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SubjectApplied "ALSA: ac97: add an ac97 bus" to the asoc tree
Date
The patch

ALSA: ac97: add an ac97 bus

has been applied to the asoc tree at

git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

From 74426fbff66eea8e8d1f42c8238c268d1e63a832 Mon Sep 17 00:00:00 2001
From: Robert Jarzmik <robert.jarzmik@free.fr>
Date: Sat, 2 Sep 2017 21:54:04 +0200
Subject: [PATCH] ALSA: ac97: add an ac97 bus

AC97 is a bus for sound usage. It enables for a AC97 AC-Link to link one
controller to 0 to 4 AC97 codecs.

The goal of this new implementation is to implement a device/driver
model for AC97, with an automatic scan of the bus and automatic
discovery of AC97 codec devices.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
include/sound/ac97/codec.h | 118 +++++++++
include/sound/ac97/compat.h | 20 ++
include/sound/ac97/controller.h | 85 +++++++
sound/ac97/Kconfig | 19 ++
sound/ac97/Makefile | 8 +
sound/ac97/ac97_core.h | 16 ++
sound/ac97/bus.c | 539 ++++++++++++++++++++++++++++++++++++++++
sound/ac97/codec.c | 15 ++
sound/ac97/snd_ac97_compat.c | 108 ++++++++
9 files changed, 928 insertions(+)
create mode 100644 include/sound/ac97/codec.h
create mode 100644 include/sound/ac97/compat.h
create mode 100644 include/sound/ac97/controller.h
create mode 100644 sound/ac97/Kconfig
create mode 100644 sound/ac97/Makefile
create mode 100644 sound/ac97/ac97_core.h
create mode 100644 sound/ac97/bus.c
create mode 100644 sound/ac97/codec.c
create mode 100644 sound/ac97/snd_ac97_compat.c

diff --git a/include/sound/ac97/codec.h b/include/sound/ac97/codec.h
new file mode 100644
index 000000000000..ec04be9ab119
--- /dev/null
+++ b/include/sound/ac97/codec.h
@@ -0,0 +1,118 @@
+/*
+ * Copyright (C) 2016 Robert Jarzmik <robert.jarzmik@free.fr>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __SOUND_AC97_CODEC2_H
+#define __SOUND_AC97_CODEC2_H
+
+#include <linux/device.h>
+
+#define AC97_ID(vendor_id1, vendor_id2) \
+ ((((vendor_id1) & 0xffff) << 16) | ((vendor_id2) & 0xffff))
+#define AC97_DRIVER_ID(vendor_id1, vendor_id2, mask_id1, mask_id2, _data) \
+ { .id = (((vendor_id1) & 0xffff) << 16) | ((vendor_id2) & 0xffff), \
+ .mask = (((mask_id1) & 0xffff) << 16) | ((mask_id2) & 0xffff), \
+ .data = (_data) }
+
+struct ac97_controller;
+struct clk;
+
+/**
+ * struct ac97_id - matches a codec device and driver on an ac97 bus
+ * @id: The significant bits if the codec vendor ID1 and ID2
+ * @mask: Bitmask specifying which bits of the id field are significant when
+ * matching. A driver binds to a device when :
+ * ((vendorID1 << 8 | vendorID2) & (mask_id1 << 8 | mask_id2)) == id.
+ * @data: Private data used by the driver.
+ */
+struct ac97_id {
+ unsigned int id;
+ unsigned int mask;
+ void *data;
+};
+
+/**
+ * ac97_codec_device - a ac97 codec
+ * @dev: the core device
+ * @vendor_id: the vendor_id of the codec, as sensed on the AC-link
+ * @num: the codec number, 0 is primary, 1 is first slave, etc ...
+ * @clk: the clock BIT_CLK provided by the codec
+ * @ac97_ctrl: ac97 digital controller on the same AC-link
+ *
+ * This is the device instantiated for each codec living on a AC-link. There are
+ * normally 0 to 4 codec devices per AC-link, and all of them are controlled by
+ * an AC97 digital controller.
