xref: /openbmc/linux/drivers/iio/pressure/bmp280.h (revision 3f199b4e)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #include <linux/bitops.h>
3 #include <linux/device.h>
4 #include <linux/iio/iio.h>
5 #include <linux/regmap.h>
6 #include <linux/regulator/consumer.h>
7 
8 
9 /* BMP580 specific registers */
10 #define BMP580_REG_CMD			0x7E
11 #define BMP580_REG_EFF_OSR		0x38
12 #define BMP580_REG_ODR_CONFIG		0x37
13 #define BMP580_REG_OSR_CONFIG		0x36
14 #define BMP580_REG_IF_CONFIG		0x13
15 #define BMP580_REG_REV_ID		0x02
16 #define BMP580_REG_CHIP_ID		0x01
17 /* OOR allows to configure a pressure alarm */
18 #define BMP580_REG_OOR_CONFIG		0x35
19 #define BMP580_REG_OOR_RANGE		0x34
20 #define BMP580_REG_OOR_THR_MSB		0x33
21 #define BMP580_REG_OOR_THR_LSB		0x32
22 /* DSP registers (IIR filters) */
23 #define BMP580_REG_DSP_IIR		0x31
24 #define BMP580_REG_DSP_CONFIG		0x30
25 /* NVM access registers */
26 #define BMP580_REG_NVM_DATA_MSB		0x2D
27 #define BMP580_REG_NVM_DATA_LSB		0x2C
28 #define BMP580_REG_NVM_ADDR		0x2B
29 /* Status registers */
30 #define BMP580_REG_STATUS		0x28
31 #define BMP580_REG_INT_STATUS		0x27
32 #define BMP580_REG_CHIP_STATUS		0x11
33 /* Data registers */
34 #define BMP580_REG_FIFO_DATA		0x29
35 #define BMP580_REG_PRESS_MSB		0x22
36 #define BMP580_REG_PRESS_LSB		0x21
37 #define BMP580_REG_PRESS_XLSB		0x20
38 #define BMP580_REG_TEMP_MSB		0x1F
39 #define BMP580_REG_TEMP_LSB		0x1E
40 #define BMP580_REG_TEMP_XLSB		0x1D
41 /* FIFO config registers */
42 #define BMP580_REG_FIFO_SEL		0x18
43 #define BMP580_REG_FIFO_COUNT		0x17
44 #define BMP580_REG_FIFO_CONFIG		0x16
45 /* Interruptions config registers */
46 #define BMP580_REG_INT_SOURCE		0x15
47 #define BMP580_REG_INT_CONFIG		0x14
48 
49 #define BMP580_CMD_NOOP			0x00
50 #define BMP580_CMD_EXTMODE_SEQ_0	0x73
51 #define BMP580_CMD_EXTMODE_SEQ_1	0xB4
52 #define BMP580_CMD_EXTMODE_SEQ_2	0x69
53 #define BMP580_CMD_NVM_OP_SEQ_0		0x5D
54 #define BMP580_CMD_NVM_READ_SEQ_1	0xA5
55 #define BMP580_CMD_NVM_WRITE_SEQ_1	0xA0
56 #define BMP580_CMD_SOFT_RESET		0xB6
57 
58 #define BMP580_INT_STATUS_POR_MASK	BIT(4)
59 
60 #define BMP580_STATUS_CORE_RDY_MASK	BIT(0)
61 #define BMP580_STATUS_NVM_RDY_MASK	BIT(1)
62 #define BMP580_STATUS_NVM_ERR_MASK	BIT(2)
63 #define BMP580_STATUS_NVM_CMD_ERR_MASK	BIT(3)
64 
65 #define BMP580_OSR_PRESS_MASK		GENMASK(5, 3)
66 #define BMP580_OSR_TEMP_MASK		GENMASK(2, 0)
67 #define BMP580_OSR_PRESS_EN		BIT(6)
68 #define BMP580_EFF_OSR_PRESS_MASK	GENMASK(5, 3)
69 #define BMP580_EFF_OSR_TEMP_MASK	GENMASK(2, 0)
70 #define BMP580_EFF_OSR_VALID_ODR	BIT(7)
71 
72 #define BMP580_ODR_MASK			GENMASK(6, 2)
73 #define BMP580_MODE_MASK		GENMASK(1, 0)
74 #define BMP580_MODE_SLEEP		0
75 #define BMP580_MODE_NORMAL		1
76 #define BMP580_MODE_FORCED		2
77 #define BMP580_MODE_CONTINOUS		3
78 #define BMP580_ODR_DEEPSLEEP_DIS	BIT(7)
79 
80 #define BMP580_DSP_COMP_MASK		GENMASK(1, 0)
81 #define BMP580_DSP_COMP_DIS		0
82 #define BMP580_DSP_TEMP_COMP_EN		1
83 /*
84  * In section 7.27 of datasheet, modes 2 and 3 are technically the same.
