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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
8b7cfbec SJ |
2 | /* |
3 | * Simple driver for Texas Instruments LM3642 LED Flash driver chip | |
4 | * Copyright (C) 2012 Texas Instruments | |
8b7cfbec SJ |
5 | */ |
6 | #include <linux/module.h> | |
7 | #include <linux/delay.h> | |
8 | #include <linux/i2c.h> | |
9 | #include <linux/leds.h> | |
10 | #include <linux/slab.h> | |
11 | #include <linux/platform_device.h> | |
12 | #include <linux/fs.h> | |
13 | #include <linux/regmap.h> | |
8b7cfbec SJ |
14 | #include <linux/platform_data/leds-lm3642.h> |
15 | ||
16 | #define REG_FILT_TIME (0x0) | |
17 | #define REG_IVFM_MODE (0x1) | |
18 | #define REG_TORCH_TIME (0x6) | |
19 | #define REG_FLASH (0x8) | |
20 | #define REG_I_CTRL (0x9) | |
21 | #define REG_ENABLE (0xA) | |
22 | #define REG_FLAG (0xB) | |
23 | #define REG_MAX (0xB) | |
24 | ||
25 | #define UVLO_EN_SHIFT (7) | |
26 | #define IVM_D_TH_SHIFT (2) | |
27 | #define TORCH_RAMP_UP_TIME_SHIFT (3) | |
28 | #define TORCH_RAMP_DN_TIME_SHIFT (0) | |
29 | #define INDUCTOR_I_LIMIT_SHIFT (6) | |
30 | #define FLASH_RAMP_TIME_SHIFT (3) | |
31 | #define FLASH_TOUT_TIME_SHIFT (0) | |
32 | #define TORCH_I_SHIFT (4) | |
33 | #define FLASH_I_SHIFT (0) | |
34 | #define IVFM_SHIFT (7) | |
35 | #define TX_PIN_EN_SHIFT (6) | |
36 | #define STROBE_PIN_EN_SHIFT (5) | |
37 | #define TORCH_PIN_EN_SHIFT (4) | |
38 | #define MODE_BITS_SHIFT (0) | |
39 | ||
40 | #define UVLO_EN_MASK (0x1) | |
41 | #define IVM_D_TH_MASK (0x7) | |
42 | #define TORCH_RAMP_UP_TIME_MASK (0x7) | |
43 | #define TORCH_RAMP_DN_TIME_MASK (0x7) | |
44 | #define INDUCTOR_I_LIMIT_MASK (0x1) | |
45 | #define FLASH_RAMP_TIME_MASK (0x7) | |
46 | #define FLASH_TOUT_TIME_MASK (0x7) | |
47 | #define TORCH_I_MASK (0x7) | |
48 | #define FLASH_I_MASK (0xF) | |
49 | #define IVFM_MASK (0x1) | |
50 | #define TX_PIN_EN_MASK (0x1) | |
51 | #define STROBE_PIN_EN_MASK (0x1) | |
52 | #define TORCH_PIN_EN_MASK (0x1) | |
53 | #define MODE_BITS_MASK (0x73) | |
54 | #define EX_PIN_CONTROL_MASK (0x71) | |
55 | #define EX_PIN_ENABLE_MASK (0x70) | |
56 | ||
57 | enum lm3642_mode { | |
58 | MODES_STASNDBY = 0, | |
59 | MODES_INDIC, | |
60 | MODES_TORCH, | |
61 | MODES_FLASH | |
62 | }; | |
63 | ||
64 | struct lm3642_chip_data { | |
65 | struct device *dev; | |
66 | ||
67 | struct led_classdev cdev_flash; | |
68 | struct led_classdev cdev_torch; | |
69 | struct led_classdev cdev_indicator; | |
70 | ||
8b7cfbec SJ |
71 | u8 br_flash; |
72 | u8 br_torch; | |
73 | u8 br_indicator; | |
74 | ||
75 | enum lm3642_torch_pin_enable torch_pin; | |
76 | enum lm3642_strobe_pin_enable strobe_pin; | |
77 | enum lm3642_tx_pin_enable tx_pin; | |
78 | ||
79 | struct lm3642_platform_data *pdata; | |
80 | struct regmap *regmap; | |
81 | struct mutex lock; | |
82 | ||
83 | unsigned int last_flag; | |
84 | }; | |
85 | ||
86 | /* chip initialize */ | |
98ea1ea2 | 87 | static int lm3642_chip_init(struct lm3642_chip_data *chip) |
