ALSA: Add jack reporting API

[pandora-kernel.git] / sound / core / jack.c

diff --git a/sound/core/jack.c b/sound/core/jack.c
new file mode 100644 (file)
index 0000000..8133a2b
--- /dev/null
+++ b/sound/core/jack.c
@@ -0,0 +1,163 @@
+/*
+ *  Jack abstraction layer
+ *
+ *  Copyright 2008 Wolfson Microelectronics
+ *
+ *   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; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ *
+ */
+
+#include <linux/input.h>
+#include <sound/jack.h>
+#include <sound/core.h>
+
+static int snd_jack_dev_free(struct snd_device *device)
+{
+       struct snd_jack *jack = device->device_data;
+
+       /* If the input device is registered with the input subsystem
+        * then we need to use a different deallocator. */
+       if (jack->registered)
+               input_unregister_device(jack->input_dev);
+       else
+               input_free_device(jack->input_dev);
+
+       kfree(jack);
+
+       return 0;
+}
+
+static int snd_jack_dev_register(struct snd_device *device)
+{
+       struct snd_jack *jack = device->device_data;
+       struct snd_card *card = device->card;
+       int err;
+
+       snprintf(jack->name, sizeof(jack->name), "%s %s",
+                card->longname, jack->id);
+       jack->input_dev->name = jack->name;
+
+       /* Default to the sound card device. */
+       if (!jack->input_dev->dev.parent)
+               jack->input_dev->dev.parent = card->dev;
+
+       err = input_register_device(jack->input_dev);
+       if (err == 0)
+               jack->registered = 1;
+
+       return err;
+}
+
+/**
+ * snd_jack_new - Create a new jack
+ * @card:  the card instance
+ * @id:    an identifying string for this jack
+ * @type:  a bitmask of enum snd_jack_type values that can be detected by
+ *         this jack
+ * @jjack: Used to provide the allocated jack object to the caller.
+ *
+ * Creates a new jack object.
+ *
+ * Returns zero if successful, or a negative error code on failure.
+ * On success jjack will be initialised.
+ */
+int snd_jack_new(struct snd_card *card, const char *id, int type,
+                struct snd_jack **jjack)
+{
+       struct snd_jack *jack;
+       int err;
+       static struct snd_device_ops ops = {
+               .dev_free = snd_jack_dev_free,
+               .dev_register = snd_jack_dev_register,
+       };
+
+       jack = kzalloc(sizeof(struct snd_jack), GFP_KERNEL);
+       if (jack == NULL)
+               return -ENOMEM;
+
+       jack->id = id;
+
+       jack->input_dev = input_allocate_device();
+       if (jack->input_dev == NULL) {
+               err = -ENOMEM;
+               goto fail_input;
+       }
+
+       jack->input_dev->phys = "ALSA";
+
+       jack->type = type;
+
+       if (type & SND_JACK_HEADPHONE)
+               input_set_capability(jack->input_dev, EV_SW,
+                                    SW_HEADPHONE_INSERT);
+       if (type & SND_JACK_MICROPHONE)
+               input_set_capability(jack->input_dev, EV_SW,
+                                    SW_MICROPHONE_INSERT);
+
+       err = snd_device_new(card, SNDRV_DEV_JACK, jack, &ops);
+       if (err < 0)
+               goto fail_input;
+
+       *jjack = jack;
+
+       return 0;
+
+fail_input:
+       input_free_device(jack->input_dev);
+       kfree(jack);
+       return err;
+}
+EXPORT_SYMBOL(snd_jack_new);
+
+/**
+ * snd_jack_set_parent - Set the parent device for a jack
+ *
+ * @jack:   The jack to configure
+ * @parent: The device to set as parent for the jack.
+ *
+ * Set the parent for the jack input device in the device tree.  This
+ * function is only valid prior to registration of the jack.  If no
+ * parent is configured then the parent device will be the sound card.
+ */
+void snd_jack_set_parent(struct snd_jack *jack, struct device *parent)
+{
+       WARN_ON(jack->registered);
+
+       jack->input_dev->dev.parent = parent;
+}
+EXPORT_SYMBOL(snd_jack_set_parent);
+
+/**
+ * snd_jack_report - Report the current status of a jack
+ *
+ * @jack:   The jack to report status for
+ * @status: The current status of the jack
+ */
+void snd_jack_report(struct snd_jack *jack, int status)
+{
+       if (jack->type & SND_JACK_HEADPHONE)
+               input_report_switch(jack->input_dev, SW_HEADPHONE_INSERT,
+                                   status & SND_JACK_HEADPHONE);
+       if (jack->type & SND_JACK_MICROPHONE)
+               input_report_switch(jack->input_dev, SW_MICROPHONE_INSERT,
+                                   status & SND_JACK_MICROPHONE);
+
+       input_sync(jack->input_dev);
+}
+EXPORT_SYMBOL(snd_jack_report);
+
+MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
+MODULE_DESCRIPTION("Jack detection support for ALSA");
+MODULE_LICENSE("GPL");