[alsa-devel] [PATCH] ALSA: mts64: use new parport device model

[Sudip Mukherjee]

Modify mts64 driver to use the new parallel port device model.
The advantage of using the device model is that the driver gets binded
to the hardware, we get the feature of hotplug, we can bind/unbind the
driver at runtime.
The changes are in the way the driver gets registered with the parallel
port subsystem and the temporary device to probe mts64 card is removed
and mts64_probe() is used in the probe callback.

Signed-off-by: Sudip Mukherjee <sudip.mukherjee at codethink.co.uk>
---

exactly same changes as done in portman2x4.

BTW, there is one portman2x4 available on ebay. I was bidding for it but
someone is more desperate than I am and outbidding me everytime :(

 sound/drivers/mts64.c | 95 +++++++++++++++++++++++----------------------------
 1 file changed, 43 insertions(+), 52 deletions(-)

diff --git a/sound/drivers/mts64.c b/sound/drivers/mts64.c
index 2a008a9..c76bd87 100644
--- a/sound/drivers/mts64.c
+++ b/sound/drivers/mts64.c
@@ -65,8 +65,6 @@ struct mts64 {
 	struct snd_card *card;
 	struct snd_rawmidi *rmidi;
 	struct pardevice *pardev;
-	int pardev_claimed;
-
 	int open_count;
 	int current_midi_output_port;
 	int current_midi_input_port;
@@ -850,30 +848,6 @@ __out:
 	spin_unlock(&mts->lock);
 }
 
-static int snd_mts64_probe_port(struct parport *p)
-{
-	struct pardevice *pardev;
-	int res;
-
-	pardev = parport_register_device(p, DRIVER_NAME,
-					 NULL, NULL, NULL,
-					 0, NULL);
-	if (!pardev)
-		return -EIO;
-	
-	if (parport_claim(pardev)) {
-		parport_unregister_device(pardev);
-		return -EIO;
-	}
-
-	res = mts64_probe(p);
-
-	parport_release(pardev);
-	parport_unregister_device(pardev);
-
-	return res;
-}
-
 static void snd_mts64_attach(struct parport *p)
 {
 	struct platform_device *device;
@@ -907,10 +881,20 @@ static void snd_mts64_detach(struct parport *p)
 	/* nothing to do here */
 }
 
+static int snd_mts64_dev_probe(struct pardevice *pardev)
+{
+	if (strcmp(pardev->name, DRIVER_NAME))
+		return -ENODEV;
+
+	return 0;
+}
+
 static struct parport_driver mts64_parport_driver = {
-	.name   = "mts64",
-	.attach = snd_mts64_attach,
-	.detach = snd_mts64_detach
+	.name		= "mts64",
+	.probe		= snd_mts64_dev_probe,
+	.match_port	= snd_mts64_attach,
+	.detach		= snd_mts64_detach,
+	.devmodel	= true,
 };
 
 /*********************************************************************
@@ -922,8 +906,7 @@ static void snd_mts64_card_private_free(struct snd_card *card)
 	struct pardevice *pardev = mts->pardev;
 
 	if (pardev) {
-		if (mts->pardev_claimed)
-			parport_release(pardev);
+		parport_release(pardev);
 		parport_unregister_device(pardev);
 	}
 
@@ -938,6 +921,12 @@ static int snd_mts64_probe(struct platform_device *pdev)
 	struct snd_card *card = NULL;
 	struct mts64 *mts = NULL;
 	int err;
+	struct pardev_cb mts64_cb = {
+		.preempt = NULL,
+		.wakeup = NULL,
+		.irq_func = snd_mts64_interrupt,	/* ISR */
+		.flags = PARPORT_DEV_EXCL,		/* flags */
+	};
 
 	p = platform_get_drvdata(pdev);
 	platform_set_drvdata(pdev, NULL);
@@ -946,8 +935,6 @@ static int snd_mts64_probe(struct platform_device *pdev)
 		return -ENODEV;
 	if (!enable[dev]) 
 		return -ENOENT;
-	if ((err = snd_mts64_probe_port(p)) < 0)
-		return err;
 
 	err = snd_card_new(&pdev->dev, index[dev], id[dev], THIS_MODULE,
 			   0, &card);
@@ -960,23 +947,32 @@ static int snd_mts64_probe(struct platform_device *pdev)
 	sprintf(card->longname,  "%s at 0x%lx, irq %i", 
 		card->shortname, p->base, p->irq);
 
-	pardev = parport_register_device(p,                   /* port */
-					 DRIVER_NAME,         /* name */
-					 NULL,                /* preempt */
-					 NULL,                /* wakeup */
-					 snd_mts64_interrupt, /* ISR */
-					 PARPORT_DEV_EXCL,    /* flags */
-					 (void *)card);       /* private */
-	if (pardev == NULL) {
+	mts64_cb.private = card;			 /* private */
+	pardev = parport_register_dev_model(p,		 /* port */
+					    DRIVER_NAME, /* name */
+					    &mts64_cb,	 /* callbacks */
+					    pdev->id);	 /* device number */
+	if (!pardev) {
 		snd_printd("Cannot register pardevice\n");
 		err = -EIO;
 		goto __err;
 	}
 
+	/* claim parport */
+	if (parport_claim(pardev)) {
+		snd_printd("Cannot claim parport 0x%lx\n", pardev->port->base);
+		err = -EIO;
+		goto free_pardev;
+	}
+	err = mts64_probe(p);
+	if (err) {
+		err = -EIO;
+		goto release_pardev;
+	}
+
 	if ((err = snd_mts64_create(card, pardev, &mts)) < 0) {
 		snd_printd("Cannot create main component\n");
-		parport_unregister_device(pardev);
-		goto __err;
+		goto release_pardev;
 	}
 	card->private_data = mts;
 	card->private_free = snd_mts64_card_private_free;
@@ -986,14 +982,6 @@ static int snd_mts64_probe(struct platform_device *pdev)
 		goto __err;
 	}
 
-	/* claim parport */
-	if (parport_claim(pardev)) {
-		snd_printd("Cannot claim parport 0x%lx\n", pardev->port->base);
-		err = -EIO;
-		goto __err;
-	}
-	mts->pardev_claimed = 1;
-
 	/* init device */
 	if ((err = mts64_device_init(p)) < 0)
 		goto __err;
@@ -1009,6 +997,10 @@ static int snd_mts64_probe(struct platform_device *pdev)
 	snd_printk(KERN_INFO "ESI Miditerminal 4140 on 0x%lx\n", p->base);
 	return 0;
 
+release_pardev:
+	parport_release(pardev);
+free_pardev:
+	parport_unregister_device(pardev);
 __err:
 	snd_card_free(card);
 	return err;
@@ -1024,7 +1016,6 @@ static int snd_mts64_remove(struct platform_device *pdev)
 	return 0;
 }
 
-
 static struct platform_driver snd_mts64_driver = {
 	.probe  = snd_mts64_probe,
 	.remove = snd_mts64_remove,
-- 
1.9.1