[RFC PATCH V4 3/6] Configfs support for IR

[Jon Smirl]

Now uses configfs to build mappings from remote buttons to key strokes. When ir-core loads it creates /config/remotes. Make a directory for each remote you have; this will cause a new input devices to be created. Inside these directories make a directory for each key on the remote. In the key directory attributes fill in the protocol, device, command, keycode. Since this is configfs all of this can be easily scripted.

Now when a key is pressed on a remote, the configfs directories are searched for a match on protocol, device, command. If a matches is found, a key stroke corresponding to keycode is created and sent on the input device that was created when the directory for the remote was made.

The configfs directories are pretty flexible. You can use them to map multiple remotes to the same key stroke, or send a single button push to multiple apps.
---
 drivers/input/ir/Makefile      |    2 
 drivers/input/ir/ir-configfs.c |  333 ++++++++++++++++++++++++++++++++++++++++
 drivers/input/ir/ir-core.c     |   15 +-
 3 files changed, 339 insertions(+), 11 deletions(-)
 create mode 100644 drivers/input/ir/ir-configfs.c

diff --git a/drivers/input/ir/Makefile b/drivers/input/ir/Makefile
index 6acb665..2ccdda3 100644
--- a/drivers/input/ir/Makefile
+++ b/drivers/input/ir/Makefile
@@ -4,5 +4,5 @@
 # Each configuration option enables a list of files.
 
 obj-$(CONFIG_INPUT_IR)		+= ir.o
-ir-objs := ir-core.o
+ir-objs := ir-core.o ir-configfs.o
 
