patch-2.4.20 linux-2.4.20/drivers/usb/usblcd.c

• Lines: 348
• Date: Thu Nov 28 15:53:15 2002
• Orig file: linux-2.4.19/drivers/usb/usblcd.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.19/drivers/usb/usblcd.c linux-2.4.20/drivers/usb/usblcd.c
@@ -0,0 +1,347 @@
+/***************************************************************************** 
+ *                          USBLCD Kernel Driver                             *
+ *        See http://www.usblcd.de for Hardware and Documentation.           *
+ *                            Version 1.03                                   *
+ *             (C) 2002 Adams IT Services <info@usblcd.de>                   *
+ *                                                                           *
+ *     This file is licensed under the GPL. See COPYING in the package.      *
+ * Based on rio500.c by Cesar Miquel (miquel@df.uba.ar) which is based on    *
+ * hp_scanner.c by David E. Nelson (dnelson@jump.net)                        *
+ *                                                                           *
+ * 23.7.02 RA changed minor device number to the official assigned one       *
+ * 18.9.02 RA Vendor ID change, longer timeouts                              *
+ *****************************************************************************/
+#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/usb.h>
+
+#define DRIVER_VERSION "USBLCD Driver Version 1.03"
+
+#define USBLCD_MINOR		144
+
+#define IOCTL_GET_HARD_VERSION	1
+#define IOCTL_GET_DRV_VERSION	2
+
+/* stall/wait timeout for USBLCD */
+#define NAK_TIMEOUT	(10*HZ)
+
+#define IBUF_SIZE	0x1000
+#define OBUF_SIZE	0x10000
+
+struct lcd_usb_data {
+	struct usb_device *lcd_dev;	/* init: probe_lcd */
+	unsigned int ifnum;		/* Interface number of the USB device */
+	int isopen;			/* nz if open */
+	int present;			/* Device is present on the bus */
+	char *obuf, *ibuf;		/* transfer buffers */
+	char bulk_in_ep, bulk_out_ep;	/* Endpoint assignments */
+	wait_queue_head_t wait_q;	/* for timeouts */
+};
+
+static struct lcd_usb_data lcd_instance;
+
+static int open_lcd(struct inode *inode, struct file *file)
+{
+	struct lcd_usb_data *lcd = &lcd_instance;
+
+	if (lcd->isopen || !lcd->present) {
+		return -EBUSY;
+	}
+	lcd->isopen = 1;
+
+	init_waitqueue_head(&lcd->wait_q);
+
+	info("USBLCD opened.");
+
+	return 0;
+}
+
+static int close_lcd(struct inode *inode, struct file *file)
+{
+	struct lcd_usb_data *lcd = &lcd_instance;
+
+	lcd->isopen = 0;
+
+	info("USBLCD closed.");
+	return 0;
+}
+
+static int
+ioctl_lcd(struct inode *inode, struct file *file, unsigned int cmd,
+	  unsigned long arg)
+{
+	struct lcd_usb_data *lcd = &lcd_instance;
+	int i;
+	char buf[30];
+
+	/* Sanity check to make sure lcd is connected, powered, etc */
+	if (lcd == NULL ||
+	    lcd->present == 0 ||
+	    lcd->lcd_dev == NULL)
+		return -1;
+
+	switch (cmd) {
+	case IOCTL_GET_HARD_VERSION:
+		i = (lcd->lcd_dev)->descriptor.bcdDevice;