8b7cfbec | 88 | { |
8b7cfbec SJ |
89 | int ret; |
90 | struct lm3642_platform_data *pdata = chip->pdata; | |
91 | ||
92 | /* set enable register */ | |
e76a322a AL |
93 | ret = regmap_update_bits(chip->regmap, REG_ENABLE, EX_PIN_ENABLE_MASK, |
94 | pdata->tx_pin); | |
8b7cfbec | 95 | if (ret < 0) |
e76a322a | 96 | dev_err(chip->dev, "Failed to update REG_ENABLE Register\n"); |
8b7cfbec SJ |
97 | return ret; |
98 | } | |
99 | ||
100 | /* chip control */ | |
101 | static int lm3642_control(struct lm3642_chip_data *chip, | |
102 | u8 brightness, enum lm3642_mode opmode) | |
103 | { | |
104 | int ret; | |
105 | ||
106 | ret = regmap_read(chip->regmap, REG_FLAG, &chip->last_flag); | |
107 | if (ret < 0) { | |
108 | dev_err(chip->dev, "Failed to read REG_FLAG Register\n"); | |
867b6824 | 109 | return ret; |
8b7cfbec SJ |
110 | } |
111 | ||
112 | if (chip->last_flag) | |
113 | dev_info(chip->dev, "Last FLAG is 0x%x\n", chip->last_flag); | |
114 | ||
115 | /* brightness 0 means off-state */ | |
116 | if (!brightness) | |
117 | opmode = MODES_STASNDBY; | |
118 | ||
119 | switch (opmode) { | |
120 | case MODES_TORCH: | |
121 | ret = regmap_update_bits(chip->regmap, REG_I_CTRL, | |
122 | TORCH_I_MASK << TORCH_I_SHIFT, | |
123 | (brightness - 1) << TORCH_I_SHIFT); | |
124 | ||
125 | if (chip->torch_pin) | |
126 | opmode |= (TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT); | |
127 | break; | |
128 | ||
129 | case MODES_FLASH: | |
130 | ret = regmap_update_bits(chip->regmap, REG_I_CTRL, | |
131 | FLASH_I_MASK << FLASH_I_SHIFT, | |
132 | (brightness - 1) << FLASH_I_SHIFT); | |
133 | ||
134 | if (chip->strobe_pin) | |
135 | opmode |= (STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT); | |
136 | break; | |
137 | ||
138 | case MODES_INDIC: | |
139 | ret = regmap_update_bits(chip->regmap, REG_I_CTRL, | |
140 | TORCH_I_MASK << TORCH_I_SHIFT, | |
141 | (brightness - 1) << TORCH_I_SHIFT); | |
142 | break; | |
143 | ||
144 | case MODES_STASNDBY: | |
145 | ||
146 | break; | |
147 | ||
148 | default: | |
867b6824 | 149 | return -EINVAL; |
8b7cfbec SJ |
150 | } |
151 | if (ret < 0) { | |
152 | dev_err(chip->dev, "Failed to write REG_I_CTRL Register\n"); | |
867b6824 | 153 | return ret; |
8b7cfbec SJ |
154 | } |
155 | ||
156 | if (chip->tx_pin) | |
157 | opmode |= (TX_PIN_EN_MASK << TX_PIN_EN_SHIFT); | |
158 | ||
159 | ret = regmap_update_bits(chip->regmap, REG_ENABLE, | |
160 | MODE_BITS_MASK << MODE_BITS_SHIFT, | |
161 | opmode << MODE_BITS_SHIFT); | |
8b7cfbec SJ |
162 | return ret; |
163 | } | |
164 | ||
165 | /* torch */ | |
166 | ||
867b6824 | 167 | /* torch pin config for lm3642 */ |
5ccfa39d DR |
168 | static ssize_t torch_pin_store(struct device *dev, |
169 | struct device_attribute *attr, | |
170 | const char *buf, size_t size) | |
8b7cfbec SJ |
171 | { |
172 | ssize_t ret; | |
173 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
174 | struct lm3642_chip_data *chip = | |
175 | container_of(led_cdev, struct lm3642_chip_data, cdev_indicator); | |
