[ALSA] mtpav - Use platform_device

Modules: Generic drivers

Rewrite the probe/remove code using platform_device.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 129 insertions, 139 deletions

diff --git a/sound/drivers/mtpav.c b/sound/drivers/mtpav.c
index d32d5f6eee39..d9c4e224fa5f 100644
--- a/sound/drivers/mtpav.c
+++ b/sound/drivers/mtpav.c
@@ -53,6 +53,8 @@
 #include <sound/driver.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/ioport.h>
 #include <linux/moduleparam.h>
@@ -125,16 +127,16 @@ MODULE_PARM_DESC(hwports, "Hardware ports # for MotuMTPAV MIDI.");
 /*
  */
 
-typedef struct mtpav_port {
+struct mtpav_port {
         u8 number;
         u8 hwport;
         u8 mode;
         u8 running_status;
         struct snd_rawmidi_substream *input;
         struct snd_rawmidi_substream *output;
-} mtpav_port_t;
+};
 
-typedef struct mtpav {
+struct mtpav {
         struct snd_card *card;
         unsigned long port;
         struct resource *res_port;
@@ -145,22 +147,16 @@ typedef struct mtpav {
         struct timer_list timer;        /* timer interrupts for outputs */
         struct snd_rawmidi *rmidi;
         int num_ports;          /* number of hw ports (1-8) */
-        mtpav_port_t ports[NUMPORTS];   /* all ports including computer, adat and bc */
+        struct mtpav_port ports[NUMPORTS];      /* all ports including computer, adat and bc */
 
         u32 inmidiport;         /* selected input midi port */
         u32 inmidistate;        /* during midi command 0xf5 */
 
         u32 outmidihwport;      /* selected output midi hw port */
-} mtpav_t;
+};
 
 
 /*
- * global instance
- * hey, we handle at most only one card..
- */
-static mtpav_t *mtp_card;
-
-/*
  * possible hardware ports (selected by 0xf5 port message)
  *      0x00            all ports
  *      0x01 .. 0x08    this MTP's ports 1..8
@@ -183,7 +179,7 @@ static mtpav_t *mtp_card;
 #define MTPAV_PIDX_BROADCAST    2
 
 
-static int translate_subdevice_to_hwport(mtpav_t *chip, int subdev)
+static int translate_subdevice_to_hwport(struct mtpav *chip, int subdev)
 {
         if (subdev < 0)
                 return 0x01; /* invalid - use port 0 as default */
@@ -198,7 +194,7 @@ static int translate_subdevice_to_hwport(mtpav_t *chip, int subdev)
         return 0; /* all ports */
 }
 
-static int translate_hwport_to_subdevice(mtpav_t *chip, int hwport)
+static int translate_hwport_to_subdevice(struct mtpav *chip, int hwport)
 {
         int p;
         if (hwport <= 0x00) /* all ports */
@@ -223,7 +219,7 @@ static int translate_hwport_to_subdevice(mtpav_t *chip, int hwport)
 /*
  */
 
-static u8 snd_mtpav_getreg(mtpav_t *chip, u16 reg)
+static u8 snd_mtpav_getreg(struct mtpav *chip, u16 reg)
 {
         u8 rval = 0;
 
@@ -241,19 +237,16 @@ static u8 snd_mtpav_getreg(mtpav_t *chip, u16 reg)
 /*
  */
 
-static void snd_mtpav_mputreg(mtpav_t *chip, u16 reg, u8 val)
+static inline void snd_mtpav_mputreg(struct mtpav *chip, u16 reg, u8 val)
 {
-        if (reg == DREG) {
-                outb(val, chip->port + DREG);
-        } else if (reg == CREG) {
-                outb(val, chip->port + CREG);
-        }
+        if (reg == DREG || reg == CREG)
+                outb(val, chip->port + reg);
 }
 
 /*
  */
 
-static void snd_mtpav_wait_rfdhi(mtpav_t *chip)
+static void snd_mtpav_wait_rfdhi(struct mtpav *chip)
 {
         int counts = 10000;
         u8 sbyte;
@@ -265,7 +258,7 @@ static void snd_mtpav_wait_rfdhi(mtpav_t *chip)
         }
 }
 
