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710 lines
19 KiB
C
710 lines
19 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/cutils.h"
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#include "qemu/error-report.h"
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#include "qemu/module.h"
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#include "hw/qdev-properties.h"
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#include "hw/qdev-properties-system.h"
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#include "hw/usb.h"
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#include "migration/vmstate.h"
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#include "desc.h"
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#include "chardev/char-serial.h"
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#include "chardev/char-fe.h"
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#include "qom/object.h"
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#include "trace.h"
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#define RECV_BUF (512 - (2 * 8))
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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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/* 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_NO_HS 0
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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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struct USBSerialState {
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USBDevice dev;
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USBEndpoint *intr;
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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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bool always_plugged;
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uint8_t flow_control;
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uint8_t xon;
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uint8_t xoff;
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QEMUSerialSetParams params;
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int latency; /* ms */
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CharBackend cs;
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};
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#define TYPE_USB_SERIAL "usb-serial-dev"
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OBJECT_DECLARE_SIMPLE_TYPE(USBSerialState, 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 | USB_CFG_ATT_WAKEUP,
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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_set_flow_control(USBSerialState *s,
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uint8_t flow_control)
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{
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USBDevice *dev = USB_DEVICE(s);
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USBBus *bus = usb_bus_from_device(dev);
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/* TODO: ioctl */
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s->flow_control = flow_control;
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trace_usb_serial_set_flow_control(bus->busnr, dev->addr, flow_control);
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}
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static void usb_serial_set_xonxoff(USBSerialState *s, int xonxoff)
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{
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USBDevice *dev = USB_DEVICE(s);
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USBBus *bus = usb_bus_from_device(dev);
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s->xon = xonxoff & 0xff;
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s->xoff = (xonxoff >> 8) & 0xff;
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trace_usb_serial_set_xonxoff(bus->busnr, dev->addr, s->xon, s->xoff);
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}
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static void usb_serial_reset(USBSerialState *s)
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{
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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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usb_serial_set_flow_control(s, FTDI_NO_HS);
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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 = USB_SERIAL(dev);
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USBBus *bus = usb_bus_from_device(dev);
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trace_usb_serial_reset(bus->busnr, dev->addr);
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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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}
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if (flags & CHR_TIOCM_DSR) {
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ret |= FTDI_DSR;
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}
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if (flags & CHR_TIOCM_RI) {
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ret |= FTDI_RI;
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}
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if (flags & CHR_TIOCM_CAR) {
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ret |= FTDI_RLSD;
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}
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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,
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int length, uint8_t *data)
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{
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USBSerialState *s = USB_SERIAL(dev);
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USBBus *bus = usb_bus_from_device(dev);
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int ret;
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trace_usb_serial_handle_control(bus->busnr, dev->addr, 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 VendorDeviceOutRequest | 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 VendorDeviceOutRequest | 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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}
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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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}
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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 VendorDeviceOutRequest | FTDI_SET_FLOW_CTRL: {
