270 lines
6.7 KiB
C
270 lines
6.7 KiB
C
/*
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* hdac-ext-bus.c - HD-audio extended core bus functions.
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*
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* Copyright (C) 2014-2015 Intel Corp
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* Author: Jeeja KP <jeeja.kp@intel.com>
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <sound/hdaudio_ext.h>
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MODULE_DESCRIPTION("HDA extended core");
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MODULE_LICENSE("GPL v2");
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static void hdac_ext_writel(u32 value, u32 __iomem *addr)
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{
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writel(value, addr);
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}
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static u32 hdac_ext_readl(u32 __iomem *addr)
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{
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return readl(addr);
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}
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static void hdac_ext_writew(u16 value, u16 __iomem *addr)
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{
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writew(value, addr);
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}
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static u16 hdac_ext_readw(u16 __iomem *addr)
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{
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return readw(addr);
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}
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static void hdac_ext_writeb(u8 value, u8 __iomem *addr)
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{
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writeb(value, addr);
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}
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static u8 hdac_ext_readb(u8 __iomem *addr)
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{
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return readb(addr);
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}
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static int hdac_ext_dma_alloc_pages(struct hdac_bus *bus, int type,
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size_t size, struct snd_dma_buffer *buf)
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{
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return snd_dma_alloc_pages(type, bus->dev, size, buf);
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}
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static void hdac_ext_dma_free_pages(struct hdac_bus *bus, struct snd_dma_buffer *buf)
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{
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snd_dma_free_pages(buf);
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}
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static const struct hdac_io_ops hdac_ext_default_io = {
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.reg_writel = hdac_ext_writel,
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.reg_readl = hdac_ext_readl,
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.reg_writew = hdac_ext_writew,
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.reg_readw = hdac_ext_readw,
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.reg_writeb = hdac_ext_writeb,
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.reg_readb = hdac_ext_readb,
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.dma_alloc_pages = hdac_ext_dma_alloc_pages,
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.dma_free_pages = hdac_ext_dma_free_pages,
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};
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/**
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* snd_hdac_ext_bus_init - initialize a HD-audio extended bus
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* @ebus: the pointer to extended bus object
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* @dev: device pointer
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* @ops: bus verb operators
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* @io_ops: lowlevel I/O operators, can be NULL. If NULL core will use
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* default ops
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*
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* Returns 0 if successful, or a negative error code.
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*/
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int snd_hdac_ext_bus_init(struct hdac_ext_bus *ebus, struct device *dev,
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const struct hdac_bus_ops *ops,
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const struct hdac_io_ops *io_ops)
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{
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int ret;
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static int idx;
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/* check if io ops are provided, if not load the defaults */
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if (io_ops == NULL)
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io_ops = &hdac_ext_default_io;
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ret = snd_hdac_bus_init(&ebus->bus, dev, ops, io_ops);
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if (ret < 0)
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return ret;
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INIT_LIST_HEAD(&ebus->hlink_list);
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ebus->idx = idx++;
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mutex_init(&ebus->lock);
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ebus->cmd_dma_state = true;
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return 0;
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}
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EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_init);
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/**
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* snd_hdac_ext_bus_exit - clean up a HD-audio extended bus
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* @ebus: the pointer to extended bus object
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*/
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void snd_hdac_ext_bus_exit(struct hdac_ext_bus *ebus)
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{
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snd_hdac_bus_exit(&ebus->bus);
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WARN_ON(!list_empty(&ebus->hlink_list));
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}
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EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_exit);
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static void default_release(struct device *dev)
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{
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snd_hdac_ext_bus_device_exit(container_of(dev, struct hdac_device, dev));
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}
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/**
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* snd_hdac_ext_bus_device_init - initialize the HDA extended codec base device
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* @ebus: hdac extended bus to attach to
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* @addr: codec address
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*
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* Returns zero for success or a negative error code.
