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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/drivers/usb/gadget/function/uvc_configfs.c

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// SPDX-License-Identifier: GPL-2.0
/*
* uvc_configfs.c
*
* Configfs support for the uvc function.
*
* Copyright (c) 2014 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* Author: Andrzej Pietrasiewicz <andrzejtp2010@gmail.com>
*/
#include <linux/sort.h>
#include "u_uvc.h"
#include "uvc_configfs.h"
/* -----------------------------------------------------------------------------
* Global Utility Structures and Macros
*/
#define UVCG_STREAMING_CONTROL_SIZE 1
#define UVC_ATTR(prefix, cname, aname) \
static struct configfs_attribute prefix##attr_##cname = { \
.ca_name = __stringify(aname), \
.ca_mode = S_IRUGO | S_IWUGO, \
.ca_owner = THIS_MODULE, \
.show = prefix##cname##_show, \
.store = prefix##cname##_store, \
}
#define UVC_ATTR_RO(prefix, cname, aname) \
static struct configfs_attribute prefix##attr_##cname = { \
.ca_name = __stringify(aname), \
.ca_mode = S_IRUGO, \
.ca_owner = THIS_MODULE, \
.show = prefix##cname##_show, \
}
#define le8_to_cpu(x) (x)
#define cpu_to_le8(x) (x)
static int uvcg_config_compare_u32(const void *l, const void *r)
{
u32 li = *(const u32 *)l;
u32 ri = *(const u32 *)r;
return li < ri ? -1 : li == ri ? 0 : 1;
}
static inline struct f_uvc_opts *to_f_uvc_opts(struct config_item *item)
{
return container_of(to_config_group(item), struct f_uvc_opts,
func_inst.group);
}
struct uvcg_config_group_type {
struct config_item_type type;
const char *name;
const struct uvcg_config_group_type **children;
int (*create_children)(struct config_group *group);
};
static void uvcg_config_item_release(struct config_item *item)
{
struct config_group *group = to_config_group(item);
kfree(group);
}
static struct configfs_item_operations uvcg_config_item_ops = {
.release = uvcg_config_item_release,
};
static int uvcg_config_create_group(struct config_group *parent,
const struct uvcg_config_group_type *type);
static int uvcg_config_create_children(struct config_group *group,
const struct uvcg_config_group_type *type)
{
const struct uvcg_config_group_type **child;
int ret;
if (type->create_children)
return type->create_children(group);
for (child = type->children; child && *child; ++child) {
ret = uvcg_config_create_group(group, *child);
if (ret < 0)
return ret;
}
return 0;
}
static int uvcg_config_create_group(struct config_group *parent,
const struct uvcg_config_group_type *type)
{
struct config_group *group;
group = kzalloc(sizeof(*group), GFP_KERNEL);
if (!group)
return -ENOMEM;
config_group_init_type_name(group, type->name, &type->type);
configfs_add_default_group(group, parent);
return uvcg_config_create_children(group, type);
}
static void uvcg_config_remove_children(struct config_group *group)
{
struct config_group *child, *n;
list_for_each_entry_safe(child, n, &group->default_groups, group_entry) {
list_del(&child->group_entry);
uvcg_config_remove_children(child);
config_item_put(&child->cg_item);
}
}
/* -----------------------------------------------------------------------------
* control/header/<NAME>
* control/header
*/
DECLARE_UVC_HEADER_DESCRIPTOR(1);
struct uvcg_control_header {
struct config_item item;
struct UVC_HEADER_DESCRIPTOR(1) desc;
unsigned linked;
};
static struct uvcg_control_header *to_uvcg_control_header(struct config_item *item)
{
return container_of(item, struct uvcg_control_header, item);
}
#define UVCG_CTRL_HDR_ATTR(cname, aname, bits, limit) \
static ssize_t uvcg_control_header_##cname##_show( \
struct config_item *item, char *page) \
{ \
struct uvcg_control_header *ch = to_uvcg_control_header(item); \
struct f_uvc_opts *opts; \
struct config_item *opts_item; \
struct mutex *su_mutex = &ch->item.ci_group->cg_subsys->su_mutex;\
int result; \
\
mutex_lock(su_mutex); /* for navigating configfs hierarchy */ \
\
opts_item = ch->item.ci_parent->ci_parent->ci_parent; \
opts = to_f_uvc_opts(opts_item); \
\
mutex_lock(&opts->lock); \
result = sprintf(page, "%u\n", le##bits##_to_cpu(ch->desc.aname));\
mutex_unlock(&opts->lock); \
\
mutex_unlock(su_mutex); \
return result; \
} \
\
static ssize_t \
uvcg_control_header_##cname##_store(struct config_item *item, \
const char *page, size_t len) \
{ \
struct uvcg_control_header *ch = to_uvcg_control_header(item); \
struct f_uvc_opts *opts; \
struct config_item *opts_item; \
struct mutex *su_mutex = &ch->item.ci_group->cg_subsys->su_mutex;\
int ret; \
u##bits num; \
\
mutex_lock(su_mutex); /* for navigating configfs hierarchy */ \
\
opts_item = ch->item.ci_parent->ci_parent->ci_parent; \
opts = to_f_uvc_opts(opts_item); \
\
mutex_lock(&opts->lock); \
if (ch->linked || opts->refcnt) { \
ret = -EBUSY; \
goto end; \
} \
\
ret = kstrtou##bits(page, 0, &num); \
if (ret) \
goto end; \
\
if (num > limit) { \
ret = -EINVAL; \
goto end; \
} \
ch->desc.aname = cpu_to_le##bits(num); \
ret = len; \
end: \
mutex_unlock(&opts->lock); \
mutex_unlock(su_mutex); \
return ret; \
} \
\
UVC_ATTR(uvcg_control_header_, cname, aname)
UVCG_CTRL_HDR_ATTR(bcd_uvc, bcdUVC, 16, 0xffff);
UVCG_CTRL_HDR_ATTR(dw_clock_frequency, dwClockFrequency, 32, 0x7fffffff);
#undef UVCG_CTRL_HDR_ATTR
static struct configfs_attribute *uvcg_control_header_attrs[] = {
&uvcg_control_header_attr_bcd_uvc,
&uvcg_control_header_attr_dw_clock_frequency,
NULL,
};
static const struct config_item_type uvcg_control_header_type = {
.ct_item_ops = &uvcg_config_item_ops,
.ct_attrs = uvcg_control_header_attrs,
.ct_owner = THIS_MODULE,
};
static struct config_item *uvcg_control_header_make(struct config_group *group,
const char *name)
{
struct uvcg_control_header *h;
h = kzalloc(sizeof(*h), GFP_KERNEL);
if (!h)
return ERR_PTR(-ENOMEM);
h->desc.bLength = UVC_DT_HEADER_SIZE(1);
h->desc.bDescriptorType = USB_DT_CS_INTERFACE;
h->desc.bDescriptorSubType = UVC_VC_HEADER;
h->desc.bcdUVC = cpu_to_le16(0x0110);
h->desc.dwClockFrequency = cpu_to_le32(48000000);
config_item_init_type_name(&h->item, name, &uvcg_control_header_type);
return &h->item;
}
static struct configfs_group_operations uvcg_control_header_grp_ops = {
.make_item = uvcg_control_header_make,
};
static const struct uvcg_config_group_type uvcg_control_header_grp_type = {
.type = {
.ct_item_ops = &uvcg_config_item_ops,
.ct_group_ops = &uvcg_control_header_grp_ops,
.ct_owner = THIS_MODULE,
},
.name = "header",
};
/* -----------------------------------------------------------------------------
* control/processing/default
*/
#define UVCG_DEFAULT_PROCESSING_ATTR(cname, aname, bits) \
static ssize_t uvcg_default_processing_##cname##_show( \
struct config_item *item, char *page) \
{ \
struct config_group *group = to_config_group(item); \
struct f_uvc_opts *opts; \
struct config_item *opts_item; \
struct mutex *su_mutex = &group->cg_subsys->su_mutex; \
struct uvc_processing_unit_descriptor *pd; \
int result; \
\
mutex_lock(su_mutex); /* for navigating configfs hierarchy */ \
\
opts_item = group->cg_item.ci_parent->ci_parent->ci_parent; \
opts = to_f_uvc_opts(opts_item); \
pd = &opts->uvc_processing; \
\
mutex_lock(&opts->lock); \
result = sprintf(page, "%u\n", le##bits##_to_cpu(pd->aname)); \
mutex_unlock(&opts->lock); \
\
mutex_unlock(su_mutex); \
return result; \
} \
\
UVC_ATTR_RO(uvcg_default_processing_, cname, aname)
UVCG_DEFAULT_PROCESSING_ATTR(b_unit_id, bUnitID, 8);
UVCG_DEFAULT_PROCESSING_ATTR(b_source_id, bSourceID, 8);
UVCG_DEFAULT_PROCESSING_ATTR(w_max_multiplier, wMaxMultiplier, 16);
UVCG_DEFAULT_PROCESSING_ATTR(i_processing, iProcessing, 8);
#undef UVCG_DEFAULT_PROCESSING_ATTR
static ssize_t uvcg_default_processing_bm_controls_show(
struct config_item *item, char *page)
{
struct config_group *group = to_config_group(item);
struct f_uvc_opts *opts;
struct config_item *opts_item;
struct mutex *su_mutex = &group->cg_subsys->su_mutex;
struct uvc_processing_unit_descriptor *pd;
int result, i;
char *pg = page;
mutex_lock(su_mutex); /* for navigating configfs hierarchy */
opts_item = group->cg_item.ci_parent->ci_parent->ci_parent;
opts = to_f_uvc_opts(opts_item);
pd = &opts->uvc_processing;
mutex_lock(&opts->lock);
for (result = 0, i = 0; i < pd->bControlSize; ++i) {
