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620 lines
17 KiB
C
620 lines
17 KiB
C
/*
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* HID Sensors Driver
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* Copyright (c) 2012, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <linux/device.h>
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#include <linux/hid.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/mfd/core.h>
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#include <linux/list.h>
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#include <linux/hid-sensor-ids.h>
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#include <linux/hid-sensor-hub.h>
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#include "hid-ids.h"
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/**
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* struct sensor_hub_pending - Synchronous read pending information
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* @status: Pending status true/false.
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* @ready: Completion synchronization data.
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* @usage_id: Usage id for physical device, E.g. Gyro usage id.
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* @attr_usage_id: Usage Id of a field, E.g. X-AXIS for a gyro.
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* @raw_size: Response size for a read request.
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* @raw_data: Place holder for received response.
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*/
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struct sensor_hub_pending {
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bool status;
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struct completion ready;
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u32 usage_id;
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u32 attr_usage_id;
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int raw_size;
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u8 *raw_data;
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};
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/**
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* struct sensor_hub_data - Hold a instance data for a HID hub device
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* @hsdev: Stored hid instance for current hub device.
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* @mutex: Mutex to serialize synchronous request.
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* @lock: Spin lock to protect pending request structure.
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* @pending: Holds information of pending sync read request.
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* @dyn_callback_list: Holds callback function
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* @dyn_callback_lock: spin lock to protect callback list
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* @hid_sensor_hub_client_devs: Stores all MFD cells for a hub instance.
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* @hid_sensor_client_cnt: Number of MFD cells, (no of sensors attached).
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*/
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struct sensor_hub_data {
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struct hid_sensor_hub_device *hsdev;
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struct mutex mutex;
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spinlock_t lock;
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struct sensor_hub_pending pending;
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struct list_head dyn_callback_list;
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spinlock_t dyn_callback_lock;
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struct mfd_cell *hid_sensor_hub_client_devs;
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int hid_sensor_client_cnt;
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};
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/**
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* struct hid_sensor_hub_callbacks_list - Stores callback list
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* @list: list head.
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* @usage_id: usage id for a physical device.
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* @usage_callback: Stores registered callback functions.
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* @priv: Private data for a physical device.
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*/
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struct hid_sensor_hub_callbacks_list {
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struct list_head list;
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u32 usage_id;
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struct hid_sensor_hub_callbacks *usage_callback;
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void *priv;
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};
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static struct hid_report *sensor_hub_report(int id, struct hid_device *hdev,
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int dir)
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{
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struct hid_report *report;
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list_for_each_entry(report, &hdev->report_enum[dir].report_list, list) {
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if (report->id == id)
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return report;
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}
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hid_warn(hdev, "No report with id 0x%x found\n", id);
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return NULL;
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}
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static int sensor_hub_get_physical_device_count(
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struct hid_report_enum *report_enum)
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{
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struct hid_report *report;
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struct hid_field *field;
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int cnt = 0;
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list_for_each_entry(report, &report_enum->report_list, list) {
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field = report->field[0];
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if (report->maxfield && field && field->physical)
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cnt++;
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}
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return cnt;
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}
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static void sensor_hub_fill_attr_info(
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struct hid_sensor_hub_attribute_info *info,
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s32 index, s32 report_id, s32 units, s32 unit_expo, s32 size)
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{
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info->index = index;
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info->report_id = report_id;
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info->units = units;
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info->unit_expo = unit_expo;
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info->size = size/8;
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}
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static struct hid_sensor_hub_callbacks *sensor_hub_get_callback(
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struct hid_device *hdev,
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u32 usage_id, void **priv)
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{
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struct hid_sensor_hub_callbacks_list *callback;
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struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
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spin_lock(&pdata->dyn_callback_lock);
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list_for_each_entry(callback, &pdata->dyn_callback_list, list)
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if (callback->usage_id == usage_id) {
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*priv = callback->priv;
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spin_unlock(&pdata->dyn_callback_lock);
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return callback->usage_callback;
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}
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spin_unlock(&pdata->dyn_callback_lock);
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return NULL;
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}
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int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
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u32 usage_id,
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struct hid_sensor_hub_callbacks *usage_callback)
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{
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struct hid_sensor_hub_callbacks_list *callback;
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struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
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spin_lock(&pdata->dyn_callback_lock);
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list_for_each_entry(callback, &pdata->dyn_callback_list, list)
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if (callback->usage_id == usage_id) {
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spin_unlock(&pdata->dyn_callback_lock);
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return -EINVAL;
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}
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callback = kzalloc(sizeof(*callback), GFP_ATOMIC);
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if (!callback) {
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spin_unlock(&pdata->dyn_callback_lock);
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return -ENOMEM;
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}
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callback->usage_callback = usage_callback;
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callback->usage_id = usage_id;
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callback->priv = NULL;
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list_add_tail(&callback->list, &pdata->dyn_callback_list);
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spin_unlock(&pdata->dyn_callback_lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(sensor_hub_register_callback);
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int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev,
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u32 usage_id)
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{
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struct hid_sensor_hub_callbacks_list *callback;
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struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
