1 files changed, 182 insertions, 125 deletions

diff --git a/drivers/usb/misc/usblcd.c b/drivers/usb/misc/usblcd.c
index 85f3725334b..1184390508e 100644
--- a/drivers/usb/misc/usblcd.c
+++ b/drivers/usb/misc/usblcd.c
@@ -14,10 +14,10 @@
  *****************************************************************************/
 #include <linux/module.h>
 #include <linux/kernel.h>
-#include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/errno.h>
-#include <asm/uaccess.h>
+#include <linux/mutex.h>
+#include <linux/uaccess.h>
 #include <linux/usb.h>
 
 #define DRIVER_VERSION "USBLCD Driver Version 1.05"
@@ -28,24 +28,39 @@
 #define IOCTL_GET_DRV_VERSION	2
 
 
-static struct usb_device_id id_table [] = {
+static DEFINE_MUTEX(lcd_mutex);
+static const struct usb_device_id id_table[] = {
 	{ .idVendor = 0x10D2, .match_flags = USB_DEVICE_ID_MATCH_VENDOR, },
 	{ },
 };
-MODULE_DEVICE_TABLE (usb, id_table);
+MODULE_DEVICE_TABLE(usb, id_table);
+
+static DEFINE_MUTEX(open_disc_mutex);
 
 
 struct usb_lcd {
-	struct usb_device *	udev;			/* init: probe_lcd */
-	struct usb_interface *  interface;		/* the interface for this device */
-	unsigned char *         bulk_in_buffer;		/* the buffer to receive data */
-	size_t			bulk_in_size;		/* the size of the receive buffer */
-	__u8			bulk_in_endpointAddr;	/* the address of the bulk in endpoint */
-	__u8			bulk_out_endpointAddr;	/* the address of the bulk out endpoint */
-	struct kref             kref;
+	struct usb_device	*udev;			/* init: probe_lcd */
+	struct usb_interface	*interface;		/* the interface for
+							   this device */
+	unsigned char		*bulk_in_buffer;	/* the buffer to receive
+							   data */
+	size_t			bulk_in_size;		/* the size of the
+							   receive buffer */
+	__u8			bulk_in_endpointAddr;	/* the address of the
+							   bulk in endpoint */
+	__u8			bulk_out_endpointAddr;	/* the address of the
+							   bulk out endpoint */
+	struct kref		kref;
+	struct semaphore	limit_sem;		/* to stop writes at
+							   full throttle from
+							   using up all RAM */
+	struct usb_anchor	submitted;		/* URBs to wait for
+							   before suspend */
 };
 #define to_lcd_dev(d) container_of(d, struct usb_lcd, kref)
 
+#define USB_LCD_CONCURRENT_WRITES	5
+
 static struct usb_driver lcd_driver;
 
 
@@ -54,8 +69,8 @@ static void lcd_delete(struct kref *kref)
 	struct usb_lcd *dev = to_lcd_dev(kref);
 
 	usb_put_dev(dev->udev);
-	kfree (dev->bulk_in_buffer);
-	kfree (dev);
+	kfree(dev->bulk_in_buffer);
+	kfree(dev);
 }
 
 
@@ -63,59 +78,73 @@ static int lcd_open(struct inode *inode, struct file *file)
 {
 	struct usb_lcd *dev;
 	struct usb_interface *interface;
-	int subminor;
-	int retval = 0;
+	int subminor, r;
 
+	mutex_lock(&lcd_mutex);
 	subminor = iminor(inode);
 
 	interface = usb_find_interface(&lcd_driver, subminor);
 	if (!interface) {
-		err ("USBLCD: %s - error, can't find device for minor %d",
-		     __FUNCTION__, subminor);
-		retval = -ENODEV;
-		goto exit;
+		mutex_unlock(&lcd_mutex);
+		printk(KERN_ERR "USBLCD: %s - error, can't find device for minor %d\n",
+		       __func__, subminor);
+		return -ENODEV;
 	}
 
+	mutex_lock(&open_disc_mutex);
 	dev = usb_get_intfdata(interface);
 	if (!dev) {
-		retval = -ENODEV;
-		goto exit;
+		mutex_unlock(&open_disc_mutex);
+		mutex_unlock(&lcd_mutex);
+		return -ENODEV;
 	}
 