176 | unsigned int state; | |
177 | ||
178 | ret = kstrtouint(buf, 10, &state); | |
179 | if (ret) | |
867b6824 | 180 | return ret; |
8b7cfbec SJ |
181 | if (state != 0) |
182 | state = 0x01 << TORCH_PIN_EN_SHIFT; | |
183 | ||
184 | chip->torch_pin = state; | |
185 | ret = regmap_update_bits(chip->regmap, REG_ENABLE, | |
186 | TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT, | |
187 | state); | |
867b6824 PM |
188 | if (ret < 0) { |
189 | dev_err(chip->dev, "%s:i2c access fail to register\n", __func__); | |
190 | return ret; | |
191 | } | |
8b7cfbec SJ |
192 | |
193 | return size; | |
8b7cfbec SJ |
194 | } |
195 | ||
5ccfa39d | 196 | static DEVICE_ATTR_WO(torch_pin); |
8b7cfbec | 197 | |
bb58cc81 | 198 | static int lm3642_torch_brightness_set(struct led_classdev *cdev, |
8b7cfbec SJ |
199 | enum led_brightness brightness) |
200 | { | |
201 | struct lm3642_chip_data *chip = | |
202 | container_of(cdev, struct lm3642_chip_data, cdev_torch); | |
bb58cc81 | 203 | int ret; |
8b7cfbec | 204 | |
bb58cc81 | 205 | mutex_lock(&chip->lock); |
8b7cfbec | 206 | chip->br_torch = brightness; |
bb58cc81 AL |
207 | ret = lm3642_control(chip, chip->br_torch, MODES_TORCH); |
208 | mutex_unlock(&chip->lock); | |
209 | return ret; | |
8b7cfbec SJ |
210 | } |
211 | ||
212 | /* flash */ | |
213 | ||
214 | /* strobe pin config for lm3642*/ | |
5ccfa39d DR |
215 | static ssize_t strobe_pin_store(struct device *dev, |
216 | struct device_attribute *attr, | |
217 | const char *buf, size_t size) | |
8b7cfbec SJ |
218 | { |
219 | ssize_t ret; | |
220 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
221 | struct lm3642_chip_data *chip = | |
222 | container_of(led_cdev, struct lm3642_chip_data, cdev_indicator); | |
223 | unsigned int state; | |
224 | ||
225 | ret = kstrtouint(buf, 10, &state); | |
226 | if (ret) | |
867b6824 | 227 | return ret; |
8b7cfbec SJ |
228 | if (state != 0) |
229 | state = 0x01 << STROBE_PIN_EN_SHIFT; | |
230 | ||
231 | chip->strobe_pin = state; | |
232 | ret = regmap_update_bits(chip->regmap, REG_ENABLE, | |
233 | STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT, | |
234 | state); | |
867b6824 PM |
235 | if (ret < 0) { |
236 | dev_err(chip->dev, "%s:i2c access fail to register\n", __func__); | |
237 | return ret; | |
238 | } | |
8b7cfbec SJ |
239 | |
240 | return size; | |
8b7cfbec SJ |
241 | } |
242 | ||
5ccfa39d | 243 | static DEVICE_ATTR_WO(strobe_pin); |
8b7cfbec | 244 | |
bb58cc81 | 245 | static int lm3642_strobe_brightness_set(struct led_classdev *cdev, |
8b7cfbec SJ |
246 | enum led_brightness brightness) |
247 | { | |
248 | struct lm3642_chip_data *chip = | |
249 | container_of(cdev, struct lm3642_chip_data, cdev_flash); | |
bb58cc81 | 250 | int ret; |
8b7cfbec SJ |
251 | |
252 | mutex_lock(&chip->lock); | |
bb58cc81 AL |
253 | chip->br_flash = brightness; |
254 | ret = lm3642_control(chip, chip->br_flash, MODES_FLASH); | |
8b7cfbec | 255 | mutex_unlock(&chip->lock); |
