diff options
| author | Shawn Guo <shawn.guo@linaro.org> | 2012-05-19 15:34:58 +0200 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2012-05-19 20:17:35 +0200 |
| commit | 3e11f7b840b4671213c66817294ad7dd0b572756 (patch) | |
| tree | fc9246cd2e491e8c9b6f7cec994da2b314b7c4ca /drivers/gpio/gpio-generic.c | |
| parent | gpiolib: Remove 'const' from data argument of gpiochip_find() (diff) | |
| download | linux-3e11f7b840b4671213c66817294ad7dd0b572756.tar.xz linux-3e11f7b840b4671213c66817294ad7dd0b572756.zip | |
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.c | 16 |
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; |