sysfs channels: dahdi-sysfs-chan.c

* Move sysfs class and device files management into dahdi-sysfs-chan.c
* This does not change functionality, just a preparation for later
  code cleanups and improvements.

Signed-off-by: Oron Peled <oron.peled@xorcom.com>
Acked-by: Tzafrir Cohen <tzafrir.cohen@xorcom.com>
Acked-by: Shaun Ruffell <sruffell@digium.com>

git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@10463 a0bf4364-ded3-4de4-8d8a-66a801d63aff

1 files changed, 170 insertions, 0 deletions

diff --git a/drivers/dahdi/dahdi-sysfs-chan.c b/drivers/dahdi/dahdi-sysfs-chan.c
new file mode 100644
index 0000000..e54ddf0
--- /dev/null
+++ b/drivers/dahdi/dahdi-sysfs-chan.c
@@ -0,0 +1,170 @@
+#include <linux/version.h>
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0)
+#  warning "This module is tested only with 2.6 kernels"
+#endif
+
+#define DAHDI_PRINK_MACROS_USE_debug
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <dahdi/kernel.h>
+#include "dahdi.h"
+#include "dahdi-sysfs.h"
+
+#define MAKE_DAHDI_DEV(num, name) \
+	CLASS_DEV_CREATE(dahdi_class, MKDEV(DAHDI_MAJOR, num), NULL, name)
+#define DEL_DAHDI_DEV(num) \
+	CLASS_DEV_DESTROY(dahdi_class, MKDEV(DAHDI_MAJOR, num))
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 13)
+static struct class *dahdi_class;
+#else
+static struct class_simple *dahdi_class;
+#define class_create class_simple_create
+#define class_destroy class_simple_destroy
+#endif
+
+int chan_sysfs_create(struct dahdi_chan *chan)
+{
+	char chan_name[32];
+	void *dummy;
+	int res = 0;
+
+	if (chan->channo >= 250)
+		return 0;
+	if (test_bit(DAHDI_FLAGBIT_DEVFILE, &chan->flags))
+		return 0;
+	snprintf(chan_name, sizeof(chan_name), "dahdi!%d", chan->channo);
+	dummy = (void *)CLASS_DEV_CREATE(dahdi_class,
+		MKDEV(DAHDI_MAJOR, chan->channo),
+		NULL, chan_name);
+	if (IS_ERR(dummy)) {
+		res = PTR_ERR(dummy);
+		chan_err(chan, "Failed creating sysfs device: %d\n",
+				res);
+		return res;
+	}
+	set_bit(DAHDI_FLAGBIT_DEVFILE, &chan->flags);
+	return 0;
+}
+
+void chan_sysfs_remove(struct dahdi_chan *chan)
+{
+	if (!test_bit(DAHDI_FLAGBIT_DEVFILE, &chan->flags))
+		return;
+	CLASS_DEV_DESTROY(dahdi_class, MKDEV(DAHDI_MAJOR, chan->channo));
+	clear_bit(DAHDI_FLAGBIT_DEVFILE, &chan->flags);
+}
+
+int dahdi_register_chardev(struct dahdi_chardev *dev)
+{
+	static const char *DAHDI_STRING = "dahdi!";
+	char *udevname;
+
+	udevname = kzalloc(strlen(dev->name) + sizeof(DAHDI_STRING) + 1,
+			   GFP_KERNEL);
+	if (!udevname)
+		return -ENOMEM;
+
+	strcpy(udevname, DAHDI_STRING);
+	strcat(udevname, dev->name);
+	CLASS_DEV_CREATE(dahdi_class,
+		MKDEV(DAHDI_MAJOR, dev->minor), NULL, udevname);
+	kfree(udevname);
+	return 0;
+}
+EXPORT_SYMBOL(dahdi_register_chardev);
+
+int dahdi_unregister_chardev(struct dahdi_chardev *dev)
+{
+	CLASS_DEV_DESTROY(dahdi_class, MKDEV(DAHDI_MAJOR, dev->minor));
+
+	return 0;
+}
+EXPORT_SYMBOL(dahdi_unregister_chardev);
+
+/* Only used to flag that the device exists: */
+static struct {
+	unsigned int ctl:1;
+	unsigned int timer:1;
+	unsigned int channel:1;
+	unsigned int pseudo:1;
+} dummy_dev;
+
+int __init dahdi_sysfs_chan_init(const struct file_operations *fops)
+{
+	int res = 0;
+	void *dev;
+
+	dahdi_class = class_create(THIS_MODULE, "dahdi");
+	if (IS_ERR(dahdi_class)) {
+		res = PTR_ERR(dahdi_class);
+		dahdi_err("%s: class_create(dahi_chan) failed. Error: %d\n",
+			__func__, res);
+		goto cleanup;
+	}
+	dahdi_dbg(DEVICES, "Creating /dev/dahdi/timer:\n");
+	dev = MAKE_DAHDI_DEV(DAHDI_TIMER, "dahdi!timer");
+	if (IS_ERR(dev)) {
+		res = PTR_ERR(dev);
+		goto cleanup;
+	}
+	dummy_dev.timer = 1;
+
+	dahdi_dbg(DEVICES, "Creating /dev/dahdi/channel:\n");
+	dev = MAKE_DAHDI_DEV(DAHDI_CHANNEL, "dahdi!channel");
+	if (IS_ERR(dev)) {
+		res = PTR_ERR(dev);
+		goto cleanup;
+	}
+	dummy_dev.channel = 1;
+
+	dahdi_dbg(DEVICES, "Creating /dev/dahdi/pseudo:\n");
+	dev = MAKE_DAHDI_DEV(DAHDI_PSEUDO, "dahdi!pseudo");
+	if (IS_ERR(dev)) {
+		res = PTR_ERR(dev);
+		goto cleanup;
+	}
+	dummy_dev.pseudo = 1;
+
+	dahdi_dbg(DEVICES, "Creating /dev/dahdi/ctl:\n");
+	dev = MAKE_DAHDI_DEV(DAHDI_CTL, "dahdi!ctl");
+	if (IS_ERR(dev)) {
+		res = PTR_ERR(dev);
+		goto cleanup;
+	}
+	dummy_dev.ctl = 1;
+	return 0;
+cleanup:
+	dahdi_sysfs_chan_exit();
+	return res;
+}
+
+void dahdi_sysfs_chan_exit(void)
+{
+	if (dummy_dev.pseudo) {
+		dahdi_dbg(DEVICES, "Removing /dev/dahdi/pseudo:\n");
+		DEL_DAHDI_DEV(DAHDI_PSEUDO);
+		dummy_dev.pseudo = 0;
+	}
+	if (dummy_dev.channel) {
+		dahdi_dbg(DEVICES, "Removing /dev/dahdi/channel:\n");
+		DEL_DAHDI_DEV(DAHDI_CHANNEL);
+		dummy_dev.channel = 0;
+	}
+	if (dummy_dev.timer) {
+		dahdi_dbg(DEVICES, "Removing /dev/dahdi/timer:\n");
+		DEL_DAHDI_DEV(DAHDI_TIMER);
+		dummy_dev.timer = 0;
+	}
+	if (dummy_dev.ctl) {
+		dahdi_dbg(DEVICES, "Removing /dev/dahdi/ctl:\n");
+		DEL_DAHDI_DEV(DAHDI_CTL);
+		dummy_dev.ctl = 0;
+	}
+	if (dahdi_class && !IS_ERR(dahdi_class)) {
+		dahdi_dbg(DEVICES, "Destroying DAHDI class\n");
+		class_destroy(dahdi_class);
+		dahdi_class = NULL;
+	}
+}