586 lines
17 KiB
C
586 lines
17 KiB
C
/*
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* FTDI FT232BM Device emulation
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*
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* Copyright (c) 2006 CodeSourcery.
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* Copyright (c) 2008 Samuel Thibault <samuel.thibault@ens-lyon.org>
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* Written by Paul Brook, reused for FTDI by Samuel Thibault
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*
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* This code is licenced under the LGPL.
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*/
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#include "qemu-common.h"
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#include "usb.h"
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#include "qemu-char.h"
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//#define DEBUG_Serial
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#ifdef DEBUG_Serial
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#define DPRINTF(fmt, args...) \
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do { printf("usb-serial: " 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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#define RECV_BUF 384
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#define SEND_BUF 128 // Not used for now
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/* Commands */
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#define FTDI_RESET 0
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#define FTDI_SET_MDM_CTRL 1
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#define FTDI_SET_FLOW_CTRL 2
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#define FTDI_SET_BAUD 3
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#define FTDI_SET_DATA 4
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#define FTDI_GET_MDM_ST 5
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#define FTDI_SET_EVENT_CHR 6
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#define FTDI_SET_ERROR_CHR 7
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#define FTDI_SET_LATENCY 9
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#define FTDI_GET_LATENCY 10
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#define DeviceOutVendor ((USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_DEVICE)<<8)
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#define DeviceInVendor ((USB_DIR_IN |USB_TYPE_VENDOR|USB_RECIP_DEVICE)<<8)
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/* RESET */
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#define FTDI_RESET_SIO 0
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#define FTDI_RESET_RX 1
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#define FTDI_RESET_TX 2
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/* SET_MDM_CTRL */
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#define FTDI_DTR 1
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#define FTDI_SET_DTR (FTDI_DTR << 8)
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#define FTDI_RTS 2
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#define FTDI_SET_RTS (FTDI_RTS << 8)
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/* SET_FLOW_CTRL */
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#define FTDI_RTS_CTS_HS 1
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#define FTDI_DTR_DSR_HS 2
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#define FTDI_XON_XOFF_HS 4
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/* SET_DATA */
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#define FTDI_PARITY (0x7 << 8)
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#define FTDI_ODD (0x1 << 8)
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#define FTDI_EVEN (0x2 << 8)
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#define FTDI_MARK (0x3 << 8)
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#define FTDI_SPACE (0x4 << 8)
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#define FTDI_STOP (0x3 << 11)
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#define FTDI_STOP1 (0x0 << 11)
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#define FTDI_STOP15 (0x1 << 11)
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#define FTDI_STOP2 (0x2 << 11)
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/* GET_MDM_ST */
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/* TODO: should be sent every 40ms */
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#define FTDI_CTS (1<<4) // CTS line status
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#define FTDI_DSR (1<<5) // DSR line status
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#define FTDI_RI (1<<6) // RI line status
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#define FTDI_RLSD (1<<7) // Receive Line Signal Detect
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/* Status */
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#define FTDI_DR (1<<0) // Data Ready
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#define FTDI_OE (1<<1) // Overrun Err
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#define FTDI_PE (1<<2) // Parity Err
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#define FTDI_FE (1<<3) // Framing Err
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#define FTDI_BI (1<<4) // Break Interrupt
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#define FTDI_THRE (1<<5) // Transmitter Holding Register
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#define FTDI_TEMT (1<<6) // Transmitter Empty
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#define FTDI_FIFO (1<<7) // Error in FIFO
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typedef struct {
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USBDevice dev;
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uint16_t vendorid;
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uint16_t productid;
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uint8_t recv_buf[RECV_BUF];
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uint8_t recv_ptr;
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uint8_t recv_used;
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uint8_t send_buf[SEND_BUF];
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uint8_t event_chr;
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uint8_t error_chr;
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uint8_t event_trigger;
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QEMUSerialSetParams params;
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int latency; /* ms */
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CharDriverState *cs;
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} USBSerialState;
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static const uint8_t qemu_serial_dev_descriptor[] = {
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0x12, /* u8 bLength; */
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0x01, /* u8 bDescriptorType; Device */
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0x00, 0x02, /* u16 bcdUSB; v2.0 */
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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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0x03, 0x04, /* u16 idVendor; */
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0x00, 0xFF, /* u16 idProduct; */
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0x00, 0x04, /* u16 bcdDevice */
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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_serial_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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0x80, /* 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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100/2, /* u8 MaxPower; */
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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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0xff, /* u8 if_bInterfaceClass; Vendor Specific */
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0xff, /* u8 if_bInterfaceSubClass; Vendor Specific */
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0xff, /* u8 if_bInterfaceProtocol; Vendor Specific */
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0x02, /* 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_serial_reset(USBSerialState *s)
