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Linux 4.16.11
[linux/fpc-iii.git] / drivers / iio / accel / mma9551.c
blobda7c21504f3874db0770724b47934341490c9cd1
1 /*
2 * Freescale MMA9551L Intelligent Motion-Sensing Platform driver
3 * Copyright (c) 2014, Intel Corporation.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 */
14
15 #include <linux/module.h>
16 #include <linux/i2c.h>
17 #include <linux/interrupt.h>
18 #include <linux/slab.h>
19 #include <linux/acpi.h>
20 #include <linux/delay.h>
21 #include <linux/gpio/consumer.h>
22 #include <linux/iio/iio.h>
23 #include <linux/iio/sysfs.h>
24 #include <linux/iio/events.h>
25 #include <linux/pm_runtime.h>
26 #include "mma9551_core.h"
27
28 #define MMA9551_DRV_NAME "mma9551"
29 #define MMA9551_IRQ_NAME "mma9551_event"
30 #define MMA9551_GPIO_COUNT 4
31
32 /* Tilt application (inclination in IIO terms). */
33 #define MMA9551_TILT_XZ_ANG_REG 0x00
34 #define MMA9551_TILT_YZ_ANG_REG 0x01
35 #define MMA9551_TILT_XY_ANG_REG 0x02
36 #define MMA9551_TILT_ANGFLG BIT(7)
37 #define MMA9551_TILT_QUAD_REG 0x03
38 #define MMA9551_TILT_XY_QUAD_SHIFT 0
39 #define MMA9551_TILT_YZ_QUAD_SHIFT 2
40 #define MMA9551_TILT_XZ_QUAD_SHIFT 4
41 #define MMA9551_TILT_CFG_REG 0x01
42 #define MMA9551_TILT_ANG_THRESH_MASK GENMASK(3, 0)
43
44 #define MMA9551_DEFAULT_SAMPLE_RATE 122 /* Hz */
45
46 /* Tilt events are mapped to the first three GPIO pins. */
47 enum mma9551_tilt_axis {
48 mma9551_x = 0,
49 mma9551_y,
50 mma9551_z,
51 };
52
53 struct mma9551_data {
54 struct i2c_client *client;
55 struct mutex mutex;
56 int event_enabled[3];
57 int irqs[MMA9551_GPIO_COUNT];
58 };
59
60 static int mma9551_read_incli_chan(struct i2c_client *client,
61 const struct iio_chan_spec *chan,
62 int *val)
63 {
64 u8 quad_shift, angle, quadrant;
65 u16 reg_addr;
66 int ret;
67
68 switch (chan->channel2) {
69 case IIO_MOD_X:
70 reg_addr = MMA9551_TILT_YZ_ANG_REG;
71 quad_shift = MMA9551_TILT_YZ_QUAD_SHIFT;
72 break;
73 case IIO_MOD_Y:
74 reg_addr = MMA9551_TILT_XZ_ANG_REG;
75 quad_shift = MMA9551_TILT_XZ_QUAD_SHIFT;
76 break;
77 case IIO_MOD_Z:
78 reg_addr = MMA9551_TILT_XY_ANG_REG;
79 quad_shift = MMA9551_TILT_XY_QUAD_SHIFT;
80 break;
81 default:
82 return -EINVAL;
83 }
84
85 ret = mma9551_set_power_state(client, true);
86 if (ret < 0)
87 return ret;
88
89 ret = mma9551_read_status_byte(client, MMA9551_APPID_TILT,
90 reg_addr, &angle);
91 if (ret < 0)
92 goto out_poweroff;
93
94 ret = mma9551_read_status_byte(client, MMA9551_APPID_TILT,
95 MMA9551_TILT_QUAD_REG, &quadrant);
96 if (ret < 0)
97 goto out_poweroff;
98
99 angle &= ~MMA9551_TILT_ANGFLG;
100 quadrant = (quadrant >> quad_shift) & 0x03;
101
102 if (quadrant == 1 || quadrant == 3)
103 *val = 90 * (quadrant + 1) - angle;
104 else
105 *val = angle + 90 * quadrant;
106
107 ret = IIO_VAL_INT;
108
109 out_poweroff:
110 mma9551_set_power_state(client, false);
111 return ret;
112 }
113
114 static int mma9551_read_raw(struct iio_dev *indio_dev,
115 struct iio_chan_spec const *chan,
116 int *val, int *val2, long mask)
117 {
118 struct mma9551_data *data = iio_priv(indio_dev);
119 int ret;
120
121 switch (mask) {
122 case IIO_CHAN_INFO_PROCESSED:
123 switch (chan->type) {
124 case IIO_INCLI:
125 mutex_lock(&data->mutex);
126 ret = mma9551_read_incli_chan(data->client, chan, val);
127 mutex_unlock(&data->mutex);
128 return ret;
129 default:
130 return -EINVAL;
131 }
132 case IIO_CHAN_INFO_RAW:
133 switch (chan->type) {
134 case IIO_ACCEL:
135 mutex_lock(&data->mutex);
136 ret = mma9551_read_accel_chan(data->client,
137 chan, val, val2);
138 mutex_unlock(&data->mutex);
139 return ret;
140 default:
141 return -EINVAL;
142 }
143 case IIO_CHAN_INFO_SCALE:
144 switch (chan->type) {
145 case IIO_ACCEL:
146 return mma9551_read_accel_scale(val, val2);
147 default:
148 return -EINVAL;
149 }
150 default:
151 return -EINVAL;
152 }
153 }
154
155 static int mma9551_read_event_config(struct iio_dev *indio_dev,
156 const struct iio_chan_spec *chan,
157 enum iio_event_type type,
158 enum iio_event_direction dir)
159 {
160 struct mma9551_data *data = iio_priv(indio_dev);
161
162 switch (chan->type) {
163 case IIO_INCLI:
164 /* IIO counts axes from 1, because IIO_NO_MOD is 0. */
165 return data->event_enabled[chan->channel2 - 1];
166 default:
167 return -EINVAL;
168 }
169 }
170
171 static int mma9551_config_incli_event(struct iio_dev *indio_dev,
172 enum iio_modifier axis,
173 int state)
174 {
175 struct mma9551_data *data = iio_priv(indio_dev);
176 enum mma9551_tilt_axis mma_axis;
177 int ret;
178
179 /* IIO counts axes from 1, because IIO_NO_MOD is 0. */
180 mma_axis = axis - 1;
181
182 if (data->event_enabled[mma_axis] == state)
183 return 0;
184
185 if (state == 0) {
186 ret = mma9551_gpio_config(data->client,
187 (enum mma9551_gpio_pin)mma_axis,
188 MMA9551_APPID_NONE, 0, 0);
189 if (ret < 0)
190 return ret;
191
192 ret = mma9551_set_power_state(data->client, false);
193 if (ret < 0)
194 return ret;
195 } else {
196 int bitnum;
197
198 /* Bit 7 of each angle register holds the angle flag. */
199 switch (axis) {
200 case IIO_MOD_X:
201 bitnum = 7 + 8 * MMA9551_TILT_YZ_ANG_REG;
202 break;
203 case IIO_MOD_Y:
204 bitnum = 7 + 8 * MMA9551_TILT_XZ_ANG_REG;
205 break;
206 case IIO_MOD_Z:
207 bitnum = 7 + 8 * MMA9551_TILT_XY_ANG_REG;
208 break;
209 default:
210 return -EINVAL;
211 }
212
213
214 ret = mma9551_set_power_state(data->client, true);
215 if (ret < 0)
216 return ret;
217
218 ret = mma9551_gpio_config(data->client,
219 (enum mma9551_gpio_pin)mma_axis,
220 MMA9551_APPID_TILT, bitnum, 0);
221 if (ret < 0) {
222 mma9551_set_power_state(data->client, false);
223 return ret;
224 }
225 }
226
227 data->event_enabled[mma_axis] = state;
228
229 return ret;
230 }
231
232 static int mma9551_write_event_config(struct iio_dev *indio_dev,
233 const struct iio_chan_spec *chan,
234 enum iio_event_type type,
235 enum iio_event_direction dir,
236 int state)
237 {
238 struct mma9551_data *data = iio_priv(indio_dev);
239 int ret;
240
241 switch (chan->type) {
242 case IIO_INCLI:
243 mutex_lock(&data->mutex);
244 ret = mma9551_config_incli_event(indio_dev,
245 chan->channel2, state);
246 mutex_unlock(&data->mutex);
247 return ret;
248 default:
249 return -EINVAL;
250 }
251 }
252
253 static int mma9551_write_event_value(struct iio_dev *indio_dev,
254 const struct iio_chan_spec *chan,
255 enum iio_event_type type,
256 enum iio_event_direction dir,