result += sprintf(pg, "%u\n", pd->bmControls[i]);
pg = page + result;
}
mutex_unlock(&opts->lock);
mutex_unlock(su_mutex);
return result;
}
UVC_ATTR_RO(uvcg_default_processing_, bm_controls, bmControls);
static struct configfs_attribute *uvcg_default_processing_attrs[] = {
&uvcg_default_processing_attr_b_unit_id,
&uvcg_default_processing_attr_b_source_id,
&uvcg_default_processing_attr_w_max_multiplier,
&uvcg_default_processing_attr_bm_controls,
&uvcg_default_processing_attr_i_processing,
NULL,
};
static const struct uvcg_config_group_type uvcg_default_processing_type = {
.type = {
.ct_item_ops = &uvcg_config_item_ops,
.ct_attrs = uvcg_default_processing_attrs,
.ct_owner = THIS_MODULE,
},
.name = "default",
};
/* -----------------------------------------------------------------------------
* control/processing
*/
static const struct uvcg_config_group_type uvcg_processing_grp_type = {
.type = {
.ct_item_ops = &uvcg_config_item_ops,
.ct_owner = THIS_MODULE,
},
.name = "processing",
.children = (const struct uvcg_config_group_type*[]) {
&uvcg_default_processing_type,
NULL,
},
};
/* -----------------------------------------------------------------------------
* control/terminal/camera/default
*/
#define UVCG_DEFAULT_CAMERA_ATTR(cname, aname, bits) \
static ssize_t uvcg_default_camera_##cname##_show( \
struct config_item *item, char *page) \
{ \
struct config_group *group = to_config_group(item); \
struct f_uvc_opts *opts; \
struct config_item *opts_item; \
struct mutex *su_mutex = &group->cg_subsys->su_mutex; \
struct uvc_camera_terminal_descriptor *cd; \
int result; \
\
mutex_lock(su_mutex); /* for navigating configfs hierarchy */ \
\
opts_item = group->cg_item.ci_parent->ci_parent->ci_parent-> \
ci_parent; \
opts = to_f_uvc_opts(opts_item); \
cd = &opts->uvc_camera_terminal; \
\
mutex_lock(&opts->lock); \
result = sprintf(page, "%u\n", le##bits##_to_cpu(cd->aname)); \
mutex_unlock(&opts->lock); \
\
mutex_unlock(su_mutex); \
\
return result; \
} \
\
UVC_ATTR_RO(uvcg_default_camera_, cname, aname)
UVCG_DEFAULT_CAMERA_ATTR(b_terminal_id, bTerminalID, 8);
UVCG_DEFAULT_CAMERA_ATTR(w_terminal_type, wTerminalType, 16);
UVCG_DEFAULT_CAMERA_ATTR(b_assoc_terminal, bAssocTerminal, 8);
UVCG_DEFAULT_CAMERA_ATTR(i_terminal, iTerminal, 8);
UVCG_DEFAULT_CAMERA_ATTR(w_objective_focal_length_min, wObjectiveFocalLengthMin,
16);
UVCG_DEFAULT_CAMERA_ATTR(w_objective_focal_length_max, wObjectiveFocalLengthMax,
16);
UVCG_DEFAULT_CAMERA_ATTR(w_ocular_focal_length, wOcularFocalLength,
16);
#undef UVCG_DEFAULT_CAMERA_ATTR
static ssize_t uvcg_default_camera_bm_controls_show(
struct config_item *item, char *page)
{
struct config_group *group = to_config_group(item);
struct f_uvc_opts *opts;
struct config_item *opts_item;
struct mutex *su_mutex = &group->cg_subsys->su_mutex;
struct uvc_camera_terminal_descriptor *cd;
int result, i;
char *pg = page;
mutex_lock(su_mutex); /* for navigating configfs hierarchy */
opts_item = group->cg_item.ci_parent->ci_parent->ci_parent->
ci_parent;
opts = to_f_uvc_opts(opts_item);
cd = &opts->uvc_camera_terminal;
mutex_lock(&opts->lock);
for (result = 0, i = 0; i < cd->bControlSize; ++i) {
result += sprintf(pg, "%u\n", cd->bmControls[i]);
pg = page + result;
}
mutex_unlock(&opts->lock);
mutex_unlock(su_mutex);
return result;
}
UVC_ATTR_RO(uvcg_default_camera_, bm_controls, bmControls);
static struct configfs_attribute *uvcg_default_camera_attrs[] = {
&uvcg_default_camera_attr_b_terminal_id,
&uvcg_default_camera_attr_w_terminal_type,
&uvcg_default_camera_attr_b_assoc_terminal,
&uvcg_default_camera_attr_i_terminal,
&uvcg_default_camera_attr_w_objective_focal_length_min,
&uvcg_default_camera_attr_w_objective_focal_length_max,
&uvcg_default_camera_attr_w_ocular_focal_length,
&uvcg_default_camera_attr_bm_controls,
NULL,
};
static const struct uvcg_config_group_type uvcg_default_camera_type = {
.type = {
.ct_item_ops = &uvcg_config_item_ops,
.ct_attrs = uvcg_default_camera_attrs,
.ct_owner = THIS_MODULE,
},
.name = "default",
};
/* -----------------------------------------------------------------------------
* control/terminal/camera
*/
static const struct uvcg_config_group_type uvcg_camera_grp_type = {
.type = {
.ct_item_ops = &uvcg_config_item_ops,
.ct_owner = THIS_MODULE,
},
.name = "camera",
.children = (const struct uvcg_config_group_type*[]) {
&uvcg_default_camera_type,
NULL,
},
};
/* -----------------------------------------------------------------------------
* control/terminal/output/default
*/
#define UVCG_DEFAULT_OUTPUT_ATTR(cname, aname, bits) \
static ssize_t uvcg_default_output_##cname##_show( \
struct config_item *item, char *page) \
{ \
struct config_group *group = to_config_group(item); \
struct f_uvc_opts *opts; \
struct config_item *opts_item; \
struct mutex *su_mutex = &group->cg_subsys->su_mutex; \
struct uvc_output_terminal_descriptor *cd; \
int result; \
\
mutex_lock(su_mutex); /* for navigating configfs hierarchy */ \
\
opts_item = group->cg_item.ci_parent->ci_parent-> \
ci_parent->ci_parent; \
opts = to_f_uvc_opts(opts_item); \
cd = &opts->uvc_output_terminal; \
\
mutex_lock(&opts->lock); \
result = sprintf(page, "%u\n", le##bits##_to_cpu(cd->aname)); \
mutex_unlock(&opts->lock); \
\
mutex_unlock(su_mutex); \
\
return result; \
} \
\
UVC_ATTR_RO(uvcg_default_output_, cname, aname)
UVCG_DEFAULT_OUTPUT_ATTR(b_terminal_id, bTerminalID, 8);
UVCG_DEFAULT_OUTPUT_ATTR(w_terminal_type, wTerminalType, 16);
UVCG_DEFAULT_OUTPUT_ATTR(b_assoc_terminal, bAssocTerminal, 8);
UVCG_DEFAULT_OUTPUT_ATTR(i_terminal, iTerminal, 8);
#undef UVCG_DEFAULT_OUTPUT_ATTR
static ssize_t uvcg_default_output_b_source_id_show(struct config_item *item,
char *page)
{
struct config_group *group = to_config_group(item);
struct f_uvc_opts *opts;
struct config_item *opts_item;
struct mutex *su_mutex = &group->cg_subsys->su_mutex;
struct uvc_output_terminal_descriptor *cd;
int result;
mutex_lock(su_mutex); /* for navigating configfs hierarchy */
opts_item = group->cg_item.ci_parent->ci_parent->
ci_parent->ci_parent;
opts = to_f_uvc_opts(opts_item);
cd = &opts->uvc_output_terminal;
mutex_lock(&opts->lock);
result = sprintf(page, "%u\n", le8_to_cpu(cd->bSourceID));
mutex_unlock(&opts->lock);
mutex_unlock(su_mutex);
return result;
}
static ssize_t uvcg_default_output_b_source_id_store(struct config_item *item,
const char *page, size_t len)
{
struct config_group *group = to_config_group(item);
struct f_uvc_opts *opts;
struct config_item *opts_item;
struct mutex *su_mutex = &group->cg_subsys->su_mutex;
struct uvc_output_terminal_descriptor *cd;
int result;
u8 num;
result = kstrtou8(page, 0, &num);
if (result)
return result;
mutex_lock(su_mutex); /* for navigating configfs hierarchy */
opts_item = group->cg_item.ci_parent->ci_parent->
ci_parent->ci_parent;
opts = to_f_uvc_opts(opts_item);
cd = &opts->uvc_output_terminal;
mutex_lock(&opts->lock);
cd->bSourceID = num;
mutex_unlock(&opts->lock);
mutex_unlock(su_mutex);
return len;
}
UVC_ATTR(uvcg_default_output_, b_source_id, bSourceID);
static struct configfs_attribute *uvcg_default_output_attrs[] = {
&uvcg_default_output_attr_b_terminal_id,
&uvcg_default_output_attr_w_terminal_type,
&uvcg_default_output_attr_b_assoc_terminal,
&uvcg_default_output_attr_b_source_id,
&uvcg_default_output_attr_i_terminal,
NULL,
};
static const struct uvcg_config_group_type uvcg_default_output_type = {
.type = {
.ct_item_ops = &uvcg_config_item_ops,
.ct_attrs = uvcg_default_output_attrs,
.ct_owner = THIS_MODULE,
},
.name = "default",
};
/* -----------------------------------------------------------------------------
* control/terminal/output
*/
static const struct uvcg_config_group_type uvcg_output_grp_type = {
.type = {
.ct_item_ops = &uvcg_config_item_ops,
.ct_owner = THIS_MODULE,
},
.name = "output",
.children = (const struct uvcg_config_group_type*[]) {
&uvcg_default_output_type,
NULL,
},
};
/* -----------------------------------------------------------------------------
* control/terminal
*/
static const struct uvcg_config_group_type uvcg_terminal_grp_type = {
.type = {
.ct_item_ops = &uvcg_config_item_ops,
.ct_owner = THIS_MODULE,
},
.name = "terminal",
.children = (const struct uvcg_config_group_type*[]) {
&uvcg_camera_grp_type,
&uvcg_output_grp_type,
NULL,
},
};
