summaryrefslogtreecommitdiff
path: root/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
blob: dc33c1dd5191a57aaa8c3c66cdaa75a31866463c (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
/*
 * HID Sensors Driver
 * Copyright (c) 2012, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 *
 */
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/hid-sensor-hub.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>

static struct {
	u32 usage_id;
	int unit; /* 0 for default others from HID sensor spec */
	int scale_val0; /* scale, whole number */
	int scale_val1; /* scale, fraction in micros */
} unit_conversion[] = {
	{HID_USAGE_SENSOR_ACCEL_3D, 0, 9, 806650},
	{HID_USAGE_SENSOR_ACCEL_3D,
		HID_USAGE_SENSOR_UNITS_METERS_PER_SEC_SQRD, 1, 0},
	{HID_USAGE_SENSOR_ACCEL_3D,
		HID_USAGE_SENSOR_UNITS_G, 9, 806650},

	{HID_USAGE_SENSOR_GYRO_3D, 0, 0, 17453},
	{HID_USAGE_SENSOR_GYRO_3D,
		HID_USAGE_SENSOR_UNITS_RADIANS_PER_SECOND, 1, 0},
	{HID_USAGE_SENSOR_GYRO_3D,
		HID_USAGE_SENSOR_UNITS_DEGREES_PER_SECOND, 0, 17453},

	{HID_USAGE_SENSOR_COMPASS_3D, 0, 0, 1000},
	{HID_USAGE_SENSOR_COMPASS_3D, HID_USAGE_SENSOR_UNITS_GAUSS, 1, 0},

	{HID_USAGE_SENSOR_INCLINOMETER_3D, 0, 0, 17453},
	{HID_USAGE_SENSOR_INCLINOMETER_3D,
		HID_USAGE_SENSOR_UNITS_DEGREES, 0, 17453},
	{HID_USAGE_SENSOR_INCLINOMETER_3D,
		HID_USAGE_SENSOR_UNITS_RADIANS, 1, 0},

	{HID_USAGE_SENSOR_ALS, 0, 1, 0},
	{HID_USAGE_SENSOR_ALS, HID_USAGE_SENSOR_UNITS_LUX, 1, 0},

	{HID_USAGE_SENSOR_PRESSURE, 0, 100, 0},
	{HID_USAGE_SENSOR_PRESSURE, HID_USAGE_SENSOR_UNITS_PASCAL, 0, 1000},
};

static int pow_10(unsigned power)
{
	int i;
	int ret = 1;
	for (i = 0; i < power; ++i)
		ret = ret * 10;

	return ret;
}

static void simple_div(int dividend, int divisor, int *whole,
				int *micro_frac)
{
	int rem;
	int exp = 0;

	*micro_frac = 0;
	if (divisor == 0) {
		*whole = 0;
		return;
	}
	*whole = dividend/divisor;
	rem = dividend % divisor;
	if (rem) {
		while (rem <= divisor) {
			rem *= 10;
			exp++;
		}
		*micro_frac = (rem / divisor) * pow_10(6-exp);
	}
}

static void split_micro_fraction(unsigned int no, int exp, int *val1, int *val2)
{
	*val1 = no/pow_10(exp);
	*val2 = no%pow_10(exp) * pow_10(6-exp);
}

/*
VTF format uses exponent and variable size format.
For example if the size is 2 bytes
0x0067 with VTF16E14 format -> +1.03
To convert just change to 0x67 to decimal and use two decimal as E14 stands
for 10^-2.
Negative numbers are 2's complement
*/
static void convert_from_vtf_format(u32 value, int size, int exp,
					int *val1, int *val2)
{
	int sign = 1;

	if (value & BIT(size*8 - 1)) {
		value =  ((1LL << (size * 8)) - value);
		sign = -1;
	}
	exp = hid_sensor_convert_exponent(exp);
	if (exp >= 0) {
		*val1 = sign * value * pow_10(exp);
		*val2 = 0;
	} else {
		split_micro_fraction(value, -exp, val1, val2);
		if (*val1)
			*val1 = sign * (*val1);
		else
			*val2 = sign * (*val2);
	}
}

static u32 convert_to_vtf_format(int size, int exp, int val1, int val2)
{
	u32 value;
	int sign = 1;

