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linux/drivers/media/video/uvc/uvc_ctrl.c
Laurent Pinchart 04793dd041 V4L/DVB (8617): uvcvideo: don't use stack-based buffers for USB transfers. 
Data buffers on the stack are not allowed for USB I/O. Use dynamically
allocated buffers instead.

Signed-off-by: Bruce Schmid <duck@freescale.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@skynet.be>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-08-06 06:57:37 -03:00

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/*
* uvc_ctrl.c -- USB Video Class driver - Controls
*
* Copyright (C) 2005-2008
* Laurent Pinchart (laurent.pinchart@skynet.be)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
*/
#include <linux/kernel.h>
#include <linux/version.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/uaccess.h>
#include <linux/usb.h>
#include <linux/videodev2.h>
#include <linux/vmalloc.h>
#include <linux/wait.h>
#include <asm/atomic.h>
#include "uvcvideo.h"
#define UVC_CTRL_NDATA 2
#define UVC_CTRL_DATA_CURRENT 0
#define UVC_CTRL_DATA_BACKUP 1
/* ------------------------------------------------------------------------
* Control, formats, ...
*/
static struct uvc_control_info uvc_ctrls[] = {
{
.entity = UVC_GUID_UVC_PROCESSING,
.selector = PU_BRIGHTNESS_CONTROL,
.index = 0,
.size = 2,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
| UVC_CONTROL_RESTORE,
},
{
.entity = UVC_GUID_UVC_PROCESSING,
.selector = PU_CONTRAST_CONTROL,
.index = 1,
.size = 2,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
| UVC_CONTROL_RESTORE,
},
{
.entity = UVC_GUID_UVC_PROCESSING,
.selector = PU_HUE_CONTROL,
.index = 2,
.size = 2,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
| UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
},
{
.entity = UVC_GUID_UVC_PROCESSING,
.selector = PU_SATURATION_CONTROL,
.index = 3,
.size = 2,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
| UVC_CONTROL_RESTORE,
},
{
.entity = UVC_GUID_UVC_PROCESSING,
.selector = PU_SHARPNESS_CONTROL,
.index = 4,
.size = 2,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
| UVC_CONTROL_RESTORE,
},
{
.entity = UVC_GUID_UVC_PROCESSING,
.selector = PU_GAMMA_CONTROL,
.index = 5,
.size = 2,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
| UVC_CONTROL_RESTORE,
},
{
.entity = UVC_GUID_UVC_PROCESSING,
.selector = PU_BACKLIGHT_COMPENSATION_CONTROL,
.index = 8,
.size = 2,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
| UVC_CONTROL_RESTORE,
},
{
.entity = UVC_GUID_UVC_PROCESSING,
.selector = PU_GAIN_CONTROL,
.index = 9,
.size = 2,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
| UVC_CONTROL_RESTORE,
},
{
.entity = UVC_GUID_UVC_PROCESSING,
.selector = PU_POWER_LINE_FREQUENCY_CONTROL,
.index = 10,
.size = 1,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
| UVC_CONTROL_RESTORE,
},
{
.entity = UVC_GUID_UVC_PROCESSING,
.selector = PU_HUE_AUTO_CONTROL,
.index = 11,
.size = 1,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
| UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
},
{
.entity = UVC_GUID_UVC_CAMERA,
.selector = CT_AE_MODE_CONTROL,
.index = 1,
.size = 1,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
| UVC_CONTROL_GET_DEF | UVC_CONTROL_GET_RES
| UVC_CONTROL_RESTORE,
},
{
.entity = UVC_GUID_UVC_CAMERA,
.selector = CT_AE_PRIORITY_CONTROL,
.index = 2,
.size = 1,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
| UVC_CONTROL_RESTORE,
},
{
.entity = UVC_GUID_UVC_CAMERA,
.selector = CT_EXPOSURE_TIME_ABSOLUTE_CONTROL,
.index = 3,
.size = 4,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
| UVC_CONTROL_RESTORE,
},
{
.entity = UVC_GUID_UVC_CAMERA,
.selector = CT_FOCUS_ABSOLUTE_CONTROL,
.index = 5,
.size = 2,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
| UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
},
{
.entity = UVC_GUID_UVC_CAMERA,
.selector = CT_FOCUS_AUTO_CONTROL,
.index = 17,
.size = 1,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
| UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