/* -----------------------------------------------------------------------------
* control/class/{fs|ss}
*/
struct uvcg_control_class_group {
struct config_group group;
const char *name;
};
static inline struct uvc_descriptor_header
**uvcg_get_ctl_class_arr(struct config_item *i, struct f_uvc_opts *o)
{
struct uvcg_control_class_group *group =
container_of(i, struct uvcg_control_class_group,
group.cg_item);
if (!strcmp(group->name, "fs"))
return o->uvc_fs_control_cls;
if (!strcmp(group->name, "ss"))
return o->uvc_ss_control_cls;
return NULL;
}
static int uvcg_control_class_allow_link(struct config_item *src,
struct config_item *target)
{
struct config_item *control, *header;
struct f_uvc_opts *opts;
struct mutex *su_mutex = &src->ci_group->cg_subsys->su_mutex;
struct uvc_descriptor_header **class_array;
struct uvcg_control_header *target_hdr;
int ret = -EINVAL;
mutex_lock(su_mutex); /* for navigating configfs hierarchy */
control = src->ci_parent->ci_parent;
header = config_group_find_item(to_config_group(control), "header");
if (!header || target->ci_parent != header)
goto out;
opts = to_f_uvc_opts(control->ci_parent);
mutex_lock(&opts->lock);
class_array = uvcg_get_ctl_class_arr(src, opts);
if (!class_array)
goto unlock;
if (opts->refcnt || class_array[0]) {
ret = -EBUSY;
goto unlock;
}
target_hdr = to_uvcg_control_header(target);
++target_hdr->linked;
class_array[0] = (struct uvc_descriptor_header *)&target_hdr->desc;
ret = 0;
unlock:
mutex_unlock(&opts->lock);
out:
config_item_put(header);
mutex_unlock(su_mutex);
return ret;
}
static void uvcg_control_class_drop_link(struct config_item *src,
struct config_item *target)
{
struct config_item *control, *header;
struct f_uvc_opts *opts;
struct mutex *su_mutex = &src->ci_group->cg_subsys->su_mutex;
struct uvc_descriptor_header **class_array;
struct uvcg_control_header *target_hdr;
mutex_lock(su_mutex); /* for navigating configfs hierarchy */
control = src->ci_parent->ci_parent;
header = config_group_find_item(to_config_group(control), "header");
if (!header || target->ci_parent != header)
goto out;
opts = to_f_uvc_opts(control->ci_parent);
mutex_lock(&opts->lock);
class_array = uvcg_get_ctl_class_arr(src, opts);
if (!class_array || opts->refcnt)
goto unlock;
target_hdr = to_uvcg_control_header(target);
--target_hdr->linked;
class_array[0] = NULL;
unlock:
mutex_unlock(&opts->lock);
out:
config_item_put(header);
mutex_unlock(su_mutex);
}
static struct configfs_item_operations uvcg_control_class_item_ops = {
.release = uvcg_config_item_release,
.allow_link = uvcg_control_class_allow_link,
.drop_link = uvcg_control_class_drop_link,
};
static const struct config_item_type uvcg_control_class_type = {
.ct_item_ops = &uvcg_control_class_item_ops,
.ct_owner = THIS_MODULE,
};
/* -----------------------------------------------------------------------------
* control/class
*/
static int uvcg_control_class_create_children(struct config_group *parent)
{
static const char * const names[] = { "fs", "ss" };
unsigned int i;
for (i = 0; i < ARRAY_SIZE(names); ++i) {
struct uvcg_control_class_group *group;
group = kzalloc(sizeof(*group), GFP_KERNEL);
if (!group)
return -ENOMEM;
group->name = names[i];
config_group_init_type_name(&group->group, group->name,
&uvcg_control_class_type);
configfs_add_default_group(&group->group, parent);
}
return 0;
}
static const struct uvcg_config_group_type uvcg_control_class_grp_type = {
.type = {
.ct_item_ops = &uvcg_config_item_ops,
.ct_owner = THIS_MODULE,
},
.name = "class",
.create_children = uvcg_control_class_create_children,
};
/* -----------------------------------------------------------------------------
* control
*/
static ssize_t uvcg_default_control_b_interface_number_show(
struct config_item *item, char *page)
{
struct config_group *group = to_config_group(item);
struct mutex *su_mutex = &group->cg_subsys->su_mutex;
struct config_item *opts_item;
struct f_uvc_opts *opts;
int result = 0;
mutex_lock(su_mutex); /* for navigating configfs hierarchy */
opts_item = item->ci_parent;
opts = to_f_uvc_opts(opts_item);
mutex_lock(&opts->lock);
result += sprintf(page, "%u\n", opts->control_interface);
mutex_unlock(&opts->lock);
mutex_unlock(su_mutex);
return result;
}
UVC_ATTR_RO(uvcg_default_control_, b_interface_number, bInterfaceNumber);
static struct configfs_attribute *uvcg_default_control_attrs[] = {
&uvcg_default_control_attr_b_interface_number,
NULL,
};
static const struct uvcg_config_group_type uvcg_control_grp_type = {
.type = {
.ct_item_ops = &uvcg_config_item_ops,
.ct_attrs = uvcg_default_control_attrs,
.ct_owner = THIS_MODULE,
},
.name = "control",
.children = (const struct uvcg_config_group_type*[]) {
&uvcg_control_header_grp_type,
&uvcg_processing_grp_type,
&uvcg_terminal_grp_type,
&uvcg_control_class_grp_type,
NULL,
},
};
/* -----------------------------------------------------------------------------
* streaming/uncompressed
* streaming/mjpeg
*/
static const char * const uvcg_format_names[] = {
"uncompressed",
"mjpeg",
};
enum uvcg_format_type {
UVCG_UNCOMPRESSED = 0,
UVCG_MJPEG,
};
struct uvcg_format {
struct config_group group;
enum uvcg_format_type type;
unsigned linked;
unsigned num_frames;
__u8 bmaControls[UVCG_STREAMING_CONTROL_SIZE];
};
static struct uvcg_format *to_uvcg_format(struct config_item *item)
{
return container_of(to_config_group(item), struct uvcg_format, group);
}
static ssize_t uvcg_format_bma_controls_show(struct uvcg_format *f, char *page)
{
struct f_uvc_opts *opts;
struct config_item *opts_item;
struct mutex *su_mutex = &f->group.cg_subsys->su_mutex;
int result, i;
char *pg = page;
mutex_lock(su_mutex); /* for navigating configfs hierarchy */
opts_item = f->group.cg_item.ci_parent->ci_parent->ci_parent;
opts = to_f_uvc_opts(opts_item);
mutex_lock(&opts->lock);
result = sprintf(pg, "0x");
pg += result;
for (i = 0; i < UVCG_STREAMING_CONTROL_SIZE; ++i) {
result += sprintf(pg, "%x\n", f->bmaControls[i]);
pg = page + result;
}
mutex_unlock(&opts->lock);
mutex_unlock(su_mutex);
return result;
}
static ssize_t uvcg_format_bma_controls_store(struct uvcg_format *ch,
const char *page, size_t len)
{
struct f_uvc_opts *opts;
struct config_item *opts_item;
struct mutex *su_mutex = &ch->group.cg_subsys->su_mutex;
int ret = -EINVAL;
mutex_lock(su_mutex); /* for navigating configfs hierarchy */
opts_item = ch->group.cg_item.ci_parent->ci_parent->ci_parent;
opts = to_f_uvc_opts(opts_item);
mutex_lock(&opts->lock);
if (ch->linked || opts->refcnt) {
ret = -EBUSY;
goto end;
}
if (len < 4 || *page != '0' ||
(*(page + 1) != 'x' && *(page + 1) != 'X'))
goto end;
ret = hex2bin(ch->bmaControls, page + 2, 1);
if (ret < 0)
goto end;
ret = len;
end:
mutex_unlock(&opts->lock);
mutex_unlock(su_mutex);
return ret;
}
struct uvcg_format_ptr {
struct uvcg_format *fmt;
struct list_head entry;
};
/* -----------------------------------------------------------------------------
* streaming/header/<NAME>
* streaming/header
*/
struct uvcg_streaming_header {
struct config_item item;
struct uvc_input_header_descriptor desc;
unsigned linked;
struct list_head formats;
unsigned num_fmt;
};
static struct uvcg_streaming_header *to_uvcg_streaming_header(struct config_item *item)
{
return container_of(item, struct uvcg_streaming_header, item);
}
static void uvcg_format_set_indices(struct config_group *fmt);
static int uvcg_streaming_header_allow_link(struct config_item *src,
struct config_item *target)
{
struct mutex *su_mutex = &src->ci_group->cg_subsys->su_mutex;
struct config_item *opts_item;
struct f_uvc_opts *opts;
struct uvcg_streaming_header *src_hdr;
struct uvcg_format *target_fmt = NULL;
struct uvcg_format_ptr *format_ptr;
int i, ret = -EINVAL;
src_hdr = to_uvcg_streaming_header(src);
mutex_lock(su_mutex); /* for navigating configfs hierarchy */
opts_item = src->ci_parent->ci_parent->ci_parent;
opts = to_f_uvc_opts(opts_item);
mutex_lock(&opts->lock);
if (src_hdr->linked) {
ret = -EBUSY;
goto out;
}
/*
* Linking is only allowed to direct children of the format nodes
* (streaming/uncompressed or streaming/mjpeg nodes). First check that
* the grand-parent of the target matches the grand-parent of the source
* (the streaming node), and then verify that the target parent is a
* format node.
