v4.19.13 snapshot.
diff --git a/drivers/hid/hid-sensor-hub.c b/drivers/hid/hid-sensor-hub.c
new file mode 100644
index 0000000..4256fdc
--- /dev/null
+++ b/drivers/hid/hid-sensor-hub.c
@@ -0,0 +1,786 @@
+/*
+ * 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"
+
+#define HID_SENSOR_HUB_ENUM_QUIRK 0x01
+
+/**
+ * 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.
+ * @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).
+ * @ref_cnt: Number of MFD clients have opened this device
+ */
+struct sensor_hub_data {
+ struct mutex mutex;
+ spinlock_t lock;
+ struct list_head dyn_callback_list;
+ spinlock_t dyn_callback_lock;
+ struct mfd_cell *hid_sensor_hub_client_devs;
+ int hid_sensor_client_cnt;
+ unsigned long quirks;
+ int ref_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_device *hsdev;
+ 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_device *hdev)
+{
+ int i;
+ int count = 0;
+
+ for (i = 0; i < hdev->maxcollection; ++i) {
+ struct hid_collection *collection = &hdev->collection[i];
+ if (collection->type == HID_COLLECTION_PHYSICAL ||
+ collection->type == HID_COLLECTION_APPLICATION)
+ ++count;
+ }
+
+ return count;
+}
+
+static void sensor_hub_fill_attr_info(
+ struct hid_sensor_hub_attribute_info *info,
+ s32 index, s32 report_id, struct hid_field *field)
+{
+ info->index = index;
+ info->report_id = report_id;
+ info->units = field->unit;
+ info->unit_expo = field->unit_exponent;
+ info->size = (field->report_size * field->report_count)/8;
+ info->logical_minimum = field->logical_minimum;
+ info->logical_maximum = field->logical_maximum;
+}
+
+static struct hid_sensor_hub_callbacks *sensor_hub_get_callback(
+ struct hid_device *hdev,
+ u32 usage_id,
+ int collection_index,
+ struct hid_sensor_hub_device **hsdev,
+ void **priv)
+{
+ struct hid_sensor_hub_callbacks_list *callback;
+ struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
+ unsigned long flags;
+
+ spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
+ list_for_each_entry(callback, &pdata->dyn_callback_list, list)
+ if ((callback->usage_id == usage_id ||
+ callback->usage_id == HID_USAGE_SENSOR_COLLECTION) &&
+ (collection_index >=
+ callback->hsdev->start_collection_index) &&
+ (collection_index <
+ callback->hsdev->end_collection_index)) {
+ *priv = callback->priv;
+ *hsdev = callback->hsdev;
+ spin_unlock_irqrestore(&pdata->dyn_callback_lock,
+ flags);
+ return callback->usage_callback;
+ }
+ spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
+
+ 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);
+ unsigned long flags;
+
+ spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
+ list_for_each_entry(callback, &pdata->dyn_callback_list, list)
+ if (callback->usage_id == usage_id &&
+ callback->hsdev == hsdev) {
+ spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
+ return -EINVAL;
+ }
+ callback = kzalloc(sizeof(*callback), GFP_ATOMIC);
+ if (!callback) {
+ spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
+ return -ENOMEM;
+ }
+ callback->hsdev = hsdev;
+ callback->usage_callback = usage_callback;
+ callback->usage_id = usage_id;
+ callback->priv = NULL;
+ /*
+ * If there is a handler registered for the collection type, then
+ * it will handle all reports for sensors in this collection. If
+ * there is also an individual sensor handler registration, then
+ * we want to make sure that the reports are directed to collection
+ * handler, as this may be a fusion sensor. So add collection handlers
+ * to the beginning of the list, so that they are matched first.
