1
2
3
4
5
6#include <linux/device.h>
7#include <linux/platform_device.h>
8#include <linux/module.h>
9#include <linux/interrupt.h>
10#include <linux/irq.h>
11#include <linux/kernel.h>
12#include <linux/slab.h>
13#include <linux/time.h>
14
15#include <linux/hid-sensor-hub.h>
16#include <linux/iio/iio.h>
17#include <linux/iio/sysfs.h>
18
19#define HZ_PER_MHZ 1000000L
20
21static struct {
22 u32 usage_id;
23 int unit;
24 int scale_val0;
25 int scale_val1;
26} unit_conversion[] = {
27 {HID_USAGE_SENSOR_ACCEL_3D, 0, 9, 806650000},
28 {HID_USAGE_SENSOR_ACCEL_3D,
29 HID_USAGE_SENSOR_UNITS_METERS_PER_SEC_SQRD, 1, 0},
30 {HID_USAGE_SENSOR_ACCEL_3D,
31 HID_USAGE_SENSOR_UNITS_G, 9, 806650000},
32
33 {HID_USAGE_SENSOR_GRAVITY_VECTOR, 0, 9, 806650000},
34 {HID_USAGE_SENSOR_GRAVITY_VECTOR,
35 HID_USAGE_SENSOR_UNITS_METERS_PER_SEC_SQRD, 1, 0},
36 {HID_USAGE_SENSOR_GRAVITY_VECTOR,
37 HID_USAGE_SENSOR_UNITS_G, 9, 806650000},
38
39 {HID_USAGE_SENSOR_GYRO_3D, 0, 0, 17453293},
40 {HID_USAGE_SENSOR_GYRO_3D,
41 HID_USAGE_SENSOR_UNITS_RADIANS_PER_SECOND, 1, 0},
42 {HID_USAGE_SENSOR_GYRO_3D,
43 HID_USAGE_SENSOR_UNITS_DEGREES_PER_SECOND, 0, 17453293},
44
45 {HID_USAGE_SENSOR_COMPASS_3D, 0, 0, 1000000},
46 {HID_USAGE_SENSOR_COMPASS_3D, HID_USAGE_SENSOR_UNITS_GAUSS, 1, 0},
47
48 {HID_USAGE_SENSOR_INCLINOMETER_3D, 0, 0, 17453293},
49 {HID_USAGE_SENSOR_INCLINOMETER_3D,
50 HID_USAGE_SENSOR_UNITS_DEGREES, 0, 17453293},
51 {HID_USAGE_SENSOR_INCLINOMETER_3D,
52 HID_USAGE_SENSOR_UNITS_RADIANS, 1, 0},
53
54 {HID_USAGE_SENSOR_ALS, 0, 1, 0},
55 {HID_USAGE_SENSOR_ALS, HID_USAGE_SENSOR_UNITS_LUX, 1, 0},
56
57 {HID_USAGE_SENSOR_PRESSURE, 0, 100, 0},
58 {HID_USAGE_SENSOR_PRESSURE, HID_USAGE_SENSOR_UNITS_PASCAL, 0, 1000000},
59
60 {HID_USAGE_SENSOR_TIME_TIMESTAMP, 0, 1000000000, 0},
61 {HID_USAGE_SENSOR_TIME_TIMESTAMP, HID_USAGE_SENSOR_UNITS_MILLISECOND,
62 1000000, 0},
63
64 {HID_USAGE_SENSOR_DEVICE_ORIENTATION, 0, 1, 0},
65
66 {HID_USAGE_SENSOR_RELATIVE_ORIENTATION, 0, 1, 0},
67
68 {HID_USAGE_SENSOR_GEOMAGNETIC_ORIENTATION, 0, 1, 0},
69
70 {HID_USAGE_SENSOR_TEMPERATURE, 0, 1000, 0},
71 {HID_USAGE_SENSOR_TEMPERATURE, HID_USAGE_SENSOR_UNITS_DEGREES, 1000, 0},
72
73 {HID_USAGE_SENSOR_HUMIDITY, 0, 1000, 0},
74};
75
76static void simple_div(int dividend, int divisor, int *whole,
77 int *micro_frac)
78{
79 int rem;
80 int exp = 0;
81
82 *micro_frac = 0;
83 if (divisor == 0) {
84 *whole = 0;
85 return;
86 }
87 *whole = dividend/divisor;
88 rem = dividend % divisor;
89 if (rem) {
90 while (rem <= divisor) {
91 rem *= 10;
92 exp++;
93 }
94 *micro_frac = (rem / divisor) * int_pow(10, 6 - exp);
95 }
96}
97
98static void split_micro_fraction(unsigned int no, int exp, int *val1, int *val2)
99{
100 int divisor = int_pow(10, exp);
101
102 *val1 = no / divisor;
103 *val2 = no % divisor * int_pow(10, 6 - exp);
104}
105
106
107
108
109
110
111
112
113
114static void convert_from_vtf_format(u32 value, int size, int exp,
115 int *val1, int *val2)
116{
117 int sign = 1;
118
119 if (value & BIT(size*8 - 1)) {
120 value = ((1LL << (size * 8)) - value);
121 sign = -1;
122 }
123 exp = hid_sensor_convert_exponent(exp);
124 if (exp >= 0) {
125 *val1 = sign * value * int_pow(10, exp);
126 *val2 = 0;
127 } else {
128 split_micro_fraction(value, -exp, val1, val2);