*/
if (src->ci_parent->ci_parent != target->ci_parent->ci_parent)
goto out;
for (i = 0; i < ARRAY_SIZE(uvcg_format_names); ++i) {
if (!strcmp(target->ci_parent->ci_name, uvcg_format_names[i]))
break;
}
if (i == ARRAY_SIZE(uvcg_format_names))
goto out;
target_fmt = container_of(to_config_group(target), struct uvcg_format,
group);
uvcg_format_set_indices(to_config_group(target));
format_ptr = kzalloc(sizeof(*format_ptr), GFP_KERNEL);
if (!format_ptr) {
ret = -ENOMEM;
goto out;
}
ret = 0;
format_ptr->fmt = target_fmt;
list_add_tail(&format_ptr->entry, &src_hdr->formats);
++src_hdr->num_fmt;
++target_fmt->linked;
out:
mutex_unlock(&opts->lock);
mutex_unlock(su_mutex);
return ret;
}
static void uvcg_streaming_header_drop_link(struct config_item *src,
struct config_item *target)
{
struct mutex *su_mutex = &src->ci_group->cg_subsys->su_mutex;
struct config_item *opts_item;
struct f_uvc_opts *opts;
struct uvcg_streaming_header *src_hdr;
struct uvcg_format *target_fmt = NULL;
struct uvcg_format_ptr *format_ptr, *tmp;
src_hdr = to_uvcg_streaming_header(src);
mutex_lock(su_mutex); /* for navigating configfs hierarchy */
opts_item = src->ci_parent->ci_parent->ci_parent;
opts = to_f_uvc_opts(opts_item);
mutex_lock(&opts->lock);
target_fmt = container_of(to_config_group(target), struct uvcg_format,
group);
list_for_each_entry_safe(format_ptr, tmp, &src_hdr->formats, entry)
if (format_ptr->fmt == target_fmt) {
list_del(&format_ptr->entry);
kfree(format_ptr);
--src_hdr->num_fmt;
break;
}
--target_fmt->linked;
mutex_unlock(&opts->lock);
mutex_unlock(su_mutex);
}
static struct configfs_item_operations uvcg_streaming_header_item_ops = {
.release = uvcg_config_item_release,
.allow_link = uvcg_streaming_header_allow_link,
.drop_link = uvcg_streaming_header_drop_link,
};
#define UVCG_STREAMING_HEADER_ATTR(cname, aname, bits) \
static ssize_t uvcg_streaming_header_##cname##_show( \
struct config_item *item, char *page) \
{ \
struct uvcg_streaming_header *sh = to_uvcg_streaming_header(item); \
struct f_uvc_opts *opts; \
struct config_item *opts_item; \
struct mutex *su_mutex = &sh->item.ci_group->cg_subsys->su_mutex;\
int result; \
\
mutex_lock(su_mutex); /* for navigating configfs hierarchy */ \
\
opts_item = sh->item.ci_parent->ci_parent->ci_parent; \
opts = to_f_uvc_opts(opts_item); \
\
mutex_lock(&opts->lock); \
result = sprintf(page, "%u\n", le##bits##_to_cpu(sh->desc.aname));\
mutex_unlock(&opts->lock); \
\
mutex_unlock(su_mutex); \
return result; \
} \
\
UVC_ATTR_RO(uvcg_streaming_header_, cname, aname)
UVCG_STREAMING_HEADER_ATTR(bm_info, bmInfo, 8);
UVCG_STREAMING_HEADER_ATTR(b_terminal_link, bTerminalLink, 8);
UVCG_STREAMING_HEADER_ATTR(b_still_capture_method, bStillCaptureMethod, 8);
UVCG_STREAMING_HEADER_ATTR(b_trigger_support, bTriggerSupport, 8);
UVCG_STREAMING_HEADER_ATTR(b_trigger_usage, bTriggerUsage, 8);
#undef UVCG_STREAMING_HEADER_ATTR
static struct configfs_attribute *uvcg_streaming_header_attrs[] = {
&uvcg_streaming_header_attr_bm_info,
&uvcg_streaming_header_attr_b_terminal_link,
&uvcg_streaming_header_attr_b_still_capture_method,
&uvcg_streaming_header_attr_b_trigger_support,
&uvcg_streaming_header_attr_b_trigger_usage,
NULL,
};
static const struct config_item_type uvcg_streaming_header_type = {
.ct_item_ops = &uvcg_streaming_header_item_ops,
.ct_attrs = uvcg_streaming_header_attrs,
.ct_owner = THIS_MODULE,
};
static struct config_item
*uvcg_streaming_header_make(struct config_group *group, const char *name)
{
struct uvcg_streaming_header *h;
h = kzalloc(sizeof(*h), GFP_KERNEL);
if (!h)
return ERR_PTR(-ENOMEM);
INIT_LIST_HEAD(&h->formats);
h->desc.bDescriptorType = USB_DT_CS_INTERFACE;
h->desc.bDescriptorSubType = UVC_VS_INPUT_HEADER;
h->desc.bTerminalLink = 3;
h->desc.bControlSize = UVCG_STREAMING_CONTROL_SIZE;
config_item_init_type_name(&h->item, name, &uvcg_streaming_header_type);
return &h->item;
}
static struct configfs_group_operations uvcg_streaming_header_grp_ops = {
.make_item = uvcg_streaming_header_make,
};
static const struct uvcg_config_group_type uvcg_streaming_header_grp_type = {
.type = {
.ct_item_ops = &uvcg_config_item_ops,
.ct_group_ops = &uvcg_streaming_header_grp_ops,
.ct_owner = THIS_MODULE,
},
.name = "header",
};
/* -----------------------------------------------------------------------------
* streaming/<mode>/<format>/<NAME>
*/
struct uvcg_frame {
struct config_item item;
enum uvcg_format_type fmt_type;
struct {
u8 b_length;
u8 b_descriptor_type;
u8 b_descriptor_subtype;
u8 b_frame_index;
u8 bm_capabilities;
u16 w_width;
u16 w_height;
u32 dw_min_bit_rate;
u32 dw_max_bit_rate;
u32 dw_max_video_frame_buffer_size;
u32 dw_default_frame_interval;
u8 b_frame_interval_type;
} __attribute__((packed)) frame;
u32 *dw_frame_interval;
};
static struct uvcg_frame *to_uvcg_frame(struct config_item *item)
{
return container_of(item, struct uvcg_frame, item);
}
#define UVCG_FRAME_ATTR(cname, aname, bits) \
static ssize_t uvcg_frame_##cname##_show(struct config_item *item, char *page)\
{ \
struct uvcg_frame *f = to_uvcg_frame(item); \
struct f_uvc_opts *opts; \
struct config_item *opts_item; \
struct mutex *su_mutex = &f->item.ci_group->cg_subsys->su_mutex;\
int result; \
\
mutex_lock(su_mutex); /* for navigating configfs hierarchy */ \
\
opts_item = f->item.ci_parent->ci_parent->ci_parent->ci_parent; \
opts = to_f_uvc_opts(opts_item); \
\
mutex_lock(&opts->lock); \
result = sprintf(page, "%u\n", f->frame.cname); \
mutex_unlock(&opts->lock); \
\
mutex_unlock(su_mutex); \
return result; \
} \
\
static ssize_t uvcg_frame_##cname##_store(struct config_item *item, \
const char *page, size_t len)\
{ \
struct uvcg_frame *f = to_uvcg_frame(item); \
struct f_uvc_opts *opts; \
struct config_item *opts_item; \
struct uvcg_format *fmt; \
struct mutex *su_mutex = &f->item.ci_group->cg_subsys->su_mutex;\
typeof(f->frame.cname) num; \
int ret; \
\
ret = kstrtou##bits(page, 0, &num); \
if (ret) \
return ret; \
\
mutex_lock(su_mutex); /* for navigating configfs hierarchy */ \
\
opts_item = f->item.ci_parent->ci_parent->ci_parent->ci_parent; \
opts = to_f_uvc_opts(opts_item); \
fmt = to_uvcg_format(f->item.ci_parent); \
\
mutex_lock(&opts->lock); \
if (fmt->linked || opts->refcnt) { \
ret = -EBUSY; \
goto end; \
} \
\
f->frame.cname = num; \
ret = len; \
end: \
mutex_unlock(&opts->lock); \
mutex_unlock(su_mutex); \
return ret; \
} \
\
UVC_ATTR(uvcg_frame_, cname, aname);
static ssize_t uvcg_frame_b_frame_index_show(struct config_item *item,
char *page)
{
struct uvcg_frame *f = to_uvcg_frame(item);
struct uvcg_format *fmt;
struct f_uvc_opts *opts;
struct config_item *opts_item;
struct config_item *fmt_item;
struct mutex *su_mutex = &f->item.ci_group->cg_subsys->su_mutex;
int result;
mutex_lock(su_mutex); /* for navigating configfs hierarchy */
fmt_item = f->item.ci_parent;
fmt = to_uvcg_format(fmt_item);
if (!fmt->linked) {
result = -EBUSY;
goto out;
}
opts_item = fmt_item->ci_parent->ci_parent->ci_parent;
opts = to_f_uvc_opts(opts_item);
mutex_lock(&opts->lock);
result = sprintf(page, "%u\n", f->frame.b_frame_index);
mutex_unlock(&opts->lock);
out:
mutex_unlock(su_mutex);
return result;
}
UVC_ATTR_RO(uvcg_frame_, b_frame_index, bFrameIndex);
UVCG_FRAME_ATTR(bm_capabilities, bmCapabilities, 8);
UVCG_FRAME_ATTR(w_width, wWidth, 16);
UVCG_FRAME_ATTR(w_height, wHeight, 16);
UVCG_FRAME_ATTR(dw_min_bit_rate, dwMinBitRate, 32);
UVCG_FRAME_ATTR(dw_max_bit_rate, dwMaxBitRate, 32);
UVCG_FRAME_ATTR(dw_max_video_frame_buffer_size, dwMaxVideoFrameBufferSize, 32);
UVCG_FRAME_ATTR(dw_default_frame_interval, dwDefaultFrameInterval, 32);
