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Subject[PATCH 26/37] Input: wacom - implement suspend and autosuspend
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This implements suspend and autosuspend support for wacom devices.
It works by using the usb last busy functionality triggered in the
completion callback.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
---
drivers/input/tablet/wacom.h | 3 +
drivers/input/tablet/wacom_sys.c | 76 +++++++++++++++++++++++++++++++++-----
2 files changed, 69 insertions(+), 10 deletions(-)
diff --git a/drivers/input/tablet/wacom.h b/drivers/input/tablet/wacom.h
index acf9830..706619d 100644
--- a/drivers/input/tablet/wacom.h
+++ b/drivers/input/tablet/wacom.h
@@ -101,8 +101,11 @@ struct wacom {
dma_addr_t data_dma;
struct input_dev *dev;
struct usb_device *usbdev;
+ struct usb_interface *intf;
struct urb *irq;
struct wacom_wac * wacom_wac;
+ struct mutex lock;
+ int open:1;
char phys[32];
};

diff --git a/drivers/input/tablet/wacom_sys.c b/drivers/input/tablet/wacom_sys.c
index 41caaef..71cc0c1 100644
--- a/drivers/input/tablet/wacom_sys.c
+++ b/drivers/input/tablet/wacom_sys.c
@@ -70,6 +70,7 @@ static void wacom_sys_irq(struct urb *urb)
input_sync(get_input_dev(&wcombo));

exit:
+ usb_mark_last_busy(wacom->usbdev);
retval = usb_submit_urb (urb, GFP_ATOMIC);
if (retval)
err ("%s - usb_submit_urb failed with result %d",
@@ -124,10 +125,25 @@ static int wacom_open(struct input_dev *dev)
{
struct wacom *wacom = input_get_drvdata(dev);

+ mutex_lock(&wacom->lock);
+
wacom->irq->dev = wacom->usbdev;
- if (usb_submit_urb(wacom->irq, GFP_KERNEL))
+
+ if (usb_autopm_get_interface(wacom->intf) < 0) {
+ mutex_unlock(&wacom->lock);
return -EIO;
+ }
+
+ if (usb_submit_urb(wacom->irq, GFP_KERNEL)) {
+ usb_autopm_put_interface(wacom->intf);
+ mutex_unlock(&wacom->lock);
+ return -EIO;
+ }
+
+ wacom->open = 1;
+ wacom->intf->needs_remote_wakeup = 1;

+ mutex_unlock(&wacom->lock);
return 0;
}

@@ -135,7 +151,11 @@ static void wacom_close(struct input_dev *dev)
{
struct wacom *wacom = input_get_drvdata(dev);

+ mutex_lock(&wacom->lock);
usb_kill_urb(wacom->irq);
+ wacom->open = 0;
+ wacom->intf->needs_remote_wakeup = 0;
+ mutex_unlock(&wacom->lock);
}

void input_dev_mo(struct input_dev *input_dev, struct wacom_wac *wacom_wac)
@@ -243,6 +263,8 @@ static int wacom_probe(struct usb_interface *intf, const struct usb_device_id *i

wacom->usbdev = dev;
wacom->dev = input_dev;
+ wacom->intf = intf;
+ mutex_init(&wacom->lock);
usb_make_path(dev, wacom->phys, sizeof(wacom->phys));
strlcat(wacom->phys, "/input0", sizeof(wacom->phys));

@@ -304,23 +326,57 @@ static int wacom_probe(struct usb_interface *intf, const struct usb_device_id *i

static void wacom_disconnect(struct usb_interface *intf)
{
- struct wacom *wacom = usb_get_intfdata (intf);
+ struct wacom *wacom = usb_get_intfdata(intf);

usb_set_intfdata(intf, NULL);
- if (wacom) {
- usb_kill_urb(wacom->irq);
- input_unregister_device(wacom->dev);
- usb_free_urb(wacom->irq);
- usb_buffer_free(interface_to_usbdev(intf), 10, wacom->wacom_wac->data, wacom->data_dma);
- kfree(wacom->wacom_wac);
- kfree(wacom);
- }
+
+ usb_kill_urb(wacom->irq);
+ input_unregister_device(wacom->dev);
+ usb_free_urb(wacom->irq);
+ usb_buffer_free(interface_to_usbdev(intf), 10, wacom->wacom_wac->data, wacom->data_dma);
+ kfree(wacom->wacom_wac);
+ kfree(wacom);
+}
+
+static int wacom_suspend(struct usb_interface *intf, pm_message_t message)
+{
+ struct wacom *wacom = usb_get_intfdata(intf);
+
+ mutex_lock(&wacom->lock);
+ usb_kill_urb(wacom->irq);
+ mutex_unlock(&wacom->lock);
+
+ return 0;
+}
+
+static int wacom_resume(struct usb_interface *intf)
+{
+ struct wacom *wacom = usb_get_intfdata(intf);
+ int rv;
+
+ mutex_lock(&wacom->lock);
+ if (wacom->open)
+ rv = usb_submit_urb(wacom->irq, GFP_NOIO);
+ else
+ rv = 0;
+ mutex_unlock(&wacom->lock);
+
+ return rv;
+}
+
+static int wacom_reset_resume(struct usb_interface *intf)
+{
+ return wacom_resume(intf);
}

static struct usb_driver wacom_driver = {
.name = "wacom",
.probe = wacom_probe,
.disconnect = wacom_disconnect,
+ .suspend = wacom_suspend,
+ .resume = wacom_resume,
+ .reset_resume = wacom_reset_resume,
+ .supports_autosuspend = 1,
};

static int __init wacom_init(void)
--
1.5.5.rc2.6.gf58d



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