Re: [PATCH] 2.6.9-rc3 fix warnings in sound/drivers/opl3/opl3_lib.c

From: Takashi Iwai (tiwai_at_suse.de)
Date: 09/30/04

  • Next message: Ray Lee: "Re: [RFC][PATCH] inotify 0.10.0" 
    Date:	Thu, 30 Sep 2004 18:50:25 +0200
To: viro@parcelfarce.linux.theplanet.co.uk

    At Thu, 30 Sep 2004 18:07:10 +0200,
    I wrote:
    >
    > > Sigh... At the very least that kind of abuse should stop. FWIW, I would
    > > suggest having cs4281.c set the ->command() directly and killing that crap
    > > with ->l_port/->r_port overloading.
    >
    > Yes, it'd be definitely better.
    > Will work on it.

    The patch below. 

    --
Takashi Iwai <tiwai@suse.de>		ALSA Developer - www.alsa-project.org
==
Summary: Fix / clean up OPL3 for CS4281
Moved cs4281-specific code into cs4281 driver from opl3.
The ugly type-casting is removed now.
The opl3 instance can be created via snd_opl3_new() (followed by
snd_opl3_init()) to allow the driver to set its own command and
private_data/private_free.
snd_opl3_create() is kept for compatibility as it was.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
--- linux/include/sound/opl3.h	2003-03-25 16:13:46.000000000 +0100
+++ linux/include/sound/opl3.h	2004-09-30 18:25:00.000000000 +0200
@@ -274,6 +274,9 @@
 	snd_timer_t *timer2;
 	spinlock_t timer_lock;
 
+	void *private_data;
+	void (*private_free)(opl3_t *);
+
 	spinlock_t reg_lock;
 	snd_card_t *card;		/* The card that this belongs to */
 	int used;			/* usage flag - exclusive */
@@ -314,6 +317,8 @@
 
 /* opl3.c */
 void snd_opl3_interrupt(snd_hwdep_t * hw);
+int snd_opl3_new(snd_card_t *card, unsigned short hardware, opl3_t **ropl3);
+int snd_opl3_init(opl3_t *opl3);
 int snd_opl3_create(snd_card_t * card,
 		    unsigned long l_port, unsigned long r_port,
 		    unsigned short hardware,
--- linux/sound/drivers/opl3/opl3_lib.c	2004-09-16 19:34:18.000000000 +0200
+++ linux/sound/drivers/opl3/opl3_lib.c	2004-09-30 18:23:28.000000000 +0200
@@ -85,28 +85,6 @@
 	spin_unlock_irqrestore(&opl3->reg_lock, flags);
 }
 
-void snd_opl3_cs4281_command(opl3_t * opl3, unsigned short cmd, unsigned char val)
-{
-	unsigned long flags;
-	void __iomem *port;
-
-	/*
-	 * CS4281 requires a special access to I/O registers
-	 */
-
-	port = (void __iomem *)((cmd & OPL3_RIGHT) ? opl3->r_port : opl3->l_port);
-
-	spin_lock_irqsave(&opl3->reg_lock, flags);
-
-	writel((unsigned int)cmd, port);
-	udelay(10);
-
-	writel((unsigned int)val, port + 4);
-	udelay(30);
-
-	spin_unlock_irqrestore(&opl3->reg_lock, flags);
-}
-
 static int snd_opl3_detect(opl3_t * opl3)
 {
 	/*
@@ -344,6 +322,9 @@
 
 static int snd_opl3_free(opl3_t *opl3)
 {
+	snd_assert(opl3 != NULL, return -ENXIO);
+	if (opl3->private_free)
+		opl3->private_free(opl3);
 	if (opl3->res_l_port) {
 		release_resource(opl3->res_l_port);
 		kfree_nocheck(opl3->res_l_port);
@@ -362,51 +343,89 @@
 	return snd_opl3_free(opl3);
 }
 
