1 files changed, 419 insertions, 0 deletions

diff --git a/drivers/iio/accel/hid-sensor-accel-3d.c b/drivers/iio/accel/hid-sensor-accel-3d.c
new file mode 100644
index 0000000..33aa97c
--- /dev/null
+++ b/drivers/iio/accel/hid-sensor-accel-3d.c
@@ -0,0 +1,419 @@
+/*
+ * 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 <linux/iio/buffer.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+#include "../common/hid-sensors/hid-sensor-attributes.h"
+#include "../common/hid-sensors/hid-sensor-trigger.h"
+
+/*Format: HID-SENSOR-usage_id_in_hex*/
+/*Usage ID from spec for Accelerometer-3D: 0x200073*/
+#define DRIVER_NAME "HID-SENSOR-200073"
+
+enum accel_3d_channel {
+	CHANNEL_SCAN_INDEX_X,
+	CHANNEL_SCAN_INDEX_Y,
+	CHANNEL_SCAN_INDEX_Z,
+	ACCEL_3D_CHANNEL_MAX,
+};
+
+struct accel_3d_state {
+	struct hid_sensor_hub_callbacks callbacks;
+	struct hid_sensor_iio_common common_attributes;
+	struct hid_sensor_hub_attribute_info accel[ACCEL_3D_CHANNEL_MAX];
+	u32 accel_val[ACCEL_3D_CHANNEL_MAX];
+};
+
+static const u32 accel_3d_addresses[ACCEL_3D_CHANNEL_MAX] = {
+	HID_USAGE_SENSOR_ACCEL_X_AXIS,
+	HID_USAGE_SENSOR_ACCEL_Y_AXIS,
+	HID_USAGE_SENSOR_ACCEL_Z_AXIS
+};
+
+/* Channel definitions */
+static const struct iio_chan_spec accel_3d_channels[] = {
+	{
+		.type = IIO_ACCEL,
+		.modified = 1,
+		.channel2 = IIO_MOD_X,
+		.info_mask = IIO_CHAN_INFO_OFFSET_SHARED_BIT |
+		IIO_CHAN_INFO_SCALE_SHARED_BIT |
+		IIO_CHAN_INFO_SAMP_FREQ_SHARED_BIT |
+		IIO_CHAN_INFO_HYSTERESIS_SHARED_BIT,
+		.scan_index = CHANNEL_SCAN_INDEX_X,
+	}, {
+		.type = IIO_ACCEL,
+		.modified = 1,
+		.channel2 = IIO_MOD_Y,
+		.info_mask = IIO_CHAN_INFO_OFFSET_SHARED_BIT |
+		IIO_CHAN_INFO_SCALE_SHARED_BIT |
+		IIO_CHAN_INFO_SAMP_FREQ_SHARED_BIT |
+		IIO_CHAN_INFO_HYSTERESIS_SHARED_BIT,
+		.scan_index = CHANNEL_SCAN_INDEX_Y,
+	}, {
+		.type = IIO_ACCEL,
+		.modified = 1,
+		.channel2 = IIO_MOD_Z,
+		.info_mask = IIO_CHAN_INFO_OFFSET_SHARED_BIT |
+		IIO_CHAN_INFO_SCALE_SHARED_BIT |
+		IIO_CHAN_INFO_SAMP_FREQ_SHARED_BIT |
+		IIO_CHAN_INFO_HYSTERESIS_SHARED_BIT,
+		.scan_index = CHANNEL_SCAN_INDEX_Z,
+	}
+};
+
+/* Adjust channel real bits based on report descriptor */
+static void accel_3d_adjust_channel_bit_mask(struct iio_chan_spec *channels,
+						int channel, int size)
+{
+	channels[channel].scan_type.sign = 's';
+	/* Real storage bits will change based on the report desc. */
+	channels[channel].scan_type.realbits = size * 8;
+	/* Maximum size of a sample to capture is u32 */
+	channels[channel].scan_type.storagebits = sizeof(u32) * 8;
+}
+
+/* Channel read_raw handler */
+static int accel_3d_read_raw(struct iio_dev *indio_dev,
+			      struct iio_chan_spec const *chan,
+			      int *val, int *val2,
+			      long mask)
+{
+	struct accel_3d_state *accel_state = iio_priv(indio_dev);
+	int report_id = -1;
+	u32 address;
+	int ret;
+	int ret_type;
+
+	*val = 0;
+	*val2 = 0;
+	switch (mask) {
+	case 0:
+		report_id = accel_state->accel[chan->scan_index].report_id;
+		address = accel_3d_addresses[chan->scan_index];
+		if (report_id >= 0)
+			*val = sensor_hub_input_attr_get_raw_value(
+				accel_state->common_attributes.hsdev,
+				HID_USAGE_SENSOR_ACCEL_3D, address,
+				report_id);
+		else {
+			*val = 0;
+			return -EINVAL;
+		}
+		ret_type = IIO_VAL_INT;
+		break;
+	case IIO_CHAN_INFO_SCALE:
+		*val = accel_state->accel[CHANNEL_SCAN_INDEX_X].units;
+		ret_type = IIO_VAL_INT;
+		break;
+	case IIO_CHAN_INFO_OFFSET:
+		*val = hid_sensor_convert_exponent(
+			accel_state->accel[CHANNEL_SCAN_INDEX_X].unit_expo);
+		ret_type = IIO_VAL_INT;
+		break;
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		ret = hid_sensor_read_samp_freq_value(
+			&accel_state->common_attributes, val, val2);
+		ret_type = IIO_VAL_INT_PLUS_MICRO;
+		break;
+	case IIO_CHAN_INFO_HYSTERESIS:
+		ret = hid_sensor_read_raw_hyst_value(
