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");
304 if (pdata->open_drain) {
305 if (!sdata->sensor_settings->drdy_irq.addr_od)
306 dev_err(&indio_dev->dev,
307 "open drain requested but unsupported.\n");
309 sdata->int_pin_open_drain = true;
316 static struct st_sensors_platform_data *st_sensors_of_probe(struct device *dev,
317 struct st_sensors_platform_data *defdata)
319 struct st_sensors_platform_data *pdata;
320 struct device_node *np = dev->of_node;
326 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
327 if (!of_property_read_u32(np, "st,drdy-int-pin", &val) && (val <= 2))
328 pdata->drdy_int_pin = (u8) val;
330 pdata->drdy_int_pin = defdata ? defdata->drdy_int_pin : 0;
332 pdata->open_drain = of_property_read_bool(np, "drive-open-drain");
337 static struct st_sensors_platform_data *st_sensors_of_probe(struct device *dev,
338 struct st_sensors_platform_data *defdata)
344 int st_sensors_init_sensor(struct iio_dev *indio_dev,
345 struct st_sensors_platform_data *pdata)
347 struct st_sensor_data *sdata = iio_priv(indio_dev);
348 struct st_sensors_platform_data *of_pdata;
351 /* If OF/DT pdata exists, it will take precedence of anything else */
352 of_pdata = st_sensors_of_probe(indio_dev->dev.parent, pdata);
357 err = st_sensors_set_drdy_int_pin(indio_dev, pdata);
362 err = st_sensors_set_enable(indio_dev, false);
366 /* Disable DRDY, this might be still be enabled after reboot. */
367 err = st_sensors_set_dataready_irq(indio_dev, false);
371 if (sdata->current_fullscale) {
372 err = st_sensors_set_fullscale(indio_dev,
373 sdata->current_fullscale->num);
377 dev_info(&indio_dev->dev, "Full-scale not possible\n");
379 err = st_sensors_set_odr(indio_dev, sdata->odr);
384 if (sdata->sensor_settings->bdu.addr) {
385 err = st_sensors_write_data_with_mask(indio_dev,
386 sdata->sensor_settings->bdu.addr,
387 sdata->sensor_settings->bdu.mask, true);
392 if (sdata->int_pin_open_drain) {
393 dev_info(&indio_dev->dev,
394 "set interrupt line to open drain mode\n");
395 err = st_sensors_write_data_with_mask(indio_dev,
396 sdata->sensor_settings->drdy_irq.addr_od,
397 sdata->sensor_settings->drdy_irq.mask_od, 1);
402 err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
406 EXPORT_SYMBOL(st_sensors_init_sensor);
408 int st_sensors_set_dataready_irq(struct iio_dev *indio_dev, bool enable)
412 struct st_sensor_data *sdata = iio_priv(indio_dev);
414 if (!sdata->sensor_settings->drdy_irq.addr)
417 /* Enable/Disable the interrupt generator 1. */
418 if (sdata->sensor_settings->drdy_irq.ig1.en_addr > 0) {
419 err = st_sensors_write_data_with_mask(indio_dev,
420 sdata->sensor_settings->drdy_irq.ig1.en_addr,
421 sdata->sensor_settings->drdy_irq.ig1.en_mask,
424 goto st_accel_set_dataready_irq_error;
427 if (sdata->drdy_int_pin == 1)
428 drdy_mask = sdata->sensor_settings->drdy_irq.mask_int1;
430 drdy_mask = sdata->sensor_settings->drdy_irq.mask_int2;
432 /* Flag to the poll function that the hardware trigger is in use */
433 sdata->hw_irq_trigger = enable;
435 /* Enable/Disable the interrupt generator for data ready. */
436 err = st_sensors_write_data_with_mask(indio_dev,
437 sdata->sensor_settings->drdy_irq.addr,
438 drdy_mask, (int)enable);
440 st_accel_set_dataready_irq_error:
443 EXPORT_SYMBOL(st_sensors_set_dataready_irq);
445 int st_sensors_set_fullscale_by_gain(struct iio_dev *indio_dev, int scale)
447 int err = -EINVAL, i;
448 struct st_sensor_data *sdata = iio_priv(indio_dev);
450 for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
451 if ((sdata->sensor_settings->fs.fs_avl[i].gain == scale) &&
452 (sdata->sensor_settings->fs.fs_avl[i].gain != 0)) {
458 goto st_sensors_match_scale_error;
460 err = st_sensors_set_fullscale(indio_dev,
