
52 | ||
53 | return lm3533_ctrlbank_set_brightness(&bl->cb, (u8)brightness); | |
54 | } | |
55 | ||
56 | static int lm3533_bl_get_brightness(struct backlight_device *bd) | |
57 | { | |
58 | struct lm3533_bl *bl = bl_get_data(bd); | |
59 | u8 val; | |
60 | int ret; | |
61 | ||
62 | ret = lm3533_ctrlbank_get_brightness(&bl->cb, &val); | |
63 | if (ret) | |
64 | return ret; | |
65 | ||
66 | return val; | |
67 | } | |
68 | ||
69 | static const struct backlight_ops lm3533_bl_ops = { | |
70 | .get_brightness = lm3533_bl_get_brightness, | |
71 | .update_status = lm3533_bl_update_status, | |
72 | }; | |
73 | ||
74 | static ssize_t show_id(struct device *dev, | |
75 | struct device_attribute *attr, char *buf) | |
76 | { | |
77 | struct lm3533_bl *bl = dev_get_drvdata(dev); | |
78 | ||
79 | return scnprintf(buf, PAGE_SIZE, "%d\n", bl->id); | |
80 | } | |
81 | ||
82 | static ssize_t show_als_channel(struct device *dev, | |
83 | struct device_attribute *attr, char *buf) | |
84 | { | |
85 | struct lm3533_bl *bl = dev_get_drvdata(dev); | |
86 | unsigned channel = lm3533_bl_get_ctrlbank_id(bl); | |
87 | ||
88 | return scnprintf(buf, PAGE_SIZE, "%u\n", channel); | |
89 | } | |
90 | ||
91 | static ssize_t show_als_en(struct device *dev, | |
92 | struct device_attribute *attr, char *buf) | |
93 | { | |
94 | struct lm3533_bl *bl = dev_get_drvdata(dev); | |
95 | int ctrlbank = lm3533_bl_get_ctrlbank_id(bl); | |
96 | u8 val; | |
97 | u8 mask; | |
98 | bool enable; | |
99 | int ret; | |
100 | ||
101 | ret = lm3533_read(bl->lm3533, LM3533_REG_CTRLBANK_AB_BCONF, &val); | |
102 | if (ret) | |
103 | return ret; | |
104 | ||
105 | mask = 1 << (2 * ctrlbank); | |
106 | enable = val & mask; | |
107 | ||
108 | return scnprintf(buf, PAGE_SIZE, "%d\n", enable); | |
109 | } | |
110 | ||
111 | static ssize_t store_als_en(struct device *dev, | |
112 | struct device_attribute *attr, | |
113 | const char *buf, size_t len) | |
114 | { | |
115 | struct lm3533_bl *bl = dev_get_drvdata(dev); | |
116 | int ctrlbank = lm3533_bl_get_ctrlbank_id(bl); | |
117 | int enable; | |
118 | u8 val; | |
119 | u8 mask; | |
120 | int ret; | |
121 | ||
122 | if (kstrtoint(buf, 0, &enable)) | |
123 | return -EINVAL; | |
124 | ||
125 | mask = 1 << (2 * ctrlbank); | |
126 | ||
127 | if (enable) | |
128 | val = mask; | |
129 | else | |
130 | val = 0; | |
131 | ||
132 | ret = lm3533_update(bl->lm3533, LM3533_REG_CTRLBANK_AB_BCONF, val, | |
133 | mask); | |
134 | if (ret) | |
135 | return ret; | |
136 | ||
137 | return len; | |
138 | } | |
139 | ||
140 | static ssize_t show_linear(struct device *dev, | |
141 | struct device_attribute *attr, char *buf) | |
142 | { | |
143 | struct lm3533_bl *bl = dev_get_drvdata(dev); | |
144 | u8 val; | |
145 | u8 mask; | |
146 | int linear; | |
147 | int ret; | |
148 | ||
