On Mon, 2008-10-27 at 02:42 -0700, Oliver Neukum wrote:
> Hi,
>
> this is the mergeable version as far as I am concerned. The problems
> I had last week were caused by another issue in the USB stack fixed
> in rc2.
>
> This uses the USB busy mechanism for aggessive autosuspend of USB
> HID devices. It autosuspends all opened devices supporting remote wakeup
> after a timeout unless
>
> - output is being done to the device
> - a key is being held down (remote wakeup isn't triggered upon key release)
> - LED(s) are lit
> - hiddev is opened
>
> As in the current driver closed devices will be autosuspended even if they
> don't support remote wakeup.
>
> The patch is quite large because output to devices is done in hard interrupt
> context meaning a lot a queuing and locking had to be touched. The LED stuff
> has been solved by means of a simple counter. Additions to the generic HID code
> could be avoided.
>
> The patch is against 2.6.28-rc2diff
You can use scripts/checkpatch.pl to check if your patch follows coding
style, use tab instead of 8 white spaces.
>
> Regards
> Oliver
>
> Signed-off-by: Oliver Neukum <oneukum@xxxxxxx>
>
> ---
>
> --- a/drivers/hid/hid-core.c
> +++ b/drivers/hid/hid-core.c
> @@ -1674,6 +1674,22 @@ static DECLARE_WORK(hid_compat_work, hid_compat_load);
> static struct workqueue_struct *hid_compat_wq;
> #endif
>
> +int hid_check_keys_pressed(struct hid_device *hid)
> +{
> + struct hid_input *hidinput;
> + int i;
> +
> + list_for_each_entry(hidinput, &hid->inputs, list) {
> + for (i = 0; i < BITS_TO_LONGS(KEY_MAX); i++)
> + if (hidinput->input->key[i])
> + return 1;
> + }
> +
> + return 0;
> +}
> +
> +EXPORT_SYMBOL_GPL(hid_check_keys_pressed);
> +
> static int __init hid_init(void)
> {
> int ret;
> --- a/drivers/hid/usbhid/hid-core.c
> +++ b/drivers/hid/usbhid/hid-core.c
> @@ -5,6 +5,7 @@
> * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@xxxxxxx>
> * Copyright (c) 2005 Michael Haboustak <mike-@xxxxxxxxxxxx> for Concept2, Inc
> * Copyright (c) 2006-2007 Jiri Kosina
> + * Copyright (c) 2007-2008 Oliver Neukum
> */
>
> /*
> @@ -26,6 +27,7 @@
> #include <asm/byteorder.h>
> #include <linux/input.h>
> #include <linux/wait.h>
> +#include <linux/workqueue.h>
>
> #include <linux/usb.h>
>
> @@ -52,6 +54,10 @@ static unsigned int hid_mousepoll_interval;
> module_param_named(mousepoll, hid_mousepoll_interval, uint, 0644);
> MODULE_PARM_DESC(mousepoll, "Polling interval of mice");
>
> +static unsigned int ignoreled;
> +module_param_named(ignoreled, ignoreled, uint, 0644);
> +MODULE_PARM_DESC(ignoreled, "Autosuspend with active leds");
> +
> /* Quirks specified at module load time */
> static char *quirks_param[MAX_USBHID_BOOT_QUIRKS] = { [ 0 ... (MAX_USBHID_BOOT_QUIRKS - 1) ] = NULL };
> module_param_array_named(quirks, quirks_param, charp, NULL, 0444);
> @@ -62,8 +68,12 @@ MODULE_PARM_DESC(quirks, "Add/modify USB HID quirks by specifying "
> /*
> * Input submission and I/O error handler.
