* [PATCH v3 0/3] USB Audio Gadget refactoring
@ 2016-08-17 20:49 Ruslan Bilovol
2016-08-17 20:49 ` [PATCH v3 1/3] usb: gadget: f_uac2: remove platform driver/device creation Ruslan Bilovol
` (3 more replies)
0 siblings, 4 replies; 6+ messages in thread
From: Ruslan Bilovol @ 2016-08-17 20:49 UTC (permalink / raw)
To: Felipe Balbi
Cc: Daniel Mack, Jassi Brar, Clemens Ladisch, Jonathan Corbet,
Greg Kroah-Hartman, Peter Chen, linux-usb, linux-doc,
linux-kernel
I came to this patch series when wanted to do two things:
- use UAC1 as virtual ALSA sound card on gadget side,
just like UAC2 is used so it's possible to do rate
resampling
- have both playback/capture support in UAC1
Since I wanted to have same behavior for both UAC1/UAC2,
obviously I've got an utility part (u_audio.c) for
virtual ALSA sound card handling like we have
for ethernet(u_ether) or serial(u_serial) functions.
Function-specific parts (f_uac1/f_uac2) became almost
as storage for class-specific USB descriptors, some
boilerplate for configfs, binding and few USB
config request handling.
Originally in RFC [1] I've posted before, there was
major change to f_uac1 after that it couldn't do
direct play to existing ALSA sound card anymore,
representing audio on gadget side as virtual
ALSA sound card where audio streams are simply
sinked to and sourced from it, so it may break
current usecase for some people (and that's why
it was RFC).
During RFC discussion, it was agreed to not touch
existing f_uac1 implementation and create new one
instead. This patchset (v2) introduced new function
named f_uac1_newapi and doesn't touch current f_uac1
implementation, so people still can use old behavior
Now, it's possible to use existing user-space
applications for audio routing between Audio Gadget
and real sound card. I personally use alsaloop tool
from alsautils and have ability to create PCM
loopback between two different ALSA cards using
rate resampling, which was not possible with previous
"direct play to ALSA card" approach in f_uac1.
While here, also dropped redundant platform
driver/device creation in f_uac2 driver (as well as
didn't add "never implemented" volume/mute functionality
in f_uac1 to f_uac1_newapi) that made this work even
easier to do.
This series is tested with both legacy g_audio.ko and
modern configfs approaches under Ubuntu 14.04 (UAC1 and
UAC2) and under Windows7 x64 (UAC1 only) having
perfect results in all cases.
Comments, testing are welcome.
v3 changes:
- renamed u_audio exported symbols so they don't
conflict with old f_uac1 if both are built-in.
v2 changes:
- do not touch f_uac1, instead created f_uac1_newapi
- added documentation for f_uac1_newapi
- rebased on top of v4.8-rc1
[1] https://lkml.org/lkml/2016/5/23/649
Ruslan Bilovol (3):
usb: gadget: f_uac2: remove platform driver/device creation
usb: gadget: f_uac2: split out audio core
usb: gadget: add f_uac1 variant based on new u_audio api
.../ABI/testing/configfs-usb-gadget-uac1_newapi | 12 +
Documentation/usb/gadget-testing.txt | 41 ++
drivers/usb/gadget/Kconfig | 25 +
drivers/usb/gadget/function/Makefile | 3 +
drivers/usb/gadget/function/f_uac1_newapi.c | 795 +++++++++++++++++++++
drivers/usb/gadget/function/f_uac2.c | 778 +++-----------------
drivers/usb/gadget/function/u_audio.c | 632 ++++++++++++++++
drivers/usb/gadget/function/u_audio.h | 93 +++
drivers/usb/gadget/function/u_uac1_newapi.h | 39 +
drivers/usb/gadget/legacy/Kconfig | 14 +-
drivers/usb/gadget/legacy/audio.c | 52 ++
11 files changed, 1801 insertions(+), 683 deletions(-)
create mode 100644 Documentation/ABI/testing/configfs-usb-gadget-uac1_newapi
create mode 100644 drivers/usb/gadget/function/f_uac1_newapi.c
create mode 100644 drivers/usb/gadget/function/u_audio.c
create mode 100644 drivers/usb/gadget/function/u_audio.h
create mode 100644 drivers/usb/gadget/function/u_uac1_newapi.h
--
1.9.1
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH v3 1/3] usb: gadget: f_uac2: remove platform driver/device creation
2016-08-17 20:49 [PATCH v3 0/3] USB Audio Gadget refactoring Ruslan Bilovol
@ 2016-08-17 20:49 ` Ruslan Bilovol
2016-08-17 20:49 ` [PATCH v3 2/3] usb: gadget: f_uac2: split out audio core Ruslan Bilovol
` (2 subsequent siblings)
3 siblings, 0 replies; 6+ messages in thread
From: Ruslan Bilovol @ 2016-08-17 20:49 UTC (permalink / raw)
To: Felipe Balbi
Cc: Daniel Mack, Jassi Brar, Clemens Ladisch, Jonathan Corbet,
Greg Kroah-Hartman, Peter Chen, linux-usb, linux-doc,
linux-kernel
Simplify f_uac2 by removing platform driver/device
creation; use composite's usb_gadget device as
parent for sound card and for debug prints.
This removes extra layer of code without any functional
change.
Signed-off-by: Ruslan Bilovol <ruslan.bilovol@gmail.com>
---
drivers/usb/gadget/function/f_uac2.c | 107 +++++++++--------------------------
1 file changed, 28 insertions(+), 79 deletions(-)
diff --git a/drivers/usb/gadget/function/f_uac2.c b/drivers/usb/gadget/function/f_uac2.c
index cd214ec8..e14628c 100644
--- a/drivers/usb/gadget/function/f_uac2.c
+++ b/drivers/usb/gadget/function/f_uac2.c
@@ -13,7 +13,6 @@
#include <linux/usb/audio.h>
#include <linux/usb/audio-v2.h>
-#include <linux/platform_device.h>
#include <linux/module.h>
#include <sound/core.h>
@@ -54,8 +53,6 @@
#define UNFLW_CTRL 8
#define OVFLW_CTRL 10
-static const char *uac2_name = "snd_uac2";
-
struct uac2_req {
struct uac2_rtd_params *pp; /* parent param */
struct usb_request *req;
@@ -84,9 +81,6 @@ struct uac2_rtd_params {
};
struct snd_uac2_chip {
- struct platform_device pdev;
- struct platform_driver pdrv;
-
struct uac2_rtd_params p_prm;
struct uac2_rtd_params c_prm;
@@ -125,6 +119,7 @@ struct audio_dev {
struct usb_ep *in_ep, *out_ep;
struct usb_function func;
+ struct usb_gadget *gadget;
/* The ALSA Sound Card it represents on the USB-Client side */
struct snd_uac2_chip uac2;
@@ -143,12 +138,6 @@ struct audio_dev *uac2_to_agdev(struct snd_uac2_chip *u)
}
static inline
-struct snd_uac2_chip *pdev_to_uac2(struct platform_device *p)
-{
- return container_of(p, struct snd_uac2_chip, pdev);
-}
-
-static inline
struct f_uac2_opts *agdev_to_uac2_opts(struct audio_dev *agdev)
{
return container_of(agdev->func.fi, struct f_uac2_opts, func_inst);
@@ -257,7 +246,7 @@ agdev_iso_complete(struct usb_ep *ep, struct usb_request *req)
exit:
if (usb_ep_queue(ep, req, GFP_ATOMIC))
- dev_err(&uac2->pdev.dev, "%d Error!\n", __LINE__);
+ dev_err(uac2->card->dev, "%d Error!\n", __LINE__);
if (update_alsa)
snd_pcm_period_elapsed(substream);
@@ -441,23 +430,22 @@ static struct snd_pcm_ops uac2_pcm_ops = {
.prepare = uac2_pcm_null,
};
-static int snd_uac2_probe(struct platform_device *pdev)
+static int snd_uac2_probe(struct audio_dev *audio_dev)
{
- struct snd_uac2_chip *uac2 = pdev_to_uac2(pdev);
+ struct snd_uac2_chip *uac2 = &audio_dev->uac2;
struct snd_card *card;
struct snd_pcm *pcm;
- struct audio_dev *audio_dev;
struct f_uac2_opts *opts;
int err;
int p_chmask, c_chmask;
- audio_dev = uac2_to_agdev(uac2);
opts = container_of(audio_dev->func.fi, struct f_uac2_opts, func_inst);
p_chmask = opts->p_chmask;
c_chmask = opts->c_chmask;
/* Choose any slot, with no id */
- err = snd_card_new(&pdev->dev, -1, NULL, THIS_MODULE, 0, &card);
+ err = snd_card_new(&audio_dev->gadget->dev,
+ -1, NULL, THIS_MODULE, 0, &card);
if (err < 0)
return err;
@@ -482,16 +470,15 @@ static int snd_uac2_probe(struct platform_device *pdev)
strcpy(card->driver, "UAC2_Gadget");
strcpy(card->shortname, "UAC2_Gadget");
- sprintf(card->longname, "UAC2_Gadget %i", pdev->id);
+ sprintf(card->longname, "UAC2_Gadget %i", card->dev->id);
snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
snd_dma_continuous_data(GFP_KERNEL), 0, BUFF_SIZE_MAX);
err = snd_card_register(card);
- if (!err) {
- platform_set_drvdata(pdev, card);
+
+ if (!err)
return 0;
- }
snd_fail:
snd_card_free(card);
@@ -502,9 +489,9 @@ snd_fail:
return err;
}
-static int snd_uac2_remove(struct platform_device *pdev)
+static int snd_uac2_remove(struct audio_dev *audio_dev)
{
- struct snd_card *card = platform_get_drvdata(pdev);
+ struct snd_card *card = audio_dev->uac2.card;
if (card)
return snd_card_free(card);
@@ -512,45 +499,6 @@ static int snd_uac2_remove(struct platform_device *pdev)
return 0;
}
-static void snd_uac2_release(struct device *dev)
-{
- dev_dbg(dev, "releasing '%s'\n", dev_name(dev));
-}
-
-static int alsa_uac2_init(struct audio_dev *agdev)
-{
- struct snd_uac2_chip *uac2 = &agdev->uac2;
- int err;
-
- uac2->pdrv.probe = snd_uac2_probe;
- uac2->pdrv.remove = snd_uac2_remove;
- uac2->pdrv.driver.name = uac2_name;
-
- uac2->pdev.id = 0;
- uac2->pdev.name = uac2_name;
- uac2->pdev.dev.release = snd_uac2_release;
-
- /* Register snd_uac2 driver */
- err = platform_driver_register(&uac2->pdrv);
- if (err)
- return err;
-
- /* Register snd_uac2 device */
- err = platform_device_register(&uac2->pdev);
- if (err)
- platform_driver_unregister(&uac2->pdrv);
-
- return err;
-}
-
-static void alsa_uac2_exit(struct audio_dev *agdev)
-{
- struct snd_uac2_chip *uac2 = &agdev->uac2;
-
- platform_driver_unregister(&uac2->pdrv);
- platform_device_unregister(&uac2->pdev);
-}
-
/* --------- USB Function Interface ------------- */
@@ -959,7 +907,7 @@ free_ep(struct uac2_rtd_params *prm, struct usb_ep *ep)
}
if (usb_ep_disable(ep))
- dev_err(&uac2->pdev.dev,
+ dev_err(uac2->card->dev,
"%s:%d Error!\n", __func__, __LINE__);
}
@@ -993,7 +941,7 @@ afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
struct snd_uac2_chip *uac2 = &agdev->uac2;
struct usb_composite_dev *cdev = cfg->cdev;
struct usb_gadget *gadget = cdev->gadget;
- struct device *dev = &uac2->pdev.dev;
+ struct device *dev = &gadget->dev;
struct uac2_rtd_params *prm;
struct f_uac2_opts *uac2_opts;
struct usb_string *us;
@@ -1064,6 +1012,8 @@ afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
agdev->as_in_intf = ret;
agdev->as_in_alt = 0;
+ agdev->gadget = gadget;
+
agdev->out_ep = usb_ep_autoconfig(gadget, &fs_epout_desc);
if (!agdev->out_ep) {
dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
@@ -1109,7 +1059,7 @@ afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
goto err_free_descs;
}
- ret = alsa_uac2_init(agdev);
+ ret = snd_uac2_probe(agdev);
if (ret)
goto err_free_descs;
return 0;
@@ -1119,6 +1069,7 @@ err_free_descs:
err:
kfree(agdev->uac2.p_prm.rbuf);
kfree(agdev->uac2.c_prm.rbuf);
+ agdev->gadget = NULL;
return -EINVAL;
}
@@ -1129,7 +1080,7 @@ afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt)
struct audio_dev *agdev = func_to_agdev(fn);
struct snd_uac2_chip *uac2 = &agdev->uac2;
struct usb_gadget *gadget = cdev->gadget;
- struct device *dev = &uac2->pdev.dev;
+ struct device *dev = &gadget->dev;
struct usb_request *req;
struct usb_ep *ep;
struct uac2_rtd_params *prm;
@@ -1230,7 +1181,6 @@ static int
afunc_get_alt(struct usb_function *fn, unsigned intf)
{
struct audio_dev *agdev = func_to_agdev(fn);
- struct snd_uac2_chip *uac2 = &agdev->uac2;
if (intf == agdev->ac_intf)
return agdev->ac_alt;
@@ -1239,7 +1189,7 @@ afunc_get_alt(struct usb_function *fn, unsigned intf)
else if (intf == agdev->as_in_intf)
return agdev->as_in_alt;
else
- dev_err(&uac2->pdev.dev,
+ dev_err(&agdev->gadget->dev,
"%s:%d Invalid Interface %d!\n",
__func__, __LINE__, intf);
@@ -1264,7 +1214,6 @@ in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
{
struct usb_request *req = fn->config->cdev->req;
struct audio_dev *agdev = func_to_agdev(fn);
- struct snd_uac2_chip *uac2 = &agdev->uac2;
struct f_uac2_opts *opts;
u16 w_length = le16_to_cpu(cr->wLength);
u16 w_index = le16_to_cpu(cr->wIndex);
@@ -1293,7 +1242,7 @@ in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
*(u8 *)req->buf = 1;
value = min_t(unsigned, w_length, 1);
} else {
- dev_err(&uac2->pdev.dev,
+ dev_err(&agdev->gadget->dev,
"%s:%d control_selector=%d TODO!\n",
__func__, __LINE__, control_selector);
}
@@ -1306,7 +1255,6 @@ in_rq_range(struct usb_function *fn, const struct usb_ctrlrequest *cr)
{
struct usb_request *req = fn->config->cdev->req;
struct audio_dev *agdev = func_to_agdev(fn);
- struct snd_uac2_chip *uac2 = &agdev->uac2;
struct f_uac2_opts *opts;
u16 w_length = le16_to_cpu(cr->wLength);
u16 w_index = le16_to_cpu(cr->wIndex);
@@ -1336,7 +1284,7 @@ in_rq_range(struct usb_function *fn, const struct usb_ctrlrequest *cr)
value = min_t(unsigned, w_length, sizeof r);
memcpy(req->buf, &r, value);
} else {
- dev_err(&uac2->pdev.dev,
+ dev_err(&agdev->gadget->dev,
"%s:%d control_selector=%d TODO!\n",
__func__, __LINE__, control_selector);
}
@@ -1372,12 +1320,11 @@ static int
setup_rq_inf(struct usb_function *fn, const struct usb_ctrlrequest *cr)
{
struct audio_dev *agdev = func_to_agdev(fn);
- struct snd_uac2_chip *uac2 = &agdev->uac2;
u16 w_index = le16_to_cpu(cr->wIndex);
u8 intf = w_index & 0xff;
if (intf != agdev->ac_intf) {
- dev_err(&uac2->pdev.dev,
+ dev_err(&agdev->gadget->dev,
"%s:%d Error!\n", __func__, __LINE__);
return -EOPNOTSUPP;
}
@@ -1395,7 +1342,6 @@ afunc_setup(struct usb_function *fn, const struct usb_ctrlrequest *cr)
{
struct usb_composite_dev *cdev = fn->config->cdev;
struct audio_dev *agdev = func_to_agdev(fn);
- struct snd_uac2_chip *uac2 = &agdev->uac2;
struct usb_request *req = cdev->req;
u16 w_length = le16_to_cpu(cr->wLength);
int value = -EOPNOTSUPP;
@@ -1407,14 +1353,15 @@ afunc_setup(struct usb_function *fn, const struct usb_ctrlrequest *cr)
if ((cr->bRequestType & USB_RECIP_MASK) == USB_RECIP_INTERFACE)
value = setup_rq_inf(fn, cr);
else
- dev_err(&uac2->pdev.dev, "%s:%d Error!\n", __func__, __LINE__);
+ dev_err(&agdev->gadget->dev, "%s:%d Error!\n",
+ __func__, __LINE__);
if (value >= 0) {
req->length = value;
req->zero = value < w_length;
value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
if (value < 0) {
- dev_err(&uac2->pdev.dev,
+ dev_err(&agdev->gadget->dev,
"%s:%d Error!\n", __func__, __LINE__);
req->status = 0;
}
@@ -1553,7 +1500,7 @@ static void afunc_unbind(struct usb_configuration *c, struct usb_function *f)
struct audio_dev *agdev = func_to_agdev(f);
struct uac2_rtd_params *prm;
- alsa_uac2_exit(agdev);
+ snd_uac2_remove(agdev);
prm = &agdev->uac2.p_prm;
kfree(prm->rbuf);
@@ -1561,6 +1508,8 @@ static void afunc_unbind(struct usb_configuration *c, struct usb_function *f)
prm = &agdev->uac2.c_prm;
kfree(prm->rbuf);
usb_free_all_descriptors(f);
+
+ agdev->gadget = NULL;
}
static struct usb_function *afunc_alloc(struct usb_function_instance *fi)
--
1.9.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH v3 2/3] usb: gadget: f_uac2: split out audio core
2016-08-17 20:49 [PATCH v3 0/3] USB Audio Gadget refactoring Ruslan Bilovol
2016-08-17 20:49 ` [PATCH v3 1/3] usb: gadget: f_uac2: remove platform driver/device creation Ruslan Bilovol
@ 2016-08-17 20:49 ` Ruslan Bilovol
2016-08-17 20:49 ` [PATCH v3 3/3] usb: gadget: add f_uac1 variant based on new u_audio api Ruslan Bilovol
2016-08-29 8:05 ` [PATCH v3 0/3] USB Audio Gadget refactoring Felipe Balbi
3 siblings, 0 replies; 6+ messages in thread
From: Ruslan Bilovol @ 2016-08-17 20:49 UTC (permalink / raw)
To: Felipe Balbi
Cc: Daniel Mack, Jassi Brar, Clemens Ladisch, Jonathan Corbet,
Greg Kroah-Hartman, Peter Chen, linux-usb, linux-doc,
linux-kernel
Abstract the peripheral side ALSA sound card code from
the f_uac2 function into a component that can be called
by various functions, so the various flavors can be split
apart and selectively reused.
