1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * RPR-0521 ROHM Ambient Light and Proximity Sensor |
4 | * |
5 | * Copyright (c) 2015, Intel Corporation. |
6 | * |
7 | * IIO driver for RPR-0521RS (7-bit I2C slave address 0x38). |
8 | * |
9 | * TODO: illuminance channel |
10 | */ |
11 | |
12 | #include <linux/module.h> |
13 | #include <linux/init.h> |
14 | #include <linux/i2c.h> |
15 | #include <linux/regmap.h> |
16 | #include <linux/delay.h> |
17 | #include <linux/acpi.h> |
18 | |
19 | #include <linux/iio/iio.h> |
20 | #include <linux/iio/buffer.h> |
21 | #include <linux/iio/trigger.h> |
22 | #include <linux/iio/trigger_consumer.h> |
23 | #include <linux/iio/triggered_buffer.h> |
24 | #include <linux/iio/sysfs.h> |
25 | #include <linux/pm_runtime.h> |
26 | |
27 | #define RPR0521_REG_SYSTEM_CTRL 0x40 |
28 | #define RPR0521_REG_MODE_CTRL 0x41 |
29 | #define RPR0521_REG_ALS_CTRL 0x42 |
30 | #define RPR0521_REG_PXS_CTRL 0x43 |
31 | #define RPR0521_REG_PXS_DATA 0x44 /* 16-bit, little endian */ |
32 | #define RPR0521_REG_ALS_DATA0 0x46 /* 16-bit, little endian */ |
33 | #define RPR0521_REG_ALS_DATA1 0x48 /* 16-bit, little endian */ |
34 | #define RPR0521_REG_INTERRUPT 0x4A |
35 | #define RPR0521_REG_PS_OFFSET_LSB 0x53 |
36 | #define RPR0521_REG_ID 0x92 |
37 | |
38 | #define RPR0521_MODE_ALS_MASK BIT(7) |
39 | #define RPR0521_MODE_PXS_MASK BIT(6) |
40 | #define RPR0521_MODE_MEAS_TIME_MASK GENMASK(3, 0) |
41 | #define RPR0521_ALS_DATA0_GAIN_MASK GENMASK(5, 4) |
42 | #define RPR0521_ALS_DATA0_GAIN_SHIFT 4 |
43 | #define RPR0521_ALS_DATA1_GAIN_MASK GENMASK(3, 2) |
44 | #define RPR0521_ALS_DATA1_GAIN_SHIFT 2 |
45 | #define RPR0521_PXS_GAIN_MASK GENMASK(5, 4) |
46 | #define RPR0521_PXS_GAIN_SHIFT 4 |
47 | #define RPR0521_PXS_PERSISTENCE_MASK GENMASK(3, 0) |
48 | #define RPR0521_INTERRUPT_INT_TRIG_PS_MASK BIT(0) |
49 | #define RPR0521_INTERRUPT_INT_TRIG_ALS_MASK BIT(1) |
50 | #define RPR0521_INTERRUPT_INT_REASSERT_MASK BIT(3) |
51 | #define RPR0521_INTERRUPT_ALS_INT_STATUS_MASK BIT(6) |
52 | #define RPR0521_INTERRUPT_PS_INT_STATUS_MASK BIT(7) |
53 | |
54 | #define RPR0521_MODE_ALS_ENABLE BIT(7) |
55 | #define RPR0521_MODE_ALS_DISABLE 0x00 |
56 | #define RPR0521_MODE_PXS_ENABLE BIT(6) |
57 | #define RPR0521_MODE_PXS_DISABLE 0x00 |
58 | #define RPR0521_PXS_PERSISTENCE_DRDY 0x00 |
59 | |
60 | #define RPR0521_INTERRUPT_INT_TRIG_PS_ENABLE BIT(0) |
61 | #define RPR0521_INTERRUPT_INT_TRIG_PS_DISABLE 0x00 |
62 | #define RPR0521_INTERRUPT_INT_TRIG_ALS_ENABLE BIT(1) |
63 | #define RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE 0x00 |
64 | #define RPR0521_INTERRUPT_INT_REASSERT_ENABLE BIT(3) |
65 | #define RPR0521_INTERRUPT_INT_REASSERT_DISABLE 0x00 |
66 | |
67 | #define RPR0521_MANUFACT_ID 0xE0 |
68 | #define RPR0521_DEFAULT_MEAS_TIME 0x06 /* ALS - 100ms, PXS - 100ms */ |
69 | |
70 | #define RPR0521_DRV_NAME "RPR0521" |
71 | #define RPR0521_IRQ_NAME "rpr0521_event" |
72 | #define RPR0521_REGMAP_NAME "rpr0521_regmap" |
73 | |
74 | #define RPR0521_SLEEP_DELAY_MS 2000 |
75 | |
76 | #define RPR0521_ALS_SCALE_AVAIL "0.007812 0.015625 0.5 1" |
77 | #define RPR0521_PXS_SCALE_AVAIL "0.125 0.5 1" |
78 | |
79 | struct rpr0521_gain { |
80 | int scale; |
81 | int uscale; |
82 | }; |
83 | |
84 | static const struct rpr0521_gain rpr0521_als_gain[4] = { |
85 | {1, 0}, /* x1 */ |
86 | {0, 500000}, /* x2 */ |
87 | {0, 15625}, /* x64 */ |
88 | {0, 7812}, /* x128 */ |
89 | }; |
90 | |
91 | static const struct rpr0521_gain rpr0521_pxs_gain[3] = { |
92 | {1, 0}, /* x1 */ |
93 | {0, 500000}, /* x2 */ |
94 | {0, 125000}, /* x4 */ |
95 | }; |
96 | |
97 | enum rpr0521_channel { |
98 | RPR0521_CHAN_PXS, |
99 | RPR0521_CHAN_ALS_DATA0, |
100 | RPR0521_CHAN_ALS_DATA1, |
101 | }; |
102 | |
103 | struct rpr0521_reg_desc { |
104 | u8 address; |
105 | u8 device_mask; |
106 | }; |
107 | |
108 | static const struct rpr0521_reg_desc rpr0521_data_reg[] = { |
109 | [RPR0521_CHAN_PXS] = { |
110 | .address = RPR0521_REG_PXS_DATA, |
111 | .device_mask = RPR0521_MODE_PXS_MASK, |
112 | }, |
113 | [RPR0521_CHAN_ALS_DATA0] = { |
114 | .address = RPR0521_REG_ALS_DATA0, |
115 | .device_mask = RPR0521_MODE_ALS_MASK, |
116 | }, |
117 | [RPR0521_CHAN_ALS_DATA1] = { |
118 | .address = RPR0521_REG_ALS_DATA1, |
119 | .device_mask = RPR0521_MODE_ALS_MASK, |
120 | }, |
121 | }; |
122 | |
123 | static const struct rpr0521_gain_info { |
124 | u8 reg; |
125 | u8 mask; |
126 | u8 shift; |
127 | const struct rpr0521_gain *gain; |
128 | int size; |
129 | } rpr0521_gain[] = { |
