148 lines
3.3 KiB
C
148 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Helpers for controlling modem lines via GPIO
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*
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* Copyright (C) 2014 Paratronic S.A.
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*/
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#ifndef __SERIAL_MCTRL_GPIO__
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#define __SERIAL_MCTRL_GPIO__
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#include <linux/err.h>
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#include <linux/device.h>
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#include <linux/gpio/consumer.h>
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struct uart_port;
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enum mctrl_gpio_idx {
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UART_GPIO_CTS,
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UART_GPIO_DSR,
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UART_GPIO_DCD,
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UART_GPIO_RNG,
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UART_GPIO_RI = UART_GPIO_RNG,
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UART_GPIO_RTS,
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UART_GPIO_DTR,
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UART_GPIO_MAX,
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};
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/*
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* Opaque descriptor for modem lines controlled by GPIOs
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*/
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struct mctrl_gpios;
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#ifdef CONFIG_GPIOLIB
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/*
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* Set state of the modem control output lines via GPIOs.
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*/
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void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl);
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/*
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* Get state of the modem control input lines from GPIOs.
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* The mctrl flags are updated and returned.
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*/
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unsigned int mctrl_gpio_get(struct mctrl_gpios *gpios, unsigned int *mctrl);
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/*
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* Get state of the modem control output lines from GPIOs.
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* The mctrl flags are updated and returned.
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*/
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unsigned int
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mctrl_gpio_get_outputs(struct mctrl_gpios *gpios, unsigned int *mctrl);
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/*
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* Returns the associated struct gpio_desc to the modem line gidx
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*/
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struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios,
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enum mctrl_gpio_idx gidx);
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/*
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* Request and set direction of modem control line GPIOs and set up irq
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* handling.
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* devm_* functions are used, so there's no need to call mctrl_gpio_free().
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* Returns a pointer to the allocated mctrl structure if ok, -ENOMEM on
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* allocation error.
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*/
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struct mctrl_gpios *mctrl_gpio_init(struct uart_port *port, unsigned int idx);
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/*
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* Request and set direction of modem control line GPIOs.
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* devm_* functions are used, so there's no need to call mctrl_gpio_free().
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* Returns a pointer to the allocated mctrl structure if ok, -ENOMEM on
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* allocation error.
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*/
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struct mctrl_gpios *mctrl_gpio_init_noauto(struct device *dev,
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unsigned int idx);
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/*
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* Free the mctrl_gpios structure.
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* Normally, this function will not be called, as the GPIOs will
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* be disposed of by the resource management code.
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*/
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void mctrl_gpio_free(struct device *dev, struct mctrl_gpios *gpios);
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/*
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* Enable gpio interrupts to report status line changes.
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*/
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void mctrl_gpio_enable_ms(struct mctrl_gpios *gpios);
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/*
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* Disable gpio interrupts to report status line changes.
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*/
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void mctrl_gpio_disable_ms(struct mctrl_gpios *gpios);
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#else /* GPIOLIB */
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static inline
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void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl)
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{
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}
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static inline
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unsigned int mctrl_gpio_get(struct mctrl_gpios *gpios, unsigned int *mctrl)
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{
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return *mctrl;
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}
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static inline unsigned int
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mctrl_gpio_get_outputs(struct mctrl_gpios *gpios, unsigned int *mctrl)
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{
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return *mctrl;
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}
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static inline
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struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios,
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enum mctrl_gpio_idx gidx)
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{
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return NULL;
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}
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static inline
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struct mctrl_gpios *mctrl_gpio_init(struct uart_port *port, unsigned int idx)
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{
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return NULL;
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}
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static inline
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struct mctrl_gpios *mctrl_gpio_init_noauto(struct device *dev, unsigned int idx)
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{
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return NULL;
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}
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static inline
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void mctrl_gpio_free(struct device *dev, struct mctrl_gpios *gpios)
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{
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}
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static inline void mctrl_gpio_enable_ms(struct mctrl_gpios *gpios)
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{
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}
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static inline void mctrl_gpio_disable_ms(struct mctrl_gpios *gpios)
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{
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}
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#endif /* GPIOLIB */
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#endif
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