Re: suspend

Re: suspend

[Oliver Neukum]

Am Donnerstag, 3. April 2008 10:53:53 schrieb Stefan Schweizer:
> >  On second thought, this should be fixed by usb persist if the appletouch
> >  driver supported reset_resume. Would you be willing to test a kernel patch
> >  that implements reset_resume in the appletouch driver?
> 
> Sure, I would love to have this fixed :-)

Then, here's the patch. Testing this is not trivial. Please
compile your kernel with CONFIG_USB_SUSPEND and CONFIG_USB_PERSIST.
To use the feature you need to switch it on as described in
Documentation/usb/persist.txt

	Regards
		Oliver

----

--- linux-2.6.25-rc7-vanilla/drivers/input/mouse/appletouch.c	2008-03-31 15:16:40.000000000 +0200
+++ linux-2.6.25-rc7-work/drivers/input/mouse/appletouch.c	2008-04-03 12:17:01.000000000 +0200
@@ -32,6 +32,7 @@
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/module.h>
+#include <linux/mutex.h>
 #include <linux/usb/input.h>
 
 /* Apple has powerbooks which have the keyboard with different Product IDs */
@@ -158,6 +159,7 @@ struct atp {
 	int			datalen;	/* size of an USB urb transfer */
 	int			idlecount;      /* number of empty packets */
 	struct work_struct      work;
+	struct mutex		lock;
 };
 
 #define dbg_dump(msg, tab) \
@@ -562,10 +564,14 @@ static int atp_open(struct input_dev *in
 {
 	struct atp *dev = input_get_drvdata(input);
 
-	if (usb_submit_urb(dev->urb, GFP_ATOMIC))
+	mutex_lock(&dev->lock);
+	if (usb_submit_urb(dev->urb, GFP_KERNEL)) {
+		mutex_unlock(&dev->lock);
 		return -EIO;
+	}
 
 	dev->open = 1;
+	mutex_unlock(&dev->lock);
 	return 0;
 }
 
@@ -573,9 +579,25 @@ static void atp_close(struct input_dev *
 {
 	struct atp *dev = input_get_drvdata(input);
 
+	mutex_lock(&dev->lock);
 	usb_kill_urb(dev->urb);
 	cancel_work_sync(&dev->work);
 	dev->open = 0;
+	mutex_unlock(&dev->lock);
+}
+
+static int handle_geyser(struct atp *dev)
+{
+	struct usb_device *udev = dev->udev;
+
+	if (!atp_is_fountain(dev)) {
+		/* switch to raw sensor mode */
+		if (atp_geyser_init(udev))
+			return -EIO;
+
+		printk(KERN_INFO "appletouch: Geyser mode initialized.\n");
+	}
+	return 0;
 }
 
 static int atp_probe(struct usb_interface *iface, const struct usb_device_id *id)
@@ -612,6 +634,7 @@ static int atp_probe(struct usb_interfac
 		goto err_free_devs;
 	}
 
+	mutex_init(&dev->lock);
 	dev->udev = udev;
 	dev->input = input_dev;
 	dev->overflowwarn = 0;
@@ -622,13 +645,8 @@ static int atp_probe(struct usb_interfac
 	else
 		dev->datalen = 81;
 
-	if (!atp_is_fountain(dev)) {
-		/* switch to raw sensor mode */
-		if (atp_geyser_init(udev))
-			goto err_free_devs;
-
-		printk(KERN_INFO "appletouch: Geyser mode initialized.\n");
-	}
+	if (handle_geyser(dev) < 0)
+		goto err_free_devs;
 
 	dev->urb = usb_alloc_urb(0, GFP_KERNEL);
 	if (!dev->urb)
@@ -747,18 +765,63 @@ static int atp_resume(struct usb_interfa
 {
 	struct atp *dev = usb_get_intfdata(iface);
 
