root / hw / usb-msd.c @ c5bf71a9
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/*
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* USB Mass Storage Device emulation
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*
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* Copyright (c) 2006 CodeSourcery.
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* Written by Paul Brook
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*
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* This code is licenced under the LGPL.
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*/
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#include "qemu-common.h" |
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#include "qemu-option.h" |
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#include "qemu-config.h" |
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#include "usb.h" |
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#include "usb-desc.h" |
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#include "scsi.h" |
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#include "console.h" |
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#include "monitor.h" |
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#include "sysemu.h" |
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#include "blockdev.h" |
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//#define DEBUG_MSD
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|
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#ifdef DEBUG_MSD
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#define DPRINTF(fmt, ...) \
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do { printf("usb-msd: " fmt , ## __VA_ARGS__); } while (0) |
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#else
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#define DPRINTF(fmt, ...) do {} while(0) |
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#endif
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|
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/* USB requests. */
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#define MassStorageReset 0xff |
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#define GetMaxLun 0xfe |
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enum USBMSDMode {
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USB_MSDM_CBW, /* Command Block. */
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USB_MSDM_DATAOUT, /* Transfer data to device. */
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USB_MSDM_DATAIN, /* Transfer data from device. */
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USB_MSDM_CSW /* Command Status. */
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}; |
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typedef struct { |
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USBDevice dev; |
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enum USBMSDMode mode;
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uint32_t scsi_len; |
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uint8_t *scsi_buf; |
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uint32_t usb_len; |
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uint8_t *usb_buf; |
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uint32_t data_len; |
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uint32_t residue; |
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uint32_t tag; |
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SCSIRequest *req; |
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SCSIBus bus; |
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BlockConf conf; |
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char *serial;
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SCSIDevice *scsi_dev; |
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uint32_t removable; |
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int result;
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/* For async completion. */
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USBPacket *packet; |
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} MSDState; |
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|
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struct usb_msd_cbw {
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uint32_t sig; |
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uint32_t tag; |
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uint32_t data_len; |
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uint8_t flags; |
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uint8_t lun; |
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uint8_t cmd_len; |
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uint8_t cmd[16];
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}; |
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|
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struct usb_msd_csw {
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uint32_t sig; |
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uint32_t tag; |
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uint32_t residue; |
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uint8_t status; |
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}; |
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enum {
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STR_MANUFACTURER = 1,
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STR_PRODUCT, |