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spin_lock(&pdata->dyn_callback_lock);
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list_for_each_entry(callback, &pdata->dyn_callback_list, list)
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if (callback->usage_id == usage_id) {
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list_del(&callback->list);
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kfree(callback);
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break;
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}
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spin_unlock(&pdata->dyn_callback_lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(sensor_hub_remove_callback);
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int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
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u32 field_index, s32 value)
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{
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struct hid_report *report;
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struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
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int ret = 0;
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mutex_lock(&data->mutex);
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report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
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if (!report || (field_index >= report->maxfield)) {
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ret = -EINVAL;
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goto done_proc;
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}
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hid_set_field(report->field[field_index], 0, value);
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hid_hw_request(hsdev->hdev, report, HID_REQ_SET_REPORT);
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hid_hw_wait(hsdev->hdev);
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done_proc:
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mutex_unlock(&data->mutex);
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return ret;
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}
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EXPORT_SYMBOL_GPL(sensor_hub_set_feature);
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int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
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u32 field_index, s32 *value)
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{
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struct hid_report *report;
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struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
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int ret = 0;
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mutex_lock(&data->mutex);
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report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
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if (!report || (field_index >= report->maxfield) ||
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report->field[field_index]->report_count < 1) {
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ret = -EINVAL;
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goto done_proc;
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}
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hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
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hid_hw_wait(hsdev->hdev);
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*value = report->field[field_index]->value[0];
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done_proc:
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mutex_unlock(&data->mutex);
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return ret;
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}
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EXPORT_SYMBOL_GPL(sensor_hub_get_feature);
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int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
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u32 usage_id,
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u32 attr_usage_id, u32 report_id)
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{
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struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
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unsigned long flags;
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struct hid_report *report;
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int ret_val = 0;
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mutex_lock(&data->mutex);
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memset(&data->pending, 0, sizeof(data->pending));
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init_completion(&data->pending.ready);
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data->pending.usage_id = usage_id;
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data->pending.attr_usage_id = attr_usage_id;
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data->pending.raw_size = 0;
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spin_lock_irqsave(&data->lock, flags);
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data->pending.status = true;
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report = sensor_hub_report(report_id, hsdev->hdev, HID_INPUT_REPORT);
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if (!report) {
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spin_unlock_irqrestore(&data->lock, flags);
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goto err_free;
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}
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hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
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spin_unlock_irqrestore(&data->lock, flags);
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wait_for_completion_interruptible_timeout(&data->pending.ready, HZ*5);
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switch (data->pending.raw_size) {
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case 1:
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ret_val = *(u8 *)data->pending.raw_data;
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break;
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case 2:
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ret_val = *(u16 *)data->pending.raw_data;
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break;
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case 4:
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ret_val = *(u32 *)data->pending.raw_data;
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break;
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default:
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ret_val = 0;
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}
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kfree(data->pending.raw_data);
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err_free:
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data->pending.status = false;
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mutex_unlock(&data->mutex);
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return ret_val;
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}
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EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);
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int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
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u8 type,
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u32 usage_id,
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u32 attr_usage_id,
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struct hid_sensor_hub_attribute_info *info)
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{
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int ret = -1;
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int i, j;
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int collection_index = -1;
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struct hid_report *report;
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struct hid_field *field;
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struct hid_report_enum *report_enum;
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struct hid_device *hdev = hsdev->hdev;
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/* Initialize with defaults */
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info->usage_id = usage_id;
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info->attrib_id = attr_usage_id;
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info->report_id = -1;
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info->index = -1;
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info->units = -1;
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info->unit_expo = -1;
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for (i = 0; i < hdev->maxcollection; ++i) {
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struct hid_collection *collection = &hdev->collection[i];
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if (usage_id == collection->usage) {
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collection_index = i;
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break;
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}
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}
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if (collection_index == -1)
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goto err_ret;
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report_enum = &hdev->report_enum[type];
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list_for_each_entry(report, &report_enum->report_list, list) {
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for (i = 0; i < report->maxfield; ++i) {
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field = report->field[i];
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if (field->physical == usage_id &&
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field->logical == attr_usage_id) {
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sensor_hub_fill_attr_info(info, i, report->id,
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field->unit, field->unit_exponent,
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field->report_size);
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ret = 0;
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} else {
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for (j = 0; j < field->maxusage; ++j) {
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if (field->usage[j].hid ==
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attr_usage_id &&
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field->usage[j].collection_index ==
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collection_index) {
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sensor_hub_fill_attr_info(info,
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i, report->id,
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field->unit,
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field->unit_exponent,
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field->report_size);
