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>
22 #define ST_SENSORS_WAI_ADDRESS 0x0f
24 static inline u32 st_sensors_get_unaligned_le24(const u8 *p)
26 return (s32)((p[0] | p[1] << 8 | p[2] << 16) << 8) >> 8;
29 static int st_sensors_write_data_with_mask(struct iio_dev *indio_dev,
30 u8 reg_addr, u8 mask, u8 data)
34 struct st_sensor_data *sdata = iio_priv(indio_dev);
36 err = sdata->tf->read_byte(&sdata->tb, sdata->dev, reg_addr, &new_data);
38 goto st_sensors_write_data_with_mask_error;
40 new_data = ((new_data & (~mask)) | ((data << __ffs(mask)) & mask));
41 err = sdata->tf->write_byte(&sdata->tb, sdata->dev, reg_addr, new_data);
43 st_sensors_write_data_with_mask_error:
47 static int st_sensors_match_odr(struct st_sensor_settings *sensor_settings,
48 unsigned int odr, struct st_sensor_odr_avl *odr_out)
52 for (i = 0; i < ST_SENSORS_ODR_LIST_MAX; i++) {
53 if (sensor_settings->odr.odr_avl[i].hz == 0)
54 goto st_sensors_match_odr_error;
56 if (sensor_settings->odr.odr_avl[i].hz == odr) {
57 odr_out->hz = sensor_settings->odr.odr_avl[i].hz;
58 odr_out->value = sensor_settings->odr.odr_avl[i].value;
64 st_sensors_match_odr_error:
68 int st_sensors_set_odr(struct iio_dev *indio_dev, unsigned int odr)
71 struct st_sensor_odr_avl odr_out = {0, 0};
72 struct st_sensor_data *sdata = iio_priv(indio_dev);
74 err = st_sensors_match_odr(sdata->sensor_settings, odr, &odr_out);
76 goto st_sensors_match_odr_error;
78 if ((sdata->sensor_settings->odr.addr ==
79 sdata->sensor_settings->pw.addr) &&
80 (sdata->sensor_settings->odr.mask ==
81 sdata->sensor_settings->pw.mask)) {
82 if (sdata->enabled == true) {
83 err = st_sensors_write_data_with_mask(indio_dev,
84 sdata->sensor_settings->odr.addr,
85 sdata->sensor_settings->odr.mask,
91 err = st_sensors_write_data_with_mask(indio_dev,
92 sdata->sensor_settings->odr.addr,
93 sdata->sensor_settings->odr.mask,
97 sdata->odr = odr_out.hz;
99 st_sensors_match_odr_error:
102 EXPORT_SYMBOL(st_sensors_set_odr);
104 static int st_sensors_match_fs(struct st_sensor_settings *sensor_settings,
105 unsigned int fs, int *index_fs_avl)
107 int i, ret = -EINVAL;
109 for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
110 if (sensor_settings->fs.fs_avl[i].num == 0)
111 goto st_sensors_match_odr_error;
113 if (sensor_settings->fs.fs_avl[i].num == fs) {
120 st_sensors_match_odr_error:
124 static int st_sensors_set_fullscale(struct iio_dev *indio_dev, unsigned int fs)
127 struct st_sensor_data *sdata = iio_priv(indio_dev);
129 err = st_sensors_match_fs(sdata->sensor_settings, fs, &i);
131 goto st_accel_set_fullscale_error;
133 err = st_sensors_write_data_with_mask(indio_dev,
134 sdata->sensor_settings->fs.addr,
135 sdata->sensor_settings->fs.mask,
136 sdata->sensor_settings->fs.fs_avl[i].value);
138 goto st_accel_set_fullscale_error;
140 sdata->current_fullscale = (struct st_sensor_fullscale_avl *)
141 &sdata->sensor_settings->fs.fs_avl[i];
144 st_accel_set_fullscale_error:
145 dev_err(&indio_dev->dev, "failed to set new fullscale.\n");
149 int st_sensors_set_enable(struct iio_dev *indio_dev, bool enable)
154 struct st_sensor_odr_avl odr_out = {0, 0};
