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Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-bionic-kernel.git] / drivers / iio / accel / mma8452.c
1 /*
2 * mma8452.c - Support for following Freescale / NXP 3-axis accelerometers:
3 *
4 * device name digital output 7-bit I2C slave address (pin selectable)
5 * ---------------------------------------------------------------------
6 * MMA8451Q 14 bit 0x1c / 0x1d
7 * MMA8452Q 12 bit 0x1c / 0x1d
8 * MMA8453Q 10 bit 0x1c / 0x1d
9 * MMA8652FC 12 bit 0x1d
10 * MMA8653FC 10 bit 0x1d
11 * FXLS8471Q 14 bit 0x1e / 0x1d / 0x1c / 0x1f
12 *
13 * Copyright 2015 Martin Kepplinger <martink@posteo.de>
14 * Copyright 2014 Peter Meerwald <pmeerw@pmeerw.net>
15 *
16 * This file is subject to the terms and conditions of version 2 of
17 * the GNU General Public License. See the file COPYING in the main
18 * directory of this archive for more details.
19 *
20 * TODO: orientation events
21 */
22
23 #include <linux/module.h>
24 #include <linux/i2c.h>
25 #include <linux/iio/iio.h>
26 #include <linux/iio/sysfs.h>
27 #include <linux/iio/buffer.h>
28 #include <linux/iio/trigger.h>
29 #include <linux/iio/trigger_consumer.h>
30 #include <linux/iio/triggered_buffer.h>
31 #include <linux/iio/events.h>
32 #include <linux/delay.h>
33 #include <linux/of_device.h>
34 #include <linux/of_irq.h>
35 #include <linux/pm_runtime.h>
36
37 #define MMA8452_STATUS 0x00
38 #define MMA8452_STATUS_DRDY (BIT(2) | BIT(1) | BIT(0))
39 #define MMA8452_OUT_X 0x01 /* MSB first */
40 #define MMA8452_OUT_Y 0x03
41 #define MMA8452_OUT_Z 0x05
42 #define MMA8452_INT_SRC 0x0c
43 #define MMA8452_WHO_AM_I 0x0d
44 #define MMA8452_DATA_CFG 0x0e
45 #define MMA8452_DATA_CFG_FS_MASK GENMASK(1, 0)
46 #define MMA8452_DATA_CFG_FS_2G 0
47 #define MMA8452_DATA_CFG_FS_4G 1
48 #define MMA8452_DATA_CFG_FS_8G 2
49 #define MMA8452_DATA_CFG_HPF_MASK BIT(4)
50 #define MMA8452_HP_FILTER_CUTOFF 0x0f
51 #define MMA8452_HP_FILTER_CUTOFF_SEL_MASK GENMASK(1, 0)
52 #define MMA8452_FF_MT_CFG 0x15
53 #define MMA8452_FF_MT_CFG_OAE BIT(6)
54 #define MMA8452_FF_MT_CFG_ELE BIT(7)
55 #define MMA8452_FF_MT_SRC 0x16
56 #define MMA8452_FF_MT_SRC_XHE BIT(1)
57 #define MMA8452_FF_MT_SRC_YHE BIT(3)
58 #define MMA8452_FF_MT_SRC_ZHE BIT(5)
59 #define MMA8452_FF_MT_THS 0x17
60 #define MMA8452_FF_MT_THS_MASK 0x7f
61 #define MMA8452_FF_MT_COUNT 0x18
62 #define MMA8452_FF_MT_CHAN_SHIFT 3
63 #define MMA8452_TRANSIENT_CFG 0x1d
64 #define MMA8452_TRANSIENT_CFG_CHAN(chan) BIT(chan + 1)
65 #define MMA8452_TRANSIENT_CFG_HPF_BYP BIT(0)
66 #define MMA8452_TRANSIENT_CFG_ELE BIT(4)
67 #define MMA8452_TRANSIENT_SRC 0x1e
68 #define MMA8452_TRANSIENT_SRC_XTRANSE BIT(1)
69 #define MMA8452_TRANSIENT_SRC_YTRANSE BIT(3)
70 #define MMA8452_TRANSIENT_SRC_ZTRANSE BIT(5)
71 #define MMA8452_TRANSIENT_THS 0x1f
72 #define MMA8452_TRANSIENT_THS_MASK GENMASK(6, 0)
73 #define MMA8452_TRANSIENT_COUNT 0x20
74 #define MMA8452_TRANSIENT_CHAN_SHIFT 1
75 #define MMA8452_CTRL_REG1 0x2a
76 #define MMA8452_CTRL_ACTIVE BIT(0)
77 #define MMA8452_CTRL_DR_MASK GENMASK(5, 3)
78 #define MMA8452_CTRL_DR_SHIFT 3
79 #define MMA8452_CTRL_DR_DEFAULT 0x4 /* 50 Hz sample frequency */
80 #define MMA8452_CTRL_REG2 0x2b
81 #define MMA8452_CTRL_REG2_RST BIT(6)
82 #define MMA8452_CTRL_REG2_MODS_SHIFT 3
83 #define MMA8452_CTRL_REG2_MODS_MASK 0x1b
84 #define MMA8452_CTRL_REG4 0x2d
85 #define MMA8452_CTRL_REG5 0x2e
86 #define MMA8452_OFF_X 0x2f
87 #define MMA8452_OFF_Y 0x30
88 #define MMA8452_OFF_Z 0x31
89
90 #define MMA8452_MAX_REG 0x31
91
92 #define MMA8452_INT_DRDY BIT(0)
93 #define MMA8452_INT_FF_MT BIT(2)
94 #define MMA8452_INT_TRANS BIT(5)
95
96 #define MMA8451_DEVICE_ID 0x1a
97 #define MMA8452_DEVICE_ID 0x2a
98 #define MMA8453_DEVICE_ID 0x3a
99 #define MMA8652_DEVICE_ID 0x4a
100 #define MMA8653_DEVICE_ID 0x5a
101 #define FXLS8471_DEVICE_ID 0x6a
102
103 #define MMA8452_AUTO_SUSPEND_DELAY_MS 2000
104
105 struct mma8452_data {
106 struct i2c_client *client;
107 struct mutex lock;
108 u8 ctrl_reg1;
109 u8 data_cfg;
110 const struct mma_chip_info *chip_info;
111 };
112
113 /**
114 * struct mma8452_event_regs - chip specific data related to events
115 * @ev_cfg: event config register address
116 * @ev_cfg_ele: latch bit in event config register
117 * @ev_cfg_chan_shift: number of the bit to enable events in X
118 * direction; in event config register
119 * @ev_src: event source register address
120 * @ev_ths: event threshold register address
121 * @ev_ths_mask: mask for the threshold value
122 * @ev_count: event count (period) register address
123 *
124 * Since not all chips supported by the driver support comparing high pass
125 * filtered data for events (interrupts), different interrupt sources are
126 * used for different chips and the relevant registers are included here.