+ */
+struct ac97_codec_device {
+ struct device dev;
+ unsigned int vendor_id;
+ unsigned int num;
+ struct clk *clk;
+ struct ac97_controller *ac97_ctrl;
+};
+
+/**
+ * ac97_codec_driver - a ac97 codec driver
+ * @driver: the device driver structure
+ * @probe: the function called when a ac97_codec_device is matched
+ * @remove: the function called when the device is unbound/removed
+ * @shutdown: shutdown function (might be NULL)
+ * @id_table: ac97 vendor_id match table, { } member terminated
+ */
+struct ac97_codec_driver {
+ struct device_driver driver;
+ int (*probe)(struct ac97_codec_device *);
+ int (*remove)(struct ac97_codec_device *);
+ void (*shutdown)(struct ac97_codec_device *);
+ const struct ac97_id *id_table;
+};
+
+static inline struct ac97_codec_device *to_ac97_device(struct device *d)
+{
+ return container_of(d, struct ac97_codec_device, dev);
+}
+
+static inline struct ac97_codec_driver *to_ac97_driver(struct device_driver *d)
+{
+ return container_of(d, struct ac97_codec_driver, driver);
+}
+
+#if IS_ENABLED(CONFIG_AC97_BUS_NEW)
+int snd_ac97_codec_driver_register(struct ac97_codec_driver *drv);
+void snd_ac97_codec_driver_unregister(struct ac97_codec_driver *drv);
+#else
+static inline int
+snd_ac97_codec_driver_register(struct ac97_codec_driver *drv)
+{
+ return 0;
+}
+static inline void
+snd_ac97_codec_driver_unregister(struct ac97_codec_driver *drv)
+{
+}
+#endif
+
+
+static inline struct device *
+ac97_codec_dev2dev(struct ac97_codec_device *adev)
+{
+ return &adev->dev;
+}
+
+static inline void *ac97_get_drvdata(struct ac97_codec_device *adev)
+{
+ return dev_get_drvdata(ac97_codec_dev2dev(adev));
+}
+
+static inline void ac97_set_drvdata(struct ac97_codec_device *adev,
+ void *data)
+{
+ dev_set_drvdata(ac97_codec_dev2dev(adev), data);
+}
+
+void *snd_ac97_codec_get_platdata(const struct ac97_codec_device *adev);
+
+#endif
diff --git a/include/sound/ac97/compat.h b/include/sound/ac97/compat.h
new file mode 100644
index 000000000000..1351cba40048
--- /dev/null
+++ b/include/sound/ac97/compat.h
@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) 2016 Robert Jarzmik <robert.jarzmik@free.fr>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This file is for backward compatibility with snd_ac97 structure and its
+ * multiple usages, such as the snd_ac97_bus and snd_ac97_build_ops.
+ *
+ */
+#ifndef AC97_COMPAT_H
+#define AC97_COMPAT_H
+
+#include <sound/ac97_codec.h>
+
+struct snd_ac97 *snd_ac97_compat_alloc(struct ac97_codec_device *adev);
+void snd_ac97_compat_release(struct snd_ac97 *ac97);
+
+#endif
diff --git a/include/sound/ac97/controller.h b/include/sound/ac97/controller.h
new file mode 100644
index 000000000000..b36ecdd64f14
--- /dev/null
+++ b/include/sound/ac97/controller.h
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2016 Robert Jarzmik <robert.jarzmik@free.fr>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef AC97_CONTROLLER_H
+#define AC97_CONTROLLER_H
+
+#include <linux/device.h>
+#include <linux/list.h>
+
+#define AC97_BUS_MAX_CODECS 4
+#define AC97_SLOTS_AVAILABLE_ALL 0xf
+
+struct ac97_controller_ops;
+
+/**
+ * struct ac97_controller - The AC97 controller of the AC-Link
+ * @ops: the AC97 operations.
+ * @controllers: linked list of all existing controllers.
+ * @adap: the shell device ac97-%d, ie. ac97 adapter
+ * @nr: the number of the shell device
+ * @slots_available: the mask of accessible/scanable codecs.
+ * @parent: the device providing the AC97 controller.
+ * @codecs: the 4 possible AC97 codecs (NULL if none found).
+ * @codecs_pdata: platform_data for each codec (NULL if no pdata).
+ *
+ * This structure is internal to AC97 bus, and should not be used by the
+ * controllers themselves, excepting for using @dev.
+ */
+struct ac97_controller {
+ const struct ac97_controller_ops *ops;
+ struct list_head controllers;
+ struct device adap;
+ int nr;
+ unsigned short slots_available;
+ struct device *parent;
+ struct ac97_codec_device *codecs[AC97_BUS_MAX_CODECS];
+ void *codecs_pdata[AC97_BUS_MAX_CODECS];
+};
+
+/**
+ * struct ac97_controller_ops - The AC97 operations
+ * @reset: Cold reset of the AC97 AC-Link.