85  * Pressure compensation means also enabling temperature compensation
86  */
87 #define BMP580_DSP_PRESS_COMP_EN	2
88 #define BMP580_DSP_PRESS_TEMP_COMP_EN	3
89 #define BMP580_DSP_IIR_FORCED_FLUSH	BIT(2)
90 #define BMP580_DSP_SHDW_IIR_TEMP_EN	BIT(3)
91 #define BMP580_DSP_FIFO_IIR_TEMP_EN	BIT(4)
92 #define BMP580_DSP_SHDW_IIR_PRESS_EN	BIT(5)
93 #define BMP580_DSP_FIFO_IIR_PRESS_EN	BIT(6)
94 #define BMP580_DSP_OOR_IIR_PRESS_EN	BIT(7)
95 
96 #define BMP580_DSP_IIR_PRESS_MASK	GENMASK(5, 3)
97 #define BMP580_DSP_IIR_TEMP_MASK	GENMASK(2, 0)
98 #define BMP580_FILTER_OFF		0
99 #define BMP580_FILTER_1X		1
100 #define BMP580_FILTER_3X		2
101 #define BMP580_FILTER_7X		3
102 #define BMP580_FILTER_15X		4
103 #define BMP580_FILTER_31X		5
104 #define BMP580_FILTER_63X		6
105 #define BMP580_FILTER_127X		7
106 
107 #define BMP580_NVM_ROW_ADDR_MASK	GENMASK(5, 0)
108 #define BMP580_NVM_PROG_EN		BIT(6)
109 
110 #define BMP580_TEMP_SKIPPED		0x7f7f7f
111 #define BMP580_PRESS_SKIPPED		0x7f7f7f
112 
113 /* BMP380 specific registers */
114 #define BMP380_REG_CMD			0x7E
115 #define BMP380_REG_CONFIG		0x1F
116 #define BMP380_REG_ODR			0x1D
117 #define BMP380_REG_OSR			0x1C
118 #define BMP380_REG_POWER_CONTROL	0x1B
119 #define BMP380_REG_IF_CONFIG		0x1A
120 #define BMP380_REG_INT_CONTROL		0x19
121 #define BMP380_REG_INT_STATUS		0x11
122 #define BMP380_REG_EVENT		0x10
123 #define BMP380_REG_STATUS		0x03
124 #define BMP380_REG_ERROR		0x02
125 #define BMP380_REG_ID			0x00
126 
127 #define BMP380_REG_FIFO_CONFIG_1	0x18
128 #define BMP380_REG_FIFO_CONFIG_2	0x17
129 #define BMP380_REG_FIFO_WATERMARK_MSB	0x16
130 #define BMP380_REG_FIFO_WATERMARK_LSB	0x15
131 #define BMP380_REG_FIFO_DATA		0x14
132 #define BMP380_REG_FIFO_LENGTH_MSB	0x13
133 #define BMP380_REG_FIFO_LENGTH_LSB	0x12
134 
135 #define BMP380_REG_SENSOR_TIME_MSB	0x0E
136 #define BMP380_REG_SENSOR_TIME_LSB	0x0D
137 #define BMP380_REG_SENSOR_TIME_XLSB	0x0C
138 
139 #define BMP380_REG_TEMP_MSB		0x09
140 #define BMP380_REG_TEMP_LSB		0x08
141 #define BMP380_REG_TEMP_XLSB		0x07
142 
143 #define BMP380_REG_PRESS_MSB		0x06
144 #define BMP380_REG_PRESS_LSB		0x05
145 #define BMP380_REG_PRESS_XLSB		0x04
146 
147 #define BMP380_REG_CALIB_TEMP_START	0x31
148 #define BMP380_CALIB_REG_COUNT		21
149 
150 #define BMP380_FILTER_MASK		GENMASK(3, 1)
151 #define BMP380_FILTER_OFF		0
152 #define BMP380_FILTER_1X		1
153 #define BMP380_FILTER_3X		2
154 #define BMP380_FILTER_7X		3
155 #define BMP380_FILTER_15X		4
156 #define BMP380_FILTER_31X		5
157 #define BMP380_FILTER_63X		6
158 #define BMP380_FILTER_127X		7
159 
160 #define BMP380_OSRS_TEMP_MASK		GENMASK(5, 3)
161 #define BMP380_OSRS_PRESS_MASK		GENMASK(2, 0)
162 
163 #define BMP380_ODRS_MASK		GENMASK(4, 0)
164 
165 #define BMP380_CTRL_SENSORS_MASK	GENMASK(1, 0)
166 #define BMP380_CTRL_SENSORS_PRESS_EN	BIT(0)
167 #define BMP380_CTRL_SENSORS_TEMP_EN	BIT(1)
168 #define BMP380_MODE_MASK		GENMASK(5, 4)
169 #define BMP380_MODE_SLEEP		0
170 #define BMP380_MODE_FORCED		1
171 #define BMP380_MODE_NORMAL		3
172 