 	/* increment our usage count for the device */
 	kref_get(&dev->kref);
+	mutex_unlock(&open_disc_mutex);
+
+	/* grab a power reference */
+	r = usb_autopm_get_interface(interface);
+	if (r < 0) {
+		kref_put(&dev->kref, lcd_delete);
+		mutex_unlock(&lcd_mutex);
+		return r;
+	}
 
 	/* save our object in the file's private structure */
 	file->private_data = dev;
+	mutex_unlock(&lcd_mutex);
 
-exit:
-	return retval;
+	return 0;
 }
 
 static int lcd_release(struct inode *inode, struct file *file)
 {
 	struct usb_lcd *dev;
 
-	dev = (struct usb_lcd *)file->private_data;
+	dev = file->private_data;
 	if (dev == NULL)
 		return -ENODEV;
 
 	/* decrement the count on our device */
+	usb_autopm_put_interface(dev->interface);
 	kref_put(&dev->kref, lcd_delete);
 	return 0;
 }
 
-static ssize_t lcd_read(struct file *file, char __user * buffer, size_t count, loff_t *ppos)
+static ssize_t lcd_read(struct file *file, char __user * buffer,
+			size_t count, loff_t *ppos)
 {
 	struct usb_lcd *dev;
 	int retval = 0;
 	int bytes_read;
 
-	dev = (struct usb_lcd *)file->private_data;
+	dev = file->private_data;
 
 	/* do a blocking bulk read to get data from the device */
-	retval = usb_bulk_msg(dev->udev, 
-			      usb_rcvbulkpipe(dev->udev, dev->bulk_in_endpointAddr),
+	retval = usb_bulk_msg(dev->udev,
+			      usb_rcvbulkpipe(dev->udev,
+					      dev->bulk_in_endpointAddr),
 			      dev->bulk_in_buffer,
 			      min(dev->bulk_in_size, count),
 			      &bytes_read, 10000);
@@ -131,30 +160,32 @@ static ssize_t lcd_read(struct file *file, char __user * buffer, size_t count, l
 	return retval;
 }
 
-static int lcd_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+static long lcd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
 	struct usb_lcd *dev;
 	u16 bcdDevice;
 	char buf[30];
 
-	dev = (struct usb_lcd *)file->private_data;
+	dev = file->private_data;
 	if (dev == NULL)
 		return -ENODEV;
-	
+
 	switch (cmd) {
 	case IOCTL_GET_HARD_VERSION:
+		mutex_lock(&lcd_mutex);
 		bcdDevice = le16_to_cpu((dev->udev)->descriptor.bcdDevice);
-		sprintf(buf,"%1d%1d.%1d%1d",
+		sprintf(buf, "%1d%1d.%1d%1d",
 			(bcdDevice & 0xF000)>>12,
 			(bcdDevice & 0xF00)>>8,
 			(bcdDevice & 0xF0)>>4,
 			(bcdDevice & 0xF));
-		if (copy_to_user((void __user *)arg,buf,strlen(buf))!=0)
+		mutex_unlock(&lcd_mutex);
+		if (copy_to_user((void __user *)arg, buf, strlen(buf)) != 0)
 			return -EFAULT;
 		break;
 	case IOCTL_GET_DRV_VERSION:
-		sprintf(buf,DRIVER_VERSION);
-		if (copy_to_user((void __user *)arg,buf,strlen(buf))!=0)
+		sprintf(buf, DRIVER_VERSION);
+		if (copy_to_user((void __user *)arg, buf, strlen(buf)) != 0)
 			return -EFAULT;
 		break;
 	default:
@@ -165,89 +196,107 @@ static int lcd_ioctl(struct inode *inode, struct file *file, unsigned int cmd, u
 	return 0;
 }
 
-static void lcd_write_bulk_callback(struct urb *urb, struct pt_regs *regs)
+static void lcd_write_bulk_callback(struct urb *urb)
 {
 	struct usb_lcd *dev;
+	int status = urb->status;
 
