root / hw / usb-msd.c @ 059809e4
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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 "vl.h" |
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//#define DEBUG_MSD
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#ifdef DEBUG_MSD
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#define DPRINTF(fmt, args...) \
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do { printf("usb-msd: " fmt , ##args); } while (0) |
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#else
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#define DPRINTF(fmt, args...) 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, /* Tranfer 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 data_len; |
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uint32_t tag; |
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SCSIDevice *scsi_dev; |
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int result;
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} MSDState; |
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static const uint8_t qemu_msd_dev_descriptor[] = { |
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0x12, /* u8 bLength; */ |
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0x01, /* u8 bDescriptorType; Device */ |
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0x10, 0x00, /* u16 bcdUSB; v1.0 */ |
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|
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0x00, /* u8 bDeviceClass; */ |
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0x00, /* u8 bDeviceSubClass; */ |
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0x00, /* u8 bDeviceProtocol; [ low/full speeds only ] */ |
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0x08, /* u8 bMaxPacketSize0; 8 Bytes */ |
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/* Vendor and product id are arbitrary. */
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0x00, 0x00, /* u16 idVendor; */ |
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0x00, 0x00, /* u16 idProduct; */ |
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0x00, 0x00, /* u16 bcdDevice */ |
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|
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0x01, /* u8 iManufacturer; */ |
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0x02, /* u8 iProduct; */ |
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0x03, /* u8 iSerialNumber; */ |
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0x01 /* u8 bNumConfigurations; */ |
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}; |
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static const uint8_t qemu_msd_config_descriptor[] = { |
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/* one configuration */
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0x09, /* u8 bLength; */ |
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0x02, /* u8 bDescriptorType; Configuration */ |
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0x20, 0x00, /* u16 wTotalLength; */ |
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0x01, /* u8 bNumInterfaces; (1) */ |
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0x01, /* u8 bConfigurationValue; */ |
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0x00, /* u8 iConfiguration; */ |
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0xc0, /* u8 bmAttributes; |
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Bit 7: must be set,
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6: Self-powered,
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5: Remote wakeup,
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4..0: resvd */
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0x00, /* u8 MaxPower; */ |
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|
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/* one interface */
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0x09, /* u8 if_bLength; */ |
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0x04, /* u8 if_bDescriptorType; Interface */ |
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0x00, /* u8 if_bInterfaceNumber; */ |
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0x00, /* u8 if_bAlternateSetting; */ |
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0x02, /* u8 if_bNumEndpoints; */ |
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0x08, /* u8 if_bInterfaceClass; MASS STORAGE */ |
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0x06, /* u8 if_bInterfaceSubClass; SCSI */ |
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0x50, /* u8 if_bInterfaceProtocol; Bulk Only */ |
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0x00, /* u8 if_iInterface; */ |
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/* Bulk-In endpoint */
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0x07, /* u8 ep_bLength; */ |
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0x05, /* u8 ep_bDescriptorType; Endpoint */ |
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0x81, /* u8 ep_bEndpointAddress; IN Endpoint 1 */ |
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0x02, /* u8 ep_bmAttributes; Bulk */ |
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0x40, 0x00, /* u16 ep_wMaxPacketSize; */ |
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0x00, /* u8 ep_bInterval; */ |
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/* Bulk-Out endpoint */
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0x07, /* u8 ep_bLength; */ |
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0x05, /* u8 ep_bDescriptorType; Endpoint */ |
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0x02, /* u8 ep_bEndpointAddress; OUT Endpoint 2 */ |
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0x02, /* u8 ep_bmAttributes; Bulk */ |
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0x40, 0x00, /* u16 ep_wMaxPacketSize; */ |
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0x00 /* u8 ep_bInterval; */ |
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}; |
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static void usb_msd_command_complete(void *opaque, uint32_t tag, int fail) |
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{
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MSDState *s = (MSDState *)opaque; |
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DPRINTF("Command complete\n");
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s->result = fail; |
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s->mode = USB_MSDM_CSW; |
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} |
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static void usb_msd_handle_reset(USBDevice *dev) |
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{
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MSDState *s = (MSDState *)dev; |
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DPRINTF("Reset\n");
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s->mode = USB_MSDM_CBW; |
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} |
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static int usb_msd_handle_control(USBDevice *dev, int request, int value, |
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int index, int length, uint8_t *data) |
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{
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MSDState *s = (MSDState *)dev; |
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int ret = 0; |
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switch (request) {
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case DeviceRequest | USB_REQ_GET_STATUS:
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data[0] = (1 << USB_DEVICE_SELF_POWERED) | |
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(dev->remote_wakeup << USB_DEVICE_REMOTE_WAKEUP); |
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data[1] = 0x00; |
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ret = 2;
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break;
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case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