127 */
128 struct mma8452_event_regs {
129 u8 ev_cfg;
130 u8 ev_cfg_ele;
131 u8 ev_cfg_chan_shift;
132 u8 ev_src;
133 u8 ev_ths;
134 u8 ev_ths_mask;
135 u8 ev_count;
136 };
137
138 static const struct mma8452_event_regs ev_regs_accel_falling = {
139 .ev_cfg = MMA8452_FF_MT_CFG,
140 .ev_cfg_ele = MMA8452_FF_MT_CFG_ELE,
141 .ev_cfg_chan_shift = MMA8452_FF_MT_CHAN_SHIFT,
142 .ev_src = MMA8452_FF_MT_SRC,
143 .ev_ths = MMA8452_FF_MT_THS,
144 .ev_ths_mask = MMA8452_FF_MT_THS_MASK,
145 .ev_count = MMA8452_FF_MT_COUNT
146 };
147
148 static const struct mma8452_event_regs ev_regs_accel_rising = {
149 .ev_cfg = MMA8452_TRANSIENT_CFG,
150 .ev_cfg_ele = MMA8452_TRANSIENT_CFG_ELE,
151 .ev_cfg_chan_shift = MMA8452_TRANSIENT_CHAN_SHIFT,
152 .ev_src = MMA8452_TRANSIENT_SRC,
153 .ev_ths = MMA8452_TRANSIENT_THS,
154 .ev_ths_mask = MMA8452_TRANSIENT_THS_MASK,
155 .ev_count = MMA8452_TRANSIENT_COUNT,
156 };
157
158 /**
159 * struct mma_chip_info - chip specific data
160 * @chip_id: WHO_AM_I register's value
161 * @channels: struct iio_chan_spec matching the device's
162 * capabilities
163 * @num_channels: number of channels
164 * @mma_scales: scale factors for converting register values
165 * to m/s^2; 3 modes: 2g, 4g, 8g; 2 integers
166 * per mode: m/s^2 and micro m/s^2
167 * @all_events: all events supported by this chip
168 * @enabled_events: event flags enabled and handled by this driver
169 */
170 struct mma_chip_info {
171 u8 chip_id;
172 const struct iio_chan_spec *channels;
173 int num_channels;
174 const int mma_scales[3][2];
175 int all_events;
176 int enabled_events;
177 };
178
179 enum {
180 idx_x,
181 idx_y,
182 idx_z,
183 idx_ts,
184 };
185
186 static int mma8452_drdy(struct mma8452_data *data)
187 {
188 int tries = 150;
189
190 while (tries-- > 0) {
191 int ret = i2c_smbus_read_byte_data(data->client,
192 MMA8452_STATUS);
193 if (ret < 0)
194 return ret;
195 if ((ret & MMA8452_STATUS_DRDY) == MMA8452_STATUS_DRDY)
196 return 0;
197
198 msleep(20);
199 }
200
201 dev_err(&data->client->dev, "data not ready\n");
202
203 return -EIO;
204 }
205
206 static int mma8452_set_runtime_pm_state(struct i2c_client *client, bool on)
207 {
208 #ifdef CONFIG_PM
209 int ret;
210
211 if (on) {
212 ret = pm_runtime_get_sync(&client->dev);
213 } else {
214 pm_runtime_mark_last_busy(&client->dev);
215 ret = pm_runtime_put_autosuspend(&client->dev);
216 }
217
218 if (ret < 0) {
219 dev_err(&client->dev,
220 "failed to change power state to %d\n", on);
221 if (on)
222 pm_runtime_put_noidle(&client->dev);
223
224 return ret;
225 }
226 #endif
227
228 return 0;
229 }
230
231 static int mma8452_read(struct mma8452_data *data, __be16 buf[3])
232 {
233 int ret = mma8452_drdy(data);
234
235 if (ret < 0)
236 return ret;
237
238 ret = mma8452_set_runtime_pm_state(data->client, true);
239 if (ret)
240 return ret;
241
242 ret = i2c_smbus_read_i2c_block_data(data->client, MMA8452_OUT_X,
243 3 * sizeof(__be16), (u8 *)buf);
244
245 ret = mma8452_set_runtime_pm_state(data->client, false);
246
247 return ret;
248 }
249
250 static ssize_t mma8452_show_int_plus_micros(char *buf, const int (*vals)[2],
251 int n)
252 {
253 size_t len = 0;
254
255 while (n-- > 0)
256 len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06d ",
257 vals[n][0], vals[n][1]);
258
259 /* replace trailing space by newline */
260 buf[len - 1] = '\n';
261
262 return len;
263 }
264
265 static int mma8452_get_int_plus_micros_index(const int (*vals)[2], int n,
266 int val, int val2)
267 {
268 while (n-- > 0)
269 if (val == vals[n][0] && val2 == vals[n][1])
270 return n;
271
272 return -EINVAL;
273 }
274
275 static unsigned int mma8452_get_odr_index(struct mma8452_data *data)
276 {
277 return (data->ctrl_reg1 & MMA8452_CTRL_DR_MASK) >>
278 MMA8452_CTRL_DR_SHIFT;
279 }
280
281 static const int mma8452_samp_freq[8][2] = {
282 {800, 0}, {400, 0}, {200, 0}, {100, 0}, {50, 0}, {12, 500000},
283 {6, 250000}, {1, 560000}
284 };
285
286 /* Datasheet table: step time "Relationship with the ODR" (sample frequency) */
287 static const unsigned int mma8452_transient_time_step_us[4][8] = {
288 { 1250, 2500, 5000, 10000, 20000, 20000, 20000, 20000 }, /* normal */
289 { 1250, 2500, 5000, 10000, 20000, 80000, 80000, 80000 }, /* l p l n */
290 { 1250, 2500, 2500, 2500, 2500, 2500, 2500, 2500 }, /* high res*/
291 { 1250, 2500, 5000, 10000, 20000, 80000, 160000, 160000 } /* l p */
292 };
293
294 /* Datasheet table "High-Pass Filter Cutoff Options" */
295 static const int mma8452_hp_filter_cutoff[4][8][4][2] = {
296 { /* normal */
297 { {16, 0}, {8, 0}, {4, 0}, {2, 0} }, /* 800 Hz sample */
298 { {16, 0}, {8, 0}, {4, 0}, {2, 0} }, /* 400 Hz sample */
299 { {8, 0}, {4, 0}, {2, 0}, {1, 0} }, /* 200 Hz sample */
300 { {4, 0}, {2, 0}, {1, 0}, {0, 500000} }, /* 100 Hz sample */
301 { {2, 0}, {1, 0}, {0, 500000}, {0, 250000} }, /* 50 Hz sample */
302 { {2, 0}, {1, 0}, {0, 500000}, {0, 250000} }, /* 12.5 Hz sample */
303 { {2, 0}, {1, 0}, {0, 500000}, {0, 250000} }, /* 6.25 Hz sample */
304 { {2, 0}, {1, 0}, {0, 500000}, {0, 250000} } /* 1.56 Hz sample */
305 },
306 { /* low noise low power */
307 { {16, 0}, {8, 0}, {4, 0}, {2, 0} },
308 { {16, 0}, {8, 0}, {4, 0}, {2, 0} },
309 { {8, 0}, {4, 0}, {2, 0}, {1, 0} },
310 { {4, 0}, {2, 0}, {1, 0}, {0, 500000} },
311 { {2, 0}, {1, 0}, {0, 500000}, {0, 250000} },
312 { {0, 500000}, {0, 250000}, {0, 125000}, {0, 063000} },
313 { {0, 500000}, {0, 250000}, {0, 125000}, {0, 063000} },
314 { {0, 500000}, {0, 250000}, {0, 125000}, {0, 063000} }
315 },
316 { /* high resolution */
317 { {16, 0}, {8, 0}, {4, 0}, {2, 0} },
318 { {16, 0}, {8, 0}, {4, 0}, {2, 0} },
319 { {16, 0}, {8, 0}, {4, 0}, {2, 0} },
320 { {16, 0}, {8, 0}, {4, 0}, {2, 0} },
321 { {16, 0}, {8, 0}, {4, 0}, {2, 0} },
322 { {16, 0}, {8, 0}, {4, 0}, {2, 0} },
323 { {16, 0}, {8, 0}, {4, 0}, {2, 0} },
324 { {16, 0}, {8, 0}, {4, 0}, {2, 0} }
325 },
326 { /* low power */
327 { {16, 0}, {8, 0}, {4, 0}, {2, 0} },
328 { {8, 0}, {4, 0}, {2, 0}, {1, 0} },
329 { {4, 0}, {2, 0}, {1, 0}, {0, 500000} },
330 { {2, 0}, {1, 0}, {0, 500000}, {0, 250000} },
331 { {1, 0}, {0, 500000}, {0, 250000}, {0, 125000} },
332 { {0, 250000}, {0, 125000}, {0, 063000}, {0, 031000} },
333 { {0, 250000}, {0, 125000}, {0, 063000}, {0, 031000} },
334 { {0, 250000}, {0, 125000}, {0, 063000}, {0, 031000} }
335 }
336 };
337
338 /* Datasheet table "MODS Oversampling modes averaging values at each ODR" */
339 static const u16 mma8452_os_ratio[4][8] = {
340 /* 800 Hz, 400 Hz, ... , 1.56 Hz */
341 { 2, 4, 4, 4, 4, 16, 32, 128 }, /* normal */
342 { 2, 4, 4, 4, 4, 4, 8, 32 }, /* low power low noise */
343 { 2, 4, 8, 16, 32, 128, 256, 1024 }, /* high resolution */
344 { 2, 2, 2, 2, 2, 2, 4, 16 } /* low power */
345 };
346
347 static int mma8452_get_power_mode(struct mma8452_data *data)
348 {
349 int reg;
350
351 reg = i2c_smbus_read_byte_data(data->client,
352 MMA8452_CTRL_REG2);
353 if (reg < 0)
354 return reg;
355
356 return ((reg & MMA8452_CTRL_REG2_MODS_MASK) >>
357 MMA8452_CTRL_REG2_MODS_SHIFT);
