Initial import

1 files changed, 460 insertions, 0 deletions

diff --git a/drivers/usb/misc/usblcd.c b/drivers/usb/misc/usblcd.c
new file mode 100644
index 000000000..118439050
--- /dev/null
+++ b/drivers/usb/misc/usblcd.c
@@ -0,0 +1,460 @@
+/*****************************************************************************
+ *                          USBLCD Kernel Driver                             *
+ *                            Version 1.05                                   *
+ *             (C) 2005 Georges Toth <g.toth@e-biz.lu>                       *
+ *                                                                           *
+ *     This file is licensed under the GPL. See COPYING in the package.      *
+ * Based on usb-skeleton.c 2.0 by Greg Kroah-Hartman (greg@kroah.com)        *
+ *                                                                           *
+ *                                                                           *
+ * 28.02.05 Complete rewrite of the original usblcd.c driver,                *
+ *          based on usb_skeleton.c.                                         *
+ *          This new driver allows more than one USB-LCD to be connected     *
+ *          and controlled, at once                                          *
+ *****************************************************************************/
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/mutex.h>
+#include <linux/uaccess.h>
+#include <linux/usb.h>
+
+#define DRIVER_VERSION "USBLCD Driver Version 1.05"
+
+#define USBLCD_MINOR		144
+
+#define IOCTL_GET_HARD_VERSION	1
+#define IOCTL_GET_DRV_VERSION	2
+
+
+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);
+
+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 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;
+
+
+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);
+}
+
+
+static int lcd_open(struct inode *inode, struct file *file)
+{
+	struct usb_lcd *dev;
+	struct usb_interface *interface;
+	int subminor, r;
+
+	mutex_lock(&lcd_mutex);
+	subminor = iminor(inode);
+
+	interface = usb_find_interface(&lcd_driver, subminor);
+	if (!interface) {
+		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) {
+		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);
+
+	return 0;
+}
+
+static int lcd_release(struct inode *inode, struct file *file)
+{
+	struct usb_lcd *dev;
+
+	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)
+{
+	struct usb_lcd *dev;
+	int retval = 0;
+	int bytes_read;
+
+	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),
+			      dev->bulk_in_buffer,
+			      min(dev->bulk_in_size, count),
+			      &bytes_read, 10000);
+
+	/* if the read was successful, copy the data to userspace */
+	if (!retval) {
+		if (copy_to_user(buffer, dev->bulk_in_buffer, bytes_read))
+			retval = -EFAULT;
+		else
+			retval = bytes_read;
+	}
+
+	return retval;
+}
+
+static long lcd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	struct usb_lcd *dev;
+	u16 bcdDevice;
+	char buf[30];
+
+	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",
+			(bcdDevice & 0xF000)>>12,
+			(bcdDevice & 0xF00)>>8,
+			(bcdDevice & 0xF0)>>4,
+			(bcdDevice & 0xF));
+		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)
+			return -EFAULT;
+		break;
+	default:
+		return -ENOTTY;
+		break;
+	}
+
+	return 0;
+}
+
+static void lcd_write_bulk_callback(struct urb *urb)
+{
+	struct usb_lcd *dev;
+	int status = urb->status;
+
+	dev = urb->context;
+
+	/* sync/async unlink faults aren't errors */
+	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_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)
+{
+	struct usb_lcd *dev;
+	int retval = 0, r;
+	struct urb *urb = NULL;
+	char *buf = NULL;
+
+	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 err_no_buf;
+	}
+
+	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),
+			  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) {
+		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 */
+	usb_free_urb(urb);
+
+exit:
+	return count;
+error_unanchor:
+	usb_unanchor_urb(urb);
+error:
+	usb_free_coherent(dev->udev, count, buf, urb->transfer_dma);
+	usb_free_urb(urb);
+err_no_buf:
+	up(&dev->limit_sem);
+	return retval;
+}
+
+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,
+};
+
+/*
+ * usb class driver info in order to get a minor number from the usb core,
+ * 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,
+};
+
+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;
+	struct usb_endpoint_descriptor *endpoint;
+	size_t buffer_size;
+	int i;
+	int retval = -ENOMEM;
+
+	/* allocate memory for our device state and initialize it */
+	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+	if (dev == NULL) {
+		dev_err(&interface->dev, "Out of memory\n");
+		goto error;
+	}
+	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) {
+		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;
+	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
+		endpoint = &iface_desc->endpoint[i].desc;
+
+		if (!dev->bulk_in_endpointAddr &&
+		    usb_endpoint_is_bulk_in(endpoint)) {
+			/* we found a bulk in endpoint */
+			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) {
+				dev_err(&interface->dev,
+					"Could not allocate bulk_in_buffer\n");
+				goto error;
+			}
+		}
+
+		if (!dev->bulk_out_endpointAddr &&
+		    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)) {
+		dev_err(&interface->dev,
+			"Could not find both bulk-in and bulk-out endpoints\n");
+		goto error;
+	}
+
+	/* save our data pointer in this interface device */
+	usb_set_intfdata(interface, dev);
+
+	/* we can register the device now, as it is ready */
+	retval = usb_register_dev(interface, &lcd_class);
+	if (retval) {
+		/* something prevented us from registering this driver */
+		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);
+
+	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 */
+	dev_info(&interface->dev, "USB LCD device now attached to USBLCD-%d\n",
+		 interface->minor);
+	return 0;
+
+error:
+	if (dev)
+		kref_put(&dev->kref, lcd_delete);
+	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;
+
+	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);
+
+	/* decrement our usage count */
+	kref_put(&dev->kref, lcd_delete);
+
+	dev_info(&interface->dev, "USB LCD #%d now disconnected\n", minor);
+}
+
+static struct usb_driver lcd_driver = {
+	.name =		"usblcd",
+	.probe =	lcd_probe,
+	.disconnect =	lcd_disconnect,
+	.suspend =	lcd_suspend,
+	.resume =	lcd_resume,
+	.id_table =	id_table,
+	.supports_autosuspend = 1,
+};
+
+module_usb_driver(lcd_driver);
+
+MODULE_AUTHOR("Georges Toth <g.toth@e-biz.lu>");
+MODULE_DESCRIPTION(DRIVER_VERSION);
+MODULE_LICENSE("GPL");