130 | [RPR0521_CHAN_PXS] = { |
131 | .reg = RPR0521_REG_PXS_CTRL, |
132 | .mask = RPR0521_PXS_GAIN_MASK, |
133 | .shift = RPR0521_PXS_GAIN_SHIFT, |
134 | .gain = rpr0521_pxs_gain, |
135 | .size = ARRAY_SIZE(rpr0521_pxs_gain), |
136 | }, |
137 | [RPR0521_CHAN_ALS_DATA0] = { |
138 | .reg = RPR0521_REG_ALS_CTRL, |
139 | .mask = RPR0521_ALS_DATA0_GAIN_MASK, |
140 | .shift = RPR0521_ALS_DATA0_GAIN_SHIFT, |
141 | .gain = rpr0521_als_gain, |
142 | .size = ARRAY_SIZE(rpr0521_als_gain), |
143 | }, |
144 | [RPR0521_CHAN_ALS_DATA1] = { |
145 | .reg = RPR0521_REG_ALS_CTRL, |
146 | .mask = RPR0521_ALS_DATA1_GAIN_MASK, |
147 | .shift = RPR0521_ALS_DATA1_GAIN_SHIFT, |
148 | .gain = rpr0521_als_gain, |
149 | .size = ARRAY_SIZE(rpr0521_als_gain), |
150 | }, |
151 | }; |
152 | |
153 | struct rpr0521_samp_freq { |
154 | int als_hz; |
155 | int als_uhz; |
156 | int pxs_hz; |
157 | int pxs_uhz; |
158 | }; |
159 | |
160 | static const struct rpr0521_samp_freq rpr0521_samp_freq_i[13] = { |
161 | /* {ALS, PXS}, W==currently writable option */ |
162 | {0, 0, 0, 0}, /* W0000, 0=standby */ |
163 | {0, 0, 100, 0}, /* 0001 */ |
164 | {0, 0, 25, 0}, /* 0010 */ |
165 | {0, 0, 10, 0}, /* 0011 */ |
166 | {0, 0, 2, 500000}, /* 0100 */ |
167 | {10, 0, 20, 0}, /* 0101 */ |
168 | {10, 0, 10, 0}, /* W0110 */ |
169 | {10, 0, 2, 500000}, /* 0111 */ |
170 | {2, 500000, 20, 0}, /* 1000, measurement 100ms, sleep 300ms */ |
171 | {2, 500000, 10, 0}, /* 1001, measurement 100ms, sleep 300ms */ |
172 | {2, 500000, 0, 0}, /* 1010, high sensitivity mode */ |
173 | {2, 500000, 2, 500000}, /* W1011, high sensitivity mode */ |
174 | {20, 0, 20, 0} /* 1100, ALS_data x 0.5, see specification P.18 */ |
175 | }; |
176 | |
177 | struct rpr0521_data { |
178 | struct i2c_client *client; |
179 | |
180 | /* protect device params updates (e.g state, gain) */ |
181 | struct mutex lock; |
182 | |
183 | /* device active status */ |
184 | bool als_dev_en; |
185 | bool pxs_dev_en; |
186 | |
187 | struct iio_trigger *drdy_trigger0; |
188 | s64 irq_timestamp; |
189 | |
190 | /* optimize runtime pm ops - enable/disable device only if needed */ |
191 | bool als_ps_need_en; |
192 | bool pxs_ps_need_en; |
193 | bool als_need_dis; |
194 | bool pxs_need_dis; |
195 | |
196 | struct regmap *regmap; |
197 | |
198 | /* |
199 | * Ensure correct naturally aligned timestamp. |
200 | * Note that the read will put garbage data into |
201 | * the padding but this should not be a problem |
202 | */ |
203 | struct { |
204 | __le16 channels[3]; |
205 | u8 garbage; |
206 | s64 ts __aligned(8); |
207 | } scan; |
208 | }; |
209 | |
210 | static IIO_CONST_ATTR(in_intensity_scale_available, RPR0521_ALS_SCALE_AVAIL); |
211 | static IIO_CONST_ATTR(in_proximity_scale_available, RPR0521_PXS_SCALE_AVAIL); |
212 | |
213 | /* |
214 | * Start with easy freq first, whole table of freq combinations is more |
215 | * complicated. |
216 | */ |
217 | static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("2.5 10" ); |
218 | |
219 | static struct attribute *rpr0521_attributes[] = { |
220 | &iio_const_attr_in_intensity_scale_available.dev_attr.attr, |
221 | &iio_const_attr_in_proximity_scale_available.dev_attr.attr, |
222 | &iio_const_attr_sampling_frequency_available.dev_attr.attr, |
223 | NULL, |
224 | }; |
225 | |
226 | static const struct attribute_group rpr0521_attribute_group = { |
227 | .attrs = rpr0521_attributes, |
228 | }; |
229 | |
230 | /* Order of the channel data in buffer */ |
231 | enum rpr0521_scan_index_order { |
232 | RPR0521_CHAN_INDEX_PXS, |
233 | RPR0521_CHAN_INDEX_BOTH, |
234 | RPR0521_CHAN_INDEX_IR, |
235 | }; |
236 | |
237 | static const unsigned long rpr0521_available_scan_masks[] = { |
238 | BIT(RPR0521_CHAN_INDEX_PXS) | BIT(RPR0521_CHAN_INDEX_BOTH) | |
239 | BIT(RPR0521_CHAN_INDEX_IR), |
240 | 0 |
241 | }; |
242 | |
243 | static const struct iio_chan_spec rpr0521_channels[] = { |
244 | { |
245 | .type = IIO_PROXIMITY, |
246 | .address = RPR0521_CHAN_PXS, |
247 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | |
248 | BIT(IIO_CHAN_INFO_OFFSET) | |
249 | BIT(IIO_CHAN_INFO_SCALE), |
250 | .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), |
251 | .scan_index = RPR0521_CHAN_INDEX_PXS, |
252 | .scan_type = { |
253 | .sign = 'u', |
254 | .realbits = 16, |
255 | .storagebits = 16, |
256 | .endianness = IIO_LE, |
257 | }, |
258 | }, |
259 | { |
260 | .type = IIO_INTENSITY, |
261 | .modified = 1, |
262 | .address = RPR0521_CHAN_ALS_DATA0, |
263 | .channel2 = IIO_MOD_LIGHT_BOTH, |
