Commit | Line | Data |
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8b7cfbec SJ |
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> | |
8b7cfbec SJ |
18 | #include <linux/platform_data/leds-lm3642.h> |
19 | ||
20 | #define REG_FILT_TIME (0x0) | |
21 | #define REG_IVFM_MODE (0x1) | |
22 | #define REG_TORCH_TIME (0x6) | |
23 | #define REG_FLASH (0x8) | |
24 | #define REG_I_CTRL (0x9) | |
25 | #define REG_ENABLE (0xA) | |
26 | #define REG_FLAG (0xB) | |
27 | #define REG_MAX (0xB) | |
28 | ||
29 | #define UVLO_EN_SHIFT (7) | |
30 | #define IVM_D_TH_SHIFT (2) | |
31 | #define TORCH_RAMP_UP_TIME_SHIFT (3) | |
32 | #define TORCH_RAMP_DN_TIME_SHIFT (0) | |
33 | #define INDUCTOR_I_LIMIT_SHIFT (6) | |
34 | #define FLASH_RAMP_TIME_SHIFT (3) | |
35 | #define FLASH_TOUT_TIME_SHIFT (0) | |
36 | #define TORCH_I_SHIFT (4) | |
37 | #define FLASH_I_SHIFT (0) | |
38 | #define IVFM_SHIFT (7) | |
39 | #define TX_PIN_EN_SHIFT (6) | |
40 | #define STROBE_PIN_EN_SHIFT (5) | |
41 | #define TORCH_PIN_EN_SHIFT (4) | |
42 | #define MODE_BITS_SHIFT (0) | |
43 | ||
44 | #define UVLO_EN_MASK (0x1) | |
45 | #define IVM_D_TH_MASK (0x7) | |
46 | #define TORCH_RAMP_UP_TIME_MASK (0x7) | |
47 | #define TORCH_RAMP_DN_TIME_MASK (0x7) | |
48 | #define INDUCTOR_I_LIMIT_MASK (0x1) | |
49 | #define FLASH_RAMP_TIME_MASK (0x7) | |
50 | #define FLASH_TOUT_TIME_MASK (0x7) | |
51 | #define TORCH_I_MASK (0x7) | |
52 | #define FLASH_I_MASK (0xF) | |
53 | #define IVFM_MASK (0x1) | |
54 | #define TX_PIN_EN_MASK (0x1) | |
55 | #define STROBE_PIN_EN_MASK (0x1) | |
56 | #define TORCH_PIN_EN_MASK (0x1) | |
57 | #define MODE_BITS_MASK (0x73) | |
58 | #define EX_PIN_CONTROL_MASK (0x71) | |
59 | #define EX_PIN_ENABLE_MASK (0x70) | |
60 | ||
61 | enum lm3642_mode { | |
62 | MODES_STASNDBY = 0, | |
63 | MODES_INDIC, | |
64 | MODES_TORCH, | |
65 | MODES_FLASH | |
66 | }; | |
67 | ||
68 | struct lm3642_chip_data { | |
69 | struct device *dev; | |
70 | ||
71 | struct led_classdev cdev_flash; | |
72 | struct led_classdev cdev_torch; | |
73 | struct led_classdev cdev_indicator; | |
74 | ||
8b7cfbec SJ |
75 | u8 br_flash; |
76 | u8 br_torch; | |
77 | u8 br_indicator; | |
78 | ||
79 | enum lm3642_torch_pin_enable torch_pin; | |
80 | enum lm3642_strobe_pin_enable strobe_pin; | |
81 | enum lm3642_tx_pin_enable tx_pin; | |
82 | ||
83 | struct lm3642_platform_data *pdata; | |
84 | struct regmap *regmap; | |
85 | struct mutex lock; | |
86 | ||
87 | unsigned int last_flag; | |
88 | }; | |
89 | ||
90 | /* chip initialize */ | |
98ea1ea2 | 91 | static int lm3642_chip_init(struct lm3642_chip_data *chip) |
8b7cfbec | 92 | { |
8b7cfbec SJ |
93 | int ret; |
94 | struct lm3642_platform_data *pdata = chip->pdata; | |
95 | ||
96 | /* set enable register */ | |
e76a322a AL |
97 | ret = regmap_update_bits(chip->regmap, REG_ENABLE, EX_PIN_ENABLE_MASK, |
98 | pdata->tx_pin); | |
8b7cfbec | 99 | if (ret < 0) |
e76a322a | 100 | dev_err(chip->dev, "Failed to update REG_ENABLE Register\n"); |