358 }
359
360 static ssize_t mma8452_show_samp_freq_avail(struct device *dev,
361 struct device_attribute *attr,
362 char *buf)
363 {
364 return mma8452_show_int_plus_micros(buf, mma8452_samp_freq,
365 ARRAY_SIZE(mma8452_samp_freq));
366 }
367
368 static ssize_t mma8452_show_scale_avail(struct device *dev,
369 struct device_attribute *attr,
370 char *buf)
371 {
372 struct mma8452_data *data = iio_priv(i2c_get_clientdata(
373 to_i2c_client(dev)));
374
375 return mma8452_show_int_plus_micros(buf, data->chip_info->mma_scales,
376 ARRAY_SIZE(data->chip_info->mma_scales));
377 }
378
379 static ssize_t mma8452_show_hp_cutoff_avail(struct device *dev,
380 struct device_attribute *attr,
381 char *buf)
382 {
383 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
384 struct mma8452_data *data = iio_priv(indio_dev);
385 int i, j;
386
387 i = mma8452_get_odr_index(data);
388 j = mma8452_get_power_mode(data);
389 if (j < 0)
390 return j;
391
392 return mma8452_show_int_plus_micros(buf, mma8452_hp_filter_cutoff[j][i],
393 ARRAY_SIZE(mma8452_hp_filter_cutoff[0][0]));
394 }
395
396 static ssize_t mma8452_show_os_ratio_avail(struct device *dev,
397 struct device_attribute *attr,
398 char *buf)
399 {
400 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
401 struct mma8452_data *data = iio_priv(indio_dev);
402 int i = mma8452_get_odr_index(data);
403 int j;
404 u16 val = 0;
405 size_t len = 0;
406
407 for (j = 0; j < ARRAY_SIZE(mma8452_os_ratio); j++) {
408 if (val == mma8452_os_ratio[j][i])
409 continue;
410
411 val = mma8452_os_ratio[j][i];
412
413 len += scnprintf(buf + len, PAGE_SIZE - len, "%d ", val);
414 }
415 buf[len - 1] = '\n';
416
417 return len;
418 }
419
420 static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(mma8452_show_samp_freq_avail);
421 static IIO_DEVICE_ATTR(in_accel_scale_available, 0444,
422 mma8452_show_scale_avail, NULL, 0);
423 static IIO_DEVICE_ATTR(in_accel_filter_high_pass_3db_frequency_available,
424 0444, mma8452_show_hp_cutoff_avail, NULL, 0);
425 static IIO_DEVICE_ATTR(in_accel_oversampling_ratio_available, 0444,
426 mma8452_show_os_ratio_avail, NULL, 0);
427
428 static int mma8452_get_samp_freq_index(struct mma8452_data *data,
429 int val, int val2)
430 {
431 return mma8452_get_int_plus_micros_index(mma8452_samp_freq,
432 ARRAY_SIZE(mma8452_samp_freq),
433 val, val2);
434 }
435
436 static int mma8452_get_scale_index(struct mma8452_data *data, int val, int val2)
437 {
438 return mma8452_get_int_plus_micros_index(data->chip_info->mma_scales,
439 ARRAY_SIZE(data->chip_info->mma_scales), val, val2);
440 }
441
442 static int mma8452_get_hp_filter_index(struct mma8452_data *data,
443 int val, int val2)
444 {
445 int i, j;
446
447 i = mma8452_get_odr_index(data);
448 j = mma8452_get_power_mode(data);
449 if (j < 0)
450 return j;
451
452 return mma8452_get_int_plus_micros_index(mma8452_hp_filter_cutoff[j][i],
453 ARRAY_SIZE(mma8452_hp_filter_cutoff[0][0]), val, val2);
454 }
455
456 static int mma8452_read_hp_filter(struct mma8452_data *data, int *hz, int *uHz)
457 {
458 int j, i, ret;
459
460 ret = i2c_smbus_read_byte_data(data->client, MMA8452_HP_FILTER_CUTOFF);
461 if (ret < 0)
462 return ret;
463
464 i = mma8452_get_odr_index(data);
465 j = mma8452_get_power_mode(data);
466 if (j < 0)
467 return j;
468
469 ret &= MMA8452_HP_FILTER_CUTOFF_SEL_MASK;
470 *hz = mma8452_hp_filter_cutoff[j][i][ret][0];
471 *uHz = mma8452_hp_filter_cutoff[j][i][ret][1];
472
473 return 0;
474 }
475
476 static int mma8452_read_raw(struct iio_dev *indio_dev,
477 struct iio_chan_spec const *chan,
478 int *val, int *val2, long mask)
479 {
480 struct mma8452_data *data = iio_priv(indio_dev);
481 __be16 buffer[3];
482 int i, ret;
483
484 switch (mask) {
485 case IIO_CHAN_INFO_RAW:
486 ret = iio_device_claim_direct_mode(indio_dev);
487 if (ret)
488 return ret;
489
490 mutex_lock(&data->lock);
491 ret = mma8452_read(data, buffer);
492 mutex_unlock(&data->lock);
493 iio_device_release_direct_mode(indio_dev);
494 if (ret < 0)
495 return ret;
496
497 *val = sign_extend32(be16_to_cpu(
498 buffer[chan->scan_index]) >> chan->scan_type.shift,
499 chan->scan_type.realbits - 1);
500
501 return IIO_VAL_INT;
502 case IIO_CHAN_INFO_SCALE:
503 i = data->data_cfg & MMA8452_DATA_CFG_FS_MASK;
504 *val = data->chip_info->mma_scales[i][0];
505 *val2 = data->chip_info->mma_scales[i][1];
506
507 return IIO_VAL_INT_PLUS_MICRO;
508 case IIO_CHAN_INFO_SAMP_FREQ:
509 i = mma8452_get_odr_index(data);
510 *val = mma8452_samp_freq[i][0];
511 *val2 = mma8452_samp_freq[i][1];
512
513 return IIO_VAL_INT_PLUS_MICRO;
514 case IIO_CHAN_INFO_CALIBBIAS:
515 ret = i2c_smbus_read_byte_data(data->client,
516 MMA8452_OFF_X +
517 chan->scan_index);
518 if (ret < 0)
519 return ret;
520
521 *val = sign_extend32(ret, 7);
522
523 return IIO_VAL_INT;
524 case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY:
525 if (data->data_cfg & MMA8452_DATA_CFG_HPF_MASK) {
526 ret = mma8452_read_hp_filter(data, val, val2);
527 if (ret < 0)
528 return ret;
529 } else {
530 *val = 0;
531 *val2 = 0;
532 }
533
534 return IIO_VAL_INT_PLUS_MICRO;
535 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
536 ret = mma8452_get_power_mode(data);
537 if (ret < 0)
538 return ret;
539
540 i = mma8452_get_odr_index(data);
541
542 *val = mma8452_os_ratio[ret][i];
543 return IIO_VAL_INT;
544 }
545
546 return -EINVAL;
547 }
548
549 static int mma8452_standby(struct mma8452_data *data)
550 {
551 return i2c_smbus_write_byte_data(data->client, MMA8452_CTRL_REG1,
552 data->ctrl_reg1 & ~MMA8452_CTRL_ACTIVE);
553 }
554
555 static int mma8452_active(struct mma8452_data *data)
556 {
557 return i2c_smbus_write_byte_data(data->client, MMA8452_CTRL_REG1,
558 data->ctrl_reg1);
559 }
560
561 /* returns >0 if active, 0 if in standby and <0 on error */
562 static int mma8452_is_active(struct mma8452_data *data)
563 {
564 int reg;
565
566 reg = i2c_smbus_read_byte_data(data->client, MMA8452_CTRL_REG1);
567 if (reg < 0)
568 return reg;
569
570 return reg & MMA8452_CTRL_ACTIVE;
571 }
572
573 static int mma8452_change_config(struct mma8452_data *data, u8 reg, u8 val)
574 {
575 int ret;
576 int is_active;
577
578 mutex_lock(&data->lock);
579
580 is_active = mma8452_is_active(data);
581 if (is_active < 0) {
582 ret = is_active;
583 goto fail;
584 }
585
586 /* config can only be changed when in standby */
587 if (is_active > 0) {
588 ret = mma8452_standby(data);
589 if (ret < 0)
590 goto fail;
591 }
592
593 ret = i2c_smbus_write_byte_data(data->client, reg, val);
594 if (ret < 0)
595 goto fail;
596
597 if (is_active > 0) {
598 ret = mma8452_active(data);
599 if (ret < 0)
600 goto fail;
601 }
602
603 ret = 0;
604 fail:
605 mutex_unlock(&data->lock);
606
607 return ret;
608 }
609
610 static int mma8452_set_power_mode(struct mma8452_data *data, u8 mode)
611 {
612 int reg;
613
614 reg = i2c_smbus_read_byte_data(data->client,
615 MMA8452_CTRL_REG2);
616 if (reg < 0)
617 return reg;
618
619 reg &= ~MMA8452_CTRL_REG2_MODS_MASK;