-int snd_opl3_create(snd_card_t * card,
-		    unsigned long l_port,
-		    unsigned long r_port,
-		    unsigned short hardware,
-		    int integrated,
-		    opl3_t ** ropl3)
+int snd_opl3_new(snd_card_t *card,
+		 unsigned short hardware,
+		 opl3_t **ropl3)
 {
-	opl3_t *opl3;
-	int err;
 	static snd_device_ops_t ops = {
 		.dev_free = snd_opl3_dev_free,
 	};
+	opl3_t *opl3;
+	int err;
 
 	*ropl3 = NULL;
-
 	opl3 = kcalloc(1, sizeof(*opl3), GFP_KERNEL);
 	if (opl3 == NULL)
 		return -ENOMEM;
 
-	if (integrated)
-		goto __step1; /* ports are already reserved */
+	opl3->card = card;
+	opl3->hardware = hardware;
+	spin_lock_init(&opl3->reg_lock);
+	spin_lock_init(&opl3->timer_lock);
+	init_MUTEX(&opl3->access_mutex);
 
-	if ((opl3->res_l_port = request_region(l_port, 2, "OPL2/3 (left)")) == NULL) {
-		snd_printk(KERN_ERR "opl3: can't grab left port 0x%lx\n", l_port);
+	if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, opl3, &ops)) < 0) {
 		snd_opl3_free(opl3);
-		return -EBUSY;
+		return err;
 	}
-	if (r_port != 0 &&
-	    (opl3->res_r_port = request_region(r_port, 2, "OPL2/3 (right)")) == NULL) {
-		snd_printk(KERN_ERR "opl3: can't grab right port 0x%lx\n", r_port);
-		snd_opl3_free(opl3);
-		return -EBUSY;
+
+	*ropl3 = opl3;
+	return 0;
+}
+
+int snd_opl3_init(opl3_t *opl3)
+{
+	if (! opl3->command) {
+		printk(KERN_ERR "snd_opl3_init: command not defined!\n");
+		return -EINVAL;
 	}
 
-      __step1:
+	opl3->command(opl3, OPL3_LEFT | OPL3_REG_TEST, OPL3_ENABLE_WAVE_SELECT);
+	/* Melodic mode */
+	opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, 0x00);
 
-	opl3->card = card;
-	opl3->hardware = hardware;
+	switch (opl3->hardware & OPL3_HW_MASK) {
+	case OPL3_HW_OPL2:
+		opl3->max_voices = MAX_OPL2_VOICES;
+		break;
+	case OPL3_HW_OPL3:
+	case OPL3_HW_OPL4:
+		opl3->max_voices = MAX_OPL3_VOICES;
+		/* Enter OPL3 mode */
+		opl3->command(opl3, OPL3_RIGHT | OPL3_REG_MODE, OPL3_OPL3_ENABLE);
+	}
+	return 0;
+}
+
+int snd_opl3_create(snd_card_t * card,
+		    unsigned long l_port,
+		    unsigned long r_port,
+		    unsigned short hardware,
+		    int integrated,
+		    opl3_t ** ropl3)
+{
+	opl3_t *opl3;
+	int err;
+
+	*ropl3 = NULL;
+	if ((err = snd_opl3_new(card, hardware, &opl3)) < 0)
+		return err;
+	if (! integrated) {
+		if ((opl3->res_l_port = request_region(l_port, 2, "OPL2/3 (left)")) == NULL) {
+			snd_printk(KERN_ERR "opl3: can't grab left port 0x%lx\n", l_port);
+			snd_opl3_free(opl3);
+			return -EBUSY;
+		}
+		if (r_port != 0 &&
+		    (opl3->res_r_port = request_region(r_port, 2, "OPL2/3 (right)")) == NULL) {
+			snd_printk(KERN_ERR "opl3: can't grab right port 0x%lx\n", r_port);
+			snd_opl3_free(opl3);
+			return -EBUSY;
+		}
+	}
 	opl3->l_port = l_port;
 	opl3->r_port = r_port;
 
