Fixed MTP to work with TWRP

sound/aoa/soundbus/Kconfig

@@ -0,0 +1,14 @@
+config SND_AOA_SOUNDBUS
+	tristate "Apple Soundbus support"
+	select SND_PCM
+	---help---
+	This option enables the generic driver for the soundbus
+	support on Apple machines.
+	
+	It is required for the sound bus implementations.
+
+config SND_AOA_SOUNDBUS_I2S
+	tristate "I2S bus support"
+	depends on SND_AOA_SOUNDBUS && PCI
+	---help---
+	This option enables support for Apple I2S busses.

sound/aoa/soundbus/Makefile

@@ -0,0 +1,3 @@
+obj-$(CONFIG_SND_AOA_SOUNDBUS) += snd-aoa-soundbus.o
+snd-aoa-soundbus-objs := core.o sysfs.o
+obj-$(CONFIG_SND_AOA_SOUNDBUS_I2S) += i2sbus/

sound/aoa/soundbus/core.c

@@ -0,0 +1,219 @@
+/*
+ * soundbus
+ *
+ * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ *
+ * GPL v2, can be found in COPYING.
+ */
+
+#include <linux/module.h>
+#include "soundbus.h"
+
+MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Apple Soundbus");
+
+struct soundbus_dev *soundbus_dev_get(struct soundbus_dev *dev)
+{
+	struct device *tmp;
+
+	if (!dev)
+		return NULL;
+	tmp = get_device(&dev->ofdev.dev);
+	if (tmp)
+		return to_soundbus_device(tmp);
+	else
+		return NULL;
+}
+EXPORT_SYMBOL_GPL(soundbus_dev_get);
+
+void soundbus_dev_put(struct soundbus_dev *dev)
+{
+	if (dev)
+		put_device(&dev->ofdev.dev);
+}
+EXPORT_SYMBOL_GPL(soundbus_dev_put);
+
+static int soundbus_probe(struct device *dev)
+{
+	int error = -ENODEV;
+	struct soundbus_driver *drv;
+	struct soundbus_dev *soundbus_dev;
+
+	drv = to_soundbus_driver(dev->driver);
+	soundbus_dev = to_soundbus_device(dev);
+
+	if (!drv->probe)
+		return error;
+
+	soundbus_dev_get(soundbus_dev);
+
+	error = drv->probe(soundbus_dev);
+	if (error)
+		soundbus_dev_put(soundbus_dev);
+
+	return error;
+}
+
+
+static int soundbus_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+	struct soundbus_dev * soundbus_dev;
+	struct platform_device * of;
+	const char *compat;
+	int retval = 0;
+	int cplen, seen = 0;
+
+	if (!dev)
+		return -ENODEV;
+
+	soundbus_dev = to_soundbus_device(dev);
+	if (!soundbus_dev)
+		return -ENODEV;
+
+	of = &soundbus_dev->ofdev;
+
+	/* stuff we want to pass to /sbin/hotplug */
+	retval = add_uevent_var(env, "OF_NAME=%s", of->dev.of_node->name);
+	if (retval)
+		return retval;
+
+	retval = add_uevent_var(env, "OF_TYPE=%s", of->dev.of_node->type);
+	if (retval)
+		return retval;
+
+	/* Since the compatible field can contain pretty much anything
+	 * it's not really legal to split it out with commas. We split it
+	 * up using a number of environment variables instead. */
+
+	compat = of_get_property(of->dev.of_node, "compatible", &cplen);
+	while (compat && cplen > 0) {
+		int tmp = env->buflen;
+		retval = add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat);
+		if (retval)
+			return retval;
+		compat += env->buflen - tmp;
+		cplen -= env->buflen - tmp;
+		seen += 1;
+	}
+
+	retval = add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen);
+	if (retval)
+		return retval;
+	retval = add_uevent_var(env, "MODALIAS=%s", soundbus_dev->modalias);
+
+	return retval;
+}
+
+static int soundbus_device_remove(struct device *dev)
+{
+	struct soundbus_dev * soundbus_dev = to_soundbus_device(dev);
+	struct soundbus_driver * drv = to_soundbus_driver(dev->driver);
+
+	if (dev->driver && drv->remove)
+		drv->remove(soundbus_dev);
+	soundbus_dev_put(soundbus_dev);
+
+	return 0;
+}
+
+static void soundbus_device_shutdown(struct device *dev)
+{
+	struct soundbus_dev * soundbus_dev = to_soundbus_device(dev);
+	struct soundbus_driver * drv = to_soundbus_driver(dev->driver);
+
+	if (dev->driver && drv->shutdown)
+		drv->shutdown(soundbus_dev);
+}
+
+#ifdef CONFIG_PM
+
+static int soundbus_device_suspend(struct device *dev, pm_message_t state)
+{
+	struct soundbus_dev * soundbus_dev = to_soundbus_device(dev);
+	struct soundbus_driver * drv = to_soundbus_driver(dev->driver);
+
+	if (dev->driver && drv->suspend)
+		return drv->suspend(soundbus_dev, state);
+	return 0;
+}
+
+static int soundbus_device_resume(struct device * dev)
+{
+	struct soundbus_dev * soundbus_dev = to_soundbus_device(dev);
+	struct soundbus_driver * drv = to_soundbus_driver(dev->driver);
+
+	if (dev->driver && drv->resume)
+		return drv->resume(soundbus_dev);
+	return 0;
+}
+
+#endif /* CONFIG_PM */
+
+static struct bus_type soundbus_bus_type = {
+	.name		= "aoa-soundbus",
+	.probe		= soundbus_probe,
+	.uevent		= soundbus_uevent,
+	.remove		= soundbus_device_remove,
+	.shutdown	= soundbus_device_shutdown,
+#ifdef CONFIG_PM
+	.suspend	= soundbus_device_suspend,
+	.resume		= soundbus_device_resume,
+#endif
+	.dev_attrs	= soundbus_dev_attrs,
+};
+
+int soundbus_add_one(struct soundbus_dev *dev)
+{
+	static int devcount;
+
+	/* sanity checks */
+	if (!dev->attach_codec ||
+	    !dev->ofdev.dev.of_node ||
+	    dev->pcmname ||
+	    dev->pcmid != -1) {
+		printk(KERN_ERR "soundbus: adding device failed sanity check!\n");
+		return -EINVAL;
+	}
+
+	dev_set_name(&dev->ofdev.dev, "soundbus:%x", ++devcount);
+	dev->ofdev.dev.bus = &soundbus_bus_type;
+	return of_device_register(&dev->ofdev);
+}
+EXPORT_SYMBOL_GPL(soundbus_add_one);
+
+void soundbus_remove_one(struct soundbus_dev *dev)
+{
+	of_device_unregister(&dev->ofdev);
+}
+EXPORT_SYMBOL_GPL(soundbus_remove_one);
+
+int soundbus_register_driver(struct soundbus_driver *drv)
+{
+	/* initialize common driver fields */
+	drv->driver.name = drv->name;
+	drv->driver.bus = &soundbus_bus_type;
+
+	/* register with core */
+	return driver_register(&drv->driver);
+}
+EXPORT_SYMBOL_GPL(soundbus_register_driver);
+
+void soundbus_unregister_driver(struct soundbus_driver *drv)
+{
+	driver_unregister(&drv->driver);
+}
+EXPORT_SYMBOL_GPL(soundbus_unregister_driver);
+
+static int __init soundbus_init(void)
+{
+	return bus_register(&soundbus_bus_type);
+}
+
+static void __exit soundbus_exit(void)
+{
+	bus_unregister(&soundbus_bus_type);
+}
+
+subsys_initcall(soundbus_init);
+module_exit(soundbus_exit);

