[RFC PATCH 1/5] usb: gadget: f_uac2: remove platform driver/device creation

From: Ruslan Bilovol
Date: Mon May 23 2016 - 19:51:04 EST

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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@xxxxxxxxx>
---
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 186d4b1..8b46f05 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 ------------- */

@@ -971,7 +919,7 @@ 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__);
}

@@ -1005,7 +953,7 @@ 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;
@@ -1076,6 +1024,8 @@ 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__);
@@ -1121,7 +1071,7 @@ 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;
@@ -1131,6 +1081,7 @@ err_free_descs:
err:
kfree(agdev->uac2.p_prm.rbuf);
kfree(agdev->uac2.c_prm.rbuf);
+ agdev->gadget = NULL;
return -EINVAL;
}

@@ -1141,7 +1092,7 @@ 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;
@@ -1242,7 +1193,6 @@ 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;
@@ -1251,7 +1201,7 @@ 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);

@@ -1276,7 +1226,6 @@ 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);
@@ -1304,7 +1253,7 @@ 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);
}
@@ -1317,7 +1266,6 @@ 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);
@@ -1347,7 +1295,7 @@ 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);
}
@@ -1383,12 +1331,11 @@ 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;
}
@@ -1406,7 +1353,6 @@ 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;
@@ -1418,14 +1364,15 @@ 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;
}
@@ -1564,7 +1511,7 @@ 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);
@@ -1572,6 +1519,8 @@ 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

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