mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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1c82ed1bc5
Use a private array for TLV entries of virtual master controls instead of (supposed) static array. This cleans up the existing codes. Also, now vmaster assumes the simple dB-range TLV that is the only type it can handle. Signed-off-by: Takashi Iwai <tiwai@suse.de>
372 lines
9.3 KiB
C
372 lines
9.3 KiB
C
/*
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* Virtual master and slave controls
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*
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* Copyright (c) 2008 by Takashi Iwai <tiwai@suse.de>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2.
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*
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*/
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#include <linux/slab.h>
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#include <sound/core.h>
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#include <sound/control.h>
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#include <sound/tlv.h>
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/*
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* a subset of information returned via ctl info callback
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*/
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struct link_ctl_info {
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int type; /* value type */
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int count; /* item count */
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int min_val, max_val; /* min, max values */
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};
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/*
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* link master - this contains a list of slave controls that are
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* identical types, i.e. info returns the same value type and value
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* ranges, but may have different number of counts.
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*
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* The master control is so far only mono volume/switch for simplicity.
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* The same value will be applied to all slaves.
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*/
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struct link_master {
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struct list_head slaves;
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struct link_ctl_info info;
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int val; /* the master value */
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unsigned int tlv[4];
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};
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/*
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* link slave - this contains a slave control element
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*
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* It fakes the control callbacsk with additional attenuation by the
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* master control. A slave may have either one or two channels.
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*/
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struct link_slave {
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struct list_head list;
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struct link_master *master;
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struct link_ctl_info info;
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int vals[2]; /* current values */
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struct snd_kcontrol slave; /* the copy of original control entry */
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};
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/* get the slave ctl info and save the initial values */
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static int slave_init(struct link_slave *slave)
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{
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struct snd_ctl_elem_info *uinfo;
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struct snd_ctl_elem_value *uctl;
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int err, ch;
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if (slave->info.count)
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return 0; /* already initialized */
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uinfo = kmalloc(sizeof(*uinfo), GFP_KERNEL);
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if (!uinfo)
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return -ENOMEM;
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uinfo->id = slave->slave.id;
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err = slave->slave.info(&slave->slave, uinfo);
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if (err < 0) {
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kfree(uinfo);
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return err;
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}
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slave->info.type = uinfo->type;
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slave->info.count = uinfo->count;
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if (slave->info.count > 2 ||
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(slave->info.type != SNDRV_CTL_ELEM_TYPE_INTEGER &&
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slave->info.type != SNDRV_CTL_ELEM_TYPE_BOOLEAN)) {
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snd_printk(KERN_ERR "invalid slave element\n");
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kfree(uinfo);
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return -EINVAL;
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}
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slave->info.min_val = uinfo->value.integer.min;
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slave->info.max_val = uinfo->value.integer.max;
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kfree(uinfo);
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uctl = kmalloc(sizeof(*uctl), GFP_KERNEL);
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if (!uctl)
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return -ENOMEM;
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uctl->id = slave->slave.id;
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err = slave->slave.get(&slave->slave, uctl);
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for (ch = 0; ch < slave->info.count; ch++)
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slave->vals[ch] = uctl->value.integer.value[ch];
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kfree(uctl);
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return 0;
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}
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/* initialize master volume */
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static int master_init(struct link_master *master)
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{
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struct link_slave *slave;
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if (master->info.count)
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return 0; /* already initialized */
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list_for_each_entry(slave, &master->slaves, list) {
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int err = slave_init(slave);
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if (err < 0)
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return err;
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master->info = slave->info;
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master->info.count = 1; /* always mono */
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/* set full volume as default (= no attenuation) */
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master->val = master->info.max_val;
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return 0;
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}
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return -ENOENT;
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}
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static int slave_get_val(struct link_slave *slave,
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struct snd_ctl_elem_value *ucontrol)
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{
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int err, ch;
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err = slave_init(slave);
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if (err < 0)
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return err;
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for (ch = 0; ch < slave->info.count; ch++)
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ucontrol->value.integer.value[ch] = slave->vals[ch];
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return 0;
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}
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static int slave_put_val(struct link_slave *slave,
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struct snd_ctl_elem_value *ucontrol)
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{
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int err, ch, vol;
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err = master_init(slave->master);
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if (err < 0)
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return err;
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switch (slave->info.type) {
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case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
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for (ch = 0; ch < slave->info.count; ch++)
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ucontrol->value.integer.value[ch] &=
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!!slave->master->val;
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break;
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case SNDRV_CTL_ELEM_TYPE_INTEGER:
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for (ch = 0; ch < slave->info.count; ch++) {
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/* max master volume is supposed to be 0 dB */
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vol = ucontrol->value.integer.value[ch];
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vol += slave->master->val - slave->master->info.max_val;
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if (vol < slave->info.min_val)
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vol = slave->info.min_val;
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else if (vol > slave->info.max_val)
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vol = slave->info.max_val;
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ucontrol->value.integer.value[ch] = vol;
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}
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break;
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}
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return slave->slave.put(&slave->slave, ucontrol);
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}
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/*
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* ctl callbacks for slaves
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*/
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static int slave_info(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_info *uinfo)
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{
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struct link_slave *slave = snd_kcontrol_chip(kcontrol);
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return slave->slave.info(&slave->slave, uinfo);
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}
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static int slave_get(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct link_slave *slave = snd_kcontrol_chip(kcontrol);
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return slave_get_val(slave, ucontrol);
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}
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static int slave_put(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct link_slave *slave = snd_kcontrol_chip(kcontrol);
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int err, ch, changed = 0;
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err = slave_init(slave);
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if (err < 0)
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return err;
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for (ch = 0; ch < slave->info.count; ch++) {
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if (slave->vals[ch] != ucontrol->value.integer.value[ch]) {
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changed = 1;
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slave->vals[ch] = ucontrol->value.integer.value[ch];
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}
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}
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if (!changed)
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return 0;
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return slave_put_val(slave, ucontrol);
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}
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static int slave_tlv_cmd(struct snd_kcontrol *kcontrol,
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int op_flag, unsigned int size,
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unsigned int __user *tlv)
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{
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struct link_slave *slave = snd_kcontrol_chip(kcontrol);
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/* FIXME: this assumes that the max volume is 0 dB */
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return slave->slave.tlv.c(&slave->slave, op_flag, size, tlv);
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}
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static void slave_free(struct snd_kcontrol *kcontrol)
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{
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struct link_slave *slave = snd_kcontrol_chip(kcontrol);
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if (slave->slave.private_free)
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slave->slave.private_free(&slave->slave);
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if (slave->master)
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list_del(&slave->list);
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kfree(slave);
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}
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/*
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* Add a slave control to the group with the given master control
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*
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* All slaves must be the same type (returning the same information
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* via info callback). The fucntion doesn't check it, so it's your
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* responsibility.