461 sdata->sensor_settings->fs.fs_avl[i].num);
463 st_sensors_match_scale_error:
466 EXPORT_SYMBOL(st_sensors_set_fullscale_by_gain);
468 static int st_sensors_read_axis_data(struct iio_dev *indio_dev,
469 struct iio_chan_spec const *ch, int *data)
473 struct st_sensor_data *sdata = iio_priv(indio_dev);
474 unsigned int byte_for_channel = ch->scan_type.storagebits >> 3;
476 outdata = kmalloc(byte_for_channel, GFP_KERNEL);
480 err = sdata->tf->read_multiple_byte(&sdata->tb, sdata->dev,
481 ch->address, byte_for_channel,
482 outdata, sdata->multiread_bit);
484 goto st_sensors_free_memory;
486 if (byte_for_channel == 1)
487 *data = (s8)*outdata;
488 else if (byte_for_channel == 2)
489 *data = (s16)get_unaligned_le16(outdata);
490 else if (byte_for_channel == 3)
491 *data = (s32)st_sensors_get_unaligned_le24(outdata);
493 st_sensors_free_memory:
499 int st_sensors_read_info_raw(struct iio_dev *indio_dev,
500 struct iio_chan_spec const *ch, int *val)
503 struct st_sensor_data *sdata = iio_priv(indio_dev);
505 mutex_lock(&indio_dev->mlock);
506 if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) {
510 err = st_sensors_set_enable(indio_dev, true);
514 msleep((sdata->sensor_settings->bootime * 1000) / sdata->odr);
515 err = st_sensors_read_axis_data(indio_dev, ch, val);
519 *val = *val >> ch->scan_type.shift;
521 err = st_sensors_set_enable(indio_dev, false);
524 mutex_unlock(&indio_dev->mlock);
528 EXPORT_SYMBOL(st_sensors_read_info_raw);
530 int st_sensors_check_device_support(struct iio_dev *indio_dev,
531 int num_sensors_list,
532 const struct st_sensor_settings *sensor_settings)
536 struct st_sensor_data *sdata = iio_priv(indio_dev);
538 for (i = 0; i < num_sensors_list; i++) {
539 for (n = 0; n < ST_SENSORS_MAX_4WAI; n++) {
540 if (strcmp(indio_dev->name,
541 sensor_settings[i].sensors_supported[n]) == 0) {
545 if (n < ST_SENSORS_MAX_4WAI)
548 if (i == num_sensors_list) {
549 dev_err(&indio_dev->dev, "device name %s not recognized.\n",
554 err = sdata->tf->read_byte(&sdata->tb, sdata->dev,
555 sensor_settings[i].wai_addr, &wai);
557 dev_err(&indio_dev->dev, "failed to read Who-Am-I register.\n");
561 if (sensor_settings[i].wai != wai) {
562 dev_err(&indio_dev->dev, "%s: WhoAmI mismatch (0x%x).\n",
563 indio_dev->name, wai);
567 sdata->sensor_settings =
568 (struct st_sensor_settings *)&sensor_settings[i];
572 EXPORT_SYMBOL(st_sensors_check_device_support);
574 ssize_t st_sensors_sysfs_sampling_frequency_avail(struct device *dev,
575 struct device_attribute *attr, char *buf)
578 struct iio_dev *indio_dev = dev_get_drvdata(dev);
579 struct st_sensor_data *sdata = iio_priv(indio_dev);
581 mutex_lock(&indio_dev->mlock);
582 for (i = 0; i < ST_SENSORS_ODR_LIST_MAX; i++) {
583 if (sdata->sensor_settings->odr.odr_avl[i].hz == 0)
586 len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
587 sdata->sensor_settings->odr.odr_avl[i].hz);
589 mutex_unlock(&indio_dev->mlock);
594 EXPORT_SYMBOL(st_sensors_sysfs_sampling_frequency_avail);
596 ssize_t st_sensors_sysfs_scale_avail(struct device *dev,
597 struct device_attribute *attr, char *buf)
600 struct iio_dev *indio_dev = dev_get_drvdata(dev);
601 struct st_sensor_data *sdata = iio_priv(indio_dev);
603 mutex_lock(&indio_dev->mlock);
604 for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
605 if (sdata->sensor_settings->fs.fs_avl[i].num == 0)
608 len += scnprintf(buf + len, PAGE_SIZE - len, "0.%06u ",
609 sdata->sensor_settings->fs.fs_avl[i].gain);
611 mutex_unlock(&indio_dev->mlock);
616 EXPORT_SYMBOL(st_sensors_sysfs_scale_avail);
618 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
619 MODULE_DESCRIPTION("STMicroelectronics ST-sensors core");
620 MODULE_LICENSE("GPL v2");