> */
> +static DEFINE_MUTEX(hid_open_mut);
> +static struct workqueue_struct *resumption_waker;
>
> static void hid_io_error(struct hid_device *hid);
> +static int hid_submit_out(struct hid_device *hid);
> +static int hid_submit_ctrl(struct hid_device *hid);
>
> /* Start up the input URB */
> static int hid_start_in(struct hid_device *hid)
> @@ -72,15 +82,16 @@ static int hid_start_in(struct hid_device *hid)
> int rc = 0;
> struct usbhid_device *usbhid = hid->driver_data;
>
> - spin_lock_irqsave(&usbhid->inlock, flags);
> - if (hid->open > 0 && !test_bit(HID_SUSPENDED, &usbhid->iofl) &&
> + spin_lock_irqsave(&usbhid->lock, flags);
> + if (hid->open > 0 &&
> !test_bit(HID_DISCONNECTED, &usbhid->iofl) &&
> + !test_bit(HID_REPORTED_IDLE, &usbhid->iofl) &&
> !test_and_set_bit(HID_IN_RUNNING, &usbhid->iofl)) {
> rc = usb_submit_urb(usbhid->urbin, GFP_ATOMIC);
> if (rc != 0)
> clear_bit(HID_IN_RUNNING, &usbhid->iofl);
> }
> - spin_unlock_irqrestore(&usbhid->inlock, flags);
> + spin_unlock_irqrestore(&usbhid->lock, flags);
> return rc;
> }
>
> @@ -145,7 +156,7 @@ static void hid_io_error(struct hid_device *hid)
> unsigned long flags;
> struct usbhid_device *usbhid = hid->driver_data;
>
> - spin_lock_irqsave(&usbhid->inlock, flags);
> + spin_lock_irqsave(&usbhid->lock, flags);
>
> /* Stop when disconnected */
> if (test_bit(HID_DISCONNECTED, &usbhid->iofl))
> @@ -175,7 +186,51 @@ static void hid_io_error(struct hid_device *hid)
> mod_timer(&usbhid->io_retry,
> jiffies + msecs_to_jiffies(usbhid->retry_delay));
> done:
> - spin_unlock_irqrestore(&usbhid->inlock, flags);
> + spin_unlock_irqrestore(&usbhid->lock, flags);
> +}
> +
> +static void usbhid_mark_busy(struct usbhid_device *usbhid)
> +{
> + struct usb_interface *intf = usbhid->intf;
> +
> + usb_mark_last_busy(interface_to_usbdev(intf));
> +}
> +
> +static int usbhid_restart_out_queue(struct usbhid_device *usbhid)
> +{
> + struct hid_device *hid = usb_get_intfdata(usbhid->intf);
> + int kicked;
> +
> + if (!hid)
> + return 0;
> +
> + if ((kicked = (usbhid->outhead != usbhid->outtail))) {
> + dbg("Kicking head %d tail %d", usbhid->outhead, usbhid->outtail);
> + if (hid_submit_out(hid)) {
> + clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
> + wake_up(&usbhid->wait);
> + }
> + }
> + return kicked;
> +}
> +
> +static int usbhid_restart_ctrl_queue(struct usbhid_device *usbhid)
> +{
> + struct hid_device *hid = usb_get_intfdata(usbhid->intf);
> + int kicked;
> +
> + WARN_ON(hid == NULL);
> + if (!hid)
> + return 0;
> +
> + if ((kicked = (usbhid->ctrlhead != usbhid->ctrltail))) {
> + dbg("Kicking head %d tail %d", usbhid->ctrlhead, usbhid->ctrltail);
> + if (hid_submit_ctrl(hid)) {
> + clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
> + wake_up(&usbhid->wait);
> + }
> + }
> + return kicked;
> }
>
> /*
> @@ -190,12 +245,19 @@ static void hid_irq_in(struct urb *urb)
>
> switch (urb->status) {
> case 0: /* success */
> + usbhid_mark_busy(usbhid);
> usbhid->retry_delay = 0;
> hid_input_report(urb->context, HID_INPUT_REPORT,
> urb->transfer_buffer,
> urb->actual_length, 1);
> + /* autosuspend refused while keys are pressed*/
> + if (hid_check_keys_pressed(hid))
> + set_bit(HID_KEYS_PRESSED, &usbhid->iofl);
> + else
> + clear_bit(HID_KEYS_PRESSED, &usbhid->iofl);
> break;
> case -EPIPE: /* stall */
> + usbhid_mark_busy(usbhid);
> clear_bit(HID_IN_RUNNING, &usbhid->iofl);
> set_bit(HID_CLEAR_HALT, &usbhid->iofl);
> schedule_work(&usbhid->reset_work);
> @@ -209,6 +271,7 @@ static void hid_irq_in(struct urb *urb)
> case -EPROTO: /* protocol error or unplug */
> case -ETIME: /* protocol error or unplug */
> case -ETIMEDOUT: /* Should never happen, but... */
> + usbhid_mark_busy(usbhid);
> clear_bit(HID_IN_RUNNING, &usbhid->iofl);
> hid_io_error(hid);
> return;
> @@ -239,16 +302,25 @@ static int hid_submit_out(struct hid_device *hid)
> report = usbhid->out[usbhid->outtail].report;
> raw_report = usbhid->out[usbhid->outtail].raw_report;
>
> - usbhid->urbout->transfer_buffer_length = ((report->size - 1) >> 3) + 1 + (report->id > 0);
> - usbhid->urbout->dev = hid_to_usb_dev(hid);
> - memcpy(usbhid->outbuf, raw_report, usbhid->urbout->transfer_buffer_length);
> - kfree(raw_report);
> + if (!test_bit(HID_REPORTED_IDLE, &usbhid->iofl)) {
> + usbhid->urbout->transfer_buffer_length = ((report->size - 1) >> 3) + 1 + (report->id > 0);
> + usbhid->urbout->dev = hid_to_usb_dev(hid);
> + memcpy(usbhid->outbuf, raw_report, usbhid->urbout->transfer_buffer_length);
> + kfree(raw_report);
>
> - dbg_hid("submitting out urb\n");
> + dbg_hid("submitting out urb\n");
>
> - if (usb_submit_urb(usbhid->urbout, GFP_ATOMIC)) {
> - err_hid("usb_submit_urb(out) failed");
> - return -1;
> + if (usb_submit_urb(usbhid->urbout, GFP_ATOMIC)) {
> + err_hid("usb_submit_urb(out) failed");
> + return -1;
> + }
> + } else {
> + /*
> + * queue work to wake up the device.
