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.parent, "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(parent, err, "unable to enable supplies\n");
235
236 return 0;
237 }
238 EXPORT_SYMBOL_NS(st_sensors_power_enable, "IIO_ST_SENSORS");
239
st_sensors_set_drdy_int_pin(struct iio_dev * indio_dev,struct st_sensors_platform_data * pdata)240 static int st_sensors_set_drdy_int_pin(struct iio_dev *indio_dev,
241 struct st_sensors_platform_data *pdata)
242 {
243 struct device *parent = indio_dev->dev.parent;
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(parent,
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(parent, "DRDY on INT1 not available.\n");
260 return -EINVAL;
261 }
262 sdata->drdy_int_pin = 1;
263 break;
264 case 2:
265 if (!sdata->sensor_settings->drdy_irq.int2.mask) {
266 dev_err(parent, "DRDY on INT2 not available.\n");
267 return -EINVAL;
268 }
269 sdata->drdy_int_pin = 2;
270 break;
271 default:
272 dev_err(parent, "DRDY on pdata not valid.\n");
273 return -EINVAL;
274 }
275
276 if (pdata->open_drain) {
277 if (!sdata->sensor_settings->drdy_irq.int1.addr_od &&
278 !sdata->sensor_settings->drdy_irq.int2.addr_od)
279 dev_err(parent,
280 "open drain requested but unsupported.\n");
281 else
282 sdata->int_pin_open_drain = true;
283 }
284
285 return 0;
286 }
287
st_sensors_dev_probe(struct device * dev,struct st_sensors_platform_data * defdata)288 static struct st_sensors_platform_data *st_sensors_dev_probe(struct device *dev,
289 struct st_sensors_platform_data *defdata)
290 {
291 struct st_sensors_platform_data *pdata;
292 u32 val;
293
294 if (!dev_fwnode(dev))
295 return NULL;
296
297 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
298 if (!pdata)
299 return ERR_PTR(-ENOMEM);
300 if (!device_property_read_u32(dev, "st,drdy-int-pin", &val) && (val <= 2))
301 pdata->drdy_int_pin = (u8) val;
302 else
303 pdata->drdy_int_pin = defdata ? defdata->drdy_int_pin : 0;
304
305 pdata->open_drain = device_property_read_bool(dev, "drive-open-drain");
306
307 return pdata;
308 }
309
310 /**
311 * st_sensors_dev_name_probe() - device probe for ST sensor name
312 * @dev: driver model representation of the device.
313 * @name: device name buffer reference.
314 * @len: device name buffer length.
315 *
316 * In effect this function matches an ID to an internal kernel
317 * name for a certain sensor device, so that the rest of the autodetection can
318 * rely on that name from this point on. I2C/SPI devices will be renamed
319 * to match the internal kernel convention.
320 */
st_sensors_dev_name_probe(struct device * dev,char * name,int len)321 void st_sensors_dev_name_probe(struct device *dev, char *name, int len)
322 {
323 const void *match;
324
325 match = device_get_match_data(dev);
326 if (!match)
327 return;
328
329 /* The name from the match takes precedence if present */
330 strscpy(name, match, len);
331 }
332 EXPORT_SYMBOL_NS(st_sensors_dev_name_probe, "IIO_ST_SENSORS");
333
st_sensors_init_sensor(struct iio_dev * indio_dev,struct st_sensors_platform_data * pdata)334 int st_sensors_init_sensor(struct iio_dev *indio_dev,
335 struct st_sensors_platform_data *pdata)
336 {
337 struct device *parent = indio_dev->dev.parent;
338 struct st_sensor_data *sdata = iio_priv(indio_dev);
339 struct st_sensors_platform_data *of_pdata;
340 int err = 0;
341
342 mutex_init(&sdata->odr_lock);
