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usb: gadget: f_uac2: allow changing terminal types through configfs
[linux-2.6-block.git] / Documentation / ABI / testing / sysfs-class-backlight
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MK		 1What: /sys/class/backlight/<backlight>/scale
2Date: July 2019
3KernelVersion: 5.4
4Contact: Daniel Thompson <daniel.thompson@linaro.org>
5Description:
6 Description of the scale of the brightness curve.
7
8 The human eye senses brightness approximately logarithmically,
9 hence linear changes in brightness are perceived as being
10 non-linear. To achieve a linear perception of brightness changes
11 controls like sliders need to apply a logarithmic mapping for
12 backlights with a linear brightness curve.
13
14 Possible values of the attribute are:
15
16 unknown
17 The scale of the brightness curve is unknown.
18
19 linear
20 The brightness changes linearly with each step. Brightness
21 controls should apply a logarithmic mapping for a linear
22 perception.
23
24 non-linear
25 The brightness changes non-linearly with each step. Brightness
26 controls should use a linear mapping for a linear perception.
bd6e8441
MCC		 27
28What: /sys/class/backlight/<backlight>/ambient_light_level
29Date: Apr, 2010
30KernelVersion: v2.6.35
31Contact: Michael Hennerich <michael.hennerich@analog.com>
32Description:
33 (RO) Get conversion value of the light sensor.
34
35 The value is automatically updated every 80 ms when the
36 light sensor is enabled.
37
38 The value range is device-driver specific:
39
40 For ADP8870:
41
42 It returns integer between 0 (dark) and 8000 (max ambient
43 brightness).
44
45 For ADP8860:
46
47 It returns a 13-bits integer.
48
49What: /sys/class/backlight/<backlight>/ambient_light_zone
50Date: Apr, 2010
51KernelVersion: v2.6.35
52Contact: Michael Hennerich <michael.hennerich@analog.com>,
53 device-drivers-devel@blackfin.uclinux.org
54
55Description:
56 (RW) Read or write the specific brightness level at which the
57 backlight operates.
58
59 The value meaning is device-driver specific:
60
61 For ADP8860:
62
63 == ==========================
64 0 Off: Backlight set to 0 mA
65 1 Level 1: daylight
66 2 Level 2: bright
67 3 Level 3: dark
68 == ==========================
69
70 For ADP8870:
71
72 == ==========================
73 0 Off: Backlight set to 0 mA
74 1 Level 1: daylight
75 2 Level 2: bright
76 3 Level 3: office
77 4 Level 4: indoor
78 5 Level 5: dark
79 == ==========================
80
81 Writing 0 returns to normal/automatic ambient light level
82 operation.
83
84 It can be enabled by writing the value stored in
85 /sys/class/backlight/<backlight>/max_brightness to
86 /sys/class/backlight/<backlight>/brightness.
13d6f967
MCC		 87
88What: /sys/class/backlight/<backlight>/<ambient light zone>_max
89Date: Sep, 2009
90KernelVersion: v2.6.32
91Contact: device-drivers-devel@blackfin.uclinux.org
92Description:
93 Control the maximum brightness for <ambient light zone>
94 on this <backlight>. Values are between 0 and 127. This file
95 will also show the brightness level stored for this
96 <ambient light zone>.
97
98 The <ambient light zone> is device-driver specific:
99
100 For ADP5520 and ADP5501, <ambient light zone> can be:
101
102 =========== ================================================
103 Ambient sysfs entry
104 light zone
105 =========== ================================================
106 daylight /sys/class/backlight/<backlight>/daylight_max
107 office /sys/class/backlight/<backlight>/office_max
108 dark /sys/class/backlight/<backlight>/dark_max
109 =========== ================================================
110
111 For ADP8860, <ambient light zone> can be:
112
113 =========== ================================================
114 Ambient sysfs entry
115 light zone
116 =========== ================================================
117 l1_daylight /sys/class/backlight/<backlight>/l1_daylight_max
118 l2_office /sys/class/backlight/<backlight>/l2_office_max
119 l3_dark /sys/class/backlight/<backlight>/l3_dark_max
120 =========== ================================================
121
122 For ADP8870, <ambient light zone> can be:
123
124 =========== ================================================
125 Ambient sysfs entry
126 light zone
127 =========== ================================================
128 l1_daylight /sys/class/backlight/<backlight>/l1_daylight_max
129 l2_bright /sys/class/backlight/<backlight>/l2_bright_max
130 l3_office /sys/class/backlight/<backlight>/l3_office_max
131 l4_indoor /sys/class/backlight/<backlight>/l4_indoor_max
132 l5_dark /sys/class/backlight/<backlight>/l5_dark_max
133 =========== ================================================
134
135 See also: /sys/class/backlight/<backlight>/ambient_light_zone.
136
137What: /sys/class/backlight/<backlight>/<ambient light zone>_dim
138Date: Sep, 2009
139KernelVersion: v2.6.32
140Contact: device-drivers-devel@blackfin.uclinux.org
141Description:
142 Control the dim brightness for <ambient light zone>
143 on this <backlight>. Values are between 0 and 127, typically
144 set to 0. Full off when the backlight is disabled.
145 This file will also show the dim brightness level stored for
146 this <ambient light zone>.
147
148 The <ambient light zone> is device-driver specific:
149
150 For ADP5520 and ADP5501, <ambient light zone> can be:
151
152 =========== ================================================
153 Ambient sysfs entry
154 light zone
155 =========== ================================================
156 daylight /sys/class/backlight/<backlight>/daylight_dim
157 office /sys/class/backlight/<backlight>/office_dim
158 dark /sys/class/backlight/<backlight>/dark_dim
159 =========== ================================================
160
161 For ADP8860, <ambient light zone> can be:
162
163 =========== ================================================
164 Ambient sysfs entry
165 light zone
166 =========== ================================================
167 l1_daylight /sys/class/backlight/<backlight>/l1_daylight_dim
168 l2_office /sys/class/backlight/<backlight>/l2_office_dim
169 l3_dark /sys/class/backlight/<backlight>/l3_dark_dim
170 =========== ================================================
171
172 For ADP8870, <ambient light zone> can be:
173
174 =========== ================================================
175 Ambient sysfs entry
176 light zone
177 =========== ================================================
178 l1_daylight /sys/class/backlight/<backlight>/l1_daylight_dim
179 l2_bright /sys/class/backlight/<backlight>/l2_bright_dim
180 l3_office /sys/class/backlight/<backlight>/l3_office_dim
181 l4_indoor /sys/class/backlight/<backlight>/l4_indoor_dim
182 l5_dark /sys/class/backlight/<backlight>/l5_dark_dim
183 =========== ================================================
184
185 See also: /sys/class/backlight/<backlight>/ambient_light_zone.
186
Linux 6.x block layer and io_uring tree(s)