	if (val1 < 0 || val2 < 0)
		sign = -1;
	exp = hid_sensor_convert_exponent(exp);
	if (exp < 0) {
		value = abs(val1) * pow_10(-exp);
		value += abs(val2) / pow_10(6+exp);
	} else
		value = abs(val1) / pow_10(exp);
	if (sign < 0)
		value =  ((1LL << (size * 8)) - value);

	return value;
}

s32 hid_sensor_read_poll_value(struct hid_sensor_common *st)
{
	s32 value = 0;
	int ret;

	ret = sensor_hub_get_feature(st->hsdev,
				     st->poll.report_id,
				     st->poll.index, sizeof(value), &value);

	if (ret < 0 || value < 0) {
		return -EINVAL;
	} else {
		if (st->poll.units == HID_USAGE_SENSOR_UNITS_SECOND)
			value = value * 1000;
	}

	return value;
}
EXPORT_SYMBOL(hid_sensor_read_poll_value);

int hid_sensor_read_samp_freq_value(struct hid_sensor_common *st,
				int *val1, int *val2)
{
	s32 value;
	int ret;

	ret = sensor_hub_get_feature(st->hsdev,
				     st->poll.report_id,
				     st->poll.index, sizeof(value), &value);
	if (ret < 0 || value < 0) {
		*val1 = *val2 = 0;
		return -EINVAL;
	} else {
		if (st->poll.units == HID_USAGE_SENSOR_UNITS_MILLISECOND)
			simple_div(1000, value, val1, val2);
		else if (st->poll.units == HID_USAGE_SENSOR_UNITS_SECOND)
			simple_div(1, value, val1, val2);
		else {
			*val1 = *val2 = 0;
			return -EINVAL;
		}
	}

	return IIO_VAL_INT_PLUS_MICRO;
}
EXPORT_SYMBOL(hid_sensor_read_samp_freq_value);

int hid_sensor_write_samp_freq_value(struct hid_sensor_common *st,
				int val1, int val2)
{
	s32 value;
	int ret;

	if (val1 < 0 || val2 < 0)
		ret = -EINVAL;

	value = val1 * pow_10(6) + val2;
	if (value) {
		if (st->poll.units == HID_USAGE_SENSOR_UNITS_MILLISECOND)
			value = pow_10(9)/value;
		else if (st->poll.units == HID_USAGE_SENSOR_UNITS_SECOND)
			value = pow_10(6)/value;
		else
			value = 0;
	}
	ret = sensor_hub_set_feature(st->hsdev, st->poll.report_id,
				     st->poll.index, sizeof(value), &value);
	if (ret < 0 || value < 0)
		ret = -EINVAL;

	return ret;
}
EXPORT_SYMBOL(hid_sensor_write_samp_freq_value);

int hid_sensor_read_raw_hyst_value(struct hid_sensor_common *st,
				int *val1, int *val2)
{
	s32 value;
	int ret;

	ret = sensor_hub_get_feature(st->hsdev,
				     st->sensitivity.report_id,
				     st->sensitivity.index, sizeof(value),
				     &value);
	if (ret < 0 || value < 0) {
		*val1 = *val2 = 0;
		return -EINVAL;
	} else {
		convert_from_vtf_format(value, st->sensitivity.size,
					st->sensitivity.unit_expo,
					val1, val2);
	}

	return IIO_VAL_INT_PLUS_MICRO;
}
EXPORT_SYMBOL(hid_sensor_read_raw_hyst_value);

int hid_sensor_write_raw_hyst_value(struct hid_sensor_common *st,
					int val1, int val2)
{
	s32 value;
	int ret;

	value = convert_to_vtf_format(st->sensitivity.size,
				st->sensitivity.unit_expo,
				val1, val2);
	ret = sensor_hub_set_feature(st->hsdev, st->sensitivity.report_id,
				     st->sensitivity.index, sizeof(value),
				     &value);
	if (ret < 0 || value < 0)
		ret = -EINVAL;

	return ret;
}
EXPORT_SYMBOL(hid_sensor_write_raw_hyst_value);

