diff options
Diffstat (limited to 'kernel/drivers/iio/common/hid-sensors/hid-sensor-attributes.c')
| -rw-r--r-- | kernel/drivers/iio/common/hid-sensors/hid-sensor-attributes.c | 397 |
1 files changed, 397 insertions, 0 deletions
diff --git a/kernel/drivers/iio/common/hid-sensors/hid-sensor-attributes.c b/kernel/drivers/iio/common/hid-sensors/hid-sensor-attributes.c new file mode 100644 index 000000000..e81f43476 --- /dev/null +++ b/kernel/drivers/iio/common/hid-sensors/hid-sensor-attributes.c @@ -0,0 +1,397 @@ +/* + * 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, 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, 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"); |