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[PATCH v2 8/8] dev-serial: store flow control and xon/xoff characters
From: |
Mark Cave-Ayland |
Subject: |
[PATCH v2 8/8] dev-serial: store flow control and xon/xoff characters |
Date: |
Tue, 27 Oct 2020 15:04:56 +0000 |
Note that whilst the device does not do anything with these values, they are
logged with trace events and stored to allow future implementation.
The default flow control is set to none at reset as documented in the Linux
ftdi_sio.h header file.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
---
hw/usb/dev-serial.c | 38 +++++++++++++++++++++++++++++++++++---
hw/usb/trace-events | 2 ++
2 files changed, 37 insertions(+), 3 deletions(-)
diff --git a/hw/usb/dev-serial.c b/hw/usb/dev-serial.c
index e42ce36295..19e1933f04 100644
--- a/hw/usb/dev-serial.c
+++ b/hw/usb/dev-serial.c
@@ -52,6 +52,7 @@
/* SET_FLOW_CTRL */
+#define FTDI_NO_HS 0
#define FTDI_RTS_CTS_HS 1
#define FTDI_DTR_DSR_HS 2
#define FTDI_XON_XOFF_HS 4
@@ -98,6 +99,9 @@ struct USBSerialState {
uint8_t error_chr;
uint8_t event_trigger;
bool always_plugged;
+ uint8_t flow_control;
+ uint8_t xon;
+ uint8_t xoff;
QEMUSerialSetParams params;
int latency; /* ms */
CharBackend cs;
@@ -181,14 +185,36 @@ static const USBDesc desc_braille = {
.str = desc_strings,
};
+static void usb_serial_set_flow_control(USBSerialState *s,
+ uint8_t flow_control)
+{
+ USBDevice *dev = USB_DEVICE(s);
+ USBBus *bus = usb_bus_from_device(dev);
+
+ /* TODO: ioctl */
+ s->flow_control = flow_control;
+ trace_usb_serial_set_flow_control(bus->busnr, dev->addr, flow_control);
+}
+
+static void usb_serial_set_xonxoff(USBSerialState *s, int xonxoff)
+{
+ USBDevice *dev = USB_DEVICE(s);
+ USBBus *bus = usb_bus_from_device(dev);
+
+ s->xon = xonxoff & 0xff;
+ s->xoff = (xonxoff >> 8) & 0xff;
+
+ trace_usb_serial_set_xonxoff(bus->busnr, dev->addr, s->xon, s->xoff);
+}
+
static void usb_serial_reset(USBSerialState *s)
{
- /* TODO: Set flow control to none */
s->event_chr = 0x0d;
s->event_trigger = 0;
s->recv_ptr = 0;
s->recv_used = 0;
/* TODO: purge in char driver */
+ usb_serial_set_flow_control(s, FTDI_NO_HS);
}
static void usb_serial_handle_reset(USBDevice *dev)
@@ -285,9 +311,15 @@ static void usb_serial_handle_control(USBDevice *dev,
USBPacket *p,
qemu_chr_fe_ioctl(&s->cs, CHR_IOCTL_SERIAL_SET_TIOCM, &flags);
break;
}
- case VendorDeviceOutRequest | FTDI_SET_FLOW_CTRL:
- /* TODO: ioctl */
+ case VendorDeviceOutRequest | FTDI_SET_FLOW_CTRL: {
+ uint8_t flow_control = index >> 8;
+
+ usb_serial_set_flow_control(s, flow_control);
+ if (flow_control & FTDI_XON_XOFF_HS) {
+ usb_serial_set_xonxoff(s, value);
+ }
break;
+ }
case VendorDeviceOutRequest | FTDI_SET_BAUD: {
static const int subdivisors8[8] = { 0, 4, 2, 1, 3, 5, 6, 7 };
int subdivisor8 = subdivisors8[((value & 0xc000) >> 14)
diff --git a/hw/usb/trace-events b/hw/usb/trace-events
index 109da521cf..a3292d4624 100644
--- a/hw/usb/trace-events
+++ b/hw/usb/trace-events
@@ -331,3 +331,5 @@ usb_serial_unsupported_data_bits(int bus, int addr, int
value) "dev %d:%u unsupp
usb_serial_bad_token(int bus, int addr) "dev %d:%u bad token"
usb_serial_set_baud(int bus, int addr, int baud) "dev %d:%u baud rate %d"
usb_serial_set_data(int bus, int addr, int parity, int data, int stop) "dev
%d:%u parity %c, data bits %d, stop bits %d"
+usb_serial_set_flow_control(int bus, int addr, int index) "dev %d:%u flow
control %d"
+usb_serial_set_xonxoff(int bus, int addr, uint8_t xon, uint8_t xoff) "dev
%d:%u xon 0x%x xoff 0x%x"
--
2.20.1
- [PATCH v2 0/8] dev-serial: minor fixes and improvements, Mark Cave-Ayland, 2020/10/27
- [PATCH v2 1/8] dev-serial: style changes to improve readability and checkpatch fixes, Mark Cave-Ayland, 2020/10/27
- [PATCH v2 2/8] dev-serial: use USB_SERIAL QOM macro for USBSerialState assignments, Mark Cave-Ayland, 2020/10/27
- [PATCH v2 3/8] dev-serial: convert from DPRINTF to trace-events, Mark Cave-Ayland, 2020/10/27
- [PATCH v2 5/8] dev-serial: replace DeviceOutVendor/DeviceInVendor with equivalent macros from usb.h, Mark Cave-Ayland, 2020/10/27
- [PATCH v2 4/8] dev-serial: add trace-events for baud rate and data parameters, Mark Cave-Ayland, 2020/10/27
- [PATCH v2 6/8] dev-serial: add always-plugged property to ensure USB device is always attached, Mark Cave-Ayland, 2020/10/27
- [PATCH v2 7/8] dev-serial: add support for setting data_bits in QEMUSerialSetParams, Mark Cave-Ayland, 2020/10/27
- [PATCH v2 8/8] dev-serial: store flow control and xon/xoff characters,
Mark Cave-Ayland <=