iio: hid-sensors: Common attribute and trigger

This patch contains the common code, which is used by all HID sensors.
There are some common set of attributes, which every hid sensor
needs it. This patch contains all such attributes processing.
Also the trigger interface is common among all HID sensors. This
patch contains common trigger functions utilized by all HID sensors.

Signed-off-by: srinivas pandruvada <srinivas.pandruvada@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

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 000000000000..75374955caba
--- /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");