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Date: Thu, 22 Sep 2016 20:41:09 +0800
From: Baolin Wang <baolin.wang@...aro.org>
To: Greg KH <gregkh@...uxfoundation.org>
Cc: Felipe Balbi <balbi@...nel.org>,
Badhri Jagan Sridharan <Badhri@...gle.com>,
Mark Brown <broonie@...nel.org>,
USB <linux-usb@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] usb: gadget: Add uevent to notify userspace
On 22 September 2016 at 20:23, Greg KH <gregkh@...uxfoundation.org> wrote:
> On Thu, Sep 22, 2016 at 07:43:59PM +0800, Baolin Wang wrote:
>> From: Badhri Jagan Sridharan <Badhri@...gle.com>
>>
>> Some USB managament on userspace (like Android system) rely on the uevents
>> generated by the composition driver to generate user notifications. Thus this
>> patch adds uevents to be generated whenever USB changes its state: connected,
>> disconnected, configured.
>>
>> The original code was created by Badhri Jagan Sridharan, and I did some
>> optimization.
>>
>> Signed-off-by: Badhri Jagan Sridharan <Badhri@...gle.com>
>
> You can't just add someone's signed-off-by to a patch, go read what the
> legal agreement you just made for someone else at a different company
> (hint, you might get a nasty-gram from a google lawyer...)
OK. I will talk with Badhri if I can upstream these.
>
>> Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
>> ---
>> Changes since v1:
>> - Add Badhri's Signed-off-by.
>> ---
>> drivers/usb/gadget/Kconfig | 8 +++
>> drivers/usb/gadget/configfs.c | 107 +++++++++++++++++++++++++++++++++++++++++
>> 2 files changed, 115 insertions(+)
>>
>> diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
>> index 2ea3fc3..9f5d0c6 100644
>> --- a/drivers/usb/gadget/Kconfig
>> +++ b/drivers/usb/gadget/Kconfig
>> @@ -223,6 +223,14 @@ config USB_CONFIGFS
>> appropriate symbolic links.
>> For more information see Documentation/usb/gadget_configfs.txt.
>>
>> +config USB_CONFIGFS_UEVENT
>> + boolean "Uevent notification of Gadget state"
>> + depends on USB_CONFIGFS
>
>
>
>> + help
>> + Enable uevent notifications to userspace when the gadget
>> + state changes. The gadget can be in any of the following
>> + three states: "CONNECTED/DISCONNECTED/CONFIGURED"
>> +
>> config USB_CONFIGFS_SERIAL
>> bool "Generic serial bulk in/out"
>> depends on USB_CONFIGFS
>> diff --git a/drivers/usb/gadget/configfs.c b/drivers/usb/gadget/configfs.c
>> index 3984787..4c2bc27 100644
>> --- a/drivers/usb/gadget/configfs.c
>> +++ b/drivers/usb/gadget/configfs.c
>> @@ -60,6 +60,11 @@ struct gadget_info {
>> bool use_os_desc;
>> char b_vendor_code;
>> char qw_sign[OS_STRING_QW_SIGN_LEN];
>> +#ifdef CONFIG_USB_CONFIGFS_UEVENT
>> + bool connected;
>> + bool sw_connected;
>> + struct work_struct work;
>> +#endif
>> };
>>
>> static inline struct gadget_info *to_gadget_info(struct config_item *item)
>> @@ -1197,6 +1202,57 @@ int composite_dev_prepare(struct usb_composite_driver *composite,
>> int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
>> struct usb_ep *ep0);
>>
>> +#ifdef CONFIG_USB_CONFIGFS_UEVENT
>> +static void configfs_work(struct work_struct *data)
>> +{
>> + struct gadget_info *gi = container_of(data, struct gadget_info, work);
>> + struct usb_composite_dev *cdev = &gi->cdev;
>> + char *disconnected[2] = { "USB_STATE=DISCONNECTED", NULL };
>> + char *connected[2] = { "USB_STATE=CONNECTED", NULL };
>> + char *configured[2] = { "USB_STATE=CONFIGURED", NULL };
>> + /* 0-connected 1-configured 2-disconnected */
>> + bool status[3] = { false, false, false };
>> + unsigned long flags;
>> + bool uevent_sent = false;
>> +
>> + spin_lock_irqsave(&cdev->lock, flags);
>> + if (cdev->config && gi->connected)
>> + status[1] = true;
>> +
>> + if (gi->connected != gi->sw_connected) {
>> + if (gi->connected)
>> + status[0] = true;
>> + else
>> + status[2] = true;
>> + gi->sw_connected = gi->connected;
>> + }
>> + spin_unlock_irqrestore(&cdev->lock, flags);
>> +
>> + if (status[0]) {
>> + kobject_uevent_env(&gi->dev->kobj, KOBJ_CHANGE, connected);
>> + pr_info("%s: sent uevent %s\n", __func__, connected[0]);
>
> You are kidding, right?