264 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | |
265 | BIT(IIO_CHAN_INFO_SCALE), |
266 | .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), |
267 | .scan_index = RPR0521_CHAN_INDEX_BOTH, |
268 | .scan_type = { |
269 | .sign = 'u', |
270 | .realbits = 16, |
271 | .storagebits = 16, |
272 | .endianness = IIO_LE, |
273 | }, |
274 | }, |
275 | { |
276 | .type = IIO_INTENSITY, |
277 | .modified = 1, |
278 | .address = RPR0521_CHAN_ALS_DATA1, |
279 | .channel2 = IIO_MOD_LIGHT_IR, |
280 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | |
281 | BIT(IIO_CHAN_INFO_SCALE), |
282 | .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), |
283 | .scan_index = RPR0521_CHAN_INDEX_IR, |
284 | .scan_type = { |
285 | .sign = 'u', |
286 | .realbits = 16, |
287 | .storagebits = 16, |
288 | .endianness = IIO_LE, |
289 | }, |
290 | }, |
291 | }; |
292 | |
293 | static int rpr0521_als_enable(struct rpr0521_data *data, u8 status) |
294 | { |
295 | int ret; |
296 | |
297 | ret = regmap_update_bits(map: data->regmap, RPR0521_REG_MODE_CTRL, |
298 | RPR0521_MODE_ALS_MASK, |
299 | val: status); |
300 | if (ret < 0) |
301 | return ret; |
302 | |
303 | if (status & RPR0521_MODE_ALS_MASK) |
304 | data->als_dev_en = true; |
305 | else |
306 | data->als_dev_en = false; |
307 | |
308 | return 0; |
309 | } |
310 | |
311 | static int rpr0521_pxs_enable(struct rpr0521_data *data, u8 status) |
312 | { |
313 | int ret; |
314 | |
315 | ret = regmap_update_bits(map: data->regmap, RPR0521_REG_MODE_CTRL, |
316 | RPR0521_MODE_PXS_MASK, |
317 | val: status); |
318 | if (ret < 0) |
319 | return ret; |
320 | |
321 | if (status & RPR0521_MODE_PXS_MASK) |
322 | data->pxs_dev_en = true; |
323 | else |
324 | data->pxs_dev_en = false; |
325 | |
326 | return 0; |
327 | } |
328 | |
329 | /** |
330 | * rpr0521_set_power_state - handles runtime PM state and sensors enabled status |
331 | * |
332 | * @data: rpr0521 device private data |
333 | * @on: state to be set for devices in @device_mask |
334 | * @device_mask: bitmask specifying for which device we need to update @on state |
335 | * |
336 | * Calls for this function must be balanced so that each ON should have matching |
337 | * OFF. Otherwise pm usage_count gets out of sync. |
338 | */ |
339 | static int rpr0521_set_power_state(struct rpr0521_data *data, bool on, |
340 | u8 device_mask) |
341 | { |
342 | #ifdef CONFIG_PM |
343 | int ret; |
344 | |
345 | if (device_mask & RPR0521_MODE_ALS_MASK) { |
346 | data->als_ps_need_en = on; |
347 | data->als_need_dis = !on; |
348 | } |
349 | |
350 | if (device_mask & RPR0521_MODE_PXS_MASK) { |
351 | data->pxs_ps_need_en = on; |
352 | data->pxs_need_dis = !on; |
353 | } |
354 | |
355 | /* |
356 | * On: _resume() is called only when we are suspended |
357 | * Off: _suspend() is called after delay if _resume() is not |
358 | * called before that. |
359 | * Note: If either measurement is re-enabled before _suspend(), |
360 | * both stay enabled until _suspend(). |
361 | */ |
362 | if (on) { |
363 | ret = pm_runtime_resume_and_get(dev: &data->client->dev); |
364 | } else { |
365 | pm_runtime_mark_last_busy(dev: &data->client->dev); |
366 | ret = pm_runtime_put_autosuspend(dev: &data->client->dev); |
367 | } |
368 | if (ret < 0) { |
369 | dev_err(&data->client->dev, |
370 | "Failed: rpr0521_set_power_state for %d, ret %d\n" , |
371 | on, ret); |
372 | return ret; |
373 | } |
374 | |
375 | if (on) { |
376 | /* If _resume() was not called, enable measurement now. */ |
377 | if (data->als_ps_need_en) { |
378 | ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE); |
379 | if (ret) |
380 | return ret; |
381 | data->als_ps_need_en = false; |
382 | } |
383 | |
384 | if (data->pxs_ps_need_en) { |
385 | ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE); |
386 | if (ret) |
387 | return ret; |
388 | data->pxs_ps_need_en = false; |
389 | } |
390 | } |
391 | #endif |
392 | return 0; |
393 | } |
394 | |
395 | /* Interrupt register tells if this sensor caused the interrupt or not. */ |
396 | static inline bool rpr0521_is_triggered(struct rpr0521_data *data) |
397 | { |
398 | int ret; |
399 | int reg; |
400 | |
401 | ret = regmap_read(map: data->regmap, RPR0521_REG_INTERRUPT, val: ®); |
402 | if (ret < 0) |
403 | return false; /* Reg read failed. */ |
404 | if (reg & |
405 | (RPR0521_INTERRUPT_ALS_INT_STATUS_MASK | |
406 | RPR0521_INTERRUPT_PS_INT_STATUS_MASK)) |
407 | return true; |
408 | else |
409 | return false; /* Int not from this sensor. */ |
410 | } |
411 | |
