[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / hid / hid-sensor-hub.c

/*
 * 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/hid.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/mfd/core.h>
#include <linux/list.h>
#include <linux/hid-sensor-ids.h>
#include <linux/hid-sensor-hub.h>
#include "hid-ids.h"

/**
 * struct sensor_hub_pending - Synchronous read pending information
 * @status:		Pending status true/false.
 * @ready:		Completion synchronization data.
 * @usage_id:		Usage id for physical device, E.g. Gyro usage id.
 * @attr_usage_id:	Usage Id of a field, E.g. X-AXIS for a gyro.
 * @raw_size:		Response size for a read request.
 * @raw_data:		Place holder for received response.
 */
struct sensor_hub_pending {
	bool status;
	struct completion ready;
	u32 usage_id;
	u32 attr_usage_id;
	int raw_size;
	u8  *raw_data;
};

/**
 * struct sensor_hub_data - Hold a instance data for a HID hub device
 * @hsdev:		Stored hid instance for current hub device.
 * @mutex:		Mutex to serialize synchronous request.
 * @lock:		Spin lock to protect pending request structure.
 * @pending:		Holds information of pending sync read request.
 * @dyn_callback_list:	Holds callback function
 * @dyn_callback_lock:	spin lock to protect callback list
 * @hid_sensor_hub_client_devs:	Stores all MFD cells for a hub instance.
 * @hid_sensor_client_cnt: Number of MFD cells, (no of sensors attached).
 */
struct sensor_hub_data {
	struct hid_sensor_hub_device *hsdev;
	struct mutex mutex;
	spinlock_t lock;
	struct sensor_hub_pending pending;
	struct list_head dyn_callback_list;
	spinlock_t dyn_callback_lock;
	struct mfd_cell *hid_sensor_hub_client_devs;
	int hid_sensor_client_cnt;
};

/**
 * struct hid_sensor_hub_callbacks_list - Stores callback list
 * @list:		list head.
 * @usage_id:		usage id for a physical device.
 * @usage_callback:	Stores registered callback functions.
 * @priv:		Private data for a physical device.
 */
struct hid_sensor_hub_callbacks_list {
	struct list_head list;
	u32 usage_id;
	struct hid_sensor_hub_callbacks *usage_callback;
	void *priv;
};

static struct hid_report *sensor_hub_report(int id, struct hid_device *hdev,
						int dir)
{
	struct hid_report *report;

	list_for_each_entry(report, &hdev->report_enum[dir].report_list, list) {
		if (report->id == id)
			return report;
	}
	hid_warn(hdev, "No report with id 0x%x found\n", id);

	return NULL;
}

static int sensor_hub_get_physical_device_count(
				struct hid_report_enum *report_enum)
{
	struct hid_report *report;
	struct hid_field *field;
	int cnt = 0;

	list_for_each_entry(report, &report_enum->report_list, list) {
		field = report->field[0];
		if (report->maxfield && field &&
					field->physical)
			cnt++;
	}

	return cnt;
}

static void sensor_hub_fill_attr_info(
		struct hid_sensor_hub_attribute_info *info,
		s32 index, s32 report_id, s32 units, s32 unit_expo, s32 size)
{
	info->index = index;
	info->report_id = report_id;
	info->units = units;
	info->unit_expo = unit_expo;
	info->size = size/8;
}

static struct hid_sensor_hub_callbacks *sensor_hub_get_callback(
					struct hid_device *hdev,
					u32 usage_id, void **priv)
{
	struct hid_sensor_hub_callbacks_list *callback;
	struct sensor_hub_data *pdata = hid_get_drvdata(hdev);

	spin_lock(&pdata->dyn_callback_lock);
	list_for_each_entry(callback, &pdata->dyn_callback_list, list)
		if (callback->usage_id == usage_id) {
			*priv = callback->priv;
			spin_unlock(&pdata->dyn_callback_lock);
			return callback->usage_callback;
		}
	spin_unlock(&pdata->dyn_callback_lock);

	return NULL;
}

int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
			u32 usage_id,
			struct hid_sensor_hub_callbacks *usage_callback)
{
	struct hid_sensor_hub_callbacks_list *callback;
	struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);

	spin_lock(&pdata->dyn_callback_lock);
	list_for_each_entry(callback, &pdata->dyn_callback_list, list)
		if (callback->usage_id == usage_id) {
			spin_unlock(&pdata->dyn_callback_lock);
			return -EINVAL;
		}
	callback = kzalloc(sizeof(*callback), GFP_ATOMIC);
	if (!callback) {
		spin_unlock(&pdata->dyn_callback_lock);
		return -ENOMEM;
	}
	callback->usage_callback = usage_callback;
	callback->usage_id = usage_id;
	callback->priv = NULL;
	list_add_tail(&callback->list, &pdata->dyn_callback_list);
	spin_unlock(&pdata->dyn_callback_lock);

	return 0;
}
EXPORT_SYMBOL_GPL(sensor_hub_register_callback);

int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev,
				u32 usage_id)
{
	struct hid_sensor_hub_callbacks_list *callback;
	struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);

	spin_lock(&pdata->dyn_callback_lock);
	list_for_each_entry(callback, &pdata->dyn_callback_list, list)
		if (callback->usage_id == usage_id) {
			list_del(&callback->list);
			kfree(callback);
			break;
		}
	spin_unlock(&pdata->dyn_callback_lock);

	return 0;
}
EXPORT_SYMBOL_GPL(sensor_hub_remove_callback);

