/* * Linux host USB redirector * * Copyright (c) 2005 Fabrice Bellard * * Copyright (c) 2008 Max Krasnyansky * Support for host device auto connect & disconnect * Major rewrite to support fully async operation * * Copyright 2008 TJ * Added flexible support for /dev/bus/usb /sys/bus/usb/devices in addition * to the legacy /proc/bus/usb USB device discovery and handling * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include "qemu-common.h" #include "qemu-timer.h" #include "monitor.h" #include "sysemu.h" #include #include #include #include #include #include "hw/usb.h" /* We redefine it to avoid version problems */ struct usb_ctrltransfer { uint8_t bRequestType; uint8_t bRequest; uint16_t wValue; uint16_t wIndex; uint16_t wLength; uint32_t timeout; void *data; }; struct usb_ctrlrequest { uint8_t bRequestType; uint8_t bRequest; uint16_t wValue; uint16_t wIndex; uint16_t wLength; }; typedef int USBScanFunc(void *opaque, int bus_num, int addr, int devpath, int class_id, int vendor_id, int product_id, const char *product_name, int speed); //#define DEBUG #ifdef DEBUG #define DPRINTF printf #else #define DPRINTF(...) #endif #define USBDBG_DEVOPENED "husb: opened %s/devices\n" #define USBPROCBUS_PATH "/proc/bus/usb" #define PRODUCT_NAME_SZ 32 #define MAX_ENDPOINTS 16 #define USBDEVBUS_PATH "/dev/bus/usb" #define USBSYSBUS_PATH "/sys/bus/usb" static char *usb_host_device_path; #define USB_FS_NONE 0 #define USB_FS_PROC 1 #define USB_FS_DEV 2 #define USB_FS_SYS 3 static int usb_fs_type; /* endpoint association data */ #define ISO_FRAME_DESC_PER_URB 32 #define ISO_URB_COUNT 3 #define INVALID_EP_TYPE 255 typedef struct AsyncURB AsyncURB; struct endp_data { uint8_t type; uint8_t halted; AsyncURB *iso_urb; int iso_urb_idx; int max_packet_size; }; enum { CTRL_STATE_IDLE = 0, CTRL_STATE_SETUP, CTRL_STATE_DATA, CTRL_STATE_ACK }; /* * Control transfer state. * Note that 'buffer' _must_ follow 'req' field because * we need contiguous buffer when we submit control URB. */ struct ctrl_struct { uint16_t len; uint16_t offset; uint8_t state; struct usb_ctrlrequest req; uint8_t buffer[8192]; }; struct USBAutoFilter { uint32_t bus_num; uint32_t addr; uint32_t vendor_id; uint32_t product_id; }; typedef struct USBHostDevice { USBDevice dev; int fd; uint8_t descr[1024]; int descr_len; int configuration; int ninterfaces; int closing; Notifier exit; struct ctrl_struct ctrl; struct endp_data endp_table[MAX_ENDPOINTS]; /* Host side address */ int bus_num; int addr; int devpath; struct USBAutoFilter match; QTAILQ_ENTRY(USBHostDevice) next; } USBHostDevice; static QTAILQ_HEAD(, USBHostDevice) hostdevs = QTAILQ_HEAD_INITIALIZER(hostdevs); static int usb_host_close(USBHostDevice *dev); static int parse_filter(const char *spec, struct USBAutoFilter *f); static void usb_host_auto_check(void *unused); static int usb_host_read_file(char *line, size_t line_size, const char *device_file, const char *device_name); static int is_isoc(USBHostDevice *s, int ep) { return s->endp_table[ep - 1].type == USBDEVFS_URB_TYPE_ISO; } static int is_valid(USBHostDevice *s, int ep) { return s->endp_table[ep - 1].type != INVALID_EP_TYPE; } static int is_halted(USBHostDevice *s, int ep) { return s->endp_table[ep - 1].halted; } static void clear_halt(USBHostDevice *s, int ep) { s->endp_table[ep - 1].halted = 0; } static void set_halt(USBHostDevice *s, int ep) { s->endp_table[ep - 1].halted = 1; } static void set_iso_urb(USBHostDevice *s, int ep, AsyncURB *iso_urb) { s->endp_table[ep - 1].iso_urb = iso_urb; } static AsyncURB *get_iso_urb(USBHostDevice *s, int ep) { return s->endp_table[ep - 1].iso_urb; } static void set_iso_urb_idx(USBHostDevice *s, int ep, int i) { s->endp_table[ep - 1].iso_urb_idx = i; } static int get_iso_urb_idx(USBHostDevice *s, int ep) { return s->endp_table[ep - 1].iso_urb_idx; } static int get_max_packet_size(USBHostDevice *s, int ep) { return s->endp_table[ep - 1].max_packet_size; } /* * Async URB state. * We always allocate iso packet descriptors even for bulk transfers * to simplify allocation and casts. */ struct AsyncURB { struct usbdevfs_urb urb; struct usbdevfs_iso_packet_desc isocpd[ISO_FRAME_DESC_PER_URB]; /* For regular async urbs */ USBPacket *packet; USBHostDevice *hdev; /* For buffered iso handling */ int iso_frame_idx; /* -1 means in flight */ }; static AsyncURB *async_alloc(void) { return (AsyncURB *) qemu_mallocz(sizeof(AsyncURB)); } static void async_free(AsyncURB *aurb) { qemu_free(aurb); } static void async_complete_ctrl(USBHostDevice *s, USBPacket *p) { switch(s->ctrl.state) { case CTRL_STATE_SETUP: if (p->len < s->ctrl.len) s->ctrl.len = p->len; s->ctrl.state = CTRL_STATE_DATA; p->len = 8; break; case CTRL_STATE_ACK: s->ctrl.state = CTRL_STATE_IDLE; p->len = 0; break; default: break; } } static void async_complete(void *opaque) { USBHostDevice *s = opaque; AsyncURB *aurb; while (1) { USBPacket *p; int r = ioctl(s->fd, USBDEVFS_REAPURBNDELAY, &aurb); if (r < 0) { if (errno == EAGAIN) { return; } if (errno == ENODEV && !s->closing) { printf("husb: device %d.