173 #define BMP380_MIN_TEMP			-4000
174 #define BMP380_MAX_TEMP			8500
175 #define BMP380_MIN_PRES			3000000
176 #define BMP380_MAX_PRES			12500000
177 
178 #define BMP380_CMD_NOOP			0x00
179 #define BMP380_CMD_EXTMODE_EN_MID	0x34
180 #define BMP380_CMD_FIFO_FLUSH		0xB0
181 #define BMP380_CMD_SOFT_RESET		0xB6
182 
183 #define BMP380_STATUS_CMD_RDY_MASK	BIT(4)
184 #define BMP380_STATUS_DRDY_PRESS_MASK	BIT(5)
185 #define BMP380_STATUS_DRDY_TEMP_MASK	BIT(6)
186 
187 #define BMP380_ERR_FATAL_MASK		BIT(0)
188 #define BMP380_ERR_CMD_MASK		BIT(1)
189 #define BMP380_ERR_CONF_MASK		BIT(2)
190 
191 #define BMP380_TEMP_SKIPPED		0x800000
192 #define BMP380_PRESS_SKIPPED		0x800000
193 
194 /* BMP280 specific registers */
195 #define BMP280_REG_HUMIDITY_LSB		0xFE
196 #define BMP280_REG_HUMIDITY_MSB		0xFD
197 #define BMP280_REG_TEMP_XLSB		0xFC
198 #define BMP280_REG_TEMP_LSB		0xFB
199 #define BMP280_REG_TEMP_MSB		0xFA
200 #define BMP280_REG_PRESS_XLSB		0xF9
201 #define BMP280_REG_PRESS_LSB		0xF8
202 #define BMP280_REG_PRESS_MSB		0xF7
203 
204 /* Helper mask to truncate excess 4 bits on pressure and temp readings */
205 #define BMP280_MEAS_TRIM_MASK		GENMASK(24, 4)
206 
207 #define BMP280_REG_CONFIG		0xF5
208 #define BMP280_REG_CTRL_MEAS		0xF4
209 #define BMP280_REG_STATUS		0xF3
210 #define BMP280_REG_CTRL_HUMIDITY	0xF2
211 
212 /* Due to non linear mapping, and data sizes we can't do a bulk read */
213 #define BMP280_REG_COMP_H1		0xA1
214 #define BMP280_REG_COMP_H2		0xE1
215 #define BMP280_REG_COMP_H3		0xE3
216 #define BMP280_REG_COMP_H4		0xE4
217 #define BMP280_REG_COMP_H5		0xE5
218 #define BMP280_REG_COMP_H6		0xE7
219 
220 #define BMP280_REG_COMP_TEMP_START	0x88
221 #define BMP280_COMP_TEMP_REG_COUNT	6
222 
223 #define BMP280_REG_COMP_PRESS_START	0x8E
224 #define BMP280_COMP_PRESS_REG_COUNT	18
225 
226 #define BMP280_COMP_H5_MASK		GENMASK(15, 4)
227 
228 #define BMP280_CONTIGUOUS_CALIB_REGS	(BMP280_COMP_TEMP_REG_COUNT + \
229 					 BMP280_COMP_PRESS_REG_COUNT)
230 
231 #define BMP280_FILTER_MASK		GENMASK(4, 2)
232 #define BMP280_FILTER_OFF		0
233 #define BMP280_FILTER_2X		1
234 #define BMP280_FILTER_4X		2
235 #define BMP280_FILTER_8X		3
236 #define BMP280_FILTER_16X		4
237 
238 #define BMP280_OSRS_HUMIDITY_MASK	GENMASK(2, 0)
239 #define BMP280_OSRS_HUMIDITY_SKIP	0
240 #define BMP280_OSRS_HUMIDITY_1X		1
241 #define BMP280_OSRS_HUMIDITY_2X		2
242 #define BMP280_OSRS_HUMIDITY_4X		3
243 #define BMP280_OSRS_HUMIDITY_8X		4
244 #define BMP280_OSRS_HUMIDITY_16X	5
245 
246 #define BMP280_OSRS_TEMP_MASK		GENMASK(7, 5)
247 #define BMP280_OSRS_TEMP_SKIP		0
248 #define BMP280_OSRS_TEMP_1X		1
249 #define BMP280_OSRS_TEMP_2X		2
250 #define BMP280_OSRS_TEMP_4X		3
251 #define BMP280_OSRS_TEMP_8X		4
252 #define BMP280_OSRS_TEMP_16X		5
253 
254 #define BMP280_OSRS_PRESS_MASK		GENMASK(4, 2)
255 #define BMP280_OSRS_PRESS_SKIP		0
256 #define BMP280_OSRS_PRESS_1X		1
257 #define BMP280_OSRS_PRESS_2X		2
258 #define BMP280_OSRS_PRESS_4X		3
259 #define BMP280_OSRS_PRESS_8X		4
260 #define BMP280_OSRS_PRESS_16X		5
261 