+		sprintf(buf,"%1d%1d.%1d%1d",(i & 0xF000)>>12,(i & 0xF00)>>8,
+			(i & 0xF0)>>4,(i & 0xF));
+		if (copy_to_user((void *)arg,buf,strlen(buf))!=0)
+			return -EFAULT;
+		break;
+	case IOCTL_GET_DRV_VERSION:
+		sprintf(buf,DRIVER_VERSION);
+		if (copy_to_user((void *)arg,buf,strlen(buf))!=0)
+			return -EFAULT;
+		break;
+	default:
+		return -ENOIOCTLCMD;
+		break;
+	}
+
+	return 0;
+}
+
+static ssize_t
+write_lcd(struct file *file, const char *buffer,
+	  size_t count, loff_t * ppos)
+{
+	struct lcd_usb_data *lcd = &lcd_instance;
+
+	unsigned long copy_size;
+	unsigned long bytes_written = 0;
+	unsigned int partial;
+
+	int result = 0;
+	int maxretry;
+
+	/* Sanity check to make sure lcd is connected, powered, etc */
+	if (lcd == NULL ||
+	    lcd->present == 0 ||
+	    lcd->lcd_dev == NULL)
+		return -1;
+
+	do {
+		unsigned long thistime;
+		char *obuf = lcd->obuf;
+
+		thistime = copy_size =
+		    (count >= OBUF_SIZE) ? OBUF_SIZE : count;
+		if (copy_from_user(lcd->obuf, buffer, copy_size))
+			return -EFAULT;
+		maxretry = 5;
+		while (thistime) {
+			if (!lcd->lcd_dev)
+				return -ENODEV;
+			if (signal_pending(current)) {
+				return bytes_written ? bytes_written : -EINTR;
+			}
+
+			result = usb_bulk_msg(lcd->lcd_dev,
+					 usb_sndbulkpipe(lcd->lcd_dev, 1),
+					 obuf, thistime, &partial, 10 * HZ);
+
+			dbg("write stats: result:%d thistime:%lu partial:%u",
+			     result, thistime, partial);
+
+			if (result == USB_ST_TIMEOUT) {	/* NAK - so hold for a while */
+				if (!maxretry--) {
+					return -ETIME;
+				}
+				interruptible_sleep_on_timeout(&lcd-> wait_q, NAK_TIMEOUT);
+				continue;
+			} else if (!result & partial) {
+				obuf += partial;
+				thistime -= partial;
+			} else
+				break;
+		};
+		if (result) {
+			err("Write Whoops - %x", result);
+			return -EIO;
+		}
+		bytes_written += copy_size;
+		count -= copy_size;
+		buffer += copy_size;
+	} while (count > 0);
+
+	return bytes_written ? bytes_written : -EIO;
+}
+
+static ssize_t
+read_lcd(struct file *file, char *buffer, size_t count, loff_t * ppos)
+{
+	struct lcd_usb_data *lcd = &lcd_instance;
+	ssize_t read_count;
+	unsigned int partial;
+	int this_read;
+	int result;
+	int maxretry = 10;
+	char *ibuf = lcd->ibuf;
+
+	/* Sanity check to make sure lcd is connected, powered, etc */
+	if (lcd == NULL ||
+	    lcd->present == 0 ||
+	    lcd->lcd_dev == NULL)
+		return -1;
+
+	read_count = 0;
+
+	while (count > 0) {
+		if (signal_pending(current)) {
+			return read_count ? read_count : -EINTR;
+		}
+		if (!lcd->lcd_dev)
+			return -ENODEV;
+		this_read = (count >= IBUF_SIZE) ? IBUF_SIZE : count;
+
+		result = usb_bulk_msg(lcd->lcd_dev,
+				      usb_rcvbulkpipe(lcd->lcd_dev, 0),
+				      ibuf, this_read, &partial,
+				      (int) (HZ * 8));
+
+		dbg(KERN_DEBUG "read stats: result:%d this_read:%u partial:%u",
+		       result, this_read, partial);
+
+		if (partial) {
+			count = this_read = partial;
+		} else if (result == USB_ST_TIMEOUT || result == 15) {	/* FIXME: 15 ??? */
