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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_GENERIC_GPIO_H
#define _ASM_GENERIC_GPIO_H

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/of.h>

#ifdef CONFIG_GPIOLIB

#include <linux/compiler.h>
#include <linux/gpio/driver.h>
#include <linux/gpio/consumer.h>

/* Platforms may implement their GPIO interface with library code,
 * at a small performance cost for non-inlined operations and some
 * extra memory (for code and for per-GPIO table entries).
 *
 * While the GPIO programming interface defines valid GPIO numbers
 * to be in the range 0..MAX_INT, this library restricts them to the
 * smaller range 0..ARCH_NR_GPIOS-1.
 *
 * ARCH_NR_GPIOS is somewhat arbitrary; it usually reflects the sum of
 * builtin/SoC GPIOs plus a number of GPIOs on expanders; the latter is
 * actually an estimate of a board-specific value.
 */

#ifndef ARCH_NR_GPIOS
#if defined(CONFIG_ARCH_NR_GPIO) && CONFIG_ARCH_NR_GPIO > 0
#define ARCH_NR_GPIOS CONFIG_ARCH_NR_GPIO
#else
#define ARCH_NR_GPIOS		512
#endif
#endif

/*
 * "valid" GPIO numbers are nonnegative and may be passed to
 * setup routines like gpio_request().  only some valid numbers
 * can successfully be requested and used.
 *
 * Invalid GPIO numbers are useful for indicating no-such-GPIO in
 * platform data and other tables.
 */

static inline bool gpio_is_valid(int number)
{
	return number >= 0 && number < ARCH_NR_GPIOS;
}

struct device;
struct gpio;
struct seq_file;
struct module;
struct device_node;
struct gpio_desc;

/* caller holds gpio_lock *OR* gpio is marked as requested */
static inline struct gpio_chip *gpio_to_chip(unsigned gpio)
{
	return gpiod_to_chip(gpio_to_desc(gpio));
}

/* Always use the library code for GPIO management calls,
 * or when sleeping may be involved.
 */
extern int gpio_request(unsigned gpio, const char *label);
extern void gpio_free(unsigned gpio);

static inline int gpio_direction_input(unsigned gpio)
{
	return gpiod_direction_input(gpio_to_desc(gpio));
}
static inline int gpio_direction_output(unsigned gpio, int value)
{
	return gpiod_direction_output_raw(gpio_to_desc(gpio), value);
}

static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
{
	return gpiod_set_debounce(gpio_to_desc(gpio), debounce);
}

static inline int gpio_get_value_cansleep(unsigned gpio)
{
	return gpiod_get_raw_value_cansleep(gpio_to_desc(gpio));
}
static inline void gpio_set_value_cansleep(unsigned gpio, int value)
{
	return gpiod_set_raw_value_cansleep(gpio_to_desc(gpio), value);
}


/* A platform's <asm/gpio.h> code may want to inline the I/O calls when
 * the GPIO is constant and refers to some always-present controller,
 * giving direct access to chip registers and tight bitbanging loops.
 */
static inline int __gpio_get_value(unsigned gpio)
{
	return gpiod_get_raw_value(gpio_to_desc(gpio));
}
static inline void __gpio_set_value(unsigned gpio, int value)
{
	return gpiod_set_raw_value(gpio_to_desc(gpio), value);
}

static inline int __gpio_cansleep(unsigned gpio)
{
	return gpiod_cansleep(gpio_to_desc(gpio));
}

static inline int __gpio_to_irq(unsigned gpio)
{
	return gpiod_to_irq(gpio_to_desc(gpio));
}

extern int gpio_request_one(unsigned gpio, unsigned long flags, const char *label);
extern int gpio_request_array(const struct gpio *array, size_t num);
extern void gpio_free_array(const struct gpio *array, size_t num);

/*
 * A sysfs interface can be exported by individual drivers if they want,
 * but more typically is configured entirely from userspace.
 */
static inline int gpio_export(unsigned gpio, bool direction_may_change)
{
	return gpiod_export(gpio_to_desc(gpio), direction_may_change);
}

static inline int gpio_export_link(struct device *dev, const char *name,
				   unsigned gpio)
{
	return gpiod_export_link(dev, name, gpio_to_desc(gpio));
}

static inline void gpio_unexport(unsigned gpio)
{
	gpiod_unexport(gpio_to_desc(gpio));
}

#else	/* !CONFIG_GPIOLIB */

static inline bool gpio_is_valid(int number)
{
	/* only non-negative numbers are valid */
	return number >= 0;
}

/* platforms that don't directly support access to GPIOs through I2C, SPI,
 * or other blocking infrastructure can use these wrappers.
 */

static inline int gpio_cansleep(unsigned gpio)
{
	return 0;
}

static inline int gpio_get_value_cansleep(unsigned gpio)
{
	might_sleep();
	return __gpio_get_value(gpio);
}

static inline void gpio_set_value_cansleep(unsigned gpio, int value)
{
	might_sleep();
	__gpio_set_value(gpio, value);
}

