1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * STMicroelectronics sensors core library driver
4 *
5 * Copyright 2012-2013 STMicroelectronics Inc.
6 *
7 * Denis Ciocca <denis.ciocca@st.com>
8 */
9
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/slab.h>
13 #include <linux/delay.h>
14 #include <linux/iio/iio.h>
15 #include <linux/mutex.h>
16 #include <linux/property.h>
17 #include <linux/regulator/consumer.h>
18 #include <linux/regmap.h>
19 #include <linux/unaligned.h>
20 #include <linux/iio/common/st_sensors.h>
21
22 #include "st_sensors_core.h"
23
st_sensors_write_data_with_mask(struct iio_dev * indio_dev,u8 reg_addr,u8 mask,u8 data)24 int st_sensors_write_data_with_mask(struct iio_dev *indio_dev,
25 u8 reg_addr, u8 mask, u8 data)
26 {
27 struct st_sensor_data *sdata = iio_priv(indio_dev);
28
29 return regmap_update_bits(sdata->regmap,
30 reg_addr, mask, data << __ffs(mask));
31 }
32
st_sensors_debugfs_reg_access(struct iio_dev * indio_dev,unsigned reg,unsigned writeval,unsigned * readval)33 int st_sensors_debugfs_reg_access(struct iio_dev *indio_dev,
34 unsigned reg, unsigned writeval,
35 unsigned *readval)
36 {
37 struct st_sensor_data *sdata = iio_priv(indio_dev);
38 int err;
39
40 if (!readval)
41 return regmap_write(sdata->regmap, reg, writeval);
42
43 err = regmap_read(sdata->regmap, reg, readval);
44 if (err < 0)
45 return err;
46
47 return 0;
48 }
49 EXPORT_SYMBOL_NS(st_sensors_debugfs_reg_access, "IIO_ST_SENSORS");
50
st_sensors_match_odr(struct st_sensor_settings * sensor_settings,unsigned int odr,struct st_sensor_odr_avl * odr_out)51 static int st_sensors_match_odr(struct st_sensor_settings *sensor_settings,
52 unsigned int odr, struct st_sensor_odr_avl *odr_out)
53 {
54 int i, ret = -EINVAL;
55
56 for (i = 0; i < ST_SENSORS_ODR_LIST_MAX; i++) {
57 if (sensor_settings->odr.odr_avl[i].hz == 0)
58 goto st_sensors_match_odr_error;
59
60 if (sensor_settings->odr.odr_avl[i].hz == odr) {
61 odr_out->hz = sensor_settings->odr.odr_avl[i].hz;
62 odr_out->value = sensor_settings->odr.odr_avl[i].value;
63 ret = 0;
64 break;
65 }
66 }
67
68 st_sensors_match_odr_error:
69 return ret;
70 }
71
st_sensors_set_odr(struct iio_dev * indio_dev,unsigned int odr)72 int st_sensors_set_odr(struct iio_dev *indio_dev, unsigned int odr)
73 {
74 int err = 0;
75 struct st_sensor_odr_avl odr_out = {0, 0};
76 struct st_sensor_data *sdata = iio_priv(indio_dev);
77
78 mutex_lock(&sdata->odr_lock);
79
80 if (!sdata->sensor_settings->odr.mask)
81 goto unlock_mutex;
82
83 err = st_sensors_match_odr(sdata->sensor_settings, odr, &odr_out);
84 if (err < 0)
85 goto unlock_mutex;
86
87 if ((sdata->sensor_settings->odr.addr ==
88 sdata->sensor_settings->pw.addr) &&
89 (sdata->sensor_settings->odr.mask ==
90 sdata->sensor_settings->pw.mask)) {
91 if (sdata->enabled == true) {
92 err = st_sensors_write_data_with_mask(indio_dev,
93 sdata->sensor_settings->odr.addr,
94 sdata->sensor_settings->odr.mask,
95 odr_out.value);
96 } else {
97 err = 0;
98 }
99 } else {
100 err = st_sensors_write_data_with_mask(indio_dev,
101 sdata->sensor_settings->odr.addr,
102 sdata->sensor_settings->odr.mask,
103 odr_out.value);
104 }
105 if (err >= 0)
106 sdata->odr = odr_out.hz;
107
108 unlock_mutex:
109 mutex_unlock(&sdata->odr_lock);
110
111 return err;
112 }
113 EXPORT_SYMBOL_NS(st_sensors_set_odr, "IIO_ST_SENSORS");