+ * @warm_reset: Warm reset of the AC97 AC-Link.
+ * @read: Read of a single AC97 register.
+ * Returns the register value or a negative error code.
+ * @write: Write of a single AC97 register.
+ *
+ * These are the basic operation an AC97 controller must provide for an AC97
+ * access functions. Amongst these, all but the last 2 are mandatory.
+ * The slot number is also known as the AC97 codec number, between 0 and 3.
+ */
+struct ac97_controller_ops {
+ void (*reset)(struct ac97_controller *adrv);
+ void (*warm_reset)(struct ac97_controller *adrv);
+ int (*write)(struct ac97_controller *adrv, int slot,
+ unsigned short reg, unsigned short val);
+ int (*read)(struct ac97_controller *adrv, int slot, unsigned short reg);
+};
+
+#if IS_ENABLED(CONFIG_AC97_BUS_NEW)
+struct ac97_controller *snd_ac97_controller_register(
+ const struct ac97_controller_ops *ops, struct device *dev,
+ unsigned short slots_available, void **codecs_pdata);
+void snd_ac97_controller_unregister(struct ac97_controller *ac97_ctrl);
+#else
+static inline struct ac97_controller *
+snd_ac97_controller_register(const struct ac97_controller_ops *ops,
+ struct device *dev,
+ unsigned short slots_available,
+ void **codecs_pdata)
+{
+ return ERR_PTR(-ENODEV);
+}
+
+static inline void
+snd_ac97_controller_unregister(struct ac97_controller *ac97_ctrl)
+{
+}
+#endif
+
+#endif
diff --git a/sound/ac97/Kconfig b/sound/ac97/Kconfig
new file mode 100644
index 000000000000..f8a64e15e5bf
--- /dev/null
+++ b/sound/ac97/Kconfig
@@ -0,0 +1,19 @@
+#
+# AC97 configuration
+#
+
+
+config AC97_BUS_NEW
+ tristate
+ select AC97
+ help
+ This is the new AC97 bus type, successor of AC97_BUS. The ported
+ drivers which benefit from the AC97 automatic probing should "select"
+ this instead of the AC97_BUS.
+ Say Y here if you want to have AC97 devices, which are sound oriented
+ devices around an AC-Link.
+
+config AC97_BUS_COMPAT
+ bool
+ depends on AC97_BUS_NEW
+ depends on !AC97_BUS
diff --git a/sound/ac97/Makefile b/sound/ac97/Makefile
new file mode 100644
index 000000000000..f9c2640bfb59
--- /dev/null
+++ b/sound/ac97/Makefile
@@ -0,0 +1,8 @@
+#
+# make for AC97 bus drivers
+#
+
+obj-$(CONFIG_AC97_BUS_NEW) += ac97.o
+
+ac97-y += bus.o codec.o
+ac97-$(CONFIG_AC97_BUS_COMPAT) += snd_ac97_compat.o
diff --git a/sound/ac97/ac97_core.h b/sound/ac97/ac97_core.h
new file mode 100644
index 000000000000..08441a4fda7c
--- /dev/null
+++ b/sound/ac97/ac97_core.h
@@ -0,0 +1,16 @@
+/*
+ * Copyright (C) 2016 Robert Jarzmik <robert.jarzmik@free.fr>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+unsigned int snd_ac97_bus_scan_one(struct ac97_controller *ac97,
+ unsigned int codec_num);
+
+static inline bool ac97_ids_match(unsigned int id1, unsigned int id2,
+ unsigned int mask)
+{
+ return (id1 & mask) == (id2 & mask);
+}
diff --git a/sound/ac97/bus.c b/sound/ac97/bus.c
new file mode 100644
index 000000000000..31f858eceffc
--- /dev/null
+++ b/sound/ac97/bus.c
@@ -0,0 +1,539 @@
+/*
+ * Copyright (C) 2016 Robert Jarzmik <robert.jarzmik@free.fr>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/idr.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+#include <sound/ac97/codec.h>
+#include <sound/ac97/controller.h>
+#include <sound/ac97/regs.h>
+
+#include "ac97_core.h"
+
+/*
+ * Protects ac97_controllers and each ac97_controller structure.
