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qcow2: Fix broken snapshot table entries
[qemu.git] / hw / usb / dev-serial.c
blob45cc74128ac923ab842c362132eb42c77b6cee0d
1 /*
2 * FTDI FT232BM Device emulation
3 *
4 * Copyright (c) 2006 CodeSourcery.
5 * Copyright (c) 2008 Samuel Thibault <samuel.thibault@ens-lyon.org>
6 * Written by Paul Brook, reused for FTDI by Samuel Thibault
7 *
8 * This code is licensed under the LGPL.
9 */
10
11 #include "qemu/osdep.h"
12 #include "qapi/error.h"
13 #include "qemu/cutils.h"
14 #include "qemu/error-report.h"
15 #include "qemu/module.h"
16 #include "hw/qdev-properties.h"
17 #include "hw/usb.h"
18 #include "migration/vmstate.h"
19 #include "desc.h"
20 #include "chardev/char-serial.h"
21 #include "chardev/char-fe.h"
22
23 //#define DEBUG_Serial
24
25 #ifdef DEBUG_Serial
26 #define DPRINTF(fmt, ...) \
27 do { printf("usb-serial: " fmt , ## __VA_ARGS__); } while (0)
28 #else
29 #define DPRINTF(fmt, ...) do {} while(0)
30 #endif
31
32 #define RECV_BUF 384
33
34 /* Commands */
35 #define FTDI_RESET 0
36 #define FTDI_SET_MDM_CTRL 1
37 #define FTDI_SET_FLOW_CTRL 2
38 #define FTDI_SET_BAUD 3
39 #define FTDI_SET_DATA 4
40 #define FTDI_GET_MDM_ST 5
41 #define FTDI_SET_EVENT_CHR 6
42 #define FTDI_SET_ERROR_CHR 7
43 #define FTDI_SET_LATENCY 9
44 #define FTDI_GET_LATENCY 10
45
46 #define DeviceOutVendor ((USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_DEVICE)<<8)
47 #define DeviceInVendor ((USB_DIR_IN |USB_TYPE_VENDOR|USB_RECIP_DEVICE)<<8)
48
49 /* RESET */
50
51 #define FTDI_RESET_SIO 0
52 #define FTDI_RESET_RX 1
53 #define FTDI_RESET_TX 2
54
55 /* SET_MDM_CTRL */
56
57 #define FTDI_DTR 1
58 #define FTDI_SET_DTR (FTDI_DTR << 8)
59 #define FTDI_RTS 2
60 #define FTDI_SET_RTS (FTDI_RTS << 8)
61
62 /* SET_FLOW_CTRL */
63
64 #define FTDI_RTS_CTS_HS 1
65 #define FTDI_DTR_DSR_HS 2
66 #define FTDI_XON_XOFF_HS 4
67
68 /* SET_DATA */
69
70 #define FTDI_PARITY (0x7 << 8)
71 #define FTDI_ODD (0x1 << 8)
72 #define FTDI_EVEN (0x2 << 8)
73 #define FTDI_MARK (0x3 << 8)
74 #define FTDI_SPACE (0x4 << 8)
75
76 #define FTDI_STOP (0x3 << 11)
77 #define FTDI_STOP1 (0x0 << 11)
78 #define FTDI_STOP15 (0x1 << 11)
79 #define FTDI_STOP2 (0x2 << 11)
80
81 /* GET_MDM_ST */
82 /* TODO: should be sent every 40ms */
83 #define FTDI_CTS (1<<4) // CTS line status
84 #define FTDI_DSR (1<<5) // DSR line status
85 #define FTDI_RI (1<<6) // RI line status
86 #define FTDI_RLSD (1<<7) // Receive Line Signal Detect
87
88 /* Status */
89
90 #define FTDI_DR (1<<0) // Data Ready
91 #define FTDI_OE (1<<1) // Overrun Err
92 #define FTDI_PE (1<<2) // Parity Err
93 #define FTDI_FE (1<<3) // Framing Err
94 #define FTDI_BI (1<<4) // Break Interrupt
95 #define FTDI_THRE (1<<5) // Transmitter Holding Register
96 #define FTDI_TEMT (1<<6) // Transmitter Empty
97 #define FTDI_FIFO (1<<7) // Error in FIFO
98
99 typedef struct {
100 USBDevice dev;
101 uint8_t recv_buf[RECV_BUF];
102 uint16_t recv_ptr;
103 uint16_t recv_used;
104 uint8_t event_chr;
105 uint8_t error_chr;
106 uint8_t event_trigger;
107 QEMUSerialSetParams params;
108 int latency; /* ms */
109 CharBackend cs;
110 } USBSerialState;
111
112 #define TYPE_USB_SERIAL "usb-serial-dev"
