// lpc17xx debug
#define USBCAN_VENDOR_SET_CANBTR (9)
-#define CTU_USBCAN_CAN_CLOCK 18000000
+#define USBCAN_VENDOR_GET_BITTIMING_CONST (10)
// lpc17xx debug - end
#define CTU_USBCAN_VENDOR_ID 0x1669
#define CTU_USBCAN_PRODUCT_ID 0x1011
-#define USBCAN_TOT_RX_URBS 8
-#define USBCAN_TOT_TX_URBS 8
+#define USBCAN_TOT_RX_URBS 8
+#define USBCAN_TOT_TX_URBS 8
-#define USBCAN_TRANSFER_SIZE 16
+#define USBCAN_TRANSFER_SIZE 16
+#define USBCAN_BITTIMING_SIZE 16
+#define USBCAN_BITTIMING_CONST_SIZE 36
-#define CAN_MSG_LENGTH 8
+#define CAN_MSG_LENGTH 8
-#define MSG_RTR (1<<0)
+#define MSG_RTR (1<<0)
#define MSG_OVR (1<<1)
#define MSG_EXT (1<<2)
#define MSG_LOCAL (1<<3)
-
#define USBCAN_DATA_OK (1)
#define USBCAN_TX_PENDING (2)
+#define USBCAN_BITTIMING_CONST_SET (3)
+
MODULE_LICENSE("GPL");
*/
-
/* Structure to hold all of our device specific stuff */
struct ctu_usbcan_usb {
struct can_priv can; /* must be the first member */
+ struct can_bittiming_const cbc;
+ u32 can_clock;
+
struct usb_device *udev; /* the usb device for this device */
struct net_device *netdev;
}
+static int get_bittiming_constants(struct ctu_usbcan_usb *dev)
+{
+
+ int retval;
+ u8 *usbbuf;
+ u32 * ptr;
+
+ usbbuf = kzalloc(sizeof(u8)*USBCAN_BITTIMING_CONST_SIZE, GFP_KERNEL);
+
+ if(!usbbuf){
+ err("Error allocating receive buffer for bittiming constants\n");
+ return 1;
+ }
+
+ retval = usb_control_msg(dev->udev,
+ usb_rcvctrlpipe(dev->udev, 0),
+ USBCAN_VENDOR_GET_BITTIMING_CONST,
+ USB_TYPE_VENDOR,
+ cpu_to_le16(0), cpu_to_le16(0),
+ usbbuf, USBCAN_BITTIMING_CONST_SIZE,
+ 1000);
+
+ if(retval<0)
+ goto exit;
+
+ ptr = (u32*) usbbuf;
+
+ dev->can_clock = le32_to_cpu(*(ptr++));
+ dev->cbc.tseg1_min = le32_to_cpu(*(ptr++));
+ dev->cbc.tseg1_max = le32_to_cpu(*(ptr++));
+ dev->cbc.tseg2_min = le32_to_cpu(*(ptr++));
+ dev->cbc.tseg2_max = le32_to_cpu(*(ptr++));
+ dev->cbc.sjw_max = le32_to_cpu(*(ptr++));
+ dev->cbc.brp_min = le32_to_cpu(*(ptr++));
+ dev->cbc.brp_max = le32_to_cpu(*(ptr++));
+ dev->cbc.brp_inc = le32_to_cpu(*(ptr));
+
+ set_bit(USBCAN_BITTIMING_CONST_SET,&dev->flags);
+
+
+exit:
+
+ kfree(usbbuf);
+ if(retval<0)
+ return retval;
+
+ return 0;
+
+}
+
+static int ctu_usbcan_set_mode(struct net_device *netdev, enum can_mode mode)
+{
+
+ printk("SET MODE\n");
+
+ return 0;
+}
+
+static int ctu_usbcan_set_bittiming(struct net_device *netdev)
+{
+ struct ctu_usbcan_usb *dev = netdev_priv(netdev);
+ struct can_bittiming *bt = &dev->can.bittiming;
+ u8 *usbbuf;
+ u32 * ptr;
+ int retval;
+
+
+ if (!dev)
+ return -ENODEV;
+
+
+ usbbuf = kzalloc(sizeof(u8)*USBCAN_BITTIMING_SIZE, GFP_KERNEL);
+
+ if(!usbbuf){
+ err("Error allocating transmit buffer for set bittiming\n");
+ return 1;
+ }
+
+ ptr = (u32*) usbbuf;
+
+ *(ptr++)=cpu_to_le32(bt->brp); // baudrate prescaler
+ *(ptr++)=cpu_to_le32(bt->sjw); // sjw
+ *(ptr++)=cpu_to_le32(bt->prop_seg + bt->phase_seg1); // TSEG1
+ *(ptr)=cpu_to_le32(bt->phase_seg2); // TSEG2
+
+
+ retval = usb_control_msg(dev->udev,
+ usb_sndctrlpipe(dev->udev, 0),
+ USBCAN_VENDOR_SET_CANBTR,
+ USB_TYPE_VENDOR,
+ cpu_to_le16(0), cpu_to_le16(0),