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{
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/* TODO: Set flow control to none */
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s->event_chr = 0x0d;
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s->event_trigger = 0;
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s->recv_ptr = 0;
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s->recv_used = 0;
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/* TODO: purge in char driver */
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}
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static void usb_serial_handle_reset(USBDevice *dev)
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{
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USBSerialState *s = (USBSerialState *)dev;
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DPRINTF("Reset\n");
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usb_serial_reset(s);
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/* TODO: Reset char device, send BREAK? */
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}
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static uint8_t usb_get_modem_lines(USBSerialState *s)
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{
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int flags;
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uint8_t ret;
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if (qemu_chr_ioctl(s->cs, CHR_IOCTL_SERIAL_GET_TIOCM, &flags) == -ENOTSUP)
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return FTDI_CTS|FTDI_DSR|FTDI_RLSD;
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ret = 0;
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if (flags & CHR_TIOCM_CTS)
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ret |= FTDI_CTS;
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if (flags & CHR_TIOCM_DSR)
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ret |= FTDI_DSR;
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if (flags & CHR_TIOCM_RI)
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ret |= FTDI_RI;
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if (flags & CHR_TIOCM_CAR)
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ret |= FTDI_RLSD;
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return ret;
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}
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static int usb_serial_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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USBSerialState *s = (USBSerialState *)dev;
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int ret = 0;
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//DPRINTF("got control %x, value %x\n",request, value);
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switch (request) {
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case DeviceRequest | USB_REQ_GET_STATUS:
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data[0] = (0 << 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_serial_dev_descriptor,
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sizeof(qemu_serial_dev_descriptor));
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data[8] = s->vendorid & 0xff;
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data[9] = ((s->vendorid) >> 8) & 0xff;
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data[10] = s->productid & 0xff;
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data[11] = ((s->productid) >> 8) & 0xff;
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ret = sizeof(qemu_serial_dev_descriptor);
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break;
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case USB_DT_CONFIG:
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memcpy(data, qemu_serial_config_descriptor,
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sizeof(qemu_serial_config_descriptor));
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ret = sizeof(qemu_serial_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 SERIAL");
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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 InterfaceOutRequest | 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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ret = 0;
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break;
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/* Class specific requests. */
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case DeviceOutVendor | FTDI_RESET:
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switch (value) {
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case FTDI_RESET_SIO:
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usb_serial_reset(s);
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break;
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case FTDI_RESET_RX:
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s->recv_ptr = 0;
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s->recv_used = 0;
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/* TODO: purge from char device */
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break;
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case FTDI_RESET_TX:
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/* TODO: purge from char device */
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break;
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}
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break;
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case DeviceOutVendor | FTDI_SET_MDM_CTRL:
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{
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static int flags;
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qemu_chr_ioctl(s->cs,CHR_IOCTL_SERIAL_GET_TIOCM, &flags);
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if (value & FTDI_SET_RTS) {
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if (value & FTDI_RTS)
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flags |= CHR_TIOCM_RTS;
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else
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flags &= ~CHR_TIOCM_RTS;
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}
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if (value & FTDI_SET_DTR) {
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if (value & FTDI_DTR)
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flags |= CHR_TIOCM_DTR;
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else
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flags &= ~CHR_TIOCM_DTR;
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}
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qemu_chr_ioctl(s->cs,CHR_IOCTL_SERIAL_SET_TIOCM, &flags);
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break;
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}
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case DeviceOutVendor | FTDI_SET_FLOW_CTRL:
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/* TODO: ioctl */
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break;
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case DeviceOutVendor | FTDI_SET_BAUD: {
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static const int subdivisors8[8] = { 0, 4, 2, 1, 3, 5, 6, 7 };
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int subdivisor8 = subdivisors8[((value & 0xc000) >> 14)
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| ((index & 1) << 2)];
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int divisor = value & 0x3fff;
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/* chip special cases */
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if (divisor == 1 && subdivisor8 == 0)
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subdivisor8 = 4;
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if (divisor == 0 && subdivisor8 == 0)
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divisor = 1;
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s->params.speed = (48000000 / 2) / (8 * divisor + subdivisor8);
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qemu_chr_ioctl(s->cs, CHR_IOCTL_SERIAL_SET_PARAMS, &s->params);
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break;
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}
