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b67fcbdc56
The OUT1 and OUT2 pins present on some legacy UARTs are basically GPIOs. It doesn't make much sense to emulate GPIOs using other GPIOs, hence drop support for that. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Peter Hurley <peter@hurleysoftware.com> Reviewed-by: Richard Genoud <richard.genoud@gmail.com> Reviewed-by: Yegor Yefremov <yegorslists@googlemail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
145 lines
3.5 KiB
C
145 lines
3.5 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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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 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 mctrl_gpio_get(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
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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 ERR_PTR(-ENOSYS);
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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 ERR_PTR(-ENOSYS);
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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 ERR_PTR(-ENOSYS);
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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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