2 * STMicroelectronics sensors core library driver
4 * Copyright 2012-2013 STMicroelectronics Inc.
6 * Denis Ciocca <denis.ciocca@st.com>
8 * Licensed under the GPL-2.
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/delay.h>
15 #include <linux/iio/iio.h>
16 #include <linux/regulator/consumer.h>
18 #include <asm/unaligned.h>
19 #include <linux/iio/common/st_sensors.h>
21 #include "st_sensors_core.h"
23 static inline u32 st_sensors_get_unaligned_le24(const u8 *p)
25 return (s32)((p[0] | p[1] << 8 | p[2] << 16) << 8) >> 8;
28 int st_sensors_write_data_with_mask(struct iio_dev *indio_dev,
29 u8 reg_addr, u8 mask, u8 data)
33 struct st_sensor_data *sdata = iio_priv(indio_dev);
35 err = sdata->tf->read_byte(&sdata->tb, sdata->dev, reg_addr, &new_data);
37 goto st_sensors_write_data_with_mask_error;
39 new_data = ((new_data & (~mask)) | ((data << __ffs(mask)) & mask));
40 err = sdata->tf->write_byte(&sdata->tb, sdata->dev, reg_addr, new_data);
42 st_sensors_write_data_with_mask_error:
46 int st_sensors_debugfs_reg_access(struct iio_dev *indio_dev,
47 unsigned reg, unsigned writeval,
50 struct st_sensor_data *sdata = iio_priv(indio_dev);
55 return sdata->tf->write_byte(&sdata->tb, sdata->dev,
56 (u8)reg, (u8)writeval);
58 err = sdata->tf->read_byte(&sdata->tb, sdata->dev, (u8)reg, &readdata);
62 *readval = (unsigned)readdata;
66 EXPORT_SYMBOL(st_sensors_debugfs_reg_access);
68 static int st_sensors_match_odr(struct st_sensor_settings *sensor_settings,
69 unsigned int odr, struct st_sensor_odr_avl *odr_out)
73 for (i = 0; i < ST_SENSORS_ODR_LIST_MAX; i++) {
74 if (sensor_settings->odr.odr_avl[i].hz == 0)
75 goto st_sensors_match_odr_error;
77 if (sensor_settings->odr.odr_avl[i].hz == odr) {
78 odr_out->hz = sensor_settings->odr.odr_avl[i].hz;
79 odr_out->value = sensor_settings->odr.odr_avl[i].value;
85 st_sensors_match_odr_error:
89 int st_sensors_set_odr(struct iio_dev *indio_dev, unsigned int odr)
92 struct st_sensor_odr_avl odr_out = {0, 0};
93 struct st_sensor_data *sdata = iio_priv(indio_dev);
95 err = st_sensors_match_odr(sdata->sensor_settings, odr, &odr_out);
97 goto st_sensors_match_odr_error;
99 if ((sdata->sensor_settings->odr.addr ==
100 sdata->sensor_settings->pw.addr) &&
101 (sdata->sensor_settings->odr.mask ==
102 sdata->sensor_settings->pw.mask)) {
103 if (sdata->enabled == true) {
104 err = st_sensors_write_data_with_mask(indio_dev,
105 sdata->sensor_settings->odr.addr,
106 sdata->sensor_settings->odr.mask,
112 err = st_sensors_write_data_with_mask(indio_dev,
113 sdata->sensor_settings->odr.addr,
114 sdata->sensor_settings->odr.mask,
118 sdata->odr = odr_out.hz;
120 st_sensors_match_odr_error:
123 EXPORT_SYMBOL(st_sensors_set_odr);
125 static int st_sensors_match_fs(struct st_sensor_settings *sensor_settings,
126 unsigned int fs, int *index_fs_avl)
128 int i, ret = -EINVAL;
130 for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
131 if (sensor_settings->fs.fs_avl[i].num == 0)
132 goto st_sensors_match_odr_error;
134 if (sensor_settings->fs.fs_avl[i].num == fs) {
141 st_sensors_match_odr_error:
145 static int st_sensors_set_fullscale(struct iio_dev *indio_dev, unsigned int fs)
148 struct st_sensor_data *sdata = iio_priv(indio_dev);
150 if (sdata->sensor_settings->fs.addr == 0)
153 err = st_sensors_match_fs(sdata->sensor_settings, fs, &i);
155 goto st_accel_set_fullscale_error;
157 err = st_sensors_write_data_with_mask(indio_dev,