+ usbbuf, USBCAN_BITTIMING_SIZE,
+ 1000);
+
+ kfree(usbbuf);
+
+ if(retval){
+ printk("BITRATE %d, BRP: %d, SJW: %d, TSEG1: %d, TSEG2: %d \n", bt->bitrate, bt->brp, bt->sjw,\
+ (bt->prop_seg + bt->phase_seg1), bt->phase_seg2);
+ return 0;
+ }
+ else{
+ err("Could not set bittiming\n");
+ return retval;
+ }
+
+}
+
+
static void ctu_usbcan_tx_callback(struct urb *urb){
struct usbcan_message *m = urb->context;
exit:
usbcan_kthread_free_urbs(dev);
- printk("CTU USBCAN: usbcan thread finished!");
+ printk("CTU USBCAN: usbcan thread finished\n");
return 0;
.ndo_start_xmit = ctu_usbcan_start_xmit,
};
-static struct can_bittiming_const ctu_usbcan_bittiming_const = {
- .name = "lpc17xx_can",
- .tseg1_min = 1,
- .tseg1_max = 16,
- .tseg2_min = 1,
- .tseg2_max = 8,
- .sjw_max = 4,
- .brp_min = 1,
- .brp_max = 1024,
- .brp_inc = 1,
-};
-
-static int ctu_usbcan_set_mode(struct net_device *netdev, enum can_mode mode)
-{
- struct ems_usb *dev = netdev_priv(netdev);
-
- printk("SET MODE\n");
-
- return 0;
-}
-
-static int ctu_usbcan_set_bittiming(struct net_device *netdev)
-{
- struct ctu_usbcan_usb *dev = netdev_priv(netdev);
- struct can_bittiming *bt = &dev->can.bittiming;
- int retval;
-
- u8 usbbuf[USBCAN_TRANSFER_SIZE];
-
- printk("BRP: %d, SJW: %d, TSEG1: %d, TSEG2: %d - ", bt->brp, bt->sjw, ( bt->prop_seg + bt->phase_seg1), bt->phase_seg2);
-
-
- if (!dev)
- return -ENODEV;
-
- *(uint32_t *)(usbbuf)=cpu_to_le32(bt->brp); // baudrate prescaler
- *(uint32_t *)(usbbuf+4)=cpu_to_le32(bt->sjw); // sjw
- *(uint32_t *)(usbbuf+8)=cpu_to_le32(bt->prop_seg + bt->phase_seg1); // TSEG1
- *(uint32_t *)(usbbuf+12)=cpu_to_le32(bt->phase_seg2); // TSEG2
-
- retval = usb_control_msg(dev->udev,
- usb_sndctrlpipe(dev->udev, 0),
- USBCAN_VENDOR_SET_CANBTR,
- USB_TYPE_VENDOR,
- cpu_to_le16(0), cpu_to_le16(0),
- &usbbuf, USBCAN_TRANSFER_SIZE,
- 1000);
-
- if(retval){
- printk("OK\n");
- return 0;
- }
- else{
- printk("KO\n");
- return retval;
- }
-
-}
-
static int ctu_usbcan_probe(struct usb_interface *intf,
const struct usb_device_id *id)
dev->udev = interface_to_usbdev(intf);
dev->netdev = netdev;
- dev->can.clock.freq = CTU_USBCAN_CAN_CLOCK;
- dev->can.bittiming_const = &ctu_usbcan_bittiming_const;
- dev->can.do_set_bittiming = ctu_usbcan_set_bittiming;
- dev->can.do_set_mode = ctu_usbcan_set_mode;
-
netdev->netdev_ops = &ctu_usbcan_netdev_ops;
netdev->flags |= IFF_ECHO;
usb_set_intfdata(intf, dev);
SET_NETDEV_DEV(netdev, &intf->dev);
+ if (get_bittiming_constants(dev)){
+ err("Could not get bittiming constants\n");
+ goto exit;
+ }
+
+ dev->can.clock.freq = dev->can_clock;
+ dev->can.bittiming_const = &dev->cbc;
+ dev->can.do_set_bittiming = ctu_usbcan_set_bittiming;
+ dev->can.do_set_mode = ctu_usbcan_set_mode;
+
err = register_candev(netdev);
if (err) {
usb_set_intfdata(intf, NULL);
if (dev) {
- unregister_netdev(dev->netdev);
+ if(test_bit(USBCAN_BITTIMING_CONST_SET,&dev->flags))
+ unregister_netdev(dev->netdev);
+
free_candev(dev->netdev);
+ clear_bit(USBCAN_BITTIMING_CONST_SET,&dev->flags);
}
}
projects / socketcan-devel.git / commitdiff