sound/hda/ext/hdac_ext_bus.c

   1 /*
   2  *  hdac-ext-bus.c - HD-audio extended core bus functions.
   3  *
   4  *  Copyright (C) 2014-2015 Intel Corp
   5  *  Author: Jeeja KP <jeeja.kp@intel.com>
   6  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; version 2 of the License.
  11  *
  12  *  This program is distributed in the hope that it will be useful, but
  13  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  *  General Public License for more details.
  16  *
  17  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/slab.h>
  22 #include <sound/hdaudio_ext.h>
  23
  24 MODULE_DESCRIPTION("HDA extended core");
  25 MODULE_LICENSE("GPL v2");
  26
  27 static void hdac_ext_writel(u32 value, u32 __iomem *addr)
  28 {
  29         writel(value, addr);
  30 }
  31
  32 static u32 hdac_ext_readl(u32 __iomem *addr)
  33 {
  34         return readl(addr);
  35 }
  36
  37 static void hdac_ext_writew(u16 value, u16 __iomem *addr)
  38 {
  39         writew(value, addr);
  40 }
  41
  42 static u16 hdac_ext_readw(u16 __iomem *addr)
  43 {
  44         return readw(addr);
  45 }
  46
  47 static void hdac_ext_writeb(u8 value, u8 __iomem *addr)
  48 {
  49         writeb(value, addr);
  50 }
  51
  52 static u8 hdac_ext_readb(u8 __iomem *addr)
  53 {
  54         return readb(addr);
  55 }
  56
  57 static int hdac_ext_dma_alloc_pages(struct hdac_bus *bus, int type,
  58                            size_t size, struct snd_dma_buffer *buf)
  59 {
  60         return snd_dma_alloc_pages(type, bus->dev, size, buf);
  61 }
  62
  63 static void hdac_ext_dma_free_pages(struct hdac_bus *bus, struct snd_dma_buffer *buf)
  64 {
  65         snd_dma_free_pages(buf);
  66 }
  67
  68 static const struct hdac_io_ops hdac_ext_default_io = {
  69         .reg_writel = hdac_ext_writel,
  70         .reg_readl = hdac_ext_readl,
  71         .reg_writew = hdac_ext_writew,
  72         .reg_readw = hdac_ext_readw,
  73         .reg_writeb = hdac_ext_writeb,
  74         .reg_readb = hdac_ext_readb,
  75         .dma_alloc_pages = hdac_ext_dma_alloc_pages,
  76         .dma_free_pages = hdac_ext_dma_free_pages,
  77 };
  78
  79 /**
  80  * snd_hdac_ext_bus_init - initialize a HD-audio extended bus
  81  * @ebus: the pointer to extended bus object
  82  * @dev: device pointer
  83  * @ops: bus verb operators
  84  * @io_ops: lowlevel I/O operators, can be NULL. If NULL core will use
  85  * default ops
  86  *
  87  * Returns 0 if successful, or a negative error code.
  88  */
  89 int snd_hdac_ext_bus_init(struct hdac_ext_bus *ebus, struct device *dev,
  90                         const struct hdac_bus_ops *ops,
  91                         const struct hdac_io_ops *io_ops)
  92 {
  93         int ret;
  94         static int idx;
  95
  96         /* check if io ops are provided, if not load the defaults */
  97         if (io_ops == NULL)
  98                 io_ops = &hdac_ext_default_io;
  99
 100         ret = snd_hdac_bus_init(&ebus->bus, dev, ops, io_ops);
 101         if (ret < 0)
 102                 return ret;
 103
 104         INIT_LIST_HEAD(&ebus->hlink_list);
 105         ebus->idx = idx++;
 106
 107         return 0;
 108 }
 109 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_init);
 110
 111 /**
 112  * snd_hdac_ext_bus_exit - clean up a HD-audio extended bus
 113  * @ebus: the pointer to extended bus object
 114  */
 115 void snd_hdac_ext_bus_exit(struct hdac_ext_bus *ebus)
 116 {
 117         snd_hdac_bus_exit(&ebus->bus);
 118         WARN_ON(!list_empty(&ebus->hlink_list));
 119 }
 120 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_exit);
 121
 122 static void default_release(struct device *dev)
 123 {
 124         snd_hdac_ext_bus_device_exit(container_of(dev, struct hdac_device, dev));
 125 }
 126
 127 /**
 128  * snd_hdac_ext_device_init - initialize the HDA extended codec base device
 129  * @ebus: hdac extended bus to attach to
 130  * @addr: codec address
 131  *
 132  * Returns zero for success or a negative error code.
 133  */
 134 int snd_hdac_ext_bus_device_init(struct hdac_ext_bus *ebus, int addr)
 135 {
 136         struct hdac_device *hdev = NULL;
 137         struct hdac_bus *bus = ebus_to_hbus(ebus);
 138         char name[15];
 139         int ret;
 140
 141         hdev = kzalloc(sizeof(*hdev), GFP_KERNEL);
 142         if (!hdev)
 143                 return -ENOMEM;
 144
 145         snprintf(name, sizeof(name), "ehdaudio%dD%d", ebus->idx, addr);
 146
 147         ret  = snd_hdac_device_init(hdev, bus, name, addr);
 148         if (ret < 0) {
 149                 dev_err(bus->dev, "device init failed for hdac device\n");
 150                 return ret;
 151         }
 152         hdev->type = HDA_DEV_ASOC;
 153         hdev->dev.release = default_release;
 154
 155         ret = snd_hdac_device_register(hdev);
 156         if (ret) {
 157                 dev_err(bus->dev, "failed to register hdac device\n");
 158                 snd_hdac_ext_bus_device_exit(hdev);
 159                 return ret;
 160         }
 161         return 0;
 162 }
 163 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_init);
 164
 165 /**
 166  * snd_hdac_ext_bus_device_exit - clean up a HD-audio extended codec base device
 167  * @hdev: hdac device to clean up
 168  */
 169 void snd_hdac_ext_bus_device_exit(struct hdac_device *hdev)
 170 {
 171         snd_hdac_device_exit(hdev);
 172         kfree(hdev);
 173 }
 174 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_exit);
 175
 176 /**
 177  * snd_hdac_ext_bus_device_remove - remove HD-audio extended codec base devices
 178  *
 179  * @ebus: HD-audio extended bus
 180  */
 181 void snd_hdac_ext_bus_device_remove(struct hdac_ext_bus *ebus)
 182 {
 183         struct hdac_device *codec, *__codec;
 184         /*
 185          * we need to remove all the codec devices objects created in the
 186          * snd_hdac_ext_bus_device_init
 187          */
 188         list_for_each_entry_safe(codec, __codec, &ebus->bus.codec_list, list) {
 189                 snd_hdac_device_unregister(codec);
 190                 put_device(&codec->dev);
 191         }
 192 }
 193 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_remove);