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qemu-e2k/hw/usb/dev-serial.c

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/*
* FTDI FT232BM Device emulation
*
* Copyright (c) 2006 CodeSourcery.
* Copyright (c) 2008 Samuel Thibault <samuel.thibault@ens-lyon.org>
* Written by Paul Brook, reused for FTDI by Samuel Thibault
*
* This code is licensed under the LGPL.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu/cutils.h"
#include "qemu/error-report.h"
#include "qemu/module.h"
#include "hw/qdev-properties.h"
#include "hw/qdev-properties-system.h"
#include "hw/usb.h"
#include "migration/vmstate.h"
#include "desc.h"
#include "chardev/char-serial.h"
#include "chardev/char-fe.h"
#include "qom/object.h"
#include "trace.h"
#define RECV_BUF (512 - (2 * 8))
/* Commands */
#define FTDI_RESET 0
#define FTDI_SET_MDM_CTRL 1
#define FTDI_SET_FLOW_CTRL 2
#define FTDI_SET_BAUD 3
#define FTDI_SET_DATA 4
#define FTDI_GET_MDM_ST 5
#define FTDI_SET_EVENT_CHR 6
#define FTDI_SET_ERROR_CHR 7
#define FTDI_SET_LATENCY 9
#define FTDI_GET_LATENCY 10
/* RESET */
#define FTDI_RESET_SIO 0
#define FTDI_RESET_RX 1
#define FTDI_RESET_TX 2
/* SET_MDM_CTRL */
#define FTDI_DTR 1
#define FTDI_SET_DTR (FTDI_DTR << 8)
#define FTDI_RTS 2
#define FTDI_SET_RTS (FTDI_RTS << 8)
/* SET_FLOW_CTRL */
#define FTDI_NO_HS 0
#define FTDI_RTS_CTS_HS 1
#define FTDI_DTR_DSR_HS 2
#define FTDI_XON_XOFF_HS 4
/* SET_DATA */
#define FTDI_PARITY (0x7 << 8)
#define FTDI_ODD (0x1 << 8)
#define FTDI_EVEN (0x2 << 8)
#define FTDI_MARK (0x3 << 8)
#define FTDI_SPACE (0x4 << 8)
#define FTDI_STOP (0x3 << 11)
#define FTDI_STOP1 (0x0 << 11)
#define FTDI_STOP15 (0x1 << 11)
#define FTDI_STOP2 (0x2 << 11)
/* GET_MDM_ST */
/* TODO: should be sent every 40ms */
#define FTDI_CTS (1 << 4) /* CTS line status */
#define FTDI_DSR (1 << 5) /* DSR line status */
#define FTDI_RI (1 << 6) /* RI line status */
#define FTDI_RLSD (1 << 7) /* Receive Line Signal Detect */
/* Status */
#define FTDI_DR (1 << 0) /* Data Ready */
#define FTDI_OE (1 << 1) /* Overrun Err */
#define FTDI_PE (1 << 2) /* Parity Err */
#define FTDI_FE (1 << 3) /* Framing Err */
#define FTDI_BI (1 << 4) /* Break Interrupt */
#define FTDI_THRE (1 << 5) /* Transmitter Holding Register */
#define FTDI_TEMT (1 << 6) /* Transmitter Empty */
#define FTDI_FIFO (1 << 7) /* Error in FIFO */
struct USBSerialState {
USBDevice dev;
USBEndpoint *intr;
uint8_t recv_buf[RECV_BUF];
uint16_t recv_ptr;
uint16_t recv_used;
uint8_t event_chr;
uint8_t error_chr;
uint8_t event_trigger;
bool always_plugged;
uint8_t flow_control;
uint8_t xon;
uint8_t xoff;
QEMUSerialSetParams params;
int latency; /* ms */
CharBackend cs;
};
#define TYPE_USB_SERIAL "usb-serial-dev"
OBJECT_DECLARE_SIMPLE_TYPE(USBSerialState, USB_SERIAL)
enum {
STR_MANUFACTURER = 1,
STR_PRODUCT_SERIAL,
STR_PRODUCT_BRAILLE,
STR_SERIALNUMBER,
};
static const USBDescStrings desc_strings = {
[STR_MANUFACTURER] = "QEMU",
[STR_PRODUCT_SERIAL] = "QEMU USB SERIAL",
[STR_PRODUCT_BRAILLE] = "QEMU USB BAUM BRAILLE",
[STR_SERIALNUMBER] = "1",
};
static const USBDescIface desc_iface0 = {