#undef UVCG_FRAME_ATTR
static ssize_t uvcg_frame_dw_frame_interval_show(struct config_item *item,
char *page)
{
struct uvcg_frame *frm = to_uvcg_frame(item);
struct f_uvc_opts *opts;
struct config_item *opts_item;
struct mutex *su_mutex = &frm->item.ci_group->cg_subsys->su_mutex;
int result, i;
char *pg = page;
mutex_lock(su_mutex); /* for navigating configfs hierarchy */
opts_item = frm->item.ci_parent->ci_parent->ci_parent->ci_parent;
opts = to_f_uvc_opts(opts_item);
mutex_lock(&opts->lock);
for (result = 0, i = 0; i < frm->frame.b_frame_interval_type; ++i) {
result += sprintf(pg, "%u\n", frm->dw_frame_interval[i]);
pg = page + result;
}
mutex_unlock(&opts->lock);
mutex_unlock(su_mutex);
return result;
}
static inline int __uvcg_count_frm_intrv(char *buf, void *priv)
{
++*((int *)priv);
return 0;
}
static inline int __uvcg_fill_frm_intrv(char *buf, void *priv)
{
u32 num, **interv;
int ret;
ret = kstrtou32(buf, 0, &num);
if (ret)
return ret;
interv = priv;
**interv = num;
++*interv;
return 0;
}
static int __uvcg_iter_frm_intrv(const char *page, size_t len,
int (*fun)(char *, void *), void *priv)
{
/* sign, base 2 representation, newline, terminator */
char buf[1 + sizeof(u32) * 8 + 1 + 1];
const char *pg = page;
int i, ret;
if (!fun)
return -EINVAL;
while (pg - page < len) {
i = 0;
while (i < sizeof(buf) && (pg - page < len) &&
*pg != '\0' && *pg != '\n')
buf[i++] = *pg++;
if (i == sizeof(buf))
return -EINVAL;
while ((pg - page < len) && (*pg == '\0' || *pg == '\n'))
++pg;
buf[i] = '\0';
ret = fun(buf, priv);
if (ret)
return ret;
}
return 0;
}
static ssize_t uvcg_frame_dw_frame_interval_store(struct config_item *item,
const char *page, size_t len)
{
struct uvcg_frame *ch = to_uvcg_frame(item);
struct f_uvc_opts *opts;
struct config_item *opts_item;
struct uvcg_format *fmt;
struct mutex *su_mutex = &ch->item.ci_group->cg_subsys->su_mutex;
int ret = 0, n = 0;
u32 *frm_intrv, *tmp;
mutex_lock(su_mutex); /* for navigating configfs hierarchy */
opts_item = ch->item.ci_parent->ci_parent->ci_parent->ci_parent;
opts = to_f_uvc_opts(opts_item);
fmt = to_uvcg_format(ch->item.ci_parent);
mutex_lock(&opts->lock);
if (fmt->linked || opts->refcnt) {
ret = -EBUSY;
goto end;
}
ret = __uvcg_iter_frm_intrv(page, len, __uvcg_count_frm_intrv, &n);
if (ret)
goto end;
tmp = frm_intrv = kcalloc(n, sizeof(u32), GFP_KERNEL);
if (!frm_intrv) {
ret = -ENOMEM;
goto end;
}
ret = __uvcg_iter_frm_intrv(page, len, __uvcg_fill_frm_intrv, &tmp);
if (ret) {
kfree(frm_intrv);
goto end;
}
kfree(ch->dw_frame_interval);
ch->dw_frame_interval = frm_intrv;
ch->frame.b_frame_interval_type = n;
sort(ch->dw_frame_interval, n, sizeof(*ch->dw_frame_interval),
uvcg_config_compare_u32, NULL);
ret = len;
end:
mutex_unlock(&opts->lock);
mutex_unlock(su_mutex);
return ret;
}
UVC_ATTR(uvcg_frame_, dw_frame_interval, dwFrameInterval);
static struct configfs_attribute *uvcg_frame_attrs[] = {
&uvcg_frame_attr_b_frame_index,
&uvcg_frame_attr_bm_capabilities,
&uvcg_frame_attr_w_width,
&uvcg_frame_attr_w_height,
&uvcg_frame_attr_dw_min_bit_rate,
&uvcg_frame_attr_dw_max_bit_rate,
&uvcg_frame_attr_dw_max_video_frame_buffer_size,
&uvcg_frame_attr_dw_default_frame_interval,
&uvcg_frame_attr_dw_frame_interval,
NULL,
};
static const struct config_item_type uvcg_frame_type = {
.ct_item_ops = &uvcg_config_item_ops,
.ct_attrs = uvcg_frame_attrs,
.ct_owner = THIS_MODULE,
};
static struct config_item *uvcg_frame_make(struct config_group *group,
const char *name)
{
struct uvcg_frame *h;
struct uvcg_format *fmt;
struct f_uvc_opts *opts;
struct config_item *opts_item;
h = kzalloc(sizeof(*h), GFP_KERNEL);
if (!h)
return ERR_PTR(-ENOMEM);
h->frame.b_descriptor_type = USB_DT_CS_INTERFACE;
h->frame.b_frame_index = 1;
h->frame.w_width = 640;
h->frame.w_height = 360;
h->frame.dw_min_bit_rate = 18432000;
h->frame.dw_max_bit_rate = 55296000;
h->frame.dw_max_video_frame_buffer_size = 460800;
h->frame.dw_default_frame_interval = 666666;
opts_item = group->cg_item.ci_parent->ci_parent->ci_parent;
opts = to_f_uvc_opts(opts_item);
mutex_lock(&opts->lock);
fmt = to_uvcg_format(&group->cg_item);
if (fmt->type == UVCG_UNCOMPRESSED) {
h->frame.b_descriptor_subtype = UVC_VS_FRAME_UNCOMPRESSED;
h->fmt_type = UVCG_UNCOMPRESSED;
} else if (fmt->type == UVCG_MJPEG) {
h->frame.b_descriptor_subtype = UVC_VS_FRAME_MJPEG;
h->fmt_type = UVCG_MJPEG;
} else {
mutex_unlock(&opts->lock);
kfree(h);
return ERR_PTR(-EINVAL);
}
++fmt->num_frames;
mutex_unlock(&opts->lock);
config_item_init_type_name(&h->item, name, &uvcg_frame_type);
return &h->item;
}
static void uvcg_frame_drop(struct config_group *group, struct config_item *item)
{
struct uvcg_format *fmt;
struct f_uvc_opts *opts;
struct config_item *opts_item;
opts_item = group->cg_item.ci_parent->ci_parent->ci_parent;
opts = to_f_uvc_opts(opts_item);
mutex_lock(&opts->lock);
fmt = to_uvcg_format(&group->cg_item);
--fmt->num_frames;
mutex_unlock(&opts->lock);
config_item_put(item);
}
static void uvcg_format_set_indices(struct config_group *fmt)
{
struct config_item *ci;
unsigned int i = 1;
list_for_each_entry(ci, &fmt->cg_children, ci_entry) {
struct uvcg_frame *frm;
if (ci->ci_type != &uvcg_frame_type)
continue;
frm = to_uvcg_frame(ci);
frm->frame.b_frame_index = i++;
}
}
/* -----------------------------------------------------------------------------
* streaming/uncompressed/<NAME>
*/
struct uvcg_uncompressed {
struct uvcg_format fmt;
struct uvc_format_uncompressed desc;
};
static struct uvcg_uncompressed *to_uvcg_uncompressed(struct config_item *item)
{
return container_of(
container_of(to_config_group(item), struct uvcg_format, group),
struct uvcg_uncompressed, fmt);
}
static struct configfs_group_operations uvcg_uncompressed_group_ops = {
.make_item = uvcg_frame_make,
.drop_item = uvcg_frame_drop,
};
static ssize_t uvcg_uncompressed_guid_format_show(struct config_item *item,
char *page)
{
struct uvcg_uncompressed *ch = to_uvcg_uncompressed(item);
struct f_uvc_opts *opts;
struct config_item *opts_item;
struct mutex *su_mutex = &ch->fmt.group.cg_subsys->su_mutex;
mutex_lock(su_mutex); /* for navigating configfs hierarchy */
opts_item = ch->fmt.group.cg_item.ci_parent->ci_parent->ci_parent;
opts = to_f_uvc_opts(opts_item);
mutex_lock(&opts->lock);
memcpy(page, ch->desc.guidFormat, sizeof(ch->desc.guidFormat));
mutex_unlock(&opts->lock);
mutex_unlock(su_mutex);
return sizeof(ch->desc.guidFormat);
}
static ssize_t uvcg_uncompressed_guid_format_store(struct config_item *item,
const char *page, size_t len)
{
struct uvcg_uncompressed *ch = to_uvcg_uncompressed(item);
struct f_uvc_opts *opts;
struct config_item *opts_item;
struct mutex *su_mutex = &ch->fmt.group.cg_subsys->su_mutex;
int ret;
mutex_lock(su_mutex); /* for navigating configfs hierarchy */
opts_item = ch->fmt.group.cg_item.ci_parent->ci_parent->ci_parent;
opts = to_f_uvc_opts(opts_item);
mutex_lock(&opts->lock);
if (ch->fmt.linked || opts->refcnt) {
ret = -EBUSY;
goto end;
}
memcpy(ch->desc.guidFormat, page,
min(sizeof(ch->desc.guidFormat), len));
ret = sizeof(ch->desc.guidFormat);
end:
mutex_unlock(&opts->lock);
mutex_unlock(su_mutex);
return ret;
}
UVC_ATTR(uvcg_uncompressed_, guid_format, guidFormat);
#define UVCG_UNCOMPRESSED_ATTR_RO(cname, aname, bits) \
static ssize_t uvcg_uncompressed_##cname##_show( \
struct config_item *item, char *page) \
{ \
struct uvcg_uncompressed *u = to_uvcg_uncompressed(item); \
struct f_uvc_opts *opts; \
struct config_item *opts_item; \
struct mutex *su_mutex = &u->fmt.group.cg_subsys->su_mutex; \
int result; \