sound/aoa/soundbus/i2sbus/Makefile

@@ -0,0 +1,2 @@
+obj-$(CONFIG_SND_AOA_SOUNDBUS_I2S) += snd-aoa-i2sbus.o
+snd-aoa-i2sbus-objs := core.o pcm.o control.o

sound/aoa/soundbus/i2sbus/control.c

@@ -0,0 +1,194 @@
+/*
+ * i2sbus driver -- bus control routines
+ *
+ * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ *
+ * GPL v2, can be found in COPYING.
+ */
+
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+
+#include <asm/io.h>
+#include <asm/prom.h>
+#include <asm/macio.h>
+#include <asm/pmac_feature.h>
+#include <asm/pmac_pfunc.h>
+#include <asm/keylargo.h>
+
+#include "i2sbus.h"
+
+int i2sbus_control_init(struct macio_dev* dev, struct i2sbus_control **c)
+{
+	*c = kzalloc(sizeof(struct i2sbus_control), GFP_KERNEL);
+	if (!*c)
+		return -ENOMEM;
+
+	INIT_LIST_HEAD(&(*c)->list);
+
+	(*c)->macio = dev->bus->chip;
+	return 0;
+}
+
+void i2sbus_control_destroy(struct i2sbus_control *c)
+{
+	kfree(c);
+}
+
+/* this is serialised externally */
+int i2sbus_control_add_dev(struct i2sbus_control *c,
+			   struct i2sbus_dev *i2sdev)
+{
+	struct device_node *np;
+
+	np = i2sdev->sound.ofdev.dev.of_node;
+	i2sdev->enable = pmf_find_function(np, "enable");
+	i2sdev->cell_enable = pmf_find_function(np, "cell-enable");
+	i2sdev->clock_enable = pmf_find_function(np, "clock-enable");
+	i2sdev->cell_disable = pmf_find_function(np, "cell-disable");
+	i2sdev->clock_disable = pmf_find_function(np, "clock-disable");
+
+	/* if the bus number is not 0 or 1 we absolutely need to use
+	 * the platform functions -- there's nothing in Darwin that
+	 * would allow seeing a system behind what the FCRs are then,
+	 * and I don't want to go parsing a bunch of platform functions
+	 * by hand to try finding a system... */
+	if (i2sdev->bus_number != 0 && i2sdev->bus_number != 1 &&
+	    (!i2sdev->enable ||
+	     !i2sdev->cell_enable || !i2sdev->clock_enable ||
+	     !i2sdev->cell_disable || !i2sdev->clock_disable)) {
+		pmf_put_function(i2sdev->enable);
+		pmf_put_function(i2sdev->cell_enable);
+		pmf_put_function(i2sdev->clock_enable);
+		pmf_put_function(i2sdev->cell_disable);
+		pmf_put_function(i2sdev->clock_disable);
+		return -ENODEV;
+	}
+
+	list_add(&i2sdev->item, &c->list);
+
+	return 0;
+}
+
+void i2sbus_control_remove_dev(struct i2sbus_control *c,
+			       struct i2sbus_dev *i2sdev)
+{
+	/* this is serialised externally */
+	list_del(&i2sdev->item);
+	if (list_empty(&c->list))
+		i2sbus_control_destroy(c);
+}
+
+int i2sbus_control_enable(struct i2sbus_control *c,
+			  struct i2sbus_dev *i2sdev)
+{
+	struct pmf_args args = { .count = 0 };
+	struct macio_chip *macio = c->macio;
+
+	if (i2sdev->enable)
+		return pmf_call_one(i2sdev->enable, &args);
+
+	if (macio == NULL || macio->base == NULL)
+		return -ENODEV;
+
+	switch (i2sdev->bus_number) {
+	case 0:
+		/* these need to be locked or done through
+		 * newly created feature calls! */
+		MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_ENABLE);
+		break;
+	case 1:
+		MACIO_BIS(KEYLARGO_FCR1, KL1_I2S1_ENABLE);
+		break;
+	default:
+		return -ENODEV;
+	}
+	return 0;
+}
+
+int i2sbus_control_cell(struct i2sbus_control *c,
+			struct i2sbus_dev *i2sdev,
+			int enable)
+{
+	struct pmf_args args = { .count = 0 };
+	struct macio_chip *macio = c->macio;
+
+	switch (enable) {
+	case 0:
+		if (i2sdev->cell_disable)
+			return pmf_call_one(i2sdev->cell_disable, &args);
+		break;
+	case 1:
+		if (i2sdev->cell_enable)
+			return pmf_call_one(i2sdev->cell_enable, &args);
+		break;
+	default:
+		printk(KERN_ERR "i2sbus: INVALID CELL ENABLE VALUE\n");
+		return -ENODEV;
+	}
+
+	if (macio == NULL || macio->base == NULL)
+		return -ENODEV;
+
+	switch (i2sdev->bus_number) {
+	case 0:
+		if (enable)
+			MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_CELL_ENABLE);
+		else
+			MACIO_BIC(KEYLARGO_FCR1, KL1_I2S0_CELL_ENABLE);
+		break;
+	case 1:
+		if (enable)
+			MACIO_BIS(KEYLARGO_FCR1, KL1_I2S1_CELL_ENABLE);
+		else
+			MACIO_BIC(KEYLARGO_FCR1, KL1_I2S1_CELL_ENABLE);
+		break;
+	default:
+		return -ENODEV;
+	}
+	return 0;
+}
+
+int i2sbus_control_clock(struct i2sbus_control *c,
+			 struct i2sbus_dev *i2sdev,
+			 int enable)
+{
+	struct pmf_args args = { .count = 0 };
+	struct macio_chip *macio = c->macio;
+
+	switch (enable) {
+	case 0:
+		if (i2sdev->clock_disable)
+			return pmf_call_one(i2sdev->clock_disable, &args);
+		break;
+	case 1:
+		if (i2sdev->clock_enable)
+			return pmf_call_one(i2sdev->clock_enable, &args);
+		break;
+	default:
+		printk(KERN_ERR "i2sbus: INVALID CLOCK ENABLE VALUE\n");
+		return -ENODEV;
+	}
+
+	if (macio == NULL || macio->base == NULL)
+		return -ENODEV;
+
+	switch (i2sdev->bus_number) {
+	case 0:
+		if (enable)
+			MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_CLK_ENABLE_BIT);
+		else
+			MACIO_BIC(KEYLARGO_FCR1, KL1_I2S0_CLK_ENABLE_BIT);
+		break;
+	case 1:
+		if (enable)
+			MACIO_BIS(KEYLARGO_FCR1, KL1_I2S1_CLK_ENABLE_BIT);
+		else
+			MACIO_BIC(KEYLARGO_FCR1, KL1_I2S1_CLK_ENABLE_BIT);
+		break;
+	default:
+		return -ENODEV;
+	}
+	return 0;
+}