-	if (dev->open && usb_submit_urb(dev->urb, GFP_ATOMIC))
+	if (dev->open && usb_submit_urb(dev->urb, GFP_NOIO))
 		return -EIO;
 
 	return 0;
 }
 
+static int recover_dev(struct atp *dev)
+{
+	int rv;
+
+	rv = handle_geyser(dev);
+	if (rv < 0)
+		return rv;
+
+	if (dev->open && usb_submit_urb(dev->urb, GFP_NOIO))
+		return -EIO;
+
+	return 0;	
+}
+
+static int atp_pre_reset(struct usb_interface *iface)
+{
+	struct atp *dev = usb_get_intfdata(iface);
+
+	mutex_lock(&dev->lock);
+	if (dev->open)
+		usb_kill_urb(dev->urb);
+
+	return 0;
+}
+
+static int atp_post_reset(struct usb_interface *iface)
+{
+	struct atp *dev = usb_get_intfdata(iface);
+	int rv;
+
+	rv = recover_dev(dev);
+	mutex_unlock(&dev->lock);
+	return rv;
+}
+
+static int atp_reset_resume(struct usb_interface *iface)
+{
+	struct atp *dev = usb_get_intfdata(iface);
+
+	return recover_dev(dev);
+}
+
 static struct usb_driver atp_driver = {
 	.name		= "appletouch",
 	.probe		= atp_probe,
 	.disconnect	= atp_disconnect,
 	.suspend	= atp_suspend,
 	.resume		= atp_resume,
+	.reset_resume	= atp_reset_resume,
+	.pre_reset	= atp_pre_reset,
+	.post_reset	= atp_post_reset,
 	.id_table	= atp_table,
 };
 
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Re: suspend

[Oliver Neukum]

Am Donnerstag, 3. April 2008 10:53:53 schrieb Stefan Schweizer:
> >  On second thought, this should be fixed by usb persist if the appletouch
> >  driver supported reset_resume. Would you be willing to test a kernel patch
> >  that implements reset_resume in the appletouch driver?
> 
> Sure, I would love to have this fixed :-)

Hi,

here I have another test request. This patch on top of the earlier patch
implements autosuspend for the appletouch driver. Can you try it? You
also need to activate it as described in Documentation/usb/power-management.txt

	Regards
		Oliver

---

--- linux-2.6.25-rc7-work/drivers/input/mouse/appletouch.c.alt	2008-04-03 12:46:06.000000000 +0200
+++ linux-2.6.25-rc7-work/drivers/input/mouse/appletouch.c	2008-04-03 12:46:24.000000000 +0200
@@ -572,16 +572,26 @@ exit:
 static int atp_open(struct input_dev *input)
 {
 	struct atp *dev = input_get_drvdata(input);
+	int rv;
 
 	mutex_lock(&dev->lock);
-	if (usb_submit_urb(dev->urb, GFP_KERNEL)) {
-		mutex_unlock(&dev->lock);
-		return -EIO;
-	}
+
+	rv = usb_autopm_get_interface(dev->intf);
+	if ( rv < 0)
+		goto err_out;
+
+	rv = usb_submit_urb(dev->urb, GFP_KERNEL);
+	if (rv < 0)
+		goto err_put;
 
 	dev->open = 1;
+	dev->intf->needs_remote_wakeup = 1;
+
+err_put:
+	usb_autopm_put_interface(dev->intf);
+err_out:
 	mutex_unlock(&dev->lock);
-	return 0;
+	return rv;
 }
 
 static void atp_close(struct input_dev *input)
@@ -592,6 +602,7 @@ static void atp_close(struct input_dev *
 	usb_kill_urb(dev->urb);
 	cancel_work_sync(&dev->work);
 	dev->open = 0;
+	dev->intf->needs_remote_wakeup = 0;
 	mutex_unlock(&dev->lock);
 }
 

Re: suspend

[Stefan Schweizer]

On Thu, Apr 3, 2008 at 12:58 PM, Oliver Neukum <oliver@neukum.org> wrote:
>  here I have another test request. This patch on top of the earlier patch
>  implements autosuspend for the appletouch driver. Can you try it? You
>  also need to activate it as described in Documentation/usb/power-management.txt

this one fails to build with  several
struct atp has no element intf
errors.

trying the other one only now

regards,
Stefan

Re: suspend

[Stefan Schweizer]

Cannot seem to find the persist attribute even after this patch applied :((

CONFIG_USB_PERSIST is enabled, but other drivers do not provide it.
However this is 2.6.24 - I will try it on 2.6.25 now.