620 reg |= mode << MMA8452_CTRL_REG2_MODS_SHIFT;
621
622 return mma8452_change_config(data, MMA8452_CTRL_REG2, reg);
623 }
624
625 /* returns >0 if in freefall mode, 0 if not or <0 if an error occurred */
626 static int mma8452_freefall_mode_enabled(struct mma8452_data *data)
627 {
628 int val;
629
630 val = i2c_smbus_read_byte_data(data->client, MMA8452_FF_MT_CFG);
631 if (val < 0)
632 return val;
633
634 return !(val & MMA8452_FF_MT_CFG_OAE);
635 }
636
637 static int mma8452_set_freefall_mode(struct mma8452_data *data, bool state)
638 {
639 int val;
640
641 if ((state && mma8452_freefall_mode_enabled(data)) ||
642 (!state && !(mma8452_freefall_mode_enabled(data))))
643 return 0;
644
645 val = i2c_smbus_read_byte_data(data->client, MMA8452_FF_MT_CFG);
646 if (val < 0)
647 return val;
648
649 if (state) {
650 val |= BIT(idx_x + MMA8452_FF_MT_CHAN_SHIFT);
651 val |= BIT(idx_y + MMA8452_FF_MT_CHAN_SHIFT);
652 val |= BIT(idx_z + MMA8452_FF_MT_CHAN_SHIFT);
653 val &= ~MMA8452_FF_MT_CFG_OAE;
654 } else {
655 val &= ~BIT(idx_x + MMA8452_FF_MT_CHAN_SHIFT);
656 val &= ~BIT(idx_y + MMA8452_FF_MT_CHAN_SHIFT);
657 val &= ~BIT(idx_z + MMA8452_FF_MT_CHAN_SHIFT);
658 val |= MMA8452_FF_MT_CFG_OAE;
659 }
660
661 return mma8452_change_config(data, MMA8452_FF_MT_CFG, val);
662 }
663
664 static int mma8452_set_hp_filter_frequency(struct mma8452_data *data,
665 int val, int val2)
666 {
667 int i, reg;
668
669 i = mma8452_get_hp_filter_index(data, val, val2);
670 if (i < 0)
671 return i;
672
673 reg = i2c_smbus_read_byte_data(data->client,
674 MMA8452_HP_FILTER_CUTOFF);
675 if (reg < 0)
676 return reg;
677
678 reg &= ~MMA8452_HP_FILTER_CUTOFF_SEL_MASK;
679 reg |= i;
680
681 return mma8452_change_config(data, MMA8452_HP_FILTER_CUTOFF, reg);
682 }
683
684 static int mma8452_write_raw(struct iio_dev *indio_dev,
685 struct iio_chan_spec const *chan,
686 int val, int val2, long mask)
687 {
688 struct mma8452_data *data = iio_priv(indio_dev);
689 int i, ret;
690
691 ret = iio_device_claim_direct_mode(indio_dev);
692 if (ret)
693 return ret;
694
695 switch (mask) {
696 case IIO_CHAN_INFO_SAMP_FREQ:
697 i = mma8452_get_samp_freq_index(data, val, val2);
698 if (i < 0) {
699 ret = i;
700 break;
701 }
702 data->ctrl_reg1 &= ~MMA8452_CTRL_DR_MASK;
703 data->ctrl_reg1 |= i << MMA8452_CTRL_DR_SHIFT;
704
705 ret = mma8452_change_config(data, MMA8452_CTRL_REG1,
706 data->ctrl_reg1);
707 break;
708 case IIO_CHAN_INFO_SCALE:
709 i = mma8452_get_scale_index(data, val, val2);
710 if (i < 0) {
711 ret = i;
712 break;
713 }
714
715 data->data_cfg &= ~MMA8452_DATA_CFG_FS_MASK;
716 data->data_cfg |= i;
717
718 ret = mma8452_change_config(data, MMA8452_DATA_CFG,
719 data->data_cfg);
720 break;
721 case IIO_CHAN_INFO_CALIBBIAS:
722 if (val < -128 || val > 127) {
723 ret = -EINVAL;
724 break;
725 }
726
727 ret = mma8452_change_config(data,
728 MMA8452_OFF_X + chan->scan_index,
729 val);
730 break;
731
732 case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY:
733 if (val == 0 && val2 == 0) {
734 data->data_cfg &= ~MMA8452_DATA_CFG_HPF_MASK;
735 } else {
736 data->data_cfg |= MMA8452_DATA_CFG_HPF_MASK;
737 ret = mma8452_set_hp_filter_frequency(data, val, val2);
738 if (ret < 0)
739 break;
740 }
741
742 ret = mma8452_change_config(data, MMA8452_DATA_CFG,
743 data->data_cfg);
744 break;
745
746 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
747 ret = mma8452_get_odr_index(data);
748
749 for (i = 0; i < ARRAY_SIZE(mma8452_os_ratio); i++) {
750 if (mma8452_os_ratio[i][ret] == val) {
751 ret = mma8452_set_power_mode(data, i);
752 break;
753 }
754 }
755 break;
756 default:
757 ret = -EINVAL;
758 break;
759 }
760
761 iio_device_release_direct_mode(indio_dev);
762 return ret;
763 }
764
765 static int mma8452_get_event_regs(struct mma8452_data *data,
766 const struct iio_chan_spec *chan, enum iio_event_direction dir,
767 const struct mma8452_event_regs **ev_reg)
768 {
769 if (!chan)
770 return -EINVAL;
771
772 switch (chan->type) {
773 case IIO_ACCEL:
774 switch (dir) {
775 case IIO_EV_DIR_RISING:
776 if ((data->chip_info->all_events
777 & MMA8452_INT_TRANS) &&
778 (data->chip_info->enabled_events
779 & MMA8452_INT_TRANS))
780 *ev_reg = &ev_regs_accel_rising;
781 else
782 *ev_reg = &ev_regs_accel_falling;
783 return 0;
784 case IIO_EV_DIR_FALLING:
785 *ev_reg = &ev_regs_accel_falling;
786 return 0;
787 default:
788 return -EINVAL;
789 }
790 default:
791 return -EINVAL;
792 }
793 }
794
795 static int mma8452_read_event_value(struct iio_dev *indio_dev,
796 const struct iio_chan_spec *chan,
797 enum iio_event_type type,
798 enum iio_event_direction dir,
799 enum iio_event_info info,
800 int *val, int *val2)
801 {
802 struct mma8452_data *data = iio_priv(indio_dev);
803 int ret, us, power_mode;
804 const struct mma8452_event_regs *ev_regs;
805
806 ret = mma8452_get_event_regs(data, chan, dir, &ev_regs);
807 if (ret)
808 return ret;
809
810 switch (info) {
811 case IIO_EV_INFO_VALUE:
812 ret = i2c_smbus_read_byte_data(data->client, ev_regs->ev_ths);
813 if (ret < 0)
814 return ret;
815
816 *val = ret & ev_regs->ev_ths_mask;
817
818 return IIO_VAL_INT;
819
820 case IIO_EV_INFO_PERIOD:
821 ret = i2c_smbus_read_byte_data(data->client, ev_regs->ev_count);
822 if (ret < 0)
823 return ret;
824
825 power_mode = mma8452_get_power_mode(data);
826 if (power_mode < 0)
827 return power_mode;
828
829 us = ret * mma8452_transient_time_step_us[power_mode][
830 mma8452_get_odr_index(data)];
831 *val = us / USEC_PER_SEC;
832 *val2 = us % USEC_PER_SEC;
833
834 return IIO_VAL_INT_PLUS_MICRO;
835
836 case IIO_EV_INFO_HIGH_PASS_FILTER_3DB:
837 ret = i2c_smbus_read_byte_data(data->client,
838 MMA8452_TRANSIENT_CFG);
839 if (ret < 0)
840 return ret;
841
842 if (ret & MMA8452_TRANSIENT_CFG_HPF_BYP) {
843 *val = 0;
844 *val2 = 0;
845 } else {
846 ret = mma8452_read_hp_filter(data, val, val2);
847 if (ret < 0)
848 return ret;
849 }
850
851 return IIO_VAL_INT_PLUS_MICRO;
852
853 default:
854 return -EINVAL;
855 }
856 }
857
858 static int mma8452_write_event_value(struct iio_dev *indio_dev,
859 const struct iio_chan_spec *chan,
860 enum iio_event_type type,
861 enum iio_event_direction dir,
862 enum iio_event_info info,
863 int val, int val2)
864 {
865 struct mma8452_data *data = iio_priv(indio_dev);
866 int ret, reg, steps;
867 const struct mma8452_event_regs *ev_regs;
868
869 ret = mma8452_get_event_regs(data, chan, dir, &ev_regs);
870 if (ret)
871 return ret;
872
873 switch (info) {
874 case IIO_EV_INFO_VALUE:
875 if (val < 0 || val > ev_regs->ev_ths_mask)
876 return -EINVAL;
877
878 return mma8452_change_config(data, ev_regs->ev_ths, val);
879
880 case IIO_EV_INFO_PERIOD:
881 ret = mma8452_get_power_mode(data);
882 if (ret < 0)
883 return ret;
884
885 steps = (val * USEC_PER_SEC + val2) /
886 mma8452_transient_time_step_us[ret][
887 mma8452_get_odr_index(data)];
888
889 if (steps < 0 || steps > 0xff)
890 return -EINVAL;
891
892 return mma8452_change_config(data, ev_regs->ev_count, steps);
893
894 case IIO_EV_INFO_HIGH_PASS_FILTER_3DB:
895 reg = i2c_smbus_read_byte_data(data->client,
896 MMA8452_TRANSIENT_CFG);
897 if (reg < 0)
898 return reg;
899
900 if (val == 0 && val2 == 0) {
901 reg |= MMA8452_TRANSIENT_CFG_HPF_BYP;
902 } else {
903 reg &= ~MMA8452_TRANSIENT_CFG_HPF_BYP;
904 ret = mma8452_set_hp_filter_frequency(data, val, val2);
905 if (ret < 0)
906 return ret;
907 }
908
909 return mma8452_change_config(data, MMA8452_TRANSIENT_CFG, reg);
910
911 default:
912 return -EINVAL;
913 }
914 }
915
916 static int mma8452_read_event_config(struct iio_dev *indio_dev,
917 const struct iio_chan_spec *chan,
918 enum iio_event_type type,
919 enum iio_event_direction dir)
920 {
921 struct mma8452_data *data = iio_priv(indio_dev);
922 int ret;
923 const struct mma8452_event_regs *ev_regs;
924
925 ret = mma8452_get_event_regs(data, chan, dir, &ev_regs);
926 if (ret)
927 return ret;
928
929 switch (dir) {
930 case IIO_EV_DIR_FALLING:
931 return mma8452_freefall_mode_enabled(data);
932 case IIO_EV_DIR_RISING:
933 ret = i2c_smbus_read_byte_data(data->client,
934 ev_regs->ev_cfg);
935 if (ret < 0)
936 return ret;
937
938 return !!(ret & BIT(chan->scan_index +
939 ev_regs->ev_cfg_chan_shift));
940 default:
941 return -EINVAL;
942 }
943 }
944
945 static int mma8452_write_event_config(struct iio_dev *indio_dev,
946 const struct iio_chan_spec *chan,
947 enum iio_event_type type,
948 enum iio_event_direction dir,
949 int state)
950 {
951 struct mma8452_data *data = iio_priv(indio_dev);
952 int val, ret;
953 const struct mma8452_event_regs *ev_regs;
954
955 ret = mma8452_get_event_regs(data, chan, dir, &ev_regs);
956 if (ret)
957 return ret;
958
959 ret = mma8452_set_runtime_pm_state(data->client, state);
960 if (ret)
961 return ret;
962
963 switch (dir) {
964 case IIO_EV_DIR_FALLING:
965 return mma8452_set_freefall_mode(data, state);
966 case IIO_EV_DIR_RISING:
967 val = i2c_smbus_read_byte_data(data->client, ev_regs->ev_cfg);
968 if (val < 0)
969 return val;
970
971 if (state) {
972 if (mma8452_freefall_mode_enabled(data)) {
973 val &= ~BIT(idx_x + ev_regs->ev_cfg_chan_shift);
974 val &= ~BIT(idx_y + ev_regs->ev_cfg_chan_shift);
975 val &= ~BIT(idx_z + ev_regs->ev_cfg_chan_shift);
976 val |= MMA8452_FF_MT_CFG_OAE;
977 }
978 val |= BIT(chan->scan_index +
979 ev_regs->ev_cfg_chan_shift);
980 } else {
981 if (mma8452_freefall_mode_enabled(data))
982 return 0;
983
984 val &= ~BIT(chan->scan_index +
985 ev_regs->ev_cfg_chan_shift);
986 }
987
988 val |= ev_regs->ev_cfg_ele;
989
990 return mma8452_change_config(data, ev_regs->ev_cfg, val);
991 default:
992 return -EINVAL;
993 }
994 }
995
996 static void mma8452_transient_interrupt(struct iio_dev *indio_dev)
997 {
998 struct mma8452_data *data = iio_priv(indio_dev);
999 s64 ts = iio_get_time_ns(indio_dev);
1000 int src;
1001
1002 src = i2c_smbus_read_byte_data(data->client, MMA8452_TRANSIENT_SRC);
1003 if (src < 0)
1004 return;
1005
1006 if (src & MMA8452_TRANSIENT_SRC_XTRANSE)
1007 iio_push_event(indio_dev,
1008 IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_X,
1009 IIO_EV_TYPE_MAG,
1010 IIO_EV_DIR_RISING),
1011 ts);
1012
1013 if (src & MMA8452_TRANSIENT_SRC_YTRANSE)
1014 iio_push_event(indio_dev,
1015 IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_Y,
1016 IIO_EV_TYPE_MAG,
1017 IIO_EV_DIR_RISING),
1018 ts);
1019
1020 if (src & MMA8452_TRANSIENT_SRC_ZTRANSE)
1021 iio_push_event(indio_dev,
1022 IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_Z,
1023 IIO_EV_TYPE_MAG,
1024 IIO_EV_DIR_RISING),
1025 ts);
1026 }
1027
1028 static irqreturn_t mma8452_interrupt(int irq, void *p)
1029 {
1030 struct iio_dev *indio_dev = p;
1031 struct mma8452_data *data = iio_priv(indio_dev);
1032 int ret = IRQ_NONE;
1033 int src;
1034
1035 src = i2c_smbus_read_byte_data(data->client, MMA8452_INT_SRC);
1036 if (src < 0)
1037 return IRQ_NONE;
1038
1039 if (!(src & data->chip_info->enabled_events))
1040 return IRQ_NONE;
1041
1042 if (src & MMA8452_INT_DRDY) {
1043 iio_trigger_poll_chained(indio_dev->trig);
1044 ret = IRQ_HANDLED;
1045 }
1046
1047 if (src & MMA8452_INT_FF_MT) {
1048 if (mma8452_freefall_mode_enabled(data)) {
1049 s64 ts = iio_get_time_ns(indio_dev);
1050
1051 iio_push_event(indio_dev,
1052 IIO_MOD_EVENT_CODE(IIO_ACCEL, 0,
1053 IIO_MOD_X_AND_Y_AND_Z,
1054 IIO_EV_TYPE_MAG,
1055 IIO_EV_DIR_FALLING),
1056 ts);
1057 }
1058 ret = IRQ_HANDLED;
1059 }
1060
1061 if (src & MMA8452_INT_TRANS) {
1062 mma8452_transient_interrupt(indio_dev);
1063 ret = IRQ_HANDLED;
1064 }
1065
1066 return ret;
1067 }
1068
1069 static irqreturn_t mma8452_trigger_handler(int irq, void *p)
1070 {
1071 struct iio_poll_func *pf = p;
1072 struct iio_dev *indio_dev = pf->indio_dev;
1073 struct mma8452_data *data = iio_priv(indio_dev);
1074 u8 buffer[16]; /* 3 16-bit channels + padding + ts */
1075 int ret;
1076
1077 ret = mma8452_read(data, (__be16 *)buffer);
1078 if (ret < 0)
1079 goto done;
1080
1081 iio_push_to_buffers_with_timestamp(indio_dev, buffer,
1082 iio_get_time_ns(indio_dev));
1083
1084 done:
1085 iio_trigger_notify_done(indio_dev->trig);
1086
1087 return IRQ_HANDLED;
1088 }
1089
1090 static int mma8452_reg_access_dbg(struct iio_dev *indio_dev,
1091 unsigned int reg, unsigned int writeval,
1092 unsigned int *readval)
1093 {
1094 int ret;
1095 struct mma8452_data *data = iio_priv(indio_dev);
1096
1097 if (reg > MMA8452_MAX_REG)
1098 return -EINVAL;
1099
1100 if (!readval)
1101 return mma8452_change_config(data, reg, writeval);
1102
1103 ret = i2c_smbus_read_byte_data(data->client, reg);
1104 if (ret < 0)
1105 return ret;
1106
1107 *readval = ret;
1108
1109 return 0;
1110 }
1111
1112 static const struct iio_event_spec mma8452_freefall_event[] = {
1113 {
1114 .type = IIO_EV_TYPE_MAG,
1115 .dir = IIO_EV_DIR_FALLING,
1116 .mask_separate = BIT(IIO_EV_INFO_ENABLE),
1117 .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) |
1118 BIT(IIO_EV_INFO_PERIOD) |
1119 BIT(IIO_EV_INFO_HIGH_PASS_FILTER_3DB)
1120 },
1121 };
1122
1123 static const struct iio_event_spec mma8652_freefall_event[] = {
1124 {
1125 .type = IIO_EV_TYPE_MAG,
1126 .dir = IIO_EV_DIR_FALLING,
1127 .mask_separate = BIT(IIO_EV_INFO_ENABLE),
1128 .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) |
1129 BIT(IIO_EV_INFO_PERIOD)
1130 },
1131 };
1132
1133 static const struct iio_event_spec mma8452_transient_event[] = {
1134 {
1135 .type = IIO_EV_TYPE_MAG,
1136 .dir = IIO_EV_DIR_RISING,
1137 .mask_separate = BIT(IIO_EV_INFO_ENABLE),
1138 .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) |
1139 BIT(IIO_EV_INFO_PERIOD) |
1140 BIT(IIO_EV_INFO_HIGH_PASS_FILTER_3DB)
1141 },
1142 };
1143
1144 static const struct iio_event_spec mma8452_motion_event[] = {
1145 {
1146 .type = IIO_EV_TYPE_MAG,
1147 .dir = IIO_EV_DIR_RISING,
1148 .mask_separate = BIT(IIO_EV_INFO_ENABLE),
1149 .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) |
1150 BIT(IIO_EV_INFO_PERIOD)
1151 },
1152 };
1153
1154 /*
1155 * Threshold is configured in fixed 8G/127 steps regardless of
1156 * currently selected scale for measurement.