412 | /* IRQ to trigger handler */ |
413 | static irqreturn_t rpr0521_drdy_irq_handler(int irq, void *private) |
414 | { |
415 | struct iio_dev *indio_dev = private; |
416 | struct rpr0521_data *data = iio_priv(indio_dev); |
417 | |
418 | data->irq_timestamp = iio_get_time_ns(indio_dev); |
419 | /* |
420 | * We need to wake the thread to read the interrupt reg. It |
421 | * is not possible to do that here because regmap_read takes a |
422 | * mutex. |
423 | */ |
424 | |
425 | return IRQ_WAKE_THREAD; |
426 | } |
427 | |
428 | static irqreturn_t rpr0521_drdy_irq_thread(int irq, void *private) |
429 | { |
430 | struct iio_dev *indio_dev = private; |
431 | struct rpr0521_data *data = iio_priv(indio_dev); |
432 | |
433 | if (rpr0521_is_triggered(data)) { |
434 | iio_trigger_poll_nested(trig: data->drdy_trigger0); |
435 | return IRQ_HANDLED; |
436 | } |
437 | |
438 | return IRQ_NONE; |
439 | } |
440 | |
441 | static irqreturn_t rpr0521_trigger_consumer_store_time(int irq, void *p) |
442 | { |
443 | struct iio_poll_func *pf = p; |
444 | struct iio_dev *indio_dev = pf->indio_dev; |
445 | |
446 | /* Other trigger polls store time here. */ |
447 | if (!iio_trigger_using_own(indio_dev)) |
448 | pf->timestamp = iio_get_time_ns(indio_dev); |
449 | |
450 | return IRQ_WAKE_THREAD; |
451 | } |
452 | |
453 | static irqreturn_t rpr0521_trigger_consumer_handler(int irq, void *p) |
454 | { |
455 | struct iio_poll_func *pf = p; |
456 | struct iio_dev *indio_dev = pf->indio_dev; |
457 | struct rpr0521_data *data = iio_priv(indio_dev); |
458 | int err; |
459 | |
460 | /* Use irq timestamp when reasonable. */ |
461 | if (iio_trigger_using_own(indio_dev) && data->irq_timestamp) { |
462 | pf->timestamp = data->irq_timestamp; |
463 | data->irq_timestamp = 0; |
464 | } |
465 | /* Other chained trigger polls get timestamp only here. */ |
466 | if (!pf->timestamp) |
467 | pf->timestamp = iio_get_time_ns(indio_dev); |
468 | |
469 | err = regmap_bulk_read(map: data->regmap, RPR0521_REG_PXS_DATA, |
470 | val: data->scan.channels, |
471 | val_count: (3 * 2) + 1); /* 3 * 16-bit + (discarded) int clear reg. */ |
472 | if (!err) |
473 | iio_push_to_buffers_with_timestamp(indio_dev, |
474 | data: &data->scan, timestamp: pf->timestamp); |
475 | else |
476 | dev_err(&data->client->dev, |
477 | "Trigger consumer can't read from sensor.\n" ); |
478 | pf->timestamp = 0; |
479 | |
480 | iio_trigger_notify_done(trig: indio_dev->trig); |
481 | |
482 | return IRQ_HANDLED; |
483 | } |
484 | |
485 | static int rpr0521_write_int_enable(struct rpr0521_data *data) |
486 | { |
487 | int err; |
488 | |
489 | /* Interrupt after each measurement */ |
490 | err = regmap_update_bits(map: data->regmap, RPR0521_REG_PXS_CTRL, |
491 | RPR0521_PXS_PERSISTENCE_MASK, |
492 | RPR0521_PXS_PERSISTENCE_DRDY); |
493 | if (err) { |
494 | dev_err(&data->client->dev, "PS control reg write fail.\n" ); |
495 | return -EBUSY; |
496 | } |
497 | |
498 | /* Ignore latch and mode because of drdy */ |
499 | err = regmap_write(map: data->regmap, RPR0521_REG_INTERRUPT, |
500 | RPR0521_INTERRUPT_INT_REASSERT_DISABLE | |
501 | RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE | |
502 | RPR0521_INTERRUPT_INT_TRIG_PS_ENABLE |
503 | ); |
504 | if (err) { |
505 | dev_err(&data->client->dev, "Interrupt setup write fail.\n" ); |
506 | return -EBUSY; |
507 | } |
508 | |
509 | return 0; |
510 | } |
511 | |
512 | static int rpr0521_write_int_disable(struct rpr0521_data *data) |
513 | { |
514 | /* Don't care of clearing mode, assert and latch. */ |
515 | return regmap_write(map: data->regmap, RPR0521_REG_INTERRUPT, |
516 | RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE | |
517 | RPR0521_INTERRUPT_INT_TRIG_PS_DISABLE |
518 | ); |
519 | } |
520 | |
521 | /* |
522 | * Trigger producer enable / disable. Note that there will be trigs only when |
523 | * measurement data is ready to be read. |
524 | */ |
525 | static int rpr0521_pxs_drdy_set_state(struct iio_trigger *trigger, |
526 | bool enable_drdy) |
527 | { |
528 | struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig: trigger); |
529 | struct rpr0521_data *data = iio_priv(indio_dev); |
530 | int err; |
531 | |
532 | if (enable_drdy) |
533 | err = rpr0521_write_int_enable(data); |
534 | else |
535 | err = rpr0521_write_int_disable(data); |
536 | if (err) |
537 | dev_err(&data->client->dev, "rpr0521_pxs_drdy_set_state failed\n" ); |
538 | |
539 | return err; |
540 | } |
541 | |
542 | static const struct iio_trigger_ops rpr0521_trigger_ops = { |
