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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_NAME "mma9551_int"
31#define MMA9551_GPIO_COUNT 4
32
33
34#define MMA9551_TILT_XZ_ANG_REG 0x00
35#define MMA9551_TILT_YZ_ANG_REG 0x01
36#define MMA9551_TILT_XY_ANG_REG 0x02
37#define MMA9551_TILT_ANGFLG BIT(7)
38#define MMA9551_TILT_QUAD_REG 0x03
39#define MMA9551_TILT_XY_QUAD_SHIFT 0
40#define MMA9551_TILT_YZ_QUAD_SHIFT 2
41#define MMA9551_TILT_XZ_QUAD_SHIFT 4
42#define MMA9551_TILT_CFG_REG 0x01
43#define MMA9551_TILT_ANG_THRESH_MASK GENMASK(3, 0)
44
45#define MMA9551_DEFAULT_SAMPLE_RATE 122
46
47
48enum mma9551_tilt_axis {
49 mma9551_x = 0,
50 mma9551_y,
51 mma9551_z,
52};
53
54struct mma9551_data {
55 struct i2c_client *client;
56 struct mutex mutex;
57 int event_enabled[3];
58 int irqs[MMA9551_GPIO_COUNT];
59};
60
61static int mma9551_read_incli_chan(struct i2c_client *client,
62 const struct iio_chan_spec *chan,
63 int *val)
64{
65 u8 quad_shift, angle, quadrant;
66 u16 reg_addr;
67 int ret;
68
69 switch (chan->channel2) {
70 case IIO_MOD_X:
71 reg_addr = MMA9551_TILT_YZ_ANG_REG;
72 quad_shift = MMA9551_TILT_YZ_QUAD_SHIFT;
73 break;
74 case IIO_MOD_Y:
75 reg_addr = MMA9551_TILT_XZ_ANG_REG;
76 quad_shift = MMA9551_TILT_XZ_QUAD_SHIFT;
77 break;
78 case IIO_MOD_Z:
79 reg_addr = MMA9551_TILT_XY_ANG_REG;
80 quad_shift = MMA9551_TILT_XY_QUAD_SHIFT;
81 break;
82 default:
83 return -EINVAL;
84 }
85
86 ret = mma9551_set_power_state(client, true);
87 if (ret < 0)
88 return ret;
89
90 ret = mma9551_read_status_byte(client, MMA9551_APPID_TILT,
91 reg_addr, &angle);
92 if (ret < 0)
93 goto out_poweroff;
94
95 ret = mma9551_read_status_byte(client, MMA9551_APPID_TILT,
96 MMA9551_TILT_QUAD_REG, &quadrant);
97 if (ret < 0)
98 goto out_poweroff;
99
100 angle &= ~MMA9551_TILT_ANGFLG;
101 quadrant = (quadrant >> quad_shift) & 0x03;
102
103 if (quadrant == 1 || quadrant == 3)
104 *val = 90 * (quadrant + 1) - angle;
105 else
106 *val = angle + 90 * quadrant;
107
108 ret = IIO_VAL_INT;
109
110out_poweroff:
111 mma9551_set_power_state(client, false);
112 return ret;
113}
114
115static int mma9551_read_raw(struct iio_dev *indio_dev,
116 struct iio_chan_spec const *chan,
117 int *val, int *val2, long mask)
118{
119 struct mma9551_data *data = iio_priv(indio_dev);
120 int ret;
121
122 switch (mask) {
123 case IIO_CHAN_INFO_PROCESSED:
124 switch (chan->type) {
125 case IIO_INCLI:
126 mutex_lock(&data->mutex);
127 ret = mma9551_read_incli_chan(data->client, chan, val);
128 mutex_unlock(&data->mutex);
129 return ret;
130 default:
131 return -EINVAL;
132 }
133 case IIO_CHAN_INFO_RAW:
134 switch (chan->type) {
135 case IIO_ACCEL:
136 mutex_lock(&data->mutex);
137 ret = mma9551_read_accel_chan(data->client,
138 chan, val, val2);
139 mutex_unlock(&data->mutex);
140 return ret;
141 default:
142 return -EINVAL;
143 }
144 case IIO_CHAN_INFO_SCALE:
145 switch (chan->type) {
146 case IIO_ACCEL:
147 return mma9551_read_accel_scale(val, val2);
148 default:
149 return -EINVAL;
150 }
151 default:
152 return -EINVAL;
153 }
154}
155
156static int mma9551_read_event_config(struct iio_dev *indio_dev,
157 const struct iio_chan_spec *chan,
158 enum iio_event_type type,
159 enum iio_event_direction dir)
160{
161 struct mma9551_data *data = iio_priv(indio_dev);
162
163 switch (chan->type) {
164 case IIO_INCLI:
165
166 return data->event_enabled[chan->channel2 - 1];
167 default:
168 return -EINVAL;
169 }
170}
171
172static int mma9551_config_incli_event(struct iio_dev *indio_dev,
173 enum iio_modifier axis,
174 int state)
175{
176 struct mma9551_data *data = iio_priv(indio_dev);
177 enum mma9551_tilt_axis mma_axis;
178 int ret;
179
180
181 mma_axis = axis - 1;
182
183 if (data->event_enabled[mma_axis] == state)
184 return 0;
185
186 if (state == 0) {
187 ret = mma9551_gpio_config(data->client,
188 (enum mma9551_gpio_pin)mma_axis,
189 MMA9551_APPID_NONE, 0, 0);
190 if (ret < 0)
191 return ret;
192
193 ret = mma9551_set_power_state(data->client, false);
194 if (ret < 0)
195 return ret;
196 } else {
197 int bitnum;
198
199
200 switch (axis) {
201 case IIO_MOD_X:
202 bitnum = 7 + 8 * MMA9551_TILT_YZ_ANG_REG;
203 break;
204 case IIO_MOD_Y:
205 bitnum = 7 + 8 * MMA9551_TILT_XZ_ANG_REG;
206 break;
207 case IIO_MOD_Z:
208 bitnum = 7 + 8 * MMA9551_TILT_XY_ANG_REG;
209 break;
210 default:
211 return -EINVAL;
212 }
213
214
215 ret = mma9551_set_power_state(data->client, true);
216 if (ret < 0)
217 return ret;
218
219 ret = mma9551_gpio_config(data->client,
220 (enum mma9551_gpio_pin)mma_axis,
221 MMA9551_APPID_TILT, bitnum, 0);
222 if (ret < 0) {
223 mma9551_set_power_state(data->client, false);
224 return ret;
225 }
226 }
227
228 data->event_enabled[mma_axis] = state;
229
230 return ret;
231}
232
233static int mma9551_write_event_config(struct iio_dev *indio_dev,
234 const struct iio_chan_spec *chan,
235 enum iio_event_type type,
236 enum iio_event_direction dir,
237 int state)
238{
239 struct mma9551_data *data = iio_priv(indio_dev);
240 int ret;
241
242 switch (chan->type) {
243 case IIO_INCLI:
244 mutex_lock(&data->mutex);
245 ret = mma9551_config_incli_event(indio_dev,
246 chan->channel2, state);
247 mutex_unlock(&data->mutex);
248 return ret;
249 default:
250 return -EINVAL;
251 }
252}
253
254static int mma9551_write_event_value(struct iio_dev *indio_dev,
255 const struct iio_chan_spec *chan,
256 enum iio_event_type type,
257 enum iio_event_direction dir,
258 enum iio_event_info info,
259 int val, int val2)
260{
261 struct mma9551_data *data = iio_priv(indio_dev);
262 int ret;
263
264 switch (chan->type) {
265 case IIO_INCLI:
266 if (val2 != 0 || val < 1 || val > 10)
267 return -EINVAL;
268 mutex_lock(&data->mutex);
269 ret = mma9551_update_config_bits(data->client,
270 MMA9551_APPID_TILT,
271 MMA9551_TILT_CFG_REG,
272 MMA9551_TILT_ANG_THRESH_MASK,
273 val);
274 mutex_unlock(&data->mutex);
275 return ret;
276 default:
277 return -EINVAL;
278 }
279}
280
281static int mma9551_read_event_value(struct iio_dev *indio_dev,
