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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 {HID_USAGE_SENSOR_HINGE, 0, 0, 17453293},
75 {HID_USAGE_SENSOR_HINGE, HID_USAGE_SENSOR_UNITS_DEGREES, 0, 17453293},
76};
77
78static void simple_div(int dividend, int divisor, int *whole,
79 int *micro_frac)
80{
81 int rem;
82 int exp = 0;
83
84 *micro_frac = 0;
85 if (divisor == 0) {
86 *whole = 0;
87 return;
88 }
89 *whole = dividend/divisor;
90 rem = dividend % divisor;
91 if (rem) {
92 while (rem <= divisor) {
93 rem *= 10;
94 exp++;
95 }
96 *micro_frac = (rem / divisor) * int_pow(10, 6 - exp);
97 }
98}
99
100static void split_micro_fraction(unsigned int no, int exp, int *val1, int *val2)
101{
102 int divisor = int_pow(10, exp);
103
104 *val1 = no / divisor;
105 *val2 = no % divisor * int_pow(10, 6 - exp);
106}
107
108
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114
115
116static void convert_from_vtf_format(u32 value, int size, int exp,
117 int *val1, int *val2)
118{
119 int sign = 1;
120
121 if (value & BIT(size*8 - 1)) {
122 value = ((1LL << (size * 8)) - value);
123 sign = -1;
124 }
125 exp = hid_sensor_convert_exponent(exp);
126 if (exp >= 0) {
127 *val1 = sign * value * int_pow(10, exp);
128 *val2 = 0;
129 } else {
130 split_micro_fraction(value, -exp, val1, val2);
131 if (*val1)
132 *val1 = sign * (*val1);
133 else
134 *val2 = sign * (*val2);
135 }
136}
137
138static u32 convert_to_vtf_format(int size, int exp, int val1, int val2)
139{
140 int divisor;
141 u32 value;
142 int sign = 1;
143
144 if (val1 < 0 || val2 < 0)
145 sign = -1;
146 exp = hid_sensor_convert_exponent(exp);
147 if (exp < 0) {
148 divisor = int_pow(10, 6 + exp);
149 value = abs(val1) * int_pow(10, -exp);
150 value += abs(val2) / divisor;
151 } else {
152 divisor = int_pow(10, exp);
153 value = abs(val1) / divisor;
154 }
155 if (sign < 0)
156 value = ((1LL << (size * 8)) - value);
157
158 return value;
159}
160
161s32 hid_sensor_read_poll_value(struct hid_sensor_common *st)
162{
163 s32 value = 0;
164 int ret;
165
166 ret = sensor_hub_get_feature(st->hsdev,
167 st->poll.report_id,
168 st->poll.index, sizeof(value), &value);
169
170 if (ret < 0 || value < 0) {
171 return -EINVAL;
172 } else {
173 if (st->poll.units == HID_USAGE_SENSOR_UNITS_SECOND)
174 value = value * 1000;
175 }
176
177 return value;
178}
179EXPORT_SYMBOL(hid_sensor_read_poll_value);
180
181int hid_sensor_read_samp_freq_value(struct hid_sensor_common *st,
182 int *val1, int *val2)
183{
184 s32 value;
185 int ret;
186
187 ret = sensor_hub_get_feature(st->hsdev,
188 st->poll.report_id,
189 st->poll.index, sizeof(value), &value);
190 if (ret < 0 || value < 0) {
191 *val1 = *val2 = 0;
192 return -EINVAL;
193 } else {
194 if (st->poll.units == HID_USAGE_SENSOR_UNITS_MILLISECOND)
195 simple_div(1000, value, val1, val2);
196 else if (st->poll.units == HID_USAGE_SENSOR_UNITS_SECOND)
197 simple_div(1, value, val1, val2);
198 else {
199 *val1 = *val2 = 0;
200 return -EINVAL;
201 }
202 }
203
204 return IIO_VAL_INT_PLUS_MICRO;
205}
206EXPORT_SYMBOL(hid_sensor_read_samp_freq_value);
207
208int hid_sensor_write_samp_freq_value(struct hid_sensor_common *st,
209 int val1, int val2)
210{
211 s32 value;
212 int ret;
213
214 if (val1 < 0 || val2 < 0)
215 return -EINVAL;
216
217 value = val1 * HZ_PER_MHZ + val2;
218 if (value) {
219 if (st->poll.units == HID_USAGE_SENSOR_UNITS_MILLISECOND)
220 value = NSEC_PER_SEC / value;
221 else if (st->poll.units == HID_USAGE_SENSOR_UNITS_SECOND)
222 value = USEC_PER_SEC / value;
223 else
224 value = 0;
225 }
226 ret = sensor_hub_set_feature(st->hsdev, st->poll.report_id,
227 st->poll.index, sizeof(value), &value);
228 if (ret < 0 || value < 0)
