2 * STMicroelectronics pressures driver
4 * Copyright 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/errno.h>
15 #include <linux/types.h>
16 #include <linux/mutex.h>
17 #include <linux/interrupt.h>
18 #include <linux/i2c.h>
19 #include <linux/gpio.h>
20 #include <linux/irq.h>
21 #include <linux/delay.h>
22 #include <linux/iio/iio.h>
23 #include <linux/iio/sysfs.h>
24 #include <linux/iio/trigger.h>
25 #include <linux/iio/buffer.h>
26 #include <asm/unaligned.h>
28 #include <linux/iio/common/st_sensors.h>
29 #include "st_pressure.h"
32 * About determining pressure scaling factors
33 * ------------------------------------------
35 * Datasheets specify typical pressure sensitivity so that pressure is computed
36 * according to the following equation :
37 * pressure[mBar] = raw / sensitivity
39 * raw the 24 bits long raw sampled pressure
40 * sensitivity a scaling factor specified by the datasheet in LSB/mBar
42 * IIO ABI expects pressure to be expressed as kPascal, hence pressure should be
43 * computed according to :
44 * pressure[kPascal] = pressure[mBar] / 10
45 * = raw / (sensitivity * 10) (1)
47 * Finally, st_press_read_raw() returns pressure scaling factor as an
48 * IIO_VAL_INT_PLUS_NANO with a zero integral part and "gain" as decimal part.
49 * Therefore, from (1), "gain" becomes :
50 * gain = 10^9 / (sensitivity * 10)
51 * = 10^8 / sensitivity
53 * About determining temperature scaling factors and offsets
54 * ---------------------------------------------------------
56 * Datasheets specify typical temperature sensitivity and offset so that
57 * temperature is computed according to the following equation :
58 * temp[Celsius] = offset[Celsius] + (raw / sensitivity)
60 * raw the 16 bits long raw sampled temperature
61 * offset a constant specified by the datasheet in degree Celsius
63 * sensitivity a scaling factor specified by the datasheet in LSB/Celsius
65 * IIO ABI expects temperature to be expressed as milli degree Celsius such as
66 * user space should compute temperature according to :
67 * temp[mCelsius] = temp[Celsius] * 10^3
68 * = (offset[Celsius] + (raw / sensitivity)) * 10^3
69 * = ((offset[Celsius] * sensitivity) + raw) *
70 * (10^3 / sensitivity) (2)
72 * IIO ABI expects user space to apply offset and scaling factors to raw samples
74 * temp[mCelsius] = (OFFSET + raw) * SCALE
76 * OFFSET an arbitrary constant exposed by device
77 * SCALE an arbitrary scaling factor exposed by device
79 * Matching OFFSET and SCALE with members of (2) gives :
80 * OFFSET = offset[Celsius] * sensitivity (3)
81 * SCALE = 10^3 / sensitivity (4)
83 * st_press_read_raw() returns temperature scaling factor as an
84 * IIO_VAL_FRACTIONAL with a 10^3 numerator and "gain2" as denominator.