1157 */
1158 static IIO_CONST_ATTR_NAMED(accel_transient_scale, in_accel_scale, "0.617742");
1159
1160 static struct attribute *mma8452_event_attributes[] = {
1161 &iio_const_attr_accel_transient_scale.dev_attr.attr,
1162 NULL,
1163 };
1164
1165 static struct attribute_group mma8452_event_attribute_group = {
1166 .attrs = mma8452_event_attributes,
1167 };
1168
1169 #define MMA8452_FREEFALL_CHANNEL(modifier) { \
1170 .type = IIO_ACCEL, \
1171 .modified = 1, \
1172 .channel2 = modifier, \
1173 .scan_index = -1, \
1174 .event_spec = mma8452_freefall_event, \
1175 .num_event_specs = ARRAY_SIZE(mma8452_freefall_event), \
1176 }
1177
1178 #define MMA8652_FREEFALL_CHANNEL(modifier) { \
1179 .type = IIO_ACCEL, \
1180 .modified = 1, \
1181 .channel2 = modifier, \
1182 .scan_index = -1, \
1183 .event_spec = mma8652_freefall_event, \
1184 .num_event_specs = ARRAY_SIZE(mma8652_freefall_event), \
1185 }
1186
1187 #define MMA8452_CHANNEL(axis, idx, bits) { \
1188 .type = IIO_ACCEL, \
1189 .modified = 1, \
1190 .channel2 = IIO_MOD_##axis, \
1191 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
1192 BIT(IIO_CHAN_INFO_CALIBBIAS), \
1193 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
1194 BIT(IIO_CHAN_INFO_SCALE) | \
1195 BIT(IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY) | \
1196 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
1197 .scan_index = idx, \
1198 .scan_type = { \
1199 .sign = 's', \
1200 .realbits = (bits), \
1201 .storagebits = 16, \
1202 .shift = 16 - (bits), \
1203 .endianness = IIO_BE, \
1204 }, \
1205 .event_spec = mma8452_transient_event, \
1206 .num_event_specs = ARRAY_SIZE(mma8452_transient_event), \
1207 }
1208
1209 #define MMA8652_CHANNEL(axis, idx, bits) { \
1210 .type = IIO_ACCEL, \
1211 .modified = 1, \
1212 .channel2 = IIO_MOD_##axis, \
1213 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
1214 BIT(IIO_CHAN_INFO_CALIBBIAS), \
1215 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
1216 BIT(IIO_CHAN_INFO_SCALE) | \
1217 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
1218 .scan_index = idx, \
1219 .scan_type = { \
1220 .sign = 's', \
1221 .realbits = (bits), \
1222 .storagebits = 16, \
1223 .shift = 16 - (bits), \
1224 .endianness = IIO_BE, \
1225 }, \
1226 .event_spec = mma8452_motion_event, \
1227 .num_event_specs = ARRAY_SIZE(mma8452_motion_event), \
1228 }
1229
1230 static const struct iio_chan_spec mma8451_channels[] = {
1231 MMA8452_CHANNEL(X, idx_x, 14),
1232 MMA8452_CHANNEL(Y, idx_y, 14),
1233 MMA8452_CHANNEL(Z, idx_z, 14),
1234 IIO_CHAN_SOFT_TIMESTAMP(idx_ts),
1235 MMA8452_FREEFALL_CHANNEL(IIO_MOD_X_AND_Y_AND_Z),
1236 };
1237
1238 static const struct iio_chan_spec mma8452_channels[] = {
1239 MMA8452_CHANNEL(X, idx_x, 12),
1240 MMA8452_CHANNEL(Y, idx_y, 12),
1241 MMA8452_CHANNEL(Z, idx_z, 12),
1242 IIO_CHAN_SOFT_TIMESTAMP(idx_ts),
1243 MMA8452_FREEFALL_CHANNEL(IIO_MOD_X_AND_Y_AND_Z),
1244 };
1245
1246 static const struct iio_chan_spec mma8453_channels[] = {
1247 MMA8452_CHANNEL(X, idx_x, 10),
1248 MMA8452_CHANNEL(Y, idx_y, 10),
1249 MMA8452_CHANNEL(Z, idx_z, 10),
1250 IIO_CHAN_SOFT_TIMESTAMP(idx_ts),
1251 MMA8452_FREEFALL_CHANNEL(IIO_MOD_X_AND_Y_AND_Z),
1252 };
1253
1254 static const struct iio_chan_spec mma8652_channels[] = {
1255 MMA8652_CHANNEL(X, idx_x, 12),
1256 MMA8652_CHANNEL(Y, idx_y, 12),
1257 MMA8652_CHANNEL(Z, idx_z, 12),
1258 IIO_CHAN_SOFT_TIMESTAMP(idx_ts),
1259 MMA8652_FREEFALL_CHANNEL(IIO_MOD_X_AND_Y_AND_Z),
1260 };
1261
1262 static const struct iio_chan_spec mma8653_channels[] = {
1263 MMA8652_CHANNEL(X, idx_x, 10),
1264 MMA8652_CHANNEL(Y, idx_y, 10),
1265 MMA8652_CHANNEL(Z, idx_z, 10),
1266 IIO_CHAN_SOFT_TIMESTAMP(idx_ts),
1267 MMA8652_FREEFALL_CHANNEL(IIO_MOD_X_AND_Y_AND_Z),
1268 };
1269
1270 enum {
1271 mma8451,
1272 mma8452,
1273 mma8453,
1274 mma8652,
1275 mma8653,
1276 fxls8471,
1277 };
1278
1279 static const struct mma_chip_info mma_chip_info_table[] = {
1280 [mma8451] = {
1281 .chip_id = MMA8451_DEVICE_ID,
1282 .channels = mma8451_channels,
1283 .num_channels = ARRAY_SIZE(mma8451_channels),
1284 /*
1285 * Hardware has fullscale of -2G, -4G, -8G corresponding to
1286 * raw value -8192 for 14 bit, -2048 for 12 bit or -512 for 10
1287 * bit.
