Greg,
The customer is mounting the device now and I don't have the device to test
anymore. I cleaned up the rest and put in the recommended changes (I lost
the email but it was someone on this list - thanks).
John
--- Greg KH <[EMAIL PROTECTED]> wrote:
> On Sat, Oct 25, 2003 at 11:08:51AM -0700, John Wright wrote:
> > Here is the Magtek Swipe Card Reader device driver. I need a minor
> > number.
>
> Hm, why?
>
> It looks like you can talk to this device from userspace using
> libusb/usbfs, right?
>
> And don't put my name alone on your driver, as I'm not the author of it
> anymore :)
>
> Also, you have a lot of comments and functions from the usb-skeleton
> driver that do not need to be in your driver, try removing them.
>
> thanks,
>
> greg k-h
>
>
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diff -urN -X dontdiff linux-2.4.22-vanilla/Documentation/usb/magtek.txt linux-2.4.22/Documentation/usb/magtek.txt
--- linux-2.4.22-vanilla/Documentation/usb/magtek.txt 1969-12-31 19:00:00.000000000 -0500
+++ linux-2.4.22/Documentation/usb/magtek.txt 2003-10-25 08:04:47.000000000 -0400
@@ -0,0 +1,12 @@
+ MagTek Swipe Card Reader USB kernel driver
+ ==========================================
+
+What is it? What can I do with it?
+==================================
+The MagTek Swipe Card Reader USB kernel driver connects your linux 2.4.x
+system to the MagTek Swipe Card Reader usb-enabled devices.
+
+You may create the devices with:
+ mknod -m 666 /dev/usb/magtek0 c 180 200
+ mknod -m 666 /dev/usb/magtek1 c 180 201
+
diff -urN -X dontdiff linux-2.4.22-vanilla/drivers/usb/Config.in linux-2.4.22/drivers/usb/Config.in
--- linux-2.4.22-vanilla/drivers/usb/Config.in 2003-08-25 07:44:42.000000000 -0400
+++ linux-2.4.22/drivers/usb/Config.in 2003-10-25 07:59:48.000000000 -0400
@@ -106,6 +106,7 @@
dep_tristate ' Texas Instruments Graph Link USB (aka SilverLink) cable support' CONFIG_USB_TIGL $CONFIG_USB
dep_tristate ' Tieman Voyager USB Braille display support (EXPERIMENTAL)' CONFIG_USB_BRLVGER $CONFIG_USB $CONFIG_EXPERIMENTAL
dep_tristate ' USB LCD device support' CONFIG_USB_LCD $CONFIG_USB
+ dep_tristate ' USB MagTek Swipe Card Reader device support' CONFIG_USB_MAGTEK $CONFIG_INPUT
if [ "$CONFIG_ATM" = "y" -o "$CONFIG_ATM" = "m" ]; then
dep_tristate ' Alcatel Speedtouch USB support' CONFIG_USB_SPEEDTOUCH $CONFIG_ATM $CONFIG_USB
fi
diff -urN -X dontdiff linux-2.4.22-vanilla/drivers/usb/hid-core.c linux-2.4.22/drivers/usb/hid-core.c
--- linux-2.4.22-vanilla/drivers/usb/hid-core.c 2003-08-25 07:44:42.000000000 -0400
+++ linux-2.4.22/drivers/usb/hid-core.c 2003-11-02 16:32:45.000000000 -0500
@@ -1182,6 +1182,9 @@
#define USB_VENDOR_ID_MGE 0x0463
#define USB_DEVICE_ID_MGE_UPS 0xffff
#define USB_DEVICE_ID_MGE_UPS1 0x0001
+
+#define USB_VENDOR_ID_MAGTEK 0x0801
+#define USB_PRODUCT_ID_MAGTEK 0x0002
struct hid_blacklist {
__u16 idVendor;
@@ -1237,6 +1240,7 @@
{ USB_VENDOR_ID_ESSENTIAL_REALITY, USB_DEVICE_ID_ESSENTIAL_REALITY_P5, HID_QUIRK_IGNORE },
{ USB_VENDOR_ID_MGE, USB_DEVICE_ID_MGE_UPS, HID_QUIRK_HIDDEV },
{ USB_VENDOR_ID_MGE, USB_DEVICE_ID_MGE_UPS1, HID_QUIRK_HIDDEV },
+ { USB_VENDOR_ID_MAGTEK, USB_PRODUCT_ID_MAGTEK, HID_QUIRK_IGNORE },
{ 0, 0 }
};
diff -urN -X dontdiff linux-2.4.22-vanilla/drivers/usb/magtek.c linux-2.4.22/drivers/usb/magtek.c
--- linux-2.4.22-vanilla/drivers/usb/magtek.c 1969-12-31 19:00:00.000000000 -0500
+++ linux-2.4.22/drivers/usb/magtek.c 2003-11-02 14:40:44.000000000 -0500
@@ -0,0 +1,596 @@
+/*
+ * USB Magtek Swipe Reader Device Driver
+ *
+ * Created by Shawn Campbell ([EMAIL PROTECTED]) from the usb-skeleton
+ * this driver.