+ */
+static DEFINE_MUTEX(ac97_controllers_mutex);
+static DEFINE_IDR(ac97_adapter_idr);
+static LIST_HEAD(ac97_controllers);
+
+static struct bus_type ac97_bus_type;
+
+static inline struct ac97_controller*
+to_ac97_controller(struct device *ac97_adapter)
+{
+ return container_of(ac97_adapter, struct ac97_controller, adap);
+}
+
+static int ac97_unbound_ctrl_write(struct ac97_controller *adrv, int slot,
+ unsigned short reg, unsigned short val)
+{
+ return -ENODEV;
+}
+
+static int ac97_unbound_ctrl_read(struct ac97_controller *adrv, int slot,
+ unsigned short reg)
+{
+ return -ENODEV;
+}
+
+static const struct ac97_controller_ops ac97_unbound_ctrl_ops = {
+ .write = ac97_unbound_ctrl_write,
+ .read = ac97_unbound_ctrl_read,
+};
+
+static struct ac97_controller ac97_unbound_ctrl = {
+ .ops = &ac97_unbound_ctrl_ops,
+};
+
+static struct ac97_codec_device *
+ac97_codec_find(struct ac97_controller *ac97_ctrl, unsigned int codec_num)
+{
+ if (codec_num >= AC97_BUS_MAX_CODECS)
+ return ERR_PTR(-EINVAL);
+
+ return ac97_ctrl->codecs[codec_num];
+}
+
+static void ac97_codec_release(struct device *dev)
+{
+ struct ac97_codec_device *adev;
+ struct ac97_controller *ac97_ctrl;
+
+ adev = to_ac97_device(dev);
+ ac97_ctrl = adev->ac97_ctrl;
+ ac97_ctrl->codecs[adev->num] = NULL;
+ kfree(adev);
+}
+
+static int ac97_codec_add(struct ac97_controller *ac97_ctrl, int idx,
+ unsigned int vendor_id)
+{
+ struct ac97_codec_device *codec;
+ int ret;
+
+ codec = kzalloc(sizeof(*codec), GFP_KERNEL);
+ if (!codec)
+ return -ENOMEM;
+ ac97_ctrl->codecs[idx] = codec;
+ codec->vendor_id = vendor_id;
+ codec->dev.release = ac97_codec_release;
+ codec->dev.bus = &ac97_bus_type;
+ codec->dev.parent = &ac97_ctrl->adap;
+ codec->num = idx;
+ codec->ac97_ctrl = ac97_ctrl;
+
+ device_initialize(&codec->dev);
+ dev_set_name(&codec->dev, "%s:%u", dev_name(ac97_ctrl->parent), idx);
+
+ ret = device_add(&codec->dev);
+ if (ret)
+ goto err_free_codec;
+
+ return 0;
+err_free_codec:
+ put_device(&codec->dev);
+ kfree(codec);
+ ac97_ctrl->codecs[idx] = NULL;
+
+ return ret;
+}
+
+unsigned int snd_ac97_bus_scan_one(struct ac97_controller *adrv,
+ unsigned int codec_num)
+{
+ unsigned short vid1, vid2;
+ int ret;
+
+ ret = adrv->ops->read(adrv, codec_num, AC97_VENDOR_ID1);
+ vid1 = (ret & 0xffff);
+ if (ret < 0)
+ return 0;
+
+ ret = adrv->ops->read(adrv, codec_num, AC97_VENDOR_ID2);
+ vid2 = (ret & 0xffff);
+ if (ret < 0)
+ return 0;
+
+ dev_dbg(&adrv->adap, "%s(codec_num=%u): vendor_id=0x%08x\n",
+ __func__, codec_num, AC97_ID(vid1, vid2));
+ return AC97_ID(vid1, vid2);
+}
+
+static int ac97_bus_scan(struct ac97_controller *ac97_ctrl)
+{
+ int ret, i;
+ unsigned int vendor_id;
+
+ for (i = 0; i < AC97_BUS_MAX_CODECS; i++) {
+ if (ac97_codec_find(ac97_ctrl, i))
+ continue;
+ if (!(ac97_ctrl->slots_available & BIT(i)))
+ continue;
+ vendor_id = snd_ac97_bus_scan_one(ac97_ctrl, i);
+ if (!vendor_id)
+ continue;
+
+ ret = ac97_codec_add(ac97_ctrl, i, vendor_id);
+ if (ret < 0)
+ return ret;
+ }
+ return 0;
+}
+
+static int ac97_bus_reset(struct ac97_controller *ac97_ctrl)
+{
+ ac97_ctrl->ops->reset(ac97_ctrl);
+
+ return 0;
+}
+
+/**
+ * snd_ac97_codec_driver_register - register an AC97 codec driver
+ * @dev: AC97 driver codec to register
+ *
+ * Register an AC97 codec driver to the ac97 bus driver, aka. the AC97 digital
+ * controller.
