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ALSA: line6: Reorganize card resource handling 

This is a fairly big rewrite regarding the card resource management in
line6 drivers:

- The card creation is moved into line6_probe().  This adds the global
  destructor to private_free, so that each driver doesn't have to call
  it any longer.

- The USB disconnect callback handles the card release, thus each
  driver needs to concentrate on only its own resources.  No need to
  snd_card_*() call in the destructor.

- Fix the potential stall in disconnection by removing
  snd_card_free().   It's replaced with snd_card_free_when_closed()
  for asynchronous release.

- The only remaining operation for the card in each driver is the call
  of snd_card_register().  All the rest are dealt in the common module
  by itself.

- These ended up with removal of audio.[ch] as a result of a reduction
  of one layer.  Each driver just needs to call line6_probe().

Tested-by: Chris Rorvick <chris@rorvick.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2015-01-19 15:54:00 +01:00
parent 84ac9bb12e
commit 85a9339bec
12 changed files with 85 additions and 355 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
sound/usb/line6/Makefile
View File

@ -1,5 +1,4 @@
snd-usb-line6-y := \
audio.o \
capture.o \
driver.o \
midi.o \

74
sound/usb/line6/audio.c
View File

@ -1,74 +0,0 @@
/*
* Line6 Linux USB driver - 0.9.1beta
*
* Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, version 2.
*
*/
#include <sound/core.h>
#include <sound/initval.h>
#include <linux/export.h>
#include "driver.h"
#include "audio.h"
/*
Initialize the Line6 USB audio system.
*/
int line6_init_audio(struct usb_line6 *line6)
{
struct snd_card *card;
int err;
err = snd_card_new(line6->ifcdev,
SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
THIS_MODULE, 0, &card);
if (err < 0)
return err;
line6->card = card;
strcpy(card->id, line6->properties->id);
strcpy(card->driver, DRIVER_NAME);
strcpy(card->shortname, line6->properties->name);
/* longname is 80 chars - see asound.h */
sprintf(card->longname, "Line6 %s at USB %s", line6->properties->name,
dev_name(line6->ifcdev));
return 0;
}
EXPORT_SYMBOL_GPL(line6_init_audio);
/*
Register the Line6 USB audio system.
*/
int line6_register_audio(struct usb_line6 *line6)
{
int err;
err = snd_card_register(line6->card);
if (err < 0)
return err;
return 0;
}
EXPORT_SYMBOL_GPL(line6_register_audio);
/*
Cleanup the Line6 USB audio system.
*/
void line6_cleanup_audio(struct usb_line6 *line6)
{
struct snd_card *card = line6->card;
if (card == NULL)
return;
snd_card_disconnect(card);
snd_card_free(card);
line6->card = NULL;
}
EXPORT_SYMBOL_GPL(line6_cleanup_audio);

21
sound/usb/line6/audio.h
View File

@ -1,21 +0,0 @@
/*
* Line6 Linux USB driver - 0.9.1beta
*
* Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, version 2.
*
*/
#ifndef AUDIO_H
#define AUDIO_H
#include "driver.h"
extern void line6_cleanup_audio(struct usb_line6 *);
extern int line6_init_audio(struct usb_line6 *);
extern int line6_register_audio(struct usb_line6 *);
#endif

1
sound/usb/line6/capture.c
View File

@ -14,7 +14,6 @@
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include "audio.h"
#include "capture.h"
#include "driver.h"
#include "pcm.h"

