forked from Minki/linux
bf5cee681e
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>
158 lines
3.8 KiB
C
158 lines
3.8 KiB
C
/*
|
|
* Helpers for controlling modem lines via GPIO
|
|
*
|
|
* Copyright (C) 2014 Paratronic S.A.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
*/
|
|
|
|
#ifndef __SERIAL_MCTRL_GPIO__
|
|
#define __SERIAL_MCTRL_GPIO__
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/device.h>
|
|
#include <linux/gpio/consumer.h>
|
|
|
|
struct uart_port;
|
|
|
|
enum mctrl_gpio_idx {
|
|
UART_GPIO_CTS,
|
|
UART_GPIO_DSR,
|
|
UART_GPIO_DCD,
|
|
UART_GPIO_RNG,
|
|
UART_GPIO_RI = UART_GPIO_RNG,
|
|
UART_GPIO_RTS,
|
|
UART_GPIO_DTR,
|
|
UART_GPIO_MAX,
|
|
};
|
|
|
|
/*
|
|
* Opaque descriptor for modem lines controlled by GPIOs
|
|
*/
|
|
struct mctrl_gpios;
|
|
|
|
#ifdef CONFIG_GPIOLIB
|
|
|
|
/*
|
|
* Set state of the modem control output lines via GPIOs.
|
|
*/
|
|
void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl);
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios,
|
|
enum mctrl_gpio_idx gidx);
|
|
|
|
/*
|
|
* Request and set direction of modem control line GPIOs and set 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 line GPIOs.
|
|
* 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_noauto(struct device *dev,
|
|
unsigned int idx);
|
|
|
|
/*
|
|
* Free the mctrl_gpios structure.
|
|
* Normally, this function will not be called, as the GPIOs will
|
|
* be disposed of by the resource management code.
|
|
*/
|
|
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
|
|
void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl)
|
|
{
|
|
}
|
|
|
|
static inline
|
|
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)
|
|
{
|
|
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)
|
|
{
|
|
return ERR_PTR(-ENOSYS);
|
|
}
|
|
|
|
static inline
|
|
void mctrl_gpio_free(struct device *dev, struct mctrl_gpios *gpios)
|
|
{
|
|
}
|
|
|
|
static inline void mctrl_gpio_enable_ms(struct mctrl_gpios *gpios)
|
|
{
|
|
}
|
|
|
|
static inline void mctrl_gpio_disable_ms(struct mctrl_gpios *gpios)
|
|
{
|
|
}
|
|
|
|
#endif /* GPIOLIB */
|
|
|
|
#endif
|