155 struct st_sensor_data *sdata = iio_priv(indio_dev);
158 tmp_value = sdata->sensor_settings->pw.value_on;
159 if ((sdata->sensor_settings->odr.addr ==
160 sdata->sensor_settings->pw.addr) &&
161 (sdata->sensor_settings->odr.mask ==
162 sdata->sensor_settings->pw.mask)) {
163 err = st_sensors_match_odr(sdata->sensor_settings,
164 sdata->odr, &odr_out);
166 goto set_enable_error;
167 tmp_value = odr_out.value;
170 err = st_sensors_write_data_with_mask(indio_dev,
171 sdata->sensor_settings->pw.addr,
172 sdata->sensor_settings->pw.mask, tmp_value);
174 goto set_enable_error;
176 sdata->enabled = true;
179 sdata->odr = odr_out.hz;
181 err = st_sensors_write_data_with_mask(indio_dev,
182 sdata->sensor_settings->pw.addr,
183 sdata->sensor_settings->pw.mask,
184 sdata->sensor_settings->pw.value_off);
186 goto set_enable_error;
188 sdata->enabled = false;
194 EXPORT_SYMBOL(st_sensors_set_enable);
196 int st_sensors_set_axis_enable(struct iio_dev *indio_dev, u8 axis_enable)
198 struct st_sensor_data *sdata = iio_priv(indio_dev);
200 return st_sensors_write_data_with_mask(indio_dev,
201 sdata->sensor_settings->enable_axis.addr,
202 sdata->sensor_settings->enable_axis.mask,
205 EXPORT_SYMBOL(st_sensors_set_axis_enable);
207 void st_sensors_power_enable(struct iio_dev *indio_dev)
209 struct st_sensor_data *pdata = iio_priv(indio_dev);
212 /* Regulators not mandatory, but if requested we should enable them. */
213 pdata->vdd = devm_regulator_get_optional(indio_dev->dev.parent, "vdd");
214 if (!IS_ERR(pdata->vdd)) {
215 err = regulator_enable(pdata->vdd);
217 dev_warn(&indio_dev->dev,
218 "Failed to enable specified Vdd supply\n");
221 pdata->vdd_io = devm_regulator_get_optional(indio_dev->dev.parent, "vddio");
222 if (!IS_ERR(pdata->vdd_io)) {
223 err = regulator_enable(pdata->vdd_io);
225 dev_warn(&indio_dev->dev,
226 "Failed to enable specified Vdd_IO supply\n");
229 EXPORT_SYMBOL(st_sensors_power_enable);
231 void st_sensors_power_disable(struct iio_dev *indio_dev)
233 struct st_sensor_data *pdata = iio_priv(indio_dev);
235 if (!IS_ERR(pdata->vdd))
236 regulator_disable(pdata->vdd);
238 if (!IS_ERR(pdata->vdd_io))
239 regulator_disable(pdata->vdd_io);
241 EXPORT_SYMBOL(st_sensors_power_disable);
243 static int st_sensors_set_drdy_int_pin(struct iio_dev *indio_dev,
244 struct st_sensors_platform_data *pdata)
246 struct st_sensor_data *sdata = iio_priv(indio_dev);
248 switch (pdata->drdy_int_pin) {
250 if (sdata->sensor_settings->drdy_irq.mask_int1 == 0) {
251 dev_err(&indio_dev->dev,
252 "DRDY on INT1 not available.\n");
255 sdata->drdy_int_pin = 1;
258 if (sdata->sensor_settings->drdy_irq.mask_int2 == 0) {
259 dev_err(&indio_dev->dev,
260 "DRDY on INT2 not available.\n");
263 sdata->drdy_int_pin = 2;
266 dev_err(&indio_dev->dev, "DRDY on pdata not valid.\n");
274 static struct st_sensors_platform_data *st_sensors_of_probe(struct device *dev,
275 struct st_sensors_platform_data *defdata)
277 struct st_sensors_platform_data *pdata;
278 struct device_node *np = dev->of_node;
284 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
285 if (!of_property_read_u32(np, "st,drdy-int-pin", &val) && (val <= 2))
286 pdata->drdy_int_pin = (u8) val;