\
mutex_lock(su_mutex); /* for navigating configfs hierarchy */ \
\
opts_item = u->fmt.group.cg_item.ci_parent->ci_parent->ci_parent;\
opts = to_f_uvc_opts(opts_item); \
\
mutex_lock(&opts->lock); \
result = sprintf(page, "%u\n", le##bits##_to_cpu(u->desc.aname));\
mutex_unlock(&opts->lock); \
\
mutex_unlock(su_mutex); \
return result; \
} \
\
UVC_ATTR_RO(uvcg_uncompressed_, cname, aname);
#define UVCG_UNCOMPRESSED_ATTR(cname, aname, bits) \
static ssize_t uvcg_uncompressed_##cname##_show( \
struct config_item *item, char *page) \
{ \
struct uvcg_uncompressed *u = to_uvcg_uncompressed(item); \
struct f_uvc_opts *opts; \
struct config_item *opts_item; \
struct mutex *su_mutex = &u->fmt.group.cg_subsys->su_mutex; \
int result; \
\
mutex_lock(su_mutex); /* for navigating configfs hierarchy */ \
\
opts_item = u->fmt.group.cg_item.ci_parent->ci_parent->ci_parent;\
opts = to_f_uvc_opts(opts_item); \
\
mutex_lock(&opts->lock); \
result = sprintf(page, "%u\n", le##bits##_to_cpu(u->desc.aname));\
mutex_unlock(&opts->lock); \
\
mutex_unlock(su_mutex); \
return result; \
} \
\
static ssize_t \
uvcg_uncompressed_##cname##_store(struct config_item *item, \
const char *page, size_t len) \
{ \
struct uvcg_uncompressed *u = to_uvcg_uncompressed(item); \
struct f_uvc_opts *opts; \
struct config_item *opts_item; \
struct mutex *su_mutex = &u->fmt.group.cg_subsys->su_mutex; \
int ret; \
u8 num; \
\
mutex_lock(su_mutex); /* for navigating configfs hierarchy */ \
\
opts_item = u->fmt.group.cg_item.ci_parent->ci_parent->ci_parent;\
opts = to_f_uvc_opts(opts_item); \
\
mutex_lock(&opts->lock); \
if (u->fmt.linked || opts->refcnt) { \
ret = -EBUSY; \
goto end; \
} \
\
ret = kstrtou8(page, 0, &num); \
if (ret) \
goto end; \
\
u->desc.aname = num; \
ret = len; \
end: \
mutex_unlock(&opts->lock); \
mutex_unlock(su_mutex); \
return ret; \
} \
\
UVC_ATTR(uvcg_uncompressed_, cname, aname);
UVCG_UNCOMPRESSED_ATTR_RO(b_format_index, bFormatIndex, 8);
UVCG_UNCOMPRESSED_ATTR(b_bits_per_pixel, bBitsPerPixel, 8);
UVCG_UNCOMPRESSED_ATTR(b_default_frame_index, bDefaultFrameIndex, 8);
UVCG_UNCOMPRESSED_ATTR_RO(b_aspect_ratio_x, bAspectRatioX, 8);
UVCG_UNCOMPRESSED_ATTR_RO(b_aspect_ratio_y, bAspectRatioY, 8);
UVCG_UNCOMPRESSED_ATTR_RO(bm_interface_flags, bmInterfaceFlags, 8);
#undef UVCG_UNCOMPRESSED_ATTR
#undef UVCG_UNCOMPRESSED_ATTR_RO
static inline ssize_t
uvcg_uncompressed_bma_controls_show(struct config_item *item, char *page)
{
struct uvcg_uncompressed *unc = to_uvcg_uncompressed(item);
return uvcg_format_bma_controls_show(&unc->fmt, page);
}
static inline ssize_t
uvcg_uncompressed_bma_controls_store(struct config_item *item,
const char *page, size_t len)
{
struct uvcg_uncompressed *unc = to_uvcg_uncompressed(item);
return uvcg_format_bma_controls_store(&unc->fmt, page, len);
}
UVC_ATTR(uvcg_uncompressed_, bma_controls, bmaControls);
static struct configfs_attribute *uvcg_uncompressed_attrs[] = {
&uvcg_uncompressed_attr_b_format_index,
&uvcg_uncompressed_attr_guid_format,
&uvcg_uncompressed_attr_b_bits_per_pixel,
&uvcg_uncompressed_attr_b_default_frame_index,
&uvcg_uncompressed_attr_b_aspect_ratio_x,
&uvcg_uncompressed_attr_b_aspect_ratio_y,
&uvcg_uncompressed_attr_bm_interface_flags,
&uvcg_uncompressed_attr_bma_controls,
NULL,
};
static const struct config_item_type uvcg_uncompressed_type = {
.ct_item_ops = &uvcg_config_item_ops,
.ct_group_ops = &uvcg_uncompressed_group_ops,
.ct_attrs = uvcg_uncompressed_attrs,
.ct_owner = THIS_MODULE,
};
static struct config_group *uvcg_uncompressed_make(struct config_group *group,
const char *name)
{
static char guid[] = {
'Y', 'U', 'Y', '2', 0x00, 0x00, 0x10, 0x00,
0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71
};
struct uvcg_uncompressed *h;
h = kzalloc(sizeof(*h), GFP_KERNEL);
if (!h)
return ERR_PTR(-ENOMEM);
h->desc.bLength = UVC_DT_FORMAT_UNCOMPRESSED_SIZE;
h->desc.bDescriptorType = USB_DT_CS_INTERFACE;
h->desc.bDescriptorSubType = UVC_VS_FORMAT_UNCOMPRESSED;
memcpy(h->desc.guidFormat, guid, sizeof(guid));
h->desc.bBitsPerPixel = 16;
h->desc.bDefaultFrameIndex = 1;
h->desc.bAspectRatioX = 0;
h->desc.bAspectRatioY = 0;
h->desc.bmInterfaceFlags = 0;
h->desc.bCopyProtect = 0;
h->fmt.type = UVCG_UNCOMPRESSED;
config_group_init_type_name(&h->fmt.group, name,
&uvcg_uncompressed_type);
return &h->fmt.group;
}
static struct configfs_group_operations uvcg_uncompressed_grp_ops = {
.make_group = uvcg_uncompressed_make,
};
static const struct uvcg_config_group_type uvcg_uncompressed_grp_type = {
.type = {
.ct_item_ops = &uvcg_config_item_ops,
.ct_group_ops = &uvcg_uncompressed_grp_ops,
.ct_owner = THIS_MODULE,
},
.name = "uncompressed",
};
/* -----------------------------------------------------------------------------
* streaming/mjpeg/<NAME>
*/
struct uvcg_mjpeg {
struct uvcg_format fmt;
struct uvc_format_mjpeg desc;
};
static struct uvcg_mjpeg *to_uvcg_mjpeg(struct config_item *item)
{
return container_of(
container_of(to_config_group(item), struct uvcg_format, group),
struct uvcg_mjpeg, fmt);
}
static struct configfs_group_operations uvcg_mjpeg_group_ops = {
.make_item = uvcg_frame_make,
.drop_item = uvcg_frame_drop,
};
#define UVCG_MJPEG_ATTR_RO(cname, aname, bits) \
static ssize_t uvcg_mjpeg_##cname##_show(struct config_item *item, char *page)\
{ \
struct uvcg_mjpeg *u = to_uvcg_mjpeg(item); \
struct f_uvc_opts *opts; \
struct config_item *opts_item; \
struct mutex *su_mutex = &u->fmt.group.cg_subsys->su_mutex; \
int result; \
\
mutex_lock(su_mutex); /* for navigating configfs hierarchy */ \
\
opts_item = u->fmt.group.cg_item.ci_parent->ci_parent->ci_parent;\
opts = to_f_uvc_opts(opts_item); \
\
mutex_lock(&opts->lock); \
result = sprintf(page, "%u\n", le##bits##_to_cpu(u->desc.aname));\
mutex_unlock(&opts->lock); \
\
mutex_unlock(su_mutex); \
return result; \
} \
\
UVC_ATTR_RO(uvcg_mjpeg_, cname, aname)
#define UVCG_MJPEG_ATTR(cname, aname, bits) \
static ssize_t uvcg_mjpeg_##cname##_show(struct config_item *item, char *page)\
{ \
struct uvcg_mjpeg *u = to_uvcg_mjpeg(item); \
struct f_uvc_opts *opts; \
struct config_item *opts_item; \
struct mutex *su_mutex = &u->fmt.group.cg_subsys->su_mutex; \
int result; \
\
mutex_lock(su_mutex); /* for navigating configfs hierarchy */ \
\
opts_item = u->fmt.group.cg_item.ci_parent->ci_parent->ci_parent;\
opts = to_f_uvc_opts(opts_item); \
\
mutex_lock(&opts->lock); \
result = sprintf(page, "%u\n", le##bits##_to_cpu(u->desc.aname));\
mutex_unlock(&opts->lock); \
\
mutex_unlock(su_mutex); \
return result; \
} \
\
static ssize_t \
uvcg_mjpeg_##cname##_store(struct config_item *item, \
const char *page, size_t len) \
{ \
struct uvcg_mjpeg *u = to_uvcg_mjpeg(item); \
struct f_uvc_opts *opts; \
struct config_item *opts_item; \
struct mutex *su_mutex = &u->fmt.group.cg_subsys->su_mutex; \
int ret; \
u8 num; \
\
mutex_lock(su_mutex); /* for navigating configfs hierarchy */ \
\
opts_item = u->fmt.group.cg_item.ci_parent->ci_parent->ci_parent;\
opts = to_f_uvc_opts(opts_item); \
\
mutex_lock(&opts->lock); \
if (u->fmt.linked || opts->refcnt) { \
ret = -EBUSY; \
goto end; \
} \
\
ret = kstrtou8(page, 0, &num); \
if (ret) \
goto end; \
\
u->desc.aname = num; \
ret = len; \
end: \
mutex_unlock(&opts->lock); \
mutex_unlock(su_mutex); \
return ret; \
} \
\
UVC_ATTR(uvcg_mjpeg_, cname, aname)
UVCG_MJPEG_ATTR_RO(b_format_index, bFormatIndex, 8);
UVCG_MJPEG_ATTR(b_default_frame_index, bDefaultFrameIndex, 8);
UVCG_MJPEG_ATTR_RO(bm_flags, bmFlags, 8);
UVCG_MJPEG_ATTR_RO(b_aspect_ratio_x, bAspectRatioX, 8);
UVCG_MJPEG_ATTR_RO(b_aspect_ratio_y, bAspectRatioY, 8);