85 * Therefore, from (3), "gain2" becomes :
88 * When declared within channel, i.e. for a non zero specified offset,
89 * st_press_read_raw() will return the latter as an IIO_VAL_FRACTIONAL such as :
90 * numerator = OFFSET * 10^3
93 * numerator = offset[Celsius] * 10^3 * sensitivity
94 * = offset[mCelsius] * gain2
97 #define MCELSIUS_PER_CELSIUS 1000
99 /* Default pressure sensitivity */
100 #define ST_PRESS_LSB_PER_MBAR 4096UL
101 #define ST_PRESS_KPASCAL_NANO_SCALE (100000000UL / \
102 ST_PRESS_LSB_PER_MBAR)
104 /* Default temperature sensitivity */
105 #define ST_PRESS_LSB_PER_CELSIUS 480UL
106 #define ST_PRESS_MILLI_CELSIUS_OFFSET 42500UL
109 #define ST_PRESS_FS_AVL_1100MB 1100
110 #define ST_PRESS_FS_AVL_1260MB 1260
112 #define ST_PRESS_1_OUT_XL_ADDR 0x28
113 #define ST_TEMP_1_OUT_L_ADDR 0x2b
116 * CUSTOM VALUES FOR LPS331AP SENSOR
117 * See LPS331AP datasheet:
118 * http://www2.st.com/resource/en/datasheet/lps331ap.pdf
120 #define ST_PRESS_LPS331AP_WAI_EXP 0xbb
121 #define ST_PRESS_LPS331AP_ODR_ADDR 0x20
122 #define ST_PRESS_LPS331AP_ODR_MASK 0x70
123 #define ST_PRESS_LPS331AP_ODR_AVL_1HZ_VAL 0x01
124 #define ST_PRESS_LPS331AP_ODR_AVL_7HZ_VAL 0x05
125 #define ST_PRESS_LPS331AP_ODR_AVL_13HZ_VAL 0x06
126 #define ST_PRESS_LPS331AP_ODR_AVL_25HZ_VAL 0x07
127 #define ST_PRESS_LPS331AP_PW_ADDR 0x20
128 #define ST_PRESS_LPS331AP_PW_MASK 0x80
129 #define ST_PRESS_LPS331AP_FS_ADDR 0x23
130 #define ST_PRESS_LPS331AP_FS_MASK 0x30
131 #define ST_PRESS_LPS331AP_BDU_ADDR 0x20
132 #define ST_PRESS_LPS331AP_BDU_MASK 0x04
133 #define ST_PRESS_LPS331AP_DRDY_IRQ_ADDR 0x22
134 #define ST_PRESS_LPS331AP_DRDY_IRQ_INT1_MASK 0x04
135 #define ST_PRESS_LPS331AP_DRDY_IRQ_INT2_MASK 0x20
136 #define ST_PRESS_LPS331AP_IHL_IRQ_ADDR 0x22
137 #define ST_PRESS_LPS331AP_IHL_IRQ_MASK 0x80
138 #define ST_PRESS_LPS331AP_OD_IRQ_ADDR 0x22
139 #define ST_PRESS_LPS331AP_OD_IRQ_MASK 0x40
140 #define ST_PRESS_LPS331AP_MULTIREAD_BIT true
143 * CUSTOM VALUES FOR THE OBSOLETE LPS001WP SENSOR
146 /* LPS001WP pressure resolution */
147 #define ST_PRESS_LPS001WP_LSB_PER_MBAR 16UL
148 /* LPS001WP temperature resolution */
149 #define ST_PRESS_LPS001WP_LSB_PER_CELSIUS 64UL
151 #define ST_PRESS_LPS001WP_WAI_EXP 0xba
152 #define ST_PRESS_LPS001WP_ODR_ADDR 0x20
153 #define ST_PRESS_LPS001WP_ODR_MASK 0x30
154 #define ST_PRESS_LPS001WP_ODR_AVL_1HZ_VAL 0x01
155 #define ST_PRESS_LPS001WP_ODR_AVL_7HZ_VAL 0x02
156 #define ST_PRESS_LPS001WP_ODR_AVL_13HZ_VAL 0x03
157 #define ST_PRESS_LPS001WP_PW_ADDR 0x20
