summaryrefslogtreecommitdiffstats
path: root/drivers/iio/pressure/bmp280.h
blob: 5812a344ed8e889c441e9b21fc623f98a2e23333 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
/* SPDX-License-Identifier: GPL-2.0 */
#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/iio/iio.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>


/* BMP580 specific registers */
#define BMP580_REG_CMD			0x7E
#define BMP580_REG_EFF_OSR		0x38
#define BMP580_REG_ODR_CONFIG		0x37
#define BMP580_REG_OSR_CONFIG		0x36
#define BMP580_REG_IF_CONFIG		0x13
#define BMP580_REG_REV_ID		0x02
#define BMP580_REG_CHIP_ID		0x01
/* OOR allows to configure a pressure alarm */
#define BMP580_REG_OOR_CONFIG		0x35
#define BMP580_REG_OOR_RANGE		0x34
#define BMP580_REG_OOR_THR_MSB		0x33
#define BMP580_REG_OOR_THR_LSB		0x32
/* DSP registers (IIR filters) */
#define BMP580_REG_DSP_IIR		0x31
#define BMP580_REG_DSP_CONFIG		0x30
/* NVM access registers */
#define BMP580_REG_NVM_DATA_MSB		0x2D
#define BMP580_REG_NVM_DATA_LSB		0x2C
#define BMP580_REG_NVM_ADDR		0x2B
/* Status registers */
#define BMP580_REG_STATUS		0x28
#define BMP580_REG_INT_STATUS		0x27
#define BMP580_REG_CHIP_STATUS		0x11
/* Data registers */
#define BMP580_REG_FIFO_DATA		0x29
#define BMP580_REG_PRESS_MSB		0x22
#define BMP580_REG_PRESS_LSB		0x21
#define BMP580_REG_PRESS_XLSB		0x20
#define BMP580_REG_TEMP_MSB		0x1F
#define BMP580_REG_TEMP_LSB		0x1E
#define BMP580_REG_TEMP_XLSB		0x1D
/* FIFO config registers */
#define BMP580_REG_FIFO_SEL		0x18
#define BMP580_REG_FIFO_COUNT		0x17
#define BMP580_REG_FIFO_CONFIG		0x16
/* Interruptions config registers */
#define BMP580_REG_INT_SOURCE		0x15
#define BMP580_REG_INT_CONFIG		0x14

#define BMP580_CMD_NOOP			0x00
#define BMP580_CMD_EXTMODE_SEQ_0	0x73
#define BMP580_CMD_EXTMODE_SEQ_1	0xB4
#define BMP580_CMD_EXTMODE_SEQ_2	0x69
#define BMP580_CMD_NVM_OP_SEQ_0		0x5D
#define BMP580_CMD_NVM_READ_SEQ_1	0xA5
#define BMP580_CMD_NVM_WRITE_SEQ_1	0xA0
#define BMP580_CMD_SOFT_RESET		0xB6

#define BMP580_INT_STATUS_POR_MASK	BIT(4)

#define BMP580_STATUS_CORE_RDY_MASK	BIT(0)
#define BMP580_STATUS_NVM_RDY_MASK	BIT(1)
#define BMP580_STATUS_NVM_ERR_MASK	BIT(2)
#define BMP580_STATUS_NVM_CMD_ERR_MASK	BIT(3)

#define BMP580_OSR_PRESS_MASK		GENMASK(5, 3)
#define BMP580_OSR_TEMP_MASK		GENMASK(2, 0)
#define BMP580_OSR_PRESS_EN		BIT(6)
#define BMP580_EFF_OSR_PRESS_MASK	GENMASK(5, 3)
#define BMP580_EFF_OSR_TEMP_MASK	GENMASK(2, 0)
#define BMP580_EFF_OSR_VALID_ODR	BIT(7)

#define BMP580_ODR_MASK			GENMASK(6, 2)
#define BMP580_MODE_MASK		GENMASK(1, 0)
#define BMP580_MODE_SLEEP		0
#define BMP580_MODE_NORMAL		1
#define BMP580_MODE_FORCED		2
#define BMP580_MODE_CONTINOUS		3
#define BMP580_ODR_DEEPSLEEP_DIS	BIT(7)