int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
				u32 field_index, s32 value)
{
	struct hid_report *report;
	struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
	int ret = 0;

	mutex_lock(&data->mutex);
	report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
	if (!report || (field_index >=  report->maxfield)) {
		ret = -EINVAL;
		goto done_proc;
	}
	hid_set_field(report->field[field_index], 0, value);
	hid_hw_request(hsdev->hdev, report, HID_REQ_SET_REPORT);
	hid_hw_wait(hsdev->hdev);

done_proc:
	mutex_unlock(&data->mutex);

	return ret;
}
EXPORT_SYMBOL_GPL(sensor_hub_set_feature);

int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
				u32 field_index, s32 *value)
{
	struct hid_report *report;
	struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
	int ret = 0;

	mutex_lock(&data->mutex);
	report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
	if (!report || (field_index >=  report->maxfield) ||
	    report->field[field_index]->report_count < 1) {
		ret = -EINVAL;
		goto done_proc;
	}
	hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
	hid_hw_wait(hsdev->hdev);
	*value = report->field[field_index]->value[0];

done_proc:
	mutex_unlock(&data->mutex);

	return ret;
}
EXPORT_SYMBOL_GPL(sensor_hub_get_feature);


int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
					u32 usage_id,
					u32 attr_usage_id, u32 report_id)
{
	struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
	unsigned long flags;
	struct hid_report *report;
	int ret_val = 0;

	mutex_lock(&data->mutex);
	memset(&data->pending, 0, sizeof(data->pending));
	init_completion(&data->pending.ready);
	data->pending.usage_id = usage_id;
	data->pending.attr_usage_id = attr_usage_id;
	data->pending.raw_size = 0;

	spin_lock_irqsave(&data->lock, flags);
	data->pending.status = true;
	report = sensor_hub_report(report_id, hsdev->hdev, HID_INPUT_REPORT);
	if (!report) {
		spin_unlock_irqrestore(&data->lock, flags);
		goto err_free;
	}
	hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
	spin_unlock_irqrestore(&data->lock, flags);
	wait_for_completion_interruptible_timeout(&data->pending.ready, HZ*5);
	switch (data->pending.raw_size) {
	case 1:
		ret_val = *(u8 *)data->pending.raw_data;
		break;
	case 2:
		ret_val = *(u16 *)data->pending.raw_data;
		break;
	case 4:
		ret_val = *(u32 *)data->pending.raw_data;
		break;
	default:
		ret_val = 0;
	}
	kfree(data->pending.raw_data);

err_free:
	data->pending.status = false;
	mutex_unlock(&data->mutex);

	return ret_val;
}
EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);

int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
				u8 type,
				u32 usage_id,
				u32 attr_usage_id,
				struct hid_sensor_hub_attribute_info *info)
{
	int ret = -1;
	int i, j;
	int collection_index = -1;
	struct hid_report *report;
	struct hid_field *field;
	struct hid_report_enum *report_enum;
	struct hid_device *hdev = hsdev->hdev;

	/* Initialize with defaults */
	info->usage_id = usage_id;
	info->attrib_id =  attr_usage_id;
	info->report_id = -1;
	info->index = -1;
	info->units = -1;
	info->unit_expo = -1;

	for (i = 0; i < hdev->maxcollection; ++i) {
		struct hid_collection *collection = &hdev->collection[i];
		if (usage_id == collection->usage) {
			collection_index = i;
			break;
		}
	}
	if (collection_index == -1)
		goto err_ret;

	report_enum = &hdev->report_enum[type];
	list_for_each_entry(report, &report_enum->report_list, list) {
		for (i = 0; i < report->maxfield; ++i) {
			field = report->field[i];
			if (field->physical == usage_id &&
				field->logical == attr_usage_id) {
				sensor_hub_fill_attr_info(info, i, report->id,
					field->unit, field->unit_exponent,
					field->report_size *
							field->report_count);
				ret = 0;
			} else {
				for (j = 0; j < field->maxusage; ++j) {
					if (field->usage[j].hid ==
					attr_usage_id &&
					field->usage[j].collection_index ==
					collection_index)  {
						sensor_hub_fill_attr_info(info,
							i, report->id,
							field->unit,
							field->unit_exponent,
							field->report_size *
							field->report_count);
						ret = 0;
						break;
					}
				}
			}
			if (ret == 0)
				break;
		}
	}

err_ret:
	return ret;
}
EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info);

#ifdef CONFIG_PM
static int sensor_hub_suspend(struct hid_device *hdev, pm_message_t message)
{
	struct sensor_hub_data *pdata =  hid_get_drvdata(hdev);
	struct hid_sensor_hub_callbacks_list *callback;

	hid_dbg(hdev, " sensor_hub_suspend\n");
	spin_lock(&pdata->dyn_callback_lock);
	list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
		if (callback->usage_callback->suspend)
			callback->usage_callback->suspend(
					pdata->hsdev, callback->priv);
	}
	spin_unlock(&pdata->dyn_callback_lock);

	return 0;
}

static int sensor_hub_resume(struct hid_device *hdev)
{
	struct sensor_hub_data *pdata =  hid_get_drvdata(hdev);
	struct hid_sensor_hub_callbacks_list *callback;

	hid_dbg(hdev, " sensor_hub_resume\n");
	spin_lock(&pdata->dyn_callback_lock);
	list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
		if (callback->usage_callback->resume)
			callback->usage_callback->resume(
					pdata->hsdev, callback->priv);
	}
	spin_unlock(&pdata->dyn_callback_lock);