158 #define ST_PRESS_LPS001WP_PW_MASK 0x40
159 #define ST_PRESS_LPS001WP_FS_AVL_PRESS_GAIN \
160 (100000000UL / ST_PRESS_LPS001WP_LSB_PER_MBAR)
161 #define ST_PRESS_LPS001WP_BDU_ADDR 0x20
162 #define ST_PRESS_LPS001WP_BDU_MASK 0x04
163 #define ST_PRESS_LPS001WP_MULTIREAD_BIT true
164 #define ST_PRESS_LPS001WP_OUT_L_ADDR 0x28
165 #define ST_TEMP_LPS001WP_OUT_L_ADDR 0x2a
168 * CUSTOM VALUES FOR LPS25H SENSOR
169 * See LPS25H datasheet:
170 * http://www2.st.com/resource/en/datasheet/lps25h.pdf
172 #define ST_PRESS_LPS25H_WAI_EXP 0xbd
173 #define ST_PRESS_LPS25H_ODR_ADDR 0x20
174 #define ST_PRESS_LPS25H_ODR_MASK 0x70
175 #define ST_PRESS_LPS25H_ODR_AVL_1HZ_VAL 0x01
176 #define ST_PRESS_LPS25H_ODR_AVL_7HZ_VAL 0x02
177 #define ST_PRESS_LPS25H_ODR_AVL_13HZ_VAL 0x03
178 #define ST_PRESS_LPS25H_ODR_AVL_25HZ_VAL 0x04
179 #define ST_PRESS_LPS25H_PW_ADDR 0x20
180 #define ST_PRESS_LPS25H_PW_MASK 0x80
181 #define ST_PRESS_LPS25H_BDU_ADDR 0x20
182 #define ST_PRESS_LPS25H_BDU_MASK 0x04
183 #define ST_PRESS_LPS25H_DRDY_IRQ_ADDR 0x23
184 #define ST_PRESS_LPS25H_DRDY_IRQ_INT1_MASK 0x01
185 #define ST_PRESS_LPS25H_DRDY_IRQ_INT2_MASK 0x10
186 #define ST_PRESS_LPS25H_IHL_IRQ_ADDR 0x22
187 #define ST_PRESS_LPS25H_IHL_IRQ_MASK 0x80
188 #define ST_PRESS_LPS25H_OD_IRQ_ADDR 0x22
189 #define ST_PRESS_LPS25H_OD_IRQ_MASK 0x40
190 #define ST_PRESS_LPS25H_MULTIREAD_BIT true
191 #define ST_PRESS_LPS25H_OUT_XL_ADDR 0x28
192 #define ST_TEMP_LPS25H_OUT_L_ADDR 0x2b
195 * CUSTOM VALUES FOR LPS22HB SENSOR
196 * See LPS22HB datasheet:
197 * http://www2.st.com/resource/en/datasheet/lps22hb.pdf
200 /* LPS22HB temperature sensitivity */
201 #define ST_PRESS_LPS22HB_LSB_PER_CELSIUS 100UL
203 #define ST_PRESS_LPS22HB_WAI_EXP 0xb1
204 #define ST_PRESS_LPS22HB_ODR_ADDR 0x10
205 #define ST_PRESS_LPS22HB_ODR_MASK 0x70
206 #define ST_PRESS_LPS22HB_ODR_AVL_1HZ_VAL 0x01
207 #define ST_PRESS_LPS22HB_ODR_AVL_10HZ_VAL 0x02
208 #define ST_PRESS_LPS22HB_ODR_AVL_25HZ_VAL 0x03
209 #define ST_PRESS_LPS22HB_ODR_AVL_50HZ_VAL 0x04
210 #define ST_PRESS_LPS22HB_ODR_AVL_75HZ_VAL 0x05
211 #define ST_PRESS_LPS22HB_PW_ADDR 0x10
212 #define ST_PRESS_LPS22HB_PW_MASK 0x70
213 #define ST_PRESS_LPS22HB_BDU_ADDR 0x10
214 #define ST_PRESS_LPS22HB_BDU_MASK 0x02
215 #define ST_PRESS_LPS22HB_DRDY_IRQ_ADDR 0x12
216 #define ST_PRESS_LPS22HB_DRDY_IRQ_INT1_MASK 0x04
217 #define ST_PRESS_LPS22HB_DRDY_IRQ_INT2_MASK 0x08
218 #define ST_PRESS_LPS22HB_IHL_IRQ_ADDR 0x12
219 #define ST_PRESS_LPS22HB_IHL_IRQ_MASK 0x80
220 #define ST_PRESS_LPS22HB_OD_IRQ_ADDR 0x12
