1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * UAC3 Power Domain state management functions
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun #include <linux/slab.h>
7*4882a593Smuzhiyun #include <linux/usb.h>
8*4882a593Smuzhiyun #include <linux/usb/audio.h>
9*4882a593Smuzhiyun #include <linux/usb/audio-v2.h>
10*4882a593Smuzhiyun #include <linux/usb/audio-v3.h>
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #include "usbaudio.h"
13*4882a593Smuzhiyun #include "helper.h"
14*4882a593Smuzhiyun #include "power.h"
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun struct snd_usb_power_domain *
snd_usb_find_power_domain(struct usb_host_interface * ctrl_iface,unsigned char id)17*4882a593Smuzhiyun snd_usb_find_power_domain(struct usb_host_interface *ctrl_iface,
18*4882a593Smuzhiyun unsigned char id)
19*4882a593Smuzhiyun {
20*4882a593Smuzhiyun struct snd_usb_power_domain *pd;
21*4882a593Smuzhiyun void *p;
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun pd = kzalloc(sizeof(*pd), GFP_KERNEL);
24*4882a593Smuzhiyun if (!pd)
25*4882a593Smuzhiyun return NULL;
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun p = NULL;
28*4882a593Smuzhiyun while ((p = snd_usb_find_csint_desc(ctrl_iface->extra,
29*4882a593Smuzhiyun ctrl_iface->extralen,
30*4882a593Smuzhiyun p, UAC3_POWER_DOMAIN)) != NULL) {
31*4882a593Smuzhiyun struct uac3_power_domain_descriptor *pd_desc = p;
32*4882a593Smuzhiyun int i;
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun if (!snd_usb_validate_audio_desc(p, UAC_VERSION_3))
35*4882a593Smuzhiyun continue;
36*4882a593Smuzhiyun for (i = 0; i < pd_desc->bNrEntities; i++) {
37*4882a593Smuzhiyun if (pd_desc->baEntityID[i] == id) {
38*4882a593Smuzhiyun pd->pd_id = pd_desc->bPowerDomainID;
39*4882a593Smuzhiyun pd->pd_d1d0_rec =
40*4882a593Smuzhiyun le16_to_cpu(pd_desc->waRecoveryTime1);
41*4882a593Smuzhiyun pd->pd_d2d0_rec =
42*4882a593Smuzhiyun le16_to_cpu(pd_desc->waRecoveryTime2);
43*4882a593Smuzhiyun return pd;
44*4882a593Smuzhiyun }
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun }
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun kfree(pd);
49*4882a593Smuzhiyun return NULL;
50*4882a593Smuzhiyun }
51*4882a593Smuzhiyun
snd_usb_power_domain_set(struct snd_usb_audio * chip,struct snd_usb_power_domain * pd,unsigned char state)52*4882a593Smuzhiyun int snd_usb_power_domain_set(struct snd_usb_audio *chip,
53*4882a593Smuzhiyun struct snd_usb_power_domain *pd,
54*4882a593Smuzhiyun unsigned char state)
55*4882a593Smuzhiyun {
56*4882a593Smuzhiyun struct usb_device *dev = chip->dev;
57*4882a593Smuzhiyun unsigned char current_state;
58*4882a593Smuzhiyun int err, idx;
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun idx = snd_usb_ctrl_intf(chip) | (pd->pd_id << 8);
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun err = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0),
63*4882a593Smuzhiyun UAC2_CS_CUR,
64*4882a593Smuzhiyun USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
65*4882a593Smuzhiyun UAC3_AC_POWER_DOMAIN_CONTROL << 8, idx,
66*4882a593Smuzhiyun ¤t_state, sizeof(current_state));
67*4882a593Smuzhiyun if (err < 0) {
68*4882a593Smuzhiyun dev_err(&dev->dev, "Can't get UAC3 power state for id %d\n",
69*4882a593Smuzhiyun pd->pd_id);
70*4882a593Smuzhiyun return err;
71*4882a593Smuzhiyun }
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun if (current_state == state) {
74*4882a593Smuzhiyun dev_dbg(&dev->dev, "UAC3 power domain id %d already in state %d\n",
75*4882a593Smuzhiyun pd->pd_id, state);
76*4882a593Smuzhiyun return 0;
77*4882a593Smuzhiyun }
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun err = snd_usb_ctl_msg(chip->dev, usb_sndctrlpipe(chip->dev, 0), UAC2_CS_CUR,
80*4882a593Smuzhiyun USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
81*4882a593Smuzhiyun UAC3_AC_POWER_DOMAIN_CONTROL << 8, idx,
82*4882a593Smuzhiyun &state, sizeof(state));
83*4882a593Smuzhiyun if (err < 0) {
84*4882a593Smuzhiyun dev_err(&dev->dev, "Can't set UAC3 power state to %d for id %d\n",
85*4882a593Smuzhiyun state, pd->pd_id);
86*4882a593Smuzhiyun return err;
87*4882a593Smuzhiyun }
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun if (state == UAC3_PD_STATE_D0) {
90*4882a593Smuzhiyun switch (current_state) {
91*4882a593Smuzhiyun case UAC3_PD_STATE_D2:
92*4882a593Smuzhiyun udelay(pd->pd_d2d0_rec * 50);
93*4882a593Smuzhiyun break;
94*4882a593Smuzhiyun case UAC3_PD_STATE_D1:
95*4882a593Smuzhiyun udelay(pd->pd_d1d0_rec * 50);
96*4882a593Smuzhiyun break;
97*4882a593Smuzhiyun default:
98*4882a593Smuzhiyun return -EINVAL;
99*4882a593Smuzhiyun }
100*4882a593Smuzhiyun }
101*4882a593Smuzhiyun
102*4882a593Smuzhiyun dev_dbg(&dev->dev, "UAC3 power domain id %d change to state %d\n",
103*4882a593Smuzhiyun pd->pd_id, state);
104*4882a593Smuzhiyun
105*4882a593Smuzhiyun return 0;
106*4882a593Smuzhiyun }
107