ALSA: ac97: Constify snd_ac97_bus_ops definitions
[muen/linux.git] / sound / ac97 / snd_ac97_compat.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *  Copyright (C) 2016 Robert Jarzmik <robert.jarzmik@free.fr>
4  */
5
6 #include <linux/list.h>
7 #include <linux/slab.h>
8 #include <sound/ac97/codec.h>
9 #include <sound/ac97/compat.h>
10 #include <sound/ac97/controller.h>
11 #include <sound/soc.h>
12
13 #include "ac97_core.h"
14
15 static void compat_ac97_release(struct device *dev)
16 {
17         kfree(to_ac97_t(dev));
18 }
19
20 static void compat_ac97_reset(struct snd_ac97 *ac97)
21 {
22         struct ac97_codec_device *adev = to_ac97_device(ac97->private_data);
23         struct ac97_controller *actrl = adev->ac97_ctrl;
24
25         if (actrl->ops->reset)
26                 actrl->ops->reset(actrl);
27 }
28
29 static void compat_ac97_warm_reset(struct snd_ac97 *ac97)
30 {
31         struct ac97_codec_device *adev = to_ac97_device(ac97->private_data);
32         struct ac97_controller *actrl = adev->ac97_ctrl;
33
34         if (actrl->ops->warm_reset)
35                 actrl->ops->warm_reset(actrl);
36 }
37
38 static void compat_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
39                               unsigned short val)
40 {
41         struct ac97_codec_device *adev = to_ac97_device(ac97->private_data);
42         struct ac97_controller *actrl = adev->ac97_ctrl;
43
44         actrl->ops->write(actrl, ac97->num, reg, val);
45 }
46
47 static unsigned short compat_ac97_read(struct snd_ac97 *ac97,
48                                        unsigned short reg)
49 {
50         struct ac97_codec_device *adev = to_ac97_device(ac97->private_data);
51         struct ac97_controller *actrl = adev->ac97_ctrl;
52
53         return actrl->ops->read(actrl, ac97->num, reg);
54 }
55
56 static const struct snd_ac97_bus_ops compat_snd_ac97_bus_ops = {
57         .reset = compat_ac97_reset,
58         .warm_reset = compat_ac97_warm_reset,
59         .write = compat_ac97_write,
60         .read = compat_ac97_read,
61 };
62
63 static struct snd_ac97_bus compat_soc_ac97_bus = {
64         .ops = &compat_snd_ac97_bus_ops,
65 };
66
67 struct snd_ac97 *snd_ac97_compat_alloc(struct ac97_codec_device *adev)
68 {
69         struct snd_ac97 *ac97;
70         int ret;
71
72         ac97 = kzalloc(sizeof(struct snd_ac97), GFP_KERNEL);
73         if (ac97 == NULL)
74                 return ERR_PTR(-ENOMEM);
75
76         ac97->private_data = adev;
77         ac97->bus = &compat_soc_ac97_bus;
78
79         ac97->dev.parent = &adev->dev;
80         ac97->dev.release = compat_ac97_release;
81         dev_set_name(&ac97->dev, "%s-compat", dev_name(&adev->dev));
82         ret = device_register(&ac97->dev);
83         if (ret) {
84                 put_device(&ac97->dev);
85                 return ERR_PTR(ret);
86         }
87
88         return ac97;
89 }
90 EXPORT_SYMBOL_GPL(snd_ac97_compat_alloc);
91
92 void snd_ac97_compat_release(struct snd_ac97 *ac97)
93 {
94         device_unregister(&ac97->dev);
95 }
96 EXPORT_SYMBOL_GPL(snd_ac97_compat_release);
97
98 int snd_ac97_reset(struct snd_ac97 *ac97, bool try_warm, unsigned int id,
99         unsigned int id_mask)
100 {
101         struct ac97_codec_device *adev = to_ac97_device(ac97->private_data);
102         struct ac97_controller *actrl = adev->ac97_ctrl;
103         unsigned int scanned;
104
105         if (try_warm) {
106                 compat_ac97_warm_reset(ac97);
107                 scanned = snd_ac97_bus_scan_one(actrl, adev->num);
108                 if (ac97_ids_match(scanned, adev->vendor_id, id_mask))
109                         return 1;
110         }
111
112         compat_ac97_reset(ac97);
113         compat_ac97_warm_reset(ac97);
114         scanned = snd_ac97_bus_scan_one(actrl, adev->num);
115         if (ac97_ids_match(scanned, adev->vendor_id, id_mask))
116                 return 0;
117
118         return -ENODEV;
119 }
120 EXPORT_SYMBOL_GPL(snd_ac97_reset);