diff options
| author | Hans de Goede <hdegoede@redhat.com> | 2018-12-31 23:55:21 +0300 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2019-01-10 18:22:37 +0300 |
| commit | 72893f0c6bd399ce84e3c1c9fc69d234fe37d098 (patch) | |
| tree | 952cdaaae1212b03a13648d29533455f379bdb29 /drivers | |
| parent | e8dacf5957ea583c2a1f48600043a6f76e340d1e (diff) | |
| download | linux-72893f0c6bd399ce84e3c1c9fc69d234fe37d098.tar.xz | |
gpiolib-acpi: Preserve non direction flags when updating gpiod_flags
__acpi_gpio_update_gpiod_flags purpose is to make the gpiod_flags used
when requesting a GPIO match the restrictions from the ACPI resource,
as stored in acpi_gpio_info.flags.
But acpi_gpio_info.flags only contains direction info, and the
requester may have passed in special non-direction flags like
GPIOD_FLAGS_BIT_NONEXCLUSIVE, which we currently clobber.
This commit modifies __acpi_gpio_update_gpiod_flags to preserve these
special flags, so that a requested of an ACPI GPIO can e.g. pass
GPIOD_FLAGS_BIT_NONEXCLUSIV and have it work as intended.
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpio/gpiolib-acpi.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c index 48534bda73d3..f0763e0e02f1 100644 --- a/drivers/gpio/gpiolib-acpi.c +++ b/drivers/gpio/gpiolib-acpi.c @@ -474,6 +474,9 @@ acpi_gpio_to_gpiod_flags(const struct acpi_resource_gpio *agpio) static int __acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update) { + const enum gpiod_flags mask = + GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT | + GPIOD_FLAGS_BIT_DIR_VAL; int ret = 0; /* @@ -494,7 +497,7 @@ __acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update) if (((*flags & GPIOD_FLAGS_BIT_DIR_SET) && (diff & GPIOD_FLAGS_BIT_DIR_OUT)) || ((*flags & GPIOD_FLAGS_BIT_DIR_OUT) && (diff & GPIOD_FLAGS_BIT_DIR_VAL))) ret = -EINVAL; - *flags = update; + *flags = (*flags & ~mask) | (update & mask); } return ret; } |