sound/hda/ext/hdac_ext_bus.c - third_party/linux - Git at Google

 /*
  *  hdac-ext-bus.c - HD-audio extended core bus functions.
  *
  *  Copyright (C) 2014-2015 Intel Corp
  *  Author: Jeeja KP <jeeja.kp@intel.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; version 2 of the License.
  *
  *  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.
  *
  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  */

 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/io.h>
 #include <sound/hdaudio_ext.h>

 MODULE_DESCRIPTION("HDA extended core");
 MODULE_LICENSE("GPL v2");

 static void hdac_ext_writel(u32 value, u32 __iomem *addr)
 {
 	writel(value, addr);
 }

 static u32 hdac_ext_readl(u32 __iomem *addr)
 {
 	return readl(addr);
 }

 static void hdac_ext_writew(u16 value, u16 __iomem *addr)
 {
 	writew(value, addr);
 }

 static u16 hdac_ext_readw(u16 __iomem *addr)
 {
 	return readw(addr);
 }

 static void hdac_ext_writeb(u8 value, u8 __iomem *addr)
 {
 	writeb(value, addr);
 }

 static u8 hdac_ext_readb(u8 __iomem *addr)
 {
 	return readb(addr);
 }

 static int hdac_ext_dma_alloc_pages(struct hdac_bus *bus, int type,
 			   size_t size, struct snd_dma_buffer *buf)
 {
 	return snd_dma_alloc_pages(type, bus->dev, size, buf);
 }

 static void hdac_ext_dma_free_pages(struct hdac_bus *bus, struct snd_dma_buffer *buf)
 {
 	snd_dma_free_pages(buf);
 }

 static const struct hdac_io_ops hdac_ext_default_io = {
 	.reg_writel = hdac_ext_writel,
 	.reg_readl = hdac_ext_readl,
 	.reg_writew = hdac_ext_writew,
 	.reg_readw = hdac_ext_readw,
 	.reg_writeb = hdac_ext_writeb,
 	.reg_readb = hdac_ext_readb,
 	.dma_alloc_pages = hdac_ext_dma_alloc_pages,
 	.dma_free_pages = hdac_ext_dma_free_pages,
 };

 /**
  * snd_hdac_ext_bus_init - initialize a HD-audio extended bus
  * @ebus: the pointer to extended bus object
  * @dev: device pointer
  * @ops: bus verb operators
  * @io_ops: lowlevel I/O operators, can be NULL. If NULL core will use
  * default ops
  *
  * Returns 0 if successful, or a negative error code.
  */
 int snd_hdac_ext_bus_init(struct hdac_ext_bus *ebus, struct device *dev,
 			const struct hdac_bus_ops *ops,
 			const struct hdac_io_ops *io_ops)
 {
 	int ret;
 	static int idx;

 	/* check if io ops are provided, if not load the defaults */
 	if (io_ops == NULL)
 		io_ops = &hdac_ext_default_io;

 	ret = snd_hdac_bus_init(&ebus->bus, dev, ops, io_ops);
 	if (ret < 0)
 		return ret;

 	INIT_LIST_HEAD(&ebus->hlink_list);
 	ebus->idx = idx++;

 	mutex_init(&ebus->lock);
 	ebus->cmd_dma_state = true;

 	return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_init);

 /**
  * snd_hdac_ext_bus_exit - clean up a HD-audio extended bus
  * @ebus: the pointer to extended bus object
  */
 void snd_hdac_ext_bus_exit(struct hdac_ext_bus *ebus)
 {
 	snd_hdac_bus_exit(&ebus->bus);
 	WARN_ON(!list_empty(&ebus->hlink_list));
 }
 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_exit);

 static void default_release(struct device *dev)
 {
 	snd_hdac_ext_bus_device_exit(container_of(dev, struct hdac_device, dev));
 }

