This patch adds support for /sys/class/rc/rc?/wakeup_scancodes file
which can be used to read/write new wakeup scancodes to/from hardware.
The contents of the scancode file are simply white space separated
bytes.
How to read:
cat /sys/class/rc/rc?/wakeup_scancodes
How to write:
echo "0x1 0x2 0x3" > /sys/class/rc/rc?/wakeup_scancodes
Signed-off-by: Antti Seppälä <a.seppala@xxxxxxxxx>
---
drivers/media/rc/rc-main.c | 129 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 129 insertions(+)
diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c
index 02e2f38..a2a68f3 100644
--- a/drivers/media/rc/rc-main.c
+++ b/drivers/media/rc/rc-main.c
@@ -967,6 +967,119 @@ out:
return ret;
}
+/**
+ * show_wakeup_scancodes() - shows the current IR wake scancode(s)
+ * @device: the device descriptor
+ * @mattr: the device attribute struct (unused)
+ * @buf: a pointer to the output buffer
+ *
+ * This routine is a callback routine for input read the IR wake scancode(s).
+ * it is trigged by reading /sys/class/rc/rc?/wakeup_scancodes.
+ * It returns the currently active IR wake scancode or empty buffer if wake
+ * scancode is not active.
+ *
+ * dev->lock is taken to guard against races between device
+ * registration, store_wakeup_scancodes and show_wakeup_scancodes.
+ */
+static ssize_t show_wakeup_scancodes(struct device *device,
+ struct device_attribute *mattr, char *buf)
+{
+ int ret, pos = 0;
+ struct rc_wakeup_scancode *scancode, *next;
+ LIST_HEAD(scancode_list);
+ struct rc_dev *dev = to_rc_dev(device);
+
+ if (!dev || !dev->s_wakeup_scancodes)
+ return -ENODEV;
+
+ mutex_lock(&dev->lock);
+
+ ret = dev->s_wakeup_scancodes(dev, &scancode_list, 0);
+
+ list_for_each_entry_safe_reverse(scancode, next, &scancode_list,
+ list_item) {
+ pos += scnprintf(buf + pos, PAGE_SIZE - pos, "0x%x ",
+ scancode->value);
+ list_del(&scancode->list_item);
+ kfree(scancode);
+ }
+ pos += scnprintf(buf + pos, PAGE_SIZE - pos, "\n");
+
+ mutex_unlock(&dev->lock);
+
+ if (ret < 0)
+ return ret;
+
+ return pos;
+}
+
+/**
+ * store_wakeup_scancodes() - changes the current IR wake scancode(s)
+ * @device: the device descriptor
+ * @mattr: the device attribute struct (unused)
+ * @buf: a pointer to the input buffer
+ * @len: length of the input buffer
+ *
+ * This routine is for changing the IR wake scancode.
+ * It is trigged by writing to /sys/class/rc/rc?/wakeup_scancodes.
+ * Writing bytes separated by white space will pass them to the hardware.
+ * Writing "" (empty) will clear active wake scancode.
+ * Returns -EINVAL if too many values or invalid values were used
+ * otherwise @len.
+ *
+ * dev->lock is taken to guard against races between device
+ * registration, store_wakeup_scancodes and show_wakeup_scancodes.
+ */
+static ssize_t store_wakeup_scancodes(struct device *device,
+ struct device_attribute *mattr,
+ const char *data,
+ size_t len)
+{
+ int ret = 0, error = 0;
+ char *tmp;
+ u8 value;
+ struct rc_wakeup_scancode *scancode, *next;
+ LIST_HEAD(scancode_list);
+ struct rc_dev *dev = to_rc_dev(device);
+
+ if (!dev || !dev->s_wakeup_scancodes)
+ return -ENODEV;
+
+ mutex_lock(&dev->lock);
+
+ while ((tmp = strsep((char **) &data, " ,\t\n")) != NULL) {
+ if (!*tmp)
+ break;
+
+ if (sscanf(tmp, "0x%2hhx", &value) != 1 &&
+ sscanf(tmp, "%2hhx", &value) != 1) {
+ error = 1;
+ break;
+ } else {
+ scancode = kmalloc(sizeof(struct rc_wakeup_scancode),
+ GFP_KERNEL);
+ scancode->value = value;
+ list_add(&scancode->list_item, &scancode_list);
+ }
+ }
+
+ if (error)
+ IR_dprintk(1, "Error parsing value of %s", tmp);
+ else
+ ret = dev->s_wakeup_scancodes(dev, &scancode_list, 1);
+
+ list_for_each_entry_safe(scancode, next, &scancode_list, list_item) {
+ list_del(&scancode->list_item);
+ kfree(scancode);
+ }
+
+ mutex_unlock(&dev->lock);
+ if (ret < 0)
+ return ret;
+
+ return error ? -EINVAL : len;
+}
+
static void rc_dev_release(struct device *device)
{
}
@@ -1019,6 +1132,15 @@ static struct device_type rc_dev_type = {
.uevent = rc_dev_uevent,
};
+static struct device_attribute dev_attr_wakeup_scancodes = {
+ .attr = {
+ .name = "wakeup_scancodes",
+ .mode = S_IRUGO | S_IWUSR,
+ },
+ .show = show_wakeup_scancodes,
+ .store = store_wakeup_scancodes,
+};
+
struct rc_dev *rc_allocate_device(void)
{
struct rc_dev *dev;
@@ -1175,6 +1297,13 @@ int rc_register_device(struct rc_dev *dev)
dev->enabled_protocols = rc_type;
}
+ /* Create sysfs entry only if device has wake scancode support */
+ if (dev->s_wakeup_scancodes) {
+ rc = device_create_file(&dev->dev, &dev_attr_wakeup_scancodes);
+ if (rc < 0)
+ goto out_raw;
+ }
+
mutex_unlock(&dev->lock);
IR_dprintk(1, "Registered rc%ld (driver: %s, remote: %s, mode %s)\n",
--
1.8.3.2
--
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