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");