> + * as the work queue is freezeable, this is safe
> + * with respect to STD and STR
> + */
> + queue_work(resumption_waker, &usbhid->restart_work);
> }
>
> return 0;
> @@ -266,41 +338,50 @@ static int hid_submit_ctrl(struct hid_device *hid)
> raw_report = usbhid->ctrl[usbhid->ctrltail].raw_report;
> dir = usbhid->ctrl[usbhid->ctrltail].dir;
>
> - len = ((report->size - 1) >> 3) + 1 + (report->id > 0);
> - if (dir == USB_DIR_OUT) {
> - usbhid->urbctrl->pipe = usb_sndctrlpipe(hid_to_usb_dev(hid), 0);
> - usbhid->urbctrl->transfer_buffer_length = len;
> - memcpy(usbhid->ctrlbuf, raw_report, len);
> - kfree(raw_report);
> - } else {
> - int maxpacket, padlen;
> -
> - usbhid->urbctrl->pipe = usb_rcvctrlpipe(hid_to_usb_dev(hid), 0);
> - maxpacket = usb_maxpacket(hid_to_usb_dev(hid), usbhid->urbctrl->pipe, 0);
> - if (maxpacket > 0) {
> - padlen = DIV_ROUND_UP(len, maxpacket);
> - padlen *= maxpacket;
> - if (padlen > usbhid->bufsize)
> - padlen = usbhid->bufsize;
> - } else
> - padlen = 0;
> - usbhid->urbctrl->transfer_buffer_length = padlen;
> - }
> - usbhid->urbctrl->dev = hid_to_usb_dev(hid);
> + if (!test_bit(HID_REPORTED_IDLE, &usbhid->iofl)) {
> + len = ((report->size - 1) >> 3) + 1 + (report->id > 0);
> + if (dir == USB_DIR_OUT) {
> + usbhid->urbctrl->pipe = usb_sndctrlpipe(hid_to_usb_dev(hid), 0);
> + usbhid->urbctrl->transfer_buffer_length = len;
> + memcpy(usbhid->ctrlbuf, raw_report, len);
> + kfree(raw_report);
> + } else {
> + int maxpacket, padlen;
> +
> + usbhid->urbctrl->pipe = usb_rcvctrlpipe(hid_to_usb_dev(hid), 0);
> + maxpacket = usb_maxpacket(hid_to_usb_dev(hid), usbhid->urbctrl->pipe, 0);
> + if (maxpacket > 0) {
> + padlen = DIV_ROUND_UP(len, maxpacket);
> + padlen *= maxpacket;
> + if (padlen > usbhid->bufsize)
> + padlen = usbhid->bufsize;
> + } else
> + padlen = 0;
> + usbhid->urbctrl->transfer_buffer_length = padlen;
> + }
> + usbhid->urbctrl->dev = hid_to_usb_dev(hid);
>
> - usbhid->cr->bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE | dir;
> - usbhid->cr->bRequest = (dir == USB_DIR_OUT) ? HID_REQ_SET_REPORT : HID_REQ_GET_REPORT;
> - usbhid->cr->wValue = cpu_to_le16(((report->type + 1) << 8) | report->id);
> - usbhid->cr->wIndex = cpu_to_le16(usbhid->ifnum);
> - usbhid->cr->wLength = cpu_to_le16(len);
> + usbhid->cr->bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE | dir;
> + usbhid->cr->bRequest = (dir == USB_DIR_OUT) ? HID_REQ_SET_REPORT : HID_REQ_GET_REPORT;
> + usbhid->cr->wValue = cpu_to_le16(((report->type + 1) << 8) | report->id);
> + usbhid->cr->wIndex = cpu_to_le16(usbhid->ifnum);
> + usbhid->cr->wLength = cpu_to_le16(len);
>
> - dbg_hid("submitting ctrl urb: %s wValue=0x%04x wIndex=0x%04x wLength=%u\n",
> - usbhid->cr->bRequest == HID_REQ_SET_REPORT ? "Set_Report" : "Get_Report",
> - usbhid->cr->wValue, usbhid->cr->wIndex, usbhid->cr->wLength);
> + dbg_hid("submitting ctrl urb: %s wValue=0x%04x wIndex=0x%04x wLength=%u\n",
> + usbhid->cr->bRequest == HID_REQ_SET_REPORT ? "Set_Report" : "Get_Report",
> + usbhid->cr->wValue, usbhid->cr->wIndex, usbhid->cr->wLength);
>
> - if (usb_submit_urb(usbhid->urbctrl, GFP_ATOMIC)) {
> - err_hid("usb_submit_urb(ctrl) failed");
> - return -1;
> + if (usb_submit_urb(usbhid->urbctrl, GFP_ATOMIC)) {
> + err_hid("usb_submit_urb(ctrl) failed");
> + return -1;
> + }
> + } else {
> + /*
> + * queue work to wake up the device.