114
st_sensors_match_fs(struct st_sensor_settings * sensor_settings,unsigned int fs,int * index_fs_avl)115 static int st_sensors_match_fs(struct st_sensor_settings *sensor_settings,
116 unsigned int fs, int *index_fs_avl)
117 {
118 int i, ret = -EINVAL;
119
120 for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
121 if (sensor_settings->fs.fs_avl[i].num == 0)
122 return ret;
123
124 if (sensor_settings->fs.fs_avl[i].num == fs) {
125 *index_fs_avl = i;
126 ret = 0;
127 break;
128 }
129 }
130
131 return ret;
132 }
133
st_sensors_set_fullscale(struct iio_dev * indio_dev,unsigned int fs)134 static int st_sensors_set_fullscale(struct iio_dev *indio_dev, unsigned int fs)
135 {
136 int err, i = 0;
137 struct st_sensor_data *sdata = iio_priv(indio_dev);
138
139 if (sdata->sensor_settings->fs.addr == 0)
140 return 0;
141
142 err = st_sensors_match_fs(sdata->sensor_settings, fs, &i);
143 if (err < 0)
144 goto st_accel_set_fullscale_error;
145
146 err = st_sensors_write_data_with_mask(indio_dev,
147 sdata->sensor_settings->fs.addr,
148 sdata->sensor_settings->fs.mask,
149 sdata->sensor_settings->fs.fs_avl[i].value);
150 if (err < 0)
151 goto st_accel_set_fullscale_error;
152
153 sdata->current_fullscale = &sdata->sensor_settings->fs.fs_avl[i];
154 return err;
155
156 st_accel_set_fullscale_error:
157 dev_err(&indio_dev->dev, "failed to set new fullscale.\n");
158 return err;
159 }
160
st_sensors_set_enable(struct iio_dev * indio_dev,bool enable)161 int st_sensors_set_enable(struct iio_dev *indio_dev, bool enable)
162 {
163 u8 tmp_value;
164 int err = -EINVAL;
165 bool found = false;
166 struct st_sensor_odr_avl odr_out = {0, 0};
167 struct st_sensor_data *sdata = iio_priv(indio_dev);
168
169 if (enable) {
170 tmp_value = sdata->sensor_settings->pw.value_on;
171 if ((sdata->sensor_settings->odr.addr ==
172 sdata->sensor_settings->pw.addr) &&
173 (sdata->sensor_settings->odr.mask ==
174 sdata->sensor_settings->pw.mask)) {
175 err = st_sensors_match_odr(sdata->sensor_settings,
176 sdata->odr, &odr_out);
177 if (err < 0)
178 goto set_enable_error;
179 tmp_value = odr_out.value;
180 found = true;
181 }
182 err = st_sensors_write_data_with_mask(indio_dev,
183 sdata->sensor_settings->pw.addr,
184 sdata->sensor_settings->pw.mask, tmp_value);
185 if (err < 0)
186 goto set_enable_error;
187
188 sdata->enabled = true;
189
190 if (found)
191 sdata->odr = odr_out.hz;
192 } else {
193 err = st_sensors_write_data_with_mask(indio_dev,
194 sdata->sensor_settings->pw.addr,
195 sdata->sensor_settings->pw.mask,
196 sdata->sensor_settings->pw.value_off);
197 if (err < 0)
198 goto set_enable_error;
199
200 sdata->enabled = false;
201 }
202
203 set_enable_error:
204 return err;
205 }
206 EXPORT_SYMBOL_NS(st_sensors_set_enable, "IIO_ST_SENSORS");
207
st_sensors_set_axis_enable(struct iio_dev * indio_dev,u8 axis_enable)208 int st_sensors_set_axis_enable(struct iio_dev *indio_dev, u8 axis_enable)
209 {
210 struct st_sensor_data *sdata = iio_priv(indio_dev);
211 int err = 0;
212
213 if (sdata->sensor_settings->enable_axis.addr)
214 err = st_sensors_write_data_with_mask(indio_dev,
215 sdata->sensor_settings->enable_axis.addr,
216 sdata->sensor_settings->enable_axis.mask,
217 axis_enable);
218 return err;
219 }
220 EXPORT_SYMBOL_NS(st_sensors_set_axis_enable, "IIO_ST_SENSORS");