-	dev = (struct usb_lcd *)urb->context;
+	dev = urb->context;
 
 	/* sync/async unlink faults aren't errors */
-	if (urb->status &&
-	    !(urb->status == -ENOENT ||
-	      urb->status == -ECONNRESET ||
-              urb->status == -ESHUTDOWN)) {
-		dbg("USBLCD: %s - nonzero write bulk status received: %d",
-		    __FUNCTION__, urb->status);
+	if (status &&
+	    !(status == -ENOENT ||
+	      status == -ECONNRESET ||
+	      status == -ESHUTDOWN)) {
+		dev_dbg(&dev->interface->dev,
+			"nonzero write bulk status received: %d\n", status);
 	}
 
 	/* free up our allocated buffer */
-	usb_buffer_free(urb->dev, urb->transfer_buffer_length,
-			urb->transfer_buffer, urb->transfer_dma);
+	usb_free_coherent(urb->dev, urb->transfer_buffer_length,
+			  urb->transfer_buffer, urb->transfer_dma);
+	up(&dev->limit_sem);
 }
 
-static ssize_t lcd_write(struct file *file, const char __user * user_buffer, size_t count, loff_t *ppos)
+static ssize_t lcd_write(struct file *file, const char __user * user_buffer,
+			 size_t count, loff_t *ppos)
 {
 	struct usb_lcd *dev;
-        int retval = 0;
+	int retval = 0, r;
 	struct urb *urb = NULL;
 	char *buf = NULL;
-	
-	dev = (struct usb_lcd *)file->private_data;
-	
+
+	dev = file->private_data;
+
 	/* verify that we actually have some data to write */
 	if (count == 0)
 		goto exit;
 
+	r = down_interruptible(&dev->limit_sem);
+	if (r < 0)
+		return -EINTR;
+
 	/* create a urb, and a buffer for it, and copy the data to the urb */
 	urb = usb_alloc_urb(0, GFP_KERNEL);
 	if (!urb) {
 		retval = -ENOMEM;
-		goto error;
+		goto err_no_buf;
 	}
-	
-	buf = usb_buffer_alloc(dev->udev, count, GFP_KERNEL, &urb->transfer_dma);
+
+	buf = usb_alloc_coherent(dev->udev, count, GFP_KERNEL,
+				 &urb->transfer_dma);
 	if (!buf) {
 		retval = -ENOMEM;
 		goto error;
 	}
-	
+
 	if (copy_from_user(buf, user_buffer, count)) {
 		retval = -EFAULT;
 		goto error;
 	}
-	
+
 	/* initialize the urb properly */
 	usb_fill_bulk_urb(urb, dev->udev,
-			  usb_sndbulkpipe(dev->udev, dev->bulk_out_endpointAddr),
+			  usb_sndbulkpipe(dev->udev,
+			  dev->bulk_out_endpointAddr),
 			  buf, count, lcd_write_bulk_callback, dev);
 	urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
-	
+
+	usb_anchor_urb(urb, &dev->submitted);
+
 	/* send the data out the bulk port */
 	retval = usb_submit_urb(urb, GFP_KERNEL);
 	if (retval) {
-		err("USBLCD: %s - failed submitting write urb, error %d", __FUNCTION__, retval);
-		goto error;
+		dev_err(&dev->udev->dev,
+			"%s - failed submitting write urb, error %d\n",
+			__func__, retval);
+		goto error_unanchor;
 	}
-	
-	/* release our reference to this urb, the USB core will eventually free it entirely */
+
+	/* release our reference to this urb,
+	   the USB core will eventually free it entirely */
 	usb_free_urb(urb);
 
 exit:
 	return count;
-
+error_unanchor:
+	usb_unanchor_urb(urb);
 error:
-	usb_buffer_free(dev->udev, count, buf, urb->transfer_dma);
+	usb_free_coherent(dev->udev, count, buf, urb->transfer_dma);
 	usb_free_urb(urb);
+err_no_buf:
+	up(&dev->limit_sem);
 	return retval;
 }
 