113 #define USB_SERIAL_DEV(obj) OBJECT_CHECK(USBSerialState, (obj), TYPE_USB_SERIAL)
114
115 enum {
116 STR_MANUFACTURER = 1,
117 STR_PRODUCT_SERIAL,
118 STR_PRODUCT_BRAILLE,
119 STR_SERIALNUMBER,
120 };
121
122 static const USBDescStrings desc_strings = {
123 [STR_MANUFACTURER] = "QEMU",
124 [STR_PRODUCT_SERIAL] = "QEMU USB SERIAL",
125 [STR_PRODUCT_BRAILLE] = "QEMU USB BAUM BRAILLE",
126 [STR_SERIALNUMBER] = "1",
127 };
128
129 static const USBDescIface desc_iface0 = {
130 .bInterfaceNumber = 0,
131 .bNumEndpoints = 2,
132 .bInterfaceClass = 0xff,
133 .bInterfaceSubClass = 0xff,
134 .bInterfaceProtocol = 0xff,
135 .eps = (USBDescEndpoint[]) {
136 {
137 .bEndpointAddress = USB_DIR_IN | 0x01,
138 .bmAttributes = USB_ENDPOINT_XFER_BULK,
139 .wMaxPacketSize = 64,
140 },{
141 .bEndpointAddress = USB_DIR_OUT | 0x02,
142 .bmAttributes = USB_ENDPOINT_XFER_BULK,
143 .wMaxPacketSize = 64,
144 },
145 }
146 };
147
148 static const USBDescDevice desc_device = {
149 .bcdUSB = 0x0200,
150 .bMaxPacketSize0 = 8,
151 .bNumConfigurations = 1,
152 .confs = (USBDescConfig[]) {
153 {
154 .bNumInterfaces = 1,
155 .bConfigurationValue = 1,
156 .bmAttributes = USB_CFG_ATT_ONE,
157 .bMaxPower = 50,
158 .nif = 1,
159 .ifs = &desc_iface0,
160 },
161 },
162 };
163
164 static const USBDesc desc_serial = {
165 .id = {
166 .idVendor = 0x0403,
167 .idProduct = 0x6001,
168 .bcdDevice = 0x0400,
169 .iManufacturer = STR_MANUFACTURER,
170 .iProduct = STR_PRODUCT_SERIAL,
171 .iSerialNumber = STR_SERIALNUMBER,
172 },
173 .full = &desc_device,
174 .str = desc_strings,
175 };
176
177 static const USBDesc desc_braille = {
178 .id = {
179 .idVendor = 0x0403,
180 .idProduct = 0xfe72,
181 .bcdDevice = 0x0400,
182 .iManufacturer = STR_MANUFACTURER,
183 .iProduct = STR_PRODUCT_BRAILLE,
184 .iSerialNumber = STR_SERIALNUMBER,
185 },
186 .full = &desc_device,
187 .str = desc_strings,
188 };
189
190 static void usb_serial_reset(USBSerialState *s)
191 {
192 /* TODO: Set flow control to none */
193 s->event_chr = 0x0d;
194 s->event_trigger = 0;
195 s->recv_ptr = 0;
196 s->recv_used = 0;
197 /* TODO: purge in char driver */
198 }
199
200 static void usb_serial_handle_reset(USBDevice *dev)
201 {
202 USBSerialState *s = (USBSerialState *)dev;
203
204 DPRINTF("Reset\n");
205
206 usb_serial_reset(s);
207 /* TODO: Reset char device, send BREAK? */
208 }
209
210 static uint8_t usb_get_modem_lines(USBSerialState *s)
211 {
212 int flags;
213 uint8_t ret;
214
215 if (qemu_chr_fe_ioctl(&s->cs,
216 CHR_IOCTL_SERIAL_GET_TIOCM, &flags) == -ENOTSUP) {
217 return FTDI_CTS|FTDI_DSR|FTDI_RLSD;
218 }
219
220 ret = 0;
221 if (flags & CHR_TIOCM_CTS)
222 ret |= FTDI_CTS;
223 if (flags & CHR_TIOCM_DSR)
224 ret |= FTDI_DSR;
225 if (flags & CHR_TIOCM_RI)
226 ret |= FTDI_RI;
227 if (flags & CHR_TIOCM_CAR)
228 ret |= FTDI_RLSD;
229
230 return ret;
231 }
232
233 static void usb_serial_handle_control(USBDevice *dev, USBPacket *p,
234 int request, int value, int index, int length, uint8_t *data)
235 {
236 USBSerialState *s = (USBSerialState *)dev;
237 int ret;
238
239 DPRINTF("got control %x, value %x\n",request, value);
240 ret = usb_desc_handle_control(dev, p, request, value, index, length, data);
