diff options
Diffstat (limited to 'Documentation/ABI/obsolete')
| -rw-r--r-- | Documentation/ABI/obsolete/sysfs-class-rfkill | 29 | ||||
| -rw-r--r-- | Documentation/ABI/obsolete/sysfs-gpio | 30 |
2 files changed, 30 insertions, 29 deletions
diff --git a/Documentation/ABI/obsolete/sysfs-class-rfkill b/Documentation/ABI/obsolete/sysfs-class-rfkill deleted file mode 100644 index ff60ad9eca4c..000000000000 --- a/Documentation/ABI/obsolete/sysfs-class-rfkill +++ /dev/null @@ -1,29 +0,0 @@ -rfkill - radio frequency (RF) connector kill switch support - -For details to this subsystem look at Documentation/rfkill.txt. - -What: /sys/class/rfkill/rfkill[0-9]+/state -Date: 09-Jul-2007 -KernelVersion v2.6.22 -Contact: linux-wireless@vger.kernel.org -Description: Current state of the transmitter. - This file is deprecated and scheduled to be removed in 2014, - because its not possible to express the 'soft and hard block' - state of the rfkill driver. -Values: A numeric value. - 0: RFKILL_STATE_SOFT_BLOCKED - transmitter is turned off by software - 1: RFKILL_STATE_UNBLOCKED - transmitter is (potentially) active - 2: RFKILL_STATE_HARD_BLOCKED - transmitter is forced off by something outside of - the driver's control. - -What: /sys/class/rfkill/rfkill[0-9]+/claim -Date: 09-Jul-2007 -KernelVersion v2.6.22 -Contact: linux-wireless@vger.kernel.org -Description: This file is deprecated because there no longer is a way to - claim just control over a single rfkill instance. - This file is scheduled to be removed in 2012. -Values: 0: Kernel handles events diff --git a/Documentation/ABI/obsolete/sysfs-gpio b/Documentation/ABI/obsolete/sysfs-gpio new file mode 100644 index 000000000000..867c1fab20e2 --- /dev/null +++ b/Documentation/ABI/obsolete/sysfs-gpio @@ -0,0 +1,30 @@ +What: /sys/class/gpio/ +Date: July 2008 +KernelVersion: 2.6.27 +Contact: Linus Walleij <linusw@kernel.org> +Description: + + As a Kconfig option, individual GPIO signals may be accessed from + userspace. GPIOs are only made available to userspace by an explicit + "export" operation. If a given GPIO is not claimed for use by + kernel code, it may be exported by userspace (and unexported later). + Kernel code may export it for complete or partial access. + + GPIOs are identified as they are inside the kernel, using integers in + the range 0..INT_MAX. See Documentation/gpio.txt for more information. + + /sys/class/gpio + /export ... asks the kernel to export a GPIO to userspace + /unexport ... to return a GPIO to the kernel + /gpioN ... for each exported GPIO #N OR + /<LINE-NAME> ... for a properly named GPIO line + /value ... always readable, writes fail for input GPIOs + /direction ... r/w as: in, out (default low); write: high, low + /edge ... r/w as: none, falling, rising, both + /gpiochipN ... for each gpiochip; #N is its first GPIO + /base ... (r/o) same as N + /label ... (r/o) descriptive, not necessarily unique + /ngpio ... (r/o) number of GPIOs; numbered N to N + (ngpio - 1) + + This ABI is deprecated and will be removed after 2020. It is + replaced with the GPIO character device. |