591 lines
15 KiB
C
591 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* HID Sensors Driver
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* Copyright (c) 2012, Intel Corporation.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/time.h>
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#include <linux/units.h>
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#include <linux/hid-sensor-hub.h>
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#include <linux/iio/iio.h>
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static struct {
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u32 usage_id;
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int unit; /* 0 for default others from HID sensor spec */
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int scale_val0; /* scale, whole number */
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int scale_val1; /* scale, fraction in nanos */
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} unit_conversion[] = {
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{HID_USAGE_SENSOR_ACCEL_3D, 0, 9, 806650000},
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{HID_USAGE_SENSOR_ACCEL_3D,
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HID_USAGE_SENSOR_UNITS_METERS_PER_SEC_SQRD, 1, 0},
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{HID_USAGE_SENSOR_ACCEL_3D,
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HID_USAGE_SENSOR_UNITS_G, 9, 806650000},
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{HID_USAGE_SENSOR_GRAVITY_VECTOR, 0, 9, 806650000},
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{HID_USAGE_SENSOR_GRAVITY_VECTOR,
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HID_USAGE_SENSOR_UNITS_METERS_PER_SEC_SQRD, 1, 0},
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{HID_USAGE_SENSOR_GRAVITY_VECTOR,
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HID_USAGE_SENSOR_UNITS_G, 9, 806650000},
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{HID_USAGE_SENSOR_GYRO_3D, 0, 0, 17453293},
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{HID_USAGE_SENSOR_GYRO_3D,
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HID_USAGE_SENSOR_UNITS_RADIANS_PER_SECOND, 1, 0},
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{HID_USAGE_SENSOR_GYRO_3D,
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HID_USAGE_SENSOR_UNITS_DEGREES_PER_SECOND, 0, 17453293},
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{HID_USAGE_SENSOR_COMPASS_3D, 0, 0, 1000000},
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{HID_USAGE_SENSOR_COMPASS_3D, HID_USAGE_SENSOR_UNITS_GAUSS, 1, 0},
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{HID_USAGE_SENSOR_INCLINOMETER_3D, 0, 0, 17453293},
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{HID_USAGE_SENSOR_INCLINOMETER_3D,
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HID_USAGE_SENSOR_UNITS_DEGREES, 0, 17453293},
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{HID_USAGE_SENSOR_INCLINOMETER_3D,
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HID_USAGE_SENSOR_UNITS_RADIANS, 1, 0},
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{HID_USAGE_SENSOR_ALS, 0, 1, 0},
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{HID_USAGE_SENSOR_ALS, HID_USAGE_SENSOR_UNITS_LUX, 1, 0},
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{HID_USAGE_SENSOR_PRESSURE, 0, 100, 0},
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{HID_USAGE_SENSOR_PRESSURE, HID_USAGE_SENSOR_UNITS_PASCAL, 0, 1000000},
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{HID_USAGE_SENSOR_TIME_TIMESTAMP, 0, 1000000000, 0},
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{HID_USAGE_SENSOR_TIME_TIMESTAMP, HID_USAGE_SENSOR_UNITS_MILLISECOND,
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1000000, 0},
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{HID_USAGE_SENSOR_DEVICE_ORIENTATION, 0, 1, 0},
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{HID_USAGE_SENSOR_RELATIVE_ORIENTATION, 0, 1, 0},
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{HID_USAGE_SENSOR_GEOMAGNETIC_ORIENTATION, 0, 1, 0},
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{HID_USAGE_SENSOR_TEMPERATURE, 0, 1000, 0},
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{HID_USAGE_SENSOR_TEMPERATURE, HID_USAGE_SENSOR_UNITS_DEGREES, 1000, 0},
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{HID_USAGE_SENSOR_HUMIDITY, 0, 1000, 0},
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{HID_USAGE_SENSOR_HINGE, 0, 0, 17453293},
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{HID_USAGE_SENSOR_HINGE, HID_USAGE_SENSOR_UNITS_DEGREES, 0, 17453293},
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};
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static void simple_div(int dividend, int divisor, int *whole,
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int *micro_frac)
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{
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int rem;
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int exp = 0;
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*micro_frac = 0;
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if (divisor == 0) {
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*whole = 0;
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return;
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}
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*whole = dividend/divisor;
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rem = dividend % divisor;
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if (rem) {
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while (rem <= divisor) {
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rem *= 10;
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exp++;
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}
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*micro_frac = (rem / divisor) * int_pow(10, 6 - exp);
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}
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}
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static void split_micro_fraction(unsigned int no, int exp, int *val1, int *val2)
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{
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int divisor = int_pow(10, exp);
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*val1 = no / divisor;
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*val2 = no % divisor * int_pow(10, 6 - exp);
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}
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/*
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VTF format uses exponent and variable size format.