-static void snd_mtpav_send_byte(mtpav_t *chip, u8 byte)
+static void snd_mtpav_send_byte(struct mtpav *chip, u8 byte)
 {
         u8 tcbyt;
         u8 clrwrite;
@@ -291,7 +284,8 @@ static void snd_mtpav_send_byte(mtpav_t *chip, u8 byte)
  */
 
 /* call this with spin lock held */
-static void snd_mtpav_output_port_write(mtpav_port_t *port,
+static void snd_mtpav_output_port_write(struct mtpav *mtp_card,
+                                        struct mtpav_port *portp,
                                         struct snd_rawmidi_substream *substream)
 {
         u8 outbyte;
@@ -303,22 +297,22 @@ static void snd_mtpav_output_port_write(mtpav_port_t *port,
 
         // send port change command if necessary
 
-        if (port->hwport != mtp_card->outmidihwport) {
-                mtp_card->outmidihwport = port->hwport;
+        if (portp->hwport != mtp_card->outmidihwport) {
+                mtp_card->outmidihwport = portp->hwport;
 
                 snd_mtpav_send_byte(mtp_card, 0xf5);
-                snd_mtpav_send_byte(mtp_card, port->hwport);
-                //snd_printk("new outport: 0x%x\n", (unsigned int) port->hwport);
+                snd_mtpav_send_byte(mtp_card, portp->hwport);
+                //snd_printk("new outport: 0x%x\n", (unsigned int) portp->hwport);
 
-                if (!(outbyte & 0x80) && port->running_status)
-                        snd_mtpav_send_byte(mtp_card, port->running_status);
+                if (!(outbyte & 0x80) && portp->running_status)
+                        snd_mtpav_send_byte(mtp_card, portp->running_status);
         }
 
         // send data
 
         do {
                 if (outbyte & 0x80)
-                        port->running_status = outbyte;
+                        portp->running_status = outbyte;
                 
                 snd_mtpav_send_byte(mtp_card, outbyte);
         } while (snd_rawmidi_transmit(substream, &outbyte, 1) == 1);
@@ -326,11 +320,12 @@ static void snd_mtpav_output_port_write(mtpav_port_t *port,
 
 static void snd_mtpav_output_write(struct snd_rawmidi_substream *substream)
 {
-        mtpav_port_t *port = &mtp_card->ports[substream->number];
+        struct mtpav *mtp_card = substream->rmidi->private_data;
+        struct mtpav_port *portp = &mtp_card->ports[substream->number];
         unsigned long flags;
 
         spin_lock_irqsave(&mtp_card->spinlock, flags);
-        snd_mtpav_output_port_write(port, substream);
+        snd_mtpav_output_port_write(mtp_card, portp, substream);
         spin_unlock_irqrestore(&mtp_card->spinlock, flags);
 }
 
@@ -339,7 +334,7 @@ static void snd_mtpav_output_write(struct snd_rawmidi_substream *substream)
  *      mtpav control
  */
 
-static void snd_mtpav_portscan(mtpav_t *chip)   // put mtp into smart routing mode
+static void snd_mtpav_portscan(struct mtpav *chip)      // put mtp into smart routing mode
 {
         u8 p;
 
@@ -355,10 +350,10 @@ static void snd_mtpav_portscan(mtpav_t *chip)	// put mtp into smart routing mode
 
 static int snd_mtpav_input_open(struct snd_rawmidi_substream *substream)
 {
+        struct mtpav *mtp_card = substream->rmidi->private_data;
+        struct mtpav_port *portp = &mtp_card->ports[substream->number];
         unsigned long flags;
-        mtpav_port_t *portp = &mtp_card->ports[substream->number];
 
-        //printk("mtpav port: %d opened\n", (int) substream->number);
         spin_lock_irqsave(&mtp_card->spinlock, flags);
         portp->mode |= MTPAV_MODE_INPUT_OPENED;
         portp->input = substream;
@@ -373,18 +368,15 @@ static int snd_mtpav_input_open(struct snd_rawmidi_substream *substream)
 
 static int snd_mtpav_input_close(struct snd_rawmidi_substream *substream)
 {
+        struct mtpav *mtp_card = substream->rmidi->private_data;
+        struct mtpav_port *portp = &mtp_card->ports[substream->number];
         unsigned long flags;
-        mtpav_port_t *portp = &mtp_card->ports[substream->number];
-
-        //printk("mtpav port: %d closed\n", (int) portp);
 
