V4L/DVB: ir-core: Add support for disabling all protocols

Writing "none" to /dev/class/rc/rc*/protocols will disable all protocols.
This allows an easier setup, from userspace, as userspace applications don't
need to disable protocol per protocol, before enabling a different set of
protocols.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 18 insertions, 9 deletions

diff --git a/drivers/media/IR/ir-sysfs.c b/drivers/media/IR/ir-sysfs.c
index c0c4dc250599..e84f9783b8c2 100644
--- a/drivers/media/IR/ir-sysfs.c
+++ b/drivers/media/IR/ir-sysfs.c
@@ -45,6 +45,8 @@ static struct {
         { IR_TYPE_SONY,         "sony"          },
 };
 
+#define PROTO_NONE      "none"
+
 /**
  * show_protocols() - shows the current IR protocol(s)
  * @d:          the device descriptor
@@ -101,6 +103,7 @@ static ssize_t show_protocols(struct device *d,
  * Writing "+proto" will add a protocol to the list of enabled protocols.
  * Writing "-proto" will remove a protocol from the list of enabled protocols.
  * Writing "proto" will enable only "proto".
+ * Writing "none" will disable all protocols.
  * Returns -EINVAL if an invalid protocol combination or unknown protocol name
  * is used, otherwise @len.
  */
@@ -134,16 +137,22 @@ static ssize_t store_protocols(struct device *d,
                 disable = false;
         }
 
-        for (i = 0; i < ARRAY_SIZE(proto_names); i++) {
-                if (!strncasecmp(tmp, proto_names[i].name, strlen(proto_names[i].name))) {
-                        tmp += strlen(proto_names[i].name);
-                        mask = proto_names[i].type;
-                        break;
+
+        if (!enable && !disable && !strncasecmp(tmp, PROTO_NONE, sizeof(PROTO_NONE))) {
+                mask = 0;
+                tmp += sizeof(PROTO_NONE);
+        } else {
+                for (i = 0; i < ARRAY_SIZE(proto_names); i++) {
+                        if (!strncasecmp(tmp, proto_names[i].name, strlen(proto_names[i].name))) {
+                                tmp += strlen(proto_names[i].name);
+                                mask = proto_names[i].type;
+                                break;
+                        }
+                }
+                if (i == ARRAY_SIZE(proto_names)) {
+                        IR_dprintk(1, "Unknown protocol\n");
+                        return -EINVAL;
                 }
-        }
-        if (i == ARRAY_SIZE(proto_names)) {
-                IR_dprintk(1, "Unknown protocol\n");
-                return -EINVAL;
         }
 
         tmp = skip_spaces(tmp);