+			&accel_state->common_attributes, val, val2);
+		ret_type = IIO_VAL_INT_PLUS_MICRO;
+		break;
+	default:
+		ret_type = -EINVAL;
+		break;
+	}
+
+	return ret_type;
+}
+
+/* Channel write_raw handler */
+static int accel_3d_write_raw(struct iio_dev *indio_dev,
+			       struct iio_chan_spec const *chan,
+			       int val,
+			       int val2,
+			       long mask)
+{
+	struct accel_3d_state *accel_state = iio_priv(indio_dev);
+	int ret = 0;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		ret = hid_sensor_write_samp_freq_value(
+				&accel_state->common_attributes, val, val2);
+		break;
+	case IIO_CHAN_INFO_HYSTERESIS:
+		ret = hid_sensor_write_raw_hyst_value(
+				&accel_state->common_attributes, val, val2);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static int accel_3d_write_raw_get_fmt(struct iio_dev *indio_dev,
+			       struct iio_chan_spec const *chan,
+			       long mask)
+{
+	return IIO_VAL_INT_PLUS_MICRO;
+}
+
+static const struct iio_info accel_3d_info = {
+	.driver_module = THIS_MODULE,
+	.read_raw = &accel_3d_read_raw,
+	.write_raw = &accel_3d_write_raw,
+	.write_raw_get_fmt = &accel_3d_write_raw_get_fmt,
+};
+
+/* Function to push data to buffer */
+static void hid_sensor_push_data(struct iio_dev *indio_dev, u8 *data, int len)
+{
+	struct iio_buffer *buffer = indio_dev->buffer;
+	s64 timestamp = iio_get_time_ns();
+	int datum_sz;
+
+	dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
+	if (!buffer) {
+		dev_err(&indio_dev->dev, "Buffer == NULL\n");
+		return;
+	}
+	datum_sz = buffer->access->get_bytes_per_datum(buffer);
+	if (len > datum_sz) {
+		dev_err(&indio_dev->dev, "Datum size mismatch %d:%d\n", len,
+				datum_sz);
+		return;
+	}
+	buffer->access->store_to(buffer, (u8 *)data, timestamp);
+}
+
+/* Callback handler to send event after all samples are received and captured */
+static int accel_3d_proc_event(struct hid_sensor_hub_device *hsdev,
+				unsigned usage_id,
+				void *priv)
+{
+	struct iio_dev *indio_dev = platform_get_drvdata(priv);
+	struct accel_3d_state *accel_state = iio_priv(indio_dev);
+
+	dev_dbg(&indio_dev->dev, "accel_3d_proc_event [%d]\n",
+				accel_state->common_attributes.data_ready);
+	if (accel_state->common_attributes.data_ready)
+		hid_sensor_push_data(indio_dev,
+				(u8 *)accel_state->accel_val,
+				sizeof(accel_state->accel_val));
+
+	return 0;
+}
+
+/* Capture samples in local storage */
+static int accel_3d_capture_sample(struct hid_sensor_hub_device *hsdev,
+				unsigned usage_id,
+				size_t raw_len, char *raw_data,
+				void *priv)
+{
+	struct iio_dev *indio_dev = platform_get_drvdata(priv);
+	struct accel_3d_state *accel_state = iio_priv(indio_dev);
+	int offset;
+	int ret = -EINVAL;
+
+	switch (usage_id) {
+	case HID_USAGE_SENSOR_ACCEL_X_AXIS:
+	case HID_USAGE_SENSOR_ACCEL_Y_AXIS:
+	case HID_USAGE_SENSOR_ACCEL_Z_AXIS:
+		offset = usage_id - HID_USAGE_SENSOR_ACCEL_X_AXIS;
+		accel_state->accel_val[CHANNEL_SCAN_INDEX_X + offset] =
+						*(u32 *)raw_data;
+		ret = 0;
+	break;
+	default:
+		break;
+	}
+
+	return ret;
+}
+
+/* Parse report which is specific to an usage id*/
+static int accel_3d_parse_report(struct platform_device *pdev,
+				struct hid_sensor_hub_device *hsdev,
+				struct iio_chan_spec *channels,
+				unsigned usage_id,
+				struct accel_3d_state *st)
+{
+	int ret;
+	int i;
+
+	for (i = 0; i <= CHANNEL_SCAN_INDEX_Z; ++i) {
+		ret = sensor_hub_input_get_attribute_info(hsdev,
+				HID_INPUT_REPORT,
+				usage_id,
+				HID_USAGE_SENSOR_ACCEL_X_AXIS + i,
+				&st->accel[CHANNEL_SCAN_INDEX_X + i]);
+		if (ret < 0)
+			break;
+		accel_3d_adjust_channel_bit_mask(channels,
+				CHANNEL_SCAN_INDEX_X + i,
+				st->accel[CHANNEL_SCAN_INDEX_X + i].size);
+	}
+	dev_dbg(&pdev->dev, "accel_3d %x:%x, %x:%x, %x:%x\n",
+			st->accel[0].index,
+			st->accel[0].report_id,
