[PATCH]suspend/resume for cdc_acm

Hi,

this patch implements suspend() and resume() methods for CDC ACM devices.

	Regards
		Oliver

Signed-off-by: Oliver Neukum <[email protected]>

----

--- linux-2.6.23-rc9/drivers/usb/class/cdc-acm.h	2007-07-09 01:32:17.000000000 +0200
+++ acm/drivers/usb/class/cdc-acm.h	2007-10-08 11:20:39.000000000 +0200
@@ -120,6 +120,7 @@ struct acm {
 	unsigned char throttle;				/* throttled by tty layer */
 	unsigned char clocal;				/* termios CLOCAL */
 	unsigned int ctrl_caps;				/* control capabilities from the class specific header */
+	unsigned int susp_count;			/* number of suspended interfaces */
 };
 
 #define CDC_DATA_INTERFACE_TYPE	0x0a
--- linux-2.6.23-rc9/drivers/usb/class/cdc-acm.c	2007-10-10 10:28:50.000000000 +0200
+++ acm/drivers/usb/class/cdc-acm.c	2007-10-08 11:20:55.000000000 +0200
@@ -1096,6 +1096,25 @@ alloc_fail:
 	return -ENOMEM;
 }
 
+static void stop_data_traffic(struct acm *acm)
+{
+	int i;
+
+	tasklet_disable(&acm->urb_task);
+
+	usb_kill_urb(acm->ctrlurb);
+	usb_kill_urb(acm->writeurb);
+	for (i = 0; i < acm->rx_buflimit; i++)
+		usb_kill_urb(acm->ru[i].urb);
+
+	INIT_LIST_HEAD(&acm->filled_read_bufs);
+	INIT_LIST_HEAD(&acm->spare_read_bufs);
+
+	tasklet_enable(&acm->urb_task);
+
+	flush_scheduled_work(); /* wait for acm_softint */
+}
+
 static void acm_disconnect(struct usb_interface *intf)
 {
 	struct acm *acm = usb_get_intfdata(intf);
@@ -1123,19 +1142,7 @@ static void acm_disconnect(struct usb_in
 	usb_set_intfdata(acm->control, NULL);
 	usb_set_intfdata(acm->data, NULL);
 
-	tasklet_disable(&acm->urb_task);
-
-	usb_kill_urb(acm->ctrlurb);
-	usb_kill_urb(acm->writeurb);
-	for (i = 0; i < acm->rx_buflimit; i++)
-		usb_kill_urb(acm->ru[i].urb);
-
-	INIT_LIST_HEAD(&acm->filled_read_bufs);
-	INIT_LIST_HEAD(&acm->spare_read_bufs);
-
-	tasklet_enable(&acm->urb_task);
-
-	flush_scheduled_work(); /* wait for acm_softint */
+	stop_data_traffic(acm);
 
 	acm_write_buffers_free(acm);
 	usb_buffer_free(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
@@ -1156,6 +1163,46 @@ static void acm_disconnect(struct usb_in
 		tty_hangup(acm->tty);
 }
 
+static int acm_suspend(struct usb_interface *intf, pm_message_t message)
+{
+	struct acm *acm = usb_get_intfdata(intf);
+
+	if (acm->susp_count++)
+		return 0;
+	/*
+	we treat opened interface differently,
+	we must giard against open
+	*/
+	mutex_lock(&open_mutex);
+
+	if (acm->used)
+		stop_data_traffic(acm);
+
+	mutex_unlock(&open_mutex);
+	return 0;
+}
+
+static int acm_resume(struct usb_interface *intf)
+{
+	struct acm *acm = usb_get_intfdata(intf);
+	int rv = 0;
+
+	if (--acm->susp_count)
+		return 0;
+
+	mutex_lock(&open_mutex);
+	if (acm->used) {
+		rv = usb_submit_urb(acm->ctrlurb, GFP_NOIO);
+		if (rv < 0)
+		goto err_out;
+
+		tasklet_schedule(&acm->urb_task);
+	}
+
+err_out:
+	mutex_unlock(&open_mutex);
+	return rv;
+}
 /*
  * USB driver structure.
  */
@@ -1208,6 +1255,8 @@ static struct usb_driver acm_driver = {
 	.name =		"cdc_acm",
 	.probe =	acm_probe,
 	.disconnect =	acm_disconnect,
+	.suspend =	acm_suspend,
+	.resume =	acm_resume,
 	.id_table =	acm_ids,
 };
 

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