.bInterfaceNumber = 0,
.bNumEndpoints = 2,
.bInterfaceClass = 0xff,
.bInterfaceSubClass = 0xff,
.bInterfaceProtocol = 0xff,
.eps = (USBDescEndpoint[]) {
{
.bEndpointAddress = USB_DIR_IN | 0x01,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = 64,
},{
.bEndpointAddress = USB_DIR_OUT | 0x02,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = 64,
},
}
};
static const USBDescDevice desc_device = {
.bcdUSB = 0x0200,
.bMaxPacketSize0 = 8,
.bNumConfigurations = 1,
.confs = (USBDescConfig[]) {
{
.bNumInterfaces = 1,
.bConfigurationValue = 1,
.bmAttributes = USB_CFG_ATT_ONE | USB_CFG_ATT_WAKEUP,
.bMaxPower = 50,
.nif = 1,
.ifs = &desc_iface0,
},
},
};
static const USBDesc desc_serial = {
.id = {
.idVendor = 0x0403,
.idProduct = 0x6001,
.bcdDevice = 0x0400,
.iManufacturer = STR_MANUFACTURER,
.iProduct = STR_PRODUCT_SERIAL,
.iSerialNumber = STR_SERIALNUMBER,
},
.full = &desc_device,
.str = desc_strings,
};
static const USBDesc desc_braille = {
.id = {
.idVendor = 0x0403,
.idProduct = 0xfe72,
.bcdDevice = 0x0400,
.iManufacturer = STR_MANUFACTURER,
.iProduct = STR_PRODUCT_BRAILLE,
.iSerialNumber = STR_SERIALNUMBER,
},
.full = &desc_device,
.str = desc_strings,
};
static void usb_serial_set_flow_control(USBSerialState *s,
uint8_t flow_control)
{
USBDevice *dev = USB_DEVICE(s);
USBBus *bus = usb_bus_from_device(dev);
/* TODO: ioctl */
s->flow_control = flow_control;
trace_usb_serial_set_flow_control(bus->busnr, dev->addr, flow_control);
}
static void usb_serial_set_xonxoff(USBSerialState *s, int xonxoff)
{
USBDevice *dev = USB_DEVICE(s);
USBBus *bus = usb_bus_from_device(dev);
s->xon = xonxoff & 0xff;
s->xoff = (xonxoff >> 8) & 0xff;
trace_usb_serial_set_xonxoff(bus->busnr, dev->addr, s->xon, s->xoff);
}
static void usb_serial_reset(USBSerialState *s)
{
s->event_chr = 0x0d;
s->event_trigger = 0;
s->recv_ptr = 0;
s->recv_used = 0;
/* TODO: purge in char driver */
usb_serial_set_flow_control(s, FTDI_NO_HS);
}
static void usb_serial_handle_reset(USBDevice *dev)
{
USBSerialState *s = USB_SERIAL(dev);
USBBus *bus = usb_bus_from_device(dev);
trace_usb_serial_reset(bus->busnr, dev->addr);
usb_serial_reset(s);
/* TODO: Reset char device, send BREAK? */
}
static uint8_t usb_get_modem_lines(USBSerialState *s)
{
int flags;
uint8_t ret;
if (qemu_chr_fe_ioctl(&s->cs,
CHR_IOCTL_SERIAL_GET_TIOCM, &flags) == -ENOTSUP) {
return FTDI_CTS | FTDI_DSR | FTDI_RLSD;
}
ret = 0;
if (flags & CHR_TIOCM_CTS) {
ret |= FTDI_CTS;
}
if (flags & CHR_TIOCM_DSR) {
ret |= FTDI_DSR;
}
if (flags & CHR_TIOCM_RI) {
ret |= FTDI_RI;
}
if (flags & CHR_TIOCM_CAR) {
ret |= FTDI_RLSD;
}
return ret;
}
static void usb_serial_handle_control(USBDevice *dev, USBPacket *p,
int request, int value, int index,
int length, uint8_t *data)
{
USBSerialState *s = USB_SERIAL(dev);
USBBus *bus = usb_bus_from_device(dev);
int ret;
trace_usb_serial_handle_control(bus->busnr, dev->addr, request, value);
ret = usb_desc_handle_control(dev, p, request, value, index, length, data);
if (ret >= 0) {
return;
}
switch (request) {
case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
break;
