USB-to-serial device (Samuel Thibault).

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3914 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 549 insertions, 0 deletions

diff --git a/hw/usb-serial.c b/hw/usb-serial.c
new file mode 100644
index 000000000..378d75126
--- /dev/null
+++ b/hw/usb-serial.c
@@ -0,0 +1,549 @@
+/*
+ * 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 licenced under the LGPL.
+ */
+
+#include "qemu-common.h"
+#include "usb.h"
+#include "qemu-char.h"
+
+//#define DEBUG_Serial
+
+#ifdef DEBUG_Serial
+#define DPRINTF(fmt, args...) \
+do { printf("usb-serial: " fmt , ##args); } while (0)
+#else
+#define DPRINTF(fmt, args...) do {} while(0)
+#endif
+
+#define RECV_BUF 384
+#define SEND_BUF 128        // Not used for now
+
+/* 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
+
+#define DeviceOutVendor	((USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_DEVICE)<<8)
+#define DeviceInVendor	((USB_DIR_IN |USB_TYPE_VENDOR|USB_RECIP_DEVICE)<<8)
+
+/* RESET */
+
+#define FTDI_RESET_SIO	0
+#define FTDI_RESET_RX	1
+#define FTDI_RESET_TX	2
+
+/* SET_MDM_CTRL */
+
+#define FTDI_MDM_CTRL	3
+#define FTDI_DTR	1
+#define FTDI_RTS	2
+
+/* SET_FLOW_CTRL */
+
+#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
+
+typedef struct {
+    USBDevice dev;
+    uint16_t vendorid;
+    uint16_t productid;
+    uint8_t recv_buf[RECV_BUF];
+    uint8_t recv_ptr;
+    uint8_t recv_used;
+    uint8_t send_buf[SEND_BUF];
+    uint8_t event_chr;
+    uint8_t error_chr;
+    uint8_t event_trigger;
+    uint8_t lines;
+    QEMUSerialSetParams params;
+    int latency;        /* ms */
+    CharDriverState *cs;
+} USBSerialState;
+
+static const uint8_t qemu_serial_dev_descriptor[] = {
+        0x12,       /*  u8 bLength; */
+        0x01,       /*  u8 bDescriptorType; Device */
+        0x00, 0x02, /*  u16 bcdUSB; v2.0 */
+
+        0x00,       /*  u8  bDeviceClass; */
+        0x00,       /*  u8  bDeviceSubClass; */
+        0x00,       /*  u8  bDeviceProtocol; [ low/full speeds only ] */
+        0x08,       /*  u8  bMaxPacketSize0; 8 Bytes */
+
+        /* Vendor and product id are arbitrary.  */
+        0x03, 0x04, /*  u16 idVendor; */
+        0x00, 0xFF, /*  u16 idProduct; */
+        0x00, 0x04, /*  u16 bcdDevice */
+
+        0x01,       /*  u8  iManufacturer; */
+        0x02,       /*  u8  iProduct; */
+        0x03,       /*  u8  iSerialNumber; */
+        0x01        /*  u8  bNumConfigurations; */
+};
+
+static const uint8_t qemu_serial_config_descriptor[] = {
+
+        /* one configuration */
+        0x09,       /*  u8  bLength; */
+        0x02,       /*  u8  bDescriptorType; Configuration */
+        0x20, 0x00, /*  u16 wTotalLength; */
+        0x01,       /*  u8  bNumInterfaces; (1) */
+        0x01,       /*  u8  bConfigurationValue; */
+        0x00,       /*  u8  iConfiguration; */
+        0x80,       /*  u8  bmAttributes;
+                                 Bit 7: must be set,
+                                     6: Self-powered,
+                                     5: Remote wakeup,
+                                     4..0: resvd */
+        100/2,       /*  u8  MaxPower; */
+
+        /* one interface */
+        0x09,       /*  u8  if_bLength; */
+        0x04,       /*  u8  if_bDescriptorType; Interface */
+        0x00,       /*  u8  if_bInterfaceNumber; */
+        0x00,       /*  u8  if_bAlternateSetting; */
+        0x02,       /*  u8  if_bNumEndpoints; */
+        0xff,       /*  u8  if_bInterfaceClass; Vendor Specific */
+        0xff,       /*  u8  if_bInterfaceSubClass; Vendor Specific */