>
>> + uevent_sent = true;
>> + }
>> +
>> + if (status[1]) {
>> + kobject_uevent_env(&gi->dev->kobj, KOBJ_CHANGE, configured);
>> + pr_info("%s: sent uevent %s\n", __func__, configured[0]);
>
> Come on, please...
>
>> + uevent_sent = true;
>> + }
>> +
>> + if (status[2]) {
>> + kobject_uevent_env(&gi->dev->kobj, KOBJ_CHANGE, disconnected);
>> + pr_info("%s: sent uevent %s\n", __func__, disconnected[0]);
>
> This is getting funny...
>
>> + uevent_sent = true;
>> + }
>> +
>> + if (!uevent_sent) {
>> + pr_info("%s: did not send uevent (%d %d %p)\n", __func__,
>> + gi->connected, gi->sw_connected, cdev->config);
>
> Nope, not funny anymore.
>
>> + }
>> +}
>> +#endif
>> +
>> static void purge_configs_funcs(struct gadget_info *gi)
>> {
>> struct usb_configuration *c;
>> @@ -1386,13 +1442,60 @@ static void configfs_composite_unbind(struct usb_gadget *gadget)
>> set_gadget_data(gadget, NULL);
>> }
>>
>> +#ifdef CONFIG_USB_CONFIGFS_UEVENT
>> +static int configfs_setup(struct usb_gadget *gadget,
>> + const struct usb_ctrlrequest *c)
>> +{
>> + struct usb_composite_dev *cdev = get_gadget_data(gadget);
>> + struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
>> + int value = -EOPNOTSUPP;
>> + unsigned long flags;
>> +
>> + spin_lock_irqsave(&cdev->lock, flags);
>> + if (!gi->connected) {
>> + gi->connected = 1;
>> + schedule_work(&gi->work);
>> + }
>> + spin_unlock_irqrestore(&cdev->lock, flags);
>> +
>> + value = composite_setup(gadget, c);
>> +
>> + spin_lock_irqsave(&cdev->lock, flags);
>> + if (c->bRequest == USB_REQ_SET_CONFIGURATION && cdev->config)
>> + schedule_work(&gi->work);
>> + spin_unlock_irqrestore(&cdev->lock, flags);
>> +
>> + return value;
>> +}
>> +
>> +static void configfs_disconnect(struct usb_gadget *gadget)
>> +{
>> + struct usb_composite_dev *cdev = get_gadget_data(gadget);
>> + struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
>> + unsigned long flags;
>> +
>> + spin_lock_irqsave(&cdev->lock, flags);
>> + gi->connected = 0;
>> + schedule_work(&gi->work);
>> + spin_unlock_irqrestore(&cdev->lock, flags);
>> +
>> + composite_disconnect(gadget);
>> +}
>> +#endif
>> +
>> static const struct usb_gadget_driver configfs_driver_template = {
>> .bind = configfs_composite_bind,
>> .unbind = configfs_composite_unbind,
>>
>> +#ifdef CONFIG_USB_CONFIGFS_UEVENT
>> + .setup = configfs_setup,
>> + .reset = configfs_disconnect,
>> + .disconnect = configfs_disconnect,
>> +#else
>> .setup = composite_setup,
>> .reset = composite_disconnect,
>> .disconnect = composite_disconnect,
>> +#endif
>>
>> .suspend = composite_suspend,
>> .resume = composite_resume,
>> @@ -1453,6 +1556,10 @@ static struct config_group *gadgets_make(
>> gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
>> gi->composite.name = gi->composite.gadget_driver.function;
>>
>> +#ifdef CONFIG_USB_CONFIGFS_UEVENT
>> + INIT_WORK(&gi->work, configfs_work);
>> +#endif
>
> This is just way too ugly, please make it so there are no #ifdefs in the
> .c files.
>
> Or, as others said, why is this a build option at all, why would you not
> always want this enabled if you are relying on it all of the time?
Sometimes userspace does not need the notification, it is not all the
time. Anyway I will remove the macro if you still insist on that.
--
Baolin.wang
Best Regards
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