From stern@rowland.harvard.edu Tue May 10 12:37:00 2005 Date: Tue, 10 May 2005 15:34:16 -0400 (EDT) From: Alan Stern To: Greg KH Subject: [PATCH as525] USB: dummy_hcd: add suspend/resume support Message-ID: This patch adds support to dummy_hcd for suspending and resuming the root hub and the emulated platform devices. Signed-off-by: Alan Stern Signed-off-by: Greg Kroah-Hartman --- drivers/usb/gadget/dummy_hcd.c | 179 +++++++++++++++++++++++++++++++++++++---- 1 files changed, 162 insertions(+), 17 deletions(-) --- gregkh-2.6.orig/drivers/usb/gadget/dummy_hcd.c 2005-05-13 14:22:39.000000000 -0700 +++ gregkh-2.6/drivers/usb/gadget/dummy_hcd.c 2005-05-13 14:23:23.000000000 -0700 @@ -65,7 +65,7 @@ #define DRIVER_DESC "USB Host+Gadget Emulator" -#define DRIVER_VERSION "17 Dec 2004" +#define DRIVER_VERSION "02 May 2005" static const char driver_name [] = "dummy_hcd"; static const char driver_desc [] = "USB Host+Gadget Emulator"; @@ -150,6 +150,13 @@ struct list_head urbp_list; }; + +enum dummy_rh_state { + DUMMY_RH_RESET, + DUMMY_RH_SUSPENDED, + DUMMY_RH_RUNNING +}; + struct dummy { spinlock_t lock; @@ -163,6 +170,7 @@ struct dummy_request fifo_req; u8 fifo_buf [FIFO_SIZE]; u16 devstatus; + unsigned udc_suspended:1; unsigned pullup:1; unsigned active:1; unsigned old_active:1; @@ -170,6 +178,7 @@ /* * MASTER/HOST side support */ + enum dummy_rh_state rh_state; struct timer_list timer; u32 port_status; u32 old_status; @@ -262,7 +271,9 @@ dum->active = 0; if ((dum->port_status & USB_PORT_STAT_POWER) == 0) dum->port_status = 0; - else if (!dum->pullup) { + + /* UDC suspend must cause a disconnect */ + else if (!dum->pullup || dum->udc_suspended) { dum->port_status &= ~(USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | USB_PORT_STAT_LOW_SPEED | @@ -276,7 +287,8 @@ dum->port_status |= (USB_PORT_STAT_C_CONNECTION << 16); if ((dum->port_status & USB_PORT_STAT_ENABLE) == 0) dum->port_status &= ~USB_PORT_STAT_SUSPEND; - else if ((dum->port_status & USB_PORT_STAT_SUSPEND) == 0) + else if ((dum->port_status & USB_PORT_STAT_SUSPEND) == 0 && + dum->rh_state != DUMMY_RH_SUSPENDED) dum->active = 1; } @@ -675,11 +687,16 @@ struct dummy *dum; dum = gadget_to_dummy (_gadget); - if (!(dum->port_status & USB_PORT_STAT_SUSPEND) - || !(dum->devstatus & - ( (1 << USB_DEVICE_B_HNP_ENABLE) + if (!(dum->devstatus & ( (1 << USB_DEVICE_B_HNP_ENABLE) | (1 << USB_DEVICE_REMOTE_WAKEUP)))) return -EINVAL; + if ((dum->port_status & USB_PORT_STAT_CONNECTION) == 0) + return -ENOLINK; + if ((dum->port_status & USB_PORT_STAT_SUSPEND) == 0 && + dum->rh_state != DUMMY_RH_SUSPENDED) + return -EIO; + + /* FIXME: What if the root hub is suspended but the port isn't? */ /* hub notices our request, issues downstream resume, etc */ dum->resuming = 1; @@ -917,11 +934,50 @@ return 0; } +static int dummy_udc_suspend (struct device *dev, pm_message_t state, + u32 level) +{ + struct dummy *dum = dev_get_drvdata(dev); + + if (level != SUSPEND_DISABLE) + return 0; + + dev_dbg (dev, "%s\n", __FUNCTION__); + spin_lock_irq (&dum->lock); + dum->udc_suspended = 1; + set_link_state (dum); + spin_unlock_irq (&dum->lock); + + dev->power.power_state = state; + usb_hcd_poll_rh_status (dummy_to_hcd (dum)); + return 0; +} + +static int dummy_udc_resume (struct device *dev, u32 level) +{ + struct dummy *dum = dev_get_drvdata(dev); + + if (level != RESUME_ENABLE) + return 0; + + dev_dbg (dev, "%s\n", __FUNCTION__); + spin_lock_irq (&dum->lock); + dum->udc_suspended = 0; + set_link_state (dum); + spin_unlock_irq (&dum->lock); + + dev->power.power_state = PMSG_ON; + usb_hcd_poll_rh_status (dummy_to_hcd (dum)); + return 0; +} + static struct device_driver dummy_udc_driver = { .name = (char *) gadget_name, .bus = &platform_bus_type, .probe = dummy_udc_probe, .remove = dummy_udc_remove, + .suspend = dummy_udc_suspend, + .resume = dummy_udc_resume, }; /*-------------------------------------------------------------------------*/ @@ -980,7 +1036,16 @@ static int dummy_urb_dequeue (struct usb_hcd *hcd, struct urb *urb) { - /* giveback happens automatically in timer callback */ + struct dummy *dum; + unsigned long flags; + + /* giveback happens automatically in timer callback, + * so make sure the callback happens */ + dum = hcd_to_dummy (hcd); + spin_lock_irqsave (&dum->lock, flags); + if (dum->rh_state != DUMMY_RH_RUNNING && !list_empty(&dum->urbp_list)) + mod_timer (&dum->timer, jiffies); + spin_unlock_irqrestore (&dum->lock, flags); return 0; } @@ -1222,7 +1287,8 @@ if (urb->status != -EINPROGRESS) { /* likely it was just unlinked */ goto return_urb; - } + } else if (dum->rh_state != DUMMY_RH_RUNNING) + continue; type = usb_pipetype (urb->pipe); /* used up this frame's non-periodic bandwidth? @@ -1486,12 +1552,12 @@ goto restart; } - /* want a 1 msec delay here */ - if (!list_empty (&dum->urbp_list)) - mod_timer (&dum->timer, jiffies + msecs_to_jiffies(1)); - else { + if (list_empty (&dum->urbp_list)) { usb_put_dev (dum->udev); dum->udev = NULL; + } else if (dum->rh_state == DUMMY_RH_RUNNING) { + /* want a 1 msec delay here */ + mod_timer (&dum->timer, jiffies + msecs_to_jiffies(1)); } spin_unlock_irqrestore (&dum->lock, flags); @@ -1510,11 +1576,13 @@ { struct dummy *dum; unsigned long flags; - int retval; + int retval = 0; dum = hcd_to_dummy (hcd); spin_lock_irqsave (&dum->lock, flags); + if (hcd->state != HC_STATE_RUNNING) + goto done; if (dum->resuming && time_after_eq (jiffies, dum->re_timeout)) { dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16); @@ -1522,14 +1590,15 @@ set_link_state (dum); } - if (!(dum->port_status & PORT_C_MASK)) - retval = 0; - else { + if ((dum->port_status & PORT_C_MASK) != 0) { *buf = (1 << 1); dev_dbg (dummy_dev(dum), "port status 0x%08x has changes\n", - dum->port_status); + dum->port_status); retval = 1; + if (dum->rh_state == DUMMY_RH_SUSPENDED) + usb_hcd_resume_root_hub (hcd); } +done: spin_unlock_irqrestore (&dum->lock, flags); return retval; } @@ -1559,6 +1628,9 @@ int retval = 0; unsigned long flags; + if (hcd->state != HC_STATE_RUNNING) + return -ETIMEDOUT; + dum = hcd_to_dummy (hcd); spin_lock_irqsave (&dum->lock, flags); switch (typeReq) { @@ -1658,6 +1730,7 @@ dum->port_status &= ~(USB_PORT_STAT_ENABLE | USB_PORT_STAT_LOW_SPEED | USB_PORT_STAT_HIGH_SPEED); + dum->devstatus = 0; /* 50msec reset signaling */ dum->re_timeout = jiffies + msecs_to_jiffies(50); /* FALLS THROUGH */ @@ -1684,6 +1757,29 @@ return retval; } +static int dummy_hub_suspend (struct usb_hcd *hcd) +{ + struct dummy *dum = hcd_to_dummy (hcd); + + spin_lock_irq (&dum->lock); + dum->rh_state = DUMMY_RH_SUSPENDED; + set_link_state (dum); + spin_unlock_irq (&dum->lock); + return 0; +} + +static int dummy_hub_resume (struct usb_hcd *hcd) +{ + struct dummy *dum = hcd_to_dummy (hcd); + + spin_lock_irq (&dum->lock); + dum->rh_state = DUMMY_RH_RUNNING; + set_link_state (dum); + if (!list_empty(&dum->urbp_list)) + mod_timer (&dum->timer, jiffies); + spin_unlock_irq (&dum->lock); + return 0; +} /*-------------------------------------------------------------------------*/ @@ -1751,6 +1847,7 @@ init_timer (&dum->timer); dum->timer.function = dummy_timer; dum->timer.data = (unsigned long) dum; + dum->rh_state = DUMMY_RH_RUNNING; INIT_LIST_HEAD (&dum->urbp_list); @@ -1803,6 +1900,8 @@ .hub_status_data = dummy_hub_status, .hub_control = dummy_hub_control, + .hub_suspend = dummy_hub_suspend, + .hub_resume = dummy_hub_resume, }; static int dummy_hcd_probe (struct device *dev) @@ -1836,11 +1935,57 @@ return 0; } +static int dummy_hcd_suspend (struct device *dev, pm_message_t state, + u32 level) +{ + struct usb_hcd *hcd; + + if (level != SUSPEND_DISABLE) + return 0; + + dev_dbg (dev, "%s\n", __FUNCTION__); + hcd = dev_get_drvdata (dev); + +#ifndef CONFIG_USB_SUSPEND + /* Otherwise this would never happen */ + usb_lock_device (hcd->self.root_hub); + dummy_hub_suspend (hcd); + usb_unlock_device (hcd->self.root_hub); +#endif + + hcd->state = HC_STATE_SUSPENDED; + return 0; +} + +static int dummy_hcd_resume (struct device *dev, u32 level) +{ + struct usb_hcd *hcd; + + if (level != RESUME_ENABLE) + return 0; + + dev_dbg (dev, "%s\n", __FUNCTION__); + hcd = dev_get_drvdata (dev); + hcd->state = HC_STATE_RUNNING; + +#ifndef CONFIG_USB_SUSPEND + /* Otherwise this would never happen */ + usb_lock_device (hcd->self.root_hub); + dummy_hub_resume (hcd); + usb_unlock_device (hcd->self.root_hub); +#endif + + usb_hcd_poll_rh_status (hcd); + return 0; +} + static struct device_driver dummy_hcd_driver = { .name = (char *) driver_name, .bus = &platform_bus_type, .probe = dummy_hcd_probe, .remove = dummy_hcd_remove, + .suspend = dummy_hcd_suspend, + .resume = dummy_hcd_resume, }; /*-------------------------------------------------------------------------*/