macbook linux # ls -dl /sys/bus/usb/devices/1-2\:1.1/driver
lrwxrwxrwx 1 root root 0  3. Apr 17:12
/sys/bus/usb/devices/1-2:1.1/driver ->
../../../../../../bus/usb/drivers/appletouch
macbook linux # find /sys/bus/usb/devices/1-2\:1.1/ | grep power
/sys/bus/usb/devices/1-2:1.1/power
/sys/bus/usb/devices/1-2:1.1/power/wakeup
/sys/bus/usb/devices/1-2:1.1/input/input7/power
/sys/bus/usb/devices/1-2:1.1/input/input7/power/wakeup
/sys/bus/usb/devices/1-2:1.1/input/input7/mouse2/power
/sys/bus/usb/devices/1-2:1.1/input/input7/mouse2/power/wakeup
/sys/bus/usb/devices/1-2:1.1/input/input7/event7/power
/sys/bus/usb/devices/1-2:1.1/input/input7/event7/power/wakeup
/sys/bus/usb/devices/1-2:1.1/usb_endpoint/usbdev1.5_ep81/power
/sys/bus/usb/devices/1-2:1.1/usb_endpoint/usbdev1.5_ep81/power/wakeup

Best regards,
Stefan
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Re: suspend

[Oliver Neukum]

Am Donnerstag, 3. April 2008 17:44:19 schrieb Stefan Schweizer:
> Cannot seem to find the persist attribute even after this patch applied :((
> 
> CONFIG_USB_PERSIST is enabled, but other drivers do not provide it.
> However this is 2.6.24 - I will try it on 2.6.25 now.

Odd, I can't reproduce it. Alan?

	Regards
		Oliver

oneukum@tranquility:/sys/bus/usb/devices/6-1/power> ll
insgesamt 0
-r--r--r-- 1 root root 4096  3. Apr 22:40 active_duration
-rw-r--r-- 1 root root 4096  3. Apr 22:40 autosuspend
-r--r--r-- 1 root root 4096  3. Apr 22:40 connected_duration
-rw-r--r-- 1 root root 4096  3. Apr 22:40 level
-rw-r--r-- 1 root root 4096  3. Apr 22:40 persist
-rw-r--r-- 1 root root 4096  3. Apr 22:40 wakeup

Re: suspend

[Oliver Neukum]

Am Donnerstag, 3. April 2008 16:14:29 schrieb Stefan Schweizer:
> On Thu, Apr 3, 2008 at 12:58 PM, Oliver Neukum <oliver@neukum.org> wrote:
> >  here I have another test request. This patch on top of the earlier patch
> >  implements autosuspend for the appletouch driver. Can you try it? You
> >  also need to activate it as described in Documentation/usb/power-management.txt
> 
> this one fails to build with  several
> struct atp has no element intf
> errors.

Sorry. Here's a full patch.

	Regards
		Oliver

---

--- linux-2.6.25-rc7-vanilla/drivers/input/mouse/appletouch.c	2008-03-31 15:16:40.000000000 +0200
+++ linux-2.6.25-rc7-work/drivers/input/mouse/appletouch.c	2008-04-03 12:46:24.000000000 +0200
@@ -32,6 +32,7 @@
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/module.h>
+#include <linux/mutex.h>
 #include <linux/usb/input.h>
 
 /* Apple has powerbooks which have the keyboard with different Product IDs */
@@ -140,6 +141,7 @@ MODULE_DEVICE_TABLE (usb, atp_table);
 struct atp {
 	char			phys[64];
 	struct usb_device *	udev;		/* usb device */
+	struct usb_interface *	intf;		/* usb interface */
 	struct urb *		urb;		/* usb request block */
 	signed char *		data;		/* transferred data */
 	struct input_dev *	input;		/* input dev */
@@ -158,6 +160,7 @@ struct atp {
 	int			datalen;	/* size of an USB urb transfer */
 	int			idlecount;      /* number of empty packets */
 	struct work_struct      work;
+	struct mutex		lock;
 };
 
 #define dbg_dump(msg, tab) \
@@ -345,6 +348,11 @@ static inline void atp_report_fingers(st
 	input_report_key(input, BTN_TOOL_TRIPLETAP, fingers > 2);
 }
 
+static void atp_mark_busy(struct atp *dev)
+{
+	usb_mark_last_busy(dev->udev);
+}
+
 static void atp_complete(struct urb* urb)
 {
 	int x, y, x_z, y_z, x_f, y_f;
@@ -384,6 +392,9 @@ static void atp_complete(struct urb* urb
 		goto exit;
 	}
 