-static struct file_operations lcd_fops = {
-        .owner =        THIS_MODULE,
-        .read =         lcd_read,
-        .write =        lcd_write,
-        .open =         lcd_open,
-	.ioctl =        lcd_ioctl,
-        .release =      lcd_release,
+static const struct file_operations lcd_fops = {
+	.owner =        THIS_MODULE,
+	.read =         lcd_read,
+	.write =        lcd_write,
+	.open =         lcd_open,
+	.unlocked_ioctl = lcd_ioctl,
+	.release =      lcd_release,
+	.llseek =	 noop_llseek,
 };
 
 /*
@@ -255,12 +304,13 @@ static struct file_operations lcd_fops = {
  * and to have the device registered with the driver core
  */
 static struct usb_class_driver lcd_class = {
-        .name =         "lcd%d",
-        .fops =         &lcd_fops,
-        .minor_base =   USBLCD_MINOR,
+	.name =         "lcd%d",
+	.fops =         &lcd_fops,
+	.minor_base =   USBLCD_MINOR,
 };
 
-static int lcd_probe(struct usb_interface *interface, const struct usb_device_id *id)
+static int lcd_probe(struct usb_interface *interface,
+		     const struct usb_device_id *id)
 {
 	struct usb_lcd *dev = NULL;
 	struct usb_host_interface *iface_desc;
@@ -270,22 +320,24 @@ static int lcd_probe(struct usb_interface *interface, const struct usb_device_id
 	int retval = -ENOMEM;
 
 	/* allocate memory for our device state and initialize it */
-	dev = kmalloc(sizeof(*dev), GFP_KERNEL);
+	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 	if (dev == NULL) {
-		err("Out of memory");
+		dev_err(&interface->dev, "Out of memory\n");
 		goto error;
 	}
-	memset(dev, 0x00, sizeof(*dev));
 	kref_init(&dev->kref);
+	sema_init(&dev->limit_sem, USB_LCD_CONCURRENT_WRITES);
+	init_usb_anchor(&dev->submitted);
 
 	dev->udev = usb_get_dev(interface_to_usbdev(interface));
 	dev->interface = interface;
 
 	if (le16_to_cpu(dev->udev->descriptor.idProduct) != 0x0001) {
-		warn(KERN_INFO "USBLCD model not supported.");
-		return -ENODEV;
+		dev_warn(&interface->dev, "USBLCD model not supported.\n");
+		retval = -ENODEV;
+		goto error;
 	}
-	
+
 	/* set up the endpoint information */
 	/* use only the first bulk-in and bulk-out endpoints */
 	iface_desc = interface->cur_altsetting;
@@ -293,30 +345,28 @@ static int lcd_probe(struct usb_interface *interface, const struct usb_device_id
 		endpoint = &iface_desc->endpoint[i].desc;
 
 		if (!dev->bulk_in_endpointAddr &&
-		    (endpoint->bEndpointAddress & USB_DIR_IN) &&
-		    ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
-					== USB_ENDPOINT_XFER_BULK)) {
+		    usb_endpoint_is_bulk_in(endpoint)) {
 			/* we found a bulk in endpoint */
-			buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
+			buffer_size = usb_endpoint_maxp(endpoint);
 			dev->bulk_in_size = buffer_size;
 			dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
 			dev->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
 			if (!dev->bulk_in_buffer) {
-				err("Could not allocate bulk_in_buffer");
+				dev_err(&interface->dev,
+					"Could not allocate bulk_in_buffer\n");
 				goto error;
 			}
 		}
 
 		if (!dev->bulk_out_endpointAddr &&
-		    !(endpoint->bEndpointAddress & USB_DIR_IN) &&
-		    ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
-					== USB_ENDPOINT_XFER_BULK)) {
+		    usb_endpoint_is_bulk_out(endpoint)) {
 			/* we found a bulk out endpoint */
 			dev->bulk_out_endpointAddr = endpoint->bEndpointAddress;
 		}
 	}
 	if (!(dev->bulk_in_endpointAddr && dev->bulk_out_endpointAddr)) {
-		err("Could not find both bulk-in and bulk-out endpoints");
+		dev_err(&interface->dev,
+			"Could not find both bulk-in and bulk-out endpoints\n");
 		goto error;
 	}
 