sound/aoa/soundbus/i2sbus/core.c

@@ -0,0 +1,463 @@
+/*
+ * i2sbus driver
+ *
+ * Copyright 2006-2008 Johannes Berg <johannes@sipsolutions.net>
+ *
+ * GPL v2, can be found in COPYING.
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/interrupt.h>
+#include <linux/dma-mapping.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+
+#include <sound/core.h>
+
+#include <asm/macio.h>
+#include <asm/dbdma.h>
+
+#include "../soundbus.h"
+#include "i2sbus.h"
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
+MODULE_DESCRIPTION("Apple Soundbus: I2S support");
+
+static int force;
+module_param(force, int, 0444);
+MODULE_PARM_DESC(force, "Force loading i2sbus even when"
+			" no layout-id property is present");
+
+static struct of_device_id i2sbus_match[] = {
+	{ .name = "i2s" },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(of, i2sbus_match);
+
+static int alloc_dbdma_descriptor_ring(struct i2sbus_dev *i2sdev,
+				       struct dbdma_command_mem *r,
+				       int numcmds)
+{
+	/* one more for rounding, one for branch back, one for stop command */
+	r->size = (numcmds + 3) * sizeof(struct dbdma_cmd);
+	/* We use the PCI APIs for now until the generic one gets fixed
+	 * enough or until we get some macio-specific versions
+	 */
+	r->space = dma_zalloc_coherent(&macio_get_pci_dev(i2sdev->macio)->dev,
+				       r->size, &r->bus_addr, GFP_KERNEL);
+	if (!r->space)
+		return -ENOMEM;
+
+	r->cmds = (void*)DBDMA_ALIGN(r->space);
+	r->bus_cmd_start = r->bus_addr +
+			   (dma_addr_t)((char*)r->cmds - (char*)r->space);
+
+	return 0;
+}
+
+static void free_dbdma_descriptor_ring(struct i2sbus_dev *i2sdev,
+				       struct dbdma_command_mem *r)
+{
+	if (!r->space) return;
+
+	dma_free_coherent(&macio_get_pci_dev(i2sdev->macio)->dev,
+			    r->size, r->space, r->bus_addr);
+}
+
+static void i2sbus_release_dev(struct device *dev)
+{
+	struct i2sbus_dev *i2sdev;
+	int i;
+
+	i2sdev = container_of(dev, struct i2sbus_dev, sound.ofdev.dev);
+
+ 	if (i2sdev->intfregs) iounmap(i2sdev->intfregs);
+ 	if (i2sdev->out.dbdma) iounmap(i2sdev->out.dbdma);
+ 	if (i2sdev->in.dbdma) iounmap(i2sdev->in.dbdma);
+	for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++)
+		if (i2sdev->allocated_resource[i])
+			release_and_free_resource(i2sdev->allocated_resource[i]);
+	free_dbdma_descriptor_ring(i2sdev, &i2sdev->out.dbdma_ring);
+	free_dbdma_descriptor_ring(i2sdev, &i2sdev->in.dbdma_ring);
+	for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++)
+		free_irq(i2sdev->interrupts[i], i2sdev);
+	i2sbus_control_remove_dev(i2sdev->control, i2sdev);
+	mutex_destroy(&i2sdev->lock);
+	kfree(i2sdev);
+}
+
+static irqreturn_t i2sbus_bus_intr(int irq, void *devid)
+{
+	struct i2sbus_dev *dev = devid;
+	u32 intreg;
+
+	spin_lock(&dev->low_lock);
+	intreg = in_le32(&dev->intfregs->intr_ctl);
+
+	/* acknowledge interrupt reasons */
+	out_le32(&dev->intfregs->intr_ctl, intreg);
+
+	spin_unlock(&dev->low_lock);
+
+	return IRQ_HANDLED;
+}
+
+
+/*
+ * XXX FIXME: We test the layout_id's here to get the proper way of
+ * mapping in various registers, thanks to bugs in Apple device-trees.
+ * We could instead key off the machine model and the name of the i2s
+ * node (i2s-a). This we'll do when we move it all to macio_asic.c
+ * and have that export items for each sub-node too.
+ */
+static int i2sbus_get_and_fixup_rsrc(struct device_node *np, int index,
+				     int layout, struct resource *res)
+{
+	struct device_node *parent;
+	int pindex, rc = -ENXIO;
+	const u32 *reg;
+
+	/* Machines with layout 76 and 36 (K2 based) have a weird device
+	 * tree what we need to special case.
+	 * Normal machines just fetch the resource from the i2s-X node.
+	 * Darwin further divides normal machines into old and new layouts
+	 * with a subtely different code path but that doesn't seem necessary
+	 * in practice, they just bloated it. In addition, even on our K2
+	 * case the i2s-modem node, if we ever want to handle it, uses the
+	 * normal layout
+	 */
+	if (layout != 76 && layout != 36)
+		return of_address_to_resource(np, index, res);
+
+	parent = of_get_parent(np);
+	pindex = (index == aoa_resource_i2smmio) ? 0 : 1;
+	rc = of_address_to_resource(parent, pindex, res);
+	if (rc)
+		goto bail;
+	reg = of_get_property(np, "reg", NULL);
+	if (reg == NULL) {
+		rc = -ENXIO;
+		goto bail;
+	}
+	res->start += reg[index * 2];
+	res->end = res->start + reg[index * 2 + 1] - 1;
+ bail:
+	of_node_put(parent);
+	return rc;
+}
+
+/* FIXME: look at device node refcounting */
+static int i2sbus_add_dev(struct macio_dev *macio,
+			  struct i2sbus_control *control,
+			  struct device_node *np)
+{
+	struct i2sbus_dev *dev;
+	struct device_node *child = NULL, *sound = NULL;
+	struct resource *r;
+	int i, layout = 0, rlen, ok = force;
+	static const char *rnames[] = { "i2sbus: %s (control)",
+					"i2sbus: %s (tx)",
+					"i2sbus: %s (rx)" };
+	static irq_handler_t ints[] = {
+		i2sbus_bus_intr,
+		i2sbus_tx_intr,
+		i2sbus_rx_intr
+	};
+
+	if (strlen(np->name) != 5)
+		return 0;
+	if (strncmp(np->name, "i2s-", 4))
+		return 0;
+
+	dev = kzalloc(sizeof(struct i2sbus_dev), GFP_KERNEL);
+	if (!dev)
+		return 0;
+
+	i = 0;
+	while ((child = of_get_next_child(np, child))) {
+		if (strcmp(child->name, "sound") == 0) {
+			i++;
+			sound = child;
+		}
+	}
+	if (i == 1) {
+		const u32 *id = of_get_property(sound, "layout-id", NULL);
+
+		if (id) {
+			layout = *id;
+			snprintf(dev->sound.modalias, 32,
+				 "sound-layout-%d", layout);
+			ok = 1;
+		} else {
+			id = of_get_property(sound, "device-id", NULL);
+			/*
+			 * We probably cannot handle all device-id machines,
+			 * so restrict to those we do handle for now.
+			 */
+			if (id && (*id == 22 || *id == 14 || *id == 35 ||
+				   *id == 44)) {
+				snprintf(dev->sound.modalias, 32,
+					 "aoa-device-id-%d", *id);
+				ok = 1;
+				layout = -1;
+			}
+		}
+	}
+	/* for the time being, until we can handle non-layout-id
+	 * things in some fabric, refuse to attach if there is no
+	 * layout-id property or we haven't been forced to attach.
+	 * When there are two i2s busses and only one has a layout-id,
+	 * then this depends on the order, but that isn't important
+	 * either as the second one in that case is just a modem. */
+	if (!ok) {
+		kfree(dev);
+		return -ENODEV;
+	}
+
+	mutex_init(&dev->lock);
+	spin_lock_init(&dev->low_lock);
+	dev->sound.ofdev.archdata.dma_mask = macio->ofdev.archdata.dma_mask;
+	dev->sound.ofdev.dev.of_node = np;
