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1 | /* | |
2 | * Simple driver for Texas Instruments LM3642 LED Flash driver chip | |
3 | * Copyright (C) 2012 Texas Instruments | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | */ | |
10 | #include <linux/module.h> | |
11 | #include <linux/delay.h> | |
12 | #include <linux/i2c.h> | |
13 | #include <linux/leds.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/fs.h> | |
17 | #include <linux/regmap.h> | |
18 | #include <linux/workqueue.h> | |
19 | #include <linux/platform_data/leds-lm3642.h> | |
20 | ||
21 | #define REG_FILT_TIME (0x0) | |
22 | #define REG_IVFM_MODE (0x1) | |
23 | #define REG_TORCH_TIME (0x6) | |
24 | #define REG_FLASH (0x8) | |
25 | #define REG_I_CTRL (0x9) | |
26 | #define REG_ENABLE (0xA) | |
27 | #define REG_FLAG (0xB) | |
28 | #define REG_MAX (0xB) | |
29 | ||
30 | #define UVLO_EN_SHIFT (7) | |
31 | #define IVM_D_TH_SHIFT (2) | |
32 | #define TORCH_RAMP_UP_TIME_SHIFT (3) | |
33 | #define TORCH_RAMP_DN_TIME_SHIFT (0) | |
34 | #define INDUCTOR_I_LIMIT_SHIFT (6) | |
35 | #define FLASH_RAMP_TIME_SHIFT (3) | |
36 | #define FLASH_TOUT_TIME_SHIFT (0) | |
37 | #define TORCH_I_SHIFT (4) | |
38 | #define FLASH_I_SHIFT (0) | |
39 | #define IVFM_SHIFT (7) | |
40 | #define TX_PIN_EN_SHIFT (6) | |
41 | #define STROBE_PIN_EN_SHIFT (5) | |
42 | #define TORCH_PIN_EN_SHIFT (4) | |
43 | #define MODE_BITS_SHIFT (0) | |
44 | ||
45 | #define UVLO_EN_MASK (0x1) | |
46 | #define IVM_D_TH_MASK (0x7) | |
47 | #define TORCH_RAMP_UP_TIME_MASK (0x7) | |
48 | #define TORCH_RAMP_DN_TIME_MASK (0x7) | |
49 | #define INDUCTOR_I_LIMIT_MASK (0x1) | |
50 | #define FLASH_RAMP_TIME_MASK (0x7) | |
51 | #define FLASH_TOUT_TIME_MASK (0x7) | |
52 | #define TORCH_I_MASK (0x7) | |
53 | #define FLASH_I_MASK (0xF) | |
54 | #define IVFM_MASK (0x1) | |
55 | #define TX_PIN_EN_MASK (0x1) | |
56 | #define STROBE_PIN_EN_MASK (0x1) | |
57 | #define TORCH_PIN_EN_MASK (0x1) | |
58 | #define MODE_BITS_MASK (0x73) | |
59 | #define EX_PIN_CONTROL_MASK (0x71) | |
60 | #define EX_PIN_ENABLE_MASK (0x70) | |
61 | ||
62 | enum lm3642_mode { | |
63 | MODES_STASNDBY = 0, | |
64 | MODES_INDIC, | |
65 | MODES_TORCH, | |
66 | MODES_FLASH | |
67 | }; | |
68 | ||
69 | struct lm3642_chip_data { | |
70 | struct device *dev; | |
71 | ||
72 | struct led_classdev cdev_flash; | |
73 | struct led_classdev cdev_torch; | |
74 | struct led_classdev cdev_indicator; | |
75 | ||
76 | struct work_struct work_flash; | |
77 | struct work_struct work_torch; | |
78 | struct work_struct work_indicator; | |
79 | ||
80 | u8 br_flash; | |
81 | u8 br_torch; | |
82 | u8 br_indicator; | |
83 | ||
84 | enum lm3642_torch_pin_enable torch_pin; | |
85 | enum lm3642_strobe_pin_enable strobe_pin; | |
86 | enum lm3642_tx_pin_enable tx_pin; | |
87 | ||
88 | struct lm3642_platform_data *pdata; | |
89 | struct regmap *regmap; | |
90 | struct mutex lock; | |
91 | ||
92 | unsigned int last_flag; | |
93 | }; | |
94 | ||
95 | /* chip initialize */ | |
96 | static int lm3642_chip_init(struct lm3642_chip_data *chip) | |
97 | { | |
98 | int ret; | |
99 | struct lm3642_platform_data *pdata = chip->pdata; | |