158 sdata->sensor_settings->fs.addr,
159 sdata->sensor_settings->fs.mask,
160 sdata->sensor_settings->fs.fs_avl[i].value);
162 goto st_accel_set_fullscale_error;
164 sdata->current_fullscale = (struct st_sensor_fullscale_avl *)
165 &sdata->sensor_settings->fs.fs_avl[i];
168 st_accel_set_fullscale_error:
169 dev_err(&indio_dev->dev, "failed to set new fullscale.\n");
173 int st_sensors_set_enable(struct iio_dev *indio_dev, bool enable)
178 struct st_sensor_odr_avl odr_out = {0, 0};
179 struct st_sensor_data *sdata = iio_priv(indio_dev);
182 tmp_value = sdata->sensor_settings->pw.value_on;
183 if ((sdata->sensor_settings->odr.addr ==
184 sdata->sensor_settings->pw.addr) &&
185 (sdata->sensor_settings->odr.mask ==
186 sdata->sensor_settings->pw.mask)) {
187 err = st_sensors_match_odr(sdata->sensor_settings,
188 sdata->odr, &odr_out);
190 goto set_enable_error;
191 tmp_value = odr_out.value;
194 err = st_sensors_write_data_with_mask(indio_dev,
195 sdata->sensor_settings->pw.addr,
196 sdata->sensor_settings->pw.mask, tmp_value);
198 goto set_enable_error;
200 sdata->enabled = true;
203 sdata->odr = odr_out.hz;
205 err = st_sensors_write_data_with_mask(indio_dev,
206 sdata->sensor_settings->pw.addr,
207 sdata->sensor_settings->pw.mask,
208 sdata->sensor_settings->pw.value_off);
210 goto set_enable_error;
212 sdata->enabled = false;
218 EXPORT_SYMBOL(st_sensors_set_enable);
220 int st_sensors_set_axis_enable(struct iio_dev *indio_dev, u8 axis_enable)
222 struct st_sensor_data *sdata = iio_priv(indio_dev);
224 return st_sensors_write_data_with_mask(indio_dev,
225 sdata->sensor_settings->enable_axis.addr,
226 sdata->sensor_settings->enable_axis.mask,
229 EXPORT_SYMBOL(st_sensors_set_axis_enable);
231 void st_sensors_power_enable(struct iio_dev *indio_dev)
233 struct st_sensor_data *pdata = iio_priv(indio_dev);
236 /* Regulators not mandatory, but if requested we should enable them. */
237 pdata->vdd = devm_regulator_get_optional(indio_dev->dev.parent, "vdd");
238 if (!IS_ERR(pdata->vdd)) {
239 err = regulator_enable(pdata->vdd);
241 dev_warn(&indio_dev->dev,
242 "Failed to enable specified Vdd supply\n");
245 pdata->vdd_io = devm_regulator_get_optional(indio_dev->dev.parent, "vddio");
246 if (!IS_ERR(pdata->vdd_io)) {
247 err = regulator_enable(pdata->vdd_io);
249 dev_warn(&indio_dev->dev,
250 "Failed to enable specified Vdd_IO supply\n");
253 EXPORT_SYMBOL(st_sensors_power_enable);
255 void st_sensors_power_disable(struct iio_dev *indio_dev)
257 struct st_sensor_data *pdata = iio_priv(indio_dev);
259 if (!IS_ERR(pdata->vdd))
260 regulator_disable(pdata->vdd);
262 if (!IS_ERR(pdata->vdd_io))
263 regulator_disable(pdata->vdd_io);
265 EXPORT_SYMBOL(st_sensors_power_disable);
267 static int st_sensors_set_drdy_int_pin(struct iio_dev *indio_dev,
268 struct st_sensors_platform_data *pdata)
270 struct st_sensor_data *sdata = iio_priv(indio_dev);
272 /* Sensor does not support interrupts */
273 if (sdata->sensor_settings->drdy_irq.addr == 0) {
274 if (pdata->drdy_int_pin)
275 dev_info(&indio_dev->dev,
276 "DRDY on pin INT%d specified, but sensor "
277 "does not support interrupts\n",
278 pdata->drdy_int_pin);
282 switch (pdata->drdy_int_pin) {
284 if (sdata->sensor_settings->drdy_irq.mask_int1 == 0) {
285 dev_err(&indio_dev->dev,
286 "DRDY on INT1 not available.\n");
289 sdata->drdy_int_pin = 1;
