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AC97 is a bus for sound usage. It enables for a AC97 AC-Link to link one controller to 0 to 4 AC97 codecs. The goal of this new implementation is to implement a device/driver model for AC97, with an automatic scan of the bus and automatic discovery of AC97 codec devices. Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr> Reviewed-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Mark Brown <broonie@kernel.org>
108 lines
2.8 KiB
C
108 lines
2.8 KiB
C
/*
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* Copyright (C) 2016 Robert Jarzmik <robert.jarzmik@free.fr>
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <sound/ac97/codec.h>
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#include <sound/ac97/compat.h>
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#include <sound/ac97/controller.h>
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#include <sound/soc.h>
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#include "ac97_core.h"
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static void compat_ac97_reset(struct snd_ac97 *ac97)
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{
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struct ac97_codec_device *adev = to_ac97_device(ac97->private_data);
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struct ac97_controller *actrl = adev->ac97_ctrl;
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if (actrl->ops->reset)
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actrl->ops->reset(actrl);
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}
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static void compat_ac97_warm_reset(struct snd_ac97 *ac97)
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{
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struct ac97_codec_device *adev = to_ac97_device(ac97->private_data);
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struct ac97_controller *actrl = adev->ac97_ctrl;
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if (actrl->ops->warm_reset)
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actrl->ops->warm_reset(actrl);
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}
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static void compat_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
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unsigned short val)
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{
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struct ac97_codec_device *adev = to_ac97_device(ac97->private_data);
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struct ac97_controller *actrl = adev->ac97_ctrl;
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actrl->ops->write(actrl, ac97->num, reg, val);
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}
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static unsigned short compat_ac97_read(struct snd_ac97 *ac97,
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unsigned short reg)
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{
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struct ac97_codec_device *adev = to_ac97_device(ac97->private_data);
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struct ac97_controller *actrl = adev->ac97_ctrl;
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return actrl->ops->read(actrl, ac97->num, reg);
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}
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static struct snd_ac97_bus_ops compat_snd_ac97_bus_ops = {
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.reset = compat_ac97_reset,
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.warm_reset = compat_ac97_warm_reset,
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.write = compat_ac97_write,
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.read = compat_ac97_read,
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};
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static struct snd_ac97_bus compat_soc_ac97_bus = {
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.ops = &compat_snd_ac97_bus_ops,
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};
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struct snd_ac97 *snd_ac97_compat_alloc(struct ac97_codec_device *adev)
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{
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struct snd_ac97 *ac97;
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ac97 = kzalloc(sizeof(struct snd_ac97), GFP_KERNEL);
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if (ac97 == NULL)
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return ERR_PTR(-ENOMEM);
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ac97->dev = adev->dev;
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ac97->private_data = adev;
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ac97->bus = &compat_soc_ac97_bus;
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return ac97;
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}
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EXPORT_SYMBOL_GPL(snd_ac97_compat_alloc);
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void snd_ac97_compat_release(struct snd_ac97 *ac97)
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{
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kfree(ac97);
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}
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EXPORT_SYMBOL_GPL(snd_ac97_compat_release);
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int snd_ac97_reset(struct snd_ac97 *ac97, bool try_warm, unsigned int id,
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unsigned int id_mask)
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{
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struct ac97_codec_device *adev = to_ac97_device(ac97->private_data);
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struct ac97_controller *actrl = adev->ac97_ctrl;
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unsigned int scanned;
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if (try_warm) {
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compat_ac97_warm_reset(ac97);
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scanned = snd_ac97_bus_scan_one(actrl, adev->num);
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if (ac97_ids_match(scanned, adev->vendor_id, id_mask))
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return 1;
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}
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compat_ac97_reset(ac97);
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compat_ac97_warm_reset(ac97);
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scanned = snd_ac97_bus_scan_one(actrl, adev->num);
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if (ac97_ids_match(scanned, adev->vendor_id, id_mask))
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return 0;
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return -ENODEV;
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}
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EXPORT_SYMBOL_GPL(snd_ac97_reset);
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