129 if (*val1)
130 *val1 = sign * (*val1);
131 else
132 *val2 = sign * (*val2);
133 }
134}
135
136static u32 convert_to_vtf_format(int size, int exp, int val1, int val2)
137{
138 int divisor;
139 u32 value;
140 int sign = 1;
141
142 if (val1 < 0 || val2 < 0)
143 sign = -1;
144 exp = hid_sensor_convert_exponent(exp);
145 if (exp < 0) {
146 divisor = int_pow(10, 6 + exp);
147 value = abs(val1) * int_pow(10, -exp);
148 value += abs(val2) / divisor;
149 } else {
150 divisor = int_pow(10, exp);
151 value = abs(val1) / divisor;
152 }
153 if (sign < 0)
154 value = ((1LL << (size * 8)) - value);
155
156 return value;
157}
158
159s32 hid_sensor_read_poll_value(struct hid_sensor_common *st)
160{
161 s32 value = 0;
162 int ret;
163
164 ret = sensor_hub_get_feature(st->hsdev,
165 st->poll.report_id,
166 st->poll.index, sizeof(value), &value);
167
168 if (ret < 0 || value < 0) {
169 return -EINVAL;
170 } else {
171 if (st->poll.units == HID_USAGE_SENSOR_UNITS_SECOND)
172 value = value * 1000;
173 }
174
175 return value;
176}
177EXPORT_SYMBOL(hid_sensor_read_poll_value);
178
179int hid_sensor_read_samp_freq_value(struct hid_sensor_common *st,
180 int *val1, int *val2)
181{
182 s32 value;
183 int ret;
184
185 ret = sensor_hub_get_feature(st->hsdev,
186 st->poll.report_id,
187 st->poll.index, sizeof(value), &value);
188 if (ret < 0 || value < 0) {
189 *val1 = *val2 = 0;
190 return -EINVAL;
191 } else {
192 if (st->poll.units == HID_USAGE_SENSOR_UNITS_MILLISECOND)
193 simple_div(1000, value, val1, val2);
194 else if (st->poll.units == HID_USAGE_SENSOR_UNITS_SECOND)
195 simple_div(1, value, val1, val2);
196 else {
197 *val1 = *val2 = 0;
198 return -EINVAL;
199 }
200 }
201
202 return IIO_VAL_INT_PLUS_MICRO;
203}
204EXPORT_SYMBOL(hid_sensor_read_samp_freq_value);
205
206int hid_sensor_write_samp_freq_value(struct hid_sensor_common *st,
207 int val1, int val2)
208{
209 s32 value;
210 int ret;
211
212 if (val1 < 0 || val2 < 0)
213 return -EINVAL;
214
215 value = val1 * HZ_PER_MHZ + val2;
216 if (value) {
217 if (st->poll.units == HID_USAGE_SENSOR_UNITS_MILLISECOND)
218 value = NSEC_PER_SEC / value;
219 else if (st->poll.units == HID_USAGE_SENSOR_UNITS_SECOND)
220 value = USEC_PER_SEC / value;
221 else
222 value = 0;
223 }
224 ret = sensor_hub_set_feature(st->hsdev, st->poll.report_id,
225 st->poll.index, sizeof(value), &value);
226 if (ret < 0 || value < 0)
227 return -EINVAL;
228
229 ret = sensor_hub_get_feature(st->hsdev,
230 st->poll.report_id,
231 st->poll.index, sizeof(value), &value);
232 if (ret < 0 || value < 0)
233 return -EINVAL;
234
235 st->poll_interval = value;
236
237 return 0;
238}
239EXPORT_SYMBOL(hid_sensor_write_samp_freq_value);
240
241int hid_sensor_read_raw_hyst_value(struct hid_sensor_common *st,
242 int *val1, int *val2)
243{
244 s32 value;
245 int ret;
246
247 ret = sensor_hub_get_feature(st->hsdev,
248 st->sensitivity.report_id,
249 st->sensitivity.index, sizeof(value),
250 &value);
251 if (ret < 0 || value < 0) {
252 *val1 = *val2 = 0;
253 return -EINVAL;
254 } else {
255 convert_from_vtf_format(value, st->sensitivity.size,
256 st->sensitivity.unit_expo,
257 val1, val2);
258 }
259
260 return IIO_VAL_INT_PLUS_MICRO;
261}
262EXPORT_SYMBOL(hid_sensor_read_raw_hyst_value);
