1 files changed, 138 insertions, 0 deletions

diff --git a/sound/soc/soc-jack.c b/sound/soc/soc-jack.c
new file mode 100644
index 000000000000..8cc00c3cdf34
--- /dev/null
+++ b/sound/soc/soc-jack.c
@@ -0,0 +1,138 @@
+/*
+ * soc-jack.c  --  ALSA SoC jack handling
+ *
+ * Copyright 2008 Wolfson Microelectronics PLC.
+ *
+ * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
+ *
+ *  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.
+ */
+
+#include <sound/jack.h>
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+
+/**
+ * snd_soc_jack_new - Create a new jack
+ * @card:  ASoC card
+ * @id:    an identifying string for this jack
+ * @type:  a bitmask of enum snd_jack_type values that can be detected by
+ *         this jack
+ * @jack:  structure to use for the jack
+ *
+ * Creates a new jack object.
+ *
+ * Returns zero if successful, or a negative error code on failure.
+ * On success jack will be initialised.
+ */
+int snd_soc_jack_new(struct snd_soc_card *card, const char *id, int type,
+                     struct snd_soc_jack *jack)
+{
+        jack->card = card;
+        INIT_LIST_HEAD(&jack->pins);
+
+        return snd_jack_new(card->socdev->codec->card, id, type, &jack->jack);
+}
+EXPORT_SYMBOL_GPL(snd_soc_jack_new);
+
+/**
+ * snd_soc_jack_report - Report the current status for a jack
+ *
+ * @jack:   the jack
+ * @status: a bitmask of enum snd_jack_type values that are currently detected.
+ * @mask:   a bitmask of enum snd_jack_type values that being reported.
+ *
+ * If configured using snd_soc_jack_add_pins() then the associated
+ * DAPM pins will be enabled or disabled as appropriate and DAPM
+ * synchronised.
+ *
+ * Note: This function uses mutexes and should be called from a
+ * context which can sleep (such as a workqueue).
+ */
+void snd_soc_jack_report(struct snd_soc_jack *jack, int status, int mask)
+{
+        struct snd_soc_codec *codec = jack->card->socdev->codec;
+        struct snd_soc_jack_pin *pin;
+        int enable;
+        int oldstatus;
+
+        if (!jack) {
+                WARN_ON_ONCE(!jack);
+                return;
+        }
+
+        mutex_lock(&codec->mutex);
+
+        oldstatus = jack->status;
+
+        jack->status &= ~mask;
+        jack->status |= status;
+
+        /* The DAPM sync is expensive enough to be worth skipping */
+        if (jack->status == oldstatus)
+                goto out;
+
+        list_for_each_entry(pin, &jack->pins, list) {
+                enable = pin->mask & status;
+
+                if (pin->invert)
+                        enable = !enable;
+
+                if (enable)
+                        snd_soc_dapm_enable_pin(codec, pin->pin);
+                else
+                        snd_soc_dapm_disable_pin(codec, pin->pin);
+        }
+
+        snd_soc_dapm_sync(codec);
+
+        snd_jack_report(jack->jack, status);
+
+out:
+        mutex_unlock(&codec->mutex);
+}
+EXPORT_SYMBOL_GPL(snd_soc_jack_report);
+
+/**
+ * snd_soc_jack_add_pins - Associate DAPM pins with an ASoC jack
+ *
+ * @jack:  ASoC jack
+ * @count: Number of pins
+ * @pins:  Array of pins
+ *
+ * After this function has been called the DAPM pins specified in the
+ * pins array will have their status updated to reflect the current
+ * state of the jack whenever the jack status is updated.
+ */
+int snd_soc_jack_add_pins(struct snd_soc_jack *jack, int count,
+                          struct snd_soc_jack_pin *pins)
+{
+        int i;
+
+        for (i = 0; i < count; i++) {
+                if (!pins[i].pin) {
+                        printk(KERN_ERR "No name for pin %d\n", i);
+                        return -EINVAL;
+                }
+                if (!pins[i].mask) {
+                        printk(KERN_ERR "No mask for pin %d (%s)\n", i,
+                               pins[i].pin);
+                        return -EINVAL;
+                }
+
+                INIT_LIST_HEAD(&pins[i].list);
+                list_add(&(pins[i].list), &jack->pins);
+        }
+
+        /* Update to reflect the last reported status; canned jack
+         * implementations are likely to set their state before the
+         * card has an opportunity to associate pins.
+         */
+        snd_soc_jack_report(jack, 0, 0);
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_jack_add_pins);