%d disconnected\n", s->bus_num, s->addr); usb_host_close(s); usb_host_auto_check(NULL); return; } DPRINTF("husb: async. reap urb failed errno %d\n", errno); return; } DPRINTF("husb: async completed. aurb %p status %d alen %d\n", aurb, aurb->urb.status, aurb->urb.actual_length); /* If this is a buffered iso urb mark it as complete and don't do anything else (it is handled further in usb_host_handle_iso_data) */ if (aurb->iso_frame_idx == -1) { if (aurb->urb.status == -EPIPE) { set_halt(s, aurb->urb.endpoint & 0xf); } aurb->iso_frame_idx = 0; continue; } p = aurb->packet; if (p) { switch (aurb->urb.status) { case 0: p->len = aurb->urb.actual_length; if (aurb->urb.type == USBDEVFS_URB_TYPE_CONTROL) { async_complete_ctrl(s, p); } break; case -EPIPE: set_halt(s, p->devep); p->len = USB_RET_STALL; break; default: p->len = USB_RET_NAK; break; } usb_packet_complete(p); } async_free(aurb); } } static void async_cancel(USBPacket *unused, void *opaque) { AsyncURB *aurb = opaque; USBHostDevice *s = aurb->hdev; DPRINTF("husb: async cancel. aurb %p\n", aurb); /* Mark it as dead (see async_complete above) */ aurb->packet = NULL; int r = ioctl(s->fd, USBDEVFS_DISCARDURB, aurb); if (r < 0) { DPRINTF("husb: async. discard urb failed errno %d\n", errno); } } static int usb_host_claim_interfaces(USBHostDevice *dev, int configuration) { int dev_descr_len, config_descr_len; int interface, nb_interfaces; int ret, i; if (configuration == 0) /* address state - ignore */ return 1; DPRINTF("husb: claiming interfaces. config %d\n", configuration); i = 0; dev_descr_len = dev->descr[0]; if (dev_descr_len > dev->descr_len) { goto fail; } i += dev_descr_len; while (i < dev->descr_len) { DPRINTF("husb: i is %d, descr_len is %d, dl %d, dt %d\n", i, dev->descr_len, dev->descr[i], dev->descr[i+1]); if (dev->descr[i+1] != USB_DT_CONFIG) { i += dev->descr[i]; continue; } config_descr_len = dev->descr[i]; printf("husb: config #%d need %d\n", dev->descr[i + 5], configuration); if (configuration < 0 || configuration == dev->descr[i + 5]) { configuration = dev->descr[i + 5]; break; } i += config_descr_len; } if (i >= dev->descr_len) { fprintf(stderr, "husb: update iface failed. no matching configuration\n"); goto fail; } nb_interfaces = dev->descr[i + 4]; #ifdef USBDEVFS_DISCONNECT /* earlier Linux 2.4 do not support that */ { struct usbdevfs_ioctl ctrl; for (interface = 0; interface < nb_interfaces; interface++) { ctrl.ioctl_code = USBDEVFS_DISCONNECT; ctrl.ifno = interface; ctrl.data = 0; ret = ioctl(dev->fd, USBDEVFS_IOCTL, &ctrl); if (ret < 0 && errno != ENODATA) { perror("USBDEVFS_DISCONNECT"); goto fail; } } } #endif /* XXX: only grab if all interfaces are free */ for (interface = 0; interface < nb_interfaces; interface++) { ret = ioctl(dev->fd, USBDEVFS_CLAIMINTERFACE, &interface); if (ret < 0) { if (errno == EBUSY) { printf("husb: update iface. device already grabbed\n"); } else { perror("husb: failed to claim interface"); } fail: return 0; } } printf("husb: %d interfaces claimed for configuration %d\n", nb_interfaces, configuration); dev->ninterfaces = nb_interfaces; dev->configuration = configuration; return 1; } static int usb_host_release_interfaces(USBHostDevice *s) { int ret, i; DPRINTF("husb: releasing interfaces\n"); for (i = 0; i < s->ninterfaces; i++) { ret = ioctl(s->fd, USBDEVFS_RELEASEINTERFACE, &i); if (ret < 0) { perror("husb: failed to release interface"); return 0; } } return 1; } static void usb_host_handle_reset(USBDevice *dev) { USBHostDevice *s = DO_UPCAST(USBHostDevice, dev, dev); DPRINTF("husb: reset device %u.%u\n", s->bus_num, s->addr); ioctl(s->fd, USBDEVFS_RESET); usb_host_claim_interfaces(s, s->configuration); } static void usb_host_handle_destroy(USBDevice *dev) { USBHostDevice *s = (USBHostDevice *)dev; usb_host_close(s); QTAILQ_REMOVE(&hostdevs, s, next); qemu_remove_exit_notifier(&s->exit); } static int usb_linux_update_endp_table(USBHostDevice *s); /* iso data is special, we need to keep enough urbs in flight to make sure that the controller never runs out of them, otherwise the device will likely suffer a buffer underrun / overrun. */ static AsyncURB *usb_host_alloc_iso(USBHostDevice *s, uint8_t ep, int in) { AsyncURB *aurb; int i, j, len = get_max_packet_size(s, ep); aurb = qemu_mallocz(ISO_URB_COUNT * sizeof(*aurb)); for (i = 0; i < ISO_URB_COUNT; i++) { aurb[i].urb.endpoint = ep; aurb[i].urb.buffer_length = ISO_FRAME_DESC_PER_URB * len; aurb[i].urb.buffer = qemu_malloc(aurb[i].urb.buffer_length); aurb[i].urb.type = USBDEVFS_URB_TYPE_ISO; aurb[i].urb.flags = USBDEVFS_URB_ISO_ASAP; aurb[i].urb.number_of_packets = ISO_FRAME_DESC_PER_URB; for (j = 0 ; j < ISO_FRAME_DESC_PER_URB; j++) aurb[i].urb.iso_frame_desc[j].length = len; if (in) { aurb[i].urb.endpoint |= 0x80; /* Mark as fully consumed (idle) */ aurb[i].iso_frame_idx = ISO_FRAME_DESC_PER_URB; } } set_iso_urb(s, ep, aurb); return aurb; } static void usb_host_stop_n_free_iso(USBHostDevice *s, uint8_t ep) { AsyncURB *aurb; int i, ret, killed = 0, free = 1; aurb = get_iso_urb(s, ep); if (!aurb) { return; } for (i = 0; i < ISO_URB_COUNT; i++) { /* in flight? */ if (aurb[i].iso_frame_idx == -1) { ret = ioctl(s->fd, USBDEVFS_DISCARDURB, &aurb[i]); if (ret < 0) { printf("husb: discard isoc in urb failed errno %d\n", errno); free = 0; continue; } killed++; } } /* Make sure any urbs we've killed are reaped before we free them */ if (killed) { async_complete(s); } for (i = 0; i < ISO_URB_COUNT; i++) { qemu_free(aurb[i].urb.buffer); } if (free) qemu_free(aurb); else printf("husb: leaking iso urbs because of discard failure\n"); set_iso_urb(s, ep, NULL); } static int urb_status_to_usb_ret(int status) { switch (status) { case -EPIPE: return USB_RET_STALL; default: return USB_RET_NAK; } } static int usb_host_handle_iso_data(USBHostDevice *s, USBPacket *p) { AsyncURB *aurb; int i, j, ret, max_packet_size, len = 0; max_packet_size = get_max_packet_size(s, p->devep); if (max_packet_size == 0) return USB_RET_NAK; aurb = get_iso_urb(s, p->devep); if (!aurb) { aurb = usb_host_alloc_iso(s, p->devep, 1); } i = get_iso_urb_idx(s, p->devep); j = aurb[i].iso_frame_idx; if (j >= 0 && j < ISO_FRAME_DESC_PER_URB) { /* Check urb status */ if (aurb[i].urb.status) { len = urb_status_to_usb_ret(aurb[i].urb.status); /* Move to the next urb */ aurb[i].iso_frame_idx = ISO_FRAME_DESC_PER_URB - 1; /* Check frame status */ } else if (aurb[i].urb.iso_frame_desc[j].status) { len = urb_status_to_usb_ret(aurb[i].urb.iso_frame_desc[j].status); /* Check the frame fits */ } else if (aurb[i].urb.iso_frame_desc[j].actual_length > p->len) { printf("husb: error received isoc data is larger then packet\n"); len = USB_RET_NAK; /* All good copy data over */ } else { len = aurb[i].urb.iso_frame_desc[j].actual_length; memcpy(p->data, aurb[i].urb.buffer + j * aurb[i].urb.iso_frame_desc[0].length, len); } aurb[i].iso_frame_idx++; if (aurb[i].iso_frame_idx == ISO_FRAME_DESC_PER_URB) { i = (i + 1) % ISO_URB_COUNT; set_iso_urb_idx(s, p->devep, i); } } /* (Re)-submit all fully consumed urbs */ for (i = 0; i < ISO_URB_COUNT; i++) { if (aurb[i].iso_frame_idx == ISO_FRAME_DESC_PER_URB) { ret = ioctl(s->fd, USBDEVFS_SUBMITURB, &aurb[i]); if (ret < 0) { printf("husb error submitting isoc urb %d: %d\n", i, errno); if (len == 0) { switch(errno) { case ETIMEDOUT: len = USB_RET_NAK; case EPIPE: default: len = USB_RET_STALL; } } break; } aurb[i].iso_frame_idx = -1; } } return len; } static int usb_host_handle_data(USBHostDevice *s, USBPacket *p) { struct usbdevfs_urb *urb; AsyncURB *aurb; int ret; uint8_t ep; if (!is_valid(s, p->devep)) { return USB_RET_NAK; } if (p->pid == USB_TOKEN_IN) { ep = p->devep | 0x80; } else { ep = p->devep; } if (is_halted(s, p->devep)) { ret = ioctl(s->fd, USBDEVFS_CLEAR_HALT, &ep); if (ret < 0) { DPRINTF("husb: failed to clear halt. ep 0x%x errno %d\n", ep, errno); return USB_RET_NAK; } clear_halt(s, p->devep); } if (is_isoc(s, p->devep) && p->pid == USB_TOKEN_IN) return usb_host_handle_iso_data(s, p); aurb = async_alloc(); aurb->hdev = s; aurb->packet = p; urb = &aurb->urb; urb->endpoint = ep; urb->buffer = p->data; urb->buffer_length = p->len; if (is_isoc(s, p->devep)) { /* Setup ISOC transfer */ urb->type = USBDEVFS_URB_TYPE_ISO; urb->flags = USBDEVFS_URB_ISO_ASAP; urb->number_of_packets = 1; urb->iso_frame_desc[0].length = p->len; } else { /* Setup bulk transfer */ urb->type = USBDEVFS_URB_TYPE_BULK; } urb->usercontext = s; ret = ioctl(s->fd, USBDEVFS_SUBMITURB, urb); DPRINTF("husb: data submit. ep 0x%x len %u aurb %p\n", urb->endpoint, p->len, aurb); if (ret < 0) { DPRINTF("husb: submit failed. errno %d\n", errno); async_free(aurb); switch(errno) { case ETIMEDOUT: return USB_RET_NAK; case EPIPE: default: return USB_RET_STALL; } } usb_defer_packet(p, async_cancel, aurb); return USB_RET_ASYNC; } static int ctrl_error(void) { if (errno == ETIMEDOUT) { return USB_RET_NAK; } else { return USB_RET_STALL; } } static int usb_host_set_address(USBHostDevice *s, int addr) { DPRINTF("husb: ctrl set addr %u\n", addr); s->dev.addr = addr; return 0; } static int usb_host_set_config(USBHostDevice *s, int config) { usb_host_release_interfaces(s); int ret = ioctl(s->fd, USBDEVFS_SETCONFIGURATION, &config); DPRINTF("husb: ctrl set config %d ret %d errno %d\n", config, ret, errno); if (ret < 0) { return ctrl_error(); } usb_host_claim_interfaces(s, config); return 0; } static int usb_host_set_interface(USBHostDevice *s, int iface, int alt) { struct usbdevfs_setinterface si; int i, ret; for (i = 1; i < MAX_ENDPOINTS; i++) { if (is_isoc(s, i)) { usb_host_stop_n_free_iso(s, i); } } si.interface = iface; si.altsetting = alt; ret = ioctl(s->fd, USBDEVFS_SETINTERFACE, &si); DPRINTF("husb: ctrl set iface %d altset %d ret %d errno %d\n", iface, alt, ret, errno); if (ret < 0) { return ctrl_error(); } usb_linux_update_endp_table(s); return 0; } static int usb_host_handle_control(USBHostDevice *s, USBPacket *p) { struct usbdevfs_urb *urb; AsyncURB *aurb; int ret, value, index; int buffer_len; /* * Process certain standard device requests. * These are infrequent and are processed synchronously. */ value = le16_to_cpu(s->ctrl.req.wValue); index = le16_to_cpu(s->ctrl.req.wIndex); DPRINTF("husb: ctrl type 0x%x req 0x%x val 0x%x index %u len %u\n", s->ctrl.req.bRequestType, s->ctrl.req.bRequest, value, index, s->ctrl.len); if (s->ctrl.req.bRequestType == 0) { switch (s->ctrl.req.bRequest) { case USB_REQ_SET_ADDRESS: return usb_host_set_address(s, value); case USB_REQ_SET_CONFIGURATION: return usb_host_set_config(s, value & 0xff); } } if (s->ctrl.req.bRequestType == 1 && s->ctrl.req.bRequest == USB_REQ_SET_INTERFACE) { return usb_host_set_interface(s, index, value); } /* The rest are asynchronous */ buffer_len = 8 + s->ctrl.len; if (buffer_len > sizeof(s->ctrl.buffer)) { fprintf(stderr, "husb: ctrl buffer too small (%u > %zu)\n", buffer_len, sizeof(s->ctrl.buffer)); return USB_RET_STALL; } aurb = async_alloc(); aurb->hdev = s; aurb->packet = p; /* * Setup ctrl transfer. * * s->ctrl is laid out such that data buffer immediately follows * 'req' struct which is exactly what usbdevfs expects. */ urb = &aurb->urb; urb->type = USBDEVFS_URB_TYPE_CONTROL; urb->endpoint = p->devep; urb->buffer = &s->ctrl.req; urb->buffer_length = buffer_len; urb->usercontext = s; ret = ioctl(s->fd, USBDEVFS_SUBMITURB, urb); DPRINTF("husb: submit ctrl. len %u aurb %p\n", urb->buffer_length, aurb); if (ret < 0) { DPRINTF("husb: submit failed. errno %d\n", errno); async_free(aurb); switch(errno) { case ETIMEDOUT: return USB_RET_NAK; case EPIPE: default: return USB_RET_STALL; } } usb_defer_packet(p, async_cancel, aurb); return USB_RET_ASYNC; } static int do_token_setup(USBDevice *dev, USBPacket *p) { USBHostDevice *s = (USBHostDevice *) dev; int ret = 0; if (p->len != 8) { return USB_RET_STALL; } memcpy(&s->ctrl.req, p->data, 8); s->ctrl.len = le16_to_cpu(s->ctrl.req.wLength); s->ctrl.offset = 0; s->ctrl.state = CTRL_STATE_SETUP; if (s->ctrl.req.bRequestType & USB_DIR_IN) { ret = usb_host_handle_control(s, p); if (ret < 0) { return ret; } if (ret < s->ctrl.len) { s->ctrl.len = ret; } s->ctrl.state = CTRL_STATE_DATA; } else { if (s->ctrl.len == 0) { s->ctrl.state = CTRL_STATE_ACK; } else { s->ctrl.state = CTRL_STATE_DATA; } } return ret; } static int do_token_in(USBDevice *dev, USBPacket *p) { USBHostDevice *s = (USBHostDevice *) dev; int ret = 0; if (p->devep != 0) { return usb_host_handle_data(s, p); } switch(s->ctrl.state) { case CTRL_STATE_ACK: if (!(s->ctrl.req.bRequestType & USB_DIR_IN)) { ret = usb_host_handle_control(s, p); if (ret == USB_RET_ASYNC) { return USB_RET_ASYNC; } s->ctrl.state = CTRL_STATE_IDLE; return ret > 0 ? 0 : ret; } return 0; case CTRL_STATE_DATA: if (s->ctrl.req.bRequestType & USB_DIR_IN) { int len = s->ctrl.len - s->ctrl.offset; if (len > p->len) { len = p->len; } memcpy(p->data, s->ctrl.buffer + s->ctrl.offset, len); s->ctrl.offset += len; if (s->ctrl.offset >= s->ctrl.len) { s->ctrl.state = CTRL_STATE_ACK; } return len; } s->ctrl.state = CTRL_STATE_IDLE; return USB_RET_STALL; default: return USB_RET_STALL; } } static int do_token_out(USBDevice *dev, USBPacket *p) { USBHostDevice *s = (USBHostDevice *) dev; if (p->devep != 0) { return usb_host_handle_data(s, p); } switch(s->ctrl.state) { case CTRL_STATE_ACK: if (s->ctrl.req.bRequestType & USB_DIR_IN) { s->ctrl.state = CTRL_STATE_IDLE; /* transfer OK */ } else { /* ignore additional output */ } return 0; case CTRL_STATE_DATA: if (!(s->ctrl.req.bRequestType & USB_DIR_IN)) { int len = s->ctrl.len - s->ctrl.offset; if (len > p->len) { len = p->len; } memcpy(s->ctrl.buffer + s->ctrl.offset, p->data, len); s->ctrl.offset += len; if (s->ctrl.offset >= s->ctrl.len) { s->ctrl.state = CTRL_STATE_ACK; } return len; } s->ctrl.state = CTRL_STATE_IDLE; return USB_RET_STALL; default: return USB_RET_STALL; } } /* * Packet handler. * Called by the HC (host controller). * * Returns length of the transaction or one of the USB_RET_XXX codes. */ static int usb_host_handle_packet(USBDevice *s, USBPacket *p) { switch(p->pid) { case USB_MSG_ATTACH: s->state = USB_STATE_ATTACHED; return 0; case USB_MSG_DETACH: s->state = USB_STATE_NOTATTACHED; return 0; case USB_MSG_RESET: s->remote_wakeup = 0; s->addr = 0; s->state = USB_STATE_DEFAULT; s->info->handle_reset(s); return 0; } /* Rest of the PIDs must match our address */ if (s->state < USB_STATE_DEFAULT || p->devaddr != s->addr) { return USB_RET_NODEV; } switch (p->pid) { case USB_TOKEN_SETUP: return do_token_setup(s, p); case USB_TOKEN_IN: return do_token_in(s, p); case USB_TOKEN_OUT: return do_token_out(s, p); default: return USB_RET_STALL; } } static int usb_linux_get_configuration(USBHostDevice *s) { uint8_t configuration; struct usb_ctrltransfer ct; int ret; if (usb_fs_type == USB_FS_SYS) { char device_name[32], line[1024]; int configuration; sprintf(device_name, "%d-%d", s->bus_num, s->devpath); if (!usb_host_read_file(line, sizeof(line), "bConfigurationValue", device_name)) { goto usbdevfs; } if (sscanf(line, "%d", &configuration) != 1) { goto usbdevfs; } return configuration; } usbdevfs: ct.bRequestType = USB_DIR_IN; ct.bRequest = USB_REQ_GET_CONFIGURATION; ct.wValue = 0; ct.wIndex = 0; ct.wLength = 1; ct.data = &configuration; ct.timeout = 50; ret = ioctl(s->fd, USBDEVFS_CONTROL, &ct); if (ret < 0) { perror("usb_linux_get_configuration"); return -1; } /* in address state */ if (configuration == 0) { return -1; } return configuration; } static uint8_t usb_linux_get_alt_setting(USBHostDevice *s, uint8_t configuration, uint8_t interface) { uint8_t alt_setting; struct usb_ctrltransfer ct; int ret; if (usb_fs_type == USB_FS_SYS) { char device_name[64], line[1024]; int alt_setting; sprintf(device_name, "%d-%d:%d.