221 #define ST_PRESS_LPS22HB_OD_IRQ_MASK 0x40
222 #define ST_PRESS_LPS22HB_MULTIREAD_BIT true
224 static const struct iio_chan_spec st_press_1_channels[] = {
226 .type = IIO_PRESSURE,
227 .address = ST_PRESS_1_OUT_XL_ADDR,
233 .endianness = IIO_LE,
235 .info_mask_separate =
236 BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
240 .address = ST_TEMP_1_OUT_L_ADDR,
246 .endianness = IIO_LE,
248 .info_mask_separate =
249 BIT(IIO_CHAN_INFO_RAW) |
250 BIT(IIO_CHAN_INFO_SCALE) |
251 BIT(IIO_CHAN_INFO_OFFSET),
253 IIO_CHAN_SOFT_TIMESTAMP(2)
256 static const struct iio_chan_spec st_press_lps001wp_channels[] = {
258 .type = IIO_PRESSURE,
259 .address = ST_PRESS_LPS001WP_OUT_L_ADDR,
265 .endianness = IIO_LE,
267 .info_mask_separate =
268 BIT(IIO_CHAN_INFO_RAW) |
269 BIT(IIO_CHAN_INFO_SCALE),
273 .address = ST_TEMP_LPS001WP_OUT_L_ADDR,
279 .endianness = IIO_LE,
281 .info_mask_separate =
282 BIT(IIO_CHAN_INFO_RAW) |
283 BIT(IIO_CHAN_INFO_SCALE),
285 IIO_CHAN_SOFT_TIMESTAMP(2)
288 static const struct iio_chan_spec st_press_lps22hb_channels[] = {
290 .type = IIO_PRESSURE,
291 .address = ST_PRESS_1_OUT_XL_ADDR,
297 .endianness = IIO_LE,
299 .info_mask_separate =
300 BIT(IIO_CHAN_INFO_RAW) |
301 BIT(IIO_CHAN_INFO_SCALE),
302 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
306 .address = ST_TEMP_1_OUT_L_ADDR,
312 .endianness = IIO_LE,
314 .info_mask_separate =
315 BIT(IIO_CHAN_INFO_RAW) |
316 BIT(IIO_CHAN_INFO_SCALE),
317 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
319 IIO_CHAN_SOFT_TIMESTAMP(2)
322 static const struct st_sensor_settings st_press_sensors_settings[] = {
324 .wai = ST_PRESS_LPS331AP_WAI_EXP,
325 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
326 .sensors_supported = {
327 [0] = LPS331AP_PRESS_DEV_NAME,
329 .ch = (struct iio_chan_spec *)st_press_1_channels,
330 .num_ch = ARRAY_SIZE(st_press_1_channels),
332 .addr = ST_PRESS_LPS331AP_ODR_ADDR,
333 .mask = ST_PRESS_LPS331AP_ODR_MASK,
335 { 1, ST_PRESS_LPS331AP_ODR_AVL_1HZ_VAL, },
336 { 7, ST_PRESS_LPS331AP_ODR_AVL_7HZ_VAL, },
337 { 13, ST_PRESS_LPS331AP_ODR_AVL_13HZ_VAL, },
338 { 25, ST_PRESS_LPS331AP_ODR_AVL_25HZ_VAL, },
342 .addr = ST_PRESS_LPS331AP_PW_ADDR,
343 .mask = ST_PRESS_LPS331AP_PW_MASK,
344 .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
345 .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
348 .addr = ST_PRESS_LPS331AP_FS_ADDR,
349 .mask = ST_PRESS_LPS331AP_FS_MASK,
352 * Pressure and temperature sensitivity values
353 * as defined in table 3 of LPS331AP datasheet.
