1 files changed, 303 insertions, 0 deletions
diff --git a/drivers/media/IR/ir-sysfs.c b/drivers/media/IR/ir-sysfs.c
new file mode 100644
index 000000000000..2098dd1488e0
--- /dev/null
+++ b/drivers/media/IR/ir-sysfs.c
@@ -0,0 +1,303 @@
+/* ir-sysfs.c - sysfs interface for RC devices (/sys/class/rc)
+ *
+ * Copyright (C) 2009-2010 by Mauro Carvalho Chehab <mchehab@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation version 2 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ */
+
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/device.h>
+#include "ir-core-priv.h"
+
+#define IRRCV_NUM_DEVICES	256
+
+/* bit array to represent IR sysfs device number */
+static unsigned long ir_core_dev_number;
+
+/* class for /sys/class/rc */
+static char *ir_devnode(struct device *dev, mode_t *mode)
+{
+	return kasprintf(GFP_KERNEL, "rc/%s", dev_name(dev));
+}
+
+static struct class ir_input_class = {
+	.name		= "rc",
+	.devnode	= ir_devnode,
+};
+
+/**
+ * show_protocol() - shows the current IR protocol
+ * @d:		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 protocol type.
+ * it is trigged by reading /sys/class/rc/rc?/current_protocol.
+ * It returns the protocol name, as understood by the driver.
+ */
+static ssize_t show_protocol(struct device *d,
+			     struct device_attribute *mattr, char *buf)
+{
+	char *s;
+	struct ir_input_dev *ir_dev = dev_get_drvdata(d);
+	u64 ir_type = ir_dev->rc_tab.ir_type;
+
+	IR_dprintk(1, "Current protocol is %lld\n", (long long)ir_type);
+
+	/* FIXME: doesn't support multiple protocols at the same time */
+	if (ir_type == IR_TYPE_UNKNOWN)
+		s = "Unknown";
+	else if (ir_type == IR_TYPE_RC5)
+		s = "rc-5";
+	else if (ir_type == IR_TYPE_NEC)
+		s = "nec";
+	else if (ir_type == IR_TYPE_RC6)
+		s = "rc6";
+	else if (ir_type == IR_TYPE_JVC)
+		s = "jvc";
+	else if (ir_type == IR_TYPE_SONY)
+		s = "sony";
+	else
+		s = "other";
+
+	return sprintf(buf, "%s\n", s);
+}
+
+/**
+ * store_protocol() - shows the current IR protocol
+ * @d:		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 a callback routine for changing the IR protocol type.
+ * it is trigged by reading /sys/class/rc/rc?/current_protocol.
+ * It changes the IR the protocol name, if the IR type is recognized
+ * by the driver.
+ * If an unknown protocol name is used, returns -EINVAL.
+ */
+static ssize_t store_protocol(struct device *d,
+			      struct device_attribute *mattr,
+			      const char *data,
+			      size_t len)
+{
+	struct ir_input_dev *ir_dev = dev_get_drvdata(d);
+	u64 ir_type = 0;
+	int rc = -EINVAL;
+	unsigned long flags;
+	char *buf;
+
+	while ((buf = strsep((char **) &data, " \n")) != NULL) {
+		if (!strcasecmp(buf, "rc-5") || !strcasecmp(buf, "rc5"))
+			ir_type |= IR_TYPE_RC5;
+		if (!strcasecmp(buf, "nec"))
+			ir_type |= IR_TYPE_NEC;
+		if (!strcasecmp(buf, "jvc"))
+			ir_type |= IR_TYPE_JVC;
+		if (!strcasecmp(buf, "sony"))
+			ir_type |= IR_TYPE_SONY;
+	}
+
+	if (!ir_type) {
+		IR_dprintk(1, "Unknown protocol\n");
+		return -EINVAL;
+	}
+
+	if (ir_dev->props && ir_dev->props->change_protocol)
+		rc = ir_dev->props->change_protocol(ir_dev->props->priv,
+						    ir_type);
+
+	if (rc < 0) {
+		IR_dprintk(1, "Error setting protocol to %lld\n",
+			   (long long)ir_type);
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&ir_dev->rc_tab.lock, flags);
+	ir_dev->rc_tab.ir_type = ir_type;
+	spin_unlock_irqrestore(&ir_dev->rc_tab.lock, flags);
+
+	IR_dprintk(1, "Current protocol(s) is(are) %lld\n",
+		   (long long)ir_type);
+
+	return len;
+}
+
+static ssize_t show_supported_protocols(struct device *d,
+			     struct device_attribute *mattr, char *buf)
+{
+	char *orgbuf = buf;
+	struct ir_input_dev *ir_dev = dev_get_drvdata(d);
+
+	/* FIXME: doesn't support multiple protocols at the same time */
+	if (ir_dev->props->allowed_protos == IR_TYPE_UNKNOWN)
+		buf += sprintf(buf, "unknown ");