+        0xff,       /*  u8  if_bInterfaceProtocol; Vendor Specific */
+        0x02,       /*  u8  if_iInterface; */
+
+        /* Bulk-In endpoint */
+        0x07,       /*  u8  ep_bLength; */
+        0x05,       /*  u8  ep_bDescriptorType; Endpoint */
+        0x81,       /*  u8  ep_bEndpointAddress; IN Endpoint 1 */
+        0x02,       /*  u8  ep_bmAttributes; Bulk */
+        0x40, 0x00, /*  u16 ep_wMaxPacketSize; */
+        0x00,       /*  u8  ep_bInterval; */
+
+        /* Bulk-Out endpoint */
+        0x07,       /*  u8  ep_bLength; */
+        0x05,       /*  u8  ep_bDescriptorType; Endpoint */
+        0x02,       /*  u8  ep_bEndpointAddress; OUT Endpoint 2 */
+        0x02,       /*  u8  ep_bmAttributes; Bulk */
+        0x40, 0x00, /*  u16 ep_wMaxPacketSize; */
+        0x00        /*  u8  ep_bInterval; */
+};
+
+static void usb_serial_reset(USBSerialState *s)
+{
+    /* TODO: Set flow control to none */
+    s->event_chr = 0x0d;
+    s->event_trigger = 0;
+    s->recv_ptr = 0;
+    s->recv_used = 0;
+    /* TODO: purge in char driver */
+    s->lines &= ~(FTDI_DTR|FTDI_RTS);
+}
+
+static void usb_serial_handle_reset(USBDevice *dev)
+{
+    USBSerialState *s = (USBSerialState *)dev;
+
+    DPRINTF("Reset\n");
+
+    usb_serial_reset(s);
+    /* TODO: Reset char device, send BREAK? */
+}
+
+static int usb_serial_handle_control(USBDevice *dev, int request, int value,
+                                  int index, int length, uint8_t *data)
+{
+    USBSerialState *s = (USBSerialState *)dev;
+    int ret = 0;
+
+    //DPRINTF("got control %x, value %x\n",request, value);
+    switch (request) {
+    case DeviceRequest | USB_REQ_GET_STATUS:
+        data[0] = (0 << USB_DEVICE_SELF_POWERED) |
+            (dev->remote_wakeup << USB_DEVICE_REMOTE_WAKEUP);
+        data[1] = 0x00;
+        ret = 2;
+        break;
+    case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
+        if (value == USB_DEVICE_REMOTE_WAKEUP) {
+            dev->remote_wakeup = 0;
+        } else {
+            goto fail;
+        }
+        ret = 0;
+        break;
+    case DeviceOutRequest | USB_REQ_SET_FEATURE:
+        if (value == USB_DEVICE_REMOTE_WAKEUP) {
+            dev->remote_wakeup = 1;
+        } else {
+            goto fail;
+        }
+        ret = 0;
+        break;
+    case DeviceOutRequest | USB_REQ_SET_ADDRESS:
+        dev->addr = value;
+        ret = 0;
+        break;
+    case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
+        switch(value >> 8) {
+        case USB_DT_DEVICE:
+            memcpy(data, qemu_serial_dev_descriptor,
+                   sizeof(qemu_serial_dev_descriptor));
+            data[8] = s->vendorid & 0xff;
+            data[9] = ((s->vendorid) >> 8) & 0xff;
+            data[10] = s->productid & 0xff;
+            data[11] = ((s->productid) >> 8) & 0xff;
+            ret = sizeof(qemu_serial_dev_descriptor);
+            break;
+        case USB_DT_CONFIG:
+            memcpy(data, qemu_serial_config_descriptor,
+                   sizeof(qemu_serial_config_descriptor));
+            ret = sizeof(qemu_serial_config_descriptor);
+            break;
+        case USB_DT_STRING:
+            switch(value & 0xff) {
+            case 0:
+                /* language ids */
+                data[0] = 4;
+                data[1] = 3;
+                data[2] = 0x09;
+                data[3] = 0x04;
+                ret = 4;
+                break;
+            case 1:
+                /* vendor description */
