This is a CPC CAN USB driver.
Just some comments:
cpcusb.h and cpc-usb_drv.c: Essential driver source code
sja2m16c_2.c: Helper for converting bitrate timings
cpc.h: Structures and definition needed to communicate with the device
From: Sebastian Haas <haas@ems-wuensche.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- /dev/null
+/*
+ * CPC-USB CAN Interface Kernel Driver
+ *
+ * Copyright (C) 2004-2009 EMS Dr. Thomas Wuensche
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/module.h>
+#include <linux/poll.h>
+#include <linux/smp_lock.h>
+#include <linux/completion.h>
+#include <asm/uaccess.h>
+#include <linux/usb.h>
+
+#include <linux/version.h>
+
+/* usb_kill_urb has been introduced in kernel version 2.6.8 (RC2) */
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,8))
+#define usb_kill_urb usb_unlink_urb
+#endif
+
+#ifdef CONFIG_PROC_FS
+# include <linux/proc_fs.h>
+#endif
+
+#include "cpc.h"
+
+#include "cpc_int.h"
+#include "cpcusb.h"
+
+#include "sja2m16c.h"
+
+/* Version Information */
+#define DRIVER_AUTHOR "Sebastian Haas <haas@ems-wuensche.com>"
+#define DRIVER_DESC "CPC-USB Driver for Linux Kernel 2.6"
+#define DRIVER_VERSION CPC_DRIVER_VERSION " (CDKL v" CDKL_VERSION ")"
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL v2");
+
+/* Define these values to match your devices */
+#define USB_CPCUSB_VENDOR_ID 0x12D6
+
+#define USB_CPCUSB_M16C_PRODUCT_ID 0x0888
+#define USB_CPCUSB_LPC2119_PRODUCT_ID 0x0444
+
+#ifndef CONFIG_PROC_FS
+#error "PROCFS needed"
+#endif
+
+#define CPC_USB_PROC_DIR CPC_PROC_DIR "cpc-usb"
+
+static struct proc_dir_entry *procDir = NULL;
+static struct proc_dir_entry *procEntry = NULL;
+
+/* Module parameters */
+static int debug = 0;
+module_param(debug, int, S_IRUGO);
+
+/* table of devices that work with this driver */
+static struct usb_device_id cpcusb_table[] = {
+ {USB_DEVICE(USB_CPCUSB_VENDOR_ID, USB_CPCUSB_M16C_PRODUCT_ID)},
+ {USB_DEVICE(USB_CPCUSB_VENDOR_ID, USB_CPCUSB_LPC2119_PRODUCT_ID)},
+ {} /* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE(usb, cpcusb_table);
+
+/* use to prevent kernel panic if driver is unloaded
+ * while a programm has still open the device
+ */
+DECLARE_WAIT_QUEUE_HEAD(rmmodWq);
+atomic_t useCount;
+
+static CPC_USB_T *CPCUSB_Table[CPC_USB_CARD_CNT] = { 0 };
+static unsigned int CPCUsbCnt = 0;
+
+/* prevent races between open() and disconnect() */
+static DECLARE_MUTEX(disconnect_sem);
+
+/* local function prototypes */
+static ssize_t cpcusb_read(struct file *file, char *buffer, size_t count,
+ loff_t * ppos);
+static ssize_t cpcusb_write(struct file *file, const char *buffer,
+ size_t count, loff_t * ppos);
+static unsigned int cpcusb_poll(struct file *file, poll_table * wait);
+static int cpcusb_open(struct inode *inode, struct file *file);
+static int cpcusb_release(struct inode *inode, struct file *file);
+
+static int cpcusb_probe(struct usb_interface *interface,
+ const struct usb_device_id *id);
+static void cpcusb_disconnect(struct usb_interface *interface);
+
+static void cpcusb_read_bulk_callback(struct urb *urb
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19))
+ , struct pt_regs *regs
+#endif
+);
+static void cpcusb_write_bulk_callback(struct urb *urb
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19))
+ , struct pt_regs *regs
+#endif
+);
+static void cpcusb_read_interrupt_callback(struct urb *urb
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19))
+ , struct pt_regs *regs
+#endif
+);
+
+static int cpcusb_setup_intrep(CPC_USB_T * card);
+
+static struct file_operations cpcusb_fops = {
+ /*
+ * The owner field is part of the module-locking
+ * mechanism. The idea is that the kernel knows
+ * which module to increment the use-counter of
+ * BEFORE it calls the device's open() function.
+ * This also means that the kernel can decrement
+ * the use-counter again before calling release()
+ * or should the open() function fail.
+ */
+ .owner = THIS_MODULE,
+
+ .read = cpcusb_read,
+ .write = cpcusb_write,
+ .poll = cpcusb_poll,
+ .open = cpcusb_open,
+ .release = cpcusb_release,
+};
+
+/*
+ * usb class driver info in order to get a minor number from the usb core,
+ * and to have the device registered with devfs and the driver core
+ */
+static struct usb_class_driver cpcusb_class = {
+ .name = "usb/cpc_usb%d",
+ .fops = &cpcusb_fops,
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,14))
+ .mode =
+ S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH |
+ S_IWOTH,
+#endif
+ .minor_base = CPC_USB_BASE_MNR,
+};
+
+/* usb specific object needed to register this driver with the usb subsystem */
+static struct usb_driver cpcusb_driver = {
+#if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,14))
+ .owner = THIS_MODULE,
+#endif
+ .name = "cpc-usb",
+ .probe = cpcusb_probe,
+ .disconnect = cpcusb_disconnect,
+ .id_table = cpcusb_table,
+};
+
+static int cpcusb_create_info_output(char *buf)
+{
+ int i = 0, j;
+
+ for (j = 0; j < CPC_USB_CARD_CNT; j++) {
+ if (CPCUSB_Table[j]) {
+ CPC_USB_T *card = CPCUSB_Table[j];
+ CPC_CHAN_T *chan = card->chan;
+
+ /* MINOR CHANNELNO BUSNO SLOTNO */
+ i += sprintf(&buf[i], "%d %s\n", chan->minor,
+ card->serialNumber);
+ }
+ }
+
+ return i;
+}
+
+static int cpcusb_proc_read_info(char *page, char **start, off_t off,
+ int count, int *eof, void *data)
+{
+ int len = cpcusb_create_info_output(page);
+
+ if (len <= off + count)
+ *eof = 1;
+ *start = page + off;
+ len -= off;
+ if (len > count)
+ len = count;
+ if (len < 0)
+ len = 0;
+
+ return len;
+}
+
+/*
+ * Remove CPC-USB and cleanup
+ */
+static inline void cpcusb_delete(CPC_USB_T * card)
+{
+ if (card) {
+ if (card->chan) {
+ if (card->chan->buf)
+ vfree(card->chan->buf);
+
+ if (card->chan->CPCWait_q)
+ kfree(card->chan->CPCWait_q);
+
+ kfree(card->chan);
+ }
+
+ CPCUSB_Table[card->idx] = NULL;
+ kfree(card);
+ }
+}
+
+/*
+ * setup the interrupt IN endpoint of a specific CPC-USB device
+ */
+static int cpcusb_setup_intrep(CPC_USB_T * card)
+{
+ int retval = 0;
+ struct usb_endpoint_descriptor *ep;
+
+ ep = &card->interface->altsetting[0].endpoint[card->num_intr_in].desc;
+
+ card->intr_in_buffer[0] = 0;
+ card->free_slots = 15; /* initial size */
+
+ /* setup the urb */
+ usb_fill_int_urb(card->intr_in_urb, card->udev,
+ usb_rcvintpipe(card->udev, card->num_intr_in),
+ card->intr_in_buffer,
+ sizeof(card->intr_in_buffer),
+ cpcusb_read_interrupt_callback,
+ card,
+ ep->bInterval);
+
+ card->intr_in_urb->status = 0; /* needed! */
+
+ /* submit the urb */
+ retval = usb_submit_urb(card->intr_in_urb, GFP_KERNEL);
+
+ if (retval) {
+ err("%s - failed submitting intr urb, error %d", __FUNCTION__, retval);
+ }
+
+ return retval;
+}
+
+static int cpcusb_open(struct inode *inode, struct file *file)
+{
+ CPC_USB_T *card = NULL;
+ struct usb_interface *interface;
+ int subminor;
+ int j, retval = 0;
+
+ subminor = iminor(inode);
+
+ /* prevent disconnects */
+ down(&disconnect_sem);
+
+ interface = usb_find_interface(&cpcusb_driver, subminor);
+ if (!interface) {
+ err("%s - error, can't find device for minor %d",
+ __FUNCTION__, subminor);
+ retval = CPC_ERR_NO_INTERFACE_PRESENT;
+ goto exit_no_device;
+ }
+
+ card = usb_get_intfdata(interface);
+ if (!card) {
+ retval = CPC_ERR_NO_INTERFACE_PRESENT;
+ goto exit_no_device;
+ }
+
+ /* lock this device */
+ down(&card->sem);
+
+ /* increment our usage count for the driver */
+ if (card->open) {
+ dbg("device already opened");
+ retval = CPC_ERR_CHANNEL_ALREADY_OPEN;
+ goto exit_on_error;
+ }
+
+ /* save our object in the file's private structure */
+ file->private_data = card;
+ for (j = 0; j < CPC_USB_URB_CNT; j++) {
+ usb_fill_bulk_urb(card->urbs[j].urb, card->udev,
+ usb_rcvbulkpipe(card->udev, card->num_bulk_in),