356 .num = ST_PRESS_FS_AVL_1260MB,
357 .gain = ST_PRESS_KPASCAL_NANO_SCALE,
358 .gain2 = ST_PRESS_LSB_PER_CELSIUS,
363 .addr = ST_PRESS_LPS331AP_BDU_ADDR,
364 .mask = ST_PRESS_LPS331AP_BDU_MASK,
367 .addr = ST_PRESS_LPS331AP_DRDY_IRQ_ADDR,
368 .mask_int1 = ST_PRESS_LPS331AP_DRDY_IRQ_INT1_MASK,
369 .mask_int2 = ST_PRESS_LPS331AP_DRDY_IRQ_INT2_MASK,
370 .addr_ihl = ST_PRESS_LPS331AP_IHL_IRQ_ADDR,
371 .mask_ihl = ST_PRESS_LPS331AP_IHL_IRQ_MASK,
372 .addr_od = ST_PRESS_LPS331AP_OD_IRQ_ADDR,
373 .mask_od = ST_PRESS_LPS331AP_OD_IRQ_MASK,
374 .addr_stat_drdy = ST_SENSORS_DEFAULT_STAT_ADDR,
376 .multi_read_bit = ST_PRESS_LPS331AP_MULTIREAD_BIT,
380 .wai = ST_PRESS_LPS001WP_WAI_EXP,
381 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
382 .sensors_supported = {
383 [0] = LPS001WP_PRESS_DEV_NAME,
385 .ch = (struct iio_chan_spec *)st_press_lps001wp_channels,
386 .num_ch = ARRAY_SIZE(st_press_lps001wp_channels),
388 .addr = ST_PRESS_LPS001WP_ODR_ADDR,
389 .mask = ST_PRESS_LPS001WP_ODR_MASK,
391 { 1, ST_PRESS_LPS001WP_ODR_AVL_1HZ_VAL, },
392 { 7, ST_PRESS_LPS001WP_ODR_AVL_7HZ_VAL, },
393 { 13, ST_PRESS_LPS001WP_ODR_AVL_13HZ_VAL, },
397 .addr = ST_PRESS_LPS001WP_PW_ADDR,
398 .mask = ST_PRESS_LPS001WP_PW_MASK,
399 .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
400 .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
405 * Pressure and temperature resolution values
406 * as defined in table 3 of LPS001WP datasheet.
409 .num = ST_PRESS_FS_AVL_1100MB,
410 .gain = ST_PRESS_LPS001WP_FS_AVL_PRESS_GAIN,
411 .gain2 = ST_PRESS_LPS001WP_LSB_PER_CELSIUS,
416 .addr = ST_PRESS_LPS001WP_BDU_ADDR,
417 .mask = ST_PRESS_LPS001WP_BDU_MASK,
422 .multi_read_bit = ST_PRESS_LPS001WP_MULTIREAD_BIT,
426 .wai = ST_PRESS_LPS25H_WAI_EXP,
427 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
428 .sensors_supported = {
429 [0] = LPS25H_PRESS_DEV_NAME,
431 .ch = (struct iio_chan_spec *)st_press_1_channels,
432 .num_ch = ARRAY_SIZE(st_press_1_channels),
434 .addr = ST_PRESS_LPS25H_ODR_ADDR,
435 .mask = ST_PRESS_LPS25H_ODR_MASK,
437 { 1, ST_PRESS_LPS25H_ODR_AVL_1HZ_VAL, },
438 { 7, ST_PRESS_LPS25H_ODR_AVL_7HZ_VAL, },
439 { 13, ST_PRESS_LPS25H_ODR_AVL_13HZ_VAL, },
440 { 25, ST_PRESS_LPS25H_ODR_AVL_25HZ_VAL, },
444 .addr = ST_PRESS_LPS25H_PW_ADDR,
445 .mask = ST_PRESS_LPS25H_PW_MASK,
446 .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
447 .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
452 * Pressure and temperature sensitivity values
453 * as defined in table 3 of LPS25H datasheet.
