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authorShawn Guo <shawn.guo@linaro.org>2012-05-19 17:34:58 +0400
committerGrant Likely <grant.likely@secretlab.ca>2012-05-19 22:17:35 +0400
commit3e11f7b840b4671213c66817294ad7dd0b572756 (patch)
treefc9246cd2e491e8c9b6f7cec994da2b314b7c4ca /drivers/gpio/gpio-generic.c
parent07ce8ec7308ab3fa55fe2861671b157f857fff58 (diff)
downloadlinux-3e11f7b840b4671213c66817294ad7dd0b572756.tar.xz
gpio/generic: initialize basic_mmio_gpio shadow variables properly
It fixes the issue in gpio-generic that commit fb14921 (gpio/mxc: add missing initialization of basic_mmio_gpio shadow variables) manged to fix in gpio-mxc driver, so that other platform specific drivers do not suffer from the same problem over and over again. Changes since v1: * Turn the last parameter of bgpio_init() "bool big_endian" into "unsigned long flags" and give those really quirky hardwares a chance to tell that reg_set and reg_dir are unreadable. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> [grant.likely: Fix big-endian usage to explicitly set BBGPIOF_BIG_ENDIAN] Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/gpio/gpio-generic.c')
-rw-r--r--drivers/gpio/gpio-generic.c16
1 files changed, 11 insertions, 5 deletions
diff --git a/drivers/gpio/gpio-generic.c b/drivers/gpio/gpio-generic.c
index e38dd0c31973..82e2e4fe599e 100644
--- a/drivers/gpio/gpio-generic.c
+++ b/drivers/gpio/gpio-generic.c
@@ -364,7 +364,7 @@ EXPORT_SYMBOL_GPL(bgpio_remove);
int bgpio_init(struct bgpio_chip *bgc, struct device *dev,
unsigned long sz, void __iomem *dat, void __iomem *set,
void __iomem *clr, void __iomem *dirout, void __iomem *dirin,
- bool big_endian)
+ unsigned long flags)
{
int ret;
@@ -385,7 +385,7 @@ int bgpio_init(struct bgpio_chip *bgc, struct device *dev,
if (ret)
return ret;
- ret = bgpio_setup_accessors(dev, bgc, big_endian);
+ ret = bgpio_setup_accessors(dev, bgc, flags & BGPIOF_BIG_ENDIAN);
if (ret)
return ret;
@@ -394,6 +394,11 @@ int bgpio_init(struct bgpio_chip *bgc, struct device *dev,
return ret;
bgc->data = bgc->read_reg(bgc->reg_dat);
+ if (bgc->gc.set == bgpio_set_set &&
+ !(flags & BGPIOF_UNREADABLE_REG_SET))
+ bgc->data = bgc->read_reg(bgc->reg_set);
+ if (bgc->reg_dir && !(flags & BGPIOF_UNREADABLE_REG_DIR))
+ bgc->dir = bgc->read_reg(bgc->reg_dir);
return ret;
}
@@ -449,7 +454,7 @@ static int __devinit bgpio_pdev_probe(struct platform_device *pdev)
void __iomem *dirout;
void __iomem *dirin;
unsigned long sz;
- bool be;
+ unsigned long flags = 0;
int err;
struct bgpio_chip *bgc;
struct bgpio_pdata *pdata = dev_get_platdata(dev);
@@ -480,13 +485,14 @@ static int __devinit bgpio_pdev_probe(struct platform_device *pdev)
if (err)
return err;
- be = !strcmp(platform_get_device_id(pdev)->name, "basic-mmio-gpio-be");
+ if (!strcmp(platform_get_device_id(pdev)->name, "basic-mmio-gpio-be"))
+ flags |= BGPIOF_BIG_ENDIAN;
bgc = devm_kzalloc(&pdev->dev, sizeof(*bgc), GFP_KERNEL);
if (!bgc)
return -ENOMEM;
- err = bgpio_init(bgc, dev, sz, dat, set, clr, dirout, dirin, be);
+ err = bgpio_init(bgc, dev, sz, dat, set, clr, dirout, dirin, flags);
if (err)
return err;