+ card->urbs[j].buffer, card->urbs[j].size,
+ cpcusb_read_bulk_callback, card);
+
+ retval = usb_submit_urb(card->urbs[j].urb, GFP_KERNEL);
+
+ if (retval) {
+ err("%s - failed submitting read urb, error %d",
+ __FUNCTION__, retval);
+ retval = CPC_ERR_TRANSMISSION_FAILED;
+ goto exit_on_error;
+ }
+ }
+
+ info("%s - %d URB's submitted", __FUNCTION__, j);
+
+ ResetBuffer(card->chan);
+
+ cpcusb_setup_intrep(card);
+ card->open = 1;
+
+ atomic_inc(&useCount);
+
+exit_on_error:
+ /* unlock this device */
+ up(&card->sem);
+
+exit_no_device:
+ up(&disconnect_sem);
+
+ return retval;
+}
+
+static unsigned int cpcusb_poll(struct file *file, poll_table * wait)
+{
+ CPC_USB_T *card = (CPC_USB_T *) file->private_data;
+ unsigned int retval = 0;
+
+ if (!card) {
+ err("%s - device object lost", __FUNCTION__);
+ return -EIO;
+ }
+
+ poll_wait(file, card->chan->CPCWait_q, wait);
+
+ if (IsBufferNotEmpty(card->chan) || !(card->present))
+ retval |= (POLLIN | POLLRDNORM);
+
+ if (card->free_slots)
+ retval |= (POLLOUT | POLLWRNORM);
+
+ return retval;
+}
+
+static int cpcusb_release(struct inode *inode, struct file *file)
+{
+ CPC_USB_T *card = (CPC_USB_T *) file->private_data;
+ int j, retval = 0;
+
+ if (card == NULL) {
+ dbg("%s - object is NULL", __FUNCTION__);
+ return CPC_ERR_NO_INTERFACE_PRESENT;
+ }
+
+ /* lock our device */
+ down(&card->sem);
+
+ if (!card->open) {
+ dbg("%s - device not opened", __FUNCTION__);
+ retval = CPC_ERR_NO_INTERFACE_PRESENT;
+ goto exit_not_opened;
+ }
+
+ /* if device wasn't unplugged kill all urbs */
+ if (card->present) {
+ /* kill read urbs */
+ for (j = 0; j < CPC_USB_URB_CNT; j++) {
+ usb_kill_urb(card->urbs[j].urb);
+ }
+
+ /* kill irq urb */
+ usb_kill_urb(card->intr_in_urb);
+
+ /* kill write urbs */
+ for (j = 0; j < CPC_USB_URB_CNT; j++) {
+ if (atomic_read(&card->wrUrbs[j].busy)) {
+ usb_kill_urb(card->wrUrbs[j].urb);
+ wait_for_completion(&card->wrUrbs[j].finished);
+ }
+ }
+ }
+
+ atomic_dec(&useCount);
+
+ /* last process detached */
+ if (atomic_read(&useCount) == 0) {
+ wake_up(&rmmodWq);
+ }
+
+ if (!card->present && card->open) {
+ /* the device was unplugged before the file was released */
+ up(&card->sem);
+ cpcusb_delete(card);
+ return 0;
+ }
+
+ card->open = 0;
+
+exit_not_opened:
+ up(&card->sem);
+
+ return 0;
+}
+
+static ssize_t cpcusb_read(struct file *file, char *buffer, size_t count,
+ loff_t * ppos)
+{
+ CPC_USB_T *card = (CPC_USB_T *) file->private_data;
+ CPC_CHAN_T *chan;
+ int retval = 0;
+
+ if (count < sizeof(CPC_MSG_T))
+ return CPC_ERR_UNKNOWN;
+
+ /* check if can read from the given address */
+ if (!access_ok(VERIFY_WRITE, buffer, count))
+ return CPC_ERR_UNKNOWN;
+
+ /* lock this object */
+ down(&card->sem);
+
+ /* verify that the device wasn't unplugged */
+ if (!card->present) {
+ up(&card->sem);
+ return CPC_ERR_NO_INTERFACE_PRESENT;
+ }
+
+ if (IsBufferEmpty(card->chan)) {
+ retval = 0;
+ } else {
+ chan = card->chan;
+
+#if 0
+ /* convert LPC2119 params back to SJA1000 params */
+ if (card->deviceRevision >= 0x0200
+ && chan->buf[chan->oidx].type == CPC_MSG_T_CAN_PRMS) {
+ LPC2119_TO_SJA1000_Params(&chan->buf[chan->oidx]);
+ }
+#endif
+
+ if (copy_to_user(buffer, &chan->buf[chan->oidx], count) != 0) {
+ retval = CPC_ERR_IO_TRANSFER;
+ } else {
+ chan->oidx = (chan->oidx + 1) % CPC_MSG_BUF_CNT;
+ chan->WnR = 1;
+ retval = sizeof(CPC_MSG_T);
+ }
+ }
+// spin_unlock_irqrestore(&card->slock, flags);
+
+ /* unlock the device */
+ up(&card->sem);
+
+ return retval;
+}
+
+#define SHIFT 1
+static void inline cpcusb_align_buffer_alignment(unsigned char *buf)
+{
+ // CPC-USB uploads packed bytes.
+ CPC_MSG_T *cpc = (CPC_MSG_T *) buf;
+ unsigned int i;
+
+ for (i = 0; i < cpc->length + (2 * sizeof(unsigned long)); i++) {
+ ((unsigned char *) &cpc->msgid)[1 + i] =
+ ((unsigned char *) &cpc->msgid)[1 + SHIFT + i];
+ }
+}
+
+static int cpc_get_buffer_count(CPC_CHAN_T * chan)
+{
+ // check the buffer parameters
+ if (chan->iidx == chan->oidx)
+ return !chan->WnR ? CPC_MSG_BUF_CNT : 0;
+ else if (chan->iidx >= chan->oidx)
+ return (chan->iidx - chan->oidx) % CPC_MSG_BUF_CNT;
+
+ return (chan->iidx + CPC_MSG_BUF_CNT - chan->oidx) % CPC_MSG_BUF_CNT;
+}
+
+static ssize_t cpcusb_write(struct file *file, const char *buffer,
+ size_t count, loff_t * ppos)
+{
+ CPC_USB_T *card = (CPC_USB_T *) file->private_data;
+ CPC_USB_WRITE_URB_T *wrUrb = NULL;
+
+ ssize_t bytes_written = 0;
+ int retval = 0;
+ int j;
+
+ unsigned char *obuf = NULL;
+ unsigned char type = 0;
+ CPC_MSG_T *info = NULL;
+
+ dbg("%s - entered minor %d, count = %d, present = %d",
+ __FUNCTION__, card->minor, count, card->present);
+
+ if (count > sizeof(CPC_MSG_T))
+ return CPC_ERR_UNKNOWN;
+
+ /* check if can read from the given address */
+ if (!access_ok(VERIFY_READ, buffer, count))
+ return CPC_ERR_UNKNOWN;
+
+ /* lock this object */
+ down(&card->sem);
+
+ /* verify that the device wasn't unplugged */
+ if (!card->present) {
+ retval = CPC_ERR_NO_INTERFACE_PRESENT;
+ goto exit;
+ }
+
+ /* verify that we actually have some data to write */
+ if (count == 0) {
+ dbg("%s - write request of 0 bytes", __FUNCTION__);
+ goto exit;
+ }
+
+ if (card->free_slots <= 5) {
+ info = (CPC_MSG_T *) buffer;
+
+ if (info->type != CPC_CMD_T_CLEAR_CMD_QUEUE
+ || card->free_slots <= 0) {
+ dbg("%s - send buffer full please try again %d",
+ __FUNCTION__, card->free_slots);
+ retval = CPC_ERR_CAN_NO_TRANSMIT_BUF;
+ goto exit;
+ }
+ }
+
+ /* Find a free write urb */
+ for (j = 0; j < CPC_USB_URB_CNT; j++) {
+ if (!atomic_read(&card->wrUrbs[j].busy)) {
+ wrUrb = &card->wrUrbs[j]; /* remember found URB */
+ atomic_set(&wrUrb->busy, 1); /* lock this URB */
+ init_completion(&wrUrb->finished); /* init completion */
+ dbg("WR URB no. %d started", j);
+ break;
+ }
+ }
+
+ /* don't found write urb say error */
+ if (!wrUrb) {
+ dbg("%s - no free send urb available", __FUNCTION__);
+ retval = CPC_ERR_CAN_NO_TRANSMIT_BUF;
+ goto exit;
+ }
+ dbg("URB write req");
+
+ obuf = (unsigned char *) wrUrb->urb->transfer_buffer;
+
+ /* copy the data from userspace into our transfer buffer;
+ * this is the only copy required.
+ */
+ if (copy_from_user(&obuf[4], buffer, count) != 0) {
+ atomic_set(&wrUrb->busy, 0); /* release urb */
+ retval = CPC_ERR_IO_TRANSFER;
+ goto exit;
+ }
+
+ /* check if it is a DRIVER information message, so we can
+ * response to that message and not the USB
+ */
+ info = (CPC_MSG_T *) & obuf[4];
+
+ bytes_written = 11 + info->length;
+ if (bytes_written >= wrUrb->size) {
+ retval = CPC_ERR_IO_TRANSFER;
+ goto exit;
+ }
+
+ switch (info->type) {
+ case CPC_CMD_T_CLEAR_MSG_QUEUE:
+ ResetBuffer(card->chan);
+ break;
+
+ case CPC_CMD_T_INQ_MSG_QUEUE_CNT:
+ retval = cpc_get_buffer_count(card->chan);
+ atomic_set(&wrUrb->busy, 0);
+
+ goto exit;
+
+ case CPC_CMD_T_INQ_INFO:
+ if (info->msg.info.source == CPC_INFOMSG_T_DRIVER) {
+ /* release urb cause we'll use it for driver
+ * information
+ */
+ atomic_set(&wrUrb->busy, 0);
+ if (IsBufferFull(card->chan)) {
+ retval = CPC_ERR_IO_TRANSFER;
+ goto exit;
+ }
+
+ /* it is a driver information request message and we have
+ * free rx slots to store the response
+ */
+ type = info->msg.info.type;
+ info = &card->chan->buf[card->chan->iidx];
+
+ info->type = CPC_MSG_T_INFO;
+ info->msg.info.source = CPC_INFOMSG_T_DRIVER;
+ info->msg.info.type = type;
+
+ switch (type) {
+ case CPC_INFOMSG_T_VERSION:
+ info->length = strlen(CPC_DRIVER_VERSION) + 2;
+ sprintf(info->msg.info.msg, "%s\n",
+ CPC_DRIVER_VERSION);
+ break;
+
+ case CPC_INFOMSG_T_SERIAL:
+ info->length = strlen(CPC_DRIVER_SERIAL) + 2;
+ sprintf(info->msg.info.msg, "%s\n",
+ CPC_DRIVER_SERIAL);
+ break;
+
+ default:
+ info->length = 2;
