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authorJorge Sanjuan <jorge.sanjuan@codethink.co.uk>2018-07-31 15:28:42 +0300
committerTakashi Iwai <tiwai@suse.de>2018-07-31 16:01:22 +0300
commit11785ef53228d23ec386f5fe4a34601536f0c891 (patch)
treeecdf75859e73b7671550204c42d1dd6949bb8288 /sound/usb
parent89b4ab213feb11a5bece544cfa12374f66c2c47c (diff)
downloadlinux-11785ef53228d23ec386f5fe4a34601536f0c891.tar.xz
ALSA: usb-audio: Initial Power Domain support
Thee USB Audio Class 3 (UAC3) introduces Power Domains as a new feature to let a host turn individual parts of an audio function to different power states via USB requests. This lets the device get to know a bit amore about what the host is up to in order to optimize power consumption efficiently. The Power Domains are optional for UAC3 configuration but all UAC3 devices shall include at least one BADD configuration where the support for Power Domains is compulsory. This patch adds a set of features/helpers to parse these power domains and change their status. Signed-off-by: Jorge Sanjuan <jorge.sanjuan@codethink.co.uk> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb')
-rw-r--r--sound/usb/Makefile1
-rw-r--r--sound/usb/power.c104
-rw-r--r--sound/usb/power.h19
3 files changed, 124 insertions, 0 deletions
diff --git a/sound/usb/Makefile b/sound/usb/Makefile
index 05440e2df8d9..d330f74c90e6 100644
--- a/sound/usb/Makefile
+++ b/sound/usb/Makefile
@@ -13,6 +13,7 @@ snd-usb-audio-objs := card.o \
mixer_scarlett.o \
mixer_us16x08.o \
pcm.o \
+ power.o \
proc.o \
quirks.o \
stream.o
diff --git a/sound/usb/power.c b/sound/usb/power.c
new file mode 100644
index 000000000000..bd303a1ba1b7
--- /dev/null
+++ b/sound/usb/power.c
@@ -0,0 +1,104 @@
+// 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;
+
+ 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,
+ &current_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;
+}
diff --git a/sound/usb/power.h b/sound/usb/power.h
index b2e25f60c5a2..6004231a7c75 100644
--- a/sound/usb/power.h
+++ b/sound/usb/power.h
@@ -2,6 +2,25 @@
#ifndef __USBAUDIO_POWER_H
#define __USBAUDIO_POWER_H
+struct snd_usb_power_domain {
+ int pd_id; /* UAC3 Power Domain ID */
+ int pd_d1d0_rec; /* D1 to D0 recovery time */
+ int pd_d2d0_rec; /* D2 to D0 recovery time */
+};
+
+enum {
+ UAC3_PD_STATE_D0,
+ UAC3_PD_STATE_D1,
+ UAC3_PD_STATE_D2,
+};
+
+int snd_usb_power_domain_set(struct snd_usb_audio *chip,
+ struct snd_usb_power_domain *pd,
+ unsigned char state);
+struct snd_usb_power_domain *
+snd_usb_find_power_domain(struct usb_host_interface *ctrl_iface,
+ unsigned char id);
+
#ifdef CONFIG_PM
int snd_usb_autoresume(struct snd_usb_audio *chip);
void snd_usb_autosuspend(struct snd_usb_audio *chip);