282 const struct iio_chan_spec *chan,
283 enum iio_event_type type,
284 enum iio_event_direction dir,
285 enum iio_event_info info,
286 int *val, int *val2)
287{
288 struct mma9551_data *data = iio_priv(indio_dev);
289 int ret;
290 u8 tmp;
291
292 switch (chan->type) {
293 case IIO_INCLI:
294 mutex_lock(&data->mutex);
295 ret = mma9551_read_config_byte(data->client,
296 MMA9551_APPID_TILT,
297 MMA9551_TILT_CFG_REG, &tmp);
298 mutex_unlock(&data->mutex);
299 if (ret < 0)
300 return ret;
301 *val = tmp & MMA9551_TILT_ANG_THRESH_MASK;
302 *val2 = 0;
303 return IIO_VAL_INT;
304 default:
305 return -EINVAL;
306 }
307}
308
309static const struct iio_event_spec mma9551_incli_event = {
310 .type = IIO_EV_TYPE_ROC,
311 .dir = IIO_EV_DIR_RISING,
312 .mask_separate = BIT(IIO_EV_INFO_ENABLE),
313 .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE),
314};
315
316#define MMA9551_INCLI_CHANNEL(axis) { \
317 .type = IIO_INCLI, \
318 .modified = 1, \
319 .channel2 = axis, \
320 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
321 .event_spec = &mma9551_incli_event, \
322 .num_event_specs = 1, \
323}
324
325static const struct iio_chan_spec mma9551_channels[] = {
326 MMA9551_ACCEL_CHANNEL(IIO_MOD_X),
327 MMA9551_ACCEL_CHANNEL(IIO_MOD_Y),
328 MMA9551_ACCEL_CHANNEL(IIO_MOD_Z),
329
330 MMA9551_INCLI_CHANNEL(IIO_MOD_X),
331 MMA9551_INCLI_CHANNEL(IIO_MOD_Y),
332 MMA9551_INCLI_CHANNEL(IIO_MOD_Z),
333};
334
335static const struct iio_info mma9551_info = {
336 .driver_module = THIS_MODULE,
337 .read_raw = mma9551_read_raw,
338 .read_event_config = mma9551_read_event_config,
339 .write_event_config = mma9551_write_event_config,
340 .read_event_value = mma9551_read_event_value,
341 .write_event_value = mma9551_write_event_value,
342};
343
344static irqreturn_t mma9551_event_handler(int irq, void *private)
345{
346 struct iio_dev *indio_dev = private;
347 struct mma9551_data *data = iio_priv(indio_dev);
348 int i, ret, mma_axis = -1;
349 u16 reg;
350 u8 val;
351
352 mutex_lock(&data->mutex);
353
354 for (i = 0; i < 3; i++)
355 if (irq == data->irqs[i]) {
356 mma_axis = i;
357 break;
358 }
359
360 if (mma_axis == -1) {
361
362 dev_warn(&data->client->dev,
363 "irq triggered on unused line %d\n", data->irqs[3]);
364 goto out;
365 }
366
367 switch (mma_axis) {
368 case mma9551_x:
369 reg = MMA9551_TILT_YZ_ANG_REG;
370 break;
371 case mma9551_y:
372 reg = MMA9551_TILT_XZ_ANG_REG;
373 break;
374 case mma9551_z:
375 reg = MMA9551_TILT_XY_ANG_REG;
376 break;
377 }
378
379
380
381
382
383 ret = mma9551_read_status_byte(data->client, MMA9551_APPID_TILT,
384 reg, &val);
385 if (ret < 0) {
386 dev_err(&data->client->dev,
387 "error %d reading tilt register in IRQ\n", ret);
388 goto out;
389 }
390
391 iio_push_event(indio_dev,
392 IIO_MOD_EVENT_CODE(IIO_INCLI, 0, (mma_axis + 1),
393 IIO_EV_TYPE_ROC, IIO_EV_DIR_RISING),
394 iio_get_time_ns(indio_dev));
395
396out:
397 mutex_unlock(&data->mutex);
398
399 return IRQ_HANDLED;
400}
401
