32b8544296
The recent change in sysfs triggered a kernel WARNING at unloading a sound driver like WARNING: CPU: 3 PID: 2247 at fs/sysfs/group.c:214 sysfs_remove_group+0xe8/0xf0() sysfs group ffffffff81ab7b20 not found for kobject 'event14' for each jack instance. It's because the unregistration of jack input device is done in dev_free callback, which is called after snd_card_disconnect(). Since device_unregister(card->card_dev) is called in snd_card_disconnect(), the whole sysfs entries belonging to card->card_dev have been already removed recursively. Thus this results in a warning as input_unregister_device() yet tries to unregister the already removed sysfs entry. For fixing this mess, we need to unregister the jack input device at dev_disconnect callback so that it's called before unregistering the card->card_dev. Reviwed-by: Mark Brown <broonie@linaro.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
260 lines
6.6 KiB
C
260 lines
6.6 KiB
C
/*
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* Jack abstraction layer
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*
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* Copyright 2008 Wolfson Microelectronics
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/input.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <sound/jack.h>
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#include <sound/core.h>
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static int jack_switch_types[SND_JACK_SWITCH_TYPES] = {
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SW_HEADPHONE_INSERT,
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SW_MICROPHONE_INSERT,
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SW_LINEOUT_INSERT,
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SW_JACK_PHYSICAL_INSERT,
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SW_VIDEOOUT_INSERT,
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SW_LINEIN_INSERT,
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};
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static int snd_jack_dev_disconnect(struct snd_device *device)
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{
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struct snd_jack *jack = device->device_data;
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if (!jack->input_dev)
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return 0;
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/* If the input device is registered with the input subsystem
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* then we need to use a different deallocator. */
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if (jack->registered)
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input_unregister_device(jack->input_dev);
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else
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input_free_device(jack->input_dev);
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jack->input_dev = NULL;
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return 0;
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}
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static int snd_jack_dev_free(struct snd_device *device)
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{
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struct snd_jack *jack = device->device_data;
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if (jack->private_free)
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jack->private_free(jack);
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snd_jack_dev_disconnect(device);
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kfree(jack->id);
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kfree(jack);
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return 0;
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}
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static int snd_jack_dev_register(struct snd_device *device)
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{
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struct snd_jack *jack = device->device_data;
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struct snd_card *card = device->card;
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int err, i;
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snprintf(jack->name, sizeof(jack->name), "%s %s",
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card->shortname, jack->id);
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jack->input_dev->name = jack->name;
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/* Default to the sound card device. */
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if (!jack->input_dev->dev.parent)
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jack->input_dev->dev.parent = snd_card_get_device_link(card);
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/* Add capabilities for any keys that are enabled */
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for (i = 0; i < ARRAY_SIZE(jack->key); i++) {
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int testbit = SND_JACK_BTN_0 >> i;
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if (!(jack->type & testbit))
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continue;
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if (!jack->key[i])
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jack->key[i] = BTN_0 + i;
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input_set_capability(jack->input_dev, EV_KEY, jack->key[i]);
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}
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err = input_register_device(jack->input_dev);
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if (err == 0)
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jack->registered = 1;
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return err;
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}
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/**
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* snd_jack_new - Create a new jack
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* @card: the card instance
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* @id: an identifying string for this jack
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* @type: a bitmask of enum snd_jack_type values that can be detected by
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* this jack
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* @jjack: Used to provide the allocated jack object to the caller.
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*
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* Creates a new jack object.
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*
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* Return: Zero if successful, or a negative error code on failure.
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* On success @jjack will be initialised.