	return 0;
}

static int sensor_hub_reset_resume(struct hid_device *hdev)
{
	return 0;
}
#endif
/*
 * Handle raw report as sent by device
 */
static int sensor_hub_raw_event(struct hid_device *hdev,
		struct hid_report *report, u8 *raw_data, int size)
{
	int i;
	u8 *ptr;
	int sz;
	struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
	unsigned long flags;
	struct hid_sensor_hub_callbacks *callback = NULL;
	struct hid_collection *collection = NULL;
	void *priv = NULL;

	hid_dbg(hdev, "sensor_hub_raw_event report id:0x%x size:%d type:%d\n",
			 report->id, size, report->type);
	hid_dbg(hdev, "maxfield:%d\n", report->maxfield);
	if (report->type != HID_INPUT_REPORT)
		return 1;

	ptr = raw_data;
	ptr++; /*Skip report id*/

	spin_lock_irqsave(&pdata->lock, flags);

	for (i = 0; i < report->maxfield; ++i) {

		hid_dbg(hdev, "%d collection_index:%x hid:%x sz:%x\n",
				i, report->field[i]->usage->collection_index,
				report->field[i]->usage->hid,
				(report->field[i]->report_size *
					report->field[i]->report_count)/8);
		sz = (report->field[i]->report_size *
					report->field[i]->report_count)/8;
		if (pdata->pending.status && pdata->pending.attr_usage_id ==
				report->field[i]->usage->hid) {
			hid_dbg(hdev, "data was pending ...\n");
			pdata->pending.raw_data = kmalloc(sz, GFP_ATOMIC);
			if (pdata->pending.raw_data) {
				memcpy(pdata->pending.raw_data, ptr, sz);
				pdata->pending.raw_size  = sz;
			} else
				pdata->pending.raw_size = 0;
			complete(&pdata->pending.ready);
		}
		collection = &hdev->collection[
				report->field[i]->usage->collection_index];
		hid_dbg(hdev, "collection->usage %x\n",
					collection->usage);
		callback = sensor_hub_get_callback(pdata->hsdev->hdev,
						report->field[i]->physical,
							&priv);
		if (callback && callback->capture_sample) {
			if (report->field[i]->logical)
				callback->capture_sample(pdata->hsdev,
					report->field[i]->logical, sz, ptr,
					callback->pdev);
			else
				callback->capture_sample(pdata->hsdev,
					report->field[i]->usage->hid, sz, ptr,
					callback->pdev);
		}
		ptr += sz;
	}
	if (callback && collection && callback->send_event)
		callback->send_event(pdata->hsdev, collection->usage,
				callback->pdev);
	spin_unlock_irqrestore(&pdata->lock, flags);

	return 1;
}

static int sensor_hub_probe(struct hid_device *hdev,
				const struct hid_device_id *id)
{
	int ret;
	struct sensor_hub_data *sd;
	int i;
	char *name;
	struct hid_report *report;
	struct hid_report_enum *report_enum;
	struct hid_field *field;
	int dev_cnt;

	sd = kzalloc(sizeof(struct sensor_hub_data), GFP_KERNEL);
	if (!sd) {
		hid_err(hdev, "cannot allocate Sensor data\n");
		return -ENOMEM;
	}
	sd->hsdev = kzalloc(sizeof(struct hid_sensor_hub_device), GFP_KERNEL);
	if (!sd->hsdev) {
		hid_err(hdev, "cannot allocate hid_sensor_hub_device\n");
		ret = -ENOMEM;
		goto err_free_hub;
	}
	hid_set_drvdata(hdev, sd);
	sd->hsdev->hdev = hdev;
	sd->hsdev->vendor_id = hdev->vendor;
	sd->hsdev->product_id = hdev->product;
	spin_lock_init(&sd->lock);
	spin_lock_init(&sd->dyn_callback_lock);
	mutex_init(&sd->mutex);
	ret = hid_parse(hdev);
	if (ret) {
		hid_err(hdev, "parse failed\n");
		goto err_free;
	}
	INIT_LIST_HEAD(&hdev->inputs);

	ret = hid_hw_start(hdev, 0);
	if (ret) {
		hid_err(hdev, "hw start failed\n");
		goto err_free;
	}
	ret = hid_hw_open(hdev);
	if (ret) {
		hid_err(hdev, "failed to open input interrupt pipe\n");
		goto err_stop_hw;
	}

	INIT_LIST_HEAD(&sd->dyn_callback_list);
	sd->hid_sensor_client_cnt = 0;
	report_enum = &hdev->report_enum[HID_INPUT_REPORT];