 /**
  * snd_hdac_ext_bus_device_init - initialize the HDA extended codec base device
  * @ebus: hdac extended bus to attach to
  * @addr: codec address
  *
  * Returns zero for success or a negative error code.
  */
 int snd_hdac_ext_bus_device_init(struct hdac_ext_bus *ebus, int addr)
 {
 	struct hdac_ext_device *edev;
 	struct hdac_device *hdev = NULL;
 	struct hdac_bus *bus = ebus_to_hbus(ebus);
 	char name[15];
 	int ret;

 	edev = kzalloc(sizeof(*edev), GFP_KERNEL);
 	if (!edev)
 		return -ENOMEM;
 	hdev = &edev->hdev;
 	edev->ebus = ebus;

 	snprintf(name, sizeof(name), "ehdaudio%dD%d", ebus->idx, addr);

 	ret  = snd_hdac_device_init(hdev, bus, name, addr);
 	if (ret < 0) {
 		dev_err(bus->dev, "device init failed for hdac device\n");
 		return ret;
 	}
 	hdev->type = HDA_DEV_ASOC;
 	hdev->dev.release = default_release;

 	ret = snd_hdac_device_register(hdev);
 	if (ret) {
 		dev_err(bus->dev, "failed to register hdac device\n");
 		snd_hdac_ext_bus_device_exit(hdev);
 		return ret;
 	}

 	return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_init);

 /**
  * snd_hdac_ext_bus_device_exit - clean up a HD-audio extended codec base device
  * @hdev: hdac device to clean up
  */
 void snd_hdac_ext_bus_device_exit(struct hdac_device *hdev)
 {
 	struct hdac_ext_device *edev = to_ehdac_device(hdev);

 	snd_hdac_device_exit(hdev);
 	kfree(edev);
 }
 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_exit);

 /**
  * snd_hdac_ext_bus_device_remove - remove HD-audio extended codec base devices
  *
  * @ebus: HD-audio extended bus
  */
 void snd_hdac_ext_bus_device_remove(struct hdac_ext_bus *ebus)
 {
 	struct hdac_device *codec, *__codec;
 	/*
 	 * we need to remove all the codec devices objects created in the
 	 * snd_hdac_ext_bus_device_init
 	 */
 	list_for_each_entry_safe(codec, __codec, &ebus->bus.codec_list, list) {
 		snd_hdac_device_unregister(codec);
 		put_device(&codec->dev);
 	}
 }
 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_remove);
 #define dev_to_hdac(dev) (container_of((dev), \
 			struct hdac_device, dev))

 static inline struct hdac_ext_driver *get_edrv(struct device *dev)
 {
 	struct hdac_driver *hdrv = drv_to_hdac_driver(dev->driver);
 	struct hdac_ext_driver *edrv = to_ehdac_driver(hdrv);

 	return edrv;
 }

 static inline struct hdac_ext_device *get_edev(struct device *dev)
 {
 	struct hdac_device *hdev = dev_to_hdac_dev(dev);
 	struct hdac_ext_device *edev = to_ehdac_device(hdev);

 	return edev;
 }

 static int hda_ext_drv_probe(struct device *dev)
 {
 	return (get_edrv(dev))->probe(get_edev(dev));
 }

 static int hdac_ext_drv_remove(struct device *dev)
 {
 	return (get_edrv(dev))->remove(get_edev(dev));
 }

 static void hdac_ext_drv_shutdown(struct device *dev)
 {
 	return (get_edrv(dev))->shutdown(get_edev(dev));
 }

 /**
  * snd_hda_ext_driver_register - register a driver for ext hda devices
  *
  * @drv: ext hda driver structure
  */
 int snd_hda_ext_driver_register(struct hdac_ext_driver *drv)
 {
 	drv->hdac.type = HDA_DEV_ASOC;
 	drv->hdac.driver.bus = &snd_hda_bus_type;
 	/* we use default match */

 	if (drv->probe)
 		drv->hdac.driver.probe = hda_ext_drv_probe;
 	if (drv->remove)
 		drv->hdac.driver.remove = hdac_ext_drv_remove;
 	if (drv->shutdown)
 		drv->hdac.driver.shutdown = hdac_ext_drv_shutdown;

 	return driver_register(&drv->hdac.driver);
 }
 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_register);