/*
 * This fuction applies the unit exponent to the scale.
 * For example:
 * 9.806650 ->exp:2-> val0[980]val1[665000]
 * 9.000806 ->exp:2-> val0[900]val1[80600]
 * 0.174535 ->exp:2-> val0[17]val1[453500]
 * 1.001745 ->exp:0-> val0[1]val1[1745]
 * 1.001745 ->exp:2-> val0[100]val1[174500]
 * 1.001745 ->exp:4-> val0[10017]val1[450000]
 * 9.806650 ->exp:-2-> val0[0]val1[98066]
 */
static void adjust_exponent_micro(int *val0, int *val1, int scale0,
				  int scale1, int exp)
{
	int i;
	int x;
	int res;
	int rem;

	if (exp > 0) {
		*val0 = scale0 * pow_10(exp);
		res = 0;
		if (exp > 6) {
			*val1 = 0;
			return;
		}
		for (i = 0; i < exp; ++i) {
			x = scale1 / pow_10(5 - i);
			res += (pow_10(exp - 1 - i) * x);
			scale1 = scale1 % pow_10(5 - i);
		}
		*val0 += res;
			*val1 = scale1 * pow_10(exp);
	} else if (exp < 0) {
		exp = abs(exp);
		if (exp > 6) {
			*val0 = *val1 = 0;
			return;
		}
		*val0 = scale0 / pow_10(exp);
		rem = scale0 % pow_10(exp);
		res = 0;
		for (i = 0; i < (6 - exp); ++i) {
			x = scale1 / pow_10(5 - i);
			res += (pow_10(5 - exp - i) * x);
			scale1 = scale1 % pow_10(5 - i);
		}
		*val1 = rem * pow_10(6 - exp) + res;
	} else {
		*val0 = scale0;
		*val1 = scale1;
	}
}

int hid_sensor_format_scale(u32 usage_id,
			struct hid_sensor_hub_attribute_info *attr_info,
			int *val0, int *val1)
{
	int i;
	int exp;

	*val0 = 1;
	*val1 = 0;

	for (i = 0; i < ARRAY_SIZE(unit_conversion); ++i) {
		if (unit_conversion[i].usage_id == usage_id &&
			unit_conversion[i].unit == attr_info->units) {
			exp  = hid_sensor_convert_exponent(
						attr_info->unit_expo);
			adjust_exponent_micro(val0, val1,
					unit_conversion[i].scale_val0,
					unit_conversion[i].scale_val1, exp);
			break;
		}
	}

	return IIO_VAL_INT_PLUS_MICRO;
}
EXPORT_SYMBOL(hid_sensor_format_scale);

static
int hid_sensor_get_reporting_interval(struct hid_sensor_hub_device *hsdev,
					u32 usage_id,
					struct hid_sensor_common *st)
{
	sensor_hub_input_get_attribute_info(hsdev,
					HID_FEATURE_REPORT, usage_id,
					HID_USAGE_SENSOR_PROP_REPORT_INTERVAL,
					&st->poll);
	/* Default unit of measure is milliseconds */
	if (st->poll.units == 0)
		st->poll.units = HID_USAGE_SENSOR_UNITS_MILLISECOND;
	return 0;

}

int hid_sensor_parse_common_attributes(struct hid_sensor_hub_device *hsdev,
					u32 usage_id,
					struct hid_sensor_common *st)
{


	hid_sensor_get_reporting_interval(hsdev, usage_id, st);

	sensor_hub_input_get_attribute_info(hsdev,
					HID_FEATURE_REPORT, usage_id,
					HID_USAGE_SENSOR_PROP_REPORT_STATE,
					&st->report_state);

	sensor_hub_input_get_attribute_info(hsdev,
					HID_FEATURE_REPORT, usage_id,
					HID_USAGE_SENSOR_PROY_POWER_STATE,
					&st->power_state);

	sensor_hub_input_get_attribute_info(hsdev,
			HID_FEATURE_REPORT, usage_id,
			HID_USAGE_SENSOR_PROP_SENSITIVITY_ABS,
			 &st->sensitivity);

	hid_dbg(hsdev->hdev, "common attributes: %x:%x, %x:%x, %x:%x %x:%x\n",
			st->poll.index, st->poll.report_id,
			st->report_state.index, st->report_state.report_id,
			st->power_state.index, st->power_state.report_id,
			st->sensitivity.index, st->sensitivity.report_id);

	return 0;
}
EXPORT_SYMBOL(hid_sensor_parse_common_attributes);

MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
MODULE_DESCRIPTION("HID Sensor common attribute processing");
MODULE_LICENSE("GPL");