100 | ||
101 | /* set enable register */ | |
102 | ret = regmap_update_bits(chip->regmap, REG_ENABLE, EX_PIN_ENABLE_MASK, | |
103 | pdata->tx_pin); | |
104 | if (ret < 0) | |
105 | dev_err(chip->dev, "Failed to update REG_ENABLE Register\n"); | |
106 | return ret; | |
107 | } | |
108 | ||
109 | /* chip control */ | |
110 | static int lm3642_control(struct lm3642_chip_data *chip, | |
111 | u8 brightness, enum lm3642_mode opmode) | |
112 | { | |
113 | int ret; | |
114 | ||
115 | ret = regmap_read(chip->regmap, REG_FLAG, &chip->last_flag); | |
116 | if (ret < 0) { | |
117 | dev_err(chip->dev, "Failed to read REG_FLAG Register\n"); | |
118 | goto out; | |
119 | } | |
120 | ||
121 | if (chip->last_flag) | |
122 | dev_info(chip->dev, "Last FLAG is 0x%x\n", chip->last_flag); | |
123 | ||
124 | /* brightness 0 means off-state */ | |
125 | if (!brightness) | |
126 | opmode = MODES_STASNDBY; | |
127 | ||
128 | switch (opmode) { | |
129 | case MODES_TORCH: | |
130 | ret = regmap_update_bits(chip->regmap, REG_I_CTRL, | |
131 | TORCH_I_MASK << TORCH_I_SHIFT, | |
132 | (brightness - 1) << TORCH_I_SHIFT); | |
133 | ||
134 | if (chip->torch_pin) | |
135 | opmode |= (TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT); | |
136 | break; | |
137 | ||
138 | case MODES_FLASH: | |
139 | ret = regmap_update_bits(chip->regmap, REG_I_CTRL, | |
140 | FLASH_I_MASK << FLASH_I_SHIFT, | |
141 | (brightness - 1) << FLASH_I_SHIFT); | |
142 | ||
143 | if (chip->strobe_pin) | |
144 | opmode |= (STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT); | |
145 | break; | |
146 | ||
147 | case MODES_INDIC: | |
148 | ret = regmap_update_bits(chip->regmap, REG_I_CTRL, | |
149 | TORCH_I_MASK << TORCH_I_SHIFT, | |
150 | (brightness - 1) << TORCH_I_SHIFT); | |
151 | break; | |
152 | ||
153 | case MODES_STASNDBY: | |
154 | ||
155 | break; | |
156 | ||
157 | default: | |
158 | return ret; | |
159 | } | |
160 | if (ret < 0) { | |
161 | dev_err(chip->dev, "Failed to write REG_I_CTRL Register\n"); | |
162 | goto out; | |
163 | } | |
164 | ||
165 | if (chip->tx_pin) | |
166 | opmode |= (TX_PIN_EN_MASK << TX_PIN_EN_SHIFT); | |
167 | ||
168 | ret = regmap_update_bits(chip->regmap, REG_ENABLE, | |
169 | MODE_BITS_MASK << MODE_BITS_SHIFT, | |
170 | opmode << MODE_BITS_SHIFT); | |
171 | out: | |
172 | return ret; | |
173 | } | |
174 | ||
175 | /* torch */ | |
176 | ||
177 | /* torch pin config for lm3642*/ | |
178 | static ssize_t lm3642_torch_pin_store(struct device *dev, | |
179 | struct device_attribute *attr, | |
180 | const char *buf, size_t size) | |
181 | { | |
182 | ssize_t ret; | |
183 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
184 | struct lm3642_chip_data *chip = | |
185 | container_of(led_cdev, struct lm3642_chip_data, cdev_indicator); | |
186 | unsigned int state; | |
187 | ||
188 | ret = kstrtouint(buf, 10, &state); | |
189 | if (ret) | |
190 | goto out_strtoint; | |
191 | if (state != 0) | |
192 | state = 0x01 << TORCH_PIN_EN_SHIFT; | |
193 | ||
194 | chip->torch_pin = state; | |
195 | ret = regmap_update_bits(chip->regmap, REG_ENABLE, | |