/* Class specific requests. */
case VendorDeviceOutRequest | FTDI_RESET:
switch (value) {
case FTDI_RESET_SIO:
usb_serial_reset(s);
break;
case FTDI_RESET_RX:
s->recv_ptr = 0;
s->recv_used = 0;
/* TODO: purge from char device */
break;
case FTDI_RESET_TX:
/* TODO: purge from char device */
break;
}
break;
case VendorDeviceOutRequest | FTDI_SET_MDM_CTRL:
{
static int flags;
qemu_chr_fe_ioctl(&s->cs, CHR_IOCTL_SERIAL_GET_TIOCM, &flags);
if (value & FTDI_SET_RTS) {
if (value & FTDI_RTS) {
flags |= CHR_TIOCM_RTS;
} else {
flags &= ~CHR_TIOCM_RTS;
}
}
if (value & FTDI_SET_DTR) {
if (value & FTDI_DTR) {
flags |= CHR_TIOCM_DTR;
} else {
flags &= ~CHR_TIOCM_DTR;
}
}
qemu_chr_fe_ioctl(&s->cs, CHR_IOCTL_SERIAL_SET_TIOCM, &flags);
break;
}
case VendorDeviceOutRequest | FTDI_SET_FLOW_CTRL: {
uint8_t flow_control = index >> 8;
usb_serial_set_flow_control(s, flow_control);
if (flow_control & FTDI_XON_XOFF_HS) {
usb_serial_set_xonxoff(s, value);
}
break;
}
case VendorDeviceOutRequest | FTDI_SET_BAUD: {
static const int subdivisors8[8] = { 0, 4, 2, 1, 3, 5, 6, 7 };
int subdivisor8 = subdivisors8[((value & 0xc000) >> 14)
| ((index & 1) << 2)];
int divisor = value & 0x3fff;
/* chip special cases */
if (divisor == 1 && subdivisor8 == 0) {
subdivisor8 = 4;
}
if (divisor == 0 && subdivisor8 == 0) {
divisor = 1;
}
s->params.speed = (48000000 / 2) / (8 * divisor + subdivisor8);
trace_usb_serial_set_baud(bus->busnr, dev->addr, s->params.speed);
qemu_chr_fe_ioctl(&s->cs, CHR_IOCTL_SERIAL_SET_PARAMS, &s->params);
break;
}
case VendorDeviceOutRequest | FTDI_SET_DATA:
switch (value & 0xff) {
case 7:
s->params.data_bits = 7;
break;
case 8:
s->params.data_bits = 8;
break;
default:
/*
* According to a comment in Linux's ftdi_sio.c original FTDI
* chips fall back to 8 data bits for unsupported data_bits
*/
trace_usb_serial_unsupported_data_bits(bus->busnr, dev->addr,
value & 0xff);
s->params.data_bits = 8;
}
switch (value & FTDI_PARITY) {
case 0:
s->params.parity = 'N';
break;
case FTDI_ODD:
s->params.parity = 'O';
break;
case FTDI_EVEN:
s->params.parity = 'E';
break;
default:
trace_usb_serial_unsupported_parity(bus->busnr, dev->addr,
value & FTDI_PARITY);
goto fail;
}
switch (value & FTDI_STOP) {
case FTDI_STOP1:
s->params.stop_bits = 1;
break;
case FTDI_STOP2:
s->params.stop_bits = 2;
break;
default:
trace_usb_serial_unsupported_stopbits(bus->busnr, dev->addr,
value & FTDI_STOP);
goto fail;
}
trace_usb_serial_set_data(bus->busnr, dev->addr, s->params.parity,
s->params.data_bits, s->params.stop_bits);
qemu_chr_fe_ioctl(&s->cs, CHR_IOCTL_SERIAL_SET_PARAMS, &s->params);
/* TODO: TX ON/OFF */
break;
case VendorDeviceRequest | FTDI_GET_MDM_ST:
data[0] = usb_get_modem_lines(s) | 1;
data[1] = FTDI_THRE | FTDI_TEMT;
p->actual_length = 2;
break;
case VendorDeviceOutRequest | FTDI_SET_EVENT_CHR:
/* TODO: handle it */
s->event_chr = value;
break;
case VendorDeviceOutRequest | FTDI_SET_ERROR_CHR:
/* TODO: handle it */
s->error_chr = value;
break;
case VendorDeviceOutRequest | FTDI_SET_LATENCY:
s->latency = value;
break;
case VendorDeviceRequest | FTDI_GET_LATENCY:
data[0] = s->latency;
p->actual_length = 1;
break;
default:
fail:
trace_usb_serial_unsupported_control(bus->busnr, dev->addr, request,
value);
p->status = USB_RET_STALL;
break;
}
}
static void usb_serial_token_in(USBSerialState *s, USBPacket *p)
{
const int max_packet_size = desc_iface0.eps[0].wMaxPacketSize;
int packet_len;
uint8_t header[2];
packet_len = p->iov.size;
if (packet_len <= 2) {
p->status = USB_RET_NAK;
return;
}
header[0] = usb_get_modem_lines(s) | 1;
/* We do not have the uart details */
/* handle serial break */
if (s->event_trigger && s->event_trigger & FTDI_BI) {
s->event_trigger &= ~FTDI_BI;
header[1] = FTDI_BI;
usb_packet_copy(p, header, 2);
return;
} else {
header[1] = 0;
}
if (!s->recv_used) {
p->status = USB_RET_NAK;
return;
}
while (s->recv_used && packet_len > 2) {
int first_len, len;
len = MIN(packet_len, max_packet_size);
len -= 2;
if (len > s->recv_used) {
len = s->recv_used;
}
first_len = RECV_BUF - s->recv_ptr;
if (first_len > len) {
first_len = len;
}
usb_packet_copy(p, header, 2);
usb_packet_copy(p, s->recv_buf + s->recv_ptr, first_len);
if (len > first_len) {
usb_packet_copy(p, s->recv_buf, len - first_len);
}
s->recv_used -= len;
s->recv_ptr = (s->recv_ptr + len) % RECV_BUF;
packet_len -= len + 2;
}
return;
}
static void usb_serial_handle_data(USBDevice *dev, USBPacket *p)
{
USBSerialState *s = USB_SERIAL(dev);
USBBus *bus = usb_bus_from_device(dev);
uint8_t devep = p->ep->nr;
struct iovec *iov;
int i;
switch (p->pid) {
case USB_TOKEN_OUT:
if (devep != 2) {
goto fail;
}
for (i = 0; i < p->iov.niov; i++) {
iov = p->iov.iov + i;
/*
* XXX this blocks entire thread. Rewrite to use
* qemu_chr_fe_write and background I/O callbacks
*/
qemu_chr_fe_write_all(&s->cs, iov->iov_base, iov->iov_len);
}
p->actual_length = p->iov.size;
break;
case USB_TOKEN_IN:
if (devep != 1) {
goto fail;
}
usb_serial_token_in(s, p);
break;
default:
trace_usb_serial_bad_token(bus->busnr, dev->addr);
fail:
p->status = USB_RET_STALL;
break;
}
}
static int usb_serial_can_read(void *opaque)
{
USBSerialState *s = opaque;
if (!s->dev.attached) {
return 0;
}
return RECV_BUF - s->recv_used;
}
static void usb_serial_read(void *opaque, const uint8_t *buf, int size)
{
USBSerialState *s = opaque;
int first_size, start;
/* room in the buffer? */
if (size > (RECV_BUF - s->recv_used)) {
size = RECV_BUF - s->recv_used;
}
start = s->recv_ptr + s->recv_used;
if (start < RECV_BUF) {
/* copy data to end of buffer */
first_size = RECV_BUF - start;
if (first_size > size) {
first_size = size;
}
memcpy(s->recv_buf + start, buf, first_size);
/* wrap around to front if needed */
if (size > first_size) {
memcpy(s->recv_buf, buf + first_size, size - first_size);
}
} else {
start -= RECV_BUF;
memcpy(s->recv_buf + start, buf, size);
}
s->recv_used += size;
usb_wakeup(s->intr, 0);
}
static void usb_serial_event(void *opaque, QEMUChrEvent event)
{
USBSerialState *s = opaque;
switch (event) {
case CHR_EVENT_BREAK:
s->event_trigger |= FTDI_BI;
break;
case CHR_EVENT_OPENED:
if (!s->always_plugged && !s->dev.attached) {
usb_device_attach(&s->dev, &error_abort);