#endif /* !CONFIG_GPIOLIB */

#endif /* _ASM_GENERIC_GPIO_H */

Filemanager

Name Type Size Permission Actions
bitops Folder 0755
4level-fixup.h File 1.07 KB 0644
5level-fixup.h File 1.15 KB 0644
asm-offsets.h File 35 B 0644
asm-prototypes.h File 507 B 0644
atomic-long.h File 7.09 KB 0644
atomic.h File 5.11 KB 0644
atomic64.h File 2.26 KB 0644
audit_change_attr.h File 484 B 0644
audit_dir_write.h File 500 B 0644
audit_read.h File 241 B 0644
audit_signal.h File 36 B 0644
audit_write.h File 461 B 0644
barrier.h File 6.01 KB 0644
bitops.h File 1.09 KB 0644
bitsperlong.h File 592 B 0644
bug.h File 6.6 KB 0644
bugs.h File 267 B 0644
cache.h File 384 B 0644
cacheflush.h File 1.31 KB 0644
checksum.h File 2.27 KB 0644
clkdev.h File 706 B 0644
cmpxchg-local.h File 1.43 KB 0644
cmpxchg.h File 2.23 KB 0644
current.h File 256 B 0644
delay.h File 1.13 KB 0644
device.h File 245 B 0644
div64.h File 7.28 KB 0644
dma-contiguous.h File 238 B 0644
dma.h File 553 B 0644
early_ioremap.h File 1.66 KB 0644
emergency-restart.h File 248 B 0644
exec.h File 697 B 0644
export.h File 2.2 KB 0644
extable.h File 802 B 0644
fb.h File 271 B 0644
fixmap.h File 2.84 KB 0644
ftrace.h File 460 B 0644
futex.h File 2.88 KB 0644
getorder.h File 1.22 KB 0644
gpio.h File 4.45 KB 0644
hardirq.h File 532 B 0644
hugetlb.h File 845 B 0644
hw_irq.h File 270 B 0644
ide_iops.h File 791 B 0644
int-ll64.h File 932 B 0644
io.h File 20.39 KB 0644
ioctl.h File 506 B 0644
iomap.h File 3.16 KB 0644
irq.h File 403 B 0644
irq_regs.h File 980 B 0644
irq_work.h File 194 B 0644
irqflags.h File 1.51 KB 0644
kdebug.h File 182 B 0644
kmap_types.h File 198 B 0644
kprobes.h File 868 B 0644
kvm_para.h File 480 B 0644
linkage.h File 225 B 0644
local.h File 2.23 KB 0644
local64.h File 3.8 KB 0644
mcs_spinlock.h File 260 B 0644
memory_model.h File 2.16 KB 0644
mm-arch-hooks.h File 388 B 0644
mm_hooks.h File 885 B 0644
mmu.h File 449 B 0644
mmu_context.h File 881 B 0644
module.h File 1.09 KB 0644
msi.h File 838 B 0644
page.h File 2.4 KB 0644
param.h File 367 B 0644
parport.h File 604 B 0644
pci.h File 581 B 0644
pci_iomap.h File 1.96 KB 0644
percpu.h File 12.72 KB 0644
pgalloc.h File 342 B 0644
pgtable-nop4d-hack.h File 1.86 KB 0644
pgtable-nop4d.h File 1.64 KB 0644
pgtable-nopmd.h File 1.9 KB 0644
pgtable-nopud.h File 1.97 KB 0644
pgtable.h File 29.5 KB 0644
preempt.h File 1.94 KB 0644
ptrace.h File 1.58 KB 0644
qrwlock.h File 3.78 KB 0644
qrwlock_types.h File 655 B 0644
qspinlock.h File 3.67 KB 0644
qspinlock_types.h File 2.77 KB 0644
resource.h File 1.07 KB 0644
rwsem.h File 3.21 KB 0644
seccomp.h File 1.3 KB 0644
sections.h File 4.8 KB 0644
segment.h File 249 B 0644
serial.h File 345 B 0644
set_memory.h File 362 B 0644
signal.h File 308 B 0644
simd.h File 436 B 0644
sizes.h File 78 B 0644
spinlock.h File 329 B 0644
statfs.h File 169 B 0644
string.h File 281 B 0644
switch_to.h File 992 B 0644
syscall.h File 6.18 KB 0644
syscalls.h File 739 B 0644
termios-base.h File 2.11 KB 0644
termios.h File 2.81 KB 0644
timex.h File 508 B 0644
tlb.h File 9.4 KB 0644
tlbflush.h File 485 B 0644
topology.h File 2.18 KB 0644
trace_clock.h File 391 B 0644
uaccess.h File 5.22 KB 0644
unaligned.h File 1.05 KB 0644
unistd.h File 318 B 0644
user.h File 242 B 0644
vga.h File 587 B 0644
vmlinux.lds.h File 29.17 KB 0644
vtime.h File 52 B 0644
word-at-a-time.h File 2.75 KB 0644
xor.h File 13.63 KB 0644