| Message ID | 20230723190538.27750-1-quic_akakum@quicinc.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [v2] usb: gadget: f_uac2: uevent changes for uac2 | expand |
On Mon, Jul 24, 2023 at 12:35:38AM +0530, Akash Kumar wrote: > Adding uevent from usb audio gadget driver for uac2 playback/capture > events, which userspace reads and later reads sysfs entry to know if > playback or capture has stopped or started by host application. How do you keep the events in sync then? If you get a uevent, and then wait a while before reading sysfs, how do you know that a different uevent didn't happen inbetween? > /config/usb_gadget/g1/functions/uac2.0 # cat c_status > 1 --> capture started > 0 --> capture stopped > /config/usb_gadget/g1/functions/uac2.0 # cat p_status > 1 --> playback started > 0 --> playback stopped > > Signed-off-by: Akash Kumar <quic_akakum@quicinc.com> > --- > .../ABI/testing/configfs-usb-gadget-uac2 | 4 ++ > drivers/usb/gadget/function/f_uac2.c | 47 +++++++++++++++++++ > drivers/usb/gadget/function/u_uac2.h | 5 ++ > 3 files changed, 56 insertions(+) > > diff --git a/Documentation/ABI/testing/configfs-usb-gadget-uac2 b/Documentation/ABI/testing/configfs-usb-gadget-uac2 > index 2bfdd4efa9bd..196c6921a163 100644 > --- a/Documentation/ABI/testing/configfs-usb-gadget-uac2 > +++ b/Documentation/ABI/testing/configfs-usb-gadget-uac2 > @@ -10,3 +10,7 @@ Description: > p_chmask - playback channel mask > p_srate - playback sampling rate > p_ssize - playback sample size (bytes) > + c_status - usb uac2 audio capture state > + (0: capture stopped, 1: capture started) > + p_status - usb uac2 audio playback state > + (0: playback stopped, 1: playback started) > diff --git a/drivers/usb/gadget/function/f_uac2.c b/drivers/usb/gadget/function/f_uac2.c > index db2d4980cb35..f1f7631e9380 100644 > --- a/drivers/usb/gadget/function/f_uac2.c > +++ b/drivers/usb/gadget/function/f_uac2.c > @@ -739,6 +739,8 @@ afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt) > struct usb_gadget *gadget = cdev->gadget; > struct device *dev = &gadget->dev; > int ret = 0; > + struct f_uac2_opts *audio_opts = > + container_of(fn->fi, struct f_uac2_opts, func_inst); > > /* No i/f has more than 2 alt settings */ > if (alt > 1) { > @@ -762,6 +764,8 @@ afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt) > ret = u_audio_start_capture(&uac2->g_audio); > else > u_audio_stop_capture(&uac2->g_audio); > + audio_opts->c_status = alt; > + schedule_work(&audio_opts->work); > } else if (intf == uac2->as_in_intf) { > uac2->as_in_alt = alt; > > @@ -769,6 +773,8 @@ afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt) > ret = u_audio_start_playback(&uac2->g_audio); > else > u_audio_stop_playback(&uac2->g_audio); > + audio_opts->p_status = alt; > + schedule_work(&audio_opts->work); > } else { > dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); > return -EINVAL; > @@ -801,11 +807,16 @@ static void > afunc_disable(struct usb_function *fn) > { > struct f_uac2 *uac2 = func_to_uac2(fn); > + struct f_uac2_opts *audio_opts = > + container_of(fn->fi, struct f_uac2_opts, func_inst); > > uac2->as_in_alt = 0; > uac2->as_out_alt = 0; > + audio_opts->p_status = 