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