292 if (sdata->sensor_settings->drdy_irq.mask_int2 == 0) {
293 dev_err(&indio_dev->dev,
294 "DRDY on INT2 not available.\n");
297 sdata->drdy_int_pin = 2;
300 dev_err(&indio_dev->dev, "DRDY on pdata not valid.\n");
308 static struct st_sensors_platform_data *st_sensors_of_probe(struct device *dev,
309 struct st_sensors_platform_data *defdata)
311 struct st_sensors_platform_data *pdata;
312 struct device_node *np = dev->of_node;
318 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
319 if (!of_property_read_u32(np, "st,drdy-int-pin", &val) && (val <= 2))
320 pdata->drdy_int_pin = (u8) val;
322 pdata->drdy_int_pin = defdata ? defdata->drdy_int_pin : 0;
327 static struct st_sensors_platform_data *st_sensors_of_probe(struct device *dev,
328 struct st_sensors_platform_data *defdata)
334 int st_sensors_init_sensor(struct iio_dev *indio_dev,
335 struct st_sensors_platform_data *pdata)
337 struct st_sensor_data *sdata = iio_priv(indio_dev);
338 struct st_sensors_platform_data *of_pdata;
341 /* If OF/DT pdata exists, it will take precedence of anything else */
342 of_pdata = st_sensors_of_probe(indio_dev->dev.parent, pdata);
347 err = st_sensors_set_drdy_int_pin(indio_dev, pdata);
352 err = st_sensors_set_enable(indio_dev, false);
356 if (sdata->current_fullscale) {
357 err = st_sensors_set_fullscale(indio_dev,
358 sdata->current_fullscale->num);
362 dev_info(&indio_dev->dev, "Full-scale not possible\n");
364 err = st_sensors_set_odr(indio_dev, sdata->odr);
369 if (sdata->sensor_settings->bdu.addr) {
370 err = st_sensors_write_data_with_mask(indio_dev,
371 sdata->sensor_settings->bdu.addr,
372 sdata->sensor_settings->bdu.mask, true);
377 err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
381 EXPORT_SYMBOL(st_sensors_init_sensor);
383 int st_sensors_set_dataready_irq(struct iio_dev *indio_dev, bool enable)
387 struct st_sensor_data *sdata = iio_priv(indio_dev);
389 if (!sdata->sensor_settings->drdy_irq.addr)
392 /* Enable/Disable the interrupt generator 1. */
393 if (sdata->sensor_settings->drdy_irq.ig1.en_addr > 0) {
394 err = st_sensors_write_data_with_mask(indio_dev,
395 sdata->sensor_settings->drdy_irq.ig1.en_addr,
396 sdata->sensor_settings->drdy_irq.ig1.en_mask,
399 goto st_accel_set_dataready_irq_error;
402 if (sdata->drdy_int_pin == 1)
403 drdy_mask = sdata->sensor_settings->drdy_irq.mask_int1;
405 drdy_mask = sdata->sensor_settings->drdy_irq.mask_int2;
407 /* Enable/Disable the interrupt generator for data ready. */
408 err = st_sensors_write_data_with_mask(indio_dev,
409 sdata->sensor_settings->drdy_irq.addr,
410 drdy_mask, (int)enable);
412 st_accel_set_dataready_irq_error:
415 EXPORT_SYMBOL(st_sensors_set_dataready_irq);
417 int st_sensors_set_fullscale_by_gain(struct iio_dev *indio_dev, int scale)
419 int err = -EINVAL, i;
420 struct st_sensor_data *sdata = iio_priv(indio_dev);
422 for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
423 if ((sdata->sensor_settings->fs.fs_avl[i].gain == scale) &&
424 (sdata->sensor_settings->fs.fs_avl[i].gain != 0)) {
430 goto st_sensors_match_scale_error;
432 err = st_sensors_set_fullscale(indio_dev,
433 sdata->sensor_settings->fs.fs_avl[i].num);
435 st_sensors_match_scale_error:
438 EXPORT_SYMBOL(st_sensors_set_fullscale_by_gain);
440 static int st_sensors_read_axis_data(struct iio_dev *indio_dev,
441 struct iio_chan_spec const *ch, int *data)
445 struct st_sensor_data *sdata = iio_priv(indio_dev);