Visible changes:
- add uac_params structure to pass audio paramteres for
g_audio_setup
- make ALSA sound card's name configurable
- add [in/out]_ep_maxpsize
- allocate snd_uac_chip structure during g_audio_setup
- add u_audio_[start/stop]_[capture/playback] functions
Signed-off-by: Ruslan Bilovol <ruslan.bilovol@gmail.com>
---
drivers/usb/gadget/Kconfig | 4 +
drivers/usb/gadget/function/Makefile | 1 +
drivers/usb/gadget/function/f_uac2.c | 699 ++++------------------------------
drivers/usb/gadget/function/u_audio.c | 632 ++++++++++++++++++++++++++++++
drivers/usb/gadget/function/u_audio.h | 93 +++++
drivers/usb/gadget/legacy/Kconfig | 1 +
6 files changed, 813 insertions(+), 617 deletions(-)
create mode 100644 drivers/usb/gadget/function/u_audio.c
create mode 100644 drivers/usb/gadget/function/u_audio.h
diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 3c3f31c..a25afd8 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -158,6 +158,9 @@ config USB_U_SERIAL
config USB_U_ETHER
tristate
+config USB_U_AUDIO
+ tristate
+
config USB_F_SERIAL
tristate
@@ -400,6 +403,7 @@ config USB_CONFIGFS_F_UAC2
depends on SND
select USB_LIBCOMPOSITE
select SND_PCM
+ select USB_U_AUDIO
select USB_F_UAC2
help
This Audio function is compatible with USB Audio Class
diff --git a/drivers/usb/gadget/function/Makefile b/drivers/usb/gadget/function/Makefile
index cb8c225..b29f2ae 100644
--- a/drivers/usb/gadget/function/Makefile
+++ b/drivers/usb/gadget/function/Makefile
@@ -32,6 +32,7 @@ usb_f_mass_storage-y := f_mass_storage.o storage_common.o
obj-$(CONFIG_USB_F_MASS_STORAGE)+= usb_f_mass_storage.o
usb_f_fs-y := f_fs.o
obj-$(CONFIG_USB_F_FS) += usb_f_fs.o
+obj-$(CONFIG_USB_U_AUDIO) += u_audio.o
usb_f_uac1-y := f_uac1.o u_uac1.o
obj-$(CONFIG_USB_F_UAC1) += usb_f_uac1.o
usb_f_uac2-y := f_uac2.o
diff --git a/drivers/usb/gadget/function/f_uac2.c b/drivers/usb/gadget/function/f_uac2.c
index e14628c..ef8e976 100644
--- a/drivers/usb/gadget/function/f_uac2.c
+++ b/drivers/usb/gadget/function/f_uac2.c
@@ -15,15 +15,9 @@
#include <linux/usb/audio-v2.h>
#include <linux/module.h>
-#include <sound/core.h>
-#include <sound/pcm.h>
-#include <sound/pcm_params.h>
-
+#include "u_audio.h"
#include "u_uac2.h"
-/* Keep everyone on toes */
-#define USB_XFERS 2
-
/*
* The driver implements a simple UAC_2 topology.
* USB-OUT -> IT_1 -> OT_3 -> ALSA_Capture
@@ -53,453 +47,23 @@
#define UNFLW_CTRL 8
#define OVFLW_CTRL 10
-struct uac2_req {
- struct uac2_rtd_params *pp; /* parent param */
- struct usb_request *req;
-};
-
-struct uac2_rtd_params {
- struct snd_uac2_chip *uac2; /* parent chip */
- bool ep_enabled; /* if the ep is enabled */
- /* Size of the ring buffer */
- size_t dma_bytes;
- unsigned char *dma_area;
-
- struct snd_pcm_substream *ss;
-
- /* Ring buffer */
- ssize_t hw_ptr;
-
- void *rbuf;
-
- size_t period_size;
-
- unsigned max_psize;
- struct uac2_req ureq[USB_XFERS];
-
- spinlock_t lock;
-};
-
-struct snd_uac2_chip {
- struct uac2_rtd_params p_prm;
- struct uac2_rtd_params c_prm;
-
- struct snd_card *card;
- struct snd_pcm *pcm;
-
- /* timekeeping for the playback endpoint */
- unsigned int p_interval;
- unsigned int p_residue;
-
- /* pre-calculated values for playback iso completion */
- unsigned int p_pktsize;
- unsigned int p_pktsize_residue;
- unsigned int p_framesize;
-};
-
-#define BUFF_SIZE_MAX (PAGE_SIZE * 16)
-#define PRD_SIZE_MAX PAGE_SIZE
-#define MIN_PERIODS 4
-
-static struct snd_pcm_hardware uac2_pcm_hardware = {
- .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER
- | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID
- | SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME,
- .rates = SNDRV_PCM_RATE_CONTINUOUS,
- .periods_max = BUFF_SIZE_MAX / PRD_SIZE_MAX,
- .buffer_bytes_max = BUFF_SIZE_MAX,
- .period_bytes_max = PRD_SIZE_MAX,
- .periods_min = MIN_PERIODS,
-};
-
-struct audio_dev {
- u8 ac_intf, ac_alt;
- u8 as_out_intf, as_out_alt;
- u8 as_in_intf, as_in_alt;
-
- struct usb_ep *in_ep, *out_ep;
- struct usb_function func;
- struct usb_gadget *gadget;
-
- /* The ALSA Sound Card it represents on the USB-Client side */
- struct snd_uac2_chip uac2;
+struct f_uac2 {
+ struct g_audio g_audio;
+ u8 ac_intf, as_in_intf, as_out_intf;
+ u8 ac_alt, as_in_alt, as_out_alt; /* needed for get_alt() */
};
-static inline
-struct audio_dev *func_to_agdev(struct usb_function *f)
-{
- return container_of(f, struct audio_dev, func);
-}
-
-static inline
-struct audio_dev *uac2_to_agdev(struct snd_uac2_chip *u)
+static inline struct f_uac2 *func_to_uac2(struct usb_function *f)
{
- return container_of(u, struct audio_dev, uac2);
+ return container_of(f, struct f_uac2, g_audio.func);
}
static inline
-struct f_uac2_opts *agdev_to_uac2_opts(struct audio_dev *agdev)
+struct f_uac2_opts *g_audio_to_uac2_opts(struct g_audio *agdev)
{
return container_of(agdev->func.fi, struct f_uac2_opts, func_inst);
}
-static inline
-uint num_channels(uint chanmask)
-{
- uint num = 0;
-
- while (chanmask) {
- num += (chanmask & 1);
- chanmask >>= 1;
- }
-
- return num;
-}
-
-static void
-agdev_iso_complete(struct usb_ep *ep, struct usb_request *req)
-{
- unsigned pending;
- unsigned long flags;
- unsigned int hw_ptr;
- bool update_alsa = false;
- int status = req->status;
- struct uac2_req *ur = req->context;
- struct snd_pcm_substream *substream;
- struct uac2_rtd_params *prm = ur->pp;
- struct snd_uac2_chip *uac2 = prm->uac2;
-
- /* i/f shutting down */
- if (!prm->ep_enabled || req->status == -ESHUTDOWN)
- return;
-
- /*
- * We can't really do much about bad xfers.
- * Afterall, the ISOCH xfers could fail legitimately.
- */
- if (status)
- pr_debug("%s: iso_complete status(%d) %d/%d\n",
- __func__, status, req->actual, req->length);
-
- substream = prm->ss;
-
- /* Do nothing if ALSA isn't active */
- if (!substream)
- goto exit;
-
- spin_lock_irqsave(&prm->lock, flags);
-
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
- /*
- * For each IN packet, take the quotient of the current data
- * rate and the endpoint's interval as the base packet size.
- * If there is a residue from this division, add it to the
- * residue accumulator.
- */
- req->length = uac2->p_pktsize;
- uac2->p_residue += uac2->p_pktsize_residue;
-
- /*
- * Whenever there are more bytes in the accumulator than we
- * need to add one more sample frame, increase this packet's
- * size and decrease the accumulator.
- */
- if (uac2->p_residue / uac2->p_interval >= uac2->p_framesize) {
- req->length += uac2->p_framesize;
- uac2->p_residue -= uac2->p_framesize *
- uac2->p_interval;
- }
-
- req->actual = req->length;
- }
-
- pending = prm->hw_ptr % prm->period_size;
- pending += req->actual;
- if (pending >= prm->period_size)
- update_alsa = true;
-
- hw_ptr = prm->hw_ptr;
- prm->hw_ptr = (prm->hw_ptr + req->actual) % prm->dma_bytes;
-
- spin_unlock_irqrestore(&prm->lock, flags);
-
- /* Pack USB load in ALSA ring buffer */
- pending = prm->dma_bytes - hw_ptr;
-
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
- if (unlikely(pending < req->actual)) {
- memcpy(req->buf, prm->dma_area + hw_ptr, pending);
- memcpy(req->buf + pending, prm->dma_area,
- req->actual - pending);
- } else {
- memcpy(req->buf, prm->dma_area + hw_ptr, req->actual);
- }
- } else {
- if (unlikely(pending < req->actual)) {
- memcpy(prm->dma_area + hw_ptr, req->buf, pending);
- memcpy(prm->dma_area, req->buf + pending,
- req->actual - pending);
- } else {
- memcpy(prm->dma_area + hw_ptr, req->buf, req->actual);
- }
- }
-
-exit:
- if (usb_ep_queue(ep, req, GFP_ATOMIC))
- dev_err(uac2->card->dev, "%d Error!\n", __LINE__);
-
- if (update_alsa)
- snd_pcm_period_elapsed(substream);
-
- return;
-}
-
-static int
-uac2_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
-{
- struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
- struct uac2_rtd_params *prm;
- unsigned long flags;
- int err = 0;
-
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
- prm = &uac2->p_prm;
- else
- prm = &uac2->c_prm;
-
- spin_lock_irqsave(&prm->lock, flags);
-
- /* Reset */
- prm->hw_ptr = 0;
-
- switch (cmd) {
- case SNDRV_PCM_TRIGGER_START:
- case SNDRV_PCM_TRIGGER_RESUME:
- prm->ss = substream;
- break;
- case SNDRV_PCM_TRIGGER_STOP:
- case SNDRV_PCM_TRIGGER_SUSPEND:
- prm->ss = NULL;
- break;
- default:
- err = -EINVAL;
- }
-
- spin_unlock_irqrestore(&prm->lock, flags);
-
- /* Clear buffer after Play stops */
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && !prm->ss)
- memset(prm->rbuf, 0, prm->max_psize * USB_XFERS);
-
- return err;
-}
-
-static snd_pcm_uframes_t uac2_pcm_pointer(struct snd_pcm_substream *substream)
-{
- struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
- struct uac2_rtd_params *prm;
-
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
- prm = &uac2->p_prm;
- else
- prm = &uac2->c_prm;
-
- return bytes_to_frames(substream->runtime, prm->hw_ptr);
-}
-
-static int uac2_pcm_hw_params(struct snd_pcm_substream *substream,
- struct snd_pcm_hw_params *hw_params)
-{
- struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
- struct uac2_rtd_params *prm;
- int err;
-
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
- prm = &uac2->p_prm;
- else
- prm = &uac2->c_prm;
-
- err = snd_pcm_lib_malloc_pages(substream,
- params_buffer_bytes(hw_params));
- if (err >= 0) {
- prm->dma_bytes = substream->runtime->dma_bytes;
- prm->dma_area = substream->runtime->dma_area;
- prm->period_size = params_period_bytes(hw_params);
- }
-
- return err;
-}
-
-static int uac2_pcm_hw_free(struct snd_pcm_substream *substream)
-{
- struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
- struct uac2_rtd_params *prm;
-
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
- prm = &uac2->p_prm;
- else
- prm = &uac2->c_prm;
-
- prm->dma_area = NULL;
- prm->dma_bytes = 0;
- prm->period_size = 0;
-
- return snd_pcm_lib_free_pages(substream);
-}
-
-static int uac2_pcm_open(struct snd_pcm_substream *substream)
-{
- struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
- struct snd_pcm_runtime *runtime = substream->runtime;
- struct audio_dev *audio_dev;
- struct f_uac2_opts *opts;
- int p_ssize, c_ssize;
- int p_srate, c_srate;
- int p_chmask, c_chmask;
-
- audio_dev = uac2_to_agdev(uac2);
- opts = container_of(audio_dev->func.fi, struct f_uac2_opts, func_inst);
- p_ssize = opts->p_ssize;
- c_ssize = opts->c_ssize;
- p_srate = opts->p_srate;
- c_srate = opts->c_srate;
- p_chmask = opts->p_chmask;
- c_chmask = opts->c_chmask;
- uac2->p_residue = 0;
-
- runtime->hw = uac2_pcm_hardware;
-
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
- spin_lock_init(&uac2->p_prm.lock);
- runtime->hw.rate_min = p_srate;
- switch (p_ssize) {
- case 3:
- runtime->hw.formats = SNDRV_PCM_FMTBIT_S24_3LE;
- break;
- case 4:
- runtime->hw.formats = SNDRV_PCM_FMTBIT_S32_LE;
- break;
- default:
- runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE;
- break;
- }
- runtime->hw.channels_min = num_channels(p_chmask);
- runtime->hw.period_bytes_min = 2 * uac2->p_prm.max_psize
- / runtime->hw.periods_min;
- } else {
- spin_lock_init(&uac2->c_prm.lock);
- runtime->hw.rate_min = c_srate;
- switch (c_ssize) {
- case 3:
- runtime->hw.formats = SNDRV_PCM_FMTBIT_S24_3LE;
- break;
- case 4:
- runtime->hw.formats = SNDRV_PCM_FMTBIT_S32_LE;
- break;
- default:
- runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE;
- break;
- }
- runtime->hw.channels_min = num_channels(c_chmask);
- runtime->hw.period_bytes_min = 2 * uac2->c_prm.max_psize
- / runtime->hw.periods_min;
- }
-
- runtime->hw.rate_max = runtime->hw.rate_min;
- runtime->hw.channels_max = runtime->hw.channels_min;
-
- snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
-
- return 0;
-}
-
-/* ALSA cries without these function pointers */
-static int uac2_pcm_null(struct snd_pcm_substream *substream)
-{
- return 0;
-}
-
-static struct snd_pcm_ops uac2_pcm_ops = {
- .open = uac2_pcm_open,
- .close = uac2_pcm_null,
- .ioctl = snd_pcm_lib_ioctl,
- .hw_params = uac2_pcm_hw_params,
- .hw_free = uac2_pcm_hw_free,
- .trigger = uac2_pcm_trigger,
- .pointer = uac2_pcm_pointer,
- .prepare = uac2_pcm_null,
-};
-
-static int snd_uac2_probe(struct audio_dev *audio_dev)
-{
- struct snd_uac2_chip *uac2 = &audio_dev->uac2;
