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authorLinus Torvalds <torvalds@linux-foundation.org>2011-03-16 23:05:40 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2011-03-16 23:05:40 +0100
commita5e6b135bdff649e4330f98e2e80dbb1984f7e77 (patch)
tree475bfb1163c59d1370fd77415255afba768f9520 /Documentation/ABI/testing
parentMerge branch 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/greg... (diff)
parentprintk: do not mangle valid userspace syslog prefixes (diff)
downloadlinux-a5e6b135bdff649e4330f98e2e80dbb1984f7e77.tar.xz
linux-a5e6b135bdff649e4330f98e2e80dbb1984f7e77.zip
Merge branch 'driver-core-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6
* 'driver-core-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6: (50 commits) printk: do not mangle valid userspace syslog prefixes efivars: Add Documentation efivars: Expose efivars functionality to external drivers. efivars: Parameterize operations. efivars: Split out variable registration efivars: parameterize efivars efivars: Make efivars bin_attributes dynamic efivars: move efivars globals into struct efivars drivers:misc: ti-st: fix debugging code kref: Fix typo in kref documentation UIO: add PRUSS UIO driver support Fix spelling mistakes in Documentation/zh_CN/SubmittingPatches firmware: Fix unaligned memory accesses in dmi-sysfs firmware: Add documentation for /sys/firmware/dmi firmware: Expose DMI type 15 System Event Log firmware: Break out system_event_log in dmi-sysfs firmware: Basic dmi-sysfs support firmware: Add DMI entry types to the headers Driver core: convert platform_{get,set}_drvdata to static inline functions Translate linux-2.6/Documentation/magic-number.txt into Chinese ...
Diffstat (limited to 'Documentation/ABI/testing')
-rw-r--r--Documentation/ABI/testing/sysfs-firmware-dmi110
-rw-r--r--Documentation/ABI/testing/sysfs-platform-kim48
2 files changed, 158 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-firmware-dmi b/Documentation/ABI/testing/sysfs-firmware-dmi
new file mode 100644
index 000000000000..ba9da9503c23
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-firmware-dmi
@@ -0,0 +1,110 @@
+What: /sys/firmware/dmi/
+Date: February 2011
+Contact: Mike Waychison <mikew@google.com>
+Description:
+ Many machines' firmware (x86 and ia64) export DMI /
+ SMBIOS tables to the operating system. Getting at this
+ information is often valuable to userland, especially in
+ cases where there are OEM extensions used.
+
+ The kernel itself does not rely on the majority of the
+ information in these tables being correct. It equally
+ cannot ensure that the data as exported to userland is
+ without error either.
+
+ DMI is structured as a large table of entries, where
+ each entry has a common header indicating the type and
+ length of the entry, as well as 'handle' that is
+ supposed to be unique amongst all entries.
+
+ Some entries are required by the specification, but many
+ others are optional. In general though, users should
+ never expect to find a specific entry type on their
+ system unless they know for certain what their firmware
+ is doing. Machine to machine will vary.
+
+ Multiple entries of the same type are allowed. In order
+ to handle these duplicate entry types, each entry is
+ assigned by the operating system an 'instance', which is
+ derived from an entry type's ordinal position. That is
+ to say, if there are 'N' multiple entries with the same type
+ 'T' in the DMI tables (adjacent or spread apart, it
+ doesn't matter), they will be represented in sysfs as
+ entries "T-0" through "T-(N-1)":
+
+ Example entry directories:
+
+ /sys/firmware/dmi/entries/17-0
+ /sys/firmware/dmi/entries/17-1
+ /sys/firmware/dmi/entries/17-2
+ /sys/firmware/dmi/entries/17-3
+ ...
+
+ Instance numbers are used in lieu of the firmware
+ assigned entry handles as the kernel itself makes no
+ guarantees that handles as exported are unique, and
+ there are likely firmware images that get this wrong in
+ the wild.
+
+ Each DMI entry in sysfs has the common header values
+ exported as attributes:
+
+ handle : The 16bit 'handle' that is assigned to this
+ entry by the firmware. This handle may be
+ referred to by other entries.
