* Re: [PATCH] Disconnect hidraw device when an input device is disconnected
2009-07-20 8:13 ` Marcel Holtmann
@ 2009-07-21 12:42 ` Jiri Kosina
0 siblings, 0 replies; 3+ messages in thread
From: Jiri Kosina @ 2009-07-21 12:42 UTC (permalink / raw)
To: Marcel Holtmann; +Cc: Brian Rogers, linux-bluetooth
On Mon, 20 Jul 2009, Marcel Holtmann wrote:
> > hidraw didn't exist when Bluetooth code was adapted to use the HID
> > subsystem. Now that it does exist, hidp is responsible for
> > disconnecting it. Without doing this, old hidraw devices stick around
> > forever.
> >
> > Signed-off-by: Brian Rogers <brian@xyzw.org>
> > ---
> > net/bluetooth/hidp/core.c | 3 +++
> > 1 files changed, 3 insertions(+), 0 deletions(-)
> >
> > diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c
> > index a9f7afb..5def2db 100644
> > --- a/net/bluetooth/hidp/core.c
> > +++ b/net/bluetooth/hidp/core.c
> > @@ -40,6 +40,7 @@
> >
> > #include <linux/input.h>
> > #include <linux/hid.h>
> > +#include <linux/hidraw.h>
> >
> > #include <net/bluetooth/bluetooth.h>
> > #include <net/bluetooth/hci_core.h>
> > @@ -574,6 +575,8 @@ static int hidp_session(void *arg)
> > if (session->hid) {
> > if (session->hid->claimed & HID_CLAIMED_INPUT)
> > hidinput_disconnect(session->hid);
> > + if (session->hid->claimed & HID_CONNECT_HIDRAW)
This should rather be HID_CLAIMED_HIDRAW.
> > + hidraw_disconnect(session->hid);
> > hid_destroy_device(session->hid);
> > }
>
> patch looks good. However I don't understand why the HID core can't do
> that for us. This seems wrong for both cases.
>
> Jiri, why does the HID core register input device and HIDRAW device for
> us, but not disconnect it?
Yes, it indeed seems bogus. How about the patch below instead?
From: Jiri Kosina <jkosina@suse.cz>
Subject: HID: consolidate connect and disconnect into core code
HID core registers input, hidraw and hiddev devices, but leaves
unregistering it up to the individual driver, which is not really nice.
Let's move all the logic to the core.
Reported-by: Marcel Holtmann <marcel@holtmann.org>
Reported-by: Brian Rogers <brian@xyzw.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index f2c21d5..3b776d7 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1218,6 +1218,17 @@ int hid_connect(struct hid_device *hdev, unsigned int connect_mask)
}
EXPORT_SYMBOL_GPL(hid_connect);
+void hid_disconnect(struct hid_device *hdev)
+{
+ if (hdev->claimed & HID_CLAIMED_INPUT)
+ hidinput_disconnect(hdev);
+ if (hdev->claimed & HID_CLAIMED_HIDDEV)
+ hdev->hiddev_disconnect(hdev);
+ if (hdev->claimed & HID_CLAIMED_HIDRAW)
+ hidraw_disconnect(hdev);
+}
+EXPORT_SYMBOL_GPL(hid_disconnect);
+
/* a list of devices for which there is a specialized driver on HID bus */
static const struct hid_device_id hid_blacklist[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_WCP32PU) },
diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index 3c1fcb7..0aa180b 100644
--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -1047,13 +1047,6 @@ static void usbhid_stop(struct hid_device *hid)
hid_cancel_delayed_stuff(usbhid);
- if (hid->claimed & HID_CLAIMED_INPUT)
- hidinput_disconnect(hid);
- if (hid->claimed & HID_CLAIMED_HIDDEV)
- hiddev_disconnect(hid);
- if (hid->claimed & HID_CLAIMED_HIDRAW)
- hidraw_disconnect(hid);
-
hid->claimed = 0;
usb_free_urb(usbhid->urbin);
@@ -1091,7 +1084,7 @@ static struct hid_ll_driver usb_hid_driver = {
.hidinput_input_event = usb_hidinput_input_event,
};
-static int hid_probe(struct usb_interface *intf, const struct usb_device_id *id)
+static int usbhid_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
struct usb_host_interface *interface = intf->cur_altsetting;
struct usb_device *dev = interface_to_usbdev(intf);
@@ -1123,6 +1116,7 @@ static int hid_probe(struct usb_interface *intf, const struct usb_device_id *id)
hid->ff_init = hid_pidff_init;
#ifdef CONFIG_USB_HIDDEV
hid->hiddev_connect = hiddev_connect;
+ hid->hiddev_disconnect = hiddev_disconnect;
hid->hiddev_hid_event = hiddev_hid_event;
hid->hiddev_report_event = hiddev_report_event;
#endif
@@ -1183,7 +1177,7 @@ err:
return ret;
}
-static void hid_disconnect(struct usb_interface *intf)
+static void usbhid_disconnect(struct usb_interface *intf)
{
struct hid_device *hid = usb_get_intfdata(intf);
struct usbhid_device *usbhid;
@@ -1365,8 +1359,8 @@ MODULE_DEVICE_TABLE (usb, hid_usb_ids);
static struct usb_driver hid_driver = {
.name = "usbhid",
- .probe = hid_probe,
- .disconnect = hid_disconnect,
+ .probe = usbhid_probe,
+ .disconnect = usbhid_disconnect,
#ifdef CONFIG_PM
.suspend = hid_suspend,
.resume = hid_resume,
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 53489fd..1c5955d 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -494,6 +494,7 @@ struct hid_device { /* device report descriptor */
/* hiddev event handler */
int (*hiddev_connect)(struct hid_device *, unsigned int);
+ void (*hiddev_disconnect)(struct hid_device *);
void (*hiddev_hid_event) (struct hid_device *, struct hid_field *field,
struct hid_usage *, __s32);
void (*hiddev_report_event) (struct hid_device *, struct hid_report *);
@@ -685,6 +686,7 @@ struct hid_device *hid_allocate_device(void);
int hid_parse_report(struct hid_device *hid, __u8 *start, unsigned size);
int hid_check_keys_pressed(struct hid_device *hid);
int hid_connect(struct hid_device *hid, unsigned int connect_mask);
+void hid_disconnect(struct hid_device *hid);
/**
* hid_map_usage - map usage input bits
@@ -794,6 +796,7 @@ static inline int __must_check hid_hw_start(struct hid_device *hdev,
*/
static inline void hid_hw_stop(struct hid_device *hdev)
{
+ hid_disconnect(hdev);
hdev->ll_driver->stop(hdev);
}
diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c
index b186768..6593574 100644
--- a/net/bluetooth/hidp/core.c
+++ b/net/bluetooth/hidp/core.c
@@ -570,11 +570,8 @@ static int hidp_session(void *arg)
session->input = NULL;
}
- if (session->hid) {
- if (session->hid->claimed & HID_CLAIMED_INPUT)
- hidinput_disconnect(session->hid);
+ if (session->hid)
hid_destroy_device(session->hid);
- }
/* Wakeup user-space polling for socket errors */
session->intr_sock->sk->sk_err = EUNATCH;
@@ -729,8 +726,6 @@ static void hidp_stop(struct hid_device *hid)
skb_queue_purge(&session->ctrl_transmit);
skb_queue_purge(&session->intr_transmit);
- if (hid->claimed & HID_CLAIMED_INPUT)
- hidinput_disconnect(hid);
hid->claimed = 0;
}
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