},
{
.entity = UVC_GUID_UVC_PROCESSING,
.selector = PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL,
.index = 12,
.size = 1,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
| UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
},
{
.entity = UVC_GUID_UVC_PROCESSING,
.selector = PU_WHITE_BALANCE_TEMPERATURE_CONTROL,
.index = 6,
.size = 2,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
| UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
},
{
.entity = UVC_GUID_UVC_PROCESSING,
.selector = PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL,
.index = 13,
.size = 1,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
| UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
},
{
.entity = UVC_GUID_UVC_PROCESSING,
.selector = PU_WHITE_BALANCE_COMPONENT_CONTROL,
.index = 7,
.size = 4,
.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
| UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
},
};
static struct uvc_menu_info power_line_frequency_controls[] = {
{ 0, "Disabled" },
{ 1, "50 Hz" },
{ 2, "60 Hz" },
};
static struct uvc_menu_info exposure_auto_controls[] = {
{ 2, "Auto Mode" },
{ 1, "Manual Mode" },
{ 4, "Shutter Priority Mode" },
{ 8, "Aperture Priority Mode" },
};
static struct uvc_control_mapping uvc_ctrl_mappings[] = {
{
.id = V4L2_CID_BRIGHTNESS,
.name = "Brightness",
.entity = UVC_GUID_UVC_PROCESSING,
.selector = PU_BRIGHTNESS_CONTROL,
.size = 16,
.offset = 0,
.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
.data_type = UVC_CTRL_DATA_TYPE_SIGNED,
},
{
.id = V4L2_CID_CONTRAST,
.name = "Contrast",
.entity = UVC_GUID_UVC_PROCESSING,
.selector = PU_CONTRAST_CONTROL,
.size = 16,
.offset = 0,
.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
.data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
},
{
.id = V4L2_CID_HUE,
.name = "Hue",
.entity = UVC_GUID_UVC_PROCESSING,
.selector = PU_HUE_CONTROL,
.size = 16,
.offset = 0,
.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
.data_type = UVC_CTRL_DATA_TYPE_SIGNED,
},
{
.id = V4L2_CID_SATURATION,
.name = "Saturation",
.entity = UVC_GUID_UVC_PROCESSING,
.selector = PU_SATURATION_CONTROL,
.size = 16,
.offset = 0,
.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
.data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
},
{
.id = V4L2_CID_SHARPNESS,
.name = "Sharpness",
.entity = UVC_GUID_UVC_PROCESSING,
.selector = PU_SHARPNESS_CONTROL,
.size = 16,
.offset = 0,
.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
.data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
},
{
.id = V4L2_CID_GAMMA,
.name = "Gamma",
.entity = UVC_GUID_UVC_PROCESSING,
.selector = PU_GAMMA_CONTROL,
.size = 16,
.offset = 0,
.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
.data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
},
{
.id = V4L2_CID_BACKLIGHT_COMPENSATION,
.name = "Backlight Compensation",
.entity = UVC_GUID_UVC_PROCESSING,
.selector = PU_BACKLIGHT_COMPENSATION_CONTROL,
.size = 16,
.offset = 0,
.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
.data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
},
{
.id = V4L2_CID_GAIN,
.name = "Gain",
.entity = UVC_GUID_UVC_PROCESSING,
.selector = PU_GAIN_CONTROL,
.size = 16,
.offset = 0,
.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
.data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
},
{
.id = V4L2_CID_POWER_LINE_FREQUENCY,
.name = "Power Line Frequency",
.entity = UVC_GUID_UVC_PROCESSING,
.selector = PU_POWER_LINE_FREQUENCY_CONTROL,
.size = 2,
.offset = 0,
.v4l2_type = V4L2_CTRL_TYPE_MENU,
.data_type = UVC_CTRL_DATA_TYPE_ENUM,
.menu_info = power_line_frequency_controls,
.menu_count = ARRAY_SIZE(power_line_frequency_controls),
},
{
.id = V4L2_CID_HUE_AUTO,
.name = "Hue, Auto",
.entity = UVC_GUID_UVC_PROCESSING,
.selector = PU_HUE_AUTO_CONTROL,
.size = 1,
.offset = 0,
.v4l2_type = V4L2_CTRL_TYPE_BOOLEAN,
.data_type = UVC_CTRL_DATA_TYPE_BOOLEAN,
},
{
.id = V4L2_CID_EXPOSURE_AUTO,
.name = "Exposure, Auto",
.entity = UVC_GUID_UVC_CAMERA,