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*/
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int snd_hdac_ext_bus_device_init(struct hdac_ext_bus *ebus, int addr)
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{
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struct hdac_ext_device *edev;
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struct hdac_device *hdev = NULL;
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struct hdac_bus *bus = ebus_to_hbus(ebus);
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char name[15];
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int ret;
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edev = kzalloc(sizeof(*edev), GFP_KERNEL);
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if (!edev)
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return -ENOMEM;
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hdev = &edev->hdev;
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edev->ebus = ebus;
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snprintf(name, sizeof(name), "ehdaudio%dD%d", ebus->idx, addr);
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ret = snd_hdac_device_init(hdev, bus, name, addr);
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if (ret < 0) {
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dev_err(bus->dev, "device init failed for hdac device\n");
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return ret;
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}
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hdev->type = HDA_DEV_ASOC;
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hdev->dev.release = default_release;
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ret = snd_hdac_device_register(hdev);
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if (ret) {
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dev_err(bus->dev, "failed to register hdac device\n");
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snd_hdac_ext_bus_device_exit(hdev);
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return ret;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_init);
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/**
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* snd_hdac_ext_bus_device_exit - clean up a HD-audio extended codec base device
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* @hdev: hdac device to clean up
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*/
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void snd_hdac_ext_bus_device_exit(struct hdac_device *hdev)
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{
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struct hdac_ext_device *edev = to_ehdac_device(hdev);
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snd_hdac_device_exit(hdev);
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kfree(edev);
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}
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EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_exit);
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/**
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* snd_hdac_ext_bus_device_remove - remove HD-audio extended codec base devices
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*
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* @ebus: HD-audio extended bus
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*/
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void snd_hdac_ext_bus_device_remove(struct hdac_ext_bus *ebus)
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{
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struct hdac_device *codec, *__codec;
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/*
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* we need to remove all the codec devices objects created in the
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* snd_hdac_ext_bus_device_init
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*/
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list_for_each_entry_safe(codec, __codec, &ebus->bus.codec_list, list) {
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snd_hdac_device_unregister(codec);
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put_device(&codec->dev);
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}
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}
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EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_remove);
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#define dev_to_hdac(dev) (container_of((dev), \
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struct hdac_device, dev))
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static inline struct hdac_ext_driver *get_edrv(struct device *dev)
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{
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struct hdac_driver *hdrv = drv_to_hdac_driver(dev->driver);
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struct hdac_ext_driver *edrv = to_ehdac_driver(hdrv);
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return edrv;
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}
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static inline struct hdac_ext_device *get_edev(struct device *dev)
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{
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struct hdac_device *hdev = dev_to_hdac_dev(dev);
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struct hdac_ext_device *edev = to_ehdac_device(hdev);
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return edev;
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}
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static int hda_ext_drv_probe(struct device *dev)
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{
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return (get_edrv(dev))->probe(get_edev(dev));
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}
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static int hdac_ext_drv_remove(struct device *dev)
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{
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return (get_edrv(dev))->remove(get_edev(dev));
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}
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static void hdac_ext_drv_shutdown(struct device *dev)
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{
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return (get_edrv(dev))->shutdown(get_edev(dev));
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}
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/**
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* snd_hda_ext_driver_register - register a driver for ext hda devices
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*
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* @drv: ext hda driver structure
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*/
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int snd_hda_ext_driver_register(struct hdac_ext_driver *drv)
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{
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drv->hdac.type = HDA_DEV_ASOC;
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drv->hdac.driver.bus = &snd_hda_bus_type;
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/* we use default match */
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if (drv->probe)
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drv->hdac.driver.probe = hda_ext_drv_probe;
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if (drv->remove)
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drv->hdac.driver.remove = hdac_ext_drv_remove;
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if (drv->shutdown)
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drv->hdac.driver.shutdown = hdac_ext_drv_shutdown;
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return driver_register(&drv->hdac.driver);
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}
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EXPORT_SYMBOL_GPL(snd_hda_ext_driver_register);
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/**
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* snd_hda_ext_driver_unregister - unregister a driver for ext hda devices
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*
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* @drv: ext hda driver structure
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*/
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void snd_hda_ext_driver_unregister(struct hdac_ext_driver *drv)
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{
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driver_unregister(&drv->hdac.driver);
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}
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EXPORT_SYMBOL_GPL(snd_hda_ext_driver_unregister);
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