#define BMP580_DSP_COMP_MASK		GENMASK(1, 0)
#define BMP580_DSP_COMP_DIS		0
#define BMP580_DSP_TEMP_COMP_EN		1
/*
 * In section 7.27 of datasheet, modes 2 and 3 are technically the same.
 * Pressure compensation means also enabling temperature compensation
 */
#define BMP580_DSP_PRESS_COMP_EN	2
#define BMP580_DSP_PRESS_TEMP_COMP_EN	3
#define BMP580_DSP_IIR_FORCED_FLUSH	BIT(2)
#define BMP580_DSP_SHDW_IIR_TEMP_EN	BIT(3)
#define BMP580_DSP_FIFO_IIR_TEMP_EN	BIT(4)
#define BMP580_DSP_SHDW_IIR_PRESS_EN	BIT(5)
#define BMP580_DSP_FIFO_IIR_PRESS_EN	BIT(6)
#define BMP580_DSP_OOR_IIR_PRESS_EN	BIT(7)

#define BMP580_DSP_IIR_PRESS_MASK	GENMASK(5, 3)
#define BMP580_DSP_IIR_TEMP_MASK	GENMASK(2, 0)
#define BMP580_FILTER_OFF		0
#define BMP580_FILTER_1X		1
#define BMP580_FILTER_3X		2
#define BMP580_FILTER_7X		3
#define BMP580_FILTER_15X		4
#define BMP580_FILTER_31X		5
#define BMP580_FILTER_63X		6
#define BMP580_FILTER_127X		7

#define BMP580_NVM_ROW_ADDR_MASK	GENMASK(5, 0)
#define BMP580_NVM_PROG_EN		BIT(6)

#define BMP580_TEMP_SKIPPED		0x7f7f7f
#define BMP580_PRESS_SKIPPED		0x7f7f7f

/* BMP380 specific registers */
#define BMP380_REG_CMD			0x7E
#define BMP380_REG_CONFIG		0x1F
#define BMP380_REG_ODR			0x1D
#define BMP380_REG_OSR			0x1C
#define BMP380_REG_POWER_CONTROL	0x1B
#define BMP380_REG_IF_CONFIG		0x1A
#define BMP380_REG_INT_CONTROL		0x19
#define BMP380_REG_INT_STATUS		0x11
#define BMP380_REG_EVENT		0x10
#define BMP380_REG_STATUS		0x03
#define BMP380_REG_ERROR		0x02
#define BMP380_REG_ID			0x00

#define BMP380_REG_FIFO_CONFIG_1	0x18
#define BMP380_REG_FIFO_CONFIG_2	0x17
#define BMP380_REG_FIFO_WATERMARK_MSB	0x16
#define BMP380_REG_FIFO_WATERMARK_LSB	0x15
#define BMP380_REG_FIFO_DATA		0x14
#define BMP380_REG_FIFO_LENGTH_MSB	0x13
#define BMP380_REG_FIFO_LENGTH_LSB	0x12

#define BMP380_REG_SENSOR_TIME_MSB	0x0E
#define BMP380_REG_SENSOR_TIME_LSB	0x0D
#define BMP380_REG_SENSOR_TIME_XLSB	0x0C

#define BMP380_REG_TEMP_MSB		0x09
#define BMP380_REG_TEMP_LSB		0x08
#define BMP380_REG_TEMP_XLSB		0x07

#define BMP380_REG_PRESS_MSB		0x06
#define BMP380_REG_PRESS_LSB		0x05
#define BMP380_REG_PRESS_XLSB		0x04

#define BMP380_REG_CALIB_TEMP_START	0x31
#define BMP380_CALIB_REG_COUNT		21

#define BMP380_FILTER_MASK		GENMASK(3, 1)
#define BMP380_FILTER_OFF		0
#define BMP380_FILTER_1X		1
#define BMP380_FILTER_3X		2
#define BMP380_FILTER_7X		3
#define BMP380_FILTER_15X		4
#define BMP380_FILTER_31X		5
#define BMP380_FILTER_63X		6
#define BMP380_FILTER_127X		7