149 | ret = lm3533_read(bl->lm3533, LM3533_REG_CTRLBANK_AB_BCONF, &val); | |
150 | if (ret) | |
151 | return ret; | |
152 | ||
153 | mask = 1 << (2 * lm3533_bl_get_ctrlbank_id(bl) + 1); | |
154 | ||
155 | if (val & mask) | |
156 | linear = 1; | |
157 | else | |
158 | linear = 0; | |
159 | ||
160 | return scnprintf(buf, PAGE_SIZE, "%x\n", linear); | |
161 | } | |
162 | ||
163 | static ssize_t store_linear(struct device *dev, | |
164 | struct device_attribute *attr, | |
165 | const char *buf, size_t len) | |
166 | { | |
167 | struct lm3533_bl *bl = dev_get_drvdata(dev); | |
168 | unsigned long linear; | |
169 | u8 mask; | |
170 | u8 val; | |
171 | int ret; | |
172 | ||
173 | if (kstrtoul(buf, 0, &linear)) | |
174 | return -EINVAL; | |
175 | ||
176 | mask = 1 << (2 * lm3533_bl_get_ctrlbank_id(bl) + 1); | |
177 | ||
178 | if (linear) | |
179 | val = mask; | |
180 | else | |
181 | val = 0; | |
182 | ||
183 | ret = lm3533_update(bl->lm3533, LM3533_REG_CTRLBANK_AB_BCONF, val, | |
184 | mask); | |
185 | if (ret) | |
186 | return ret; | |
187 | ||
188 | return len; | |
189 | } | |
190 | ||
191 | static ssize_t show_pwm(struct device *dev, | |
192 | struct device_attribute *attr, | |
193 | char *buf) | |
194 | { | |
195 | struct lm3533_bl *bl = dev_get_drvdata(dev); | |
196 | u8 val; | |
197 | int ret; | |
198 | ||
199 | ret = lm3533_ctrlbank_get_pwm(&bl->cb, &val); | |
200 | if (ret) | |
201 | return ret; | |
202 | ||
203 | return scnprintf(buf, PAGE_SIZE, "%u\n", val); | |
204 | } | |
205 | ||
206 | static ssize_t store_pwm(struct device *dev, | |
207 | struct device_attribute *attr, | |
208 | const char *buf, size_t len) | |
209 | { | |
210 | struct lm3533_bl *bl = dev_get_drvdata(dev); | |
211 | u8 val; | |
212 | int ret; | |
213 | ||
214 | if (kstrtou8(buf, 0, &val)) | |
215 | return -EINVAL; | |
216 | ||
217 | ret = lm3533_ctrlbank_set_pwm(&bl->cb, val); | |
218 | if (ret) | |
219 | return ret; | |
220 | ||
221 | return len; | |
222 | } | |
223 | ||
224 | static LM3533_ATTR_RO(als_channel); | |
225 | static LM3533_ATTR_RW(als_en); | |
226 | static LM3533_ATTR_RO(id); | |
227 | static LM3533_ATTR_RW(linear); | |
228 | static LM3533_ATTR_RW(pwm); | |
229 | ||
230 | static struct attribute *lm3533_bl_attributes[] = { | |
231 | &dev_attr_als_channel.attr, | |
232 | &dev_attr_als_en.attr, | |
233 | &dev_attr_id.attr, | |
234 | &dev_attr_linear.attr, | |
235 | &dev_attr_pwm.attr, | |
236 | NULL, | |
237 | }; | |
238 | ||
239 | static umode_t lm3533_bl_attr_is_visible(struct kobject *kobj, | |
240 | struct attribute *attr, int n) | |
241 | { | |
242 | struct device *dev = container_of(kobj, struct device, kobj); | |
243 | struct lm3533_bl *bl = dev_get_drvdata(dev); | |
244 | umode_t mode = attr->mode; | |
245 | ||
246 | if (attr == &dev_attr_als_channel.attr || | |
