diff options
| author | Mathias Kresin <dev@kresin.me> | 2018-06-28 21:57:40 +0200 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2018-07-02 16:00:49 +0200 |
| commit | 5b9b2b5284f81941972105b13337c58489ea8fca (patch) | |
| tree | ba66a03aaf0b22010e4f12ad29ea6a552c32b136 /drivers/gpio/gpio-stp-xway.c | |
| parent | bac5c3b829c3f2944d258dad1adec444b9deb338 (diff) | |
| download | linux-rt-5b9b2b5284f81941972105b13337c58489ea8fca.tar.gz | |
gpio: stp-xway: Implement get callback
Add an implementation to get the current GPIO state.
The callback is used by the leds-gpio driver for example, in case the
current LED/GPIO state should be kept during driver load.
Signed-off-by: Mathias Kresin <dev@kresin.me>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpio-stp-xway.c')
| -rw-r--r-- | drivers/gpio/gpio-stp-xway.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-stp-xway.c b/drivers/gpio/gpio-stp-xway.c index c07385b71403..63c708c3f3ae 100644 --- a/drivers/gpio/gpio-stp-xway.c +++ b/drivers/gpio/gpio-stp-xway.c @@ -91,6 +91,20 @@ struct xway_stp { }; /** + * xway_stp_get() - gpio_chip->get - get gpios. + * @gc: Pointer to gpio_chip device structure. + * @gpio: GPIO signal number. + * + * Gets the shadow value. + */ +static int xway_stp_get(struct gpio_chip *gc, unsigned int gpio) +{ + struct xway_stp *chip = gpiochip_get_data(gc); + + return (xway_stp_r32(chip->virt, XWAY_STP_CPU0) & BIT(gpio)); +} + +/** * xway_stp_set() - gpio_chip->set - set gpios. * @gc: Pointer to gpio_chip device structure. * @gpio: GPIO signal number. @@ -215,6 +229,7 @@ static int xway_stp_probe(struct platform_device *pdev) chip->gc.parent = &pdev->dev; chip->gc.label = "stp-xway"; chip->gc.direction_output = xway_stp_dir_out; + chip->gc.get = xway_stp_get; chip->gc.set = xway_stp_set; chip->gc.request = xway_stp_request; chip->gc.base = -1; |