2 * USB Mass Storage Device emulation
4 * Copyright (c) 2006 CodeSourcery.
5 * Written by Paul Brook
7 * This code is licenced under the LGPL.
10 #include "qemu-common.h"
13 #include "scsi-disk.h"
18 #define DPRINTF(fmt, args...) \
19 do { printf("usb-msd: " fmt , ##args); } while (0)
21 #define DPRINTF(fmt, args...) do {} while(0)
25 #define MassStorageReset 0xff
26 #define GetMaxLun 0xfe
29 USB_MSDM_CBW, /* Command Block. */
30 USB_MSDM_DATAOUT, /* Tranfer data to device. */
31 USB_MSDM_DATAIN, /* Transfer data from device. */
32 USB_MSDM_CSW /* Command Status. */
48 /* For async completion. */
69 static const uint8_t qemu_msd_dev_descriptor[] = {
70 0x12, /* u8 bLength; */
71 0x01, /* u8 bDescriptorType; Device */
72 0x00, 0x01, /* u16 bcdUSB; v1.0 */
74 0x00, /* u8 bDeviceClass; */
75 0x00, /* u8 bDeviceSubClass; */
76 0x00, /* u8 bDeviceProtocol; [ low/full speeds only ] */
77 0x08, /* u8 bMaxPacketSize0; 8 Bytes */
79 /* Vendor and product id are arbitrary. */
80 0x00, 0x00, /* u16 idVendor; */
81 0x00, 0x00, /* u16 idProduct; */
82 0x00, 0x00, /* u16 bcdDevice */
84 0x01, /* u8 iManufacturer; */
85 0x02, /* u8 iProduct; */
86 0x03, /* u8 iSerialNumber; */
87 0x01 /* u8 bNumConfigurations; */
90 static const uint8_t qemu_msd_config_descriptor[] = {
92 /* one configuration */
93 0x09, /* u8 bLength; */
94 0x02, /* u8 bDescriptorType; Configuration */
95 0x20, 0x00, /* u16 wTotalLength; */
96 0x01, /* u8 bNumInterfaces; (1) */
97 0x01, /* u8 bConfigurationValue; */
98 0x00, /* u8 iConfiguration; */
99 0xc0, /* u8 bmAttributes;
104 0x00, /* u8 MaxPower; */
107 0x09, /* u8 if_bLength; */
108 0x04, /* u8 if_bDescriptorType; Interface */
109 0x00, /* u8 if_bInterfaceNumber; */
110 0x00, /* u8 if_bAlternateSetting; */
111 0x02, /* u8 if_bNumEndpoints; */
112 0x08, /* u8 if_bInterfaceClass; MASS STORAGE */
113 0x06, /* u8 if_bInterfaceSubClass; SCSI */
114 0x50, /* u8 if_bInterfaceProtocol; Bulk Only */
115 0x00, /* u8 if_iInterface; */
117 /* Bulk-In endpoint */
118 0x07, /* u8 ep_bLength; */
119 0x05, /* u8 ep_bDescriptorType; Endpoint */
120 0x81, /* u8 ep_bEndpointAddress; IN Endpoint 1 */
121 0x02, /* u8 ep_bmAttributes; Bulk */
122 0x40, 0x00, /* u16 ep_wMaxPacketSize; */
123 0x00, /* u8 ep_bInterval; */
125 /* Bulk-Out endpoint */
126 0x07, /* u8 ep_bLength; */
127 0x05, /* u8 ep_bDescriptorType; Endpoint */
128 0x02, /* u8 ep_bEndpointAddress; OUT Endpoint 2 */
129 0x02, /* u8 ep_bmAttributes; Bulk */
130 0x40, 0x00, /* u16 ep_wMaxPacketSize; */
131 0x00 /* u8 ep_bInterval; */
134 static void usb_msd_copy_data(MSDState *s)
138 if (len > s->scsi_len)
140 if (s->mode == USB_MSDM_DATAIN) {
141 memcpy(s->usb_buf, s->scsi_buf, len);
143 memcpy(s->scsi_buf, s->usb_buf, len);
150 if (s->scsi_len == 0) {
151 if (s->mode == USB_MSDM_DATAIN) {
152 s->scsi_dev->read_data(s->scsi_dev, s->tag);
153 } else if (s->mode == USB_MSDM_DATAOUT) {
154 s->scsi_dev->write_data(s->scsi_dev, s->tag);
159 static void usb_msd_send_status(MSDState *s)
161 struct usb_msd_csw csw;
163 csw.sig = cpu_to_le32(0x53425355);
164 csw.tag = cpu_to_le32(s->tag);
165 csw.residue = s->residue;
