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13#include <linux/module.h>
14#include <linux/iio/iio.h>
15#include <linux/delay.h>
16#include <linux/regulator/consumer.h>
17
18#include <linux/iio/sysfs.h>
19#include <linux/iio/buffer.h>
20#include <linux/iio/triggered_buffer.h>
21#include <linux/iio/trigger_consumer.h>
22#include "ms5611.h"
23
24#define MS5611_INIT_OSR(_cmd, _conv_usec, _rate) \
25 { .cmd = _cmd, .conv_usec = _conv_usec, .rate = _rate }
26
27static const struct ms5611_osr ms5611_avail_pressure_osr[] = {
28 MS5611_INIT_OSR(0x40, 600, 256),
29 MS5611_INIT_OSR(0x42, 1170, 512),
30 MS5611_INIT_OSR(0x44, 2280, 1024),
31 MS5611_INIT_OSR(0x46, 4540, 2048),
32 MS5611_INIT_OSR(0x48, 9040, 4096)
33};
34
35static const struct ms5611_osr ms5611_avail_temp_osr[] = {
36 MS5611_INIT_OSR(0x50, 600, 256),
37 MS5611_INIT_OSR(0x52, 1170, 512),
38 MS5611_INIT_OSR(0x54, 2280, 1024),
39 MS5611_INIT_OSR(0x56, 4540, 2048),
40 MS5611_INIT_OSR(0x58, 9040, 4096)
41};
42
43static const char ms5611_show_osr[] = "256 512 1024 2048 4096";
44
45static IIO_CONST_ATTR(oversampling_ratio_available, ms5611_show_osr);
46
47static struct attribute *ms5611_attributes[] = {
48 &iio_const_attr_oversampling_ratio_available.dev_attr.attr,
49 NULL,
50};
51
52static const struct attribute_group ms5611_attribute_group = {
53 .attrs = ms5611_attributes,
54};
55
56static bool ms5611_prom_is_valid(u16 *prom, size_t len)
57{
58 int i, j;
59 uint16_t crc = 0, crc_orig = prom[7] & 0x000F;
60
61 prom[7] &= 0xFF00;
62
63 for (i = 0; i < len * 2; i++) {
64 if (i % 2 == 1)
65 crc ^= prom[i >> 1] & 0x00FF;
66 else
67 crc ^= prom[i >> 1] >> 8;
68
69 for (j = 0; j < 8; j++) {
70 if (crc & 0x8000)
71 crc = (crc << 1) ^ 0x3000;
72 else
73 crc <<= 1;
74 }
75 }
76
77 crc = (crc >> 12) & 0x000F;
78
79 return crc_orig != 0x0000 && crc == crc_orig;
80}
81
82static int ms5611_read_prom(struct iio_dev *indio_dev)
83{
84 int ret, i;
85 struct ms5611_state *st = iio_priv(indio_dev);
86
87 for (i = 0; i < MS5611_PROM_WORDS_NB; i++) {
88 ret = st->read_prom_word(&indio_dev->dev,
89 i, &st->chip_info->prom[i]);
90 if (ret < 0) {
91 dev_err(&indio_dev->dev,
92 "failed to read prom at %d\n", i);
93 return ret;
94 }
95 }
96
97 if (!ms5611_prom_is_valid(st->chip_info->prom, MS5611_PROM_WORDS_NB)) {
98 dev_err(&indio_dev->dev, "PROM integrity check failed\n");
99 return -ENODEV;
100 }
101
102 return 0;
103}
104
105static int ms5611_read_temp_and_pressure(struct iio_dev *indio_dev,
106 s32 *temp, s32 *pressure)
107{
108 int ret;
109 struct ms5611_state *st = iio_priv(indio_dev);
110
111 ret = st->read_adc_temp_and_pressure(&indio_dev->dev, temp, pressure);
112 if (ret < 0) {
113 dev_err(&indio_dev->dev,
114 "failed to read temperature and pressure\n");
115 return ret;
116 }
117
118 return st->chip_info->temp_and_pressure_compensate(st->chip_info,
119 temp, pressure);
120}
121
122static int ms5611_temp_and_pressure_compensate(struct ms5611_chip_info *chip_info,