+ *
+ * Returns 0 on success or error code
+ */
+int snd_ac97_codec_driver_register(struct ac97_codec_driver *drv)
+{
+ drv->driver.bus = &ac97_bus_type;
+ return driver_register(&drv->driver);
+}
+EXPORT_SYMBOL_GPL(snd_ac97_codec_driver_register);
+
+/**
+ * snd_ac97_codec_driver_unregister - unregister an AC97 codec driver
+ * @dev: AC97 codec driver to unregister
+ *
+ * Unregister a previously registered ac97 codec driver.
+ */
+void snd_ac97_codec_driver_unregister(struct ac97_codec_driver *drv)
+{
+ driver_unregister(&drv->driver);
+}
+EXPORT_SYMBOL_GPL(snd_ac97_codec_driver_unregister);
+
+/**
+ * snd_ac97_codec_get_platdata - get platform_data
+ * @adev: the ac97 codec device
+ *
+ * For legacy platforms, in order to have platform_data in codec drivers
+ * available, while ac97 device are auto-created upon probe, this retrieves the
+ * platdata which was setup on ac97 controller registration.
+ *
+ * Returns the platform data pointer
+ */
+void *snd_ac97_codec_get_platdata(const struct ac97_codec_device *adev)
+{
+ struct ac97_controller *ac97_ctrl = adev->ac97_ctrl;
+
+ return ac97_ctrl->codecs_pdata[adev->num];
+}
+EXPORT_SYMBOL_GPL(snd_ac97_codec_get_platdata);
+
+static void ac97_ctrl_codecs_unregister(struct ac97_controller *ac97_ctrl)
+{
+ int i;
+
+ for (i = 0; i < AC97_BUS_MAX_CODECS; i++)
+ if (ac97_ctrl->codecs[i]) {
+ ac97_ctrl->codecs[i]->ac97_ctrl = &ac97_unbound_ctrl;
+ device_unregister(&ac97_ctrl->codecs[i]->dev);
+ }
+}
+
+static ssize_t cold_reset_store(struct device *dev,
+ struct device_attribute *attr, const char *buf,
+ size_t len)
+{
+ struct ac97_controller *ac97_ctrl;
+
+ mutex_lock(&ac97_controllers_mutex);
+ ac97_ctrl = to_ac97_controller(dev);
+ ac97_ctrl->ops->reset(ac97_ctrl);
+ mutex_unlock(&ac97_controllers_mutex);
+ return len;
+}
+static DEVICE_ATTR_WO(cold_reset);
+
+static ssize_t warm_reset_store(struct device *dev,
+ struct device_attribute *attr, const char *buf,
+ size_t len)
+{
+ struct ac97_controller *ac97_ctrl;
+
+ if (!dev)
+ return -ENODEV;
+
+ mutex_lock(&ac97_controllers_mutex);
+ ac97_ctrl = to_ac97_controller(dev);
+ ac97_ctrl->ops->warm_reset(ac97_ctrl);
+ mutex_unlock(&ac97_controllers_mutex);
+ return len;
+}
+static DEVICE_ATTR_WO(warm_reset);
+
+static struct attribute *ac97_controller_device_attrs[] = {
+ &dev_attr_cold_reset.attr,
+ &dev_attr_warm_reset.attr,
+ NULL
+};
+
+static struct attribute_group ac97_adapter_attr_group = {
+ .name = "ac97_operations",
+ .attrs = ac97_controller_device_attrs,
+};
+
+static const struct attribute_group *ac97_adapter_groups[] = {
+ &ac97_adapter_attr_group,
+ NULL,
+};
+
+static void ac97_del_adapter(struct ac97_controller *ac97_ctrl)
+{
+ mutex_lock(&ac97_controllers_mutex);
+ ac97_ctrl_codecs_unregister(ac97_ctrl);
+ list_del(&ac97_ctrl->controllers);
+ mutex_unlock(&ac97_controllers_mutex);
+
+ device_unregister(&ac97_ctrl->adap);
+}
+
+static void ac97_adapter_release(struct device *dev)
+{
+ struct ac97_controller *ac97_ctrl;
+
+ ac97_ctrl = to_ac97_controller(dev);
+ idr_remove(&ac97_adapter_idr, ac97_ctrl->nr);
+ dev_dbg(&ac97_ctrl->adap, "adapter unregistered by %s\n",
+ dev_name(ac97_ctrl->parent));
+}
+