247 | attr == &dev_attr_als_en.attr) { | |
248 | if (!bl->lm3533->have_als) | |
249 | mode = 0; | |
250 | } | |
251 | ||
252 | return mode; | |
253 | }; | |
254 | ||
255 | static struct attribute_group lm3533_bl_attribute_group = { | |
256 | .is_visible = lm3533_bl_attr_is_visible, | |
257 | .attrs = lm3533_bl_attributes | |
258 | }; | |
259 | ||
1b9e450d | 260 | static int lm3533_bl_setup(struct lm3533_bl *bl, |
7f26c970 JH |
261 | struct lm3533_bl_platform_data *pdata) |
262 | { | |
263 | int ret; | |
264 | ||
265 | ret = lm3533_ctrlbank_set_max_current(&bl->cb, pdata->max_current); | |
266 | if (ret) | |
267 | return ret; | |
268 | ||
269 | return lm3533_ctrlbank_set_pwm(&bl->cb, pdata->pwm); | |
270 | } | |
271 | ||
1b9e450d | 272 | static int lm3533_bl_probe(struct platform_device *pdev) |
7f26c970 JH |
273 | { |
274 | struct lm3533 *lm3533; | |
275 | struct lm3533_bl_platform_data *pdata; | |
276 | struct lm3533_bl *bl; | |
277 | struct backlight_device *bd; | |
278 | struct backlight_properties props; | |
279 | int ret; | |
280 | ||
281 | dev_dbg(&pdev->dev, "%s\n", __func__); | |
282 | ||
283 | lm3533 = dev_get_drvdata(pdev->dev.parent); | |
284 | if (!lm3533) | |
285 | return -EINVAL; | |
286 | ||
c512794c | 287 | pdata = dev_get_platdata(&pdev->dev); |
7f26c970 JH |
288 | if (!pdata) { |
289 | dev_err(&pdev->dev, "no platform data\n"); | |
290 | return -EINVAL; | |
291 | } | |
292 | ||
293 | if (pdev->id < 0 || pdev->id >= LM3533_HVCTRLBANK_COUNT) { | |
294 | dev_err(&pdev->dev, "illegal backlight id %d\n", pdev->id); | |
295 | return -EINVAL; | |
296 | } | |
297 | ||
b4a74615 | 298 | bl = devm_kzalloc(&pdev->dev, sizeof(*bl), GFP_KERNEL); |
44d516f9 | 299 | if (!bl) |
7f26c970 | 300 | return -ENOMEM; |
7f26c970 JH |
301 | |
302 | bl->lm3533 = lm3533; | |
303 | bl->id = pdev->id; | |
304 | ||
305 | bl->cb.lm3533 = lm3533; | |
306 | bl->cb.id = lm3533_bl_get_ctrlbank_id(bl); | |
307 | bl->cb.dev = NULL; /* until registered */ | |
308 | ||
309 | memset(&props, 0, sizeof(props)); | |
310 | props.type = BACKLIGHT_RAW; | |
311 | props.max_brightness = LM3533_BL_MAX_BRIGHTNESS; | |
312 | props.brightness = pdata->default_brightness; | |
e86c7098 JH |
313 | bd = devm_backlight_device_register(&pdev->dev, pdata->name, |
314 | pdev->dev.parent, bl, &lm3533_bl_ops, | |
315 | &props); | |
7f26c970 JH |
316 | if (IS_ERR(bd)) { |
317 | dev_err(&pdev->dev, "failed to register backlight device\n"); | |
b4a74615 | 318 | return PTR_ERR(bd); |
7f26c970 JH |
319 | } |
320 | ||
321 | bl->bd = bd; | |
322 | bl->cb.dev = &bl->bd->dev; | |
323 | ||
324 | platform_set_drvdata(pdev, bl); | |
325 | ||
326 | ret = sysfs_create_group(&bd->dev.kobj, &lm3533_bl_attribute_group); | |
327 | if (ret < 0) { | |
328 | dev_err(&pdev->dev, "failed to create sysfs attributes\n"); | |