+	dev->sound.ofdev.dev.dma_mask = &dev->sound.ofdev.archdata.dma_mask;
+	dev->sound.ofdev.dev.parent = &macio->ofdev.dev;
+	dev->sound.ofdev.dev.release = i2sbus_release_dev;
+	dev->sound.attach_codec = i2sbus_attach_codec;
+	dev->sound.detach_codec = i2sbus_detach_codec;
+	dev->sound.pcmid = -1;
+	dev->macio = macio;
+	dev->control = control;
+	dev->bus_number = np->name[4] - 'a';
+	INIT_LIST_HEAD(&dev->sound.codec_list);
+
+	for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++) {
+		dev->interrupts[i] = -1;
+		snprintf(dev->rnames[i], sizeof(dev->rnames[i]),
+			 rnames[i], np->name);
+	}
+	for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++) {
+		int irq = irq_of_parse_and_map(np, i);
+		if (request_irq(irq, ints[i], 0, dev->rnames[i], dev))
+			goto err;
+		dev->interrupts[i] = irq;
+	}
+
+
+	/* Resource handling is problematic as some device-trees contain
+	 * useless crap (ugh ugh ugh). We work around that here by calling
+	 * specific functions for calculating the appropriate resources.
+	 *
+	 * This will all be moved to macio_asic.c at one point
+	 */
+	for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++) {
+		if (i2sbus_get_and_fixup_rsrc(np,i,layout,&dev->resources[i]))
+			goto err;
+		/* If only we could use our resource dev->resources[i]...
+		 * but request_resource doesn't know about parents and
+		 * contained resources...
+		 */
+		dev->allocated_resource[i] =
+			request_mem_region(dev->resources[i].start,
+					   resource_size(&dev->resources[i]),
+					   dev->rnames[i]);
+		if (!dev->allocated_resource[i]) {
+			printk(KERN_ERR "i2sbus: failed to claim resource %d!\n", i);
+			goto err;
+		}
+	}
+
+	r = &dev->resources[aoa_resource_i2smmio];
+	rlen = resource_size(r);
+	if (rlen < sizeof(struct i2s_interface_regs))
+		goto err;
+	dev->intfregs = ioremap(r->start, rlen);
+
+	r = &dev->resources[aoa_resource_txdbdma];
+	rlen = resource_size(r);
+	if (rlen < sizeof(struct dbdma_regs))
+		goto err;
+	dev->out.dbdma = ioremap(r->start, rlen);
+
+	r = &dev->resources[aoa_resource_rxdbdma];
+	rlen = resource_size(r);
+	if (rlen < sizeof(struct dbdma_regs))
+		goto err;
+	dev->in.dbdma = ioremap(r->start, rlen);
+
+	if (!dev->intfregs || !dev->out.dbdma || !dev->in.dbdma)
+		goto err;
+
+	if (alloc_dbdma_descriptor_ring(dev, &dev->out.dbdma_ring,
+					MAX_DBDMA_COMMANDS))
+		goto err;
+	if (alloc_dbdma_descriptor_ring(dev, &dev->in.dbdma_ring,
+					MAX_DBDMA_COMMANDS))
+		goto err;
+
+	if (i2sbus_control_add_dev(dev->control, dev)) {
+		printk(KERN_ERR "i2sbus: control layer didn't like bus\n");
+		goto err;
+	}
+
+	if (soundbus_add_one(&dev->sound)) {
+		printk(KERN_DEBUG "i2sbus: device registration error!\n");
+		goto err;
+	}
+
+	/* enable this cell */
+	i2sbus_control_cell(dev->control, dev, 1);
+	i2sbus_control_enable(dev->control, dev);
+	i2sbus_control_clock(dev->control, dev, 1);
+
+	return 1;
+ err:
+	for (i=0;i<3;i++)
+		if (dev->interrupts[i] != -1)
+			free_irq(dev->interrupts[i], dev);
+	free_dbdma_descriptor_ring(dev, &dev->out.dbdma_ring);
+	free_dbdma_descriptor_ring(dev, &dev->in.dbdma_ring);
+	if (dev->intfregs) iounmap(dev->intfregs);
+	if (dev->out.dbdma) iounmap(dev->out.dbdma);
+	if (dev->in.dbdma) iounmap(dev->in.dbdma);
+	for (i=0;i<3;i++)
+		if (dev->allocated_resource[i])
+			release_and_free_resource(dev->allocated_resource[i]);
+	mutex_destroy(&dev->lock);
+	kfree(dev);
+	return 0;
+}
+
+static int i2sbus_probe(struct macio_dev* dev, const struct of_device_id *match)
+{
+	struct device_node *np = NULL;
+	int got = 0, err;
+	struct i2sbus_control *control = NULL;
+
+	err = i2sbus_control_init(dev, &control);
+	if (err)
+		return err;
+	if (!control) {
+		printk(KERN_ERR "i2sbus_control_init API breakage\n");
+		return -ENODEV;
+	}
+
+	while ((np = of_get_next_child(dev->ofdev.dev.of_node, np))) {
+		if (of_device_is_compatible(np, "i2sbus") ||
+		    of_device_is_compatible(np, "i2s-modem")) {
+			got += i2sbus_add_dev(dev, control, np);
+		}
+	}
+
+	if (!got) {
+		/* found none, clean up */
+		i2sbus_control_destroy(control);
+		return -ENODEV;
+	}
+
+	dev_set_drvdata(&dev->ofdev.dev, control);
+
+	return 0;
+}
+
+static int i2sbus_remove(struct macio_dev* dev)
+{
+	struct i2sbus_control *control = dev_get_drvdata(&dev->ofdev.dev);
+	struct i2sbus_dev *i2sdev, *tmp;
+
+	list_for_each_entry_safe(i2sdev, tmp, &control->list, item)
+		soundbus_remove_one(&i2sdev->sound);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int i2sbus_suspend(struct macio_dev* dev, pm_message_t state)
+{
+	struct i2sbus_control *control = dev_get_drvdata(&dev->ofdev.dev);
+	struct codec_info_item *cii;
+	struct i2sbus_dev* i2sdev;
+	int err, ret = 0;
+
+	list_for_each_entry(i2sdev, &control->list, item) {
+		/* Notify Alsa */
+		if (i2sdev->sound.pcm) {
+			/* Suspend PCM streams */
+			snd_pcm_suspend_all(i2sdev->sound.pcm);
+		}
+
+		/* Notify codecs */
+		list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
+			err = 0;
+			if (cii->codec->suspend)
+				err = cii->codec->suspend(cii, state);
+			if (err)
+				ret = err;
+		}
+
+		/* wait until streams are stopped */
+		i2sbus_wait_for_stop_both(i2sdev);
+	}
+
+	return ret;
+}
+
+static int i2sbus_resume(struct macio_dev* dev)
+{
+	struct i2sbus_control *control = dev_get_drvdata(&dev->ofdev.dev);
+	struct codec_info_item *cii;
+	struct i2sbus_dev* i2sdev;
+	int err, ret = 0;
+
+	list_for_each_entry(i2sdev, &control->list, item) {
+		/* reset i2s bus format etc. */
+		i2sbus_pcm_prepare_both(i2sdev);
+
+		/* Notify codecs so they can re-initialize */
+		list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
+			err = 0;
+			if (cii->codec->resume)
+				err = cii->codec->resume(cii);
+			if (err)
+				ret = err;
+		}
+	}
+
+	return ret;
+}
+#endif /* CONFIG_PM */
+
+static int i2sbus_shutdown(struct macio_dev* dev)
+{
+	return 0;
+}
+
+static struct macio_driver i2sbus_drv = {
+	.driver = {
+		.name = "soundbus-i2s",
+		.owner = THIS_MODULE,
+		.of_match_table = i2sbus_match,
+	},
+	.probe = i2sbus_probe,
+	.remove = i2sbus_remove,
+#ifdef CONFIG_PM
+	.suspend = i2sbus_suspend,
+	.resume = i2sbus_resume,
+#endif
+	.shutdown = i2sbus_shutdown,
+};
+
+static int __init soundbus_i2sbus_init(void)
+{
+	return macio_register_driver(&i2sbus_drv);
+}
+
+static void __exit soundbus_i2sbus_exit(void)
+{
+	macio_unregister_driver(&i2sbus_drv);
+}
+
+module_init(soundbus_i2sbus_init);
+module_exit(soundbus_i2sbus_exit);

