9a3f371e99
Facilitate drivers that wish to carry on if they can't create a jack input device by handling attempts to report the state of a NULL jack, removing the need to check for initialisation before use. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
167 lines
4.3 KiB
C
167 lines
4.3 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 <sound/jack.h>
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#include <sound/core.h>
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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 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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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;
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snprintf(jack->name, sizeof(jack->name), "%s %s",
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card->longname, 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 = card->dev;
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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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* Returns 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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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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};
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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 = id;
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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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if (type & SND_JACK_HEADPHONE)
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input_set_capability(jack->input_dev, EV_SW,
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SW_HEADPHONE_INSERT);
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if (type & SND_JACK_MICROPHONE)
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input_set_capability(jack->input_dev, EV_SW,
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SW_MICROPHONE_INSERT);
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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);
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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 input device 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_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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if (!jack)
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return;
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if (jack->type & SND_JACK_HEADPHONE)
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input_report_switch(jack->input_dev, SW_HEADPHONE_INSERT,
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status & SND_JACK_HEADPHONE);
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if (jack->type & SND_JACK_MICROPHONE)
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input_report_switch(jack->input_dev, SW_MICROPHONE_INSERT,
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status & SND_JACK_MICROPHONE);
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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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