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8ab6abfc AR |
1 | /* |
2 | * Copyright (c) 2015 Intel Corporation | |
3 | * | |
4 | * Driver for TXC PA12203001 Proximity and Ambient Light Sensor. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License version 2 as published by | |
8 | * the Free Software Foundation. | |
9 | * To do: Interrupt support. | |
10 | */ | |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/acpi.h> | |
15 | #include <linux/delay.h> | |
16 | #include <linux/i2c.h> | |
17 | #include <linux/iio/iio.h> | |
18 | #include <linux/iio/sysfs.h> | |
19 | #include <linux/mutex.h> | |
20 | #include <linux/pm.h> | |
21 | #include <linux/pm_runtime.h> | |
22 | #include <linux/regmap.h> | |
23 | ||
24 | #define PA12203001_DRIVER_NAME "pa12203001" | |
25 | ||
26 | #define PA12203001_REG_CFG0 0x00 | |
27 | #define PA12203001_REG_CFG1 0x01 | |
28 | #define PA12203001_REG_CFG2 0x02 | |
29 | #define PA12203001_REG_CFG3 0x03 | |
30 | ||
31 | #define PA12203001_REG_ADL 0x0b | |
32 | #define PA12203001_REG_PDH 0x0e | |
33 | ||
34 | #define PA12203001_REG_POFS 0x10 | |
35 | #define PA12203001_REG_PSET 0x11 | |
36 | ||
37 | #define PA12203001_ALS_EN_MASK BIT(0) | |
38 | #define PA12203001_PX_EN_MASK BIT(1) | |
39 | #define PA12203001_PX_NORMAL_MODE_MASK GENMASK(7, 6) | |
40 | #define PA12203001_AFSR_MASK GENMASK(5, 4) | |
41 | #define PA12203001_AFSR_SHIFT 4 | |
42 | ||
43 | #define PA12203001_PSCAN 0x03 | |
44 | ||
45 | /* als range 31000, ps, als disabled */ | |
46 | #define PA12203001_REG_CFG0_DEFAULT 0x30 | |
47 | ||
48 | /* led current: 100 mA */ | |
49 | #define PA12203001_REG_CFG1_DEFAULT 0x20 | |
50 | ||
51 | /* ps mode: normal, interrupts not active */ | |
52 | #define PA12203001_REG_CFG2_DEFAULT 0xcc | |
53 | ||
54 | #define PA12203001_REG_CFG3_DEFAULT 0x00 | |
55 | ||
56 | #define PA12203001_SLEEP_DELAY_MS 3000 | |
57 | ||
58 | #define PA12203001_CHIP_ENABLE 0xff | |
59 | #define PA12203001_CHIP_DISABLE 0x00 | |
60 | ||
61 | /* available scales: corresponding to [500, 4000, 7000, 31000] lux */ | |
62 | static const int pa12203001_scales[] = { 7629, 61036, 106813, 473029}; | |
63 | ||
64 | struct pa12203001_data { | |
65 | struct i2c_client *client; | |
66 | ||
67 | /* protect device states */ | |
68 | struct mutex lock; | |
69 | ||
70 | bool als_enabled; | |
71 | bool px_enabled; | |
72 | bool als_needs_enable; | |
73 | bool px_needs_enable; | |
74 | ||
75 | struct regmap *map; | |
76 | }; | |
77 | ||
78 | static const struct { | |
79 | u8 reg; | |
80 | u8 val; | |
81 | } regvals[] = { | |
82 | {PA12203001_REG_CFG0, PA12203001_REG_CFG0_DEFAULT}, | |
83 | {PA12203001_REG_CFG1, PA12203001_REG_CFG1_DEFAULT}, | |
84 | {PA12203001_REG_CFG2, PA12203001_REG_CFG2_DEFAULT}, | |
85 | {PA12203001_REG_CFG3, PA12203001_REG_CFG3_DEFAULT}, | |
86 | {PA12203001_REG_PSET, PA12203001_PSCAN}, | |
87 | }; | |
88 | ||
89 | static IIO_CONST_ATTR(in_illuminance_scale_available, | |
90 | "0.007629 0.061036 0.106813 0.473029"); | |
91 | ||
92 | static struct attribute *pa12203001_attrs[] = { | |
93 | &iio_const_attr_in_illuminance_scale_available.dev_attr.attr, | |