82
sound/usb/line6/driver.c
View File

@ -15,7 +15,9 @@
#include <linux/slab.h>
#include <linux/usb.h>
#include "audio.h"
#include <sound/core.h>
#include <sound/initval.h>
#include "capture.h"
#include "driver.h"
#include "midi.h"
@ -481,17 +483,16 @@ ssize_t line6_nop_read(struct device *dev, struct device_attribute *attr,
EXPORT_SYMBOL_GPL(line6_nop_read);
/*
Generic destructor.
Card destructor.
*/
static void line6_destruct(struct usb_interface *interface)
static void line6_destruct(struct snd_card *card)
{
struct usb_line6 *line6;
struct usb_line6 *line6 = card->private_data;
struct usb_device *usbdev;
if (interface == NULL)
return;
line6 = usb_get_intfdata(interface);
if (line6 == NULL)
if (!line6)
return;
usbdev = line6->usbdev;
/* free buffer memory first: */
kfree(line6->buffer_message);
@ -500,8 +501,11 @@ static void line6_destruct(struct usb_interface *interface)
/* then free URBs: */
usb_free_urb(line6->urb_listen);
/* make sure the device isn't destructed twice: */
usb_set_intfdata(interface, NULL);
/* free interface data: */
kfree(line6);
/* decrement reference counters: */
usb_put_dev(usbdev);
}
/*
@ -513,6 +517,7 @@ int line6_probe(struct usb_interface *interface,
int (*private_init)(struct usb_interface *, struct usb_line6 *))
{
struct usb_device *usbdev;
struct snd_card *card;
int interface_number;
int ret;
@ -569,8 +574,26 @@ int line6_probe(struct usb_interface *interface,
}
}
ret = snd_card_new(line6->ifcdev,
SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
THIS_MODULE, 0, &card);
if (ret < 0)
goto err_put;
line6->card = card;
strcpy(card->id, line6->properties->id);
strcpy(card->driver, DRIVER_NAME);
strcpy(card->shortname, line6->properties->name);
sprintf(card->longname, "Line6 %s at USB %s", line6->properties->name,
dev_name(line6->ifcdev));
card->private_data = line6;
card->private_free = line6_destruct;
usb_set_intfdata(interface, line6);
/* increment reference counters: */
usb_get_dev(usbdev);
if (properties->capabilities & LINE6_CAP_CONTROL) {
/* initialize USB buffers: */
line6->buffer_listen =
@ -612,15 +635,11 @@ int line6_probe(struct usb_interface *interface,
dev_info(&interface->dev, "Line6 %s now attached\n",
line6->properties->name);
/* increment reference counters: */
usb_get_intf(interface);
usb_get_dev(usbdev);
return 0;
err_destruct:
line6_destruct(interface);
err_put:
err_destruct:
snd_card_free(card);
err_put:
return ret;
}
EXPORT_SYMBOL_GPL(line6_probe);
@ -642,29 +661,26 @@ void line6_disconnect(struct usb_interface *interface)
interface_number = interface->cur_altsetting->desc.bInterfaceNumber;
line6 = usb_get_intfdata(interface);
if (!line6)
return;
if (line6 != NULL) {
if (line6->urb_listen != NULL)
line6_stop_listen(line6);
if (line6->urb_listen != NULL)
line6_stop_listen(line6);
if (usbdev != line6->usbdev)
dev_err(line6->ifcdev,
"driver bug: inconsistent usb device\n");
if (usbdev != line6->usbdev)
dev_err(line6->ifcdev, "driver bug: inconsistent usb device\n");
snd_card_disconnect(line6->card);
if (line6->disconnect)
line6->disconnect(interface);
dev_info(&interface->dev, "Line6 %s now disconnected\n",
line6->properties->name);
}
dev_info(&interface->dev, "Line6 %s now disconnected\n",
line6->properties->name);
line6_destruct(interface);
/* make sure the device isn't destructed twice: */
usb_set_intfdata(interface, NULL);
/* free interface data: */
kfree(line6);
/* decrement reference counters: */
usb_put_intf(interface);
usb_put_dev(usbdev);
snd_card_free_when_closed(line6->card);
}
EXPORT_SYMBOL_GPL(line6_disconnect);

1
sound/usb/line6/midi.c
View File

@ -15,7 +15,6 @@
#include <sound/core.h>
#include <sound/rawmidi.h>
#include "audio.h"
#include "driver.h"
#include "midi.h"
#include "usbdefs.h"

1
sound/usb/line6/pcm.c
View File

@ -16,7 +16,6 @@
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include "audio.h"
#include "capture.h"
#include "driver.h"
#include "playback.h"

1
sound/usb/line6/playback.c
View File

@ -14,7 +14,6 @@
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include "audio.h"
#include "capture.h"
#include "driver.h"
#include "pcm.h"