	dev_cnt = sensor_hub_get_physical_device_count(report_enum);
	if (dev_cnt > HID_MAX_PHY_DEVICES) {
		hid_err(hdev, "Invalid Physical device count\n");
		ret = -EINVAL;
		goto err_close;
	}
	sd->hid_sensor_hub_client_devs = kzalloc(dev_cnt *
						sizeof(struct mfd_cell),
						GFP_KERNEL);
	if (sd->hid_sensor_hub_client_devs == NULL) {
		hid_err(hdev, "Failed to allocate memory for mfd cells\n");
			ret = -ENOMEM;
			goto err_close;
	}
	list_for_each_entry(report, &report_enum->report_list, list) {
		hid_dbg(hdev, "Report id:%x\n", report->id);
		field = report->field[0];
		if (report->maxfield && field &&
					field->physical) {
			name = kasprintf(GFP_KERNEL, "HID-SENSOR-%x",
						field->physical);
			if (name  == NULL) {
				hid_err(hdev, "Failed MFD device name\n");
					ret = -ENOMEM;
					goto err_free_names;
			}
			sd->hid_sensor_hub_client_devs[
				sd->hid_sensor_client_cnt].name = name;
			sd->hid_sensor_hub_client_devs[
				sd->hid_sensor_client_cnt].platform_data =
						sd->hsdev;
			sd->hid_sensor_hub_client_devs[
				sd->hid_sensor_client_cnt].pdata_size =
						sizeof(*sd->hsdev);
			hid_dbg(hdev, "Adding %s:%p\n", name, sd);
			sd->hid_sensor_client_cnt++;
		}
	}
	ret = mfd_add_devices(&hdev->dev, 0, sd->hid_sensor_hub_client_devs,
		sd->hid_sensor_client_cnt, NULL, 0, NULL);
	if (ret < 0)
		goto err_free_names;

	return ret;

err_free_names:
	for (i = 0; i < sd->hid_sensor_client_cnt ; ++i)
		kfree(sd->hid_sensor_hub_client_devs[i].name);
	kfree(sd->hid_sensor_hub_client_devs);
err_close:
	hid_hw_close(hdev);
err_stop_hw:
	hid_hw_stop(hdev);
err_free:
	kfree(sd->hsdev);
err_free_hub:
	kfree(sd);

	return ret;
}

static void sensor_hub_remove(struct hid_device *hdev)
{
	struct sensor_hub_data *data = hid_get_drvdata(hdev);
	unsigned long flags;
	int i;

	hid_dbg(hdev, " hardware removed\n");
	hid_hw_close(hdev);
	hid_hw_stop(hdev);
	spin_lock_irqsave(&data->lock, flags);
	if (data->pending.status)
		complete(&data->pending.ready);
	spin_unlock_irqrestore(&data->lock, flags);
	mfd_remove_devices(&hdev->dev);
	for (i = 0; i < data->hid_sensor_client_cnt ; ++i)
		kfree(data->hid_sensor_hub_client_devs[i].name);
	kfree(data->hid_sensor_hub_client_devs);
	hid_set_drvdata(hdev, NULL);
	mutex_destroy(&data->mutex);
	kfree(data->hsdev);
	kfree(data);
}

static const struct hid_device_id sensor_hub_devices[] = {
	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, HID_ANY_ID,
		     HID_ANY_ID) },
	{ }
};
MODULE_DEVICE_TABLE(hid, sensor_hub_devices);

static struct hid_driver sensor_hub_driver = {
	.name = "hid-sensor-hub",
	.id_table = sensor_hub_devices,
	.probe = sensor_hub_probe,
	.remove = sensor_hub_remove,
	.raw_event = sensor_hub_raw_event,
#ifdef CONFIG_PM
	.suspend = sensor_hub_suspend,
	.resume =  sensor_hub_resume,
	.reset_resume =  sensor_hub_reset_resume,
#endif
};
module_hid_driver(sensor_hub_driver);