+			if (!maxretry--) {
+				err("read_lcd: maxretry timeout");
+				return -ETIME;
+			}
+			interruptible_sleep_on_timeout(&lcd->wait_q,
+						       NAK_TIMEOUT);
+			continue;
+		} else if (result != USB_ST_DATAUNDERRUN) {
+			err("Read Whoops - result:%u partial:%u this_read:%u",
+			     result, partial, this_read);
+			return -EIO;
+		} else {
+			return (0);
+		}
+
+		if (this_read) {
+			if (copy_to_user(buffer, ibuf, this_read))
+				return -EFAULT;
+			count -= this_read;
+			read_count += this_read;
+			buffer += this_read;
+		}
+	}
+	return read_count;
+}
+
+static void *probe_lcd(struct usb_device *dev, unsigned int ifnum)
+{
+	struct lcd_usb_data *lcd = &lcd_instance;
+	int i;
+	
+	if (dev->descriptor.idProduct != 0x0001  ) {
+		warn(KERN_INFO "USBLCD model not supported.");
+		return NULL;
+	}
+
+	if (lcd->present == 1) {
+		warn(KERN_INFO "Multiple USBLCDs are not supported!");
+		return NULL;
+	}
+
+	i = dev->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->devnum);
+
+	lcd->present = 1;
+	lcd->lcd_dev = dev;
+
+	if (!(lcd->obuf = (char *) kmalloc(OBUF_SIZE, GFP_KERNEL))) {
+		err("probe_lcd: Not enough memory for the output buffer");
+		return NULL;
+	}
+	dbg("probe_lcd: obuf address:%p", lcd->obuf);
+
+	if (!(lcd->ibuf = (char *) kmalloc(IBUF_SIZE, GFP_KERNEL))) {
+		err("probe_lcd: Not enough memory for the input buffer");
+		kfree(lcd->obuf);
+		return NULL;
+	}
+	dbg("probe_lcd: ibuf address:%p", lcd->ibuf);
+
+	return lcd;
+}
+
+static void disconnect_lcd(struct usb_device *dev, void *ptr)
+{
+	struct lcd_usb_data *lcd = (struct lcd_usb_data *) ptr;
+
+	if (lcd->isopen) {
+		lcd->isopen = 0;
+		/* better let it finish - the release will do whats needed */
+		lcd->lcd_dev = NULL;
+		return;
+	}
+	kfree(lcd->ibuf);
+	kfree(lcd->obuf);
+
+	info("USBLCD disconnected.");
+
+	lcd->present = 0;
+}
+
+static struct usb_device_id id_table [] = {
+	{ .idVendor = 0x10D2, .match_flags = USB_DEVICE_ID_MATCH_VENDOR, },
+	{},
+};
+
+MODULE_DEVICE_TABLE (usb, id_table);
+
+static struct
+file_operations usb_lcd_fops = {
+	.owner =	THIS_MODULE,
+	.read =		read_lcd,
+	.write =	write_lcd,
+	.ioctl =	ioctl_lcd,
+	.open =		open_lcd,
+	.release =	close_lcd,
+};
+
+static struct
+usb_driver lcd_driver = {
+	.name =		"usblcd",
+	.probe =	(void *)probe_lcd,
+	.disconnect =	disconnect_lcd,
+	.id_table =	id_table,
+	.fops =		&usb_lcd_fops,
+	.minor =	USBLCD_MINOR,
+};
+
+int usb_lcd_init(void)
+{
+	if (usb_register(&lcd_driver) < 0)
+		return -1;
+
+	info("%s (C) Adams IT Services http://www.usblcd.de", DRIVER_VERSION);
+	info("USBLCD support registered.");
+	return 0;
+}
+
+
+void usb_lcd_cleanup(void)
+{
+	struct lcd_usb_data *lcd = &lcd_instance;
+
+	lcd->present = 0;
+	usb_deregister(&lcd_driver);
+}
+
+module_init(usb_lcd_init);
+module_exit(usb_lcd_cleanup);
+
+MODULE_AUTHOR("Adams IT Services <info@usblcd.de>");
+MODULE_DESCRIPTION(DRIVER_VERSION);
+MODULE_LICENSE("GPL");