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113 lines
3.9 KiB
113 lines
3.9 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __LINUX_GPIO_MACHINE_H |
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#define __LINUX_GPIO_MACHINE_H |
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#include <linux/types.h> |
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#include <linux/list.h> |
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enum gpio_lookup_flags { |
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GPIO_ACTIVE_HIGH = (0 << 0), |
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GPIO_ACTIVE_LOW = (1 << 0), |
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GPIO_OPEN_DRAIN = (1 << 1), |
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GPIO_OPEN_SOURCE = (1 << 2), |
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GPIO_PERSISTENT = (0 << 3), |
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GPIO_TRANSITORY = (1 << 3), |
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GPIO_PULL_UP = (1 << 4), |
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GPIO_PULL_DOWN = (1 << 5), |
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GPIO_LOOKUP_FLAGS_DEFAULT = GPIO_ACTIVE_HIGH | GPIO_PERSISTENT, |
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}; |
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/** |
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* struct gpiod_lookup - lookup table |
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* @key: either the name of the chip the GPIO belongs to, or the GPIO line name |
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* Note that GPIO line names are not guaranteed to be globally unique, |
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* so this will use the first match found! |
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* @chip_hwnum: hardware number (i.e. relative to the chip) of the GPIO, or |
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* U16_MAX to indicate that @key is a GPIO line name |
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* @con_id: name of the GPIO from the device's point of view |
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* @idx: index of the GPIO in case several GPIOs share the same name |
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* @flags: bitmask of gpio_lookup_flags GPIO_* values |
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* |
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* gpiod_lookup is a lookup table for associating GPIOs to specific devices and |
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* functions using platform data. |
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*/ |
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struct gpiod_lookup { |
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const char *key; |
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u16 chip_hwnum; |
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const char *con_id; |
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unsigned int idx; |
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unsigned long flags; |
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}; |
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struct gpiod_lookup_table { |
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struct list_head list; |
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const char *dev_id; |
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struct gpiod_lookup table[]; |
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}; |
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/** |
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* struct gpiod_hog - GPIO line hog table |
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* @chip_label: name of the chip the GPIO belongs to |
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* @chip_hwnum: hardware number (i.e. relative to the chip) of the GPIO |
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* @line_name: consumer name for the hogged line |
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* @lflags: bitmask of gpio_lookup_flags GPIO_* values |
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* @dflags: GPIO flags used to specify the direction and value |
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*/ |
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struct gpiod_hog { |
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struct list_head list; |
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const char *chip_label; |
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u16 chip_hwnum; |
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const char *line_name; |
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unsigned long lflags; |
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int dflags; |
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}; |
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/* |
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* Simple definition of a single GPIO under a con_id |
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*/ |
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#define GPIO_LOOKUP(_key, _chip_hwnum, _con_id, _flags) \ |
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GPIO_LOOKUP_IDX(_key, _chip_hwnum, _con_id, 0, _flags) |
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/* |
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* Use this macro if you need to have several GPIOs under the same con_id. |
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* Each GPIO needs to use a different index and can be accessed using |
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* gpiod_get_index() |
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*/ |
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#define GPIO_LOOKUP_IDX(_key, _chip_hwnum, _con_id, _idx, _flags) \ |
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(struct gpiod_lookup) { \ |
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.key = _key, \ |
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.chip_hwnum = _chip_hwnum, \ |
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.con_id = _con_id, \ |
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.idx = _idx, \ |
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.flags = _flags, \ |
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} |
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/* |
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* Simple definition of a single GPIO hog in an array. |
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*/ |
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#define GPIO_HOG(_chip_label, _chip_hwnum, _line_name, _lflags, _dflags) \ |
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(struct gpiod_hog) { \ |
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.chip_label = _chip_label, \ |
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.chip_hwnum = _chip_hwnum, \ |
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.line_name = _line_name, \ |
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.lflags = _lflags, \ |
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.dflags = _dflags, \ |
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} |
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#ifdef CONFIG_GPIOLIB |
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void gpiod_add_lookup_table(struct gpiod_lookup_table *table); |
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void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n); |
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void gpiod_remove_lookup_table(struct gpiod_lookup_table *table); |
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void gpiod_add_hogs(struct gpiod_hog *hogs); |
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#else /* ! CONFIG_GPIOLIB */ |
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static inline |
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void gpiod_add_lookup_table(struct gpiod_lookup_table *table) {} |
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static inline |
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void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n) {} |
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static inline |
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void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) {} |
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static inline void gpiod_add_hogs(struct gpiod_hog *hogs) {} |
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#endif /* CONFIG_GPIOLIB */ |
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#endif /* __LINUX_GPIO_MACHINE_H */
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