229 return -EINVAL;
230
231 ret = sensor_hub_get_feature(st->hsdev,
232 st->poll.report_id,
233 st->poll.index, sizeof(value), &value);
234 if (ret < 0 || value < 0)
235 return -EINVAL;
236
237 st->poll_interval = value;
238
239 return 0;
240}
241EXPORT_SYMBOL(hid_sensor_write_samp_freq_value);
242
243int hid_sensor_read_raw_hyst_value(struct hid_sensor_common *st,
244 int *val1, int *val2)
245{
246 s32 value;
247 int ret;
248
249 ret = sensor_hub_get_feature(st->hsdev,
250 st->sensitivity.report_id,
251 st->sensitivity.index, sizeof(value),
252 &value);
253 if (ret < 0 || value < 0) {
254 *val1 = *val2 = 0;
255 return -EINVAL;
256 } else {
257 convert_from_vtf_format(value, st->sensitivity.size,
258 st->sensitivity.unit_expo,
259 val1, val2);
260 }
261
262 return IIO_VAL_INT_PLUS_MICRO;
263}
264EXPORT_SYMBOL(hid_sensor_read_raw_hyst_value);
265
266int hid_sensor_write_raw_hyst_value(struct hid_sensor_common *st,
267 int val1, int val2)
268{
269 s32 value;
270 int ret;
271
272 if (val1 < 0 || val2 < 0)
273 return -EINVAL;
274
275 value = convert_to_vtf_format(st->sensitivity.size,
276 st->sensitivity.unit_expo,
277 val1, val2);
278 ret = sensor_hub_set_feature(st->hsdev, st->sensitivity.report_id,
279 st->sensitivity.index, sizeof(value),
280 &value);
281 if (ret < 0 || value < 0)
282 return -EINVAL;
283
284 ret = sensor_hub_get_feature(st->hsdev,
285 st->sensitivity.report_id,
286 st->sensitivity.index, sizeof(value),
287 &value);
288 if (ret < 0 || value < 0)
289 return -EINVAL;
290
291 st->raw_hystersis = value;
292
293 return 0;
294}
295EXPORT_SYMBOL(hid_sensor_write_raw_hyst_value);
296
297
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301
302
303
304
305
306
307
308static void adjust_exponent_nano(int *val0, int *val1, int scale0,
309 int scale1, int exp)
310{
311 int divisor;
312 int i;
313 int x;
314 int res;
315 int rem;
316
317 if (exp > 0) {
318 *val0 = scale0 * int_pow(10, exp);
319 res = 0;
320 if (exp > 9) {
321 *val1 = 0;
322 return;
323 }
324 for (i = 0; i < exp; ++i) {
325 divisor = int_pow(10, 8 - i);
326 x = scale1 / divisor;
327 res += int_pow(10, exp - 1 - i) * x;
328 scale1 = scale1 % divisor;
329 }
330 *val0 += res;
331 *val1 = scale1 * int_pow(10, exp);
332 } else if (exp < 0) {
333 exp = abs(exp);
334 if (exp > 9) {
335 *val0 = *val1 = 0;
336 return;
337 }
338 divisor = int_pow(10, exp);
339 *val0 = scale0 / divisor;
340 rem = scale0 % divisor;
341 res = 0;
342 for (i = 0; i < (9 - exp); ++i) {
343 divisor = int_pow(10, 8 - i);
344 x = scale1 / divisor;
345 res += int_pow(10, 8 - exp - i) * x;
346 scale1 = scale1 % divisor;
347 }
348 *val1 = rem * int_pow(10, 9 - exp) + res;
349 } else {
350 *val0 = scale0;
351 *val1 = scale1;
352 }
353}
354
355int hid_sensor_format_scale(u32 usage_id,
356 struct hid_sensor_hub_attribute_info *attr_info,
357 int *val0, int *val1)
358{
359 int i;
360 int exp;
361
362 *val0 = 1;
363 *val1 = 0;
364
365 for (i = 0; i < ARRAY_SIZE(unit_conversion); ++i) {
366 if (unit_conversion[i].usage_id == usage_id &&
367 unit_conversion[i].unit == attr_info->units) {
368 exp = hid_sensor_convert_exponent(
369 attr_info->unit_expo);
370 adjust_exponent_nano(val0, val1,
371 unit_conversion[i].scale_val0,
372 unit_conversion[i].scale_val1, exp);
373 break;
374 }
375 }
376
377 return IIO_VAL_INT_PLUS_NANO;
378}
379EXPORT_SYMBOL(hid_sensor_format_scale);
380
381int64_t hid_sensor_convert_timestamp(struct hid_sensor_common *st,
382 int64_t raw_value)
383{
384 return st->timestamp_ns_scale * raw_value;
385}
386EXPORT_SYMBOL(hid_sensor_convert_timestamp);
387
388static
389int hid_sensor_get_reporting_interval(struct hid_sensor_hub_device *hsdev,
390 u32 usage_id,