402static int mma9551_init(struct mma9551_data *data)
403{
404 int ret;
405
406 ret = mma9551_read_version(data->client);
407 if (ret)
408 return ret;
409
410 return mma9551_set_device_state(data->client, true);
411}
412
413static int mma9551_gpio_probe(struct iio_dev *indio_dev)
414{
415 struct gpio_desc *gpio;
416 int i, ret;
417 struct mma9551_data *data = iio_priv(indio_dev);
418 struct device *dev = &data->client->dev;
419
420 for (i = 0; i < MMA9551_GPIO_COUNT; i++) {
421 gpio = devm_gpiod_get_index(dev, MMA9551_GPIO_NAME, i,
422 GPIOD_IN);
423 if (IS_ERR(gpio)) {
424 dev_err(dev, "acpi gpio get index failed\n");
425 return PTR_ERR(gpio);
426 }
427
428 ret = gpiod_to_irq(gpio);
429 if (ret < 0)
430 return ret;
431
432 data->irqs[i] = ret;
433 ret = devm_request_threaded_irq(dev, data->irqs[i],
434 NULL, mma9551_event_handler,
435 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
436 MMA9551_IRQ_NAME, indio_dev);
437 if (ret < 0) {
438 dev_err(dev, "request irq %d failed\n", data->irqs[i]);
439 return ret;
440 }
441
442 dev_dbg(dev, "gpio resource, no:%d irq:%d\n",
443 desc_to_gpio(gpio), data->irqs[i]);
444 }
445
446 return 0;
447}
448
449static const char *mma9551_match_acpi_device(struct device *dev)
450{
451 const struct acpi_device_id *id;
452
453 id = acpi_match_device(dev->driver->acpi_match_table, dev);
454 if (!id)
455 return NULL;
456
457 return dev_name(dev);
458}
459
460static int mma9551_probe(struct i2c_client *client,
461 const struct i2c_device_id *id)
462{
463 struct mma9551_data *data;
464 struct iio_dev *indio_dev;
465 const char *name = NULL;
466 int ret;
467
468 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
469 if (!indio_dev)
470 return -ENOMEM;
471
472 data = iio_priv(indio_dev);
473 i2c_set_clientdata(client, indio_dev);
474 data->client = client;
475
476 if (id)
477 name = id->name;
478 else if (ACPI_HANDLE(&client->dev))
479 name = mma9551_match_acpi_device(&client->dev);
480
481 ret = mma9551_init(data);
482 if (ret < 0)
483 return ret;
484
485 mutex_init(&data->mutex);
486
487 indio_dev->dev.parent = &client->dev;
488 indio_dev->channels = mma9551_channels;
489 indio_dev->num_channels = ARRAY_SIZE(mma9551_channels);
490 indio_dev->name = name;
491 indio_dev->modes = INDIO_DIRECT_MODE;
492 indio_dev->info = &mma9551_info;
493
494 ret = mma9551_gpio_probe(indio_dev);
495 if (ret < 0)
496 goto out_poweroff;
497
498 ret = pm_runtime_set_active(&client->dev);
499 if (ret < 0)
500 goto out_poweroff;
501
502 pm_runtime_enable(&client->dev);
503 pm_runtime_set_autosuspend_delay(&client->dev,
504 MMA9551_AUTO_SUSPEND_DELAY_MS);
505 pm_runtime_use_autosuspend(&client->dev);
506
507 ret = iio_device_register(indio_dev);
508 if (ret < 0) {
509 dev_err(&client->dev, "unable to register iio device\n");
510 goto out_poweroff;
511 }
512
513 return 0;
514
515out_poweroff:
516 mma9551_set_device_state(client, false);
517
518 return ret;
519}
520
521static int mma9551_remove(struct i2c_client *client)
522{
