1e3b3d0f5SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0+ 284130aacSRichard Genoud /* 384130aacSRichard Genoud * Helpers for controlling modem lines via GPIO 484130aacSRichard Genoud * 584130aacSRichard Genoud * Copyright (C) 2014 Paratronic S.A. 684130aacSRichard Genoud */ 784130aacSRichard Genoud 884130aacSRichard Genoud #ifndef __SERIAL_MCTRL_GPIO__ 984130aacSRichard Genoud #define __SERIAL_MCTRL_GPIO__ 1084130aacSRichard Genoud 1184130aacSRichard Genoud #include <linux/err.h> 1284130aacSRichard Genoud #include <linux/device.h> 1384130aacSRichard Genoud #include <linux/gpio/consumer.h> 1484130aacSRichard Genoud 15ce59e48fSUwe Kleine-König struct uart_port; 16ce59e48fSUwe Kleine-König 1784130aacSRichard Genoud enum mctrl_gpio_idx { 1884130aacSRichard Genoud UART_GPIO_CTS, 1984130aacSRichard Genoud UART_GPIO_DSR, 2084130aacSRichard Genoud UART_GPIO_DCD, 2184130aacSRichard Genoud UART_GPIO_RNG, 2284130aacSRichard Genoud UART_GPIO_RI = UART_GPIO_RNG, 2384130aacSRichard Genoud UART_GPIO_RTS, 2484130aacSRichard Genoud UART_GPIO_DTR, 2584130aacSRichard Genoud UART_GPIO_MAX, 2684130aacSRichard Genoud }; 2784130aacSRichard Genoud 2884130aacSRichard Genoud /* 2984130aacSRichard Genoud * Opaque descriptor for modem lines controlled by GPIOs 3084130aacSRichard Genoud */ 3184130aacSRichard Genoud struct mctrl_gpios; 3284130aacSRichard Genoud 3384130aacSRichard Genoud #ifdef CONFIG_GPIOLIB 3484130aacSRichard Genoud 3584130aacSRichard Genoud /* 3684130aacSRichard Genoud * Set state of the modem control output lines via GPIOs. 3784130aacSRichard Genoud */ 3884130aacSRichard Genoud void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl); 3984130aacSRichard Genoud 4084130aacSRichard Genoud /* 41bf5cee68SYegor Yefremov * Get state of the modem control input lines from GPIOs. 4284130aacSRichard Genoud * The mctrl flags are updated and returned. 4384130aacSRichard Genoud */ 4484130aacSRichard Genoud unsigned int mctrl_gpio_get(struct mctrl_gpios *gpios, unsigned int *mctrl); 4584130aacSRichard Genoud 4684130aacSRichard Genoud /* 47bf5cee68SYegor Yefremov * Get state of the modem control output lines from GPIOs. 48bf5cee68SYegor Yefremov * The mctrl flags are updated and returned. 49bf5cee68SYegor Yefremov */ 50bf5cee68SYegor Yefremov unsigned int 51bf5cee68SYegor Yefremov mctrl_gpio_get_outputs(struct mctrl_gpios *gpios, unsigned int *mctrl); 52bf5cee68SYegor Yefremov 53bf5cee68SYegor Yefremov /* 5484130aacSRichard Genoud * Returns the associated struct gpio_desc to the modem line gidx 5584130aacSRichard Genoud */ 5684130aacSRichard Genoud struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios, 5784130aacSRichard Genoud enum mctrl_gpio_idx gidx); 5884130aacSRichard Genoud 5984130aacSRichard Genoud /* 6003e970bbSGeert Uytterhoeven * Request and set direction of modem control line GPIOs and set up irq 61ce59e48fSUwe Kleine-König * handling. 62ce59e48fSUwe Kleine-König * devm_* functions are used, so there's no need to call mctrl_gpio_free(). 63ce59e48fSUwe Kleine-König * Returns a pointer to the allocated mctrl structure if ok, -ENOMEM on 64ce59e48fSUwe Kleine-König * allocation error. 65ce59e48fSUwe Kleine-König */ 66ce59e48fSUwe Kleine-König struct mctrl_gpios *mctrl_gpio_init(struct uart_port *port, unsigned int idx); 67ce59e48fSUwe Kleine-König 68ce59e48fSUwe Kleine-König /* 6903e970bbSGeert Uytterhoeven * Request and set direction of modem control line GPIOs. 7084130aacSRichard Genoud * devm_* functions are used, so there's no need to call mctrl_gpio_free(). 