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STR_SERIALNUMBER, |
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STR_CONFIG_FULL, |
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STR_CONFIG_HIGH, |
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}; |
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|
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static const USBDescStrings desc_strings = { |
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[STR_MANUFACTURER] = "QEMU " QEMU_VERSION,
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[STR_PRODUCT] = "QEMU USB HARDDRIVE",
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[STR_SERIALNUMBER] = "1",
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[STR_CONFIG_FULL] = "Full speed config (usb 1.1)",
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[STR_CONFIG_HIGH] = "High speed config (usb 2.0)",
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}; |
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|
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static const USBDescIface desc_iface_full = { |
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.bInterfaceNumber = 0,
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.bNumEndpoints = 2,
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.bInterfaceClass = USB_CLASS_MASS_STORAGE, |
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.bInterfaceSubClass = 0x06, /* SCSI */ |
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.bInterfaceProtocol = 0x50, /* Bulk */ |
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.eps = (USBDescEndpoint[]) { |
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{ |
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.bEndpointAddress = USB_DIR_IN | 0x01,
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.bmAttributes = USB_ENDPOINT_XFER_BULK, |
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.wMaxPacketSize = 64,
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},{ |
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.bEndpointAddress = USB_DIR_OUT | 0x02,
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.bmAttributes = USB_ENDPOINT_XFER_BULK, |
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.wMaxPacketSize = 64,
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}, |
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} |
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}; |
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|
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static const USBDescDevice desc_device_full = { |
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.bcdUSB = 0x0200,
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.bMaxPacketSize0 = 8,
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.bNumConfigurations = 1,
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.confs = (USBDescConfig[]) { |
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{ |
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.bNumInterfaces = 1,
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.bConfigurationValue = 1,
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.iConfiguration = STR_CONFIG_FULL, |
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.bmAttributes = 0xc0,
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.nif = 1,
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.ifs = &desc_iface_full, |
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}, |
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}, |
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}; |
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static const USBDescIface desc_iface_high = { |
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.bInterfaceNumber = 0,
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.bNumEndpoints = 2,
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.bInterfaceClass = USB_CLASS_MASS_STORAGE, |
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.bInterfaceSubClass = 0x06, /* SCSI */ |
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.bInterfaceProtocol = 0x50, /* Bulk */ |
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.eps = (USBDescEndpoint[]) { |
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{ |
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.bEndpointAddress = USB_DIR_IN | 0x01,
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.bmAttributes = USB_ENDPOINT_XFER_BULK, |
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.wMaxPacketSize = 512,
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},{ |
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.bEndpointAddress = USB_DIR_OUT | 0x02,
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.bmAttributes = USB_ENDPOINT_XFER_BULK, |
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.wMaxPacketSize = 512,
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}, |
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} |
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}; |
148 |
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static const USBDescDevice desc_device_high = { |
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.bcdUSB = 0x0200,
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.bMaxPacketSize0 = 64,
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.bNumConfigurations = 1,
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.confs = (USBDescConfig[]) { |
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{ |