> + * as the work queue is freezeable, this is safe
> + * with respect to STD and STR
> + */
> + queue_work(resumption_waker, &usbhid->restart_work);
> }
>
> return 0;
> @@ -332,7 +413,7 @@ static void hid_irq_out(struct urb *urb)
> "received\n", urb->status);
> }
>
> - spin_lock_irqsave(&usbhid->outlock, flags);
> + spin_lock_irqsave(&usbhid->lock, flags);
>
> if (unplug)
> usbhid->outtail = usbhid->outhead;
> @@ -344,12 +425,12 @@ static void hid_irq_out(struct urb *urb)
> clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
> wake_up(&usbhid->wait);
> }
> - spin_unlock_irqrestore(&usbhid->outlock, flags);
> + spin_unlock_irqrestore(&usbhid->lock, flags);
> return;
> }
>
> clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
> - spin_unlock_irqrestore(&usbhid->outlock, flags);
> + spin_unlock_irqrestore(&usbhid->lock, flags);
> wake_up(&usbhid->wait);
> }
>
> @@ -361,12 +442,11 @@ static void hid_ctrl(struct urb *urb)
> {
> struct hid_device *hid = urb->context;
> struct usbhid_device *usbhid = hid->driver_data;
> - unsigned long flags;
> - int unplug = 0;
> + int unplug = 0, status = urb->status;
>
> - spin_lock_irqsave(&usbhid->ctrllock, flags);
> + spin_lock(&usbhid->lock);
>
> - switch (urb->status) {
> + switch (status) {
> case 0: /* success */
> if (usbhid->ctrl[usbhid->ctrltail].dir == USB_DIR_IN)
> hid_input_report(urb->context,
> @@ -383,7 +463,7 @@ static void hid_ctrl(struct urb *urb)
> break;
> default: /* error */
> dev_warn(&urb->dev->dev, "ctrl urb status %d "
> - "received\n", urb->status);
> + "received\n", status);
> }
>
> if (unplug)
> @@ -396,19 +476,18 @@ static void hid_ctrl(struct urb *urb)
> clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
> wake_up(&usbhid->wait);
> }
> - spin_unlock_irqrestore(&usbhid->ctrllock, flags);
> + spin_unlock(&usbhid->lock);
> return;
> }
>
> clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
> - spin_unlock_irqrestore(&usbhid->ctrllock, flags);
> + spin_unlock(&usbhid->lock);
> wake_up(&usbhid->wait);
> }
>
> -void usbhid_submit_report(struct hid_device *hid, struct hid_report *report, unsigned char dir)
> +void __usbhid_submit_report(struct hid_device *hid, struct hid_report *report, unsigned char dir)
> {
> int head;
> - unsigned long flags;
> struct usbhid_device *usbhid = hid->driver_data;
> int len = ((report->size - 1) >> 3) + 1 + (report->id > 0);
>
> @@ -416,18 +495,13 @@ void usbhid_submit_report(struct hid_device *hid, struct hid_report *report, uns
> return;
>
> if (usbhid->urbout && dir == USB_DIR_OUT && report->type == HID_OUTPUT_REPORT) {
> -
> - spin_lock_irqsave(&usbhid->outlock, flags);
> -
> if ((head = (usbhid->outhead + 1) & (HID_OUTPUT_FIFO_SIZE - 1)) == usbhid->outtail) {
> - spin_unlock_irqrestore(&usbhid->outlock, flags);
> dev_warn(&hid->dev, "output queue full\n");
> return;
> }
>
> usbhid->out[usbhid->outhead].raw_report = kmalloc(len, GFP_ATOMIC);
> if (!usbhid->out[usbhid->outhead].raw_report) {
> - spin_unlock_irqrestore(&usbhid->outlock, flags);
> dev_warn(&hid->dev, "output queueing failed\n");
> return;
> }
> @@ -438,15 +512,10 @@ void usbhid_submit_report(struct hid_device *hid, struct hid_report *report, uns
> if (!test_and_set_bit(HID_OUT_RUNNING, &usbhid->iofl))
> if (hid_submit_out(hid))
> clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
> -
> - spin_unlock_irqrestore(&usbhid->outlock, flags);
> return;
> }
>
> - spin_lock_irqsave(&usbhid->ctrllock, flags);
> -
> if ((head = (usbhid->ctrlhead + 1) & (HID_CONTROL_FIFO_SIZE - 1)) == usbhid->ctrltail) {
