2 * Helpers for controlling modem lines via GPIO
4 * Copyright (C) 2014 Paratronic S.A.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
18 #ifndef __SERIAL_MCTRL_GPIO__
19 #define __SERIAL_MCTRL_GPIO__
21 #include <linux/err.h>
22 #include <linux/device.h>
23 #include <linux/gpio/consumer.h>
30 UART_GPIO_RI = UART_GPIO_RNG,
39 * Opaque descriptor for modem lines controlled by GPIOs
46 * Set state of the modem control output lines via GPIOs.
48 void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl);
51 * Get state of the modem control output lines from GPIOs.
52 * The mctrl flags are updated and returned.
54 unsigned int mctrl_gpio_get(struct mctrl_gpios *gpios, unsigned int *mctrl);
57 * Returns the associated struct gpio_desc to the modem line gidx
59 struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios,
60 enum mctrl_gpio_idx gidx);
63 * Request and set direction of modem control lines GPIOs.
64 * devm_* functions are used, so there's no need to call mctrl_gpio_free().
65 * Returns a pointer to the allocated mctrl structure if ok, -ENOMEM on
68 struct mctrl_gpios *mctrl_gpio_init(struct device *dev, unsigned int idx);
71 * Free the mctrl_gpios structure.
72 * Normally, this function will not be called, as the GPIOs will
73 * be disposed of by the resource management code.
75 void mctrl_gpio_free(struct device *dev, struct mctrl_gpios *gpios);
80 void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl)
85 unsigned int mctrl_gpio_get(struct mctrl_gpios *gpios, unsigned int *mctrl)
91 struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios,
92 enum mctrl_gpio_idx gidx)
94 return ERR_PTR(-ENOSYS);
98 struct mctrl_gpios *mctrl_gpio_init(struct device *dev, unsigned int idx)
100 return ERR_PTR(-ENOSYS);
104 void mctrl_gpio_free(struct device *dev, struct mctrl_gpios *gpios)