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1What: /sys/class/tty/console/active
2Date: Nov 2010
3Contact: Kay Sievers <[email protected]>
4Description:
5 Shows the list of currently configured
6 console devices, like 'tty1 ttyS0'.
7 The last entry in the file is the active
8 device connected to /dev/console.
9 The file supports poll() to detect virtual
10 console switches.
11
12What: /sys/class/tty/tty<x>/active
13Date: Nov 2010
14Contact: Kay Sievers <[email protected]>
15Description:
16 Shows the currently active virtual console
17 device, like 'tty1'.
18 The file supports poll() to detect virtual
19 console switches.
20
21What: /sys/class/tty/ttyS<x>/uartclk
22Date: Sep 2012
23Contact: Tomas Hlavacek <[email protected]>
24Description:
25 Shows the current uartclk value associated with the
26 UART port in serial_core, that is bound to TTY like ttyS0.
27 uartclk = 16 * baud_base
28
29 These sysfs values expose the TIOCGSERIAL interface via
30 sysfs rather than via ioctls.
31
32What: /sys/class/tty/ttyS<x>/type
33Date: October 2012
34Contact: Alan Cox <[email protected]>
35Description:
36 Shows the current tty type for this port.
37
38 These sysfs values expose the TIOCGSERIAL interface via
39 sysfs rather than via ioctls.
40
41What: /sys/class/tty/ttyS<x>/line
42Date: October 2012
43Contact: Alan Cox <[email protected]>
44Description:
45 Shows the current tty line number for this port.
46
47 These sysfs values expose the TIOCGSERIAL interface via
48 sysfs rather than via ioctls.
49
50What: /sys/class/tty/ttyS<x>/port
51Date: October 2012
52Contact: Alan Cox <[email protected]>
53Description:
54 Shows the current tty port I/O address for this port.
55
56 These sysfs values expose the TIOCGSERIAL interface via
57 sysfs rather than via ioctls.
58
59What: /sys/class/tty/ttyS<x>/irq
60Date: October 2012
61Contact: Alan Cox <[email protected]>
62Description:
63 Shows the current primary interrupt for this port.
64
65 These sysfs values expose the TIOCGSERIAL interface via
66 sysfs rather than via ioctls.
67
68What: /sys/class/tty/ttyS<x>/flags
69Date: October 2012
70Contact: Alan Cox <[email protected]>
71Description:
72 Show the tty port status flags for this port.
73
74 These sysfs values expose the TIOCGSERIAL interface via
75 sysfs rather than via ioctls.
76
77What: /sys/class/tty/ttyS<x>/xmit_fifo_size
78Date: October 2012
79Contact: Alan Cox <[email protected]>
80Description:
81 Show the transmit FIFO size for this port.
82
83 These sysfs values expose the TIOCGSERIAL interface via
84 sysfs rather than via ioctls.
85
86What: /sys/class/tty/ttyS<x>/close_delay
87Date: October 2012
88Contact: Alan Cox <[email protected]>
89Description:
90 Show the closing delay time for this port in centiseconds.
91
92 These sysfs values expose the TIOCGSERIAL interface via
93 sysfs rather than via ioctls.
94
95What: /sys/class/tty/ttyS<x>/closing_wait
96Date: October 2012
97Contact: Alan Cox <[email protected]>
98Description:
99 Show the close wait time for this port in centiseconds.
100
101 Waiting forever is represented as 0. If waiting on close is
102 disabled then the value is 65535.
103
104 These sysfs values expose the TIOCGSERIAL interface via
105 sysfs rather than via ioctls.
106
107What: /sys/class/tty/ttyS<x>/custom_divisor
108Date: October 2012
109Contact: Alan Cox <[email protected]>
110Description:
111 Show the custom divisor if any that is set on this port.
112
113 These sysfs values expose the TIOCGSERIAL interface via
114 sysfs rather than via ioctls.
115
116What: /sys/class/tty/ttyS<x>/io_type
117Date: October 2012
118Contact: Alan Cox <[email protected]>
119Description:
120 Show the I/O type that is to be used with the iomem base
121 address.
122
123 These sysfs values expose the TIOCGSERIAL interface via
124 sysfs rather than via ioctls.
125
126What: /sys/class/tty/ttyS<x>/iomem_base
127Date: October 2012
128Contact: Alan Cox <[email protected]>
129Description:
130 The I/O memory base for this port.
131
132 These sysfs values expose the TIOCGSERIAL interface via
133 sysfs rather than via ioctls.
134
135What: /sys/class/tty/ttyS<x>/iomem_reg_shift
136Date: October 2012
137Contact: Alan Cox <[email protected]>
138Description:
139 Show the register shift indicating the spacing to be used
140 for accesses on this iomem address.
141
142 These sysfs values expose the TIOCGSERIAL interface via
143 sysfs rather than via ioctls.
144
145What: /sys/class/tty/ttyS<x>/rx_trig_bytes
146Date: May 2014
147Contact: Yoshihiro YUNOMAE <[email protected]>
148Description:
149 Shows current RX interrupt trigger bytes or sets the
150 user specified value to change it for the FIFO buffer.
151 Users can show or set this value regardless of opening the
152 serial device file or not.
153
154 The RX trigger can be set one of four kinds of values for UART
155 serials. When users input a meaning less value to this I/F,
156 the RX trigger is changed to the nearest lower value for the
157 device specification. For example, when user sets 7bytes on
158 16550A, which has 1/4/8/14 bytes trigger, the RX trigger is
159 automatically changed to 4 bytes.
160
161What: /sys/class/tty/ttyS<x>/console
162Date: February 2020
163Contact: Andy Shevchenko <[email protected]>
164Description:
165 Allows user to detach or attach back the given device as
166 kernel console. It shows and accepts a boolean variable.