343
344 /* If OF/DT pdata exists, it will take precedence of anything else */
345 of_pdata = st_sensors_dev_probe(parent, pdata);
346 if (IS_ERR(of_pdata))
347 return PTR_ERR(of_pdata);
348 if (of_pdata)
349 pdata = of_pdata;
350
351 if (pdata) {
352 err = st_sensors_set_drdy_int_pin(indio_dev, pdata);
353 if (err < 0)
354 return err;
355 }
356
357 err = st_sensors_set_enable(indio_dev, false);
358 if (err < 0)
359 return err;
360
361 /* Disable DRDY, this might be still be enabled after reboot. */
362 err = st_sensors_set_dataready_irq(indio_dev, false);
363 if (err < 0)
364 return err;
365
366 if (sdata->current_fullscale) {
367 err = st_sensors_set_fullscale(indio_dev,
368 sdata->current_fullscale->num);
369 if (err < 0)
370 return err;
371 } else
372 dev_info(parent, "Full-scale not possible\n");
373
374 err = st_sensors_set_odr(indio_dev, sdata->odr);
375 if (err < 0)
376 return err;
377
378 /* set BDU */
379 if (sdata->sensor_settings->bdu.addr) {
380 err = st_sensors_write_data_with_mask(indio_dev,
381 sdata->sensor_settings->bdu.addr,
382 sdata->sensor_settings->bdu.mask, true);
383 if (err < 0)
384 return err;
385 }
386
387 /* set DAS */
388 if (sdata->sensor_settings->das.addr) {
389 err = st_sensors_write_data_with_mask(indio_dev,
390 sdata->sensor_settings->das.addr,
391 sdata->sensor_settings->das.mask, 1);
392 if (err < 0)
393 return err;
394 }
395
396 if (sdata->int_pin_open_drain) {
397 u8 addr, mask;
398
399 if (sdata->drdy_int_pin == 1) {
400 addr = sdata->sensor_settings->drdy_irq.int1.addr_od;
401 mask = sdata->sensor_settings->drdy_irq.int1.mask_od;
402 } else {
403 addr = sdata->sensor_settings->drdy_irq.int2.addr_od;
404 mask = sdata->sensor_settings->drdy_irq.int2.mask_od;
405 }
406
407 dev_info(parent,
408 "set interrupt line to open drain mode on pin %d\n",
409 sdata->drdy_int_pin);
410 err = st_sensors_write_data_with_mask(indio_dev, addr,
411 mask, 1);
412 if (err < 0)
413 return err;
414 }
415
416 err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
417
418 return err;
419 }
420 EXPORT_SYMBOL_NS(st_sensors_init_sensor, "IIO_ST_SENSORS");
421
st_sensors_set_dataready_irq(struct iio_dev * indio_dev,bool enable)422 int st_sensors_set_dataready_irq(struct iio_dev *indio_dev, bool enable)
423 {
424 int err;
425 u8 drdy_addr, drdy_mask;
426 struct st_sensor_data *sdata = iio_priv(indio_dev);
427
428 if (!sdata->sensor_settings->drdy_irq.int1.addr &&
429 !sdata->sensor_settings->drdy_irq.int2.addr) {
430 /*
431 * there are some devices (e.g. LIS3MDL) where drdy line is
432 * routed to a given pin and it is not possible to select a
433 * different one. Take into account irq status register
434 * to understand if irq trigger can be properly supported
435 */
436 if (sdata->sensor_settings->drdy_irq.stat_drdy.addr)
437 sdata->hw_irq_trigger = enable;
438 return 0;
439 }
440
441 /* Enable/Disable the interrupt generator 1. */
442 if (sdata->sensor_settings->drdy_irq.ig1.en_addr > 0) {
443 err = st_sensors_write_data_with_mask(indio_dev,
444 sdata->sensor_settings->drdy_irq.ig1.en_addr,
445 sdata->sensor_settings->drdy_irq.ig1.en_mask,
446 (int)enable);
447 if (err < 0)
448 goto st_accel_set_dataready_irq_error;
449 }
450
451 if (sdata->drdy_int_pin == 1) {
452 drdy_addr = sdata->sensor_settings->drdy_irq.int1.addr;
453 drdy_mask = sdata->sensor_settings->drdy_irq.int1.mask;
454 } else {