+ info->msg.info.type =
+ CPC_INFOMSG_T_UNKNOWN_TYPE;
+ }
+
+ card->chan->WnR = 0;
+ card->chan->iidx =
+ (card->chan->iidx + 1) % CPC_MSG_BUF_CNT;
+
+ retval = info->length;
+ goto exit;
+ }
+ break;
+ case CPC_CMD_T_CAN_PRMS:
+ /* Check the controller type. If it's the new CPC-USB, make sure if these are SJA1000 params */
+ if (info->msg.canparams.cc_type != SJA1000
+ && info->msg.canparams.cc_type != M16C_BASIC
+ && (card->productId == USB_CPCUSB_LPC2119_PRODUCT_ID
+ && info->msg.canparams.cc_type != SJA1000)) {
+ /* don't forget to release the urb */
+ atomic_set(&wrUrb->busy, 0);
+ retval = CPC_ERR_WRONG_CONTROLLER_TYPE;
+ goto exit;
+ }
+ break;
+ }
+
+ /* just convert the params if it is an old CPC-USB with M16C controller */
+ if (card->productId == USB_CPCUSB_M16C_PRODUCT_ID) {
+ /* if it is a parameter message convert it from SJA1000 controller
+ * settings to M16C Basic controller settings
+ */
+ SJA1000_TO_M16C_BASIC_Params((CPC_MSG_T *) & obuf[4]);
+ }
+
+ /* don't forget the byte alignment */
+ cpcusb_align_buffer_alignment(&obuf[4]);
+
+ /* setup a the 4 byte header */
+ obuf[0] = obuf[1] = obuf[2] = obuf[3] = 0;
+
+ /* this urb was already set up, except for this write size */
+ wrUrb->urb->transfer_buffer_length = bytes_written + 4;
+
+ /* send the data out the bulk port */
+ /* a character device write uses GFP_KERNEL,
+ unless a spinlock is held */
+ retval = usb_submit_urb(wrUrb->urb, GFP_KERNEL);
+ if (retval) {
+ atomic_set(&wrUrb->busy, 0); /* release urb */
+ err("%s - failed submitting write urb, error %d",
+ __FUNCTION__, retval);
+ } else {
+ retval = bytes_written;
+ }
+
+exit:
+ /* unlock the device */
+ up(&card->sem);
+
+ dbg("%s - leaved", __FUNCTION__);
+
+ return retval;
+}
+
+/*
+ * callback for interrupt IN urb
+ */
+static void cpcusb_read_interrupt_callback(struct urb *urb
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19))
+ , struct pt_regs *regs
+#endif
+)
+{
+ CPC_USB_T *card = (CPC_USB_T *) urb->context;
+ int retval;
+ unsigned long flags;
+
+ spin_lock_irqsave(&card->slock, flags);
+
+ if (!card->present) {
+ spin_unlock_irqrestore(&card->slock, flags);
+ info("%s - no such device", __FUNCTION__);
+ return;
+ }
+
+ switch (urb->status) {
+ case 0: /* success */
+ card->free_slots = card->intr_in_buffer[1];
+ break;
+ case -ECONNRESET:
+ case -ENOENT:
+ case -ESHUTDOWN:
+ /* urb was killed */
+ spin_unlock_irqrestore(&card->slock, flags);
+ dbg("%s - intr urb killed", __FUNCTION__);
+ return;
+ default:
+ info("%s - nonzero urb status %d", __FUNCTION__, urb->status);
+ break;
+ }
+
+ retval = usb_submit_urb(urb, GFP_ATOMIC);
+ if (retval) {
+ err("%s - failed resubmitting intr urb, error %d",
+ __FUNCTION__, retval);
+ }
+
+ spin_unlock_irqrestore(&card->slock, flags);
+ wake_up_interruptible(card->chan->CPCWait_q);
+
+ return;
+}
+
+#define UN_SHIFT 1
+#define CPCMSG_HEADER_LEN_FIRMWARE 11
+static int inline cpcusb_unalign_and_copy_buffy(unsigned char *out,
+ unsigned char *in)
+{
+ unsigned int i, j;
+
+ for (i = 0; i < 3; i++) {
+ out[i] = in[i];
+ }
+
+ for (j = 0; j < (in[1] + (CPCMSG_HEADER_LEN_FIRMWARE - 3)); j++) {
+ out[j + i + UN_SHIFT] = in[j + i];
+ }
+
+ return i + j;
+}
+
+/*
+ * callback for bulk IN urb
+ */
+static void cpcusb_read_bulk_callback(struct urb *urb
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19))
+ , struct pt_regs *regs
+#endif
+)
+{
+ CPC_USB_T *card = (CPC_USB_T *) urb->context;
+ CPC_CHAN_T *chan;
+ unsigned char *ibuf = urb->transfer_buffer;
+ int retval, msgCnt, start, again = 0;
+ unsigned long flags;
+
+ if (!card) {
+ err("%s - device object lost", __FUNCTION__);
+ return;
+ }
+
+ spin_lock_irqsave(&card->slock, flags);
+
+ if (!card->present) {
+ spin_unlock_irqrestore(&card->slock, flags);
+ info("%s - no such device", __FUNCTION__);
+ return;
+ }
+
+ switch (urb->status) {
+ case 0: /* success */
+ break;
+ case -ECONNRESET:
+ case -ENOENT:
+ case -ESHUTDOWN:
+ /* urb was killed */
+ spin_unlock_irqrestore(&card->slock, flags);
+ dbg("%s - read urb killed", __FUNCTION__);
+ return;
+ default:
+ info("%s - nonzero urb status %d", __FUNCTION__, urb->status);
+ break;
+ }
+
+ if (urb->actual_length) {
+ msgCnt = ibuf[0] & ~0x80;
+ again = ibuf[0] & 0x80;
+
+ /* we have a 4 byte header */
+ start = 4;
+ chan = card->chan;
+ while (msgCnt) {
+ if (!(IsBufferFull(card->chan))) {
+ start +=
+ cpcusb_unalign_and_copy_buffy((unsigned char *)
+ &chan->buf[chan->iidx], &ibuf[start]);
+
+ if (start > urb->transfer_buffer_length) {
+ err("%d > %d", start, urb->transfer_buffer_length);
+ break;
+ }
+
+ chan->WnR = 0;
+ chan->iidx = (chan->iidx + 1) % CPC_MSG_BUF_CNT;
+ msgCnt--;
+ } else {
+ break;
+ }
+ }
+ }
+
+ usb_fill_bulk_urb(urb, card->udev,
+ usb_rcvbulkpipe(card->udev, card->num_bulk_in),
+ urb->transfer_buffer,
+ urb->transfer_buffer_length,
+ cpcusb_read_bulk_callback, card);
+
+ retval = usb_submit_urb(urb, GFP_ATOMIC);
+
+ if (retval) {
+ err("%s - failed resubmitting read urb, error %d", __FUNCTION__, retval);
+ }
+
+ spin_unlock_irqrestore(&card->slock, flags);
+
+ wake_up_interruptible(card->chan->CPCWait_q);
+}
+
+/*
+ * callback for bulk IN urb
+ */
+static void cpcusb_write_bulk_callback(struct urb *urb
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19))
+ , struct pt_regs *regs
+#endif
+)
+{
+ CPC_USB_T *card = (CPC_USB_T *) urb->context;
+ unsigned long flags;
+ int j;
+
+ spin_lock_irqsave(&card->slock, flags);
+
+ /* find this urb */
+ for (j = 0; j < CPC_USB_URB_CNT; j++) {
+ if (card->wrUrbs[j].urb == urb) {
+ dbg("URB found no. %d", j);
+ /* notify anyone waiting that the write has finished */
+ complete(&card->wrUrbs[j].finished);
+ atomic_set(&card->wrUrbs[j].busy, 0);
+ break;
+ }
+ }
+
+ switch (urb->status) {
+ case 0: /* success */
+ break;
+ case -ECONNRESET:
+ case -ENOENT:
+ case -ESHUTDOWN:
+ /* urb was killed */
+ spin_unlock_irqrestore(&card->slock, flags);
+ dbg("%s - write urb no. %d killed", __FUNCTION__, j);
+ return;
+ default:
+ info("%s - nonzero urb status %d", __FUNCTION__, urb->status);
+ break;
+ }
+
+ spin_unlock_irqrestore(&card->slock, flags);
+
+ wake_up_interruptible(card->chan->CPCWait_q);
+}
+
+static inline int cpcusb_get_free_slot(void)
+{
+ int i;
+
+ for (i = 0; i < CPC_USB_CARD_CNT; i++) {
+ if (!CPCUSB_Table[i])
+ return i;
+ }
+
+ return -1;
+}
+
+/*
+ * probe function for new CPC-USB devices
+ */
+static int cpcusb_probe(struct usb_interface *interface,
+ const struct usb_device_id *id)
+{
+ CPC_USB_T *card = NULL;
+ CPC_CHAN_T *chan = NULL;
+
+ struct usb_device *udev = interface_to_usbdev(interface);
+ struct usb_host_interface *iface_desc;
+ struct usb_endpoint_descriptor *endpoint;
+
+ int i, j, retval = -ENOMEM, slot;
+
+ if ((slot = cpcusb_get_free_slot()) < 0) {
+ info("No more devices supported");
+ return -ENOMEM;
+ }
+
+ /* allocate memory for our device state and initialize it */
+ card = kzalloc(sizeof(CPC_USB_T), GFP_KERNEL);
+ if (!card) {
+ err("Out of memory");
+ return -ENOMEM;
+ }
+ CPCUSB_Table[slot] = card;
+
+ /* allocate and initialize the channel struct */
+ card->chan = kmalloc(sizeof(CPC_CHAN_T), GFP_KERNEL);
+ if (!card) {
+ kfree(card);
+ err("Out of memory");
+ return -ENOMEM;
+ }
+
+ chan = card->chan;
+ memset(chan, 0, sizeof(CPC_CHAN_T));
+ ResetBuffer(chan);
+
+ init_MUTEX(&card->sem);
+ spin_lock_init(&card->slock);
+
+ card->udev = udev;
+ card->interface = interface;
+ if (udev->descriptor.iSerialNumber) {
+ usb_string(udev, udev->descriptor.iSerialNumber, card->serialNumber,
+ 128);
+ info("Serial %s", card->serialNumber);
+ }
+
+ card->productId = udev->descriptor.idProduct;
+ info("Product %s",
+ card->productId == USB_CPCUSB_LPC2119_PRODUCT_ID ?