8b7cfbec SJ |
101 | return ret; |
102 | } | |
103 | ||
104 | /* chip control */ | |
105 | static int lm3642_control(struct lm3642_chip_data *chip, | |
106 | u8 brightness, enum lm3642_mode opmode) | |
107 | { | |
108 | int ret; | |
109 | ||
110 | ret = regmap_read(chip->regmap, REG_FLAG, &chip->last_flag); | |
111 | if (ret < 0) { | |
112 | dev_err(chip->dev, "Failed to read REG_FLAG Register\n"); | |
113 | goto out; | |
114 | } | |
115 | ||
116 | if (chip->last_flag) | |
117 | dev_info(chip->dev, "Last FLAG is 0x%x\n", chip->last_flag); | |
118 | ||
119 | /* brightness 0 means off-state */ | |
120 | if (!brightness) | |
121 | opmode = MODES_STASNDBY; | |
122 | ||
123 | switch (opmode) { | |
124 | case MODES_TORCH: | |
125 | ret = regmap_update_bits(chip->regmap, REG_I_CTRL, | |
126 | TORCH_I_MASK << TORCH_I_SHIFT, | |
127 | (brightness - 1) << TORCH_I_SHIFT); | |
128 | ||
129 | if (chip->torch_pin) | |
130 | opmode |= (TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT); | |
131 | break; | |
132 | ||
133 | case MODES_FLASH: | |
134 | ret = regmap_update_bits(chip->regmap, REG_I_CTRL, | |
135 | FLASH_I_MASK << FLASH_I_SHIFT, | |
136 | (brightness - 1) << FLASH_I_SHIFT); | |
137 | ||
138 | if (chip->strobe_pin) | |
139 | opmode |= (STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT); | |
140 | break; | |
141 | ||
142 | case MODES_INDIC: | |
143 | ret = regmap_update_bits(chip->regmap, REG_I_CTRL, | |
144 | TORCH_I_MASK << TORCH_I_SHIFT, | |
145 | (brightness - 1) << TORCH_I_SHIFT); | |
146 | break; | |
147 | ||
148 | case MODES_STASNDBY: | |
149 | ||
150 | break; | |
151 | ||
152 | default: | |
153 | return ret; | |
154 | } | |
155 | if (ret < 0) { | |
156 | dev_err(chip->dev, "Failed to write REG_I_CTRL Register\n"); | |
157 | goto out; | |
158 | } | |
159 | ||
160 | if (chip->tx_pin) | |
161 | opmode |= (TX_PIN_EN_MASK << TX_PIN_EN_SHIFT); | |
162 | ||
163 | ret = regmap_update_bits(chip->regmap, REG_ENABLE, | |
164 | MODE_BITS_MASK << MODE_BITS_SHIFT, | |
165 | opmode << MODE_BITS_SHIFT); | |
166 | out: | |
167 | return ret; | |
168 | } | |
169 | ||
170 | /* torch */ | |
171 | ||
172 | /* torch pin config for lm3642*/ | |
173 | static ssize_t lm3642_torch_pin_store(struct device *dev, | |
85b4b756 | 174 | struct device_attribute *attr, |
8b7cfbec SJ |
175 | const char *buf, size_t size) |
176 | { | |
177 | ssize_t ret; | |
178 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
179 | struct lm3642_chip_data *chip = | |
180 | container_of(led_cdev, struct lm3642_chip_data, cdev_indicator); | |
181 | unsigned int state; | |
182 | ||
183 | ret = kstrtouint(buf, 10, &state); | |
184 | if (ret) | |
185 | goto out_strtoint; | |
186 | if (state != 0) | |
187 | state = 0x01 << TORCH_PIN_EN_SHIFT; | |
188 | ||
189 | chip->torch_pin = state; | |
190 | ret = regmap_update_bits(chip->regmap, REG_ENABLE, | |
191 | TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT, | |
192 | state); | |
193 | if (ret < 0) | |