e86c7098 | 329 | return ret; |
7f26c970 JH |
330 | } |
331 | ||
332 | backlight_update_status(bd); | |
333 | ||
334 | ret = lm3533_bl_setup(bl, pdata); | |
335 | if (ret) | |
336 | goto err_sysfs_remove; | |
337 | ||
338 | ret = lm3533_ctrlbank_enable(&bl->cb); | |
339 | if (ret) | |
340 | goto err_sysfs_remove; | |
341 | ||
342 | return 0; | |
343 | ||
344 | err_sysfs_remove: | |
345 | sysfs_remove_group(&bd->dev.kobj, &lm3533_bl_attribute_group); | |
7f26c970 JH |
346 | |
347 | return ret; | |
348 | } | |
349 | ||
7e4b9d0b | 350 | static int lm3533_bl_remove(struct platform_device *pdev) |
7f26c970 JH |
351 | { |
352 | struct lm3533_bl *bl = platform_get_drvdata(pdev); | |
353 | struct backlight_device *bd = bl->bd; | |
354 | ||
355 | dev_dbg(&bd->dev, "%s\n", __func__); | |
356 | ||
357 | bd->props.power = FB_BLANK_POWERDOWN; | |
358 | bd->props.brightness = 0; | |
359 | ||
360 | lm3533_ctrlbank_disable(&bl->cb); | |
361 | sysfs_remove_group(&bd->dev.kobj, &lm3533_bl_attribute_group); | |
7f26c970 JH |
362 | |
363 | return 0; | |
364 | } | |
365 | ||
b0792962 JH |
366 | #ifdef CONFIG_PM_SLEEP |
367 | static int lm3533_bl_suspend(struct device *dev) | |
7f26c970 | 368 | { |
b0792962 | 369 | struct lm3533_bl *bl = dev_get_drvdata(dev); |
7f26c970 | 370 | |
b0792962 | 371 | dev_dbg(dev, "%s\n", __func__); |
7f26c970 JH |
372 | |
373 | return lm3533_ctrlbank_disable(&bl->cb); | |
374 | } | |
375 | ||
b0792962 | 376 | static int lm3533_bl_resume(struct device *dev) |
7f26c970 | 377 | { |
b0792962 | 378 | struct lm3533_bl *bl = dev_get_drvdata(dev); |
7f26c970 | 379 | |
b0792962 | 380 | dev_dbg(dev, "%s\n", __func__); |
7f26c970 JH |
381 | |
382 | return lm3533_ctrlbank_enable(&bl->cb); | |
383 | } | |
7f26c970 JH |
384 | #endif |
385 | ||
b0792962 JH |
386 | static SIMPLE_DEV_PM_OPS(lm3533_bl_pm_ops, lm3533_bl_suspend, lm3533_bl_resume); |
387 | ||
7f26c970 JH |
388 | static void lm3533_bl_shutdown(struct platform_device *pdev) |
389 | { | |
390 | struct lm3533_bl *bl = platform_get_drvdata(pdev); | |
391 | ||
392 | dev_dbg(&pdev->dev, "%s\n", __func__); | |
393 | ||
394 | lm3533_ctrlbank_disable(&bl->cb); | |
395 | } | |
396 | ||
397 | static struct platform_driver lm3533_bl_driver = { | |
398 | .driver = { | |
399 | .name = "lm3533-backlight", | |
400 | .owner = THIS_MODULE, | |
b0792962 | 401 | .pm = &lm3533_bl_pm_ops, |
7f26c970 JH |
402 | }, |
403 | .probe = lm3533_bl_probe, | |
d1723fa2 | 404 | .remove = lm3533_bl_remove, |
7f26c970 | 405 | .shutdown = lm3533_bl_shutdown, |
7f26c970 JH |
406 | }; |
407 | module_platform_driver(lm3533_bl_driver); | |
408 | ||
409 | MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>"); | |
410 | MODULE_DESCRIPTION("LM3533 Backlight driver"); | |
411 | MODULE_LICENSE("GPL"); | |
412 | MODULE_ALIAS("platform:lm3533-backlight"); |