60
sound/usb/line6/pod.c
View File

@ -18,7 +18,6 @@
#include <sound/core.h>
#include <sound/control.h>
#include "audio.h"
#include "capture.h"
#include "driver.h"
#include "playback.h"
@ -340,7 +339,7 @@ static void pod_startup4(struct work_struct *work)
line6_read_serial_number(&pod->line6, &pod->serial_number);
/* ALSA audio interface: */
line6_register_audio(line6);
snd_card_register(line6->card);
}
/* POD special files: */
@ -397,21 +396,6 @@ static struct snd_kcontrol_new pod_control_monitor = {
.put = snd_pod_control_monitor_put
};
/*
POD destructor.
*/
static void pod_destruct(struct usb_interface *interface)
{
struct usb_line6_pod *pod = usb_get_intfdata(interface);
if (pod == NULL)
return;
line6_cleanup_audio(&pod->line6);
del_timer(&pod->startup_timer);
cancel_work_sync(&pod->startup_work);
}
/*
POD device disconnected.
*/
@ -424,21 +408,18 @@ static void line6_pod_disconnect(struct usb_interface *interface)
pod = usb_get_intfdata(interface);
if (pod != NULL) {
struct snd_line6_pcm *line6pcm = pod->line6.line6pcm;
struct device *dev = &interface->dev;
if (line6pcm != NULL)
line6_pcm_disconnect(line6pcm);
if (dev != NULL) {
/* remove sysfs entries: */
device_remove_file(dev, &dev_attr_device_id);
device_remove_file(dev, &dev_attr_firmware_version);
device_remove_file(dev, &dev_attr_serial_number);
}
}
pod_destruct(interface);
del_timer_sync(&pod->startup_timer);
cancel_work_sync(&pod->startup_work);
}
}
/*
@ -457,8 +438,8 @@ static int pod_create_files2(struct device *dev)
/*
Try to init POD device.
*/
static int pod_try_init(struct usb_interface *interface,
struct usb_line6 *line6)
static int pod_init(struct usb_interface *interface,
struct usb_line6 *line6)
{
int err;
struct usb_line6_pod *pod = (struct usb_line6_pod *) line6;
@ -477,11 +458,6 @@ static int pod_try_init(struct usb_interface *interface,
if (err < 0)
return err;
/* initialize audio system: */
err = line6_init_audio(line6);
if (err < 0)
return err;
/* initialize MIDI subsystem: */
err = line6_init_midi(line6);
if (err < 0)
@ -514,20 +490,6 @@ static int pod_try_init(struct usb_interface *interface,
return 0;
}
/*
Init POD device (and clean up in case of failure).
*/
static int pod_init(struct usb_interface *interface,
struct usb_line6 *line6)
{
int err = pod_try_init(interface, line6);
if (err < 0)
pod_destruct(interface);
return err;
}
#define LINE6_DEVICE(prod) USB_DEVICE(0x0e41, prod)
#define LINE6_IF_NUM(prod, n) USB_DEVICE_INTERFACE_NUMBER(0x0e41, prod, n)
@ -636,17 +598,13 @@ static int pod_probe(struct usb_interface *interface,
const struct usb_device_id *id)
{
struct usb_line6_pod *pod;
int err;
pod = kzalloc(sizeof(*pod), GFP_KERNEL);
if (!pod)
return -ENODEV;
err = line6_probe(interface, &pod->line6,
&pod_properties_table[id->driver_info],
pod_init);
if (err < 0)
kfree(pod);
return err;
return line6_probe(interface, &pod->line6,
&pod_properties_table[id->driver_info],
pod_init);
}
static struct usb_driver pod_driver = {