+	/* mark busy for autosuspend purposes */
+	atp_mark_busy(dev);
+
 	/* reorder the sensors values */
 	if (atp_is_geyser_3(dev)) {
 		memset(dev->xy_cur, 0, sizeof(dev->xy_cur));
@@ -561,21 +572,52 @@ exit:
 static int atp_open(struct input_dev *input)
 {
 	struct atp *dev = input_get_drvdata(input);
+	int rv;
 
-	if (usb_submit_urb(dev->urb, GFP_ATOMIC))
-		return -EIO;
+	mutex_lock(&dev->lock);
+
+	rv = usb_autopm_get_interface(dev->intf);
+	if ( rv < 0)
+		goto err_out;
+
+	rv = usb_submit_urb(dev->urb, GFP_KERNEL);
+	if (rv < 0)
+		goto err_put;
 
 	dev->open = 1;
-	return 0;
+	dev->intf->needs_remote_wakeup = 1;
+
+err_put:
+	usb_autopm_put_interface(dev->intf);
+err_out:
+	mutex_unlock(&dev->lock);
+	return rv;
 }
 
 static void atp_close(struct input_dev *input)
 {
 	struct atp *dev = input_get_drvdata(input);
 
+	mutex_lock(&dev->lock);
 	usb_kill_urb(dev->urb);
 	cancel_work_sync(&dev->work);
 	dev->open = 0;
+	dev->intf->needs_remote_wakeup = 0;
+	mutex_unlock(&dev->lock);
+}
+
+static int handle_geyser(struct atp *dev)
+{
+	struct usb_device *udev = dev->udev;
+
+	if (!atp_is_fountain(dev)) {
+		/* switch to raw sensor mode */
+		if (atp_geyser_init(udev))
+			return -EIO;
+
+		printk(KERN_INFO "appletouch: Geyser mode initialized.\n");
+	}
+	return 0;
 }
 
 static int atp_probe(struct usb_interface *iface, const struct usb_device_id *id)
@@ -612,7 +654,9 @@ static int atp_probe(struct usb_interfac
 		goto err_free_devs;
 	}
 
+	mutex_init(&dev->lock);
 	dev->udev = udev;
+	dev->intf = iface;
 	dev->input = input_dev;
 	dev->overflowwarn = 0;
 	if (atp_is_geyser_3(dev))
@@ -622,13 +666,8 @@ static int atp_probe(struct usb_interfac
 	else
 		dev->datalen = 81;
 
-	if (!atp_is_fountain(dev)) {
-		/* switch to raw sensor mode */
-		if (atp_geyser_init(udev))
-			goto err_free_devs;
-
-		printk(KERN_INFO "appletouch: Geyser mode initialized.\n");
-	}
+	if (handle_geyser(dev) < 0)
+		goto err_free_devs;
 
 	dev->urb = usb_alloc_urb(0, GFP_KERNEL);
 	if (!dev->urb)
@@ -747,19 +786,65 @@ static int atp_resume(struct usb_interfa
 {
 	struct atp *dev = usb_get_intfdata(iface);
 
-	if (dev->open && usb_submit_urb(dev->urb, GFP_ATOMIC))
+	if (dev->open && usb_submit_urb(dev->urb, GFP_NOIO))
 		return -EIO;
 
 	return 0;
 }
 
+static int recover_dev(struct atp *dev)
+{
+	int rv;
+
+	rv = handle_geyser(dev);
+	if (rv < 0)
+		return rv;
+
+	if (dev->open && usb_submit_urb(dev->urb, GFP_NOIO))
+		return -EIO;
+
+	return 0;	
+}
+
+static int atp_pre_reset(struct usb_interface *iface)
+{
+	struct atp *dev = usb_get_intfdata(iface);
+
+	mutex_lock(&dev->lock);
+	if (dev->open)
+		usb_kill_urb(dev->urb);
+
+	return 0;
+}
+
+static int atp_post_reset(struct usb_interface *iface)
+{
+	struct atp *dev = usb_get_intfdata(iface);
+	int rv;
+
+	rv = recover_dev(dev);
+	mutex_unlock(&dev->lock);
+	return rv;
+}
+
+static int atp_reset_resume(struct usb_interface *iface)
+{
+	struct atp *dev = usb_get_intfdata(iface);
+
+	return recover_dev(dev);
+}
+
 static struct usb_driver atp_driver = {
 	.name		= "appletouch",
 	.probe		= atp_probe,
 	.disconnect	= atp_disconnect,
 	.suspend	= atp_suspend,
 	.resume		= atp_resume,
+	.reset_resume	= atp_reset_resume,
+	.pre_reset	= atp_pre_reset,
+	.post_reset	= atp_post_reset,
 	.id_table	= atp_table,
+	.supports_autosuspend = 1,
 };
 
 static int __init atp_init(void)