.selector = CT_AE_MODE_CONTROL,
.size = 4,
.offset = 0,
.v4l2_type = V4L2_CTRL_TYPE_MENU,
.data_type = UVC_CTRL_DATA_TYPE_BITMASK,
.menu_info = exposure_auto_controls,
.menu_count = ARRAY_SIZE(exposure_auto_controls),
},
{
.id = V4L2_CID_EXPOSURE_AUTO_PRIORITY,
.name = "Exposure, Auto Priority",
.entity = UVC_GUID_UVC_CAMERA,
.selector = CT_AE_PRIORITY_CONTROL,
.size = 1,
.offset = 0,
.v4l2_type = V4L2_CTRL_TYPE_BOOLEAN,
.data_type = UVC_CTRL_DATA_TYPE_BOOLEAN,
},
{
.id = V4L2_CID_EXPOSURE_ABSOLUTE,
.name = "Exposure (Absolute)",
.entity = UVC_GUID_UVC_CAMERA,
.selector = CT_EXPOSURE_TIME_ABSOLUTE_CONTROL,
.size = 32,
.offset = 0,
.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
.data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
},
{
.id = V4L2_CID_AUTO_WHITE_BALANCE,
.name = "White Balance Temperature, Auto",
.entity = UVC_GUID_UVC_PROCESSING,
.selector = PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL,
.size = 1,
.offset = 0,
.v4l2_type = V4L2_CTRL_TYPE_BOOLEAN,
.data_type = UVC_CTRL_DATA_TYPE_BOOLEAN,
},
{
.id = V4L2_CID_WHITE_BALANCE_TEMPERATURE,
.name = "White Balance Temperature",
.entity = UVC_GUID_UVC_PROCESSING,
.selector = PU_WHITE_BALANCE_TEMPERATURE_CONTROL,
.size = 16,
.offset = 0,
.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
.data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
},
{
.id = V4L2_CID_AUTO_WHITE_BALANCE,
.name = "White Balance Component, Auto",
.entity = UVC_GUID_UVC_PROCESSING,
.selector = PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL,
.size = 1,
.offset = 0,
.v4l2_type = V4L2_CTRL_TYPE_BOOLEAN,
.data_type = UVC_CTRL_DATA_TYPE_BOOLEAN,
},
{
.id = V4L2_CID_BLUE_BALANCE,
.name = "White Balance Blue Component",
.entity = UVC_GUID_UVC_PROCESSING,
.selector = PU_WHITE_BALANCE_COMPONENT_CONTROL,
.size = 16,
.offset = 0,
.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
.data_type = UVC_CTRL_DATA_TYPE_SIGNED,
},
{
.id = V4L2_CID_RED_BALANCE,
.name = "White Balance Red Component",
.entity = UVC_GUID_UVC_PROCESSING,
.selector = PU_WHITE_BALANCE_COMPONENT_CONTROL,
.size = 16,
.offset = 16,
.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
.data_type = UVC_CTRL_DATA_TYPE_SIGNED,
},
{
.id = V4L2_CID_FOCUS_ABSOLUTE,
.name = "Focus (absolute)",
.entity = UVC_GUID_UVC_CAMERA,
.selector = CT_FOCUS_ABSOLUTE_CONTROL,
.size = 16,
.offset = 0,
.v4l2_type = V4L2_CTRL_TYPE_INTEGER,
.data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
},
{
.id = V4L2_CID_FOCUS_AUTO,
.name = "Focus, Auto",
.entity = UVC_GUID_UVC_CAMERA,
.selector = CT_FOCUS_AUTO_CONTROL,
.size = 1,
.offset = 0,
.v4l2_type = V4L2_CTRL_TYPE_BOOLEAN,
.data_type = UVC_CTRL_DATA_TYPE_BOOLEAN,
},
};
/* ------------------------------------------------------------------------
* Utility functions
*/
static inline __u8 *uvc_ctrl_data(struct uvc_control *ctrl, int id)
{
return ctrl->data + id * ctrl->info->size;
}
static inline int uvc_get_bit(const __u8 *data, int bit)
{
return (data[bit >> 3] >> (bit & 7)) & 1;
}
/* Extract the bit string specified by mapping->offset and mapping->size
* from the little-endian data stored at 'data' and return the result as
* a signed 32bit integer. Sign extension will be performed if the mapping
* references a signed data type.
*/
static __s32 uvc_get_le_value(const __u8 *data,
struct uvc_control_mapping *mapping)
{
int bits = mapping->size;
int offset = mapping->offset;
__s32 value = 0;
__u8 mask;
data += offset / 8;
offset &= 7;
mask = ((1LL << bits) - 1) << offset;
for (; bits > 0; data++) {
__u8 byte = *data & mask;
value |= offset > 0 ? (byte >> offset) : (byte << (-offset));
bits -= 8 - (offset > 0 ? offset : 0);
offset -= 8;
mask = (1 << bits) - 1;
}
/* Sign-extend the value if needed */
if (mapping->data_type == UVC_CTRL_DATA_TYPE_SIGNED)
value |= -(value & (1 << (mapping->size - 1)));
return value;
}
/* Set the bit string specified by mapping->offset and mapping->size
* in the little-endian data stored at 'data' to the value 'value'.
