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gpio: gpio-generic: add flag to read out output value from reg_set 

The change introduces BGPIOF_READ_OUTPUT_REG_SET flag for gpio-generic
GPIO chip implementation, which allows to get correct configured value
from reg_set register, input value is still get from reg_dat.

Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Vladimir Zapolskiy 2015-04-29 18:34:59 +03:00 committed by Linus Walleij
parent ff71880006
commit b19e7f51a5
2 changed files with 20 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/gpio/gpio-generic.c
View File

@ -135,6 +135,17 @@ static unsigned long bgpio_pin2mask_be(struct bgpio_chip *bgc,
return 1 << (bgc->bits - 1 - pin);
}
static int bgpio_get_set(struct gpio_chip *gc, unsigned int gpio)
{
struct bgpio_chip *bgc = to_bgpio_chip(gc);
unsigned long pinmask = bgc->pin2mask(bgc, gpio);
if (bgc->dir & pinmask)
return bgc->read_reg(bgc->reg_set) & pinmask;
else
return bgc->read_reg(bgc->reg_dat) & pinmask;
}
static int bgpio_get(struct gpio_chip *gc, unsigned int gpio)
{
struct bgpio_chip *bgc = to_bgpio_chip(gc);
@ -416,7 +427,8 @@ static int bgpio_setup_accessors(struct device *dev,
static int bgpio_setup_io(struct bgpio_chip *bgc,
void __iomem *dat,
void __iomem *set,
void __iomem *clr)
void __iomem *clr,
unsigned long flags)
{
bgc->reg_dat = dat;
@ -437,6 +449,10 @@ static int bgpio_setup_io(struct bgpio_chip *bgc,
bgc->gc.set_multiple = bgpio_set_multiple;
}
if (!(flags & BGPIOF_UNREADABLE_REG_SET) &&
(flags & BGPIOF_READ_OUTPUT_REG_SET))
bgc->gc.get = bgpio_get_set;
else
bgc->gc.get = bgpio_get;
return 0;
@ -500,7 +516,7 @@ int bgpio_init(struct bgpio_chip *bgc, struct device *dev,
bgc->gc.ngpio = bgc->bits;
bgc->gc.request = bgpio_request;
ret = bgpio_setup_io(bgc, dat, set, clr);
ret = bgpio_setup_io(bgc, dat, set, clr, flags);
if (ret)
return ret;

1
include/linux/basic_mmio_gpio.h
View File

@ -74,5 +74,6 @@ int bgpio_init(struct bgpio_chip *bgc, struct device *dev,
#define BGPIOF_UNREADABLE_REG_SET BIT(1) /* reg_set is unreadable */
#define BGPIOF_UNREADABLE_REG_DIR BIT(2) /* reg_dir is unreadable */
#define BGPIOF_BIG_ENDIAN_BYTE_ORDER BIT(3)
#define BGPIOF_READ_OUTPUT_REG_SET BIT(4) /* reg_set stores output value */
#endif /* __BASIC_MMIO_GPIO_H */