75
sound/usb/line6/podhd.c
View File

@ -15,7 +15,6 @@
#include <sound/core.h>
#include <sound/pcm.h>
#include "audio.h"
#include "driver.h"
#include "pcm.h"
#include "usbdefs.h"
@ -85,58 +84,18 @@ static struct line6_pcm_properties podhd_pcm_properties = {
.bytes_per_frame = PODHD_BYTES_PER_FRAME
};
/*
POD HD destructor.
*/
static void podhd_destruct(struct usb_interface *interface)
{
struct usb_line6_podhd *podhd = usb_get_intfdata(interface);
if (podhd == NULL)
return;
line6_cleanup_audio(&podhd->line6);
}
/*
POD HD device disconnected.
*/
static void line6_podhd_disconnect(struct usb_interface *interface)
{
struct usb_line6_podhd *podhd;
if (interface == NULL)
return;
podhd = usb_get_intfdata(interface);
if (podhd != NULL) {
struct snd_line6_pcm *line6pcm = podhd->line6.line6pcm;
if (line6pcm != NULL)
line6_pcm_disconnect(line6pcm);
}
podhd_destruct(interface);
}
/*
Try to init POD HD device.
*/
static int podhd_try_init(struct usb_interface *interface,
struct usb_line6_podhd *podhd)
static int podhd_init(struct usb_interface *interface,
struct usb_line6 *line6)
{
struct usb_line6_podhd *podhd = (struct usb_line6_podhd *) line6;
int err;
struct usb_line6 *line6 = &podhd->line6;
if ((interface == NULL) || (podhd == NULL))
return -ENODEV;
line6->disconnect = line6_podhd_disconnect;
/* initialize audio system: */
err = line6_init_audio(line6);
if (err < 0)
return err;
/* initialize MIDI subsystem: */
err = line6_init_midi(line6);
if (err < 0)
@ -148,8 +107,7 @@ static int podhd_try_init(struct usb_interface *interface,
return err;
/* register USB audio system: */
err = line6_register_audio(line6);
return err;
return snd_card_register(line6->card);
}
#define LINE6_DEVICE(prod) USB_DEVICE(0x0e41, prod)
@ -217,21 +175,6 @@ static const struct line6_properties podhd_properties_table[] = {
},
};
/*
Init POD HD device (and clean up in case of failure).
*/
static int podhd_init(struct usb_interface *interface,
struct usb_line6 *line6)
{
struct usb_line6_podhd *podhd = (struct usb_line6_podhd *) line6;
int err = podhd_try_init(interface, podhd);
if (err < 0)
podhd_destruct(interface);
return err;
}
/*
Probe USB device.
*/
@ -239,17 +182,13 @@ static int podhd_probe(struct usb_interface *interface,
const struct usb_device_id *id)
{
struct usb_line6_podhd *podhd;
int err;
podhd = kzalloc(sizeof(*podhd), GFP_KERNEL);
if (!podhd)
return -ENODEV;
err = line6_probe(interface, &podhd->line6,
&podhd_properties_table[id->driver_info],
podhd_init);
if (err < 0)
kfree(podhd);
return err;
return line6_probe(interface, &podhd->line6,
&podhd_properties_table[id->driver_info],
podhd_init);
}
static struct usb_driver podhd_driver = {

65
sound/usb/line6/toneport.c
View File

@ -17,7 +17,6 @@
#include <sound/core.h>
#include <sound/control.h>
#include "audio.h"
#include "capture.h"
#include "driver.h"
#include "playback.h"
@ -330,18 +329,6 @@ static struct snd_kcontrol_new toneport_control_source = {
.put = snd_toneport_source_put
};
/*
Toneport destructor.
*/
static void toneport_destruct(struct usb_interface *interface)
{
struct usb_line6_toneport *toneport = usb_get_intfdata(interface);
if (toneport == NULL)
return;
line6_cleanup_audio(&toneport->line6);
}
/*
Setup Toneport device.
*/
@ -394,25 +381,14 @@ static void line6_toneport_disconnect(struct usb_interface *interface)
device_remove_file(&interface->dev, &dev_attr_led_red);
device_remove_file(&interface->dev, &dev_attr_led_green);
}
if (toneport != NULL) {
struct snd_line6_pcm *line6pcm = toneport->line6.line6pcm;
if (line6pcm != NULL) {
line6_pcm_release(line6pcm, LINE6_BITS_PCM_MONITOR);
line6_pcm_disconnect(line6pcm);
}
}
toneport_destruct(interface);
}
/*
Try to init Toneport device.
*/
static int toneport_try_init(struct usb_interface *interface,
struct usb_line6 *line6)
static int toneport_init(struct usb_interface *interface,
struct usb_line6 *line6)
{
int err;
struct usb_line6_toneport *toneport = (struct usb_line6_toneport *) line6;
@ -422,11 +398,6 @@ static int toneport_try_init(struct usb_interface *interface,
line6->disconnect = line6_toneport_disconnect;
/* initialize audio system: */
err = line6_init_audio(line6);
if (err < 0)
return err;
/* initialize PCM subsystem: */
err = line6_init_pcm(line6, &toneport_pcm_properties);
if (err < 0)
@ -456,11 +427,6 @@ static int toneport_try_init(struct usb_interface *interface,
break;
}
/* register audio system: */
err = line6_register_audio(line6);
if (err < 0)
return err;
line6_read_serial_number(line6, &toneport->serial_number);
line6_read_data(line6, 0x80c2, &toneport->firmware_version, 1);
@ -477,21 +443,8 @@ static int toneport_try_init(struct usb_interface *interface,
(unsigned long)toneport);
mod_timer(&toneport->timer, jiffies + TONEPORT_PCM_DELAY * HZ);
return 0;
}
/*
Init Toneport device (and clean up in case of failure).
*/
static int toneport_init(struct usb_interface *interface,
struct usb_line6 *line6)
{
int err = toneport_try_init(interface, line6);
if (err < 0)
toneport_destruct(interface);
return err;
/* register audio system: */
return snd_card_register(line6->card);
}
#ifdef CONFIG_PM
@ -595,18 +548,14 @@ static int toneport_probe(struct usb_interface *interface,
const struct usb_device_id *id)
{
struct usb_line6_toneport *toneport;
int err;
toneport = kzalloc(sizeof(*toneport), GFP_KERNEL);
if (!toneport)
return -ENODEV;
toneport->type = id->driver_info;
err = line6_probe(interface, &toneport->line6,
&toneport_properties_table[id->driver_info],
toneport_init);
if (err < 0)
kfree(toneport);
return err;
return line6_probe(interface, &toneport->line6,
&toneport_properties_table[id->driver_info],
toneport_init);
}
static struct usb_driver toneport_driver = {