262 #define BMP280_MODE_MASK		GENMASK(1, 0)
263 #define BMP280_MODE_SLEEP		0
264 #define BMP280_MODE_FORCED		1
265 #define BMP280_MODE_NORMAL		3
266 
267 /* BMP180 specific registers */
268 #define BMP180_REG_OUT_XLSB		0xF8
269 #define BMP180_REG_OUT_LSB		0xF7
270 #define BMP180_REG_OUT_MSB		0xF6
271 
272 #define BMP180_REG_CALIB_START		0xAA
273 #define BMP180_REG_CALIB_COUNT		22
274 
275 #define BMP180_MEAS_CTRL_MASK		GENMASK(4, 0)
276 #define BMP180_MEAS_TEMP		0x0E
277 #define BMP180_MEAS_PRESS		0x14
278 #define BMP180_MEAS_SCO			BIT(5)
279 #define BMP180_OSRS_PRESS_MASK		GENMASK(7, 6)
280 #define BMP180_MEAS_PRESS_1X		0
281 #define BMP180_MEAS_PRESS_2X		1
282 #define BMP180_MEAS_PRESS_4X		2
283 #define BMP180_MEAS_PRESS_8X		3
284 
285 /* BMP180 and BMP280 common registers */
286 #define BMP280_REG_CTRL_MEAS		0xF4
287 #define BMP280_REG_RESET		0xE0
288 #define BMP280_REG_ID			0xD0
289 
290 #define BMP380_CHIP_ID			0x50
291 #define BMP580_CHIP_ID			0x50
292 #define BMP580_CHIP_ID_ALT		0x51
293 #define BMP180_CHIP_ID			0x55
294 #define BMP280_CHIP_ID			0x58
295 #define BME280_CHIP_ID			0x60
296 #define BMP280_SOFT_RESET_VAL		0xB6
297 
298 /* BMP280 register skipped special values */
299 #define BMP280_TEMP_SKIPPED		0x80000
300 #define BMP280_PRESS_SKIPPED		0x80000
301 #define BMP280_HUMIDITY_SKIPPED		0x8000
302 
303 /* Core exported structs */
304 
305 static const char *const bmp280_supply_names[] = {
306 	"vddd", "vdda"
307 };
308 
309 #define BMP280_NUM_SUPPLIES ARRAY_SIZE(bmp280_supply_names)
310 
311 struct bmp180_calib {
312 	s16 AC1;
313 	s16 AC2;
314 	s16 AC3;
315 	u16 AC4;
316 	u16 AC5;
317 	u16 AC6;
318 	s16 B1;
319 	s16 B2;
320 	s16 MB;
321 	s16 MC;
322 	s16 MD;
323 };
324 
325 /* See datasheet Section 4.2.2. */
326 struct bmp280_calib {
327 	u16 T1;
328 	s16 T2;
329 	s16 T3;
330 	u16 P1;
331 	s16 P2;
332 	s16 P3;
333 	s16 P4;
334 	s16 P5;
335 	s16 P6;
336 	s16 P7;
337 	s16 P8;
338 	s16 P9;
339 	u8  H1;
340 	s16 H2;
341 	u8  H3;
342 	s16 H4;
343 	s16 H5;
344 	s8  H6;
345 };
346 
347 /* See datasheet Section 3.11.1. */
348 struct bmp380_calib {
349 	u16 T1;
350 	u16 T2;
351 	s8  T3;
352 	s16 P1;
353 	s16 P2;
354 	s8  P3;
355 	s8  P4;
356 	u16 P5;
357 	u16 P6;
358 	s8  P7;
359 	s8  P8;
360 	s16 P9;
361 	s8  P10;
362 	s8  P11;
363 };
364 
365 struct bmp280_data {
366 	struct device *dev;
367 	struct mutex lock;
368 	struct regmap *regmap;
369 	struct completion done;
370 	bool use_eoc;
371 	const struct bmp280_chip_info *chip_info;
372 	union {
373 		struct bmp180_calib bmp180;
374 		struct bmp280_calib bmp280;
375 		struct bmp380_calib bmp380;
376 	} calib;
377 	struct regulator_bulk_data supplies[BMP280_NUM_SUPPLIES];
378 	unsigned int start_up_time; /* in microseconds */
379 
380 	/* log of base 2 of oversampling rate */
381 	u8 oversampling_press;
382 	u8 oversampling_temp;
383 	u8 oversampling_humid;
384 	u8 iir_filter_coeff;
385 
386 	/*
387 	 * BMP380 devices introduce sampling frequency configuration. See
388 	 * datasheet sections 3.3.3. and 4.3.19 for more details.
