Commit | Line | Data |
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7be865ab KM |
1 | /* |
2 | * TI LP855x Backlight Driver | |
3 | * | |
4 | * Copyright (C) 2011 Texas Instruments | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/i2c.h> | |
15 | #include <linux/backlight.h> | |
60255307 | 16 | #include <linux/delay.h> |
7be865ab | 17 | #include <linux/err.h> |
4add0664 | 18 | #include <linux/of.h> |
f7f95056 | 19 | #include <linux/platform_data/lp855x.h> |
8cc9764c | 20 | #include <linux/pwm.h> |
829b030e | 21 | #include <linux/regulator/consumer.h> |
7be865ab | 22 | |
26e8ccc2 KM |
23 | /* LP8550/1/2/3/6 Registers */ |
24 | #define LP855X_BRIGHTNESS_CTRL 0x00 | |
25 | #define LP855X_DEVICE_CTRL 0x01 | |
26 | #define LP855X_EEPROM_START 0xA0 | |
27 | #define LP855X_EEPROM_END 0xA7 | |
28 | #define LP8556_EPROM_START 0xA0 | |
29 | #define LP8556_EPROM_END 0xAF | |
30 | ||
5812c13a | 31 | /* LP8555/7 Registers */ |
26e8ccc2 KM |
32 | #define LP8557_BL_CMD 0x00 |
33 | #define LP8557_BL_MASK 0x01 | |
34 | #define LP8557_BL_ON 0x01 | |
35 | #define LP8557_BL_OFF 0x00 | |
36 | #define LP8557_BRIGHTNESS_CTRL 0x04 | |
37 | #define LP8557_CONFIG 0x10 | |
5812c13a MK |
38 | #define LP8555_EPROM_START 0x10 |
39 | #define LP8555_EPROM_END 0x7A | |
26e8ccc2 KM |
40 | #define LP8557_EPROM_START 0x10 |
41 | #define LP8557_EPROM_END 0x1E | |
7be865ab | 42 | |
7be865ab KM |
43 | #define DEFAULT_BL_NAME "lcd-backlight" |
44 | #define MAX_BRIGHTNESS 255 | |
45 | ||
0b818573 KM |
46 | enum lp855x_brightness_ctrl_mode { |
47 | PWM_BASED = 1, | |
48 | REGISTER_BASED, | |
49 | }; | |
50 | ||
68853bc2 KM |
51 | struct lp855x; |
52 | ||
53 | /* | |
54 | * struct lp855x_device_config | |
55 | * @pre_init_device: init device function call before updating the brightness | |
56 | * @reg_brightness: register address for brigthenss control | |
57 | * @reg_devicectrl: register address for device control | |
58 | * @post_init_device: late init device function call | |
59 | */ | |
60 | struct lp855x_device_config { | |
61 | int (*pre_init_device)(struct lp855x *); | |
62 | u8 reg_brightness; | |
63 | u8 reg_devicectrl; | |
64 | int (*post_init_device)(struct lp855x *); | |
65 | }; | |
66 | ||
7be865ab KM |
67 | struct lp855x { |
68 | const char *chipname; | |
69 | enum lp855x_chip_id chip_id; | |
0b818573 | 70 | enum lp855x_brightness_ctrl_mode mode; |
68853bc2 | 71 | struct lp855x_device_config *cfg; |
7be865ab KM |
72 | struct i2c_client *client; |
73 | struct backlight_device *bl; | |
74 | struct device *dev; | |
7be865ab | 75 | struct lp855x_platform_data *pdata; |
8cc9764c | 76 | struct pwm_device *pwm; |
fe009175 | 77 | struct regulator *supply; /* regulator for VDD input */ |
60255307 | 78 | struct regulator *enable; /* regulator for EN/VDDIO input */ |
7be865ab KM |
79 | }; |
80 | ||
7be865ab KM |
81 | static int lp855x_write_byte(struct lp855x *lp, u8 reg, u8 data) |
82 | { | |
eaa4d02f | 83 | return i2c_smbus_write_byte_data(lp->client, reg, data); |
7be865ab KM |
84 | } |
85 | ||
26e8ccc2 KM |