> - spin_unlock_irqrestore(&usbhid->ctrllock, flags);
> dev_warn(&hid->dev, "control queue full\n");
> return;
> }
> @@ -454,7 +523,6 @@ void usbhid_submit_report(struct hid_device *hid, struct hid_report *report, uns
> if (dir == USB_DIR_OUT) {
> usbhid->ctrl[usbhid->ctrlhead].raw_report = kmalloc(len, GFP_ATOMIC);
> if (!usbhid->ctrl[usbhid->ctrlhead].raw_report) {
> - spin_unlock_irqrestore(&usbhid->ctrllock, flags);
> dev_warn(&hid->dev, "control queueing failed\n");
> return;
> }
> @@ -467,15 +535,25 @@ void usbhid_submit_report(struct hid_device *hid, struct hid_report *report, uns
> if (!test_and_set_bit(HID_CTRL_RUNNING, &usbhid->iofl))
> if (hid_submit_ctrl(hid))
> clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
> +}
>
> - spin_unlock_irqrestore(&usbhid->ctrllock, flags);
> +void usbhid_submit_report(struct hid_device *hid, struct hid_report *report, unsigned char dir)
> +{
> + struct usbhid_device *usbhid = hid->driver_data;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&usbhid->lock, flags);
> + __usbhid_submit_report(hid, report, dir);
> + spin_unlock_irqrestore(&usbhid->lock, flags);
> }
> EXPORT_SYMBOL_GPL(usbhid_submit_report);
>
> static int usb_hidinput_input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
> {
> struct hid_device *hid = input_get_drvdata(dev);
> + struct usbhid_device *usbhid = hid->driver_data;
> struct hid_field *field;
> + unsigned long flags;
> int offset;
>
> if (type == EV_FF)
> @@ -490,6 +568,15 @@ static int usb_hidinput_input_event(struct input_dev *dev, unsigned int type, un
> }
>
> hid_set_field(field, offset, value);
> + if (value) {
> + spin_lock_irqsave(&usbhid->lock, flags);
> + usbhid->ledcount++;
> + spin_unlock_irqrestore(&usbhid->lock, flags);
> + } else {
> + spin_lock_irqsave(&usbhid->lock, flags);
> + usbhid->ledcount--;
> + spin_unlock_irqrestore(&usbhid->lock, flags);
> + }
> usbhid_submit_report(hid, field->report, USB_DIR_OUT);
>
> return 0;
> @@ -538,15 +625,22 @@ int usbhid_open(struct hid_device *hid)
> struct usbhid_device *usbhid = hid->driver_data;
> int res;
>
> + mutex_lock(&hid_open_mut);
> if (!hid->open++) {
> res = usb_autopm_get_interface(usbhid->intf);
> + /* the device must be awake to reliable request remote wakeup */
> if (res < 0) {
> hid->open--;
> + mutex_unlock(&hid_open_mut);
> return -EIO;
> }
> + usbhid->intf->needs_remote_wakeup = 1;
> + if (hid_start_in(hid))
> + hid_io_error(hid);
> +
> + usb_autopm_put_interface(usbhid->intf);
> }
> - if (hid_start_in(hid))
> - hid_io_error(hid);
> + mutex_unlock(&hid_open_mut);
> return 0;
> }
>
> @@ -554,10 +648,22 @@ void usbhid_close(struct hid_device *hid)
> {
> struct usbhid_device *usbhid = hid->driver_data;
>
> + mutex_lock(&hid_open_mut);
> +
> + /* protecting hid->open to make sure we don't restart
> + * data acquistion due to a resumption we no longer
> + * care about
> + */
> + spin_lock_irq(&usbhid->lock);
> if (!--hid->open) {
> + spin_unlock_irq(&usbhid->lock);
> usb_kill_urb(usbhid->urbin);
> - usb_autopm_put_interface(usbhid->intf);
> + flush_scheduled_work();
> + usbhid->intf->needs_remote_wakeup = 0;
> + } else {
> + spin_unlock_irq(&usbhid->lock);
> }
> + mutex_unlock(&hid_open_mut);
> }
>
> /*
> @@ -686,6 +792,25 @@ static int usbhid_output_raw_report(struct hid_device *hid, __u8 *buf, size_t co
> return ret;
> }
>
> +static void usbhid_restart_queues(struct usbhid_device *usbhid)
> +{
> + if (usbhid->urbout)
> + usbhid_restart_out_queue(usbhid);