bb58cc81 | 256 | return ret; |
8b7cfbec SJ |
257 | } |
258 | ||
bb58cc81 AL |
259 | /* indicator */ |
260 | static int lm3642_indicator_brightness_set(struct led_classdev *cdev, | |
8b7cfbec SJ |
261 | enum led_brightness brightness) |
262 | { | |
263 | struct lm3642_chip_data *chip = | |
264 | container_of(cdev, struct lm3642_chip_data, cdev_indicator); | |
bb58cc81 | 265 | int ret; |
8b7cfbec | 266 | |
bb58cc81 | 267 | mutex_lock(&chip->lock); |
8b7cfbec | 268 | chip->br_indicator = brightness; |
bb58cc81 AL |
269 | ret = lm3642_control(chip, chip->br_indicator, MODES_INDIC); |
270 | mutex_unlock(&chip->lock); | |
271 | return ret; | |
8b7cfbec SJ |
272 | } |
273 | ||
274 | static const struct regmap_config lm3642_regmap = { | |
275 | .reg_bits = 8, | |
276 | .val_bits = 8, | |
277 | .max_register = REG_MAX, | |
278 | }; | |
279 | ||
fe29a3b0 JH |
280 | static struct attribute *lm3642_flash_attrs[] = { |
281 | &dev_attr_strobe_pin.attr, | |
282 | NULL | |
283 | }; | |
284 | ATTRIBUTE_GROUPS(lm3642_flash); | |
285 | ||
286 | static struct attribute *lm3642_torch_attrs[] = { | |
287 | &dev_attr_torch_pin.attr, | |
288 | NULL | |
289 | }; | |
290 | ATTRIBUTE_GROUPS(lm3642_torch); | |
291 | ||
98ea1ea2 | 292 | static int lm3642_probe(struct i2c_client *client, |
8b7cfbec SJ |
293 | const struct i2c_device_id *id) |
294 | { | |
87aae1ea | 295 | struct lm3642_platform_data *pdata = dev_get_platdata(&client->dev); |
8b7cfbec SJ |
296 | struct lm3642_chip_data *chip; |
297 | ||
298 | int err; | |
299 | ||
300 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { | |
301 | dev_err(&client->dev, "i2c functionality check fail.\n"); | |
302 | return -EOPNOTSUPP; | |
303 | } | |
304 | ||
305 | if (pdata == NULL) { | |
306 | dev_err(&client->dev, "needs Platform Data.\n"); | |
307 | return -ENODATA; | |
308 | } | |
309 | ||
310 | chip = devm_kzalloc(&client->dev, | |
311 | sizeof(struct lm3642_chip_data), GFP_KERNEL); | |
312 | if (!chip) | |
313 | return -ENOMEM; | |
314 | ||
315 | chip->dev = &client->dev; | |
316 | chip->pdata = pdata; | |
317 | ||
318 | chip->tx_pin = pdata->tx_pin; | |
319 | chip->torch_pin = pdata->torch_pin; | |
320 | chip->strobe_pin = pdata->strobe_pin; | |
321 | ||
322 | chip->regmap = devm_regmap_init_i2c(client, &lm3642_regmap); | |
323 | if (IS_ERR(chip->regmap)) { | |
324 | err = PTR_ERR(chip->regmap); | |
325 | dev_err(&client->dev, "Failed to allocate register map: %d\n", | |
326 | err); | |
327 | return err; | |
328 | } | |
329 | ||
330 | mutex_init(&chip->lock); | |
331 | i2c_set_clientdata(client, chip); | |
332 | ||
333 | err = lm3642_chip_init(chip); | |
334 | if (err < 0) | |
335 | goto err_out; | |
336 | ||
337 | /* flash */ | |
8b7cfbec SJ |
338 | chip->cdev_flash.name = "flash"; |
339 | chip->cdev_flash.max_brightness = 16; | |
bb58cc81 | 340 | chip->cdev_flash.brightness_set_blocking = lm3642_strobe_brightness_set; |
313bf0b1 | 341 | chip->cdev_flash.default_trigger = "flash"; |