UVCG_MJPEG_ATTR_RO(bm_interface_flags, bmInterfaceFlags, 8);
#undef UVCG_MJPEG_ATTR
#undef UVCG_MJPEG_ATTR_RO
static inline ssize_t
uvcg_mjpeg_bma_controls_show(struct config_item *item, char *page)
{
struct uvcg_mjpeg *u = to_uvcg_mjpeg(item);
return uvcg_format_bma_controls_show(&u->fmt, page);
}
static inline ssize_t
uvcg_mjpeg_bma_controls_store(struct config_item *item,
const char *page, size_t len)
{
struct uvcg_mjpeg *u = to_uvcg_mjpeg(item);
return uvcg_format_bma_controls_store(&u->fmt, page, len);
}
UVC_ATTR(uvcg_mjpeg_, bma_controls, bmaControls);
static struct configfs_attribute *uvcg_mjpeg_attrs[] = {
&uvcg_mjpeg_attr_b_format_index,
&uvcg_mjpeg_attr_b_default_frame_index,
&uvcg_mjpeg_attr_bm_flags,
&uvcg_mjpeg_attr_b_aspect_ratio_x,
&uvcg_mjpeg_attr_b_aspect_ratio_y,
&uvcg_mjpeg_attr_bm_interface_flags,
&uvcg_mjpeg_attr_bma_controls,
NULL,
};
static const struct config_item_type uvcg_mjpeg_type = {
.ct_item_ops = &uvcg_config_item_ops,
.ct_group_ops = &uvcg_mjpeg_group_ops,
.ct_attrs = uvcg_mjpeg_attrs,
.ct_owner = THIS_MODULE,
};
static struct config_group *uvcg_mjpeg_make(struct config_group *group,
const char *name)
{
struct uvcg_mjpeg *h;
h = kzalloc(sizeof(*h), GFP_KERNEL);
if (!h)
return ERR_PTR(-ENOMEM);
h->desc.bLength = UVC_DT_FORMAT_MJPEG_SIZE;
h->desc.bDescriptorType = USB_DT_CS_INTERFACE;
h->desc.bDescriptorSubType = UVC_VS_FORMAT_MJPEG;
h->desc.bDefaultFrameIndex = 1;
h->desc.bAspectRatioX = 0;
h->desc.bAspectRatioY = 0;
h->desc.bmInterfaceFlags = 0;
h->desc.bCopyProtect = 0;
h->fmt.type = UVCG_MJPEG;
config_group_init_type_name(&h->fmt.group, name,
&uvcg_mjpeg_type);
return &h->fmt.group;
}
static struct configfs_group_operations uvcg_mjpeg_grp_ops = {
.make_group = uvcg_mjpeg_make,
};
static const struct uvcg_config_group_type uvcg_mjpeg_grp_type = {
.type = {
.ct_item_ops = &uvcg_config_item_ops,
.ct_group_ops = &uvcg_mjpeg_grp_ops,
.ct_owner = THIS_MODULE,
},
.name = "mjpeg",
};
/* -----------------------------------------------------------------------------
* streaming/color_matching/default
*/
#define UVCG_DEFAULT_COLOR_MATCHING_ATTR(cname, aname, bits) \
static ssize_t uvcg_default_color_matching_##cname##_show( \
struct config_item *item, char *page) \
{ \
struct config_group *group = to_config_group(item); \
struct f_uvc_opts *opts; \
struct config_item *opts_item; \
struct mutex *su_mutex = &group->cg_subsys->su_mutex; \
struct uvc_color_matching_descriptor *cd; \
int result; \
\
mutex_lock(su_mutex); /* for navigating configfs hierarchy */ \
\
opts_item = group->cg_item.ci_parent->ci_parent->ci_parent; \
opts = to_f_uvc_opts(opts_item); \
cd = &opts->uvc_color_matching; \
\
mutex_lock(&opts->lock); \
result = sprintf(page, "%u\n", le##bits##_to_cpu(cd->aname)); \
mutex_unlock(&opts->lock); \
\
mutex_unlock(su_mutex); \
return result; \
} \
\
UVC_ATTR_RO(uvcg_default_color_matching_, cname, aname)
UVCG_DEFAULT_COLOR_MATCHING_ATTR(b_color_primaries, bColorPrimaries, 8);
UVCG_DEFAULT_COLOR_MATCHING_ATTR(b_transfer_characteristics,
bTransferCharacteristics, 8);
UVCG_DEFAULT_COLOR_MATCHING_ATTR(b_matrix_coefficients, bMatrixCoefficients, 8);
#undef UVCG_DEFAULT_COLOR_MATCHING_ATTR
static struct configfs_attribute *uvcg_default_color_matching_attrs[] = {
&uvcg_default_color_matching_attr_b_color_primaries,
&uvcg_default_color_matching_attr_b_transfer_characteristics,
&uvcg_default_color_matching_attr_b_matrix_coefficients,
NULL,
};
static const struct uvcg_config_group_type uvcg_default_color_matching_type = {
.type = {
.ct_item_ops = &uvcg_config_item_ops,
.ct_attrs = uvcg_default_color_matching_attrs,
.ct_owner = THIS_MODULE,
},
.name = "default",
};
/* -----------------------------------------------------------------------------
* streaming/color_matching
*/
static const struct uvcg_config_group_type uvcg_color_matching_grp_type = {
.type = {
.ct_item_ops = &uvcg_config_item_ops,
.ct_owner = THIS_MODULE,
},
.name = "color_matching",
.children = (const struct uvcg_config_group_type*[]) {
&uvcg_default_color_matching_type,
NULL,
},
};
/* -----------------------------------------------------------------------------
* streaming/class/{fs|hs|ss}
*/
struct uvcg_streaming_class_group {
struct config_group group;
const char *name;
};
static inline struct uvc_descriptor_header
***__uvcg_get_stream_class_arr(struct config_item *i, struct f_uvc_opts *o)
{
struct uvcg_streaming_class_group *group =
container_of(i, struct uvcg_streaming_class_group,
group.cg_item);
if (!strcmp(group->name, "fs"))
return &o->uvc_fs_streaming_cls;
if (!strcmp(group->name, "hs"))
return &o->uvc_hs_streaming_cls;
if (!strcmp(group->name, "ss"))
return &o->uvc_ss_streaming_cls;
return NULL;
}
enum uvcg_strm_type {
UVCG_HEADER = 0,
UVCG_FORMAT,
UVCG_FRAME
};
/*
* Iterate over a hierarchy of streaming descriptors' config items.
* The items are created by the user with configfs.
*
* It "processes" the header pointed to by @priv1, then for each format
* that follows the header "processes" the format itself and then for
* each frame inside a format "processes" the frame.
*
* As a "processing" function the @fun is used.
*
* __uvcg_iter_strm_cls() is used in two context: first, to calculate
* the amount of memory needed for an array of streaming descriptors
* and second, to actually fill the array.
*
* @h: streaming header pointer
* @priv2: an "inout" parameter (the caller might want to see the changes to it)
* @priv3: an "inout" parameter (the caller might want to see the changes to it)
* @fun: callback function for processing each level of the hierarchy
*/
static int __uvcg_iter_strm_cls(struct uvcg_streaming_header *h,
void *priv2, void *priv3,
int (*fun)(void *, void *, void *, int, enum uvcg_strm_type type))
{
struct uvcg_format_ptr *f;
struct config_group *grp;
struct config_item *item;
struct uvcg_frame *frm;
int ret, i, j;
if (!fun)
return -EINVAL;
i = j = 0;
ret = fun(h, priv2, priv3, 0, UVCG_HEADER);
if (ret)
return ret;
list_for_each_entry(f, &h->formats, entry) {
ret = fun(f->fmt, priv2, priv3, i++, UVCG_FORMAT);
if (ret)
return ret;
grp = &f->fmt->group;
list_for_each_entry(item, &grp->cg_children, ci_entry) {
frm = to_uvcg_frame(item);
ret = fun(frm, priv2, priv3, j++, UVCG_FRAME);
if (ret)
return ret;
}
}
return ret;
}
/*
* Count how many bytes are needed for an array of streaming descriptors.
*
* @priv1: pointer to a header, format or frame
* @priv2: inout parameter, accumulated size of the array
* @priv3: inout parameter, accumulated number of the array elements
* @n: unused, this function's prototype must match @fun in __uvcg_iter_strm_cls
*/
static int __uvcg_cnt_strm(void *priv1, void *priv2, void *priv3, int n,
enum uvcg_strm_type type)
{
size_t *size = priv2;
size_t *count = priv3;
switch (type) {
case UVCG_HEADER: {
struct uvcg_streaming_header *h = priv1;
*size += sizeof(h->desc);
/* bmaControls */
*size += h->num_fmt * UVCG_STREAMING_CONTROL_SIZE;
}
break;
case UVCG_FORMAT: {
struct uvcg_format *fmt = priv1;
if (fmt->type == UVCG_UNCOMPRESSED) {
struct uvcg_uncompressed *u =
container_of(fmt, struct uvcg_uncompressed,
fmt);
*size += sizeof(u->desc);
} else if (fmt->type == UVCG_MJPEG) {
struct uvcg_mjpeg *m =
container_of(fmt, struct uvcg_mjpeg, fmt);
*size += sizeof(m->desc);
} else {
return -EINVAL;
}
}
break;
case UVCG_FRAME: {
struct uvcg_frame *frm = priv1;
int sz = sizeof(frm->dw_frame_interval);
*size += sizeof(frm->frame);
*size += frm->frame.b_frame_interval_type * sz;
}
break;
}
++*count;
return 0;
}
/*
* Fill an array of streaming descriptors.