- struct snd_card *card;
- struct snd_pcm *pcm;
- struct f_uac2_opts *opts;
- int err;
- int p_chmask, c_chmask;
-
- opts = container_of(audio_dev->func.fi, struct f_uac2_opts, func_inst);
- p_chmask = opts->p_chmask;
- c_chmask = opts->c_chmask;
-
- /* Choose any slot, with no id */
- err = snd_card_new(&audio_dev->gadget->dev,
- -1, NULL, THIS_MODULE, 0, &card);
- if (err < 0)
- return err;
-
- uac2->card = card;
-
- /*
- * Create first PCM device
- * Create a substream only for non-zero channel streams
- */
- err = snd_pcm_new(uac2->card, "UAC2 PCM", 0,
- p_chmask ? 1 : 0, c_chmask ? 1 : 0, &pcm);
- if (err < 0)
- goto snd_fail;
-
- strcpy(pcm->name, "UAC2 PCM");
- pcm->private_data = uac2;
-
- uac2->pcm = pcm;
-
- snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &uac2_pcm_ops);
- snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &uac2_pcm_ops);
-
- strcpy(card->driver, "UAC2_Gadget");
- strcpy(card->shortname, "UAC2_Gadget");
- sprintf(card->longname, "UAC2_Gadget %i", card->dev->id);
-
- snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
- snd_dma_continuous_data(GFP_KERNEL), 0, BUFF_SIZE_MAX);
-
- err = snd_card_register(card);
-
- if (!err)
- return 0;
-
-snd_fail:
- snd_card_free(card);
-
- uac2->pcm = NULL;
- uac2->card = NULL;
-
- return err;
-}
-
-static int snd_uac2_remove(struct audio_dev *audio_dev)
-{
- struct snd_card *card = audio_dev->uac2.card;
-
- if (card)
- return snd_card_free(card);
-
- return 0;
-}
-
-
/* --------- USB Function Interface ------------- */
enum {
@@ -887,30 +451,6 @@ struct cntrl_range_lay3 {
__u32 dRES;
} __packed;
-static inline void
-free_ep(struct uac2_rtd_params *prm, struct usb_ep *ep)
-{
- struct snd_uac2_chip *uac2 = prm->uac2;
- int i;
-
- if (!prm->ep_enabled)
- return;
-
- prm->ep_enabled = false;
-
- for (i = 0; i < USB_XFERS; i++) {
- if (prm->ureq[i].req) {
- usb_ep_dequeue(ep, prm->ureq[i].req);
- usb_ep_free_request(ep, prm->ureq[i].req);
- prm->ureq[i].req = NULL;
- }
- }
-
- if (usb_ep_disable(ep))
- dev_err(uac2->card->dev,
- "%s:%d Error!\n", __func__, __LINE__);
-}
-
static void set_ep_max_packet_size(const struct f_uac2_opts *uac2_opts,
struct usb_endpoint_descriptor *ep_desc,
unsigned int factor, bool is_playback)
@@ -937,12 +477,11 @@ static void set_ep_max_packet_size(const struct f_uac2_opts *uac2_opts,
static int
afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
{
- struct audio_dev *agdev = func_to_agdev(fn);
- struct snd_uac2_chip *uac2 = &agdev->uac2;
+ struct f_uac2 *uac2 = func_to_uac2(fn);
+ struct g_audio *agdev = func_to_g_audio(fn);
struct usb_composite_dev *cdev = cfg->cdev;
struct usb_gadget *gadget = cdev->gadget;
struct device *dev = &gadget->dev;
- struct uac2_rtd_params *prm;
struct f_uac2_opts *uac2_opts;
struct usb_string *us;
int ret;
@@ -989,8 +528,8 @@ afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
return ret;
}
std_ac_if_desc.bInterfaceNumber = ret;
- agdev->ac_intf = ret;
- agdev->ac_alt = 0;
+ uac2->ac_intf = ret;
+ uac2->ac_alt = 0;
ret = usb_interface_id(cfg, fn);
if (ret < 0) {
@@ -999,8 +538,8 @@ afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
}
std_as_out_if0_desc.bInterfaceNumber = ret;
std_as_out_if1_desc.bInterfaceNumber = ret;
- agdev->as_out_intf = ret;
- agdev->as_out_alt = 0;
+ uac2->as_out_intf = ret;
+ uac2->as_out_alt = 0;
ret = usb_interface_id(cfg, fn);
if (ret < 0) {
@@ -1009,8 +548,8 @@ afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
}
std_as_in_if0_desc.bInterfaceNumber = ret;
std_as_in_if1_desc.bInterfaceNumber = ret;
- agdev->as_in_intf = ret;
- agdev->as_in_alt = 0;
+ uac2->as_in_intf = ret;
+ uac2->as_in_alt = 0;
agdev->gadget = gadget;
@@ -1026,15 +565,17 @@ afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
goto err;
}
- uac2->p_prm.uac2 = uac2;
- uac2->c_prm.uac2 = uac2;
-
/* Calculate wMaxPacketSize according to audio bandwidth */
set_ep_max_packet_size(uac2_opts, &fs_epin_desc, 1000, true);
set_ep_max_packet_size(uac2_opts, &fs_epout_desc, 1000, false);
set_ep_max_packet_size(uac2_opts, &hs_epin_desc, 8000, true);
set_ep_max_packet_size(uac2_opts, &hs_epout_desc, 8000, false);
+ agdev->in_ep_maxpsize = max(fs_epin_desc.wMaxPacketSize,
+ hs_epin_desc.wMaxPacketSize);
+ agdev->out_ep_maxpsize = max(fs_epout_desc.wMaxPacketSize,
+ hs_epout_desc.wMaxPacketSize);
+
hs_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
hs_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
@@ -1043,23 +584,13 @@ afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
if (ret)
goto err;
- prm = &agdev->uac2.c_prm;
- prm->max_psize = hs_epout_desc.wMaxPacketSize;
- prm->rbuf = kzalloc(prm->max_psize * USB_XFERS, GFP_KERNEL);
- if (!prm->rbuf) {
- prm->max_psize = 0;
- goto err_free_descs;
- }
-
- prm = &agdev->uac2.p_prm;
- prm->max_psize = hs_epin_desc.wMaxPacketSize;
- prm->rbuf = kzalloc(prm->max_psize * USB_XFERS, GFP_KERNEL);
- if (!prm->rbuf) {
- prm->max_psize = 0;
- goto err_free_descs;
- }
-
- ret = snd_uac2_probe(agdev);
+ agdev->params.p_chmask = uac2_opts->p_chmask;
+ agdev->params.p_srate = uac2_opts->p_srate;
+ agdev->params.p_ssize = uac2_opts->p_ssize;
+ agdev->params.c_chmask = uac2_opts->c_chmask;
+ agdev->params.c_srate = uac2_opts->c_srate;
+ agdev->params.c_ssize = uac2_opts->c_ssize;
+ ret = g_audio_setup(agdev, "UAC2 PCM", "UAC2_Gadget");
if (ret)
goto err_free_descs;
return 0;
@@ -1067,8 +598,6 @@ afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
err_free_descs:
usb_free_all_descriptors(fn);
err:
- kfree(agdev->uac2.p_prm.rbuf);
- kfree(agdev->uac2.c_prm.rbuf);
agdev->gadget = NULL;
return -EINVAL;
}
@@ -1077,14 +606,10 @@ static int
afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt)
{
struct usb_composite_dev *cdev = fn->config->cdev;
- struct audio_dev *agdev = func_to_agdev(fn);
- struct snd_uac2_chip *uac2 = &agdev->uac2;
+ struct f_uac2 *uac2 = func_to_uac2(fn);
struct usb_gadget *gadget = cdev->gadget;
struct device *dev = &gadget->dev;
- struct usb_request *req;
- struct usb_ep *ep;
- struct uac2_rtd_params *prm;
- int req_len, i;
+ int ret = 0;
/* No i/f has more than 2 alt settings */
if (alt > 1) {
@@ -1092,7 +617,7 @@ afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt)
return -EINVAL;
}
- if (intf == agdev->ac_intf) {
+ if (intf == uac2->ac_intf) {
/* Control I/f has only 1 AltSetting - 0 */
if (alt) {
dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
@@ -1101,93 +626,40 @@ afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt)
return 0;
}
- if (intf == agdev->as_out_intf) {
- ep = agdev->out_ep;
- prm = &uac2->c_prm;
- config_ep_by_speed(gadget, fn, ep);
- agdev->as_out_alt = alt;
- req_len = prm->max_psize;
- } else if (intf == agdev->as_in_intf) {
- struct f_uac2_opts *opts = agdev_to_uac2_opts(agdev);
- unsigned int factor, rate;
- struct usb_endpoint_descriptor *ep_desc;
-
- ep = agdev->in_ep;
- prm = &uac2->p_prm;
- config_ep_by_speed(gadget, fn, ep);
- agdev->as_in_alt = alt;
-
- /* pre-calculate the playback endpoint's interval */
- if (gadget->speed == USB_SPEED_FULL) {
- ep_desc = &fs_epin_desc;
- factor = 1000;
- } else {
- ep_desc = &hs_epin_desc;
- factor = 8000;
- }
-
- /* pre-compute some values for iso_complete() */
- uac2->p_framesize = opts->p_ssize *
- num_channels(opts->p_chmask);
- rate = opts->p_srate * uac2->p_framesize;
- uac2->p_interval = factor / (1 << (ep_desc->bInterval - 1));
- uac2->p_pktsize = min_t(unsigned int, rate / uac2->p_interval,
- prm->max_psize);
+ if (intf == uac2->as_out_intf) {
+ uac2->as_out_alt = alt;
- if (uac2->p_pktsize < prm->max_psize)
- uac2->p_pktsize_residue = rate % uac2->p_interval;
+ if (alt)
+ ret = u_audio_start_capture(&uac2->g_audio);
else
- uac2->p_pktsize_residue = 0;
+ u_audio_stop_capture(&uac2->g_audio);
+ } else if (intf == uac2->as_in_intf) {
+ uac2->as_in_alt = alt;
- req_len = uac2->p_pktsize;
- uac2->p_residue = 0;
+ if (alt)
+ ret = u_audio_start_playback(&uac2->g_audio);
+ else
+ u_audio_stop_playback(&uac2->g_audio);
} else {
dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
return -EINVAL;
}
- if (alt == 0) {
- free_ep(prm, ep);
- return 0;
- }
-
- prm->ep_enabled = true;
- usb_ep_enable(ep);
-
- for (i = 0; i < USB_XFERS; i++) {
- if (!prm->ureq[i].req) {
- req = usb_ep_alloc_request(ep, GFP_ATOMIC);
- if (req == NULL)
- return -ENOMEM;
-
- prm->ureq[i].req = req;
- prm->ureq[i].pp = prm;
-
- req->zero = 0;
- req->context = &prm->ureq[i];
- req->length = req_len;
- req->complete = agdev_iso_complete;
- req->buf = prm->rbuf + i * prm->max_psize;
- }
-
- if (usb_ep_queue(ep, prm->ureq[i].req, GFP_ATOMIC))
- dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
- }
-
- return 0;
+ return ret;
}
static int
afunc_get_alt(struct usb_function *fn, unsigned intf)
{
- struct audio_dev *agdev = func_to_agdev(fn);
-
- if (intf == agdev->ac_intf)
- return agdev->ac_alt;
- else if (intf == agdev->as_out_intf)
- return agdev->as_out_alt;
- else if (intf == agdev->as_in_intf)
- return agdev->as_in_alt;
+ struct f_uac2 *uac2 = func_to_uac2(fn);
+ struct g_audio *agdev = func_to_g_audio(fn);
+
+ if (intf == uac2->ac_intf)
+ return uac2->ac_alt;
+ else if (intf == uac2->as_out_intf)
+ return uac2->as_out_alt;
+ else if (intf == uac2->as_in_intf)
+ return uac2->as_in_alt;
else
dev_err(&agdev->gadget->dev,
"%s:%d Invalid Interface %d!\n",
@@ -1199,21 +671,19 @@ afunc_get_alt(struct usb_function *fn, unsigned intf)
static void
afunc_disable(struct usb_function *fn)
{
- struct audio_dev *agdev = func_to_agdev(fn);
- struct snd_uac2_chip *uac2 = &agdev->uac2;
-
- free_ep(&uac2->p_prm, agdev->in_ep);
- agdev->as_in_alt = 0;
+ struct f_uac2 *uac2 = func_to_uac2(fn);
- free_ep(&uac2->c_prm, agdev->out_ep);
- agdev->as_out_alt = 0;
+ uac2->as_in_alt = 0;
+ uac2->as_out_alt = 0;
+ u_audio_stop_capture(&uac2->g_audio);
+ u_audio_stop_playback(&uac2->g_audio);
}
static int
in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
{
struct usb_request *req = fn->config->cdev->req;
- struct audio_dev *agdev = func_to_agdev(fn);
+ struct g_audio *agdev = func_to_g_audio(fn);
struct f_uac2_opts *opts;
u16 w_length = le16_to_cpu(cr->wLength);
u16 w_index = le16_to_cpu(cr->wIndex);
@@ -1223,7 +693,7 @@ in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
int value = -EOPNOTSUPP;
int p_srate, c_srate;
- opts = agdev_to_uac2_opts(agdev);
+ opts = g_audio_to_uac2_opts(agdev);
p_srate = opts->p_srate;
c_srate = opts->c_srate;
@@ -1254,7 +724,7 @@ static int
in_rq_range(struct usb_function *fn, const struct usb_ctrlrequest *cr)
{
struct usb_request *req = fn->config->cdev->req;
- struct audio_dev *agdev = func_to_agdev(fn);
+ struct g_audio *agdev = func_to_g_audio(fn);
struct f_uac2_opts *opts;
u16 w_length = le16_to_cpu(cr->wLength);
u16 w_index = le16_to_cpu(cr->wIndex);
@@ -1265,7 +735,7 @@ in_rq_range(struct usb_function *fn, const struct usb_ctrlrequest *cr)
int value = -EOPNOTSUPP;
int p_srate, c_srate;
- opts = agdev_to_uac2_opts(agdev);
+ opts = g_audio_to_uac2_opts(agdev);
p_srate = opts->p_srate;
c_srate = opts->c_srate;
@@ -1319,11 +789,12 @@ out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
static int
setup_rq_inf(struct usb_function *fn, const struct usb_ctrlrequest *cr)
{
- struct audio_dev *agdev = func_to_agdev(fn);
+ struct f_uac2 *uac2 = func_to_uac2(fn);
+ struct g_audio *agdev = func_to_g_audio(fn);
u16 w_index = le16_to_cpu(cr->wIndex);
u8 intf = w_index & 0xff;
- if (intf != agdev->ac_intf) {
+ if (intf != uac2->ac_intf) {
dev_err(&agdev->gadget->dev,
"%s:%d Error!\n", __func__, __LINE__);
return -EOPNOTSUPP;
@@ -1341,7 +812,7 @@ static int
afunc_setup(struct usb_function *fn, const struct usb_ctrlrequest *cr)
{
struct usb_composite_dev *cdev = fn->config->cdev;
- struct audio_dev *agdev = func_to_agdev(fn);
+ struct g_audio *agdev = func_to_g_audio(fn);
struct usb_request *req = cdev->req;
u16 w_length = le16_to_cpu(cr->wLength);
int value = -EOPNOTSUPP;
@@ -1484,10 +955,10 @@ static struct usb_function_instance *afunc_alloc_inst(void)
static void afunc_free(struct usb_function *f)
{
- struct audio_dev *agdev;
+ struct g_audio *agdev;
struct f_uac2_opts *opts;
- agdev = func_to_agdev(f);
+ agdev = func_to_g_audio(f);