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.bNumInterfaces = 1,
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.bConfigurationValue = 1,
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.iConfiguration = STR_CONFIG_HIGH, |
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.bmAttributes = 0xc0,
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.nif = 1,
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.ifs = &desc_iface_high, |
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}, |
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}, |
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}; |
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|
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static const USBDesc desc = { |
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.id = { |
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.idVendor = 0,
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.idProduct = 0,
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.bcdDevice = 0,
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.iManufacturer = STR_MANUFACTURER, |
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.iProduct = STR_PRODUCT, |
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.iSerialNumber = STR_SERIALNUMBER, |
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}, |
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.full = &desc_device_full, |
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.high = &desc_device_high, |
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.str = desc_strings, |
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}; |
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|
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static void usb_msd_copy_data(MSDState *s) |
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{ |
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uint32_t len; |
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len = s->usb_len; |
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if (len > s->scsi_len)
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len = s->scsi_len; |
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if (s->mode == USB_MSDM_DATAIN) {
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memcpy(s->usb_buf, s->scsi_buf, len); |
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} else {
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memcpy(s->scsi_buf, s->usb_buf, len); |
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} |
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s->usb_len -= len; |
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s->scsi_len -= len; |
192 |
s->usb_buf += len; |
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s->scsi_buf += len; |
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s->data_len -= len; |
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if (s->scsi_len == 0 || s->data_len == 0) { |
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scsi_req_continue(s->req); |
197 |
} |
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} |
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|
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static void usb_msd_send_status(MSDState *s, USBPacket *p) |
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{ |
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struct usb_msd_csw csw;
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int len;
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csw.sig = cpu_to_le32(0x53425355);
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csw.tag = cpu_to_le32(s->tag); |
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csw.residue = s->residue; |
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csw.status = s->result; |
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len = MIN(sizeof(csw), p->len);
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memcpy(p->data, &csw, len); |
212 |
} |
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static void usb_msd_transfer_data(SCSIRequest *req, uint32_t len) |
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{ |
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MSDState *s = DO_UPCAST(MSDState, dev.qdev, req->bus->qbus.parent); |
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USBPacket *p = s->packet; |
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assert((s->mode == USB_MSDM_DATAOUT) == (req->cmd.mode == SCSI_XFER_TO_DEV)); |
220 |
s->scsi_len = len; |
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s->scsi_buf = scsi_req_get_buf(req); |
222 |
if (p) {
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usb_msd_copy_data(s); |
224 |
if (s->packet && s->usb_len == 0) { |
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/* Set s->packet to NULL before calling usb_packet_complete
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because another request may be issued before
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usb_packet_complete returns. */
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DPRINTF("Packet complete %p\n", p);
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s->packet = NULL;
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usb_packet_complete(&s->dev, p); |
231 |
} |
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} |
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} |
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static void usb_msd_command_complete(SCSIRequest *req, uint32_t status) |