94 | NULL | |
95 | }; | |
96 | ||
97 | static const struct attribute_group pa12203001_attr_group = { | |
98 | .attrs = pa12203001_attrs, | |
99 | }; | |
100 | ||
101 | static const struct iio_chan_spec pa12203001_channels[] = { | |
102 | { | |
103 | .type = IIO_LIGHT, | |
104 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | | |
105 | BIT(IIO_CHAN_INFO_SCALE), | |
106 | }, | |
107 | { | |
108 | .type = IIO_PROXIMITY, | |
109 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), | |
110 | } | |
111 | }; | |
112 | ||
113 | static const struct regmap_range pa12203001_volatile_regs_ranges[] = { | |
114 | regmap_reg_range(PA12203001_REG_ADL, PA12203001_REG_ADL + 1), | |
115 | regmap_reg_range(PA12203001_REG_PDH, PA12203001_REG_PDH), | |
116 | }; | |
117 | ||
118 | static const struct regmap_access_table pa12203001_volatile_regs = { | |
119 | .yes_ranges = pa12203001_volatile_regs_ranges, | |
120 | .n_yes_ranges = ARRAY_SIZE(pa12203001_volatile_regs_ranges), | |
121 | }; | |
122 | ||
123 | static const struct regmap_config pa12203001_regmap_config = { | |
124 | .reg_bits = 8, | |
125 | .val_bits = 8, | |
126 | .max_register = PA12203001_REG_PSET, | |
127 | .cache_type = REGCACHE_RBTREE, | |
128 | .volatile_table = &pa12203001_volatile_regs, | |
129 | }; | |
130 | ||
131 | static inline int pa12203001_als_enable(struct pa12203001_data *data, u8 enable) | |
132 | { | |
133 | int ret; | |
134 | ||
135 | ret = regmap_update_bits(data->map, PA12203001_REG_CFG0, | |
136 | PA12203001_ALS_EN_MASK, enable); | |
137 | if (ret < 0) | |
138 | return ret; | |
139 | ||
140 | data->als_enabled = !!enable; | |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
145 | static inline int pa12203001_px_enable(struct pa12203001_data *data, u8 enable) | |
146 | { | |
147 | int ret; | |
148 | ||
149 | ret = regmap_update_bits(data->map, PA12203001_REG_CFG0, | |
150 | PA12203001_PX_EN_MASK, enable); | |
151 | if (ret < 0) | |
152 | return ret; | |
153 | ||
154 | data->px_enabled = !!enable; | |
155 | ||
156 | return 0; | |
157 | } | |
158 | ||
159 | static int pa12203001_set_power_state(struct pa12203001_data *data, bool on, | |
160 | u8 mask) | |
161 | { | |
162 | #ifdef CONFIG_PM | |
163 | int ret; | |
164 | ||
165 | if (on && (mask & PA12203001_ALS_EN_MASK)) { | |
166 | mutex_lock(&data->lock); | |
167 | if (data->px_enabled) { | |
168 | ret = pa12203001_als_enable(data, | |
169 | PA12203001_ALS_EN_MASK); | |
170 | if (ret < 0) | |
171 | goto err; | |
172 | } else { | |
173 | data->als_needs_enable = true; | |
174 | } | |
175 | mutex_unlock(&data->lock); | |
176 | } | |
177 | ||
178 | if (on && (mask & PA12203001_PX_EN_MASK)) { | |
179 | mutex_lock(&data->lock); | |
180 | if (data->als_enabled) { | |
181 | ret = pa12203001_px_enable(data, PA12203001_PX_EN_MASK); | |
182 | if (ret < 0) | |
183 | goto err; | |
184 | } else { | |
185 | data->px_needs_enable = true; | |
186 | } | |
187 | mutex_unlock(&data->lock); | |
188 | } | |
189 | ||
190 | if (on) { | |
191 | ret = pm_runtime_get_sync(&data->client->dev); | |
192 | if (ret < 0) | |
193 | pm_runtime_put_noidle(&data->client->dev); | |