*
* @priv1: pointer to a header, format or frame
* @priv2: inout parameter, pointer into a block of memory
* @priv3: inout parameter, pointer to a 2-dimensional array
*/
static int __uvcg_fill_strm(void *priv1, void *priv2, void *priv3, int n,
enum uvcg_strm_type type)
{
void **dest = priv2;
struct uvc_descriptor_header ***array = priv3;
size_t sz;
**array = *dest;
++*array;
switch (type) {
case UVCG_HEADER: {
struct uvc_input_header_descriptor *ihdr = *dest;
struct uvcg_streaming_header *h = priv1;
struct uvcg_format_ptr *f;
memcpy(*dest, &h->desc, sizeof(h->desc));
*dest += sizeof(h->desc);
sz = UVCG_STREAMING_CONTROL_SIZE;
list_for_each_entry(f, &h->formats, entry) {
memcpy(*dest, f->fmt->bmaControls, sz);
*dest += sz;
}
ihdr->bLength = sizeof(h->desc) + h->num_fmt * sz;
ihdr->bNumFormats = h->num_fmt;
}
break;
case UVCG_FORMAT: {
struct uvcg_format *fmt = priv1;
if (fmt->type == UVCG_UNCOMPRESSED) {
struct uvcg_uncompressed *u =
container_of(fmt, struct uvcg_uncompressed,
fmt);
u->desc.bFormatIndex = n + 1;
u->desc.bNumFrameDescriptors = fmt->num_frames;
memcpy(*dest, &u->desc, sizeof(u->desc));
*dest += sizeof(u->desc);
} else if (fmt->type == UVCG_MJPEG) {
struct uvcg_mjpeg *m =
container_of(fmt, struct uvcg_mjpeg, fmt);
m->desc.bFormatIndex = n + 1;
m->desc.bNumFrameDescriptors = fmt->num_frames;
memcpy(*dest, &m->desc, sizeof(m->desc));
*dest += sizeof(m->desc);
} else {
return -EINVAL;
}
}
break;
case UVCG_FRAME: {
struct uvcg_frame *frm = priv1;
struct uvc_descriptor_header *h = *dest;
sz = sizeof(frm->frame);
memcpy(*dest, &frm->frame, sz);
*dest += sz;
sz = frm->frame.b_frame_interval_type *
sizeof(*frm->dw_frame_interval);
memcpy(*dest, frm->dw_frame_interval, sz);
*dest += sz;
if (frm->fmt_type == UVCG_UNCOMPRESSED)
h->bLength = UVC_DT_FRAME_UNCOMPRESSED_SIZE(
frm->frame.b_frame_interval_type);
else if (frm->fmt_type == UVCG_MJPEG)
h->bLength = UVC_DT_FRAME_MJPEG_SIZE(
frm->frame.b_frame_interval_type);
}
break;
}
return 0;
}
static int uvcg_streaming_class_allow_link(struct config_item *src,
struct config_item *target)
{
struct config_item *streaming, *header;
struct f_uvc_opts *opts;
struct mutex *su_mutex = &src->ci_group->cg_subsys->su_mutex;
struct uvc_descriptor_header ***class_array, **cl_arr;
struct uvcg_streaming_header *target_hdr;
void *data, *data_save;
size_t size = 0, count = 0;
int ret = -EINVAL;
mutex_lock(su_mutex); /* for navigating configfs hierarchy */
streaming = src->ci_parent->ci_parent;
header = config_group_find_item(to_config_group(streaming), "header");
if (!header || target->ci_parent != header)
goto out;
opts = to_f_uvc_opts(streaming->ci_parent);
mutex_lock(&opts->lock);
class_array = __uvcg_get_stream_class_arr(src, opts);
if (!class_array || *class_array || opts->refcnt) {
ret = -EBUSY;
goto unlock;
}
target_hdr = to_uvcg_streaming_header(target);
ret = __uvcg_iter_strm_cls(target_hdr, &size, &count, __uvcg_cnt_strm);
if (ret)
goto unlock;
count += 2; /* color_matching, NULL */
*class_array = kcalloc(count, sizeof(void *), GFP_KERNEL);
if (!*class_array) {
ret = -ENOMEM;
goto unlock;
}
data = data_save = kzalloc(size, GFP_KERNEL);
if (!data) {
kfree(*class_array);
*class_array = NULL;
ret = -ENOMEM;
goto unlock;
}
cl_arr = *class_array;
ret = __uvcg_iter_strm_cls(target_hdr, &data, &cl_arr,
__uvcg_fill_strm);
if (ret) {
kfree(*class_array);
*class_array = NULL;
/*
* __uvcg_fill_strm() called from __uvcg_iter_stream_cls()
* might have advanced the "data", so use a backup copy
*/
kfree(data_save);
goto unlock;
}
*cl_arr = (struct uvc_descriptor_header *)&opts->uvc_color_matching;
++target_hdr->linked;
ret = 0;
unlock:
mutex_unlock(&opts->lock);
out:
config_item_put(header);
mutex_unlock(su_mutex);
return ret;
}
static void uvcg_streaming_class_drop_link(struct config_item *src,
struct config_item *target)
{
struct config_item *streaming, *header;
struct f_uvc_opts *opts;
struct mutex *su_mutex = &src->ci_group->cg_subsys->su_mutex;
struct uvc_descriptor_header ***class_array;
struct uvcg_streaming_header *target_hdr;
mutex_lock(su_mutex); /* for navigating configfs hierarchy */
streaming = src->ci_parent->ci_parent;
header = config_group_find_item(to_config_group(streaming), "header");
if (!header || target->ci_parent != header)
goto out;
opts = to_f_uvc_opts(streaming->ci_parent);
mutex_lock(&opts->lock);
class_array = __uvcg_get_stream_class_arr(src, opts);
if (!class_array || !*class_array)
goto unlock;
if (opts->refcnt)
goto unlock;
target_hdr = to_uvcg_streaming_header(target);
--target_hdr->linked;
kfree(**class_array);
kfree(*class_array);
*class_array = NULL;
unlock:
mutex_unlock(&opts->lock);
out:
config_item_put(header);
mutex_unlock(su_mutex);
}
static struct configfs_item_operations uvcg_streaming_class_item_ops = {
.release = uvcg_config_item_release,
.allow_link = uvcg_streaming_class_allow_link,
.drop_link = uvcg_streaming_class_drop_link,
};
static const struct config_item_type uvcg_streaming_class_type = {
.ct_item_ops = &uvcg_streaming_class_item_ops,
.ct_owner = THIS_MODULE,
};
/* -----------------------------------------------------------------------------
* streaming/class
*/
static int uvcg_streaming_class_create_children(struct config_group *parent)
{
static const char * const names[] = { "fs", "hs", "ss" };
unsigned int i;
for (i = 0; i < ARRAY_SIZE(names); ++i) {
struct uvcg_streaming_class_group *group;
group = kzalloc(sizeof(*group), GFP_KERNEL);
if (!group)
return -ENOMEM;
group->name = names[i];
config_group_init_type_name(&group->group, group->name,
&uvcg_streaming_class_type);
configfs_add_default_group(&group->group, parent);
}
return 0;
}
static const struct uvcg_config_group_type uvcg_streaming_class_grp_type = {
.type = {
.ct_item_ops = &uvcg_config_item_ops,
.ct_owner = THIS_MODULE,
},
.name = "class",
.create_children = uvcg_streaming_class_create_children,
};
/* -----------------------------------------------------------------------------
* streaming
*/
static ssize_t uvcg_default_streaming_b_interface_number_show(
struct config_item *item, char *page)
{
struct config_group *group = to_config_group(item);
struct mutex *su_mutex = &group->cg_subsys->su_mutex;
struct config_item *opts_item;
struct f_uvc_opts *opts;
int result = 0;
mutex_lock(su_mutex); /* for navigating configfs hierarchy */
opts_item = item->ci_parent;
opts = to_f_uvc_opts(opts_item);
mutex_lock(&opts->lock);
result += sprintf(page, "%u\n", opts->streaming_interface);
mutex_unlock(&opts->lock);
mutex_unlock(su_mutex);
return result;
}
UVC_ATTR_RO(uvcg_default_streaming_, b_interface_number, bInterfaceNumber);
static struct configfs_attribute *uvcg_default_streaming_attrs[] = {
&uvcg_default_streaming_attr_b_interface_number,
NULL,
};
static const struct uvcg_config_group_type uvcg_streaming_grp_type = {
.type = {
.ct_item_ops = &uvcg_config_item_ops,
.ct_attrs = uvcg_default_streaming_attrs,
.ct_owner = THIS_MODULE,
},
.name = "streaming",
.children = (const struct uvcg_config_group_type*[]) {
&uvcg_streaming_header_grp_type,
&uvcg_uncompressed_grp_type,
&uvcg_mjpeg_grp_type,
&uvcg_color_matching_grp_type,
&uvcg_streaming_class_grp_type,
NULL,
},
};
/* -----------------------------------------------------------------------------
* UVC function
*/
static void uvc_func_item_release(struct config_item *item)
{
struct f_uvc_opts *opts = to_f_uvc_opts(item);
uvcg_config_remove_children(to_config_group(item));
usb_put_function_instance(&opts->func_inst);
}
static struct configfs_item_operations uvc_func_item_ops = {
.release = uvc_func_item_release,
};
#define UVCG_OPTS_ATTR(cname, aname, limit) \
static ssize_t f_uvc_opts_##cname##_show( \
struct config_item *item, char *page) \
{ \
struct f_uvc_opts *opts = to_f_uvc_opts(item); \
int result; \
\
mutex_lock(&opts->lock); \
result = sprintf(page, "%u\n", opts->cname); \
mutex_unlock(&opts->lock); \
\
return result; \
} \
\
static ssize_t \
f_uvc_opts_##cname##_store(struct config_item *item, \
const char *page, size_t len) \
{ \
struct f_uvc_opts *opts = to_f_uvc_opts(item); \
unsigned int num; \
int ret; \
\
mutex_lock(&opts->lock); \
if (opts->refcnt) { \
ret = -EBUSY; \
goto end; \
} \
\
ret = kstrtouint(page, 0, &num); \
if (ret) \
goto end; \
\
if (num > limit) { \
ret = -EINVAL; \
goto end; \
} \
opts->cname = num; \
ret = len; \
end: \
mutex_unlock(&opts->lock); \
return ret; \
} \
\
UVC_ATTR(f_uvc_opts_, cname, cname)
UVCG_OPTS_ATTR(streaming_interval, streaming_interval, 16);
UVCG_OPTS_ATTR(streaming_maxpacket, streaming_maxpacket, 3072);
UVCG_OPTS_ATTR(streaming_maxburst, streaming_maxburst, 15);
#undef UVCG_OPTS_ATTR
static struct configfs_attribute *uvc_attrs[] = {
&f_uvc_opts_attr_streaming_interval,
&f_uvc_opts_attr_streaming_maxpacket,
&f_uvc_opts_attr_streaming_maxburst,
NULL,
};
static const struct uvcg_config_group_type uvc_func_type = {
.type = {
.ct_item_ops = &uvc_func_item_ops,
.ct_attrs = uvc_attrs,
.ct_owner = THIS_MODULE,
},
.name = "",
.children = (const struct uvcg_config_group_type*[]) {
&uvcg_control_grp_type,
&uvcg_streaming_grp_type,
NULL,
},
};
int uvcg_attach_configfs(struct f_uvc_opts *opts)
{
int ret;
config_group_init_type_name(&opts->func_inst.group, uvc_func_type.name,
&uvc_func_type.type);
ret = uvcg_config_create_children(&opts->func_inst.group,
&uvc_func_type);
if (ret < 0)
config_group_put(&opts->func_inst.group);
return ret;
}
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