+ */
+ if (usage_id == HID_USAGE_SENSOR_COLLECTION)
+ list_add(&callback->list, &pdata->dyn_callback_list);
+ else
+ list_add_tail(&callback->list, &pdata->dyn_callback_list);
+ spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
+
+ 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);
+ unsigned long flags;
+
+ spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
+ list_for_each_entry(callback, &pdata->dyn_callback_list, list)
+ if (callback->usage_id == usage_id &&
+ callback->hsdev == hsdev) {
+ list_del(&callback->list);
+ kfree(callback);
+ break;
+ }
+ spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
+
+ 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, int buffer_size, void *buffer)
+{
+ struct hid_report *report;
+ struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
+ __s32 *buf32 = buffer;
+ int i = 0;
+ int remaining_bytes;
+ __s32 value;
+ 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;
+ }
+
+ remaining_bytes = buffer_size % sizeof(__s32);
+ buffer_size = buffer_size / sizeof(__s32);
+ if (buffer_size) {
+ for (i = 0; i < buffer_size; ++i) {
+ hid_set_field(report->field[field_index], i,
+ (__force __s32)cpu_to_le32(*buf32));
+ ++buf32;
+ }
+ }
+ if (remaining_bytes) {
+ value = 0;
+ memcpy(&value, (u8 *)buf32, remaining_bytes);
+ hid_set_field(report->field[field_index], i,
+ (__force __s32)cpu_to_le32(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, int buffer_size, void *buffer)
+{
+ struct hid_report *report;
+ struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
+ int report_size;
+ int ret = 0;
+ u8 *val_ptr;
+ int buffer_index = 0;
+ int i;
+
+ memset(buffer, 0, buffer_size);
+
+ 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);
+
+ /* calculate number of bytes required to read this field */
+ report_size = DIV_ROUND_UP(report->field[field_index]->report_size,
+ 8) *
+ report->field[field_index]->report_count;
+ if (!report_size) {
+ ret = -EINVAL;
+ goto done_proc;
+ }
+ ret = min(report_size, buffer_size);
+
+ val_ptr = (u8 *)report->field[field_index]->value;
+ for (i = 0; i < report->field[field_index]->report_count; ++i) {
+ if (buffer_index >= ret)
+ break;
+
+ memcpy(&((u8 *)buffer)[buffer_index], val_ptr,
+ report->field[field_index]->report_size / 8);
+ val_ptr += sizeof(__s32);
+ buffer_index += (report->field[field_index]->report_size / 8);
+ }
+
+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,
+ enum sensor_hub_read_flags flag,
+ bool is_signed)
+{
+ struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
+ unsigned long flags;
+ struct hid_report *report;
+ int ret_val = 0;
+
+ report = sensor_hub_report(report_id, hsdev->hdev,
+ HID_INPUT_REPORT);
+ if (!report)
+ return -EINVAL;
+
+ mutex_lock(hsdev->mutex_ptr);
+ if (flag == SENSOR_HUB_SYNC) {
+ memset(&hsdev->pending, 0, sizeof(hsdev->pending));
+ init_completion(&hsdev->pending.ready);
+ hsdev->pending.usage_id = usage_id;
+ hsdev->pending.attr_usage_id = attr_usage_id;
+ hsdev->pending.raw_size = 0;
+
+ spin_lock_irqsave(&data->lock, flags);
+ hsdev->pending.status = true;
+ spin_unlock_irqrestore(&data->lock, flags);
+ }
+ mutex_lock(&data->mutex);
+ hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
+ mutex_unlock(&data->mutex);
+ if (flag == SENSOR_HUB_SYNC) {
+ wait_for_completion_interruptible_timeout(
+ &hsdev->pending.ready, HZ*5);
+ switch (hsdev->pending.raw_size) {
+ case 1:
+ if (is_signed)
+ ret_val = *(s8 *)hsdev->pending.raw_data;
+ else
+ ret_val = *(u8 *)hsdev->pending.raw_data;
+ break;
+ case 2:
+ if (is_signed)
+ ret_val = *(s16 *)hsdev->pending.raw_data;
+ else
+ ret_val = *(u16 *)hsdev->pending.raw_data;
+ break;
+ case 4:
+ ret_val = *(u32 *)hsdev->pending.raw_data;
+ break;
+ default:
+ ret_val = 0;
+ }
+ kfree(hsdev->pending.raw_data);
+ hsdev->pending.status = false;
+ }
+ mutex_unlock(hsdev->mutex_ptr);
+
+ return ret_val;
+}
+EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);
+
+int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
+ u32 report_id, int field_index, u32 usage_id)
+{
+ struct hid_report *report;
+ struct hid_field *field;
+ int i;
+