#define BMP380_OSRS_TEMP_MASK		GENMASK(5, 3)
#define BMP380_OSRS_PRESS_MASK		GENMASK(2, 0)

#define BMP380_ODRS_MASK		GENMASK(4, 0)

#define BMP380_CTRL_SENSORS_MASK	GENMASK(1, 0)
#define BMP380_CTRL_SENSORS_PRESS_EN	BIT(0)
#define BMP380_CTRL_SENSORS_TEMP_EN	BIT(1)
#define BMP380_MODE_MASK		GENMASK(5, 4)
#define BMP380_MODE_SLEEP		0
#define BMP380_MODE_FORCED		1
#define BMP380_MODE_NORMAL		3

#define BMP380_MIN_TEMP			-4000
#define BMP380_MAX_TEMP			8500
#define BMP380_MIN_PRES			3000000
#define BMP380_MAX_PRES			12500000

#define BMP380_CMD_NOOP			0x00
#define BMP380_CMD_EXTMODE_EN_MID	0x34
#define BMP380_CMD_FIFO_FLUSH		0xB0
#define BMP380_CMD_SOFT_RESET		0xB6

#define BMP380_STATUS_CMD_RDY_MASK	BIT(4)
#define BMP380_STATUS_DRDY_PRESS_MASK	BIT(5)
#define BMP380_STATUS_DRDY_TEMP_MASK	BIT(6)

#define BMP380_ERR_FATAL_MASK		BIT(0)
#define BMP380_ERR_CMD_MASK		BIT(1)
#define BMP380_ERR_CONF_MASK		BIT(2)

#define BMP380_TEMP_SKIPPED		0x800000
#define BMP380_PRESS_SKIPPED		0x800000

/* BMP280 specific registers */
#define BMP280_REG_HUMIDITY_LSB		0xFE
#define BMP280_REG_HUMIDITY_MSB		0xFD
#define BMP280_REG_TEMP_XLSB		0xFC
#define BMP280_REG_TEMP_LSB		0xFB
#define BMP280_REG_TEMP_MSB		0xFA
#define BMP280_REG_PRESS_XLSB		0xF9
#define BMP280_REG_PRESS_LSB		0xF8
#define BMP280_REG_PRESS_MSB		0xF7

/* Helper mask to truncate excess 4 bits on pressure and temp readings */
#define BMP280_MEAS_TRIM_MASK		GENMASK(24, 4)

#define BMP280_REG_CONFIG		0xF5
#define BMP280_REG_CTRL_MEAS		0xF4
#define BMP280_REG_STATUS		0xF3
#define BMP280_REG_CTRL_HUMIDITY	0xF2

/* Due to non linear mapping, and data sizes we can't do a bulk read */
#define BMP280_REG_COMP_H1		0xA1
#define BMP280_REG_COMP_H2		0xE1
#define BMP280_REG_COMP_H3		0xE3
#define BMP280_REG_COMP_H4		0xE4
#define BMP280_REG_COMP_H5		0xE5
#define BMP280_REG_COMP_H6		0xE7

#define BMP280_REG_COMP_TEMP_START	0x88
#define BMP280_COMP_TEMP_REG_COUNT	6

#define BMP280_REG_COMP_PRESS_START	0x8E
#define BMP280_COMP_PRESS_REG_COUNT	18

#define BMP280_COMP_H5_MASK		GENMASK(15, 4)

#define BMP280_CONTIGUOUS_CALIB_REGS	(BMP280_COMP_TEMP_REG_COUNT + \
					 BMP280_COMP_PRESS_REG_COUNT)

#define BMP280_FILTER_MASK		GENMASK(4, 2)
#define BMP280_FILTER_OFF		0
#define BMP280_FILTER_2X		1
#define BMP280_FILTER_4X		2
#define BMP280_FILTER_8X		3
#define BMP280_FILTER_16X		4