543 | .set_trigger_state = rpr0521_pxs_drdy_set_state, |
544 | }; |
545 | |
546 | |
547 | static int rpr0521_buffer_preenable(struct iio_dev *indio_dev) |
548 | { |
549 | int err; |
550 | struct rpr0521_data *data = iio_priv(indio_dev); |
551 | |
552 | mutex_lock(&data->lock); |
553 | err = rpr0521_set_power_state(data, on: true, |
554 | device_mask: (RPR0521_MODE_PXS_MASK | RPR0521_MODE_ALS_MASK)); |
555 | mutex_unlock(lock: &data->lock); |
556 | if (err) |
557 | dev_err(&data->client->dev, "_buffer_preenable fail\n" ); |
558 | |
559 | return err; |
560 | } |
561 | |
562 | static int rpr0521_buffer_postdisable(struct iio_dev *indio_dev) |
563 | { |
564 | int err; |
565 | struct rpr0521_data *data = iio_priv(indio_dev); |
566 | |
567 | mutex_lock(&data->lock); |
568 | err = rpr0521_set_power_state(data, on: false, |
569 | device_mask: (RPR0521_MODE_PXS_MASK | RPR0521_MODE_ALS_MASK)); |
570 | mutex_unlock(lock: &data->lock); |
571 | if (err) |
572 | dev_err(&data->client->dev, "_buffer_postdisable fail\n" ); |
573 | |
574 | return err; |
575 | } |
576 | |
577 | static const struct iio_buffer_setup_ops rpr0521_buffer_setup_ops = { |
578 | .preenable = rpr0521_buffer_preenable, |
579 | .postdisable = rpr0521_buffer_postdisable, |
580 | }; |
581 | |
582 | static int rpr0521_get_gain(struct rpr0521_data *data, int chan, |
583 | int *val, int *val2) |
584 | { |
585 | int ret, reg, idx; |
586 | |
587 | ret = regmap_read(map: data->regmap, reg: rpr0521_gain[chan].reg, val: ®); |
588 | if (ret < 0) |
589 | return ret; |
590 | |
591 | idx = (rpr0521_gain[chan].mask & reg) >> rpr0521_gain[chan].shift; |
592 | *val = rpr0521_gain[chan].gain[idx].scale; |
593 | *val2 = rpr0521_gain[chan].gain[idx].uscale; |
594 | |
595 | return 0; |
596 | } |
597 | |
598 | static int rpr0521_set_gain(struct rpr0521_data *data, int chan, |
599 | int val, int val2) |
600 | { |
601 | int i, idx = -EINVAL; |
602 | |
603 | /* get gain index */ |
604 | for (i = 0; i < rpr0521_gain[chan].size; i++) |
605 | if (val == rpr0521_gain[chan].gain[i].scale && |
606 | val2 == rpr0521_gain[chan].gain[i].uscale) { |
607 | idx = i; |
608 | break; |
609 | } |
610 | |
611 | if (idx < 0) |
612 | return idx; |
613 | |
614 | return regmap_update_bits(map: data->regmap, reg: rpr0521_gain[chan].reg, |
615 | mask: rpr0521_gain[chan].mask, |
616 | val: idx << rpr0521_gain[chan].shift); |
617 | } |
618 | |
619 | static int rpr0521_read_samp_freq(struct rpr0521_data *data, |
620 | enum iio_chan_type chan_type, |
621 | int *val, int *val2) |
622 | { |
623 | int reg, ret; |
624 | |
625 | ret = regmap_read(map: data->regmap, RPR0521_REG_MODE_CTRL, val: ®); |
626 | if (ret < 0) |
627 | return ret; |
628 | |
629 | reg &= RPR0521_MODE_MEAS_TIME_MASK; |
630 | if (reg >= ARRAY_SIZE(rpr0521_samp_freq_i)) |
631 | return -EINVAL; |
632 | |
633 | switch (chan_type) { |
634 | case IIO_INTENSITY: |
635 | *val = rpr0521_samp_freq_i[reg].als_hz; |
636 | *val2 = rpr0521_samp_freq_i[reg].als_uhz; |
637 | return 0; |
638 | |
639 | case IIO_PROXIMITY: |
640 | *val = rpr0521_samp_freq_i[reg].pxs_hz; |
641 | *val2 = rpr0521_samp_freq_i[reg].pxs_uhz; |
642 | return 0; |
643 | |
644 | default: |
645 | return -EINVAL; |
646 | } |
647 | } |
648 | |
649 | static int rpr0521_write_samp_freq_common(struct rpr0521_data *data, |
650 | enum iio_chan_type chan_type, |
651 | int val, int val2) |
652 | { |
653 | int i; |
654 | |
655 | /* |
656 | * Ignore channel |
657 | * both pxs and als are setup only to same freq because of simplicity |
658 | */ |
659 | switch (val) { |
660 | case 0: |
661 | i = 0; |
662 | break; |
663 | |
664 | case 2: |
665 | if (val2 != 500000) |
666 | return -EINVAL; |
667 | |
668 | i = 11; |
669 | break; |
670 | |
671 | case 10: |
672 | i = 6; |
673 | break; |
674 | |
675 | default: |
676 | return -EINVAL; |
677 | } |
678 | |
679 | return regmap_update_bits(map: data->regmap, |
680 | RPR0521_REG_MODE_CTRL, |
681 | RPR0521_MODE_MEAS_TIME_MASK, |
682 | val: i); |
683 | } |
684 | |
685 | static int rpr0521_read_ps_offset(struct rpr0521_data *data, int *offset) |
686 | { |
687 | int ret; |
688 | __le16 buffer; |
689 | |
690 | ret = regmap_bulk_read(map: data->regmap, |
691 | RPR0521_REG_PS_OFFSET_LSB, val: &buffer, val_count: sizeof(buffer)); |
692 | |
693 | if (ret < 0) { |
694 | dev_err(&data->client->dev, "Failed to read PS OFFSET register\n" ); |
695 | return ret; |
696 | } |
697 | *offset = le16_to_cpu(buffer); |
698 | |
699 | return ret; |
700 | } |
701 | |
702 | static int rpr0521_write_ps_offset(struct rpr0521_data *data, int offset) |