1288 * The userspace interface uses m/s^2 and we declare micro units
1289 * So scale factor for 12 bit here is given by:
1290 * g * N * 1000000 / 2048 for N = 2, 4, 8 and g=9.80665
1291 */
1292 .mma_scales = { {0, 2394}, {0, 4788}, {0, 9577} },
1293 /*
1294 * Although we enable the interrupt sources once and for
1295 * all here the event detection itself is not enabled until
1296 * userspace asks for it by mma8452_write_event_config()
1297 */
1298 .all_events = MMA8452_INT_DRDY |
1299 MMA8452_INT_TRANS |
1300 MMA8452_INT_FF_MT,
1301 .enabled_events = MMA8452_INT_TRANS |
1302 MMA8452_INT_FF_MT,
1303 },
1304 [mma8452] = {
1305 .chip_id = MMA8452_DEVICE_ID,
1306 .channels = mma8452_channels,
1307 .num_channels = ARRAY_SIZE(mma8452_channels),
1308 .mma_scales = { {0, 9577}, {0, 19154}, {0, 38307} },
1309 /*
1310 * Although we enable the interrupt sources once and for
1311 * all here the event detection itself is not enabled until
1312 * userspace asks for it by mma8452_write_event_config()
1313 */
1314 .all_events = MMA8452_INT_DRDY |
1315 MMA8452_INT_TRANS |
1316 MMA8452_INT_FF_MT,
1317 .enabled_events = MMA8452_INT_TRANS |
1318 MMA8452_INT_FF_MT,
1319 },
1320 [mma8453] = {
1321 .chip_id = MMA8453_DEVICE_ID,
1322 .channels = mma8453_channels,
1323 .num_channels = ARRAY_SIZE(mma8453_channels),
1324 .mma_scales = { {0, 38307}, {0, 76614}, {0, 153228} },
1325 /*
1326 * Although we enable the interrupt sources once and for
1327 * all here the event detection itself is not enabled until
1328 * userspace asks for it by mma8452_write_event_config()
1329 */
1330 .all_events = MMA8452_INT_DRDY |
1331 MMA8452_INT_TRANS |
1332 MMA8452_INT_FF_MT,
1333 .enabled_events = MMA8452_INT_TRANS |
1334 MMA8452_INT_FF_MT,
1335 },
1336 [mma8652] = {
1337 .chip_id = MMA8652_DEVICE_ID,
1338 .channels = mma8652_channels,
1339 .num_channels = ARRAY_SIZE(mma8652_channels),
1340 .mma_scales = { {0, 9577}, {0, 19154}, {0, 38307} },
1341 .all_events = MMA8452_INT_DRDY |
1342 MMA8452_INT_FF_MT,
1343 .enabled_events = MMA8452_INT_FF_MT,
1344 },
1345 [mma8653] = {
1346 .chip_id = MMA8653_DEVICE_ID,
1347 .channels = mma8653_channels,
1348 .num_channels = ARRAY_SIZE(mma8653_channels),
1349 .mma_scales = { {0, 38307}, {0, 76614}, {0, 153228} },
1350 /*
1351 * Although we enable the interrupt sources once and for
1352 * all here the event detection itself is not enabled until
1353 * userspace asks for it by mma8452_write_event_config()
1354 */
1355 .all_events = MMA8452_INT_DRDY |
1356 MMA8452_INT_FF_MT,
1357 .enabled_events = MMA8452_INT_FF_MT,
1358 },
1359 [fxls8471] = {
1360 .chip_id = FXLS8471_DEVICE_ID,
1361 .channels = mma8451_channels,
1362 .num_channels = ARRAY_SIZE(mma8451_channels),
1363 .mma_scales = { {0, 2394}, {0, 4788}, {0, 9577} },
1364 /*
1365 * Although we enable the interrupt sources once and for
1366 * all here the event detection itself is not enabled until
1367 * userspace asks for it by mma8452_write_event_config()
1368 */
1369 .all_events = MMA8452_INT_DRDY |
1370 MMA8452_INT_TRANS |
1371 MMA8452_INT_FF_MT,
1372 .enabled_events = MMA8452_INT_TRANS |
1373 MMA8452_INT_FF_MT,
1374 },
1375 };
1376
1377 static struct attribute *mma8452_attributes[] = {
1378 &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
1379 &iio_dev_attr_in_accel_scale_available.dev_attr.attr,
1380 &iio_dev_attr_in_accel_filter_high_pass_3db_frequency_available.dev_attr.attr,
1381 &iio_dev_attr_in_accel_oversampling_ratio_available.dev_attr.attr,
1382 NULL
1383 };
1384
1385 static const struct attribute_group mma8452_group = {
1386 .attrs = mma8452_attributes,
1387 };
1388
1389 static const struct iio_info mma8452_info = {
1390 .attrs = &mma8452_group,
1391 .read_raw = &mma8452_read_raw,
1392 .write_raw = &mma8452_write_raw,
1393 .event_attrs = &mma8452_event_attribute_group,
1394 .read_event_value = &mma8452_read_event_value,
1395 .write_event_value = &mma8452_write_event_value,
1396 .read_event_config = &mma8452_read_event_config,
1397 .write_event_config = &mma8452_write_event_config,
1398 .debugfs_reg_access = &mma8452_reg_access_dbg,
1399 };
1400
1401 static const unsigned long mma8452_scan_masks[] = {0x7, 0};
1402
1403 static int mma8452_data_rdy_trigger_set_state(struct iio_trigger *trig,
1404 bool state)
1405 {
1406 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
1407 struct mma8452_data *data = iio_priv(indio_dev);
1408 int reg, ret;
1409
1410 ret = mma8452_set_runtime_pm_state(data->client, state);
1411 if (ret)
1412 return ret;
1413
1414 reg = i2c_smbus_read_byte_data(data->client, MMA8452_CTRL_REG4);
1415 if (reg < 0)
1416 return reg;
1417
1418 if (state)
1419 reg |= MMA8452_INT_DRDY;
1420 else
1421 reg &= ~MMA8452_INT_DRDY;
1422
1423 return mma8452_change_config(data, MMA8452_CTRL_REG4, reg);
1424 }
1425
1426 static const struct iio_trigger_ops mma8452_trigger_ops = {
1427 .set_trigger_state = mma8452_data_rdy_trigger_set_state,
1428 .validate_device = iio_trigger_validate_own_device,
1429 };
1430
1431 static int mma8452_trigger_setup(struct iio_dev *indio_dev)
1432 {
1433 struct mma8452_data *data = iio_priv(indio_dev);
1434 struct iio_trigger *trig;
1435 int ret;
1436
1437 trig = devm_iio_trigger_alloc(&data->client->dev, "%s-dev%d",
1438 indio_dev->name,
1439 indio_dev->id);
1440 if (!trig)
1441 return -ENOMEM;
1442
1443 trig->dev.parent = &data->client->dev;
1444 trig->ops = &mma8452_trigger_ops;
1445 iio_trigger_set_drvdata(trig, indio_dev);
1446
1447 ret = iio_trigger_register(trig);
1448 if (ret)
1449 return ret;
1450
1451 indio_dev->trig = trig;
1452
1453 return 0;
1454 }
1455
1456 static void mma8452_trigger_cleanup(struct iio_dev *indio_dev)
1457 {
1458 if (indio_dev->trig)
1459 iio_trigger_unregister(indio_dev->trig);
1460 }
1461
1462 static int mma8452_reset(struct i2c_client *client)
1463 {
1464 int i;
1465 int ret;
1466
1467 ret = i2c_smbus_write_byte_data(client, MMA8452_CTRL_REG2,
1468 MMA8452_CTRL_REG2_RST);
1469 if (ret < 0)
1470 return ret;
1471
1472 for (i = 0; i < 10; i++) {
1473 usleep_range(100, 200);
1474 ret = i2c_smbus_read_byte_data(client, MMA8452_CTRL_REG2);
1475 if (ret == -EIO)
1476 continue; /* I2C comm reset */
1477 if (ret < 0)
1478 return ret;
1479 if (!(ret & MMA8452_CTRL_REG2_RST))
1480 return 0;
1481 }
1482
1483 return -ETIMEDOUT;
1484 }
1485
1486 static const struct of_device_id mma8452_dt_ids[] = {
1487 { .compatible = "fsl,mma8451", .data = &mma_chip_info_table[mma8451] },
1488 { .compatible = "fsl,mma8452", .data = &mma_chip_info_table[mma8452] },
1489 { .compatible = "fsl,mma8453", .data = &mma_chip_info_table[mma8453] },
1490 { .compatible = "fsl,mma8652", .data = &mma_chip_info_table[mma8652] },
1491 { .compatible = "fsl,mma8653", .data = &mma_chip_info_table[mma8653] },
1492 { .compatible = "fsl,fxls8471", .data = &mma_chip_info_table[fxls8471] },
1493 { }
1494 };
1495 MODULE_DEVICE_TABLE(of, mma8452_dt_ids);
1496
1497 static int mma8452_probe(struct i2c_client *client,
1498 const struct i2c_device_id *id)
1499 {
1500 struct mma8452_data *data;
1501 struct iio_dev *indio_dev;
1502 int ret;
1503 const struct of_device_id *match;
1504
1505 match = of_match_device(mma8452_dt_ids, &client->dev);
1506 if (!match) {
1507 dev_err(&client->dev, "unknown device model\n");
1508 return -ENODEV;
1509 }
1510
1511 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
1512 if (!indio_dev)
1513 return -ENOMEM;
1514
1515 data = iio_priv(indio_dev);
1516 data->client = client;
1517 mutex_init(&data->lock);
1518 data->chip_info = match->data;
1519
1520 ret = i2c_smbus_read_byte_data(client, MMA8452_WHO_AM_I);
1521 if (ret < 0)
1522 return ret;
1523
1524 switch (ret) {
1525 case MMA8451_DEVICE_ID:
1526 case MMA8452_DEVICE_ID:
1527 case MMA8453_DEVICE_ID:
1528 case MMA8652_DEVICE_ID:
1529 case MMA8653_DEVICE_ID:
1530 case FXLS8471_DEVICE_ID:
1531 if (ret == data->chip_info->chip_id)
1532 break;
1533 default:
1534 return -ENODEV;
1535 }
1536
1537 dev_info(&client->dev, "registering %s accelerometer; ID 0x%x\n",
1538 match->compatible, data->chip_info->chip_id);
1539
1540 i2c_set_clientdata(client, indio_dev);
1541 indio_dev->info = &mma8452_info;
1542 indio_dev->name = id->name;
1543 indio_dev->dev.parent = &client->dev;
1544 indio_dev->modes = INDIO_DIRECT_MODE;
1545 indio_dev->channels = data->chip_info->channels;
1546 indio_dev->num_channels = data->chip_info->num_channels;
1547 indio_dev->available_scan_masks = mma8452_scan_masks;
1548
1549 ret = mma8452_reset(client);
1550 if (ret < 0)
1551 return ret;
1552
1553 data->data_cfg = MMA8452_DATA_CFG_FS_2G;
1554 ret = i2c_smbus_write_byte_data(client, MMA8452_DATA_CFG,
1555 data->data_cfg);
1556 if (ret < 0)
1557 return ret;
1558
1559 /*
1560 * By default set transient threshold to max to avoid events if
1561 * enabling without configuring threshold.