241 if (ret >= 0) {
242 return;
243 }
244
245 switch (request) {
246 case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
247 break;
248
249 /* Class specific requests. */
250 case DeviceOutVendor | FTDI_RESET:
251 switch (value) {
252 case FTDI_RESET_SIO:
253 usb_serial_reset(s);
254 break;
255 case FTDI_RESET_RX:
256 s->recv_ptr = 0;
257 s->recv_used = 0;
258 /* TODO: purge from char device */
259 break;
260 case FTDI_RESET_TX:
261 /* TODO: purge from char device */
262 break;
263 }
264 break;
265 case DeviceOutVendor | FTDI_SET_MDM_CTRL:
266 {
267 static int flags;
268 qemu_chr_fe_ioctl(&s->cs, CHR_IOCTL_SERIAL_GET_TIOCM, &flags);
269 if (value & FTDI_SET_RTS) {
270 if (value & FTDI_RTS)
271 flags |= CHR_TIOCM_RTS;
272 else
273 flags &= ~CHR_TIOCM_RTS;
274 }
275 if (value & FTDI_SET_DTR) {
276 if (value & FTDI_DTR)
277 flags |= CHR_TIOCM_DTR;
278 else
279 flags &= ~CHR_TIOCM_DTR;
280 }
281 qemu_chr_fe_ioctl(&s->cs, CHR_IOCTL_SERIAL_SET_TIOCM, &flags);
282 break;
283 }
284 case DeviceOutVendor | FTDI_SET_FLOW_CTRL:
285 /* TODO: ioctl */
286 break;
287 case DeviceOutVendor | FTDI_SET_BAUD: {
288 static const int subdivisors8[8] = { 0, 4, 2, 1, 3, 5, 6, 7 };
289 int subdivisor8 = subdivisors8[((value & 0xc000) >> 14)
290 | ((index & 1) << 2)];
291 int divisor = value & 0x3fff;
292
293 /* chip special cases */
294 if (divisor == 1 && subdivisor8 == 0)
295 subdivisor8 = 4;
296 if (divisor == 0 && subdivisor8 == 0)
297 divisor = 1;
298
299 s->params.speed = (48000000 / 2) / (8 * divisor + subdivisor8);
300 qemu_chr_fe_ioctl(&s->cs, CHR_IOCTL_SERIAL_SET_PARAMS, &s->params);
301 break;
302 }
303 case DeviceOutVendor | FTDI_SET_DATA:
304 switch (value & FTDI_PARITY) {
305 case 0:
306 s->params.parity = 'N';
307 break;
308 case FTDI_ODD:
309 s->params.parity = 'O';
310 break;
311 case FTDI_EVEN:
312 s->params.parity = 'E';
313 break;
314 default:
315 DPRINTF("unsupported parity %d\n", value & FTDI_PARITY);
316 goto fail;
317 }
318 switch (value & FTDI_STOP) {
319 case FTDI_STOP1:
320 s->params.stop_bits = 1;
321 break;
322 case FTDI_STOP2:
323 s->params.stop_bits = 2;
324 break;
325 default:
326 DPRINTF("unsupported stop bits %d\n", value & FTDI_STOP);
327 goto fail;
328 }
329 qemu_chr_fe_ioctl(&s->cs, CHR_IOCTL_SERIAL_SET_PARAMS, &s->params);
330 /* TODO: TX ON/OFF */
331 break;
332 case DeviceInVendor | FTDI_GET_MDM_ST:
333 data[0] = usb_get_modem_lines(s) | 1;
334 data[1] = 0;
335 p->actual_length = 2;
336 break;
337 case DeviceOutVendor | FTDI_SET_EVENT_CHR:
338 /* TODO: handle it */
339 s->event_chr = value;
340 break;
341 case DeviceOutVendor | FTDI_SET_ERROR_CHR:
342 /* TODO: handle it */
343 s->error_chr = value;
344 break;
345 case DeviceOutVendor | FTDI_SET_LATENCY:
346 s->latency = value;
347 break;
348 case DeviceInVendor | FTDI_GET_LATENCY:
349 data[0] = s->latency;
350 p->actual_length = 1;
351 break;
352 default:
353 fail:
354 DPRINTF("got unsupported/bogus control %x, value %x\n", request, value);
355 p->status = USB_RET_STALL;
356 break;
357 }
358 }
359
360 static void usb_serial_handle_data(USBDevice *dev, USBPacket *p)
361 {
362 USBSerialState *s = (USBSerialState *)dev;