194 | goto out; | |
195 | ||
196 | return size; | |
197 | out: | |
198 | dev_err(chip->dev, "%s:i2c access fail to register\n", __func__); | |
eccb6638 | 199 | return ret; |
8b7cfbec SJ |
200 | out_strtoint: |
201 | dev_err(chip->dev, "%s: fail to change str to int\n", __func__); | |
eccb6638 | 202 | return ret; |
8b7cfbec SJ |
203 | } |
204 | ||
5cce0105 | 205 | static DEVICE_ATTR(torch_pin, S_IWUSR, NULL, lm3642_torch_pin_store); |
8b7cfbec | 206 | |
bb58cc81 | 207 | static int lm3642_torch_brightness_set(struct led_classdev *cdev, |
8b7cfbec SJ |
208 | enum led_brightness brightness) |
209 | { | |
210 | struct lm3642_chip_data *chip = | |
211 | container_of(cdev, struct lm3642_chip_data, cdev_torch); | |
bb58cc81 | 212 | int ret; |
8b7cfbec | 213 | |
bb58cc81 | 214 | mutex_lock(&chip->lock); |
8b7cfbec | 215 | chip->br_torch = brightness; |
bb58cc81 AL |
216 | ret = lm3642_control(chip, chip->br_torch, MODES_TORCH); |
217 | mutex_unlock(&chip->lock); | |
218 | return ret; | |
8b7cfbec SJ |
219 | } |
220 | ||
221 | /* flash */ | |
222 | ||
223 | /* strobe pin config for lm3642*/ | |
224 | static ssize_t lm3642_strobe_pin_store(struct device *dev, | |
85b4b756 | 225 | struct device_attribute *attr, |
8b7cfbec SJ |
226 | const char *buf, size_t size) |
227 | { | |
228 | ssize_t ret; | |
229 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
230 | struct lm3642_chip_data *chip = | |
231 | container_of(led_cdev, struct lm3642_chip_data, cdev_indicator); | |
232 | unsigned int state; | |
233 | ||
234 | ret = kstrtouint(buf, 10, &state); | |
235 | if (ret) | |
236 | goto out_strtoint; | |
237 | if (state != 0) | |
238 | state = 0x01 << STROBE_PIN_EN_SHIFT; | |
239 | ||
240 | chip->strobe_pin = state; | |
241 | ret = regmap_update_bits(chip->regmap, REG_ENABLE, | |
242 | STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT, | |
243 | state); | |
244 | if (ret < 0) | |
245 | goto out; | |
246 | ||
247 | return size; | |
248 | out: | |
249 | dev_err(chip->dev, "%s:i2c access fail to register\n", __func__); | |
eccb6638 | 250 | return ret; |
8b7cfbec SJ |
251 | out_strtoint: |
252 | dev_err(chip->dev, "%s: fail to change str to int\n", __func__); | |
eccb6638 | 253 | return ret; |
8b7cfbec SJ |
254 | } |
255 | ||
5cce0105 | 256 | static DEVICE_ATTR(strobe_pin, S_IWUSR, NULL, lm3642_strobe_pin_store); |
8b7cfbec | 257 | |
bb58cc81 | 258 | static int lm3642_strobe_brightness_set(struct led_classdev *cdev, |
8b7cfbec SJ |
259 | enum led_brightness brightness) |
260 | { | |
261 | struct lm3642_chip_data *chip = | |
262 | container_of(cdev, struct lm3642_chip_data, cdev_flash); | |
bb58cc81 | 263 | int ret; |
8b7cfbec SJ |
264 | |
265 | mutex_lock(&chip->lock); | |
bb58cc81 AL |
266 | chip->br_flash = brightness; |
267 | ret = lm3642_control(chip, chip->br_flash, MODES_FLASH); | |
8b7cfbec | 268 | mutex_unlock(&chip->lock); |
bb58cc81 | 269 | return ret; |
8b7cfbec SJ |
270 | } |
271 | ||
bb58cc81 AL |
