1dae5f0afSLinus Walleij /* SPDX-License-Identifier: GPL-2.0 */ 2664e3e5aSMika Westerberg /* 3664e3e5aSMika Westerberg * Internal GPIO functions. 4664e3e5aSMika Westerberg * 5664e3e5aSMika Westerberg * Copyright (C) 2013, Intel Corporation 6664e3e5aSMika Westerberg * Author: Mika Westerberg <mika.westerberg@linux.intel.com> 7664e3e5aSMika Westerberg */ 8664e3e5aSMika Westerberg 9664e3e5aSMika Westerberg #ifndef GPIOLIB_H 10664e3e5aSMika Westerberg #define GPIOLIB_H 11664e3e5aSMika Westerberg 12ff2b1359SLinus Walleij #include <linux/gpio/driver.h> 1363f2dc0aSLinus Walleij #include <linux/gpio/consumer.h> /* for enum gpiod_flags */ 145ccff852SMika Westerberg #include <linux/err.h> 155ccff852SMika Westerberg #include <linux/device.h> 16ff2b1359SLinus Walleij #include <linux/module.h> 17ff2b1359SLinus Walleij #include <linux/cdev.h> 18bdbbae24SBartosz Golaszewski #include <linux/rwsem.h> 195ccff852SMika Westerberg 20ddd8891eSGeert Uytterhoeven #define GPIOCHIP_NAME "gpiochip" 21ddd8891eSGeert Uytterhoeven 225ccff852SMika Westerberg /** 23ff2b1359SLinus Walleij * struct gpio_device - internal state container for GPIO devices 24ff2b1359SLinus Walleij * @dev: the GPIO device struct 253c702e99SLinus Walleij * @chrdev: character device for the GPIO device 263b7c7478SAndy Shevchenko * @id: numerical ID number for the GPIO chip 27afbc4f31SLinus Walleij * @mockdev: class device used by the deprecated sysfs interface (may be 28afbc4f31SLinus Walleij * NULL) 29ff2b1359SLinus Walleij * @owner: helps prevent removal of modules exporting active GPIOs 30ff2b1359SLinus Walleij * @chip: pointer to the corresponding gpiochip, holding static 31ff2b1359SLinus Walleij * data for this device 321c3cdb18SLinus Walleij * @descs: array of ngpio descriptors. 33fdeb8e15SLinus Walleij * @ngpio: the number of GPIO lines on this GPIO device, equal to the size 34fdeb8e15SLinus Walleij * of the @descs array. 35fdeb8e15SLinus Walleij * @base: GPIO base in the DEPRECATED global Linux GPIO numberspace, assigned 36fdeb8e15SLinus Walleij * at device creation time. 37df4878e9SLinus Walleij * @label: a descriptive name for the GPIO device, such as the part number 38df4878e9SLinus Walleij * or name of the IP component in a System on Chip. 3943c54ecaSLinus Walleij * @data: per-instance data assigned by the driver 40ff2b1359SLinus Walleij * @list: links gpio_device:s together for traversal 414398693aSBartosz Golaszewski * @notifier: used to notify subscribers about lines being requested, released 424398693aSBartosz Golaszewski * or reconfigured 43bdbbae24SBartosz Golaszewski * @sem: protects the structure from a NULL-pointer dereference of @chip by 44bdbbae24SBartosz Golaszewski * user-space operations when the device gets unregistered during 45bdbbae24SBartosz Golaszewski * a hot-unplug event 464398693aSBartosz Golaszewski * @pin_ranges: range of pins served by the GPIO driver 47ff2b1359SLinus Walleij * 48ff2b1359SLinus Walleij * This state container holds most of the runtime variable data 49ff2b1359SLinus Walleij * for a GPIO device and can hold references and live on after the 50ff2b1359SLinus Walleij * GPIO chip has been removed, if it is still being used from 51ff2b1359SLinus Walleij * userspace. 