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{ |
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MSDState *s = DO_UPCAST(MSDState, dev.qdev, req->bus->qbus.parent); |
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USBPacket *p = s->packet; |
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DPRINTF("Command complete %d\n", status);
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s->residue = s->data_len; |
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s->result = status != 0;
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if (s->packet) {
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if (s->data_len == 0 && s->mode == USB_MSDM_DATAOUT) { |
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/* A deferred packet with no write data remaining must be
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the status read packet. */
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usb_msd_send_status(s, p); |
248 |
s->mode = USB_MSDM_CBW; |
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} else {
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if (s->data_len) {
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s->data_len -= s->usb_len; |
252 |
if (s->mode == USB_MSDM_DATAIN) {
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memset(s->usb_buf, 0, s->usb_len);
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} |
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s->usb_len = 0;
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} |
257 |
if (s->data_len == 0) { |
258 |
s->mode = USB_MSDM_CSW; |
259 |
} |
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} |
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s->packet = NULL;
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usb_packet_complete(&s->dev, p); |
263 |
} else if (s->data_len == 0) { |
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s->mode = USB_MSDM_CSW; |
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} |
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scsi_req_unref(req); |
267 |
s->req = NULL;
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} |
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|
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static void usb_msd_request_cancelled(SCSIRequest *req) |
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{ |
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MSDState *s = DO_UPCAST(MSDState, dev.qdev, req->bus->qbus.parent); |
273 |
|
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if (req == s->req) {
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scsi_req_unref(s->req); |
276 |
s->req = NULL;
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s->packet = NULL;
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s->scsi_len = 0;
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} |
280 |
} |
281 |
|
282 |
static void usb_msd_handle_reset(USBDevice *dev) |
283 |
{ |
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MSDState *s = (MSDState *)dev; |
285 |
|
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DPRINTF("Reset\n");
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s->mode = USB_MSDM_CBW; |
288 |
} |
289 |
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static int usb_msd_handle_control(USBDevice *dev, USBPacket *p, |
291 |
int request, int value, int index, int length, uint8_t *data) |
292 |
{ |
293 |
MSDState *s = (MSDState *)dev; |
294 |
int ret;
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295 |
|
296 |
ret = usb_desc_handle_control(dev, p, request, value, index, length, data); |
297 |
if (ret >= 0) { |
298 |
return ret;
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299 |
} |
300 |
|
301 |
ret = 0;
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302 |
switch (request) {
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303 |
case DeviceRequest | USB_REQ_GET_INTERFACE:
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304 |
data[0] = 0; |
305 |
ret = 1;
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306 |
break;
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307 |
case DeviceOutRequest | USB_REQ_SET_INTERFACE:
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308 |
ret = 0;
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309 |
break;
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310 |
case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
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311 |
ret = 0;
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312 |
break;
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313 |
case InterfaceOutRequest | USB_REQ_SET_INTERFACE:
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314 |
ret = 0;
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315 |
break;
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316 |
/* Class specific requests. */
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317 |
case ClassInterfaceOutRequest | MassStorageReset:
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318 |
/* Reset state ready for the next CBW. */
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s->mode = USB_MSDM_CBW; |
320 |
ret = 0;
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321 |
break;
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322 |
case ClassInterfaceRequest | GetMaxLun:
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323 |
data[0] = 0; |
324 |
ret = 1;
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325 |
break;
