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 int 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(indio_dev->dev.parent, "vdd");
238 if (IS_ERR(pdata->vdd)) {
239 dev_err(&indio_dev->dev, "unable to get Vdd supply\n");
240 return PTR_ERR(pdata->vdd);
242 err = regulator_enable(pdata->vdd);
244 dev_warn(&indio_dev->dev,
245 "Failed to enable specified Vdd supply\n");
249 pdata->vdd_io = devm_regulator_get(indio_dev->dev.parent, "vddio");
250 if (IS_ERR(pdata->vdd_io)) {
251 dev_err(&indio_dev->dev, "unable to get Vdd_IO supply\n");
252 err = PTR_ERR(pdata->vdd_io);
253 goto st_sensors_disable_vdd;
255 err = regulator_enable(pdata->vdd_io);
257 dev_warn(&indio_dev->dev,
258 "Failed to enable specified Vdd_IO supply\n");
259 goto st_sensors_disable_vdd;
264 st_sensors_disable_vdd:
265 regulator_disable(pdata->vdd);
268 EXPORT_SYMBOL(st_sensors_power_enable);
270 void st_sensors_power_disable(struct iio_dev *indio_dev)
272 struct st_sensor_data *pdata = iio_priv(indio_dev);
274 regulator_disable(pdata->vdd);
275 regulator_disable(pdata->vdd_io);
277 EXPORT_SYMBOL(st_sensors_power_disable);
279 static int st_sensors_set_drdy_int_pin(struct iio_dev *indio_dev,
280 struct st_sensors_platform_data *pdata)
282 struct st_sensor_data *sdata = iio_priv(indio_dev);
284 /* Sensor does not support interrupts */
285 if (sdata->sensor_settings->drdy_irq.addr == 0) {
286 if (pdata->drdy_int_pin)
287 dev_info(&indio_dev->dev,
288 "DRDY on pin INT%d specified, but sensor "
289 "does not support interrupts\n",
290 pdata->drdy_int_pin);
294 switch (pdata->drdy_int_pin) {
296 if (sdata->sensor_settings->drdy_irq.mask_int1 == 0) {
297 dev_err(&indio_dev->dev,
298 "DRDY on INT1 not available.\n");
301 sdata->drdy_int_pin = 1;
304 if (sdata->sensor_settings->drdy_irq.mask_int2 == 0) {
305 dev_err(&indio_dev->dev,
306 "DRDY on INT2 not available.\n");
309 sdata->drdy_int_pin = 2;
312 dev_err(&indio_dev->dev, "DRDY on pdata not valid.\n");
316 if (pdata->open_drain) {
317 if (!sdata->sensor_settings->drdy_irq.addr_od)
318 dev_err(&indio_dev->dev,
319 "open drain requested but unsupported.\n");
321 sdata->int_pin_open_drain = true;
328 static struct st_sensors_platform_data *st_sensors_of_probe(struct device *dev,
329 struct st_sensors_platform_data *defdata)
331 struct st_sensors_platform_data *pdata;
332 struct device_node *np = dev->of_node;
338 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
339 if (!of_property_read_u32(np, "st,drdy-int-pin", &val) && (val <= 2))
340 pdata->drdy_int_pin = (u8) val;
342 pdata->drdy_int_pin = defdata ? defdata->drdy_int_pin : 0;
344 pdata->open_drain = of_property_read_bool(np, "drive-open-drain");
349 static struct st_sensors_platform_data *st_sensors_of_probe(struct device *dev,
350 struct st_sensors_platform_data *defdata)
356 int st_sensors_init_sensor(struct iio_dev *indio_dev,
357 struct st_sensors_platform_data *pdata)
359 struct st_sensor_data *sdata = iio_priv(indio_dev);
360 struct st_sensors_platform_data *of_pdata;
363 /* If OF/DT pdata exists, it will take precedence of anything else */
364 of_pdata = st_sensors_of_probe(indio_dev->dev.parent, pdata);
369 err = st_sensors_set_drdy_int_pin(indio_dev, pdata);
374 err = st_sensors_set_enable(indio_dev, false);