}
break;
case CHR_EVENT_CLOSED:
if (!s->always_plugged && s->dev.attached) {
usb_device_detach(&s->dev);
}
break;
case CHR_EVENT_MUX_IN:
case CHR_EVENT_MUX_OUT:
/* Ignore */
break;
}
}
static void usb_serial_realize(USBDevice *dev, Error **errp)
{
USBSerialState *s = USB_SERIAL(dev);
Error *local_err = NULL;
usb_desc_create_serial(dev);
usb_desc_init(dev);
dev->auto_attach = 0;
if (!qemu_chr_fe_backend_connected(&s->cs)) {
error_setg(errp, "Property chardev is required");
return;
}
usb_check_attach(dev, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
qemu_chr_fe_set_handlers(&s->cs, usb_serial_can_read, usb_serial_read,
usb_serial_event, NULL, s, NULL, true);
usb_serial_handle_reset(dev);
if ((s->always_plugged || qemu_chr_fe_backend_open(&s->cs)) &&
!dev->attached) {
usb_device_attach(dev, &error_abort);
}
s->intr = usb_ep_get(dev, USB_TOKEN_IN, 1);
}
static USBDevice *usb_braille_init(void)
{
USBDevice *dev;
Chardev *cdrv;
cdrv = qemu_chr_new("braille", "braille", NULL);
if (!cdrv) {
return NULL;
}
dev = usb_new("usb-braille");
qdev_prop_set_chr(&dev->qdev, "chardev", cdrv);
return dev;
}
static const VMStateDescription vmstate_usb_serial = {
.name = "usb-serial",
.unmigratable = 1,
};
static Property serial_properties[] = {
DEFINE_PROP_CHR("chardev", USBSerialState, cs),
DEFINE_PROP_BOOL("always-plugged", USBSerialState, always_plugged, false),
DEFINE_PROP_END_OF_LIST(),
};
static void usb_serial_dev_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
uc->realize = usb_serial_realize;
uc->handle_reset = usb_serial_handle_reset;
uc->handle_control = usb_serial_handle_control;
uc->handle_data = usb_serial_handle_data;
dc->vmsd = &vmstate_usb_serial;
set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
}
static const TypeInfo usb_serial_dev_type_info = {
.name = TYPE_USB_SERIAL,
.parent = TYPE_USB_DEVICE,
.instance_size = sizeof(USBSerialState),
.abstract = true,
.class_init = usb_serial_dev_class_init,
};
static void usb_serial_class_initfn(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
uc->product_desc = "QEMU USB Serial";
uc->usb_desc = &desc_serial;
device_class_set_props(dc, serial_properties);
}
static const TypeInfo serial_info = {
.name = "usb-serial",
.parent = TYPE_USB_SERIAL,
.class_init = usb_serial_class_initfn,
};
static Property braille_properties[] = {
DEFINE_PROP_CHR("chardev", USBSerialState, cs),
DEFINE_PROP_END_OF_LIST(),
};
static void usb_braille_class_initfn(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
uc->product_desc = "QEMU USB Braille";
uc->usb_desc = &desc_braille;
device_class_set_props(dc, braille_properties);
}
static const TypeInfo braille_info = {
.name = "usb-braille",
.parent = TYPE_USB_SERIAL,
.class_init = usb_braille_class_initfn,
};
static void usb_serial_register_types(void)
{
type_register_static(&usb_serial_dev_type_info);
type_register_static(&serial_info);
type_register_static(&braille_info);
usb_legacy_register("usb-braille", "braille", usb_braille_init);
}
type_init(usb_serial_register_types)
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