263
264int hid_sensor_write_raw_hyst_value(struct hid_sensor_common *st,
265 int val1, int val2)
266{
267 s32 value;
268 int ret;
269
270 if (val1 < 0 || val2 < 0)
271 return -EINVAL;
272
273 value = convert_to_vtf_format(st->sensitivity.size,
274 st->sensitivity.unit_expo,
275 val1, val2);
276 ret = sensor_hub_set_feature(st->hsdev, st->sensitivity.report_id,
277 st->sensitivity.index, sizeof(value),
278 &value);
279 if (ret < 0 || value < 0)
280 return -EINVAL;
281
282 ret = sensor_hub_get_feature(st->hsdev,
283 st->sensitivity.report_id,
284 st->sensitivity.index, sizeof(value),
285 &value);
286 if (ret < 0 || value < 0)
287 return -EINVAL;
288
289 st->raw_hystersis = value;
290
291 return 0;
292}
293EXPORT_SYMBOL(hid_sensor_write_raw_hyst_value);
294
295
296
297
298
299
300
301
302
303
304
305
306static void adjust_exponent_nano(int *val0, int *val1, int scale0,
307 int scale1, int exp)
308{
309 int divisor;
310 int i;
311 int x;
312 int res;
313 int rem;
314
315 if (exp > 0) {
316 *val0 = scale0 * int_pow(10, exp);
317 res = 0;
318 if (exp > 9) {
319 *val1 = 0;
320 return;
321 }
322 for (i = 0; i < exp; ++i) {
323 divisor = int_pow(10, 8 - i);
324 x = scale1 / divisor;
325 res += int_pow(10, exp - 1 - i) * x;
326 scale1 = scale1 % divisor;
327 }
328 *val0 += res;
329 *val1 = scale1 * int_pow(10, exp);
330 } else if (exp < 0) {
331 exp = abs(exp);
332 if (exp > 9) {
333 *val0 = *val1 = 0;
334 return;
335 }
336 divisor = int_pow(10, exp);
337 *val0 = scale0 / divisor;
338 rem = scale0 % divisor;
339 res = 0;
340 for (i = 0; i < (9 - exp); ++i) {
341 divisor = int_pow(10, 8 - i);
342 x = scale1 / divisor;
343 res += int_pow(10, 8 - exp - i) * x;
344 scale1 = scale1 % divisor;
345 }
346 *val1 = rem * int_pow(10, 9 - exp) + res;
347 } else {
348 *val0 = scale0;
349 *val1 = scale1;
350 }
351}
352
353int hid_sensor_format_scale(u32 usage_id,
354 struct hid_sensor_hub_attribute_info *attr_info,
355 int *val0, int *val1)
356{
357 int i;
358 int exp;
359
360 *val0 = 1;
361 *val1 = 0;
362
363 for (i = 0; i < ARRAY_SIZE(unit_conversion); ++i) {
364 if (unit_conversion[i].usage_id == usage_id &&
365 unit_conversion[i].unit == attr_info->units) {
366 exp = hid_sensor_convert_exponent(
367 attr_info->unit_expo);
368 adjust_exponent_nano(val0, val1,
369 unit_conversion[i].scale_val0,
370 unit_conversion[i].scale_val1, exp);
371 break;
372 }
373 }
374
375 return IIO_VAL_INT_PLUS_NANO;
376}
377EXPORT_SYMBOL(hid_sensor_format_scale);
378
379int64_t hid_sensor_convert_timestamp(struct hid_sensor_common *st,
380 int64_t raw_value)
381{
382 return st->timestamp_ns_scale * raw_value;
383}
384EXPORT_SYMBOL(hid_sensor_convert_timestamp);
385
386static
387int hid_sensor_get_reporting_interval(struct hid_sensor_hub_device *hsdev,
388 u32 usage_id,
389 struct hid_sensor_common *st)
390{
391 sensor_hub_input_get_attribute_info(hsdev,
392 HID_FEATURE_REPORT, usage_id,
393 HID_USAGE_SENSOR_PROP_REPORT_INTERVAL,
394 &st->poll);
395
396 if (st->poll.units == 0)
397 st->poll.units = HID_USAGE_SENSOR_UNITS_MILLISECOND;
398
399 st->poll_interval = -1;
400
401 return 0;
402
403}
404
405static void hid_sensor_get_report_latency_info(struct hid_sensor_hub_device *hsdev,
406 u32 usage_id,