> + usbhid_restart_ctrl_queue(usbhid);
> +}
> +
> +static void __usbhid_restart_queues(struct work_struct *work)
> +{
> + struct usbhid_device *usbhid =
> + container_of(work, struct usbhid_device, restart_work);
> + int r;
> +
> + r = usb_autopm_get_interface(usbhid->intf);
> + if (r < 0)
> + return;
> + usb_autopm_put_interface(usbhid->intf);
> +}
> +
> static void hid_free_buffers(struct usb_device *dev, struct hid_device *hid)
> {
> struct usbhid_device *usbhid = hid->driver_data;
> @@ -864,11 +989,11 @@ static int usbhid_start(struct hid_device *hid)
>
> init_waitqueue_head(&usbhid->wait);
> INIT_WORK(&usbhid->reset_work, hid_reset);
> + INIT_WORK(&usbhid->restart_work, __usbhid_restart_queues);
> setup_timer(&usbhid->io_retry, hid_retry_timeout, (unsigned long) hid);
>
> - spin_lock_init(&usbhid->inlock);
> - spin_lock_init(&usbhid->outlock);
> - spin_lock_init(&usbhid->ctrllock);
> + spin_lock_init(&usbhid->lock);
> + spin_lock_init(&usbhid->lock);
>
> usbhid->intf = intf;
> usbhid->ifnum = interface->desc.bInterfaceNumber;
> @@ -907,14 +1032,15 @@ static void usbhid_stop(struct hid_device *hid)
> if (WARN_ON(!usbhid))
> return;
>
> - spin_lock_irq(&usbhid->inlock); /* Sync with error handler */
> + spin_lock_irq(&usbhid->lock); /* Sync with error handler */
> set_bit(HID_DISCONNECTED, &usbhid->iofl);
> - spin_unlock_irq(&usbhid->inlock);
> + spin_unlock_irq(&usbhid->lock);
> usb_kill_urb(usbhid->urbin);
> usb_kill_urb(usbhid->urbout);
> usb_kill_urb(usbhid->urbctrl);
>
> del_timer_sync(&usbhid->io_retry);
> + cancel_work_sync(&usbhid->restart_work);
> cancel_work_sync(&usbhid->reset_work);
>
> if (hid->claimed & HID_CLAIMED_INPUT)
> @@ -1020,16 +1146,67 @@ static void hid_disconnect(struct usb_interface *intf)
> hid_destroy_device(hid);
> }
>
> +static void hid_cease_io(struct usbhid_device *usbhid)
> +{
> + del_timer(&usbhid->io_retry);
> + usb_kill_urb(usbhid->urbin);
> + usb_kill_urb(usbhid->urbctrl);
> + usb_kill_urb(usbhid->urbout);
> + flush_scheduled_work();
> +}
> +
> static int hid_suspend(struct usb_interface *intf, pm_message_t message)
> {
> - struct hid_device *hid = usb_get_intfdata (intf);
> + struct hid_device *hid = usb_get_intfdata(intf);
> struct usbhid_device *usbhid = hid->driver_data;
> + struct usb_device *udev = interface_to_usbdev(intf);
> + int status;
>
> - spin_lock_irq(&usbhid->inlock); /* Sync with error handler */
> - set_bit(HID_SUSPENDED, &usbhid->iofl);
> - spin_unlock_irq(&usbhid->inlock);
> - del_timer(&usbhid->io_retry);
> - usb_kill_urb(usbhid->urbin);
> + if (udev->auto_pm) {
> + spin_lock_irq(&usbhid->lock); /* Sync with error handler */
> + if (!test_bit(HID_RESET_PENDING, &usbhid->iofl)
> + && !test_bit(HID_CLEAR_HALT, &usbhid->iofl)
> + && !test_bit(HID_OUT_RUNNING, &usbhid->iofl)
> + && !test_bit(HID_CTRL_RUNNING, &usbhid->iofl)
> + && !test_bit(HID_KEYS_PRESSED, &usbhid->iofl)
> + && (!usbhid->ledcount || ignoreled))
> + {
> + set_bit(HID_REPORTED_IDLE, &usbhid->iofl);
> + spin_unlock_irq(&usbhid->lock);
> + } else {
> + usbhid_mark_busy(usbhid);
> + spin_unlock_irq(&usbhid->lock);
> + return -EBUSY;
> + }
> +
> + } else {
> + spin_lock_irq(&usbhid->lock);
> + set_bit(HID_REPORTED_IDLE, &usbhid->iofl);
> + spin_unlock_irq(&usbhid->lock);
> + if (usbhid_wait_io(hid) < 0)
> + return -EIO;
> + }
> +
> + if (!ignoreled && udev->auto_pm) {
> + spin_lock_irq(&usbhid->lock);
> + if (test_bit(HID_LED_ON, &usbhid->iofl)) {
> + spin_unlock_irq(&usbhid->lock);
> + usbhid_mark_busy(usbhid);
> + return -EBUSY;
> + }
