ALSA: firewire-motu: add skeleton for Mark of the unicorn (MOTU) FireWire series

This commit adds an new driver for MOTU FireWire series. In this commit,
this driver just creates/removes card instance according to bus event.
More functionalities will be added in following commits.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

3 files changed, 165 insertions, 0 deletions

diff --git a/sound/firewire/motu/Makefile b/sound/firewire/motu/Makefile
new file mode 100644
index 000000000000..d7819d57eadf
--- /dev/null
+++ b/sound/firewire/motu/Makefile
@@ -0,0 +1,2 @@
+snd-firewire-motu-objs := motu.o
+obj-$(CONFIG_SND_FIREWIRE_MOTU) += snd-firewire-motu.o
diff --git a/sound/firewire/motu/motu.c b/sound/firewire/motu/motu.c
new file mode 100644
index 000000000000..2684e7447432
--- /dev/null
+++ b/sound/firewire/motu/motu.c
@@ -0,0 +1,134 @@
+/*
+ * motu.c - a part of driver for MOTU FireWire series
+ *
+ * Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
+ *
+ * Licensed under the terms of the GNU General Public License, version 2.
+ */
+
+#include "motu.h"
+
+#define OUI_MOTU        0x0001f2
+
+MODULE_DESCRIPTION("MOTU FireWire driver");
+MODULE_AUTHOR("Takashi Sakamoto <o-takashi@sakamocchi.jp>");
+MODULE_LICENSE("GPL v2");
+
+static void name_card(struct snd_motu *motu)
+{
+        struct fw_device *fw_dev = fw_parent_device(motu->unit);
+        struct fw_csr_iterator it;
+        int key, val;
+        u32 version = 0;
+
+        fw_csr_iterator_init(&it, motu->unit->directory);
+        while (fw_csr_iterator_next(&it, &key, &val)) {
+                switch (key) {
+                case CSR_VERSION:
+                        version = val;
+                        break;
+                }
+        }
+
+        strcpy(motu->card->driver, "FW-MOTU");
+        snprintf(motu->card->longname, sizeof(motu->card->longname),
+                 "MOTU (version:%d), GUID %08x%08x at %s, S%d",
+                 version,
+                 fw_dev->config_rom[3], fw_dev->config_rom[4],
+                 dev_name(&motu->unit->device), 100 << fw_dev->max_speed);
+}
+
+static void motu_card_free(struct snd_card *card)
+{
+        struct snd_motu *motu = card->private_data;
+
+        fw_unit_put(motu->unit);
+
+        mutex_destroy(&motu->mutex);
+}
+
+static int motu_probe(struct fw_unit *unit,
+                      const struct ieee1394_device_id *entry)
+{
+        struct snd_card *card;
+        struct snd_motu *motu;
+        int err;
+
+        err = snd_card_new(&unit->device, -1, NULL, THIS_MODULE,
+                           sizeof(*motu), &card);
+        if (err < 0)
+                return err;
+
+        motu = card->private_data;
+        motu->card = card;
+        motu->unit = fw_unit_get(unit);
+        card->private_free = motu_card_free;
+
+        mutex_init(&motu->mutex);
+
+        name_card(motu);
+
+        err = snd_card_register(card);
+        if (err < 0)
+                goto error;
+
+        dev_set_drvdata(&unit->device, motu);
+
+        return 0;
+error:
+        snd_card_free(card);
+        return err;
+}
+
+static void motu_remove(struct fw_unit *unit)
+{
+        struct snd_motu *motu = dev_get_drvdata(&unit->device);
+
+        /* No need to wait for releasing card object in this context. */
+        snd_card_free_when_closed(motu->card);
+}
+
+static void motu_bus_update(struct fw_unit *unit)
+{
+        return;
+}
+
+#define SND_MOTU_DEV_ENTRY(model)                       \
+{                                                       \
+        .match_flags    = IEEE1394_MATCH_VENDOR_ID |    \
+                          IEEE1394_MATCH_MODEL_ID |     \
+                          IEEE1394_MATCH_SPECIFIER_ID,  \
+        .vendor_id      = OUI_MOTU,                     \
+        .model_id       = model,                        \
+        .specifier_id   = OUI_MOTU,                     \
+}
+
+static const struct ieee1394_device_id motu_id_table[] = {
+        { }
+};
+MODULE_DEVICE_TABLE(ieee1394, motu_id_table);
+
+static struct fw_driver motu_driver = {
+        .driver   = {
+                .owner  = THIS_MODULE,
+                .name   = KBUILD_MODNAME,
+                .bus    = &fw_bus_type,
+        },
+        .probe    = motu_probe,
+        .update   = motu_bus_update,
+        .remove   = motu_remove,
+        .id_table = motu_id_table,
+};
+
+static int __init alsa_motu_init(void)
+{
+        return driver_register(&motu_driver.driver);
+}
+
+static void __exit alsa_motu_exit(void)
+{
+        driver_unregister(&motu_driver.driver);
+}
+
+module_init(alsa_motu_init);
+module_exit(alsa_motu_exit);
diff --git a/sound/firewire/motu/motu.h b/sound/firewire/motu/motu.h
new file mode 100644
index 000000000000..f3d0b2834942
--- /dev/null
+++ b/sound/firewire/motu/motu.h
@@ -0,0 +1,29 @@
+/*
+ * motu.h - a part of driver for MOTU FireWire series
+ *
+ * Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
+ *
+ * Licensed under the terms of the GNU General Public License, version 2.
+ */
+
+#ifndef SOUND_FIREWIRE_MOTU_H_INCLUDED
+#define SOUND_FIREWIRE_MOTU_H_INCLUDED
+
+#include <linux/device.h>
+#include <linux/firewire.h>
+#include <linux/firewire-constants.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+
+#include <sound/control.h>
+#include <sound/core.h>
+
+struct snd_motu {
+        struct snd_card *card;
+        struct fw_unit *unit;
+        struct mutex mutex;
+};
+
+#endif