-	spin_lock_init(&opl3->reg_lock);
-	spin_lock_init(&opl3->timer_lock);
-	init_MUTEX(&opl3->access_mutex);
-
 	switch (opl3->hardware) {
 	/* some hardware doesn't support timers */
 	case OPL3_HW_OPL3_SV:
@@ -414,9 +433,6 @@
 	case OPL3_HW_OPL3_FM801:
 		opl3->command = &snd_opl3_command;
 		break;
-	case OPL3_HW_OPL3_CS4281:
-		opl3->command = &snd_opl3_cs4281_command;
-		break;
 	default:
 		opl3->command = &snd_opl2_command;
 		if ((err = snd_opl3_detect(opl3)) < 0) {
@@ -433,23 +449,7 @@
 		}
 	}
 
-	opl3->command(opl3, OPL3_LEFT | OPL3_REG_TEST, OPL3_ENABLE_WAVE_SELECT);
-	opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, 0x00);	/* Melodic mode */
-
-	switch (opl3->hardware & OPL3_HW_MASK) {
-	case OPL3_HW_OPL2:
-		opl3->max_voices = MAX_OPL2_VOICES;
-		break;
-	case OPL3_HW_OPL3:
-	case OPL3_HW_OPL4:
-		opl3->max_voices = MAX_OPL3_VOICES;
-		snd_assert(opl3->r_port != 0, snd_opl3_free(opl3); return -ENODEV);
-		opl3->command(opl3, OPL3_RIGHT | OPL3_REG_MODE, OPL3_OPL3_ENABLE);	/* Enter OPL3 mode */
-	}
-	if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, opl3, &ops)) < 0) {
-		snd_opl3_free(opl3);
-		return err;
-	}
+	snd_opl3_init(opl3);
 
 	*ropl3 = opl3;
 	return 0;
@@ -531,6 +531,8 @@
 }
 
 EXPORT_SYMBOL(snd_opl3_interrupt);
+EXPORT_SYMBOL(snd_opl3_new);
+EXPORT_SYMBOL(snd_opl3_init);
 EXPORT_SYMBOL(snd_opl3_create);
 EXPORT_SYMBOL(snd_opl3_timer_new);
 EXPORT_SYMBOL(snd_opl3_hwdep_new);
--- linux/sound/pci/cs4281.c	2004-09-16 19:35:30.000000000 +0200
+++ linux/sound/pci/cs4281.c	2004-09-30 18:30:29.000000000 +0200
@@ -1914,6 +1914,31 @@
 }
 
 
+/*
+ * OPL3 command
+ */
+static void snd_cs4281_opl3_command(opl3_t * opl3, unsigned short cmd, unsigned char val)
+{
+	unsigned long flags;
+	cs4281_t *chip = opl3->private_data;
+	void __iomem *port;
+
+	if (cmd & OPL3_RIGHT)
+		port = chip->ba0 + BA0_B1AP; /* right port */
+	else
+		port = chip->ba0 + BA0_B0AP; /* left port */
+
+	spin_lock_irqsave(&opl3->reg_lock, flags);
+
+	writel((unsigned int)cmd, port);
+	udelay(10);
+
+	writel((unsigned int)val, port + 4);
+	udelay(30);
+
+	spin_unlock_irqrestore(&opl3->reg_lock, flags);
+}
+
 static int __devinit snd_cs4281_probe(struct pci_dev *pci,
 				      const struct pci_device_id *pci_id)
 {
@@ -1951,13 +1976,13 @@
 		snd_card_free(card);
 		return err;
 	}
-	if ((err = snd_opl3_create(card,
-				   (unsigned long)(chip->ba0 + BA0_B0AP),
-				   (unsigned long)(chip->ba0 + BA0_B1AP),
-				   OPL3_HW_OPL3_CS4281, 1, &opl3)) < 0) {
+	if ((err = snd_opl3_new(card, OPL3_HW_OPL3_CS4281, &opl3)) < 0) {
 		snd_card_free(card);
 		return err;
 	}
+	opl3->private_data = chip;
+	opl3->command = snd_cs4281_opl3_command;
+	snd_opl3_init(opl3);
 	if ((err = snd_opl3_hwdep_new(opl3, 0, 1, NULL)) < 0) {
 		snd_card_free(card);
 		return err;
-
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