+ *
+ *
+ * TODO:
+ * - fix urb->status race condition in write sequence
+ * - move minor_table to a dynamic list.
+ *
+ * History:
+ *
+ * 2003_09_30 - 0.7 - fix licking problem. Cleanup.
+ * 2001_11_05 - 0.6 - fix minor locking problem in skel_disconnect.
+ * 2001_09_04 - 0.5 - fix devfs bug in skel_disconnect. Thanks to wim delvaux
+ * 2001_08_21 - 0.4 - more small bug fixes.
+ * 2001_05_29 - 0.3 - more bug fixes based on review from linux-usb-devel
+ * 2001_05_24 - 0.2 - bug fixes based on review from linux-usb-devel people
+ * 2001_05_01 - 0.1 - first version
+ *
+ * My linux device driver provides access to the swipe devices via major number
+ * 180, minor numbers 200, 201, ... I use the miscellaneous device driver range.
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/signal.h>
+#include <linux/errno.h>
+#include <linux/poll.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/fcntl.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/list.h>
+#include <linux/smp_lock.h>
+#include <linux/devfs_fs_kernel.h>
+#include <linux/usb.h>
+
+#ifdef CONFIG_USB_DEBUG
+ static int debug = 1;
+#else
+ static int debug = 0;
+#endif
+
+/* Use our own dbg macro */
+#undef dbg
+#define dbg(format, arg...) do { if (debug) printk(KERN_DEBUG __FILE__ ": " format "\n" , ## arg); } while (0)
+
+
+/* Version Information */
+#define DRIVER_VERSION "v0.1"
+#define DRIVER_AUTHOR "Greg Kroah-Hartman, [EMAIL PROTECTED]"
+#define DRIVER_DESC "USB Magtek Swipe Reader"
+
+/* Module paramaters */
+MODULE_PARM(debug, "i");
+MODULE_PARM_DESC(debug, "Debug enabled or not");
+
+
+/* Define these values to match your device */
+#define USB_MAGTEK_VENDOR_ID 0x0801
+#define USB_MAGTEK_PRODUCT_ID 0x0002
+
+/* This character should never appear in a report from the device
+ * The character is used to decide where one report ends and
+ * begins.