196 | TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT, | |
197 | state); | |
198 | if (ret < 0) | |
199 | goto out; | |
200 | ||
201 | return size; | |
202 | out: | |
203 | dev_err(chip->dev, "%s:i2c access fail to register\n", __func__); | |
204 | return ret; | |
205 | out_strtoint: | |
206 | dev_err(chip->dev, "%s: fail to change str to int\n", __func__); | |
207 | return ret; | |
208 | } | |
209 | ||
210 | static DEVICE_ATTR(torch_pin, S_IWUSR, NULL, lm3642_torch_pin_store); | |
211 | ||
212 | static void lm3642_deferred_torch_brightness_set(struct work_struct *work) | |
213 | { | |
214 | struct lm3642_chip_data *chip = | |
215 | container_of(work, struct lm3642_chip_data, work_torch); | |
216 | ||
217 | mutex_lock(&chip->lock); | |
218 | lm3642_control(chip, chip->br_torch, MODES_TORCH); | |
219 | mutex_unlock(&chip->lock); | |
220 | } | |
221 | ||
222 | static void lm3642_torch_brightness_set(struct led_classdev *cdev, | |
223 | enum led_brightness brightness) | |
224 | { | |
225 | struct lm3642_chip_data *chip = | |
226 | container_of(cdev, struct lm3642_chip_data, cdev_torch); | |
227 | ||
228 | chip->br_torch = brightness; | |
229 | schedule_work(&chip->work_torch); | |
230 | } | |
231 | ||
232 | /* flash */ | |
233 | ||
234 | /* strobe pin config for lm3642*/ | |
235 | static ssize_t lm3642_strobe_pin_store(struct device *dev, | |
236 | struct device_attribute *attr, | |
237 | const char *buf, size_t size) | |
238 | { | |
239 | ssize_t ret; | |
240 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
241 | struct lm3642_chip_data *chip = | |
242 | container_of(led_cdev, struct lm3642_chip_data, cdev_indicator); | |
243 | unsigned int state; | |
244 | ||
245 | ret = kstrtouint(buf, 10, &state); | |
246 | if (ret) | |
247 | goto out_strtoint; | |
248 | if (state != 0) | |
249 | state = 0x01 << STROBE_PIN_EN_SHIFT; | |
250 | ||
251 | chip->strobe_pin = state; | |
252 | ret = regmap_update_bits(chip->regmap, REG_ENABLE, | |
253 | STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT, | |
254 | state); | |
255 | if (ret < 0) | |
256 | goto out; | |
257 | ||
258 | return size; | |
259 | out: | |
260 | dev_err(chip->dev, "%s:i2c access fail to register\n", __func__); | |
261 | return ret; | |
262 | out_strtoint: | |
263 | dev_err(chip->dev, "%s: fail to change str to int\n", __func__); | |
264 | return ret; | |
265 | } | |
266 | ||
267 | static DEVICE_ATTR(strobe_pin, S_IWUSR, NULL, lm3642_strobe_pin_store); | |
268 | ||
269 | static void lm3642_deferred_strobe_brightness_set(struct work_struct *work) | |
270 | { | |
271 | struct lm3642_chip_data *chip = | |
272 | container_of(work, struct lm3642_chip_data, work_flash); | |
273 | ||
274 | mutex_lock(&chip->lock); | |
275 | lm3642_control(chip, chip->br_flash, MODES_FLASH); | |
276 | mutex_unlock(&chip->lock); | |
277 | } | |
278 | ||
279 | static void lm3642_strobe_brightness_set(struct led_classdev *cdev, | |
280 | enum led_brightness brightness) | |
281 | { | |
282 | struct lm3642_chip_data *chip = | |
283 | container_of(cdev, struct lm3642_chip_data, cdev_flash); | |
284 | ||
285 | chip->br_flash = brightness; | |