Re: suspend

[Alan Stern]

On Thu, 3 Apr 2008, Oliver Neukum wrote:

> Am Donnerstag, 3. April 2008 17:44:19 schrieb Stefan Schweizer:
> > Cannot seem to find the persist attribute even after this patch applied :((
> > 
> > CONFIG_USB_PERSIST is enabled, but other drivers do not provide it.
> > However this is 2.6.24 - I will try it on 2.6.25 now.
> 
> Odd, I can't reproduce it. Alan?
> 
> 	Regards
> 		Oliver
> 
> oneukum@tranquility:/sys/bus/usb/devices/6-1/power> ll
> insgesamt 0
> -r--r--r-- 1 root root 4096  3. Apr 22:40 active_duration
> -rw-r--r-- 1 root root 4096  3. Apr 22:40 autosuspend
> -r--r--r-- 1 root root 4096  3. Apr 22:40 connected_duration
> -rw-r--r-- 1 root root 4096  3. Apr 22:40 level
> -rw-r--r-- 1 root root 4096  3. Apr 22:40 persist
> -rw-r--r-- 1 root root 4096  3. Apr 22:40 wakeup

Sometimes people run into problems when rebuilding usbcore.  Depending
on the distribution, the usbcore.ko module is sometimes loaded as part
of an initramfs image.  Merely installing the new modules won't change
the image.

Alan Stern

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Re: suspend

[Stefan Schweizer]

Hi,

the problem was that I did not identify the correct /sys entry. Anyways with

for i in $(find /sys -name persist); do echo 1 > '$i'; done

it works perfectly :-)

Thank you very much! Finally working touchpad after resume :-)

Best regards,
Stefan

Re: suspend

[Oliver Neukum]

Am Freitag, 4. April 2008 00:06:48 schrieb Stefan Schweizer:
> Hi,
> 
> the problem was that I did not identify the correct /sys entry. Anyways with
> 
> for i in $(find /sys -name persist); do echo 1 > '$i'; done
> 
> it works perfectly :-)
> 
> Thank you very much! Finally working touchpad after resume :-)

Good. Did you test the first patch or the second? Can you test whether
the device autosuspends with the combined patch I sent you?

	Regards
		Oliver

Re: suspend

[Stefan Schweizer]

Yeah, I tested it with the combined patch. How can I test if
autosuspend works? Seems to work fine so far but does not write in my
logfile. No problems found when testing.

Best regards,
Stefan

Re: suspend

[Oliver Neukum]

Am Freitag, 4. April 2008 11:20:51 schrieb Stefan Schweizer:
> Yeah, I tested it with the combined patch. How can I test if
> autosuspend works? Seems to work fine so far but does not write in my
> logfile. No problems found when testing.

Please compile your kernel with CONFIG_PM_DEBUG and follow the
instructions in Documentation/usb. You should see something in the log.

	Regards
		Oliver
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Re: suspend

[Stefan Schweizer]

On Fri, Apr 4, 2008 at 1:36 PM, Oliver Neukum <oliver@neukum.org> wrote:
> Am Freitag, 4. April 2008 11:20:51 schrieb Stefan Schweizer:
>
> > Yeah, I tested it with the combined patch. How can I test if
>  > autosuspend works? Seems to work fine so far but does not write in my
>  > logfile. No problems found when testing.
>
>  Please compile your kernel with CONFIG_PM_DEBUG and follow the
>  instructions in Documentation/usb. You should see something in the log.

there is still no information in dmesg when I use the device. Do I
need more debugging maybe?

