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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| What: /dev/fw[0-9]+ | ||
| Date: May 2007 | ||
| KernelVersion: 2.6.22 | ||
| Contact: linux1394-devel@lists.sourceforge.net | ||
| Description: | ||
| The character device files /dev/fw* are the interface between | ||
| firewire-core and IEEE 1394 device drivers implemented in | ||
| userspace. The ioctl(2)- and read(2)-based ABI is defined and | ||
| documented in <linux/firewire-cdev.h>. | ||
|
|
||
| This ABI offers most of the features which firewire-core also | ||
| exposes to kernelspace IEEE 1394 drivers. | ||
|
|
||
| Each /dev/fw* is associated with one IEEE 1394 node, which can | ||
| be remote or local nodes. Operations on a /dev/fw* file have | ||
| different scope: | ||
| - The 1394 node which is associated with the file: | ||
| - Asynchronous request transmission | ||
| - Get the Configuration ROM | ||
| - Query node ID | ||
| - Query maximum speed of the path between this node | ||
| and local node | ||
| - The 1394 bus (i.e. "card") to which the node is attached to: | ||
| - Isochronous stream transmission and reception | ||
| - Asynchronous stream transmission and reception | ||
| - Asynchronous broadcast request transmission | ||
| - PHY packet transmission and reception | ||
| - Allocate, reallocate, deallocate isochronous | ||
| resources (channels, bandwidth) at the bus's IRM | ||
| - Query node IDs of local node, root node, IRM, bus | ||
| manager | ||
| - Query cycle time | ||
| - Bus reset initiation, bus reset event reception | ||
| - All 1394 buses: | ||
| - Allocation of IEEE 1212 address ranges on the local | ||
| link layers, reception of inbound requests to such | ||
| an address range, asynchronous response transmission | ||
| to inbound requests | ||
| - Addition of descriptors or directories to the local | ||
| nodes' Configuration ROM | ||
|
|
||
| Due to the different scope of operations and in order to let | ||
| userland implement different access permission models, some | ||
| operations are restricted to /dev/fw* files that are associated | ||
| with a local node: | ||
| - Addition of descriptors or directories to the local | ||
| nodes' Configuration ROM | ||
| - PHY packet transmission and reception | ||
|
|
||
| A /dev/fw* file remains associated with one particular node | ||
| during its entire life time. Bus topology changes, and hence | ||
| node ID changes, are tracked by firewire-core. ABI users do not | ||
| need to be aware of topology. | ||
|
|
||
| The following file operations are supported: | ||
|
|
||
| open(2) | ||
| Currently the only useful flags are O_RDWR. | ||
|
|
||
| ioctl(2) | ||
| Initiate various actions. Some take immediate effect, others | ||
| are performed asynchronously while or after the ioctl returns. | ||
| See the inline documentation in <linux/firewire-cdev.h> for | ||
| descriptions of all ioctls. | ||
|
|
||
| poll(2), select(2), epoll_wait(2) etc. | ||
| Watch for events to become available to be read. | ||
|
|
||
| read(2) | ||
| Receive various events. There are solicited events like | ||
| outbound asynchronous transaction completion or isochronous | ||
| buffer completion, and unsolicited events such as bus resets, | ||
| request reception, or PHY packet reception. Always use a read | ||
| buffer which is large enough to receive the largest event that | ||
| could ever arrive. See <linux/firewire-cdev.h> for descriptions | ||
| of all event types and for which ioctls affect reception of | ||
| events. | ||
|
|
||
| mmap(2) | ||
| Allocate a DMA buffer for isochronous reception or transmission | ||
| and map it into the process address space. The arguments should | ||
| be used as follows: addr = NULL, length = the desired buffer | ||
| size, i.e. number of packets times size of largest packet, | ||
| prot = at least PROT_READ for reception and at least PROT_WRITE | ||
| for transmission, flags = MAP_SHARED, fd = the handle to the | ||
| /dev/fw*, offset = 0. | ||
|
|
||
| Isochronous reception works in packet-per-buffer fashion except | ||
| for multichannel reception which works in buffer-fill mode. | ||