123 s32 *temp, s32 *pressure)
124{
125 s32 t = *temp, p = *pressure;
126 s64 off, sens, dt;
127
128 dt = t - (chip_info->prom[5] << 8);
129 off = ((s64)chip_info->prom[2] << 16) + ((chip_info->prom[4] * dt) >> 7);
130 sens = ((s64)chip_info->prom[1] << 15) + ((chip_info->prom[3] * dt) >> 8);
131
132 t = 2000 + ((chip_info->prom[6] * dt) >> 23);
133 if (t < 2000) {
134 s64 off2, sens2, t2;
135
136 t2 = (dt * dt) >> 31;
137 off2 = (5 * (t - 2000) * (t - 2000)) >> 1;
138 sens2 = off2 >> 1;
139
140 if (t < -1500) {
141 s64 tmp = (t + 1500) * (t + 1500);
142
143 off2 += 7 * tmp;
144 sens2 += (11 * tmp) >> 1;
145 }
146
147 t -= t2;
148 off -= off2;
149 sens -= sens2;
150 }
151
152 *temp = t;
153 *pressure = (((p * sens) >> 21) - off) >> 15;
154
155 return 0;
156}
157
158static int ms5607_temp_and_pressure_compensate(struct ms5611_chip_info *chip_info,
159 s32 *temp, s32 *pressure)
160{
161 s32 t = *temp, p = *pressure;
162 s64 off, sens, dt;
163
164 dt = t - (chip_info->prom[5] << 8);
165 off = ((s64)chip_info->prom[2] << 17) + ((chip_info->prom[4] * dt) >> 6);
166 sens = ((s64)chip_info->prom[1] << 16) + ((chip_info->prom[3] * dt) >> 7);
167
168 t = 2000 + ((chip_info->prom[6] * dt) >> 23);
169 if (t < 2000) {
170 s64 off2, sens2, t2, tmp;
171
172 t2 = (dt * dt) >> 31;
173 tmp = (t - 2000) * (t - 2000);
174 off2 = (61 * tmp) >> 4;
175 sens2 = tmp << 1;
176
177 if (t < -1500) {
178 tmp = (t + 1500) * (t + 1500);
179 off2 += 15 * tmp;
180 sens2 += 8 * tmp;
181 }
182
183 t -= t2;
184 off -= off2;
185 sens -= sens2;
186 }
187
188 *temp = t;
189 *pressure = (((p * sens) >> 21) - off) >> 15;
190
191 return 0;
192}
193
194static int ms5611_reset(struct iio_dev *indio_dev)
195{
196 int ret;
197 struct ms5611_state *st = iio_priv(indio_dev);
198
199 ret = st->reset(&indio_dev->dev);
200 if (ret < 0) {
201 dev_err(&indio_dev->dev, "failed to reset device\n");
202 return ret;
203 }
204
205 usleep_range(3000, 4000);
206
207 return 0;
208}
209
210static irqreturn_t ms5611_trigger_handler(int irq, void *p)
211{
212 struct iio_poll_func *pf = p;
213 struct iio_dev *indio_dev = pf->indio_dev;
214 struct ms5611_state *st = iio_priv(indio_dev);
215
216 struct {
217 s32 channels[2];
218 s64 ts __aligned(8);
219 } scan;
220 int ret;
221
222 mutex_lock(&st->lock);
223 ret = ms5611_read_temp_and_pressure(indio_dev, &scan.channels[1],
224 &scan.channels[0]);
225 mutex_unlock(&st->lock);
226 if (ret < 0)
227 goto err;
228
229 iio_push_to_buffers_with_timestamp(indio_dev, &scan,
230 iio_get_time_ns(indio_dev));
231
232err:
233 iio_trigger_notify_done(indio_dev->trig);
234
235 return IRQ_HANDLED;
236}
237
238static int ms5611_read_raw(struct iio_dev *indio_dev,
239 struct iio_chan_spec const *chan,
240 int *val, int *val2, long mask)
241{
242 int ret;
243 s32 temp, pressure;
244 struct ms5611_state *st = iio_priv(indio_dev);
245
246 switch (mask) {
247 case IIO_CHAN_INFO_PROCESSED:
248 mutex_lock(&st->lock);
249 ret = ms5611_read_temp_and_pressure(indio_dev,
