// 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 */ #include #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/ * 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(b_source_id, bSourceID, 8); UVCG_DEFAULT_OUTPUT_ATTR(i_terminal, iTerminal, 8); #undef UVCG_DEFAULT_OUTPUT_ATTR 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/ * 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/// */ 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/ */ 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; \ \ /* index values in uvc are never 0 */ \ if (!num) { \ ret = -EINVAL; \ 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/ */ 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; \ \ /* index values in uvc are never 0 */ \ if (!num) { \ ret = -EINVAL; \ 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 #define UVCG_OPTS_STRING_ATTR(cname, aname) \ static ssize_t f_uvc_opts_string_##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 = snprintf(page, sizeof(opts->aname), "%s", opts->aname);\ mutex_unlock(&opts->lock); \ \ return result; \ } \ \ static ssize_t f_uvc_opts_string_##cname##_store(struct config_item *item,\ const char *page, size_t len) \ { \ struct f_uvc_opts *opts = to_f_uvc_opts(item); \ int ret = 0; \ \ mutex_lock(&opts->lock); \ if (opts->refcnt) { \ ret = -EBUSY; \ goto end; \ } \ \ ret = snprintf(opts->aname, min(sizeof(opts->aname), len), \ "%s", page); \ \ end: \ mutex_unlock(&opts->lock); \ return ret; \ } \ \ UVC_ATTR(f_uvc_opts_string_, cname, aname) UVCG_OPTS_STRING_ATTR(function_name, function_name); #undef UVCG_OPTS_STRING_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, &f_uvc_opts_string_attr_function_name, 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; }