diff options
Diffstat (limited to 'drivers/usb/gadget/function/uvc_configfs.c')
| -rw-r--r-- | drivers/usb/gadget/function/uvc_configfs.c | 2524 |
1 files changed, 2524 insertions, 0 deletions
diff --git a/drivers/usb/gadget/function/uvc_configfs.c b/drivers/usb/gadget/function/uvc_configfs.c new file mode 100644 index 000000000..2db01170d --- /dev/null +++ b/drivers/usb/gadget/function/uvc_configfs.c @@ -0,0 +1,2524 @@ +// 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(0x0100); + 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); + if (!target_fmt) + goto out; + + 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); + if (!target_fmt) + goto out; + + 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; + +out: + 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; +} |