703 | { |
704 | int ret; |
705 | __le16 buffer; |
706 | |
707 | buffer = cpu_to_le16(offset & 0x3ff); |
708 | ret = regmap_raw_write(map: data->regmap, |
709 | RPR0521_REG_PS_OFFSET_LSB, val: &buffer, val_len: sizeof(buffer)); |
710 | |
711 | if (ret < 0) { |
712 | dev_err(&data->client->dev, "Failed to write PS OFFSET register\n" ); |
713 | return ret; |
714 | } |
715 | |
716 | return ret; |
717 | } |
718 | |
719 | static int rpr0521_read_raw(struct iio_dev *indio_dev, |
720 | struct iio_chan_spec const *chan, int *val, |
721 | int *val2, long mask) |
722 | { |
723 | struct rpr0521_data *data = iio_priv(indio_dev); |
724 | int ret; |
725 | int busy; |
726 | u8 device_mask; |
727 | __le16 raw_data; |
728 | |
729 | switch (mask) { |
730 | case IIO_CHAN_INFO_RAW: |
731 | if (chan->type != IIO_INTENSITY && chan->type != IIO_PROXIMITY) |
732 | return -EINVAL; |
733 | |
734 | busy = iio_device_claim_direct_mode(indio_dev); |
735 | if (busy) |
736 | return -EBUSY; |
737 | |
738 | device_mask = rpr0521_data_reg[chan->address].device_mask; |
739 | |
740 | mutex_lock(&data->lock); |
741 | ret = rpr0521_set_power_state(data, on: true, device_mask); |
742 | if (ret < 0) |
743 | goto rpr0521_read_raw_out; |
744 | |
745 | ret = regmap_bulk_read(map: data->regmap, |
746 | reg: rpr0521_data_reg[chan->address].address, |
747 | val: &raw_data, val_count: sizeof(raw_data)); |
748 | if (ret < 0) { |
749 | rpr0521_set_power_state(data, on: false, device_mask); |
750 | goto rpr0521_read_raw_out; |
751 | } |
752 | |
753 | ret = rpr0521_set_power_state(data, on: false, device_mask); |
754 | |
755 | rpr0521_read_raw_out: |
756 | mutex_unlock(lock: &data->lock); |
757 | iio_device_release_direct_mode(indio_dev); |
758 | if (ret < 0) |
759 | return ret; |
760 | |
761 | *val = le16_to_cpu(raw_data); |
762 | |
763 | return IIO_VAL_INT; |
764 | |
765 | case IIO_CHAN_INFO_SCALE: |
766 | mutex_lock(&data->lock); |
767 | ret = rpr0521_get_gain(data, chan: chan->address, val, val2); |
768 | mutex_unlock(lock: &data->lock); |
769 | if (ret < 0) |
770 | return ret; |
771 | |
772 | return IIO_VAL_INT_PLUS_MICRO; |
773 | |
774 | case IIO_CHAN_INFO_SAMP_FREQ: |
775 | mutex_lock(&data->lock); |
776 | ret = rpr0521_read_samp_freq(data, chan_type: chan->type, val, val2); |
777 | mutex_unlock(lock: &data->lock); |
778 | if (ret < 0) |
779 | return ret; |
780 | |
781 | return IIO_VAL_INT_PLUS_MICRO; |
782 | |
783 | case IIO_CHAN_INFO_OFFSET: |
784 | mutex_lock(&data->lock); |
785 | ret = rpr0521_read_ps_offset(data, offset: val); |
786 | mutex_unlock(lock: &data->lock); |
787 | if (ret < 0) |
788 | return ret; |
789 | |
790 | return IIO_VAL_INT; |
791 | |
792 | default: |
793 | return -EINVAL; |
794 | } |
795 | } |
796 | |
797 | static int rpr0521_write_raw(struct iio_dev *indio_dev, |
798 | struct iio_chan_spec const *chan, int val, |
799 | int val2, long mask) |
800 | { |
801 | struct rpr0521_data *data = iio_priv(indio_dev); |
802 | int ret; |
803 | |
804 | switch (mask) { |
805 | case IIO_CHAN_INFO_SCALE: |
806 | mutex_lock(&data->lock); |
807 | ret = rpr0521_set_gain(data, chan: chan->address, val, val2); |
808 | mutex_unlock(lock: &data->lock); |
809 | |
810 | return ret; |
811 | |
812 | case IIO_CHAN_INFO_SAMP_FREQ: |
813 | mutex_lock(&data->lock); |
814 | ret = rpr0521_write_samp_freq_common(data, chan_type: chan->type, |
815 | val, val2); |
816 | mutex_unlock(lock: &data->lock); |
817 | |
818 | return ret; |
819 | |
820 | case IIO_CHAN_INFO_OFFSET: |
821 | mutex_lock(&data->lock); |
822 | ret = rpr0521_write_ps_offset(data, offset: val); |
823 | mutex_unlock(lock: &data->lock); |
824 | |
825 | return ret; |
826 | |
827 | default: |
828 | return -EINVAL; |
829 | } |
830 | } |
831 | |
832 | static const struct iio_info rpr0521_info = { |
833 | .read_raw = rpr0521_read_raw, |
834 | .write_raw = rpr0521_write_raw, |
835 | .attrs = &rpr0521_attribute_group, |
836 | }; |
837 | |
838 | static int rpr0521_init(struct rpr0521_data *data) |
839 | { |
840 | int ret; |
841 | int id; |
842 | |
843 | ret = regmap_read(map: data->regmap, RPR0521_REG_ID, val: &id); |
844 | if (ret < 0) { |
845 | dev_err(&data->client->dev, "Failed to read REG_ID register\n" ); |
846 | return ret; |
847 | } |
848 | |
849 | if (id != RPR0521_MANUFACT_ID) { |
850 | dev_err(&data->client->dev, "Wrong id, got %x, expected %x\n" , |
851 | id, RPR0521_MANUFACT_ID); |
852 | return -ENODEV; |
853 | } |
854 | |
855 | /* set default measurement time - 100 ms for both ALS and PS */ |