MODULE_DESCRIPTION("HID Sensor Hub driver");
MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
401ca24f	1	/*
	2	* HID Sensors Driver
	3	* Copyright (c) 2012, Intel Corporation.
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms and conditions of the GNU General Public License,
	7	* version 2, as published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope it will be useful, but WITHOUT
	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	12	* more details.
	13	*
	14	* You should have received a copy of the GNU General Public License along with
	15	* this program; if not, write to the Free Software Foundation, Inc.,
	16	* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
	17	*
	18	*/
	19	#include <linux/device.h>
	20	#include <linux/hid.h>
401ca24f	21	#include <linux/module.h>
	22	#include <linux/slab.h>
	23	#include <linux/mfd/core.h>
	24	#include <linux/list.h>
	25	#include <linux/hid-sensor-ids.h>
	26	#include <linux/hid-sensor-hub.h>
	27	#include "hid-ids.h"
	28
	29	/**
	30	* struct sensor_hub_pending - Synchronous read pending information
	31	* @status: Pending status true/false.
	32	* @ready: Completion synchronization data.
	33	* @usage_id: Usage id for physical device, E.g. Gyro usage id.
	34	* @attr_usage_id: Usage Id of a field, E.g. X-AXIS for a gyro.
	35	* @raw_size: Response size for a read request.
	36	* @raw_data: Place holder for received response.
	37	*/
	38	struct sensor_hub_pending {
	39	bool status;
	40	struct completion ready;
	41	u32 usage_id;
	42	u32 attr_usage_id;
	43	int raw_size;
	44	u8 *raw_data;
	45	};
	46
	47	/**
	48	* struct sensor_hub_data - Hold a instance data for a HID hub device
	49	* @hsdev: Stored hid instance for current hub device.
	50	* @mutex: Mutex to serialize synchronous request.
	51	* @lock: Spin lock to protect pending request structure.
	52	* @pending: Holds information of pending sync read request.
	53	* @dyn_callback_list: Holds callback function
	54	* @dyn_callback_lock: spin lock to protect callback list
	55	* @hid_sensor_hub_client_devs: Stores all MFD cells for a hub instance.
	56	* @hid_sensor_client_cnt: Number of MFD cells, (no of sensors attached).
	57	*/
	58	struct sensor_hub_data {
	59	struct hid_sensor_hub_device *hsdev;
	60	struct mutex mutex;
	61	spinlock_t lock;
	62	struct sensor_hub_pending pending;
	63	struct list_head dyn_callback_list;
	64	spinlock_t dyn_callback_lock;
	65	struct mfd_cell *hid_sensor_hub_client_devs;
	66	int hid_sensor_client_cnt;
	67	};
	68
	69	/**
	70	* struct hid_sensor_hub_callbacks_list - Stores callback list
	71	* @list: list head.
	72	* @usage_id: usage id for a physical device.
	73	* @usage_callback: Stores registered callback functions.
	74	* @priv: Private data for a physical device.
	75	*/
	76	struct hid_sensor_hub_callbacks_list {
	77	struct list_head list;
	78	u32 usage_id;
	79	struct hid_sensor_hub_callbacks *usage_callback;
	80	void *priv;
	81	};
	82
401ca24f	83	static struct hid_report sensor_hub_report(int id, struct hid_device hdev,
	84	int dir)
	85	{
	86	struct hid_report *report;
	87
	88	list_for_each_entry(report, &hdev->report_enum[dir].report_list, list) {
	89	if (report->id == id)
	90	return report;
	91	}
	92	hid_warn(hdev, "No report with id 0x%x found\n", id);
	93
	94	return NULL;
	95	}
	96
	97	static int sensor_hub_get_physical_device_count(
	98	struct hid_report_enum *report_enum)
	99	{
	100	struct hid_report *report;
	101	struct hid_field *field;
	102	int cnt = 0;
	103
	104	list_for_each_entry(report, &report_enum->report_list, list) {
	105	field = report->field[0];
	106	if (report->maxfield && field &&
	107	field->physical)
	108	cnt++;
	109	}
	110
	111	return cnt;
	112	}
	113
	114	static void sensor_hub_fill_attr_info(
	115	struct hid_sensor_hub_attribute_info *info,
	116	s32 index, s32 report_id, s32 units, s32 unit_expo, s32 size)
	117	{
	118	info->index = index;
	119	info->report_id = report_id;
	120	info->units = units;
	121	info->unit_expo = unit_expo;
	122	info->size = size/8;
	123	}
	124
	125	static struct hid_sensor_hub_callbacks *sensor_hub_get_callback(
	126	struct hid_device *hdev,
	127	u32 usage_id, void **priv)
	128	{
	129	struct hid_sensor_hub_callbacks_list *callback;
	130	struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
	131
	132	spin_lock(&pdata->dyn_callback_lock);
	133	list_for_each_entry(callback, &pdata->dyn_callback_list, list)
	134	if (callback->usage_id == usage_id) {
	135	*priv = callback->priv;
	136	spin_unlock(&pdata->dyn_callback_lock);
	137	return callback->usage_callback;
	138	}
	139	spin_unlock(&pdata->dyn_callback_lock);
	140
	141	return NULL;
	142	}
	143
	144	int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
	145	u32 usage_id,
	146	struct hid_sensor_hub_callbacks *usage_callback)
147	{
148	struct hid_sensor_hub_callbacks_list *callback;
149	struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
150
151	spin_lock(&pdata->dyn_callback_lock);
152	list_for_each_entry(callback, &pdata->dyn_callback_list, list)