+static const struct device_type ac97_adapter_type = {
+ .groups = ac97_adapter_groups,
+ .release = ac97_adapter_release,
+};
+
+static int ac97_add_adapter(struct ac97_controller *ac97_ctrl)
+{
+ int ret;
+
+ mutex_lock(&ac97_controllers_mutex);
+ ret = idr_alloc(&ac97_adapter_idr, ac97_ctrl, 0, 0, GFP_KERNEL);
+ ac97_ctrl->nr = ret;
+ if (ret >= 0) {
+ dev_set_name(&ac97_ctrl->adap, "ac97-%d", ret);
+ ac97_ctrl->adap.type = &ac97_adapter_type;
+ ac97_ctrl->adap.parent = ac97_ctrl->parent;
+ ret = device_register(&ac97_ctrl->adap);
+ if (ret)
+ put_device(&ac97_ctrl->adap);
+ }
+ if (!ret)
+ list_add(&ac97_ctrl->controllers, &ac97_controllers);
+ mutex_unlock(&ac97_controllers_mutex);
+
+ if (!ret)
+ dev_dbg(&ac97_ctrl->adap, "adapter registered by %s\n",
+ dev_name(ac97_ctrl->parent));
+ return ret;
+}
+
+/**
+ * snd_ac97_controller_register - register an ac97 controller
+ * @ops: the ac97 bus operations
+ * @dev: the device providing the ac97 DC function
+ * @slots_available: mask of the ac97 codecs that can be scanned and probed
+ * bit0 => codec 0, bit1 => codec 1 ... bit 3 => codec 3
+ *
+ * Register a digital controller which can control up to 4 ac97 codecs. This is
+ * the controller side of the AC97 AC-link, while the slave side are the codecs.
+ *
+ * Returns a valid controller upon success, negative pointer value upon error
+ */
+struct ac97_controller *snd_ac97_controller_register(
+ const struct ac97_controller_ops *ops, struct device *dev,
+ unsigned short slots_available, void **codecs_pdata)
+{
+ struct ac97_controller *ac97_ctrl;
+ int ret, i;
+
+ ac97_ctrl = kzalloc(sizeof(*ac97_ctrl), GFP_KERNEL);
+ if (!ac97_ctrl)
+ return ERR_PTR(-ENOMEM);
+
+ for (i = 0; i < AC97_BUS_MAX_CODECS && codecs_pdata; i++)
+ ac97_ctrl->codecs_pdata[i] = codecs_pdata[i];
+
+ ac97_ctrl->ops = ops;
+ ac97_ctrl->slots_available = slots_available;
+ ac97_ctrl->parent = dev;
+ ret = ac97_add_adapter(ac97_ctrl);
+
+ if (ret)
+ goto err;
+ ac97_bus_reset(ac97_ctrl);
+ ac97_bus_scan(ac97_ctrl);
+
+ return ac97_ctrl;
+err:
+ kfree(ac97_ctrl);
+ return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(snd_ac97_controller_register);
+
+/**
+ * snd_ac97_controller_unregister - unregister an ac97 controller
+ * @ac97_ctrl: the device previously provided to ac97_controller_register()
+ *
+ */
+void snd_ac97_controller_unregister(struct ac97_controller *ac97_ctrl)
+{
+ ac97_del_adapter(ac97_ctrl);
+}
+EXPORT_SYMBOL_GPL(snd_ac97_controller_unregister);
+
+#ifdef CONFIG_PM
+static int ac97_pm_runtime_suspend(struct device *dev)
+{
+ struct ac97_codec_device *codec = to_ac97_device(dev);
+ int ret = pm_generic_runtime_suspend(dev);
+
+ if (ret == 0 && dev->driver) {
+ if (pm_runtime_is_irq_safe(dev))
+ clk_disable(codec->clk);
+ else
+ clk_disable_unprepare(codec->clk);
+ }
+
+ return ret;
+}
+
+static int ac97_pm_runtime_resume(struct device *dev)
+{
+ struct ac97_codec_device *codec = to_ac97_device(dev);
+ int ret;
+
+ if (dev->driver) {
+ if (pm_runtime_is_irq_safe(dev))
+ ret = clk_enable(codec->clk);
+ else
+ ret = clk_prepare_enable(codec->clk);
+ if (ret)
+ return ret;
+ }
+
+ return pm_generic_runtime_resume(dev);
+}
+#endif /* CONFIG_PM */
+