sound/aoa/soundbus/i2sbus/i2sbus.h

@@ -0,0 +1,126 @@
+/*
+ * i2sbus driver -- private definitions
+ *
+ * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ *
+ * GPL v2, can be found in COPYING.
+ */
+#ifndef __I2SBUS_H
+#define __I2SBUS_H
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/mutex.h>
+#include <linux/completion.h>
+
+#include <sound/pcm.h>
+
+#include <asm/prom.h>
+#include <asm/pmac_feature.h>
+#include <asm/dbdma.h>
+
+#include "interface.h"
+#include "../soundbus.h"
+
+struct i2sbus_control {
+	struct list_head list;
+	struct macio_chip *macio;
+};
+
+#define MAX_DBDMA_COMMANDS	32
+
+struct dbdma_command_mem {
+	dma_addr_t bus_addr;
+	dma_addr_t bus_cmd_start;
+	struct dbdma_cmd *cmds;
+	void *space;
+	int size;
+	u32 running:1;
+	u32 stopping:1;
+};
+
+struct pcm_info {
+	u32 created:1, /* has this direction been created with alsa? */
+	    active:1;  /* is this stream active? */
+	/* runtime information */
+	struct snd_pcm_substream *substream;
+	int current_period;
+	u32 frame_count;
+	struct dbdma_command_mem dbdma_ring;
+	volatile struct dbdma_regs __iomem *dbdma;
+	struct completion *stop_completion;
+};
+
+enum {
+	aoa_resource_i2smmio = 0,
+	aoa_resource_txdbdma,
+	aoa_resource_rxdbdma,
+};
+
+struct i2sbus_dev {
+	struct soundbus_dev sound;
+	struct macio_dev *macio;
+	struct i2sbus_control *control;
+	volatile struct i2s_interface_regs __iomem *intfregs;
+
+	struct resource resources[3];
+	struct resource *allocated_resource[3];
+	int interrupts[3];
+	char rnames[3][32];
+
+	/* info about currently active substreams */
+	struct pcm_info out, in;
+	snd_pcm_format_t format;
+	unsigned int rate;
+
+	/* list for a single controller */
+	struct list_head item;
+	/* number of bus on controller */
+	int bus_number;
+	/* for use by control layer */
+	struct pmf_function *enable,
+			    *cell_enable,
+			    *cell_disable,
+			    *clock_enable,
+			    *clock_disable;
+
+	/* locks */
+	/* spinlock for low-level interrupt locking */
+	spinlock_t low_lock;
+	/* mutex for high-level consistency */
+	struct mutex lock;
+};
+
+#define soundbus_dev_to_i2sbus_dev(sdev) \
+		container_of(sdev, struct i2sbus_dev, sound)
+
+/* pcm specific functions */
+extern int
+i2sbus_attach_codec(struct soundbus_dev *dev, struct snd_card *card,
+		    struct codec_info *ci, void *data);
+extern void
+i2sbus_detach_codec(struct soundbus_dev *dev, void *data);
+extern irqreturn_t
+i2sbus_tx_intr(int irq, void *devid);
+extern irqreturn_t
+i2sbus_rx_intr(int irq, void *devid);
+
+extern void i2sbus_wait_for_stop_both(struct i2sbus_dev *i2sdev);
+extern void i2sbus_pcm_prepare_both(struct i2sbus_dev *i2sdev);
+
+/* control specific functions */
+extern int i2sbus_control_init(struct macio_dev* dev,
+			       struct i2sbus_control **c);
+extern void i2sbus_control_destroy(struct i2sbus_control *c);
+extern int i2sbus_control_add_dev(struct i2sbus_control *c,
+				  struct i2sbus_dev *i2sdev);
+extern void i2sbus_control_remove_dev(struct i2sbus_control *c,
+				      struct i2sbus_dev *i2sdev);
+extern int i2sbus_control_enable(struct i2sbus_control *c,
+				 struct i2sbus_dev *i2sdev);
+extern int i2sbus_control_cell(struct i2sbus_control *c,
+			       struct i2sbus_dev *i2sdev,
+			       int enable);
+extern int i2sbus_control_clock(struct i2sbus_control *c,
+				struct i2sbus_dev *i2sdev,
+				int enable);
+#endif /* __I2SBUS_H */