+ "CPC-USB/ARM7" : "CPC-USB/M16C");
+
+ /* set up the endpoint information */
+ /* check out the endpoints */
+ /* use only the first bulk-in and bulk-out endpoints */
+ iface_desc = &interface->altsetting[0];
+ for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
+ endpoint = &iface_desc->endpoint[i].desc;
+
+ if (!card->num_intr_in &&
+ (endpoint->bEndpointAddress & USB_DIR_IN) &&
+ ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
+ == USB_ENDPOINT_XFER_INT)) {
+ card->intr_in_urb = usb_alloc_urb(0, GFP_KERNEL);
+ card->num_intr_in = 1;
+
+ if (!card->intr_in_urb) {
+ err("No free urbs available");
+ goto error;
+ }
+
+ dbg("intr_in urb %d", card->num_intr_in);
+ }
+
+ if (!card->num_bulk_in &&
+ (endpoint->bEndpointAddress & USB_DIR_IN) &&
+ ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
+ == USB_ENDPOINT_XFER_BULK)) {
+ card->num_bulk_in = 2;
+ for (j = 0; j < CPC_USB_URB_CNT; j++) {
+ card->urbs[j].size = endpoint->wMaxPacketSize;
+ card->urbs[j].urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (!card->urbs[j].urb) {
+ err("No free urbs available");
+ goto error;
+ }
+ card->urbs[j].buffer =
+ usb_buffer_alloc(udev,
+ card->urbs[j].size,
+ GFP_KERNEL,
+ &card->urbs[j].urb->transfer_dma);
+ if (!card->urbs[j].buffer) {
+ err("Couldn't allocate bulk_in_buffer");
+ goto error;
+ }
+ }
+ info("%s - %d reading URB's allocated",
+ __FUNCTION__, CPC_USB_URB_CNT);
+ }
+
+ if (!card->num_bulk_out &&
+ !(endpoint->bEndpointAddress & USB_DIR_IN) &&
+ ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
+ == USB_ENDPOINT_XFER_BULK)) {
+
+ card->num_bulk_out = 2;
+
+ for (j = 0; j < CPC_USB_URB_CNT; j++) {
+ card->wrUrbs[j].size =
+ endpoint->wMaxPacketSize;
+ card->wrUrbs[j].urb =
+ usb_alloc_urb(0, GFP_KERNEL);
+ if (!card->wrUrbs[j].urb) {
+ err("No free urbs available");
+ goto error;
+ }
+ card->wrUrbs[j].buffer = usb_buffer_alloc(udev,
+ card->wrUrbs[j].size, GFP_KERNEL,
+ &card->wrUrbs[j].urb->transfer_dma);
+
+ if (!card->wrUrbs[j].buffer) {
+ err("Couldn't allocate bulk_out_buffer");
+ goto error;
+ }
+
+ usb_fill_bulk_urb(card->wrUrbs[j].urb, udev,
+ usb_sndbulkpipe(udev, endpoint->bEndpointAddress),
+ card->wrUrbs[j].buffer,
+ card->wrUrbs[j].size,
+ cpcusb_write_bulk_callback,
+ card);
+ }
+
+ info("%s - %d writing URB's allocated", __FUNCTION__, CPC_USB_URB_CNT);
+ }
+ }
+
+ if (!(card->num_bulk_in && card->num_bulk_out)) {
+ err("Couldn't find both bulk-in and bulk-out endpoints");
+ goto error;
+ }
+
+ /* allow device read, write and ioctl */
+ card->present = 1;
+
+ /* we can register the device now, as it is ready */
+ usb_set_intfdata(interface, card);
+ retval = usb_register_dev(interface, &cpcusb_class);
+
+ if (retval) {
+ /* something prevented us from registering this driver */
+ err("Not able to get a minor for this device.");
+ usb_set_intfdata(interface, NULL);
+ goto error;
+ }
+
+ card->chan->minor = card->minor = interface->minor;
+
+ chan->buf = vmalloc(sizeof(CPC_MSG_T) * CPC_MSG_BUF_CNT);
+ if (chan->buf == NULL) {
+ err("Out of memory");
+ retval = -ENOMEM;
+ goto error;
+ }
+ info("Allocated memory for %d messages (%d kbytes)",
+ CPC_MSG_BUF_CNT, (sizeof(CPC_MSG_T) * CPC_MSG_BUF_CNT) / 1000);
+ memset(chan->buf, 0, sizeof(CPC_MSG_T) * CPC_MSG_BUF_CNT);
+
+ ResetBuffer(chan);
+
+ card->chan->CPCWait_q = kmalloc(sizeof(wait_queue_head_t), GFP_KERNEL);
+ if (!card->chan->CPCWait_q) {
+ err("Out of memory");
+ retval = -ENOMEM;
+ goto error;
+ }
+ init_waitqueue_head(card->chan->CPCWait_q);
+
+ CPCUSB_Table[slot] = card;
+ card->idx = slot;
+ CPCUsbCnt++;
+
+ /* let the user know what node this device is now attached to */
+ info("Device now attached to USB-%d", card->minor);
+ return 0;
+
+error:
+ for (j = 0; j < CPC_USB_URB_CNT; j++) {
+ if (card->urbs[j].buffer) {
+ usb_buffer_free(card->udev, card->urbs[j].size,
+ card->urbs[j].buffer,
+ card->urbs[j].urb->transfer_dma);
+ card->urbs[j].buffer = NULL;
+ }
+ if (card->urbs[j].urb) {
+ usb_free_urb(card->urbs[j].urb);
+ card->urbs[j].urb = NULL;
+ }
+ }
+
+ cpcusb_delete(card);
+ return retval;
+}
+
+/*
+ * called by the usb core when the device is removed from the system
+ */
+static void cpcusb_disconnect(struct usb_interface *interface)
+{
+ CPC_USB_T *card = NULL;
+ int minor, j;
+
+ /* prevent races with open() */
+ down(&disconnect_sem);
+
+ card = usb_get_intfdata(interface);
+ usb_set_intfdata(interface, NULL);
+
+ down(&card->sem);
+
+ /* prevent device read, write and ioctl */
+ card->present = 0;
+
+ minor = card->minor;
+
+ /* free all urbs and their buffers */
+ for (j = 0; j < CPC_USB_URB_CNT; j++) {
+ /* terminate an ongoing write */
+ if (atomic_read(&card->wrUrbs[j].busy)) {
+ usb_kill_urb(card->wrUrbs[j].urb);
+ wait_for_completion(&card->wrUrbs[j].finished);
+ }
+ usb_buffer_free(card->udev, card->wrUrbs[j].size,
+ card->wrUrbs[j].buffer,
+ card->wrUrbs[j].urb->transfer_dma);
+ usb_free_urb(card->wrUrbs[j].urb);
+ }
+ info("%d write URBs freed", CPC_USB_URB_CNT);
+
+ /* free all urbs and their buffers */
+ for (j = 0; j < CPC_USB_URB_CNT; j++) {
+ usb_buffer_free(card->udev, card->urbs[j].size,
+ card->urbs[j].buffer,
+ card->urbs[j].urb->transfer_dma);
+ usb_free_urb(card->urbs[j].urb);
+ }
+ info("%d read URBs freed", CPC_USB_URB_CNT);
+ usb_free_urb(card->intr_in_urb);
+
+ /* give back our minor */
+ usb_deregister_dev(interface, &cpcusb_class);
+
+ up(&card->sem);
+
+ /* if the device is opened, cpcusb_release will clean this up */
+ if (!card->open)
+ cpcusb_delete(card);
+ else
+ wake_up_interruptible(card->chan->CPCWait_q);
+
+ up(&disconnect_sem);
+
+ CPCUsbCnt--;
+ info("USB-%d now disconnected", minor);
+}
+
+static int __init CPCUsb_Init(void)
+{
+ int result, i;
+
+ info(DRIVER_DESC " v" DRIVER_VERSION);
+ info("Build on " __DATE__ " at " __TIME__);
+
+ for (i = 0; i < CPC_USB_CARD_CNT; i++)
+ CPCUSB_Table[i] = 0;
+
+ /* register this driver with the USB subsystem */
+ result = usb_register(&cpcusb_driver);
+ if (result) {
+ err("usb_register failed. Error number %d", result);
+ return result;
+ }
+
+ procDir = proc_mkdir(CPC_USB_PROC_DIR, NULL);
+ if (!procDir) {
+ err("Could not create proc entry");
+ } else {
+ procDir->owner = THIS_MODULE;
+ procEntry = create_proc_read_entry("info", 0444, procDir,
+ cpcusb_proc_read_info,
+ NULL);
+ if (!procEntry) {
+ err("Could not create proc entry %s", CPC_USB_PROC_DIR "/info");
+ remove_proc_entry(CPC_USB_PROC_DIR, NULL);
+ procDir = NULL;
+ } else {
+ procEntry->owner = THIS_MODULE;
+ }
+ }
+
+ return 0;
+}
+
+static void __exit CPCUsb_Exit(void)
+{
+ wait_event(rmmodWq, !atomic_read(&useCount));
+
+ /* deregister this driver with the USB subsystem */
+ usb_deregister(&cpcusb_driver);
+
+ if (procDir) {
+ if (procEntry)
+ remove_proc_entry("info", procDir);
+ remove_proc_entry(CPC_USB_PROC_DIR, NULL);
+ }
+}
+
+module_init(CPCUsb_Init);
+module_exit(CPCUsb_Exit);
--- /dev/null
+/*
+ * CPC CAN Interface Definitions
+ *
+ * Copyright (C) 2000-2008 EMS Dr. Thomas Wuensche
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ */
+#ifndef CPC_HEADER
+#define CPC_HEADER
+
+// the maximum length of the union members within a CPC_MSG
+// this value can be defined by the customer, but has to be
+// >= 64 bytes
+// however, if not defined before, we set a length of 64 byte
+#if !defined(CPC_MSG_LEN) || (CPC_MSG_LEN < 64)
+#undef CPC_MSG_LEN
+#define CPC_MSG_LEN 64
+#endif
+
+// check the operating system used
+#ifdef _WIN32 // running a Windows OS
+
+// define basic types on Windows platforms
+#ifdef _MSC_VER // Visual Studio
+ typedef unsigned __int8 u8;
+ typedef unsigned __int16 u16;
+ typedef unsigned __int32 u32;
+#else // Borland Compiler
+ typedef unsigned char u8;
+ typedef unsigned short u16;
+ typedef unsigned int u32;
+#endif
+ // on Windows OS we use a byte alignment of 1
+ #pragma pack(push, 1)
+
+ // set the calling conventions for the library function calls
+ #define CALL_CONV __stdcall
+#else
+ // Kernel headers already define this types
+ #ifndef __KERNEL__
+ // define basic types
+ typedef unsigned char u8;
+ typedef unsigned short u16;
+ typedef unsigned int u32;
+ #endif
+
+ // Linux does not use this calling convention
+ #define CALL_CONV
+#endif
+
+// Transmission of events from CPC interfaces to PC can be individually
+// controlled per event type. Default state is: don't transmit
+// Control values are constructed by bit-or of Subject and Action
+// and passed to CPC_Control()
+
+// Control-Values for CPC_Control() Command Subject Selection
+#define CONTR_CAN_Message 0x04
+#define CONTR_Busload 0x08
+#define CONTR_CAN_State 0x0C
+#define CONTR_SendAck 0x10
+#define CONTR_Filter 0x14
+#define CONTR_CmdQueue 0x18 // reserved, do not use
+#define CONTR_BusError 0x1C
+
+// Control Command Actions
+#define CONTR_CONT_OFF 0
+#define CONTR_CONT_ON 1
+#define CONTR_SING_ON 2
+// CONTR_SING_ON doesn't change CONTR_CONT_ON state, so it should be
+// read as: transmit at least once
+
+// defines for confirmed request
+#define DO_NOT_CONFIRM 0
+#define DO_CONFIRM 1
+
+// event flags
+#define EVENT_READ 0x01
+#define EVENT_WRITE 0x02
+
+// Messages from CPC to PC contain a message object type field.
+// The following message types are sent by CPC and can be used in
+// handlers, others should be ignored.