250 &temp, &pressure);
251 mutex_unlock(&st->lock);
252 if (ret < 0)
253 return ret;
254
255 switch (chan->type) {
256 case IIO_TEMP:
257 *val = temp * 10;
258 return IIO_VAL_INT;
259 case IIO_PRESSURE:
260 *val = pressure / 1000;
261 *val2 = (pressure % 1000) * 1000;
262 return IIO_VAL_INT_PLUS_MICRO;
263 default:
264 return -EINVAL;
265 }
266 case IIO_CHAN_INFO_SCALE:
267 switch (chan->type) {
268 case IIO_TEMP:
269 *val = 10;
270 return IIO_VAL_INT;
271 case IIO_PRESSURE:
272 *val = 0;
273 *val2 = 1000;
274 return IIO_VAL_INT_PLUS_MICRO;
275 default:
276 return -EINVAL;
277 }
278 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
279 if (chan->type != IIO_TEMP && chan->type != IIO_PRESSURE)
280 break;
281 mutex_lock(&st->lock);
282 if (chan->type == IIO_TEMP)
283 *val = (int)st->temp_osr->rate;
284 else
285 *val = (int)st->pressure_osr->rate;
286 mutex_unlock(&st->lock);
287 return IIO_VAL_INT;
288 }
289
290 return -EINVAL;
291}
292
293static const struct ms5611_osr *ms5611_find_osr(int rate,
294 const struct ms5611_osr *osr,
295 size_t count)
296{
297 unsigned int r;
298
299 for (r = 0; r < count; r++)
300 if ((unsigned short)rate == osr[r].rate)
301 break;
302 if (r >= count)
303 return NULL;
304 return &osr[r];
305}
306
307static int ms5611_write_raw(struct iio_dev *indio_dev,
308 struct iio_chan_spec const *chan,
309 int val, int val2, long mask)
310{
311 struct ms5611_state *st = iio_priv(indio_dev);
312 const struct ms5611_osr *osr = NULL;
313 int ret;
314
315 if (mask != IIO_CHAN_INFO_OVERSAMPLING_RATIO)
316 return -EINVAL;
317
318 if (chan->type == IIO_TEMP)
319 osr = ms5611_find_osr(val, ms5611_avail_temp_osr,
320 ARRAY_SIZE(ms5611_avail_temp_osr));
321 else if (chan->type == IIO_PRESSURE)
322 osr = ms5611_find_osr(val, ms5611_avail_pressure_osr,
323 ARRAY_SIZE(ms5611_avail_pressure_osr));
324 if (!osr)
325 return -EINVAL;
326
327 ret = iio_device_claim_direct_mode(indio_dev);
328 if (ret)
329 return ret;
330
331 mutex_lock(&st->lock);
332
333 if (chan->type == IIO_TEMP)
334 st->temp_osr = osr;
335 else
336 st->pressure_osr = osr;
337
338 mutex_unlock(&st->lock);
339 iio_device_release_direct_mode(indio_dev);
340
341 return 0;
342}
343
344static const unsigned long ms5611_scan_masks[] = {0x3, 0};
345
346static struct ms5611_chip_info chip_info_tbl[] = {
347 [MS5611] = {
348 .temp_and_pressure_compensate = ms5611_temp_and_pressure_compensate,
349 },
350 [MS5607] = {
351 .temp_and_pressure_compensate = ms5607_temp_and_pressure_compensate,
352 }
353};
354
355static const struct iio_chan_spec ms5611_channels[] = {
356 {
357 .type = IIO_PRESSURE,
358 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
359 BIT(IIO_CHAN_INFO_SCALE) |
360 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
361 .scan_index = 0,
362 .scan_type = {
363 .sign = 's',
364 .realbits = 32,
365 .storagebits = 32,
366 .endianness = IIO_CPU,
367 },
368 },
369 {
370 .type = IIO_TEMP,
371 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