+                ret = set_usb_string(data, "QEMU " QEMU_VERSION);
+                break;
+            case 2:
+                /* product description */
+                ret = set_usb_string(data, "QEMU USB SERIAL");
+                break;
+            case 3:
+                /* serial number */
+                ret = set_usb_string(data, "1");
+                break;
+            default:
+                goto fail;
+            }
+            break;
+        default:
+            goto fail;
+        }
+        break;
+    case DeviceRequest | USB_REQ_GET_CONFIGURATION:
+        data[0] = 1;
+        ret = 1;
+        break;
+    case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
+        ret = 0;
+        break;
+    case DeviceRequest | USB_REQ_GET_INTERFACE:
+        data[0] = 0;
+        ret = 1;
+        break;
+    case InterfaceOutRequest | USB_REQ_SET_INTERFACE:
+        ret = 0;
+        break;
+    case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
+        ret = 0;
+        break;
+
+        /* Class specific requests.  */
+    case DeviceOutVendor | 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 DeviceOutVendor | FTDI_SET_MDM_CTRL:
+        s->lines = value & FTDI_MDM_CTRL;
+        break;
+    case DeviceOutVendor | FTDI_SET_FLOW_CTRL:
+        /* TODO: ioctl */
+        break;
+    case DeviceOutVendor | 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);
+        qemu_chr_ioctl(s->cs, CHR_IOCTL_SERIAL_SET_PARAMS, &s->params);
+        break;
+    }
+    case DeviceOutVendor | FTDI_SET_DATA:
+        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:
+                DPRINTF("unsupported parity %d\n", 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:
+                DPRINTF("unsupported stop bits %d\n", value & FTDI_STOP);
+                goto fail;
+        }
+        qemu_chr_ioctl(s->cs, CHR_IOCTL_SERIAL_SET_PARAMS, &s->params);
+        /* TODO: TX ON/OFF */
+        break;
+    case DeviceInVendor | FTDI_GET_MDM_ST:
+        /* TODO: return modem status */
+        data[0] = 0;
+        ret = 1;
+        break;
+    case DeviceOutVendor | FTDI_SET_EVENT_CHR:
+        /* TODO: handle it */
+        s->event_chr = value;
+        break;
+    case DeviceOutVendor | FTDI_SET_ERROR_CHR:
+        /* TODO: handle it */
+        s->error_chr = value;
+        break;
+    case DeviceOutVendor | FTDI_SET_LATENCY:
+        s->latency = value;
+        break;
+    case DeviceInVendor | FTDI_GET_LATENCY:
+        data[0] = s->latency;
+        ret = 1;
+        break;
+    default:
+    fail:
+        DPRINTF("got unsupported/bogus control %x, value %x\n", request, value);
+        ret = USB_RET_STALL;
+        break;
+    }
+    return ret;
+}
+
+static int usb_serial_handle_data(USBDevice *dev, USBPacket *p)
+{
+    USBSerialState *s = (USBSerialState *)dev;
+    int ret = 0;
+    uint8_t devep = p->devep;
+    uint8_t *data = p->data;
+    int len = p->len;
+    int first_len;
+
+    switch (p->pid) {
+    case USB_TOKEN_OUT:
+        if (devep != 2)
+            goto fail;
+        qemu_chr_write(s->cs, data, len);
+        break;
+
+    case USB_TOKEN_IN:
+        if (devep != 1)
+            goto fail;
+        first_len = RECV_BUF - s->recv_ptr;
+        if (len <= 2) {
+            ret = USB_RET_NAK;
+            break;
+        }
+        /* TODO: Report serial line status */
+        *data++ = 0;
+        *data++ = 0;
+        len -= 2;
+        if (len > s->recv_used)
+            len = s->recv_used;
+        if (!len) {
+            ret = USB_RET_NAK;
+            break;
