2 * Freescale MMA9551L Intelligent Motion-Sensing Platform driver
3 * Copyright (c) 2014, Intel Corporation.
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.
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
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"
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
33 /* Tilt application (inclination in IIO terms). */
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)
45 #define MMA9551_DEFAULT_SAMPLE_RATE 122 /* Hz */
47 /* Tilt events are mapped to the first three GPIO pins. */
48 enum mma9551_tilt_axis {
55 struct i2c_client *client;
58 int irqs[MMA9551_GPIO_COUNT];
61 static int mma9551_read_incli_chan(struct i2c_client *client,
62 const struct iio_chan_spec *chan,
65 u8 quad_shift, angle, quadrant;
69 switch (chan->channel2) {
71 reg_addr = MMA9551_TILT_YZ_ANG_REG;
72 quad_shift = MMA9551_TILT_YZ_QUAD_SHIFT;
75 reg_addr = MMA9551_TILT_XZ_ANG_REG;
76 quad_shift = MMA9551_TILT_XZ_QUAD_SHIFT;
79 reg_addr = MMA9551_TILT_XY_ANG_REG;
80 quad_shift = MMA9551_TILT_XY_QUAD_SHIFT;
86 ret = mma9551_set_power_state(client, true);
90 ret = mma9551_read_status_byte(client, MMA9551_APPID_TILT,
95 ret = mma9551_read_status_byte(client, MMA9551_APPID_TILT,
96 MMA9551_TILT_QUAD_REG, &quadrant);
100 angle &= ~MMA9551_TILT_ANGFLG;
101 quadrant = (quadrant >> quad_shift) & 0x03;
103 if (quadrant == 1 || quadrant == 3)
104 *val = 90 * (quadrant + 1) - angle;
106 *val = angle + 90 * quadrant;
111 mma9551_set_power_state(client, false);
115 static int mma9551_read_raw(struct iio_dev *indio_dev,
116 struct iio_chan_spec const *chan,
117 int *val, int *val2, long mask)
119 struct mma9551_data *data = iio_priv(indio_dev);
123 case IIO_CHAN_INFO_PROCESSED:
124 switch (chan->type) {
126 mutex_lock(&data->mutex);
127 ret = mma9551_read_incli_chan(data->client, chan, val);
128 mutex_unlock(&data->mutex);
133 case IIO_CHAN_INFO_RAW:
134 switch (chan->type) {
136 mutex_lock(&data->mutex);
137 ret = mma9551_read_accel_chan(data->client,
139 mutex_unlock(&data->mutex);
144 case IIO_CHAN_INFO_SCALE:
145 switch (chan->type) {
147 return mma9551_read_accel_scale(val, val2);
156 static 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)
161 struct mma9551_data *data = iio_priv(indio_dev);
163 switch (chan->type) {
165 /* IIO counts axes from 1, because IIO_NO_MOD is 0. */
166 return data->event_enabled[chan->channel2 - 1];
172 static int mma9551_config_incli_event(struct iio_dev *indio_dev,
173 enum iio_modifier axis,
176 struct mma9551_data *data = iio_priv(indio_dev);
177 enum mma9551_tilt_axis mma_axis;
180 /* IIO counts axes from 1, because IIO_NO_MOD is 0. */
183 if (data->event_enabled[mma_axis] == state)
187 ret = mma9551_gpio_config(data->client,
188 (enum mma9551_gpio_pin)mma_axis,
189 MMA9551_APPID_NONE, 0, 0);
193 ret = mma9551_set_power_state(data->client, false);
199 /* Bit 7 of each angle register holds the angle flag. */
202 bitnum = 7 + 8 * MMA9551_TILT_YZ_ANG_REG;
205 bitnum = 7 + 8 * MMA9551_TILT_XZ_ANG_REG;
208 bitnum = 7 + 8 * MMA9551_TILT_XY_ANG_REG;
215 ret = mma9551_set_power_state(data->client, true);
219 ret = mma9551_gpio_config(data->client,
220 (enum mma9551_gpio_pin)mma_axis,
221 MMA9551_APPID_TILT, bitnum, 0);
223 mma9551_set_power_state(data->client, false);
228 data->event_enabled[mma_axis] = state;
233 static 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,
239 struct mma9551_data *data = iio_priv(indio_dev);
242 switch (chan->type) {
244 mutex_lock(&data->mutex);
245 ret = mma9551_config_incli_event(indio_dev,
246 chan->channel2, state);
247 mutex_unlock(&data->mutex);
254 static 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,
261 struct mma9551_data *data = iio_priv(indio_dev);
264 switch (chan->type) {
266 if (val2 != 0 || val < 1 || val > 10)
268 mutex_lock(&data->mutex);
269 ret = mma9551_update_config_bits(data->client,
271 MMA9551_TILT_CFG_REG,
272 MMA9551_TILT_ANG_THRESH_MASK,
274 mutex_unlock(&data->mutex);
281 static 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,
288 struct mma9551_data *data = iio_priv(indio_dev);
292 switch (chan->type) {
294 mutex_lock(&data->mutex);
295 ret = mma9551_read_config_byte(data->client,
297 MMA9551_TILT_CFG_REG, &tmp);
298 mutex_unlock(&data->mutex);
301 *val = tmp & MMA9551_TILT_ANG_THRESH_MASK;
309 static 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),
316 #define MMA9551_INCLI_CHANNEL(axis) { \
320 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
321 .event_spec = &mma9551_incli_event, \
322 .num_event_specs = 1, \
325 static 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),
330 MMA9551_INCLI_CHANNEL(IIO_MOD_X),
331 MMA9551_INCLI_CHANNEL(IIO_MOD_Y),
332 MMA9551_INCLI_CHANNEL(IIO_MOD_Z),
335 static 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,
344 static irqreturn_t mma9551_event_handler(int irq, void *private)
346 struct iio_dev *indio_dev = private;
347 struct mma9551_data *data = iio_priv(indio_dev);
348 int i, ret, mma_axis = -1;
352 mutex_lock(&data->mutex);
354 for (i = 0; i < 3; i++)
355 if (irq == data->irqs[i]) {
360 if (mma_axis == -1) {
361 /* IRQ was triggered on 4th line, which we don't use. */
362 dev_warn(&data->client->dev,
363 "irq triggered on unused line %d\n", data->irqs[3]);
369 reg = MMA9551_TILT_YZ_ANG_REG;
372 reg = MMA9551_TILT_XZ_ANG_REG;
375 reg = MMA9551_TILT_XY_ANG_REG;
380 * Read the angle even though we don't use it, otherwise we
381 * won't get any further interrupts.