%d", s->bus_num, s->devpath, (int)configuration, (int)interface); if (!usb_host_read_file(line, sizeof(line), "bAlternateSetting", device_name)) { goto usbdevfs; } if (sscanf(line, "%d", &alt_setting) != 1) { goto usbdevfs; } return alt_setting; } usbdevfs: ct.bRequestType = USB_DIR_IN | USB_RECIP_INTERFACE; ct.bRequest = USB_REQ_GET_INTERFACE; ct.wValue = 0; ct.wIndex = interface; ct.wLength = 1; ct.data = &alt_setting; ct.timeout = 50; ret = ioctl(s->fd, USBDEVFS_CONTROL, &ct); if (ret < 0) { /* Assume alt 0 on error */ return 0; } return alt_setting; } /* returns 1 on problem encountered or 0 for success */ static int usb_linux_update_endp_table(USBHostDevice *s) { uint8_t *descriptors; uint8_t devep, type, configuration, alt_interface; int interface, length, i; for (i = 0; i < MAX_ENDPOINTS; i++) s->endp_table[i].type = INVALID_EP_TYPE; i = usb_linux_get_configuration(s); if (i < 0) return 1; configuration = i; /* get the desired configuration, interface, and endpoint descriptors * from device description */ descriptors = &s->descr[18]; length = s->descr_len - 18; i = 0; if (descriptors[i + 1] != USB_DT_CONFIG || descriptors[i + 5] != configuration) { DPRINTF("invalid descriptor data - configuration\n"); return 1; } i += descriptors[i]; while (i < length) { if (descriptors[i + 1] != USB_DT_INTERFACE || (descriptors[i + 1] == USB_DT_INTERFACE && descriptors[i + 4] == 0)) { i += descriptors[i]; continue; } interface = descriptors[i + 2]; alt_interface = usb_linux_get_alt_setting(s, configuration, interface); /* the current interface descriptor is the active interface * and has endpoints */ if (descriptors[i + 3] != alt_interface) { i += descriptors[i]; continue; } /* advance to the endpoints */ while (i < length && descriptors[i +1] != USB_DT_ENDPOINT) { i += descriptors[i]; } if (i >= length) break; while (i < length) { if (descriptors[i + 1] != USB_DT_ENDPOINT) { break; } devep = descriptors[i + 2]; switch (descriptors[i + 3] & 0x3) { case 0x00: type = USBDEVFS_URB_TYPE_CONTROL; break; case 0x01: type = USBDEVFS_URB_TYPE_ISO; s->endp_table[(devep & 0xf) - 1].max_packet_size = descriptors[i + 4] + (descriptors[i + 5] << 8); break; case 0x02: type = USBDEVFS_URB_TYPE_BULK; break; case 0x03: type = USBDEVFS_URB_TYPE_INTERRUPT; break; default: DPRINTF("usb_host: malformed endpoint type\n"); type = USBDEVFS_URB_TYPE_BULK; } s->endp_table[(devep & 0xf) - 1].type = type; s->endp_table[(devep & 0xf) - 1].halted = 0; i += descriptors[i]; } } return 0; } static int usb_host_open(USBHostDevice *dev, int bus_num, int addr, int devpath, const char *prod_name) { int fd = -1, ret; struct usbdevfs_connectinfo ci; char buf[1024]; if (dev->fd != -1) { goto fail; } printf("husb: open device %d.%d\n", bus_num, addr); if (!usb_host_device_path) { perror("husb: USB Host Device Path not set"); goto fail; } snprintf(buf, sizeof(buf), "%s/%03d/%03d", usb_host_device_path, bus_num, addr); fd = open(buf, O_RDWR | O_NONBLOCK); if (fd < 0) { perror(buf); goto fail; } DPRINTF("husb: opened %s\n", buf); dev->bus_num = bus_num; dev->addr = addr; dev->devpath = devpath; dev->fd = fd; /* read the device description */ dev->descr_len = read(fd, dev->descr, sizeof(dev->descr)); if (dev->descr_len <= 0) { perror("husb: reading device data failed"); goto fail; } #ifdef DEBUG { int x; printf("=== begin dumping device descriptor data ===\n"); for (x = 0; x < dev->descr_len; x++) { printf("%02x ", dev->descr[x]); } printf("\n=== end dumping device descriptor data ===\n"); } #endif /* * Initial configuration is -1 which makes us claim first * available config. We used to start with 1, which does not * always work. I've seen devices where first config starts * with 2. */ if (!usb_host_claim_interfaces(dev, -1)) { goto fail; } ret = ioctl(fd, USBDEVFS_CONNECTINFO, &ci); if (ret < 0) { perror("usb_host_device_open: USBDEVFS_CONNECTINFO"); goto fail; } printf("husb: grabbed usb device %d.%d\n", bus_num, addr); ret = usb_linux_update_endp_table(dev); if (ret) { goto fail; } if (ci.slow) { dev->dev.speed = USB_SPEED_LOW; } else { dev->dev.speed = USB_SPEED_HIGH; } if (!prod_name || prod_name[0] == '\0') { snprintf(dev->dev.product_desc, sizeof(dev->dev.product_desc), "host:%d.