221
222
st_sensors_power_enable(struct iio_dev * indio_dev)223 int st_sensors_power_enable(struct iio_dev *indio_dev)
224 {
225 static const char * const regulator_names[] = { "vdd", "vddio" };
226 struct device *parent = indio_dev->dev.parent;
227 int err;
228
229 /* Regulators not mandatory, but if requested we should enable them. */
230 err = devm_regulator_bulk_get_enable(parent,
231 ARRAY_SIZE(regulator_names),
232 regulator_names);
233 if (err)
234 return dev_err_probe(&indio_dev->dev, err,
235 "unable to enable supplies\n");
236
237 return 0;
238 }
239 EXPORT_SYMBOL_NS(st_sensors_power_enable, "IIO_ST_SENSORS");
240
st_sensors_set_drdy_int_pin(struct iio_dev * indio_dev,struct st_sensors_platform_data * pdata)241 static int st_sensors_set_drdy_int_pin(struct iio_dev *indio_dev,
242 struct st_sensors_platform_data *pdata)
243 {
244 struct st_sensor_data *sdata = iio_priv(indio_dev);
245
246 /* Sensor does not support interrupts */
247 if (!sdata->sensor_settings->drdy_irq.int1.addr &&
248 !sdata->sensor_settings->drdy_irq.int2.addr) {
249 if (pdata->drdy_int_pin)
250 dev_info(&indio_dev->dev,
251 "DRDY on pin INT%d specified, but sensor does not support interrupts\n",
252 pdata->drdy_int_pin);
253 return 0;
254 }
255
256 switch (pdata->drdy_int_pin) {
257 case 1:
258 if (!sdata->sensor_settings->drdy_irq.int1.mask) {
259 dev_err(&indio_dev->dev,
260 "DRDY on INT1 not available.\n");
261 return -EINVAL;
262 }
263 sdata->drdy_int_pin = 1;
264 break;
265 case 2:
266 if (!sdata->sensor_settings->drdy_irq.int2.mask) {
267 dev_err(&indio_dev->dev,
268 "DRDY on INT2 not available.\n");
269 return -EINVAL;
270 }
271 sdata->drdy_int_pin = 2;
272 break;
273 default:
274 dev_err(&indio_dev->dev, "DRDY on pdata not valid.\n");
275 return -EINVAL;
276 }
277
278 if (pdata->open_drain) {
279 if (!sdata->sensor_settings->drdy_irq.int1.addr_od &&
280 !sdata->sensor_settings->drdy_irq.int2.addr_od)
281 dev_err(&indio_dev->dev,
282 "open drain requested but unsupported.\n");
283 else
284 sdata->int_pin_open_drain = true;
285 }
286
287 return 0;
288 }
289
st_sensors_dev_probe(struct device * dev,struct st_sensors_platform_data * defdata)290 static struct st_sensors_platform_data *st_sensors_dev_probe(struct device *dev,
291 struct st_sensors_platform_data *defdata)
292 {
293 struct st_sensors_platform_data *pdata;
294 u32 val;
295
296 if (!dev_fwnode(dev))
297 return NULL;
298
299 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
300 if (!pdata)
301 return ERR_PTR(-ENOMEM);
302 if (!device_property_read_u32(dev, "st,drdy-int-pin", &val) && (val <= 2))
303 pdata->drdy_int_pin = (u8) val;
304 else
305 pdata->drdy_int_pin = defdata ? defdata->drdy_int_pin : 0;
306
307 pdata->open_drain = device_property_read_bool(dev, "drive-open-drain");
308
309 return pdata;
310 }
311
312 /**
313 * st_sensors_dev_name_probe() - device probe for ST sensor name
314 * @dev: driver model representation of the device.
315 * @name: device name buffer reference.
316 * @len: device name buffer length.
317 *
318 * In effect this function matches an ID to an internal kernel
319 * name for a certain sensor device, so that the rest of the autodetection can
320 * rely on that name from this point on. I2C/SPI devices will be renamed
321 * to match the internal kernel convention.