52ff2b1359SLinus Walleij */ 53ff2b1359SLinus Walleij struct gpio_device { 54ff2b1359SLinus Walleij struct device dev; 553c702e99SLinus Walleij struct cdev chrdev; 563b7c7478SAndy Shevchenko int id; 57afbc4f31SLinus Walleij struct device *mockdev; 58ff2b1359SLinus Walleij struct module *owner; 59ff2b1359SLinus Walleij struct gpio_chip *chip; 601c3cdb18SLinus Walleij struct gpio_desc *descs; 61fdeb8e15SLinus Walleij int base; 62fdeb8e15SLinus Walleij u16 ngpio; 633b469b0aSBartosz Golaszewski const char *label; 6443c54ecaSLinus Walleij void *data; 65ff2b1359SLinus Walleij struct list_head list; 666accc376SKent Gibson struct blocking_notifier_head notifier; 67bdbbae24SBartosz Golaszewski struct rw_semaphore sem; 6820ec3e39SLinus Walleij 6920ec3e39SLinus Walleij #ifdef CONFIG_PINCTRL 7020ec3e39SLinus Walleij /* 7120ec3e39SLinus Walleij * If CONFIG_PINCTRL is enabled, then gpio controllers can optionally 7220ec3e39SLinus Walleij * describe the actual pin range which they serve in an SoC. This 7320ec3e39SLinus Walleij * information would be used by pinctrl subsystem to configure 7420ec3e39SLinus Walleij * corresponding pins for gpio usage. 7520ec3e39SLinus Walleij */ 7620ec3e39SLinus Walleij struct list_head pin_ranges; 7720ec3e39SLinus Walleij #endif 78ff2b1359SLinus Walleij }; 79ff2b1359SLinus Walleij 803b7c7478SAndy Shevchenko static inline struct gpio_device *to_gpio_device(struct device *dev) 813b7c7478SAndy Shevchenko { 823b7c7478SAndy Shevchenko return container_of(dev, struct gpio_device, dev); 833b7c7478SAndy Shevchenko } 843b7c7478SAndy Shevchenko 85*dc0989e3SAndy Shevchenko static inline struct gpio_device *gpio_device_get(struct gpio_device *gdev) 86*dc0989e3SAndy Shevchenko { 87*dc0989e3SAndy Shevchenko return to_gpio_device(get_device(&gdev->dev)); 88*dc0989e3SAndy Shevchenko } 89*dc0989e3SAndy Shevchenko 90*dc0989e3SAndy Shevchenko static inline void gpio_device_put(struct gpio_device *gdev) 91*dc0989e3SAndy Shevchenko { 92*dc0989e3SAndy Shevchenko put_device(&gdev->dev); 93*dc0989e3SAndy Shevchenko } 94*dc0989e3SAndy Shevchenko 957f2e553aSRojhalat Ibrahim /* gpio suffixes used for ACPI and device tree lookup */ 96b23ec599SAndy Shevchenko static __maybe_unused const char * const gpio_suffixes[] = { "gpios", "gpio" }; 977f2e553aSRojhalat Ibrahim 984398693aSBartosz Golaszewski /** 994398693aSBartosz Golaszewski * struct gpio_array - Opaque descriptor for a structure of GPIO array attributes 1004398693aSBartosz Golaszewski * 1014398693aSBartosz Golaszewski * @desc: Array of pointers to the GPIO descriptors 1024398693aSBartosz Golaszewski * @size: Number of elements in desc 1034398693aSBartosz Golaszewski * @chip: Parent GPIO chip 1044398693aSBartosz Golaszewski * @get_mask: Get mask used in fastpath 1054398693aSBartosz Golaszewski * @set_mask: Set mask used in fastpath 1064398693aSBartosz Golaszewski * @invert_mask: Invert mask used in fastpath 1074398693aSBartosz Golaszewski * 1084398693aSBartosz Golaszewski * This structure is attached to struct gpiod_descs obtained from 1094398693aSBartosz Golaszewski * gpiod_get_array() and can be passed back to get/set array functions in order 1104398693aSBartosz Golaszewski * to activate fast processing path if applicable. 