*/
static void uvc_set_le_value(__s32 value, __u8 *data,
struct uvc_control_mapping *mapping)
{
int bits = mapping->size;
int offset = mapping->offset;
__u8 mask;
data += offset / 8;
offset &= 7;
for (; bits > 0; data++) {
mask = ((1LL << bits) - 1) << offset;
*data = (*data & ~mask) | ((value << offset) & mask);
value >>= offset ? offset : 8;
bits -= 8 - offset;
offset = 0;
}
}
/* ------------------------------------------------------------------------
* Terminal and unit management
*/
static const __u8 uvc_processing_guid[16] = UVC_GUID_UVC_PROCESSING;
static const __u8 uvc_camera_guid[16] = UVC_GUID_UVC_CAMERA;
static const __u8 uvc_media_transport_input_guid[16] =
UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT;
static int uvc_entity_match_guid(struct uvc_entity *entity, __u8 guid[16])
{
switch (UVC_ENTITY_TYPE(entity)) {
case ITT_CAMERA:
return memcmp(uvc_camera_guid, guid, 16) == 0;
case ITT_MEDIA_TRANSPORT_INPUT:
return memcmp(uvc_media_transport_input_guid, guid, 16) == 0;
case VC_PROCESSING_UNIT:
return memcmp(uvc_processing_guid, guid, 16) == 0;
case VC_EXTENSION_UNIT:
return memcmp(entity->extension.guidExtensionCode,
guid, 16) == 0;
default:
return 0;
}
}
/* ------------------------------------------------------------------------
* UVC Controls
*/
static void __uvc_find_control(struct uvc_entity *entity, __u32 v4l2_id,
struct uvc_control_mapping **mapping, struct uvc_control **control,
int next)
{
struct uvc_control *ctrl;
struct uvc_control_mapping *map;
unsigned int i;
if (entity == NULL)
return;
for (i = 0; i < entity->ncontrols; ++i) {
ctrl = &entity->controls[i];
if (ctrl->info == NULL)
continue;
list_for_each_entry(map, &ctrl->info->mappings, list) {
if ((map->id == v4l2_id) && !next) {
*control = ctrl;
*mapping = map;
return;
}
if ((*mapping == NULL || (*mapping)->id > map->id) &&
(map->id > v4l2_id) && next) {
*control = ctrl;
*mapping = map;
}
}
}
}
struct uvc_control *uvc_find_control(struct uvc_video_device *video,
__u32 v4l2_id, struct uvc_control_mapping **mapping)
{
struct uvc_control *ctrl = NULL;
struct uvc_entity *entity;
int next = v4l2_id & V4L2_CTRL_FLAG_NEXT_CTRL;
*mapping = NULL;
/* Mask the query flags. */
v4l2_id &= V4L2_CTRL_ID_MASK;
/* Find the control. */
__uvc_find_control(video->processing, v4l2_id, mapping, &ctrl, next);
if (ctrl && !next)
return ctrl;
list_for_each_entry(entity, &video->iterms, chain) {
__uvc_find_control(entity, v4l2_id, mapping, &ctrl, next);
if (ctrl && !next)
return ctrl;
}
list_for_each_entry(entity, &video->extensions, chain) {
__uvc_find_control(entity, v4l2_id, mapping, &ctrl, next);
if (ctrl && !next)
return ctrl;
}
if (ctrl == NULL && !next)
uvc_trace(UVC_TRACE_CONTROL, "Control 0x%08x not found.\n",
v4l2_id);
return ctrl;
}
int uvc_query_v4l2_ctrl(struct uvc_video_device *video,
struct v4l2_queryctrl *v4l2_ctrl)
{
struct uvc_control *ctrl;
struct uvc_control_mapping *mapping;
struct uvc_menu_info *menu;
unsigned int i;
__u8 *data;
int ret;
ctrl = uvc_find_control(video, v4l2_ctrl->id, &mapping);
if (ctrl == NULL)
return -EINVAL;
data = kmalloc(8, GFP_KERNEL);
if (data == NULL)
return -ENOMEM;
memset(v4l2_ctrl, 0, sizeof *v4l2_ctrl);
v4l2_ctrl->id = mapping->id;
v4l2_ctrl->type = mapping->v4l2_type;
strncpy(v4l2_ctrl->name, mapping->name, sizeof v4l2_ctrl->name);
v4l2_ctrl->flags = 0;
if (!(ctrl->info->flags & UVC_CONTROL_SET_CUR))
v4l2_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
if (ctrl->info->flags & UVC_CONTROL_GET_DEF) {
if ((ret = uvc_query_ctrl(video->dev, GET_DEF, ctrl->entity->id,
video->dev->intfnum, ctrl->info->selector,
data, ctrl->info->size)) < 0)
goto out;
v4l2_ctrl->default_value = uvc_get_le_value(data, mapping);
}
switch (mapping->v4l2_type) {
case V4L2_CTRL_TYPE_MENU:
v4l2_ctrl->minimum = 0;
v4l2_ctrl->maximum = mapping->menu_count - 1;
v4l2_ctrl->step = 1;
menu = mapping->menu_info;
for (i = 0; i < mapping->menu_count; ++i, ++menu) {
if (menu->value == v4l2_ctrl->default_value) {
v4l2_ctrl->default_value = i;
break;
}
}
ret = 0;
goto out;
case V4L2_CTRL_TYPE_BOOLEAN:
v4l2_ctrl->minimum = 0;
v4l2_ctrl->maximum = 1;
v4l2_ctrl->step = 1;
ret = 0;
goto out;
default:
break;
}
if (ctrl->info->flags & UVC_CONTROL_GET_MIN) {
if ((ret = uvc_query_ctrl(video->dev, GET_MIN, ctrl->entity->id,
video->dev->intfnum, ctrl->info->selector,
data, ctrl->info->size)) < 0)
goto out;
v4l2_ctrl->minimum = uvc_get_le_value(data, mapping);
}
if (ctrl->info->flags & UVC_CONTROL_GET_MAX) {
if ((ret = uvc_query_ctrl(video->dev, GET_MAX, ctrl->entity->id,
video->dev->intfnum, ctrl->info->selector,
data, ctrl->info->size)) < 0)
goto out;
v4l2_ctrl->maximum = uvc_get_le_value(data, mapping);
}
if (ctrl->info->flags & UVC_CONTROL_GET_RES) {
if ((ret = uvc_query_ctrl(video->dev, GET_RES, ctrl->entity->id,
video->dev->intfnum, ctrl->info->selector,
data, ctrl->info->size)) < 0)
goto out;
v4l2_ctrl->step = uvc_get_le_value(data, mapping);
}
ret = 0;
out:
kfree(data);
return ret;
}
/* --------------------------------------------------------------------------
* Control transactions
*
* To make extended set operations as atomic as the hardware allows, controls
* are handled using begin/commit/rollback operations.