856 | ret = regmap_update_bits(map: data->regmap, RPR0521_REG_MODE_CTRL, |
857 | RPR0521_MODE_MEAS_TIME_MASK, |
858 | RPR0521_DEFAULT_MEAS_TIME); |
859 | if (ret) { |
860 | pr_err("regmap_update_bits returned %d\n" , ret); |
861 | return ret; |
862 | } |
863 | |
864 | #ifndef CONFIG_PM |
865 | ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE); |
866 | if (ret < 0) |
867 | return ret; |
868 | ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE); |
869 | if (ret < 0) |
870 | return ret; |
871 | #endif |
872 | |
873 | data->irq_timestamp = 0; |
874 | |
875 | return 0; |
876 | } |
877 | |
878 | static int rpr0521_poweroff(struct rpr0521_data *data) |
879 | { |
880 | int ret; |
881 | int tmp; |
882 | |
883 | ret = regmap_update_bits(map: data->regmap, RPR0521_REG_MODE_CTRL, |
884 | RPR0521_MODE_ALS_MASK | |
885 | RPR0521_MODE_PXS_MASK, |
886 | RPR0521_MODE_ALS_DISABLE | |
887 | RPR0521_MODE_PXS_DISABLE); |
888 | if (ret < 0) |
889 | return ret; |
890 | |
891 | data->als_dev_en = false; |
892 | data->pxs_dev_en = false; |
893 | |
894 | /* |
895 | * Int pin keeps state after power off. Set pin to high impedance |
896 | * mode to prevent power drain. |
897 | */ |
898 | ret = regmap_read(map: data->regmap, RPR0521_REG_INTERRUPT, val: &tmp); |
899 | if (ret) { |
900 | dev_err(&data->client->dev, "Failed to reset int pin.\n" ); |
901 | return ret; |
902 | } |
903 | |
904 | return 0; |
905 | } |
906 | |
907 | static bool rpr0521_is_volatile_reg(struct device *dev, unsigned int reg) |
908 | { |
909 | switch (reg) { |
910 | case RPR0521_REG_MODE_CTRL: |
911 | case RPR0521_REG_ALS_CTRL: |
912 | case RPR0521_REG_PXS_CTRL: |
913 | return false; |
914 | default: |
915 | return true; |
916 | } |
917 | } |
918 | |
919 | static const struct regmap_config rpr0521_regmap_config = { |
920 | .name = RPR0521_REGMAP_NAME, |
921 | |
922 | .reg_bits = 8, |
923 | .val_bits = 8, |
924 | |
925 | .max_register = RPR0521_REG_ID, |
926 | .cache_type = REGCACHE_RBTREE, |
927 | .volatile_reg = rpr0521_is_volatile_reg, |
928 | }; |
929 | |
930 | static int rpr0521_probe(struct i2c_client *client) |
931 | { |
932 | struct rpr0521_data *data; |
933 | struct iio_dev *indio_dev; |
934 | struct regmap *regmap; |
935 | int ret; |
936 | |
937 | indio_dev = devm_iio_device_alloc(parent: &client->dev, sizeof_priv: sizeof(*data)); |
938 | if (!indio_dev) |
939 | return -ENOMEM; |
940 | |
941 | regmap = devm_regmap_init_i2c(client, &rpr0521_regmap_config); |
942 | if (IS_ERR(ptr: regmap)) { |
943 | dev_err(&client->dev, "regmap_init failed!\n" ); |
944 | return PTR_ERR(ptr: regmap); |
945 | } |
946 | |
947 | data = iio_priv(indio_dev); |
948 | i2c_set_clientdata(client, data: indio_dev); |
949 | data->client = client; |
950 | data->regmap = regmap; |
951 | |
952 | mutex_init(&data->lock); |
953 | |
954 | indio_dev->info = &rpr0521_info; |
955 | indio_dev->name = RPR0521_DRV_NAME; |
956 | indio_dev->channels = rpr0521_channels; |
957 | indio_dev->num_channels = ARRAY_SIZE(rpr0521_channels); |
958 | indio_dev->modes = INDIO_DIRECT_MODE; |
959 | |
960 | ret = rpr0521_init(data); |
961 | if (ret < 0) { |
962 | dev_err(&client->dev, "rpr0521 chip init failed\n" ); |
963 | return ret; |
964 | } |
965 | |
966 | ret = pm_runtime_set_active(dev: &client->dev); |
967 | if (ret < 0) |
968 | goto err_poweroff; |
969 | |
970 | pm_runtime_enable(dev: &client->dev); |
971 | pm_runtime_set_autosuspend_delay(dev: &client->dev, RPR0521_SLEEP_DELAY_MS); |
972 | pm_runtime_use_autosuspend(dev: &client->dev); |
973 | |
974 | /* |
975 | * If sensor write/read is needed in _probe after _use_autosuspend, |
976 | * sensor needs to be _resumed first using rpr0521_set_power_state(). |
977 | */ |
978 | |
979 | /* IRQ to trigger setup */ |
980 | if (client->irq) { |
981 | /* Trigger0 producer setup */ |
982 | data->drdy_trigger0 = devm_iio_trigger_alloc( |
983 | indio_dev->dev.parent, |
984 | "%s-dev%d" , indio_dev->name, iio_device_id(indio_dev)); |
985 | if (!data->drdy_trigger0) { |
986 | ret = -ENOMEM; |
987 | goto err_pm_disable; |
988 | } |
989 | data->drdy_trigger0->ops = &rpr0521_trigger_ops; |
990 | indio_dev->available_scan_masks = rpr0521_available_scan_masks; |
991 | iio_trigger_set_drvdata(trig: data->drdy_trigger0, data: indio_dev); |
992 | |
993 | /* Ties irq to trigger producer handler. */ |
994 | ret = devm_request_threaded_irq(dev: &client->dev, irq: client->irq, |
995 | handler: rpr0521_drdy_irq_handler, thread_fn: rpr0521_drdy_irq_thread, |