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if (value == USB_DEVICE_REMOTE_WAKEUP) {
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dev->remote_wakeup = 0;
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} else {
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goto fail;
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} |
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ret = 0;
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break;
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case DeviceOutRequest | USB_REQ_SET_FEATURE:
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if (value == USB_DEVICE_REMOTE_WAKEUP) {
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dev->remote_wakeup = 1;
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} else {
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goto fail;
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} |
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ret = 0;
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break;
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case DeviceOutRequest | USB_REQ_SET_ADDRESS:
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dev->addr = value; |
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ret = 0;
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break;
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case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
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switch(value >> 8) { |
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case USB_DT_DEVICE:
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memcpy(data, qemu_msd_dev_descriptor, |
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sizeof(qemu_msd_dev_descriptor));
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ret = sizeof(qemu_msd_dev_descriptor);
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break;
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case USB_DT_CONFIG:
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memcpy(data, qemu_msd_config_descriptor, |
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sizeof(qemu_msd_config_descriptor));
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ret = sizeof(qemu_msd_config_descriptor);
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break;
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case USB_DT_STRING:
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switch(value & 0xff) { |
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case 0: |
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/* language ids */
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data[0] = 4; |
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data[1] = 3; |
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data[2] = 0x09; |
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data[3] = 0x04; |
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ret = 4;
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break;
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case 1: |
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/* vendor description */
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ret = set_usb_string(data, "QEMU " QEMU_VERSION);
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break;
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case 2: |
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/* product description */
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ret = set_usb_string(data, "QEMU USB HARDDRIVE");
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break;
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case 3: |
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/* serial number */
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ret = set_usb_string(data, "1");
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break;
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default:
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goto fail;
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} |
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break;
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default:
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goto fail;
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} |
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break;
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case DeviceRequest | USB_REQ_GET_CONFIGURATION:
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data[0] = 1; |
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ret = 1;
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break;
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case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
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ret = 0;
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break;
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case DeviceRequest | USB_REQ_GET_INTERFACE:
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data[0] = 0; |
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ret = 1;
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break;
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case DeviceOutRequest | USB_REQ_SET_INTERFACE:
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ret = 0;
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break;
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case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
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if (value == 0 && index != 0x81) { /* clear ep halt */ |
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goto fail;
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} |
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ret = 0;
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break;
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/* Class specific requests. */
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case MassStorageReset:
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/* Reset state ready for the next CBW. */
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s->mode = USB_MSDM_CBW; |
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ret = 0;
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break;
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case GetMaxLun:
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data[0] = 0; |
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ret = 1;
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break;
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default:
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fail:
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ret = USB_RET_STALL; |
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break;
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} |
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return ret;
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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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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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static int usb_msd_handle_data(USBDevice *dev, int pid, uint8_t devep, |
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uint8_t *data, int len)
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{
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MSDState *s = (MSDState *)dev; |
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int ret = 0; |
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struct usb_msd_cbw cbw;
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struct usb_msd_csw csw;
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switch (pid) {
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case USB_TOKEN_OUT:
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if (devep != 2) |
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goto fail;
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switch (s->mode) {
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case USB_MSDM_CBW:
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if (len != 31) { |