*
* At the beginning of a set request, uvc_ctrl_begin should be called to
* initialize the request. This function acquires the control lock.
*
* When setting a control, the new value is stored in the control data field
* at position UVC_CTRL_DATA_CURRENT. The control is then marked as dirty for
* later processing. If the UVC and V4L2 control sizes differ, the current
* value is loaded from the hardware before storing the new value in the data
* field.
*
* After processing all controls in the transaction, uvc_ctrl_commit or
* uvc_ctrl_rollback must be called to apply the pending changes to the
* hardware or revert them. When applying changes, all controls marked as
* dirty will be modified in the UVC device, and the dirty flag will be
* cleared. When reverting controls, the control data field
* UVC_CTRL_DATA_CURRENT is reverted to its previous value
* (UVC_CTRL_DATA_BACKUP) for all dirty controls. Both functions release the
* control lock.
*/
int uvc_ctrl_begin(struct uvc_video_device *video)
{
return mutex_lock_interruptible(&video->ctrl_mutex) ? -ERESTARTSYS : 0;
}
static int uvc_ctrl_commit_entity(struct uvc_device *dev,
struct uvc_entity *entity, int rollback)
{
struct uvc_control *ctrl;
unsigned int i;
int ret;
if (entity == NULL)
return 0;
for (i = 0; i < entity->ncontrols; ++i) {
ctrl = &entity->controls[i];
if (ctrl->info == NULL || !ctrl->dirty)
continue;
if (!rollback)
ret = uvc_query_ctrl(dev, SET_CUR, ctrl->entity->id,
dev->intfnum, ctrl->info->selector,
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
ctrl->info->size);
else
ret = 0;
if (rollback || ret < 0)
memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
ctrl->info->size);
if ((ctrl->info->flags & UVC_CONTROL_GET_CUR) == 0)
ctrl->loaded = 0;
ctrl->dirty = 0;
if (ret < 0)
return ret;
}
return 0;
}
int __uvc_ctrl_commit(struct uvc_video_device *video, int rollback)
{
struct uvc_entity *entity;
int ret = 0;
/* Find the control. */
ret = uvc_ctrl_commit_entity(video->dev, video->processing, rollback);
if (ret < 0)
goto done;
list_for_each_entry(entity, &video->iterms, chain) {
ret = uvc_ctrl_commit_entity(video->dev, entity, rollback);
if (ret < 0)
goto done;
}
list_for_each_entry(entity, &video->extensions, chain) {
ret = uvc_ctrl_commit_entity(video->dev, entity, rollback);
if (ret < 0)
goto done;
}
done:
mutex_unlock(&video->ctrl_mutex);
return ret;
}
int uvc_ctrl_get(struct uvc_video_device *video,
struct v4l2_ext_control *xctrl)
{
struct uvc_control *ctrl;
struct uvc_control_mapping *mapping;
struct uvc_menu_info *menu;
unsigned int i;
int ret;
ctrl = uvc_find_control(video, xctrl->id, &mapping);
if (ctrl == NULL || (ctrl->info->flags & UVC_CONTROL_GET_CUR) == 0)
return -EINVAL;
if (!ctrl->loaded) {
ret = uvc_query_ctrl(video->dev, GET_CUR, ctrl->entity->id,
video->dev->intfnum, ctrl->info->selector,
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
ctrl->info->size);
if (ret < 0)
return ret;
if ((ctrl->info->flags & UVC_CONTROL_AUTO_UPDATE) == 0)
ctrl->loaded = 1;
}
xctrl->value = uvc_get_le_value(
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT), mapping);
if (mapping->v4l2_type == V4L2_CTRL_TYPE_MENU) {
menu = mapping->menu_info;
for (i = 0; i < mapping->menu_count; ++i, ++menu) {
if (menu->value == xctrl->value) {
xctrl->value = i;
break;
}
}
}
return 0;
}
int uvc_ctrl_set(struct uvc_video_device *video,
