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| /Documentation/media/uapi/v4l/ |
| D | func-read.rst | 10 .. _func-read:
13 V4L2 read()
19 v4l2-read - Read from a V4L2 device
30 .. c:function:: ssize_t read( int fd, void *buf, size_t count )
31 :name: v4l2-read
43 Max number of bytes to read
48 :ref:`read() <func-read>` attempts to read up to ``count`` bytes from file
51 section, see ##. If ``count`` is zero, :ref:`read() <func-read>` returns zero
54 :ref:`read() <func-read>` call will provide at most one frame (two fields)
57 By default :ref:`read() <func-read>` blocks until data becomes available. When
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| /Documentation/ABI/testing/ |
| D | sysfs-platform-dfl-fme | 5 Description: Read-only. One DFL FPGA device may have more than 1
7 number of ports on the FPGA device when read it.
13 Description: Read-only. It returns Bitstream (static FPGA region)
21 Description: Read-only. It returns Bitstream (static FPGA region) meta
29 Description: Read-only. It returns cache size of this FPGA device.
35 Description: Read-only. It returns fabric version of this FPGA device.
43 Description: Read-only. It returns socket_id to indicate which socket
52 Description: Read-Write. Read this file for errors detected on pcie0 link.
61 Description: Read-Write. Read this file for errors detected on pcie1 link.
70 Description: Read-only. It returns non-fatal errors detected.
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| D | configfs-spear-pcie-gadget | 18 link ... used to enable ltssm and read its status.
19 int_type ...used to configure and read type of supported
22 to read no of MSI granted.
25 vendor_id ... used to write and read vendor id (hex)
26 device_id ... used to write and read device id (hex)
27 bar0_size ... used to write and read bar0_size
28 bar0_address ... used to write and read bar0 mapped area in hex.
29 bar0_rw_offset ... used to write and read offset of bar0 where
30 bar0_data will be written or read.
31 bar0_data ... used to write and read data at bar0_rw_offset.
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| D | sysfs-platform-dfl-port | 5 Description: Read-only. It returns id of this port. One DFL FPGA device
13 Description: Read-only. User can program different PR bitstreams to FPGA
22 Description: Read-only. It reports the APx (AFU Power) state, different APx
30 Description: Read-write. Read this file for AP1 (AFU Power State 1) event.
38 Description: Read-write. Read this file for AP2 (AFU Power State 2) event.
46 Description: Read-write. Read or set AFU latency tolerance reporting value.
61 Description: Read-only. Read this file to get the status of issued command
75 Description: Read-only. Read this file to get the status of issued command
82 Description: Read-Write. Read this file to get errors detected on port and
93 Description: Read-only. Read this file to get the first error detected by
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| D | sysfs-driver-ufs | 21 The file is read only.
29 The file is read only.
37 The file is read only.
46 The file is read only.
54 The file is read only.
63 The file is read only.
72 The file is read only.
78 descriptor could be read after partial initialization phase
82 The file is read only.
91 The file is read only.
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| D | sysfs-class-watchdog | 5 It is a read only file. It contains status of the watchdog
13 It is a read only file. It contains identity string of
20 It is a read only file. While reading, it gives '1' if that
27 It is a read only file. It gives active/inactive status of
34 It is a read only file. It contains watchdog device's
42 It is a read only file. It contains value of time left for
50 It is a read only file. It is read to know about current
57 It is a read only file. It specifies the time in seconds before
65 It is a read only file. It shows the pretimeout governors
72 It is a read/write file. When read, the currently assigned
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| D | sysfs-class-power | 9 Access: Read
18 Access: Read
27 Access: Read
36 Access: Read
46 Access: Read
60 Access: Read, Write
74 Access: Read, Write
83 Access: Read
95 Access: Read
104 Access: Read
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| D | sysfs-bus-coresight-devices-tmc | 15 The value is read directly from HW register RSZ, 0x004.
22 is read directly from HW register STS, 0x00C.