 /**
  * snd_hda_ext_driver_unregister - unregister a driver for ext hda devices
  *
  * @drv: ext hda driver structure
  */
 void snd_hda_ext_driver_unregister(struct hdac_ext_driver *drv)
 {
 	driver_unregister(&drv->hdac.driver);
 }
 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_unregister);
	/*
	* hdac-ext-bus.c - HD-audio extended core bus functions.
	*
	* Copyright (C) 2014-2015 Intel Corp
	* Author: Jeeja KP <jeeja.kp@intel.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; version 2 of the License.
	*
	* 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.
	*
	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	*/

	#include <linux/module.h>
	#include <linux/slab.h>
	#include <linux/io.h>
	#include <sound/hdaudio_ext.h>

	MODULE_DESCRIPTION("HDA extended core");
	MODULE_LICENSE("GPL v2");

	static void hdac_ext_writel(u32 value, u32 __iomem *addr)
	{
	writel(value, addr);
	}

	static u32 hdac_ext_readl(u32 __iomem *addr)
	{
	return readl(addr);
	}

	static void hdac_ext_writew(u16 value, u16 __iomem *addr)
	{
	writew(value, addr);
	}

	static u16 hdac_ext_readw(u16 __iomem *addr)
	{
	return readw(addr);
	}

	static void hdac_ext_writeb(u8 value, u8 __iomem *addr)
	{
	writeb(value, addr);
	}

	static u8 hdac_ext_readb(u8 __iomem *addr)
	{
	return readb(addr);
	}

	static int hdac_ext_dma_alloc_pages(struct hdac_bus *bus, int type,
	size_t size, struct snd_dma_buffer *buf)
	{
	return snd_dma_alloc_pages(type, bus->dev, size, buf);
	}

	static void hdac_ext_dma_free_pages(struct hdac_bus bus, struct snd_dma_buffer buf)
	{
	snd_dma_free_pages(buf);
	}

	static const struct hdac_io_ops hdac_ext_default_io = {
	.reg_writel = hdac_ext_writel,
	.reg_readl = hdac_ext_readl,
	.reg_writew = hdac_ext_writew,
	.reg_readw = hdac_ext_readw,
	.reg_writeb = hdac_ext_writeb,
	.reg_readb = hdac_ext_readb,
	.dma_alloc_pages = hdac_ext_dma_alloc_pages,
	.dma_free_pages = hdac_ext_dma_free_pages,
	};

	/**
	* snd_hdac_ext_bus_init - initialize a HD-audio extended bus
	* @ebus: the pointer to extended bus object
	* @dev: device pointer
	* @ops: bus verb operators
	* @io_ops: lowlevel I/O operators, can be NULL. If NULL core will use
	* default ops
	*
	* Returns 0 if successful, or a negative error code.
	*/
	int snd_hdac_ext_bus_init(struct hdac_ext_bus ebus, struct device dev,
	const struct hdac_bus_ops *ops,
	const struct hdac_io_ops *io_ops)
	{
	int ret;
	static int idx;

	/* check if io ops are provided, if not load the defaults */
	if (io_ops == NULL)
	io_ops = &hdac_ext_default_io;

	ret = snd_hdac_bus_init(&ebus->bus, dev, ops, io_ops);
	if (ret < 0)
	return ret;

	INIT_LIST_HEAD(&ebus->hlink_list);
	ebus->idx = idx++;

	mutex_init(&ebus->lock);
	ebus->cmd_dma_state = true;

	return 0;
	}
	EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_init);

	/**
	* snd_hdac_ext_bus_exit - clean up a HD-audio extended bus
	* @ebus: the pointer to extended bus object
	*/
	void snd_hdac_ext_bus_exit(struct hdac_ext_bus *ebus)
	{
	snd_hdac_bus_exit(&ebus->bus);
	WARN_ON(!list_empty(&ebus->hlink_list));
	}
	EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_exit);

	static void default_release(struct device *dev)
	{
	snd_hdac_ext_bus_device_exit(container_of(dev, struct hdac_device, dev));
	}