struct v4l2_ext_control *xctrl)
{
struct uvc_control *ctrl;
struct uvc_control_mapping *mapping;
s32 value = xctrl->value;
int ret;
ctrl = uvc_find_control(video, xctrl->id, &mapping);
if (ctrl == NULL || (ctrl->info->flags & UVC_CONTROL_SET_CUR) == 0)
return -EINVAL;
if (mapping->v4l2_type == V4L2_CTRL_TYPE_MENU) {
if (value < 0 || value >= mapping->menu_count)
return -EINVAL;
value = mapping->menu_info[value].value;
}
if (!ctrl->loaded && (ctrl->info->size * 8) != mapping->size) {
if ((ctrl->info->flags & UVC_CONTROL_GET_CUR) == 0) {
memset(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
0, ctrl->info->size);
} else {
ret = uvc_query_ctrl(video->dev, GET_CUR,
ctrl->entity->id, video->dev->intfnum,
ctrl->info->selector,
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
ctrl->info->size);
if (ret < 0)
return ret;
}
if ((ctrl->info->flags & UVC_CONTROL_AUTO_UPDATE) == 0)
ctrl->loaded = 1;
}
if (!ctrl->dirty) {
memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
ctrl->info->size);
}
uvc_set_le_value(value,
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT), mapping);
ctrl->dirty = 1;
ctrl->modified = 1;
return 0;
}
/* --------------------------------------------------------------------------
* Dynamic controls
*/
int uvc_xu_ctrl_query(struct uvc_video_device *video,
struct uvc_xu_control *xctrl, int set)
{
struct uvc_entity *entity;
struct uvc_control *ctrl = NULL;
unsigned int i, found = 0;
__u8 *data;
int ret;
/* Find the extension unit. */
list_for_each_entry(entity, &video->extensions, chain) {
if (entity->id == xctrl->unit)
break;
}
if (entity->id != xctrl->unit) {
uvc_trace(UVC_TRACE_CONTROL, "Extension unit %u not found.\n",
xctrl->unit);
return -EINVAL;
}
/* Find the control. */
for (i = 0; i < entity->ncontrols; ++i) {
ctrl = &entity->controls[i];
if (ctrl->info == NULL)
continue;
if (ctrl->info->selector == xctrl->selector) {
found = 1;
break;
}
}
if (!found) {
uvc_trace(UVC_TRACE_CONTROL,
"Control " UVC_GUID_FORMAT "/%u not found.\n",
UVC_GUID_ARGS(entity->extension.guidExtensionCode),
xctrl->selector);
return -EINVAL;
}
/* Validate control data size. */
if (ctrl->info->size != xctrl->size)
return -EINVAL;
if ((set && !(ctrl->info->flags & UVC_CONTROL_SET_CUR)) ||
(!set && !(ctrl->info->flags & UVC_CONTROL_GET_CUR)))
return -EINVAL;
if (mutex_lock_interruptible(&video->ctrl_mutex))
return -ERESTARTSYS;
memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
xctrl->size);
data = uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT);
if (set && copy_from_user(data, xctrl->data, xctrl->size)) {
ret = -EFAULT;
goto out;
}
ret = uvc_query_ctrl(video->dev, set ? SET_CUR : GET_CUR, xctrl->unit,
video->dev->intfnum, xctrl->selector, data,
xctrl->size);
if (ret < 0)
goto out;
if (!set && copy_to_user(xctrl->data, data, xctrl->size)) {
ret = -EFAULT;
goto out;
}
out:
if (ret)
memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
xctrl->size);
mutex_unlock(&video->ctrl_mutex);
return ret;
}
/* --------------------------------------------------------------------------
* Suspend/resume
*/
/*
* Restore control values after resume, skipping controls that haven't been
* changed.
*
* TODO
* - Don't restore modified controls that are back to their default value.
* - Handle restore order (Auto-Exposure Mode should be restored before
* Exposure Time).