opts = container_of(f->fi, struct f_uac2_opts, func_inst);
kfree(agdev);
mutex_lock(&opts->lock);
@@ -1497,16 +968,9 @@ static void afunc_free(struct usb_function *f)
static void afunc_unbind(struct usb_configuration *c, struct usb_function *f)
{
- struct audio_dev *agdev = func_to_agdev(f);
- struct uac2_rtd_params *prm;
-
- snd_uac2_remove(agdev);
-
- prm = &agdev->uac2.p_prm;
- kfree(prm->rbuf);
+ struct g_audio *agdev = func_to_g_audio(f);
- prm = &agdev->uac2.c_prm;
- kfree(prm->rbuf);
+ g_audio_cleanup(agdev);
usb_free_all_descriptors(f);
agdev->gadget = NULL;
@@ -1514,11 +978,11 @@ static void afunc_unbind(struct usb_configuration *c, struct usb_function *f)
static struct usb_function *afunc_alloc(struct usb_function_instance *fi)
{
- struct audio_dev *agdev;
+ struct f_uac2 *uac2;
struct f_uac2_opts *opts;
- agdev = kzalloc(sizeof(*agdev), GFP_KERNEL);
- if (agdev == NULL)
+ uac2 = kzalloc(sizeof(*uac2), GFP_KERNEL);
+ if (uac2 == NULL)
return ERR_PTR(-ENOMEM);
opts = container_of(fi, struct f_uac2_opts, func_inst);
@@ -1526,19 +990,20 @@ static struct usb_function *afunc_alloc(struct usb_function_instance *fi)
++opts->refcnt;
mutex_unlock(&opts->lock);
- agdev->func.name = "uac2_func";
- agdev->func.bind = afunc_bind;
- agdev->func.unbind = afunc_unbind;
- agdev->func.set_alt = afunc_set_alt;
- agdev->func.get_alt = afunc_get_alt;
- agdev->func.disable = afunc_disable;
- agdev->func.setup = afunc_setup;
- agdev->func.free_func = afunc_free;
+ uac2->g_audio.func.name = "uac2_func";
+ uac2->g_audio.func.bind = afunc_bind;
+ uac2->g_audio.func.unbind = afunc_unbind;
+ uac2->g_audio.func.set_alt = afunc_set_alt;
+ uac2->g_audio.func.get_alt = afunc_get_alt;
+ uac2->g_audio.func.disable = afunc_disable;
+ uac2->g_audio.func.setup = afunc_setup;
+ uac2->g_audio.func.free_func = afunc_free;
- return &agdev->func;
+ return &uac2->g_audio.func;
}
DECLARE_USB_FUNCTION_INIT(uac2, afunc_alloc_inst, afunc_alloc);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Yadwinder Singh");
MODULE_AUTHOR("Jaswinder Singh");
+MODULE_AUTHOR("Ruslan Bilovol");
diff --git a/drivers/usb/gadget/function/u_audio.c b/drivers/usb/gadget/function/u_audio.c
new file mode 100644
index 0000000..4c15d85
--- /dev/null
+++ b/drivers/usb/gadget/function/u_audio.c
@@ -0,0 +1,632 @@
+/*
+ * u_audio.c -- interface to USB gadget "ALSA sound card" utilities
+ *
+ * Copyright (C) 2016
+ * Author: Ruslan Bilovol <ruslan.bilovol@gmail.com>
+ *
+ * Based on f_uac2.c which is:
+ * Copyright (C) 2011
+ * Yadwinder Singh (yadi.brar01@gmail.com)
+ * Jaswinder Singh (jaswinder.singh@linaro.org)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+
+#include "u_audio.h"
+
+#define BUFF_SIZE_MAX (PAGE_SIZE * 16)
+#define PRD_SIZE_MAX PAGE_SIZE
+#define MIN_PERIODS 4
+/* Keep everyone on toes */
+#define USB_XFERS 2
+
+struct uac_req {
+ struct uac_rtd_params *pp; /* parent param */
+ struct usb_request *req;
+};
+
+/* Runtime data params for one stream */
+struct uac_rtd_params {
+ struct snd_uac_chip *uac; /* parent chip */
+ bool ep_enabled; /* if the ep is enabled */
+ /* Size of the ring buffer */
+ size_t dma_bytes;
+ unsigned char *dma_area;
+
+ struct snd_pcm_substream *ss;
+
+ /* Ring buffer */
+ ssize_t hw_ptr;
+
+ void *rbuf;
+
+ size_t period_size;
+
+ unsigned max_psize; /* MaxPacketSize of endpoint */
+ struct uac_req ureq[USB_XFERS];
+
+ spinlock_t lock;
+};
+
+struct snd_uac_chip {
+ struct g_audio *audio_dev;
+
+ struct uac_rtd_params p_prm;
+ struct uac_rtd_params c_prm;
+
+ struct snd_card *card;
+ struct snd_pcm *pcm;
+
+ /* timekeeping for the playback endpoint */
+ unsigned int p_interval;
+ unsigned int p_residue;
+
+ /* pre-calculated values for playback iso completion */
+ unsigned int p_pktsize;
+ unsigned int p_pktsize_residue;
+ unsigned int p_framesize;
+};
+
+static struct snd_pcm_hardware uac_pcm_hardware = {
+ .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER
+ | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID
+ | SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME,
+ .rates = SNDRV_PCM_RATE_CONTINUOUS,
+ .periods_max = BUFF_SIZE_MAX / PRD_SIZE_MAX,
+ .buffer_bytes_max = BUFF_SIZE_MAX,
+ .period_bytes_max = PRD_SIZE_MAX,
+ .periods_min = MIN_PERIODS,
+};
+
+static void u_audio_iso_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ unsigned pending;
+ unsigned long flags;
+ unsigned int hw_ptr;
+ bool update_alsa = false;
+ int status = req->status;
+ struct uac_req *ur = req->context;
+ struct snd_pcm_substream *substream;
+ struct uac_rtd_params *prm = ur->pp;
+ struct snd_uac_chip *uac = prm->uac;
+
+ /* i/f shutting down */
+ if (!prm->ep_enabled || req->status == -ESHUTDOWN)
+ return;
+
+ /*
+ * We can't really do much about bad xfers.
+ * Afterall, the ISOCH xfers could fail legitimately.
+ */
+ if (status)
+ pr_debug("%s: iso_complete status(%d) %d/%d\n",
+ __func__, status, req->actual, req->length);
+
+ substream = prm->ss;
+
+ /* Do nothing if ALSA isn't active */
+ if (!substream)
+ goto exit;
+
+ spin_lock_irqsave(&prm->lock, flags);
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ /*
+ * For each IN packet, take the quotient of the current data
+ * rate and the endpoint's interval as the base packet size.
+ * If there is a residue from this division, add it to the
+ * residue accumulator.
+ */
+ req->length = uac->p_pktsize;
+ uac->p_residue += uac->p_pktsize_residue;
+
+ /*
+ * Whenever there are more bytes in the accumulator than we
+ * need to add one more sample frame, increase this packet's
+ * size and decrease the accumulator.
+ */
+ if (uac->p_residue / uac->p_interval >= uac->p_framesize) {
+ req->length += uac->p_framesize;
+ uac->p_residue -= uac->p_framesize *
+ uac->p_interval;
+ }
+
+ req->actual = req->length;
+ }
+
+ pending = prm->hw_ptr % prm->period_size;
+ pending += req->actual;
+ if (pending >= prm->period_size)
+ update_alsa = true;
+
+ hw_ptr = prm->hw_ptr;
+ prm->hw_ptr = (prm->hw_ptr + req->actual) % prm->dma_bytes;
+
+ spin_unlock_irqrestore(&prm->lock, flags);
+
+ /* Pack USB load in ALSA ring buffer */
+ pending = prm->dma_bytes - hw_ptr;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ if (unlikely(pending < req->actual)) {
+ memcpy(req->buf, prm->dma_area + hw_ptr, pending);
+ memcpy(req->buf + pending, prm->dma_area,
+ req->actual - pending);
+ } else {
+ memcpy(req->buf, prm->dma_area + hw_ptr, req->actual);
+ }
+ } else {
+ if (unlikely(pending < req->actual)) {
+ memcpy(prm->dma_area + hw_ptr, req->buf, pending);
+ memcpy(prm->dma_area, req->buf + pending,
+ req->actual - pending);
+ } else {
+ memcpy(prm->dma_area + hw_ptr, req->buf, req->actual);
+ }
+ }
+
+exit:
+ if (usb_ep_queue(ep, req, GFP_ATOMIC))
+ dev_err(uac->card->dev, "%d Error!\n", __LINE__);
+
+ if (update_alsa)
+ snd_pcm_period_elapsed(substream);
+}
+
+static int uac_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct snd_uac_chip *uac = snd_pcm_substream_chip(substream);
+ struct uac_rtd_params *prm;
+ unsigned long flags;
+ int err = 0;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ prm = &uac->p_prm;
+ else
+ prm = &uac->c_prm;
+
+ spin_lock_irqsave(&prm->lock, flags);
+
+ /* Reset */
+ prm->hw_ptr = 0;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ prm->ss = substream;
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ prm->ss = NULL;
+ break;
+ default:
+ err = -EINVAL;
+ }
+
+ spin_unlock_irqrestore(&prm->lock, flags);
+
+ /* Clear buffer after Play stops */
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && !prm->ss)
+ memset(prm->rbuf, 0, prm->max_psize * USB_XFERS);
+
+ return err;
+}
+
+static snd_pcm_uframes_t uac_pcm_pointer(struct snd_pcm_substream *substream)
+{
+ struct snd_uac_chip *uac = snd_pcm_substream_chip(substream);
+ struct uac_rtd_params *prm;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ prm = &uac->p_prm;
+ else
+ prm = &uac->c_prm;
+
+ return bytes_to_frames(substream->runtime, prm->hw_ptr);
+}
+
+static int uac_pcm_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *hw_params)
+{
+ struct snd_uac_chip *uac = snd_pcm_substream_chip(substream);
+ struct uac_rtd_params *prm;
+ int err;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ prm = &uac->p_prm;
+ else
+ prm = &uac->c_prm;
+
+ err = snd_pcm_lib_malloc_pages(substream,
+ params_buffer_bytes(hw_params));
+ if (err >= 0) {
+ prm->dma_bytes = substream->runtime->dma_bytes;
+ prm->dma_area = substream->runtime->dma_area;
+ prm->period_size = params_period_bytes(hw_params);
+ }
+
+ return err;
+}
+
+static int uac_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+ struct snd_uac_chip *uac = snd_pcm_substream_chip(substream);
+ struct uac_rtd_params *prm;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ prm = &uac->p_prm;
+ else
+ prm = &uac->c_prm;
+
+ prm->dma_area = NULL;
+ prm->dma_bytes = 0;
+ prm->period_size = 0;
+
+ return snd_pcm_lib_free_pages(substream);
+}
+
+static int uac_pcm_open(struct snd_pcm_substream *substream)
+{
+ struct snd_uac_chip *uac = snd_pcm_substream_chip(substream);
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct g_audio *audio_dev;
+ struct uac_params *params;
+ int p_ssize, c_ssize;
+ int p_srate, c_srate;
+ int p_chmask, c_chmask;
+
+ audio_dev = uac->audio_dev;
+ params = &audio_dev->params;
+ p_ssize = params->p_ssize;
+ c_ssize = params->c_ssize;
+ p_srate = params->p_srate;
+ c_srate = params->c_srate;
+ p_chmask = params->p_chmask;
+ c_chmask = params->c_chmask;
+ uac->p_residue = 0;
+
+ runtime->hw = uac_pcm_hardware;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ spin_lock_init(&uac->p_prm.lock);
+ runtime->hw.rate_min = p_srate;
+ switch (p_ssize) {
+ case 3:
+ runtime->hw.formats = SNDRV_PCM_FMTBIT_S24_3LE;
+ break;
+ case 4:
+ runtime->hw.formats = SNDRV_PCM_FMTBIT_S32_LE;
+ break;
+ default:
+ runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE;
+ break;
+ }
+ runtime->hw.channels_min = num_channels(p_chmask);
+ runtime->hw.period_bytes_min = 2 * uac->p_prm.max_psize
+ / runtime->hw.periods_min;
+ } else {
+ spin_lock_init(&uac->c_prm.lock);
+ runtime->hw.rate_min = c_srate;
+ switch (c_ssize) {
+ case 3:
+ runtime->hw.formats = SNDRV_PCM_FMTBIT_S24_3LE;
+ break;
+ case 4:
+ runtime->hw.formats = SNDRV_PCM_FMTBIT_S32_LE;
+ break;
+ default:
+ runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE;
+ break;
+ }
+ runtime->hw.channels_min = num_channels(c_chmask);
+ runtime->hw.period_bytes_min = 2 * uac->c_prm.max_psize
+ / runtime->hw.periods_min;
+ }
+
+ runtime->hw.rate_max = runtime->hw.rate_min;
+ runtime->hw.channels_max = runtime->hw.channels_min;
+
+ snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
+
+ return 0;
+}
+
+/* ALSA cries without these function pointers */
+static int uac_pcm_null(struct snd_pcm_substream *substream)
+{
+ return 0;
+}
+
+static struct snd_pcm_ops uac_pcm_ops = {
+ .open = uac_pcm_open,
+ .close = uac_pcm_null,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = uac_pcm_hw_params,
+ .hw_free = uac_pcm_hw_free,
+ .trigger = uac_pcm_trigger,
+ .pointer = uac_pcm_pointer,
+ .prepare = uac_pcm_null,
+};
+
+static inline void free_ep(struct uac_rtd_params *prm, struct usb_ep *ep)
+{
+ struct snd_uac_chip *uac = prm->uac;
+ int i;
+
+ if (!prm->ep_enabled)
+ return;
+
+ prm->ep_enabled = false;
+
+ for (i = 0; i < USB_XFERS; i++) {
+ if (prm->ureq[i].req) {
+ usb_ep_dequeue(ep, prm->ureq[i].req);
+ usb_ep_free_request(ep, prm->ureq[i].req);
+ prm->ureq[i].req = NULL;
+ }
+ }
+
+ if (usb_ep_disable(ep))
+ dev_err(uac->card->dev, "%s:%d Error!\n", __func__, __LINE__);
+}
+
+
+int u_audio_start_capture(struct g_audio *audio_dev)
+{
+ struct g_audio *agdev = audio_dev;
+ struct snd_uac_chip *uac = agdev->uac;
+ struct usb_gadget *gadget = agdev->gadget;
+ struct device *dev = &gadget->dev;
+ struct usb_request *req;
+ struct usb_ep *ep;
+ struct uac_rtd_params *prm;
+ int req_len, i;
+
+ ep = agdev->out_ep;
+ prm = &uac->c_prm;
+ config_ep_by_speed(gadget, &agdev->func, ep);
+ req_len = prm->max_psize;
+
+ prm->ep_enabled = true;
+ usb_ep_enable(ep);
+
+ for (i = 0; i < USB_XFERS; i++) {
+ if (!prm->ureq[i].req) {
+ req = usb_ep_alloc_request(ep, GFP_ATOMIC);