	/**
	* snd_hdac_ext_bus_device_init - initialize the HDA extended codec base device
	* @ebus: hdac extended bus to attach to
	* @addr: codec address
	*
	* Returns zero for success or a negative error code.
	*/
	int snd_hdac_ext_bus_device_init(struct hdac_ext_bus *ebus, int addr)
	{
	struct hdac_ext_device *edev;
	struct hdac_device *hdev = NULL;
	struct hdac_bus *bus = ebus_to_hbus(ebus);
	char name[15];
	int ret;

	edev = kzalloc(sizeof(*edev), GFP_KERNEL);
	if (!edev)
	return -ENOMEM;
	hdev = &edev->hdev;
	edev->ebus = ebus;

	snprintf(name, sizeof(name), "ehdaudio%dD%d", ebus->idx, addr);

	ret = snd_hdac_device_init(hdev, bus, name, addr);
	if (ret < 0) {
	dev_err(bus->dev, "device init failed for hdac device\n");
	return ret;
	}
	hdev->type = HDA_DEV_ASOC;
	hdev->dev.release = default_release;

	ret = snd_hdac_device_register(hdev);
	if (ret) {
	dev_err(bus->dev, "failed to register hdac device\n");
	snd_hdac_ext_bus_device_exit(hdev);
	return ret;
	}

	return 0;
	}
	EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_init);

	/**
	* snd_hdac_ext_bus_device_exit - clean up a HD-audio extended codec base device
	* @hdev: hdac device to clean up
	*/
	void snd_hdac_ext_bus_device_exit(struct hdac_device *hdev)
	{
	struct hdac_ext_device *edev = to_ehdac_device(hdev);

	snd_hdac_device_exit(hdev);
	kfree(edev);
	}
	EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_exit);

	/**
	* snd_hdac_ext_bus_device_remove - remove HD-audio extended codec base devices
	*
	* @ebus: HD-audio extended bus
	*/
	void snd_hdac_ext_bus_device_remove(struct hdac_ext_bus *ebus)
	{
	struct hdac_device codec, __codec;
	/*
	* we need to remove all the codec devices objects created in the
	* snd_hdac_ext_bus_device_init
	*/
	list_for_each_entry_safe(codec, __codec, &ebus->bus.codec_list, list) {
	snd_hdac_device_unregister(codec);
	put_device(&codec->dev);
	}
	}
	EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_remove);
	#define dev_to_hdac(dev) (container_of((dev), \
	struct hdac_device, dev))

	static inline struct hdac_ext_driver get_edrv(struct device dev)
	{
	struct hdac_driver *hdrv = drv_to_hdac_driver(dev->driver);
	struct hdac_ext_driver *edrv = to_ehdac_driver(hdrv);

	return edrv;
	}

	static inline struct hdac_ext_device get_edev(struct device dev)
	{
	struct hdac_device *hdev = dev_to_hdac_dev(dev);
	struct hdac_ext_device *edev = to_ehdac_device(hdev);

	return edev;
	}

	static int hda_ext_drv_probe(struct device *dev)
	{
	return (get_edrv(dev))->probe(get_edev(dev));
	}

	static int hdac_ext_drv_remove(struct device *dev)
	{
	return (get_edrv(dev))->remove(get_edev(dev));
	}

	static void hdac_ext_drv_shutdown(struct device *dev)
	{
	return (get_edrv(dev))->shutdown(get_edev(dev));
	}

	/**
	* snd_hda_ext_driver_register - register a driver for ext hda devices
	*
	* @drv: ext hda driver structure
	*/
	int snd_hda_ext_driver_register(struct hdac_ext_driver *drv)
	{
	drv->hdac.type = HDA_DEV_ASOC;
	drv->hdac.driver.bus = &snd_hda_bus_type;
	/* we use default match */

	if (drv->probe)
	drv->hdac.driver.probe = hda_ext_drv_probe;
	if (drv->remove)
	drv->hdac.driver.remove = hdac_ext_drv_remove;
	if (drv->shutdown)
	drv->hdac.driver.shutdown = hdac_ext_drv_shutdown;

	return driver_register(&drv->hdac.driver);
	}
	EXPORT_SYMBOL_GPL(snd_hda_ext_driver_register);

	/**
	* snd_hda_ext_driver_unregister - unregister a driver for ext hda devices
	*
	* @drv: ext hda driver structure
	*/
	void snd_hda_ext_driver_unregister(struct hdac_ext_driver *drv)
	{
	driver_unregister(&drv->hdac.driver);
	}
	EXPORT_SYMBOL_GPL(snd_hda_ext_driver_unregister);