*/
int uvc_ctrl_resume_device(struct uvc_device *dev)
{
struct uvc_control *ctrl;
struct uvc_entity *entity;
unsigned int i;
int ret;
/* Walk the entities list and restore controls when possible. */
list_for_each_entry(entity, &dev->entities, list) {
for (i = 0; i < entity->ncontrols; ++i) {
ctrl = &entity->controls[i];
if (ctrl->info == NULL || !ctrl->modified ||
(ctrl->info->flags & UVC_CONTROL_RESTORE) == 0)
continue;
printk(KERN_INFO "restoring control " UVC_GUID_FORMAT
"/%u/%u\n", UVC_GUID_ARGS(ctrl->info->entity),
ctrl->info->index, ctrl->info->selector);
ctrl->dirty = 1;
}
ret = uvc_ctrl_commit_entity(dev, entity, 0);
if (ret < 0)
return ret;
}
return 0;
}
/* --------------------------------------------------------------------------
* Control and mapping handling
*/
static void uvc_ctrl_add_ctrl(struct uvc_device *dev,
struct uvc_control_info *info)
{
struct uvc_entity *entity;
struct uvc_control *ctrl = NULL;
int ret, found = 0;
unsigned int i;
list_for_each_entry(entity, &dev->entities, list) {
if (!uvc_entity_match_guid(entity, info->entity))
continue;
for (i = 0; i < entity->ncontrols; ++i) {
ctrl = &entity->controls[i];
if (ctrl->index == info->index) {
found = 1;
break;
}
}
if (found)
break;
}
if (!found)
return;
if (UVC_ENTITY_TYPE(entity) == VC_EXTENSION_UNIT) {
/* Check if the device control information and length match
* the user supplied information.
*/
__u32 flags;
__le16 size;
__u8 inf;
if ((ret = uvc_query_ctrl(dev, GET_LEN, ctrl->entity->id,
dev->intfnum, info->selector, (__u8 *)&size, 2)) < 0) {
uvc_trace(UVC_TRACE_CONTROL, "GET_LEN failed on "
"control " UVC_GUID_FORMAT "/%u (%d).\n",
UVC_GUID_ARGS(info->entity), info->selector,
ret);
return;
}
if (info->size != le16_to_cpu(size)) {
uvc_trace(UVC_TRACE_CONTROL, "Control " UVC_GUID_FORMAT
"/%u size doesn't match user supplied "
"value.\n", UVC_GUID_ARGS(info->entity),
info->selector);
return;
}
if ((ret = uvc_query_ctrl(dev, GET_INFO, ctrl->entity->id,
dev->intfnum, info->selector, &inf, 1)) < 0) {
uvc_trace(UVC_TRACE_CONTROL, "GET_INFO failed on "
"control " UVC_GUID_FORMAT "/%u (%d).\n",
UVC_GUID_ARGS(info->entity), info->selector,
ret);
return;
}
flags = info->flags;
if (((flags & UVC_CONTROL_GET_CUR) && !(inf & (1 << 0))) ||
((flags & UVC_CONTROL_SET_CUR) && !(inf & (1 << 1)))) {
uvc_trace(UVC_TRACE_CONTROL, "Control "
UVC_GUID_FORMAT "/%u flags don't match "
"supported operations.\n",
UVC_GUID_ARGS(info->entity), info->selector);
return;
}
}
ctrl->info = info;
ctrl->data = kmalloc(ctrl->info->size * UVC_CTRL_NDATA, GFP_KERNEL);
uvc_trace(UVC_TRACE_CONTROL, "Added control " UVC_GUID_FORMAT "/%u "
"to device %s entity %u\n", UVC_GUID_ARGS(ctrl->info->entity),
ctrl->info->selector, dev->udev->devpath, entity->id);
}
/*
* Add an item to the UVC control information list, and instantiate a control
* structure for each device that supports the control.
*/
int uvc_ctrl_add_info(struct uvc_control_info *info)
{
struct uvc_control_info *ctrl;
struct uvc_device *dev;
int ret = 0;
/* Find matching controls by walking the devices, entities and
* controls list.
*/
mutex_lock(&uvc_driver.ctrl_mutex);
/* First check if the list contains a control matching the new one.
* Bail out if it does.
*/
list_for_each_entry(ctrl, &uvc_driver.controls, list) {
if (memcmp(ctrl->entity, info->entity, 16))
continue;
if (ctrl->selector == info->selector) {
uvc_trace(UVC_TRACE_CONTROL, "Control "
UVC_GUID_FORMAT "/%u is already defined.\n",
UVC_GUID_ARGS(info->entity), info->selector);
ret = -EEXIST;
goto end;
}
if (ctrl->index == info->index) {
uvc_trace(UVC_TRACE_CONTROL, "Control "
UVC_GUID_FORMAT "/%u would overwrite index "
"%d.\n", UVC_GUID_ARGS(info->entity),
info->selector, info->index);
ret = -EEXIST;
goto end;
}
}
list_for_each_entry(dev, &uvc_driver.devices, list)
uvc_ctrl_add_ctrl(dev, info);
INIT_LIST_HEAD(&info->mappings);
list_add_tail(&info->list, &uvc_driver.controls);
end:
mutex_unlock(&uvc_driver.ctrl_mutex);
return ret;
}
int uvc_ctrl_add_mapping(struct uvc_control_mapping *mapping)
{
struct uvc_control_info *info;
struct uvc_control_mapping *map;
int ret = -EINVAL;
if (mapping->id & ~V4L2_CTRL_ID_MASK) {
uvc_trace(UVC_TRACE_CONTROL, "Can't add mapping '%s' with "
"invalid control id 0x%08x\n", mapping->name,
mapping->id);
return -EINVAL;
}
mutex_lock(&uvc_driver.ctrl_mutex);
list_for_each_entry(info, &uvc_driver.controls, list) {
if (memcmp(info->entity, mapping->entity, 16) ||
info->selector != mapping->selector)
continue;
if (info->size * 8 < mapping->size + mapping->offset) {
uvc_trace(UVC_TRACE_CONTROL, "Mapping '%s' would "
"overflow control " UVC_GUID_FORMAT "/%u\n",
mapping->name, UVC_GUID_ARGS(info->entity),
info->selector);
ret = -EOVERFLOW;
goto end;
}
/* Check if the list contains a mapping matching the new one.