86 | static int lp855x_update_bit(struct lp855x *lp, u8 reg, u8 mask, u8 data) |
87 | { | |
88 | int ret; | |
89 | u8 tmp; | |
90 | ||
91 | ret = i2c_smbus_read_byte_data(lp->client, reg); | |
92 | if (ret < 0) { | |
93 | dev_err(lp->dev, "failed to read 0x%.2x\n", reg); | |
94 | return ret; | |
95 | } | |
96 | ||
97 | tmp = (u8)ret; | |
98 | tmp &= ~mask; | |
99 | tmp |= data & mask; | |
100 | ||
101 | return lp855x_write_byte(lp, reg, tmp); | |
102 | } | |
103 | ||
7be865ab KM |
104 | static bool lp855x_is_valid_rom_area(struct lp855x *lp, u8 addr) |
105 | { | |
106 | u8 start, end; | |
107 | ||
108 | switch (lp->chip_id) { | |
109 | case LP8550: | |
110 | case LP8551: | |
111 | case LP8552: | |
112 | case LP8553: | |
26e8ccc2 KM |
113 | start = LP855X_EEPROM_START; |
114 | end = LP855X_EEPROM_END; | |
7be865ab KM |
115 | break; |
116 | case LP8556: | |
26e8ccc2 KM |
117 | start = LP8556_EPROM_START; |
118 | end = LP8556_EPROM_END; | |
119 | break; | |
5812c13a MK |
120 | case LP8555: |
121 | start = LP8555_EPROM_START; | |
122 | end = LP8555_EPROM_END; | |
123 | break; | |
26e8ccc2 KM |
124 | case LP8557: |
125 | start = LP8557_EPROM_START; | |
126 | end = LP8557_EPROM_END; | |
7be865ab KM |
127 | break; |
128 | default: | |
129 | return false; | |
130 | } | |
131 | ||
2ce23860 | 132 | return addr >= start && addr <= end; |
7be865ab KM |
133 | } |
134 | ||
26e8ccc2 KM |
135 | static int lp8557_bl_off(struct lp855x *lp) |
136 | { | |
137 | /* BL_ON = 0 before updating EPROM settings */ | |
138 | return lp855x_update_bit(lp, LP8557_BL_CMD, LP8557_BL_MASK, | |
139 | LP8557_BL_OFF); | |
140 | } | |
141 | ||
142 | static int lp8557_bl_on(struct lp855x *lp) | |
143 | { | |
144 | /* BL_ON = 1 after updating EPROM settings */ | |
145 | return lp855x_update_bit(lp, LP8557_BL_CMD, LP8557_BL_MASK, | |
146 | LP8557_BL_ON); | |
147 | } | |
148 | ||
68853bc2 | 149 | static struct lp855x_device_config lp855x_dev_cfg = { |
26e8ccc2 KM |
150 | .reg_brightness = LP855X_BRIGHTNESS_CTRL, |
151 | .reg_devicectrl = LP855X_DEVICE_CTRL, | |
152 | }; | |
153 | ||
154 | static struct lp855x_device_config lp8557_dev_cfg = { | |
155 | .reg_brightness = LP8557_BRIGHTNESS_CTRL, | |
156 | .reg_devicectrl = LP8557_CONFIG, | |
157 | .pre_init_device = lp8557_bl_off, | |
158 | .post_init_device = lp8557_bl_on, | |
68853bc2 KM |
159 | }; |
160 | ||
161 | /* | |
162 | * Device specific configuration flow | |
163 | * | |
164 | * a) pre_init_device(optional) | |
165 | * b) update the brightness register | |
166 | * c) update device control register | |
167 | * d) update ROM area(optional) | |
168 | * e) post_init_device(optional) | |
169 | * | |
170 | */ | |
171 | static int lp855x_configure(struct lp855x *lp) | |
7be865ab KM |
172 | { |
173 | u8 val, addr; | |
174 | int i, ret; | |
175 | struct lp855x_platform_data *pd = lp->pdata; | |
176 | ||
68853bc2 | 177 | switch (lp->chip_id) { |
5812c13a MK |
178 | case LP8550: |
179 | case LP8551: | |
180 | case LP8552: | |
181 | case LP8553: | |
182 | case LP8556: | |
68853bc2 KM |
183 | lp->cfg = &lp855x_dev_cfg; |
184 | break; | |
