633 lines
17 KiB
C
633 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 licensed under the LGPL.
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qemu-common.h"
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#include "qemu/cutils.h"
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#include "qemu/error-report.h"
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#include "hw/usb.h"
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#include "hw/usb/desc.h"
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#include "chardev/char-serial.h"
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#include "chardev/char-fe.h"
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//#define DEBUG_Serial
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#ifdef DEBUG_Serial
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#define DPRINTF(fmt, ...) \
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do { printf("usb-serial: " fmt , ## __VA_ARGS__); } while (0)
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#else
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#define DPRINTF(fmt, ...) do {} while(0)
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#endif
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#define RECV_BUF 384
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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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uint8_t recv_buf[RECV_BUF];
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uint16_t recv_ptr;
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uint16_t recv_used;
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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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CharBackend cs;
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} USBSerialState;
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#define TYPE_USB_SERIAL "usb-serial-dev"
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#define USB_SERIAL_DEV(obj) OBJECT_CHECK(USBSerialState, (obj), TYPE_USB_SERIAL)
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enum {
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STR_MANUFACTURER = 1,
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STR_PRODUCT_SERIAL,
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STR_PRODUCT_BRAILLE,
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STR_SERIALNUMBER,
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};
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static const USBDescStrings desc_strings = {
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[STR_MANUFACTURER] = "QEMU",
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[STR_PRODUCT_SERIAL] = "QEMU USB SERIAL",
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[STR_PRODUCT_BRAILLE] = "QEMU USB BAUM BRAILLE",
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[STR_SERIALNUMBER] = "1",
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};
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static const USBDescIface desc_iface0 = {
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.bInterfaceNumber = 0,
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.bNumEndpoints = 2,
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.bInterfaceClass = 0xff,
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.bInterfaceSubClass = 0xff,
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.bInterfaceProtocol = 0xff,
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.eps = (USBDescEndpoint[]) {
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{
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.bEndpointAddress = USB_DIR_IN | 0x01,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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.wMaxPacketSize = 64,
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},{
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.bEndpointAddress = USB_DIR_OUT | 0x02,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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.wMaxPacketSize = 64,
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},
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}
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};
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static const USBDescDevice desc_device = {
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.bcdUSB = 0x0200,
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.bMaxPacketSize0 = 8,
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.bNumConfigurations = 1,
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.confs = (USBDescConfig[]) {
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{
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.bNumInterfaces = 1,
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.bConfigurationValue = 1,
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.bmAttributes = USB_CFG_ATT_ONE,
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.bMaxPower = 50,
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.nif = 1,
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.ifs = &desc_iface0,
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},
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},
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};
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static const USBDesc desc_serial = {
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.id = {
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.idVendor = 0x0403,
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.idProduct = 0x6001,
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.bcdDevice = 0x0400,
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.iManufacturer = STR_MANUFACTURER,
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.iProduct = STR_PRODUCT_SERIAL,
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.iSerialNumber = STR_SERIALNUMBER,
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},
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.full = &desc_device,
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.str = desc_strings,
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};
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static const USBDesc desc_braille = {
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.id = {
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.idVendor = 0x0403,
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.idProduct = 0xfe72,
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.bcdDevice = 0x0400,
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.iManufacturer = STR_MANUFACTURER,
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.iProduct = STR_PRODUCT_BRAILLE,
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.iSerialNumber = STR_SERIALNUMBER,
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},
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.full = &desc_device,
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.str = desc_strings,
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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_fe_ioctl(&s->cs,
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CHR_IOCTL_SERIAL_GET_TIOCM, &flags) == -ENOTSUP) {
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return FTDI_CTS|FTDI_DSR|FTDI_RLSD;
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}
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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 void usb_serial_handle_control(USBDevice *dev, USBPacket *p,
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int request, int value, 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;
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DPRINTF("got control %x, value %x\n",request, value);
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ret = usb_desc_handle_control(dev, p, request, value, index, length, data);
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if (ret >= 0) {
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return;
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}
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switch (request) {
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case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
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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_fe_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_fe_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_fe_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_fe_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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p->actual_length = 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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p->actual_length = 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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p->status = USB_RET_STALL;
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break;
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}
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}
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static void usb_serial_handle_data(USBDevice *dev, USBPacket *p)
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{
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USBSerialState *s = (USBSerialState *)dev;
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uint8_t devep = p->ep->nr;
