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 25ce59e48fSUwe Kleine-König struct uart_port; 26ce59e48fSUwe Kleine-König 2784130aacSRichard Genoud enum mctrl_gpio_idx { 2884130aacSRichard Genoud UART_GPIO_CTS, 2984130aacSRichard Genoud UART_GPIO_DSR, 3084130aacSRichard Genoud UART_GPIO_DCD, 3184130aacSRichard Genoud UART_GPIO_RNG, 3284130aacSRichard Genoud UART_GPIO_RI = UART_GPIO_RNG, 3384130aacSRichard Genoud UART_GPIO_RTS, 3484130aacSRichard Genoud UART_GPIO_DTR, 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 /* 51bf5cee68SYegor Yefremov * Get state of the modem control input 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 /* 57bf5cee68SYegor Yefremov * Get state of the modem control output lines from GPIOs. 58bf5cee68SYegor Yefremov * The mctrl flags are updated and returned. 59bf5cee68SYegor Yefremov */ 60bf5cee68SYegor Yefremov unsigned int 61bf5cee68SYegor Yefremov mctrl_gpio_get_outputs(struct mctrl_gpios *gpios, unsigned int *mctrl); 62bf5cee68SYegor Yefremov 63bf5cee68SYegor Yefremov /* 6484130aacSRichard Genoud * Returns the associated struct gpio_desc to the modem line gidx 6584130aacSRichard Genoud */ 6684130aacSRichard Genoud struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios, 6784130aacSRichard Genoud enum mctrl_gpio_idx gidx); 6884130aacSRichard Genoud 6984130aacSRichard Genoud /* 7003e970bbSGeert Uytterhoeven * Request and set direction of modem control line GPIOs and set up irq 71ce59e48fSUwe Kleine-König * handling. 72ce59e48fSUwe Kleine-König * devm_* functions are used, so there's no need to call mctrl_gpio_free(). 73ce59e48fSUwe Kleine-König * Returns a pointer to the allocated mctrl structure if ok, -ENOMEM on 74ce59e48fSUwe Kleine-König * allocation error. 75ce59e48fSUwe Kleine-König */ 76ce59e48fSUwe Kleine-König struct mctrl_gpios *mctrl_gpio_init(struct uart_port *port, unsigned int idx); 77ce59e48fSUwe Kleine-König 78ce59e48fSUwe Kleine-König /* 7903e970bbSGeert Uytterhoeven * Request and set direction of modem control line GPIOs. 8084130aacSRichard Genoud * devm_* functions are used, so there's no need to call mctrl_gpio_free(). 8184130aacSRichard Genoud * Returns a pointer to the allocated mctrl structure if ok, -ENOMEM on 8284130aacSRichard Genoud * allocation error. 8384130aacSRichard Genoud */ 847d8c70d8SUwe Kleine-König struct mctrl_gpios *mctrl_gpio_init_noauto(struct device *dev, 857d8c70d8SUwe Kleine-König unsigned int idx); 8684130aacSRichard Genoud 8784130aacSRichard Genoud /* 8884130aacSRichard Genoud * Free the mctrl_gpios structure. 8984130aacSRichard Genoud * Normally, this function will not be called, as the GPIOs will 9084130aacSRichard Genoud * be disposed of by the resource management code. 9184130aacSRichard Genoud */ 9284130aacSRichard Genoud void mctrl_gpio_free(struct device *dev, struct mctrl_gpios *gpios); 9384130aacSRichard Genoud 94ce59e48fSUwe Kleine-König /* 95ce59e48fSUwe Kleine-König * Enable gpio interrupts to report status line changes. 96ce59e48fSUwe Kleine-König */ 97ce59e48fSUwe Kleine-König void mctrl_gpio_enable_ms(struct mctrl_gpios *gpios); 98ce59e48fSUwe Kleine-König 99ce59e48fSUwe Kleine-König /* 100ce59e48fSUwe Kleine-König * Disable gpio interrupts to report status line changes. 101ce59e48fSUwe Kleine-König */ 102ce59e48fSUwe Kleine-König void mctrl_gpio_disable_ms(struct mctrl_gpios *gpios); 103ce59e48fSUwe Kleine-König 10484130aacSRichard Genoud #else /* GPIOLIB */ 10584130aacSRichard Genoud 10684130aacSRichard Genoud static inline 10784130aacSRichard Genoud void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl) 10884130aacSRichard Genoud { 10984130aacSRichard Genoud } 11084130aacSRichard Genoud 11184130aacSRichard Genoud static inline 11284130aacSRichard Genoud unsigned int mctrl_gpio_get(struct mctrl_gpios *gpios, unsigned int *mctrl) 11384130aacSRichard Genoud { 11484130aacSRichard Genoud return *mctrl; 11584130aacSRichard Genoud } 11684130aacSRichard Genoud 117bf5cee68SYegor Yefremov static inline unsigned int 118bf5cee68SYegor Yefremov mctrl_gpio_get_outputs(struct mctrl_gpios *gpios, unsigned int *mctrl) 119bf5cee68SYegor Yefremov { 120bf5cee68SYegor Yefremov return *mctrl; 121bf5cee68SYegor Yefremov } 122bf5cee68SYegor Yefremov 12384130aacSRichard Genoud static inline 12484130aacSRichard Genoud struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios, 12584130aacSRichard Genoud enum mctrl_gpio_idx gidx) 12684130aacSRichard Genoud { 12784130aacSRichard Genoud return ERR_PTR(-ENOSYS); 12884130aacSRichard Genoud } 12984130aacSRichard Genoud 13084130aacSRichard Genoud static inline 131ce59e48fSUwe Kleine-König struct mctrl_gpios *mctrl_gpio_init(struct uart_port *port, unsigned int idx) 132ce59e48fSUwe Kleine-König { 133ce59e48fSUwe Kleine-König return ERR_PTR(-ENOSYS); 134ce59e48fSUwe Kleine-König } 135ce59e48fSUwe Kleine-König 136ce59e48fSUwe Kleine-König static inline 1377d8c70d8SUwe Kleine-König struct mctrl_gpios *mctrl_gpio_init_noauto(struct device *dev, unsigned int idx) 13884130aacSRichard Genoud { 13984130aacSRichard Genoud return ERR_PTR(-ENOSYS); 14084130aacSRichard Genoud } 14184130aacSRichard Genoud 14284130aacSRichard Genoud static inline 14384130aacSRichard Genoud void mctrl_gpio_free(struct device *dev, struct mctrl_gpios *gpios) 14484130aacSRichard Genoud { 14584130aacSRichard Genoud } 14684130aacSRichard Genoud 1471b306f99SArnd Bergmann static inline void mctrl_gpio_enable_ms(struct mctrl_gpios *gpios) 148ce59e48fSUwe Kleine-König { 149ce59e48fSUwe Kleine-König } 150ce59e48fSUwe Kleine-König 1511b306f99SArnd Bergmann static inline void mctrl_gpio_disable_ms(struct mctrl_gpios *gpios) 152ce59e48fSUwe Kleine-König { 153ce59e48fSUwe Kleine-König } 154ce59e48fSUwe Kleine-König 15584130aacSRichard Genoud #endif /* GPIOLIB */ 15684130aacSRichard Genoud 15784130aacSRichard Genoud #endif 158