+*/
+static const char USB_NEW_REPORT = 255;
+
+/* table of devices that work with this driver */
+static struct usb_device_id magtek_table [] = {
+ { USB_DEVICE(USB_MAGTEK_VENDOR_ID, USB_MAGTEK_PRODUCT_ID) },
+ { } /* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE (usb, magtek_table);
+
+
+/* Get a minor range for your devices from the usb maintainer */
+#define USB_MAGTEK_MINOR_BASE 200
+
+/* we can have up to this number of device plugged in at once */
+#define MAX_DEVICES 16
+
+/* define alpha/beta buffer size */
+#define USB_ALPHA_BUFFER_SIZE 64
+#define USB_BETA_BUFFER_SIZE 512
+
+/* Structure to hold all of our device specific stuff */
+struct usb_magtek {
+ struct usb_device * udev; /* save off the usb device pointer */
+ devfs_handle_t devfs; /* devfs device node */
+ unsigned char minor; /* the starting minor number for this device */
+
+ unsigned char alpha_buffer[USB_ALPHA_BUFFER_SIZE]; /* the buffer to receive data from the device */
+ unsigned char beta_buffer[USB_BETA_BUFFER_SIZE]; /* ship to process buffer */
+ int data_size; /* size of the data in the buffer */
+ int packet_size; /* size of the packets returned by usb device */
+ struct urb* urb; /* urb for this device */
+
+ int report_flag; /* full report present? */
+ int open_count; /* number of times this port has been opened */
+ int disconnect_flag; /* flag to wake up on disconnect */
+ spinlock_t lock; /* locks this structure */
+
+};
+
+
+/* the global usb devfs handle */
+extern devfs_handle_t usb_devfs_handle;
+
+
+/* local function prototypes */
+static ssize_t magtek_read (struct file *file, char *buffer, size_t count, loff_t *ppos);
+static int magtek_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg);
+static int magtek_open (struct inode *inode, struct file *file);
+static int magtek_release (struct inode *inode, struct file *file);
+
+static void * magtek_probe (struct usb_device *dev, unsigned int ifnum, const struct usb_device_id *id);
+static void magtek_disconnect (struct usb_device *dev, void *ptr);
+static void magtek_irq (struct urb *urb);
+
+/* array of pointers to our devices that are currently connected */
+static struct usb_magtek *minor_table[MAX_DEVICES];
+
+/* lock to protect the minor_table structure */
+static DECLARE_MUTEX (minor_table_mutex);
+
+/* declare a wait queue */
+static DECLARE_WAIT_QUEUE_HEAD(queue);
+
+/*
+ * File operations needed when we register this driver.
+ */
+static struct file_operations magtek_fops = {
+ owner: THIS_MODULE,
+
+ read: magtek_read,
+ ioctl: magtek_ioctl,
+ open: magtek_open,
+ release: magtek_release,
+};
+
+
+/* register magtek driver with the usb subsystem */
+static struct usb_driver magtek_driver = {
+ name: "magtek",
+ probe: magtek_probe,
+ disconnect: magtek_disconnect,
+ fops: &magtek_fops,
+ minor: USB_MAGTEK_MINOR_BASE,
+ id_table: magtek_table,
+};
+
+/**
+ * magtek_irq
+ */
+static void magtek_irq(struct urb* urb)
+{
+ struct usb_magtek* priv = urb->context;
+
+ if(urb->status != USB_ST_NOERROR) return;
+ if(urb->actual_length < 0) return;
+
+ spin_lock(&priv->lock);
+
+ /* previous report cleared? */
+ if(priv->report_flag) {
+ priv->report_flag=0;
+ priv->data_size=0;
+ err("Lost a report!");
+ }
+
+ /* check for buffer overflow */
+ /* NOTE: Increase USB_BETA_BUFFER_SIZE to equal or exceed your report size */
+ else if((priv->data_size + urb->actual_length) > USB_BETA_BUFFER_SIZE) {
+ /* data too big */