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For example if the size is 2 bytes
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0x0067 with VTF16E14 format -> +1.03
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To convert just change to 0x67 to decimal and use two decimal as E14 stands
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for 10^-2.
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Negative numbers are 2's complement
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*/
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static void convert_from_vtf_format(u32 value, int size, int exp,
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int *val1, int *val2)
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{
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int sign = 1;
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if (value & BIT(size*8 - 1)) {
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value = ((1LL << (size * 8)) - value);
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sign = -1;
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}
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exp = hid_sensor_convert_exponent(exp);
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if (exp >= 0) {
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*val1 = sign * value * int_pow(10, exp);
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*val2 = 0;
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} else {
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split_micro_fraction(value, -exp, val1, val2);
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if (*val1)
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*val1 = sign * (*val1);
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else
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*val2 = sign * (*val2);
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}
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}
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static u32 convert_to_vtf_format(int size, int exp, int val1, int val2)
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{
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int divisor;
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u32 value;
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int sign = 1;
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if (val1 < 0 || val2 < 0)
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sign = -1;
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exp = hid_sensor_convert_exponent(exp);
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if (exp < 0) {
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divisor = int_pow(10, 6 + exp);
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value = abs(val1) * int_pow(10, -exp);
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value += abs(val2) / divisor;
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} else {
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divisor = int_pow(10, exp);
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value = abs(val1) / divisor;
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}
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if (sign < 0)
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value = ((1LL << (size * 8)) - value);
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return value;
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}
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s32 hid_sensor_read_poll_value(struct hid_sensor_common *st)
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{
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s32 value = 0;
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int ret;
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ret = sensor_hub_get_feature(st->hsdev,
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st->poll.report_id,
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st->poll.index, sizeof(value), &value);
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if (ret < 0 || value < 0) {
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return -EINVAL;
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} else {
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if (st->poll.units == HID_USAGE_SENSOR_UNITS_SECOND)
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value = value * 1000;
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}
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return value;
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}
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EXPORT_SYMBOL_NS(hid_sensor_read_poll_value, IIO_HID_ATTRIBUTES);
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int hid_sensor_read_samp_freq_value(struct hid_sensor_common *st,
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int *val1, int *val2)
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{
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s32 value;
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int ret;
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ret = sensor_hub_get_feature(st->hsdev,
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st->poll.report_id,
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st->poll.index, sizeof(value), &value);
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if (ret < 0 || value < 0) {
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*val1 = *val2 = 0;
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return -EINVAL;
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} else {
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if (st->poll.units == HID_USAGE_SENSOR_UNITS_MILLISECOND)
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simple_div(1000, value, val1, val2);
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else if (st->poll.units == HID_USAGE_SENSOR_UNITS_SECOND)
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simple_div(1, value, val1, val2);
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else {
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*val1 = *val2 = 0;
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return -EINVAL;
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}
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}
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return IIO_VAL_INT_PLUS_MICRO;
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}
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EXPORT_SYMBOL_NS(hid_sensor_read_samp_freq_value, IIO_HID);
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int hid_sensor_write_samp_freq_value(struct hid_sensor_common *st,
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int val1, int val2)
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{
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s32 value;
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int ret;
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if (val1 < 0 || val2 < 0)
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return -EINVAL;
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value = val1 * HZ_PER_MHZ + val2;
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if (value) {
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if (st->poll.units == HID_USAGE_SENSOR_UNITS_MILLISECOND)
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value = NSEC_PER_SEC / value;
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else if (st->poll.units == HID_USAGE_SENSOR_UNITS_SECOND)
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value = USEC_PER_SEC / value;
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else
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value = 0;
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}
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ret = sensor_hub_set_feature(st->hsdev, st->poll.report_id,
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st->poll.index, sizeof(value), &value);