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326 |
default:
|
327 |
ret = USB_RET_STALL; |
328 |
break;
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329 |
} |
330 |
return ret;
|
331 |
} |
332 |
|
333 |
static void usb_msd_cancel_io(USBDevice *dev, USBPacket *p) |
334 |
{ |
335 |
MSDState *s = DO_UPCAST(MSDState, dev, dev); |
336 |
scsi_req_cancel(s->req); |
337 |
} |
338 |
|
339 |
static int usb_msd_handle_data(USBDevice *dev, USBPacket *p) |
340 |
{ |
341 |
MSDState *s = (MSDState *)dev; |
342 |
int ret = 0; |
343 |
struct usb_msd_cbw cbw;
|
344 |
uint8_t devep = p->devep; |
345 |
uint8_t *data = p->data; |
346 |
int len = p->len;
|
347 |
|
348 |
switch (p->pid) {
|
349 |
case USB_TOKEN_OUT:
|
350 |
if (devep != 2) |
351 |
goto fail;
|
352 |
|
353 |
switch (s->mode) {
|
354 |
case USB_MSDM_CBW:
|
355 |
if (len != 31) { |
356 |
fprintf(stderr, "usb-msd: Bad CBW size");
|
357 |
goto fail;
|
358 |
} |
359 |
memcpy(&cbw, data, 31);
|
360 |
if (le32_to_cpu(cbw.sig) != 0x43425355) { |
361 |
fprintf(stderr, "usb-msd: Bad signature %08x\n",
|
362 |
le32_to_cpu(cbw.sig)); |
363 |
goto fail;
|
364 |
} |
365 |
DPRINTF("Command on LUN %d\n", cbw.lun);
|
366 |
if (cbw.lun != 0) { |
367 |
fprintf(stderr, "usb-msd: Bad LUN %d\n", cbw.lun);
|
368 |
goto fail;
|
369 |
} |
370 |
s->tag = le32_to_cpu(cbw.tag); |
371 |
s->data_len = le32_to_cpu(cbw.data_len); |
372 |
if (s->data_len == 0) { |
373 |
s->mode = USB_MSDM_CSW; |
374 |
} else if (cbw.flags & 0x80) { |
375 |
s->mode = USB_MSDM_DATAIN; |
376 |
} else {
|
377 |
s->mode = USB_MSDM_DATAOUT; |
378 |
} |
379 |
DPRINTF("Command tag 0x%x flags %08x len %d data %d\n",
|
380 |
s->tag, cbw.flags, cbw.cmd_len, s->data_len); |
381 |
s->residue = 0;
|
382 |
s->scsi_len = 0;
|
383 |
s->req = scsi_req_new(s->scsi_dev, s->tag, 0, NULL); |
384 |
scsi_req_enqueue(s->req, cbw.cmd); |
385 |
/* ??? Should check that USB and SCSI data transfer
|
386 |
directions match. */
|
387 |
if (s->mode != USB_MSDM_CSW && s->residue == 0) { |
388 |
scsi_req_continue(s->req); |
389 |
} |
390 |
ret = len; |
391 |
break;
|
392 |
|
393 |
case USB_MSDM_DATAOUT:
|
394 |
DPRINTF("Data out %d/%d\n", len, s->data_len);
|
395 |
if (len > s->data_len)
|
396 |
goto fail;
|
397 |
|
398 |
s->usb_buf = data; |
399 |
s->usb_len = len; |
400 |
if (s->scsi_len) {
|
401 |
usb_msd_copy_data(s); |
402 |
} |
403 |
if (s->residue && s->usb_len) {
|
404 |
s->data_len -= s->usb_len; |
405 |
if (s->data_len == 0) |
406 |
s->mode = USB_MSDM_CSW; |
407 |
s->usb_len = 0;
|
408 |
} |
409 |
if (s->usb_len) {
|
410 |
DPRINTF("Deferring packet %p\n", p);
|
411 |
s->packet = p; |
412 |
ret = USB_RET_ASYNC; |
413 |
} else {
|
414 |
ret = len; |
415 |
} |
416 |
break;
|
417 |
|
418 |
default:
|
419 |
DPRINTF("Unexpected write (len %d)\n", len);
|
420 |
goto fail;
|
421 |
} |
422 |
break;
|
423 |
|
424 |
case USB_TOKEN_IN:
|
425 |
if (devep != 1) |
426 |
goto fail;
|
427 |
|
428 |
switch (s->mode) {
|
429 |
case USB_MSDM_DATAOUT:
|
430 |
if (s->data_len != 0 || len < 13) |
431 |
goto fail;
|
432 |
/* Waiting for SCSI write to complete. */
|
433 |
s->packet = p; |
434 |
ret = USB_RET_ASYNC; |
435 |
break;
|
436 |
|
437 |
case USB_MSDM_CSW:
|
438 |
DPRINTF("Command status %d tag 0x%x, len %d\n",
|
439 |
s->result, s->tag, len); |
440 |
if (len < 13) |
441 |
goto fail;
|
442 |
|
443 |
usb_msd_send_status(s, p); |
444 |
s->mode = USB_MSDM_CBW; |
445 |
ret = 13;
|
446 |
break;
|
447 |
|
448 |
case USB_MSDM_DATAIN:
|
449 |
DPRINTF("Data in %d/%d, scsi_len %d\n", len, s->data_len, s->scsi_len);
|
450 |
if (len > s->data_len)
|
451 |
len = s->data_len; |
452 |
s->usb_buf = data; |
453 |
s->usb_len = len; |
454 |
if (s->scsi_len) {
|
455 |
usb_msd_copy_data(s); |
456 |
} |
457 |
if (s->residue && s->usb_len) {
|
458 |
s->data_len -= s->usb_len; |
459 |
memset(s->usb_buf, 0, s->usb_len);
|
460 |
if (s->data_len == 0) |
461 |
s->mode = USB_MSDM_CSW; |
462 |
s->usb_len = 0;
|
463 |
} |
464 |
if (s->usb_len) {
|
465 |
DPRINTF("Deferring packet %p\n", p);
|
466 |
s->packet = p; |
467 |
ret = USB_RET_ASYNC; |
468 |
} else {
|
469 |
ret = len; |
470 |
} |
471 |
break;
|
472 |
|
473 |
default:
|
474 |
DPRINTF("Unexpected read (len %d)\n", len);
|
475 |
goto fail;
|
476 |
} |
477 |
break;
|
478 |
|
479 |
default:
|
480 |
DPRINTF("Bad token\n");
|
481 |
fail:
|
482 |
ret = USB_RET_STALL; |
483 |
break;
|
484 |
} |
485 |
|
486 |
return ret;
|
487 |
} |
488 |
|
489 |
static void usb_msd_password_cb(void *opaque, int err) |
490 |
{ |
491 |
MSDState *s = opaque; |
492 |
|
493 |
if (!err)
|
494 |
err = usb_device_attach(&s->dev); |
495 |
|
496 |
if (err)
|
497 |
qdev_unplug(&s->dev.qdev); |
498 |
} |
499 |
|
500 |
static const struct SCSIBusOps usb_msd_scsi_ops = { |
501 |
.transfer_data = usb_msd_transfer_data, |
502 |
.complete = usb_msd_command_complete, |
503 |
.cancel = usb_msd_request_cancelled |
504 |
}; |
505 |
|
506 |
static int usb_msd_initfn(USBDevice *dev) |
507 |
{ |
508 |
MSDState *s = DO_UPCAST(MSDState, dev, dev); |
509 |
BlockDriverState *bs = s->conf.bs; |
510 |
DriveInfo *dinfo; |
511 |
|
512 |
if (!bs) {
|
513 |
error_report("usb-msd: drive property not set");
|
514 |
return -1; |
515 |
} |
516 |
|
517 |
/*
|
518 |
* Hack alert: this pretends to be a block device, but it's really
|
519 |
* a SCSI bus that can serve only a single device, which it
|
520 |
* creates automatically. But first it needs to detach from its
|
521 |
* blockdev, or else scsi_bus_legacy_add_drive() dies when it
|
522 |
* attaches again.
|
523 |
*
|
524 |
* The hack is probably a bad idea.
