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// SPDX-License-Identifier: GPL-2.0
/*
* UAC3 Power Domain state management functions
*/
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/usb/audio.h>
#include <linux/usb/audio-v2.h>
#include <linux/usb/audio-v3.h>
#include "usbaudio.h"
#include "helper.h"
#include "power.h"
struct snd_usb_power_domain *
snd_usb_find_power_domain(struct usb_host_interface *ctrl_iface,
unsigned char id)
{
struct snd_usb_power_domain *pd;
void *p;
pd = kzalloc(sizeof(*pd), GFP_KERNEL);
if (!pd)
return NULL;
p = NULL;
while ((p = snd_usb_find_csint_desc(ctrl_iface->extra,
ctrl_iface->extralen,
p, UAC3_POWER_DOMAIN)) != NULL) {
struct uac3_power_domain_descriptor *pd_desc = p;
int i;
if (!snd_usb_validate_audio_desc(p, UAC_VERSION_3))
continue;
for (i = 0; i < pd_desc->bNrEntities; i++) {
if (pd_desc->baEntityID[i] == id) {
pd->pd_id = pd_desc->bPowerDomainID;
pd->pd_d1d0_rec =
le16_to_cpu(pd_desc->waRecoveryTime1);
pd->pd_d2d0_rec =
le16_to_cpu(pd_desc->waRecoveryTime2);
return pd;
}
}
}
kfree(pd);
return NULL;
}
int snd_usb_power_domain_set(struct snd_usb_audio *chip,
struct snd_usb_power_domain *pd,
unsigned char state)
{
struct usb_device *dev = chip->dev;
unsigned char current_state;
int err, idx;
idx = snd_usb_ctrl_intf(chip) | (pd->pd_id << 8);
err = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0),
UAC2_CS_CUR,
USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
UAC3_AC_POWER_DOMAIN_CONTROL << 8, idx,
¤t_state, sizeof(current_state));
if (err < 0) {
dev_err(&dev->dev, "Can't get UAC3 power state for id %d\n",
pd->pd_id);
return err;
}
if (current_state == state) {
dev_dbg(&dev->dev, "UAC3 power domain id %d already in state %d\n",
pd->pd_id, state);
return 0;
}
err = snd_usb_ctl_msg(chip->dev, usb_sndctrlpipe(chip->dev, 0), UAC2_CS_CUR,
USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
UAC3_AC_POWER_DOMAIN_CONTROL << 8, idx,
&state, sizeof(state));
if (err < 0) {
dev_err(&dev->dev, "Can't set UAC3 power state to %d for id %d\n",
state, pd->pd_id);
return err;
}
if (state == UAC3_PD_STATE_D0) {
switch (current_state) {
case UAC3_PD_STATE_D2:
udelay(pd->pd_d2d0_rec * 50);
break;
case UAC3_PD_STATE_D1:
udelay(pd->pd_d1d0_rec * 50);
break;
default:
return -EINVAL;
}
}
dev_dbg(&dev->dev, "UAC3 power domain id %d change to state %d\n",
pd->pd_id, state);
return 0;
}
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