5812c13a | 185 | case LP8555: |
26e8ccc2 KM |
186 | case LP8557: |
187 | lp->cfg = &lp8557_dev_cfg; | |
188 | break; | |
68853bc2 KM |
189 | default: |
190 | return -EINVAL; | |
191 | } | |
192 | ||
193 | if (lp->cfg->pre_init_device) { | |
194 | ret = lp->cfg->pre_init_device(lp); | |
195 | if (ret) { | |
196 | dev_err(lp->dev, "pre init device err: %d\n", ret); | |
197 | goto err; | |
198 | } | |
199 | } | |
200 | ||
7be865ab | 201 | val = pd->initial_brightness; |
68853bc2 | 202 | ret = lp855x_write_byte(lp, lp->cfg->reg_brightness, val); |
7be865ab | 203 | if (ret) |
68853bc2 | 204 | goto err; |
7be865ab KM |
205 | |
206 | val = pd->device_control; | |
68853bc2 | 207 | ret = lp855x_write_byte(lp, lp->cfg->reg_devicectrl, val); |
7be865ab | 208 | if (ret) |
68853bc2 | 209 | goto err; |
7be865ab | 210 | |
c365e59d | 211 | if (pd->size_program > 0) { |
7be865ab KM |
212 | for (i = 0; i < pd->size_program; i++) { |
213 | addr = pd->rom_data[i].addr; | |
214 | val = pd->rom_data[i].val; | |
215 | if (!lp855x_is_valid_rom_area(lp, addr)) | |
216 | continue; | |
217 | ||
218 | ret = lp855x_write_byte(lp, addr, val); | |
219 | if (ret) | |
68853bc2 KM |
220 | goto err; |
221 | } | |
222 | } | |
223 | ||
224 | if (lp->cfg->post_init_device) { | |
225 | ret = lp->cfg->post_init_device(lp); | |
226 | if (ret) { | |
227 | dev_err(lp->dev, "post init device err: %d\n", ret); | |
228 | goto err; | |
7be865ab KM |
229 | } |
230 | } | |
231 | ||
68853bc2 KM |
232 | return 0; |
233 | ||
234 | err: | |
7be865ab KM |
235 | return ret; |
236 | } | |
237 | ||
8cc9764c KM |
238 | static void lp855x_pwm_ctrl(struct lp855x *lp, int br, int max_br) |
239 | { | |
240 | unsigned int period = lp->pdata->period_ns; | |
241 | unsigned int duty = br * period / max_br; | |
242 | struct pwm_device *pwm; | |
243 | ||
244 | /* request pwm device with the consumer name */ | |
245 | if (!lp->pwm) { | |
246 | pwm = devm_pwm_get(lp->dev, lp->chipname); | |
247 | if (IS_ERR(pwm)) | |
248 | return; | |
249 | ||
250 | lp->pwm = pwm; | |
6fbab835 BB |
251 | |
252 | /* | |
253 | * FIXME: pwm_apply_args() should be removed when switching to | |
254 | * the atomic PWM API. | |
255 | */ | |
256 | pwm_apply_args(pwm); | |
8cc9764c KM |
257 | } |
258 | ||
259 | pwm_config(lp->pwm, duty, period); | |
260 | if (duty) | |
261 | pwm_enable(lp->pwm); | |
262 | else | |
263 | pwm_disable(lp->pwm); | |
264 | } | |
265 | ||
7be865ab KM |
266 | static int lp855x_bl_update_status(struct backlight_device *bl) |
267 | { | |
268 | struct lp855x *lp = bl_get_data(bl); | |
61c1c614 | 269 | int brightness = bl->props.brightness; |
7be865ab | 270 | |
9f0a511f | 271 | if (bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK)) |
61c1c614 | 272 | brightness = 0; |
7be865ab | 273 | |
61c1c614 SP |
274 | if (lp->mode == PWM_BASED) |
275 | lp855x_pwm_ctrl(lp, brightness, bl->props.max_brightness); | |
276 | else if (lp->mode == REGISTER_BASED) | |
277 | lp855x_write_byte(lp, lp->cfg->reg_brightness, (u8)brightness); | |
7be865ab KM |
278 | |
279 | return 0; | |
280 | } | |