7184130aacSRichard Genoud * Returns a pointer to the allocated mctrl structure if ok, -ENOMEM on 7284130aacSRichard Genoud * allocation error. 7384130aacSRichard Genoud */ 747d8c70d8SUwe Kleine-König struct mctrl_gpios *mctrl_gpio_init_noauto(struct device *dev, 757d8c70d8SUwe Kleine-König unsigned int idx); 7684130aacSRichard Genoud 7784130aacSRichard Genoud /* 7884130aacSRichard Genoud * Free the mctrl_gpios structure. 7984130aacSRichard Genoud * Normally, this function will not be called, as the GPIOs will 8084130aacSRichard Genoud * be disposed of by the resource management code. 8184130aacSRichard Genoud */ 8284130aacSRichard Genoud void mctrl_gpio_free(struct device *dev, struct mctrl_gpios *gpios); 8384130aacSRichard Genoud 84ce59e48fSUwe Kleine-König /* 85ce59e48fSUwe Kleine-König * Enable gpio interrupts to report status line changes. 86ce59e48fSUwe Kleine-König */ 87ce59e48fSUwe Kleine-König void mctrl_gpio_enable_ms(struct mctrl_gpios *gpios); 88ce59e48fSUwe Kleine-König 89ce59e48fSUwe Kleine-König /* 90ce59e48fSUwe Kleine-König * Disable gpio interrupts to report status line changes. 91ce59e48fSUwe Kleine-König */ 92ce59e48fSUwe Kleine-König void mctrl_gpio_disable_ms(struct mctrl_gpios *gpios); 93ce59e48fSUwe Kleine-König 9484130aacSRichard Genoud #else /* GPIOLIB */ 9584130aacSRichard Genoud 9684130aacSRichard Genoud static inline 9784130aacSRichard Genoud void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl) 9884130aacSRichard Genoud { 9984130aacSRichard Genoud } 10084130aacSRichard Genoud 10184130aacSRichard Genoud static inline 10284130aacSRichard Genoud unsigned int mctrl_gpio_get(struct mctrl_gpios *gpios, unsigned int *mctrl) 10384130aacSRichard Genoud { 10484130aacSRichard Genoud return *mctrl; 10584130aacSRichard Genoud } 10684130aacSRichard Genoud 107bf5cee68SYegor Yefremov static inline unsigned int 108bf5cee68SYegor Yefremov mctrl_gpio_get_outputs(struct mctrl_gpios *gpios, unsigned int *mctrl) 109bf5cee68SYegor Yefremov { 110bf5cee68SYegor Yefremov return *mctrl; 111bf5cee68SYegor Yefremov } 112bf5cee68SYegor Yefremov 11384130aacSRichard Genoud static inline 11484130aacSRichard Genoud struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios, 11584130aacSRichard Genoud enum mctrl_gpio_idx gidx) 11684130aacSRichard Genoud { 117e8b2a618SFrieder Schrempf return NULL; 11884130aacSRichard Genoud } 11984130aacSRichard Genoud 12084130aacSRichard Genoud static inline 121ce59e48fSUwe Kleine-König struct mctrl_gpios *mctrl_gpio_init(struct uart_port *port, unsigned int idx) 122ce59e48fSUwe Kleine-König { 123e8b2a618SFrieder Schrempf return NULL; 124ce59e48fSUwe Kleine-König } 125ce59e48fSUwe Kleine-König 126ce59e48fSUwe Kleine-König static inline 1277d8c70d8SUwe Kleine-König struct mctrl_gpios *mctrl_gpio_init_noauto(struct device *dev, unsigned int idx) 12884130aacSRichard Genoud { 129e8b2a618SFrieder Schrempf return NULL; 13084130aacSRichard Genoud } 13184130aacSRichard Genoud 13284130aacSRichard Genoud static inline 13384130aacSRichard Genoud void mctrl_gpio_free(struct device *dev, struct mctrl_gpios *gpios) 13484130aacSRichard Genoud { 13584130aacSRichard Genoud } 13684130aacSRichard Genoud 1371b306f99SArnd Bergmann static inline void mctrl_gpio_enable_ms(struct mctrl_gpios *gpios) 138ce59e48fSUwe Kleine-König { 139ce59e48fSUwe Kleine-König } 140ce59e48fSUwe Kleine-König 1411b306f99SArnd Bergmann static inline void mctrl_gpio_disable_ms(struct mctrl_gpios *gpios) 142ce59e48fSUwe Kleine-König { 143ce59e48fSUwe Kleine-König } 144ce59e48fSUwe Kleine-König 14584130aacSRichard Genoud #endif /* GPIOLIB */ 14684130aacSRichard Genoud 14784130aacSRichard Genoud #endif 148