194 | ||
195 | } else { | |
196 | pm_runtime_mark_last_busy(&data->client->dev); | |
197 | ret = pm_runtime_put_autosuspend(&data->client->dev); | |
198 | } | |
199 | ||
200 | return ret; | |
201 | ||
202 | err: | |
203 | mutex_unlock(&data->lock); | |
204 | return ret; | |
205 | ||
206 | #endif | |
207 | return 0; | |
208 | } | |
209 | ||
210 | static int pa12203001_read_raw(struct iio_dev *indio_dev, | |
211 | struct iio_chan_spec const *chan, int *val, | |
212 | int *val2, long mask) | |
213 | { | |
214 | struct pa12203001_data *data = iio_priv(indio_dev); | |
215 | int ret; | |
216 | u8 dev_mask; | |
217 | unsigned int reg_byte; | |
218 | __le16 reg_word; | |
219 | ||
220 | switch (mask) { | |
221 | case IIO_CHAN_INFO_RAW: | |
222 | switch (chan->type) { | |
223 | case IIO_LIGHT: | |
224 | dev_mask = PA12203001_ALS_EN_MASK; | |
225 | ret = pa12203001_set_power_state(data, true, dev_mask); | |
226 | if (ret < 0) | |
227 | return ret; | |
228 | /* | |
229 | * ALS ADC value is stored in registers | |
230 | * PA12203001_REG_ADL and in PA12203001_REG_ADL + 1. | |
231 | */ | |
232 | ret = regmap_bulk_read(data->map, PA12203001_REG_ADL, | |
233 | ®_word, 2); | |
234 | if (ret < 0) | |
235 | goto reg_err; | |
236 | ||
237 | *val = le16_to_cpu(reg_word); | |
238 | ret = pa12203001_set_power_state(data, false, dev_mask); | |
239 | if (ret < 0) | |
240 | return ret; | |
241 | break; | |
242 | case IIO_PROXIMITY: | |
243 | dev_mask = PA12203001_PX_EN_MASK; | |
244 | ret = pa12203001_set_power_state(data, true, dev_mask); | |
245 | if (ret < 0) | |
246 | return ret; | |
247 | ret = regmap_read(data->map, PA12203001_REG_PDH, | |
248 | ®_byte); | |
249 | if (ret < 0) | |
250 | goto reg_err; | |
251 | ||
252 | *val = reg_byte; | |
253 | ret = pa12203001_set_power_state(data, false, dev_mask); | |
254 | if (ret < 0) | |
255 | return ret; | |
256 | break; | |
257 | default: | |
258 | return -EINVAL; | |
259 | } | |
260 | return IIO_VAL_INT; | |
261 | case IIO_CHAN_INFO_SCALE: | |
262 | ret = regmap_read(data->map, PA12203001_REG_CFG0, ®_byte); | |
263 | if (ret < 0) | |
264 | return ret; | |
265 | *val = 0; | |
266 | reg_byte = (reg_byte & PA12203001_AFSR_MASK); | |
267 | *val2 = pa12203001_scales[reg_byte >> 4]; | |
268 | return IIO_VAL_INT_PLUS_MICRO; | |
269 | default: | |
270 | return -EINVAL; | |
271 | } | |
272 | ||
273 | reg_err: | |
274 | pa12203001_set_power_state(data, false, dev_mask); | |
275 | return ret; | |
276 | } | |
277 | ||
278 | static int pa12203001_write_raw(struct iio_dev *indio_dev, | |
279 | struct iio_chan_spec const *chan, int val, | |
280 | int val2, long mask) | |
281 | { | |
282 | struct pa12203001_data *data = iio_priv(indio_dev); | |
283 | int i, ret, new_val; | |
284 | unsigned int reg_byte; | |
285 | ||
286 | switch (mask) { | |
287 | case IIO_CHAN_INFO_SCALE: | |
288 | ret = regmap_read(data->map, PA12203001_REG_CFG0, ®_byte); | |
289 | if (val != 0 || ret < 0) | |
290 | return -EINVAL; | |
291 | for (i = 0; i < ARRAY_SIZE(pa12203001_scales); i++) { | |
292 | if (val2 == pa12203001_scales[i]) { | |
293 | new_val = i << PA12203001_AFSR_SHIFT; | |
