diff options
| author | Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com> | 2015-04-29 17:34:59 +0200 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2015-05-11 11:49:02 +0200 |
| commit | b19e7f51a55fe740c18038d1d6957aedfc078d07 (patch) | |
| tree | 69601960687fdab39deb1e3ac2b3cc809e356c52 /drivers/gpio/gpio-generic.c | |
| parent | gpio: xlp: GPIO controller for Netlogic XLP SoCs (diff) | |
| download | linux-b19e7f51a55fe740c18038d1d6957aedfc078d07.tar.xz linux-b19e7f51a55fe740c18038d1d6957aedfc078d07.zip | |
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>
Diffstat (limited to 'drivers/gpio/gpio-generic.c')
| -rw-r--r-- | drivers/gpio/gpio-generic.c | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/drivers/gpio/gpio-generic.c b/drivers/gpio/gpio-generic.c index b92a690f5765..9bda3727fac1 100644 --- a/drivers/gpio/gpio-generic.c +++ b/drivers/gpio/gpio-generic.c @@ -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; @@ -437,7 +449,11 @@ static int bgpio_setup_io(struct bgpio_chip *bgc, bgc->gc.set_multiple = bgpio_set_multiple; } - bgc->gc.get = bgpio_get; + 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; |