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ALSA: hdac: Add API for removing hdac extended device
[karo-tx-linux.git] / 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);