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uint8_t flow_control = index >> 8;
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usb_serial_set_flow_control(s, flow_control);
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if (flow_control & FTDI_XON_XOFF_HS) {
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usb_serial_set_xonxoff(s, value);
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}
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break;
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}
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case VendorDeviceOutRequest | 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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}
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if (divisor == 0 && subdivisor8 == 0) {
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divisor = 1;
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}
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s->params.speed = (48000000 / 2) / (8 * divisor + subdivisor8);
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trace_usb_serial_set_baud(bus->busnr, dev->addr, s->params.speed);
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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 VendorDeviceOutRequest | FTDI_SET_DATA:
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switch (value & 0xff) {
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case 7:
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s->params.data_bits = 7;
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break;
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case 8:
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s->params.data_bits = 8;
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break;
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default:
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/*
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* According to a comment in Linux's ftdi_sio.c original FTDI
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* chips fall back to 8 data bits for unsupported data_bits
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*/
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trace_usb_serial_unsupported_data_bits(bus->busnr, dev->addr,
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value & 0xff);
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s->params.data_bits = 8;
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}
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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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trace_usb_serial_unsupported_parity(bus->busnr, dev->addr,
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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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trace_usb_serial_unsupported_stopbits(bus->busnr, dev->addr,
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value & FTDI_STOP);
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goto fail;
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}
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trace_usb_serial_set_data(bus->busnr, dev->addr, s->params.parity,
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s->params.data_bits, s->params.stop_bits);
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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 VendorDeviceRequest | FTDI_GET_MDM_ST:
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data[0] = usb_get_modem_lines(s) | 1;
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data[1] = FTDI_THRE | FTDI_TEMT;
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p->actual_length = 2;
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break;
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case VendorDeviceOutRequest | 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 VendorDeviceOutRequest | 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 VendorDeviceOutRequest | FTDI_SET_LATENCY:
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s->latency = value;
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break;
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case VendorDeviceRequest | 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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trace_usb_serial_unsupported_control(bus->busnr, dev->addr, request,
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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_token_in(USBSerialState *s, USBPacket *p)
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{
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const int max_packet_size = desc_iface0.eps[0].wMaxPacketSize;
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int packet_len;
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uint8_t header[2];
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packet_len = p->iov.size;
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if (packet_len <= 2) {
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p->status = USB_RET_NAK;
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return;
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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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return;
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} else {
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header[1] = 0;
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}
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if (!s->recv_used) {
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p->status = USB_RET_NAK;
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return;
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}
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while (s->recv_used && packet_len > 2) {
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int first_len, len;
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len = MIN(packet_len, max_packet_size);
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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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}
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first_len = RECV_BUF - s->recv_ptr;
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if (first_len > len) {
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first_len = len;
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}