+ report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
+ if (!report || (field_index >= report->maxfield))
+ goto done_proc;
+
+ field = report->field[field_index];
+ for (i = 0; i < field->maxusage; ++i) {
+ if (field->usage[i].hid == usage_id)
+ return field->usage[i].usage_index;
+ }
+
+done_proc:
+ return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(hid_sensor_get_usage_index);
+
+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;
+ 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;
+
+ 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->maxusage) {
+ if (field->physical == usage_id &&
+ (field->logical == attr_usage_id ||
+ field->usage[0].hid ==
+ attr_usage_id) &&
+ (field->usage[0].collection_index >=
+ hsdev->start_collection_index) &&
+ (field->usage[0].collection_index <
+ hsdev->end_collection_index)) {
+
+ sensor_hub_fill_attr_info(info, i,
+ report->id,
+ field);
+ ret = 0;
+ break;
+ }
+ }
+ }
+
+ }
+
+ 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;
+ unsigned long flags;
+
+ hid_dbg(hdev, " sensor_hub_suspend\n");
+ spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
+ list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
+ if (callback->usage_callback->suspend)
+ callback->usage_callback->suspend(
+ callback->hsdev, callback->priv);
+ }
+ spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
+
+ 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;
+ unsigned long flags;
+
+ hid_dbg(hdev, " sensor_hub_resume\n");
+ spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
+ list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
+ if (callback->usage_callback->resume)
+ callback->usage_callback->resume(
+ callback->hsdev, callback->priv);
+ }
+ spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
+
+ 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;
+ struct hid_sensor_hub_device *hsdev = 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;
+ collection = &hdev->collection[
+ report->field[i]->usage->collection_index];
+ hid_dbg(hdev, "collection->usage %x\n",
+ collection->usage);
+
+ callback = sensor_hub_get_callback(hdev,
+ report->field[i]->physical,
+ report->field[i]->usage[0].collection_index,
+ &hsdev, &priv);
+ if (!callback) {
+ ptr += sz;
+ continue;
+ }
+ if (hsdev->pending.status && (hsdev->pending.attr_usage_id ==
+ report->field[i]->usage->hid ||
+ hsdev->pending.attr_usage_id ==
+ report->field[i]->logical)) {
+ hid_dbg(hdev, "data was pending ...\n");
+ hsdev->pending.raw_data = kmemdup(ptr, sz, GFP_ATOMIC);
+ if (hsdev->pending.raw_data)
+ hsdev->pending.raw_size = sz;
+ else
+ hsdev->pending.raw_size = 0;
+ complete(&hsdev->pending.ready);
+ }
+ if (callback->capture_sample) {
+ if (report->field[i]->logical)
+ callback->capture_sample(hsdev,
+ report->field[i]->logical, sz, ptr,
+ callback->pdev);
+ else
+ callback->capture_sample(hsdev,
+ report->field[i]->usage->hid, sz, ptr,
+ callback->pdev);
+ }
+ ptr += sz;
+ }
+ if (callback && collection && callback->send_event)
+ callback->send_event(hsdev, collection->usage,
+ callback->pdev);
+ spin_unlock_irqrestore(&pdata->lock, flags);
+
+ return 1;
+}
+
+int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev)
+{
+ int ret = 0;
+ struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
+
+ mutex_lock(&data->mutex);
+ if (!data->ref_cnt) {
+ ret = hid_hw_open(hsdev->hdev);
+ if (ret) {
+ hid_err(hsdev->hdev, "failed to open hid device\n");
+ mutex_unlock(&data->mutex);
+ return ret;
+ }
+ }
+ data->ref_cnt++;
+ mutex_unlock(&data->mutex);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(sensor_hub_device_open);
+
+void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev)
+{
+ struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
+
+ mutex_lock(&data->mutex);
+ data->ref_cnt--;
+ if (!data->ref_cnt)
+ hid_hw_close(hsdev->hdev);
+ mutex_unlock(&data->mutex);
+}
+EXPORT_SYMBOL_GPL(sensor_hub_device_close);
+
+static __u8 *sensor_hub_report_fixup(struct hid_device *hdev, __u8 *rdesc,
+ unsigned int *rsize)
+{
+ /*
+ * Checks if the report descriptor of Thinkpad Helix 2 has a logical
+ * minimum for magnetic flux axis greater than the maximum.