         spin_lock_irqsave(&mtp_card->spinlock, flags);
-
-        portp->mode &= (~MTPAV_MODE_INPUT_OPENED);
+        portp->mode &= ~MTPAV_MODE_INPUT_OPENED;
         portp->input = NULL;
         if (--mtp_card->share_irq == 0)
                 snd_mtpav_mputreg(mtp_card, CREG, 0);   // disable pport interrupts
-
         spin_unlock_irqrestore(&mtp_card->spinlock, flags);
         return 0;
 }
@@ -394,8 +386,9 @@ static int snd_mtpav_input_close(struct snd_rawmidi_substream *substream)
 
 static void snd_mtpav_input_trigger(struct snd_rawmidi_substream *substream, int up)
 {
+        struct mtpav *mtp_card = substream->rmidi->private_data;
+        struct mtpav_port *portp = &mtp_card->ports[substream->number];
         unsigned long flags;
-        mtpav_port_t *portp = &mtp_card->ports[substream->number];
 
         spin_lock_irqsave(&mtp_card->spinlock, flags);
         if (up)
@@ -414,7 +407,7 @@ static void snd_mtpav_input_trigger(struct snd_rawmidi_substream *substream, int
 static void snd_mtpav_output_timer(unsigned long data)
 {
         unsigned long flags;
-        mtpav_t *chip = (mtpav_t *)data;
+        struct mtpav *chip = (struct mtpav *)data;
         int p;
 
         spin_lock_irqsave(&chip->spinlock, flags);
@@ -423,25 +416,22 @@ static void snd_mtpav_output_timer(unsigned long data)
         add_timer(&chip->timer);
         /* process each port */
         for (p = 0; p <= chip->num_ports * 2 + MTPAV_PIDX_BROADCAST; p++) {
-                mtpav_port_t *portp = &mtp_card->ports[p];
+                struct mtpav_port *portp = &chip->ports[p];
                 if ((portp->mode & MTPAV_MODE_OUTPUT_TRIGGERED) && portp->output)
-                        snd_mtpav_output_port_write(portp, portp->output);
+                        snd_mtpav_output_port_write(chip, portp, portp->output);
         }
         spin_unlock_irqrestore(&chip->spinlock, flags);
 }
 
 /* spinlock held! */
-static void snd_mtpav_add_output_timer(mtpav_t *chip)
+static void snd_mtpav_add_output_timer(struct mtpav *chip)
 {
-        init_timer(&chip->timer);
-        chip->timer.function = snd_mtpav_output_timer;
-        chip->timer.data = (unsigned long) mtp_card;
         chip->timer.expires = 1 + jiffies;
         add_timer(&chip->timer);
 }
 
 /* spinlock held! */
-static void snd_mtpav_remove_output_timer(mtpav_t *chip)
+static void snd_mtpav_remove_output_timer(struct mtpav *chip)
 {
         del_timer(&chip->timer);
 }
@@ -451,8 +441,9 @@ static void snd_mtpav_remove_output_timer(mtpav_t *chip)
 
 static int snd_mtpav_output_open(struct snd_rawmidi_substream *substream)
 {
+        struct mtpav *mtp_card = substream->rmidi->private_data;
+        struct mtpav_port *portp = &mtp_card->ports[substream->number];
         unsigned long flags;
-        mtpav_port_t *portp = &mtp_card->ports[substream->number];
 
         spin_lock_irqsave(&mtp_card->spinlock, flags);
         portp->mode |= MTPAV_MODE_OUTPUT_OPENED;
@@ -466,11 +457,12 @@ static int snd_mtpav_output_open(struct snd_rawmidi_substream *substream)
 
 static int snd_mtpav_output_close(struct snd_rawmidi_substream *substream)
 {
+        struct mtpav *mtp_card = substream->rmidi->private_data;
+        struct mtpav_port *portp = &mtp_card->ports[substream->number];
         unsigned long flags;
-        mtpav_port_t *portp = &mtp_card->ports[substream->number];
 