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if (ret < 0 || value < 0)
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return -EINVAL;
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ret = sensor_hub_get_feature(st->hsdev,
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st->poll.report_id,
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st->poll.index, sizeof(value), &value);
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if (ret < 0 || value < 0)
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return -EINVAL;
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st->poll_interval = value;
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return 0;
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}
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EXPORT_SYMBOL_NS(hid_sensor_write_samp_freq_value, IIO_HID);
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int hid_sensor_read_raw_hyst_value(struct hid_sensor_common *st,
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int *val1, int *val2)
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{
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s32 value;
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int ret;
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ret = sensor_hub_get_feature(st->hsdev,
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st->sensitivity.report_id,
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st->sensitivity.index, sizeof(value),
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&value);
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if (ret < 0 || value < 0) {
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*val1 = *val2 = 0;
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return -EINVAL;
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} else {
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convert_from_vtf_format(value, st->sensitivity.size,
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st->sensitivity.unit_expo,
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val1, val2);
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}
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return IIO_VAL_INT_PLUS_MICRO;
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}
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EXPORT_SYMBOL_NS(hid_sensor_read_raw_hyst_value, IIO_HID);
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int hid_sensor_read_raw_hyst_rel_value(struct hid_sensor_common *st, int *val1,
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int *val2)
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{
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s32 value;
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int ret;
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ret = sensor_hub_get_feature(st->hsdev,
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st->sensitivity_rel.report_id,
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st->sensitivity_rel.index, sizeof(value),
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&value);
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if (ret < 0 || value < 0) {
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*val1 = *val2 = 0;
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return -EINVAL;
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}
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convert_from_vtf_format(value, st->sensitivity_rel.size,
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st->sensitivity_rel.unit_expo, val1, val2);
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return IIO_VAL_INT_PLUS_MICRO;
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}
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EXPORT_SYMBOL_NS(hid_sensor_read_raw_hyst_rel_value, IIO_HID);
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int hid_sensor_write_raw_hyst_value(struct hid_sensor_common *st,
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int val1, int val2)
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{
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s32 value;
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int ret;
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if (val1 < 0 || val2 < 0)
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return -EINVAL;
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value = convert_to_vtf_format(st->sensitivity.size,
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st->sensitivity.unit_expo,
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val1, val2);
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ret = sensor_hub_set_feature(st->hsdev, st->sensitivity.report_id,
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st->sensitivity.index, sizeof(value),
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&value);
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if (ret < 0 || value < 0)
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return -EINVAL;
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ret = sensor_hub_get_feature(st->hsdev,
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st->sensitivity.report_id,
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st->sensitivity.index, sizeof(value),
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&value);
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if (ret < 0 || value < 0)
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return -EINVAL;
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st->raw_hystersis = value;
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return 0;
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}
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EXPORT_SYMBOL_NS(hid_sensor_write_raw_hyst_value, IIO_HID);
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int hid_sensor_write_raw_hyst_rel_value(struct hid_sensor_common *st,
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int val1, int val2)
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{
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s32 value;
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int ret;
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if (val1 < 0 || val2 < 0)
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return -EINVAL;
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value = convert_to_vtf_format(st->sensitivity_rel.size,
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st->sensitivity_rel.unit_expo,
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val1, val2);
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ret = sensor_hub_set_feature(st->hsdev, st->sensitivity_rel.report_id,
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st->sensitivity_rel.index, sizeof(value),
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&value);
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if (ret < 0 || value < 0)
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return -EINVAL;
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ret = sensor_hub_get_feature(st->hsdev,
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st->sensitivity_rel.report_id,
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st->sensitivity_rel.index, sizeof(value),
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&value);
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if (ret < 0 || value < 0)
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return -EINVAL;
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st->raw_hystersis = value;
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return 0;
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}
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EXPORT_SYMBOL_NS(hid_sensor_write_raw_hyst_rel_value, IIO_HID);
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/*
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* This fuction applies the unit exponent to the scale.