455 drdy_addr = sdata->sensor_settings->drdy_irq.int2.addr;
456 drdy_mask = sdata->sensor_settings->drdy_irq.int2.mask;
457 }
458
459 /* Flag to the poll function that the hardware trigger is in use */
460 sdata->hw_irq_trigger = enable;
461
462 /* Enable/Disable the interrupt generator for data ready. */
463 err = st_sensors_write_data_with_mask(indio_dev, drdy_addr,
464 drdy_mask, (int)enable);
465
466 st_accel_set_dataready_irq_error:
467 return err;
468 }
469 EXPORT_SYMBOL_NS(st_sensors_set_dataready_irq, "IIO_ST_SENSORS");
470
st_sensors_set_fullscale_by_gain(struct iio_dev * indio_dev,int scale)471 int st_sensors_set_fullscale_by_gain(struct iio_dev *indio_dev, int scale)
472 {
473 int err = -EINVAL, i;
474 struct st_sensor_data *sdata = iio_priv(indio_dev);
475
476 for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
477 if ((sdata->sensor_settings->fs.fs_avl[i].gain == scale) &&
478 (sdata->sensor_settings->fs.fs_avl[i].gain != 0)) {
479 err = 0;
480 break;
481 }
482 }
483 if (err < 0)
484 goto st_sensors_match_scale_error;
485
486 err = st_sensors_set_fullscale(indio_dev,
487 sdata->sensor_settings->fs.fs_avl[i].num);
488
489 st_sensors_match_scale_error:
490 return err;
491 }
492 EXPORT_SYMBOL_NS(st_sensors_set_fullscale_by_gain, "IIO_ST_SENSORS");
493
st_sensors_read_axis_data(struct iio_dev * indio_dev,struct iio_chan_spec const * ch,int * data)494 static int st_sensors_read_axis_data(struct iio_dev *indio_dev,
495 struct iio_chan_spec const *ch, int *data)
496 {
497 int err;
498 u8 *outdata;
499 struct st_sensor_data *sdata = iio_priv(indio_dev);
500 unsigned int byte_for_channel;
501
502 byte_for_channel = DIV_ROUND_UP(ch->scan_type.realbits +
503 ch->scan_type.shift, 8);
504 outdata = kmalloc(byte_for_channel, GFP_DMA | GFP_KERNEL);
505 if (!outdata)
506 return -ENOMEM;
507
508 err = regmap_bulk_read(sdata->regmap, ch->address,
509 outdata, byte_for_channel);
510 if (err < 0)
511 goto st_sensors_free_memory;
512
513 if (byte_for_channel == 1)
514 *data = (s8)*outdata;
515 else if (byte_for_channel == 2)
516 *data = (s16)get_unaligned_le16(outdata);
517 else if (byte_for_channel == 3)
518 *data = (s32)sign_extend32(get_unaligned_le24(outdata), 23);
519
520 st_sensors_free_memory:
521 kfree(outdata);
522
523 return err;
524 }
525
st_sensors_read_info_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * ch,int * val)526 int st_sensors_read_info_raw(struct iio_dev *indio_dev,
527 struct iio_chan_spec const *ch, int *val)
528 {
529 int err;
530 struct st_sensor_data *sdata = iio_priv(indio_dev);
531
532 if (!iio_device_claim_direct(indio_dev))
533 return -EBUSY;
534
535 mutex_lock(&sdata->odr_lock);
536
537 err = st_sensors_set_enable(indio_dev, true);
538 if (err < 0)
539 goto out;
540
541 msleep((sdata->sensor_settings->bootime * 1000) / sdata->odr);
542 err = st_sensors_read_axis_data(indio_dev, ch, val);
543 if (err < 0)
544 goto out;
545
546 *val = *val >> ch->scan_type.shift;
547
548 err = st_sensors_set_enable(indio_dev, false);
549
550 out:
551 mutex_unlock(&sdata->odr_lock);
552 iio_device_release_direct(indio_dev);
553
554 return err;
555 }
556 EXPORT_SYMBOL_NS(st_sensors_read_info_raw, "IIO_ST_SENSORS");
557
558 /*
559 * st_sensors_get_settings_index() - get index of the sensor settings for a
560 * specific device from list of settings
561 * @name: device name buffer reference.