         spin_lock_irqsave(&mtp_card->spinlock, flags);
-        portp->mode &= (~MTPAV_MODE_OUTPUT_OPENED);
+        portp->mode &= ~MTPAV_MODE_OUTPUT_OPENED;
         portp->output = NULL;
         spin_unlock_irqrestore(&mtp_card->spinlock, flags);
         return 0;
@@ -481,12 +473,13 @@ static int snd_mtpav_output_close(struct snd_rawmidi_substream *substream)
 
 static void snd_mtpav_output_trigger(struct snd_rawmidi_substream *substream, int up)
 {
+        struct mtpav *mtp_card = substream->rmidi->private_data;
+        struct mtpav_port *portp = &mtp_card->ports[substream->number];
         unsigned long flags;
-        mtpav_port_t *portp = &mtp_card->ports[substream->number];
 
         spin_lock_irqsave(&mtp_card->spinlock, flags);
         if (up) {
-                if (! (portp->mode  & MTPAV_MODE_OUTPUT_TRIGGERED)) {
+                if (! (portp->mode & MTPAV_MODE_OUTPUT_TRIGGERED)) {
                         if (mtp_card->istimer++ == 0)
                                 snd_mtpav_add_output_timer(mtp_card);
                         portp->mode |= MTPAV_MODE_OUTPUT_TRIGGERED;
@@ -506,23 +499,20 @@ static void snd_mtpav_output_trigger(struct snd_rawmidi_substream *substream, in
  * midi interrupt for inputs
  */
 
-static void snd_mtpav_inmidi_process(mtpav_t *mcrd, u8 inbyte)
+static void snd_mtpav_inmidi_process(struct mtpav *mcrd, u8 inbyte)
 {
-        mtpav_port_t *portp;
+        struct mtpav_port *portp;
 
         if ((int)mcrd->inmidiport > mcrd->num_ports * 2 + MTPAV_PIDX_BROADCAST)
                 return;
 
         portp = &mcrd->ports[mcrd->inmidiport];
-        if (portp->mode & MTPAV_MODE_INPUT_TRIGGERED) {
+        if (portp->mode & MTPAV_MODE_INPUT_TRIGGERED)
                 snd_rawmidi_receive(portp->input, &inbyte, 1);
-        }
 }
 
-static void snd_mtpav_inmidi_h(mtpav_t * mcrd, u8 inbyte)
+static void snd_mtpav_inmidi_h(struct mtpav *mcrd, u8 inbyte)
 {
-        snd_assert(mcrd, return);
-
         if (inbyte >= 0xf8) {
                 /* real-time midi code */
                 snd_mtpav_inmidi_process(mcrd, inbyte);
@@ -540,7 +530,7 @@ static void snd_mtpav_inmidi_h(mtpav_t * mcrd, u8 inbyte)
         }
 }
 
-static void snd_mtpav_read_bytes(mtpav_t * mcrd)
+static void snd_mtpav_read_bytes(struct mtpav *mcrd)
 {
         u8 clrread, setread;
         u8 mtp_read_byte;
@@ -580,9 +570,8 @@ static void snd_mtpav_read_bytes(mtpav_t * mcrd)
 
 static irqreturn_t snd_mtpav_irqh(int irq, void *dev_id, struct pt_regs *regs)
 {
-        mtpav_t *mcard = dev_id;
+        struct mtpav *mcard = dev_id;
 
-        //printk("irqh()\n");
         spin_lock(&mcard->spinlock);
         snd_mtpav_read_bytes(mcard);
         spin_unlock(&mcard->spinlock);
@@ -592,14 +581,14 @@ static irqreturn_t snd_mtpav_irqh(int irq, void *dev_id, struct pt_regs *regs)
 /*
  * get ISA resources
  */
-static int snd_mtpav_get_ISA(mtpav_t * mcard)
+static int __init snd_mtpav_get_ISA(struct mtpav * mcard)
 {
         if ((mcard->res_port = request_region(port, 3, "MotuMTPAV MIDI")) == NULL) {
                 snd_printk("MTVAP port 0x%lx is busy\n", port);
                 return -EBUSY;
         }
         mcard->port = port;
-        if (request_irq(irq, snd_mtpav_irqh, SA_INTERRUPT, "MOTU MTPAV", (void *)mcard)) {
+        if (request_irq(irq, snd_mtpav_irqh, SA_INTERRUPT, "MOTU MTPAV", mcard)) {
                 snd_printk("MTVAP IRQ %d busy\n", irq);
                 return -EBUSY;
         }
@@ -628,7 +617,8 @@ static struct snd_rawmidi_ops snd_mtpav_input = {
  * get RAWMIDI resources
  */
 