446 unsigned int byte_for_channel = ch->scan_type.storagebits >> 3;
448 outdata = kmalloc(byte_for_channel, GFP_KERNEL);
452 err = sdata->tf->read_multiple_byte(&sdata->tb, sdata->dev,
453 ch->address, byte_for_channel,
454 outdata, sdata->multiread_bit);
456 goto st_sensors_free_memory;
458 if (byte_for_channel == 1)
459 *data = (s8)*outdata;
460 else if (byte_for_channel == 2)
461 *data = (s16)get_unaligned_le16(outdata);
462 else if (byte_for_channel == 3)
463 *data = (s32)st_sensors_get_unaligned_le24(outdata);
465 st_sensors_free_memory:
471 int st_sensors_read_info_raw(struct iio_dev *indio_dev,
472 struct iio_chan_spec const *ch, int *val)
475 struct st_sensor_data *sdata = iio_priv(indio_dev);
477 mutex_lock(&indio_dev->mlock);
478 if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) {
482 err = st_sensors_set_enable(indio_dev, true);
486 msleep((sdata->sensor_settings->bootime * 1000) / sdata->odr);
487 err = st_sensors_read_axis_data(indio_dev, ch, val);
491 *val = *val >> ch->scan_type.shift;
493 err = st_sensors_set_enable(indio_dev, false);
496 mutex_unlock(&indio_dev->mlock);
500 EXPORT_SYMBOL(st_sensors_read_info_raw);
502 int st_sensors_check_device_support(struct iio_dev *indio_dev,
503 int num_sensors_list,
504 const struct st_sensor_settings *sensor_settings)
508 struct st_sensor_data *sdata = iio_priv(indio_dev);
510 for (i = 0; i < num_sensors_list; i++) {
511 for (n = 0; n < ST_SENSORS_MAX_4WAI; n++) {
512 if (strcmp(indio_dev->name,
513 sensor_settings[i].sensors_supported[n]) == 0) {
517 if (n < ST_SENSORS_MAX_4WAI)
520 if (i == num_sensors_list) {
521 dev_err(&indio_dev->dev, "device name %s not recognized.\n",
526 err = sdata->tf->read_byte(&sdata->tb, sdata->dev,
527 sensor_settings[i].wai_addr, &wai);
529 dev_err(&indio_dev->dev, "failed to read Who-Am-I register.\n");
533 if (sensor_settings[i].wai != wai) {
534 dev_err(&indio_dev->dev, "%s: WhoAmI mismatch (0x%x).\n",
535 indio_dev->name, wai);
539 sdata->sensor_settings =
540 (struct st_sensor_settings *)&sensor_settings[i];
544 EXPORT_SYMBOL(st_sensors_check_device_support);
546 ssize_t st_sensors_sysfs_sampling_frequency_avail(struct device *dev,
547 struct device_attribute *attr, char *buf)
550 struct iio_dev *indio_dev = dev_get_drvdata(dev);
551 struct st_sensor_data *sdata = iio_priv(indio_dev);
553 mutex_lock(&indio_dev->mlock);
554 for (i = 0; i < ST_SENSORS_ODR_LIST_MAX; i++) {
555 if (sdata->sensor_settings->odr.odr_avl[i].hz == 0)
558 len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
559 sdata->sensor_settings->odr.odr_avl[i].hz);
561 mutex_unlock(&indio_dev->mlock);
566 EXPORT_SYMBOL(st_sensors_sysfs_sampling_frequency_avail);
568 ssize_t st_sensors_sysfs_scale_avail(struct device *dev,
569 struct device_attribute *attr, char *buf)
572 struct iio_dev *indio_dev = dev_get_drvdata(dev);
573 struct st_sensor_data *sdata = iio_priv(indio_dev);
575 mutex_lock(&indio_dev->mlock);
576 for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
577 if (sdata->sensor_settings->fs.fs_avl[i].num == 0)
580 len += scnprintf(buf + len, PAGE_SIZE - len, "0.%06u ",
581 sdata->sensor_settings->fs.fs_avl[i].gain);
583 mutex_unlock(&indio_dev->mlock);
588 EXPORT_SYMBOL(st_sensors_sysfs_scale_avail);
590 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
591 MODULE_DESCRIPTION("STMicroelectronics ST-sensors core");
592 MODULE_LICENSE("GPL v2");