+ err("Beta Buffer Overflow!");
+ priv->data_size=0;
+ spin_unlock(&priv->lock);
+ return;
+ }
+
+ /* copy report fragment */
+ memcpy(priv->beta_buffer+priv->data_size,priv->alpha_buffer,urb->actual_length);
+ priv->data_size = priv->data_size + urb->actual_length;
+
+ /* notify any processes */
+ if(urb->actual_length <= priv->packet_size) {
+ priv->report_flag=1;
+ wake_up_interruptible(&queue);
+ }
+
+ spin_unlock(&priv->lock);
+}
+
+/**
+ * magtek_open
+ */
+static int magtek_open (struct inode *inode, struct file *file)
+{
+ struct usb_magtek *dev = NULL;
+ int subminor;
+
+ subminor = MINOR (inode->i_rdev) - USB_MAGTEK_MINOR_BASE;
+ if ((subminor < 0) ||
+ (subminor >= MAX_DEVICES)) {
+ return -ENODEV;
+ }
+
+ /* lock our minor table and get our local data for this minor */
+ down (&minor_table_mutex);
+ dev = minor_table[subminor];
+ if (dev == NULL) {
+ up (&minor_table_mutex);
+ return -ENODEV;
+ }
+
+ /* lock this device */
+ spin_lock(&dev->lock);
+
+ /* unlock the minor table */
+ up (&minor_table_mutex);
+
+ if(dev->open_count) {
+ /* device already open by another process */
+ spin_unlock(&dev->lock);
+ return -EBUSY;
+ }
+
+ /* increment our usage count for the driver */
+ ++dev->open_count;
+
+ /* save our object in the file's private structure */
+ file->private_data = dev;
+
+ /* unlock this device */
+ spin_unlock(&dev->lock);
+
+ return 0;
+}
+
+
+/**
+ * magtek_release
+ */
+static int magtek_release (struct inode *inode, struct file *file)
+{
+ struct usb_magtek *dev;
+ int retval = 0;
+
+ dev = (struct usb_magtek *)file->private_data;
+ if (dev == NULL) {
+ if(debug) dbg (__FUNCTION__ " - object is NULL");
+ return -ENODEV;
+ }
+
+ if(debug) dbg(__FUNCTION__ " - minor %d", dev->minor);
+
+ /* lock our minor table */
+ down (&minor_table_mutex);
+
+ /* lock our device */
+ spin_lock (&dev->lock);
+
+ if (dev->open_count <= 0) {
+ if(debug) dbg (__FUNCTION__ " - device not opened");
+ retval = -ENODEV;
+ goto exit_not_opened;
+ }
+
+ if (dev->udev == NULL) {
+ /* the device was unplugged before the file was released */
+ if(dev->urb) kfree(dev);
+ retval = -ENODEV;
+ }
+ else {
+ /* decrement our usage count for the device */
+ --dev->open_count;
+ }
+
+
+exit_not_opened:
+ spin_unlock (&dev->lock);
+ up (&minor_table_mutex);
+
+ return retval;
+}
+
+
+/**
+ * magtek_read
+ */
+static ssize_t magtek_read (struct file *file, char *buffer, size_t count, loff_t *ppos)
+{
+ struct usb_magtek *dev;
+ unsigned long flags;
+ ssize_t size;
+
+ /* any non-zero seek is invalid */
+ if(*ppos) return -ESPIPE;
+
+ /* buffer too small */
+ if(count < 1) return -EFAULT;
+
+ dev = (struct usb_magtek *)file->private_data;
+
+ if(debug) dbg(__FUNCTION__ " - ppos %d, minor %d, count = %d", (int)(*ppos), dev->minor, count);
+
+ /* lock this object */
+ spin_lock_irqsave(&dev->lock,flags);
+
+ /* verify that the device wasn't unplugged */
+ if (dev->udev == NULL) {
+ spin_unlock_irqrestore (&dev->lock,flags);
+ return -ENODEV;
+ }
+
+ /* unlock this object */
+ spin_unlock_irqrestore(&dev->lock,flags);
+
+ /* sleep until data or signal */
+ if(wait_event_interruptible(queue, dev->report_flag || dev->disconnect_flag)) return -EINTR;
+
+ /* was device disconnected? */
+ if(dev->disconnect_flag) return -EIO;
+
+
+ /* ensure that only the correct number of bytes are copied back */
+ spin_lock_irqsave(&dev->lock,flags);
+
+ if(((ssize_t)dev->data_size < (ssize_t)count)) {