-static void snd_mtpav_set_name(mtpav_t *chip, struct snd_rawmidi_substream *substream)
+static void __init snd_mtpav_set_name(struct mtpav *chip,
+                                      struct snd_rawmidi_substream *substream)
 {
         if (substream->number >= 0 && substream->number < chip->num_ports)
                 sprintf(substream->name, "MTP direct %d", (substream->number % chip->num_ports) + 1);
@@ -642,21 +632,18 @@ static void snd_mtpav_set_name(mtpav_t *chip, struct snd_rawmidi_substream *subs
                 strcpy(substream->name, "MTP broadcast");
 }
 
-static int snd_mtpav_get_RAWMIDI(mtpav_t * mcard)
+static int __init snd_mtpav_get_RAWMIDI(struct mtpav *mcard)
 {
-        int rval = 0;
+        int rval;
         struct snd_rawmidi *rawmidi;
         struct snd_rawmidi_substream *substream;
         struct list_head *list;
 
-        //printk("entering snd_mtpav_get_RAWMIDI\n");
-
         if (hwports < 1)
-                mcard->num_ports = 1;
+                hwports = 1;
         else if (hwports > 8)
-                mcard->num_ports = 8;
-        else
-                mcard->num_ports = hwports;
+                hwports = 8;
+        mcard->num_ports = hwports;
 
         if ((rval = snd_rawmidi_new(mcard->card, "MotuMIDI", 0,
                                     mcard->num_ports * 2 + MTPAV_PIDX_BROADCAST + 1,
@@ -664,6 +651,7 @@ static int snd_mtpav_get_RAWMIDI(mtpav_t * mcard)
                                     &mcard->rmidi)) < 0)
                 return rval;
         rawmidi = mcard->rmidi;
+        rawmidi->private_data = mcard;
 
         list_for_each(list, &rawmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) {
                 substream = list_entry(list, struct snd_rawmidi_substream, list);
@@ -679,36 +667,15 @@ static int snd_mtpav_get_RAWMIDI(mtpav_t * mcard)
         rawmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT | SNDRV_RAWMIDI_INFO_INPUT |
                                SNDRV_RAWMIDI_INFO_DUPLEX;
         sprintf(rawmidi->name, "MTP AV MIDI");
-        //printk("exiting snd_mtpav_get_RAWMIDI() \n");
         return 0;
 }
 
 /*
  */
 
-static mtpav_t *new_mtpav(void)
-{
-        mtpav_t *ncrd = kzalloc(sizeof(*ncrd), GFP_KERNEL);
-        if (ncrd != NULL) {
-                spin_lock_init(&ncrd->spinlock);
-
-                init_timer(&ncrd->timer);
-                ncrd->card = NULL;
-                ncrd->irq = -1;
-                ncrd->share_irq = 0;
-
-                ncrd->inmidiport = 0xffffffff;
-                ncrd->inmidistate = 0;
-                ncrd->outmidihwport = 0xffffffff;
-        }
-        return ncrd;
-}
-
-/*
- */
-
-static void free_mtpav(mtpav_t * crd)
+static void snd_mtpav_free(struct snd_card *card)
 {
+        struct mtpav *crd = card->private_data;
         unsigned long flags;
 
         spin_lock_irqsave(&crd->spinlock, flags);
@@ -718,78 +685,101 @@ static void free_mtpav(mtpav_t * crd)
         if (crd->irq >= 0)
                 free_irq(crd->irq, (void *)crd);
         release_and_free_resource(crd->res_port);
-        kfree(crd);
 }
 
 /*
  */
-
-static int __init alsa_card_mtpav_init(void)
+static int __init snd_mtpav_probe(struct platform_device *dev)
 {
-        int err = 0;
-        char longname_buffer[80];
+        struct snd_card *card;
+        int err;
+        struct mtpav *mtp_card;
 
-        mtp_card = new_mtpav();
-        if (mtp_card == NULL)
+        card = snd_card_new(index, id, THIS_MODULE, sizeof(*mtp_card));
+        if (! card)
                 return -ENOMEM;
 
