1 /* SPDX-License-Identifier: GPL-2.0 */ 2 3 #ifndef __LINUX_GPIO_SHARED_H 4 #define __LINUX_GPIO_SHARED_H 5 6 #include <linux/mutex.h> 7 8 struct gpio_device; 9 struct gpio_desc; 10 struct device; 11 struct fwnode_handle; 12 13 #if IS_ENABLED(CONFIG_GPIO_SHARED) 14 15 int gpiochip_setup_shared(struct gpio_chip *gc); 16 void gpio_device_teardown_shared(struct gpio_device *gdev); 17 int gpio_shared_add_proxy_lookup(struct device *consumer, 18 struct fwnode_handle *fwnode, 19 const char *con_id, unsigned long lflags); 20 21 #else 22 23 static inline int gpiochip_setup_shared(struct gpio_chip *gc) 24 { 25 return 0; 26 } 27 28 static inline void gpio_device_teardown_shared(struct gpio_device *gdev) { } 29 30 static inline int gpio_shared_add_proxy_lookup(struct device *consumer, 31 struct fwnode_handle *fwnode, 32 const char *con_id, 33 unsigned long lflags) 34 { 35 return 0; 36 } 37 38 #endif /* CONFIG_GPIO_SHARED */ 39 40 struct gpio_shared_desc { 41 struct gpio_desc *desc; 42 unsigned long cfg; 43 unsigned int usecnt; 44 unsigned int votecnt; 45 int def_val; 46 struct mutex mutex; /* serializes all proxy operations on this descriptor */ 47 }; 48 49 struct gpio_shared_desc *devm_gpiod_shared_get(struct device *dev); 50 51 #endif /* __LINUX_GPIO_SHARED_H */ 52