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_OUT1, 3684130aacSRichard Genoud UART_GPIO_OUT2, 3784130aacSRichard Genoud UART_GPIO_MAX, 3884130aacSRichard Genoud }; 3984130aacSRichard Genoud 4084130aacSRichard Genoud /* 4184130aacSRichard Genoud * Opaque descriptor for modem lines controlled by GPIOs 4284130aacSRichard Genoud */ 4384130aacSRichard Genoud struct mctrl_gpios; 4484130aacSRichard Genoud 4584130aacSRichard Genoud #ifdef CONFIG_GPIOLIB 4684130aacSRichard Genoud 4784130aacSRichard Genoud /* 4884130aacSRichard Genoud * Set state of the modem control output lines via GPIOs. 4984130aacSRichard Genoud */ 5084130aacSRichard Genoud void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl); 5184130aacSRichard Genoud 5284130aacSRichard Genoud /* 5384130aacSRichard Genoud * Get state of the modem control output lines from GPIOs. 5484130aacSRichard Genoud * The mctrl flags are updated and returned. 5584130aacSRichard Genoud */ 5684130aacSRichard Genoud unsigned int mctrl_gpio_get(struct mctrl_gpios *gpios, unsigned int *mctrl); 5784130aacSRichard Genoud 5884130aacSRichard Genoud /* 5984130aacSRichard Genoud * Returns the associated struct gpio_desc to the modem line gidx 6084130aacSRichard Genoud */ 6184130aacSRichard Genoud struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios, 6284130aacSRichard Genoud enum mctrl_gpio_idx gidx); 6384130aacSRichard Genoud 6484130aacSRichard Genoud /* 65ce59e48fSUwe Kleine-König * Request and set direction of modem control lines GPIOs and sets up irq 66ce59e48fSUwe Kleine-König * handling. 67ce59e48fSUwe Kleine-König * devm_* functions are used, so there's no need to call mctrl_gpio_free(). 68ce59e48fSUwe Kleine-König * Returns a pointer to the allocated mctrl structure if ok, -ENOMEM on 69ce59e48fSUwe Kleine-König * allocation error. 70ce59e48fSUwe Kleine-König */ 71ce59e48fSUwe Kleine-König struct mctrl_gpios *mctrl_gpio_init(struct uart_port *port, unsigned int idx); 72ce59e48fSUwe Kleine-König 73ce59e48fSUwe Kleine-König /* 7484130aacSRichard Genoud * Request and set direction of modem control lines GPIOs. 7584130aacSRichard Genoud * devm_* functions are used, so there's no need to call mctrl_gpio_free(). 7684130aacSRichard Genoud * Returns a pointer to the allocated mctrl structure if ok, -ENOMEM on 7784130aacSRichard Genoud * allocation error. 7884130aacSRichard Genoud */ 797d8c70d8SUwe Kleine-König struct mctrl_gpios *mctrl_gpio_init_noauto(struct device *dev, 807d8c70d8SUwe Kleine-König unsigned int idx); 8184130aacSRichard Genoud 8284130aacSRichard Genoud /* 8384130aacSRichard Genoud * Free the mctrl_gpios structure. 8484130aacSRichard Genoud * Normally, this function will not be called, as the GPIOs will 8584130aacSRichard Genoud * be disposed of by the resource management code. 8684130aacSRichard Genoud */ 8784130aacSRichard Genoud void mctrl_gpio_free(struct device *dev, struct mctrl_gpios *gpios); 8884130aacSRichard Genoud 89ce59e48fSUwe Kleine-König /* 90ce59e48fSUwe Kleine-König * Enable gpio interrupts to report status line changes. 91ce59e48fSUwe Kleine-König */ 92ce59e48fSUwe Kleine-König void mctrl_gpio_enable_ms(struct mctrl_gpios *gpios); 93ce59e48fSUwe Kleine-König 94ce59e48fSUwe Kleine-König /* 95ce59e48fSUwe Kleine-König * Disable gpio interrupts to report status line changes. 96ce59e48fSUwe Kleine-König */ 97ce59e48fSUwe Kleine-König void mctrl_gpio_disable_ms(struct mctrl_gpios *gpios); 98ce59e48fSUwe Kleine-König 9984130aacSRichard Genoud #else /* GPIOLIB */ 10084130aacSRichard Genoud 10184130aacSRichard Genoud static inline 10284130aacSRichard Genoud void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl) 10384130aacSRichard Genoud { 10484130aacSRichard Genoud } 10584130aacSRichard Genoud 10684130aacSRichard Genoud static inline 10784130aacSRichard Genoud unsigned int mctrl_gpio_get(struct mctrl_gpios *gpios, unsigned int *mctrl) 10884130aacSRichard Genoud { 10984130aacSRichard Genoud return *mctrl; 11084130aacSRichard Genoud } 11184130aacSRichard Genoud 11284130aacSRichard Genoud static inline 11384130aacSRichard Genoud struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios, 11484130aacSRichard Genoud enum mctrl_gpio_idx gidx) 11584130aacSRichard Genoud { 11684130aacSRichard Genoud return ERR_PTR(-ENOSYS); 11784130aacSRichard Genoud } 11884130aacSRichard Genoud 11984130aacSRichard Genoud static inline 120ce59e48fSUwe Kleine-König struct mctrl_gpios *mctrl_gpio_init(struct uart_port *port, unsigned int idx) 121ce59e48fSUwe Kleine-König { 122ce59e48fSUwe Kleine-König return ERR_PTR(-ENOSYS); 123ce59e48fSUwe Kleine-König } 124ce59e48fSUwe Kleine-König 125ce59e48fSUwe Kleine-König static inline 1267d8c70d8SUwe Kleine-König struct mctrl_gpios *mctrl_gpio_init_noauto(struct device *dev, unsigned int idx) 12784130aacSRichard Genoud { 12884130aacSRichard Genoud return ERR_PTR(-ENOSYS); 12984130aacSRichard Genoud } 13084130aacSRichard Genoud 13184130aacSRichard Genoud static inline 13284130aacSRichard Genoud void mctrl_gpio_free(struct device *dev, struct mctrl_gpios *gpios) 13384130aacSRichard Genoud { 13484130aacSRichard Genoud } 13584130aacSRichard Genoud 136ce59e48fSUwe Kleine-König void mctrl_gpio_enable_ms(struct mctrl_gpios *gpios) 137ce59e48fSUwe Kleine-König { 138ce59e48fSUwe Kleine-König } 139ce59e48fSUwe Kleine-König 140ce59e48fSUwe Kleine-König void mctrl_gpio_disable_ms(struct mctrl_gpios *gpios) 141ce59e48fSUwe Kleine-König { 142ce59e48fSUwe Kleine-König } 143ce59e48fSUwe Kleine-König 14484130aacSRichard Genoud #endif /* GPIOLIB */ 14584130aacSRichard Genoud 14684130aacSRichard Genoud #endif 147