281 | ||
7be865ab KM |
282 | static const struct backlight_ops lp855x_bl_ops = { |
283 | .options = BL_CORE_SUSPENDRESUME, | |
284 | .update_status = lp855x_bl_update_status, | |
7be865ab KM |
285 | }; |
286 | ||
287 | static int lp855x_backlight_register(struct lp855x *lp) | |
288 | { | |
289 | struct backlight_device *bl; | |
290 | struct backlight_properties props; | |
291 | struct lp855x_platform_data *pdata = lp->pdata; | |
600ffd33 | 292 | const char *name = pdata->name ? : DEFAULT_BL_NAME; |
7be865ab | 293 | |
9f7898f3 | 294 | memset(&props, 0, sizeof(props)); |
7be865ab KM |
295 | props.type = BACKLIGHT_PLATFORM; |
296 | props.max_brightness = MAX_BRIGHTNESS; | |
297 | ||
298 | if (pdata->initial_brightness > props.max_brightness) | |
299 | pdata->initial_brightness = props.max_brightness; | |
300 | ||
301 | props.brightness = pdata->initial_brightness; | |
302 | ||
6255e8e9 | 303 | bl = devm_backlight_device_register(lp->dev, name, lp->dev, lp, |
7be865ab KM |
304 | &lp855x_bl_ops, &props); |
305 | if (IS_ERR(bl)) | |
306 | return PTR_ERR(bl); | |
307 | ||
308 | lp->bl = bl; | |
309 | ||
310 | return 0; | |
311 | } | |
312 | ||
7be865ab KM |
313 | static ssize_t lp855x_get_chip_id(struct device *dev, |
314 | struct device_attribute *attr, char *buf) | |
315 | { | |
316 | struct lp855x *lp = dev_get_drvdata(dev); | |
a94cb126 | 317 | |
6a7aeb1a | 318 | return scnprintf(buf, PAGE_SIZE, "%s\n", lp->chipname); |
7be865ab KM |
319 | } |
320 | ||
321 | static ssize_t lp855x_get_bl_ctl_mode(struct device *dev, | |
322 | struct device_attribute *attr, char *buf) | |
323 | { | |
324 | struct lp855x *lp = dev_get_drvdata(dev); | |
7be865ab KM |
325 | char *strmode = NULL; |
326 | ||
0b818573 | 327 | if (lp->mode == PWM_BASED) |
7be865ab | 328 | strmode = "pwm based"; |
0b818573 | 329 | else if (lp->mode == REGISTER_BASED) |
7be865ab KM |
330 | strmode = "register based"; |
331 | ||
6a7aeb1a | 332 | return scnprintf(buf, PAGE_SIZE, "%s\n", strmode); |
7be865ab KM |
333 | } |
334 | ||
335 | static DEVICE_ATTR(chip_id, S_IRUGO, lp855x_get_chip_id, NULL); | |
336 | static DEVICE_ATTR(bl_ctl_mode, S_IRUGO, lp855x_get_bl_ctl_mode, NULL); | |
337 | ||
338 | static struct attribute *lp855x_attributes[] = { | |
339 | &dev_attr_chip_id.attr, | |
340 | &dev_attr_bl_ctl_mode.attr, | |
341 | NULL, | |
342 | }; | |
343 | ||
344 | static const struct attribute_group lp855x_attr_group = { | |
345 | .attrs = lp855x_attributes, | |
346 | }; | |
347 | ||
4add0664 | 348 | #ifdef CONFIG_OF |
47726656 | 349 | static int lp855x_parse_dt(struct lp855x *lp) |
4add0664 | 350 | { |
47726656 SP |
351 | struct device *dev = lp->dev; |
352 | struct device_node *node = dev->of_node; | |
4add0664 KM |
353 | struct lp855x_platform_data *pdata; |
354 | int rom_length; | |
355 | ||
356 | if (!node) { | |
357 | dev_err(dev, "no platform data\n"); | |
358 | return -EINVAL; | |
359 | } | |
360 | ||
361 | pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); | |
362 | if (!pdata) | |
363 | return -ENOMEM; | |
364 | ||
365 | of_property_read_string(node, "bl-name", &pdata->name); | |