28 Description: (R) Shows the value held by the TMC RAM Read Pointer register
29 that is used to read entries from the Trace RAM over the APB
30 interface. The value is read directly from HW register RRP,
39 the CoreSight bus into the Trace RAM. The value is read directly
47 read directly from HW register TRG, 0x01C.
54 is read directly from HW register CTL, 0x020.
61 register. The value is read directly from HW register FFSR,
69 register. The value is read directly from HW register FFCR,
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| D | sysfs-class-switchtec | 19 (read only)
27 Description: Component revision stored in the hardware (read only)
36 (read only)
44 Description: Device version as stored in the hardware (read only)
52 Description: Currently running firmware version (read only)
60 Description: Partition number for this device in the switch (read only)
68 Description: Total number of partitions in the switch (read only)
77 (read only)
86 (read only)
95 (read only)
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| D | sysfs-class-ocxl | 4 Description: read only
6 Reflects what is read in the configuration space of the AFU
11 Description: read only
20 Description: read only
27 Description: read only
34 Description: read/write
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| D | sysfs-class-cxl | 12 Description: read only
23 Description: read/write
34 Description: read only
44 Description: read only
52 Description: read only
60 Description: read/write
70 Description: read/write
93 Description: read only
100 Description: read only
114 Description: read only
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| D | sysfs-bus-coresight-devices-etb10 | 24 2. The value is read directly from HW register RDP, 0x004.
31 is read directly from HW register STS, 0x00C.
37 Description: (R) Shows the value held by the ETB RAM Read Pointer register
38 that is used to read entries from the Trace RAM over the APB
39 interface. The value is read directly from HW register RRP,
48 the CoreSight bus into the Trace RAM. The value is read directly
56 read directly from HW register TRG, 0x01C.
63 is read directly from HW register CTL, 0x020.
70 register. The value is read directly from HW register FFSR,
78 register. The value is read directly from HW register FFCR,
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| D | configfs-usb-gadget-uvc | 15 All attributes read only:
49 All attributes read only:
68 All attributes read only:
90 All attributes read only:
116 All attributes read only:
150 All attributes read only:
169 All attributes read only,
174 read-only
178 read-only
180 ratio, read-only
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| D | sysfs-class-led-flash | 5 Description: read/write
17 Description: read only
25 Description: read/write
35 Description: read only
42 Description: read/write
46 On read 1 means that flash is currently strobing and 0 means
53 Description: read only
55 Flash faults are re-read after strobing the flash. Possible
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| D | sysfs-devices-lpss_ltr | 18 This attribute is read-only. If the device's runtime PM status
19 is not "active", attempts to read from this attribute cause
30 This attribute is read-only. If the device's runtime PM status
31 is not "active", attempts to read from this attribute cause
42 This attribute is read-only. If the device's runtime PM status
43 is not "active", attempts to read from this attribute cause
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| /Documentation/media/uapi/rc/ |
| D | lirc-read.rst | 10 .. _lirc-read:
13 LIRC read()
19 lirc-read - Read from a LIRC device
30 .. c:function:: ssize_t read( int fd, void *buf, size_t count )
31 :name: lirc-read
44 Max number of bytes to read
49 :ref:`read() <lirc-read>` attempts to read up to ``count`` bytes from file
51 :ref:`read() <lirc-read>` returns zero and has no other results. If ``count``
60 read from the chardev.
73 On success, the number of bytes read is returned. It is not an error if
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| /Documentation/admin-guide/ |
| D | ufs.rst | 20 default value, supported as read-only
24 supported as read-write
28 supported as read-write
35 supported as read-write
39 supported as read-write
43 supported as read-only
47 supported as read-only
51 supported as read-only
55 supported as read-only
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| /Documentation/block/ |
| D | stat.rst | 29 read I/Os requests number of read I/Os processed
30 read merges requests number of read I/Os merged with in-queue I/O
31 read sectors sectors number of sectors read
32 read ticks milliseconds total wait time for read requests
46 read I/Os, write I/Os, discard I/0s
51 read merges, write merges, discard merges
57 read sectors, write sectors, discard_sectors
60 These values count the number of sectors read from, written to, or
65 read ticks, write ticks, discard ticks
71 example, if 60 read requests wait for an average of 30 ms, the read_ticks
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| /Documentation/filesystems/ |
| D | spufs.txt | 34 tem calls like read(2) or write(2), but often support only a subset of
39 All files that support the read(2) operation also support readv(2) and
47 possible operations, e.g. read access on the wbox file.