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case DeviceOutVendor | FTDI_SET_DATA:
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switch (value & FTDI_PARITY) {
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case 0:
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s->params.parity = 'N';
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break;
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case FTDI_ODD:
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s->params.parity = 'O';
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break;
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case FTDI_EVEN:
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s->params.parity = 'E';
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break;
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default:
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DPRINTF("unsupported parity %d\n", value & FTDI_PARITY);
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goto fail;
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}
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switch (value & FTDI_STOP) {
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case FTDI_STOP1:
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s->params.stop_bits = 1;
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break;
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case FTDI_STOP2:
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s->params.stop_bits = 2;
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break;
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default:
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DPRINTF("unsupported stop bits %d\n", value & FTDI_STOP);
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goto fail;
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}
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qemu_chr_ioctl(s->cs, CHR_IOCTL_SERIAL_SET_PARAMS, &s->params);
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/* TODO: TX ON/OFF */
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break;
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case DeviceInVendor | FTDI_GET_MDM_ST:
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data[0] = usb_get_modem_lines(s) | 1;
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data[1] = 0;
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ret = 2;
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break;
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case DeviceOutVendor | FTDI_SET_EVENT_CHR:
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/* TODO: handle it */
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s->event_chr = value;
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break;
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case DeviceOutVendor | FTDI_SET_ERROR_CHR:
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/* TODO: handle it */
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s->error_chr = value;
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break;
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case DeviceOutVendor | FTDI_SET_LATENCY:
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s->latency = value;
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break;
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case DeviceInVendor | FTDI_GET_LATENCY:
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data[0] = s->latency;
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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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DPRINTF("got unsupported/bogus control %x, value %x\n", request, value);
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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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static int usb_serial_handle_data(USBDevice *dev, USBPacket *p)
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{
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USBSerialState *s = (USBSerialState *)dev;
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int ret = 0;
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uint8_t devep = p->devep;
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uint8_t *data = p->data;
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int len = p->len;
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int first_len;
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switch (p->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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qemu_chr_write(s->cs, data, len);
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break;
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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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first_len = RECV_BUF - s->recv_ptr;
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if (len <= 2) {
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ret = USB_RET_NAK;
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break;
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}
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*data++ = usb_get_modem_lines(s) | 1;
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/* We do not have the uart details */
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*data++ = 0;
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len -= 2;
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if (len > s->recv_used)
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len = s->recv_used;
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if (!len) {
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ret = USB_RET_NAK;
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break;
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}
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if (first_len > len)
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first_len = len;
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memcpy(data, s->recv_buf + s->recv_ptr, first_len);
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if (len > first_len)
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memcpy(data + first_len, s->recv_buf, len - first_len);
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s->recv_used -= len;
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s->recv_ptr = (s->recv_ptr + len) % RECV_BUF;
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ret = len + 2;
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break;
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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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static void usb_serial_handle_destroy(USBDevice *dev)
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{
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USBSerialState *s = (USBSerialState *)dev;
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qemu_chr_close(s->cs);
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qemu_free(s);
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}
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static int usb_serial_can_read(void *opaque)
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{
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USBSerialState *s = opaque;
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return RECV_BUF - s->recv_used;
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}
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static void usb_serial_read(void *opaque, const uint8_t *buf, int size)
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{
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USBSerialState *s = opaque;
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int first_size = RECV_BUF - s->recv_ptr;
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if (first_size > size)
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first_size = size;
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memcpy(s->recv_buf + s->recv_ptr + s->recv_used, buf, first_size);
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if (size > first_size)
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memcpy(s->recv_buf, buf + first_size, size - first_size);
|
|
s->recv_used += size;
|
|
}
|
|
|
|
static 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 = 0x6001;
|
|
|
|
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;
|
|
}
|