--- /dev/null
+/*
+ * 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 <linux/slab.h>
+#include <linux/module.h>
+#include <sound/jack.h>
+#include <sound/core.h>
+
+static int jack_switch_types[SND_JACK_SWITCH_TYPES] = {
+ SW_HEADPHONE_INSERT,
+ SW_MICROPHONE_INSERT,
+ SW_LINEOUT_INSERT,
+ SW_JACK_PHYSICAL_INSERT,
+ SW_VIDEOOUT_INSERT,
+ SW_LINEIN_INSERT,
+};
+
+static int snd_jack_dev_disconnect(struct snd_device *device)
+{
+ struct snd_jack *jack = device->device_data;
+
+ if (!jack->input_dev)
+ return 0;
+
+ /* 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);
+ jack->input_dev = NULL;
+ return 0;
+}
+
+static int snd_jack_dev_free(struct snd_device *device)
+{
+ struct snd_jack *jack = device->device_data;
+
+ if (jack->private_free)
+ jack->private_free(jack);
+
+ snd_jack_dev_disconnect(device);
+
+ kfree(jack->id);
+ 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, i;
+
+ snprintf(jack->name, sizeof(jack->name), "%s %s",
+ card->shortname, 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 = snd_card_get_device_link(card);
+
+ /* Add capabilities for any keys that are enabled */
+ for (i = 0; i < ARRAY_SIZE(jack->key); i++) {
+ int testbit = SND_JACK_BTN_0 >> i;
+
+ if (!(jack->type & testbit))
+ continue;
+
+ if (!jack->key[i])
+ jack->key[i] = BTN_0 + i;
+
+ input_set_capability(jack->input_dev, EV_KEY, jack->key[i]);
+ }
+
+ 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.
+ *
+ * Return: 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;
+ int i;
+ static struct snd_device_ops ops = {
+ .dev_free = snd_jack_dev_free,
+ .dev_register = snd_jack_dev_register,
+ .dev_disconnect = snd_jack_dev_disconnect,
+ };
+
+ jack = kzalloc(sizeof(struct snd_jack), GFP_KERNEL);
+ if (jack == NULL)
+ return -ENOMEM;
+
+ jack->id = kstrdup(id, GFP_KERNEL);
+
+ jack->input_dev = input_allocate_device();
+ if (jack->input_dev == NULL) {
+ err = -ENOMEM;
+ goto fail_input;
+ }
+
+ jack->input_dev->phys = "ALSA";
+
+ jack->type = type;
+
+ for (i = 0; i < SND_JACK_SWITCH_TYPES; i++)
+ if (type & (1 << i))
+ input_set_capability(jack->input_dev, EV_SW,
+ jack_switch_types[i]);
+
+ 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->id);
+ 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 devices 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_set_key - Set a key mapping on a jack
+ *
+ * @jack: The jack to configure
+ * @type: Jack report type for this key
+ * @keytype: Input layer key type to be reported
+ *
+ * Map a SND_JACK_BTN_ button type to an input layer key, allowing
+ * reporting of keys on accessories via the jack abstraction. If no
+ * mapping is provided but keys are enabled in the jack type then
+ * BTN_n numeric buttons will be reported.
+ *
+ * If jacks are not reporting via the input API this call will have no
+ * effect.
+ *
+ * Note that this is intended to be use by simple devices with small
+ * numbers of keys that can be reported. It is also possible to
+ * access the input device directly - devices with complex input
+ * capabilities on accessories should consider doing this rather than
+ * using this abstraction.
+ *
+ * This function may only be called prior to registration of the jack.
+ *
+ * Return: Zero if successful, or a negative error code on failure.
+ */
+int snd_jack_set_key(struct snd_jack *jack, enum snd_jack_types type,
+ int keytype)
+{
+ int key = fls(SND_JACK_BTN_0) - fls(type);
+
+ WARN_ON(jack->registered);
+
+ if (!keytype || key >= ARRAY_SIZE(jack->key))
+ return -EINVAL;
+
+ jack->type |= type;
+ jack->key[key] = keytype;
+
+ return 0;
+}
+EXPORT_SYMBOL(snd_jack_set_key);
+
+/**
+ * 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)
+{
+ int i;
+
+ if (!jack)
+ return;
+
+ for (i = 0; i < ARRAY_SIZE(jack->key); i++) {
+ int testbit = SND_JACK_BTN_0 >> i;
+
+ if (jack->type & testbit)
+ input_report_key(jack->input_dev, jack->key[i],
+ status & testbit);
+ }
+
+ for (i = 0; i < ARRAY_SIZE(jack_switch_types); i++) {
+ int testbit = 1 << i;
+ if (jack->type & testbit)
+ input_report_switch(jack->input_dev,
+ jack_switch_types[i],
+ status & testbit);
+ }
+
+ 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");
Code Review / kvmfornfv.git / blobdiff