+	if (ir_dev->props->allowed_protos & IR_TYPE_RC5)
+		buf += sprintf(buf, "rc-5 ");
+	if (ir_dev->props->allowed_protos & IR_TYPE_NEC)
+		buf += sprintf(buf, "nec ");
+	if (buf == orgbuf)
+		buf += sprintf(buf, "other ");
+
+	buf += sprintf(buf - 1, "\n");
+
+	return buf - orgbuf;
+}
+
+#define ADD_HOTPLUG_VAR(fmt, val...)					\
+	do {								\
+		int err = add_uevent_var(env, fmt, val);		\
+		if (err)						\
+			return err;					\
+	} while (0)
+
+static int ir_dev_uevent(struct device *device, struct kobj_uevent_env *env)
+{
+	struct ir_input_dev *ir_dev = dev_get_drvdata(device);
+
+	if (ir_dev->rc_tab.name)
+		ADD_HOTPLUG_VAR("NAME=%s", ir_dev->rc_tab.name);
+	if (ir_dev->driver_name)
+		ADD_HOTPLUG_VAR("DRV_NAME=%s", ir_dev->driver_name);
+
+	return 0;
+}
+
+/*
+ * Static device attribute struct with the sysfs attributes for IR's
+ */
+static DEVICE_ATTR(protocol, S_IRUGO | S_IWUSR,
+		   show_protocol, store_protocol);
+
+static DEVICE_ATTR(supported_protocols, S_IRUGO | S_IWUSR,
+		   show_supported_protocols, NULL);
+
+static struct attribute *ir_hw_dev_attrs[] = {
+	&dev_attr_protocol.attr,
+	&dev_attr_supported_protocols.attr,
+	NULL,
+};
+
+static struct attribute_group ir_hw_dev_attr_grp = {
+	.attrs	= ir_hw_dev_attrs,
+};
+
+static const struct attribute_group *ir_hw_dev_attr_groups[] = {
+	&ir_hw_dev_attr_grp,
+	NULL
+};
+
+static struct device_type rc_dev_type = {
+	.groups		= ir_hw_dev_attr_groups,
+	.uevent		= ir_dev_uevent,
+};
+
+static struct device_type ir_raw_dev_type = {
+	.uevent		= ir_dev_uevent,
+};
+
+/**
+ * ir_register_class() - creates the sysfs for /sys/class/rc/rc?
+ * @input_dev:	the struct input_dev descriptor of the device
+ *
+ * This routine is used to register the syfs code for IR class
+ */
+int ir_register_class(struct input_dev *input_dev)
+{
+	int rc;
+	const char *path;
+	struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
+	int devno = find_first_zero_bit(&ir_core_dev_number,
+					IRRCV_NUM_DEVICES);
+
+	if (unlikely(devno < 0))
+		return devno;
+
+	if (ir_dev->props) {
+		if (ir_dev->props->driver_type == RC_DRIVER_SCANCODE)
+			ir_dev->dev.type = &rc_dev_type;
+	} else
+		ir_dev->dev.type = &ir_raw_dev_type;
+
+	ir_dev->dev.class = &ir_input_class;
+	ir_dev->dev.parent = input_dev->dev.parent;
+	dev_set_name(&ir_dev->dev, "rc%d", devno);
+	dev_set_drvdata(&ir_dev->dev, ir_dev);
+	rc = device_register(&ir_dev->dev);
+	if (rc)
+		return rc;
+
+
+	input_dev->dev.parent = &ir_dev->dev;
+	rc = input_register_device(input_dev);
+	if (rc < 0) {
+		device_del(&ir_dev->dev);
+		return rc;
+	}
+
+	__module_get(THIS_MODULE);
+
+	path = kobject_get_path(&ir_dev->dev.kobj, GFP_KERNEL);
+	printk(KERN_INFO "%s: %s as %s\n",
+		dev_name(&ir_dev->dev),
+		input_dev->name ? input_dev->name : "Unspecified device",
+		path ? path : "N/A");
+	kfree(path);
+
+	ir_dev->devno = devno;
+	set_bit(devno, &ir_core_dev_number);
+
+	return 0;
+};
+
+/**
+ * ir_unregister_class() - removes the sysfs for sysfs for
+ *			   /sys/class/rc/rc?
+ * @input_dev:	the struct input_dev descriptor of the device
+ *
+ * This routine is used to unregister the syfs code for IR class
+ */
+void ir_unregister_class(struct input_dev *input_dev)
+{
+	struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
+
+	clear_bit(ir_dev->devno, &ir_core_dev_number);
+	input_unregister_device(input_dev);
+	device_del(&ir_dev->dev);
+
+	module_put(THIS_MODULE);
+}
+
+/*
+ * Init/exit code for the module. Basically, creates/removes /sys/class/rc
+ */
+
+static int __init ir_core_init(void)
+{
+	int rc = class_register(&ir_input_class);
+	if (rc) {
+		printk(KERN_ERR "ir_core: unable to register rc class\n");
+		return rc;
+	}
+
+	/* Initialize/load the decoders/keymap code that will be used */
+	ir_raw_init();
+
+	return 0;
+}
+
+static void __exit ir_core_exit(void)
+{
+	class_unregister(&ir_input_class);
+}
+
+module_init(ir_core_init);
+module_exit(ir_core_exit);