|
|
||
| munmap(2) | ||
| Unmap the isochronous I/O buffer from the process address space. | ||
|
|
||
| close(2) | ||
| Besides stopping and freeing I/O contexts that were associated | ||
| with the file descriptor, back out any changes to the local | ||
| nodes' Configuration ROM. Deallocate isochronous channels and | ||
| bandwidth at the IRM that were marked for kernel-assisted | ||
| re- and deallocation. | ||
|
|
||
| Users: libraw1394 | ||
| libdc1394 | ||
| tools like jujuutils, fwhack, ... |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,122 @@ | ||
| What: /sys/bus/firewire/devices/fw[0-9]+/ | ||
| Date: May 2007 | ||
| KernelVersion: 2.6.22 | ||
| Contact: linux1394-devel@lists.sourceforge.net | ||
| Description: | ||
| IEEE 1394 node device attributes. | ||
| Read-only. Mutable during the node device's lifetime. | ||
| See IEEE 1212 for semantic definitions. | ||
|
|
||
| config_rom | ||
| Contents of the Configuration ROM register. | ||
| Binary attribute; an array of host-endian u32. | ||
|
|
||
| guid | ||
| The node's EUI-64 in the bus information block of | ||
| Configuration ROM. | ||
| Hexadecimal string representation of an u64. | ||
|
|
||
|
|
||
| What: /sys/bus/firewire/devices/fw[0-9]+/units | ||
| Date: June 2009 | ||
| KernelVersion: 2.6.31 | ||
| Contact: linux1394-devel@lists.sourceforge.net | ||
| Description: | ||
| IEEE 1394 node device attribute. | ||
| Read-only. Mutable during the node device's lifetime. | ||
| See IEEE 1212 for semantic definitions. | ||
|
|
||
| units | ||
| Summary of all units present in an IEEE 1394 node. | ||
| Contains space-separated tuples of specifier_id and | ||
| version of each unit present in the node. Specifier_id | ||
| and version are hexadecimal string representations of | ||
| u24 of the respective unit directory entries. | ||
| Specifier_id and version within each tuple are separated | ||
| by a colon. | ||
|
|
||
| Users: udev rules to set ownership and access permissions or ACLs of | ||
| /dev/fw[0-9]+ character device files | ||
|
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||
|
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||
| What: /sys/bus/firewire/devices/fw[0-9]+[.][0-9]+/ | ||
| Date: May 2007 | ||
| KernelVersion: 2.6.22 | ||
| Contact: linux1394-devel@lists.sourceforge.net | ||
| Description: | ||
| IEEE 1394 unit device attributes. | ||
| Read-only. Immutable during the unit device's lifetime. | ||
| See IEEE 1212 for semantic definitions. | ||
|
|
||
| modalias | ||
| Same as MODALIAS in the uevent at device creation. | ||
|
|
||
| rom_index | ||
| Offset of the unit directory within the parent device's | ||
| (node device's) Configuration ROM, in quadlets. | ||
| Decimal string representation. | ||
|
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||
|
|
||
| What: /sys/bus/firewire/devices/*/ | ||
| Date: May 2007 | ||
| KernelVersion: 2.6.22 | ||
| Contact: linux1394-devel@lists.sourceforge.net | ||
| Description: | ||
| Attributes common to IEEE 1394 node devices and unit devices. | ||
| Read-only. Mutable during the node device's lifetime. | ||
| Immutable during the unit device's lifetime. | ||
| See IEEE 1212 for semantic definitions. | ||
|
|
||
| These attributes are only created if the root directory of an | ||
| IEEE 1394 node or the unit directory of an IEEE 1394 unit | ||
| actually contains according entries. | ||
|
|
||
| hardware_version | ||
| Hexadecimal string representation of an u24. | ||
|
|
||
| hardware_version_name | ||
| Contents of a respective textual descriptor leaf. | ||
|
|
||
| model | ||
| Hexadecimal string representation of an u24. | ||
|
|
||
| model_name | ||
| Contents of a respective textual descriptor leaf. | ||
|
|
||
| specifier_id | ||
| Hexadecimal string representation of an u24. | ||
| Mandatory in unit directories according to IEEE 1212. | ||
|
|
||
| vendor | ||
| Hexadecimal string representation of an u24. | ||
| Mandatory in the root directory according to IEEE 1212. | ||
|
|
||
| vendor_name | ||
| Contents of a respective textual descriptor leaf. | ||
|
|
||
| version | ||