391 struct hid_sensor_common *st)
392{
393 sensor_hub_input_get_attribute_info(hsdev,
394 HID_FEATURE_REPORT, usage_id,
395 HID_USAGE_SENSOR_PROP_REPORT_INTERVAL,
396 &st->poll);
397
398 if (st->poll.units == 0)
399 st->poll.units = HID_USAGE_SENSOR_UNITS_MILLISECOND;
400
401 st->poll_interval = -1;
402
403 return 0;
404
405}
406
407static void hid_sensor_get_report_latency_info(struct hid_sensor_hub_device *hsdev,
408 u32 usage_id,
409 struct hid_sensor_common *st)
410{
411 sensor_hub_input_get_attribute_info(hsdev, HID_FEATURE_REPORT,
412 usage_id,
413 HID_USAGE_SENSOR_PROP_REPORT_LATENCY,
414 &st->report_latency);
415
416 hid_dbg(hsdev->hdev, "Report latency attributes: %x:%x\n",
417 st->report_latency.index, st->report_latency.report_id);
418}
419
420int hid_sensor_get_report_latency(struct hid_sensor_common *st)
421{
422 int ret;
423 int value;
424
425 ret = sensor_hub_get_feature(st->hsdev, st->report_latency.report_id,
426 st->report_latency.index, sizeof(value),
427 &value);
428 if (ret < 0)
429 return ret;
430
431 return value;
432}
433EXPORT_SYMBOL(hid_sensor_get_report_latency);
434
435int hid_sensor_set_report_latency(struct hid_sensor_common *st, int latency_ms)
436{
437 return sensor_hub_set_feature(st->hsdev, st->report_latency.report_id,
438 st->report_latency.index,
439 sizeof(latency_ms), &latency_ms);
440}
441EXPORT_SYMBOL(hid_sensor_set_report_latency);
442
443bool hid_sensor_batch_mode_supported(struct hid_sensor_common *st)
444{
445 return st->report_latency.index > 0 && st->report_latency.report_id > 0;
446}
447EXPORT_SYMBOL(hid_sensor_batch_mode_supported);
448
449int hid_sensor_parse_common_attributes(struct hid_sensor_hub_device *hsdev,
450 u32 usage_id,
451 struct hid_sensor_common *st)
452{
453
454 struct hid_sensor_hub_attribute_info timestamp;
455 s32 value;
456 int ret;
457
458 hid_sensor_get_reporting_interval(hsdev, usage_id, st);
459
460 sensor_hub_input_get_attribute_info(hsdev,
461 HID_FEATURE_REPORT, usage_id,
462 HID_USAGE_SENSOR_PROP_REPORT_STATE,
463 &st->report_state);
464
465 sensor_hub_input_get_attribute_info(hsdev,
466 HID_FEATURE_REPORT, usage_id,
467 HID_USAGE_SENSOR_PROY_POWER_STATE,
468 &st->power_state);
469
470 st->power_state.logical_minimum = 1;
471 st->report_state.logical_minimum = 1;
472
473 sensor_hub_input_get_attribute_info(hsdev,
474 HID_FEATURE_REPORT, usage_id,
475 HID_USAGE_SENSOR_PROP_SENSITIVITY_ABS,
476 &st->sensitivity);
477
478 st->raw_hystersis = -1;
479
480 sensor_hub_input_get_attribute_info(hsdev,
481 HID_INPUT_REPORT, usage_id,
482 HID_USAGE_SENSOR_TIME_TIMESTAMP,
483 ×tamp);
484 if (timestamp.index >= 0 && timestamp.report_id) {
485 int val0, val1;
486
487 hid_sensor_format_scale(HID_USAGE_SENSOR_TIME_TIMESTAMP,
488 ×tamp, &val0, &val1);
489 st->timestamp_ns_scale = val0;
490 } else
491 st->timestamp_ns_scale = 1000000000;
492
493 hid_sensor_get_report_latency_info(hsdev, usage_id, st);
494
495 hid_dbg(hsdev->hdev, "common attributes: %x:%x, %x:%x, %x:%x %x:%x %x:%x\n",
496 st->poll.index, st->poll.report_id,
497 st->report_state.index, st->report_state.report_id,
498 st->power_state.index, st->power_state.report_id,
499 st->sensitivity.index, st->sensitivity.report_id,
500 timestamp.index, timestamp.report_id);
501
502 ret = sensor_hub_get_feature(hsdev,
503 st->power_state.report_id,
504 st->power_state.index, sizeof(value), &value);
505 if (ret < 0)
506 return ret;
507 if (value < 0)
508 return -EINVAL;
509
510 return 0;
511}
512EXPORT_SYMBOL(hid_sensor_parse_common_attributes);
513
514MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
515MODULE_DESCRIPTION("HID Sensor common attribute processing");
516MODULE_LICENSE("GPL");
517
