2 * Virtio Console and Generic Serial Port Devices
4 * Copyright Red Hat, Inc. 2009, 2010
7 * Amit Shah <amit.shah@redhat.com>
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
13 #include "qemu-char.h"
14 #include "qemu-error.h"
15 #include "virtio-serial.h"
17 typedef struct VirtConsole
{
18 VirtIOSerialPort port
;
23 /* Callback function that's called when the guest sends us data */
24 static ssize_t
flush_buf(VirtIOSerialPort
*port
, const uint8_t *buf
, size_t len
)
26 VirtConsole
*vcon
= DO_UPCAST(VirtConsole
, port
, port
);
28 return qemu_chr_write(vcon
->chr
, buf
, len
);
31 /* Callback function that's called when the guest opens the port */
32 static void guest_open(VirtIOSerialPort
*port
)
34 VirtConsole
*vcon
= DO_UPCAST(VirtConsole
, port
, port
);
36 qemu_chr_guest_open(vcon
->chr
);
39 /* Callback function that's called when the guest closes the port */
40 static void guest_close(VirtIOSerialPort
*port
)
42 VirtConsole
*vcon
= DO_UPCAST(VirtConsole
, port
, port
);
44 qemu_chr_guest_close(vcon
->chr
);
47 /* Readiness of the guest to accept data on a port */
48 static int chr_can_read(void *opaque
)
50 VirtConsole
*vcon
= opaque
;
52 return virtio_serial_guest_ready(&vcon
->port
);
55 /* Send data from a char device over to the guest */
56 static void chr_read(void *opaque
, const uint8_t *buf
, int size
)
58 VirtConsole
*vcon
= opaque
;
60 virtio_serial_write(&vcon
->port
, buf
, size
);
63 static void chr_event(void *opaque
, int event
)
65 VirtConsole
*vcon
= opaque
;
68 case CHR_EVENT_OPENED
:
69 virtio_serial_open(&vcon
->port
);
71 case CHR_EVENT_CLOSED
:
72 virtio_serial_close(&vcon
->port
);
77 static int generic_port_init(VirtConsole
*vcon
, VirtIOSerialPort
*port
)
80 qemu_chr_add_handlers(vcon
->chr
, chr_can_read
, chr_read
, chr_event
,
82 vcon
->port
.info
->have_data
= flush_buf
;
83 vcon
->port
.info
->guest_open
= guest_open
;
84 vcon
->port
.info
->guest_close
= guest_close
;
89 /* Virtio Console Ports */
90 static int virtconsole_initfn(VirtIOSerialPort
*port
)
92 VirtConsole
*vcon
= DO_UPCAST(VirtConsole
, port
, port
);
94 port
->is_console_dummy
= true;
95 return generic_port_init(vcon
, port
);
98 static int virtconsole_exitfn(VirtIOSerialPort
*port
)
100 VirtConsole
*vcon
= DO_UPCAST(VirtConsole
, port
, port
);
104 * Instead of closing the chardev, free it so it can be used
105 * for other purposes.
107 qemu_chr_add_handlers(vcon
->chr
, NULL
, NULL
, NULL
, NULL
);
113 static VirtIOSerialPortInfo virtconsole_info
= {
114 .qdev
.name
= "virtconsole",
115 .qdev
.size
= sizeof(VirtConsole
),
117 .init
= virtconsole_initfn
,
118 .exit
= virtconsole_exitfn
,
119 .qdev
.props
= (Property
[]) {
120 DEFINE_PROP_UINT8("is_console", VirtConsole
, port
.is_console_dummy
, 1),
121 DEFINE_PROP_UINT32("nr", VirtConsole
, port
.id
, VIRTIO_CONSOLE_BAD_ID
),
122 DEFINE_PROP_CHR("chardev", VirtConsole
, chr
),
123 DEFINE_PROP_STRING("name", VirtConsole
, port
.name
),
124 DEFINE_PROP_END_OF_LIST(),
128 static void virtconsole_register(void)
130 virtio_serial_port_qdev_register(&virtconsole_info
);
132 device_init(virtconsole_register
)
134 /* Generic Virtio Serial Ports */
135 static int virtserialport_initfn(VirtIOSerialPort
*port
)
137 VirtConsole
*vcon
= DO_UPCAST(VirtConsole
, port
, port
);
141 * Disallow a generic port at id 0, that's reserved for
144 error_report("Port number 0 on virtio-serial devices reserved for virtconsole devices for backward compatibility.");
147 return generic_port_init(vcon
, port
);
150 static VirtIOSerialPortInfo virtserialport_info
= {
151 .qdev
.name
= "virtserialport",
152 .qdev
.size
= sizeof(VirtConsole
),
153 .init
= virtserialport_initfn
,
154 .exit
= virtconsole_exitfn
,
155 .qdev
.props
= (Property
[]) {
156 DEFINE_PROP_UINT32("nr", VirtConsole
, port
.id
, VIRTIO_CONSOLE_BAD_ID
),
157 DEFINE_PROP_CHR("chardev", VirtConsole
, chr
),
158 DEFINE_PROP_STRING("name", VirtConsole
, port
.name
),
159 DEFINE_PROP_END_OF_LIST(),
163 static void virtserialport_register(void)
165 virtio_serial_port_qdev_register(&virtserialport_info
);
167 device_init(virtserialport_register
)