diff mbox

[1/2] gpio: htc-egpio: add .get_direction() support

Message ID 1480496955-5727-1-git-send-email-linus.walleij@linaro.org
State Accepted
Commit 9298539c0472c1bd7516c62d444e561493e3f26c
Headers show

Commit Message

Linus Walleij Nov. 30, 2016, 9:09 a.m. UTC 
This makes is possible to read out the current direction of a
GPIO line on the HTC CPLD GPIO expander.

Suggested-by: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

---
 drivers/gpio/gpio-htc-egpio.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

-- 
2.7.4

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diff mbox

Patch

diff --git a/drivers/gpio/gpio-htc-egpio.c b/drivers/gpio/gpio-htc-egpio.c
index 5ab895b41819..27af52850927 100644
--- a/drivers/gpio/gpio-htc-egpio.c
+++ b/drivers/gpio/gpio-htc-egpio.c
@@ -225,6 +225,15 @@  static int egpio_direction_output(struct gpio_chip *chip,
 	}
 }
 
+static int egpio_get_direction(struct gpio_chip *chip, unsigned offset)
+{
+	struct egpio_chip *egpio;
+
+	egpio = gpiochip_get_data(chip);
+
+	return !test_bit(offset, &egpio->is_out);
+}
+
 static void egpio_write_cache(struct egpio_info *ei)
 {
 	int               i;
@@ -327,6 +336,7 @@  static int __init egpio_probe(struct platform_device *pdev)
 		chip->set             = egpio_set;
 		chip->direction_input = egpio_direction_input;
 		chip->direction_output = egpio_direction_output;
+		chip->get_direction   = egpio_get_direction;
 		chip->base            = pdata->chip[i].gpio_base;
 		chip->ngpio           = pdata->chip[i].num_gpios;