[PATCH 17/22] gpiolib: cdev: report edge detection in lineinfo

[Kent Gibson]

Report the state of edge detection for a line in the gpioline_info_v2
returned by GPIO_GET_LINEINFO_V2_IOCTL, and indirectly for lines watched
by GPIO_GET_LINEINFO_WATCH_V2_IOCTL.

Signed-off-by: Kent Gibson <warthog...@gmail.com>

---
 drivers/gpio/gpiolib-cdev.c | 14 ++++++++++++++
 drivers/gpio/gpiolib.c      |  2 ++
 drivers/gpio/gpiolib.h      |  2 ++
 3 files changed, 18 insertions(+)

diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c
index d4a22d78953f..7ba0929b2741 100644
--- a/drivers/gpio/gpiolib-cdev.c
+++ b/drivers/gpio/gpiolib-cdev.c
@@ -566,6 +566,12 @@ static void edge_detector_stop(struct edge_detector *edet)
 static int edge_detector_setup(struct edge_detector *edet,
                               struct gpioline_config *lc)
 {
+       struct gpio_desc *desc = edge_detector_desc(edet);
+
+       if (lc->edge_detection & GPIOLINE_EDGE_RISING)
+               set_bit(FLAG_EDGE_RISING, &desc->flags);
+       if (lc->edge_detection & GPIOLINE_EDGE_FALLING)
+               set_bit(FLAG_EDGE_FALLING, &desc->flags);
        if (lc->edge_detection)
                return edge_detector_start(edet);
        return 0;
@@ -1574,6 +1580,14 @@ static void gpio_desc_to_lineinfo(struct gpio_desc *desc,
        }
 
        lc->edge_detection = 0;
+       if (test_bit(FLAG_EDGE_RISING, &desc->flags)) {
+               lc->flags |= GPIOLINE_FLAG_V2_EDGE_DETECTION;
+               lc->edge_detection |= GPIOLINE_EDGE_RISING;
+       }
+       if (test_bit(FLAG_EDGE_FALLING, &desc->flags)) {
+               lc->flags |= GPIOLINE_FLAG_V2_EDGE_DETECTION;
+               lc->edge_detection |= GPIOLINE_EDGE_FALLING;
+       }
 
        spin_unlock_irqrestore(&gpio_lock, flags);
 }
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 517c99ddf6c8..a5f2795e17b7 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2041,6 +2041,8 @@ static bool gpiod_free_commit(struct gpio_desc *desc)
                clear_bit(FLAG_PULL_UP, &desc->flags);
                clear_bit(FLAG_PULL_DOWN, &desc->flags);
                clear_bit(FLAG_BIAS_DISABLE, &desc->flags);
+               clear_bit(FLAG_EDGE_RISING, &desc->flags);
+               clear_bit(FLAG_EDGE_FALLING, &desc->flags);
                clear_bit(FLAG_IS_HOGGED, &desc->flags);
 #ifdef CONFIG_OF_DYNAMIC
                desc->hog = NULL;
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index 2dee4e1e12dc..1dc6d2b191af 100644
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -114,6 +114,8 @@ struct gpio_desc {
 #define FLAG_PULL_UP    13     /* GPIO has pull up enabled */
 #define FLAG_PULL_DOWN  14     /* GPIO has pull down enabled */
 #define FLAG_BIAS_DISABLE    15        /* GPIO has pull disabled */
+#define FLAG_EDGE_RISING     16        /* GPIO CDEV detects rising edge events 
*/
+#define FLAG_EDGE_FALLING    17        /* GPIO CDEV detects falling edge 
events */
 
        /* Connection label */
        const char              *label;
-- 
2.27.0