/* * 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 #include #include #include #include #include #include #include #include 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 nanos */ } unit_conversion[] = { {HID_USAGE_SENSOR_ACCEL_3D, 0, 9, 806650000}, {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, 806650000}, {HID_USAGE_SENSOR_GRAVITY_VECTOR, 0, 9, 806650000}, {HID_USAGE_SENSOR_GRAVITY_VECTOR, HID_USAGE_SENSOR_UNITS_METERS_PER_SEC_SQRD, 1, 0}, {HID_USAGE_SENSOR_GRAVITY_VECTOR, HID_USAGE_SENSOR_UNITS_G, 9, 806650000}, {HID_USAGE_SENSOR_GYRO_3D, 0, 0, 17453293}, {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, 17453293}, {HID_USAGE_SENSOR_COMPASS_3D, 0, 0, 1000000}, {HID_USAGE_SENSOR_COMPASS_3D, HID_USAGE_SENSOR_UNITS_GAUSS, 1, 0}, {HID_USAGE_SENSOR_INCLINOMETER_3D, 0, 0, 17453293}, {HID_USAGE_SENSOR_INCLINOMETER_3D, HID_USAGE_SENSOR_UNITS_DEGREES, 0, 17453293}, {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, 1000000}, {HID_USAGE_SENSOR_TIME_TIMESTAMP, 0, 1000000000, 0}, {HID_USAGE_SENSOR_TIME_TIMESTAMP, HID_USAGE_SENSOR_UNITS_MILLISECOND, 1000000, 0}, {HID_USAGE_SENSOR_TEMPERATURE, 0, 1000, 0}, {HID_USAGE_SENSOR_TEMPERATURE, HID_USAGE_SENSOR_UNITS_DEGREES, 1000, 0}, {HID_USAGE_SENSOR_HUMIDITY, 0, 1000, 0}, }; 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) return -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; ret = sensor_hub_get_feature(st->hsdev, st->poll.report_id, st->poll.index, sizeof(value), &value); if (ret < 0 || value < 0) return -EINVAL; st->poll_interval = value; return 0; } 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; if (val1 < 0 || val2 < 0) return -EINVAL; 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; ret = sensor_hub_get_feature(st->hsdev, st->sensitivity.report_id, st->sensitivity.index, sizeof(value), &value); if (ret < 0 || value < 0) return -EINVAL; st->raw_hystersis = value; return 0; } EXPORT_SYMBOL(hid_sensor_write_raw_hyst_value); /* * This fuction applies the unit exponent to the scale. * For example: * 9.806650000 ->exp:2-> val0[980]val1[665000000] * 9.000806000 ->exp:2-> val0[900]val1[80600000] * 0.174535293 ->exp:2-> val0[17]val1[453529300] * 1.001745329 ->exp:0-> val0[1]val1[1745329] * 1.001745329 ->exp:2-> val0[100]val1[174532900] * 1.001745329 ->exp:4-> val0[10017]val1[453290000] * 9.806650000 ->exp:-2-> val0[0]val1[98066500] */ static void adjust_exponent_nano(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 > 9) { *val1 = 0; return; } for (i = 0; i < exp; ++i) { x = scale1 / pow_10(8 - i); res += (pow_10(exp - 1 - i) * x); scale1 = scale1 % pow_10(8 - i); } *val0 += res; *val1 = scale1 * pow_10(exp); } else if (exp < 0) { exp = abs(exp); if (exp > 9) { *val0 = *val1 = 0; return; } *val0 = scale0 / pow_10(exp); rem = scale0 % pow_10(exp); res = 0; for (i = 0; i < (9 - exp); ++i) { x = scale1 / pow_10(8 - i); res += (pow_10(8 - exp - i) * x); scale1 = scale1 % pow_10(8 - i); } *val1 = rem * pow_10(9 - 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_nano(val0, val1, unit_conversion[i].scale_val0, unit_conversion[i].scale_val1, exp); break; } } return IIO_VAL_INT_PLUS_NANO; } EXPORT_SYMBOL(hid_sensor_format_scale); int64_t hid_sensor_convert_timestamp(struct hid_sensor_common *st, int64_t raw_value) { return st->timestamp_ns_scale * raw_value; } EXPORT_SYMBOL(hid_sensor_convert_timestamp); 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; st->poll_interval = -1; return 0; } int hid_sensor_parse_common_attributes(struct hid_sensor_hub_device *hsdev, u32 usage_id, struct hid_sensor_common *st) { struct hid_sensor_hub_attribute_info timestamp; s32 value; int ret; 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); 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_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(hid_sensor_parse_common_attributes); MODULE_AUTHOR("Srinivas Pandruvada "); MODULE_DESCRIPTION("HID Sensor common attribute processing"); MODULE_LICENSE("GPL");