| /* |
| * 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, 100000, 0}, |
| {HID_USAGE_SENSOR_PRESSURE, HID_USAGE_SENSOR_UNITS_PASCAL, 1, 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, &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, &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, 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, &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, 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"); |