+        }
+        if (first_len > len)
+            first_len = len;
+        memcpy(data, s->recv_buf + s->recv_ptr, first_len);
+        if (len > first_len)
+            memcpy(data + first_len, s->recv_buf, len - first_len);
+        s->recv_used -= len;
+        s->recv_ptr = (s->recv_ptr + len) % RECV_BUF;
+        ret = len + 2;
+        break;
+
+    default:
+        DPRINTF("Bad token\n");
+    fail:
+        ret = USB_RET_STALL;
+        break;
+    }
+
+    return ret;
+}
+
+static void usb_serial_handle_destroy(USBDevice *dev)
+{
+    USBSerialState *s = (USBSerialState *)dev;
+
+    qemu_chr_close(s->cs);
+    qemu_free(s);
+}
+
+int usb_serial_can_read(void *opaque)
+{
+    USBSerialState *s = opaque;
+    return RECV_BUF - s->recv_used;
+}
+
+void usb_serial_read(void *opaque, const uint8_t *buf, int size)
+{
+    USBSerialState *s = opaque;
+    int first_size = RECV_BUF - s->recv_ptr;
+    if (first_size > size)
+        first_size = size;
+    memcpy(s->recv_buf + s->recv_ptr + s->recv_used, buf, first_size);
+    if (size > first_size)
+        memcpy(s->recv_buf, buf + first_size, size - first_size);
+    s->recv_used += size;
+}
+
+void usb_serial_event(void *opaque, int event)
+{
+    USBSerialState *s = opaque;
+
+    switch (event) {
+        case CHR_EVENT_BREAK:
+            /* TODO: Send Break to USB */
+            break;
+        case CHR_EVENT_FOCUS:
+            break;
+        case CHR_EVENT_RESET:
+            usb_serial_reset(s);
+            /* TODO: Reset USB port */
+            break;
+    }
+}
+
+USBDevice *usb_serial_init(const char *filename)
+{
+    USBSerialState *s;
+    CharDriverState *cdrv;
+    unsigned short vendorid = 0x0403, productid = 0xFF00;
+
+    while (*filename && *filename != ':') {
+        const char *p;
+        char *e;
+        if (strstart(filename, "vendorid=", &p)) {
+            vendorid = strtol(p, &e, 16);
+            if (e == p || (*e && *e != ',' && *e != ':')) {
+                printf("bogus vendor ID %s\n", p);
+                return NULL;
+            }
+            filename = e;
+        } else if (strstart(filename, "productid=", &p)) {
+            productid = strtol(p, &e, 16);
+            if (e == p || (*e && *e != ',' && *e != ':')) {
+                printf("bogus product ID %s\n", p);
+                return NULL;
+            }
+            filename = e;
+        } else {
+            printf("unrecognized serial USB option %s\n", filename);
+            return NULL;
+        }
+        while(*filename == ',')
+            filename++;
+    }
+    if (!*filename) {
+        printf("character device specification needed\n");
+        return NULL;
+    }
+    filename++;
+    s = qemu_mallocz(sizeof(USBSerialState));
+    if (!s)
+        return NULL;
+
+    cdrv = qemu_chr_open(filename);
+    if (!cdrv)
+        goto fail;
+    s->cs = cdrv;
+    qemu_chr_add_handlers(cdrv, usb_serial_can_read, usb_serial_read, usb_serial_event, s);
+
+    s->dev.speed = USB_SPEED_FULL;
+    s->dev.handle_packet = usb_generic_handle_packet;
+
+    s->dev.handle_reset = usb_serial_handle_reset;
+    s->dev.handle_control = usb_serial_handle_control;
+    s->dev.handle_data = usb_serial_handle_data;
+    s->dev.handle_destroy = usb_serial_handle_destroy;
+
+    s->vendorid = vendorid;
+    s->productid = productid;
+
+    snprintf(s->dev.devname, sizeof(s->dev.devname), "QEMU USB Serial(%.16s)",
+             filename);
+
+    usb_serial_handle_reset((USBDevice *)s);
+    return (USBDevice *)s;
+ fail:
+    qemu_free(s);
+    return NULL;
+}