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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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35
drivers/tty/serial/serial_mctrl_gpio.h
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@@ -22,6 +22,8 @@
#include <linux/device.h>
#include <linux/gpio/consumer.h>
struct uart_port;
enum mctrl_gpio_idx {
UART_GPIO_CTS,
UART_GPIO_DSR,
@@ -59,6 +61,15 @@ unsigned int mctrl_gpio_get(struct mctrl_gpios *gpios, unsigned int *mctrl);
struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios,
enum mctrl_gpio_idx gidx);
/*
* Request and set direction of modem control lines GPIOs and sets up irq
* handling.
* devm_* functions are used, so there's no need to call mctrl_gpio_free().
* Returns a pointer to the allocated mctrl structure if ok, -ENOMEM on
* allocation error.
*/
struct mctrl_gpios *mctrl_gpio_init(struct uart_port *port, unsigned int idx);
/*
* Request and set direction of modem control lines GPIOs.
* devm_* functions are used, so there's no need to call mctrl_gpio_free().
@@ -75,6 +86,16 @@ struct mctrl_gpios *mctrl_gpio_init_noauto(struct device *dev,
*/
void mctrl_gpio_free(struct device *dev, struct mctrl_gpios *gpios);
/*
* Enable gpio interrupts to report status line changes.
*/
void mctrl_gpio_enable_ms(struct mctrl_gpios *gpios);
/*
* Disable gpio interrupts to report status line changes.
*/
void mctrl_gpio_disable_ms(struct mctrl_gpios *gpios);
#else /* GPIOLIB */
static inline
@@ -95,6 +116,12 @@ struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios,
return ERR_PTR(-ENOSYS);
}
static inline
struct mctrl_gpios *mctrl_gpio_init(struct uart_port *port, unsigned int idx)
{
return ERR_PTR(-ENOSYS);
}
static inline
struct mctrl_gpios *mctrl_gpio_init_noauto(struct device *dev, unsigned int idx)
{
@@ -106,6 +133,14 @@ void mctrl_gpio_free(struct device *dev, struct mctrl_gpios *gpios)
{
}
void mctrl_gpio_enable_ms(struct mctrl_gpios *gpios)
{
}
void mctrl_gpio_disable_ms(struct mctrl_gpios *gpios)
{
}
#endif /* GPIOLIB */
#endif