407 struct hid_sensor_common *st)
408{
409 sensor_hub_input_get_attribute_info(hsdev, HID_FEATURE_REPORT,
410 usage_id,
411 HID_USAGE_SENSOR_PROP_REPORT_LATENCY,
412 &st->report_latency);
413
414 hid_dbg(hsdev->hdev, "Report latency attributes: %x:%x\n",
415 st->report_latency.index, st->report_latency.report_id);
416}
417
418int hid_sensor_get_report_latency(struct hid_sensor_common *st)
419{
420 int ret;
421 int value;
422
423 ret = sensor_hub_get_feature(st->hsdev, st->report_latency.report_id,
424 st->report_latency.index, sizeof(value),
425 &value);
426 if (ret < 0)
427 return ret;
428
429 return value;
430}
431EXPORT_SYMBOL(hid_sensor_get_report_latency);
432
433int hid_sensor_set_report_latency(struct hid_sensor_common *st, int latency_ms)
434{
435 return sensor_hub_set_feature(st->hsdev, st->report_latency.report_id,
436 st->report_latency.index,
437 sizeof(latency_ms), &latency_ms);
438}
439EXPORT_SYMBOL(hid_sensor_set_report_latency);
440
441bool hid_sensor_batch_mode_supported(struct hid_sensor_common *st)
442{
443 return st->report_latency.index > 0 && st->report_latency.report_id > 0;
444}
445EXPORT_SYMBOL(hid_sensor_batch_mode_supported);
446
447int hid_sensor_parse_common_attributes(struct hid_sensor_hub_device *hsdev,
448 u32 usage_id,
449 struct hid_sensor_common *st)
450{
451
452 struct hid_sensor_hub_attribute_info timestamp;
453 s32 value;
454 int ret;
455
456 hid_sensor_get_reporting_interval(hsdev, usage_id, st);
457
458 sensor_hub_input_get_attribute_info(hsdev,
459 HID_FEATURE_REPORT, usage_id,
460 HID_USAGE_SENSOR_PROP_REPORT_STATE,
461 &st->report_state);
462
463 sensor_hub_input_get_attribute_info(hsdev,
464 HID_FEATURE_REPORT, usage_id,
465 HID_USAGE_SENSOR_PROY_POWER_STATE,
466 &st->power_state);
467
468 st->power_state.logical_minimum = 1;
469 st->report_state.logical_minimum = 1;
470
471 sensor_hub_input_get_attribute_info(hsdev,
472 HID_FEATURE_REPORT, usage_id,
473 HID_USAGE_SENSOR_PROP_SENSITIVITY_ABS,
474 &st->sensitivity);
475
476 st->raw_hystersis = -1;
477
478 sensor_hub_input_get_attribute_info(hsdev,
479 HID_INPUT_REPORT, usage_id,
480 HID_USAGE_SENSOR_TIME_TIMESTAMP,
481 ×tamp);
482 if (timestamp.index >= 0 && timestamp.report_id) {
483 int val0, val1;
484
485 hid_sensor_format_scale(HID_USAGE_SENSOR_TIME_TIMESTAMP,
486 ×tamp, &val0, &val1);
487 st->timestamp_ns_scale = val0;
488 } else
489 st->timestamp_ns_scale = 1000000000;
490
491 hid_sensor_get_report_latency_info(hsdev, usage_id, st);
492
493 hid_dbg(hsdev->hdev, "common attributes: %x:%x, %x:%x, %x:%x %x:%x %x:%x\n",
494 st->poll.index, st->poll.report_id,
495 st->report_state.index, st->report_state.report_id,
496 st->power_state.index, st->power_state.report_id,
497 st->sensitivity.index, st->sensitivity.report_id,
498 timestamp.index, timestamp.report_id);
499
500 ret = sensor_hub_get_feature(hsdev,
501 st->power_state.report_id,
502 st->power_state.index, sizeof(value), &value);
503 if (ret < 0)
504 return ret;
505 if (value < 0)
506 return -EINVAL;
507
508 return 0;
509}
510EXPORT_SYMBOL(hid_sensor_parse_common_attributes);
511
512MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
513MODULE_DESCRIPTION("HID Sensor common attribute processing");
514MODULE_LICENSE("GPL");
515