+ length : The length of the entry, as presented in the
+ entry itself. Note that this is _not the
+ total count of bytes associated with the
+ entry_. This value represents the length of
+ the "formatted" portion of the entry. This
+ "formatted" region is sometimes followed by
+ the "unformatted" region composed of nul
+ terminated strings, with termination signalled
+ by a two nul characters in series.
+ raw : The raw bytes of the entry. This includes the
+ "formatted" portion of the entry, the
+ "unformatted" strings portion of the entry,
+ and the two terminating nul characters.
+ type : The type of the entry. This value is the same
+ as found in the directory name. It indicates
+ how the rest of the entry should be
+ interpreted.
+ instance: The instance ordinal of the entry for the
+ given type. This value is the same as found
+ in the parent directory name.
+ position: The position of the entry within the entirety
+ of the entirety.
+
+ === Entry Specialization ===
+
+ Some entry types may have other information available in
+ sysfs.
+
+ --- Type 15 - System Event Log ---
+
+ This entry allows the firmware to export a log of
+ events the system has taken. This information is
+ typically backed by nvram, but the implementation
+ details are abstracted by this table. This entries data
+ is exported in the directory:
+
+ /sys/firmware/dmi/entries/15-0/system_event_log
+
+ and has the following attributes (documented in the
+ SMBIOS / DMI specification under "System Event Log (Type 15)":
+
+ area_length
+ header_start_offset
+ data_start_offset
+ access_method
+ status
+ change_token
+ access_method_address
+ header_format
+ per_log_type_descriptor_length
+ type_descriptors_supported_count
+
+ As well, the kernel exports the binary attribute:
+
+ raw_event_log : The raw binary bits of the event log
+ as described by the DMI entry.
diff --git a/Documentation/ABI/testing/sysfs-platform-kim b/Documentation/ABI/testing/sysfs-platform-kim
new file mode 100644
index 000000000000..c1653271872a
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-platform-kim
@@ -0,0 +1,48 @@
+What: /sys/devices/platform/kim/dev_name
+Date: January 2010
+KernelVersion: 2.6.38
+Contact: "Pavan Savoy" <pavan_savoy@ti.com>
+Description:
+ Name of the UART device at which the WL128x chip
+ is connected. example: "/dev/ttyS0".
+ The device name flows down to architecture specific board
+ initialization file from the SFI/ATAGS bootloader
+ firmware. The name exposed is read from the user-space
+ dameon and opens the device when install is requested.
+
+What: /sys/devices/platform/kim/baud_rate
+Date: January 2010
+KernelVersion: 2.6.38
+Contact: "Pavan Savoy" <pavan_savoy@ti.com>
+Description:
+ The maximum reliable baud-rate the host can support.
+ Different platforms tend to have different high-speed
+ UART configurations, so the baud-rate needs to be set
+ locally and also sent across to the WL128x via a HCI-VS
+ command. The entry is read and made use by the user-space
+ daemon when the ldisc install is requested.
+
+What: /sys/devices/platform/kim/flow_cntrl
+Date: January 2010
+KernelVersion: 2.6.38
+Contact: "Pavan Savoy" <pavan_savoy@ti.com>
+Description:
+ The WL128x makes use of flow control mechanism, and this
+ entry most often should be 1, the host's UART is required
+ to have the capability of flow-control, or else this
+ entry can be made use of for exceptions.
+
+What: /sys/devices/platform/kim/install
+Date: January 2010
+KernelVersion: 2.6.38
+Contact: "Pavan Savoy" <pavan_savoy@ti.com>
+Description:
+ When one of the protocols Bluetooth, FM or GPS wants to make
+ use of the shared UART transport, it registers to the shared
+ transport driver, which will signal the user-space for opening,
+ configuring baud and install line discipline via this sysfs
+ entry. This entry would be polled upon by the user-space
+ daemon managing the UART, and is notified about the change
+ by the sysfs_notify. The value would be '1' when UART needs
+ to be opened/ldisc installed, and would be '0' when UART
+ is no more required and needs to be closed.