322 */
st_sensors_dev_name_probe(struct device * dev,char * name,int len)323 void st_sensors_dev_name_probe(struct device *dev, char *name, int len)
324 {
325 const void *match;
326
327 match = device_get_match_data(dev);
328 if (!match)
329 return;
330
331 /* The name from the match takes precedence if present */
332 strscpy(name, match, len);
333 }
334 EXPORT_SYMBOL_NS(st_sensors_dev_name_probe, "IIO_ST_SENSORS");
335
st_sensors_init_sensor(struct iio_dev * indio_dev,struct st_sensors_platform_data * pdata)336 int st_sensors_init_sensor(struct iio_dev *indio_dev,
337 struct st_sensors_platform_data *pdata)
338 {
339 struct st_sensor_data *sdata = iio_priv(indio_dev);
340 struct st_sensors_platform_data *of_pdata;
341 int err = 0;
342
343 mutex_init(&sdata->odr_lock);
344
345 /* If OF/DT pdata exists, it will take precedence of anything else */
346 of_pdata = st_sensors_dev_probe(indio_dev->dev.parent, pdata);
347 if (IS_ERR(of_pdata))
348 return PTR_ERR(of_pdata);
349 if (of_pdata)
350 pdata = of_pdata;
351
352 if (pdata) {
353 err = st_sensors_set_drdy_int_pin(indio_dev, pdata);
354 if (err < 0)
355 return err;
356 }
357
358 err = st_sensors_set_enable(indio_dev, false);
359 if (err < 0)
360 return err;
361
362 /* Disable DRDY, this might be still be enabled after reboot. */
363 err = st_sensors_set_dataready_irq(indio_dev, false);
364 if (err < 0)
365 return err;
366
367 if (sdata->current_fullscale) {
368 err = st_sensors_set_fullscale(indio_dev,
369 sdata->current_fullscale->num);
370 if (err < 0)
371 return err;
372 } else
373 dev_info(&indio_dev->dev, "Full-scale not possible\n");
374
375 err = st_sensors_set_odr(indio_dev, sdata->odr);
376 if (err < 0)
377 return err;
378
379 /* set BDU */
380 if (sdata->sensor_settings->bdu.addr) {
381 err = st_sensors_write_data_with_mask(indio_dev,
382 sdata->sensor_settings->bdu.addr,
383 sdata->sensor_settings->bdu.mask, true);
384 if (err < 0)
385 return err;
386 }
387
388 /* set DAS */
389 if (sdata->sensor_settings->das.addr) {
390 err = st_sensors_write_data_with_mask(indio_dev,
391 sdata->sensor_settings->das.addr,
392 sdata->sensor_settings->das.mask, 1);
393 if (err < 0)
394 return err;
395 }
396
397 if (sdata->int_pin_open_drain) {
398 u8 addr, mask;
399
400 if (sdata->drdy_int_pin == 1) {
401 addr = sdata->sensor_settings->drdy_irq.int1.addr_od;
402 mask = sdata->sensor_settings->drdy_irq.int1.mask_od;
403 } else {
404 addr = sdata->sensor_settings->drdy_irq.int2.addr_od;
405 mask = sdata->sensor_settings->drdy_irq.int2.mask_od;
406 }
407
408 dev_info(&indio_dev->dev,
409 "set interrupt line to open drain mode on pin %d\n",
410 sdata->drdy_int_pin);
411 err = st_sensors_write_data_with_mask(indio_dev, addr,
412 mask, 1);
413 if (err < 0)
414 return err;
415 }
416
417 err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
418
419 return err;
420 }
421 EXPORT_SYMBOL_NS(st_sensors_init_sensor, "IIO_ST_SENSORS");
422
st_sensors_set_dataready_irq(struct iio_dev * indio_dev,bool enable)423 int st_sensors_set_dataready_irq(struct iio_dev *indio_dev, bool enable)
424 {
425 int err;
426 u8 drdy_addr, drdy_mask;
427 struct st_sensor_data *sdata = iio_priv(indio_dev);
428
429 if (!sdata->sensor_settings->drdy_irq.int1.addr &&
430 !sdata->sensor_settings->drdy_irq.int2.addr) {
431 /*
432 * there are some devices (e.g. LIS3MDL) where drdy line is
433 * routed to a given pin and it is not possible to select a
434 * different one. Take into account irq status register
435 * to understand if irq trigger can be properly supported
436 */
437 if (sdata->sensor_settings->drdy_irq.stat_drdy.addr)
438 sdata->hw_irq_trigger = enable;
439 return 0;
440 }
441
442 /* Enable/Disable the interrupt generator 1. */
443 if (sdata->sensor_settings->drdy_irq.ig1.en_addr > 0) {