|
525 |
*/
|
526 |
bdrv_detach(bs, &s->dev.qdev); |
527 |
s->conf.bs = NULL;
|
528 |
|
529 |
if (!s->serial) {
|
530 |
/* try to fall back to value set with legacy -drive serial=... */
|
531 |
dinfo = drive_get_by_blockdev(bs); |
532 |
if (*dinfo->serial) {
|
533 |
s->serial = strdup(dinfo->serial); |
534 |
} |
535 |
} |
536 |
if (s->serial) {
|
537 |
usb_desc_set_string(dev, STR_SERIALNUMBER, s->serial); |
538 |
} |
539 |
|
540 |
usb_desc_init(dev); |
541 |
scsi_bus_new(&s->bus, &s->dev.qdev, 0, 1, &usb_msd_scsi_ops); |
542 |
s->scsi_dev = scsi_bus_legacy_add_drive(&s->bus, bs, 0, !!s->removable);
|
543 |
if (!s->scsi_dev) {
|
544 |
return -1; |
545 |
} |
546 |
s->bus.qbus.allow_hotplug = 0;
|
547 |
usb_msd_handle_reset(dev); |
548 |
|
549 |
if (bdrv_key_required(bs)) {
|
550 |
if (cur_mon) {
|
551 |
monitor_read_bdrv_key_start(cur_mon, bs, usb_msd_password_cb, s); |
552 |
s->dev.auto_attach = 0;
|
553 |
} else {
|
554 |
autostart = 0;
|
555 |
} |
556 |
} |
557 |
|
558 |
add_boot_device_path(s->conf.bootindex, &dev->qdev, "/disk@0,0");
|
559 |
return 0; |
560 |
} |
561 |
|
562 |
static USBDevice *usb_msd_init(const char *filename) |
563 |
{ |
564 |
static int nr=0; |
565 |
char id[8]; |
566 |
QemuOpts *opts; |
567 |
DriveInfo *dinfo; |
568 |
USBDevice *dev; |
569 |
const char *p1; |
570 |
char fmt[32]; |
571 |
|
572 |
/* parse -usbdevice disk: syntax into drive opts */
|
573 |
snprintf(id, sizeof(id), "usb%d", nr++); |
574 |
opts = qemu_opts_create(qemu_find_opts("drive"), id, 0); |
575 |
|
576 |
p1 = strchr(filename, ':');
|
577 |
if (p1++) {
|
578 |
const char *p2; |
579 |
|
580 |
if (strstart(filename, "format=", &p2)) { |
581 |
int len = MIN(p1 - p2, sizeof(fmt)); |
582 |
pstrcpy(fmt, len, p2); |
583 |
qemu_opt_set(opts, "format", fmt);
|
584 |
} else if (*filename != ':') { |
585 |
printf("unrecognized USB mass-storage option %s\n", filename);
|
586 |
return NULL; |
587 |
} |
588 |
filename = p1; |
589 |
} |
590 |
if (!*filename) {
|
591 |
printf("block device specification needed\n");
|
592 |
return NULL; |
593 |
} |
594 |
qemu_opt_set(opts, "file", filename);
|
595 |
qemu_opt_set(opts, "if", "none"); |
596 |
|
597 |
/* create host drive */
|
598 |
dinfo = drive_init(opts, 0);
|
599 |
if (!dinfo) {
|
600 |
qemu_opts_del(opts); |
601 |
return NULL; |
602 |
} |
603 |
|
604 |
/* create guest device */
|
605 |
dev = usb_create(NULL /* FIXME */, "usb-storage"); |
606 |
if (!dev) {
|
607 |
return NULL; |
608 |
} |
609 |
if (qdev_prop_set_drive(&dev->qdev, "drive", dinfo->bdrv) < 0) { |
610 |
qdev_free(&dev->qdev); |
611 |
return NULL; |
612 |
} |
613 |
if (qdev_init(&dev->qdev) < 0) |
614 |
return NULL; |
615 |
|
616 |
return dev;
|
617 |
} |
618 |
|
619 |
static struct USBDeviceInfo msd_info = { |
620 |
.product_desc = "QEMU USB MSD",
|
621 |
.qdev.name = "usb-storage",
|
622 |
.qdev.fw_name = "storage",
|
623 |
.qdev.size = sizeof(MSDState),
|
624 |
.usb_desc = &desc, |
625 |
.init = usb_msd_initfn, |
626 |
.handle_packet = usb_generic_handle_packet, |
627 |
.cancel_packet = usb_msd_cancel_io, |
628 |
.handle_attach = usb_desc_attach, |
629 |
.handle_reset = usb_msd_handle_reset, |
630 |
.handle_control = usb_msd_handle_control, |
631 |
.handle_data = usb_msd_handle_data, |
632 |
.usbdevice_name = "disk",
|
633 |
.usbdevice_init = usb_msd_init, |
634 |
.qdev.props = (Property[]) { |
635 |
DEFINE_BLOCK_PROPERTIES(MSDState, conf), |
636 |
DEFINE_PROP_STRING("serial", MSDState, serial),
|
637 |
DEFINE_PROP_BIT("removable", MSDState, removable, 0, false), |
638 |
DEFINE_PROP_END_OF_LIST(), |
639 |
}, |
640 |
}; |
641 |
|
642 |
static void usb_msd_register_devices(void) |
643 |
{ |
644 |
usb_qdev_register(&msd_info); |
645 |
} |
646 |
device_init(usb_msd_register_devices) |