That is one rmmod; modprobe cycle:

usbcore: deregistering interface driver appletouch
PM: Removing info for No Bus:mouse1
PM: Removing info for No Bus:event5
PM: Removing info for No Bus:input5
input: appletouch disconnected
appletouch: Geyser mode initialized.
PM: Adding info for No Bus:input12
input: appletouch as
/devices/pci0000:00/0000:00:1d.0/usb2/2-2/2-2:1.1/input/input12
PM: Adding info for No Bus:mouse1
PM: Adding info for No Bus:event5
usbcore: registered new interface driver appletouch

Best regards,
Stefan

Re: suspend

[Oliver Neukum]

Am Samstag, 5. April 2008 00:40:35 schrieb Stefan Schweizer:
> On Fri, Apr 4, 2008 at 1:36 PM, Oliver Neukum <oliver@neukum.org> wrote:
> > Am Freitag, 4. April 2008 11:20:51 schrieb Stefan Schweizer:
> >
> > > Yeah, I tested it with the combined patch. How can I test if
> >  > autosuspend works? Seems to work fine so far but does not write in my
> >  > logfile. No problems found when testing.
> >
> >  Please compile your kernel with CONFIG_PM_DEBUG and follow the
> >  instructions in Documentation/usb. You should see something in the log.
> 
> there is still no information in dmesg when I use the device. Do I
> need more debugging maybe?

Ok, please locate the directory for your touchpad in sysfs and post all
files in the power subdirectory.

	Regards
		Oliver

Re: suspend

[Oliver Neukum]

Am Samstag, 5. April 2008 11:15:55 schrieb Stefan Schweizer:
> The kernel documentation says that "auto" is default for level. Why is
> it "on" here? Simple startup line to make it right:

Which kernel version are you using? In modern kernels the default is "on".

	Regards
		Oliver

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Re: suspend

[Stefan Schweizer]

On Sat, Apr 5, 2008 at 10:00 AM, Oliver Neukum <oliver@neukum.org> wrote:
>  Ok, please locate the directory for your touchpad in sysfs and post all
>  files in the power subdirectory.

The kernel documentation says that "auto" is default for level. Why is
it "on" here? Simple startup line to make it right:

        for i in $(find /sys | grep power/level); do echo auto > "$i"; done

But still no extra info in dmesg :(

# ls /sys/devices/pci0000:00/0000:00:1d.0/usb2/2-2/power/
autosuspend  level  persist  wakeup


power # for i in *; do echo $i: $(<$i); done
autosuspend: 2
level: on
persist: 1
wakeup: enabled


2-2 #  for i in *; do echo $i: $(<$i); done
2-2:1.0:
2-2:1.1:
2-2:1.2:
authorized: 1
bcdDevice: 0064
bConfigurationValue: 1
bDeviceClass: 00
bDeviceProtocol: 00
bDeviceSubClass: 00
bmAttributes: a0
bMaxPacketSize0: 8
bMaxPower: 40mA
bNumConfigurations: 1
bNumInterfaces: 3
busnum: 2
configuration:
"  !"Y�  !"��▒d T�  !
dev: 189:136
devnum: 9
driver:
ep_00:
idProduct: 0218
idVendor: 05ac
manufacturer: Apple Computer
maxchild: 0
power:
product: Apple Internal Keyboard / Trackpad
quirks: 0x0
speed: 12
subsystem:
uevent: MAJOR=189 MINOR=136 DEVTYPE=usb_device DRIVER=usb
DEVICE=/proc/bus/usb/002/009 PRODUCT=5ac/218/64 TYPE=0/0/0 BUSNUM=002
DEVNUM=009
urbnum: 3615
usb_endpoint:
version: 2.00

Regards,
Stefan

Re: suspend

[Alan Stern]

On Sat, 5 Apr 2008, Oliver Neukum wrote:

> Am Samstag, 5. April 2008 00:40:35 schrieb Stefan Schweizer:
> > On Fri, Apr 4, 2008 at 1:36 PM, Oliver Neukum <oliver@neukum.org> wrote:
> > > Am Freitag, 4. April 2008 11:20:51 schrieb Stefan Schweizer:
> > >
> > > > Yeah, I tested it with the combined patch. How can I test if
> > >  > autosuspend works? Seems to work fine so far but does not write in my
> > >  > logfile. No problems found when testing.
> > >
> > >  Please compile your kernel with CONFIG_PM_DEBUG and follow the
> > >  instructions in Documentation/usb. You should see something in the log.

Note that CONFIG_PM_DEBUG has nothing to do with autosuspend.  You 
shouldn't expect to see anything unless you set CONFIG_USB_DEBUG.

> > there is still no information in dmesg when I use the device. Do I
> > need more debugging maybe?
> 
> Ok, please locate the directory for your touchpad in sysfs and post all
> files in the power subdirectory.

Alan Stern