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*
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* Also, some additional limitations:
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* - at most two channels
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* - logarithmic volume control (dB level), no linear volume
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* - master can only attenuate the volume, no gain
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*/
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int snd_ctl_add_slave(struct snd_kcontrol *master, struct snd_kcontrol *slave)
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{
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struct link_master *master_link = snd_kcontrol_chip(master);
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struct link_slave *srec;
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srec = kzalloc(sizeof(*srec) +
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slave->count * sizeof(*slave->vd), GFP_KERNEL);
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if (!srec)
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return -ENOMEM;
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srec->slave = *slave;
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memcpy(srec->slave.vd, slave->vd, slave->count * sizeof(*slave->vd));
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srec->master = master_link;
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/* override callbacks */
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slave->info = slave_info;
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slave->get = slave_get;
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slave->put = slave_put;
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if (slave->vd[0].access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK)
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slave->tlv.c = slave_tlv_cmd;
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slave->private_data = srec;
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slave->private_free = slave_free;
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list_add_tail(&srec->list, &master_link->slaves);
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return 0;
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}
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EXPORT_SYMBOL(snd_ctl_add_slave);
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/*
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* ctl callbacks for master controls
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*/
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static int master_info(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_info *uinfo)
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{
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struct link_master *master = snd_kcontrol_chip(kcontrol);
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int ret;
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ret = master_init(master);
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if (ret < 0)
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return ret;
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uinfo->type = master->info.type;
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uinfo->count = master->info.count;
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uinfo->value.integer.min = master->info.min_val;
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uinfo->value.integer.max = master->info.max_val;
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return 0;
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}
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static int master_get(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct link_master *master = snd_kcontrol_chip(kcontrol);
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int err = master_init(master);
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if (err < 0)
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return err;
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ucontrol->value.integer.value[0] = master->val;
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return 0;
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}
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static int master_put(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct link_master *master = snd_kcontrol_chip(kcontrol);
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struct link_slave *slave;
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struct snd_ctl_elem_value *uval;
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int err, old_val;
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err = master_init(master);
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if (err < 0)
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return err;
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old_val = master->val;
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if (ucontrol->value.integer.value[0] == old_val)
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return 0;
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uval = kmalloc(sizeof(*uval), GFP_KERNEL);
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if (!uval)
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return -ENOMEM;
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list_for_each_entry(slave, &master->slaves, list) {
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master->val = old_val;
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uval->id = slave->slave.id;
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slave_get_val(slave, uval);
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master->val = ucontrol->value.integer.value[0];
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slave_put_val(slave, uval);
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}
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kfree(uval);
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return 1;
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}
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static void master_free(struct snd_kcontrol *kcontrol)
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{
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struct link_master *master = snd_kcontrol_chip(kcontrol);
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struct link_slave *slave;
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list_for_each_entry(slave, &master->slaves, list)
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slave->master = NULL;
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kfree(master);
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}
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/*
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* Create a virtual master control with the given name
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*/
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struct snd_kcontrol *snd_ctl_make_virtual_master(char *name,
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const unsigned int *tlv)
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{
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struct link_master *master;
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struct snd_kcontrol *kctl;
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struct snd_kcontrol_new knew;
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memset(&knew, 0, sizeof(knew));
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knew.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
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knew.name = name;
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knew.info = master_info;
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master = kzalloc(sizeof(*master), GFP_KERNEL);
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if (!master)
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return NULL;
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INIT_LIST_HEAD(&master->slaves);
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kctl = snd_ctl_new1(&knew, master);
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if (!kctl) {
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kfree(master);
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return NULL;
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}
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/* override some callbacks */
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kctl->info = master_info;
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kctl->get = master_get;
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kctl->put = master_put;
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kctl->private_free = master_free;
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/* additional (constant) TLV read */
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if (tlv && tlv[0] == SNDRV_CTL_TLVT_DB_SCALE) {
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kctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_TLV_READ;
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memcpy(master->tlv, tlv, sizeof(master->tlv));
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kctl->tlv.p = master->tlv;
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}
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return kctl;
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}
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EXPORT_SYMBOL(snd_ctl_make_virtual_master);
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