286 | schedule_work(&chip->work_flash); | |
287 | } | |
288 | ||
289 | /* indicator */ | |
290 | static void lm3642_deferred_indicator_brightness_set(struct work_struct *work) | |
291 | { | |
292 | struct lm3642_chip_data *chip = | |
293 | container_of(work, struct lm3642_chip_data, work_indicator); | |
294 | ||
295 | mutex_lock(&chip->lock); | |
296 | lm3642_control(chip, chip->br_indicator, MODES_INDIC); | |
297 | mutex_unlock(&chip->lock); | |
298 | } | |
299 | ||
300 | static void lm3642_indicator_brightness_set(struct led_classdev *cdev, | |
301 | enum led_brightness brightness) | |
302 | { | |
303 | struct lm3642_chip_data *chip = | |
304 | container_of(cdev, struct lm3642_chip_data, cdev_indicator); | |
305 | ||
306 | chip->br_indicator = brightness; | |
307 | schedule_work(&chip->work_indicator); | |
308 | } | |
309 | ||
310 | static const struct regmap_config lm3642_regmap = { | |
311 | .reg_bits = 8, | |
312 | .val_bits = 8, | |
313 | .max_register = REG_MAX, | |
314 | }; | |
315 | ||
316 | static struct attribute *lm3642_flash_attrs[] = { | |
317 | &dev_attr_strobe_pin.attr, | |
318 | NULL | |
319 | }; | |
320 | ATTRIBUTE_GROUPS(lm3642_flash); | |
321 | ||
322 | static struct attribute *lm3642_torch_attrs[] = { | |
323 | &dev_attr_torch_pin.attr, | |
324 | NULL | |
325 | }; | |
326 | ATTRIBUTE_GROUPS(lm3642_torch); | |
327 | ||
328 | static int lm3642_probe(struct i2c_client *client, | |
329 | const struct i2c_device_id *id) | |
330 | { | |
331 | struct lm3642_platform_data *pdata = dev_get_platdata(&client->dev); | |
332 | struct lm3642_chip_data *chip; | |
333 | ||
334 | int err; | |
335 | ||
336 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { | |
337 | dev_err(&client->dev, "i2c functionality check fail.\n"); | |
338 | return -EOPNOTSUPP; | |
339 | } | |
340 | ||
341 | if (pdata == NULL) { | |
342 | dev_err(&client->dev, "needs Platform Data.\n"); | |
343 | return -ENODATA; | |
344 | } | |
345 | ||
346 | chip = devm_kzalloc(&client->dev, | |
347 | sizeof(struct lm3642_chip_data), GFP_KERNEL); | |
348 | if (!chip) | |
349 | return -ENOMEM; | |
350 | ||
351 | chip->dev = &client->dev; | |
352 | chip->pdata = pdata; | |
353 | ||
354 | chip->tx_pin = pdata->tx_pin; | |
355 | chip->torch_pin = pdata->torch_pin; | |
356 | chip->strobe_pin = pdata->strobe_pin; | |
357 | ||
358 | chip->regmap = devm_regmap_init_i2c(client, &lm3642_regmap); | |
359 | if (IS_ERR(chip->regmap)) { | |
360 | err = PTR_ERR(chip->regmap); | |
361 | dev_err(&client->dev, "Failed to allocate register map: %d\n", | |
362 | err); | |
363 | return err; | |
364 | } | |
365 | ||
366 | mutex_init(&chip->lock); | |
367 | i2c_set_clientdata(client, chip); | |
368 | ||
369 | err = lm3642_chip_init(chip); | |
370 | if (err < 0) | |
371 | goto err_out; | |
372 | ||
373 | /* flash */ | |
374 | INIT_WORK(&chip->work_flash, lm3642_deferred_strobe_brightness_set); | |
375 | chip->cdev_flash.name = "flash"; | |
376 | chip->cdev_flash.max_brightness = 16; | |
377 | chip->cdev_flash.brightness_set = lm3642_strobe_brightness_set; | |
378 | chip->cdev_flash.default_trigger = "flash"; | |
