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/*
* 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 <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++;
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(*hdev), GFP_KERNEL);
if (!edev)
return -ENOMEM;
hdev = &edev->hdac;
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);
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