-        mtp_card->card = snd_card_new(index, id, THIS_MODULE, 0);
-        if (mtp_card->card == NULL) {
-                free_mtpav(mtp_card);
-                return -ENOMEM;
-        }
+        mtp_card = card->private_data;
+        spin_lock_init(&mtp_card->spinlock);
+        init_timer(&mtp_card->timer);
+        mtp_card->card = card;
+        mtp_card->irq = -1;
+        mtp_card->share_irq = 0;
+        mtp_card->inmidiport = 0xffffffff;
+        mtp_card->inmidistate = 0;
+        mtp_card->outmidihwport = 0xffffffff;
+        init_timer(&mtp_card->timer);
+        mtp_card->timer.function = snd_mtpav_output_timer;
+        mtp_card->timer.data = (unsigned long) mtp_card;
+
+        card->private_free = snd_mtpav_free;
 
         err = snd_mtpav_get_ISA(mtp_card);
-        //printk("snd_mtpav_get_ISA returned: %d\n", err);
         if (err < 0)
                 goto __error;
 
-        strcpy(mtp_card->card->driver, "MTPAV");
-        strcpy(mtp_card->card->shortname, "MTPAV on parallel port");
-        memset(longname_buffer, 0, sizeof(longname_buffer));
-        sprintf(longname_buffer, "MTPAV on parallel port at");
+        strcpy(card->driver, "MTPAV");
+        strcpy(card->shortname, "MTPAV on parallel port");
+        snprintf(card->longname, sizeof(card->longname),
+                 "MTPAV on parallel port at 0x%lx", port);
 
         err = snd_mtpav_get_RAWMIDI(mtp_card);
-        //snd_printk("snd_mtapv_get_RAWMIDI returned: %d\n", err);
         if (err < 0)
                 goto __error;
 
-        if ((err = snd_card_set_generic_dev(mtp_card->card)) < 0)
-                goto __error;
-
-        err = snd_card_register(mtp_card->card);        // don't snd_card_register until AFTER all cards reources done!
+        snd_mtpav_portscan(mtp_card);
 
-        //printk("snd_card_register returned %d\n", err);
+        snd_card_set_dev(card, &dev->dev);
+        err = snd_card_register(mtp_card->card);
         if (err < 0)
                 goto __error;
 
-
-        snd_mtpav_portscan(mtp_card);
-
+        platform_set_drvdata(dev, card);
         printk(KERN_INFO "Motu MidiTimePiece on parallel port irq: %d ioport: 0x%lx\n", irq, port);
-
         return 0;
 
-      __error:
-        snd_card_free(mtp_card->card);
-        free_mtpav(mtp_card);
+ __error:
+        snd_card_free(card);
         return err;
 }
 
-/*
- */
+static int snd_mtpav_remove(struct platform_device *devptr)
+{
+        snd_card_free(platform_get_drvdata(devptr));
+        platform_set_drvdata(devptr, NULL);
+        return 0;
+}
 
-static void __exit alsa_card_mtpav_exit(void)
+#define SND_MTPAV_DRIVER        "snd_mtpav"
+
+static struct platform_driver snd_mtpav_driver = {
+        .probe          = snd_mtpav_probe,
+        .remove         = snd_mtpav_remove,
+        .driver         = {
+                .name   = SND_MTPAV_DRIVER
+        },
+};
+
+static int __init alsa_card_mtpav_init(void)
 {
-        if (mtp_card == NULL)
-                return;
-        if (mtp_card->card)
-                snd_card_free(mtp_card->card);
-        free_mtpav(mtp_card);
+        int err;
+        struct platform_device *device;
+
+        if ((err = platform_driver_register(&snd_mtpav_driver)) < 0)
+                return err;
+
+        device = platform_device_register_simple(SND_MTPAV_DRIVER, -1, NULL, 0);
+        if (IS_ERR(device)) {
+                platform_driver_unregister(&snd_mtpav_driver);
+                return PTR_ERR(device);
+        }
+        return 0;
 }
 
-/*
- */
+static void __exit alsa_card_mtpav_exit(void)
+{
+        platform_driver_unregister(&snd_mtpav_driver);
+}
 
 module_init(alsa_card_mtpav_init)
 module_exit(alsa_card_mtpav_exit)