From ce2596df79ddbac605a290f4c7cf011cb40524fc Mon Sep 17 00:00:00 2001 From: Alan Stern Date: Sun, 23 Oct 2005 19:41:39 -0700 Subject: [PATCH] PATCH: usb-storage: implement minimal PM This patch from Alan Stern started as as568. It has been rediffed against a current tree. This patch adds minimal suspend/resume support to usb-storage. Just enough for it to qualify as PM-aware. Signed-off-by: Alan Stern Signed-off-by: Matthew Dharm Signed-off-by: Greg Kroah-Hartman --- drivers/usb/storage/usb.c | 58 +++++++++++++++++++++++++++++++++++++---------- 1 file changed, 46 insertions(+), 12 deletions(-) diff --git a/drivers/usb/storage/usb.c b/drivers/usb/storage/usb.c index eb901817b7d2..c1a902691bc6 100644 --- a/drivers/usb/storage/usb.c +++ b/drivers/usb/storage/usb.c @@ -111,11 +111,6 @@ static atomic_t total_threads = ATOMIC_INIT(0); static DECLARE_COMPLETION(threads_gone); -static int storage_probe(struct usb_interface *iface, - const struct usb_device_id *id); - -static void storage_disconnect(struct usb_interface *iface); - /* The entries in this table, except for final ones here * (USB_MASS_STORAGE_CLASS and the empty entry), correspond, * line for line with the entries of us_unsuaul_dev_list[]. @@ -233,13 +228,40 @@ static struct us_unusual_dev us_unusual_dev_list[] = { { NULL } }; -static struct usb_driver usb_storage_driver = { - .owner = THIS_MODULE, - .name = "usb-storage", - .probe = storage_probe, - .disconnect = storage_disconnect, - .id_table = storage_usb_ids, -}; + +#ifdef CONFIG_PM /* Minimal support for suspend and resume */ + +static int storage_suspend(struct usb_interface *iface, pm_message_t message) +{ + struct us_data *us = usb_get_intfdata(iface); + + /* Wait until no command is running */ + down(&us->dev_semaphore); + + US_DEBUGP("%s\n", __FUNCTION__); + iface->dev.power.power_state.event = message.event; + + /* When runtime PM is working, we'll set a flag to indicate + * whether we should autoresume when a SCSI request arrives. */ + + up(&us->dev_semaphore); + return 0; +} + +static int storage_resume(struct usb_interface *iface) +{ + struct us_data *us = usb_get_intfdata(iface); + + down(&us->dev_semaphore); + + US_DEBUGP("%s\n", __FUNCTION__); + iface->dev.power.power_state.event = PM_EVENT_ON; + + up(&us->dev_semaphore); + return 0; +} + +#endif /* CONFIG_PM */ /* * fill_inquiry_response takes an unsigned char array (which must @@ -1042,6 +1064,18 @@ static void storage_disconnect(struct usb_interface *intf) * Initialization and registration ***********************************************************************/ +static struct usb_driver usb_storage_driver = { + .owner = THIS_MODULE, + .name = "usb-storage", + .probe = storage_probe, + .disconnect = storage_disconnect, +#ifdef CONFIG_PM + .suspend = storage_suspend, + .resume = storage_resume, +#endif + .id_table = storage_usb_ids, +}; + static int __init usb_stor_init(void) { int retval; -- cgit v1.2.3