444 err = st_sensors_write_data_with_mask(indio_dev,
445 sdata->sensor_settings->drdy_irq.ig1.en_addr,
446 sdata->sensor_settings->drdy_irq.ig1.en_mask,
447 (int)enable);
448 if (err < 0)
449 goto st_accel_set_dataready_irq_error;
450 }
451
452 if (sdata->drdy_int_pin == 1) {
453 drdy_addr = sdata->sensor_settings->drdy_irq.int1.addr;
454 drdy_mask = sdata->sensor_settings->drdy_irq.int1.mask;
455 } else {
456 drdy_addr = sdata->sensor_settings->drdy_irq.int2.addr;
457 drdy_mask = sdata->sensor_settings->drdy_irq.int2.mask;
458 }
459
460 /* Flag to the poll function that the hardware trigger is in use */
461 sdata->hw_irq_trigger = enable;
462
463 /* Enable/Disable the interrupt generator for data ready. */
464 err = st_sensors_write_data_with_mask(indio_dev, drdy_addr,
465 drdy_mask, (int)enable);
466
467 st_accel_set_dataready_irq_error:
468 return err;
469 }
470 EXPORT_SYMBOL_NS(st_sensors_set_dataready_irq, "IIO_ST_SENSORS");
471
st_sensors_set_fullscale_by_gain(struct iio_dev * indio_dev,int scale)472 int st_sensors_set_fullscale_by_gain(struct iio_dev *indio_dev, int scale)
473 {
474 int err = -EINVAL, i;
475 struct st_sensor_data *sdata = iio_priv(indio_dev);
476
477 for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
478 if ((sdata->sensor_settings->fs.fs_avl[i].gain == scale) &&
479 (sdata->sensor_settings->fs.fs_avl[i].gain != 0)) {
480 err = 0;
481 break;
482 }
483 }
484 if (err < 0)
485 goto st_sensors_match_scale_error;
486
487 err = st_sensors_set_fullscale(indio_dev,
488 sdata->sensor_settings->fs.fs_avl[i].num);
489
490 st_sensors_match_scale_error:
491 return err;
492 }
493 EXPORT_SYMBOL_NS(st_sensors_set_fullscale_by_gain, "IIO_ST_SENSORS");
494
st_sensors_read_axis_data(struct iio_dev * indio_dev,struct iio_chan_spec const * ch,int * data)495 static int st_sensors_read_axis_data(struct iio_dev *indio_dev,
496 struct iio_chan_spec const *ch, int *data)
497 {
498 int err;
499 u8 *outdata;
500 struct st_sensor_data *sdata = iio_priv(indio_dev);
501 unsigned int byte_for_channel;
502
503 byte_for_channel = DIV_ROUND_UP(ch->scan_type.realbits +
504 ch->scan_type.shift, 8);
505 outdata = kmalloc(byte_for_channel, GFP_DMA | GFP_KERNEL);
506 if (!outdata)
507 return -ENOMEM;
508
509 err = regmap_bulk_read(sdata->regmap, ch->address,
510 outdata, byte_for_channel);
511 if (err < 0)
512 goto st_sensors_free_memory;
513
514 if (byte_for_channel == 1)
515 *data = (s8)*outdata;
516 else if (byte_for_channel == 2)
517 *data = (s16)get_unaligned_le16(outdata);
518 else if (byte_for_channel == 3)
519 *data = (s32)sign_extend32(get_unaligned_le24(outdata), 23);
520
521 st_sensors_free_memory:
522 kfree(outdata);
523
524 return err;
525 }
526
st_sensors_read_info_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * ch,int * val)527 int st_sensors_read_info_raw(struct iio_dev *indio_dev,
528 struct iio_chan_spec const *ch, int *val)
529 {
530 int err;
531 struct st_sensor_data *sdata = iio_priv(indio_dev);
532
533 err = iio_device_claim_direct_mode(indio_dev);
534 if (err)
535 return err;
536
537 mutex_lock(&sdata->odr_lock);
538
539 err = st_sensors_set_enable(indio_dev, true);
540 if (err < 0)
541 goto out;
542
543 msleep((sdata->sensor_settings->bootime * 1000) / sdata->odr);
544 err = st_sensors_read_axis_data(indio_dev, ch, val);
545 if (err < 0)
546 goto out;
547
548 *val = *val >> ch->scan_type.shift;
549
550 err = st_sensors_set_enable(indio_dev, false);
551
552 out:
553 mutex_unlock(&sdata->odr_lock);
554 iio_device_release_direct_mode(indio_dev);
555
556 return err;
557 }
558 EXPORT_SYMBOL_NS(st_sensors_read_info_raw, "IIO_ST_SENSORS");
559
560 /*
561 * st_sensors_get_settings_index() - get index of the sensor settings for a
562 * specific device from list of settings
563 * @name: device name buffer reference.