294 | return regmap_update_bits(data->map, | |
295 | PA12203001_REG_CFG0, | |
296 | PA12203001_AFSR_MASK, | |
297 | new_val); | |
298 | } | |
299 | } | |
300 | break; | |
301 | default: | |
302 | break; | |
303 | } | |
304 | ||
305 | return -EINVAL; | |
306 | } | |
307 | ||
308 | static const struct iio_info pa12203001_info = { | |
8ab6abfc AR |
309 | .read_raw = pa12203001_read_raw, |
310 | .write_raw = pa12203001_write_raw, | |
311 | .attrs = &pa12203001_attr_group, | |
312 | }; | |
313 | ||
314 | static int pa12203001_init(struct iio_dev *indio_dev) | |
315 | { | |
316 | struct pa12203001_data *data = iio_priv(indio_dev); | |
317 | int i, ret; | |
318 | ||
319 | for (i = 0; i < ARRAY_SIZE(regvals); i++) { | |
320 | ret = regmap_write(data->map, regvals[i].reg, regvals[i].val); | |
321 | if (ret < 0) | |
322 | return ret; | |
323 | } | |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
328 | static int pa12203001_power_chip(struct iio_dev *indio_dev, u8 state) | |
329 | { | |
330 | struct pa12203001_data *data = iio_priv(indio_dev); | |
331 | int ret; | |
332 | ||
333 | mutex_lock(&data->lock); | |
334 | ret = pa12203001_als_enable(data, state); | |
335 | if (ret < 0) | |
336 | goto out; | |
337 | ||
338 | ret = pa12203001_px_enable(data, state); | |
339 | ||
340 | out: | |
341 | mutex_unlock(&data->lock); | |
342 | return ret; | |
343 | } | |
344 | ||
345 | static int pa12203001_probe(struct i2c_client *client, | |
346 | const struct i2c_device_id *id) | |
347 | { | |
348 | struct pa12203001_data *data; | |
349 | struct iio_dev *indio_dev; | |
350 | int ret; | |
351 | ||
352 | indio_dev = devm_iio_device_alloc(&client->dev, | |
353 | sizeof(struct pa12203001_data)); | |
354 | if (!indio_dev) | |
355 | return -ENOMEM; | |
356 | ||
357 | data = iio_priv(indio_dev); | |
358 | i2c_set_clientdata(client, indio_dev); | |
359 | data->client = client; | |
360 | ||
361 | data->map = devm_regmap_init_i2c(client, &pa12203001_regmap_config); | |
362 | if (IS_ERR(data->map)) | |
363 | return PTR_ERR(data->map); | |
364 | ||
365 | mutex_init(&data->lock); | |
366 | ||
367 | indio_dev->dev.parent = &client->dev; | |
368 | indio_dev->info = &pa12203001_info; | |
369 | indio_dev->name = PA12203001_DRIVER_NAME; | |
370 | indio_dev->channels = pa12203001_channels; | |
371 | indio_dev->num_channels = ARRAY_SIZE(pa12203001_channels); | |
372 | indio_dev->modes = INDIO_DIRECT_MODE; | |
373 | ||
374 | ret = pa12203001_init(indio_dev); | |
375 | if (ret < 0) | |
376 | return ret; | |
377 | ||
378 | ret = pa12203001_power_chip(indio_dev, PA12203001_CHIP_ENABLE); | |
379 | if (ret < 0) | |
380 | return ret; | |
381 | ||
382 | ret = pm_runtime_set_active(&client->dev); | |
536bbca7 AR |
383 | if (ret < 0) |
384 | goto out_err; | |
8ab6abfc AR |
385 | |
386 | pm_runtime_enable(&client->dev); | |
387 | pm_runtime_set_autosuspend_delay(&client->dev, | |
388 | PA12203001_SLEEP_DELAY_MS); | |
389 | pm_runtime_use_autosuspend(&client->dev); | |
390 | ||
536bbca7 AR |
391 | ret = iio_device_register(indio_dev); |
392 | if (ret < 0) | |
393 | goto out_err; | |
394 | ||