%d", bus_num, addr); } else { pstrcpy(dev->dev.product_desc, sizeof(dev->dev.product_desc), prod_name); } /* USB devio uses 'write' flag to check for async completions */ qemu_set_fd_handler(dev->fd, NULL, async_complete, dev); usb_device_attach(&dev->dev); return 0; fail: dev->fd = -1; if (fd != -1) { close(fd); } return -1; } static int usb_host_close(USBHostDevice *dev) { int i; if (dev->fd == -1) { return -1; } qemu_set_fd_handler(dev->fd, NULL, NULL, NULL); dev->closing = 1; for (i = 1; i < MAX_ENDPOINTS; i++) { if (is_isoc(dev, i)) { usb_host_stop_n_free_iso(dev, i); } } async_complete(dev); dev->closing = 0; usb_device_detach(&dev->dev); ioctl(dev->fd, USBDEVFS_RESET); close(dev->fd); dev->fd = -1; return 0; } static void usb_host_exit_notifier(struct Notifier* n) { USBHostDevice *s = container_of(n, USBHostDevice, exit); if (s->fd != -1) { ioctl(s->fd, USBDEVFS_RESET); } } static int usb_host_initfn(USBDevice *dev) { USBHostDevice *s = DO_UPCAST(USBHostDevice, dev, dev); dev->auto_attach = 0; s->fd = -1; QTAILQ_INSERT_TAIL(&hostdevs, s, next); s->exit.notify = usb_host_exit_notifier; qemu_add_exit_notifier(&s->exit); usb_host_auto_check(NULL); return 0; } static struct USBDeviceInfo usb_host_dev_info = { .product_desc = "USB Host Device", .qdev.name = "usb-host", .qdev.size = sizeof(USBHostDevice), .init = usb_host_initfn, .handle_packet = usb_host_handle_packet, .handle_reset = usb_host_handle_reset, .handle_destroy = usb_host_handle_destroy, .usbdevice_name = "host", .usbdevice_init = usb_host_device_open, .qdev.props = (Property[]) { DEFINE_PROP_UINT32("hostbus", USBHostDevice, match.bus_num, 0), DEFINE_PROP_UINT32("hostaddr", USBHostDevice, match.addr, 0), DEFINE_PROP_HEX32("vendorid", USBHostDevice, match.vendor_id, 0), DEFINE_PROP_HEX32("productid", USBHostDevice, match.product_id, 0), DEFINE_PROP_END_OF_LIST(), }, }; static void usb_host_register_devices(void) { usb_qdev_register(&usb_host_dev_info); } device_init(usb_host_register_devices) USBDevice *usb_host_device_open(const char *devname) { struct USBAutoFilter filter; USBDevice *dev; char *p; dev = usb_create(NULL /* FIXME */, "usb-host"); if (strstr(devname, "auto:")) { if (parse_filter(devname, &filter) < 0) { goto fail; } } else { if ((p = strchr(devname, '.'))) { filter.bus_num = strtoul(devname, NULL, 0); filter.addr = strtoul(p + 1, NULL, 0); filter.vendor_id = 0; filter.product_id = 0; } else if ((p = strchr(devname, ':'))) { filter.bus_num = 0; filter.addr = 0; filter.vendor_id = strtoul(devname, NULL, 16); filter.product_id = strtoul(p + 1, NULL, 16); } else { goto fail; } } qdev_prop_set_uint32(&dev->qdev, "hostbus", filter.bus_num); qdev_prop_set_uint32(&dev->qdev, "hostaddr", filter.addr); qdev_prop_set_uint32(&dev->qdev, "vendorid", filter.vendor_id); qdev_prop_set_uint32(&dev->qdev, "productid", filter.product_id); qdev_init_nofail(&dev->qdev); return dev; fail: qdev_free(&dev->qdev); return NULL; } int usb_host_device_close(const char *devname) { #if 0 char product_name[PRODUCT_NAME_SZ]; int bus_num, addr; USBHostDevice *s; if (strstr(devname, "auto:")) { return usb_host_auto_del(devname); } if (usb_host_find_device(&bus_num, &addr, product_name, sizeof(product_name), devname) < 0) { return -1; } s = hostdev_find(bus_num, addr); if (s) { usb_device_delete_addr(s->bus_num, s->dev.addr); return 0; } #endif return -1; } static int get_tag_value(char *buf, int buf_size, const char *str, const char *tag, const char *stopchars) { const char *p; char *q; p = strstr(str, tag); if (!p) { return -1; } p += strlen(tag); while (qemu_isspace(*p)) { p++; } q = buf; while (*p != '\0' && !strchr(stopchars, *p)) { if ((q - buf) < (buf_size - 1)) { *q++ = *p; } p++; } *q = '\0'; return q - buf; } /* * Use /proc/bus/usb/devices or /dev/bus/usb/devices file to determine * host's USB devices. This is legacy support since many distributions * are moving to /sys/bus/usb */ static int usb_host_scan_dev(void *opaque, USBScanFunc *func) { FILE *f = NULL; char line[1024]; char buf[1024]; int bus_num, addr, speed, device_count, class_id, product_id, vendor_id; char product_name[512]; int ret = 0; if (!usb_host_device_path) { perror("husb: USB Host Device Path not set"); goto the_end; } snprintf(line, sizeof(line), "%s/devices", usb_host_device_path); f = fopen(line, "r"); if (!f) { perror("husb: cannot open devices file"); goto the_end; } device_count = 0; bus_num = addr = speed = class_id = product_id = vendor_id = 0; for(;;) { if (fgets(line, sizeof(line), f) == NULL) { break; } if (strlen(line) > 0) { line[strlen(line) - 1] = '\0'; } if (line[0] == 'T' && line[1] == ':') { if (device_count && (vendor_id || product_id)) { /* New device. Add the previously discovered device. */ ret = func(opaque, bus_num, addr, 0, class_id, vendor_id, product_id, product_name, speed); if (ret) { goto the_end; } } if (get_tag_value(buf, sizeof(buf), line, "Bus=", " ") < 0) { goto fail; } bus_num = atoi(buf); if (get_tag_value(buf, sizeof(buf), line, "Dev#=", " ") < 0) { goto fail; } addr = atoi(buf); if (get_tag_value(buf, sizeof(buf), line, "Spd=", " ") < 0) { goto fail; } if (!strcmp(buf, "480")) { speed = USB_SPEED_HIGH; } else if (!strcmp(buf, "1.5")) { speed = USB_SPEED_LOW; } else { speed = USB_SPEED_FULL; } product_name[0] = '\0'; class_id = 0xff; device_count++; product_id = 0; vendor_id = 0; } else if (line[0] == 'P' && line[1] == ':') { if (get_tag_value(buf, sizeof(buf), line, "Vendor=", " ") < 