| Hexadecimal string representation of an u24. | ||
| Mandatory in unit directories according to IEEE 1212. | ||
|
|
||
|
|
||
| What: /sys/bus/firewire/drivers/sbp2/fw*/host*/target*/*:*:*:*/ieee1394_id | ||
| formerly | ||
| /sys/bus/ieee1394/drivers/sbp2/fw*/host*/target*/*:*:*:*/ieee1394_id | ||
| Date: Feb 2004 | ||
| KernelVersion: 2.6.4 | ||
| Contact: linux1394-devel@lists.sourceforge.net | ||
| Description: | ||
| SCSI target port identifier and logical unit identifier of a | ||
| logical unit of an SBP-2 target. The identifiers are specified | ||
| in SAM-2...SAM-4 annex A. They are persistent and world-wide | ||
| unique properties the SBP-2 attached target. | ||
|
|
||
| Read-only attribute, immutable during the target's lifetime. | ||
| Format, as exposed by firewire-sbp2 since 2.6.22, May 2007: | ||
| Colon-separated hexadecimal string representations of | ||
| u64 EUI-64 : u24 directory_ID : u16 LUN | ||
| without 0x prefixes, without whitespace. The former sbp2 driver | ||
| (removed in 2.6.37 after being superseded by firewire-sbp2) used | ||
| a somewhat shorter format which was not as close to SAM. | ||
|
|
||
| Users: udev rules to create /dev/disk/by-id/ symlinks |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| On some architectures, when the kernel loads any userspace program it | ||
| maps an ELF DSO into that program's address space. This DSO is called | ||
| the vDSO and it often contains useful and highly-optimized alternatives | ||
| to real syscalls. | ||
|
|
||
| These functions are called just like ordinary C function according to | ||
| your platform's ABI. Call them from a sensible context. (For example, | ||
| if you set CS on x86 to something strange, the vDSO functions are | ||
| within their rights to crash.) In addition, if you pass a bad | ||
| pointer to a vDSO function, you might get SIGSEGV instead of -EFAULT. | ||
|
|
||
| To find the DSO, parse the auxiliary vector passed to the program's | ||
| entry point. The AT_SYSINFO_EHDR entry will point to the vDSO. | ||
|
|
||
| The vDSO uses symbol versioning; whenever you request a symbol from the | ||
| vDSO, specify the version you are expecting. | ||
|
|
||
| Programs that dynamically link to glibc will use the vDSO automatically. | ||
| Otherwise, you can use the reference parser in Documentation/vDSO/parse_vdso.c. | ||
|
|
||
| Unless otherwise noted, the set of symbols with any given version and the | ||
| ABI of those symbols is considered stable. It may vary across architectures, | ||
| though. | ||
|
|
||
| (As of this writing, this ABI documentation as been confirmed for x86_64. | ||
| The maintainers of the other vDSO-using architectures should confirm | ||
| that it is correct for their architecture.) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,21 @@ | ||
| What: /sys/bus/i2c/devices/.../device | ||
| Date: February 2011 | ||
| Contact: Minkyu Kang <mk7.kang@samsung.com> | ||
| Description: | ||
| show what device is attached | ||
| NONE - no device | ||
| USB - USB device is attached | ||
| UART - UART is attached | ||
| CHARGER - Charger is attaced | ||
| JIG - JIG is attached | ||
|
|
||
| What: /sys/bus/i2c/devices/.../switch | ||
| Date: February 2011 | ||
| Contact: Minkyu Kang <mk7.kang@samsung.com> | ||
| Description: | ||
| show or set the state of manual switch | ||
| VAUDIO - switch to VAUDIO path | ||
| UART - switch to UART path | ||
| AUDIO - switch to AUDIO path | ||
| DHOST - switch to DHOST path | ||
| AUTO - switch automatically by device |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,10 @@ | ||
| What: /sys/bus/hid/drivers/wiimote/<dev>/led1 | ||
| What: /sys/bus/hid/drivers/wiimote/<dev>/led2 | ||
| What: /sys/bus/hid/drivers/wiimote/<dev>/led3 | ||
| What: /sys/bus/hid/drivers/wiimote/<dev>/led4 | ||
| Date: July 2011 | ||
| KernelVersion: 3.1 | ||
| Contact: David Herrmann <dh.herrmann@googlemail.com> | ||
| Description: Make it possible to set/get current led state. Reading from it | ||
| returns 0 if led is off and 1 if it is on. Writing 0 to it | ||
| disables the led, writing 1 enables it. |
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