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serial: mctrl_gpio: implement interrupt handling

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This allows to reduce the per-driver boiler plate considerably.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Uwe Kleine-König
2015-09-30 10:19:41 +02:00
committed by Greg Kroah-Hartman
parent 7d8c70d804
commit ce59e48fdb
3 changed files with 171 additions and 3 deletions
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Documentation/serial/driver
+9 -1
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@@ -439,11 +439,13 @@ Modem control lines via GPIO
Some helpers are provided in order to set/get modem control lines via GPIO.
mctrl_gpio_init(dev, idx):
mctrl_gpio_init(port, 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().
As this sets up the irq handling make sure to not handle changes to the
gpio input lines in your driver, too.
mctrl_gpio_free(dev, gpios):
This will free the requested gpios in mctrl_gpio_init().
@@ -458,3 +460,9 @@ mctrl_gpio_set(gpios, mctrl):
mctrl_gpio_get(gpios, mctrl):
This will update mctrl with the gpios values.
mctrl_gpio_enable_ms(gpios):
Enables irqs and handling of changes to the ms lines.
mctrl_gpio_disable_ms(gpios):
Disables irqs and handling of changes to the ms lines.