#define BMP280_OSRS_HUMIDITY_MASK	GENMASK(2, 0)
#define BMP280_OSRS_HUMIDITY_SKIP	0
#define BMP280_OSRS_HUMIDITY_1X		1
#define BMP280_OSRS_HUMIDITY_2X		2
#define BMP280_OSRS_HUMIDITY_4X		3
#define BMP280_OSRS_HUMIDITY_8X		4
#define BMP280_OSRS_HUMIDITY_16X	5

#define BMP280_OSRS_TEMP_MASK		GENMASK(7, 5)
#define BMP280_OSRS_TEMP_SKIP		0
#define BMP280_OSRS_TEMP_1X		1
#define BMP280_OSRS_TEMP_2X		2
#define BMP280_OSRS_TEMP_4X		3
#define BMP280_OSRS_TEMP_8X		4
#define BMP280_OSRS_TEMP_16X		5

#define BMP280_OSRS_PRESS_MASK		GENMASK(4, 2)
#define BMP280_OSRS_PRESS_SKIP		0
#define BMP280_OSRS_PRESS_1X		1
#define BMP280_OSRS_PRESS_2X		2
#define BMP280_OSRS_PRESS_4X		3
#define BMP280_OSRS_PRESS_8X		4
#define BMP280_OSRS_PRESS_16X		5

#define BMP280_MODE_MASK		GENMASK(1, 0)
#define BMP280_MODE_SLEEP		0
#define BMP280_MODE_FORCED		1
#define BMP280_MODE_NORMAL		3

/* BMP180 specific registers */
#define BMP180_REG_OUT_XLSB		0xF8
#define BMP180_REG_OUT_LSB		0xF7
#define BMP180_REG_OUT_MSB		0xF6

#define BMP180_REG_CALIB_START		0xAA
#define BMP180_REG_CALIB_COUNT		22

#define BMP180_MEAS_CTRL_MASK		GENMASK(4, 0)
#define BMP180_MEAS_TEMP		0x0E
#define BMP180_MEAS_PRESS		0x14
#define BMP180_MEAS_SCO			BIT(5)
#define BMP180_OSRS_PRESS_MASK		GENMASK(7, 6)
#define BMP180_MEAS_PRESS_1X		0
#define BMP180_MEAS_PRESS_2X		1
#define BMP180_MEAS_PRESS_4X		2
#define BMP180_MEAS_PRESS_8X		3

/* BMP180 and BMP280 common registers */
#define BMP280_REG_CTRL_MEAS		0xF4
#define BMP280_REG_RESET		0xE0
#define BMP280_REG_ID			0xD0

#define BMP380_CHIP_ID			0x50
#define BMP580_CHIP_ID			0x50
#define BMP580_CHIP_ID_ALT		0x51
#define BMP180_CHIP_ID			0x55
#define BMP280_CHIP_ID			0x58
#define BMP390_CHIP_ID			0x60
#define BME280_CHIP_ID			0x60
#define BMP280_SOFT_RESET_VAL		0xB6

/* BMP280 register skipped special values */
#define BMP280_TEMP_SKIPPED		0x80000
#define BMP280_PRESS_SKIPPED		0x80000
#define BMP280_HUMIDITY_SKIPPED		0x8000

/* Core exported structs */

static const char *const bmp280_supply_names[] = {
	"vddd", "vdda"
};

#define BMP280_NUM_SUPPLIES ARRAY_SIZE(bmp280_supply_names)

struct bmp180_calib {
	s16 AC1;
	s16 AC2;
	s16 AC3;
	u16 AC4;
	u16 AC5;
	u16 AC6;
	s16 B1;
	s16 B2;
	s16 MB;
	s16 MC;
	s16 MD;
};

/* See datasheet Section 4.2.2. */
struct bmp280_calib {
	u16 T1;
	s16 T2;
	s16 T3;
	u16 P1;
	s16 P2;
	s16 P3;
	s16 P4;
	s16 P5;
	s16 P6;
	s16 P7;
	s16 P8;
	s16 P9;
	u8  H1;
	s16 H2;
	u8  H3;
	s16 H4;
	s16 H5;
	s8  H6;
};