153	if (callback->usage_id == usage_id) {
154	spin_unlock(&pdata->dyn_callback_lock);
155	return -EINVAL;
156	}
2b7c4b8e	157	callback = kzalloc(sizeof(*callback), GFP_ATOMIC);
401ca24f	158	if (!callback) {
	159	spin_unlock(&pdata->dyn_callback_lock);
	160	return -ENOMEM;
	161	}
	162	callback->usage_callback = usage_callback;
	163	callback->usage_id = usage_id;
	164	callback->priv = NULL;
	165	list_add_tail(&callback->list, &pdata->dyn_callback_list);
	166	spin_unlock(&pdata->dyn_callback_lock);
	167
	168	return 0;
	169	}
	170	EXPORT_SYMBOL_GPL(sensor_hub_register_callback);
	171
	172	int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev,
	173	u32 usage_id)
	174	{
	175	struct hid_sensor_hub_callbacks_list *callback;
	176	struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
	177
	178	spin_lock(&pdata->dyn_callback_lock);
	179	list_for_each_entry(callback, &pdata->dyn_callback_list, list)
	180	if (callback->usage_id == usage_id) {
	181	list_del(&callback->list);
	182	kfree(callback);
	183	break;
	184	}
	185	spin_unlock(&pdata->dyn_callback_lock);
	186
	187	return 0;
	188	}
	189	EXPORT_SYMBOL_GPL(sensor_hub_remove_callback);
	190
	191	int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
	192	u32 field_index, s32 value)
	193	{
	194	struct hid_report *report;
	195	struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
	196	int ret = 0;
	197
401ca24f	198	mutex_lock(&data->mutex);
	199	report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
	200	if (!report \|\| (field_index >= report->maxfield)) {
	201	ret = -EINVAL;
	202	goto done_proc;
	203	}
	204	hid_set_field(report->field[field_index], 0, value);
d8814272	205	hid_hw_request(hsdev->hdev, report, HID_REQ_SET_REPORT);
b7966a4d	206	hid_hw_wait(hsdev->hdev);
401ca24f	207
	208	done_proc:
	209	mutex_unlock(&data->mutex);
	210
	211	return ret;
	212	}
	213	EXPORT_SYMBOL_GPL(sensor_hub_set_feature);
	214
	215	int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
	216	u32 field_index, s32 *value)
	217	{
	218	struct hid_report *report;
	219	struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
	220	int ret = 0;
	221
401ca24f	222	mutex_lock(&data->mutex);
401ca24f	223	report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
a3957df7 KC	224	if (!report \|\| (field_index >= report->maxfield) \|\|
a3957df7 KC	225	report->field[field_index]->report_count < 1) {
401ca24f	226	ret = -EINVAL;
	227	goto done_proc;
	228	}
d8814272	229	hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
b7966a4d	230	hid_hw_wait(hsdev->hdev);
401ca24f	231	*value = report->field[field_index]->value[0];
	232
	233	done_proc:
	234	mutex_unlock(&data->mutex);
	235
	236	return ret;
	237	}
	238	EXPORT_SYMBOL_GPL(sensor_hub_get_feature);
	239
	240
	241	int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
	242	u32 usage_id,
	243	u32 attr_usage_id, u32 report_id)
	244	{
	245	struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
	246	unsigned long flags;
	247	struct hid_report *report;
	248	int ret_val = 0;
	249
401ca24f	250	mutex_lock(&data->mutex);
	251	memset(&data->pending, 0, sizeof(data->pending));
	252	init_completion(&data->pending.ready);
	253	data->pending.usage_id = usage_id;
	254	data->pending.attr_usage_id = attr_usage_id;
	255	data->pending.raw_size = 0;
	256
	257	spin_lock_irqsave(&data->lock, flags);
	258	data->pending.status = true;
	259	report = sensor_hub_report(report_id, hsdev->hdev, HID_INPUT_REPORT);
	260	if (!report) {
	261	spin_unlock_irqrestore(&data->lock, flags);
	262	goto err_free;
	263	}
d8814272	264	hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
401ca24f	265	spin_unlock_irqrestore(&data->lock, flags);
	266	wait_for_completion_interruptible_timeout(&data->pending.ready, HZ*5);
	267	switch (data->pending.raw_size) {
	268	case 1:
	269	ret_val = (u8 )data->pending.raw_data;
	270	break;
	271	case 2:
	272	ret_val = (u16 )data->pending.raw_data;
	273	break;
	274	case 4:
	275	ret_val = (u32 )data->pending.raw_data;
	276	break;
	277	default:
	278	ret_val = 0;
	279	}
	280	kfree(data->pending.raw_data);
	281
	282	err_free:
	283	data->pending.status = false;
	284	mutex_unlock(&data->mutex);
	285
	286	return ret_val;
	287	}
	288	EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);
	289
	290	int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
	291	u8 type,
	292	u32 usage_id,
	293	u32 attr_usage_id,
	294	struct hid_sensor_hub_attribute_info *info)
	295	{
	296	int ret = -1;
	297	int i, j;
	298	int collection_index = -1;
	299	struct hid_report *report;
	300	struct hid_field *field;
	301	struct hid_report_enum *report_enum;
	302	struct hid_device *hdev = hsdev->hdev;
	303
	304	/* Initialize with defaults */
	305	info->usage_id = usage_id;
	306	info->attrib_id = attr_usage_id;
	307	info->report_id = -1;
	308	info->index = -1;
	309	info->units = -1;
	310	info->unit_expo = -1;
	311
	312	for (i = 0; i < hdev->maxcollection; ++i) {