* Bail out if it does.
*/
list_for_each_entry(map, &info->mappings, list) {
if (map->id == mapping->id) {
uvc_trace(UVC_TRACE_CONTROL, "Mapping '%s' is "
"already defined.\n", mapping->name);
ret = -EEXIST;
goto end;
}
}
mapping->ctrl = info;
list_add_tail(&mapping->list, &info->mappings);
uvc_trace(UVC_TRACE_CONTROL, "Adding mapping %s to control "
UVC_GUID_FORMAT "/%u.\n", mapping->name,
UVC_GUID_ARGS(info->entity), info->selector);
ret = 0;
break;
}
end:
mutex_unlock(&uvc_driver.ctrl_mutex);
return ret;
}
/*
* Initialize device controls.
*/
int uvc_ctrl_init_device(struct uvc_device *dev)
{
struct uvc_control_info *info;
struct uvc_control *ctrl;
struct uvc_entity *entity;
unsigned int i;
/* Walk the entities list and instantiate controls */
list_for_each_entry(entity, &dev->entities, list) {
unsigned int bControlSize = 0, ncontrols = 0;
__u8 *bmControls = NULL;
if (UVC_ENTITY_TYPE(entity) == VC_EXTENSION_UNIT) {
bmControls = entity->extension.bmControls;
bControlSize = entity->extension.bControlSize;
} else if (UVC_ENTITY_TYPE(entity) == VC_PROCESSING_UNIT) {
bmControls = entity->processing.bmControls;
bControlSize = entity->processing.bControlSize;
} else if (UVC_ENTITY_TYPE(entity) == ITT_CAMERA) {
bmControls = entity->camera.bmControls;
bControlSize = entity->camera.bControlSize;
}
for (i = 0; i < bControlSize; ++i)
ncontrols += hweight8(bmControls[i]);
if (ncontrols == 0)
continue;
entity->controls = kzalloc(ncontrols*sizeof *ctrl, GFP_KERNEL);
if (entity->controls == NULL)
return -ENOMEM;
entity->ncontrols = ncontrols;
ctrl = entity->controls;
for (i = 0; i < bControlSize * 8; ++i) {
if (uvc_get_bit(bmControls, i) == 0)
continue;
ctrl->entity = entity;
ctrl->index = i;
ctrl++;
}
}
/* Walk the controls info list and associate them with the device
* controls, then add the device to the global device list. This has
* to be done while holding the controls lock, to make sure
* uvc_ctrl_add_info() will not get called in-between.
*/
mutex_lock(&uvc_driver.ctrl_mutex);
list_for_each_entry(info, &uvc_driver.controls, list)
uvc_ctrl_add_ctrl(dev, info);
list_add_tail(&dev->list, &uvc_driver.devices);
mutex_unlock(&uvc_driver.ctrl_mutex);
return 0;
}
/*
* Cleanup device controls.
*/
void uvc_ctrl_cleanup_device(struct uvc_device *dev)
{
struct uvc_entity *entity;
unsigned int i;
/* Remove the device from the global devices list */
mutex_lock(&uvc_driver.ctrl_mutex);
if (dev->list.next != NULL)
list_del(&dev->list);
mutex_unlock(&uvc_driver.ctrl_mutex);
list_for_each_entry(entity, &dev->entities, list) {
for (i = 0; i < entity->ncontrols; ++i)
kfree(entity->controls[i].data);
kfree(entity->controls);
}
}
void uvc_ctrl_init(void)
{
struct uvc_control_info *ctrl = uvc_ctrls;
struct uvc_control_info *cend = ctrl + ARRAY_SIZE(uvc_ctrls);
struct uvc_control_mapping *mapping = uvc_ctrl_mappings;
struct uvc_control_mapping *mend =
mapping + ARRAY_SIZE(uvc_ctrl_mappings);
for (; ctrl < cend; ++ctrl)
uvc_ctrl_add_info(ctrl);
for (; mapping < mend; ++mapping)
uvc_ctrl_add_mapping(mapping);
}
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