/* See datasheet Section 3.11.1. */
struct bmp380_calib {
	u16 T1;
	u16 T2;
	s8  T3;
	s16 P1;
	s16 P2;
	s8  P3;
	s8  P4;
	u16 P5;
	u16 P6;
	s8  P7;
	s8  P8;
	s16 P9;
	s8  P10;
	s8  P11;
};

struct bmp280_data {
	struct device *dev;
	struct mutex lock;
	struct regmap *regmap;
	struct completion done;
	bool use_eoc;
	const struct bmp280_chip_info *chip_info;
	union {
		struct bmp180_calib bmp180;
		struct bmp280_calib bmp280;
		struct bmp380_calib bmp380;
	} calib;
	struct regulator_bulk_data supplies[BMP280_NUM_SUPPLIES];
	unsigned int start_up_time; /* in microseconds */

	/* log of base 2 of oversampling rate */
	u8 oversampling_press;
	u8 oversampling_temp;
	u8 oversampling_humid;
	u8 iir_filter_coeff;

	/*
	 * BMP380 devices introduce sampling frequency configuration. See
	 * datasheet sections 3.3.3. and 4.3.19 for more details.
	 *
	 * BMx280 devices allowed indirect configuration of sampling frequency
	 * changing the t_standby duration between measurements, as detailed on
	 * section 3.6.3 of the datasheet.
	 */
	int sampling_freq;

	/*
	 * Carryover value from temperature conversion, used in pressure
	 * calculation.
	 */
	s32 t_fine;

	/*
	 * DMA (thus cache coherency maintenance) may require the
	 * transfer buffers to live in their own cache lines.
	 */
	union {
		/* Sensor data buffer */
		u8 buf[3];
		/* Calibration data buffers */
		__le16 bmp280_cal_buf[BMP280_CONTIGUOUS_CALIB_REGS / 2];
		__be16 bmp180_cal_buf[BMP180_REG_CALIB_COUNT / 2];
		u8 bmp380_cal_buf[BMP380_CALIB_REG_COUNT];
		/* Miscellaneous, endianness-aware data buffers */
		__le16 le16;
		__be16 be16;
	} __aligned(IIO_DMA_MINALIGN);
};

struct bmp280_chip_info {
	unsigned int id_reg;
	const u8 *chip_id;
	int num_chip_id;

	const struct regmap_config *regmap_config;
	bool spi_read_extra_byte;

	const struct iio_chan_spec *channels;
	int num_channels;
	unsigned int start_up_time;

	const int *oversampling_temp_avail;
	int num_oversampling_temp_avail;
	int oversampling_temp_default;

	const int *oversampling_press_avail;
	int num_oversampling_press_avail;
	int oversampling_press_default;

	const int *oversampling_humid_avail;
	int num_oversampling_humid_avail;
	int oversampling_humid_default;

	const int *iir_filter_coeffs_avail;
	int num_iir_filter_coeffs_avail;
	int iir_filter_coeff_default;

	const int (*sampling_freq_avail)[2];
	int num_sampling_freq_avail;
	int sampling_freq_default;

	int (*chip_config)(struct bmp280_data *);
	int (*read_temp)(struct bmp280_data *, int *, int *);
	int (*read_press)(struct bmp280_data *, int *, int *);
	int (*read_humid)(struct bmp280_data *, int *, int *);
	int (*read_calib)(struct bmp280_data *);
	int (*preinit)(struct bmp280_data *);
};

/* Chip infos for each variant */
extern const struct bmp280_chip_info bmp180_chip_info;
extern const struct bmp280_chip_info bmp280_chip_info;
extern const struct bmp280_chip_info bme280_chip_info;
extern const struct bmp280_chip_info bmp380_chip_info;
extern const struct bmp280_chip_info bmp580_chip_info;

/* Regmap configurations */
extern const struct regmap_config bmp180_regmap_config;
extern const struct regmap_config bmp280_regmap_config;
extern const struct regmap_config bmp380_regmap_config;
extern const struct regmap_config bmp580_regmap_config;

/* Probe called from different transports */
int bmp280_common_probe(struct device *dev,
			struct regmap *regmap,
			const struct bmp280_chip_info *,
			const char *name,
			int irq);

/* PM ops */
extern const struct dev_pm_ops bmp280_dev_pm_ops;