1 files changed, 138 insertions, 0 deletions
diff --git a/drivers/iio/common/hid-sensors/hid-sensor-trigger.c b/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
new file mode 100644
index 00000000000..a3109a6f4d8
--- /dev/null
+++ b/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
@@ -0,0 +1,138 @@
+/*
+ * 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/trigger.h>
+#include <linux/iio/sysfs.h>
+#include "hid-sensor-trigger.h"
+
+int hid_sensor_power_state(struct hid_sensor_common *st, bool state)
+{
+	int state_val;
+	int report_val;
+
+	if (state) {
+		if (sensor_hub_device_open(st->hsdev))
+			return -EIO;
+
+		atomic_inc(&st->data_ready);
+
+		state_val = hid_sensor_get_usage_index(st->hsdev,
+			st->power_state.report_id,
+			st->power_state.index,
+			HID_USAGE_SENSOR_PROP_POWER_STATE_D0_FULL_POWER_ENUM);
+		report_val = hid_sensor_get_usage_index(st->hsdev,
+			st->report_state.report_id,
+			st->report_state.index,
+			HID_USAGE_SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM);
+	} else {
+		if (!atomic_dec_and_test(&st->data_ready))
+			return 0;
+		sensor_hub_device_close(st->hsdev);
+		state_val = hid_sensor_get_usage_index(st->hsdev,
+			st->power_state.report_id,
+			st->power_state.index,
+			HID_USAGE_SENSOR_PROP_POWER_STATE_D4_POWER_OFF_ENUM);
+		report_val = hid_sensor_get_usage_index(st->hsdev,
+			st->report_state.report_id,
+			st->report_state.index,
+			HID_USAGE_SENSOR_PROP_REPORTING_STATE_NO_EVENTS_ENUM);
+	}
+
+	if (state_val >= 0) {
+		state_val += st->power_state.logical_minimum;
+		sensor_hub_set_feature(st->hsdev, st->power_state.report_id,
+					st->power_state.index,
+					(s32)state_val);
+	}
+
+	if (report_val >= 0) {
+		report_val += st->report_state.logical_minimum;
+		sensor_hub_set_feature(st->hsdev, st->report_state.report_id,
+					st->report_state.index,
+					(s32)report_val);
+	}
+
+	sensor_hub_get_feature(st->hsdev, st->power_state.report_id,
+					st->power_state.index,
+					&state_val);
+	return 0;
+}
+EXPORT_SYMBOL(hid_sensor_power_state);
+
+static int hid_sensor_data_rdy_trigger_set_state(struct iio_trigger *trig,
+						bool state)
+{
+	return hid_sensor_power_state(iio_trigger_get_drvdata(trig), state);
+}
+
+void hid_sensor_remove_trigger(struct hid_sensor_common *attrb)
+{
+	iio_trigger_unregister(attrb->trigger);
+	iio_trigger_free(attrb->trigger);
+}
+EXPORT_SYMBOL(hid_sensor_remove_trigger);
+
+static const struct iio_trigger_ops hid_sensor_trigger_ops = {
+	.owner = THIS_MODULE,
+	.set_trigger_state = &hid_sensor_data_rdy_trigger_set_state,
+};
+
+int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name,
+				struct hid_sensor_common *attrb)
+{
+	int ret;
+	struct iio_trigger *trig;
+
+	trig = iio_trigger_alloc("%s-dev%d", name, indio_dev->id);
+	if (trig == NULL) {
+		dev_err(&indio_dev->dev, "Trigger Allocate Failed\n");
+		ret = -ENOMEM;
+		goto error_ret;
+	}
+
+	trig->dev.parent = indio_dev->dev.parent;
+	iio_trigger_set_drvdata(trig, attrb);
+	trig->ops = &hid_sensor_trigger_ops;
+	ret = iio_trigger_register(trig);
+
+	if (ret) {
+		dev_err(&indio_dev->dev, "Trigger Register Failed\n");
+		goto error_free_trig;
+	}
+	indio_dev->trig = attrb->trigger = trig;
+
+	return ret;
+
+error_free_trig:
+	iio_trigger_free(trig);
+error_ret:
+	return ret;
+}
+EXPORT_SYMBOL(hid_sensor_setup_trigger);
+
+MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
+MODULE_DESCRIPTION("HID Sensor trigger processing");
+MODULE_LICENSE("GPL");