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struct iovec *iov;
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uint8_t header[2];
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int i, first_len, 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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for (i = 0; i < p->iov.niov; i++) {
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iov = p->iov.iov + i;
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/* XXX this blocks entire thread. Rewrite to use
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* qemu_chr_fe_write and background I/O callbacks */
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qemu_chr_fe_write_all(&s->cs, iov->iov_base, iov->iov_len);
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}
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p->actual_length = p->iov.size;
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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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len = p->iov.size;
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if (len <= 2) {
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p->status = USB_RET_NAK;
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break;
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}
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header[0] = usb_get_modem_lines(s) | 1;
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/* We do not have the uart details */
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/* handle serial break */
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if (s->event_trigger && s->event_trigger & FTDI_BI) {
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s->event_trigger &= ~FTDI_BI;
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header[1] = FTDI_BI;
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usb_packet_copy(p, header, 2);
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break;
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} else {
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header[1] = 0;
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}
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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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p->status = 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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usb_packet_copy(p, header, 2);
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usb_packet_copy(p, s->recv_buf + s->recv_ptr, first_len);
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if (len > first_len)
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usb_packet_copy(p, 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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break;
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default:
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DPRINTF("Bad token\n");
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fail:
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p->status = USB_RET_STALL;
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break;
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}
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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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if (!s->dev.attached) {
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return 0;
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}
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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, start;
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/* room in the buffer? */
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if (size > (RECV_BUF - s->recv_used))
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size = RECV_BUF - s->recv_used;
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start = s->recv_ptr + s->recv_used;
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if (start < RECV_BUF) {
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/* copy data to end of buffer */
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first_size = RECV_BUF - start;
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if (first_size > size)
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first_size = size;
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memcpy(s->recv_buf + start, buf, first_size);
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/* wrap around to front if needed */
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if (size > first_size)
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memcpy(s->recv_buf, buf + first_size, size - first_size);
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} else {
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start -= RECV_BUF;
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memcpy(s->recv_buf + start, buf, size);
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}
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s->recv_used += size;
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}
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static void usb_serial_event(void *opaque, int event)
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{
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USBSerialState *s = opaque;
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switch (event) {
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case CHR_EVENT_BREAK:
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s->event_trigger |= FTDI_BI;
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break;
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case CHR_EVENT_OPENED:
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if (!s->dev.attached) {
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usb_device_attach(&s->dev, &error_abort);
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}
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break;
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case CHR_EVENT_CLOSED:
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if (s->dev.attached) {
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usb_device_detach(&s->dev);
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}
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break;
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}
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}
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static void usb_serial_realize(USBDevice *dev, Error **errp)
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{
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USBSerialState *s = USB_SERIAL_DEV(dev);
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Error *local_err = NULL;
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usb_desc_create_serial(dev);
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usb_desc_init(dev);
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dev->auto_attach = 0;
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if (!qemu_chr_fe_backend_connected(&s->cs)) {
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error_setg(errp, "Property chardev is required");
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return;
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}
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usb_check_attach(dev, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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return;
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}
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qemu_chr_fe_set_handlers(&s->cs, usb_serial_can_read, usb_serial_read,
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usb_serial_event, NULL, s, NULL, true);
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usb_serial_handle_reset(dev);
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if (qemu_chr_fe_backend_open(&s->cs) && !dev->attached) {
|
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usb_device_attach(dev, &error_abort);
|
|
}
|
|
}
|
|
|
|
static USBDevice *usb_serial_init(USBBus *bus, const char *filename)
|
|
{
|
|
USBDevice *dev;
|
|
Chardev *cdrv;
|
|
char label[32];
|
|
static int index;
|
|
|
|
if (*filename == ':') {
|
|
filename++;
|
|
} else if (*filename) {
|
|
error_report("unrecognized serial USB option %s", filename);
|
|
return NULL;
|
|
}
|
|
if (!*filename) {
|
|
error_report("character device specification needed");
|
|
return NULL;
|
|
}
|
|
|
|
snprintf(label, sizeof(label), "usbserial%d", index++);
|
|
cdrv = qemu_chr_new(label, filename);
|
|
if (!cdrv)
|
|
return NULL;
|
|
|
|
dev = usb_create(bus, "usb-serial");
|
|
qdev_prop_set_chr(&dev->qdev, "chardev", cdrv);
|
|
|
|
return dev;
|
|
}
|
|
|
|
static USBDevice *usb_braille_init(USBBus *bus, const char *unused)
|
|
{
|
|
USBDevice *dev;
|
|
Chardev *cdrv;
|
|
|
|
cdrv = qemu_chr_new("braille", "braille");
|
|
if (!cdrv)
|
|
return NULL;
|
|
|
|
dev = usb_create(bus, "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_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;
|
|
dc->props = 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;
|
|
dc->props = 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);
|
|
usb_legacy_register("usb-serial", "serial", usb_serial_init);
|
|
type_register_static(&braille_info);
|
|
usb_legacy_register("usb-braille", "braille", usb_braille_init);
|
|
}
|
|
|
|
type_init(usb_serial_register_types)
|