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serial: mctrl_gpio: add modem control read routine

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mctrl_gpio_get_outputs() returns the state of following signals:

RTS, DTR

While defining the routine for reading outputs, fix the comment for
mctrl_gpio_get() routine as it returns only the state of the input
signals.

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yegor Yefremov 2016-05-31 10:59:16 +02:00 committed by Greg Kroah-Hartman
parent 36fd95b17e
commit bf5cee681e
2 changed files with 32 additions and 1 deletions
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18
drivers/tty/serial/serial_mctrl_gpio.c
View file

@ -86,6 +86,24 @@ unsigned int mctrl_gpio_get(struct mctrl_gpios *gpios, unsigned int *mctrl)
}
EXPORT_SYMBOL_GPL(mctrl_gpio_get);
unsigned int
mctrl_gpio_get_outputs(struct mctrl_gpios *gpios, unsigned int *mctrl)
{
enum mctrl_gpio_idx i;
for (i = 0; i < UART_GPIO_MAX; i++) {
if (gpios->gpio[i] && mctrl_gpios_desc[i].dir_out) {
if (gpiod_get_value(gpios->gpio[i]))
*mctrl |= mctrl_gpios_desc[i].mctrl;
else
*mctrl &= ~mctrl_gpios_desc[i].mctrl;
}
}
return *mctrl;
}
EXPORT_SYMBOL_GPL(mctrl_gpio_get_outputs);
struct mctrl_gpios *mctrl_gpio_init_noauto(struct device *dev, unsigned int idx)
{
struct mctrl_gpios *gpios;

15
drivers/tty/serial/serial_mctrl_gpio.h
View file

@ -48,11 +48,18 @@ struct mctrl_gpios;
void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl);
/*
* Get state of the modem control output lines from GPIOs.
* Get state of the modem control input lines from GPIOs.
* The mctrl flags are updated and returned.
*/
unsigned int mctrl_gpio_get(struct mctrl_gpios *gpios, unsigned int *mctrl);
/*
* Get state of the modem control output lines from GPIOs.
* The mctrl flags are updated and returned.
*/
unsigned int
mctrl_gpio_get_outputs(struct mctrl_gpios *gpios, unsigned int *mctrl);
/*
* Returns the associated struct gpio_desc to the modem line gidx
*/
@ -107,6 +114,12 @@ unsigned int mctrl_gpio_get(struct mctrl_gpios *gpios, unsigned int *mctrl)
return *mctrl;
}
static inline unsigned int
mctrl_gpio_get_outputs(struct mctrl_gpios *gpios, unsigned int *mctrl)
{
return *mctrl;
}
static inline
struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios,
enum mctrl_gpio_idx gidx)