562 * @list: sensor settings list.
563 * @list_length: length of sensor settings list.
564 *
565 * Return: non negative number on success (valid index),
566 * negative error code otherwise.
567 */
st_sensors_get_settings_index(const char * name,const struct st_sensor_settings * list,const int list_length)568 int st_sensors_get_settings_index(const char *name,
569 const struct st_sensor_settings *list,
570 const int list_length)
571 {
572 int i, n;
573
574 for (i = 0; i < list_length; i++) {
575 for (n = 0; n < ST_SENSORS_MAX_4WAI; n++) {
576 if (strcmp(name, list[i].sensors_supported[n]) == 0)
577 return i;
578 }
579 }
580
581 return -ENODEV;
582 }
583 EXPORT_SYMBOL_NS(st_sensors_get_settings_index, "IIO_ST_SENSORS");
584
585 /*
586 * st_sensors_verify_id() - verify sensor ID (WhoAmI) is matching with the
587 * expected value
588 * @indio_dev: IIO device reference.
589 *
590 * Return: 0 on success (valid sensor ID), else a negative error code.
591 */
st_sensors_verify_id(struct iio_dev * indio_dev)592 int st_sensors_verify_id(struct iio_dev *indio_dev)
593 {
594 struct st_sensor_data *sdata = iio_priv(indio_dev);
595 struct device *parent = indio_dev->dev.parent;
596 int wai, err;
597
598 if (sdata->sensor_settings->wai_addr) {
599 err = regmap_read(sdata->regmap,
600 sdata->sensor_settings->wai_addr, &wai);
601 if (err < 0) {
602 return dev_err_probe(parent, err,
603 "failed to read Who-Am-I register.\n");
604 }
605
606 if (sdata->sensor_settings->wai != wai) {
607 dev_warn(parent, "%s: WhoAmI mismatch (0x%x).\n",
608 indio_dev->name, wai);
609 }
610 }
611
612 return 0;
613 }
614 EXPORT_SYMBOL_NS(st_sensors_verify_id, "IIO_ST_SENSORS");
615
st_sensors_sysfs_sampling_frequency_avail(struct device * dev,struct device_attribute * attr,char * buf)616 ssize_t st_sensors_sysfs_sampling_frequency_avail(struct device *dev,
617 struct device_attribute *attr, char *buf)
618 {
619 int i, len = 0;
620 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
621 struct st_sensor_data *sdata = iio_priv(indio_dev);
622
623 for (i = 0; i < ST_SENSORS_ODR_LIST_MAX; i++) {
624 if (sdata->sensor_settings->odr.odr_avl[i].hz == 0)
625 break;
626
627 len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
628 sdata->sensor_settings->odr.odr_avl[i].hz);
629 }
630 buf[len - 1] = '\n';
631
632 return len;
633 }
634 EXPORT_SYMBOL_NS(st_sensors_sysfs_sampling_frequency_avail, "IIO_ST_SENSORS");
635
st_sensors_sysfs_scale_avail(struct device * dev,struct device_attribute * attr,char * buf)636 ssize_t st_sensors_sysfs_scale_avail(struct device *dev,
637 struct device_attribute *attr, char *buf)
638 {
639 int i, len = 0, q, r;
640 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
641 struct st_sensor_data *sdata = iio_priv(indio_dev);
642
643 for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
644 if (sdata->sensor_settings->fs.fs_avl[i].num == 0)
645 break;
646
647 q = sdata->sensor_settings->fs.fs_avl[i].gain / 1000000;
648 r = sdata->sensor_settings->fs.fs_avl[i].gain % 1000000;
649
650 len += scnprintf(buf + len, PAGE_SIZE - len, "%u.%06u ", q, r);
651 }
652 buf[len - 1] = '\n';
653
654 return len;
655 }
656 EXPORT_SYMBOL_NS(st_sensors_sysfs_scale_avail, "IIO_ST_SENSORS");
657
658 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
659 MODULE_DESCRIPTION("STMicroelectronics ST-sensors core");
660 MODULE_LICENSE("GPL v2");
661