378 /* Disable DRDY, this might be still be enabled after reboot. */
379 err = st_sensors_set_dataready_irq(indio_dev, false);
383 if (sdata->current_fullscale) {
384 err = st_sensors_set_fullscale(indio_dev,
385 sdata->current_fullscale->num);
389 dev_info(&indio_dev->dev, "Full-scale not possible\n");
391 err = st_sensors_set_odr(indio_dev, sdata->odr);
396 if (sdata->sensor_settings->bdu.addr) {
397 err = st_sensors_write_data_with_mask(indio_dev,
398 sdata->sensor_settings->bdu.addr,
399 sdata->sensor_settings->bdu.mask, true);
405 if (sdata->sensor_settings->das.addr) {
406 err = st_sensors_write_data_with_mask(indio_dev,
407 sdata->sensor_settings->das.addr,
408 sdata->sensor_settings->das.mask, 1);
413 if (sdata->int_pin_open_drain) {
414 dev_info(&indio_dev->dev,
415 "set interrupt line to open drain mode\n");
416 err = st_sensors_write_data_with_mask(indio_dev,
417 sdata->sensor_settings->drdy_irq.addr_od,
418 sdata->sensor_settings->drdy_irq.mask_od, 1);
423 err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
427 EXPORT_SYMBOL(st_sensors_init_sensor);
429 int st_sensors_set_dataready_irq(struct iio_dev *indio_dev, bool enable)
433 struct st_sensor_data *sdata = iio_priv(indio_dev);
435 if (!sdata->sensor_settings->drdy_irq.addr)
438 /* Enable/Disable the interrupt generator 1. */
439 if (sdata->sensor_settings->drdy_irq.ig1.en_addr > 0) {
440 err = st_sensors_write_data_with_mask(indio_dev,
441 sdata->sensor_settings->drdy_irq.ig1.en_addr,
442 sdata->sensor_settings->drdy_irq.ig1.en_mask,
445 goto st_accel_set_dataready_irq_error;
448 if (sdata->drdy_int_pin == 1)
449 drdy_mask = sdata->sensor_settings->drdy_irq.mask_int1;
451 drdy_mask = sdata->sensor_settings->drdy_irq.mask_int2;
453 /* Flag to the poll function that the hardware trigger is in use */
454 sdata->hw_irq_trigger = enable;
456 /* Enable/Disable the interrupt generator for data ready. */
457 err = st_sensors_write_data_with_mask(indio_dev,
458 sdata->sensor_settings->drdy_irq.addr,
459 drdy_mask, (int)enable);
461 st_accel_set_dataready_irq_error:
464 EXPORT_SYMBOL(st_sensors_set_dataready_irq);
466 int st_sensors_set_fullscale_by_gain(struct iio_dev *indio_dev, int scale)
468 int err = -EINVAL, i;
469 struct st_sensor_data *sdata = iio_priv(indio_dev);
471 for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
472 if ((sdata->sensor_settings->fs.fs_avl[i].gain == scale) &&
473 (sdata->sensor_settings->fs.fs_avl[i].gain != 0)) {
479 goto st_sensors_match_scale_error;
481 err = st_sensors_set_fullscale(indio_dev,
482 sdata->sensor_settings->fs.fs_avl[i].num);
484 st_sensors_match_scale_error:
487 EXPORT_SYMBOL(st_sensors_set_fullscale_by_gain);
489 static int st_sensors_read_axis_data(struct iio_dev *indio_dev,
490 struct iio_chan_spec const *ch, int *data)
494 struct st_sensor_data *sdata = iio_priv(indio_dev);
495 unsigned int byte_for_channel;
497 byte_for_channel = DIV_ROUND_UP(ch->scan_type.realbits +
498 ch->scan_type.shift, 8);
499 outdata = kmalloc(byte_for_channel, GFP_KERNEL);
503 err = sdata->tf->read_multiple_byte(&sdata->tb, sdata->dev,
504 ch->address, byte_for_channel,
505 outdata, sdata->multiread_bit);
507 goto st_sensors_free_memory;
509 if (byte_for_channel == 1)