+ if (req == NULL)
+ return -ENOMEM;
+
+ prm->ureq[i].req = req;
+ prm->ureq[i].pp = prm;
+
+ req->zero = 0;
+ req->context = &prm->ureq[i];
+ req->length = req_len;
+ req->complete = u_audio_iso_complete;
+ req->buf = prm->rbuf + i * prm->max_psize;
+ }
+
+ if (usb_ep_queue(ep, prm->ureq[i].req, GFP_ATOMIC))
+ dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(u_audio_start_capture);
+
+void u_audio_stop_capture(struct g_audio *audio_dev)
+{
+ struct snd_uac_chip *uac = audio_dev->uac;
+
+ free_ep(&uac->c_prm, audio_dev->out_ep);
+}
+EXPORT_SYMBOL_GPL(u_audio_stop_capture);
+
+int u_audio_start_playback(struct g_audio *audio_dev)
+{
+ struct g_audio *agdev = audio_dev;
+ struct snd_uac_chip *uac = agdev->uac;
+ struct usb_gadget *gadget = agdev->gadget;
+ struct device *dev = &gadget->dev;
+ struct usb_request *req;
+ struct usb_ep *ep;
+ struct uac_rtd_params *prm;
+ struct uac_params *params = &agdev->params;
+ unsigned int factor, rate;
+ const struct usb_endpoint_descriptor *ep_desc;
+ int req_len, i;
+
+ ep = agdev->in_ep;
+ prm = &uac->p_prm;
+ config_ep_by_speed(gadget, &agdev->func, ep);
+
+ ep_desc = ep->desc;
+
+ /* pre-calculate the playback endpoint's interval */
+ if (gadget->speed == USB_SPEED_FULL)
+ factor = 1000;
+ else
+ factor = 8000;
+
+ /* pre-compute some values for iso_complete() */
+ uac->p_framesize = params->p_ssize *
+ num_channels(params->p_chmask);
+ rate = params->p_srate * uac->p_framesize;
+ uac->p_interval = factor / (1 << (ep_desc->bInterval - 1));
+ uac->p_pktsize = min_t(unsigned int, rate / uac->p_interval,
+ prm->max_psize);
+
+ if (uac->p_pktsize < prm->max_psize)
+ uac->p_pktsize_residue = rate % uac->p_interval;
+ else
+ uac->p_pktsize_residue = 0;
+
+ req_len = uac->p_pktsize;
+ uac->p_residue = 0;
+
+ prm->ep_enabled = true;
+ usb_ep_enable(ep);
+
+ for (i = 0; i < USB_XFERS; i++) {
+ if (!prm->ureq[i].req) {
+ req = usb_ep_alloc_request(ep, GFP_ATOMIC);
+ if (req == NULL)
+ return -ENOMEM;
+
+ prm->ureq[i].req = req;
+ prm->ureq[i].pp = prm;
+
+ req->zero = 0;
+ req->context = &prm->ureq[i];
+ req->length = req_len;
+ req->complete = u_audio_iso_complete;
+ req->buf = prm->rbuf + i * prm->max_psize;
+ }
+
+ if (usb_ep_queue(ep, prm->ureq[i].req, GFP_ATOMIC))
+ dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(u_audio_start_playback);
+
+void u_audio_stop_playback(struct g_audio *audio_dev)
+{
+ struct snd_uac_chip *uac = audio_dev->uac;
+
+ free_ep(&uac->p_prm, audio_dev->in_ep);
+}
+EXPORT_SYMBOL_GPL(u_audio_stop_playback);
+
+int g_audio_setup(struct g_audio *g_audio, const char *pcm_name,
+ const char *card_name)
+{
+ struct snd_uac_chip *uac;
+ struct snd_card *card;
+ struct snd_pcm *pcm;
+ struct uac_params *params;
+ int p_chmask, c_chmask;
+ int err;
+
+ if (!g_audio)
+ return -EINVAL;
+
+ uac = kzalloc(sizeof(*uac), GFP_KERNEL);
+ if (!uac)
+ return -ENOMEM;
+ g_audio->uac = uac;
+ uac->audio_dev = g_audio;
+
+ params = &g_audio->params;
+ p_chmask = params->p_chmask;
+ c_chmask = params->c_chmask;
+
+ if (c_chmask) {
+ struct uac_rtd_params *prm = &uac->c_prm;
+
+ uac->c_prm.uac = uac;
+ prm->max_psize = g_audio->out_ep_maxpsize;
+ prm->rbuf = kzalloc(prm->max_psize * USB_XFERS, GFP_KERNEL);
+ if (!prm->rbuf) {
+ prm->max_psize = 0;
+ err = -ENOMEM;
+ goto fail;
+ }
+ }
+
+ if (p_chmask) {
+ struct uac_rtd_params *prm = &uac->p_prm;
+
+ uac->p_prm.uac = uac;
+ prm->max_psize = g_audio->in_ep_maxpsize;
+ prm->rbuf = kzalloc(prm->max_psize * USB_XFERS, GFP_KERNEL);
+ if (!prm->rbuf) {
+ prm->max_psize = 0;
+ err = -ENOMEM;
+ goto fail;
+ }
+ }
+
+ /* Choose any slot, with no id */
+ err = snd_card_new(&g_audio->gadget->dev,
+ -1, NULL, THIS_MODULE, 0, &card);
+ if (err < 0)
+ goto fail;
+
+ uac->card = card;
+
+ /*
+ * Create first PCM device
+ * Create a substream only for non-zero channel streams
+ */
+ err = snd_pcm_new(uac->card, pcm_name, 0,
+ p_chmask ? 1 : 0, c_chmask ? 1 : 0, &pcm);
+ if (err < 0)
+ goto snd_fail;
+
+ strcpy(pcm->name, pcm_name);
+ pcm->private_data = uac;
+ uac->pcm = pcm;
+
+ snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &uac_pcm_ops);
+ snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &uac_pcm_ops);
+
+ strcpy(card->driver, card_name);
+ strcpy(card->shortname, card_name);
+ sprintf(card->longname, "%s %i", card_name, card->dev->id);
+
+ snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
+ snd_dma_continuous_data(GFP_KERNEL), 0, BUFF_SIZE_MAX);
+
+ err = snd_card_register(card);
+
+ if (!err)
+ return 0;
+
+snd_fail:
+ snd_card_free(card);
+fail:
+ kfree(uac->p_prm.rbuf);
+ kfree(uac->c_prm.rbuf);
+ kfree(uac);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(g_audio_setup);
+
+void g_audio_cleanup(struct g_audio *g_audio)
+{
+ struct snd_uac_chip *uac;
+ struct snd_card *card;
+
+ if (!g_audio || !g_audio->uac)
+ return;
+
+ uac = g_audio->uac;
+ card = uac->card;
+ if (card)
+ snd_card_free(card);
+
+ kfree(uac->p_prm.rbuf);
+ kfree(uac->c_prm.rbuf);
+ kfree(uac);
+}
+EXPORT_SYMBOL_GPL(g_audio_cleanup);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("USB gadget \"ALSA sound card\" utilities");
+MODULE_AUTHOR("Ruslan Bilovol");
diff --git a/drivers/usb/gadget/function/u_audio.h b/drivers/usb/gadget/function/u_audio.h
new file mode 100644
index 0000000..bfa42655
--- /dev/null
+++ b/drivers/usb/gadget/function/u_audio.h
@@ -0,0 +1,93 @@
+/*
+ * u_audio.h -- interface to USB gadget "ALSA sound card" utilities
+ *
+ * Copyright (C) 2016
+ * Author: Ruslan Bilovol <ruslan.bilovol@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __U_AUDIO_H
+#define __U_AUDIO_H
+
+#include <linux/usb/composite.h>
+
+struct uac_params {
+ /* playback */
+ int p_chmask; /* channel mask */
+ int p_srate; /* rate in Hz */
+ int p_ssize; /* sample size */
+
+ /* capture */
+ int c_chmask; /* channel mask */
+ int c_srate; /* rate in Hz */
+ int c_ssize; /* sample size */
+};
+
+struct g_audio {
+ struct usb_function func;
+ struct usb_gadget *gadget;
+
+ struct usb_ep *in_ep;
+ struct usb_ep *out_ep;
+
+ /* Max packet size for all in_ep possible speeds */
+ unsigned int in_ep_maxpsize;
+ /* Max packet size for all out_ep possible speeds */
+ unsigned int out_ep_maxpsize;
+
+ /* The ALSA Sound Card it represents on the USB-Client side */
+ struct snd_uac_chip *uac;
+
+ struct uac_params params;
+};
+
+static inline struct g_audio *func_to_g_audio(struct usb_function *f)
+{
+ return container_of(f, struct g_audio, func);
+}
+
+static inline uint num_channels(uint chanmask)
+{
+ uint num = 0;
+
+ while (chanmask) {
+ num += (chanmask & 1);
+ chanmask >>= 1;
+ }
+
+ return num;
+}
+
+/*
+ * g_audio_setup - initialize one virtual ALSA sound card
+ * @g_audio: struct with filled params, in_ep_maxpsize, out_ep_maxpsize
+ * @pcm_name: the id string for a PCM instance of this sound card
+ * @card_name: name of this soundcard
+ *
+ * This sets up the single virtual ALSA sound card that may be exported by a
+ * gadget driver using this framework.
+ *
+ * Context: may sleep
+ *
+ * Returns zero on success, or a negative error on failure.
+ */
+int g_audio_setup(struct g_audio *g_audio, const char *pcm_name,
+ const char *card_name);
+void g_audio_cleanup(struct g_audio *g_audio);
+
+int u_audio_start_capture(struct g_audio *g_audio);
+void u_audio_stop_capture(struct g_audio *g_audio);
+int u_audio_start_playback(struct g_audio *g_audio);
+void u_audio_stop_playback(struct g_audio *g_audio);
+
+#endif /* __U_AUDIO_H */
diff --git a/drivers/usb/gadget/legacy/Kconfig b/drivers/usb/gadget/legacy/Kconfig
index 0b36878..5344064 100644
--- a/drivers/usb/gadget/legacy/Kconfig
+++ b/drivers/usb/gadget/legacy/Kconfig
@@ -56,6 +56,7 @@ config USB_AUDIO
select SND_PCM
select USB_F_UAC1 if GADGET_UAC1
select USB_F_UAC2 if !GADGET_UAC1
+ select USB_U_AUDIO if USB_F_UAC2
help
This Gadget Audio driver is compatible with USB Audio Class
specification 2.0. It implements 1 AudioControl interface,
--
1.9.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH v3 3/3] usb: gadget: add f_uac1 variant based on new u_audio api
2016-08-17 20:49 [PATCH v3 0/3] USB Audio Gadget refactoring Ruslan Bilovol
2016-08-17 20:49 ` [PATCH v3 1/3] usb: gadget: f_uac2: remove platform driver/device creation Ruslan Bilovol
2016-08-17 20:49 ` [PATCH v3 2/3] usb: gadget: f_uac2: split out audio core Ruslan Bilovol
@ 2016-08-17 20:49 ` Ruslan Bilovol
2016-08-29 8:05 ` [PATCH v3 0/3] USB Audio Gadget refactoring Felipe Balbi
3 siblings, 0 replies; 6+ messages in thread
From: Ruslan Bilovol @ 2016-08-17 20:49 UTC (permalink / raw)
To: Felipe Balbi
Cc: Daniel Mack, Jassi Brar, Clemens Ladisch, Jonathan Corbet,
Greg Kroah-Hartman, Peter Chen, linux-usb, linux-doc,
linux-kernel
This patch adds new function f_uac1_newapi that
uses recently created u_audio api. This makes
f_uac1_newapi implementation much simpler by
reusing existing u_audio core utilities.
This also drops previous f_uac1 approach (write
audio samples directly to existing ALSA sound
card) and moves to more generic/flexible
one - create an f_uac1 ALSA sound card that
represents USB Audio function and allows to
be used by userspace tools.
f_uac1_newapi also has capture support (gadget->host).
By default, capture interface has 48000kHz/2ch
configuration, same as playback channel has.
f_uac1_newapi descriptors naming conventios
uses f_uac2 driver naming convention that
makes it more common and meaningful.
Comparing to f_uac1, the f_uac1_newapi doesn't
have volume/mute functionality. This is because
the volume/mute feature unit was dummy
implementation since that driver creation (2009)
and never had real volume control or mute
functionality.
g_audio can be built using one of existing
uac functions (f_uac1, f_uac1_newapi or f_uac2)
Signed-off-by: Ruslan Bilovol <ruslan.bilovol@gmail.com>
---
.../ABI/testing/configfs-usb-gadget-uac1_newapi | 12 +
Documentation/usb/gadget-testing.txt | 41 ++
drivers/usb/gadget/Kconfig | 21 +
drivers/usb/gadget/function/Makefile | 2 +
drivers/usb/gadget/function/f_uac1_newapi.c | 795 +++++++++++++++++++++
drivers/usb/gadget/function/u_uac1_newapi.h | 39 +
drivers/usb/gadget/legacy/Kconfig | 15 +-
drivers/usb/gadget/legacy/audio.c | 52 ++
8 files changed, 975 insertions(+), 2 deletions(-)
create mode 100644 Documentation/ABI/testing/configfs-usb-gadget-uac1_newapi
create mode 100644 drivers/usb/gadget/function/f_uac1_newapi.c
create mode 100644 drivers/usb/gadget/function/u_uac1_newapi.h
diff --git a/Documentation/ABI/testing/configfs-usb-gadget-uac1_newapi b/Documentation/ABI/testing/configfs-usb-gadget-uac1_newapi
new file mode 100644
index 0000000..d355275
--- /dev/null
+++ b/Documentation/ABI/testing/configfs-usb-gadget-uac1_newapi
@@ -0,0 +1,12 @@
+What: /config/usb-gadget/gadget/functions/uac1_newapi.name
+Date: Aug 2016
+KernelVersion: 4.9
+Description:
+ The attributes:
+
+ c_chmask - capture channel mask
+ c_srate - capture sampling rate
+ c_ssize - capture sample size (bytes)
+ p_chmask - playback channel mask
+ p_srate - playback sampling rate
+ p_ssize - playback sample size (bytes)
diff --git a/Documentation/usb/gadget-testing.txt b/Documentation/usb/gadget-testing.txt
index 5819605..4598d7f 100644
--- a/Documentation/usb/gadget-testing.txt
+++ b/Documentation/usb/gadget-testing.txt
@@ -20,6 +20,7 @@ provided by gadgets.
17. UAC2 function
18. UVC function
19. PRINTER function
+20. UAC1 function (new API)
1. ACM function
@@ -770,3 +771,43 @@ host:
More advanced testing can be done with the prn_example
described in Documentation/usb/gadget-printer.txt.
+
+
+20. UAC1 function (new API, using u_audio)
+=================
+
+The function is provided by usb_f_uac1_newapi.ko module.
+
+Function-specific configfs interface
+------------------------------------
+
+The function name to use when creating the function directory
+is "uac1_newapi". The uac1_newapi function provides these attributes
+in its function directory:
+
+ c_chmask - capture channel mask
+ c_srate - capture sampling rate
+ c_ssize - capture sample size (bytes)
+ p_chmask - playback channel mask
+ p_srate - playback sampling rate
+ p_ssize - playback sample size (bytes)
+
+The attributes have sane default values.