379 | chip->cdev_flash.groups = lm3642_flash_groups, | |
380 | err = led_classdev_register((struct device *) | |
381 | &client->dev, &chip->cdev_flash); | |
382 | if (err < 0) { | |
383 | dev_err(chip->dev, "failed to register flash\n"); | |
384 | goto err_out; | |
385 | } | |
386 | ||
387 | /* torch */ | |
388 | INIT_WORK(&chip->work_torch, lm3642_deferred_torch_brightness_set); | |
389 | chip->cdev_torch.name = "torch"; | |
390 | chip->cdev_torch.max_brightness = 8; | |
391 | chip->cdev_torch.brightness_set = lm3642_torch_brightness_set; | |
392 | chip->cdev_torch.default_trigger = "torch"; | |
393 | chip->cdev_torch.groups = lm3642_torch_groups, | |
394 | err = led_classdev_register((struct device *) | |
395 | &client->dev, &chip->cdev_torch); | |
396 | if (err < 0) { | |
397 | dev_err(chip->dev, "failed to register torch\n"); | |
398 | goto err_create_torch_file; | |
399 | } | |
400 | ||
401 | /* indicator */ | |
402 | INIT_WORK(&chip->work_indicator, | |
403 | lm3642_deferred_indicator_brightness_set); | |
404 | chip->cdev_indicator.name = "indicator"; | |
405 | chip->cdev_indicator.max_brightness = 8; | |
406 | chip->cdev_indicator.brightness_set = lm3642_indicator_brightness_set; | |
407 | err = led_classdev_register((struct device *) | |
408 | &client->dev, &chip->cdev_indicator); | |
409 | if (err < 0) { | |
410 | dev_err(chip->dev, "failed to register indicator\n"); | |
411 | goto err_create_indicator_file; | |
412 | } | |
413 | ||
414 | dev_info(&client->dev, "LM3642 is initialized\n"); | |
415 | return 0; | |
416 | ||
417 | err_create_indicator_file: | |
418 | led_classdev_unregister(&chip->cdev_torch); | |
419 | err_create_torch_file: | |
420 | led_classdev_unregister(&chip->cdev_flash); | |
421 | err_out: | |
422 | return err; | |
423 | } | |
424 | ||
425 | static int lm3642_remove(struct i2c_client *client) | |
426 | { | |
427 | struct lm3642_chip_data *chip = i2c_get_clientdata(client); | |
428 | ||
429 | led_classdev_unregister(&chip->cdev_indicator); | |
430 | flush_work(&chip->work_indicator); | |
431 | led_classdev_unregister(&chip->cdev_torch); | |
432 | flush_work(&chip->work_torch); | |
433 | led_classdev_unregister(&chip->cdev_flash); | |
434 | flush_work(&chip->work_flash); | |
435 | regmap_write(chip->regmap, REG_ENABLE, 0); | |
436 | return 0; | |
437 | } | |
438 | ||
439 | static const struct i2c_device_id lm3642_id[] = { | |
440 | {LM3642_NAME, 0}, | |
441 | {} | |
442 | }; | |
443 | ||
444 | MODULE_DEVICE_TABLE(i2c, lm3642_id); | |
445 | ||
446 | static struct i2c_driver lm3642_i2c_driver = { | |
447 | .driver = { | |
448 | .name = LM3642_NAME, | |
449 | .owner = THIS_MODULE, | |
450 | .pm = NULL, | |
451 | }, | |
452 | .probe = lm3642_probe, | |
453 | .remove = lm3642_remove, | |
454 | .id_table = lm3642_id, | |
455 | }; | |
456 | ||
457 | module_i2c_driver(lm3642_i2c_driver); | |
458 | ||
459 | MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3642"); | |
460 | MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>"); | |
461 | MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>"); | |
462 | MODULE_LICENSE("GPL v2"); |