1 What: /sys/class/tty/console/active 1 What: /sys/class/tty/console/active
2 Date: Nov 2010 2 Date: Nov 2010
3 Contact: Kay Sievers <kay.sievers@vrfy.o 3 Contact: Kay Sievers <kay.sievers@vrfy.org>
4 Description: 4 Description:
5 Shows the list of currently c 5 Shows the list of currently configured
6 console devices, like 'tty1 t 6 console devices, like 'tty1 ttyS0'.
7 The last entry in the file is 7 The last entry in the file is the active
8 device connected to /dev/cons 8 device connected to /dev/console.
9 The file supports poll() to d 9 The file supports poll() to detect virtual
10 console switches. 10 console switches.
11 11
12 What: /sys/class/tty/tty<x>/active 12 What: /sys/class/tty/tty<x>/active
13 Date: Nov 2010 13 Date: Nov 2010
14 Contact: Kay Sievers <kay.sievers@vrfy.o 14 Contact: Kay Sievers <kay.sievers@vrfy.org>
15 Description: 15 Description:
16 Shows the currently active vi 16 Shows the currently active virtual console
17 device, like 'tty1'. 17 device, like 'tty1'.
18 The file supports poll() to d 18 The file supports poll() to detect virtual
19 console switches. 19 console switches.
20 20
21 What: /sys/class/tty/ttyS<x>/uartclk 21 What: /sys/class/tty/ttyS<x>/uartclk
22 Date: Sep 2012 22 Date: Sep 2012
23 Contact: Tomas Hlavacek <tmshlvck@gmail. 23 Contact: Tomas Hlavacek <tmshlvck@gmail.com>
24 Description: 24 Description:
25 Shows the current uartclk val 25 Shows the current uartclk value associated with the
26 UART port in serial_core, tha 26 UART port in serial_core, that is bound to TTY like ttyS0.
27 uartclk = 16 * baud_base 27 uartclk = 16 * baud_base
28 28
29 These sysfs values expose the 29 These sysfs values expose the TIOCGSERIAL interface via
30 sysfs rather than via ioctls. 30 sysfs rather than via ioctls.
31 31
32 What: /sys/class/tty/ttyS<x>/type 32 What: /sys/class/tty/ttyS<x>/type
33 Date: October 2012 33 Date: October 2012
34 Contact: Alan Cox <alan@linux.intel.com> 34 Contact: Alan Cox <alan@linux.intel.com>
35 Description: 35 Description:
36 Shows the current tty type fo 36 Shows the current tty type for this port.
37 37
38 These sysfs values expose the 38 These sysfs values expose the TIOCGSERIAL interface via
39 sysfs rather than via ioctls. 39 sysfs rather than via ioctls.
40 40
41 What: /sys/class/tty/ttyS<x>/line 41 What: /sys/class/tty/ttyS<x>/line
42 Date: October 2012 42 Date: October 2012
43 Contact: Alan Cox <alan@linux.intel.com> 43 Contact: Alan Cox <alan@linux.intel.com>
44 Description: 44 Description:
45 Shows the current tty line nu 45 Shows the current tty line number for this port.
46 46
47 These sysfs values expose the 47 These sysfs values expose the TIOCGSERIAL interface via
48 sysfs rather than via ioctls. 48 sysfs rather than via ioctls.
49 49
50 What: /sys/class/tty/ttyS<x>/port 50 What: /sys/class/tty/ttyS<x>/port
51 Date: October 2012 51 Date: October 2012
52 Contact: Alan Cox <alan@linux.intel.com> 52 Contact: Alan Cox <alan@linux.intel.com>
53 Description: 53 Description:
54 Shows the current tty port I/ 54 Shows the current tty port I/O address for this port.
55 55
56 These sysfs values expose the 56 These sysfs values expose the TIOCGSERIAL interface via
57 sysfs rather than via ioctls. 57 sysfs rather than via ioctls.
58 58
59 What: /sys/class/tty/ttyS<x>/irq 59 What: /sys/class/tty/ttyS<x>/irq
60 Date: October 2012 60 Date: October 2012
61 Contact: Alan Cox <alan@linux.intel.com> 61 Contact: Alan Cox <alan@linux.intel.com>
62 Description: 62 Description:
63 Shows the current primary int 63 Shows the current primary interrupt for this port.
64 64
65 These sysfs values expose the 65 These sysfs values expose the TIOCGSERIAL interface via
66 sysfs rather than via ioctls. 66 sysfs rather than via ioctls.
67 67
68 What: /sys/class/tty/ttyS<x>/flags 68 What: /sys/class/tty/ttyS<x>/flags
69 Date: October 2012 69 Date: October 2012
70 Contact: Alan Cox <alan@linux.intel.com> 70 Contact: Alan Cox <alan@linux.intel.com>
71 Description: 71 Description:
72 Show the tty port status flag 72 Show the tty port status flags for this port.
73 73
74 These sysfs values expose the 74 These sysfs values expose the TIOCGSERIAL interface via
75 sysfs rather than via ioctls. 75 sysfs rather than via ioctls.
76 76
77 What: /sys/class/tty/ttyS<x>/xmit_fi 77 What: /sys/class/tty/ttyS<x>/xmit_fifo_size
78 Date: October 2012 78 Date: October 2012
79 Contact: Alan Cox <alan@linux.intel.com> 79 Contact: Alan Cox <alan@linux.intel.com>
80 Description: 80 Description:
81 Show the transmit FIFO size f 81 Show the transmit FIFO size for this port.
82 82
83 These sysfs values expose the 83 These sysfs values expose the TIOCGSERIAL interface via
84 sysfs rather than via ioctls. 84 sysfs rather than via ioctls.