389 	 *
390 	 * BMx280 devices allowed indirect configuration of sampling frequency
391 	 * changing the t_standby duration between measurements, as detailed on
392 	 * section 3.6.3 of the datasheet.
393 	 */
394 	int sampling_freq;
395 
396 	/*
397 	 * Carryover value from temperature conversion, used in pressure
398 	 * calculation.
399 	 */
400 	s32 t_fine;
401 
402 	/*
403 	 * DMA (thus cache coherency maintenance) may require the
404 	 * transfer buffers to live in their own cache lines.
405 	 */
406 	union {
407 		/* Sensor data buffer */
408 		u8 buf[3];
409 		/* Calibration data buffers */
410 		__le16 bmp280_cal_buf[BMP280_CONTIGUOUS_CALIB_REGS / 2];
411 		__be16 bmp180_cal_buf[BMP180_REG_CALIB_COUNT / 2];
412 		u8 bmp380_cal_buf[BMP380_CALIB_REG_COUNT];
413 		/* Miscellaneous, endianness-aware data buffers */
414 		__le16 le16;
415 		__be16 be16;
416 	} __aligned(IIO_DMA_MINALIGN);
417 };
418 
419 struct bmp280_chip_info {
420 	unsigned int id_reg;
421 	const unsigned int chip_id;
422 
423 	const struct regmap_config *regmap_config;
424 
425 	const struct iio_chan_spec *channels;
426 	int num_channels;
427 	unsigned int start_up_time;
428 
429 	const int *oversampling_temp_avail;
430 	int num_oversampling_temp_avail;
431 	int oversampling_temp_default;
432 
433 	const int *oversampling_press_avail;
434 	int num_oversampling_press_avail;
435 	int oversampling_press_default;
436 
437 	const int *oversampling_humid_avail;
438 	int num_oversampling_humid_avail;
439 	int oversampling_humid_default;
440 
441 	const int *iir_filter_coeffs_avail;
442 	int num_iir_filter_coeffs_avail;
443 	int iir_filter_coeff_default;
444 
445 	const int (*sampling_freq_avail)[2];
446 	int num_sampling_freq_avail;
447 	int sampling_freq_default;
448 
449 	int (*chip_config)(struct bmp280_data *);
450 	int (*read_temp)(struct bmp280_data *, int *, int *);
451 	int (*read_press)(struct bmp280_data *, int *, int *);
452 	int (*read_humid)(struct bmp280_data *, int *, int *);
453 	int (*read_calib)(struct bmp280_data *);
454 	int (*preinit)(struct bmp280_data *);
455 };
456 
457 /* Chip infos for each variant */
458 extern const struct bmp280_chip_info bmp180_chip_info;
459 extern const struct bmp280_chip_info bmp280_chip_info;
460 extern const struct bmp280_chip_info bme280_chip_info;
461 extern const struct bmp280_chip_info bmp380_chip_info;
462 extern const struct bmp280_chip_info bmp580_chip_info;
463 
464 /* Regmap configurations */
465 extern const struct regmap_config bmp180_regmap_config;
466 extern const struct regmap_config bmp280_regmap_config;
467 extern const struct regmap_config bmp380_regmap_config;
468 extern const struct regmap_config bmp580_regmap_config;
469 
470 /* Probe called from different transports */
471 int bmp280_common_probe(struct device *dev,
472 			struct regmap *regmap,
473 			const struct bmp280_chip_info *,
474 			const char *name,
475 			int irq);
476 
477 /* PM ops */
478 extern const struct dev_pm_ops bmp280_dev_pm_ops;
479