272 | /* indicator */ |
273 | static int lm3642_indicator_brightness_set(struct led_classdev *cdev, | |
8b7cfbec SJ |
274 | enum led_brightness brightness) |
275 | { | |
276 | struct lm3642_chip_data *chip = | |
277 | container_of(cdev, struct lm3642_chip_data, cdev_indicator); | |
bb58cc81 | 278 | int ret; |
8b7cfbec | 279 | |
bb58cc81 | 280 | mutex_lock(&chip->lock); |
8b7cfbec | 281 | chip->br_indicator = brightness; |
bb58cc81 AL |
282 | ret = lm3642_control(chip, chip->br_indicator, MODES_INDIC); |
283 | mutex_unlock(&chip->lock); | |
284 | return ret; | |
8b7cfbec SJ |
285 | } |
286 | ||
287 | static const struct regmap_config lm3642_regmap = { | |
288 | .reg_bits = 8, | |
289 | .val_bits = 8, | |
290 | .max_register = REG_MAX, | |
291 | }; | |
292 | ||
fe29a3b0 JH |
293 | static struct attribute *lm3642_flash_attrs[] = { |
294 | &dev_attr_strobe_pin.attr, | |
295 | NULL | |
296 | }; | |
297 | ATTRIBUTE_GROUPS(lm3642_flash); | |
298 | ||
299 | static struct attribute *lm3642_torch_attrs[] = { | |
300 | &dev_attr_torch_pin.attr, | |
301 | NULL | |
302 | }; | |
303 | ATTRIBUTE_GROUPS(lm3642_torch); | |
304 | ||
98ea1ea2 | 305 | static int lm3642_probe(struct i2c_client *client, |
8b7cfbec SJ |
306 | const struct i2c_device_id *id) |
307 | { | |
87aae1ea | 308 | struct lm3642_platform_data *pdata = dev_get_platdata(&client->dev); |
8b7cfbec SJ |
309 | struct lm3642_chip_data *chip; |
310 | ||
311 | int err; | |
312 | ||
313 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { | |
314 | dev_err(&client->dev, "i2c functionality check fail.\n"); | |
315 | return -EOPNOTSUPP; | |
316 | } | |
317 | ||
318 | if (pdata == NULL) { | |
319 | dev_err(&client->dev, "needs Platform Data.\n"); | |
320 | return -ENODATA; | |
321 | } | |
322 | ||
323 | chip = devm_kzalloc(&client->dev, | |
324 | sizeof(struct lm3642_chip_data), GFP_KERNEL); | |
325 | if (!chip) | |
326 | return -ENOMEM; | |
327 | ||
328 | chip->dev = &client->dev; | |
329 | chip->pdata = pdata; | |
330 | ||
331 | chip->tx_pin = pdata->tx_pin; | |
332 | chip->torch_pin = pdata->torch_pin; | |
333 | chip->strobe_pin = pdata->strobe_pin; | |
334 | ||
335 | chip->regmap = devm_regmap_init_i2c(client, &lm3642_regmap); | |
336 | if (IS_ERR(chip->regmap)) { | |
337 | err = PTR_ERR(chip->regmap); | |
338 | dev_err(&client->dev, "Failed to allocate register map: %d\n", | |
339 | err); | |
340 | return err; | |
341 | } | |
342 | ||
343 | mutex_init(&chip->lock); | |
344 | i2c_set_clientdata(client, chip); | |
345 | ||
346 | err = lm3642_chip_init(chip); | |
347 | if (err < 0) | |
348 | goto err_out; | |
349 | ||
350 | /* flash */ | |
8b7cfbec SJ |
351 | chip->cdev_flash.name = "flash"; |
352 | chip->cdev_flash.max_brightness = 16; | |
bb58cc81 | 353 | chip->cdev_flash.brightness_set_blocking = lm3642_strobe_brightness_set; |
313bf0b1 | 354 | chip->cdev_flash.default_trigger = "flash"; |
fe29a3b0 | 355 | chip->cdev_flash.groups = lm3642_flash_groups, |
8b7cfbec SJ |