257 enum iio_event_info info,
258 int val, int val2)
259 {
260 struct mma9551_data *data = iio_priv(indio_dev);
261 int ret;
262
263 switch (chan->type) {
264 case IIO_INCLI:
265 if (val2 != 0 || val < 1 || val > 10)
266 return -EINVAL;
267 mutex_lock(&data->mutex);
268 ret = mma9551_update_config_bits(data->client,
269 MMA9551_APPID_TILT,
270 MMA9551_TILT_CFG_REG,
271 MMA9551_TILT_ANG_THRESH_MASK,
272 val);
273 mutex_unlock(&data->mutex);
274 return ret;
275 default:
276 return -EINVAL;
277 }
278 }
279
280 static int mma9551_read_event_value(struct iio_dev *indio_dev,
281 const struct iio_chan_spec *chan,
282 enum iio_event_type type,
283 enum iio_event_direction dir,
284 enum iio_event_info info,
285 int *val, int *val2)
286 {
287 struct mma9551_data *data = iio_priv(indio_dev);
288 int ret;
289 u8 tmp;
290
291 switch (chan->type) {
292 case IIO_INCLI:
293 mutex_lock(&data->mutex);
294 ret = mma9551_read_config_byte(data->client,
295 MMA9551_APPID_TILT,
296 MMA9551_TILT_CFG_REG, &tmp);
297 mutex_unlock(&data->mutex);
298 if (ret < 0)
299 return ret;
300 *val = tmp & MMA9551_TILT_ANG_THRESH_MASK;
301 *val2 = 0;
302 return IIO_VAL_INT;
303 default:
304 return -EINVAL;
305 }
306 }
307
308 static const struct iio_event_spec mma9551_incli_event = {
309 .type = IIO_EV_TYPE_ROC,
310 .dir = IIO_EV_DIR_RISING,
311 .mask_separate = BIT(IIO_EV_INFO_ENABLE),
312 .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE),
313 };
314
315 #define MMA9551_INCLI_CHANNEL(axis) { \
316 .type = IIO_INCLI, \
317 .modified = 1, \
318 .channel2 = axis, \
319 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
320 .event_spec = &mma9551_incli_event, \
321 .num_event_specs = 1, \
322 }
323
324 static const struct iio_chan_spec mma9551_channels[] = {
325 MMA9551_ACCEL_CHANNEL(IIO_MOD_X),
326 MMA9551_ACCEL_CHANNEL(IIO_MOD_Y),
327 MMA9551_ACCEL_CHANNEL(IIO_MOD_Z),
328
329 MMA9551_INCLI_CHANNEL(IIO_MOD_X),
330 MMA9551_INCLI_CHANNEL(IIO_MOD_Y),
331 MMA9551_INCLI_CHANNEL(IIO_MOD_Z),
332 };
333
334 static const struct iio_info mma9551_info = {
335 .read_raw = mma9551_read_raw,
336 .read_event_config = mma9551_read_event_config,
337 .write_event_config = mma9551_write_event_config,
338 .read_event_value = mma9551_read_event_value,
339 .write_event_value = mma9551_write_event_value,
340 };
341
342 static irqreturn_t mma9551_event_handler(int irq, void *private)
343 {
344 struct iio_dev *indio_dev = private;
345 struct mma9551_data *data = iio_priv(indio_dev);
346 int i, ret, mma_axis = -1;
347 u16 reg;
348 u8 val;
349
350 mutex_lock(&data->mutex);
351
352 for (i = 0; i < 3; i++)
353 if (irq == data->irqs[i]) {
354 mma_axis = i;
355 break;
356 }
357
358 if (mma_axis == -1) {
359 /* IRQ was triggered on 4th line, which we don't use. */
360 dev_warn(&data->client->dev,
361 "irq triggered on unused line %d\n", data->irqs[3]);
362 goto out;
363 }
364
365 switch (mma_axis) {
366 case mma9551_x:
367 reg = MMA9551_TILT_YZ_ANG_REG;
368 break;
369 case mma9551_y:
370 reg = MMA9551_TILT_XZ_ANG_REG;
371 break;
372 case mma9551_z:
373 reg = MMA9551_TILT_XY_ANG_REG;
374 break;
375 }
376
377 /*
378 * Read the angle even though we don't use it, otherwise we
379 * won't get any further interrupts.