363 uint8_t devep = p->ep->nr;
364 struct iovec *iov;
365 uint8_t header[2];
366 int i, first_len, len;
367
368 switch (p->pid) {
369 case USB_TOKEN_OUT:
370 if (devep != 2)
371 goto fail;
372 for (i = 0; i < p->iov.niov; i++) {
373 iov = p->iov.iov + i;
374 /* XXX this blocks entire thread. Rewrite to use
375 * qemu_chr_fe_write and background I/O callbacks */
376 qemu_chr_fe_write_all(&s->cs, iov->iov_base, iov->iov_len);
377 }
378 p->actual_length = p->iov.size;
379 break;
380
381 case USB_TOKEN_IN:
382 if (devep != 1)
383 goto fail;
384 first_len = RECV_BUF - s->recv_ptr;
385 len = p->iov.size;
386 if (len <= 2) {
387 p->status = USB_RET_NAK;
388 break;
389 }
390 header[0] = usb_get_modem_lines(s) | 1;
391 /* We do not have the uart details */
392 /* handle serial break */
393 if (s->event_trigger && s->event_trigger & FTDI_BI) {
394 s->event_trigger &= ~FTDI_BI;
395 header[1] = FTDI_BI;
396 usb_packet_copy(p, header, 2);
397 break;
398 } else {
399 header[1] = 0;
400 }
401 len -= 2;
402 if (len > s->recv_used)
403 len = s->recv_used;
404 if (!len) {
405 p->status = USB_RET_NAK;
406 break;
407 }
408 if (first_len > len)
409 first_len = len;
410 usb_packet_copy(p, header, 2);
411 usb_packet_copy(p, s->recv_buf + s->recv_ptr, first_len);
412 if (len > first_len)
413 usb_packet_copy(p, s->recv_buf, len - first_len);
414 s->recv_used -= len;
415 s->recv_ptr = (s->recv_ptr + len) % RECV_BUF;
416 break;
417
418 default:
419 DPRINTF("Bad token\n");
420 fail:
421 p->status = USB_RET_STALL;
422 break;
423 }
424 }
425
426 static int usb_serial_can_read(void *opaque)
427 {
428 USBSerialState *s = opaque;
429
430 if (!s->dev.attached) {
431 return 0;
432 }
433 return RECV_BUF - s->recv_used;
434 }
435
436 static void usb_serial_read(void *opaque, const uint8_t *buf, int size)
437 {
438 USBSerialState *s = opaque;
439 int first_size, start;
440
441 /* room in the buffer? */
442 if (size > (RECV_BUF - s->recv_used))
443 size = RECV_BUF - s->recv_used;
444
445 start = s->recv_ptr + s->recv_used;
446 if (start < RECV_BUF) {
447 /* copy data to end of buffer */
448 first_size = RECV_BUF - start;
449 if (first_size > size)
450 first_size = size;
451
452 memcpy(s->recv_buf + start, buf, first_size);
453
454 /* wrap around to front if needed */
455 if (size > first_size)
456 memcpy(s->recv_buf, buf + first_size, size - first_size);
457 } else {
458 start -= RECV_BUF;
459 memcpy(s->recv_buf + start, buf, size);
460 }
461 s->recv_used += size;
462 }
463
464 static void usb_serial_event(void *opaque, int event)
465 {
466 USBSerialState *s = opaque;
467
468 switch (event) {
469 case CHR_EVENT_BREAK:
470 s->event_trigger |= FTDI_BI;
471 break;
472 case CHR_EVENT_OPENED:
473 if (!s->dev.attached) {
474 usb_device_attach(&s->dev, &error_abort);
475 }
476 break;
477 case CHR_EVENT_CLOSED:
478 if (s->dev.attached) {
479 usb_device_detach(&s->dev);
480 }
481 break;
482 }
483 }
484
485 static void usb_serial_realize(USBDevice *dev, Error **errp)
486 {
487 USBSerialState *s = USB_SERIAL_DEV(dev);
488 Error *local_err = NULL;
489
490 usb_desc_create_serial(dev);
491 usb_desc_init(dev);
492 dev->auto_attach = 0;
493
494 if (!qemu_chr_fe_backend_connected(&s->cs)) {