395 | return 0; | |
396 | ||
397 | out_err: | |
398 | pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE); | |
399 | return ret; | |
8ab6abfc AR |
400 | } |
401 | ||
402 | static int pa12203001_remove(struct i2c_client *client) | |
403 | { | |
404 | struct iio_dev *indio_dev = i2c_get_clientdata(client); | |
405 | ||
406 | iio_device_unregister(indio_dev); | |
407 | ||
408 | pm_runtime_disable(&client->dev); | |
409 | pm_runtime_set_suspended(&client->dev); | |
410 | ||
411 | return pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE); | |
412 | } | |
413 | ||
414 | #if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM) | |
415 | static int pa12203001_suspend(struct device *dev) | |
416 | { | |
417 | struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); | |
418 | ||
419 | return pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE); | |
420 | } | |
421 | #endif | |
422 | ||
423 | #ifdef CONFIG_PM_SLEEP | |
424 | static int pa12203001_resume(struct device *dev) | |
425 | { | |
426 | struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); | |
427 | ||
428 | return pa12203001_power_chip(indio_dev, PA12203001_CHIP_ENABLE); | |
429 | } | |
430 | #endif | |
431 | ||
432 | #ifdef CONFIG_PM | |
433 | static int pa12203001_runtime_resume(struct device *dev) | |
434 | { | |
435 | struct pa12203001_data *data; | |
436 | ||
437 | data = iio_priv(i2c_get_clientdata(to_i2c_client(dev))); | |
438 | ||
439 | mutex_lock(&data->lock); | |
440 | if (data->als_needs_enable) { | |
441 | pa12203001_als_enable(data, PA12203001_ALS_EN_MASK); | |
442 | data->als_needs_enable = false; | |
443 | } | |
444 | if (data->px_needs_enable) { | |
445 | pa12203001_px_enable(data, PA12203001_PX_EN_MASK); | |
446 | data->px_needs_enable = false; | |
447 | } | |
448 | mutex_unlock(&data->lock); | |
449 | ||
450 | return 0; | |
451 | } | |
452 | #endif | |
453 | ||
454 | static const struct dev_pm_ops pa12203001_pm_ops = { | |
455 | SET_SYSTEM_SLEEP_PM_OPS(pa12203001_suspend, pa12203001_resume) | |
456 | SET_RUNTIME_PM_OPS(pa12203001_suspend, pa12203001_runtime_resume, NULL) | |
457 | }; | |
458 | ||
459 | static const struct acpi_device_id pa12203001_acpi_match[] = { | |
460 | { "TXCPA122", 0}, | |
461 | {} | |
462 | }; | |
463 | ||
464 | MODULE_DEVICE_TABLE(acpi, pa12203001_acpi_match); | |
465 | ||
466 | static const struct i2c_device_id pa12203001_id[] = { | |
467 | {"txcpa122", 0}, | |
468 | {} | |
469 | }; | |
470 | ||
471 | MODULE_DEVICE_TABLE(i2c, pa12203001_id); | |
472 | ||
473 | static struct i2c_driver pa12203001_driver = { | |
474 | .driver = { | |
475 | .name = PA12203001_DRIVER_NAME, | |
476 | .pm = &pa12203001_pm_ops, | |
477 | .acpi_match_table = ACPI_PTR(pa12203001_acpi_match), | |
478 | }, | |
479 | .probe = pa12203001_probe, | |
480 | .remove = pa12203001_remove, | |
481 | .id_table = pa12203001_id, | |
482 | ||
483 | }; | |
484 | module_i2c_driver(pa12203001_driver); | |
485 | ||
486 | MODULE_AUTHOR("Adriana Reus <adriana.reus@intel.com>"); | |
487 | MODULE_DESCRIPTION("Driver for TXC PA12203001 Proximity and Light Sensor"); | |
488 | MODULE_LICENSE("GPL v2"); |