58
sound/usb/line6/variax.c
View File

@ -16,7 +16,6 @@
#include <linux/module.h>
#include <sound/core.h>
#include "audio.h"
#include "driver.h"
#include "usbdefs.h"
@ -179,7 +178,7 @@ static void variax_startup6(struct work_struct *work)
CHECK_STARTUP_PROGRESS(variax->startup_progress, VARIAX_STARTUP_SETUP);
/* ALSA audio interface: */
line6_register_audio(&variax->line6);
snd_card_register(variax->line6.card);
}
/*
@ -211,13 +210,16 @@ static void line6_variax_process_message(struct usb_line6 *line6)
/*
Variax destructor.
*/
static void variax_destruct(struct usb_interface *interface)
static void line6_variax_disconnect(struct usb_interface *interface)
{
struct usb_line6_variax *variax = usb_get_intfdata(interface);
struct usb_line6_variax *variax;
if (variax == NULL)
if (!interface)
return;
variax = usb_get_intfdata(interface);
if (!variax)
return;
line6_cleanup_audio(&variax->line6);
del_timer(&variax->startup_timer1);
del_timer(&variax->startup_timer2);
@ -226,22 +228,11 @@ static void variax_destruct(struct usb_interface *interface)
kfree(variax->buffer_activate);
}
/*
Workbench device disconnected.
*/
static void line6_variax_disconnect(struct usb_interface *interface)
{
if (interface == NULL)
return;
variax_destruct(interface);
}
/*
Try to init workbench device.
*/
static int variax_try_init(struct usb_interface *interface,
struct usb_line6 *line6)
static int variax_init(struct usb_interface *interface,
struct usb_line6 *line6)
{
struct usb_line6_variax *variax = (struct usb_line6_variax *) line6;
int err;
@ -263,11 +254,6 @@ static int variax_try_init(struct usb_interface *interface,
if (variax->buffer_activate == NULL)
return -ENOMEM;
/* initialize audio system: */
err = line6_init_audio(&variax->line6);
if (err < 0)
return err;
/* initialize MIDI subsystem: */
err = line6_init_midi(&variax->line6);
if (err < 0)
@ -278,20 +264,6 @@ static int variax_try_init(struct usb_interface *interface,
return 0;
}
/*
Init workbench device (and clean up in case of failure).
*/
static int variax_init(struct usb_interface *interface,
struct usb_line6 *line6)
{
int err = variax_try_init(interface, line6);
if (err < 0)
variax_destruct(interface);
return err;
}
#define LINE6_DEVICE(prod) USB_DEVICE(0x0e41, prod)
#define LINE6_IF_NUM(prod, n) USB_DEVICE_INTERFACE_NUMBER(0x0e41, prod, n)
@ -335,17 +307,13 @@ static int variax_probe(struct usb_interface *interface,
const struct usb_device_id *id)
{
struct usb_line6_variax *variax;
int err;
variax = kzalloc(sizeof(*variax), GFP_KERNEL);
if (!variax)
return -ENODEV;
err = line6_probe(interface, &variax->line6,
&variax_properties_table[id->driver_info],
variax_init);
if (err < 0)
kfree(variax);
return err;
return line6_probe(interface, &variax->line6,
&variax_properties_table[id->driver_info],
variax_init);
}
static struct usb_driver variax_driver = {