+#define CPC_MSG_T_RESYNC 0 // Normally to be ignored
+#define CPC_MSG_T_CAN 1 // CAN data frame
+#define CPC_MSG_T_BUSLOAD 2 // Busload message
+#define CPC_MSG_T_STRING 3 // Normally to be ignored
+#define CPC_MSG_T_CONTI 4 // Normally to be ignored
+#define CPC_MSG_T_MEM 7 // Normally not to be handled
+#define CPC_MSG_T_RTR 8 // CAN remote frame
+#define CPC_MSG_T_TXACK 9 // Send acknowledge
+#define CPC_MSG_T_POWERUP 10 // Power-up message
+#define CPC_MSG_T_CMD_NO 11 // Normally to be ignored
+#define CPC_MSG_T_CAN_PRMS 12 // Actual CAN parameters
+#define CPC_MSG_T_ABORTED 13 // Command aborted message
+#define CPC_MSG_T_CANSTATE 14 // CAN state message
+#define CPC_MSG_T_RESET 15 // used to reset CAN-Controller
+#define CPC_MSG_T_XCAN 16 // XCAN data frame
+#define CPC_MSG_T_XRTR 17 // XCAN remote frame
+#define CPC_MSG_T_INFO 18 // information strings
+#define CPC_MSG_T_CONTROL 19 // used for control of interface/driver behaviour
+#define CPC_MSG_T_CONFIRM 20 // response type for confirmed requests
+#define CPC_MSG_T_OVERRUN 21 // response type for overrun conditions
+#define CPC_MSG_T_KEEPALIVE 22 // response type for keep alive conditions
+#define CPC_MSG_T_CANERROR 23 // response type for bus error conditions
+#define CPC_MSG_T_DISCONNECTED 24 // response type for a disconnected interface
+#define CPC_MSG_T_ERR_COUNTER 25 // RX/TX error counter of CAN controller
+
+#define CPC_MSG_T_FIRMWARE 100 // response type for USB firmware download
+
+// Messages from the PC to the CPC interface contain a command field
+// Most of the command types are wrapped by the library functions and have therefore
+// normally not to be used.
+// However, programmers who wish to circumvent the library and talk directly
+// to the drivers (mainly Linux programmers) can use the following
+// command types:
+
+#define CPC_CMD_T_CAN 1 // CAN data frame
+#define CPC_CMD_T_CONTROL 3 // used for control of interface/driver behaviour
+#define CPC_CMD_T_CAN_PRMS 6 // set CAN parameters
+#define CPC_CMD_T_CLEARBUF 8 // clears input queue; this is depricated, use CPC_CMD_T_CLEAR_MSG_QUEUE instead
+#define CPC_CMD_T_INQ_CAN_PARMS 11 // inquire actual CAN parameters
+#define CPC_CMD_T_FILTER_PRMS 12 // set filter parameter
+#define CPC_CMD_T_RTR 13 // CAN remote frame
+#define CPC_CMD_T_CANSTATE 14 // CAN state message
+#define CPC_CMD_T_XCAN 15 // XCAN data frame
+#define CPC_CMD_T_XRTR 16 // XCAN remote frame
+#define CPC_CMD_T_RESET 17 // used to reset CAN-Controller
+#define CPC_CMD_T_INQ_INFO 18 // miscellanous information strings
+#define CPC_CMD_T_OPEN_CHAN 19 // open a channel
+#define CPC_CMD_T_CLOSE_CHAN 20 // close a channel
+#define CPC_CMD_T_CNTBUF 21 // this is depricated, use CPC_CMD_T_INQ_MSG_QUEUE_CNT instead
+#define CPC_CMD_T_CAN_EXIT 200 // exit the CAN (disable interrupts; reset bootrate; reset output_cntr; mode = 1)
+
+#define CPC_CMD_T_INQ_MSG_QUEUE_CNT CPC_CMD_T_CNTBUF // inquires the count of elements in the message queue
+#define CPC_CMD_T_INQ_ERR_COUNTER 25 // request the CAN controllers error counter
+#define CPC_CMD_T_CLEAR_MSG_QUEUE CPC_CMD_T_CLEARBUF // clear CPC_MSG queue
+#define CPC_CMD_T_CLEAR_CMD_QUEUE 28 // clear CPC_CMD queue
+#define CPC_CMD_T_FIRMWARE 100 // reserved, must not be used
+#define CPC_CMD_T_USB_RESET 101 // reserved, must not be used
+#define CPC_CMD_T_WAIT_NOTIFY 102 // reserved, must not be used
+#define CPC_CMD_T_WAIT_SETUP 103 // reserved, must not be used
+#define CPC_CMD_T_ABORT 255 // Normally not to be used
+
+// definitions for CPC_MSG_T_INFO
+// information sources
+#define CPC_INFOMSG_T_UNKNOWN_SOURCE 0
+#define CPC_INFOMSG_T_INTERFACE 1
+#define CPC_INFOMSG_T_DRIVER 2
+#define CPC_INFOMSG_T_LIBRARY 3
+
+// information types
+#define CPC_INFOMSG_T_UNKNOWN_TYPE 0
+#define CPC_INFOMSG_T_VERSION 1
+#define CPC_INFOMSG_T_SERIAL 2
+
+// definitions for controller types
+#define PCA82C200 1 // Philips basic CAN controller, replaced by SJA1000
+#define SJA1000 2 // Philips basic CAN controller
+#define AN82527 3 // Intel full CAN controller
+#define M16C_BASIC 4 // M16C controller running in basic CAN (not full CAN) mode
+
+// channel open error codes
+#define CPC_ERR_NO_FREE_CHANNEL -1 // no more free space within the channel array
+#define CPC_ERR_CHANNEL_ALREADY_OPEN -2 // the channel is already open
+#define CPC_ERR_CHANNEL_NOT_ACTIVE -3 // access to a channel not active failed
+#define CPC_ERR_NO_DRIVER_PRESENT -4 // no driver at the location searched by the library
+#define CPC_ERR_NO_INIFILE_PRESENT -5 // the library could not find the inifile
+#define CPC_ERR_WRONG_PARAMETERS -6 // wrong parameters in the inifile
+#define CPC_ERR_NO_INTERFACE_PRESENT -7 // 1. The specified interface is not connected
+ // 2. The interface (mostly CPC-USB) was disconnected upon operation
+#define CPC_ERR_NO_MATCHING_CHANNEL -8 // the driver couldn't find a matching channel
+#define CPC_ERR_NO_BUFFER_AVAILABLE -9 // the driver couldn't allocate buffer for messages
+#define CPC_ERR_NO_INTERRUPT -10 // the requested interrupt couldn't be claimed
+#define CPC_ERR_NO_MATCHING_INTERFACE -11 // no interface type related to this channel was found
+#define CPC_ERR_NO_RESOURCES -12 // the requested resources could not be claimed
+#define CPC_ERR_SOCKET -13 // error concerning TCP sockets
+
+// init error codes
+#define CPC_ERR_WRONG_CONTROLLER_TYPE -14 // wrong CAN controller type within initialization
+#define CPC_ERR_NO_RESET_MODE -15 // the controller could not be set into reset mode
+#define CPC_ERR_NO_CAN_ACCESS -16 // the CAN controller could not be accessed
+
+// transmit error codes
+#define CPC_ERR_CAN_WRONG_ID -20 // the provided CAN id is too big
+#define CPC_ERR_CAN_WRONG_LENGTH -21 // the provided CAN length is too long
+#define CPC_ERR_CAN_NO_TRANSMIT_BUF -22 // the transmit buffer was occupied
+#define CPC_ERR_CAN_TRANSMIT_TIMEOUT -23 // The message could not be sent within a
+ // specified time
+
+// other error codes
+#define CPC_ERR_SERVICE_NOT_SUPPORTED -30 // the requested service is not supported by the interface
+#define CPC_ERR_IO_TRANSFER -31 // a transmission error down to the driver occurred
+#define CPC_ERR_TRANSMISSION_FAILED -32 // a transmission error down to the interface occurred
+#define CPC_ERR_TRANSMISSION_TIMEOUT -33 // a timeout occurred within transmission to the interface
+#define CPC_ERR_OP_SYS_NOT_SUPPORTED -35 // the operating system is not supported
+#define CPC_ERR_UNKNOWN -40 // an unknown error ocurred (mostly IOCTL errors)
+
+#define CPC_ERR_LOADING_DLL -50 // the library 'cpcwin.dll' could not be loaded
+#define CPC_ERR_ASSIGNING_FUNCTION -51 // the specified function could not be assigned
+#define CPC_ERR_DLL_INITIALIZATION -52 // the DLL was not initialized correctly
+#define CPC_ERR_MISSING_LICFILE -55 // the file containing the licenses does not exist
+#define CPC_ERR_MISSING_LICENSE -56 // a required license was not found
+
+// CAN state bit values. Ignore any bits not listed
+#define CPC_CAN_STATE_BUSOFF 0x80
+#define CPC_CAN_STATE_ERROR 0x40
+
+// Mask to help ignore undefined bits
+#define CPC_CAN_STATE_MASK 0xc0
+
+// CAN-Message representation in a CPC_MSG
+// Message object type is CPC_MSG_T_CAN or CPC_MSG_T_RTR
+// or CPC_MSG_T_XCAN or CPC_MSG_T_XRTR
+typedef struct CPC_CAN_MSG {
+ u32 id;
+ u8 length;
+ u8 msg[8];
+} CPC_CAN_MSG_T;
+
+
+// representation of the CAN parameters for the PCA82C200 controller
+typedef struct CPC_PCA82C200_PARAMS {
+ u8 acc_code; // Acceptance-code for receive, Standard: 0
+ u8 acc_mask; // Acceptance-mask for receive, Standard: 0xff (everything)
+ u8 btr0; // Bus-timing register 0
+ u8 btr1; // Bus-timing register 1
+ u8 outp_contr; // Output-control register
+} CPC_PCA82C200_PARAMS_T;
+
+// representation of the CAN parameters for the SJA1000 controller
+typedef struct CPC_SJA1000_PARAMS {
+ u8 mode; // enables single or dual acceptance filtering
+ u8 acc_code0; // Acceptance-code for receive, Standard: 0
+ u8 acc_code1;
+ u8 acc_code2;
+ u8 acc_code3;
+ u8 acc_mask0; // Acceptance-mask for receive, Standard: 0xff (everything)
+ u8 acc_mask1;
+ u8 acc_mask2;
+ u8 acc_mask3;
+ u8 btr0; // Bus-timing register 0
+ u8 btr1; // Bus-timing register 1
+ u8 outp_contr; // Output-control register
+} CPC_SJA1000_PARAMS_T;
+
+// representation of the CAN parameters for the M16C controller
+// in basic CAN mode (means no full CAN)
+typedef struct CPC_M16C_BASIC_PARAMS {
+ u8 con0;
+ u8 con1;
+ u8 ctlr0;
+ u8 ctlr1;
+ u8 clk;
+ u8 acc_std_code0;
+ u8 acc_std_code1;
+ u8 acc_ext_code0;
+ u8 acc_ext_code1;
+ u8 acc_ext_code2;
+ u8 acc_ext_code3;
+ u8 acc_std_mask0;
+ u8 acc_std_mask1;
+ u8 acc_ext_mask0;
+ u8 acc_ext_mask1;
+ u8 acc_ext_mask2;
+ u8 acc_ext_mask3;
+} CPC_M16C_BASIC_PARAMS_T;
+
+// CAN params message representation
+typedef struct CPC_CAN_PARAMS {
+ u8 cc_type; // represents the controller type
+ union {
+ CPC_M16C_BASIC_PARAMS_T m16c_basic;
+ CPC_SJA1000_PARAMS_T sja1000;
+ CPC_PCA82C200_PARAMS_T pca82c200;
+ } cc_params;
+} CPC_CAN_PARAMS_T;
+
+// the following structures are slightly different for Windows and Linux
+// To be able to use the 'Select' mechanism with Linux the application
+// needs to know the devices file desciptor.