85 85
86 What: /sys/class/tty/ttyS<x>/close_d 86 What: /sys/class/tty/ttyS<x>/close_delay
87 Date: October 2012 87 Date: October 2012
88 Contact: Alan Cox <alan@linux.intel.com> 88 Contact: Alan Cox <alan@linux.intel.com>
89 Description: 89 Description:
90 Show the closing delay time fo 90 Show the closing delay time for this port in centiseconds.
91 91
92 These sysfs values expose the 92 These sysfs values expose the TIOCGSERIAL interface via
93 sysfs rather than via ioctls. 93 sysfs rather than via ioctls.
94 94
95 What: /sys/class/tty/ttyS<x>/closing 95 What: /sys/class/tty/ttyS<x>/closing_wait
96 Date: October 2012 96 Date: October 2012
97 Contact: Alan Cox <alan@linux.intel.com> 97 Contact: Alan Cox <alan@linux.intel.com>
98 Description: 98 Description:
99 Show the close wait time for t 99 Show the close wait time for this port in centiseconds.
100 100
101 Waiting forever is represented 101 Waiting forever is represented as 0. If waiting on close is
102 disabled then the value is 655 102 disabled then the value is 65535.
103 103
104 These sysfs values expose the 104 These sysfs values expose the TIOCGSERIAL interface via
105 sysfs rather than via ioctls. 105 sysfs rather than via ioctls.
106 106
107 What: /sys/class/tty/ttyS<x>/custom_ 107 What: /sys/class/tty/ttyS<x>/custom_divisor
108 Date: October 2012 108 Date: October 2012
109 Contact: Alan Cox <alan@linux.intel.com> 109 Contact: Alan Cox <alan@linux.intel.com>
110 Description: 110 Description:
111 Show the custom divisor if an 111 Show the custom divisor if any that is set on this port.
112 112
113 These sysfs values expose the 113 These sysfs values expose the TIOCGSERIAL interface via
114 sysfs rather than via ioctls. 114 sysfs rather than via ioctls.
115 115
116 What: /sys/class/tty/ttyS<x>/io_type 116 What: /sys/class/tty/ttyS<x>/io_type
117 Date: October 2012 117 Date: October 2012
118 Contact: Alan Cox <alan@linux.intel.com> 118 Contact: Alan Cox <alan@linux.intel.com>
119 Description: 119 Description:
120 Show the I/O type that is to 120 Show the I/O type that is to be used with the iomem base
121 address. 121 address.
122 122
123 These sysfs values expose the 123 These sysfs values expose the TIOCGSERIAL interface via
124 sysfs rather than via ioctls. 124 sysfs rather than via ioctls.
125 125
126 What: /sys/class/tty/ttyS<x>/iomem_b 126 What: /sys/class/tty/ttyS<x>/iomem_base
127 Date: October 2012 127 Date: October 2012
128 Contact: Alan Cox <alan@linux.intel.com> 128 Contact: Alan Cox <alan@linux.intel.com>
129 Description: 129 Description:
130 The I/O memory base for this 130 The I/O memory base for this port.
131 131
132 These sysfs values expose the 132 These sysfs values expose the TIOCGSERIAL interface via
133 sysfs rather than via ioctls. 133 sysfs rather than via ioctls.
134 134
135 What: /sys/class/tty/ttyS<x>/iomem_r 135 What: /sys/class/tty/ttyS<x>/iomem_reg_shift
136 Date: October 2012 136 Date: October 2012
137 Contact: Alan Cox <alan@linux.intel.com> 137 Contact: Alan Cox <alan@linux.intel.com>
138 Description: 138 Description:
139 Show the register shift indic 139 Show the register shift indicating the spacing to be used
140 for accesses on this iomem ad 140 for accesses on this iomem address.
141 141
142 These sysfs values expose the 142 These sysfs values expose the TIOCGSERIAL interface via
143 sysfs rather than via ioctls. 143 sysfs rather than via ioctls.
144 144
145 What: /sys/class/tty/ttyS<x>/rx_trig 145 What: /sys/class/tty/ttyS<x>/rx_trig_bytes
146 Date: May 2014 146 Date: May 2014
147 Contact: Yoshihiro YUNOMAE <yoshihiro.yu 147 Contact: Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@hitachi.com>
148 Description: 148 Description:
149 Shows current RX interrupt tr 149 Shows current RX interrupt trigger bytes or sets the
150 user specified value to chang 150 user specified value to change it for the FIFO buffer.
151 Users can show or set this va 151 Users can show or set this value regardless of opening the
152 serial device file or not. 152 serial device file or not.
153 153
154 The RX trigger can be set one 154 The RX trigger can be set one of four kinds of values for UART
155 serials. When users input a m 155 serials. When users input a meaning less value to this I/F,
156 the RX trigger is changed to 156 the RX trigger is changed to the nearest lower value for the
157 device specification. For exa 157 device specification. For example, when user sets 7bytes on
158 16550A, which has 1/4/8/14 by 158 16550A, which has 1/4/8/14 bytes trigger, the RX trigger is
159 automatically changed to 4 by 159 automatically changed to 4 bytes.
160 160
161 What: /sys/class/tty/ttyS<x>/console 161 What: /sys/class/tty/ttyS<x>/console
162 Date: February 2020 162 Date: February 2020
163 Contact: Andy Shevchenko <andriy.shevche 163 Contact: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
164 Description: 164 Description:
165 Allows user to detach or atta 165 Allows user to detach or attach back the given device as
166 kernel console. It shows and 166 kernel console. It shows and accepts a boolean variable.
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