380 */
381 ret = mma9551_read_status_byte(data->client, MMA9551_APPID_TILT,
382 reg, &val);
383 if (ret < 0) {
384 dev_err(&data->client->dev,
385 "error %d reading tilt register in IRQ\n", ret);
386 goto out;
387 }
388
389 iio_push_event(indio_dev,
390 IIO_MOD_EVENT_CODE(IIO_INCLI, 0, (mma_axis + 1),
391 IIO_EV_TYPE_ROC, IIO_EV_DIR_RISING),
392 iio_get_time_ns(indio_dev));
393
394 out:
395 mutex_unlock(&data->mutex);
396
397 return IRQ_HANDLED;
398 }
399
400 static int mma9551_init(struct mma9551_data *data)
401 {
402 int ret;
403
404 ret = mma9551_read_version(data->client);
405 if (ret)
406 return ret;
407
408 return mma9551_set_device_state(data->client, true);
409 }
410
411 static int mma9551_gpio_probe(struct iio_dev *indio_dev)
412 {
413 struct gpio_desc *gpio;
414 int i, ret;
415 struct mma9551_data *data = iio_priv(indio_dev);
416 struct device *dev = &data->client->dev;
417
418 for (i = 0; i < MMA9551_GPIO_COUNT; i++) {
419 gpio = devm_gpiod_get_index(dev, NULL, i, GPIOD_IN);
420 if (IS_ERR(gpio)) {
421 dev_err(dev, "acpi gpio get index failed\n");
422 return PTR_ERR(gpio);
423 }
424
425 ret = gpiod_to_irq(gpio);
426 if (ret < 0)
427 return ret;
428
429 data->irqs[i] = ret;
430 ret = devm_request_threaded_irq(dev, data->irqs[i],
431 NULL, mma9551_event_handler,
432 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
433 MMA9551_IRQ_NAME, indio_dev);
434 if (ret < 0) {
435 dev_err(dev, "request irq %d failed\n", data->irqs[i]);
436 return ret;
437 }
438
439 dev_dbg(dev, "gpio resource, no:%d irq:%d\n",
440 desc_to_gpio(gpio), data->irqs[i]);
441 }
442
443 return 0;
444 }
445
446 static const char *mma9551_match_acpi_device(struct device *dev)
447 {
448 const struct acpi_device_id *id;
449
450 id = acpi_match_device(dev->driver->acpi_match_table, dev);
451 if (!id)
452 return NULL;
453
454 return dev_name(dev);
455 }
456
457 static int mma9551_probe(struct i2c_client *client,
458 const struct i2c_device_id *id)
459 {
460 struct mma9551_data *data;
461 struct iio_dev *indio_dev;
462 const char *name = NULL;
463 int ret;
464
465 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
466 if (!indio_dev)
467 return -ENOMEM;
468
469 data = iio_priv(indio_dev);
470 i2c_set_clientdata(client, indio_dev);
471 data->client = client;
472
473 if (id)
474 name = id->name;
475 else if (ACPI_HANDLE(&client->dev))
476 name = mma9551_match_acpi_device(&client->dev);
477
478 ret = mma9551_init(data);
479 if (ret < 0)
480 return ret;
481
482 mutex_init(&data->mutex);
483
484 indio_dev->dev.parent = &client->dev;
485 indio_dev->channels = mma9551_channels;
486 indio_dev->num_channels = ARRAY_SIZE(mma9551_channels);
487 indio_dev->name = name;
488 indio_dev->modes = INDIO_DIRECT_MODE;
489 indio_dev->info = &mma9551_info;
490
491 ret = mma9551_gpio_probe(indio_dev);
492 if (ret < 0)
493 goto out_poweroff;
494
495 ret = pm_runtime_set_active(&client->dev);
496 if (ret < 0)
497 goto out_poweroff;
498
499 pm_runtime_enable(&client->dev);
500 pm_runtime_set_autosuspend_delay(&client->dev,
501 MMA9551_AUTO_SUSPEND_DELAY_MS);
502 pm_runtime_use_autosuspend(&client->dev);
503
504 ret = iio_device_register(indio_dev);
505 if (ret < 0) {
506 dev_err(&client->dev, "unable to register iio device\n");
507 goto out_poweroff;