+ /* normal */
+ size=(ssize_t)dev->data_size;
+ }
+ else {
+ /* too much data, data lost */
+ err("Data was lost!");
+ size=(ssize_t)count;
+ }
+
+ spin_unlock_irqrestore(&dev->lock,flags);
+
+ /* copy data to userspace */
+ if (copy_to_user (buffer, dev->beta_buffer, (unsigned long)size))
+ {
+ return -EFAULT;
+ }
+
+ spin_lock_irqsave(&dev->lock,flags);
+
+ dev->data_size=0; /* mark the buffer as empty */
+ dev->report_flag=0; /* indicate that reported was received */
+
+ /* unlock the device */
+ spin_unlock_irqrestore (&dev->lock,flags);
+
+ return size;
+}
+
+/**
+ * magtek_ioctl
+ */
+static int magtek_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+{
+ struct usb_magtek *dev;
+ unsigned long flags;
+
+ dev = (struct usb_magtek *)file->private_data;
+
+ /* lock this object */
+ spin_lock_irqsave (&dev->lock,flags);
+
+ /* verify that the device wasn't unplugged */
+ if (dev->udev == NULL) {
+ spin_unlock_irqrestore (&dev->lock,flags);
+ return -ENODEV;
+ }
+
+ if(debug) dbg(__FUNCTION__ " - minor %d, cmd 0x%.4x, arg %ld",
+ dev->minor, cmd, arg);
+
+
+ /* fill in your device specific stuff here */
+
+ /* unlock the device */
+ spin_unlock_irqrestore (&dev->lock,flags);
+
+ /* return that we did not understand this ioctl call */
+ return -ENOTTY;
+}
+
+
+/**
+ * magtek_probe
+ */
+static void * magtek_probe(struct usb_device *udev, unsigned int ifnum, const struct usb_device_id *id)
+{
+ struct usb_magtek *dev = NULL;
+ struct usb_interface *interface;
+ struct usb_interface_descriptor *iface_desc;
+ struct usb_endpoint_descriptor *endpoint;
+ int minor;
+ int i;
+ char name[10];
+ int pipe, maxp;
+
+ /* See if the device offered us matches what we can accept */
+ if ((udev->descriptor.idVendor != USB_MAGTEK_VENDOR_ID) ||
+ (udev->descriptor.idProduct != USB_MAGTEK_PRODUCT_ID)) {
+ return NULL;
+ }
+
+ /* select a "subminor" number (part of a minor number) */
+ down (&minor_table_mutex);
+ for (minor = 0; minor < MAX_DEVICES; ++minor) {
+ if (minor_table[minor] == NULL)
+ break;
+ }
+ if (minor >= MAX_DEVICES) {
+ info ("Too many devices plugged in, can not handle this device.");
+ up(&minor_table_mutex);
+ return NULL;
+ }
+
+ /* allocate memory for our device state and intialize it */
+ dev = kmalloc (sizeof(struct usb_magtek), GFP_KERNEL);
+ if (dev == NULL) {
+ err ("Out of memory");
+ up(&minor_table_mutex);
+ return NULL;
+ }
+
+ /* zero the data structure (note: dev->data is set to zero here) */
+ memset(dev,0,sizeof(struct usb_magtek));
+
+ spin_lock_init(&dev->lock);
+ interface = &udev->actconfig->interface[ifnum];
+
+ /* setup device specific data structure */
+ dev->udev = udev;
+ /* dev->interface = interface; */
+ dev->minor = minor;
+
+ /* set up the endpoint information */
+ /* check out the endpoints */
+ iface_desc = &interface->altsetting[0];
+ for (i = 0; i < iface_desc->bNumEndpoints; ++i) {
+ endpoint = &iface_desc->endpoint[i];
+
+ if ((endpoint->bEndpointAddress & 0x80) && ((endpoint->bmAttributes & 3) == 0x03))
+ break; /* we found an interrupt in endpoint */
+ }
+ if(i>=iface_desc->bNumEndpoints){
+ info("No supported endpoints found.");
+ up(&minor_table_mutex);
+ kfree(dev);
+ return NULL;
+ }
+
+ /* initialize the devfs node for this device and register it */
+ sprintf(name, "magtek%d", dev->minor);
+
+ dev->devfs = devfs_register (usb_devfs_handle, name,
+ DEVFS_FL_DEFAULT, USB_MAJOR,
+ USB_MAGTEK_MINOR_BASE + dev->minor,