166 csw.status = s->result;
167 memcpy(s->usb_buf, &csw, 13);
170 static void usb_msd_command_complete(void *opaque, int reason, uint32_t tag,
173 MSDState *s = (MSDState *)opaque;
174 USBPacket *p = s->packet;
177 fprintf(stderr, "usb-msd: Unexpected SCSI Tag 0x%x\n", tag);
179 if (reason == SCSI_REASON_DONE) {
180 DPRINTF("Command complete %d\n", arg);
181 s->residue = s->data_len;
182 s->result = arg != 0;
184 if (s->data_len == 0 && s->mode == USB_MSDM_DATAOUT) {
185 /* A deferred packet with no write data remaining must be
186 the status read packet. */
187 usb_msd_send_status(s);
188 s->mode = USB_MSDM_CBW;
191 s->data_len -= s->usb_len;
192 if (s->mode == USB_MSDM_DATAIN)
193 memset(s->usb_buf, 0, s->usb_len);
196 if (s->data_len == 0)
197 s->mode = USB_MSDM_CSW;
200 usb_packet_complete(p);
201 } else if (s->data_len == 0) {
202 s->mode = USB_MSDM_CSW;
207 s->scsi_buf = s->scsi_dev->get_buf(s->scsi_dev, tag);
209 usb_msd_copy_data(s);
210 if (s->usb_len == 0) {
211 /* Set s->packet to NULL before calling usb_packet_complete
212 because annother request may be issued before
213 usb_packet_complete returns. */
214 DPRINTF("Packet complete %p\n", p);
216 usb_packet_complete(p);
221 static void usb_msd_handle_reset(USBDevice *dev)
223 MSDState *s = (MSDState *)dev;
226 s->mode = USB_MSDM_CBW;
229 static int usb_msd_handle_control(USBDevice *dev, int request, int value,
230 int index, int length, uint8_t *data)
232 MSDState *s = (MSDState *)dev;
236 case DeviceRequest | USB_REQ_GET_STATUS:
237 data[0] = (1 << USB_DEVICE_SELF_POWERED) |
238 (dev->remote_wakeup << USB_DEVICE_REMOTE_WAKEUP);
242 case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
243 if (value == USB_DEVICE_REMOTE_WAKEUP) {
244 dev->remote_wakeup = 0;
250 case DeviceOutRequest | USB_REQ_SET_FEATURE:
251 if (value == USB_DEVICE_REMOTE_WAKEUP) {
252 dev->remote_wakeup = 1;
258 case DeviceOutRequest | USB_REQ_SET_ADDRESS:
262 case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
265 memcpy(data, qemu_msd_dev_descriptor,
266 sizeof(qemu_msd_dev_descriptor));
267 ret = sizeof(qemu_msd_dev_descriptor);
270 memcpy(data, qemu_msd_config_descriptor,
271 sizeof(qemu_msd_config_descriptor));
272 ret = sizeof(qemu_msd_config_descriptor);
275 switch(value & 0xff) {
285 /* vendor description */
286 ret = set_usb_string(data, "QEMU " QEMU_VERSION);
289 /* product description */
290 ret = set_usb_string(data, "QEMU USB HARDDRIVE");
294 ret = set_usb_string(data, "1");
304 case DeviceRequest | USB_REQ_GET_CONFIGURATION:
308 case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
311 case DeviceRequest | USB_REQ_GET_INTERFACE:
315 case DeviceOutRequest | USB_REQ_SET_INTERFACE:
318 case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
319 if (value == 0 && index != 0x81) { /* clear ep halt */
324 /* Class specific requests. */
325 case MassStorageReset:
326 /* Reset state ready for the next CBW. */
327 s->mode = USB_MSDM_CBW;
342 static void usb_msd_cancel_io(USBPacket *p, void *opaque)
344 MSDState *s = opaque;
345 s->scsi_dev->cancel_io(s->scsi_dev, s->tag);
350 static int usb_msd_handle_data(USBDevice *dev, USBPacket *p)