0;//alt; > + audio_opts->c_status = 0; //alt; > u_audio_stop_capture(&uac2->g_audio); > u_audio_stop_playback(&uac2->g_audio); > + schedule_work(&audio_opts->work); > } > > static int > @@ -1036,6 +1047,25 @@ UAC2_ATTRIBUTE(c_srate); > UAC2_ATTRIBUTE(c_ssize); > UAC2_ATTRIBUTE(req_number); > > +#define UAC2_ATTRIBUTE_RO(name) \ > + static ssize_t f_uac2_opts_##name##_show( \ > + struct config_item *item, \ > + char *page) \ > +{ \ > + struct f_uac2_opts *opts = to_f_uac2_opts(item); \ > + int result; \ > + \ > + mutex_lock(&opts->lock); \ > + result = scnprintf(page, PAGE_SIZE, "%u\n", opts->name); \ > + mutex_unlock(&opts->lock); \ > + \ > + return result; \ > +} \ > +CONFIGFS_ATTR_RO(f_uac2_opts_, name) > + > +UAC2_ATTRIBUTE_RO(c_status); > +UAC2_ATTRIBUTE_RO(p_status); > + > static struct configfs_attribute *f_uac2_attrs[] = { > &f_uac2_opts_attr_p_chmask, > &f_uac2_opts_attr_p_srate, > @@ -1044,6 +1074,8 @@ static struct configfs_attribute *f_uac2_attrs[] = { > &f_uac2_opts_attr_c_srate, > &f_uac2_opts_attr_c_ssize, > &f_uac2_opts_attr_req_number, > + &f_uac2_opts_attr_c_status, > + &f_uac2_opts_attr_p_status, You didn't document these new attributes either in Documentation/ABI/ Also, what userspace tool is going to use these? thanks, greg k-h
diff --git a/Documentation/ABI/testing/configfs-usb-gadget-uac2 b/Documentation/ABI/testing/configfs-usb-gadget-uac2 index 2bfdd4efa9bd..196c6921a163 100644 --- a/Documentation/ABI/testing/configfs-usb-gadget-uac2 +++ b/Documentation/ABI/testing/configfs-usb-gadget-uac2 @@ -10,3 +10,7 @@ Description: p_chmask - playback channel mask p_srate - playback sampling rate p_ssize - playback sample size (bytes) + c_status - usb uac2 audio capture state + (0: capture stopped, 1: capture started) + p_status - usb uac2 audio playback state + (0: playback stopped, 1: playback started) diff --git a/drivers/usb/gadget/function/f_uac2.c b/drivers/usb/gadget/function/f_uac2.c index db2d4980cb35..f1f7631e9380 100644 --- a/drivers/usb/gadget/function/f_uac2.c +++ b/drivers/usb/gadget/function/f_uac2.c @@ -739,6 +739,8 @@ afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt) struct usb_gadget *gadget = cdev->gadget; struct device *dev = &gadget->dev; int ret = 0; + struct f_uac2_opts *audio_opts = + container_of(fn->fi, struct f_uac2_opts, func_inst); /* No i/f has more than 2 alt settings */ if (alt > 1) { @@ -762,6 +764,8 @@ afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt) ret = u_audio_start_capture(&uac2->g_audio); else u_audio_stop_capture(&uac2->g_audio); + audio_opts->c_status = alt; + schedule_work(&audio_opts->work); } else if (intf == uac2->as_in_intf) { uac2->as_in_alt = alt; @@ -769,6 +773,8 @@ afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt) ret = u_audio_start_playback(&uac2->g_audio); else u_audio_stop_playback(&uac2->g_audio); + audio_opts->p_status = alt; + schedule_work(&audio_opts->work); } else { dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); return -EINVAL; @@ -801,11 +807,16 @@ static void afunc_disable(struct usb_function *fn) { struct f_uac2 *uac2 = func_to_uac2(fn); + struct f_uac2_opts *audio_opts = + container_of(fn->fi, struct f_uac2_opts, func_inst); uac2->as_in_alt = 0; uac2->as_out_alt = 0; + audio_opts->p_status = 0;//alt; + audio_opts->c_status = 0; //alt; u_audio_stop_capture(&uac2->g_audio); u_audio_stop_playback(&uac2->g_audio); + schedule_work(&audio_opts->work); } static int @@ -1036,6 +1047,25 @@ UAC2_ATTRIBUTE(c_srate); UAC2_ATTRIBUTE(c_ssize); UAC2_ATTRIBUTE(req_number); +#define UAC2_ATTRIBUTE_RO(name) \ + static ssize_t f_uac2_opts_##name##_show( \ + struct config_item *item, \ + char *page) \ +{ \ + struct f_uac2_opts *opts = to_f_uac2_opts(item); \ + int result; \ + \ + mutex_lock(&opts->lock); \ + result = scnprintf(page, PAGE_SIZE, "%u\n", opts->name); \ + mutex_unlock(&opts->lock); \ + \ + return result; \ +} \ +CONFIGFS_ATTR_RO(f_uac2_opts_, name) + +UAC2_ATTRIBUTE_RO(c_status); +UAC2_ATTRIBUTE_RO(p_status); + static struct configfs_attribute *f_uac2_attrs[] = { &f_uac2_opts_attr_p_chmask, &f_uac2_opts_attr_p_srate, @@ -1044,6 +1074,8 @@ static struct configfs_attribute *f_uac2_attrs[] = { &f_uac2_opts_attr_c_srate, &f_uac2_opts_attr_c_ssize, &f_uac2_opts_attr_req_number, + &f_uac2_opts_attr_c_status, + &f_uac2_opts_attr_p_status, NULL, }; @@ -1053,11 +1085,23 @@ static const struct config_item_type f_uac2_func_type = { .ct_owner = THIS_MODULE, }; +static void f_uac2_audio_status_change_work(struct work_struct *data) +{ + struct f_uac2_opts *audio_opts = + container_of(data, struct f_uac2_opts, work); + char *envp[2] = { "UAC2_STATE=Changed", NULL }; + + kobject_uevent_env(&audio_opts->device->kobj, + KOBJ_CHANGE, envp); +} + static void afunc_free_inst(struct usb_function_instance *f) { struct f_uac2_opts *opts; opts = container_of(f, struct f_uac2_opts, func_inst); + device_destroy(opts->device->class, opts->device->devt); + cancel_work_sync(&opts->work); kfree(opts); } @@ -1082,6 +1126,9 @@ static struct usb_function_instance *afunc_alloc_inst(void) opts->c_srate = UAC2_DEF_CSRATE; opts->c_ssize = UAC2_DEF_CSSIZE; opts->req_number = UAC2_DEF_REQ_NUM; + INIT_WORK(&opts->work, f_uac2_audio_status_change_work); + opts->device = create_function_device("f_uac2"); + return &opts->func_inst; } diff --git a/drivers/usb/gadget/function/u_uac2.h b/drivers/usb/gadget/function/u_uac2.h index b5035711172d..3ccf2eb002f1 100644 --- a/drivers/usb/gadget/function/u_uac2.h +++ b/drivers/usb/gadget/function/u_uac2.h @@ -36,6 +36,11 @@ struct f_uac2_opts { struct mutex lock; int refcnt; + int c_status; + int p_status; + struct device *device; + struct work_struct work; }; +extern struct device *create_function_device(char *name); #endif
Adding uevent from usb audio gadget driver for uac2 playback/capture events, which userspace reads and later reads sysfs entry to know if playback or capture has stopped or started by host application. /config/usb_gadget/g1/functions/uac2.0 # cat c_status 1 --> capture started 0 --> capture stopped /config/usb_gadget/g1/functions/uac2.0 # cat p_status 1 --> playback started 0 --> playback stopped Signed-off-by: Akash Kumar <quic_akakum@quicinc.com> --- .../ABI/testing/configfs-usb-gadget-uac2 | 4 ++ drivers/usb/gadget/function/f_uac2.c | 47 +++++++++++++++++++ drivers/usb/gadget/function/u_uac2.h | 5 ++ 3 files changed, 56 insertions(+)