508 }
509
510 return 0;
511
512 out_poweroff:
513 mma9551_set_device_state(client, false);
514
515 return ret;
516 }
517
518 static int mma9551_remove(struct i2c_client *client)
519 {
520 struct iio_dev *indio_dev = i2c_get_clientdata(client);
521 struct mma9551_data *data = iio_priv(indio_dev);
522
523 iio_device_unregister(indio_dev);
524
525 pm_runtime_disable(&client->dev);
526 pm_runtime_set_suspended(&client->dev);
527 pm_runtime_put_noidle(&client->dev);
528
529 mutex_lock(&data->mutex);
530 mma9551_set_device_state(data->client, false);
531 mutex_unlock(&data->mutex);
532
533 return 0;
534 }
535
536 #ifdef CONFIG_PM
537 static int mma9551_runtime_suspend(struct device *dev)
538 {
539 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
540 struct mma9551_data *data = iio_priv(indio_dev);
541 int ret;
542
543 mutex_lock(&data->mutex);
544 ret = mma9551_set_device_state(data->client, false);
545 mutex_unlock(&data->mutex);
546 if (ret < 0) {
547 dev_err(&data->client->dev, "powering off device failed\n");
548 return -EAGAIN;
549 }
550
551 return 0;
552 }
553
554 static int mma9551_runtime_resume(struct device *dev)
555 {
556 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
557 struct mma9551_data *data = iio_priv(indio_dev);
558 int ret;
559
560 ret = mma9551_set_device_state(data->client, true);
561 if (ret < 0)
562 return ret;
563
564 mma9551_sleep(MMA9551_DEFAULT_SAMPLE_RATE);
565
566 return 0;
567 }
568 #endif
569
570 #ifdef CONFIG_PM_SLEEP
571 static int mma9551_suspend(struct device *dev)
572 {
573 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
574 struct mma9551_data *data = iio_priv(indio_dev);
575 int ret;
576
577 mutex_lock(&data->mutex);
578 ret = mma9551_set_device_state(data->client, false);
579 mutex_unlock(&data->mutex);
580
581 return ret;
582 }
583
584 static int mma9551_resume(struct device *dev)
585 {
586 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
587 struct mma9551_data *data = iio_priv(indio_dev);
588 int ret;
589
590 mutex_lock(&data->mutex);
591 ret = mma9551_set_device_state(data->client, true);
592 mutex_unlock(&data->mutex);
593
594 return ret;
595 }
596 #endif
597
598 static const struct dev_pm_ops mma9551_pm_ops = {
599 SET_SYSTEM_SLEEP_PM_OPS(mma9551_suspend, mma9551_resume)
600 SET_RUNTIME_PM_OPS(mma9551_runtime_suspend,
601 mma9551_runtime_resume, NULL)
602 };
603
604 static const struct acpi_device_id mma9551_acpi_match[] = {
605 {"MMA9551", 0},
606 {},
607 };
608
609 MODULE_DEVICE_TABLE(acpi, mma9551_acpi_match);
610
611 static const struct i2c_device_id mma9551_id[] = {
612 {"mma9551", 0},
613 {}
614 };
615
616 MODULE_DEVICE_TABLE(i2c, mma9551_id);
617
618 static struct i2c_driver mma9551_driver = {
619 .driver = {
620 .name = MMA9551_DRV_NAME,
621 .acpi_match_table = ACPI_PTR(mma9551_acpi_match),
622 .pm = &mma9551_pm_ops,
623 },
624 .probe = mma9551_probe,
625 .remove = mma9551_remove,
626 .id_table = mma9551_id,
627 };
628
629 module_i2c_driver(mma9551_driver);
630
631 MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>");
632 MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>");
633 MODULE_LICENSE("GPL v2");
634 MODULE_DESCRIPTION("MMA9551L motion-sensing platform driver");
Linux with added FPC-III support