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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/tty/serial/serial_mctrl_gpio.h | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/tty/serial/serial_mctrl_gpio.h')
-rw-r--r-- | drivers/tty/serial/serial_mctrl_gpio.h | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/drivers/tty/serial/serial_mctrl_gpio.h b/drivers/tty/serial/serial_mctrl_gpio.h new file mode 100644 index 000000000..fc76910fb --- /dev/null +++ b/drivers/tty/serial/serial_mctrl_gpio.h @@ -0,0 +1,165 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Helpers for controlling modem lines via GPIO + * + * Copyright (C) 2014 Paratronic S.A. + */ + +#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); + +/* + * Enable gpio wakeup interrupts to enable wake up source. + */ +void mctrl_gpio_enable_irq_wake(struct mctrl_gpios *gpios); + +/* + * Disable gpio wakeup interrupts to enable wake up source. + */ +void mctrl_gpio_disable_irq_wake(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 NULL; +} + +static inline +struct mctrl_gpios *mctrl_gpio_init(struct uart_port *port, unsigned int idx) +{ + return NULL; +} + +static inline +struct mctrl_gpios *mctrl_gpio_init_noauto(struct device *dev, unsigned int idx) +{ + return NULL; +} + +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) +{ +} + +static inline void mctrl_gpio_enable_irq_wake(struct mctrl_gpios *gpios) +{ +} + +static inline void mctrl_gpio_disable_irq_wake(struct mctrl_gpios *gpios) +{ +} + +#endif /* GPIOLIB */ + +#endif |