mISDN: Create /sys/class/mISDN

Create /sys/class/mISDN and implement functions to handle
device renames.

Signed-Off-By: Matthias Urlichs <matthias@urlichs.de>
Signed-off-by: Karsten Keil <kkeil@suse.de>

5 files changed, 273 insertions, 115 deletions

diff --git a/drivers/isdn/hardware/mISDN/hfcmulti.c b/drivers/isdn/hardware/mISDN/hfcmulti.c
index cd3f3994b7f..97f4708b387 100644
--- a/drivers/isdn/hardware/mISDN/hfcmulti.c
+++ b/drivers/isdn/hardware/mISDN/hfcmulti.c
@@ -4718,7 +4718,7 @@ init_e1_port(struct hfc_multi *hc, struct hm_map *m)
 	} else
 		hc->chan[hc->dslot].jitter = 2; /* default */
 	snprintf(name, MISDN_MAX_IDLEN - 1, "hfc-e1.%d", HFC_cnt + 1);
-	ret = mISDN_register_device(&dch->dev, name);
+	ret = mISDN_register_device(&dch->dev, &hc->pci_dev->dev, name);
 	if (ret)
 		goto free_chan;
 	hc->created[0] = 1;
@@ -4826,9 +4826,9 @@ init_multi_port(struct hfc_multi *hc, int pt)
 		test_and_set_bit(HFC_CFG_DIS_ECHANNEL,
 		    &hc->chan[i + 2].cfg);
 	}
-	snprintf(name, MISDN_MAX_IDLEN - 1, "hfc-%ds.%d/%d",
+	snprintf(name, MISDN_MAX_IDLEN - 1, "hfc-%ds.%d-%d",
 		hc->type, HFC_cnt + 1, pt + 1);
-	ret = mISDN_register_device(&dch->dev, name);
+	ret = mISDN_register_device(&dch->dev, &hc->pci_dev->dev, name);
 	if (ret)
 		goto free_chan;
 	hc->created[pt] = 1;
diff --git a/drivers/isdn/hardware/mISDN/hfcpci.c b/drivers/isdn/hardware/mISDN/hfcpci.c
index cd5d26c9909..8df12bf02af 100644
--- a/drivers/isdn/hardware/mISDN/hfcpci.c
+++ b/drivers/isdn/hardware/mISDN/hfcpci.c
@@ -64,9 +64,6 @@ MODULE_LICENSE("GPL");
 module_param(debug, uint, 0);
 module_param(poll, uint, S_IRUGO | S_IWUSR);
 
-static LIST_HEAD(HFClist);
-static DEFINE_RWLOCK(HFClock);
-
 enum {
 	HFC_CCD_2BD0,
 	HFC_CCD_B000,
@@ -136,7 +133,6 @@ struct hfcPCI_hw {
 
 
 struct hfc_pci {
-	struct list_head	list;
 	u_char			subtype;
 	u_char			chanlimit;
 	u_char			initdone;
@@ -1227,41 +1223,6 @@ hfcpci_int(int intno, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-static void
-hfcpci_softirq(void *arg)
-{
-	u_long		flags;
-	struct bchannel	*bch;
-	struct hfc_pci	*hc;
-
-	write_lock_irqsave(&HFClock, flags);
-	list_for_each_entry(hc, &HFClist, list) {
-		if (hc->hw.int_m2 & HFCPCI_IRQ_ENABLE) {
-			spin_lock(&hc->lock);
-			bch = Sel_BCS(hc, hc->hw.bswapped ? 2 : 1);
-			if (bch && bch->state == ISDN_P_B_RAW) { /* B1 rx&tx */
-				main_rec_hfcpci(bch);
-				tx_birq(bch);
-			}
-			bch = Sel_BCS(hc, hc->hw.bswapped ? 1 : 2);
-			if (bch && bch->state == ISDN_P_B_RAW) { /* B2 rx&tx */
-				main_rec_hfcpci(bch);
-				tx_birq(bch);
-			}
-			spin_unlock(&hc->lock);
-		}
-	}
-	write_unlock_irqrestore(&HFClock, flags);
-
-	/* if next event would be in the past ... */
-	if ((s32)(hfc_jiffies + tics - jiffies) <= 0)
-		hfc_jiffies = jiffies + 1;
-	else
-		hfc_jiffies += tics;
-	hfc_tl.expires = hfc_jiffies;
-	add_timer(&hfc_tl);
-}
-
 /*
  * timer callback for D-chan busy resolution. Currently no function
  */
@@ -2131,7 +2092,6 @@ release_card(struct hfc_pci *hc) {
 	mISDN_freebchannel(&hc->bch[1]);
 	mISDN_freebchannel(&hc->bch[0]);
 	mISDN_freedchannel(&hc->dch);
-	list_del(&hc->list);
 	pci_set_drvdata(hc->pdev, NULL);
 	kfree(hc);
 }
@@ -2141,7 +2101,6 @@ setup_card(struct hfc_pci *card)
 {
 	int		err = -EINVAL;
 	u_int		i;
-	u_long		flags;
 	char		name[MISDN_MAX_IDLEN];
 