diff --git a/drivers/input/ir/ir-configfs.c b/drivers/input/ir/ir-configfs.c
new file mode 100644
index 0000000..0fec855
--- /dev/null
+++ b/drivers/input/ir/ir-configfs.c
@@ -0,0 +1,333 @@
+/*
+ * Configfs routines for IR support
+ *
+ *   configfs root
+ *   --remotes
+ *   ----specific remote
+ *   ------keymap
+ *   --------protocol
+ *   --------device
+ *   --------command
+ *   --------keycode
+ *   ------repeat keymaps
+ *   --------....
+ *   ----another remote
+ *   ------more keymaps
+ *   --------....
+ *
+ * Copyright (C) 2008 Jon Smirl <jonsmirl@xxxxxxxxx>
+ */
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/input.h>
+
+#include "ir.h"
+
+static void remote_release(struct config_item *remote);
+
+struct keymap {
+	struct config_item item;
+	int protocol;
+	int device;
+	int command;
+	int keycode;
+};
+
+static inline struct keymap *to_keymap(struct config_item *item)
+{
+	return item ? container_of(item, struct keymap, item) : NULL;
+}
+
+struct remote {
+	struct config_group group;
+	struct input_dev *input;
+};
+
+static inline struct remote *to_remote(struct config_group *group)
+{
+	return group ? container_of(group, struct remote, group) : NULL;
+}
+
+
+static struct configfs_attribute item_protocol = {
+	.ca_owner = THIS_MODULE,
+	.ca_name = "protocol",
+	.ca_mode = S_IRUGO | S_IWUSR,
+};
+
+static struct configfs_attribute item_device = {
+	.ca_owner = THIS_MODULE,
+	.ca_name = "device",
+	.ca_mode = S_IRUGO | S_IWUSR,
+};
+
+static struct configfs_attribute item_command = {
+	.ca_owner = THIS_MODULE,
+	.ca_name = "command",
+	.ca_mode = S_IRUGO | S_IWUSR,
+};
+
+static struct configfs_attribute item_keycode = {
+	.ca_owner = THIS_MODULE,
+	.ca_name = "keycode",
+	.ca_mode = S_IRUGO | S_IWUSR,
+};
+
+static ssize_t item_show(struct config_item *item,
+				      struct configfs_attribute *attr,
+				      char *page)
+{
+	struct keymap *keymap = to_keymap(item);
+
+	if (attr == &item_protocol)
+		return sprintf(page, "%d\n", keymap->protocol);
+	if (attr == &item_device)
+		return sprintf(page, "%d\n", keymap->device);
+	if (attr == &item_command)
+		return sprintf(page, "%d\n", keymap->command);
+	return sprintf(page, "%d\n", keymap->keycode);
+}
+
+static ssize_t item_store(struct config_item *item,
+				       struct configfs_attribute *attr,
+				       const char *page, size_t count)
+{
+	struct keymap *keymap = to_keymap(item);
+	struct remote *remote;
+	unsigned long tmp;
+	char *p = (char *) page;
+
+	tmp = simple_strtoul(p, &p, 10);
+	if (!p || (*p && (*p != '\n')))
+		return -EINVAL;
+
+	if (tmp > INT_MAX)
+		return -ERANGE;
+
+	if (attr == &item_protocol)
+		keymap->protocol = tmp;
+	else if (attr == &item_device)
+		keymap->device = tmp;
+	else if (attr == &item_command)
+		keymap->command = tmp;
+	else {
+		if (tmp < KEY_MAX) {
+			remote = to_remote(to_config_group(item->ci_parent));
+			set_bit(tmp, remote->input->keybit);
+			keymap->keycode = tmp;
+		}
+	}
+	return count;
+}
+
+static void keymap_release(struct config_item *item)
+{
+	struct keymap *keymap = to_keymap(item);
+	struct remote *remote = to_remote(to_config_group(item->ci_parent));
+
+	printk("keymap release\n");
+	clear_bit(keymap->keycode, remote->input->keybit);
+	kfree(keymap);
+}
+
+static struct configfs_item_operations keymap_ops = {
+	.release = keymap_release,
+	.show_attribute = item_show,
+	.store_attribute = item_store,
+};
+
+/* Start the definition of the all of the attributes
+ * in a single keymap directory
+ */
+static struct configfs_attribute *keymap_attrs[] = {
+	&item_protocol,
+	&item_device,
+	&item_command,
+	&item_keycode,
+	NULL,
+};
+
+static struct config_item_type keymap_type = {
+	.ct_item_ops = &keymap_ops,
+	.ct_attrs	= keymap_attrs,
+	.ct_owner	= THIS_MODULE,
+};
+
+static struct config_item *make_keymap(struct config_group *group, const char *name)
+{
+	struct keymap *keymap;
+
+	keymap = kzalloc(sizeof(*keymap), GFP_KERNEL);
+	if (!keymap)
+		return ERR_PTR(-ENOMEM);
+
+	config_item_init_type_name(&keymap->item, name, &keymap_type);
+	return &keymap->item;
+}
+
+/*
+ * Note that, since no extra work is required on ->drop_item(),
+ * no ->drop_item() is provided.
+ */
+static struct configfs_group_operations remote_group_ops = {
+	.make_item = make_keymap,
+};
+
+static ssize_t remote_show_description(struct config_item *item,
+					 struct configfs_attribute *attr,
+					 char *page)
+{
+	return sprintf(page,
+"Map for a specific remote\n"
+"Remote signals matching this map will be translated into keyboard/mouse events\n");
+}
+
+static struct configfs_item_operations remote_item_ops = {
+	.release	= remote_release,
+	.show_attribute	= remote_show_description,
+};
+
+static struct configfs_attribute remote_attr_description = {
