[PATCH] i4l gigaset: move sysfs entry to tty class device

Using the class device pointer returned by tty_register_device() with
part 1 of the patch, attach the Gigaset drivers' "cidmode" sysfs entry
to its tty class device, where it can be found more easily by users
who do not know nor care which USB port the device is attached to.

Signed-off-by: Hansjoerg Lipp <hjlipp@web.de>
Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

4 files changed, 30 insertions, 15 deletions

diff --git a/drivers/isdn/gigaset/common.c b/drivers/isdn/gigaset/common.c
index e55767b2ccd3..acb7e2656780 100644
--- a/drivers/isdn/gigaset/common.c
+++ b/drivers/isdn/gigaset/common.c
@@ -460,6 +460,9 @@ void gigaset_freecs(struct cardstate *cs)
 
 	switch (cs->cs_init) {
 	default:
+		/* clear device sysfs */
+		gigaset_free_dev_sysfs(cs);
+
 		gigaset_if_free(cs);
 
 		gig_dbg(DEBUG_INIT, "clearing hw");
@@ -699,6 +702,7 @@ struct cardstate *gigaset_initcs(struct gigaset_driver *drv, int channels,
 	cs->open_count = 0;
 	cs->dev = NULL;
 	cs->tty = NULL;
+	cs->class = NULL;
 	cs->cidmode = cidmode != 0;
 
 	//if(onechannel) { //FIXME
@@ -760,6 +764,9 @@ struct cardstate *gigaset_initcs(struct gigaset_driver *drv, int channels,
 
 	gigaset_if_init(cs);
 
+	/* set up device sysfs */
+	gigaset_init_dev_sysfs(cs);
+
 	spin_lock_irqsave(&cs->lock, flags);
 	cs->running = 1;
 	spin_unlock_irqrestore(&cs->lock, flags);
@@ -902,9 +909,6 @@ int gigaset_start(struct cardstate *cs)
 
 	wait_event(cs->waitqueue, !cs->waiting);
 
-	/* set up device sysfs */
-	gigaset_init_dev_sysfs(cs);
-
 	mutex_unlock(&cs->mutex);
 	return 1;
 
@@ -969,9 +973,6 @@ void gigaset_stop(struct cardstate *cs)
 		//FIXME
 	}
 
-	/* clear device sysfs */
-	gigaset_free_dev_sysfs(cs);
-
 	cleanup_cs(cs);
 
 exit:
diff --git a/drivers/isdn/gigaset/gigaset.h b/drivers/isdn/gigaset/gigaset.h
index 22b9693f7c0a..8d63d822104f 100644
--- a/drivers/isdn/gigaset/gigaset.h
+++ b/drivers/isdn/gigaset/gigaset.h
@@ -445,6 +445,7 @@ struct cardstate {
 	struct gigaset_driver *driver;
 	unsigned minor_index;
 	struct device *dev;
+	struct class_device *class;
 
 	const struct gigaset_ops *ops;
 
diff --git a/drivers/isdn/gigaset/interface.c b/drivers/isdn/gigaset/interface.c
index 08e4c4eea14d..74fd234956c8 100644
--- a/drivers/isdn/gigaset/interface.c
+++ b/drivers/isdn/gigaset/interface.c
@@ -625,7 +625,14 @@ void gigaset_if_init(struct cardstate *cs)
 		return;
 
 	tasklet_init(&cs->if_wake_tasklet, &if_wake, (unsigned long) cs);
-	tty_register_device(drv->tty, cs->minor_index, NULL);
+	cs->class = tty_register_device(drv->tty, cs->minor_index, NULL);
+
+	if (!IS_ERR(cs->class))
+		class_set_devdata(cs->class, cs);
+	else {
+		warn("could not register device to the tty subsystem");
+		cs->class = NULL;
+	}
 }
 
 void gigaset_if_free(struct cardstate *cs)
@@ -638,6 +645,7 @@ void gigaset_if_free(struct cardstate *cs)
 
 	tasklet_disable(&cs->if_wake_tasklet);
 	tasklet_kill(&cs->if_wake_tasklet);
+	cs->class = NULL;
 	tty_unregister_device(drv->tty, cs->minor_index);
 }
 
diff --git a/drivers/isdn/gigaset/proc.c b/drivers/isdn/gigaset/proc.c
index d267a636b53c..9ae3a7f3e7b3 100644
--- a/drivers/isdn/gigaset/proc.c
+++ b/drivers/isdn/gigaset/proc.c
@@ -16,12 +16,11 @@
 #include "gigaset.h"
 #include <linux/ctype.h>
 
-static ssize_t show_cidmode(struct device *dev, struct device_attribute *attr,
-			    char *buf)
+static ssize_t show_cidmode(struct class_device *class, char *buf)
 {
 	int ret;
 	unsigned long flags;
-	struct cardstate *cs = dev_get_drvdata(dev);
+	struct cardstate *cs = class_get_devdata(class);
 
 	spin_lock_irqsave(&cs->lock, flags);
 	ret = sprintf(buf, "%u\n", cs->cidmode);
@@ -30,10 +29,10 @@ static ssize_t show_cidmode(struct device *dev, struct device_attribute *attr,
 	return ret;
 }
 
-static ssize_t set_cidmode(struct device *dev, struct device_attribute *attr,
+static ssize_t set_cidmode(struct class_device *class,
 			   const char *buf, size_t count)
 {
-	struct cardstate *cs = dev_get_drvdata(dev);
+	struct cardstate *cs = class_get_devdata(class);
 	long int value;
 	char *end;
 
@@ -65,18 +64,24 @@ static ssize_t set_cidmode(struct device *dev, struct device_attribute *attr,
 	return count;
 }
 
-static DEVICE_ATTR(cidmode, S_IRUGO|S_IWUSR, show_cidmode, set_cidmode);
+static CLASS_DEVICE_ATTR(cidmode, S_IRUGO|S_IWUSR, show_cidmode, set_cidmode);
 
 /* free sysfs for device */
 void gigaset_free_dev_sysfs(struct cardstate *cs)
 {
+	if (!cs->class)
+		return;
+
 	gig_dbg(DEBUG_INIT, "removing sysfs entries");
-	device_remove_file(cs->dev, &dev_attr_cidmode);
+	class_device_remove_file(cs->class, &class_device_attr_cidmode);
 }
 
 /* initialize sysfs for device */
 void gigaset_init_dev_sysfs(struct cardstate *cs)
 {
+	if (!cs->class)
+		return;
+
 	gig_dbg(DEBUG_INIT, "setting up sysfs");
-	device_create_file(cs->dev, &dev_attr_cidmode);
+	class_device_create_file(cs->class, &class_device_attr_cidmode);
 }