564 * @list: sensor settings list.
565 * @list_length: length of sensor settings list.
566 *
567 * Return: non negative number on success (valid index),
568 * negative error code otherwise.
569 */
st_sensors_get_settings_index(const char * name,const struct st_sensor_settings * list,const int list_length)570 int st_sensors_get_settings_index(const char *name,
571 const struct st_sensor_settings *list,
572 const int list_length)
573 {
574 int i, n;
575
576 for (i = 0; i < list_length; i++) {
577 for (n = 0; n < ST_SENSORS_MAX_4WAI; n++) {
578 if (strcmp(name, list[i].sensors_supported[n]) == 0)
579 return i;
580 }
581 }
582
583 return -ENODEV;
584 }
585 EXPORT_SYMBOL_NS(st_sensors_get_settings_index, "IIO_ST_SENSORS");
586
587 /*
588 * st_sensors_verify_id() - verify sensor ID (WhoAmI) is matching with the
589 * expected value
590 * @indio_dev: IIO device reference.
591 *
592 * Return: 0 on success (valid sensor ID), else a negative error code.
593 */
st_sensors_verify_id(struct iio_dev * indio_dev)594 int st_sensors_verify_id(struct iio_dev *indio_dev)
595 {
596 struct st_sensor_data *sdata = iio_priv(indio_dev);
597 int wai, err;
598
599 if (sdata->sensor_settings->wai_addr) {
600 err = regmap_read(sdata->regmap,
601 sdata->sensor_settings->wai_addr, &wai);
602 if (err < 0) {
603 dev_err(&indio_dev->dev,
604 "failed to read Who-Am-I register.\n");
605 return err;
606 }
607
608 if (sdata->sensor_settings->wai != wai) {
609 dev_warn(&indio_dev->dev,
610 "%s: WhoAmI mismatch (0x%x).\n",
611 indio_dev->name, wai);
612 }
613 }
614
615 return 0;
616 }
617 EXPORT_SYMBOL_NS(st_sensors_verify_id, "IIO_ST_SENSORS");
618
st_sensors_sysfs_sampling_frequency_avail(struct device * dev,struct device_attribute * attr,char * buf)619 ssize_t st_sensors_sysfs_sampling_frequency_avail(struct device *dev,
620 struct device_attribute *attr, char *buf)
621 {
622 int i, len = 0;
623 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
624 struct st_sensor_data *sdata = iio_priv(indio_dev);
625
626 for (i = 0; i < ST_SENSORS_ODR_LIST_MAX; i++) {
627 if (sdata->sensor_settings->odr.odr_avl[i].hz == 0)
628 break;
629
630 len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
631 sdata->sensor_settings->odr.odr_avl[i].hz);
632 }
633 buf[len - 1] = '\n';
634
635 return len;
636 }
637 EXPORT_SYMBOL_NS(st_sensors_sysfs_sampling_frequency_avail, "IIO_ST_SENSORS");
638
st_sensors_sysfs_scale_avail(struct device * dev,struct device_attribute * attr,char * buf)639 ssize_t st_sensors_sysfs_scale_avail(struct device *dev,
640 struct device_attribute *attr, char *buf)
641 {
642 int i, len = 0, q, r;
643 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
644 struct st_sensor_data *sdata = iio_priv(indio_dev);
645
646 for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
647 if (sdata->sensor_settings->fs.fs_avl[i].num == 0)
648 break;
649
650 q = sdata->sensor_settings->fs.fs_avl[i].gain / 1000000;
651 r = sdata->sensor_settings->fs.fs_avl[i].gain % 1000000;
652
653 len += scnprintf(buf + len, PAGE_SIZE - len, "%u.%06u ", q, r);
654 }
655 buf[len - 1] = '\n';
656
657 return len;
658 }
659 EXPORT_SYMBOL_NS(st_sensors_sysfs_scale_avail, "IIO_ST_SENSORS");
660
661 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
662 MODULE_DESCRIPTION("STMicroelectronics ST-sensors core");
663 MODULE_LICENSE("GPL v2");
664