+// This mechanism is not implemented within Windows and the file descriptor
+// is therefore not needed
+#ifdef _WIN32
+
+// CAN init params message representation
+typedef struct CPC_INIT_PARAMS {
+ CPC_CAN_PARAMS_T canparams;
+} CPC_INIT_PARAMS_T;
+
+#else// Linux
+
+// CHAN init params representation
+typedef struct CPC_CHAN_PARAMS {
+ int fd;
+} CPC_CHAN_PARAMS_T;
+
+// CAN init params message representation
+typedef struct CPC_INIT_PARAMS {
+ CPC_CHAN_PARAMS_T chanparams;
+ CPC_CAN_PARAMS_T canparams;
+} CPC_INIT_PARAMS_T;
+
+#endif
+
+// structure for confirmed message handling
+typedef struct CPC_CONFIRM {
+ u8 result; // error code
+} CPC_CONFIRM_T;
+
+// structure for information requests
+typedef struct CPC_INFO {
+ u8 source; // interface, driver or library
+ u8 type; // version or serial number
+ char msg[CPC_MSG_LEN - 2]; // string holding the requested information
+} CPC_INFO_T;
+
+// OVERRUN ///////////////////////////////////////
+// In general two types of overrun may occur.
+// A hardware overrun, where the CAN controller
+// lost a message, because the interrupt was
+// not handled before the next messgae comes in.
+// Or a software overrun, where i.e. a received
+// message could not be stored in the CPC_MSG
+// buffer.
+
+// After a software overrun has occurred
+// we wait until we have CPC_OVR_GAP slots
+// free in the CPC_MSG buffer.
+#define CPC_OVR_GAP 10
+
+// Two types of software overrun may occur.
+// A received CAN message or a CAN state event
+// can cause an overrun.
+// Note: A CPC_CMD which would normally store
+// its result immediately in the CPC_MSG
+// queue may fail, because the message queue is full.
+// This will not generate an overrun message, but
+// will halt command execution, until this command
+// is able to store its message in the message queue.
+#define CPC_OVR_EVENT_CAN 0x01
+#define CPC_OVR_EVENT_CANSTATE 0x02
+#define CPC_OVR_EVENT_BUSERROR 0x04
+
+// If the CAN controller lost a message
+// we indicate it with the highest bit
+// set in the count field.
+#define CPC_OVR_HW 0x80
+
+// structure for overrun conditions
+typedef struct {
+ u8 event;
+ u8 count;
+} CPC_OVERRUN_T;
+
+// CAN errors ////////////////////////////////////
+// Each CAN controller type has different
+// registers to record errors.
+// Therefor a structure containing the specific
+// errors is set up for each controller here
+
+// SJA1000 error structure
+// see the SJA1000 datasheet for detailed
+// explanation of the registers
+typedef struct CPC_SJA1000_CAN_ERROR {
+ u8 ecc; // error capture code register
+ u8 rxerr; // RX error counter register
+ u8 txerr; // TX error counter register
+} CPC_SJA1000_CAN_ERROR_T;
+
+// M16C error structure
+// see the M16C datasheet for detailed
+// explanation of the registers
+typedef struct CPC_M16C_CAN_ERROR {
+ u8 tbd; // to be defined
+} CPC_M16C_CAN_ERROR_T;
+
+// structure for CAN error conditions
+#define CPC_CAN_ECODE_ERRFRAME 0x01
+typedef struct CPC_CAN_ERROR {
+ u8 ecode;
+ struct {
+ u8 cc_type; // CAN controller type
+ union {
+ CPC_SJA1000_CAN_ERROR_T sja1000;
+ CPC_M16C_CAN_ERROR_T m16c;
+ } regs;
+ } cc;
+} CPC_CAN_ERROR_T;
+
+// Structure containing RX/TX error counter.
+// This structure is used to request the
+// values of the CAN controllers TX and RX
+// error counter.
+typedef struct CPC_CAN_ERR_COUNTER {
+ u8 rx;
+ u8 tx;
+} CPC_CAN_ERR_COUNTER_T;
+
+// If this flag is set, transmissions from PC to CPC are protected against loss
+#define CPC_SECURE_TO_CPC 0x01
+
+// If this flag is set, transmissions from CPC to PC are protected against loss
+#define CPC_SECURE_TO_PC 0x02
+
+// If this flag is set, the CAN-transmit buffer is checked to be free before sending a message
+#define CPC_SECURE_SEND 0x04
+
+// If this flag is set, the transmission complete flag is checked
+// after sending a message
+// THIS IS CURRENTLY ONLY IMPLEMENTED IN THE PASSIVE INTERFACE DRIVERS
+#define CPC_SECURE_TRANSMIT 0x08
+
+// main message type used between library and application
+typedef struct CPC_MSG {
+ u8 type; // type of message
+ u8 length; // length of data within union 'msg'
+ u8 msgid; // confirmation handle
+ u32 ts_sec; // timestamp in seconds
+ u32 ts_nsec; // timestamp in nano seconds
+ union {
+ u8 generic[CPC_MSG_LEN];
+ CPC_CAN_MSG_T canmsg;
+ CPC_CAN_PARAMS_T canparams;
+ CPC_CONFIRM_T confirmation;
+ CPC_INFO_T info;
+ CPC_OVERRUN_T overrun;
+ CPC_CAN_ERROR_T error;
+ CPC_CAN_ERR_COUNTER_T err_counter;
+ u8 busload;
+ u8 canstate;
+ } msg;
+} CPC_MSG_T;
+
+#ifdef _WIN32
+#pragma pack(pop) // reset the byte alignment
+#endif
+
+#endif // CPC_HEADER
--- /dev/null
+/*
+ * CPCLIB
+ *
+ * Copyright (C) 2000-2008 EMS Dr. Thomas Wuensche
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ */
+#ifndef CPC_INT_H
+#define CPC_INT_H
+
+#include <linux/wait.h>
+
+#define CPC_MSG_BUF_CNT 1500
+
+#ifdef CONFIG_PROC_FS
+# define CPC_PROC_DIR "driver/"
+#endif
+
+#undef dbg
+#undef err
+#undef info
+
+/* Use our own dbg macro */
+#define dbg(format, arg...) do { if (debug) printk( KERN_INFO format "\n" , ## arg); } while (0)
+#define err(format, arg...) do { printk( KERN_INFO "ERROR " format "\n" , ## arg); } while (0)
+#define info(format, arg...) do { printk( KERN_INFO format "\n" , ## arg); } while (0)
+
+/* Macros help using of our buffers */
+#define IsBufferFull(x) (!(x)->WnR) && ((x)->iidx == (x)->oidx)
+#define IsBufferEmpty(x) ((x)->WnR) && ((x)->iidx == (x)->oidx)
+#define IsBufferNotEmpty(x) (!(x)->WnR) || ((x)->iidx != (x)->oidx)
+#define ResetBuffer(x) do { (x)->oidx = (x)->iidx=0; (x)->WnR = 1; } while(0);
+
+#define CPC_BufWriteAllowed ((chan->oidx != chan->iidx) || chan->WnR)
+
+typedef void (*chan_write_byte_t) (void *chan, unsigned int reg,
+ unsigned char val);
+typedef unsigned char (*chan_read_byte_t) (void *chan, unsigned int reg);
+
+typedef struct CPC_CHAN {
+ void __iomem * canBase; // base address of SJA1000
+ chan_read_byte_t read_byte; // CAN controller read access routine
+ chan_write_byte_t write_byte; // CAN controller write access routine
+ CPC_MSG_T *buf; // buffer for CPC msg
+ unsigned int iidx;
+ unsigned int oidx;
+ unsigned int WnR;
+ unsigned int minor;
+ unsigned int locked;
+ unsigned int irqDisabled;
+
+ unsigned char cpcCtrlCANMessage;
+ unsigned char cpcCtrlCANState;
+ unsigned char cpcCtrlBUSState;
+
+ unsigned char controllerType;
+
+ unsigned long ovrTimeSec;
+ unsigned long ovrTimeNSec;
+ unsigned long ovrLockedBuffer;
+ CPC_OVERRUN_T ovr;
+
+ /* for debugging only */
+ unsigned int handledIrqs;
+ unsigned int lostMessages;
+
+ unsigned int sentStdCan;
+ unsigned int sentExtCan;
+ unsigned int sentStdRtr;
+ unsigned int sentExtRtr;
+
+ unsigned int recvStdCan;
+ unsigned int recvExtCan;
+ unsigned int recvStdRtr;
+ unsigned int recvExtRtr;
+
+ wait_queue_head_t *CPCWait_q;
+
+ void *private;
+} CPC_CHAN_T;
+
+#endif
--- /dev/null
+/* Header for CPC-USB Driver ********************
+ * Copyright 1999, 2000, 2001
+ *
+ * Company: EMS Dr. Thomas Wuensche
+ * Sonnenhang 3
+ * 85304 Ilmmuenster
+ * Phone: +49-8441-490260
+ * Fax: +49-8441-81860
+ * email: support@ems-wuensche.com
+ * WWW: www.ems-wuensche.com
+ */
+
+#ifndef CPCUSB_H
+#define CPCUSB_H
+
+#undef err
+#undef dbg
+#undef info
+
+/* Use our own dbg macro */
+#define dbg(format, arg...) do { if (debug) printk(KERN_INFO "CPC-USB: " format "\n" , ## arg); } while (0)
+#define info(format, arg...) do { printk(KERN_INFO "CPC-USB: " format "\n" , ## arg); } while (0)
+#define err(format, arg...) do { printk(KERN_INFO "CPC-USB(ERROR): " format "\n" , ## arg); } while (0)
+
+#define CPC_USB_CARD_CNT 4
+
+typedef struct CPC_USB_READ_URB {
+ unsigned char *buffer; /* the buffer to send data */
+ size_t size; /* the size of the send buffer */
+ struct urb *urb; /* the urb used to send data */
+} CPC_USB_READ_URB_T;
+
+typedef struct CPC_USB_WRITE_URB {
+ unsigned char *buffer; /* the buffer to send data */
+ size_t size; /* the size of the send buffer */
+ struct urb *urb; /* the urb used to send data */
+ atomic_t busy; /* true if write urb is busy */
+ struct completion finished; /* wait for the write to finish */
+} CPC_USB_WRITE_URB_T;
+
