184130aacSRichard Genoud /* 284130aacSRichard Genoud * Helpers for controlling modem lines via GPIO 384130aacSRichard Genoud * 484130aacSRichard Genoud * Copyright (C) 2014 Paratronic S.A. 584130aacSRichard Genoud * 684130aacSRichard Genoud * This program is free software; you can redistribute it and/or modify 784130aacSRichard Genoud * it under the terms of the GNU General Public License as published by 884130aacSRichard Genoud * the Free Software Foundation; either version 2 of the License, or 984130aacSRichard Genoud * (at your option) any later version. 1084130aacSRichard Genoud * 1184130aacSRichard Genoud * This program is distributed in the hope that it will be useful, 1284130aacSRichard Genoud * but WITHOUT ANY WARRANTY; without even the implied warranty of 1384130aacSRichard Genoud * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 1484130aacSRichard Genoud * GNU General Public License for more details. 1584130aacSRichard Genoud * 1684130aacSRichard Genoud */ 1784130aacSRichard Genoud 1884130aacSRichard Genoud #ifndef __SERIAL_MCTRL_GPIO__ 1984130aacSRichard Genoud #define __SERIAL_MCTRL_GPIO__ 2084130aacSRichard Genoud 2184130aacSRichard Genoud #include <linux/err.h> 2284130aacSRichard Genoud #include <linux/device.h> 2384130aacSRichard Genoud #include <linux/gpio/consumer.h> 2484130aacSRichard Genoud 2584130aacSRichard Genoud enum mctrl_gpio_idx { 2684130aacSRichard Genoud UART_GPIO_CTS, 2784130aacSRichard Genoud UART_GPIO_DSR, 2884130aacSRichard Genoud UART_GPIO_DCD, 2984130aacSRichard Genoud UART_GPIO_RNG, 3084130aacSRichard Genoud UART_GPIO_RI = UART_GPIO_RNG, 3184130aacSRichard Genoud UART_GPIO_RTS, 3284130aacSRichard Genoud UART_GPIO_DTR, 3384130aacSRichard Genoud UART_GPIO_OUT1, 3484130aacSRichard Genoud UART_GPIO_OUT2, 3584130aacSRichard Genoud UART_GPIO_MAX, 3684130aacSRichard Genoud }; 3784130aacSRichard Genoud 3884130aacSRichard Genoud /* 3984130aacSRichard Genoud * Opaque descriptor for modem lines controlled by GPIOs 4084130aacSRichard Genoud */ 4184130aacSRichard Genoud struct mctrl_gpios; 4284130aacSRichard Genoud 4384130aacSRichard Genoud #ifdef CONFIG_GPIOLIB 4484130aacSRichard Genoud 4584130aacSRichard Genoud /* 4684130aacSRichard Genoud * Set state of the modem control output lines via GPIOs. 4784130aacSRichard Genoud */ 4884130aacSRichard Genoud void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl); 4984130aacSRichard Genoud 5084130aacSRichard Genoud /* 5184130aacSRichard Genoud * Get state of the modem control output lines from GPIOs. 5284130aacSRichard Genoud * The mctrl flags are updated and returned. 5384130aacSRichard Genoud */ 5484130aacSRichard Genoud unsigned int mctrl_gpio_get(struct mctrl_gpios *gpios, unsigned int *mctrl); 5584130aacSRichard Genoud 5684130aacSRichard Genoud /* 5784130aacSRichard Genoud * Returns the associated struct gpio_desc to the modem line gidx 5884130aacSRichard Genoud */ 5984130aacSRichard Genoud struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios, 6084130aacSRichard Genoud enum mctrl_gpio_idx gidx); 6184130aacSRichard Genoud 6284130aacSRichard Genoud /* 6384130aacSRichard Genoud * Request and set direction of modem control lines GPIOs. 6484130aacSRichard Genoud * devm_* functions are used, so there's no need to call mctrl_gpio_free(). 6584130aacSRichard Genoud * Returns a pointer to the allocated mctrl structure if ok, -ENOMEM on 6684130aacSRichard Genoud * allocation error. 6784130aacSRichard Genoud */ 6884130aacSRichard Genoud struct mctrl_gpios *mctrl_gpio_init(struct device *dev, unsigned int idx); 6984130aacSRichard Genoud 7084130aacSRichard Genoud /* 7184130aacSRichard Genoud * Free the mctrl_gpios structure. 7284130aacSRichard Genoud * Normally, this function will not be called, as the GPIOs will 7384130aacSRichard Genoud * be disposed of by the resource management code. 7484130aacSRichard Genoud */ 7584130aacSRichard Genoud void mctrl_gpio_free(struct device *dev, struct mctrl_gpios *gpios); 7684130aacSRichard Genoud 7784130aacSRichard Genoud #else /* GPIOLIB */ 7884130aacSRichard Genoud 7984130aacSRichard Genoud static inline 8084130aacSRichard Genoud void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl) 8184130aacSRichard Genoud { 8284130aacSRichard Genoud } 8384130aacSRichard Genoud 8484130aacSRichard Genoud static inline 8584130aacSRichard Genoud unsigned int mctrl_gpio_get(struct mctrl_gpios *gpios, unsigned int *mctrl) 8684130aacSRichard Genoud { 8784130aacSRichard Genoud return *mctrl; 8884130aacSRichard Genoud } 8984130aacSRichard Genoud 9084130aacSRichard Genoud static inline 9184130aacSRichard Genoud struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios, 9284130aacSRichard Genoud enum mctrl_gpio_idx gidx) 9384130aacSRichard Genoud { 9484130aacSRichard Genoud return ERR_PTR(-ENOSYS); 9584130aacSRichard Genoud } 9684130aacSRichard Genoud 9784130aacSRichard Genoud static inline 9884130aacSRichard Genoud struct mctrl_gpios *mctrl_gpio_init(struct device *dev, unsigned int idx) 9984130aacSRichard Genoud { 10084130aacSRichard Genoud return ERR_PTR(-ENOSYS); 10184130aacSRichard Genoud } 10284130aacSRichard Genoud 10384130aacSRichard Genoud static inline 10484130aacSRichard Genoud void mctrl_gpio_free(struct device *dev, struct mctrl_gpios *gpios) 10584130aacSRichard Genoud { 10684130aacSRichard Genoud } 10784130aacSRichard Genoud 10884130aacSRichard Genoud #endif /* GPIOLIB */ 10984130aacSRichard Genoud 11084130aacSRichard Genoud #endif 111