372 BIT(IIO_CHAN_INFO_SCALE) |
373 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
374 .scan_index = 1,
375 .scan_type = {
376 .sign = 's',
377 .realbits = 32,
378 .storagebits = 32,
379 .endianness = IIO_CPU,
380 },
381 },
382 IIO_CHAN_SOFT_TIMESTAMP(2),
383};
384
385static const struct iio_info ms5611_info = {
386 .read_raw = &ms5611_read_raw,
387 .write_raw = &ms5611_write_raw,
388 .attrs = &ms5611_attribute_group,
389};
390
391static int ms5611_init(struct iio_dev *indio_dev)
392{
393 int ret;
394 struct ms5611_state *st = iio_priv(indio_dev);
395
396
397 st->vdd = devm_regulator_get(indio_dev->dev.parent, "vdd");
398 if (IS_ERR(st->vdd))
399 return PTR_ERR(st->vdd);
400
401 ret = regulator_enable(st->vdd);
402 if (ret) {
403 dev_err(indio_dev->dev.parent,
404 "failed to enable Vdd supply: %d\n", ret);
405 return ret;
406 }
407
408 ret = ms5611_reset(indio_dev);
409 if (ret < 0)
410 goto err_regulator_disable;
411
412 ret = ms5611_read_prom(indio_dev);
413 if (ret < 0)
414 goto err_regulator_disable;
415
416 return 0;
417
418err_regulator_disable:
419 regulator_disable(st->vdd);
420 return ret;
421}
422
423static void ms5611_fini(const struct iio_dev *indio_dev)
424{
425 const struct ms5611_state *st = iio_priv(indio_dev);
426
427 regulator_disable(st->vdd);
428}
429
430int ms5611_probe(struct iio_dev *indio_dev, struct device *dev,
431 const char *name, int type)
432{
433 int ret;
434 struct ms5611_state *st = iio_priv(indio_dev);
435
436 mutex_init(&st->lock);
437 st->chip_info = &chip_info_tbl[type];
438 st->temp_osr =
439 &ms5611_avail_temp_osr[ARRAY_SIZE(ms5611_avail_temp_osr) - 1];
440 st->pressure_osr =
441 &ms5611_avail_pressure_osr[ARRAY_SIZE(ms5611_avail_pressure_osr)
442 - 1];
443 indio_dev->name = name;
444 indio_dev->info = &ms5611_info;
445 indio_dev->channels = ms5611_channels;
446 indio_dev->num_channels = ARRAY_SIZE(ms5611_channels);
447 indio_dev->modes = INDIO_DIRECT_MODE;
448 indio_dev->available_scan_masks = ms5611_scan_masks;
449
450 ret = ms5611_init(indio_dev);
451 if (ret < 0)
452 return ret;
453
454 ret = iio_triggered_buffer_setup(indio_dev, NULL,
455 ms5611_trigger_handler, NULL);
456 if (ret < 0) {
457 dev_err(dev, "iio triggered buffer setup failed\n");
458 goto err_fini;
459 }
460
461 ret = iio_device_register(indio_dev);
462 if (ret < 0) {
463 dev_err(dev, "unable to register iio device\n");
464 goto err_buffer_cleanup;
465 }
466
467 return 0;
468
469err_buffer_cleanup:
470 iio_triggered_buffer_cleanup(indio_dev);
471err_fini:
472 ms5611_fini(indio_dev);
473 return ret;
474}
475EXPORT_SYMBOL(ms5611_probe);
476
477int ms5611_remove(struct iio_dev *indio_dev)
478{
479 iio_device_unregister(indio_dev);
480 iio_triggered_buffer_cleanup(indio_dev);
481 ms5611_fini(indio_dev);
482
483 return 0;
484}
485EXPORT_SYMBOL(ms5611_remove);
486
487MODULE_AUTHOR("Tomasz Duszynski <tduszyns@gmail.com>");
488MODULE_DESCRIPTION("MS5611 core driver");
489MODULE_LICENSE("GPL v2");
490