495 error_setg(errp, "Property chardev is required");
496 return;
497 }
498
499 usb_check_attach(dev, &local_err);
500 if (local_err) {
501 error_propagate(errp, local_err);
502 return;
503 }
504
505 qemu_chr_fe_set_handlers(&s->cs, usb_serial_can_read, usb_serial_read,
506 usb_serial_event, NULL, s, NULL, true);
507 usb_serial_handle_reset(dev);
508
509 if (qemu_chr_fe_backend_open(&s->cs) && !dev->attached) {
510 usb_device_attach(dev, &error_abort);
511 }
512 }
513
514 static USBDevice *usb_braille_init(USBBus *bus, const char *unused)
515 {
516 USBDevice *dev;
517 Chardev *cdrv;
518
519 cdrv = qemu_chr_new("braille", "braille", NULL);
520 if (!cdrv)
521 return NULL;
522
523 dev = usb_create(bus, "usb-braille");
524 qdev_prop_set_chr(&dev->qdev, "chardev", cdrv);
525 return dev;
526 }
527
528 static const VMStateDescription vmstate_usb_serial = {
529 .name = "usb-serial",
530 .unmigratable = 1,
531 };
532
533 static Property serial_properties[] = {
534 DEFINE_PROP_CHR("chardev", USBSerialState, cs),
535 DEFINE_PROP_END_OF_LIST(),
536 };
537
538 static void usb_serial_dev_class_init(ObjectClass *klass, void *data)
539 {
540 DeviceClass *dc = DEVICE_CLASS(klass);
541 USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
542
543 uc->realize = usb_serial_realize;
544 uc->handle_reset = usb_serial_handle_reset;
545 uc->handle_control = usb_serial_handle_control;
546 uc->handle_data = usb_serial_handle_data;
547 dc->vmsd = &vmstate_usb_serial;
548 set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
549 }
550
551 static const TypeInfo usb_serial_dev_type_info = {
552 .name = TYPE_USB_SERIAL,
553 .parent = TYPE_USB_DEVICE,
554 .instance_size = sizeof(USBSerialState),
555 .abstract = true,
556 .class_init = usb_serial_dev_class_init,
557 };
558
559 static void usb_serial_class_initfn(ObjectClass *klass, void *data)
560 {
561 DeviceClass *dc = DEVICE_CLASS(klass);
562 USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
563
564 uc->product_desc = "QEMU USB Serial";
565 uc->usb_desc = &desc_serial;
566 dc->props = serial_properties;
567 }
568
569 static const TypeInfo serial_info = {
570 .name = "usb-serial",
571 .parent = TYPE_USB_SERIAL,
572 .class_init = usb_serial_class_initfn,
573 };
574
575 static Property braille_properties[] = {
576 DEFINE_PROP_CHR("chardev", USBSerialState, cs),
577 DEFINE_PROP_END_OF_LIST(),
578 };
579
580 static void usb_braille_class_initfn(ObjectClass *klass, void *data)
581 {
582 DeviceClass *dc = DEVICE_CLASS(klass);
583 USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
584
585 uc->product_desc = "QEMU USB Braille";
586 uc->usb_desc = &desc_braille;
587 dc->props = braille_properties;
588 }
589
590 static const TypeInfo braille_info = {
591 .name = "usb-braille",
592 .parent = TYPE_USB_SERIAL,
593 .class_init = usb_braille_class_initfn,
594 };
595
596 static void usb_serial_register_types(void)
597 {
598 type_register_static(&usb_serial_dev_type_info);
599 type_register_static(&serial_info);
600 type_register_static(&braille_info);
601 usb_legacy_register("usb-braille", "braille", usb_braille_init);
602 }
603
604 type_init(usb_serial_register_types)
QEmu