+	.ca_owner = THIS_MODULE,
+	.ca_name = "description",
+	.ca_mode = S_IRUGO,
+};
+
+static struct configfs_attribute *remote_attrs[] = {
+	&remote_attr_description,
+	NULL,
+};
+
+static struct config_item_type remote_type = {
+	.ct_item_ops	= &remote_item_ops,
+	.ct_group_ops	= &remote_group_ops,
+	.ct_attrs	= remote_attrs,
+	.ct_owner	= THIS_MODULE,
+};
+
+/* Top level remotes directory for all remotes */
+
+/* Create a new remote group */
+static struct config_group *make_remote(struct config_group *parent, const char *name)
+{
+	struct remote *remote;
+	int ret;
+
+	remote = kzalloc(sizeof(*remote), GFP_KERNEL);
+	if (!remote)
+		return ERR_PTR(-ENOMEM);
+
+	remote->input = input_allocate_device();
+	if (!remote->input) {
+		ret = -ENOMEM;
+		goto free_mem;
+	}
+	remote->input->id.bustype = BUS_VIRTUAL;
+	remote->input->name = name;
+	remote->input->phys = "remotes";
+
+	remote->input->evbit[0] = BIT_MASK(EV_KEY);
+
+	ret = input_register_device(remote->input);
+	if (ret)
+		goto free_input;
+
+	config_group_init_type_name(&remote->group, name, &remote_type);
+	return &remote->group;
+
+ free_input:
+	input_free_device(remote->input);
+ free_mem:
+	kfree(remote);
+	return ERR_PTR(ret);
+}
+
+static void remote_release(struct config_item *item)
+{
+	struct config_group *group = to_config_group(item);
+	struct remote *remote  = to_remote(group);
+
+	input_free_device(remote->input);
+	kfree(remote);
+}
+
+static ssize_t remotes_show_description(struct config_item *item,
+					struct configfs_attribute *attr,
+					char *page)
+{
+	return sprintf(page,
+"This subsystem allows the creation of IR remote control maps.\n"
+"Maps allow IR signals to be mapped into key strokes or mouse events.\n");
+}
+
+static struct configfs_item_operations remotes_item_ops = {
+	.show_attribute	= remotes_show_description,
+	.release = remote_release,
+};
+
+static struct configfs_attribute remotes_attr_description = {
+	.ca_owner = THIS_MODULE,
+	.ca_name = "description",
+	.ca_mode = S_IRUGO,
+};
+
+static struct configfs_attribute *remotes_attrs[] = {
+	&remotes_attr_description,
+	NULL,
+};
+
+/*
+ * Note that, since no extra work is required on ->drop_item(),
+ * no ->drop_item() is provided.
+ */
+static struct configfs_group_operations remotes_group_ops = {
+	.make_group	= make_remote,
+};
+
+static struct config_item_type remotes_type = {
+	.ct_item_ops	= &remotes_item_ops,
+	.ct_group_ops	= &remotes_group_ops,
+	.ct_attrs	= remotes_attrs,
+	.ct_owner	= THIS_MODULE,
+};
+
+struct configfs_subsystem input_ir_remotes = {
+	.su_group = {
+		.cg_item = {
+			.ci_namebuf = "remotes",
+			.ci_type = &remotes_type,
+		},
+	},
+};
+
+void input_ir_translate(struct input_dev *dev, int protocol, int device, int command)
+{
+	struct config_item *i, *j;
+	struct config_group *g;
+	struct remote *remote;
+	struct keymap *keymap;
+
+	/* generate the IR format event */
+	input_report_ir(dev, IR_PROTOCOL, protocol);
+	input_report_ir(dev, IR_DEVICE, device);
+	input_report_ir(dev, IR_COMMAND, command);
+	input_sync(dev);
+
+    mutex_lock(&input_ir_remotes.su_mutex);
+
+    /* search the translation maps to translate into key stroke */
+    list_for_each_entry(i, &input_ir_remotes.su_group.cg_children, ci_entry) {
+    	g = to_config_group(i);
+        list_for_each_entry(j, &g->cg_children, ci_entry) {
+        	keymap = to_keymap(j);
+        	if ((keymap->protocol == protocol) && (keymap->device == device)
+        			&& (keymap->command == command)) {
+				remote = to_remote(g);
+				input_report_key(remote->input, keymap->keycode, 1);
+				input_sync(remote->input);
+        	}
+        }
+    }
+    mutex_unlock(&input_ir_remotes.su_mutex);
+}
diff --git a/drivers/input/ir/ir-core.c b/drivers/input/ir/ir-core.c
index 3a309fa..8e08f3f 100644
--- a/drivers/input/ir/ir-core.c
+++ b/drivers/input/ir/ir-core.c
@@ -10,15 +10,6 @@
 
 #include "ir.h"
 
-void input_ir_translate(struct input_dev *dev, int protocol, int device, int command)
-{
-	/* generate the IR format event */
-	input_report_ir(dev, IR_PROTOCOL, protocol);
-	input_report_ir(dev, IR_DEVICE, device);
-	input_report_ir(dev, IR_COMMAND, command);
-	input_sync(dev);
-}
-
 static int encode_sony(struct ir_device *ir, struct ir_command *command)
 {
 	/* Sony SIRC IR code */
@@ -673,11 +664,15 @@ EXPORT_SYMBOL_GPL(input_ir_destroy);
 
 static int __init input_ir_init(void)
 {
-	return 0;
+	config_group_init(&input_ir_remotes.su_group);
+	mutex_init(&input_ir_remotes.su_mutex);
+
+	return configfs_register_subsystem(&input_ir_remotes);
 }
 module_init(input_ir_init);
 
 static void __exit input_ir_exit(void)
 {
+	configfs_unregister_subsystem(&input_ir_remotes);
 }
 module_exit(input_ir_exit);

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