352 MSDState *s = (MSDState *)dev;
354 struct usb_msd_cbw cbw;
355 uint8_t devep = p->devep;
356 uint8_t *data = p->data;
367 fprintf(stderr, "usb-msd: Bad CBW size");
370 memcpy(&cbw, data, 31);
371 if (le32_to_cpu(cbw.sig) != 0x43425355) {
372 fprintf(stderr, "usb-msd: Bad signature %08x\n",
373 le32_to_cpu(cbw.sig));
376 DPRINTF("Command on LUN %d\n", cbw.lun);
378 fprintf(stderr, "usb-msd: Bad LUN %d\n", cbw.lun);
381 s->tag = le32_to_cpu(cbw.tag);
382 s->data_len = le32_to_cpu(cbw.data_len);
383 if (s->data_len == 0) {
384 s->mode = USB_MSDM_CSW;
385 } else if (cbw.flags & 0x80) {
386 s->mode = USB_MSDM_DATAIN;
388 s->mode = USB_MSDM_DATAOUT;
390 DPRINTF("Command tag 0x%x flags %08x len %d data %d\n",
391 s->tag, cbw.flags, cbw.cmd_len, s->data_len);
393 s->scsi_dev->send_command(s->scsi_dev, s->tag, cbw.cmd, 0);
394 /* ??? Should check that USB and SCSI data transfer
396 if (s->residue == 0) {
397 if (s->mode == USB_MSDM_DATAIN) {
398 s->scsi_dev->read_data(s->scsi_dev, s->tag);
399 } else if (s->mode == USB_MSDM_DATAOUT) {
400 s->scsi_dev->write_data(s->scsi_dev, s->tag);
406 case USB_MSDM_DATAOUT:
407 DPRINTF("Data out %d/%d\n", len, s->data_len);
408 if (len > s->data_len)
414 usb_msd_copy_data(s);
416 if (s->residue && s->usb_len) {
417 s->data_len -= s->usb_len;
418 if (s->data_len == 0)
419 s->mode = USB_MSDM_CSW;
423 DPRINTF("Deferring packet %p\n", p);
424 usb_defer_packet(p, usb_msd_cancel_io, s);
433 DPRINTF("Unexpected write (len %d)\n", len);
443 case USB_MSDM_DATAOUT:
444 if (s->data_len != 0 || len < 13)
446 /* Waiting for SCSI write to complete. */
447 usb_defer_packet(p, usb_msd_cancel_io, s);
453 DPRINTF("Command status %d tag 0x%x, len %d\n",
454 s->result, s->tag, len);
460 usb_msd_send_status(s);
461 s->mode = USB_MSDM_CBW;
465 case USB_MSDM_DATAIN:
466 DPRINTF("Data in %d/%d\n", len, s->data_len);
467 if (len > s->data_len)
472 usb_msd_copy_data(s);
474 if (s->residue && s->usb_len) {
475 s->data_len -= s->usb_len;
476 memset(s->usb_buf, 0, s->usb_len);
477 if (s->data_len == 0)
478 s->mode = USB_MSDM_CSW;
482 DPRINTF("Deferring packet %p\n", p);
483 usb_defer_packet(p, usb_msd_cancel_io, s);
492 DPRINTF("Unexpected read (len %d)\n", len);
498 DPRINTF("Bad token\n");
507 static void usb_msd_handle_destroy(USBDevice *dev)
509 MSDState *s = (MSDState *)dev;
511 s->scsi_dev->destroy(s->scsi_dev);
516 USBDevice *usb_msd_init(const char *filename)
519 BlockDriverState *bdrv;
521 s = qemu_mallocz(sizeof(MSDState));
525 bdrv = bdrv_new("usb");
526 if (bdrv_open(bdrv, filename, 0) < 0)
528 if (qemu_key_check(bdrv, filename))
532 s->dev.speed = USB_SPEED_FULL;
533 s->dev.handle_packet = usb_generic_handle_packet;
535 s->dev.handle_reset = usb_msd_handle_reset;
536 s->dev.handle_control = usb_msd_handle_control;
537 s->dev.handle_data = usb_msd_handle_data;
538 s->dev.handle_destroy = usb_msd_handle_destroy;
540 snprintf(s->dev.devname, sizeof(s->dev.devname), "QEMU USB MSD(%.16s)",
543 s->scsi_dev = scsi_disk_init(bdrv, 0, usb_msd_command_complete, s);
544 usb_msd_handle_reset((USBDevice *)s);
545 return (USBDevice *)s;