	313	struct hid_collection *collection = &hdev->collection[i];
	314	if (usage_id == collection->usage) {
	315	collection_index = i;
	316	break;
	317	}
	318	}
	319	if (collection_index == -1)
	320	goto err_ret;
	321
	322	report_enum = &hdev->report_enum[type];
	323	list_for_each_entry(report, &report_enum->report_list, list) {
	324	for (i = 0; i < report->maxfield; ++i) {
	325	field = report->field[i];
	326	if (field->physical == usage_id &&
	327	field->logical == attr_usage_id) {
	328	sensor_hub_fill_attr_info(info, i, report->id,
329	field->unit, field->unit_exponent,
505014c1 SP	330	field->report_size *
505014c1 SP	331	field->report_count);
401ca24f	332	ret = 0;
	333	} else {
	334	for (j = 0; j < field->maxusage; ++j) {
	335	if (field->usage[j].hid ==
	336	attr_usage_id &&
	337	field->usage[j].collection_index ==
	338	collection_index) {
	339	sensor_hub_fill_attr_info(info,
	340	i, report->id,
	341	field->unit,
	342	field->unit_exponent,
505014c1 SP	343	field->report_size *
505014c1 SP	344	field->report_count);
401ca24f	345	ret = 0;
	346	break;
	347	}
	348	}
	349	}
	350	if (ret == 0)
	351	break;
	352	}
	353	}
	354
	355	err_ret:
	356	return ret;
	357	}
	358	EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info);
	359
	360	#ifdef CONFIG_PM
	361	static int sensor_hub_suspend(struct hid_device *hdev, pm_message_t message)
	362	{
	363	struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
	364	struct hid_sensor_hub_callbacks_list *callback;
	365
	366	hid_dbg(hdev, " sensor_hub_suspend\n");
	367	spin_lock(&pdata->dyn_callback_lock);
	368	list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
	369	if (callback->usage_callback->suspend)
	370	callback->usage_callback->suspend(
	371	pdata->hsdev, callback->priv);
	372	}
	373	spin_unlock(&pdata->dyn_callback_lock);
	374
	375	return 0;
	376	}
	377
	378	static int sensor_hub_resume(struct hid_device *hdev)
	379	{
	380	struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
	381	struct hid_sensor_hub_callbacks_list *callback;
	382
	383	hid_dbg(hdev, " sensor_hub_resume\n");
	384	spin_lock(&pdata->dyn_callback_lock);
	385	list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
	386	if (callback->usage_callback->resume)
	387	callback->usage_callback->resume(
	388	pdata->hsdev, callback->priv);
	389	}
	390	spin_unlock(&pdata->dyn_callback_lock);
	391
	392	return 0;
	393	}
	394
	395	static int sensor_hub_reset_resume(struct hid_device *hdev)
	396	{
	397	return 0;
	398	}
	399	#endif
	400	/*
	401	* Handle raw report as sent by device
	402	*/
	403	static int sensor_hub_raw_event(struct hid_device *hdev,
	404	struct hid_report report, u8 raw_data, int size)
	405	{
	406	int i;
	407	u8 *ptr;
	408	int sz;
409	struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
410	unsigned long flags;
411	struct hid_sensor_hub_callbacks *callback = NULL;
412	struct hid_collection *collection = NULL;
413	void *priv = NULL;
414
415	hid_dbg(hdev, "sensor_hub_raw_event report id:0x%x size:%d type:%d\n",
416	report->id, size, report->type);
417	hid_dbg(hdev, "maxfield:%d\n", report->maxfield);
418	if (report->type != HID_INPUT_REPORT)
419	return 1;
420
421	ptr = raw_data;
422	ptr++; /Skip report id/
423
401ca24f	424	spin_lock_irqsave(&pdata->lock, flags);
	425
	426	for (i = 0; i < report->maxfield; ++i) {
	427
	428	hid_dbg(hdev, "%d collection_index:%x hid:%x sz:%x\n",
	429	i, report->field[i]->usage->collection_index,
	430	report->field[i]->usage->hid,
505014c1 SP	431	(report->field[i]->report_size *
	432	report->field[i]->report_count)/8);
	433	sz = (report->field[i]->report_size *
	434	report->field[i]->report_count)/8;
401ca24f	435	if (pdata->pending.status && pdata->pending.attr_usage_id ==
	436	report->field[i]->usage->hid) {
	437	hid_dbg(hdev, "data was pending ...\n");
2b7c4b8e	438	pdata->pending.raw_data = kmalloc(sz, GFP_ATOMIC);
401ca24f	439	if (pdata->pending.raw_data) {
	440	memcpy(pdata->pending.raw_data, ptr, sz);
	441	pdata->pending.raw_size = sz;
	442	} else
	443	pdata->pending.raw_size = 0;
	444	complete(&pdata->pending.ready);
	445	}
	446	collection = &hdev->collection[
	447	report->field[i]->usage->collection_index];
	448	hid_dbg(hdev, "collection->usage %x\n",
	449	collection->usage);
	450	callback = sensor_hub_get_callback(pdata->hsdev->hdev,
	451	report->field[i]->physical,
	452	&priv);
	453	if (callback && callback->capture_sample) {
	454	if (report->field[i]->logical)
	455	callback->capture_sample(pdata->hsdev,
	456	report->field[i]->logical, sz, ptr,
	457	callback->pdev);
	458	else
	459	callback->capture_sample(pdata->hsdev,
	460	report->field[i]->usage->hid, sz, ptr,
	461	callback->pdev);
	462	}
	463	ptr += sz;
	464	}
	465	if (callback && collection && callback->send_event)
	466	callback->send_event(pdata->hsdev, collection->usage,
	467	callback->pdev);
	468	spin_unlock_irqrestore(&pdata->lock, flags);
	469
401ca24f	470	return 1;
	471	}
	472
	473	static int sensor_hub_probe(struct hid_device *hdev,
	474	const struct hid_device_id *id)