456 .num = ST_PRESS_FS_AVL_1260MB,
457 .gain = ST_PRESS_KPASCAL_NANO_SCALE,
458 .gain2 = ST_PRESS_LSB_PER_CELSIUS,
463 .addr = ST_PRESS_LPS25H_BDU_ADDR,
464 .mask = ST_PRESS_LPS25H_BDU_MASK,
467 .addr = ST_PRESS_LPS25H_DRDY_IRQ_ADDR,
468 .mask_int1 = ST_PRESS_LPS25H_DRDY_IRQ_INT1_MASK,
469 .mask_int2 = ST_PRESS_LPS25H_DRDY_IRQ_INT2_MASK,
470 .addr_ihl = ST_PRESS_LPS25H_IHL_IRQ_ADDR,
471 .mask_ihl = ST_PRESS_LPS25H_IHL_IRQ_MASK,
472 .addr_od = ST_PRESS_LPS25H_OD_IRQ_ADDR,
473 .mask_od = ST_PRESS_LPS25H_OD_IRQ_MASK,
474 .addr_stat_drdy = ST_SENSORS_DEFAULT_STAT_ADDR,
476 .multi_read_bit = ST_PRESS_LPS25H_MULTIREAD_BIT,
480 .wai = ST_PRESS_LPS22HB_WAI_EXP,
481 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
482 .sensors_supported = {
483 [0] = LPS22HB_PRESS_DEV_NAME,
485 .ch = (struct iio_chan_spec *)st_press_lps22hb_channels,
486 .num_ch = ARRAY_SIZE(st_press_lps22hb_channels),
488 .addr = ST_PRESS_LPS22HB_ODR_ADDR,
489 .mask = ST_PRESS_LPS22HB_ODR_MASK,
491 { 1, ST_PRESS_LPS22HB_ODR_AVL_1HZ_VAL, },
492 { 10, ST_PRESS_LPS22HB_ODR_AVL_10HZ_VAL, },
493 { 25, ST_PRESS_LPS22HB_ODR_AVL_25HZ_VAL, },
494 { 50, ST_PRESS_LPS22HB_ODR_AVL_50HZ_VAL, },
495 { 75, ST_PRESS_LPS22HB_ODR_AVL_75HZ_VAL, },
499 .addr = ST_PRESS_LPS22HB_PW_ADDR,
500 .mask = ST_PRESS_LPS22HB_PW_MASK,
501 .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
506 * Pressure and temperature sensitivity values
507 * as defined in table 3 of LPS22HB datasheet.
510 .num = ST_PRESS_FS_AVL_1260MB,
511 .gain = ST_PRESS_KPASCAL_NANO_SCALE,
512 .gain2 = ST_PRESS_LPS22HB_LSB_PER_CELSIUS,
517 .addr = ST_PRESS_LPS22HB_BDU_ADDR,
518 .mask = ST_PRESS_LPS22HB_BDU_MASK,
521 .addr = ST_PRESS_LPS22HB_DRDY_IRQ_ADDR,
522 .mask_int1 = ST_PRESS_LPS22HB_DRDY_IRQ_INT1_MASK,
523 .mask_int2 = ST_PRESS_LPS22HB_DRDY_IRQ_INT2_MASK,
524 .addr_ihl = ST_PRESS_LPS22HB_IHL_IRQ_ADDR,
525 .mask_ihl = ST_PRESS_LPS22HB_IHL_IRQ_MASK,
526 .addr_od = ST_PRESS_LPS22HB_OD_IRQ_ADDR,
527 .mask_od = ST_PRESS_LPS22HB_OD_IRQ_MASK,
528 .addr_stat_drdy = ST_SENSORS_DEFAULT_STAT_ADDR,
530 .multi_read_bit = ST_PRESS_LPS22HB_MULTIREAD_BIT,
534 static int st_press_write_raw(struct iio_dev *indio_dev,
535 struct iio_chan_spec const *ch,
543 case IIO_CHAN_INFO_SAMP_FREQ:
546 mutex_lock(&indio_dev->mlock);
547 err = st_sensors_set_odr(indio_dev, val);
548 mutex_unlock(&indio_dev->mlock);
555 static int st_press_read_raw(struct iio_dev *indio_dev,
556 struct iio_chan_spec const *ch, int *val,
557 int *val2, long mask)
560 struct st_sensor_data *press_data = iio_priv(indio_dev);
563 case IIO_CHAN_INFO_RAW:
564 err = st_sensors_read_info_raw(indio_dev, ch, val);
569 case IIO_CHAN_INFO_SCALE:
573 *val2 = press_data->current_fullscale->gain;
574 return IIO_VAL_INT_PLUS_NANO;
576 *val = MCELSIUS_PER_CELSIUS;
577 *val2 = press_data->current_fullscale->gain2;
578 return IIO_VAL_FRACTIONAL;
584 case IIO_CHAN_INFO_OFFSET:
587 *val = ST_PRESS_MILLI_CELSIUS_OFFSET *
588 press_data->current_fullscale->gain2;
589 *val2 = MCELSIUS_PER_CELSIUS;
596 return IIO_VAL_FRACTIONAL;
597 case IIO_CHAN_INFO_SAMP_FREQ:
598 *val = press_data->odr;
608 static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();
610 static struct attribute *st_press_attributes[] = {
611 &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
