arch/arm/mach-s3c/gpio-samsung.c

Source file repositories/reference/linux-study-clean/arch/arm/mach-s3c/gpio-samsung.c

File Facts

System
Linux kernel
Corpus path
arch/arm/mach-s3c/gpio-samsung.c
Extension
.c
Size
21629 bytes
Lines
891
Domain
Architecture Layer
Bucket
arch/arm
Inferred role
Architecture Layer: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

core_initcall(samsung_gpiolib_init);

int s3c_gpio_cfgpin(unsigned int pin, unsigned int config)
{
	struct samsung_gpio_chip *chip = samsung_gpiolib_getchip(pin);
	unsigned long flags;
	int offset;
	int ret;

	if (!chip)
		return -EINVAL;

	offset = pin - chip->chip.base;

	samsung_gpio_lock(chip, flags);
	ret = samsung_gpio_do_setcfg(chip, offset, config);
	samsung_gpio_unlock(chip, flags);

	return ret;
}
EXPORT_SYMBOL(s3c_gpio_cfgpin);

int s3c_gpio_cfgpin_range(unsigned int start, unsigned int nr,
			  unsigned int cfg)
{
	int ret;

	for (; nr > 0; nr--, start++) {
		ret = s3c_gpio_cfgpin(start, cfg);
		if (ret != 0)
			return ret;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(s3c_gpio_cfgpin_range);

int s3c_gpio_cfgall_range(unsigned int start, unsigned int nr,
			  unsigned int cfg, samsung_gpio_pull_t pull)
{
	int ret;

	for (; nr > 0; nr--, start++) {
		s3c_gpio_setpull(start, pull);
		ret = s3c_gpio_cfgpin(start, cfg);
		if (ret != 0)
			return ret;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(s3c_gpio_cfgall_range);

int s3c_gpio_setpull(unsigned int pin, samsung_gpio_pull_t pull)
{
	struct samsung_gpio_chip *chip = samsung_gpiolib_getchip(pin);
	unsigned long flags;
	int offset, ret;

	if (!chip)
		return -EINVAL;

	offset = pin - chip->chip.base;

	samsung_gpio_lock(chip, flags);
	ret = samsung_gpio_do_setpull(chip, offset, pull);
	samsung_gpio_unlock(chip, flags);

	return ret;
}
EXPORT_SYMBOL(s3c_gpio_setpull);

Annotation

Implementation Notes