1114398693aSBartosz Golaszewski */ 112bf9346f5SJanusz Krzysztofik struct gpio_array { 113bf9346f5SJanusz Krzysztofik struct gpio_desc **desc; 114bf9346f5SJanusz Krzysztofik unsigned int size; 115bf9346f5SJanusz Krzysztofik struct gpio_chip *chip; 116bf9346f5SJanusz Krzysztofik unsigned long *get_mask; 117bf9346f5SJanusz Krzysztofik unsigned long *set_mask; 118bf9346f5SJanusz Krzysztofik unsigned long invert_mask[]; 119bf9346f5SJanusz Krzysztofik }; 120bf9346f5SJanusz Krzysztofik 121a5e93436SGeert Uytterhoeven struct gpio_desc *gpiochip_get_desc(struct gpio_chip *gc, unsigned int hwnum); 12280c78fbeSAndy Shevchenko 12366f46e37SAndy Shevchenko #define for_each_gpio_desc(gc, desc) \ 12457017eddSAndy Shevchenko for (unsigned int __i = 0; \ 12557017eddSAndy Shevchenko __i < gc->ngpio && (desc = gpiochip_get_desc(gc, __i)); \ 12657017eddSAndy Shevchenko __i++) \ 12766f46e37SAndy Shevchenko 12866f46e37SAndy Shevchenko #define for_each_gpio_desc_with_flag(gc, desc, flag) \ 12966f46e37SAndy Shevchenko for_each_gpio_desc(gc, desc) \ 13080c78fbeSAndy Shevchenko if (!test_bit(flag, &desc->flags)) {} else 13180c78fbeSAndy Shevchenko 132eec1d566SLukas Wunner int gpiod_get_array_value_complex(bool raw, bool can_sleep, 133eec1d566SLukas Wunner unsigned int array_size, 134eec1d566SLukas Wunner struct gpio_desc **desc_array, 13577588c14SJanusz Krzysztofik struct gpio_array *array_info, 136b9762bebSJanusz Krzysztofik unsigned long *value_bitmap); 1373027743fSLaura Abbott int gpiod_set_array_value_complex(bool raw, bool can_sleep, 13844c7288fSLinus Walleij unsigned int array_size, 13944c7288fSLinus Walleij struct gpio_desc **desc_array, 14077588c14SJanusz Krzysztofik struct gpio_array *array_info, 141b9762bebSJanusz Krzysztofik unsigned long *value_bitmap); 1421bd6b601SAlexandre Courbot 143f0b40863SSebastian Andrzej Siewior extern spinlock_t gpio_lock; 144ff2b1359SLinus Walleij extern struct list_head gpio_devices; 1450eb4c6c2SAlexandre Courbot 1464398693aSBartosz Golaszewski 1474398693aSBartosz Golaszewski /** 1484398693aSBartosz Golaszewski * struct gpio_desc - Opaque descriptor for a GPIO 1494398693aSBartosz Golaszewski * 1504398693aSBartosz Golaszewski * @gdev: Pointer to the parent GPIO device 1514398693aSBartosz Golaszewski * @flags: Binary descriptor flags 1524398693aSBartosz Golaszewski * @label: Name of the consumer 1534398693aSBartosz Golaszewski * @name: Line name 1544398693aSBartosz Golaszewski * @hog: Pointer to the device node that hogs this line (if any) 1554398693aSBartosz Golaszewski * @debounce_period_us: Debounce period in microseconds 1564398693aSBartosz Golaszewski * 1574398693aSBartosz Golaszewski * These are obtained using gpiod_get() and are preferable to the old 1584398693aSBartosz Golaszewski * integer-based handles. 1594398693aSBartosz Golaszewski * 1604398693aSBartosz Golaszewski * Contrary to integers, a pointer to a &struct gpio_desc is guaranteed to be 1614398693aSBartosz Golaszewski * valid until the GPIO is released. 