A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-31 12:10:52 -04:00
Code Issues Projects Releases Packages Wiki Activity

tty/serial: Add GPIOLIB helpers for controlling modem lines

Browse source 
This patch add some helpers to control modem lines (CTS/RTS/DSR...) via
GPIO.
This will be useful for many boards which have a serial controller that
only handle CTS/RTS pins (or even just RX/TX).

Signed-off-by: Richard Genoud <[email protected]>
Acked-by: Greg Kroah-Hartman <[email protected]>
Tested-by: Yegor Yefremov <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Richard Genoud 2014-05-13 20:20:43 +02:00 • committed by Greg Kroah-Hartman
commit 84130aace8
5 changed files with 284 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

25
Documentation/serial/driver
View file

@ -429,3 +429,28 @@ thus:
struct uart_port port;
int my_stuff;
};
Modem control lines via GPIO
----------------------------
Some helpers are provided in order to set/get modem control lines via GPIO.
mctrl_gpio_init(dev, idx):
This will get the {cts,rts,...}-gpios from device tree if they are
present and request them, set direction etc, and return an
allocated structure. devm_* functions are used, so there's no need
to call mctrl_gpio_free().
mctrl_gpio_free(dev, gpios):
This will free the requested gpios in mctrl_gpio_init().
As devm_* function are used, there's generally no need to call
this function.
mctrl_gpio_to_gpiod(gpios, gidx)
This returns the gpio structure associated to the modem line index.
mctrl_gpio_set(gpios, mctrl):
This will sets the gpios according to the mctrl state.
mctrl_gpio_get(gpios, mctrl):
This will update mctrl with the gpios values.