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* For example:
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* 9.806650000 ->exp:2-> val0[980]val1[665000000]
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* 9.000806000 ->exp:2-> val0[900]val1[80600000]
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* 0.174535293 ->exp:2-> val0[17]val1[453529300]
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* 1.001745329 ->exp:0-> val0[1]val1[1745329]
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* 1.001745329 ->exp:2-> val0[100]val1[174532900]
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* 1.001745329 ->exp:4-> val0[10017]val1[453290000]
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* 9.806650000 ->exp:-2-> val0[0]val1[98066500]
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*/
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static void adjust_exponent_nano(int *val0, int *val1, int scale0,
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int scale1, int exp)
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{
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int divisor;
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int i;
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int x;
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int res;
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int rem;
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if (exp > 0) {
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*val0 = scale0 * int_pow(10, exp);
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res = 0;
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if (exp > 9) {
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*val1 = 0;
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return;
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}
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for (i = 0; i < exp; ++i) {
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divisor = int_pow(10, 8 - i);
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x = scale1 / divisor;
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res += int_pow(10, exp - 1 - i) * x;
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scale1 = scale1 % divisor;
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}
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*val0 += res;
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*val1 = scale1 * int_pow(10, exp);
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} else if (exp < 0) {
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exp = abs(exp);
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if (exp > 9) {
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*val0 = *val1 = 0;
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return;
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}
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divisor = int_pow(10, exp);
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*val0 = scale0 / divisor;
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rem = scale0 % divisor;
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res = 0;
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for (i = 0; i < (9 - exp); ++i) {
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divisor = int_pow(10, 8 - i);
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x = scale1 / divisor;
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res += int_pow(10, 8 - exp - i) * x;
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scale1 = scale1 % divisor;
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}
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*val1 = rem * int_pow(10, 9 - exp) + res;
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} else {
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*val0 = scale0;
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*val1 = scale1;
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}
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}
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int hid_sensor_format_scale(u32 usage_id,
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struct hid_sensor_hub_attribute_info *attr_info,
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int *val0, int *val1)
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{
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int i;
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int exp;
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*val0 = 1;
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*val1 = 0;
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for (i = 0; i < ARRAY_SIZE(unit_conversion); ++i) {
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if (unit_conversion[i].usage_id == usage_id &&
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unit_conversion[i].unit == attr_info->units) {
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exp = hid_sensor_convert_exponent(
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attr_info->unit_expo);
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adjust_exponent_nano(val0, val1,
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unit_conversion[i].scale_val0,
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unit_conversion[i].scale_val1, exp);
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break;
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}
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}
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return IIO_VAL_INT_PLUS_NANO;
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}
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EXPORT_SYMBOL_NS(hid_sensor_format_scale, IIO_HID);
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int64_t hid_sensor_convert_timestamp(struct hid_sensor_common *st,
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int64_t raw_value)
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{
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return st->timestamp_ns_scale * raw_value;
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}
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EXPORT_SYMBOL_NS(hid_sensor_convert_timestamp, IIO_HID);
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static