 	card->dch.debug = debug;
@@ -2169,13 +2128,10 @@ setup_card(struct hfc_pci *card)
 	if (err)
 		goto error;
 	snprintf(name, MISDN_MAX_IDLEN - 1, "hfc-pci.%d", HFC_cnt + 1);
-	err = mISDN_register_device(&card->dch.dev, name);
+	err = mISDN_register_device(&card->dch.dev, &card->pdev->dev, name);
 	if (err)
 		goto error;
 	HFC_cnt++;
-	write_lock_irqsave(&HFClock, flags);
-	list_add_tail(&card->list, &HFClist);
-	write_unlock_irqrestore(&HFClock, flags);
 	printk(KERN_INFO "HFC %d cards installed\n", HFC_cnt);
 	return 0;
 error:
@@ -2311,15 +2267,12 @@ static void __devexit
 hfc_remove_pci(struct pci_dev *pdev)
 {
 	struct hfc_pci	*card = pci_get_drvdata(pdev);
-	u_long		flags;
 
-	if (card) {
-		write_lock_irqsave(&HFClock, flags);
+	if (card)
 		release_card(card);
-		write_unlock_irqrestore(&HFClock, flags);
-	} else
+	else
 		if (debug)
-			printk(KERN_WARNING "%s: drvdata allready removed\n",
+			printk(KERN_WARNING "%s: drvdata already removed\n",
 			    __func__);
 }
 
@@ -2331,6 +2284,46 @@ static struct pci_driver hfc_driver = {
 	.id_table = hfc_ids,
 };
 
+static int
+_hfcpci_softirq(struct device *dev, void *arg)
+{
+	struct hfc_pci  *hc = dev_get_drvdata(dev);
+	struct bchannel *bch;
+	if (hc == NULL)
+		return 0;
+
+	if (hc->hw.int_m2 & HFCPCI_IRQ_ENABLE) {
+		spin_lock(&hc->lock);
+		bch = Sel_BCS(hc, hc->hw.bswapped ? 2 : 1);
+		if (bch && bch->state == ISDN_P_B_RAW) { /* B1 rx&tx */
+			main_rec_hfcpci(bch);
+			tx_birq(bch);
+		}
+		bch = Sel_BCS(hc, hc->hw.bswapped ? 1 : 2);
+		if (bch && bch->state == ISDN_P_B_RAW) { /* B2 rx&tx */
+			main_rec_hfcpci(bch);
+			tx_birq(bch);
+		}
+		spin_unlock(&hc->lock);
+	}
+	return 0;
+}
+
+static void
+hfcpci_softirq(void *arg)
+{
+	(void) driver_for_each_device(&hfc_driver.driver, NULL, arg,
+					_hfcpci_softirq);
+
+	/* if next event would be in the past ... */
+	if ((s32)(hfc_jiffies + tics - jiffies) <= 0)
+		hfc_jiffies = jiffies + 1;
+	else
+		hfc_jiffies += tics;
+	hfc_tl.expires = hfc_jiffies;
+	add_timer(&hfc_tl);
+}
+
 static int __init
 HFC_init(void)
 {
@@ -2375,14 +2368,9 @@ HFC_init(void)
 static void __exit
 HFC_cleanup(void)
 {
-	struct hfc_pci	*card, *next;
-
 	if (timer_pending(&hfc_tl))
 		del_timer(&hfc_tl);
 