356 | err = led_classdev_register((struct device *) |
357 | &client->dev, &chip->cdev_flash); | |
358 | if (err < 0) { | |
359 | dev_err(chip->dev, "failed to register flash\n"); | |
360 | goto err_out; | |
361 | } | |
8b7cfbec SJ |
362 | |
363 | /* torch */ | |
8b7cfbec SJ |
364 | chip->cdev_torch.name = "torch"; |
365 | chip->cdev_torch.max_brightness = 8; | |
bb58cc81 | 366 | chip->cdev_torch.brightness_set_blocking = lm3642_torch_brightness_set; |
313bf0b1 | 367 | chip->cdev_torch.default_trigger = "torch"; |
fe29a3b0 | 368 | chip->cdev_torch.groups = lm3642_torch_groups, |
8b7cfbec SJ |
369 | err = led_classdev_register((struct device *) |
370 | &client->dev, &chip->cdev_torch); | |
371 | if (err < 0) { | |
372 | dev_err(chip->dev, "failed to register torch\n"); | |
373 | goto err_create_torch_file; | |
374 | } | |
8b7cfbec SJ |
375 | |
376 | /* indicator */ | |
8b7cfbec SJ |
377 | chip->cdev_indicator.name = "indicator"; |
378 | chip->cdev_indicator.max_brightness = 8; | |
bb58cc81 AL |
379 | chip->cdev_indicator.brightness_set_blocking = |
380 | lm3642_indicator_brightness_set; | |
8b7cfbec SJ |
381 | err = led_classdev_register((struct device *) |
382 | &client->dev, &chip->cdev_indicator); | |
383 | if (err < 0) { | |
384 | dev_err(chip->dev, "failed to register indicator\n"); | |
385 | goto err_create_indicator_file; | |
386 | } | |
387 | ||
388 | dev_info(&client->dev, "LM3642 is initialized\n"); | |
389 | return 0; | |
390 | ||
391 | err_create_indicator_file: | |
8b7cfbec SJ |
392 | led_classdev_unregister(&chip->cdev_torch); |
393 | err_create_torch_file: | |
8b7cfbec SJ |
394 | led_classdev_unregister(&chip->cdev_flash); |
395 | err_out: | |
396 | return err; | |
397 | } | |
398 | ||
678e8a6b | 399 | static int lm3642_remove(struct i2c_client *client) |
8b7cfbec SJ |
400 | { |
401 | struct lm3642_chip_data *chip = i2c_get_clientdata(client); | |
402 | ||
403 | led_classdev_unregister(&chip->cdev_indicator); | |
8b7cfbec | 404 | led_classdev_unregister(&chip->cdev_torch); |
8b7cfbec | 405 | led_classdev_unregister(&chip->cdev_flash); |
8b7cfbec SJ |
406 | regmap_write(chip->regmap, REG_ENABLE, 0); |
407 | return 0; | |
408 | } | |
409 | ||
410 | static const struct i2c_device_id lm3642_id[] = { | |
411 | {LM3642_NAME, 0}, | |
412 | {} | |
413 | }; | |
414 | ||
415 | MODULE_DEVICE_TABLE(i2c, lm3642_id); | |
416 | ||
417 | static struct i2c_driver lm3642_i2c_driver = { | |
418 | .driver = { | |
419 | .name = LM3642_NAME, | |
8b7cfbec SJ |
420 | .pm = NULL, |
421 | }, | |
422 | .probe = lm3642_probe, | |
df07cf81 | 423 | .remove = lm3642_remove, |
8b7cfbec SJ |
424 | .id_table = lm3642_id, |
425 | }; | |
426 | ||
427 | module_i2c_driver(lm3642_i2c_driver); | |
428 | ||
429 | MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3642"); | |
430 | MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>"); | |
431 | MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>"); | |
432 | MODULE_LICENSE("GPL v2"); |