diff options
Diffstat (limited to 'drivers/iio/common/hid-sensors/hid-sensor-attributes.c')
| -rw-r--r-- | drivers/iio/common/hid-sensors/hid-sensor-attributes.c | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c new file mode 100644 index 00000000000..75374955cab --- /dev/null +++ b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c @@ -0,0 +1,250 @@ +/* + * 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> +#include "hid-sensor-attributes.h" + +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; +} + +int hid_sensor_read_samp_freq_value(struct hid_sensor_iio_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_iio_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_iio_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_iio_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); + +int hid_sensor_parse_common_attributes(struct hid_sensor_hub_device *hsdev, + u32 usage_id, + struct hid_sensor_iio_common *st) +{ + + sensor_hub_input_get_attribute_info(hsdev, + HID_FEATURE_REPORT, usage_id, + HID_USAGE_SENSOR_PROP_REPORT_INTERVAL, + &st->poll); + + 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"); |