-	list_for_each_entry_safe(card, next, &HFClist, list) {
-		release_card(card);
-	}
 	pci_unregister_driver(&hfc_driver);
 }
 
diff --git a/drivers/isdn/mISDN/core.c b/drivers/isdn/mISDN/core.c
index 9116f54def2..9426c9827e4 100644
--- a/drivers/isdn/mISDN/core.c
+++ b/drivers/isdn/mISDN/core.c
@@ -25,39 +25,183 @@ MODULE_AUTHOR("Karsten Keil");
 MODULE_LICENSE("GPL");
 module_param(debug, uint, S_IRUGO | S_IWUSR);
 
-static LIST_HEAD(devices);
-static DEFINE_RWLOCK(device_lock);
 static u64		device_ids;
 #define MAX_DEVICE_ID	63
 
 static LIST_HEAD(Bprotocols);
 static DEFINE_RWLOCK(bp_lock);
 
+static void mISDN_dev_release(struct device *dev)
+{
+	/* nothing to do: the device is part of its parent's data structure */
+}
+
+static ssize_t _show_id(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct mISDNdevice *mdev = dev_to_mISDN(dev);
+
+	if (!mdev)
+		return -ENODEV;
+	return sprintf(buf, "%d\n", mdev->id);
+}
+
+static ssize_t _show_nrbchan(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct mISDNdevice *mdev = dev_to_mISDN(dev);
+
+	if (!mdev)
+		return -ENODEV;
+	return sprintf(buf, "%d\n", mdev->nrbchan);
+}
+
+static ssize_t _show_d_protocols(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct mISDNdevice *mdev = dev_to_mISDN(dev);
+
+	if (!mdev)
+		return -ENODEV;
+	return sprintf(buf, "%d\n", mdev->Dprotocols);
+}
+
+static ssize_t _show_b_protocols(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct mISDNdevice *mdev = dev_to_mISDN(dev);
+
+	if (!mdev)
+		return -ENODEV;
+	return sprintf(buf, "%d\n", mdev->Bprotocols | get_all_Bprotocols());
+}
+
+static ssize_t _show_protocol(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct mISDNdevice *mdev = dev_to_mISDN(dev);
+
+	if (!mdev)
+		return -ENODEV;
+	return sprintf(buf, "%d\n", mdev->D.protocol);
+}
+
+static ssize_t _show_name(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	strcpy(buf, dev_name(dev));
+	return strlen(buf);
+}
+
+#if 0 /* hangs */
+static ssize_t _set_name(struct device *dev, struct device_attribute *attr,
+				const char *buf, size_t count)
+{
+	int err = 0;
+	char *out = kmalloc(count + 1, GFP_KERNEL);
+
+	if (!out)
+		return -ENOMEM;
+
+	memcpy(out, buf, count);
+	if (count && out[count - 1] == '\n')
+		out[--count] = 0;
+	if (count)
+		err = device_rename(dev, out);
+	kfree(out);
+
+	return (err < 0) ? err : count;
+}
+#endif
+
+static ssize_t _show_channelmap(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct mISDNdevice *mdev = dev_to_mISDN(dev);
+	char *bp = buf;
+	int i;
+
+	for (i = 0; i <= mdev->nrbchan; i++)
+		*bp++ = test_channelmap(i, mdev->channelmap) ? '1' : '0';
+
+	return bp - buf;
+}
+
+static struct device_attribute mISDN_dev_attrs[] = {
+	__ATTR(id,          S_IRUGO,         _show_id,          NULL),
+	__ATTR(d_protocols, S_IRUGO,         _show_d_protocols, NULL),
+	__ATTR(b_protocols, S_IRUGO,         _show_b_protocols, NULL),
+	__ATTR(protocol,    S_IRUGO,         _show_protocol,    NULL),
+	__ATTR(channelmap,  S_IRUGO,         _show_channelmap,  NULL),
+	__ATTR(nrbchan,     S_IRUGO,         _show_nrbchan,     NULL),
+	__ATTR(name,        S_IRUGO,         _show_name,        NULL),
+/*	__ATTR(name,        S_IRUGO|S_IWUSR, _show_name,       _set_name), */
+	{}
+};
+
+#ifdef CONFIG_HOTPLUG
+static int mISDN_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+	struct mISDNdevice *mdev = dev_to_mISDN(dev);
+
+	if (!mdev)
+		return 0;
+
+	if (add_uevent_var(env, "nchans=%d", mdev->nrbchan))
+		return -ENOMEM;
+
+	return 0;
+}
+#endif
+
+static void mISDN_class_release(struct class *cls)
+{
+	/* do nothing, it's static */
+}
+
+static struct class mISDN_class = {
+	.name = "mISDN",
+	.owner = THIS_MODULE,
+#ifdef CONFIG_HOTPLUG
+	.dev_uevent = mISDN_uevent,
+#endif
+	.dev_attrs = mISDN_dev_attrs,
+	.dev_release = mISDN_dev_release,
+	.class_release = mISDN_class_release,
+};
+
+static int
+_get_mdevice(struct device *dev, void *id)
+{
+	struct mISDNdevice *mdev = dev_to_mISDN(dev);
+
+	if (!mdev)
+		return 0;
+	if (mdev->id != *(u_int *)id)
+		return 0;
+	return 1;
+}
+
 struct mISDNdevice
 *get_mdevice(u_int id)
 {
-	struct mISDNdevice	*dev;
+	return dev_to_mISDN(class_find_device(&mISDN_class, NULL, &id,
+		_get_mdevice));
+}
 