58 read(2), pread(2), write(2), pwrite(2), lseek(2)
71 The first SPU to CPU communication mailbox. This file is read-only and
72 can be read in units of 32 bits. The file can only be used in non-
76 read(2)
77 If a count smaller than four is requested, read returns -1 and
80 When data has been read successfully, four bytes are placed in
86 the first mailbox file, but can be read in blocking I/O mode, and the
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| D | adfs.txt | 21 Owner read
23 Other read
32 Owner read -> -r--r--r--
34 Owner read and filetype UnixExec -> ---x--x--x
38 Other read -> -r--r--r--
40 Other read and filetype UnixExec -> ---x--x--x
44 Hence, with the default masks, if a file is owner read/write, and
54 wish that either read bits give read access to the file for all, but
74 type suffixes to be appended to file names read from a directory. If the
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| /Documentation/s390/ |
| D | monreader.rst | 2 Linux API for read access to z/VM Monitor Records
15 usable from user space and allows read access to the z/VM Monitor Records
129 The following file operations are supported: open, release, read, poll.
130 There are two alternative methods for reading: either non-blocking read in
131 conjunction with polling, or blocking read without polling. IOCTLs are not
134 Read:
154 <0 byte read>
160 <0 byte read>
165 read with a return value of 0 (0 byte read).
167 read successfully, including the closing 0 byte read. Therefore you should
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| /Documentation/hwmon/ |
| D | f71882fg.rst | 10 Addresses scanned: none, address read from Super I/O config space
18 Addresses scanned: none, address read from Super I/O config space
26 Addresses scanned: none, address read from Super I/O config space
34 Addresses scanned: none, address read from Super I/O config space
42 Addresses scanned: none, address read from Super I/O config space
50 Addresses scanned: none, address read from Super I/O config space
58 Addresses scanned: none, address read from Super I/O config space
66 Addresses scanned: none, address read from Super I/O config space
74 Addresses scanned: none, address read from Super I/O config space
82 Addresses scanned: none, address read from Super I/O config space
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| /Documentation/devicetree/bindings/mtd/ |
| D | jedec,spi-nor.txt | 10 be identified by the JEDEC READ ID opcode (0x9F).
52 JEDEC READ ID opcode (0x9F):
67 - m25p,fast-read : Use the "fast read" opcode to read data from the chip instead
68 of the usual "read" opcode. This opcode is not supported by
90 m25p,fast-read;
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| /Documentation/input/joydev/ |
| D | joystick-api.rst | 35 (JS_EVENT_INIT) that you can read to obtain the initial state of the
49 read (fd, &e, sizeof(e));
60 If the read is successful, it will return sizeof(e), unless you wanted to read
61 more than one event per read as described in section 3.1.
112 don't read a 0 when the joystick is ``dead``, or if it doesn't span the
152 If you open the device in blocking mode, a read will block (that is,
153 wait) forever until an event is generated and effectively read. There
157 a) use select to wait until there's data to be read on fd, or
167 If read returns -1 when reading in O_NONBLOCK mode, this isn't
169 are no events pending to be read on the driver queue. You should read
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| /Documentation/devicetree/bindings/memory-controllers/ |
| D | ti-aemif.txt | 99 between a read followed by read or a write
102 - ti,cs-read-setup-ns: read setup width, ns
104 and the activation of read strobe.
107 - ti,cs-read-strobe-ns: read strobe width, ns
109 the read strobe.
112 - ti,cs-read-hold-ns: read hold width, ns
113 Time between the deactivation of the read
166 ti,cs-read-hold-ns = <7>;
167 ti,cs-read-strobe-ns = <42>;
168 ti,cs-read-setup-ns = <14>;
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