0) { goto fail; } vendor_id = strtoul(buf, NULL, 16); if (get_tag_value(buf, sizeof(buf), line, "ProdID=", " ") < 0) { goto fail; } product_id = strtoul(buf, NULL, 16); } else if (line[0] == 'S' && line[1] == ':') { if (get_tag_value(buf, sizeof(buf), line, "Product=", "") < 0) { goto fail; } pstrcpy(product_name, sizeof(product_name), buf); } else if (line[0] == 'D' && line[1] == ':') { if (get_tag_value(buf, sizeof(buf), line, "Cls=", " (") < 0) { goto fail; } class_id = strtoul(buf, NULL, 16); } fail: ; } if (device_count && (vendor_id || product_id)) { /* Add the last device. */ ret = func(opaque, bus_num, addr, 0, class_id, vendor_id, product_id, product_name, speed); } the_end: if (f) { fclose(f); } return ret; } /* * Read sys file-system device file * * @line address of buffer to put file contents in * @line_size size of line * @device_file path to device file (printf format string) * @device_name device being opened (inserted into device_file) * * @return 0 failed, 1 succeeded ('line' contains data) */ static int usb_host_read_file(char *line, size_t line_size, const char *device_file, const char *device_name) { FILE *f; int ret = 0; char filename[PATH_MAX]; snprintf(filename, PATH_MAX, USBSYSBUS_PATH "/devices/%s/%s", device_name, device_file); f = fopen(filename, "r"); if (f) { ret = fgets(line, line_size, f) != NULL; fclose(f); } return ret; } /* * Use /sys/bus/usb/devices/ directory to determine host's USB * devices. * * This code is based on Robert Schiele's original patches posted to * the Novell bug-tracker https://bugzilla.novell.com/show_bug.cgi?id=241950 */ static int usb_host_scan_sys(void *opaque, USBScanFunc *func) { DIR *dir = NULL; char line[1024]; int bus_num, addr, devpath, speed, class_id, product_id, vendor_id; int ret = 0; char product_name[512]; struct dirent *de; dir = opendir(USBSYSBUS_PATH "/devices"); if (!dir) { perror("husb: cannot open devices directory"); goto the_end; } while ((de = readdir(dir))) { if (de->d_name[0] != '.' && !strchr(de->d_name, ':')) { char *tmpstr = de->d_name; if (!strncmp(de->d_name, "usb", 3)) { tmpstr += 3; } if (sscanf(tmpstr, "%d-%d", &bus_num, &devpath) < 1) { goto the_end; } if (!usb_host_read_file(line, sizeof(line), "devnum", de->d_name)) { goto the_end; } if (sscanf(line, "%d", &addr) != 1) { goto the_end; } if (!usb_host_read_file(line, sizeof(line), "bDeviceClass", de->d_name)) { goto the_end; } if (sscanf(line, "%x", &class_id) != 1) { goto the_end; } if (!usb_host_read_file(line, sizeof(line), "idVendor", de->d_name)) { goto the_end; } if (sscanf(line, "%x", &vendor_id) != 1) { goto the_end; } if (!usb_host_read_file(line, sizeof(line), "idProduct", de->d_name)) { goto the_end; } if (sscanf(line, "%x", &product_id) != 1) { goto the_end; } if (!usb_host_read_file(line, sizeof(line), "product", de->d_name)) { *product_name = 0; } else { if (strlen(line) > 0) { line[strlen(line) - 1] = '\0'; } pstrcpy(product_name, sizeof(product_name), line); } if (!usb_host_read_file(line, sizeof(line), "speed", de->d_name)) { goto the_end; } if (!strcmp(line, "480\n")) { speed = USB_SPEED_HIGH; } else if (!strcmp(line, "1.5\n")) { speed = USB_SPEED_LOW; } else { speed = USB_SPEED_FULL; } ret = func(opaque, bus_num, addr, devpath, class_id, vendor_id, product_id, product_name, speed); if (ret) { goto the_end; } } } the_end: if (dir) { closedir(dir); } return ret; } /* * Determine how to access the host's USB devices and call the * specific support function. */ static int usb_host_scan(void *opaque, USBScanFunc *func) { Monitor *mon = cur_mon; FILE *f = NULL; DIR *dir = NULL; int ret = 0; const char *fs_type[] = {"unknown", "proc", "dev", "sys"}; char devpath[PATH_MAX]; /* only check the host once */ if (!usb_fs_type) { dir = opendir(USBSYSBUS_PATH "/devices"); if (dir) { /* devices found in /dev/bus/usb/ (yes - not a mistake!) */ strcpy(devpath, USBDEVBUS_PATH); usb_fs_type = USB_FS_SYS; closedir(dir); DPRINTF(USBDBG_DEVOPENED, USBSYSBUS_PATH); goto found_devices; } f = fopen(USBPROCBUS_PATH "/devices", "r"); if (f) { /* devices found in /proc/bus/usb/ */ strcpy(devpath, USBPROCBUS_PATH); usb_fs_type = USB_FS_PROC; fclose(f); DPRINTF(USBDBG_DEVOPENED, USBPROCBUS_PATH); goto found_devices; } /* try additional methods if an access method hasn't been found yet */ f = fopen(USBDEVBUS_PATH "/devices", "r"); if (f) { /* devices found in /dev/bus/usb/ */ strcpy(devpath, USBDEVBUS_PATH); usb_fs_type = USB_FS_DEV; fclose(f); DPRINTF(USBDBG_DEVOPENED, USBDEVBUS_PATH); goto found_devices; } found_devices: if (!usb_fs_type) { if (mon) { monitor_printf(mon, "husb: unable to access USB devices\n"); } return -ENOENT; } /* the module setting (used later for opening devices) */ usb_host_device_path = qemu_mallocz(strlen(devpath)+1); strcpy(usb_host_device_path, devpath); if (mon) { monitor_printf(mon, "husb: using %s file-system with %s\n", fs_type[usb_fs_type], usb_host_device_path); } } switch (usb_fs_type) { case USB_FS_PROC: case USB_FS_DEV: ret = usb_host_scan_dev(opaque, func); break; case USB_FS_SYS: ret = usb_host_scan_sys(opaque, func); break; default: ret = -EINVAL; break; } return ret; } static QEMUTimer *usb_auto_timer; static int usb_host_auto_scan(void *opaque, int bus_num, int addr, int devpath, int class_id, int vendor_id, int product_id, const char *product_name, int speed) { struct USBAutoFilter *f; struct USBHostDevice *s; /* Ignore hubs */ if (class_id == 9) return 0; QTAILQ_FOREACH(s, &hostdevs, next) { f = &s->match; if (f->bus_num > 0 && f->bus_num != bus_num) { continue; } if (f->addr > 0 && f->addr != addr) { continue; } if (f->vendor_id > 0 && f->vendor_id != vendor_id) { continue; } if (f->product_id > 0 && f->product_id != product_id) { continue; } /* We got a match */ /* Already attached ? */ if (s->fd != -1) { return 0; } DPRINTF("husb: auto open: bus_num %d addr %d\n", bus_num, addr); usb_host_open(s, bus_num, addr, devpath, product_name); } return 0; } static void usb_host_auto_check(void *unused) { struct USBHostDevice *s; int unconnected = 0; usb_host_scan(NULL, usb_host_auto_scan); QTAILQ_FOREACH(s, &hostdevs, next) { if (s->fd == -1) { unconnected++; } } if (unconnected == 0) { /* nothing to watch */ if (usb_auto_timer) { qemu_del_timer(usb_auto_timer); } return; } if (!usb_auto_timer) { usb_auto_timer = qemu_new_timer_ms(rt_clock, usb_host_auto_check, NULL); if (!usb_auto_timer) { return; } } qemu_mod_timer(usb_auto_timer, qemu_get_clock_ms(rt_clock) + 2000); } /* * Autoconnect filter * Format: * auto:bus:dev[:vid:pid] * auto:bus.dev[:vid:pid] * * bus - bus number (dec, * means any) * dev - device number (dec, * means any) * vid - vendor id (hex, * means any) * pid - product id (hex, * means any) * * See 'lsusb' output. */ static int parse_filter(const char *spec, struct USBAutoFilter *f) { enum { BUS, DEV, VID, PID, DONE }; const char *p = spec; int i; f->bus_num = 0; f->addr = 0; f->vendor_id = 0; f->product_id = 0; for (i = BUS; i < DONE; i++) { p = strpbrk(p, ":."); if (!p) { break; } p++; if (*p == '*') { continue; } switch(i) { case BUS: f->bus_num = strtol(p, NULL, 10); break; case DEV: f->addr = strtol(p, NULL, 10); break; case VID: f->vendor_id = strtol(p, NULL, 16); break; case PID: f->product_id = strtol(p, NULL, 16); break; } } if (i < DEV) { fprintf(stderr, "husb: invalid auto filter spec %s\n", spec); return -1; } return 0; } /**********************/ /* USB host device info */ struct usb_class_info { int class; const char *class_name; }; static const struct usb_class_info usb_class_info[] = { { USB_CLASS_AUDIO, "Audio"}, { USB_CLASS_COMM, "Communication"}, { USB_CLASS_HID, "HID"}, { USB_CLASS_HUB, "Hub" }, { USB_CLASS_PHYSICAL, "Physical" }, { USB_CLASS_PRINTER, "Printer" }, { USB_CLASS_MASS_STORAGE, "Storage" }, { USB_CLASS_CDC_DATA, "Data" }, { USB_CLASS_APP_SPEC, "Application Specific" }, { USB_CLASS_VENDOR_SPEC, "Vendor Specific" }, { USB_CLASS_STILL_IMAGE, "Still Image" }, { USB_CLASS_CSCID, "Smart Card" }, { USB_CLASS_CONTENT_SEC, "Content Security" }, { -1, NULL } }; static const char *usb_class_str(uint8_t class) { const struct usb_class_info *p; for(p = usb_class_info; p->class != -1; p++) { if (p->class == class) { break; } } return p->class_name; } static void usb_info_device(Monitor *mon, int bus_num, int addr, int class_id, int vendor_id, int product_id, const char *product_name, int speed) { const char *class_str, *speed_str; switch(speed) { case USB_SPEED_LOW: speed_str = "1.5"; break; case USB_SPEED_FULL: speed_str = "12"; break; case USB_SPEED_HIGH: speed_str = "480"; break; default: speed_str = "?"; break; } monitor_printf(mon, " Device %d.%d, speed %s Mb/s\n", bus_num, addr, speed_str); class_str = usb_class_str(class_id); if (class_str) { monitor_printf(mon, " %s:", class_str); } else { monitor_printf(mon, " Class %02x:", class_id); } monitor_printf(mon, " USB device %04x:%04x", vendor_id, product_id); if (product_name[0] != '\0') { monitor_printf(mon, ", %s", product_name); } monitor_printf(mon, "\n"); } static int usb_host_info_device(void *opaque, int bus_num, int addr, int devpath, int class_id, int vendor_id, int product_id, const char *product_name, int speed) { Monitor *mon = opaque; usb_info_device(mon, bus_num, addr, class_id, vendor_id, product_id, product_name, speed); return 0; } static void dec2str(int val, char *str, size_t size) { if (val == 0) { snprintf(str, size, "*"); } else { snprintf(str, size, "%d", val); } } static void hex2str(int val, char *str, size_t size) { if (val == 0) { snprintf(str, size, "*"); } else { snprintf(str, size, "%04x", val); } } void usb_host_info(Monitor *mon) { struct USBAutoFilter *f; struct USBHostDevice *s; usb_host_scan(mon, usb_host_info_device); if (QTAILQ_EMPTY(&hostdevs)) { return; } monitor_printf(mon, " Auto filters:\n"); QTAILQ_FOREACH(s, &hostdevs, next) { char bus[10], addr[10], vid[10], pid[10]; f = &s->match; dec2str(f->bus_num, bus, sizeof(bus)); dec2str(f->addr, addr, sizeof(addr)); hex2str(f->vendor_id, vid, sizeof(vid)); hex2str(f->product_id, pid, sizeof(pid)); monitor_printf(mon, " Device %s.%s ID %s:%s\n", bus, addr, vid, pid); } }