[PATCH v1 1/1] Input: gpio-keys - expose wakeup keys in sysfs

[Guido Günther]

This helps user space to figure out which keys should be used to unidle a
device. E.g on phones the volume rocker should usually not unblank the
screen.

Signed-off-by: Guido Günther <a...@sigxcpu.org>
---
 drivers/input/keyboard/gpio_keys.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/drivers/input/keyboard/gpio_keys.c 
b/drivers/input/keyboard/gpio_keys.c
index 9f3bcd41cf67..84f43d1d4375 100644
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -198,7 +198,8 @@ static void gpio_keys_enable_button(struct gpio_button_data 
*bdata)
  */
 static ssize_t gpio_keys_attr_show_helper(struct gpio_keys_drvdata *ddata,
                                          char *buf, unsigned int type,
-                                         bool only_disabled)
+                                         bool only_disabled,
+                                         bool only_wakeup)
 {
        int n_events = get_n_events_by_type(type);
        unsigned long *bits;
@@ -218,6 +219,9 @@ static ssize_t gpio_keys_attr_show_helper(struct 
gpio_keys_drvdata *ddata,
                if (only_disabled && !bdata->disabled)
                        continue;
 
+               if (only_wakeup && !bdata->button->wakeup)
+                       continue;
+
                __set_bit(*bdata->code, bits);
        }
 
@@ -297,7 +301,7 @@ static ssize_t gpio_keys_attr_store_helper(struct 
gpio_keys_drvdata *ddata,
        return error;
 }
 
-#define ATTR_SHOW_FN(name, type, only_disabled)                                
\
+#define ATTR_SHOW_FN(name, type, only_disabled, only_wakeup)           \
 static ssize_t gpio_keys_show_##name(struct device *dev,               \
                                     struct device_attribute *attr,     \
                                     char *buf)                         \
@@ -306,22 +310,26 @@ static ssize_t gpio_keys_show_##name(struct device *dev,  
        \
        struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev);   \
                                                                        \
        return gpio_keys_attr_show_helper(ddata, buf,                   \
-                                         type, only_disabled);         \
+                                         type, only_disabled,          \
+                                         only_wakeup);                 \
 }
 
-ATTR_SHOW_FN(keys, EV_KEY, false);
-ATTR_SHOW_FN(switches, EV_SW, false);
-ATTR_SHOW_FN(disabled_keys, EV_KEY, true);
-ATTR_SHOW_FN(disabled_switches, EV_SW, true);
+ATTR_SHOW_FN(keys, EV_KEY, false, false);
+ATTR_SHOW_FN(switches, EV_SW, false, false);
+ATTR_SHOW_FN(disabled_keys, EV_KEY, true, false);
+ATTR_SHOW_FN(disabled_switches, EV_SW, true, false);
+ATTR_SHOW_FN(wakeup_keys, EV_KEY, false, true);
 
 /*
  * ATTRIBUTES:
  *
  * /sys/devices/platform/gpio-keys/keys [ro]
  * /sys/devices/platform/gpio-keys/switches [ro]
+ * /sys/devices/platform/gpio-keys/wakeup_keys [ro]
  */
 static DEVICE_ATTR(keys, S_IRUGO, gpio_keys_show_keys, NULL);
 static DEVICE_ATTR(switches, S_IRUGO, gpio_keys_show_switches, NULL);
+static DEVICE_ATTR(wakeup_keys, S_IRUGO, gpio_keys_show_wakeup_keys, NULL);
 
 #define ATTR_STORE_FN(name, type)                                      \
 static ssize_t gpio_keys_store_##name(struct device *dev,              \
@@ -361,6 +369,7 @@ static struct attribute *gpio_keys_attrs[] = {
        &dev_attr_switches.attr,
        &dev_attr_disabled_keys.attr,
        &dev_attr_disabled_switches.attr,
+       &dev_attr_wakeup_keys.attr,
        NULL,
 };
 ATTRIBUTE_GROUPS(gpio_keys);
-- 
2.43.0