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gpio/generic: initialize basic_mmio_gpio shadow variables properly

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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>
This commit is contained in:
Shawn Guo
2012-05-19 21:34:58 +08:00
committed by Grant Likely
parent 07ce8ec730
commit 3e11f7b840
6 changed files with 20 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/gpio/gpio-generic.c
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@@ -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;