sound/aoa/soundbus/i2sbus/interface.h

@@ -0,0 +1,187 @@
+/*
+ * i2sbus driver -- interface register definitions
+ *
+ * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ *
+ * GPL v2, can be found in COPYING.
+ */
+#ifndef __I2SBUS_INTERFACE_H
+#define __I2SBUS_INTERFACE_H
+
+/* i2s bus control registers, at least what we know about them */
+
+#define __PAD(m,n) u8 __pad##m[n]
+#define _PAD(line, n) __PAD(line, n)
+#define PAD(n) _PAD(__LINE__, (n))
+struct i2s_interface_regs {
+	__le32 intr_ctl;	/* 0x00 */
+	PAD(12);
+	__le32 serial_format;	/* 0x10 */
+	PAD(12);
+	__le32 codec_msg_out;	/* 0x20 */
+	PAD(12);
+	__le32 codec_msg_in;	/* 0x30 */
+	PAD(12);
+	__le32 frame_count;	/* 0x40 */
+	PAD(12);
+	__le32 frame_match;	/* 0x50 */
+	PAD(12);
+	__le32 data_word_sizes;	/* 0x60 */
+	PAD(12);
+	__le32 peak_level_sel;	/* 0x70 */
+	PAD(12);
+	__le32 peak_level_in0;	/* 0x80 */
+	PAD(12);
+	__le32 peak_level_in1;	/* 0x90 */
+	PAD(12);
+	/* total size: 0x100 bytes */
+}  __attribute__((__packed__));
+
+/* interrupt register is just a bitfield with
+ * interrupt enable and pending bits */
+#define I2S_REG_INTR_CTL		0x00
+#	define I2S_INT_FRAME_COUNT		(1<<31)
+#	define I2S_PENDING_FRAME_COUNT		(1<<30)
+#	define I2S_INT_MESSAGE_FLAG		(1<<29)
+#	define I2S_PENDING_MESSAGE_FLAG		(1<<28)
+#	define I2S_INT_NEW_PEAK			(1<<27)
+#	define I2S_PENDING_NEW_PEAK		(1<<26)
+#	define I2S_INT_CLOCKS_STOPPED		(1<<25)
+#	define I2S_PENDING_CLOCKS_STOPPED	(1<<24)
+#	define I2S_INT_EXTERNAL_SYNC_ERROR	(1<<23)
+#	define I2S_PENDING_EXTERNAL_SYNC_ERROR	(1<<22)
+#	define I2S_INT_EXTERNAL_SYNC_OK		(1<<21)
+#	define I2S_PENDING_EXTERNAL_SYNC_OK	(1<<20)
+#	define I2S_INT_NEW_SAMPLE_RATE		(1<<19)
+#	define I2S_PENDING_NEW_SAMPLE_RATE	(1<<18)
+#	define I2S_INT_STATUS_FLAG		(1<<17)
+#	define I2S_PENDING_STATUS_FLAG		(1<<16)
+
+/* serial format register is more interesting :)
+ * It contains:
+ *  - clock source
+ *  - MClk divisor
+ *  - SClk divisor
+ *  - SClk master flag
+ *  - serial format (sony, i2s 64x, i2s 32x, dav, silabs)
+ *  - external sample frequency interrupt (don't understand)
+ *  - external sample frequency
+ */
+#define I2S_REG_SERIAL_FORMAT		0x10
+/* clock source. You get either 18.432, 45.1584 or 49.1520 MHz */
+#	define I2S_SF_CLOCK_SOURCE_SHIFT	30
+#	define I2S_SF_CLOCK_SOURCE_MASK		(3<<I2S_SF_CLOCK_SOURCE_SHIFT)
+#	define I2S_SF_CLOCK_SOURCE_18MHz	(0<<I2S_SF_CLOCK_SOURCE_SHIFT)
+#	define I2S_SF_CLOCK_SOURCE_45MHz	(1<<I2S_SF_CLOCK_SOURCE_SHIFT)
+#	define I2S_SF_CLOCK_SOURCE_49MHz	(2<<I2S_SF_CLOCK_SOURCE_SHIFT)
+/* also, let's define the exact clock speeds here, in Hz */
+#define I2S_CLOCK_SPEED_18MHz	18432000
+#define I2S_CLOCK_SPEED_45MHz	45158400
+#define I2S_CLOCK_SPEED_49MHz	49152000
+/* MClk is the clock that drives the codec, usually called its 'system clock'.
+ * It is derived by taking only every 'divisor' tick of the clock.
+ */
+#	define I2S_SF_MCLKDIV_SHIFT		24
+#	define I2S_SF_MCLKDIV_MASK		(0x1F<<I2S_SF_MCLKDIV_SHIFT)
+#	define I2S_SF_MCLKDIV_1			(0x14<<I2S_SF_MCLKDIV_SHIFT)
+#	define I2S_SF_MCLKDIV_3			(0x13<<I2S_SF_MCLKDIV_SHIFT)
+#	define I2S_SF_MCLKDIV_5			(0x12<<I2S_SF_MCLKDIV_SHIFT)
+#	define I2S_SF_MCLKDIV_14		(0x0E<<I2S_SF_MCLKDIV_SHIFT)
+#	define I2S_SF_MCLKDIV_OTHER(div)	(((div/2-1)<<I2S_SF_MCLKDIV_SHIFT)&I2S_SF_MCLKDIV_MASK)
+static inline int i2s_sf_mclkdiv(int div, int *out)
+{
+	int d;
+
+	switch(div) {