615 static const struct attribute_group st_press_attribute_group = {
616 .attrs = st_press_attributes,
619 static const struct iio_info press_info = {
620 .driver_module = THIS_MODULE,
621 .attrs = &st_press_attribute_group,
622 .read_raw = &st_press_read_raw,
623 .write_raw = &st_press_write_raw,
624 .debugfs_reg_access = &st_sensors_debugfs_reg_access,
627 #ifdef CONFIG_IIO_TRIGGER
628 static const struct iio_trigger_ops st_press_trigger_ops = {
629 .owner = THIS_MODULE,
630 .set_trigger_state = ST_PRESS_TRIGGER_SET_STATE,
631 .validate_device = st_sensors_validate_device,
633 #define ST_PRESS_TRIGGER_OPS (&st_press_trigger_ops)
635 #define ST_PRESS_TRIGGER_OPS NULL
638 int st_press_common_probe(struct iio_dev *indio_dev)
640 struct st_sensor_data *press_data = iio_priv(indio_dev);
641 int irq = press_data->get_irq_data_ready(indio_dev);
644 indio_dev->modes = INDIO_DIRECT_MODE;
645 indio_dev->info = &press_info;
646 mutex_init(&press_data->tb.buf_lock);
648 err = st_sensors_power_enable(indio_dev);
652 err = st_sensors_check_device_support(indio_dev,
653 ARRAY_SIZE(st_press_sensors_settings),
654 st_press_sensors_settings);
656 goto st_press_power_off;
659 * Skip timestamping channel while declaring available channels to
660 * common st_sensor layer. Look at st_sensors_get_buffer_element() to
661 * see how timestamps are explicitly pushed as last samples block
664 press_data->num_data_channels = press_data->sensor_settings->num_ch - 1;
665 press_data->multiread_bit = press_data->sensor_settings->multi_read_bit;
666 indio_dev->channels = press_data->sensor_settings->ch;
667 indio_dev->num_channels = press_data->sensor_settings->num_ch;
669 press_data->current_fullscale =
670 (struct st_sensor_fullscale_avl *)
671 &press_data->sensor_settings->fs.fs_avl[0];
673 press_data->odr = press_data->sensor_settings->odr.odr_avl[0].hz;
675 /* Some devices don't support a data ready pin. */
676 if (!press_data->dev->platform_data &&
677 press_data->sensor_settings->drdy_irq.addr)
678 press_data->dev->platform_data =
679 (struct st_sensors_platform_data *)&default_press_pdata;
681 err = st_sensors_init_sensor(indio_dev, press_data->dev->platform_data);
683 goto st_press_power_off;
685 err = st_press_allocate_ring(indio_dev);
687 goto st_press_power_off;
690 err = st_sensors_allocate_trigger(indio_dev,
691 ST_PRESS_TRIGGER_OPS);
693 goto st_press_probe_trigger_error;
696 err = iio_device_register(indio_dev);
698 goto st_press_device_register_error;
700 dev_info(&indio_dev->dev, "registered pressure sensor %s\n",
705 st_press_device_register_error:
707 st_sensors_deallocate_trigger(indio_dev);
708 st_press_probe_trigger_error:
709 st_press_deallocate_ring(indio_dev);
711 st_sensors_power_disable(indio_dev);
715 EXPORT_SYMBOL(st_press_common_probe);
717 void st_press_common_remove(struct iio_dev *indio_dev)
719 struct st_sensor_data *press_data = iio_priv(indio_dev);
721 st_sensors_power_disable(indio_dev);
723 iio_device_unregister(indio_dev);
724 if (press_data->get_irq_data_ready(indio_dev) > 0)
725 st_sensors_deallocate_trigger(indio_dev);
727 st_press_deallocate_ring(indio_dev);
729 EXPORT_SYMBOL(st_press_common_remove);
731 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
732 MODULE_DESCRIPTION("STMicroelectronics pressures driver");
733 MODULE_LICENSE("GPL v2");