510 *data = (s8)*outdata;
511 else if (byte_for_channel == 2)
512 *data = (s16)get_unaligned_le16(outdata);
513 else if (byte_for_channel == 3)
514 *data = (s32)st_sensors_get_unaligned_le24(outdata);
516 st_sensors_free_memory:
522 int st_sensors_read_info_raw(struct iio_dev *indio_dev,
523 struct iio_chan_spec const *ch, int *val)
526 struct st_sensor_data *sdata = iio_priv(indio_dev);
528 mutex_lock(&indio_dev->mlock);
529 if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) {
533 err = st_sensors_set_enable(indio_dev, true);
537 msleep((sdata->sensor_settings->bootime * 1000) / sdata->odr);
538 err = st_sensors_read_axis_data(indio_dev, ch, val);
542 *val = *val >> ch->scan_type.shift;
544 err = st_sensors_set_enable(indio_dev, false);
547 mutex_unlock(&indio_dev->mlock);
551 EXPORT_SYMBOL(st_sensors_read_info_raw);
553 int st_sensors_check_device_support(struct iio_dev *indio_dev,
554 int num_sensors_list,
555 const struct st_sensor_settings *sensor_settings)
559 struct st_sensor_data *sdata = iio_priv(indio_dev);
561 for (i = 0; i < num_sensors_list; i++) {
562 for (n = 0; n < ST_SENSORS_MAX_4WAI; n++) {
563 if (strcmp(indio_dev->name,
564 sensor_settings[i].sensors_supported[n]) == 0) {
568 if (n < ST_SENSORS_MAX_4WAI)
571 if (i == num_sensors_list) {
572 dev_err(&indio_dev->dev, "device name %s not recognized.\n",
577 if (sensor_settings[i].wai_addr) {
578 err = sdata->tf->read_byte(&sdata->tb, sdata->dev,
579 sensor_settings[i].wai_addr, &wai);
581 dev_err(&indio_dev->dev,
582 "failed to read Who-Am-I register.\n");
586 if (sensor_settings[i].wai != wai) {
587 dev_err(&indio_dev->dev,
588 "%s: WhoAmI mismatch (0x%x).\n",
589 indio_dev->name, wai);
594 sdata->sensor_settings =
595 (struct st_sensor_settings *)&sensor_settings[i];
599 EXPORT_SYMBOL(st_sensors_check_device_support);
601 ssize_t st_sensors_sysfs_sampling_frequency_avail(struct device *dev,
602 struct device_attribute *attr, char *buf)
605 struct iio_dev *indio_dev = dev_get_drvdata(dev);
606 struct st_sensor_data *sdata = iio_priv(indio_dev);
608 mutex_lock(&indio_dev->mlock);
609 for (i = 0; i < ST_SENSORS_ODR_LIST_MAX; i++) {
610 if (sdata->sensor_settings->odr.odr_avl[i].hz == 0)
613 len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
614 sdata->sensor_settings->odr.odr_avl[i].hz);
616 mutex_unlock(&indio_dev->mlock);
621 EXPORT_SYMBOL(st_sensors_sysfs_sampling_frequency_avail);
623 ssize_t st_sensors_sysfs_scale_avail(struct device *dev,
624 struct device_attribute *attr, char *buf)
626 int i, len = 0, q, r;
627 struct iio_dev *indio_dev = dev_get_drvdata(dev);
628 struct st_sensor_data *sdata = iio_priv(indio_dev);
630 mutex_lock(&indio_dev->mlock);
631 for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
632 if (sdata->sensor_settings->fs.fs_avl[i].num == 0)
635 q = sdata->sensor_settings->fs.fs_avl[i].gain / 1000000;
636 r = sdata->sensor_settings->fs.fs_avl[i].gain % 1000000;
638 len += scnprintf(buf + len, PAGE_SIZE - len, "%u.%06u ", q, r);
640 mutex_unlock(&indio_dev->mlock);
645 EXPORT_SYMBOL(st_sensors_sysfs_scale_avail);
647 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
648 MODULE_DESCRIPTION("STMicroelectronics ST-sensors core");
649 MODULE_LICENSE("GPL v2");