-	read_lock(&device_lock);
-	list_for_each_entry(dev, &devices, D.list)
-		if (dev->id == id) {
-			read_unlock(&device_lock);
-			return dev;
-		}
-	read_unlock(&device_lock);
-	return NULL;
+static int
+_get_mdevice_count(struct device *dev, void *cnt)
+{
+	*(int *)cnt += 1;
+	return 0;
 }
 
 int
 get_mdevice_count(void)
 {
-	struct mISDNdevice	*dev;
-	int			cnt = 0;
+	int cnt = 0;
 
-	read_lock(&device_lock);
-	list_for_each_entry(dev, &devices, D.list)
-		cnt++;
-	read_unlock(&device_lock);
+	class_for_each_device(&mISDN_class, NULL, &cnt, _get_mdevice_count);
 	return cnt;
 }
 
@@ -68,19 +212,24 @@ get_free_devid(void)
 
 	for (i = 0; i <= MAX_DEVICE_ID; i++)
 		if (!test_and_set_bit(i, (u_long *)&device_ids))
-			return i;
-	return -1;
+			break;
+	if (i > MAX_DEVICE_ID)
+		return -1;
+	return i;
 }
 
 int
-mISDN_register_device(struct mISDNdevice *dev, char *name)
+mISDN_register_device(struct mISDNdevice *dev,
+			struct device *parent, char *name)
 {
-	u_long	flags;
 	int	err;
 
 	dev->id = get_free_devid();
+	err = -EBUSY;
 	if (dev->id < 0)
-		return -EBUSY;
+		goto error1;
+
+	device_initialize(&dev->dev);
 	if (name && name[0])
 		dev_set_name(&dev->dev, "%s", name);
 	else
@@ -90,26 +239,39 @@ mISDN_register_device(struct mISDNdevice *dev, char *name)
 			dev_name(&dev->dev), dev->id);
 	err = create_stack(dev);
 	if (err)
-		return err;
-	write_lock_irqsave(&device_lock, flags);
-	list_add_tail(&dev->D.list, &devices);
-	write_unlock_irqrestore(&device_lock, flags);
+		goto error1;
+
+	dev->dev.class = &mISDN_class;
+	dev->dev.platform_data = dev;
+	dev->dev.parent = parent;
+	dev_set_drvdata(&dev->dev, dev);
+
+	err = device_add(&dev->dev);
+	if (err)
+		goto error3;
 	return 0;
+
+error3:
+	delete_stack(dev);
+	return err;
+error1:
+	return err;
+
 }
 EXPORT_SYMBOL(mISDN_register_device);
 
 void
 mISDN_unregister_device(struct mISDNdevice *dev) {
-	u_long	flags;
-
 	if (debug & DEBUG_CORE)
 		printk(KERN_DEBUG "mISDN_unregister %s %d\n",
 			dev_name(&dev->dev), dev->id);
-	write_lock_irqsave(&device_lock, flags);
-	list_del(&dev->D.list);
-	write_unlock_irqrestore(&device_lock, flags);
+	/* sysfs_remove_link(&dev->dev.kobj, "device"); */
+	device_del(&dev->dev);
+	dev_set_drvdata(&dev->dev, NULL);
+
 	test_and_clear_bit(dev->id, (u_long *)&device_ids);
 	delete_stack(dev);
+	put_device(&dev->dev);
 }
 EXPORT_SYMBOL(mISDN_unregister_device);
 