> + spin_unlock_irq(&usbhid->lock);
> + }
> +
> + hid_cease_io(usbhid);
> +
> + if (udev->auto_pm && test_bit(HID_KEYS_PRESSED, &usbhid->iofl)) {
> + /* lost race against keypresses */
> + status = hid_start_in(hid);
> + if (status < 0)
> + hid_io_error(hid);
> + usbhid_mark_busy(usbhid);
> + return -EBUSY;
> + }
> dev_dbg(&intf->dev, "suspend\n");
> return 0;
> }
> @@ -1040,18 +1217,30 @@ static int hid_resume(struct usb_interface *intf)
> struct usbhid_device *usbhid = hid->driver_data;
> int status;
>
> - clear_bit(HID_SUSPENDED, &usbhid->iofl);
> + clear_bit(HID_REPORTED_IDLE, &usbhid->iofl);
> + usbhid_mark_busy(usbhid);
> +
> usbhid->retry_delay = 0;
> status = hid_start_in(hid);
> + if (status < 0)
> + hid_io_error(hid);
> + usbhid_restart_queues(usbhid);
> +
> dev_dbg(&intf->dev, "resume status %d\n", status);
> - return status;
> + return 0;
> }
>
> /* Treat USB reset pretty much the same as suspend/resume */
> static int hid_pre_reset(struct usb_interface *intf)
> {
> - /* FIXME: What if the interface is already suspended? */
> - hid_suspend(intf, PMSG_ON);
> + struct hid_device *hid = usb_get_intfdata(intf);
> + struct usbhid_device *usbhid = hid->driver_data;
> +
> + spin_lock_irq(&usbhid->lock);
> + set_bit(HID_RESET_PENDING, &usbhid->iofl);
> + spin_unlock_irq(&usbhid->lock);
> + hid_cease_io(usbhid);
> +
> return 0;
> }
>
> @@ -1059,11 +1248,35 @@ static int hid_pre_reset(struct usb_interface *intf)
> static int hid_post_reset(struct usb_interface *intf)
> {
> struct usb_device *dev = interface_to_usbdev (intf);
> -
> + struct hid_device *hid = usb_get_intfdata(intf);
> + struct usbhid_device *usbhid = hid->driver_data;
> + int status;
> +
> + spin_lock_irq(&usbhid->lock);
> + clear_bit(HID_RESET_PENDING, &usbhid->iofl);
> + spin_unlock_irq(&usbhid->lock);
> hid_set_idle(dev, intf->cur_altsetting->desc.bInterfaceNumber, 0, 0);
> /* FIXME: Any more reinitialization needed? */
> + status = hid_start_in(hid);
> + if (status < 0)
> + hid_io_error(hid);
> + usbhid_restart_queues(usbhid);
>
> - return hid_resume(intf);
> + return 0;
> +}
> +
> +int usbhid_get_power(struct hid_device *hid)
> +{
> + struct usbhid_device *usbhid = hid->driver_data;
> +
> + return usb_autopm_get_interface(usbhid->intf);
> +}
> +
> +void usbhid_put_power(struct hid_device *hid)
> +{
> + struct usbhid_device *usbhid = hid->driver_data;
> +
> + usb_autopm_put_interface(usbhid->intf);
> }
>
> static struct usb_device_id hid_usb_ids [] = {
> @@ -1099,7 +1312,11 @@ static struct hid_driver hid_usb_driver = {
>
> static int __init hid_init(void)
> {
> - int retval;
> + int retval = -ENOMEM;
> +
> + resumption_waker = create_freezeable_workqueue("usbhid_resumer");
> + if (!resumption_waker)
> + goto no_queue;
> retval = hid_register_driver(&hid_usb_driver);
> if (retval)
> goto hid_register_fail;
> @@ -1123,6 +1340,8 @@ hiddev_init_fail:
> usbhid_quirks_init_fail:
> hid_unregister_driver(&hid_usb_driver);
> hid_register_fail:
> + destroy_workqueue(resumption_waker);
> +no_queue:
> return retval;
> }
>
> @@ -1132,6 +1351,7 @@ static void __exit hid_exit(void)
> hiddev_exit();
> usbhid_quirks_exit();
> hid_unregister_driver(&hid_usb_driver);
> + destroy_workqueue(resumption_waker);
> }
>
> module_init(hid_init);
> --- a/drivers/hid/usbhid/hiddev.c
> +++ b/drivers/hid/usbhid/hiddev.c
> @@ -249,10 +249,12 @@ static int hiddev_release(struct inode * inode, struct file * file)
> spin_unlock_irqrestore(&list->hiddev->list_lock, flags);
>
> if (!--list->hiddev->open) {
