From 5b9b2b5284f81941972105b13337c58489ea8fca Mon Sep 17 00:00:00 2001
From: Mathias Kresin <dev@kresin.me>
Date: Thu, 28 Jun 2018 21:57:40 +0200
Subject: [PATCH] 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>
---
drivers/gpio/gpio-stp-xway.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
--- 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 platfor
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;