288 pdata->drdy_int_pin = defdata ? defdata->drdy_int_pin : 1;
293 static struct st_sensors_platform_data *st_sensors_of_probe(struct device *dev,
294 struct st_sensors_platform_data *defdata)
300 int st_sensors_init_sensor(struct iio_dev *indio_dev,
301 struct st_sensors_platform_data *pdata)
303 struct st_sensor_data *sdata = iio_priv(indio_dev);
304 struct st_sensors_platform_data *of_pdata;
307 mutex_init(&sdata->tb.buf_lock);
309 /* If OF/DT pdata exists, it will take precedence of anything else */
310 of_pdata = st_sensors_of_probe(indio_dev->dev.parent, pdata);
315 err = st_sensors_set_drdy_int_pin(indio_dev, pdata);
320 err = st_sensors_set_enable(indio_dev, false);
324 if (sdata->current_fullscale) {
325 err = st_sensors_set_fullscale(indio_dev,
326 sdata->current_fullscale->num);
330 dev_info(&indio_dev->dev, "Full-scale not possible\n");
332 err = st_sensors_set_odr(indio_dev, sdata->odr);
337 err = st_sensors_write_data_with_mask(indio_dev,
338 sdata->sensor_settings->bdu.addr,
339 sdata->sensor_settings->bdu.mask, true);
343 err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
347 EXPORT_SYMBOL(st_sensors_init_sensor);
349 int st_sensors_set_dataready_irq(struct iio_dev *indio_dev, bool enable)
353 struct st_sensor_data *sdata = iio_priv(indio_dev);
355 if (!sdata->sensor_settings->drdy_irq.addr)
358 /* Enable/Disable the interrupt generator 1. */
359 if (sdata->sensor_settings->drdy_irq.ig1.en_addr > 0) {
360 err = st_sensors_write_data_with_mask(indio_dev,
361 sdata->sensor_settings->drdy_irq.ig1.en_addr,
362 sdata->sensor_settings->drdy_irq.ig1.en_mask,
365 goto st_accel_set_dataready_irq_error;
368 if (sdata->drdy_int_pin == 1)
369 drdy_mask = sdata->sensor_settings->drdy_irq.mask_int1;
371 drdy_mask = sdata->sensor_settings->drdy_irq.mask_int2;
373 /* Enable/Disable the interrupt generator for data ready. */
374 err = st_sensors_write_data_with_mask(indio_dev,
375 sdata->sensor_settings->drdy_irq.addr,
376 drdy_mask, (int)enable);
378 st_accel_set_dataready_irq_error:
381 EXPORT_SYMBOL(st_sensors_set_dataready_irq);
383 int st_sensors_set_fullscale_by_gain(struct iio_dev *indio_dev, int scale)
385 int err = -EINVAL, i;
386 struct st_sensor_data *sdata = iio_priv(indio_dev);
388 for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
389 if ((sdata->sensor_settings->fs.fs_avl[i].gain == scale) &&
390 (sdata->sensor_settings->fs.fs_avl[i].gain != 0)) {
396 goto st_sensors_match_scale_error;
398 err = st_sensors_set_fullscale(indio_dev,
399 sdata->sensor_settings->fs.fs_avl[i].num);
401 st_sensors_match_scale_error:
404 EXPORT_SYMBOL(st_sensors_set_fullscale_by_gain);
406 static int st_sensors_read_axis_data(struct iio_dev *indio_dev,
407 struct iio_chan_spec const *ch, int *data)
411 struct st_sensor_data *sdata = iio_priv(indio_dev);
412 unsigned int byte_for_channel = ch->scan_type.storagebits >> 3;
414 outdata = kmalloc(byte_for_channel, GFP_KERNEL);
418 err = sdata->tf->read_multiple_byte(&sdata->tb, sdata->dev,
419 ch->address, byte_for_channel,
420 outdata, sdata->multiread_bit);
422 goto st_sensors_free_memory;
424 if (byte_for_channel == 2)