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int hid_sensor_get_reporting_interval(struct hid_sensor_hub_device *hsdev,
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u32 usage_id,
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struct hid_sensor_common *st)
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{
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sensor_hub_input_get_attribute_info(hsdev,
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HID_FEATURE_REPORT, usage_id,
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HID_USAGE_SENSOR_PROP_REPORT_INTERVAL,
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&st->poll);
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/* Default unit of measure is milliseconds */
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if (st->poll.units == 0)
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st->poll.units = HID_USAGE_SENSOR_UNITS_MILLISECOND;
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st->poll_interval = -1;
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return 0;
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}
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static void hid_sensor_get_report_latency_info(struct hid_sensor_hub_device *hsdev,
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u32 usage_id,
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struct hid_sensor_common *st)
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{
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sensor_hub_input_get_attribute_info(hsdev, HID_FEATURE_REPORT,
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usage_id,
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HID_USAGE_SENSOR_PROP_REPORT_LATENCY,
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&st->report_latency);
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hid_dbg(hsdev->hdev, "Report latency attributes: %x:%x\n",
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st->report_latency.index, st->report_latency.report_id);
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}
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int hid_sensor_get_report_latency(struct hid_sensor_common *st)
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{
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int ret;
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int value;
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ret = sensor_hub_get_feature(st->hsdev, st->report_latency.report_id,
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st->report_latency.index, sizeof(value),
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&value);
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if (ret < 0)
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return ret;
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return value;
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}
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EXPORT_SYMBOL_NS(hid_sensor_get_report_latency, IIO_HID_ATTRIBUTES);
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int hid_sensor_set_report_latency(struct hid_sensor_common *st, int latency_ms)
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{
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return sensor_hub_set_feature(st->hsdev, st->report_latency.report_id,
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st->report_latency.index,
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sizeof(latency_ms), &latency_ms);
|
|
}
|
|
EXPORT_SYMBOL_NS(hid_sensor_set_report_latency, IIO_HID_ATTRIBUTES);
|
|
|
|
bool hid_sensor_batch_mode_supported(struct hid_sensor_common *st)
|
|
{
|
|
return st->report_latency.index > 0 && st->report_latency.report_id > 0;
|
|
}
|
|
EXPORT_SYMBOL_NS(hid_sensor_batch_mode_supported, IIO_HID_ATTRIBUTES);
|
|
|
|
int hid_sensor_parse_common_attributes(struct hid_sensor_hub_device *hsdev,
|
|
u32 usage_id,
|
|
struct hid_sensor_common *st,
|
|
const u32 *sensitivity_addresses,
|
|
u32 sensitivity_addresses_len)
|
|
{
|
|
|
|
struct hid_sensor_hub_attribute_info timestamp;
|
|
s32 value;
|
|
int ret;
|
|
int i;
|
|
|
|
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);
|
|
|
|
st->power_state.logical_minimum = 1;
|
|
st->report_state.logical_minimum = 1;
|
|
|
|
sensor_hub_input_get_attribute_info(hsdev,
|
|
HID_FEATURE_REPORT, usage_id,
|
|
HID_USAGE_SENSOR_PROP_SENSITIVITY_ABS,
|
|
&st->sensitivity);
|
|
|
|
sensor_hub_input_get_attribute_info(hsdev,
|
|
HID_FEATURE_REPORT, usage_id,
|
|
HID_USAGE_SENSOR_PROP_SENSITIVITY_REL_PCT,
|
|
&st->sensitivity_rel);
|
|
/*
|
|
* Set Sensitivity field ids, when there is no individual modifier, will
|
|
* check absolute sensitivity and relative sensitivity of data field
|
|
*/
|
|
for (i = 0; i < sensitivity_addresses_len; i++) {
|
|
if (st->sensitivity.index < 0)
|
|
sensor_hub_input_get_attribute_info(
|
|
hsdev, HID_FEATURE_REPORT, usage_id,
|
|
HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
|
|
sensitivity_addresses[i],
|
|
&st->sensitivity);
|
|
|
|
if (st->sensitivity_rel.index < 0)
|
|
sensor_hub_input_get_attribute_info(
|
|
hsdev, HID_FEATURE_REPORT, usage_id,
|
|
HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_REL_PCT |
|
|
sensitivity_addresses[i],
|
|
&st->sensitivity_rel);
|
|
}
|
|
|
|
st->raw_hystersis = -1;
|
|
|
|
sensor_hub_input_get_attribute_info(hsdev,
|
|
HID_INPUT_REPORT, usage_id,
|
|
HID_USAGE_SENSOR_TIME_TIMESTAMP,
|
|
×tamp);
|
|
if (timestamp.index >= 0 && timestamp.report_id) {
|
|
int val0, val1;
|
|
|
|
hid_sensor_format_scale(HID_USAGE_SENSOR_TIME_TIMESTAMP,
|
|
×tamp, &val0, &val1);
|
|
st->timestamp_ns_scale = val0;
|
|
} else
|
|
st->timestamp_ns_scale = 1000000000;
|
|
|
|
hid_sensor_get_report_latency_info(hsdev, usage_id, st);
|
|
|
|
hid_dbg(hsdev->hdev, "common attributes: %x:%x, %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,
|
|
timestamp.index, timestamp.report_id);
|
|
|
|
ret = sensor_hub_get_feature(hsdev,
|
|
st->power_state.report_id,
|
|
st->power_state.index, sizeof(value), &value);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (value < 0)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_NS(hid_sensor_parse_common_attributes, IIO_HID);
|
|
|
|
MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
|
|
MODULE_DESCRIPTION("HID Sensor common attribute processing");
|
|
MODULE_LICENSE("GPL");
|