+
+Testing the UAC1 function
+-------------------------
+
+device: run the gadget
+host: aplay -l # should list our USB Audio Gadget
+
+This function does not require real hardware support, it just
+sends a stream of audio data to/from the host. In order to
+actually hear something at the device side, a command similar
+to this must be used at the device side:
+
+$ arecord -f dat -t wav -D hw:2,0 | aplay -D hw:0,0 &
+
+e.g.:
+
+$ arecord -f dat -t wav -D hw:CARD=UAC1Gadget,DEV=0 | \
+aplay -D default:CARD=OdroidU3
diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index a25afd8..abcb539 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -194,6 +194,9 @@ config USB_F_FS
config USB_F_UAC1
tristate
+config USB_F_UAC1_NEWAPI
+ tristate
+
config USB_F_UAC2
tristate
@@ -397,6 +400,24 @@ config USB_CONFIGFS_F_UAC1
This driver requires a real Audio codec to be present
on the device.
+config USB_CONFIGFS_F_UAC1_NEWAPI
+ bool "Audio Class 1.0 (new API)"
+ depends on USB_CONFIGFS
+ depends on SND
+ select USB_LIBCOMPOSITE
+ select SND_PCM
+ select USB_U_AUDIO
+ select USB_F_UAC1_NEWAPI
+ help
+ This Audio function implements 1 AudioControl interface,
+ 1 AudioStreaming Interface each for USB-OUT and USB-IN.
+ This driver doesn't expect any real Audio codec to be present
+ on the device - the audio streams are simply sinked to and
+ sourced from a virtual ALSA sound card created. The user-space
+ application may choose to do whatever it wants with the data
+ received from the USB Host and choose to provide whatever it
+ wants as audio data to the USB Host.
+
config USB_CONFIGFS_F_UAC2
bool "Audio Class 2.0"
depends on USB_CONFIGFS
diff --git a/drivers/usb/gadget/function/Makefile b/drivers/usb/gadget/function/Makefile
index b29f2ae..eeef5f8 100644
--- a/drivers/usb/gadget/function/Makefile
+++ b/drivers/usb/gadget/function/Makefile
@@ -35,6 +35,8 @@ obj-$(CONFIG_USB_F_FS) += usb_f_fs.o
obj-$(CONFIG_USB_U_AUDIO) += u_audio.o
usb_f_uac1-y := f_uac1.o u_uac1.o
obj-$(CONFIG_USB_F_UAC1) += usb_f_uac1.o
+usb_f_uac1_newapi-y := f_uac1_newapi.o
+obj-$(CONFIG_USB_F_UAC1_NEWAPI) += usb_f_uac1_newapi.o
usb_f_uac2-y := f_uac2.o
obj-$(CONFIG_USB_F_UAC2) += usb_f_uac2.o
usb_f_uvc-y := f_uvc.o uvc_queue.o uvc_v4l2.o uvc_video.o uvc_configfs.o
diff --git a/drivers/usb/gadget/function/f_uac1_newapi.c b/drivers/usb/gadget/function/f_uac1_newapi.c
new file mode 100644
index 0000000..d4bb075
--- /dev/null
+++ b/drivers/usb/gadget/function/f_uac1_newapi.c
@@ -0,0 +1,795 @@
+/*
+ * f_uac1_newapi.c -- USB Audio Class 1.0 Function (using new u_audio API)
+ *
+ * Copyright (C) 2016 Ruslan Bilovol <ruslan.bilovol@gmail.com>
+ *
+ * This file is based on f_uac1.c which is
+ * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
+ * Copyright (C) 2008 Analog Devices, Inc
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/usb/audio.h>
+#include <linux/module.h>
+
+#include "u_audio.h"
+#include "u_uac1_newapi.h"
+
+struct f_uac1 {
+ struct g_audio g_audio;
+ u8 ac_intf, as_in_intf, as_out_intf;
+ u8 ac_alt, as_in_alt, as_out_alt; /* needed for get_alt() */
+};
+
+static inline struct f_uac1 *func_to_uac1(struct usb_function *f)
+{
+ return container_of(f, struct f_uac1, g_audio.func);
+}
+
+/*
+ * DESCRIPTORS ... most are static, but strings and full
+ * configuration descriptors are built on demand.
+ */
+
+/*
+ * We have three interfaces - one AudioControl and two AudioStreaming
+ *
+ * The driver implements a simple UAC_1 topology.
+ * USB-OUT -> IT_1 -> OT_2 -> ALSA_Capture
+ * ALSA_Playback -> IT_3 -> OT_4 -> USB-IN
+ */
+#define F_AUDIO_AC_INTERFACE 0
+#define F_AUDIO_AS_OUT_INTERFACE 1
+#define F_AUDIO_AS_IN_INTERFACE 2
+/* Number of streaming interfaces */
+#define F_AUDIO_NUM_INTERFACES 2
+
+/* B.3.1 Standard AC Interface Descriptor */
+static struct usb_interface_descriptor ac_interface_desc = {
+ .bLength = USB_DT_INTERFACE_SIZE,
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bNumEndpoints = 0,
+ .bInterfaceClass = USB_CLASS_AUDIO,
+ .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
+};
+
+/*
+ * The number of AudioStreaming and MIDIStreaming interfaces
+ * in the Audio Interface Collection
+ */
+DECLARE_UAC_AC_HEADER_DESCRIPTOR(2);
+
+#define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES)
+/* 2 input terminals and 2 output terminals */
+#define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH \
+ + 2*UAC_DT_INPUT_TERMINAL_SIZE + 2*UAC_DT_OUTPUT_TERMINAL_SIZE)
+/* B.3.2 Class-Specific AC Interface Descriptor */
+static struct uac1_ac_header_descriptor_2 ac_header_desc = {
+ .bLength = UAC_DT_AC_HEADER_LENGTH,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubtype = UAC_HEADER,
+ .bcdADC = cpu_to_le16(0x0100),
+ .wTotalLength = cpu_to_le16(UAC_DT_TOTAL_LENGTH),
+ .bInCollection = F_AUDIO_NUM_INTERFACES,
+ .baInterfaceNr = {
+ /* Interface number of the AudioStream interfaces */
+ [0] = 1,
+ [1] = 2,
+ }
+};
+
+#define USB_OUT_IT_ID 1
+static struct uac_input_terminal_descriptor usb_out_it_desc = {
+ .bLength = UAC_DT_INPUT_TERMINAL_SIZE,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubtype = UAC_INPUT_TERMINAL,
+ .bTerminalID = USB_OUT_IT_ID,
+ .wTerminalType = UAC_TERMINAL_STREAMING,
+ .bAssocTerminal = 0,
+ .wChannelConfig = 0x3,
+};
+
+#define IO_OUT_OT_ID 2
+static struct uac1_output_terminal_descriptor io_out_ot_desc = {
+ .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
+ .bTerminalID = IO_OUT_OT_ID,
+ .wTerminalType = UAC_OUTPUT_TERMINAL_SPEAKER,
+ .bAssocTerminal = 0,
+ .bSourceID = USB_OUT_IT_ID,
+};
+
+#define IO_IN_IT_ID 3
+static struct uac_input_terminal_descriptor io_in_it_desc = {
+ .bLength = UAC_DT_INPUT_TERMINAL_SIZE,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubtype = UAC_INPUT_TERMINAL,
+ .bTerminalID = IO_IN_IT_ID,
+ .wTerminalType = UAC_INPUT_TERMINAL_MICROPHONE,
+ .bAssocTerminal = 0,
+ .wChannelConfig = 0x3,
+};
+
+#define USB_IN_OT_ID 4
+static struct uac1_output_terminal_descriptor usb_in_ot_desc = {
+ .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
+ .bTerminalID = USB_IN_OT_ID,
+ .wTerminalType = UAC_TERMINAL_STREAMING,
+ .bAssocTerminal = 0,
+ .bSourceID = IO_IN_IT_ID,
+};
+
+/* B.4.1 Standard AS Interface Descriptor */
+static struct usb_interface_descriptor as_out_interface_alt_0_desc = {
+ .bLength = USB_DT_INTERFACE_SIZE,
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bAlternateSetting = 0,
+ .bNumEndpoints = 0,
+ .bInterfaceClass = USB_CLASS_AUDIO,
+ .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
+};
+
+static struct usb_interface_descriptor as_out_interface_alt_1_desc = {
+ .bLength = USB_DT_INTERFACE_SIZE,
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bAlternateSetting = 1,
+ .bNumEndpoints = 1,
+ .bInterfaceClass = USB_CLASS_AUDIO,
+ .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
+};
+
+static struct usb_interface_descriptor as_in_interface_alt_0_desc = {
+ .bLength = USB_DT_INTERFACE_SIZE,
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bAlternateSetting = 0,
+ .bNumEndpoints = 0,
+ .bInterfaceClass = USB_CLASS_AUDIO,
+ .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
+};
+
+static struct usb_interface_descriptor as_in_interface_alt_1_desc = {
+ .bLength = USB_DT_INTERFACE_SIZE,
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bAlternateSetting = 1,
+ .bNumEndpoints = 1,
+ .bInterfaceClass = USB_CLASS_AUDIO,
+ .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
+};
+
+/* B.4.2 Class-Specific AS Interface Descriptor */
+static struct uac1_as_header_descriptor as_out_header_desc = {
+ .bLength = UAC_DT_AS_HEADER_SIZE,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubtype = UAC_AS_GENERAL,
+ .bTerminalLink = USB_OUT_IT_ID,
+ .bDelay = 1,
+ .wFormatTag = UAC_FORMAT_TYPE_I_PCM,
+};
+
+static struct uac1_as_header_descriptor as_in_header_desc = {
+ .bLength = UAC_DT_AS_HEADER_SIZE,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubtype = UAC_AS_GENERAL,
+ .bTerminalLink = USB_IN_OT_ID,
+ .bDelay = 1,
+ .wFormatTag = UAC_FORMAT_TYPE_I_PCM,
+};
+
+DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1);
+
+static struct uac_format_type_i_discrete_descriptor_1 as_out_type_i_desc = {
+ .bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubtype = UAC_FORMAT_TYPE,
+ .bFormatType = UAC_FORMAT_TYPE_I,
+ .bSubframeSize = 2,
+ .bBitResolution = 16,
+ .bSamFreqType = 1,
+};
+
+/* Standard ISO OUT Endpoint Descriptor */
+static struct usb_endpoint_descriptor as_out_ep_desc = {
+ .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_OUT,
+ .bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE
+ | USB_ENDPOINT_XFER_ISOC,
+ .wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
+ .bInterval = 4,
+};
+
+/* Class-specific AS ISO OUT Endpoint Descriptor */
+static struct uac_iso_endpoint_descriptor as_iso_out_desc = {
+ .bLength = UAC_ISO_ENDPOINT_DESC_SIZE,
+ .bDescriptorType = USB_DT_CS_ENDPOINT,
+ .bDescriptorSubtype = UAC_EP_GENERAL,
+ .bmAttributes = 1,
+ .bLockDelayUnits = 1,
+ .wLockDelay = cpu_to_le16(1),
+};
+
+static struct uac_format_type_i_discrete_descriptor_1 as_in_type_i_desc = {
+ .bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubtype = UAC_FORMAT_TYPE,
+ .bFormatType = UAC_FORMAT_TYPE_I,
+ .bSubframeSize = 2,
+ .bBitResolution = 16,
+ .bSamFreqType = 1,
+};
+
+/* Standard ISO OUT Endpoint Descriptor */
+static struct usb_endpoint_descriptor as_in_ep_desc = {
+ .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_SYNC_ASYNC
+ | USB_ENDPOINT_XFER_ISOC,
+ .wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
+ .bInterval = 4,
+};
+
+/* Class-specific AS ISO OUT Endpoint Descriptor */
+static struct uac_iso_endpoint_descriptor as_iso_in_desc = {
+ .bLength = UAC_ISO_ENDPOINT_DESC_SIZE,
+ .bDescriptorType = USB_DT_CS_ENDPOINT,
+ .bDescriptorSubtype = UAC_EP_GENERAL,
+ .bmAttributes = 1,
+ .bLockDelayUnits = 0,
+ .wLockDelay = 0,
+};
+
+static struct usb_descriptor_header *f_audio_desc[] = {
+ (struct usb_descriptor_header *)&ac_interface_desc,
+ (struct usb_descriptor_header *)&ac_header_desc,
+
+ (struct usb_descriptor_header *)&usb_out_it_desc,
+ (struct usb_descriptor_header *)&io_out_ot_desc,
+ (struct usb_descriptor_header *)&io_in_it_desc,
+ (struct usb_descriptor_header *)&usb_in_ot_desc,
+
+ (struct usb_descriptor_header *)&as_out_interface_alt_0_desc,
+ (struct usb_descriptor_header *)&as_out_interface_alt_1_desc,
+ (struct usb_descriptor_header *)&as_out_header_desc,
+
+ (struct usb_descriptor_header *)&as_out_type_i_desc,
+
+ (struct usb_descriptor_header *)&as_out_ep_desc,
+ (struct usb_descriptor_header *)&as_iso_out_desc,
+
+ (struct usb_descriptor_header *)&as_in_interface_alt_0_desc,
+ (struct usb_descriptor_header *)&as_in_interface_alt_1_desc,
+ (struct usb_descriptor_header *)&as_in_header_desc,
+
+ (struct usb_descriptor_header *)&as_in_type_i_desc,
+
+ (struct usb_descriptor_header *)&as_in_ep_desc,
+ (struct usb_descriptor_header *)&as_iso_in_desc,
+ NULL,
+};
+
+enum {
+ STR_AC_IF,
+ STR_USB_OUT_IT,
+ STR_USB_OUT_IT_CH_NAMES,
+ STR_IO_OUT_OT,
+ STR_IO_IN_IT,
+ STR_IO_IN_IT_CH_NAMES,
+ STR_USB_IN_OT,
+ STR_AS_OUT_IF_ALT0,
+ STR_AS_OUT_IF_ALT1,
+ STR_AS_IN_IF_ALT0,
+ STR_AS_IN_IF_ALT1,
+};
+
+static struct usb_string strings_uac1[] = {
+ [STR_AC_IF].s = "AC Interface",
+ [STR_USB_OUT_IT].s = "Playback Input terminal",
+ [STR_USB_OUT_IT_CH_NAMES].s = "Playback Channels",
+ [STR_IO_OUT_OT].s = "Playback Output terminal",
+ [STR_IO_IN_IT].s = "Capture Input terminal",
+ [STR_IO_IN_IT_CH_NAMES].s = "Capture Channels",
+ [STR_USB_IN_OT].s = "Capture Output terminal",
+ [STR_AS_OUT_IF_ALT0].s = "Playback Inactive",
+ [STR_AS_OUT_IF_ALT1].s = "Playback Active",
+ [STR_AS_IN_IF_ALT0].s = "Capture Inactive",
+ [STR_AS_IN_IF_ALT1].s = "Capture Active",
+ { },
+};
+
+static struct usb_gadget_strings str_uac1 = {
+ .language = 0x0409, /* en-us */
+ .strings = strings_uac1,
+};
+
+static struct usb_gadget_strings *uac1_strings[] = {
+ &str_uac1,
+ NULL,
+};
+
+/*
+ * This function is an ALSA sound card following USB Audio Class Spec 1.0.
+ */
+
+static int audio_set_endpoint_req(struct usb_function *f,
+ const struct usb_ctrlrequest *ctrl)
+{
+ struct usb_composite_dev *cdev = f->config->cdev;
+ int value = -EOPNOTSUPP;
+ u16 ep = le16_to_cpu(ctrl->wIndex);
+ u16 len = le16_to_cpu(ctrl->wLength);
+ u16 w_value = le16_to_cpu(ctrl->wValue);
+
+ DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
+ ctrl->bRequest, w_value, len, ep);
+
+ switch (ctrl->bRequest) {
+ case UAC_SET_CUR:
+ value = len;
+ break;
+
+ case UAC_SET_MIN:
+ break;
+
+ case UAC_SET_MAX:
+ break;
+
+ case UAC_SET_RES:
+ break;
+
+ case UAC_SET_MEM:
+ break;
+
+ default:
+ break;
+ }
+
+ return value;
+}
+
+static int audio_get_endpoint_req(struct usb_function *f,
+ const struct usb_ctrlrequest *ctrl)
+{
+ struct usb_composite_dev *cdev = f->config->cdev;
+ int value = -EOPNOTSUPP;
+ u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
+ u16 len = le16_to_cpu(ctrl->wLength);
+ u16 w_value = le16_to_cpu(ctrl->wValue);
+
+ DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
+ ctrl->bRequest, w_value, len, ep);
+
+ switch (ctrl->bRequest) {
+ case UAC_GET_CUR:
+ case UAC_GET_MIN:
+ case UAC_GET_MAX:
+ case UAC_GET_RES:
+ value = len;
+ break;
+ case UAC_GET_MEM:
+ break;
+ default:
+ break;
+ }
+
+ return value;
+}
+
+static int
+f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
+{
+ struct usb_composite_dev *cdev = f->config->cdev;
+ struct usb_request *req = cdev->req;
+ int value = -EOPNOTSUPP;
+ u16 w_index = le16_to_cpu(ctrl->wIndex);
+ u16 w_value = le16_to_cpu(ctrl->wValue);
+ u16 w_length = le16_to_cpu(ctrl->wLength);
+
+ /* composite driver infrastructure handles everything; interface
+ * activation uses set_alt().