+	case 1: *out |= I2S_SF_MCLKDIV_1; return 0;
+	case 3: *out |= I2S_SF_MCLKDIV_3; return 0;
+	case 5: *out |= I2S_SF_MCLKDIV_5; return 0;
+	case 14: *out |= I2S_SF_MCLKDIV_14; return 0;
+	default:
+		if (div%2) return -1;
+		d = div/2-1;
+		if (d == 0x14 || d == 0x13 || d == 0x12 || d == 0x0E)
+			return -1;
+		*out |= I2S_SF_MCLKDIV_OTHER(div);
+		return 0;
+	}
+}
+/* SClk is the clock that drives the i2s wire bus. Note that it is
+ * derived from the MClk above by taking only every 'divisor' tick
+ * of MClk.
+ */
+#	define I2S_SF_SCLKDIV_SHIFT		20
+#	define I2S_SF_SCLKDIV_MASK		(0xF<<I2S_SF_SCLKDIV_SHIFT)
+#	define I2S_SF_SCLKDIV_1			(8<<I2S_SF_SCLKDIV_SHIFT)
+#	define I2S_SF_SCLKDIV_3			(9<<I2S_SF_SCLKDIV_SHIFT)
+#	define I2S_SF_SCLKDIV_OTHER(div)	(((div/2-1)<<I2S_SF_SCLKDIV_SHIFT)&I2S_SF_SCLKDIV_MASK)
+static inline int i2s_sf_sclkdiv(int div, int *out)
+{
+	int d;
+
+	switch(div) {
+	case 1: *out |= I2S_SF_SCLKDIV_1; return 0;
+	case 3: *out |= I2S_SF_SCLKDIV_3; return 0;
+	default:
+		if (div%2) return -1;
+		d = div/2-1;
+		if (d == 8 || d == 9) return -1;
+		*out |= I2S_SF_SCLKDIV_OTHER(div);
+		return 0;
+	}
+}
+#	define I2S_SF_SCLK_MASTER		(1<<19)
+/* serial format is the way the data is put to the i2s wire bus */
+#	define I2S_SF_SERIAL_FORMAT_SHIFT	16
+#	define I2S_SF_SERIAL_FORMAT_MASK	(7<<I2S_SF_SERIAL_FORMAT_SHIFT)
+#	define I2S_SF_SERIAL_FORMAT_SONY	(0<<I2S_SF_SERIAL_FORMAT_SHIFT)
+#	define I2S_SF_SERIAL_FORMAT_I2S_64X	(1<<I2S_SF_SERIAL_FORMAT_SHIFT)
+#	define I2S_SF_SERIAL_FORMAT_I2S_32X	(2<<I2S_SF_SERIAL_FORMAT_SHIFT)
+#	define I2S_SF_SERIAL_FORMAT_I2S_DAV	(4<<I2S_SF_SERIAL_FORMAT_SHIFT)
+#	define I2S_SF_SERIAL_FORMAT_I2S_SILABS	(5<<I2S_SF_SERIAL_FORMAT_SHIFT)
+/* unknown */
+#	define I2S_SF_EXT_SAMPLE_FREQ_INT_SHIFT	12
+#	define I2S_SF_EXT_SAMPLE_FREQ_INT_MASK	(0xF<<I2S_SF_SAMPLE_FREQ_INT_SHIFT)
+/* probably gives external frequency? */
+#	define I2S_SF_EXT_SAMPLE_FREQ_MASK	0xFFF
+
+/* used to send codec messages, but how isn't clear */
+#define I2S_REG_CODEC_MSG_OUT		0x20
+
+/* used to receive codec messages, but how isn't clear */
+#define I2S_REG_CODEC_MSG_IN		0x30
+
+/* frame count reg isn't clear to me yet, but probably useful */
+#define I2S_REG_FRAME_COUNT		0x40
+
+/* program to some value, and get interrupt if frame count reaches it */
+#define I2S_REG_FRAME_MATCH		0x50
+
+/* this register describes how the bus transfers data */
+#define I2S_REG_DATA_WORD_SIZES		0x60
+/* number of interleaved input channels */
+#	define I2S_DWS_NUM_CHANNELS_IN_SHIFT	24
+#	define I2S_DWS_NUM_CHANNELS_IN_MASK	(0x1F<<I2S_DWS_NUM_CHANNELS_IN_SHIFT)
+/* word size of input data */
+#	define I2S_DWS_DATA_IN_SIZE_SHIFT	16
+#	define I2S_DWS_DATA_IN_16BIT		(0<<I2S_DWS_DATA_IN_SIZE_SHIFT)
+#	define I2S_DWS_DATA_IN_24BIT		(3<<I2S_DWS_DATA_IN_SIZE_SHIFT)
+/* number of interleaved output channels */
+#	define I2S_DWS_NUM_CHANNELS_OUT_SHIFT	8
+#	define I2S_DWS_NUM_CHANNELS_OUT_MASK	(0x1F<<I2S_DWS_NUM_CHANNELS_OUT_SHIFT)
+/* word size of output data */
+#	define I2S_DWS_DATA_OUT_SIZE_SHIFT	0
+#	define I2S_DWS_DATA_OUT_16BIT		(0<<I2S_DWS_DATA_OUT_SIZE_SHIFT)
+#	define I2S_DWS_DATA_OUT_24BIT		(3<<I2S_DWS_DATA_OUT_SIZE_SHIFT)
+
+
+/* unknown */
+#define I2S_REG_PEAK_LEVEL_SEL		0x70
+
+/* unknown */
+#define I2S_REG_PEAK_LEVEL_IN0		0x80
+
+/* unknown */
+#define I2S_REG_PEAK_LEVEL_IN1		0x90
+
+#endif /* __I2SBUS_INTERFACE_H */