1562 */
1563 ret = i2c_smbus_write_byte_data(client, MMA8452_TRANSIENT_THS,
1564 MMA8452_TRANSIENT_THS_MASK);
1565 if (ret < 0)
1566 return ret;
1567
1568 if (client->irq) {
1569 int irq2;
1570
1571 irq2 = of_irq_get_byname(client->dev.of_node, "INT2");
1572
1573 if (irq2 == client->irq) {
1574 dev_dbg(&client->dev, "using interrupt line INT2\n");
1575 } else {
1576 ret = i2c_smbus_write_byte_data(client,
1577 MMA8452_CTRL_REG5,
1578 data->chip_info->all_events);
1579 if (ret < 0)
1580 return ret;
1581
1582 dev_dbg(&client->dev, "using interrupt line INT1\n");
1583 }
1584
1585 ret = i2c_smbus_write_byte_data(client,
1586 MMA8452_CTRL_REG4,
1587 data->chip_info->enabled_events);
1588 if (ret < 0)
1589 return ret;
1590
1591 ret = mma8452_trigger_setup(indio_dev);
1592 if (ret < 0)
1593 return ret;
1594 }
1595
1596 data->ctrl_reg1 = MMA8452_CTRL_ACTIVE |
1597 (MMA8452_CTRL_DR_DEFAULT << MMA8452_CTRL_DR_SHIFT);
1598 ret = i2c_smbus_write_byte_data(client, MMA8452_CTRL_REG1,
1599 data->ctrl_reg1);
1600 if (ret < 0)
1601 goto trigger_cleanup;
1602
1603 ret = iio_triggered_buffer_setup(indio_dev, NULL,
1604 mma8452_trigger_handler, NULL);
1605 if (ret < 0)
1606 goto trigger_cleanup;
1607
1608 if (client->irq) {
1609 ret = devm_request_threaded_irq(&client->dev,
1610 client->irq,
1611 NULL, mma8452_interrupt,
1612 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
1613 client->name, indio_dev);
1614 if (ret)
1615 goto buffer_cleanup;
1616 }
1617
1618 ret = pm_runtime_set_active(&client->dev);
1619 if (ret < 0)
1620 goto buffer_cleanup;
1621
1622 pm_runtime_enable(&client->dev);
1623 pm_runtime_set_autosuspend_delay(&client->dev,
1624 MMA8452_AUTO_SUSPEND_DELAY_MS);
1625 pm_runtime_use_autosuspend(&client->dev);
1626
1627 ret = iio_device_register(indio_dev);
1628 if (ret < 0)
1629 goto buffer_cleanup;
1630
1631 ret = mma8452_set_freefall_mode(data, false);
1632 if (ret < 0)
1633 goto buffer_cleanup;
1634
1635 return 0;
1636
1637 buffer_cleanup:
1638 iio_triggered_buffer_cleanup(indio_dev);
1639
1640 trigger_cleanup:
1641 mma8452_trigger_cleanup(indio_dev);
1642
1643 return ret;
1644 }
1645
1646 static int mma8452_remove(struct i2c_client *client)
1647 {
1648 struct iio_dev *indio_dev = i2c_get_clientdata(client);
1649
1650 iio_device_unregister(indio_dev);
1651
1652 pm_runtime_disable(&client->dev);
1653 pm_runtime_set_suspended(&client->dev);
1654 pm_runtime_put_noidle(&client->dev);
1655
1656 iio_triggered_buffer_cleanup(indio_dev);
1657 mma8452_trigger_cleanup(indio_dev);
1658 mma8452_standby(iio_priv(indio_dev));
1659
1660 return 0;
1661 }
1662
1663 #ifdef CONFIG_PM
1664 static int mma8452_runtime_suspend(struct device *dev)
1665 {
1666 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1667 struct mma8452_data *data = iio_priv(indio_dev);
1668 int ret;
1669
1670 mutex_lock(&data->lock);
1671 ret = mma8452_standby(data);
1672 mutex_unlock(&data->lock);
1673 if (ret < 0) {
1674 dev_err(&data->client->dev, "powering off device failed\n");
1675 return -EAGAIN;
1676 }
1677
1678 return 0;
1679 }
1680
1681 static int mma8452_runtime_resume(struct device *dev)
1682 {
1683 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1684 struct mma8452_data *data = iio_priv(indio_dev);
1685 int ret, sleep_val;
1686
1687 ret = mma8452_active(data);
1688 if (ret < 0)
1689 return ret;
1690
1691 ret = mma8452_get_odr_index(data);
1692 sleep_val = 1000 / mma8452_samp_freq[ret][0];
1693 if (sleep_val < 20)
1694 usleep_range(sleep_val * 1000, 20000);
1695 else
1696 msleep_interruptible(sleep_val);
1697
1698 return 0;
1699 }
1700 #endif
1701
1702 #ifdef CONFIG_PM_SLEEP
1703 static int mma8452_suspend(struct device *dev)
1704 {
1705 return mma8452_standby(iio_priv(i2c_get_clientdata(
1706 to_i2c_client(dev))));
1707 }
1708
1709 static int mma8452_resume(struct device *dev)
1710 {
1711 return mma8452_active(iio_priv(i2c_get_clientdata(
1712 to_i2c_client(dev))));
1713 }
1714 #endif
1715
1716 static const struct dev_pm_ops mma8452_pm_ops = {
1717 SET_SYSTEM_SLEEP_PM_OPS(mma8452_suspend, mma8452_resume)
1718 SET_RUNTIME_PM_OPS(mma8452_runtime_suspend,
1719 mma8452_runtime_resume, NULL)
1720 };
1721
1722 static const struct i2c_device_id mma8452_id[] = {
1723 { "mma8451", mma8451 },
1724 { "mma8452", mma8452 },
1725 { "mma8453", mma8453 },
1726 { "mma8652", mma8652 },
1727 { "mma8653", mma8653 },
1728 { "fxls8471", fxls8471 },
1729 { }
1730 };
1731 MODULE_DEVICE_TABLE(i2c, mma8452_id);
1732
1733 static struct i2c_driver mma8452_driver = {
1734 .driver = {
1735 .name = "mma8452",
1736 .of_match_table = of_match_ptr(mma8452_dt_ids),
1737 .pm = &mma8452_pm_ops,
1738 },
1739 .probe = mma8452_probe,
1740 .remove = mma8452_remove,
1741 .id_table = mma8452_id,
1742 };
1743 module_i2c_driver(mma8452_driver);
1744
1745 MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
1746 MODULE_DESCRIPTION("Freescale / NXP MMA8452 accelerometer driver");
1747 MODULE_LICENSE("GPL");
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