+ */
+ switch (ctrl->bRequestType) {
+ case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
+ value = audio_set_endpoint_req(f, ctrl);
+ break;
+
+ case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
+ value = audio_get_endpoint_req(f, ctrl);
+ break;
+
+ default:
+ ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
+ ctrl->bRequestType, ctrl->bRequest,
+ w_value, w_index, w_length);
+ }
+
+ /* respond with data transfer or status phase? */
+ if (value >= 0) {
+ DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n",
+ ctrl->bRequestType, ctrl->bRequest,
+ w_value, w_index, w_length);
+ req->zero = 0;
+ req->length = value;
+ value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
+ if (value < 0)
+ ERROR(cdev, "audio response on err %d\n", value);
+ }
+
+ /* device either stalls (value < 0) or reports success */
+ return value;
+}
+
+static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
+{
+ struct usb_composite_dev *cdev = f->config->cdev;
+ struct usb_gadget *gadget = cdev->gadget;
+ struct device *dev = &gadget->dev;
+ struct f_uac1 *uac1 = func_to_uac1(f);
+ int ret = 0;
+
+ /* No i/f has more than 2 alt settings */
+ if (alt > 1) {
+ dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
+ return -EINVAL;
+ }
+
+ if (intf == uac1->ac_intf) {
+ /* Control I/f has only 1 AltSetting - 0 */
+ if (alt) {
+ dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
+ return -EINVAL;
+ }
+ return 0;
+ }
+
+ if (intf == uac1->as_out_intf) {
+ uac1->as_out_alt = alt;
+
+ if (alt)
+ ret = u_audio_start_capture(&uac1->g_audio);
+ else
+ u_audio_stop_capture(&uac1->g_audio);
+ } else if (intf == uac1->as_in_intf) {
+ uac1->as_in_alt = alt;
+
+ if (alt)
+ ret = u_audio_start_playback(&uac1->g_audio);
+ else
+ u_audio_stop_playback(&uac1->g_audio);
+ } else {
+ dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static int f_audio_get_alt(struct usb_function *f, unsigned intf)
+{
+ struct usb_composite_dev *cdev = f->config->cdev;
+ struct usb_gadget *gadget = cdev->gadget;
+ struct device *dev = &gadget->dev;
+ struct f_uac1 *uac1 = func_to_uac1(f);
+
+ if (intf == uac1->ac_intf)
+ return uac1->ac_alt;
+ else if (intf == uac1->as_out_intf)
+ return uac1->as_out_alt;
+ else if (intf == uac1->as_in_intf)
+ return uac1->as_in_alt;
+ else
+ dev_err(dev, "%s:%d Invalid Interface %d!\n",
+ __func__, __LINE__, intf);
+
+ return -EINVAL;
+}
+
+
+static void f_audio_disable(struct usb_function *f)
+{
+ struct f_uac1 *uac1 = func_to_uac1(f);
+
+ uac1->as_out_alt = 0;
+ uac1->as_in_alt = 0;
+
+ u_audio_stop_capture(&uac1->g_audio);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* audio function driver setup/binding */
+static int f_audio_bind(struct usb_configuration *c, struct usb_function *f)
+{
+ struct usb_composite_dev *cdev = c->cdev;
+ struct usb_gadget *gadget = cdev->gadget;
+ struct f_uac1 *uac1 = func_to_uac1(f);
+ struct g_audio *audio = func_to_g_audio(f);
+ struct f_uac1_newapi_opts *audio_opts;
+ struct usb_ep *ep = NULL;
+ struct usb_string *us;
+ u8 *sam_freq;
+ int rate;
+ int status;
+
+ audio_opts = container_of(f->fi, struct f_uac1_newapi_opts, func_inst);
+
+ us = usb_gstrings_attach(cdev, uac1_strings, ARRAY_SIZE(strings_uac1));
+ if (IS_ERR(us))
+ return PTR_ERR(us);
+ ac_interface_desc.iInterface = us[STR_AC_IF].id;
+ usb_out_it_desc.iTerminal = us[STR_USB_OUT_IT].id;
+ usb_out_it_desc.iChannelNames = us[STR_USB_OUT_IT_CH_NAMES].id;
+ io_out_ot_desc.iTerminal = us[STR_IO_OUT_OT].id;
+ as_out_interface_alt_0_desc.iInterface = us[STR_AS_OUT_IF_ALT0].id;
+ as_out_interface_alt_1_desc.iInterface = us[STR_AS_OUT_IF_ALT1].id;
+ io_in_it_desc.iTerminal = us[STR_IO_IN_IT].id;
+ io_in_it_desc.iChannelNames = us[STR_IO_IN_IT_CH_NAMES].id;
+ usb_in_ot_desc.iTerminal = us[STR_USB_IN_OT].id;
+ as_in_interface_alt_0_desc.iInterface = us[STR_AS_IN_IF_ALT0].id;
+ as_in_interface_alt_1_desc.iInterface = us[STR_AS_IN_IF_ALT1].id;
+
+ /* Set channel numbers */
+ usb_out_it_desc.bNrChannels = num_channels(audio_opts->c_chmask);
+ usb_out_it_desc.wChannelConfig = cpu_to_le16(audio_opts->c_chmask);
+ as_out_type_i_desc.bNrChannels = num_channels(audio_opts->c_chmask);
+ as_out_type_i_desc.bSubframeSize = audio_opts->c_ssize;
+ as_out_type_i_desc.bBitResolution = audio_opts->c_ssize * 8;
+ io_in_it_desc.bNrChannels = num_channels(audio_opts->p_chmask);
+ io_in_it_desc.wChannelConfig = cpu_to_le16(audio_opts->p_chmask);
+ as_in_type_i_desc.bNrChannels = num_channels(audio_opts->p_chmask);
+ as_in_type_i_desc.bSubframeSize = audio_opts->p_ssize;
+ as_in_type_i_desc.bBitResolution = audio_opts->p_ssize * 8;
+
+ /* Set sample rates */
+ rate = audio_opts->c_srate;
+ sam_freq = as_out_type_i_desc.tSamFreq[0];
+ memcpy(sam_freq, &rate, 3);
+ rate = audio_opts->p_srate;
+ sam_freq = as_in_type_i_desc.tSamFreq[0];
+ memcpy(sam_freq, &rate, 3);
+
+ /* allocate instance-specific interface IDs, and patch descriptors */
+ status = usb_interface_id(c, f);
+ if (status < 0)
+ goto fail;
+ ac_interface_desc.bInterfaceNumber = status;
+ uac1->ac_intf = status;
+ uac1->ac_alt = 0;
+
+ status = usb_interface_id(c, f);
+ if (status < 0)
+ goto fail;
+ as_out_interface_alt_0_desc.bInterfaceNumber = status;
+ as_out_interface_alt_1_desc.bInterfaceNumber = status;
+ uac1->as_out_intf = status;
+ uac1->as_out_alt = 0;
+
+ status = usb_interface_id(c, f);
+ if (status < 0)
+ goto fail;
+ as_in_interface_alt_0_desc.bInterfaceNumber = status;
+ as_in_interface_alt_1_desc.bInterfaceNumber = status;
+ uac1->as_in_intf = status;
+ uac1->as_in_alt = 0;
+
+ audio->gadget = gadget;
+
+ status = -ENODEV;
+
+ /* allocate instance-specific endpoints */
+ ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc);
+ if (!ep)
+ goto fail;
+ audio->out_ep = ep;
+ audio->out_ep->desc = &as_out_ep_desc;
+
+ ep = usb_ep_autoconfig(cdev->gadget, &as_in_ep_desc);
+ if (!ep)
+ goto fail;
+ audio->in_ep = ep;
+ audio->in_ep->desc = &as_in_ep_desc;
+
+ /* copy descriptors, and track endpoint copies */
+ status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc, NULL,
+ NULL);
+ if (status)
+ goto fail;
+
+ audio->out_ep_maxpsize = as_out_ep_desc.wMaxPacketSize;
+ audio->in_ep_maxpsize = as_in_ep_desc.wMaxPacketSize;
+ audio->params.c_chmask = audio_opts->c_chmask;
+ audio->params.c_srate = audio_opts->c_srate;
+ audio->params.c_ssize = audio_opts->c_ssize;
+ audio->params.p_chmask = audio_opts->p_chmask;
+ audio->params.p_srate = audio_opts->p_srate;
+ audio->params.p_ssize = audio_opts->p_ssize;
+
+ status = g_audio_setup(audio, "UAC1_PCM", "UAC1_Gadget");
+ if (status)
+ goto err_card_register;
+
+ return 0;
+
+err_card_register:
+ usb_free_all_descriptors(f);
+fail:
+ return status;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static inline struct
+f_uac1_newapi_opts *to_f_uac1_newapi_opts(struct config_item *item)
+{
+ return container_of(to_config_group(item), struct f_uac1_newapi_opts,
+ func_inst.group);
+}
+
+static void f_uac1_attr_release(struct config_item *item)
+{
+ struct f_uac1_newapi_opts *opts = to_f_uac1_newapi_opts(item);
+
+ usb_put_function_instance(&opts->func_inst);
+}
+
+static struct configfs_item_operations f_uac1_item_ops = {
+ .release = f_uac1_attr_release,
+};
+
+#define UAC1_ATTRIBUTE(name) \
+static ssize_t f_uac1_newapi_opts_##name##_show( \
+ struct config_item *item, \
+ char *page) \
+{ \
+ struct f_uac1_newapi_opts *opts = to_f_uac1_newapi_opts(item); \
+ int result; \
+ \
+ mutex_lock(&opts->lock); \
+ result = sprintf(page, "%u\n", opts->name); \
+ mutex_unlock(&opts->lock); \
+ \
+ return result; \
+} \
+ \
+static ssize_t f_uac1_newapi_opts_##name##_store( \
+ struct config_item *item, \
+ const char *page, size_t len) \
+{ \
+ struct f_uac1_newapi_opts *opts = to_f_uac1_newapi_opts(item); \
+ int ret; \
+ u32 num; \
+ \
+ mutex_lock(&opts->lock); \
+ if (opts->refcnt) { \
+ ret = -EBUSY; \
+ goto end; \
+ } \
+ \
+ ret = kstrtou32(page, 0, &num); \
+ if (ret) \
+ goto end; \
+ \
+ opts->name = num; \
+ ret = len; \
+ \
+end: \
+ mutex_unlock(&opts->lock); \
+ return ret; \
+} \
+ \
+CONFIGFS_ATTR(f_uac1_newapi_opts_, name)
+
+UAC1_ATTRIBUTE(c_chmask);
+UAC1_ATTRIBUTE(c_srate);
+UAC1_ATTRIBUTE(c_ssize);
+UAC1_ATTRIBUTE(p_chmask);
+UAC1_ATTRIBUTE(p_srate);
+UAC1_ATTRIBUTE(p_ssize);
+
+static struct configfs_attribute *f_uac1_attrs[] = {
+ &f_uac1_newapi_opts_attr_c_chmask,
+ &f_uac1_newapi_opts_attr_c_srate,
+ &f_uac1_newapi_opts_attr_c_ssize,
+ &f_uac1_newapi_opts_attr_p_chmask,
+ &f_uac1_newapi_opts_attr_p_srate,
+ &f_uac1_newapi_opts_attr_p_ssize,
+ NULL,
+};
+
+static struct config_item_type f_uac1_func_type = {
+ .ct_item_ops = &f_uac1_item_ops,
+ .ct_attrs = f_uac1_attrs,
+ .ct_owner = THIS_MODULE,
+};
+
+static void f_audio_free_inst(struct usb_function_instance *f)
+{
+ struct f_uac1_newapi_opts *opts;
+
+ opts = container_of(f, struct f_uac1_newapi_opts, func_inst);
+ kfree(opts);
+}
+
+static struct usb_function_instance *f_audio_alloc_inst(void)
+{
+ struct f_uac1_newapi_opts *opts;
+
+ opts = kzalloc(sizeof(*opts), GFP_KERNEL);
+ if (!opts)
+ return ERR_PTR(-ENOMEM);
+
+ mutex_init(&opts->lock);
+ opts->func_inst.free_func_inst = f_audio_free_inst;
+
+ config_group_init_type_name(&opts->func_inst.group, "",
+ &f_uac1_func_type);
+
+ opts->c_chmask = UAC1_DEF_CCHMASK;
+ opts->c_srate = UAC1_DEF_CSRATE;
+ opts->c_ssize = UAC1_DEF_CSSIZE;
+ opts->p_chmask = UAC1_DEF_PCHMASK;
+ opts->p_srate = UAC1_DEF_PSRATE;
+ opts->p_ssize = UAC1_DEF_PSSIZE;
+ return &opts->func_inst;
+}
+
+static void f_audio_free(struct usb_function *f)
+{
+ struct g_audio *audio;
+ struct f_uac1_newapi_opts *opts;
+
+ audio = func_to_g_audio(f);
+ opts = container_of(f->fi, struct f_uac1_newapi_opts, func_inst);
+ kfree(audio);
+ mutex_lock(&opts->lock);
+ --opts->refcnt;
+ mutex_unlock(&opts->lock);
+}
+
+static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
+{
+ struct g_audio *audio = func_to_g_audio(f);
+
+ g_audio_cleanup(audio);
+ usb_free_all_descriptors(f);
+
+ audio->gadget = NULL;
+}
+
+static struct usb_function *f_audio_alloc(struct usb_function_instance *fi)
+{
+ struct f_uac1 *uac1;
+ struct f_uac1_newapi_opts *opts;
+
+ /* allocate and initialize one new instance */
+ uac1 = kzalloc(sizeof(*uac1), GFP_KERNEL);
+ if (!uac1)
+ return ERR_PTR(-ENOMEM);
+
+ opts = container_of(fi, struct f_uac1_newapi_opts, func_inst);
+ mutex_lock(&opts->lock);
+ ++opts->refcnt;
+ mutex_unlock(&opts->lock);
+
+ uac1->g_audio.func.name = "uac1_newapi_func";
+ uac1->g_audio.func.bind = f_audio_bind;
+ uac1->g_audio.func.unbind = f_audio_unbind;
+ uac1->g_audio.func.set_alt = f_audio_set_alt;
+ uac1->g_audio.func.get_alt = f_audio_get_alt;
+ uac1->g_audio.func.setup = f_audio_setup;
+ uac1->g_audio.func.disable = f_audio_disable;
+ uac1->g_audio.func.free_func = f_audio_free;
+
+ return &uac1->g_audio.func;
+}
+
+DECLARE_USB_FUNCTION_INIT(uac1_newapi, f_audio_alloc_inst, f_audio_alloc);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ruslan Bilovol");
diff --git a/drivers/usb/gadget/function/u_uac1_newapi.h b/drivers/usb/gadget/function/u_uac1_newapi.h
new file mode 100644
index 0000000..2fcc3cf2
--- /dev/null
+++ b/drivers/usb/gadget/function/u_uac1_newapi.h
@@ -0,0 +1,39 @@
+/*
+ * u_uac1_newapi.h - Utility definitions for UAC1 function
+ *
+ * Copyright (C) 2016 Ruslan Bilovol <ruslan.bilovol@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __U_UAC1_NEWAPI_H
+#define __U_UAC1_NEWAPI_H
+
+#include <linux/usb/composite.h>
+
+#define UAC1_OUT_EP_MAX_PACKET_SIZE 200
+#define UAC1_DEF_CCHMASK 0x3
+#define UAC1_DEF_CSRATE 48000
+#define UAC1_DEF_CSSIZE 2
+#define UAC1_DEF_PCHMASK 0x3
+#define UAC1_DEF_PSRATE 48000
+#define UAC1_DEF_PSSIZE 2
+
+
+struct f_uac1_newapi_opts {
+ struct usb_function_instance func_inst;
+ int c_chmask;
+ int c_srate;
+ int c_ssize;
+ int p_chmask;
+ int p_srate;
+ int p_ssize;
+ unsigned bound:1;
+
+ struct mutex lock;
+ int refcnt;
+};
+
+#endif /* __U_UAC1_NEWAPI_H */
diff --git a/drivers/usb/gadget/legacy/Kconfig b/drivers/usb/gadget/legacy/Kconfig
index 5344064..9757a3a 100644
--- a/drivers/usb/gadget/legacy/Kconfig
+++ b/drivers/usb/gadget/legacy/Kconfig
@@ -54,9 +54,10 @@ config USB_AUDIO
depends on SND
select USB_LIBCOMPOSITE
select SND_PCM
- select USB_F_UAC1 if GADGET_UAC1
+ select USB_F_UAC1 if (GADGET_UAC1 && !GADGET_UAC1_NEWAPI)
+ select USB_F_UAC1_NEWAPI if (GADGET_UAC1 && GADGET_UAC1_NEWAPI)
select USB_F_UAC2 if !GADGET_UAC1
- select USB_U_AUDIO if USB_F_UAC2
+ select USB_U_AUDIO if (USB_F_UAC2 || USB_F_UAC1_NEWAPI)
help
This Gadget Audio driver is compatible with USB Audio Class
specification 2.0. It implements 1 AudioControl interface,
@@ -81,6 +82,16 @@ config GADGET_UAC1
paths hardwired to the Audio codec chip on-board and doesn't work
without one.