1624398693aSBartosz Golaszewski */ 1630eb4c6c2SAlexandre Courbot struct gpio_desc { 164fdeb8e15SLinus Walleij struct gpio_device *gdev; 1650eb4c6c2SAlexandre Courbot unsigned long flags; 1660eb4c6c2SAlexandre Courbot /* flag symbols are bit numbers */ 1670eb4c6c2SAlexandre Courbot #define FLAG_REQUESTED 0 1680eb4c6c2SAlexandre Courbot #define FLAG_IS_OUT 1 1690eb4c6c2SAlexandre Courbot #define FLAG_EXPORT 2 /* protected by sysfs_lock */ 1700eb4c6c2SAlexandre Courbot #define FLAG_SYSFS 3 /* exported via /sys/class/gpio/control */ 1710eb4c6c2SAlexandre Courbot #define FLAG_ACTIVE_LOW 6 /* value has active low */ 1720eb4c6c2SAlexandre Courbot #define FLAG_OPEN_DRAIN 7 /* Gpio is open drain type */ 1730eb4c6c2SAlexandre Courbot #define FLAG_OPEN_SOURCE 8 /* Gpio is open source type */ 1740eb4c6c2SAlexandre Courbot #define FLAG_USED_AS_IRQ 9 /* GPIO is connected to an IRQ */ 1754e9439ddSHans Verkuil #define FLAG_IRQ_IS_ENABLED 10 /* GPIO is connected to an enabled IRQ */ 176f625d460SBenoit Parrot #define FLAG_IS_HOGGED 11 /* GPIO is hogged */ 177e10f72bfSAndrew Jeffery #define FLAG_TRANSITORY 12 /* GPIO may lose value in sleep or reset */ 178d449991cSThomas Petazzoni #define FLAG_PULL_UP 13 /* GPIO has pull up enabled */ 179d449991cSThomas Petazzoni #define FLAG_PULL_DOWN 14 /* GPIO has pull down enabled */ 1802148ad77SKent Gibson #define FLAG_BIAS_DISABLE 15 /* GPIO has pull disabled */ 18173e03419SKent Gibson #define FLAG_EDGE_RISING 16 /* GPIO CDEV detects rising edge events */ 18273e03419SKent Gibson #define FLAG_EDGE_FALLING 17 /* GPIO CDEV detects falling edge events */ 18326d060e4SKent Gibson #define FLAG_EVENT_CLOCK_REALTIME 18 /* GPIO CDEV reports REALTIME timestamps in events */ 18442112dd7SDipen Patel #define FLAG_EVENT_CLOCK_HTE 19 /* GPIO CDEV reports hardware timestamps in events */ 1850eb4c6c2SAlexandre Courbot 186c0017ed7SMarkus Pargmann /* Connection label */ 1870eb4c6c2SAlexandre Courbot const char *label; 188c0017ed7SMarkus Pargmann /* Name of the GPIO */ 189c0017ed7SMarkus Pargmann const char *name; 19063636d95SGeert Uytterhoeven #ifdef CONFIG_OF_DYNAMIC 19163636d95SGeert Uytterhoeven struct device_node *hog; 19263636d95SGeert Uytterhoeven #endif 19365cff704SKent Gibson #ifdef CONFIG_GPIO_CDEV 19465cff704SKent Gibson /* debounce period in microseconds */ 19565cff704SKent Gibson unsigned int debounce_period_us; 19665cff704SKent Gibson #endif 1970eb4c6c2SAlexandre Courbot }; 1980eb4c6c2SAlexandre Courbot 1997b58696dSAndy Shevchenko #define gpiod_not_found(desc) (IS_ERR(desc) && PTR_ERR(desc) == -ENOENT) 2007b58696dSAndy Shevchenko 2010eb4c6c2SAlexandre Courbot int gpiod_request(struct gpio_desc *desc, const char *label); 2020eb4c6c2SAlexandre Courbot void gpiod_free(struct gpio_desc *desc); 20395a4eed7SAndy Shevchenko 20495a4eed7SAndy Shevchenko static inline int gpiod_request_user(struct gpio_desc *desc, const char *label) 20595a4eed7SAndy Shevchenko { 20695a4eed7SAndy Shevchenko int ret; 20795a4eed7SAndy Shevchenko 20895a4eed7SAndy Shevchenko ret = gpiod_request(desc, label); 20995a4eed7SAndy Shevchenko if (ret == -EPROBE_DEFER) 21095a4eed7SAndy Shevchenko ret = -ENODEV; 21195a4eed7SAndy Shevchenko 21295a4eed7SAndy Shevchenko return ret; 21395a4eed7SAndy Shevchenko } 21495a4eed7SAndy Shevchenko 215c29fd9ebSAndy Shevchenko int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id, 216c29fd9ebSAndy Shevchenko unsigned long lflags, enum gpiod_flags