	475	{
	476	int ret;
	477	struct sensor_hub_data *sd;
	478	int i;
	479	char *name;
	480	struct hid_report *report;
	481	struct hid_report_enum *report_enum;
	482	struct hid_field *field;
	483	int dev_cnt;
	484
	485	sd = kzalloc(sizeof(struct sensor_hub_data), GFP_KERNEL);
	486	if (!sd) {
	487	hid_err(hdev, "cannot allocate Sensor data\n");
	488	return -ENOMEM;
	489	}
	490	sd->hsdev = kzalloc(sizeof(struct hid_sensor_hub_device), GFP_KERNEL);
	491	if (!sd->hsdev) {
	492	hid_err(hdev, "cannot allocate hid_sensor_hub_device\n");
	493	ret = -ENOMEM;
	494	goto err_free_hub;
	495	}
	496	hid_set_drvdata(hdev, sd);
	497	sd->hsdev->hdev = hdev;
	498	sd->hsdev->vendor_id = hdev->vendor;
	499	sd->hsdev->product_id = hdev->product;
	500	spin_lock_init(&sd->lock);
	501	spin_lock_init(&sd->dyn_callback_lock);
	502	mutex_init(&sd->mutex);
	503	ret = hid_parse(hdev);
	504	if (ret) {
	505	hid_err(hdev, "parse failed\n");
	506	goto err_free;
	507	}
401ca24f	508	INIT_LIST_HEAD(&hdev->inputs);
401ca24f	509
401ca24f	510	ret = hid_hw_start(hdev, 0);
	511	if (ret) {
	512	hid_err(hdev, "hw start failed\n");
	513	goto err_free;
	514	}
	515	ret = hid_hw_open(hdev);
	516	if (ret) {
	517	hid_err(hdev, "failed to open input interrupt pipe\n");
	518	goto err_stop_hw;
	519	}
	520
	521	INIT_LIST_HEAD(&sd->dyn_callback_list);
	522	sd->hid_sensor_client_cnt = 0;
	523	report_enum = &hdev->report_enum[HID_INPUT_REPORT];
	524
	525	dev_cnt = sensor_hub_get_physical_device_count(report_enum);
	526	if (dev_cnt > HID_MAX_PHY_DEVICES) {
	527	hid_err(hdev, "Invalid Physical device count\n");
	528	ret = -EINVAL;
	529	goto err_close;
	530	}
	531	sd->hid_sensor_hub_client_devs = kzalloc(dev_cnt *
	532	sizeof(struct mfd_cell),
	533	GFP_KERNEL);
	534	if (sd->hid_sensor_hub_client_devs == NULL) {
f2f13a68	535	hid_err(hdev, "Failed to allocate memory for mfd cells\n");
401ca24f	536	ret = -ENOMEM;
	537	goto err_close;
	538	}
	539	list_for_each_entry(report, &report_enum->report_list, list) {
	540	hid_dbg(hdev, "Report id:%x\n", report->id);
	541	field = report->field[0];
	542	if (report->maxfield && field &&
	543	field->physical) {
	544	name = kasprintf(GFP_KERNEL, "HID-SENSOR-%x",
	545	field->physical);
	546	if (name == NULL) {
f2f13a68	547	hid_err(hdev, "Failed MFD device name\n");
401ca24f	548	ret = -ENOMEM;
f2f13a68	549	goto err_free_names;
401ca24f	550	}
	551	sd->hid_sensor_hub_client_devs[
	552	sd->hid_sensor_client_cnt].name = name;
	553	sd->hid_sensor_hub_client_devs[
	554	sd->hid_sensor_client_cnt].platform_data =
	555	sd->hsdev;
	556	sd->hid_sensor_hub_client_devs[
	557	sd->hid_sensor_client_cnt].pdata_size =
	558	sizeof(*sd->hsdev);
	559	hid_dbg(hdev, "Adding %s:%p\n", name, sd);
	560	sd->hid_sensor_client_cnt++;
	561	}
	562	}
	563	ret = mfd_add_devices(&hdev->dev, 0, sd->hid_sensor_hub_client_devs,
f45c69b1	564	sd->hid_sensor_client_cnt, NULL, 0, NULL);
401ca24f	565	if (ret < 0)
	566	goto err_free_names;
	567
	568	return ret;
	569
	570	err_free_names:
	571	for (i = 0; i < sd->hid_sensor_client_cnt ; ++i)
	572	kfree(sd->hid_sensor_hub_client_devs[i].name);
401ca24f	573	kfree(sd->hid_sensor_hub_client_devs);
401ca24f	574	err_close:
401ca24f	575	hid_hw_close(hdev);
	576	err_stop_hw:
	577	hid_hw_stop(hdev);
	578	err_free:
	579	kfree(sd->hsdev);
	580	err_free_hub:
	581	kfree(sd);
	582
	583	return ret;
	584	}
	585
	586	static void sensor_hub_remove(struct hid_device *hdev)
	587	{
	588	struct sensor_hub_data *data = hid_get_drvdata(hdev);
	589	unsigned long flags;
	590	int i;
	591
	592	hid_dbg(hdev, " hardware removed\n");
401ca24f	593	hid_hw_close(hdev);
f2f13a68	594	hid_hw_stop(hdev);
401ca24f	595	spin_lock_irqsave(&data->lock, flags);
	596	if (data->pending.status)
	597	complete(&data->pending.ready);
	598	spin_unlock_irqrestore(&data->lock, flags);
	599	mfd_remove_devices(&hdev->dev);
	600	for (i = 0; i < data->hid_sensor_client_cnt ; ++i)
	601	kfree(data->hid_sensor_hub_client_devs[i].name);
	602	kfree(data->hid_sensor_hub_client_devs);
	603	hid_set_drvdata(hdev, NULL);
	604	mutex_destroy(&data->mutex);
	605	kfree(data->hsdev);
	606	kfree(data);
	607	}
	608
	609	static const struct hid_device_id sensor_hub_devices[] = {
0d1e4b02 MW	610	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, HID_ANY_ID,
0d1e4b02 MW	611	HID_ANY_ID) },
401ca24f	612	{ }
	613	};
	614	MODULE_DEVICE_TABLE(hid, sensor_hub_devices);
	615
401ca24f	616	static struct hid_driver sensor_hub_driver = {
	617	.name = "hid-sensor-hub",
	618	.id_table = sensor_hub_devices,
	619	.probe = sensor_hub_probe,
	620	.remove = sensor_hub_remove,
	621	.raw_event = sensor_hub_raw_event,
	622	#ifdef CONFIG_PM
	623	.suspend = sensor_hub_suspend,
	624	.resume = sensor_hub_resume,
	625	.reset_resume = sensor_hub_reset_resume,
	626	#endif
	627	};
f425458e	628	module_hid_driver(sensor_hub_driver);
401ca24f	629
	630	MODULE_DESCRIPTION("HID Sensor Hub driver");
	631	MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
	632	MODULE_LICENSE("GPL");