@@ -327,19 +377,21 @@ static int lcd_probe(struct usb_interface *interface, const struct usb_device_id
 	retval = usb_register_dev(interface, &lcd_class);
 	if (retval) {
 		/* something prevented us from registering this driver */
-		err("Not able to get a minor for this device.");
+		dev_err(&interface->dev,
+			"Not able to get a minor for this device.\n");
 		usb_set_intfdata(interface, NULL);
 		goto error;
 	}
 
 	i = le16_to_cpu(dev->udev->descriptor.bcdDevice);
 
-	info("USBLCD Version %1d%1d.%1d%1d found at address %d",
-		(i & 0xF000)>>12,(i & 0xF00)>>8,(i & 0xF0)>>4,(i & 0xF),
-		dev->udev->devnum);
+	dev_info(&interface->dev, "USBLCD Version %1d%1d.%1d%1d found "
+		 "at address %d\n", (i & 0xF000)>>12, (i & 0xF00)>>8,
+		 (i & 0xF0)>>4, (i & 0xF), dev->udev->devnum);
 
 	/* let the user know what node this device is now attached to */
-	info("USB LCD device now attached to USBLCD-%d", interface->minor);
+	dev_info(&interface->dev, "USB LCD device now attached to USBLCD-%d\n",
+		 interface->minor);
 	return 0;
 
 error:
@@ -348,55 +400,60 @@ error:
 	return retval;
 }
 
+static void lcd_draw_down(struct usb_lcd *dev)
+{
+	int time;
+
+	time = usb_wait_anchor_empty_timeout(&dev->submitted, 1000);
+	if (!time)
+		usb_kill_anchored_urbs(&dev->submitted);
+}
+
+static int lcd_suspend(struct usb_interface *intf, pm_message_t message)
+{
+	struct usb_lcd *dev = usb_get_intfdata(intf);
+
+	if (!dev)
+		return 0;
+	lcd_draw_down(dev);
+	return 0;
+}
+
+static int lcd_resume(struct usb_interface *intf)
+{
+	return 0;
+}
+
 static void lcd_disconnect(struct usb_interface *interface)
 {
 	struct usb_lcd *dev;
-        int minor = interface->minor;
-
-        /* prevent skel_open() from racing skel_disconnect() */
-        lock_kernel();
+	int minor = interface->minor;
 
-        dev = usb_get_intfdata(interface);
-        usb_set_intfdata(interface, NULL);
+	mutex_lock(&open_disc_mutex);
+	dev = usb_get_intfdata(interface);
+	usb_set_intfdata(interface, NULL);
+	mutex_unlock(&open_disc_mutex);
 
-        /* give back our minor */
-        usb_deregister_dev(interface, &lcd_class);
- 
-	unlock_kernel();
+	/* give back our minor */
+	usb_deregister_dev(interface, &lcd_class);
 
 	/* decrement our usage count */
 	kref_put(&dev->kref, lcd_delete);
 
-	info("USB LCD #%d now disconnected", minor);
+	dev_info(&interface->dev, "USB LCD #%d now disconnected\n", minor);
 }
 
 static struct usb_driver lcd_driver = {
-	.owner =	THIS_MODULE,
 	.name =		"usblcd",
 	.probe =	lcd_probe,
 	.disconnect =	lcd_disconnect,
+	.suspend =	lcd_suspend,
+	.resume =	lcd_resume,
 	.id_table =	id_table,
+	.supports_autosuspend = 1,
 };
 
-static int __init usb_lcd_init(void)
-{
-	int result;
-	
-	result = usb_register(&lcd_driver);
-	if (result)
-		err("usb_register failed. Error number %d", result);
-
-	return result;
-}
-
-
-static void __exit usb_lcd_exit(void)
-{
-	usb_deregister(&lcd_driver);
-}
-
-module_init(usb_lcd_init);
-module_exit(usb_lcd_exit);
+module_usb_driver(lcd_driver);
 
 MODULE_AUTHOR("Georges Toth <g.toth@e-biz.lu>");
 MODULE_DESCRIPTION(DRIVER_VERSION);