366 | of_property_read_u8(node, "dev-ctrl", &pdata->device_control); | |
367 | of_property_read_u8(node, "init-brt", &pdata->initial_brightness); | |
368 | of_property_read_u32(node, "pwm-period", &pdata->period_ns); | |
369 | ||
370 | /* Fill ROM platform data if defined */ | |
371 | rom_length = of_get_child_count(node); | |
372 | if (rom_length > 0) { | |
373 | struct lp855x_rom_data *rom; | |
374 | struct device_node *child; | |
375 | int i = 0; | |
376 | ||
a86854d0 | 377 | rom = devm_kcalloc(dev, rom_length, sizeof(*rom), GFP_KERNEL); |
4add0664 KM |
378 | if (!rom) |
379 | return -ENOMEM; | |
380 | ||
381 | for_each_child_of_node(node, child) { | |
382 | of_property_read_u8(child, "rom-addr", &rom[i].addr); | |
383 | of_property_read_u8(child, "rom-val", &rom[i].val); | |
384 | i++; | |
385 | } | |
386 | ||
387 | pdata->size_program = rom_length; | |
388 | pdata->rom_data = &rom[0]; | |
389 | } | |
390 | ||
47726656 | 391 | lp->pdata = pdata; |
4add0664 KM |
392 | |
393 | return 0; | |
394 | } | |
395 | #else | |
47726656 | 396 | static int lp855x_parse_dt(struct lp855x *lp) |
4add0664 KM |
397 | { |
398 | return -EINVAL; | |
399 | } | |
400 | #endif | |
401 | ||
7be865ab KM |
402 | static int lp855x_probe(struct i2c_client *cl, const struct i2c_device_id *id) |
403 | { | |
404 | struct lp855x *lp; | |
7be865ab KM |
405 | int ret; |
406 | ||
7be865ab KM |
407 | if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) |
408 | return -EIO; | |
409 | ||
410 | lp = devm_kzalloc(&cl->dev, sizeof(struct lp855x), GFP_KERNEL); | |
411 | if (!lp) | |
412 | return -ENOMEM; | |
413 | ||
7be865ab KM |
414 | lp->client = cl; |
415 | lp->dev = &cl->dev; | |
7be865ab KM |
416 | lp->chipname = id->name; |
417 | lp->chip_id = id->driver_data; | |
47726656 SP |
418 | lp->pdata = dev_get_platdata(&cl->dev); |
419 | ||
420 | if (!lp->pdata) { | |
421 | ret = lp855x_parse_dt(lp); | |
422 | if (ret < 0) | |
423 | return ret; | |
424 | } | |
425 | ||
426 | if (lp->pdata->period_ns > 0) | |
427 | lp->mode = PWM_BASED; | |
428 | else | |
429 | lp->mode = REGISTER_BASED; | |
430 | ||
fe009175 MK |
431 | lp->supply = devm_regulator_get(lp->dev, "power"); |
432 | if (IS_ERR(lp->supply)) { | |
433 | if (PTR_ERR(lp->supply) == -EPROBE_DEFER) | |
434 | return -EPROBE_DEFER; | |
435 | lp->supply = NULL; | |
436 | } | |
437 | ||
60255307 BN |
438 | lp->enable = devm_regulator_get_optional(lp->dev, "enable"); |
439 | if (IS_ERR(lp->enable)) { | |
440 | ret = PTR_ERR(lp->enable); | |
441 | if (ret == -ENODEV) { | |
442 | lp->enable = NULL; | |
443 | } else { | |
444 | if (ret != -EPROBE_DEFER) | |
445 | dev_err(lp->dev, "error getting enable regulator: %d\n", | |
446 | ret); | |
447 | return ret; | |
448 | } | |
449 | } | |
450 | ||
fe009175 MK |
451 | if (lp->supply) { |
452 | ret = regulator_enable(lp->supply); | |
829b030e SP |
453 | if (ret < 0) { |
454 | dev_err(&cl->dev, "failed to enable supply: %d\n", ret); | |
455 | return ret; | |
456 | } | |
457 | } | |
458 | ||
60255307 BN |
459 | if (lp->enable) { |