+			st->accel[1].index, st->accel[1].report_id,
+			st->accel[2].index, st->accel[2].report_id);
+
+	return ret;
+}
+
+/* Function to initialize the processing for usage id */
+static int __devinit hid_accel_3d_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+	static const char *name = "accel_3d";
+	struct iio_dev *indio_dev;
+	struct accel_3d_state *accel_state;
+	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
+	struct iio_chan_spec *channels;
+
+	indio_dev = iio_device_alloc(sizeof(struct accel_3d_state));
+	if (indio_dev == NULL) {
+		ret = -ENOMEM;
+		goto error_ret;
+	}
+	platform_set_drvdata(pdev, indio_dev);
+
+	accel_state = iio_priv(indio_dev);
+	accel_state->common_attributes.hsdev = hsdev;
+	accel_state->common_attributes.pdev = pdev;
+
+	ret = hid_sensor_parse_common_attributes(hsdev,
+					HID_USAGE_SENSOR_ACCEL_3D,
+					&accel_state->common_attributes);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to setup common attributes\n");
+		goto error_free_dev;
+	}
+
+	channels = kmemdup(accel_3d_channels,
+					sizeof(accel_3d_channels),
+					GFP_KERNEL);
+	if (!channels) {
+		dev_err(&pdev->dev, "failed to duplicate channels\n");
+		goto error_free_dev;
+	}
+
+	ret = accel_3d_parse_report(pdev, hsdev, channels,
+					HID_USAGE_SENSOR_ACCEL_3D, accel_state);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to setup attributes\n");
+		goto error_free_dev_mem;
+	}
+
+	indio_dev->channels = channels;
+	indio_dev->num_channels = ARRAY_SIZE(accel_3d_channels);
+	indio_dev->dev.parent = &pdev->dev;
+	indio_dev->info = &accel_3d_info;
+	indio_dev->name = name;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+
+	ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
+		NULL, NULL);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
+		goto error_free_dev_mem;
+	}
+	accel_state->common_attributes.data_ready = false;
+	ret = hid_sensor_setup_trigger(indio_dev, name,
+					&accel_state->common_attributes);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "trigger setup failed\n");
+		goto error_unreg_buffer_funcs;
+	}
+
+	ret = iio_device_register(indio_dev);
+	if (ret) {
+		dev_err(&pdev->dev, "device register failed\n");
+		goto error_remove_trigger;
+	}
+
+	accel_state->callbacks.send_event = accel_3d_proc_event;
+	accel_state->callbacks.capture_sample = accel_3d_capture_sample;
+	accel_state->callbacks.pdev = pdev;
+	ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_ACCEL_3D,
+					&accel_state->callbacks);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "callback reg failed\n");
+		goto error_iio_unreg;
+	}
+
+	return ret;
+
+error_iio_unreg:
+	iio_device_unregister(indio_dev);
+error_remove_trigger:
+	hid_sensor_remove_trigger(indio_dev);
+error_unreg_buffer_funcs:
+	iio_triggered_buffer_cleanup(indio_dev);
+error_free_dev_mem:
+	kfree(indio_dev->channels);
+error_free_dev:
+	iio_device_free(indio_dev);
+error_ret:
+	return ret;
+}
+
+/* Function to deinitialize the processing for usage id */
+static int __devinit hid_accel_3d_remove(struct platform_device *pdev)
+{
+	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
+	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+
+	sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_ACCEL_3D);
+	iio_device_unregister(indio_dev);
+	hid_sensor_remove_trigger(indio_dev);
+	iio_triggered_buffer_cleanup(indio_dev);
+	kfree(indio_dev->channels);
+	iio_device_free(indio_dev);
+
+	return 0;
+}
+
+static struct platform_driver hid_accel_3d_platform_driver = {
+	.driver = {
+		.name	= DRIVER_NAME,
+		.owner	= THIS_MODULE,
+	},
+	.probe		= hid_accel_3d_probe,
+	.remove		= hid_accel_3d_remove,
+};
+module_platform_driver(hid_accel_3d_platform_driver);
+
+MODULE_DESCRIPTION("HID Sensor Accel 3D");
+MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
+MODULE_LICENSE("GPL");