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*/
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int snd_jack_new(struct snd_card *card, const char *id, int type,
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struct snd_jack **jjack)
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{
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struct snd_jack *jack;
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int err;
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int i;
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static struct snd_device_ops ops = {
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.dev_free = snd_jack_dev_free,
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.dev_register = snd_jack_dev_register,
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.dev_disconnect = snd_jack_dev_disconnect,
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};
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jack = kzalloc(sizeof(struct snd_jack), GFP_KERNEL);
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if (jack == NULL)
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return -ENOMEM;
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jack->id = kstrdup(id, GFP_KERNEL);
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jack->input_dev = input_allocate_device();
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if (jack->input_dev == NULL) {
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err = -ENOMEM;
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goto fail_input;
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}
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jack->input_dev->phys = "ALSA";
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jack->type = type;
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for (i = 0; i < SND_JACK_SWITCH_TYPES; i++)
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if (type & (1 << i))
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input_set_capability(jack->input_dev, EV_SW,
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jack_switch_types[i]);
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err = snd_device_new(card, SNDRV_DEV_JACK, jack, &ops);
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if (err < 0)
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goto fail_input;
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*jjack = jack;
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return 0;
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fail_input:
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input_free_device(jack->input_dev);
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kfree(jack->id);
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kfree(jack);
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return err;
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}
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EXPORT_SYMBOL(snd_jack_new);
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/**
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* snd_jack_set_parent - Set the parent device for a jack
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*
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* @jack: The jack to configure
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* @parent: The device to set as parent for the jack.
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*
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* Set the parent for the jack devices in the device tree. This
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* function is only valid prior to registration of the jack. If no
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* parent is configured then the parent device will be the sound card.
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*/
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void snd_jack_set_parent(struct snd_jack *jack, struct device *parent)
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{
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WARN_ON(jack->registered);
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jack->input_dev->dev.parent = parent;
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}
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EXPORT_SYMBOL(snd_jack_set_parent);
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/**
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* snd_jack_set_key - Set a key mapping on a jack
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*
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* @jack: The jack to configure
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* @type: Jack report type for this key
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* @keytype: Input layer key type to be reported
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*
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* Map a SND_JACK_BTN_ button type to an input layer key, allowing
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* reporting of keys on accessories via the jack abstraction. If no
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* mapping is provided but keys are enabled in the jack type then
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* BTN_n numeric buttons will be reported.
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*
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* If jacks are not reporting via the input API this call will have no
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* effect.
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*
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* Note that this is intended to be use by simple devices with small
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* numbers of keys that can be reported. It is also possible to
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* access the input device directly - devices with complex input
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* capabilities on accessories should consider doing this rather than
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* using this abstraction.
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*
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* This function may only be called prior to registration of the jack.
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*
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* Return: Zero if successful, or a negative error code on failure.
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*/
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int snd_jack_set_key(struct snd_jack *jack, enum snd_jack_types type,
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int keytype)
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{
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int key = fls(SND_JACK_BTN_0) - fls(type);
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WARN_ON(jack->registered);
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if (!keytype || key >= ARRAY_SIZE(jack->key))
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return -EINVAL;
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jack->type |= type;
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jack->key[key] = keytype;
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return 0;
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}
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EXPORT_SYMBOL(snd_jack_set_key);
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/**
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* snd_jack_report - Report the current status of a jack
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*
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* @jack: The jack to report status for
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* @status: The current status of the jack
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*/
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void snd_jack_report(struct snd_jack *jack, int status)
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{
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int i;
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if (!jack)
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return;
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for (i = 0; i < ARRAY_SIZE(jack->key); i++) {
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int testbit = SND_JACK_BTN_0 >> i;
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if (jack->type & testbit)
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input_report_key(jack->input_dev, jack->key[i],
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status & testbit);
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}
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for (i = 0; i < ARRAY_SIZE(jack_switch_types); i++) {
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int testbit = 1 << i;
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if (jack->type & testbit)
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input_report_switch(jack->input_dev,
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jack_switch_types[i],
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status & testbit);
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}
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input_sync(jack->input_dev);
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}
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EXPORT_SYMBOL(snd_jack_report);
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MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
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MODULE_DESCRIPTION("Jack detection support for ALSA");
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MODULE_LICENSE("GPL");
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