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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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}
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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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packet_len -= len + 2;
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}
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return;
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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 = USB_SERIAL(dev);
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USBBus *bus = usb_bus_from_device(dev);
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uint8_t devep = p->ep->nr;
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struct iovec *iov;
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int i;
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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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}
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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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/*
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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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*/
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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:
|
|
if (devep != 1) {
|
|
goto fail;
|
|
}
|
|
usb_serial_token_in(s, p);
|
|
break;
|
|
|
|
default:
|
|
trace_usb_serial_bad_token(bus->busnr, dev->addr);
|
|
fail:
|
|
p->status = USB_RET_STALL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int usb_serial_can_read(void *opaque)
|
|
{
|
|
USBSerialState *s = opaque;
|
|
|
|
if (!s->dev.attached) {
|
|
return 0;
|
|
}
|
|
return RECV_BUF - s->recv_used;
|
|
}
|
|
|
|
static void usb_serial_read(void *opaque, const uint8_t *buf, int size)
|
|
{
|
|
USBSerialState *s = opaque;
|
|
int first_size, start;
|
|
|
|
/* room in the buffer? */
|
|
if (size > (RECV_BUF - s->recv_used)) {
|
|
size = RECV_BUF - s->recv_used;
|
|
}
|
|
|
|
start = s->recv_ptr + s->recv_used;
|
|
if (start < RECV_BUF) {
|
|
/* copy data to end of buffer */
|
|
first_size = RECV_BUF - start;
|
|
if (first_size > size) {
|
|
first_size = size;
|
|
}
|
|
|
|
memcpy(s->recv_buf + start, buf, first_size);
|
|
|
|
/* wrap around to front if needed */
|
|
if (size > first_size) {
|
|
memcpy(s->recv_buf, buf + first_size, size - first_size);
|
|
}
|
|
} else {
|
|
start -= RECV_BUF;
|
|
memcpy(s->recv_buf + start, buf, size);
|
|
}
|
|
s->recv_used += size;
|
|
|
|
usb_wakeup(s->intr, 0);
|
|
}
|
|
|
|
static void usb_serial_event(void *opaque, QEMUChrEvent event)
|
|
{
|
|
USBSerialState *s = opaque;
|
|
|
|
switch (event) {
|
|
case CHR_EVENT_BREAK:
|
|
s->event_trigger |= FTDI_BI;
|
|
break;
|
|
case CHR_EVENT_OPENED:
|
|
if (!s->always_plugged && !s->dev.attached) {
|
|
usb_device_attach(&s->dev, &error_abort);
|
|
}
|
|
break;
|
|
case CHR_EVENT_CLOSED:
|
|
if (!s->always_plugged && s->dev.attached) {
|
|
usb_device_detach(&s->dev);
|
|
}
|
|
break;
|
|
case CHR_EVENT_MUX_IN:
|
|
case CHR_EVENT_MUX_OUT:
|
|
/* Ignore */
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void usb_serial_realize(USBDevice *dev, Error **errp)
|
|
{
|
|
USBSerialState *s = USB_SERIAL(dev);
|
|
Error *local_err = NULL;
|
|
|
|
usb_desc_create_serial(dev);
|
|
usb_desc_init(dev);
|
|
dev->auto_attach = 0;
|
|
|
|
if (!qemu_chr_fe_backend_connected(&s->cs)) {
|
|
error_setg(errp, "Property chardev is required");
|
|
return;
|
|
}
|
|
|
|
usb_check_attach(dev, &local_err);
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
return;
|
|
}
|
|
|
|
qemu_chr_fe_set_handlers(&s->cs, usb_serial_can_read, usb_serial_read,
|
|
usb_serial_event, NULL, s, NULL, true);
|
|
usb_serial_handle_reset(dev);
|
|
|
|
if ((s->always_plugged || qemu_chr_fe_backend_open(&s->cs)) &&
|
|
!dev->attached) {
|
|
usb_device_attach(dev, &error_abort);
|
|
}
|
|
s->intr = usb_ep_get(dev, USB_TOKEN_IN, 1);
|
|
}
|
|
|
|
static USBDevice *usb_braille_init(void)
|
|
{
|
|
USBDevice *dev;
|
|
Chardev *cdrv;
|
|
|
|
cdrv = qemu_chr_new("braille", "braille", NULL);
|
|
if (!cdrv) {
|
|
return NULL;
|
|
}
|
|
|
|
dev = usb_new("usb-braille");
|
|
qdev_prop_set_chr(&dev->qdev, "chardev", cdrv);
|
|
return dev;
|
|
}
|
|
|
|
static const VMStateDescription vmstate_usb_serial = {
|
|
.name = "usb-serial",
|
|
.unmigratable = 1,
|
|
};
|
|
|
|
static Property serial_properties[] = {
|
|
DEFINE_PROP_CHR("chardev", USBSerialState, cs),
|
|
DEFINE_PROP_BOOL("always-plugged", USBSerialState, always_plugged, false),
|
|
DEFINE_PROP_END_OF_LIST(),
|
|
};
|
|
|
|
static void usb_serial_dev_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
|
|
|
|
uc->realize = usb_serial_realize;
|
|
uc->handle_reset = usb_serial_handle_reset;
|
|
uc->handle_control = usb_serial_handle_control;
|
|
uc->handle_data = usb_serial_handle_data;
|
|
dc->vmsd = &vmstate_usb_serial;
|
|
set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
|
|
}
|
|
|
|
static const TypeInfo usb_serial_dev_type_info = {
|
|
.name = TYPE_USB_SERIAL,
|
|
.parent = TYPE_USB_DEVICE,
|
|
.instance_size = sizeof(USBSerialState),
|
|
.abstract = true,
|
|
.class_init = usb_serial_dev_class_init,
|
|
};
|
|
|
|
static void usb_serial_class_initfn(ObjectClass *klass, void *data)
|
|
{
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
|
|
|
|
uc->product_desc = "QEMU USB Serial";
|
|
uc->usb_desc = &desc_serial;
|
|
device_class_set_props(dc, serial_properties);
|
|
}
|
|
|
|
static const TypeInfo serial_info = {
|
|
.name = "usb-serial",
|
|
.parent = TYPE_USB_SERIAL,
|
|
.class_init = usb_serial_class_initfn,
|
|
};
|
|
|
|
static Property braille_properties[] = {
|
|
DEFINE_PROP_CHR("chardev", USBSerialState, cs),
|
|
DEFINE_PROP_END_OF_LIST(),
|
|
};
|
|
|
|
static void usb_braille_class_initfn(ObjectClass *klass, void *data)
|
|
{
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
|
|
|
|
uc->product_desc = "QEMU USB Braille";
|
|
uc->usb_desc = &desc_braille;
|
|
device_class_set_props(dc, braille_properties);
|
|
}
|
|
|
|
static const TypeInfo braille_info = {
|
|
.name = "usb-braille",
|
|
.parent = TYPE_USB_SERIAL,
|
|
.class_init = usb_braille_class_initfn,
|
|
};
|
|
|
|
static void usb_serial_register_types(void)
|
|
{
|
|
type_register_static(&usb_serial_dev_type_info);
|
|
type_register_static(&serial_info);
|
|
type_register_static(&braille_info);
|
|
usb_legacy_register("usb-braille", "braille", usb_braille_init);
|
|
}
|
|
|
|
type_init(usb_serial_register_types)
|