sound/aoa/soundbus/soundbus.h

@@ -0,0 +1,204 @@
+/*
+ * soundbus generic definitions
+ *
+ * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ *
+ * GPL v2, can be found in COPYING.
+ */
+#ifndef __SOUNDBUS_H
+#define __SOUNDBUS_H
+
+#include <linux/of_device.h>
+#include <sound/pcm.h>
+#include <linux/list.h>
+
+
+/* When switching from master to slave or the other way around,
+ * you don't want to have the codec chip acting as clock source
+ * while the bus still is.
+ * More importantly, while switch from slave to master, you need
+ * to turn off the chip's master function first, but then there's
+ * no clock for a while and other chips might reset, so we notify
+ * their drivers after having switched.
+ * The constants here are codec-point of view, so when we switch
+ * the soundbus to master we tell the codec we're going to switch
+ * and give it CLOCK_SWITCH_PREPARE_SLAVE!
+ */
+enum clock_switch {
+	CLOCK_SWITCH_PREPARE_SLAVE,
+	CLOCK_SWITCH_PREPARE_MASTER,
+	CLOCK_SWITCH_SLAVE,
+	CLOCK_SWITCH_MASTER,
+	CLOCK_SWITCH_NOTIFY,
+};
+
+/* information on a transfer the codec can take */
+struct transfer_info {
+	u64 formats;		/* SNDRV_PCM_FMTBIT_* */
+	unsigned int rates;	/* SNDRV_PCM_RATE_* */
+	/* flags */
+	u32 transfer_in:1, /* input = 1, output = 0 */
+	    must_be_clock_source:1;
+	/* for codecs to distinguish among their TIs */
+	int tag;
+};
+
+struct codec_info_item {
+	struct codec_info *codec;
+	void *codec_data;
+	struct soundbus_dev *sdev;
+	/* internal, to be used by the soundbus provider */
+	struct list_head list;
+};
+
+/* for prepare, where the codecs need to know
+ * what we're going to drive the bus with */
+struct bus_info {
+	/* see below */
+	int sysclock_factor;
+	int bus_factor;
+};
+
+/* information on the codec itself, plus function pointers */
+struct codec_info {
+	/* the module this lives in */
+	struct module *owner;
+
+	/* supported transfer possibilities, array terminated by
+	 * formats or rates being 0. */
+	struct transfer_info *transfers;
+
+	/* Master clock speed factor
+	 * to be used (master clock speed = sysclock_factor * sampling freq)
+	 * Unused if the soundbus provider has no such notion.
+	 */
+	int sysclock_factor;
+
+	/* Bus factor, bus clock speed = bus_factor * sampling freq)
+	 * Unused if the soundbus provider has no such notion.
+	 */
+	int bus_factor;
+
+	/* operations */
+	/* clock switching, see above */
+	int (*switch_clock)(struct codec_info_item *cii,
+			    enum clock_switch clock);
+
+	/* called for each transfer_info when the user
+	 * opens the pcm device to determine what the
+	 * hardware can support at this point in time.
+	 * That can depend on other user-switchable controls.
+	 * Return 1 if usable, 0 if not.
+	 * out points to another instance of a transfer_info
+	 * which is initialised to the values in *ti, and
+	 * it's format and rate values can be modified by
+	 * the callback if it is necessary to further restrict
+	 * the formats that can be used at the moment, for
+	 * example when one codec has multiple logical codec
+	 * info structs for multiple inputs.
+	 */
+	int (*usable)(struct codec_info_item *cii,
+		      struct transfer_info *ti,
+		      struct transfer_info *out);
+
+	/* called when pcm stream is opened, probably not implemented
+	 * most of the time since it isn't too useful */
+	int (*open)(struct codec_info_item *cii,
+		    struct snd_pcm_substream *substream);
+
+	/* called when the pcm stream is closed, at this point
+	 * the user choices can all be unlocked (see below) */
+	int (*close)(struct codec_info_item *cii,
+		     struct snd_pcm_substream *substream);
+
+	/* if the codec must forbid some user choices because
+	 * they are not valid with the substream/transfer info,
+	 * it must do so here. Example: no digital output for
+	 * incompatible framerate, say 8KHz, on Onyx.
+	 * If the selected stuff in the substream is NOT
+	 * compatible, you have to reject this call! */
+	int (*prepare)(struct codec_info_item *cii,
+		       struct bus_info *bi,
+		       struct snd_pcm_substream *substream);
+
+	/* start() is called before data is pushed to the codec.
+	 * Note that start() must be atomic! */
+	int (*start)(struct codec_info_item *cii,
+		     struct snd_pcm_substream *substream);
+
+	/* stop() is called after data is no longer pushed to the codec.
+	 * Note that stop() must be atomic! */
+	int (*stop)(struct codec_info_item *cii,
+		    struct snd_pcm_substream *substream);
+
+	int (*suspend)(struct codec_info_item *cii, pm_message_t state);
+	int (*resume)(struct codec_info_item *cii);
+};
+
+/* information on a soundbus device */
+struct soundbus_dev {
+	/* the bus it belongs to */
+	struct list_head onbuslist;
+
+	/* the of device it represents */
+	struct platform_device ofdev;
+
+	/* what modules go by */
+	char modalias[32];
+
+	/* These fields must be before attach_codec can be called.
+	 * They should be set by the owner of the alsa card object
+	 * that is needed, and whoever sets them must make sure
+	 * that they are unique within that alsa card object. */
+	char *pcmname;
+	int pcmid;
+
+	/* this is assigned by the soundbus provider in attach_codec */
+	struct snd_pcm *pcm;
+
+	/* operations */
+	/* attach a codec to this soundbus, give the alsa
+	 * card object the PCMs for this soundbus should be in.
+	 * The 'data' pointer must be unique, it is used as the
+	 * key for detach_codec(). */
+	int (*attach_codec)(struct soundbus_dev *dev, struct snd_card *card,
+			    struct codec_info *ci, void *data);
+	void (*detach_codec)(struct soundbus_dev *dev, void *data);
+	/* TODO: suspend/resume */
+
+	/* private for the soundbus provider */
+	struct list_head codec_list;
+	u32 have_out:1, have_in:1;
+};
+#define to_soundbus_device(d) container_of(d, struct soundbus_dev, ofdev.dev)
+#define of_to_soundbus_device(d) container_of(d, struct soundbus_dev, ofdev)
+
+extern int soundbus_add_one(struct soundbus_dev *dev);
+extern void soundbus_remove_one(struct soundbus_dev *dev);
+
+extern struct soundbus_dev *soundbus_dev_get(struct soundbus_dev *dev);
+extern void soundbus_dev_put(struct soundbus_dev *dev);
+
+struct soundbus_driver {
+	char *name;
+	struct module *owner;
+
+	/* we don't implement any matching at all */
+
+	int	(*probe)(struct soundbus_dev* dev);
+	int	(*remove)(struct soundbus_dev* dev);
+
+	int	(*suspend)(struct soundbus_dev* dev, pm_message_t state);
+	int	(*resume)(struct soundbus_dev* dev);
+	int	(*shutdown)(struct soundbus_dev* dev);
+
+	struct device_driver driver;
+};
+#define to_soundbus_driver(drv) container_of(drv,struct soundbus_driver, driver)
+
+extern int soundbus_register_driver(struct soundbus_driver *drv);
+extern void soundbus_unregister_driver(struct soundbus_driver *drv);
+
+extern struct device_attribute soundbus_dev_attrs[];
+
+#endif /* __SOUNDBUS_H */

sound/aoa/soundbus/sysfs.c

@@ -0,0 +1,42 @@
+#include <linux/kernel.h>
+#include <linux/stat.h>
+/* FIX UP */
+#include "soundbus.h"
+
+#define soundbus_config_of_attr(field, format_string)			\
+static ssize_t								\
+field##_show (struct device *dev, struct device_attribute *attr,	\
+              char *buf)						\
+{									\
+	struct soundbus_dev *mdev = to_soundbus_device (dev);		\
+	return sprintf (buf, format_string, mdev->ofdev.dev.of_node->field); \
+}
+
+static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
+			     char *buf)
+{
+	struct soundbus_dev *sdev = to_soundbus_device(dev);
+	struct platform_device *of = &sdev->ofdev;
+	int length;
+
+	if (*sdev->modalias) {
+		strlcpy(buf, sdev->modalias, sizeof(sdev->modalias) + 1);
+		strcat(buf, "\n");
+		length = strlen(buf);
+	} else {
+		length = sprintf(buf, "of:N%sT%s\n",
+				 of->dev.of_node->name, of->dev.of_node->type);
+	}
+
+	return length;
+}
+
+soundbus_config_of_attr (name, "%s\n");
+soundbus_config_of_attr (type, "%s\n");
+
+struct device_attribute soundbus_dev_attrs[] = {
+	__ATTR_RO(name),
+	__ATTR_RO(type),
+	__ATTR_RO(modalias),
+	__ATTR_NULL
+};