+static const struct dev_pm_ops ac97_pm = {
+ .suspend = pm_generic_suspend,
+ .resume = pm_generic_resume,
+ .freeze = pm_generic_freeze,
+ .thaw = pm_generic_thaw,
+ .poweroff = pm_generic_poweroff,
+ .restore = pm_generic_restore,
+ SET_RUNTIME_PM_OPS(
+ ac97_pm_runtime_suspend,
+ ac97_pm_runtime_resume,
+ NULL)
+};
+
+static int ac97_get_enable_clk(struct ac97_codec_device *adev)
+{
+ int ret;
+
+ adev->clk = clk_get(&adev->dev, "ac97_clk");
+ if (IS_ERR(adev->clk))
+ return PTR_ERR(adev->clk);
+
+ ret = clk_prepare_enable(adev->clk);
+ if (ret)
+ clk_put(adev->clk);
+
+ return ret;
+}
+
+static void ac97_put_disable_clk(struct ac97_codec_device *adev)
+{
+ clk_disable_unprepare(adev->clk);
+ clk_put(adev->clk);
+}
+
+static ssize_t vendor_id_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ac97_codec_device *codec = to_ac97_device(dev);
+
+ return sprintf(buf, "%08x", codec->vendor_id);
+}
+DEVICE_ATTR_RO(vendor_id);
+
+static struct attribute *ac97_dev_attrs[] = {
+ &dev_attr_vendor_id.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(ac97_dev);
+
+static int ac97_bus_match(struct device *dev, struct device_driver *drv)
+{
+ struct ac97_codec_device *adev = to_ac97_device(dev);
+ struct ac97_codec_driver *adrv = to_ac97_driver(drv);
+ const struct ac97_id *id = adrv->id_table;
+ int i = 0;
+
+ if (adev->vendor_id == 0x0 || adev->vendor_id == 0xffffffff)
+ return false;
+
+ do {
+ if (ac97_ids_match(id[i].id, adev->vendor_id, id[i].mask))
+ return true;
+ } while (id[i++].id);
+
+ return false;
+}
+
+static int ac97_bus_probe(struct device *dev)
+{
+ struct ac97_codec_device *adev = to_ac97_device(dev);
+ struct ac97_codec_driver *adrv = to_ac97_driver(dev->driver);
+ int ret;
+
+ ret = ac97_get_enable_clk(adev);
+ if (ret)
+ return ret;
+
+ pm_runtime_get_noresume(dev);
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+
+ ret = adrv->probe(adev);
+ if (ret == 0)
+ return 0;
+
+ pm_runtime_disable(dev);
+ pm_runtime_set_suspended(dev);
+ pm_runtime_put_noidle(dev);
+ ac97_put_disable_clk(adev);
+
+ return ret;
+}
+
+static int ac97_bus_remove(struct device *dev)
+{
+ struct ac97_codec_device *adev = to_ac97_device(dev);
+ struct ac97_codec_driver *adrv = to_ac97_driver(dev->driver);
+ int ret;
+
+ ret = pm_runtime_get_sync(dev);
+ if (ret)
+ return ret;
+
+ ret = adrv->remove(adev);
+ pm_runtime_put_noidle(dev);
+ if (ret == 0)
+ ac97_put_disable_clk(adev);
+
+ return ret;
+}
+
+static struct bus_type ac97_bus_type = {
+ .name = "ac97bus",
+ .dev_groups = ac97_dev_groups,
+ .match = ac97_bus_match,
+ .pm = &ac97_pm,
+ .probe = ac97_bus_probe,
+ .remove = ac97_bus_remove,
+};
+
+static int __init ac97_bus_init(void)
+{
+ return bus_register(&ac97_bus_type);
+}
+subsys_initcall(ac97_bus_init);
+
+static void __exit ac97_bus_exit(void)
+{
+ bus_unregister(&ac97_bus_type);
+}
+module_exit(ac97_bus_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>");
diff --git a/sound/ac97/codec.c b/sound/ac97/codec.c
new file mode 100644
index 000000000000..a835f03744bf
--- /dev/null
+++ b/sound/ac97/codec.c
@@ -0,0 +1,15 @@
+/*
+ * Copyright (C) 2016 Robert Jarzmik <robert.jarzmik@free.fr>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <sound/ac97_codec.h>