+#define CPC_USB_URB_CNT 10
+
+typedef struct CPC_USB {
+ struct usb_device *udev; /* save off the usb device pointer */
+ struct usb_interface *interface; /* the interface for this device */
+ unsigned char minor; /* the starting minor number for this device */
+ unsigned char num_ports; /* the number of ports this device has */
+ int num_intr_in; /* number of interrupt in endpoints we have */
+ int num_bulk_in; /* number of bulk in endpoints we have */
+ int num_bulk_out; /* number of bulk out endpoints we have */
+
+ CPC_USB_READ_URB_T urbs[CPC_USB_URB_CNT];
+
+ unsigned char intr_in_buffer[4]; /* interrupt transfer buffer */
+ struct urb *intr_in_urb; /* interrupt transfer urb */
+
+ CPC_USB_WRITE_URB_T wrUrbs[CPC_USB_URB_CNT];
+
+ int open; /* if the port is open or not */
+ int present; /* if the device is not disconnected */
+ struct semaphore sem; /* locks this structure */
+
+ int free_slots; /* free send slots of CPC-USB */
+ int idx;
+
+ spinlock_t slock;
+
+ char serialNumber[128]; /* serial number */
+ int productId; /* product id to differ between M16C and LPC2119 */
+ CPC_CHAN_T *chan;
+} CPC_USB_T;
+
+#define CPCTable CPCUSB_Table
+
+#define CPC_DRIVER_VERSION "0.724"
+#define CPC_DRIVER_SERIAL "not applicable"
+
+#define OBUF_SIZE 255 // 4096
+
+/* read timeouts -- RD_NAK_TIMEOUT * RD_EXPIRE = Number of seconds */
+#define RD_NAK_TIMEOUT (10*HZ) /* Default number of X seconds to wait */
+#define RD_EXPIRE 12 /* Number of attempts to wait X seconds */
+
+#define CPC_USB_BASE_MNR 0 /* CPC-USB start at minor 0 */
+
+#endif
--- /dev/null
+#ifndef SJA2M16C_H
+#define SJA2M16C_H
+
+#include "cpc.h"
+
+#define BAUDRATE_TOLERANCE_PERCENT 1
+#define SAMPLEPOINT_TOLERANCE_PERCENT 5
+#define SAMPLEPOINT_UPPER_LIMIT 88
+
+// M16C parameters
+ typedef struct FIELD_C0CONR {
+ unsigned int brp:4;
+ unsigned int sam:1;
+ unsigned int pr:3;
+ unsigned int dummy:8;
+} FIELD_C0CONR_T;
+typedef struct FIELD_C1CONR {
+ unsigned int ph1:3;
+ unsigned int ph2:3;
+ unsigned int sjw:2;
+ unsigned int dummy:8;
+} FIELD_C1CONR_T;
+typedef union C0CONR {
+ unsigned char c0con;
+ FIELD_C0CONR_T bc0con;
+} C0CONR_T;
+typedef union C1CONR {
+ unsigned char c1con;
+ FIELD_C1CONR_T bc1con;
+} C1CONR_T;
+
+#define SJA_TSEG1 ((pParams->btr1 & 0x0f)+1)
+#define SJA_TSEG2 (((pParams->btr1 & 0x70)>>4)+1)
+#define SJA_BRP ((pParams->btr0 & 0x3f)+1)
+#define SJA_SJW ((pParams->btr0 & 0xc0)>>6)
+#define SJA_SAM ((pParams->btr1 & 0x80)>>7)
+int baudrate_m16c(int clk, int brp, int pr, int ph1, int ph2);
+int samplepoint_m16c(int brp, int pr, int ph1, int ph2);
+int SJA1000_TO_M16C_BASIC_Params(CPC_MSG_T * pMsg);
+
+#endif /* */
--- /dev/null
+/****************************************************************************
+*
+* Copyright (c) 2003,2004 by EMS Dr. Thomas Wuensche
+*
+* - All rights reserved -
+*
+* This code is provided "as is" without warranty of any kind, either
+* expressed or implied, including but not limited to the liability
+* concerning the freedom from material defects, the fitness for parti-
+* cular purposes or the freedom of proprietary rights of third parties.
+*
+*****************************************************************************
+* Module name.: cpcusb
+*****************************************************************************
+* Include file: cpc.h
+*****************************************************************************
+* Project.....: Windows Driver Development Kit
+* Filename....: sja2m16c.cpp
+* Authors.....: (GU) Gerhard Uttenthaler
+* (CS) Christian Schoett
+*****************************************************************************
+* Short descr.: converts baudrate between SJA1000 and M16C
+*****************************************************************************
+* Description.: handles the baudrate conversion from SJA1000 parameters to
+* M16C parameters
+*****************************************************************************
+* Address : EMS Dr. Thomas Wuensche
+* Sonnenhang 3
+* D-85304 Ilmmuenster
+* Tel. : +49-8441-490260
+* Fax. : +49-8441-81860
+* email: support@ems-wuensche.com
+*****************************************************************************
+* History
+*****************************************************************************
+* Version Date Auth Remark
+*
+* 01.00 ?? GU - initial release
+* 01.10 ?????????? CS - adapted to fit into the USB Windows driver
+* 02.00 18.08.2004 GU - improved the baudrate calculating algorithm
+* - implemented acceptance filtering
+* 02.10 10.09.2004 CS - adapted to fit into the USB Windows driver
+*****************************************************************************
+* ToDo's
+*****************************************************************************
+*/
+
+/****************************************************************************/
+/* I N C L U D E S
+*/
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/module.h>
+#include <linux/poll.h>
+#include <linux/smp_lock.h>
+#include <linux/completion.h>
+#include <asm/uaccess.h>
+#include <linux/usb.h>
+
+#include "cpc.h"
+#include "cpc_int.h"
+#include "cpcusb.h"
+
+#include "sja2m16c.h"
+
+/*********************************************************************/
+int baudrate_m16c(int clk, int brp, int pr, int ph1, int ph2)
+{
+ return (16000000 / (1 << clk)) / 2 / (brp + 1) / (1 + pr + 1 +
+ ph1 + 1 + ph2 +
+ 1);
+}
+
+
+/*********************************************************************/
+int samplepoint_m16c(int brp, int pr, int ph1, int ph2)
+{
+ return (100 * (1 + pr + 1 + ph1 + 1)) / (1 + pr + 1 + ph1 + 1 +
+ ph2 + 1);
+}
+
+
+/****************************************************************************
+* Function.....: SJA1000_TO_M16C_BASIC_Params
+*
+* Task.........: This routine converts SJA1000 CAN btr parameters into M16C
+* parameters based on the sample point and the error. In
+* addition it converts the acceptance filter parameters to
+* suit the M16C parameters
+*
+* Parameters...: None
+*
+* Return values: None
+*
+* Comments.....:
+*****************************************************************************
+* History
+*****************************************************************************
+* 19.01.2005 CS - modifed the conversion of SJA1000 filter params into
+* M16C params. Due to compatibility reasons with the
+* older 82C200 CAN controller the SJA1000
+****************************************************************************/
+int SJA1000_TO_M16C_BASIC_Params(CPC_MSG_T * in)
+{
+ int sjaBaudrate;
+ int sjaSamplepoint;
+ int *baudrate_error; // BRP[0..15], PR[0..7], PH1[0..7], PH2[0..7]
+ int *samplepoint_error; // BRP[0..15], PR[0..7], PH1[0..7], PH2[0..7]
+ int baudrate_error_merk;
+ int clk, brp, pr, ph1, ph2;
+ int clk_merk, brp_merk, pr_merk, ph1_merk, ph2_merk;
+ int index;
+ unsigned char acc_code0, acc_code1, acc_code2, acc_code3;
+ unsigned char acc_mask0, acc_mask1, acc_mask2, acc_mask3;
+ CPC_MSG_T * out;
+ C0CONR_T c0con;
+ C1CONR_T c1con;
+ int tmpAccCode;
+ int tmpAccMask;
+
+ // we have to convert the parameters into M16C parameters
+ CPC_SJA1000_PARAMS_T * pParams;
+
+ // check if the type is CAN parameters and if we have to convert the given params
+ if (in->type != CPC_CMD_T_CAN_PRMS
+ || in->msg.canparams.cc_type != SJA1000)
+ return 0;
+ pParams =
+ (CPC_SJA1000_PARAMS_T *) & in->msg.canparams.cc_params.sja1000;
+ acc_code0 = pParams->acc_code0;
+ acc_code1 = pParams->acc_code1;
+ acc_code2 = pParams->acc_code2;
+ acc_code3 = pParams->acc_code3;
+ acc_mask0 = pParams->acc_mask0;
+ acc_mask1 = pParams->acc_mask1;
+ acc_mask2 = pParams->acc_mask2;
+ acc_mask3 = pParams->acc_mask3;
+
+#ifdef _DEBUG_OUTPUT_CAN_PARAMS
+ info("acc_code0: %2.2Xh\n", acc_code0);
+ info("acc_code1: %2.2Xh\n", acc_code1);
+ info("acc_code2: %2.2Xh\n", acc_code2);
+ info("acc_code3: %2.2Xh\n", acc_code3);
+ info("acc_mask0: %2.2Xh\n", acc_mask0);
+ info("acc_mask1: %2.2Xh\n", acc_mask1);
+ info("acc_mask2: %2.2Xh\n", acc_mask2);
+ info("acc_mask3: %2.2Xh\n", acc_mask3);
+
+#endif /* */
+ if (!
+ (baudrate_error =
+ (int *) vmalloc(sizeof(int) * 16 * 8 * 8 * 8 * 5))) {
+ err("Could not allocate memory\n");
+ return -3;
+ }
+ if (!
