xref: /openbmc/linux/sound/ac97/snd_ac97_compat.c (revision 7effbd18)
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);
121