dflags); 217f725edd8SAndy Shevchenko int gpio_set_debounce_timeout(struct gpio_desc *desc, unsigned int debounce); 218f625d460SBenoit Parrot int gpiod_hog(struct gpio_desc *desc, const char *name, 219f625d460SBenoit Parrot unsigned long lflags, enum gpiod_flags dflags); 2200eb4c6c2SAlexandre Courbot 2210eb4c6c2SAlexandre Courbot /* 2220eb4c6c2SAlexandre Courbot * Return the GPIO number of the passed descriptor relative to its chip 2230eb4c6c2SAlexandre Courbot */ 2244a5c886eSMasahiro Yamada static inline int gpio_chip_hwgpio(const struct gpio_desc *desc) 2250eb4c6c2SAlexandre Courbot { 226fdeb8e15SLinus Walleij return desc - &desc->gdev->descs[0]; 2270eb4c6c2SAlexandre Courbot } 2280eb4c6c2SAlexandre Courbot 2290eb4c6c2SAlexandre Courbot /* With descriptor prefix */ 2300eb4c6c2SAlexandre Courbot 2310eb4c6c2SAlexandre Courbot #define gpiod_emerg(desc, fmt, ...) \ 2320eb4c6c2SAlexandre Courbot pr_emerg("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\ 2330eb4c6c2SAlexandre Courbot ##__VA_ARGS__) 2340eb4c6c2SAlexandre Courbot #define gpiod_crit(desc, fmt, ...) \ 2350eb4c6c2SAlexandre Courbot pr_crit("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \ 2360eb4c6c2SAlexandre Courbot ##__VA_ARGS__) 2370eb4c6c2SAlexandre Courbot #define gpiod_err(desc, fmt, ...) \ 2380eb4c6c2SAlexandre Courbot pr_err("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \ 2390eb4c6c2SAlexandre Courbot ##__VA_ARGS__) 2400eb4c6c2SAlexandre Courbot #define gpiod_warn(desc, fmt, ...) \ 2410eb4c6c2SAlexandre Courbot pr_warn("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \ 2420eb4c6c2SAlexandre Courbot ##__VA_ARGS__) 2430eb4c6c2SAlexandre Courbot #define gpiod_info(desc, fmt, ...) \ 2440eb4c6c2SAlexandre Courbot pr_info("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \ 2450eb4c6c2SAlexandre Courbot ##__VA_ARGS__) 2460eb4c6c2SAlexandre Courbot #define gpiod_dbg(desc, fmt, ...) \ 2470eb4c6c2SAlexandre Courbot pr_debug("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\ 2480eb4c6c2SAlexandre Courbot ##__VA_ARGS__) 2490eb4c6c2SAlexandre Courbot 2500eb4c6c2SAlexandre Courbot /* With chip prefix */ 2510eb4c6c2SAlexandre Courbot 252a5e93436SGeert Uytterhoeven #define chip_emerg(gc, fmt, ...) \ 253a5e93436SGeert Uytterhoeven dev_emerg(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__) 254a5e93436SGeert Uytterhoeven #define chip_crit(gc, fmt, ...) \ 255a5e93436SGeert Uytterhoeven dev_crit(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__) 256a5e93436SGeert Uytterhoeven #define chip_err(gc, fmt, ...) \ 257a5e93436SGeert Uytterhoeven dev_err(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__) 258a5e93436SGeert Uytterhoeven #define chip_warn(gc, fmt, ...) \ 259a5e93436SGeert Uytterhoeven dev_warn(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__) 260a5e93436SGeert Uytterhoeven #define chip_info(gc, fmt, ...) \ 261a5e93436SGeert Uytterhoeven dev_info(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__) 262a5e93436SGeert Uytterhoeven #define chip_dbg(gc, fmt, ...) \ 263a5e93436SGeert Uytterhoeven dev_dbg(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__) 2640eb4c6c2SAlexandre Courbot 265664e3e5aSMika Westerberg #endif /* GPIOLIB_H */ 266