383 ret = mma9551_read_status_byte(data->client, MMA9551_APPID_TILT,
386 dev_err(&data->client->dev,
387 "error %d reading tilt register in IRQ\n", ret);
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));
397 mutex_unlock(&data->mutex);
402 static int mma9551_init(struct mma9551_data *data)
406 ret = mma9551_read_version(data->client);
410 return mma9551_set_device_state(data->client, true);
413 static int mma9551_gpio_probe(struct iio_dev *indio_dev)
415 struct gpio_desc *gpio;
417 struct mma9551_data *data = iio_priv(indio_dev);
418 struct device *dev = &data->client->dev;
420 for (i = 0; i < MMA9551_GPIO_COUNT; i++) {
421 gpio = devm_gpiod_get_index(dev, MMA9551_GPIO_NAME, i,
424 dev_err(dev, "acpi gpio get index failed\n");
425 return PTR_ERR(gpio);
428 ret = gpiod_to_irq(gpio);
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);
438 dev_err(dev, "request irq %d failed\n", data->irqs[i]);
442 dev_dbg(dev, "gpio resource, no:%d irq:%d\n",
443 desc_to_gpio(gpio), data->irqs[i]);
449 static const char *mma9551_match_acpi_device(struct device *dev)
451 const struct acpi_device_id *id;
453 id = acpi_match_device(dev->driver->acpi_match_table, dev);
457 return dev_name(dev);
460 static int mma9551_probe(struct i2c_client *client,
461 const struct i2c_device_id *id)
463 struct mma9551_data *data;
464 struct iio_dev *indio_dev;
465 const char *name = NULL;
468 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
472 data = iio_priv(indio_dev);
473 i2c_set_clientdata(client, indio_dev);
474 data->client = client;
478 else if (ACPI_HANDLE(&client->dev))
479 name = mma9551_match_acpi_device(&client->dev);
481 ret = mma9551_init(data);
485 mutex_init(&data->mutex);
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;
494 ret = mma9551_gpio_probe(indio_dev);
498 ret = pm_runtime_set_active(&client->dev);
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);
507 ret = iio_device_register(indio_dev);
509 dev_err(&client->dev, "unable to register iio device\n");
516 mma9551_set_device_state(client, false);
521 static int mma9551_remove(struct i2c_client *client)
523 struct iio_dev *indio_dev = i2c_get_clientdata(client);
524 struct mma9551_data *data = iio_priv(indio_dev);
526 iio_device_unregister(indio_dev);
528 pm_runtime_disable(&client->dev);
529 pm_runtime_set_suspended(&client->dev);
530 pm_runtime_put_noidle(&client->dev);
532 mutex_lock(&data->mutex);
533 mma9551_set_device_state(data->client, false);
534 mutex_unlock(&data->mutex);
540 static int mma9551_runtime_suspend(struct device *dev)
542 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
543 struct mma9551_data *data = iio_priv(indio_dev);
546 mutex_lock(&data->mutex);
547 ret = mma9551_set_device_state(data->client, false);
548 mutex_unlock(&data->mutex);
550 dev_err(&data->client->dev, "powering off device failed\n");
557 static int mma9551_runtime_resume(struct device *dev)
559 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
560 struct mma9551_data *data = iio_priv(indio_dev);
563 ret = mma9551_set_device_state(data->client, true);
567 mma9551_sleep(MMA9551_DEFAULT_SAMPLE_RATE);
573 #ifdef CONFIG_PM_SLEEP
574 static int mma9551_suspend(struct device *dev)
576 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
577 struct mma9551_data *data = iio_priv(indio_dev);
580 mutex_lock(&data->mutex);
581 ret = mma9551_set_device_state(data->client, false);
582 mutex_unlock(&data->mutex);
587 static int mma9551_resume(struct device *dev)
589 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
590 struct mma9551_data *data = iio_priv(indio_dev);
593 mutex_lock(&data->mutex);
594 ret = mma9551_set_device_state(data->client, true);
595 mutex_unlock(&data->mutex);
601 static 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)
607 static const struct acpi_device_id mma9551_acpi_match[] = {
612 MODULE_DEVICE_TABLE(acpi, mma9551_acpi_match);
614 static const struct i2c_device_id mma9551_id[] = {
619 MODULE_DEVICE_TABLE(i2c, mma9551_id);
621 static struct i2c_driver mma9551_driver = {
623 .name = MMA9551_DRV_NAME,
624 .acpi_match_table = ACPI_PTR(mma9551_acpi_match),
625 .pm = &mma9551_pm_ops,
627 .probe = mma9551_probe,
628 .remove = mma9551_remove,
629 .id_table = mma9551_id,
632 module_i2c_driver(mma9551_driver);
634 MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>");
635 MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>");
636 MODULE_LICENSE("GPL v2");
637 MODULE_DESCRIPTION("MMA9551L motion-sensing platform driver");