fcc96cef | 342 | chip->cdev_flash.groups = lm3642_flash_groups; |
b5684a73 | 343 | err = led_classdev_register(&client->dev, &chip->cdev_flash); |
8b7cfbec SJ |
344 | if (err < 0) { |
345 | dev_err(chip->dev, "failed to register flash\n"); | |
346 | goto err_out; | |
347 | } | |
8b7cfbec SJ |
348 | |
349 | /* torch */ | |
8b7cfbec SJ |
350 | chip->cdev_torch.name = "torch"; |
351 | chip->cdev_torch.max_brightness = 8; | |
bb58cc81 | 352 | chip->cdev_torch.brightness_set_blocking = lm3642_torch_brightness_set; |
313bf0b1 | 353 | chip->cdev_torch.default_trigger = "torch"; |
fcc96cef | 354 | chip->cdev_torch.groups = lm3642_torch_groups; |
b5684a73 | 355 | err = led_classdev_register(&client->dev, &chip->cdev_torch); |
8b7cfbec SJ |
356 | if (err < 0) { |
357 | dev_err(chip->dev, "failed to register torch\n"); | |
358 | goto err_create_torch_file; | |
359 | } | |
8b7cfbec SJ |
360 | |
361 | /* indicator */ | |
8b7cfbec SJ |
362 | chip->cdev_indicator.name = "indicator"; |
363 | chip->cdev_indicator.max_brightness = 8; | |
bb58cc81 AL |
364 | chip->cdev_indicator.brightness_set_blocking = |
365 | lm3642_indicator_brightness_set; | |
b5684a73 | 366 | err = led_classdev_register(&client->dev, &chip->cdev_indicator); |
8b7cfbec SJ |
367 | if (err < 0) { |
368 | dev_err(chip->dev, "failed to register indicator\n"); | |
369 | goto err_create_indicator_file; | |
370 | } | |
371 | ||
372 | dev_info(&client->dev, "LM3642 is initialized\n"); | |
373 | return 0; | |
374 | ||
375 | err_create_indicator_file: | |
8b7cfbec SJ |
376 | led_classdev_unregister(&chip->cdev_torch); |
377 | err_create_torch_file: | |
8b7cfbec SJ |
378 | led_classdev_unregister(&chip->cdev_flash); |
379 | err_out: | |
380 | return err; | |
381 | } | |
382 | ||
678e8a6b | 383 | static int lm3642_remove(struct i2c_client *client) |
8b7cfbec SJ |
384 | { |
385 | struct lm3642_chip_data *chip = i2c_get_clientdata(client); | |
386 | ||
387 | led_classdev_unregister(&chip->cdev_indicator); | |
8b7cfbec | 388 | led_classdev_unregister(&chip->cdev_torch); |
8b7cfbec | 389 | led_classdev_unregister(&chip->cdev_flash); |
8b7cfbec SJ |
390 | regmap_write(chip->regmap, REG_ENABLE, 0); |
391 | return 0; | |
392 | } | |
393 | ||
394 | static const struct i2c_device_id lm3642_id[] = { | |
395 | {LM3642_NAME, 0}, | |
396 | {} | |
397 | }; | |
398 | ||
399 | MODULE_DEVICE_TABLE(i2c, lm3642_id); | |
400 | ||
401 | static struct i2c_driver lm3642_i2c_driver = { | |
402 | .driver = { | |
403 | .name = LM3642_NAME, | |
8b7cfbec SJ |
404 | .pm = NULL, |
405 | }, | |
406 | .probe = lm3642_probe, | |
df07cf81 | 407 | .remove = lm3642_remove, |
8b7cfbec SJ |
408 | .id_table = lm3642_id, |
409 | }; | |
410 | ||
411 | module_i2c_driver(lm3642_i2c_driver); | |
412 | ||
413 | MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3642"); | |
414 | MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>"); | |
415 | MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>"); | |
416 | MODULE_LICENSE("GPL v2"); |