460 | ret = regulator_enable(lp->enable); | |
461 | if (ret < 0) { | |
462 | dev_err(lp->dev, "failed to enable vddio: %d\n", ret); | |
463 | return ret; | |
464 | } | |
465 | ||
466 | /* | |
467 | * LP8555 datasheet says t_RESPONSE (time between VDDIO and | |
468 | * I2C) is 1ms. | |
469 | */ | |
470 | usleep_range(1000, 2000); | |
471 | } | |
472 | ||
7be865ab KM |
473 | i2c_set_clientdata(cl, lp); |
474 | ||
68853bc2 | 475 | ret = lp855x_configure(lp); |
7be865ab | 476 | if (ret) { |
68853bc2 | 477 | dev_err(lp->dev, "device config err: %d", ret); |
6255e8e9 | 478 | return ret; |
7be865ab KM |
479 | } |
480 | ||
481 | ret = lp855x_backlight_register(lp); | |
482 | if (ret) { | |
483 | dev_err(lp->dev, | |
484 | "failed to register backlight. err: %d\n", ret); | |
6255e8e9 | 485 | return ret; |
7be865ab KM |
486 | } |
487 | ||
488 | ret = sysfs_create_group(&lp->dev->kobj, &lp855x_attr_group); | |
489 | if (ret) { | |
490 | dev_err(lp->dev, "failed to register sysfs. err: %d\n", ret); | |
6255e8e9 | 491 | return ret; |
7be865ab KM |
492 | } |
493 | ||
494 | backlight_update_status(lp->bl); | |
495 | return 0; | |
7be865ab KM |
496 | } |
497 | ||
7e4b9d0b | 498 | static int lp855x_remove(struct i2c_client *cl) |
7be865ab KM |
499 | { |
500 | struct lp855x *lp = i2c_get_clientdata(cl); | |
501 | ||
502 | lp->bl->props.brightness = 0; | |
503 | backlight_update_status(lp->bl); | |
fe009175 MK |
504 | if (lp->supply) |
505 | regulator_disable(lp->supply); | |
7be865ab | 506 | sysfs_remove_group(&lp->dev->kobj, &lp855x_attr_group); |
7be865ab KM |
507 | |
508 | return 0; | |
509 | } | |
510 | ||
4add0664 KM |
511 | static const struct of_device_id lp855x_dt_ids[] = { |
512 | { .compatible = "ti,lp8550", }, | |
513 | { .compatible = "ti,lp8551", }, | |
514 | { .compatible = "ti,lp8552", }, | |
515 | { .compatible = "ti,lp8553", }, | |
5812c13a | 516 | { .compatible = "ti,lp8555", }, |
4add0664 KM |
517 | { .compatible = "ti,lp8556", }, |
518 | { .compatible = "ti,lp8557", }, | |
519 | { } | |
520 | }; | |
521 | MODULE_DEVICE_TABLE(of, lp855x_dt_ids); | |
522 | ||
7be865ab KM |
523 | static const struct i2c_device_id lp855x_ids[] = { |
524 | {"lp8550", LP8550}, | |
525 | {"lp8551", LP8551}, | |
526 | {"lp8552", LP8552}, | |
527 | {"lp8553", LP8553}, | |
5812c13a | 528 | {"lp8555", LP8555}, |
7be865ab | 529 | {"lp8556", LP8556}, |
26e8ccc2 | 530 | {"lp8557", LP8557}, |
7be865ab KM |
531 | { } |
532 | }; | |
533 | MODULE_DEVICE_TABLE(i2c, lp855x_ids); | |
534 | ||
535 | static struct i2c_driver lp855x_driver = { | |
536 | .driver = { | |
537 | .name = "lp855x", | |
4add0664 | 538 | .of_match_table = of_match_ptr(lp855x_dt_ids), |
7be865ab KM |
539 | }, |
540 | .probe = lp855x_probe, | |
d1723fa2 | 541 | .remove = lp855x_remove, |
7be865ab KM |
542 | .id_table = lp855x_ids, |
543 | }; | |
544 | ||
545 | module_i2c_driver(lp855x_driver); | |
546 | ||
547 | MODULE_DESCRIPTION("Texas Instruments LP855x Backlight driver"); | |
548 | MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>"); | |
549 | MODULE_LICENSE("GPL"); |