+ */
+ if (hdev->product == USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA &&
+ *rsize == 2558 && rdesc[913] == 0x17 && rdesc[914] == 0x40 &&
+ rdesc[915] == 0x81 && rdesc[916] == 0x08 &&
+ rdesc[917] == 0x00 && rdesc[918] == 0x27 &&
+ rdesc[921] == 0x07 && rdesc[922] == 0x00) {
+ /* Sets negative logical minimum for mag x, y and z */
+ rdesc[914] = rdesc[935] = rdesc[956] = 0xc0;
+ rdesc[915] = rdesc[936] = rdesc[957] = 0x7e;
+ rdesc[916] = rdesc[937] = rdesc[958] = 0xf7;
+ rdesc[917] = rdesc[938] = rdesc[959] = 0xff;
+ }
+
+ return rdesc;
+}
+
+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;
+ int dev_cnt;
+ struct hid_sensor_hub_device *hsdev;
+ struct hid_sensor_hub_device *last_hsdev = NULL;
+ struct hid_sensor_hub_device *collection_hsdev = NULL;
+
+ sd = devm_kzalloc(&hdev->dev, sizeof(*sd), GFP_KERNEL);
+ if (!sd) {
+ hid_err(hdev, "cannot allocate Sensor data\n");
+ return -ENOMEM;
+ }
+
+ hid_set_drvdata(hdev, sd);
+ sd->quirks = id->driver_data;
+
+ 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");
+ return ret;
+ }
+ INIT_LIST_HEAD(&hdev->inputs);
+
+ ret = hid_hw_start(hdev, 0);
+ if (ret) {
+ hid_err(hdev, "hw start failed\n");
+ return ret;
+ }
+ INIT_LIST_HEAD(&sd->dyn_callback_list);
+ sd->hid_sensor_client_cnt = 0;
+
+ dev_cnt = sensor_hub_get_physical_device_count(hdev);
+ if (dev_cnt > HID_MAX_PHY_DEVICES) {
+ hid_err(hdev, "Invalid Physical device count\n");
+ ret = -EINVAL;
+ goto err_stop_hw;
+ }
+ sd->hid_sensor_hub_client_devs = devm_kcalloc(&hdev->dev,
+ 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_stop_hw;
+ }
+
+ for (i = 0; i < hdev->maxcollection; ++i) {
+ struct hid_collection *collection = &hdev->collection[i];
+
+ if (collection->type == HID_COLLECTION_PHYSICAL ||
+ collection->type == HID_COLLECTION_APPLICATION) {
+
+ hsdev = devm_kzalloc(&hdev->dev, sizeof(*hsdev),
+ GFP_KERNEL);
+ if (!hsdev) {
+ hid_err(hdev, "cannot allocate hid_sensor_hub_device\n");
+ ret = -ENOMEM;
+ goto err_stop_hw;
+ }
+ hsdev->hdev = hdev;
+ hsdev->vendor_id = hdev->vendor;
+ hsdev->product_id = hdev->product;
+ hsdev->usage = collection->usage;
+ hsdev->mutex_ptr = devm_kzalloc(&hdev->dev,
+ sizeof(struct mutex),
+ GFP_KERNEL);
+ if (!hsdev->mutex_ptr) {
+ ret = -ENOMEM;
+ goto err_stop_hw;
+ }
+ mutex_init(hsdev->mutex_ptr);
+ hsdev->start_collection_index = i;
+ if (last_hsdev)
+ last_hsdev->end_collection_index = i;
+ last_hsdev = hsdev;
+ name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
+ "HID-SENSOR-%x",
+ collection->usage);
+ if (name == NULL) {
+ hid_err(hdev, "Failed MFD device name\n");
+ ret = -ENOMEM;
+ goto err_stop_hw;
+ }
+ 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 =
+ hsdev;
+ sd->hid_sensor_hub_client_devs[
+ sd->hid_sensor_client_cnt].pdata_size =
+ sizeof(*hsdev);
+ hid_dbg(hdev, "Adding %s:%d\n", name,
+ hsdev->start_collection_index);
+ sd->hid_sensor_client_cnt++;
+ if (collection_hsdev)
+ collection_hsdev->end_collection_index = i;
+ if (collection->type == HID_COLLECTION_APPLICATION &&
+ collection->usage == HID_USAGE_SENSOR_COLLECTION)
+ collection_hsdev = hsdev;
+ }
+ }
+ if (last_hsdev)
+ last_hsdev->end_collection_index = i;
+ if (collection_hsdev)
+ collection_hsdev->end_collection_index = i;
+
+ ret = mfd_add_hotplug_devices(&hdev->dev,
+ sd->hid_sensor_hub_client_devs,
+ sd->hid_sensor_client_cnt);
+ if (ret < 0)
+ goto err_stop_hw;
+
+ return ret;
+
+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);
+ for (i = 0; i < data->hid_sensor_client_cnt; ++i) {
+ struct hid_sensor_hub_device *hsdev =
+ data->hid_sensor_hub_client_devs[i].platform_data;
+ if (hsdev->pending.status)
+ complete(&hsdev->pending.ready);
+ }
+ spin_unlock_irqrestore(&data->lock, flags);
+ mfd_remove_devices(&hdev->dev);
+ 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,
+ .report_fixup = sensor_hub_report_fixup,
+#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");