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fprintf(stderr, "usb-msd: Bad CBW size");
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goto fail;
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} |
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memcpy(&cbw, data, 31);
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if (le32_to_cpu(cbw.sig) != 0x43425355) { |
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fprintf(stderr, "usb-msd: Bad signature %08x\n",
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le32_to_cpu(cbw.sig)); |
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goto fail;
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} |
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DPRINTF("Command on LUN %d\n", cbw.lun);
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if (cbw.lun != 0) { |
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fprintf(stderr, "usb-msd: Bad LUN %d\n", cbw.lun);
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goto fail;
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} |
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s->tag = le32_to_cpu(cbw.tag); |
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s->data_len = le32_to_cpu(cbw.data_len); |
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if (s->data_len == 0) { |
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s->mode = USB_MSDM_CSW; |
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} else if (cbw.flags & 0x80) { |
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s->mode = USB_MSDM_DATAIN; |
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} else {
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s->mode = USB_MSDM_DATAOUT; |
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} |
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DPRINTF("Command tag 0x%x flags %08x len %d data %d\n",
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s->tag, cbw.flags, cbw.cmd_len, s->data_len); |
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scsi_send_command(s->scsi_dev, s->tag, cbw.cmd, 0);
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ret = len; |
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break;
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case USB_MSDM_DATAOUT:
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DPRINTF("Data out %d/%d\n", len, s->data_len);
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if (len > s->data_len)
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goto fail;
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if (scsi_write_data(s->scsi_dev, data, len))
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goto fail;
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s->data_len -= len; |
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if (s->data_len == 0) |
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s->mode = USB_MSDM_CSW; |
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ret = len; |
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break;
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|
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default:
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DPRINTF("Unexpected write (len %d)\n", len);
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goto fail;
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} |
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break;
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|
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case USB_TOKEN_IN:
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if (devep != 1) |
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goto fail;
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|
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switch (s->mode) {
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case USB_MSDM_CSW:
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DPRINTF("Command status %d tag 0x%x, len %d\n",
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s->result, s->tag, len); |
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if (len < 13) |
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goto fail;
|
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|
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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 = 0;
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csw.status = s->result; |
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memcpy(data, &csw, 13);
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ret = 13;
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s->mode = USB_MSDM_CBW; |
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break;
|
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|
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case USB_MSDM_DATAIN:
|
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DPRINTF("Data in %d/%d\n", len, s->data_len);
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if (len > s->data_len)
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len = s->data_len; |
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|
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if (scsi_read_data(s->scsi_dev, data, len))
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goto fail;
|
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|
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s->data_len -= len; |
| 347 |
if (s->data_len == 0) |
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s->mode = USB_MSDM_CSW; |
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ret = len; |
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break;
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|
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default:
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DPRINTF("Unexpected read (len %d)\n", len);
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goto fail;
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} |
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break;
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|
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default:
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DPRINTF("Bad token\n");
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fail:
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ret = USB_RET_STALL; |
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break;
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} |
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return ret;
|
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} |
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|
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static void usb_msd_handle_destroy(USBDevice *dev) |
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{
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MSDState *s = (MSDState *)dev; |
| 371 |
|
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scsi_disk_destroy(s->scsi_dev); |
| 373 |
qemu_free(s); |
| 374 |
} |
| 375 |
|
| 376 |
USBDevice *usb_msd_init(const char *filename) |
| 377 |
{
|
| 378 |
MSDState *s; |
| 379 |
BlockDriverState *bdrv; |
| 380 |
|
| 381 |
s = qemu_mallocz(sizeof(MSDState));
|
| 382 |
if (!s)
|
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return NULL; |
| 384 |
|
| 385 |
bdrv = bdrv_new("usb");
|
| 386 |
bdrv_open(bdrv, filename, 0);
|
| 387 |
|
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s->dev.speed = USB_SPEED_FULL; |
| 389 |
s->dev.handle_packet = usb_generic_handle_packet; |
| 390 |
|
| 391 |
s->dev.handle_reset = usb_msd_handle_reset; |
| 392 |
s->dev.handle_control = usb_msd_handle_control; |
| 393 |
s->dev.handle_data = usb_msd_handle_data; |
| 394 |
s->dev.handle_destroy = usb_msd_handle_destroy; |
| 395 |
|
| 396 |
snprintf(s->dev.devname, sizeof(s->dev.devname), "QEMU USB MSD(%.16s)", |
| 397 |
filename); |
| 398 |
|
| 399 |
s->scsi_dev = scsi_disk_init(bdrv, usb_msd_command_complete, s); |
| 400 |
usb_msd_handle_reset((USBDevice *)s); |
| 401 |
return (USBDevice *)s;
|
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} |