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ret = 0;
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break;
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}
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}
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}
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if (ret == 0)
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break;
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}
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}
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err_ret:
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return ret;
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}
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EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info);
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#ifdef CONFIG_PM
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static int sensor_hub_suspend(struct hid_device *hdev, pm_message_t message)
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{
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struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
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struct hid_sensor_hub_callbacks_list *callback;
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hid_dbg(hdev, " sensor_hub_suspend\n");
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spin_lock(&pdata->dyn_callback_lock);
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list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
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if (callback->usage_callback->suspend)
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callback->usage_callback->suspend(
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pdata->hsdev, callback->priv);
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}
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spin_unlock(&pdata->dyn_callback_lock);
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return 0;
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}
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static int sensor_hub_resume(struct hid_device *hdev)
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{
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struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
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struct hid_sensor_hub_callbacks_list *callback;
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hid_dbg(hdev, " sensor_hub_resume\n");
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spin_lock(&pdata->dyn_callback_lock);
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list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
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if (callback->usage_callback->resume)
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callback->usage_callback->resume(
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pdata->hsdev, callback->priv);
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}
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spin_unlock(&pdata->dyn_callback_lock);
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return 0;
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}
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static int sensor_hub_reset_resume(struct hid_device *hdev)
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{
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return 0;
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}
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#endif
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/*
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* Handle raw report as sent by device
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*/
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static int sensor_hub_raw_event(struct hid_device *hdev,
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struct hid_report *report, u8 *raw_data, int size)
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{
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int i;
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u8 *ptr;
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int sz;
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struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
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unsigned long flags;
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struct hid_sensor_hub_callbacks *callback = NULL;
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struct hid_collection *collection = NULL;
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void *priv = NULL;
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hid_dbg(hdev, "sensor_hub_raw_event report id:0x%x size:%d type:%d\n",
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report->id, size, report->type);
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hid_dbg(hdev, "maxfield:%d\n", report->maxfield);
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if (report->type != HID_INPUT_REPORT)
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return 1;
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ptr = raw_data;
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ptr++; /* Skip report id */
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spin_lock_irqsave(&pdata->lock, flags);
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for (i = 0; i < report->maxfield; ++i) {
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hid_dbg(hdev, "%d collection_index:%x hid:%x sz:%x\n",
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i, report->field[i]->usage->collection_index,
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report->field[i]->usage->hid,
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report->field[i]->report_size/8);
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sz = report->field[i]->report_size/8;
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if (pdata->pending.status && pdata->pending.attr_usage_id ==
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report->field[i]->usage->hid) {
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hid_dbg(hdev, "data was pending ...\n");
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pdata->pending.raw_data = kmemdup(ptr, sz, GFP_ATOMIC);
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if (pdata->pending.raw_data)
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pdata->pending.raw_size = sz;
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else
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pdata->pending.raw_size = 0;
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complete(&pdata->pending.ready);
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}
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collection = &hdev->collection[
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report->field[i]->usage->collection_index];
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hid_dbg(hdev, "collection->usage %x\n",
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collection->usage);
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callback = sensor_hub_get_callback(pdata->hsdev->hdev,
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report->field[i]->physical,
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&priv);
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if (callback && callback->capture_sample) {
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if (report->field[i]->logical)
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callback->capture_sample(pdata->hsdev,
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report->field[i]->logical, sz, ptr,
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callback->pdev);
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else
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callback->capture_sample(pdata->hsdev,
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report->field[i]->usage->hid, sz, ptr,
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callback->pdev);
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}
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ptr += sz;
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}
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if (callback && collection && callback->send_event)
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callback->send_event(pdata->hsdev, collection->usage,
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callback->pdev);
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spin_unlock_irqrestore(&pdata->lock, flags);
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return 1;
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}
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static int sensor_hub_probe(struct hid_device *hdev,
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const struct hid_device_id *id)
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{
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int ret;
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struct sensor_hub_data *sd;
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int i;
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char *name;
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struct hid_report *report;
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struct hid_report_enum *report_enum;
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struct hid_field *field;
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int dev_cnt;
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sd = devm_kzalloc(&hdev->dev, sizeof(*sd), GFP_KERNEL);
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if (!sd) {
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hid_err(hdev, "cannot allocate Sensor data\n");
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return -ENOMEM;
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}
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sd->hsdev = devm_kzalloc(&hdev->dev, sizeof(*sd->hsdev), GFP_KERNEL);
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if (!sd->hsdev) {
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hid_err(hdev, "cannot allocate hid_sensor_hub_device\n");
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return -ENOMEM;
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}
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hid_set_drvdata(hdev, sd);
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sd->hsdev->hdev = hdev;
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sd->hsdev->vendor_id = hdev->vendor;
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sd->hsdev->product_id = hdev->product;
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spin_lock_init(&sd->lock);
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spin_lock_init(&sd->dyn_callback_lock);
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mutex_init(&sd->mutex);
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ret = hid_parse(hdev);
|
|
if (ret) {
|
|
hid_err(hdev, "parse failed\n");
|
|
return ret;
|
|
}
|
|
INIT_LIST_HEAD(&hdev->inputs);
|
|
|
|
ret = hid_hw_start(hdev, 0);
|
|
if (ret) {
|
|
hid_err(hdev, "hw start failed\n");
|
|
return ret;
|
|
}
|
|
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);
|
|
|
|
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);
|
|
}
|
|
|
|
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");
|