> - if (list->hiddev->exist)
> + if (list->hiddev->exist) {
> usbhid_close(list->hiddev->hid);
> - else
> + usbhid_put_power(list->hiddev->hid);
> + } else {
> kfree(list->hiddev);
> + }
> }
>
> kfree(list);
> @@ -267,6 +269,7 @@ static int hiddev_open(struct inode *inode, struct file *file)
> {
> struct hiddev_list *list;
> unsigned long flags;
> + int res;
>
> int i = iminor(inode) - HIDDEV_MINOR_BASE;
>
> @@ -285,8 +288,13 @@ static int hiddev_open(struct inode *inode, struct file *file)
> file->private_data = list;
>
> if (!list->hiddev->open++)
> - if (list->hiddev->exist)
> - usbhid_open(hiddev_table[i]->hid);
> + if (list->hiddev->exist) {
> + struct hid_device *hid = hiddev_table[i]->hid;
> + res = usbhid_get_power(hid);
> + if (res < 0)
> + return -EIO;
> + usbhid_open(hid);
> + }
>
> return 0;
> }
> --- a/drivers/hid/usbhid/usbhid.h
> +++ b/drivers/hid/usbhid/usbhid.h
> @@ -37,7 +37,10 @@ int usbhid_wait_io(struct hid_device* hid);
> void usbhid_close(struct hid_device *hid);
> int usbhid_open(struct hid_device *hid);
> void usbhid_init_reports(struct hid_device *hid);
> -void usbhid_submit_report(struct hid_device *hid, struct hid_report *report, unsigned char dir);
> +void usbhid_submit_report
> +(struct hid_device *hid, struct hid_report *report, unsigned char dir);
> +int usbhid_get_power(struct hid_device *hid);
> +void usbhid_put_power(struct hid_device *hid);
>
> /*
> * USB-specific HID struct, to be pointed to
> @@ -55,7 +58,6 @@ struct usbhid_device {
> struct urb *urbin; /* Input URB */
> char *inbuf; /* Input buffer */
> dma_addr_t inbuf_dma; /* Input buffer dma */
> - spinlock_t inlock; /* Input fifo spinlock */
>
> struct urb *urbctrl; /* Control URB */
> struct usb_ctrlrequest *cr; /* Control request struct */
> @@ -64,21 +66,22 @@ struct usbhid_device {
> unsigned char ctrlhead, ctrltail; /* Control fifo head & tail */
> char *ctrlbuf; /* Control buffer */
> dma_addr_t ctrlbuf_dma; /* Control buffer dma */
> - spinlock_t ctrllock; /* Control fifo spinlock */
>
> struct urb *urbout; /* Output URB */
> struct hid_output_fifo out[HID_CONTROL_FIFO_SIZE]; /* Output pipe fifo */
> unsigned char outhead, outtail; /* Output pipe fifo head & tail */
> char *outbuf; /* Output buffer */
> dma_addr_t outbuf_dma; /* Output buffer dma */
> - spinlock_t outlock; /* Output fifo spinlock */
>
> + spinlock_t lock; /* fifo spinlock */
> unsigned long iofl; /* I/O flags (CTRL_RUNNING, OUT_RUNNING) */
> struct timer_list io_retry; /* Retry timer */
> unsigned long stop_retry; /* Time to give up, in jiffies */
> unsigned int retry_delay; /* Delay length in ms */
> struct work_struct reset_work; /* Task context for resets */
> + struct work_struct restart_work; /* waking up for output to be done in a task */
> wait_queue_head_t wait; /* For sleeping */
> + int ledcount; /* counting the number of active leds */
> };
>
> #define hid_to_usb_dev(hid_dev) \
> --- a/include/linux/hid.h
> +++ b/include/linux/hid.h
> @@ -410,6 +410,9 @@ struct hid_output_fifo {
> #define HID_SUSPENDED 5
> #define HID_CLEAR_HALT 6
> #define HID_DISCONNECTED 7
> +#define HID_REPORTED_IDLE 8
> +#define HID_KEYS_PRESSED 9
> +#define HID_LED_ON 10
>
> struct hid_input {
> struct list_head list;
> @@ -638,6 +641,7 @@ int hidinput_find_field(struct hid_device *hid, unsigned int type, unsigned int
> void hid_output_report(struct hid_report *report, __u8 *data);
> 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);
>
> /**
>
>
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