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usb: gadget: f_uac1: add configfs support 

Add support for using f_uac1 function as a component of a gadget
composed with configfs.

Tested-by: Sebastian Reimers <sebastian.reimers@googlemail.com>
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Andrzej Pietrasiewicz 2014-07-22 19:58:43 +02:00 committed by Felipe Balbi
parent bcec9784dd
commit 0854611a19
3 changed files with 176 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
Documentation/ABI/testing/configfs-usb-gadget-uac1 Normal file
View File

@ -0,0 +1,12 @@
What: /config/usb-gadget/gadget/functions/uac1.name
Date: Sep 2014
KernelVersion: 3.18
Description:
The attributes:
audio_buf_size - audio buffer size
fn_cap - capture pcm device file name
fn_cntl - control device file name
fn_play - playback pcm device file name
req_buf_size - ISO OUT endpoint request buffer size
req_count - ISO OUT endpoint request count

158
drivers/usb/gadget/function/f_uac1.c
View File

@ -760,12 +760,150 @@ static int control_selector_init(struct f_audio *audio)
return 0;
}
static inline struct f_uac1_opts *to_f_uac1_opts(struct config_item *item)
{
return container_of(to_config_group(item), struct f_uac1_opts,
func_inst.group);
}
CONFIGFS_ATTR_STRUCT(f_uac1_opts);
CONFIGFS_ATTR_OPS(f_uac1_opts);
static void f_uac1_attr_release(struct config_item *item)
{
struct f_uac1_opts *opts = to_f_uac1_opts(item);
usb_put_function_instance(&opts->func_inst);
}
static struct configfs_item_operations f_uac1_item_ops = {
.release = f_uac1_attr_release,
.show_attribute = f_uac1_opts_attr_show,
.store_attribute = f_uac1_opts_attr_store,
};
#define UAC1_INT_ATTRIBUTE(name) \
static ssize_t f_uac1_opts_##name##_show(struct f_uac1_opts *opts, \
char *page) \
{ \
int result; \
\
mutex_lock(&opts->lock); \
result = sprintf(page, "%u\n", opts->name); \
mutex_unlock(&opts->lock); \
\
return result; \
} \
\
static ssize_t f_uac1_opts_##name##_store(struct f_uac1_opts *opts, \
const char *page, size_t len) \
{ \
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; \
} \
\
static struct f_uac1_opts_attribute f_uac1_opts_##name = \
__CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR, \
f_uac1_opts_##name##_show, \
f_uac1_opts_##name##_store)
UAC1_INT_ATTRIBUTE(req_buf_size);
UAC1_INT_ATTRIBUTE(req_count);
UAC1_INT_ATTRIBUTE(audio_buf_size);
#define UAC1_STR_ATTRIBUTE(name) \
static ssize_t f_uac1_opts_##name##_show(struct f_uac1_opts *opts, \
char *page) \
{ \
int result; \
\
mutex_lock(&opts->lock); \
result = sprintf(page, "%s\n", opts->name); \
mutex_unlock(&opts->lock); \
\
return result; \
} \
\
static ssize_t f_uac1_opts_##name##_store(struct f_uac1_opts *opts, \
const char *page, size_t len) \
{ \
int ret = -EBUSY; \
char *tmp; \
\
mutex_lock(&opts->lock); \
if (opts->refcnt) \
goto end; \
\
tmp = kstrndup(page, len, GFP_KERNEL); \
if (tmp) { \
ret = -ENOMEM; \
goto end; \
} \
if (opts->name##_alloc) \
kfree(opts->name); \
opts->name##_alloc = true; \
opts->name = tmp; \
ret = len; \
\
end: \
mutex_unlock(&opts->lock); \
return ret; \
} \
\
static struct f_uac1_opts_attribute f_uac1_opts_##name = \
__CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR, \
f_uac1_opts_##name##_show, \
f_uac1_opts_##name##_store)
UAC1_STR_ATTRIBUTE(fn_play);
UAC1_STR_ATTRIBUTE(fn_cap);
UAC1_STR_ATTRIBUTE(fn_cntl);
static struct configfs_attribute *f_uac1_attrs[] = {
&f_uac1_opts_req_buf_size.attr,
&f_uac1_opts_req_count.attr,
&f_uac1_opts_audio_buf_size.attr,
&f_uac1_opts_fn_play.attr,
&f_uac1_opts_fn_cap.attr,
&f_uac1_opts_fn_cntl.attr,
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_opts *opts;
opts = container_of(f, struct f_uac1_opts, func_inst);
gaudio_cleanup(opts->card);
if (opts->fn_play_alloc)
kfree(opts->fn_play);
if (opts->fn_cap_alloc)
kfree(opts->fn_cap);
if (opts->fn_cntl_alloc)
kfree(opts->fn_cntl);
kfree(opts);
}
@ -777,16 +915,31 @@ static struct usb_function_instance *f_audio_alloc_inst(void)
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->req_buf_size = UAC1_OUT_EP_MAX_PACKET_SIZE;
opts->req_count = UAC1_REQ_COUNT;
opts->audio_buf_size = UAC1_AUDIO_BUF_SIZE;
opts->fn_play = FILE_PCM_PLAYBACK;
opts->fn_cap = FILE_PCM_CAPTURE;
opts->fn_cntl = FILE_CONTROL;
return &opts->func_inst;
}
static void f_audio_free(struct usb_function *f)
{
struct f_audio *audio = func_to_audio(f);
struct f_uac1_opts *opts;
opts = container_of(f->fi, struct f_uac1_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)
@ -797,6 +950,7 @@ static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
static struct usb_function *f_audio_alloc(struct usb_function_instance *fi)
{
struct f_audio *audio;
struct f_uac1_opts *opts;
/* allocate and initialize one new instance */
audio = kzalloc(sizeof(*audio), GFP_KERNEL);
@ -805,6 +959,10 @@ static struct usb_function *f_audio_alloc(struct usb_function_instance *fi)
audio->card.func.name = "g_audio";
opts = container_of(fi, struct f_uac1_opts, func_inst);
mutex_lock(&opts->lock);
++opts->refcnt;
mutex_unlock(&opts->lock);
INIT_LIST_HEAD(&audio->play_queue);
spin_lock_init(&audio->lock);

7
drivers/usb/gadget/function/u_uac1.h
View File

@ -66,8 +66,13 @@ struct f_uac1_opts {
char *fn_play;
char *fn_cap;
char *fn_cntl;
bool bound;
unsigned bound:1;
unsigned fn_play_alloc:1;
unsigned fn_cap_alloc:1;
unsigned fn_cntl_alloc:1;
struct gaudio *card;
struct mutex lock;
int refcnt;
};
int gaudio_setup(struct gaudio *card);