425 *data = (s16)get_unaligned_le16(outdata);
426 else if (byte_for_channel == 3)
427 *data = (s32)st_sensors_get_unaligned_le24(outdata);
429 st_sensors_free_memory:
435 int st_sensors_read_info_raw(struct iio_dev *indio_dev,
436 struct iio_chan_spec const *ch, int *val)
439 struct st_sensor_data *sdata = iio_priv(indio_dev);
441 mutex_lock(&indio_dev->mlock);
442 if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) {
446 err = st_sensors_set_enable(indio_dev, true);
450 msleep((sdata->sensor_settings->bootime * 1000) / sdata->odr);
451 err = st_sensors_read_axis_data(indio_dev, ch, val);
455 *val = *val >> ch->scan_type.shift;
457 err = st_sensors_set_enable(indio_dev, false);
460 mutex_unlock(&indio_dev->mlock);
464 EXPORT_SYMBOL(st_sensors_read_info_raw);
466 int st_sensors_check_device_support(struct iio_dev *indio_dev,
467 int num_sensors_list,
468 const struct st_sensor_settings *sensor_settings)
472 struct st_sensor_data *sdata = iio_priv(indio_dev);
474 err = sdata->tf->read_byte(&sdata->tb, sdata->dev,
475 ST_SENSORS_DEFAULT_WAI_ADDRESS, &wai);
477 dev_err(&indio_dev->dev, "failed to read Who-Am-I register.\n");
481 for (i = 0; i < num_sensors_list; i++) {
482 if (sensor_settings[i].wai == wai)
485 if (i == num_sensors_list)
486 goto device_not_supported;
488 for (n = 0; n < ARRAY_SIZE(sensor_settings[i].sensors_supported); n++) {
489 if (strcmp(indio_dev->name,
490 &sensor_settings[i].sensors_supported[n][0]) == 0)
493 if (n == ARRAY_SIZE(sensor_settings[i].sensors_supported)) {
494 dev_err(&indio_dev->dev, "device name and WhoAmI mismatch.\n");
495 goto sensor_name_mismatch;
498 sdata->sensor_settings =
499 (struct st_sensor_settings *)&sensor_settings[i];
503 device_not_supported:
504 dev_err(&indio_dev->dev, "device not supported: WhoAmI (0x%x).\n", wai);
505 sensor_name_mismatch:
510 EXPORT_SYMBOL(st_sensors_check_device_support);
512 ssize_t st_sensors_sysfs_sampling_frequency_avail(struct device *dev,
513 struct device_attribute *attr, char *buf)
516 struct iio_dev *indio_dev = dev_get_drvdata(dev);
517 struct st_sensor_data *sdata = iio_priv(indio_dev);
519 mutex_lock(&indio_dev->mlock);
520 for (i = 0; i < ST_SENSORS_ODR_LIST_MAX; i++) {
521 if (sdata->sensor_settings->odr.odr_avl[i].hz == 0)
524 len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
525 sdata->sensor_settings->odr.odr_avl[i].hz);
527 mutex_unlock(&indio_dev->mlock);
532 EXPORT_SYMBOL(st_sensors_sysfs_sampling_frequency_avail);
534 ssize_t st_sensors_sysfs_scale_avail(struct device *dev,
535 struct device_attribute *attr, char *buf)
538 struct iio_dev *indio_dev = dev_get_drvdata(dev);
539 struct st_sensor_data *sdata = iio_priv(indio_dev);
541 mutex_lock(&indio_dev->mlock);
542 for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
543 if (sdata->sensor_settings->fs.fs_avl[i].num == 0)
546 len += scnprintf(buf + len, PAGE_SIZE - len, "0.%06u ",
547 sdata->sensor_settings->fs.fs_avl[i].gain);
549 mutex_unlock(&indio_dev->mlock);
554 EXPORT_SYMBOL(st_sensors_sysfs_scale_avail);
556 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
557 MODULE_DESCRIPTION("STMicroelectronics ST-sensors core");
558 MODULE_LICENSE("GPL v2");