1// SPDX-License-Identifier: GPL-2.0
2/*
3 *   UAC3 Power Domain state management functions
4 */
5
6#include <linux/slab.h>
7#include <linux/usb.h>
8#include <linux/usb/audio.h>
9#include <linux/usb/audio-v2.h>
10#include <linux/usb/audio-v3.h>
11
12#include "usbaudio.h"
13#include "helper.h"
14#include "power.h"
15
16struct snd_usb_power_domain *
17snd_usb_find_power_domain(struct usb_host_interface *ctrl_iface,
18			  unsigned char id)
19{
20	struct snd_usb_power_domain *pd;
21	void *p;
22
23	pd = kzalloc(sizeof(*pd), GFP_KERNEL);
24	if (!pd)
25		return NULL;
26
27	p = NULL;
28	while ((p = snd_usb_find_csint_desc(ctrl_iface->extra,
29					    ctrl_iface->extralen,
30					    p, UAC3_POWER_DOMAIN)) != NULL) {
31		struct uac3_power_domain_descriptor *pd_desc = p;
32		int i;
33
34		if (!snd_usb_validate_audio_desc(p, UAC_VERSION_3))
35			continue;
36		for (i = 0; i < pd_desc->bNrEntities; i++) {
37			if (pd_desc->baEntityID[i] == id) {
38				pd->pd_id = pd_desc->bPowerDomainID;
39				pd->pd_d1d0_rec =
40					le16_to_cpu(pd_desc->waRecoveryTime1);
41				pd->pd_d2d0_rec =
42					le16_to_cpu(pd_desc->waRecoveryTime2);
43				return pd;
44			}
45		}
46	}
47
48	kfree(pd);
49	return NULL;
50}
51
52int snd_usb_power_domain_set(struct snd_usb_audio *chip,
53			     struct snd_usb_power_domain *pd,
54			     unsigned char state)
55{
56	struct usb_device *dev = chip->dev;
57	unsigned char current_state;
58	int err, idx;
59
60	idx = snd_usb_ctrl_intf(chip) | (pd->pd_id << 8);
61
62	err = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0),
63			      UAC2_CS_CUR,
64			      USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
65			      UAC3_AC_POWER_DOMAIN_CONTROL << 8, idx,
66			      &current_state, sizeof(current_state));
67	if (err < 0) {
68		dev_err(&dev->dev, "Can't get UAC3 power state for id %d\n",
69			pd->pd_id);
70		return err;
71	}
72
73	if (current_state == state) {
74		dev_dbg(&dev->dev, "UAC3 power domain id %d already in state %d\n",
75			pd->pd_id, state);
76		return 0;
77	}
78
79	err = snd_usb_ctl_msg(chip->dev, usb_sndctrlpipe(chip->dev, 0), UAC2_CS_CUR,
80			      USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
81			      UAC3_AC_POWER_DOMAIN_CONTROL << 8, idx,
82			      &state, sizeof(state));
83	if (err < 0) {
84		dev_err(&dev->dev, "Can't set UAC3 power state to %d for id %d\n",
85			state, pd->pd_id);
86		return err;
87	}
88
89	if (state == UAC3_PD_STATE_D0) {
90		switch (current_state) {
91		case UAC3_PD_STATE_D2:
92			udelay(pd->pd_d2d0_rec * 50);
93			break;
94		case UAC3_PD_STATE_D1:
95			udelay(pd->pd_d1d0_rec * 50);
96			break;
97		default:
98			return -EINVAL;
99		}
100	}
101
102	dev_dbg(&dev->dev, "UAC3 power domain id %d change to state %d\n",
103		pd->pd_id, state);
104
105	return 0;
106}
107