+#include <sound/ac97/codec.h>
+#include <sound/ac97/controller.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <sound/soc.h> /* For compat_ac97_* */
+
diff --git a/sound/ac97/snd_ac97_compat.c b/sound/ac97/snd_ac97_compat.c
new file mode 100644
index 000000000000..61544e0d8de4
--- /dev/null
+++ b/sound/ac97/snd_ac97_compat.c
@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2016 Robert Jarzmik <robert.jarzmik@free.fr>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <sound/ac97/codec.h>
+#include <sound/ac97/compat.h>
+#include <sound/ac97/controller.h>
+#include <sound/soc.h>
+
+#include "ac97_core.h"
+
+static void compat_ac97_reset(struct snd_ac97 *ac97)
+{
+ struct ac97_codec_device *adev = to_ac97_device(ac97->private_data);
+ struct ac97_controller *actrl = adev->ac97_ctrl;
+
+ if (actrl->ops->reset)
+ actrl->ops->reset(actrl);
+}
+
+static void compat_ac97_warm_reset(struct snd_ac97 *ac97)
+{
+ struct ac97_codec_device *adev = to_ac97_device(ac97->private_data);
+ struct ac97_controller *actrl = adev->ac97_ctrl;
+
+ if (actrl->ops->warm_reset)
+ actrl->ops->warm_reset(actrl);
+}
+
+static void compat_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
+ unsigned short val)
+{
+ struct ac97_codec_device *adev = to_ac97_device(ac97->private_data);
+ struct ac97_controller *actrl = adev->ac97_ctrl;
+
+ actrl->ops->write(actrl, ac97->num, reg, val);
+}
+
+static unsigned short compat_ac97_read(struct snd_ac97 *ac97,
+ unsigned short reg)
+{
+ struct ac97_codec_device *adev = to_ac97_device(ac97->private_data);
+ struct ac97_controller *actrl = adev->ac97_ctrl;
+
+ return actrl->ops->read(actrl, ac97->num, reg);
+}
+
+static struct snd_ac97_bus_ops compat_snd_ac97_bus_ops = {
+ .reset = compat_ac97_reset,
+ .warm_reset = compat_ac97_warm_reset,
+ .write = compat_ac97_write,
+ .read = compat_ac97_read,
+};
+
+static struct snd_ac97_bus compat_soc_ac97_bus = {
+ .ops = &compat_snd_ac97_bus_ops,
+};
+
+struct snd_ac97 *snd_ac97_compat_alloc(struct ac97_codec_device *adev)
+{
+ struct snd_ac97 *ac97;
+
+ ac97 = kzalloc(sizeof(struct snd_ac97), GFP_KERNEL);
+ if (ac97 == NULL)
+ return ERR_PTR(-ENOMEM);
+
+ ac97->dev = adev->dev;
+ ac97->private_data = adev;
+ ac97->bus = &compat_soc_ac97_bus;
+ return ac97;
+}
+EXPORT_SYMBOL_GPL(snd_ac97_compat_alloc);
+
+void snd_ac97_compat_release(struct snd_ac97 *ac97)
+{
+ kfree(ac97);
+}
+EXPORT_SYMBOL_GPL(snd_ac97_compat_release);
+
+int snd_ac97_reset(struct snd_ac97 *ac97, bool try_warm, unsigned int id,
+ unsigned int id_mask)
+{
+ struct ac97_codec_device *adev = to_ac97_device(ac97->private_data);
+ struct ac97_controller *actrl = adev->ac97_ctrl;
+ unsigned int scanned;
+
+ if (try_warm) {
+ compat_ac97_warm_reset(ac97);
+ scanned = snd_ac97_bus_scan_one(actrl, adev->num);
+ if (ac97_ids_match(scanned, adev->vendor_id, id_mask))
+ return 1;
+ }
+
+ compat_ac97_reset(ac97);
+ compat_ac97_warm_reset(ac97);
+ scanned = snd_ac97_bus_scan_one(actrl, adev->num);
+ if (ac97_ids_match(scanned, adev->vendor_id, id_mask))
+ return 0;
+
+ return -ENODEV;
+}
+EXPORT_SYMBOL_GPL(snd_ac97_reset);
--
2.14.1
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