| /Linux-v5.4/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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| /Linux-v5.4/arch/arm/mach-pxa/include/mach/ |
| D | regs-uart.h | 11 #define FFRBR __REG(0x40100000) /* Receive Buffer Register (read only) */
13 #define FFIER __REG(0x40100004) /* Interrupt Enable Register (read/write) */
14 #define FFIIR __REG(0x40100008) /* Interrupt ID Register (read only) */
16 #define FFLCR __REG(0x4010000C) /* Line Control Register (read/write) */
17 #define FFMCR __REG(0x40100010) /* Modem Control Register (read/write) */
18 #define FFLSR __REG(0x40100014) /* Line Status Register (read only) */
19 #define FFMSR __REG(0x40100018) /* Modem Status Register (read only) */
20 #define FFSPR __REG(0x4010001C) /* Scratch Pad Register (read/write) */
21 #define FFISR __REG(0x40100020) /* Infrared Selection Register (read/write) */
22 #define FFDLL __REG(0x40100000) /* Divisor Latch Low Register (DLAB = 1) (read/write) */
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| /Linux-v5.4/drivers/media/usb/gspca/ |
| D | spca508.c | 67 /* READ {0x0000, 0x8114} -> 0000: 00 */
91 /* READ { 0x0001, 0x8803 } -> 0000: 00 */
92 /* READ { 0x0001, 0x8802 } -> 0000: 08 */
96 /* READ { 0x0001, 0x8803 } -> 0000: 00 */
97 /* READ { 0x0001, 0x8803 } -> 0000: 00 */
98 /* READ { 0x0001, 0x8802 } -> 0000: 08 */
102 /* READ { 0x0001, 0x8803 } -> 0000: 00 */
103 /* READ { 0x0001, 0x8803 } -> 0000: 00 */
104 /* READ { 0x0001, 0x8802 } -> 0000: 08 */
108 /* READ { 0x0001, 0x8803 } -> 0000: 00 */
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| /Linux-v5.4/sound/firewire/dice/ |
| D | dice-interface.h | 10 * Generally, all registers can be read like memory, i.e., with quadlet read or
11 * block read transactions with at least quadlet-aligned offset and length.
32 * size values are measured in quadlets. Read-only.
60 * A bitmask with asynchronous events; read-only. When any event(s) happen,
77 * A name that can be customized for each device; read/write. Padded with zero
85 * The current sample rate and clock source; read/write. Whether a clock
120 * Enable streaming; read/write. Writing a non-zero value (re)starts all
128 * Status of the sample clock; read-only.
137 * Status of all clock sources; read-only.
157 * error occurred since the last time when this register was read with
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| /Linux-v5.4/Documentation/ABI/testing/ |
| 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-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 | 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-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 | 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-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-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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| /Linux-v5.4/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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| /Linux-v5.4/tools/testing/selftests/kvm/lib/ |
| D | io.c | 82 /* Test Read
84 * A wrapper for read(2), that automatically handles the following
88 * + Read of less than requested amount
91 * For each of the above, an additional read is performed to automatically
93 * There are also many cases where read(2) can return an unexpected
96 * contains at least the number of requested bytes to be read. A TEST_ASSERT
98 * data is read. It is the callers responsibility to assure that sufficient
101 * Note, for function signature compatibility with read(2), this function
102 * returns the number of bytes read, but that value will always be equal
105 * read(2) or cause a TEST_ASSERT failure.
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| /Linux-v5.4/arch/parisc/kernel/ |
| D | perf_asm.S | 91 ;* arg0 : rdr to be read
98 ;* arg0 : rdr to be read
114 ; read(shift in) the RDR.
173 ; RDR 2 read sequence
185 ; RDR 3 read sequence
197 ; RDR 4 read sequence
209 ; RDR 5 read sequence
221 ; RDR 6 read sequence
233 ; RDR 7 read sequence
245 ; RDR 8 read sequence
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| /Linux-v5.4/drivers/rtc/ |
| D | rtc-ds1685.c | 34 /* Standard read/write functions if platform does not provide overrides */
37 * ds1685_read - read a value from an rtc register.
39 * @reg: the register address to read.
130 (rtc->read(rtc, RTC_CTRL_A) & ~(RTC_CTRL_A_DV0))); in ds1685_rtc_switch_to_bank0()
141 (rtc->read(rtc, RTC_CTRL_A) | RTC_CTRL_A_DV0)); in ds1685_rtc_switch_to_bank1()
153 * is read again in a loop until INCR is inactive.