523 struct iio_dev *indio_dev = i2c_get_clientdata(client);
524 struct mma9551_data *data = iio_priv(indio_dev);
525
526 iio_device_unregister(indio_dev);
527
528 pm_runtime_disable(&client->dev);
529 pm_runtime_set_suspended(&client->dev);
530 pm_runtime_put_noidle(&client->dev);
531
532 mutex_lock(&data->mutex);
533 mma9551_set_device_state(data->client, false);
534 mutex_unlock(&data->mutex);
535
536 return 0;
537}
538
539#ifdef CONFIG_PM
540static int mma9551_runtime_suspend(struct device *dev)
541{
542 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
543 struct mma9551_data *data = iio_priv(indio_dev);
544 int ret;
545
546 mutex_lock(&data->mutex);
547 ret = mma9551_set_device_state(data->client, false);
548 mutex_unlock(&data->mutex);
549 if (ret < 0) {
550 dev_err(&data->client->dev, "powering off device failed\n");
551 return -EAGAIN;
552 }
553
554 return 0;
555}
556
557static int mma9551_runtime_resume(struct device *dev)
558{
559 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
560 struct mma9551_data *data = iio_priv(indio_dev);
561 int ret;
562
563 ret = mma9551_set_device_state(data->client, true);
564 if (ret < 0)
565 return ret;
566
567 mma9551_sleep(MMA9551_DEFAULT_SAMPLE_RATE);
568
569 return 0;
570}
571#endif
572
573#ifdef CONFIG_PM_SLEEP
574static int mma9551_suspend(struct device *dev)
575{
576 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
577 struct mma9551_data *data = iio_priv(indio_dev);
578 int ret;
579
580 mutex_lock(&data->mutex);
581 ret = mma9551_set_device_state(data->client, false);
582 mutex_unlock(&data->mutex);
583
584 return ret;
585}
586
587static int mma9551_resume(struct device *dev)
588{
589 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
590 struct mma9551_data *data = iio_priv(indio_dev);
591 int ret;
592
593 mutex_lock(&data->mutex);
594 ret = mma9551_set_device_state(data->client, true);
595 mutex_unlock(&data->mutex);
596
597 return ret;
598}
599#endif
600
601static const struct dev_pm_ops mma9551_pm_ops = {
602 SET_SYSTEM_SLEEP_PM_OPS(mma9551_suspend, mma9551_resume)
603 SET_RUNTIME_PM_OPS(mma9551_runtime_suspend,
604 mma9551_runtime_resume, NULL)
605};
606
607static const struct acpi_device_id mma9551_acpi_match[] = {
608 {"MMA9551", 0},
609 {},
610};
611
612MODULE_DEVICE_TABLE(acpi, mma9551_acpi_match);
613
614static const struct i2c_device_id mma9551_id[] = {
615 {"mma9551", 0},
616 {}
617};
618
619MODULE_DEVICE_TABLE(i2c, mma9551_id);
620
621static struct i2c_driver mma9551_driver = {
622 .driver = {
623 .name = MMA9551_DRV_NAME,
624 .acpi_match_table = ACPI_PTR(mma9551_acpi_match),
625 .pm = &mma9551_pm_ops,
626 },
627 .probe = mma9551_probe,
628 .remove = mma9551_remove,
629 .id_table = mma9551_id,
630};
631
632module_i2c_driver(mma9551_driver);
633
634MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>");
635MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>");
636MODULE_LICENSE("GPL v2");
637MODULE_DESCRIPTION("MMA9551L motion-sensing platform driver");
638