@@ -201,42 +363,43 @@ mISDNInit(void)
 		MISDN_MAJOR_VERSION, MISDN_MINOR_VERSION, MISDN_RELEASE);
 	mISDN_init_clock(&debug);
 	mISDN_initstack(&debug);
+	err = class_register(&mISDN_class);
+	if (err)
+		goto error1;
 	err = mISDN_inittimer(&debug);
 	if (err)
-		goto error;
+		goto error2;
 	err = l1_init(&debug);
-	if (err) {
-		mISDN_timer_cleanup();
-		goto error;
-	}
+	if (err)
+		goto error3;
 	err = Isdnl2_Init(&debug);
-	if (err) {
-		mISDN_timer_cleanup();
-		l1_cleanup();
-		goto error;
-	}
+	if (err)
+		goto error4;
 	err = misdn_sock_init(&debug);
-	if (err) {
-		mISDN_timer_cleanup();
-		l1_cleanup();
-		Isdnl2_cleanup();
-	}
-error:
+	if (err)
+		goto error5;
+	return 0;
+
+error5:
+	Isdnl2_cleanup();
+error4:
+	l1_cleanup();
+error3:
+	mISDN_timer_cleanup();
+error2:
+	class_unregister(&mISDN_class);
+error1:
 	return err;
 }
 
 static void mISDN_cleanup(void)
 {
 	misdn_sock_cleanup();
-	mISDN_timer_cleanup();
-	l1_cleanup();
 	Isdnl2_cleanup();
+	l1_cleanup();
+	mISDN_timer_cleanup();
+	class_unregister(&mISDN_class);
 
-	if (!list_empty(&devices))
-		printk(KERN_ERR "%s devices still registered\n", __func__);
-
-	if (!list_empty(&Bprotocols))
-		printk(KERN_ERR "%s Bprotocols still registered\n", __func__);
 	printk(KERN_DEBUG "mISDNcore unloaded\n");
 }
 
diff --git a/drivers/isdn/mISDN/l1oip_core.c b/drivers/isdn/mISDN/l1oip_core.c
index a6a9e1af2ad..abe57498957 100644
--- a/drivers/isdn/mISDN/l1oip_core.c
+++ b/drivers/isdn/mISDN/l1oip_core.c
@@ -1433,7 +1433,8 @@ init_card(struct l1oip *hc, int pri, int bundle)
 		hc->chan[i + ch].bch = bch;
 		set_channelmap(bch->nr, dch->dev.channelmap);
 	}
-	ret = mISDN_register_device(&dch->dev, hc->name);
+	/* TODO: create a parent device for this driver */
+	ret = mISDN_register_device(&dch->dev, NULL, hc->name);
 	if (ret)
 		return ret;
 	hc->registered = 1;
diff --git a/include/linux/mISDNif.h b/include/linux/mISDNif.h
index 3f9988849f3..d4229aebf64 100644
--- a/include/linux/mISDNif.h
+++ b/include/linux/mISDNif.h
@@ -531,7 +531,8 @@ _queue_data(struct mISDNchannel *ch, u_int prim,
 
 /* global register/unregister functions */
 
-extern int	mISDN_register_device(struct mISDNdevice *, char *name);
+extern int	mISDN_register_device(struct mISDNdevice *,
+					struct device *parent, char *name);
 extern void	mISDN_unregister_device(struct mISDNdevice *);
 extern int	mISDN_register_Bprotocol(struct Bprotocol *);
 extern void	mISDN_unregister_Bprotocol(struct Bprotocol *);
@@ -539,6 +540,11 @@ extern struct mISDNclock *mISDN_register_clock(char *, int, clockctl_func_t *,
 						void *);
 extern void	mISDN_unregister_clock(struct mISDNclock *);
 
+static inline struct mISDNdevice *dev_to_mISDN(struct device *dev)
+{
+	return dev_get_drvdata(dev);
+}
+
 extern void	set_channel_address(struct mISDNchannel *, u_int, u_int);
 extern void	mISDN_clock_update(struct mISDNclock *, int, struct timeval *);
 extern unsigned short mISDN_clock_get(void);