162 (rtc->read(rtc, RTC_CTRL_B) | RTC_CTRL_B_SET)); in ds1685_rtc_begin_data_access()
164 /* Read Ext Ctrl 4A and check the INCR bit to avoid a lockout. */ in ds1685_rtc_begin_data_access()
165 while (rtc->read(rtc, RTC_EXT_CTRL_4A) & RTC_CTRL_4A_INCR) in ds1685_rtc_begin_data_access()
188 (rtc->read(rtc, RTC_CTRL_B) & ~(RTC_CTRL_B_SET))); in ds1685_rtc_end_data_access()
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| /Linux-v5.4/include/uapi/linux/ |
| D | virtio_pci.h | 69 * a read-and-acknowledge. */
137 __le32 device_feature_select; /* read-write */
138 __le32 device_feature; /* read-only */
139 __le32 guest_feature_select; /* read-write */
140 __le32 guest_feature; /* read-write */
141 __le16 msix_config; /* read-write */
142 __le16 num_queues; /* read-only */
143 __u8 device_status; /* read-write */
144 __u8 config_generation; /* read-only */
147 __le16 queue_select; /* read-write */
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| /Linux-v5.4/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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| /Linux-v5.4/tools/perf/pmu-events/arch/arm64/ |
| D | armv8-recommended.json | 3 "PublicDescription": "Attributable Level 1 data cache access, read",
6 "BriefDescription": "L1D cache access, read"
15 "PublicDescription": "Attributable Level 1 data cache refill, read",
18 "BriefDescription": "L1D cache refill, read"
57 "PublicDescription": "Attributable Level 1 data TLB refill, read",
60 "BriefDescription": "L1D tlb refill, read"
69 "PublicDescription": "Attributable Level 1 data or unified TLB access, read",
72 "BriefDescription": "L1D tlb access, read"
81 "PublicDescription": "Attributable Level 2 data cache access, read",
84 "BriefDescription": "L2D cache access, read"
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| /Linux-v5.4/arch/arm/mach-sa1100/include/mach/ |
| D | SA-1100.h | 81 * Controller (UDC) Control Register (read/write).
83 * Controller (UDC) Address Register (read/write).
86 * (read/write).
89 * (read/write).
92 * (read/write).
95 * (output, read/write).
98 * (input, read/write).
101 * (read/write).
104 * (read).
106 * Controller (UDC) Data Register (read/write).
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| /Linux-v5.4/drivers/net/ethernet/intel/ice/ |
| D | ice_nvm.c | 11 * @length: length of the section to be read (in bytes from the offset)
16 * Read the NVM using the admin queue commands (0x0701)
79 * ice_read_sr_aq - Read Shadow RAM.
82 * @words: number of words to read
110 * @offset: offset of the Shadow RAM word to read (0x000000 - 0x001FFF)
111 * @data: word read from the Shadow RAM
130 * @offset: offset of the Shadow RAM word to read (0x000000 - 0x001FFF)
131 * @words: (in) number of words to read; (out) number of words actually read
132 * @data: words read from the Shadow RAM
149 /* Calculate number of bytes we should read in this step. in ice_read_sr_buf_aq()
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| /Linux-v5.4/drivers/staging/comedi/drivers/ |
| D | pcl730.c | 40 * offset to the (*insn_bits) functions to read/write the correct
45 * BASE+0 Isolated outputs 0-7 (write) / inputs 0-7 (read)
46 * BASE+1 Isolated outputs 8-15 (write) / inputs 8-15 (read)
47 * BASE+2 TTL outputs 0-7 (write) / inputs 0-7 (read)
48 * BASE+3 TTL outputs 8-15 (write) / inputs 8-15 (read)
54 * BASE+0 Isolated outputs 0-7 (write) (read back on p8r8dio)
55 * BASE+1 Isolated inputs 0-7 (read)
59 * BASE+0 Isolated outputs 0-7 (write) (read back)
60 * BASE+1 Isolated outputs 8-15 (write) (read back)
61 * BASE+2 Isolated inputs 0-7 (read)
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| /Linux-v5.4/tools/perf/pmu-events/arch/x86/skylakex/ |
| D | uncore-memory.json | 3 "BriefDescription": "read requests to memory controller. Derived from unc_m_cas_count.rd",
82 …mmands are issued to open up a page on the DRAM devices so that it can be read or written to with …
92 …read or write on DRAM, so this event increments for every read and write. This event counts whethe…
97 "BriefDescription": "read requests to memory controller. Derived from unc_m_cas_count.rd",
107 "BriefDescription": "All DRAM Read CAS Commands issued (does not include underfills) ",
112 …read commands issued to DRAM on a per channel basis. CAS commands are issued to specify the addre…
117 "BriefDescription": "DRAM Underfill Read CAS Commands issued",
122 …underfill read commands issued to DRAM due to a partial write, on a per channel basis. CAS comman…
137 "BriefDescription": "Read Pending Queue Allocations",
142 …read requests allocated into the Read Pending Queue (RPQ). This queue is used to schedule reads o…
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| /Linux-v5.4/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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| /Linux-v5.4/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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| /Linux-v5.4/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
|