+ (samplepoint_error =
+ (int *) vmalloc(sizeof(int) * 16 * 8 * 8 * 8 * 5))) {
+ err("Could not allocate memory\n");
+ vfree(baudrate_error);
+ return -3;
+ }
+ memset(baudrate_error, 0xff, sizeof(baudrate_error));
+ memset(samplepoint_error, 0xff, sizeof(baudrate_error));
+ sjaBaudrate =
+ 16000000 / 2 / SJA_BRP / (1 + SJA_TSEG1 + SJA_TSEG2);
+ sjaSamplepoint =
+ 100 * (1 + SJA_TSEG1) / (1 + SJA_TSEG1 + SJA_TSEG2);
+ if (sjaBaudrate == 0) {
+ vfree(baudrate_error);
+ vfree(samplepoint_error);
+ return -2;
+ }
+
+#ifdef _DEBUG_OUTPUT_CAN_PARAMS
+ info("\nStarting SJA CAN params\n");
+ info("-------------------------\n");
+ info("TS1 : %2.2Xh TS2 : %2.2Xh\n", SJA_TSEG1, SJA_TSEG2);
+ info("BTR0 : %2.2Xh BTR1: %2.2Xh\n", pParams->btr0,
+ pParams->btr1);
+ info("Baudrate: %d.%dkBaud\n", sjaBaudrate / 1000,
+ sjaBaudrate % 1000);
+ info("Sample P: 0.%d\n", sjaSamplepoint);
+ info("\n");
+
+#endif /* */
+ c0con.bc0con.sam = SJA_SAM;
+ c1con.bc1con.sjw = SJA_SJW;
+
+ // calculate errors for all baudrates
+ index = 0;
+ for (clk = 0; clk < 5; clk++) {
+ for (brp = 0; brp < 16; brp++) {
+ for (pr = 0; pr < 8; pr++) {
+ for (ph1 = 0; ph1 < 8; ph1++) {
+ for (ph2 = 0; ph2 < 8; ph2++) {
+ baudrate_error[index] =
+ 100 *
+ abs(baudrate_m16c
+ (clk, brp, pr, ph1,
+ ph2) -
+ sjaBaudrate) /
+ sjaBaudrate;
+ samplepoint_error[index] =
+ abs(samplepoint_m16c
+ (brp, pr, ph1,
+ ph2) -
+ sjaSamplepoint);
+
+#if 0
+ info
+ ("Baudrate : %d kBaud\n",
+ baudrate_m16c(clk,
+ brp, pr,
+ ph1,
+ ph2));
+ info
+ ("Baudrate Error: %d\n",
+ baudrate_error
+ [index]);
+ info
+ ("Sample P Error: %d\n",
+ samplepoint_error
+ [index]);
+ info
+ ("clk : %d\n",
+ clk);
+
+#endif /* */
+ index++;
+ }
+ }
+ }
+ }
+ }
+
+ // mark all baudrate_error entries which are outer limits
+ index = 0;
+ for (clk = 0; clk < 5; clk++) {
+ for (brp = 0; brp < 16; brp++) {
+ for (pr = 0; pr < 8; pr++) {
+ for (ph1 = 0; ph1 < 8; ph1++) {
+ for (ph2 = 0; ph2 < 8; ph2++) {
+ if ((baudrate_error[index]
+ >
+ BAUDRATE_TOLERANCE_PERCENT)
+ ||
+ (samplepoint_error
+ [index] >
+ SAMPLEPOINT_TOLERANCE_PERCENT)
+ ||
+ (samplepoint_m16c
+ (brp, pr, ph1,
+ ph2) >
+ SAMPLEPOINT_UPPER_LIMIT))
+ {
+ baudrate_error
+ [index] = -1;
+ } else
+ if (((1 + pr + 1 +
+ ph1 + 1 + ph2 +
+ 1) < 8)
+ ||
+ ((1 + pr + 1 +
+ ph1 + 1 + ph2 +
+ 1) > 25)) {
+ baudrate_error
+ [index] = -1;
+ }
+
+#if 0
+ else {
+ info
+ ("Baudrate : %d kBaud\n",
+ baudrate_m16c
+ (clk, brp, pr,
+ ph1, ph2));
+ info
+ ("Baudrate Error: %d\n",
+ baudrate_error
+ [index]);
+ info
+ ("Sample P Error: %d\n",
+ samplepoint_error
+ [index]);
+ }
+
+#endif /* */
+ index++;
+ }
+ }
+ }
+ }
+ }
+
+ // find list of minimum of baudrate_error within unmarked entries
+ clk_merk = brp_merk = pr_merk = ph1_merk = ph2_merk = 0;
+ baudrate_error_merk = 100;
+ index = 0;
+ for (clk = 0; clk < 5; clk++) {
+ for (brp = 0; brp < 16; brp++) {
+ for (pr = 0; pr < 8; pr++) {
+ for (ph1 = 0; ph1 < 8; ph1++) {
+ for (ph2 = 0; ph2 < 8; ph2++) {
+ if (baudrate_error[index]
+ != -1) {
+ if (baudrate_error
+ [index] <
+ baudrate_error_merk)
+ {
+ baudrate_error_merk
+ =
+ baudrate_error
+ [index];
+ brp_merk =
+ brp;
+ pr_merk =
+ pr;
+ ph1_merk =
+ ph1;
+ ph2_merk =
+ ph2;
+ clk_merk =
+ clk;
+
+#if 0
+ info
+ ("brp: %2.2Xh pr: %2.2Xh ph1: %2.2Xh ph2: %2.2Xh\n",
+ brp,
+ pr,
+ ph1,
+ ph2);
+ info
+ ("Baudrate : %d kBaud\n",
+ baudrate_m16c
+ (clk,
+ brp,
+ pr,
+ ph1,
+ ph2));
+ info
+ ("Baudrate Error: %d\n",
+ baudrate_error
+ [index]);
+ info
+ ("Sample P Error: %d\n",
+ samplepoint_error
+ [index]);
+
+#endif /* */
+ }
+ }
+ index++;
+ }
+ }
+ }
+ }
+ }
+ if (baudrate_error_merk == 100) {
+ info("ERROR: Could not convert CAN init parameter\n");
+ vfree(baudrate_error);
+ vfree(samplepoint_error);
+ return -1;
+ }
+
+ // setting m16c CAN parameter
+ c0con.bc0con.brp = brp_merk;
+ c0con.bc0con.pr = pr_merk;
+ c1con.bc1con.ph1 = ph1_merk;
+ c1con.bc1con.ph2 = ph2_merk;
+
+#ifdef _DEBUG_OUTPUT_CAN_PARAMS
+ info("\nResulting M16C CAN params\n");
+ info("-------------------------\n");
+ info("clk : %2.2Xh\n", clk_merk);
+ info("ph1 : %2.2Xh ph2: %2.2Xh\n", c1con.bc1con.ph1 + 1,
+ c1con.bc1con.ph2 + 1);
+ info("pr : %2.2Xh brp: %2.2Xh\n", c0con.bc0con.pr + 1,
+ c0con.bc0con.brp + 1);
+ info("sjw : %2.2Xh sam: %2.2Xh\n", c1con.bc1con.sjw,
+ c0con.bc0con.sam);
+ info("co1 : %2.2Xh co0: %2.2Xh\n", c1con.c1con, c0con.c0con);
+ info("Baudrate: %d.%dBaud\n",
+ baudrate_m16c(clk_merk, c0con.bc0con.brp, c0con.bc0con.pr,
+ c1con.bc1con.ph1, c1con.bc1con.ph2) / 1000,
+ baudrate_m16c(clk_merk, c0con.bc0con.brp, c0con.bc0con.pr,
+ c1con.bc1con.ph1, c1con.bc1con.ph2) % 1000);
+ info("Sample P: 0.%d\n",
+ samplepoint_m16c(c0con.bc0con.brp, c0con.bc0con.pr,
+ c1con.bc1con.ph1, c1con.bc1con.ph2));
+ info("\n");
+
+#endif /* */
+ out = in;
+ out->type = 6;
+ out->length = sizeof(CPC_M16C_BASIC_PARAMS_T) + 1;
+ out->msg.canparams.cc_type = M16C_BASIC;
+ out->msg.canparams.cc_params.m16c_basic.con0 = c0con.c0con;
+ out->msg.canparams.cc_params.m16c_basic.con1 = c1con.c1con;
+ out->msg.canparams.cc_params.m16c_basic.ctlr0 = 0x4C;
+ out->msg.canparams.cc_params.m16c_basic.ctlr1 = 0x00;
+ out->msg.canparams.cc_params.m16c_basic.clk = clk_merk;
+ out->msg.canparams.cc_params.m16c_basic.acc_std_code0 =
+ acc_code0;
+ out->msg.canparams.cc_params.m16c_basic.acc_std_code1 = acc_code1;
+
+// info("code0: 0x%2.2X, code1: 0x%2.2X\n", out->msg.canparams.cc_params.m16c_basic.acc_std_code0, out->msg.canparams.cc_params.m16c_basic.acc_std_code1);
+ tmpAccCode = (acc_code1 >> 5) + (acc_code0 << 3);
+ out->msg.canparams.cc_params.m16c_basic.acc_std_code0 =
+ (unsigned char) tmpAccCode;
+ out->msg.canparams.cc_params.m16c_basic.acc_std_code1 =
+ (unsigned char) (tmpAccCode >> 8);
+
+// info("code0: 0x%2.2X, code1: 0x%2.2X\n", out->msg.canparams.cc_params.m16c_basic.acc_std_code0, out->msg.canparams.cc_params.m16c_basic.acc_std_code1);
+ out->msg.canparams.cc_params.m16c_basic.acc_std_mask0 =
+ ~acc_mask0;
+ out->msg.canparams.cc_params.m16c_basic.acc_std_mask1 =
+ ~acc_mask1;
+
+// info("mask0: 0x%2.2X, mask1: 0x%2.2X\n", out->msg.canparams.cc_params.m16c_basic.acc_std_mask0, out->msg.canparams.cc_params.m16c_basic.acc_std_mask1);
+ tmpAccMask = ((acc_mask1) >> 5) + ((acc_mask0) << 3);
+
+// info("tmpAccMask: 0x%4.4X\n", tmpAccMask);
+ out->msg.canparams.cc_params.m16c_basic.acc_std_mask0 =
+ (unsigned char) ~tmpAccMask;
+ out->msg.canparams.cc_params.m16c_basic.acc_std_mask1 =
+ (unsigned char) ~(tmpAccMask >> 8);
+
+// info("mask0: 0x%2.2X, mask1: 0x%2.2X\n", out->msg.canparams.cc_params.m16c_basic.acc_std_mask0, out->msg.canparams.cc_params.m16c_basic.acc_std_mask1);
+ out->msg.canparams.cc_params.m16c_basic.acc_ext_code0 =
+ (unsigned char) tmpAccCode;
+ out->msg.canparams.cc_params.m16c_basic.acc_ext_code1 =
+ (unsigned char) (tmpAccCode >> 8);
+ out->msg.canparams.cc_params.m16c_basic.acc_ext_code2 = acc_code2;
+ out->msg.canparams.cc_params.m16c_basic.acc_ext_code3 = acc_code3;
+ out->msg.canparams.cc_params.m16c_basic.acc_ext_mask0 =
+ (unsigned char) ~tmpAccMask;
+ out->msg.canparams.cc_params.m16c_basic.acc_ext_mask1 =
+ (unsigned char) ~(tmpAccMask >> 8);
+ out->msg.canparams.cc_params.m16c_basic.acc_ext_mask2 =
+ ~acc_mask2;
+ out->msg.canparams.cc_params.m16c_basic.acc_ext_mask3 =
+ ~acc_mask3;
+ vfree(baudrate_error);
+ vfree(samplepoint_error);
+ return 0;
+}
+
+
projects / GitHub / LineageOS / android_kernel_samsung_universal7580.git / commitdiff