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 ms.
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 ms.
100 100
101 Waiting forever is represented !! 101 These sysfs values expose the TIOCGSERIAL interface via
102 disabled then the value is 655 !! 102 sysfs rather than via ioctls.
103 <<
104 These sysfs values expose the <<
105 sysfs rather than via ioctls. <<
106 103
107 What: /sys/class/tty/ttyS<x>/custom_ 104 What: /sys/class/tty/ttyS<x>/custom_divisor
108 Date: October 2012 105 Date: October 2012
109 Contact: Alan Cox <alan@linux.intel.com> 106 Contact: Alan Cox <alan@linux.intel.com>
110 Description: 107 Description:
111 Show the custom divisor if an 108 Show the custom divisor if any that is set on this port.
112 109
113 These sysfs values expose the 110 These sysfs values expose the TIOCGSERIAL interface via
114 sysfs rather than via ioctls. 111 sysfs rather than via ioctls.
115 112
116 What: /sys/class/tty/ttyS<x>/io_type 113 What: /sys/class/tty/ttyS<x>/io_type
117 Date: October 2012 114 Date: October 2012
118 Contact: Alan Cox <alan@linux.intel.com> 115 Contact: Alan Cox <alan@linux.intel.com>
119 Description: 116 Description:
120 Show the I/O type that is to 117 Show the I/O type that is to be used with the iomem base
121 address. 118 address.
122 119
123 These sysfs values expose the 120 These sysfs values expose the TIOCGSERIAL interface via
124 sysfs rather than via ioctls. 121 sysfs rather than via ioctls.
125 122
126 What: /sys/class/tty/ttyS<x>/iomem_b 123 What: /sys/class/tty/ttyS<x>/iomem_base
127 Date: October 2012 124 Date: October 2012
128 Contact: Alan Cox <alan@linux.intel.com> 125 Contact: Alan Cox <alan@linux.intel.com>
129 Description: 126 Description:
130 The I/O memory base for this 127 The I/O memory base for this port.
131 128
132 These sysfs values expose the 129 These sysfs values expose the TIOCGSERIAL interface via
133 sysfs rather than via ioctls. 130 sysfs rather than via ioctls.
134 131
135 What: /sys/class/tty/ttyS<x>/iomem_r 132 What: /sys/class/tty/ttyS<x>/iomem_reg_shift
136 Date: October 2012 133 Date: October 2012
137 Contact: Alan Cox <alan@linux.intel.com> 134 Contact: Alan Cox <alan@linux.intel.com>
138 Description: 135 Description:
139 Show the register shift indic 136 Show the register shift indicating the spacing to be used
140 for accesses on this iomem ad 137 for accesses on this iomem address.
141 138
142 These sysfs values expose the 139 These sysfs values expose the TIOCGSERIAL interface via
143 sysfs rather than via ioctls. 140 sysfs rather than via ioctls.
144 141
145 What: /sys/class/tty/ttyS<x>/rx_trig 142 What: /sys/class/tty/ttyS<x>/rx_trig_bytes
146 Date: May 2014 143 Date: May 2014
147 Contact: Yoshihiro YUNOMAE <yoshihiro.yu 144 Contact: Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@hitachi.com>
148 Description: 145 Description:
149 Shows current RX interrupt tr 146 Shows current RX interrupt trigger bytes or sets the
150 user specified value to chang 147 user specified value to change it for the FIFO buffer.
151 Users can show or set this va 148 Users can show or set this value regardless of opening the
152 serial device file or not. 149 serial device file or not.
153 150
154 The RX trigger can be set one 151 The RX trigger can be set one of four kinds of values for UART
155 serials. When users input a m 152 serials. When users input a meaning less value to this I/F,
156 the RX trigger is changed to 153 the RX trigger is changed to the nearest lower value for the
157 device specification. For exa 154 device specification. For example, when user sets 7bytes on
158 16550A, which has 1/4/8/14 by 155 16550A, which has 1/4/8/14 bytes trigger, the RX trigger is
159 automatically changed to 4 by 156 automatically changed to 4 bytes.
160 157
161 What: /sys/class/tty/ttyS<x>/console 158 What: /sys/class/tty/ttyS<x>/console
162 Date: February 2020 159 Date: February 2020
163 Contact: Andy Shevchenko <andriy.shevche 160 Contact: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
164 Description: 161 Description:
165 Allows user to detach or atta 162 Allows user to detach or attach back the given device as
166 kernel console. It shows and 163 kernel console. It shows and accepts a boolean variable.
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