+config GADGET_UAC1_NEWAPI
+ bool "Use new API (u_audio) for UAC 1.0 driver"
+ depends on GADGET_UAC1
+ help
+ This is an alternative UAC Spec-1.0 driver implementation
+ that uses new API (u_audio), and doesn't expect any real
+ audio codec to be present on the device (the audio streams
+ are simply sinked to and sourced from a virtual ALSA sound
+ card created)
+
config USB_ETH
tristate "Ethernet Gadget (with CDC Ethernet support)"
depends on NET
diff --git a/drivers/usb/gadget/legacy/audio.c b/drivers/usb/gadget/legacy/audio.c
index 5d7b3c6..1debabc 100644
--- a/drivers/usb/gadget/legacy/audio.c
+++ b/drivers/usb/gadget/legacy/audio.c
@@ -53,6 +53,39 @@ static int c_ssize = UAC2_DEF_CSSIZE;
module_param(c_ssize, uint, S_IRUGO);
MODULE_PARM_DESC(c_ssize, "Capture Sample Size(bytes)");
#else
+#ifdef CONFIG_GADGET_UAC1_NEWAPI
+#include "u_uac1_newapi.h"
+
+/* Playback(USB-IN) Default Stereo - Fl/Fr */
+static int p_chmask = UAC1_DEF_PCHMASK;
+module_param(p_chmask, uint, S_IRUGO);
+MODULE_PARM_DESC(p_chmask, "Playback Channel Mask");
+
+/* Playback Default 48 KHz */
+static int p_srate = UAC1_DEF_PSRATE;
+module_param(p_srate, uint, S_IRUGO);
+MODULE_PARM_DESC(p_srate, "Playback Sampling Rate");
+
+/* Playback Default 16bits/sample */
+static int p_ssize = UAC1_DEF_PSSIZE;
+module_param(p_ssize, uint, S_IRUGO);
+MODULE_PARM_DESC(p_ssize, "Playback Sample Size(bytes)");
+
+/* Capture(USB-OUT) Default Stereo - Fl/Fr */
+static int c_chmask = UAC1_DEF_CCHMASK;
+module_param(c_chmask, uint, S_IRUGO);
+MODULE_PARM_DESC(c_chmask, "Capture Channel Mask");
+
+/* Capture Default 48 KHz */
+static int c_srate = UAC1_DEF_CSRATE;
+module_param(c_srate, uint, S_IRUGO);
+MODULE_PARM_DESC(c_srate, "Capture Sampling Rate");
+
+/* Capture Default 16bits/sample */
+static int c_ssize = UAC1_DEF_CSSIZE;
+module_param(c_ssize, uint, S_IRUGO);
+MODULE_PARM_DESC(c_ssize, "Capture Sample Size(bytes)");
+#else /* CONFIG_GADGET_UAC1_NEWAPI */
#include "u_uac1.h"
static char *fn_play = FILE_PCM_PLAYBACK;
@@ -78,6 +111,7 @@ MODULE_PARM_DESC(req_count, "ISO OUT endpoint request count");
static int audio_buf_size = UAC1_AUDIO_BUF_SIZE;
module_param(audio_buf_size, int, S_IRUGO);
MODULE_PARM_DESC(audio_buf_size, "Audio buffer size");
+#endif /* CONFIG_GADGET_UAC1_NEWAPI */
#endif
/* string IDs are assigned dynamically */
@@ -207,8 +241,12 @@ static int audio_bind(struct usb_composite_dev *cdev)
#ifndef CONFIG_GADGET_UAC1
struct f_uac2_opts *uac2_opts;
#else
+#ifdef CONFIG_GADGET_UAC1_NEWAPI
+ struct f_uac1_newapi_opts *uac1_opts;
+#else
struct f_uac1_opts *uac1_opts;
#endif
+#endif
int status;
#ifndef CONFIG_GADGET_UAC1
@@ -216,7 +254,11 @@ static int audio_bind(struct usb_composite_dev *cdev)
if (IS_ERR(fi_uac2))
return PTR_ERR(fi_uac2);
#else
+#ifdef CONFIG_GADGET_UAC1_NEWAPI
+ fi_uac1 = usb_get_function_instance("uac1_newapi");
+#else
fi_uac1 = usb_get_function_instance("uac1");
+#endif
if (IS_ERR(fi_uac1))
return PTR_ERR(fi_uac1);
#endif
@@ -230,6 +272,15 @@ static int audio_bind(struct usb_composite_dev *cdev)
uac2_opts->c_srate = c_srate;
uac2_opts->c_ssize = c_ssize;
#else
+#ifdef CONFIG_GADGET_UAC1_NEWAPI
+ uac1_opts = container_of(fi_uac1, struct f_uac1_newapi_opts, func_inst);
+ uac1_opts->p_chmask = p_chmask;
+ uac1_opts->p_srate = p_srate;
+ uac1_opts->p_ssize = p_ssize;
+ uac1_opts->c_chmask = c_chmask;
+ uac1_opts->c_srate = c_srate;
+ uac1_opts->c_ssize = c_ssize;
+#else /* CONFIG_GADGET_UAC1_NEWAPI */
uac1_opts = container_of(fi_uac1, struct f_uac1_opts, func_inst);
uac1_opts->fn_play = fn_play;
uac1_opts->fn_cap = fn_cap;
@@ -237,6 +288,7 @@ static int audio_bind(struct usb_composite_dev *cdev)
uac1_opts->req_buf_size = req_buf_size;
uac1_opts->req_count = req_count;
uac1_opts->audio_buf_size = audio_buf_size;
+#endif /* CONFIG_GADGET_UAC1_NEWAPI */
#endif
status = usb_string_ids_tab(cdev, strings_dev);
--
1.9.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH v3 0/3] USB Audio Gadget refactoring
2016-08-17 20:49 [PATCH v3 0/3] USB Audio Gadget refactoring Ruslan Bilovol
` (2 preceding siblings ...)
2016-08-17 20:49 ` [PATCH v3 3/3] usb: gadget: add f_uac1 variant based on new u_audio api Ruslan Bilovol
@ 2016-08-29 8:05 ` Felipe Balbi
2017-02-04 14:06 ` Ruslan Bilovol
3 siblings, 1 reply; 6+ messages in thread
From: Felipe Balbi @ 2016-08-29 8:05 UTC (permalink / raw)
To: Ruslan Bilovol
Cc: Daniel Mack, Jassi Brar, Clemens Ladisch, Jonathan Corbet,
Greg Kroah-Hartman, Peter Chen, linux-usb, linux-doc,
linux-kernel
[-- Attachment #1: Type: text/plain, Size: 2623 bytes --]
Hi,
Ruslan Bilovol <ruslan.bilovol@gmail.com> writes:
> I came to this patch series when wanted to do two things:
> - use UAC1 as virtual ALSA sound card on gadget side,
> just like UAC2 is used so it's possible to do rate
> resampling
> - have both playback/capture support in UAC1
>
> Since I wanted to have same behavior for both UAC1/UAC2,
> obviously I've got an utility part (u_audio.c) for
> virtual ALSA sound card handling like we have
> for ethernet(u_ether) or serial(u_serial) functions.
> Function-specific parts (f_uac1/f_uac2) became almost
> as storage for class-specific USB descriptors, some
> boilerplate for configfs, binding and few USB
> config request handling.
>
> Originally in RFC [1] I've posted before, there was
> major change to f_uac1 after that it couldn't do
> direct play to existing ALSA sound card anymore,
> representing audio on gadget side as virtual
> ALSA sound card where audio streams are simply
> sinked to and sourced from it, so it may break
> current usecase for some people (and that's why
> it was RFC).
>
> During RFC discussion, it was agreed to not touch
> existing f_uac1 implementation and create new one
> instead. This patchset (v2) introduced new function
> named f_uac1_newapi and doesn't touch current f_uac1
> implementation, so people still can use old behavior
>
> Now, it's possible to use existing user-space
> applications for audio routing between Audio Gadget
> and real sound card. I personally use alsaloop tool
> from alsautils and have ability to create PCM
> loopback between two different ALSA cards using
> rate resampling, which was not possible with previous
> "direct play to ALSA card" approach in f_uac1.
>
> While here, also dropped redundant platform
> driver/device creation in f_uac2 driver (as well as
> didn't add "never implemented" volume/mute functionality
> in f_uac1 to f_uac1_newapi) that made this work even
> easier to do.
>
> This series is tested with both legacy g_audio.ko and
> modern configfs approaches under Ubuntu 14.04 (UAC1 and
> UAC2) and under Windows7 x64 (UAC1 only) having
> perfect results in all cases.
>
> Comments, testing are welcome.
>
> v3 changes:
> - renamed u_audio exported symbols so they don't
> conflict with old f_uac1 if both are built-in.
>
> v2 changes:
> - do not touch f_uac1, instead created f_uac1_newapi
f_uac1_newapi???? What the hell man? :-s
Sure you can't change f_uac1 to newapi without introducing userland
visible changes? We really don't want to add another copy of f_uac1,
sorry.
--
balbi
[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 800 bytes --]
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v3 0/3] USB Audio Gadget refactoring
2016-08-29 8:05 ` [PATCH v3 0/3] USB Audio Gadget refactoring Felipe Balbi
@ 2017-02-04 14:06 ` Ruslan Bilovol
0 siblings, 0 replies; 6+ messages in thread
From: Ruslan Bilovol @ 2017-02-04 14:06 UTC (permalink / raw)
To: Felipe Balbi
Cc: Daniel Mack, Jassi Brar, Clemens Ladisch, Jonathan Corbet,
Greg Kroah-Hartman, Peter Chen, linux-usb, linux-doc,
linux-kernel
Hi Felipe,
On Mon, Aug 29, 2016 at 11:05 AM, Felipe Balbi <balbi@kernel.org> wrote:
>
> Hi,
>
> Ruslan Bilovol <ruslan.bilovol@gmail.com> writes:
>> I came to this patch series when wanted to do two things:
>> - use UAC1 as virtual ALSA sound card on gadget side,
>> just like UAC2 is used so it's possible to do rate
>> resampling
>> - have both playback/capture support in UAC1
>>
>> Since I wanted to have same behavior for both UAC1/UAC2,
>> obviously I've got an utility part (u_audio.c) for
>> virtual ALSA sound card handling like we have
>> for ethernet(u_ether) or serial(u_serial) functions.
>> Function-specific parts (f_uac1/f_uac2) became almost
>> as storage for class-specific USB descriptors, some
>> boilerplate for configfs, binding and few USB
>> config request handling.
>>
>> Originally in RFC [1] I've posted before, there was
>> major change to f_uac1 after that it couldn't do
>> direct play to existing ALSA sound card anymore,
>> representing audio on gadget side as virtual
>> ALSA sound card where audio streams are simply
>> sinked to and sourced from it, so it may break
>> current usecase for some people (and that's why
>> it was RFC).
>>
>> During RFC discussion, it was agreed to not touch
>> existing f_uac1 implementation and create new one
>> instead. This patchset (v2) introduced new function
>> named f_uac1_newapi and doesn't touch current f_uac1
>> implementation, so people still can use old behavior
>>
>> Now, it's possible to use existing user-space
>> applications for audio routing between Audio Gadget
>> and real sound card. I personally use alsaloop tool
>> from alsautils and have ability to create PCM
>> loopback between two different ALSA cards using
>> rate resampling, which was not possible with previous
>> "direct play to ALSA card" approach in f_uac1.
>>
>> While here, also dropped redundant platform
>> driver/device creation in f_uac2 driver (as well as
>> didn't add "never implemented" volume/mute functionality
>> in f_uac1 to f_uac1_newapi) that made this work even
>> easier to do.
>>
>> This series is tested with both legacy g_audio.ko and
>> modern configfs approaches under Ubuntu 14.04 (UAC1 and
>> UAC2) and under Windows7 x64 (UAC1 only) having
>> perfect results in all cases.
>>
>> Comments, testing are welcome.
>>
>> v3 changes:
>> - renamed u_audio exported symbols so they don't
>> conflict with old f_uac1 if both are built-in.
>>
>> v2 changes:
>> - do not touch f_uac1, instead created f_uac1_newapi
>
> f_uac1_newapi???? What the hell man? :-s
Yes, sometimes it's difficult to create laconic name that shows
difference to old f_uac1. We can name it alternatively
"f_uac1_alsa" or maybe anybody else have good idea here.
I just wanted to show here that it's f_uac1 with completely
different functionality (expose ALSA card to userspace
instead of consuming existing one)
>
> Sure you can't change f_uac1 to newapi without introducing userland
> visible changes? We really don't want to add another copy of f_uac1,
> sorry.
Do you mean same f_uac1.ko module will be able to use existing
ALSA card (old api) and create it own as well (new api) in the same
time at runtime?
By the way, while I understand your desire to not introduce
userland visible changes, in this particular case it doesn't
make much sense, since that's, again, two opposite approaches
to consume and transfer data to userspace
Moreover, now old f_uac1 and new f_uac1_newapi have
different functionality exposed to host (first one has only
playback, second one - playback+capture), so even USB
descriptors are different.
So userspace compatibility in this case will make f_uac1
driver too difficult to maintain and add new functionality.
So I prefer to keep the new version of f_uac1 function
and let it move forward with new features.
Best regards,
Ruslan
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2017-02-04 14:06 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2016-08-17 20:49 [PATCH v3 0/3] USB Audio Gadget refactoring Ruslan Bilovol
2016-08-17 20:49 ` [PATCH v3 1/3] usb: gadget: f_uac2: remove platform driver/device creation Ruslan Bilovol
2016-08-17 20:49 ` [PATCH v3 2/3] usb: gadget: f_uac2: split out audio core Ruslan Bilovol
2016-08-17 20:49 ` [PATCH v3 3/3] usb: gadget: add f_uac1 variant based on new u_audio api Ruslan Bilovol
2016-08-29 8:05 ` [PATCH v3 0/3] USB Audio Gadget refactoring Felipe Balbi
2017-02-04 14:06 ` Ruslan Bilovol
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