1 From 7eef82d231578140c6000d04846a48bdaf341a65 Mon Sep 17 00:00:00 2001
2 From: David Brownell <dbrownell-Rn4VEauK+AKRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
3 Date: Tue, 24 Mar 2009 17:23:19 -0700
4 Subject: [PATCH] USB: gadget: composite device-level suspend/resume hooks
6 Address one open question in the composite gadget framework:
7 Yes, we should have device-level suspend/resume callbacks
8 in addition to the function-level ones. We have at least one
9 scenario (with gadget zero in OTG test mode) that's awkward
12 Signed-off-by: David Brownell <dbrownell-Rn4VEauK+AKRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
13 Cc: Felipe Balbi <felipe.balbi-xNZwKgViW5gAvxtiuMwx3w@public.gmane.org>
14 Signed-off-by: Greg Kroah-Hartman <gregkh-l3A5Bk7waGM@public.gmane.org>
16 drivers/usb/gadget/composite.c | 8 ++++++--
17 include/linux/usb/composite.h | 8 ++++++++
18 2 files changed, 14 insertions(+), 2 deletions(-)
20 diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
21 index 40f1da7..59e8523 100644
22 --- a/drivers/usb/gadget/composite.c
23 +++ b/drivers/usb/gadget/composite.c
24 @@ -1014,7 +1014,7 @@ composite_suspend(struct usb_gadget *gadget)
25 struct usb_composite_dev *cdev = get_gadget_data(gadget);
26 struct usb_function *f;
28 - /* REVISIT: should we have config and device level
29 + /* REVISIT: should we have config level
30 * suspend/resume callbacks?
32 DBG(cdev, "suspend\n");
33 @@ -1024,6 +1024,8 @@ composite_suspend(struct usb_gadget *gadget)
37 + if (composite->suspend)
38 + composite->suspend(cdev);
42 @@ -1032,10 +1034,12 @@ composite_resume(struct usb_gadget *gadget)
43 struct usb_composite_dev *cdev = get_gadget_data(gadget);
44 struct usb_function *f;
46 - /* REVISIT: should we have config and device level
47 + /* REVISIT: should we have config level
48 * suspend/resume callbacks?
50 DBG(cdev, "resume\n");
51 + if (composite->resume)
52 + composite->resume(cdev);
54 list_for_each_entry(f, &cdev->config->functions, list) {
56 diff --git a/include/linux/usb/composite.h b/include/linux/usb/composite.h
57 index 935c380..acd7b0f 100644
58 --- a/include/linux/usb/composite.h
59 +++ b/include/linux/usb/composite.h
60 @@ -244,6 +244,10 @@ int usb_add_config(struct usb_composite_dev *,
61 * value; it should return zero on successful initialization.
62 * @unbind: Reverses @bind(); called as a side effect of unregistering
64 + * @suspend: Notifies when the host stops sending USB traffic,
65 + * after function notifications
66 + * @resume: Notifies configuration when the host restarts USB traffic,
67 + * before function notifications
69 * Devices default to reporting self powered operation. Devices which rely
70 * on bus powered operation should report this in their @bind() method.
71 @@ -268,6 +272,10 @@ struct usb_composite_driver {
73 int (*bind)(struct usb_composite_dev *);
74 int (*unbind)(struct usb_composite_dev *);
76 + /* global suspend hooks */
77 + void (*suspend)(struct usb_composite_dev *);
78 + void (*resume)(struct usb_composite_dev *);
81 extern int usb_composite_register(struct usb_composite_driver *);