996 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
997 | RPR0521_IRQ_NAME, dev_id: indio_dev); |
998 | if (ret < 0) { |
999 | dev_err(&client->dev, "request irq %d for trigger0 failed\n" , |
1000 | client->irq); |
1001 | goto err_pm_disable; |
1002 | } |
1003 | |
1004 | ret = devm_iio_trigger_register(dev: indio_dev->dev.parent, |
1005 | trig_info: data->drdy_trigger0); |
1006 | if (ret) { |
1007 | dev_err(&client->dev, "iio trigger register failed\n" ); |
1008 | goto err_pm_disable; |
1009 | } |
1010 | |
1011 | /* |
1012 | * Now whole pipe from physical interrupt (irq defined by |
1013 | * devicetree to device) to trigger0 output is set up. |
1014 | */ |
1015 | |
1016 | /* Trigger consumer setup */ |
1017 | ret = devm_iio_triggered_buffer_setup(indio_dev->dev.parent, |
1018 | indio_dev, |
1019 | rpr0521_trigger_consumer_store_time, |
1020 | rpr0521_trigger_consumer_handler, |
1021 | &rpr0521_buffer_setup_ops); |
1022 | if (ret < 0) { |
1023 | dev_err(&client->dev, "iio triggered buffer setup failed\n" ); |
1024 | goto err_pm_disable; |
1025 | } |
1026 | } |
1027 | |
1028 | ret = iio_device_register(indio_dev); |
1029 | if (ret) |
1030 | goto err_pm_disable; |
1031 | |
1032 | return 0; |
1033 | |
1034 | err_pm_disable: |
1035 | pm_runtime_disable(dev: &client->dev); |
1036 | pm_runtime_set_suspended(dev: &client->dev); |
1037 | err_poweroff: |
1038 | rpr0521_poweroff(data); |
1039 | |
1040 | return ret; |
1041 | } |
1042 | |
1043 | static void rpr0521_remove(struct i2c_client *client) |
1044 | { |
1045 | struct iio_dev *indio_dev = i2c_get_clientdata(client); |
1046 | |
1047 | iio_device_unregister(indio_dev); |
1048 | |
1049 | pm_runtime_disable(dev: &client->dev); |
1050 | pm_runtime_set_suspended(dev: &client->dev); |
1051 | |
1052 | rpr0521_poweroff(data: iio_priv(indio_dev)); |
1053 | } |
1054 | |
1055 | static int rpr0521_runtime_suspend(struct device *dev) |
1056 | { |
1057 | struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); |
1058 | struct rpr0521_data *data = iio_priv(indio_dev); |
1059 | int ret; |
1060 | |
1061 | mutex_lock(&data->lock); |
1062 | /* If measurements are enabled, enable them on resume */ |
1063 | if (!data->als_need_dis) |
1064 | data->als_ps_need_en = data->als_dev_en; |
1065 | if (!data->pxs_need_dis) |
1066 | data->pxs_ps_need_en = data->pxs_dev_en; |
1067 | |
1068 | /* disable channels and sets {als,pxs}_dev_en to false */ |
1069 | ret = rpr0521_poweroff(data); |
1070 | regcache_mark_dirty(map: data->regmap); |
1071 | mutex_unlock(lock: &data->lock); |
1072 | |
1073 | return ret; |
1074 | } |
1075 | |
1076 | static int rpr0521_runtime_resume(struct device *dev) |
1077 | { |
1078 | struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); |
1079 | struct rpr0521_data *data = iio_priv(indio_dev); |
1080 | int ret; |
1081 | |
1082 | regcache_sync(map: data->regmap); |
1083 | if (data->als_ps_need_en) { |
1084 | ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE); |
1085 | if (ret < 0) |
1086 | return ret; |
1087 | data->als_ps_need_en = false; |
1088 | } |
1089 | |
1090 | if (data->pxs_ps_need_en) { |
1091 | ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE); |
1092 | if (ret < 0) |
1093 | return ret; |
1094 | data->pxs_ps_need_en = false; |
1095 | } |
1096 | msleep(msecs: 100); //wait for first measurement result |
1097 | |
1098 | return 0; |
1099 | } |
1100 | |
1101 | static const struct dev_pm_ops rpr0521_pm_ops = { |
1102 | RUNTIME_PM_OPS(rpr0521_runtime_suspend, rpr0521_runtime_resume, NULL) |
1103 | }; |
1104 | |
1105 | static const struct acpi_device_id rpr0521_acpi_match[] = { |
1106 | {"RPR0521" , 0}, |
1107 | { } |
1108 | }; |
1109 | MODULE_DEVICE_TABLE(acpi, rpr0521_acpi_match); |
1110 | |
1111 | static const struct i2c_device_id rpr0521_id[] = { |
1112 | {"rpr0521" , 0}, |
1113 | { } |
1114 | }; |
1115 | |
1116 | MODULE_DEVICE_TABLE(i2c, rpr0521_id); |
1117 | |
1118 | static struct i2c_driver rpr0521_driver = { |
1119 | .driver = { |
1120 | .name = RPR0521_DRV_NAME, |
1121 | .pm = pm_ptr(&rpr0521_pm_ops), |
1122 | .acpi_match_table = ACPI_PTR(rpr0521_acpi_match), |
1123 | }, |
1124 | .probe = rpr0521_probe, |
1125 | .remove = rpr0521_remove, |
1126 | .id_table = rpr0521_id, |
1127 | }; |
1128 | |
1129 | module_i2c_driver(rpr0521_driver); |
1130 | |
1131 | MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com>" ); |
1132 | MODULE_DESCRIPTION("RPR0521 ROHM Ambient Light and Proximity Sensor driver" ); |
1133 | MODULE_LICENSE("GPL v2" ); |
1134 | |