+ S_IFCHR | S_IRUSR | S_IWUSR |
+ S_IRGRP | S_IWGRP | S_IROTH,
+ &magtek_fops, NULL);
+
+ /* let the user know what node this device is now attached to */
+ info ("USB Magtek Swipe Reader device now attached to USBMagtek%d", dev->minor);
+
+ /* submit a urb */
+ /* allocate and zero the device urb */
+ dev->urb=kmalloc(sizeof(struct urb), GFP_KERNEL);
+ if(dev->urb == NULL) {
+ err("Out of memory");
+ kfree(dev);
+ up(&minor_table_mutex);
+ return NULL;
+ }
+ memset(dev->urb, 0, sizeof(struct urb));
+
+ /* fill the URB data structure */
+ pipe=usb_rcvintpipe(dev->udev, endpoint->bEndpointAddress);
+ maxp = usb_maxpacket(dev->udev, pipe, usb_pipeout(pipe));
+
+ usb_fill_int_urb(dev->urb, dev->udev, pipe, dev->alpha_buffer, maxp > USB_ALPHA_BUFFER_SIZE ? USB_ALPHA_BUFFER_SIZE : maxp, magtek_irq, dev, endpoint->bInterval);
+
+ /* register the URB within the USB subsystem */
+ if (usb_submit_urb(dev->urb)) {
+ kfree(dev->urb);
+ kfree(dev);
+ up(&minor_table_mutex);
+ return NULL;
+ }
+
+ dev->packet_size = maxp > USB_ALPHA_BUFFER_SIZE ? USB_ALPHA_BUFFER_SIZE : maxp;
+ dev->disconnect_flag=0;
+ dev->report_flag=0; /* not a full report */
+
+ minor_table[minor] = dev;
+ up(&minor_table_mutex);
+ return dev;
+}
+
+
+/**
+ * magtek_disconnect
+ */
+static void magtek_disconnect(struct usb_device *udev, void *ptr)
+{
+ struct usb_magtek *dev;
+ int minor;
+ unsigned long flags;
+
+ dev = (struct usb_magtek *)ptr;
+
+ spin_lock_irqsave (&dev->lock,flags);
+
+ minor = dev->minor;
+
+ /* remove our devfs node */
+ devfs_unregister(dev->devfs);
+
+ spin_unlock_irqrestore (&dev->lock,flags);
+
+ if(dev->urb != NULL) usb_unlink_urb(dev->urb);
+
+ spin_lock_irqsave (&dev->lock,flags);
+
+ /* if the device is not opened, then we clean up right now */
+ if (!dev->open_count) {
+ kfree(dev);
+ down(&minor_table_mutex);
+ minor_table[dev->minor]=NULL;
+ up(&minor_table_mutex);
+ spin_unlock_irqrestore(&dev->lock,flags);
+ info("USB Magtek Swipe Reader #%d now disconnected", minor);
+ } else {
+ dev->udev = NULL;
+ down(&minor_table_mutex);
+ minor_table[dev->minor]=NULL;
+ up (&minor_table_mutex);
+ spin_unlock_irqrestore (&dev->lock,flags);
+ info("USB Magtek Swipe Reader #%d now disconnected", minor);
+ dev->disconnect_flag=1;
+ wake_up_interruptible(&queue);
+ }
+
+}
+
+
+
+/**
+ * usb_magtek_init
+ */
+static int __init usb_magtek_init(void)
+{
+ int result;
+
+ /* register this driver with the USB subsystem */
+ result = usb_register(&magtek_driver);
+ if (result < 0) {
+ err("usb_register failed for the "__FILE__" driver. Error number %d",
+ result);
+ return -1;
+ }
+
+ info(DRIVER_DESC " " DRIVER_VERSION);
+ return 0;
+}
+
+
+/**
+ * usb_magtek_exit
+ */
+static void __exit usb_magtek_exit(void)
+{
+ /* deregister this driver with the USB subsystem */
+ usb_deregister(&magtek_driver);
+}
+
+
+module_init (usb_magtek_init);
+module_exit (usb_magtek_exit);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
diff -urN -X dontdiff linux-2.4.22-vanilla/drivers/usb/Makefile linux-2.4.22/drivers/usb/Makefile
--- linux-2.4.22-vanilla/drivers/usb/Makefile 2003-08-25 07:44:42.000000000 -0400
+++ linux-2.4.22/drivers/usb/Makefile 2003-10-25 07:58:36.000000000 -0400
@@ -119,6 +119,7 @@
obj-$(CONFIG_USB_BRLVGER) += brlvger.o
obj-$(CONFIG_USB_LCD) += usblcd.o
obj-$(CONFIG_USB_SPEEDTOUCH) += speedtch.o
+obj-$(CONFIG_USB_MAGTEK) += magtek.o
# Object files in subdirectories
mod-subdirs := serial host
