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linux/drivers/hid/hid-sensor-hub.c
Kees Cook a86854d0c5 treewide: devm_kzalloc() -> devm_kcalloc() 
The devm_kzalloc() function has a 2-factor argument form, devm_kcalloc().
This patch replaces cases of:

        devm_kzalloc(handle, a * b, gfp)

with:
        devm_kcalloc(handle, a * b, gfp)

as well as handling cases of:

        devm_kzalloc(handle, a * b * c, gfp)

with:

        devm_kzalloc(handle, array3_size(a, b, c), gfp)

as it's slightly less ugly than:

        devm_kcalloc(handle, array_size(a, b), c, gfp)

This does, however, attempt to ignore constant size factors like:

        devm_kzalloc(handle, 4 * 1024, gfp)

though any constants defined via macros get caught up in the conversion.

Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.

Some manual whitespace fixes were needed in this patch, as Coccinelle
really liked to write "=devm_kcalloc..." instead of "= devm_kcalloc...".

The Coccinelle script used for this was:

// Fix redundant parens around sizeof().
@@
expression HANDLE;
type TYPE;
expression THING, E;
@@

(
  devm_kzalloc(HANDLE,
-	(sizeof(TYPE)) * E
+	sizeof(TYPE) * E
  , ...)
|
  devm_kzalloc(HANDLE,
-	(sizeof(THING)) * E
+	sizeof(THING) * E
  , ...)
)

// Drop single-byte sizes and redundant parens.
@@
expression HANDLE;
expression COUNT;
typedef u8;
typedef __u8;
@@

(
  devm_kzalloc(HANDLE,
-	sizeof(u8) * (COUNT)
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(__u8) * (COUNT)
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(char) * (COUNT)
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(unsigned char) * (COUNT)
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(u8) * COUNT
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(__u8) * COUNT
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(char) * COUNT
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(unsigned char) * COUNT
+	COUNT
  , ...)
)

// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
expression HANDLE;
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@

(
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * (COUNT_ID)
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * COUNT_ID
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * (COUNT_CONST)
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * COUNT_CONST
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * (COUNT_ID)
+	COUNT_ID, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * COUNT_ID
+	COUNT_ID, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * (COUNT_CONST)
+	COUNT_CONST, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * COUNT_CONST
+	COUNT_CONST, sizeof(THING)
  , ...)
)

// 2-factor product, only identifiers.
@@
expression HANDLE;
identifier SIZE, COUNT;
@@

- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	SIZE * COUNT
+	COUNT, SIZE
  , ...)

// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression HANDLE;
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@

(
  devm_kzalloc(HANDLE,
-	sizeof(TYPE) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
)

// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression HANDLE;
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@

(
  devm_kzalloc(HANDLE,
-	sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
)

// 3-factor product, only identifiers, with redundant parens removed.
@@
expression HANDLE;
identifier STRIDE, SIZE, COUNT;
@@

(
  devm_kzalloc(HANDLE,
-	(COUNT) * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	COUNT * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	COUNT * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(COUNT) * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	COUNT * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(COUNT) * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(COUNT) * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	COUNT * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
)

// Any remaining multi-factor products, first at least 3-factor products,
// when they're not all constants...
@@
expression HANDLE;
expression E1, E2, E3;
constant C1, C2, C3;
@@

(
  devm_kzalloc(HANDLE, C1 * C2 * C3, ...)
|
  devm_kzalloc(HANDLE,
-	(E1) * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(E1) * (E2) * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(E1) * (E2) * (E3)
+	array3_size(E1, E2, E3)
  , ...)
|
  devm_kzalloc(HANDLE,
-	E1 * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
)

// And then all remaining 2 factors products when they're not all constants,
// keeping sizeof() as the second factor argument.
@@
expression HANDLE;
expression THING, E1, E2;
type TYPE;
constant C1, C2, C3;
@@

(
  devm_kzalloc(HANDLE, sizeof(THING) * C2, ...)
|
  devm_kzalloc(HANDLE, sizeof(TYPE) * C2, ...)
|
  devm_kzalloc(HANDLE, C1 * C2 * C3, ...)
|
  devm_kzalloc(HANDLE, C1 * C2, ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * (E2)
+	E2, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * E2
+	E2, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * (E2)
+	E2, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * E2
+	E2, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	(E1) * E2
+	E1, E2
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	(E1) * (E2)
+	E1, E2
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	E1 * E2
+	E1, E2
  , ...)
)

Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-12 16:19:22 -07:00

757 lines
21 KiB
C
Raw Blame History

/*
* 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)
{
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:
ret_val = *(u8 *)hsdev->pending.raw_data;
break;
case 2:
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 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,
#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");
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