+/* usbcan.h
+ * Header file for the Linux CAN-bus driver.
+ * Written by Jan Kriz email:johen@post.cz
+ * This software is released under the GPL-License.
+ * Version lincan-0.3 17 Jul 2008
+ */
+
+#include "../include/can.h"
+#include "../include/can_sysdep.h"
+#include "../include/main.h"
+#include "../include/devcommon.h"
+#include "../include/setup.h"
+#include "../include/usbcan.h"
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20))
+ #include <linux/freezer.h>
+#endif
+#include <linux/smp_lock.h>
+
+static int usbcan_probe(struct usb_interface *interface, const struct usb_device_id *id);
+static void usbcan_disconnect(struct usb_interface *interface);
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,10))
+void release_device(struct kref *refcount);
+#else
+void release_device(struct candevice_t *candev);
+#endif
+
+volatile int usbcan_chip_count=0;
+
+/* table of devices that work with this driver */
+static struct usb_device_id usbcan_table [] = {
+ { USB_DEVICE(USBCAN_VENDOR_ID, USBCAN_PRODUCT_ID) },
+ { } /* Terminating entry */
+};
+MODULE_DEVICE_TABLE(usb, usbcan_table);
+
+static struct usb_driver usbcan_driver = {
+ .name = "usbcan",
+ .id_table = usbcan_table,
+ .probe = usbcan_probe,
+ .disconnect = usbcan_disconnect,
+};
+
+/**
+ * usbcan_request_io: - reserve io or memory range for can board
+ * @candev: pointer to candevice/board which asks for io. Field @io_addr
+ * of @candev is used in most cases to define start of the range
+ *
+ * The function usbcan_request_io() is used to reserve the io-memory. If your
+ * hardware uses a dedicated memory range as hardware control registers you
+ * will have to add the code to reserve this memory as well.
+ * %IO_RANGE is the io-memory range that gets reserved, please adjust according
+ * your hardware. Example: #define IO_RANGE 0x100 for i82527 chips or
+ * #define IO_RANGE 0x20 for sja1000 chips in basic CAN mode.
+ * Return Value: The function returns zero on success or %-ENODEV on failure
+ * File: src/usbcan.c
+ */
+int usbcan_request_io(struct candevice_t *candev)
+{
+ struct usbcan_devs *usbdevs = (struct usbcan_devs *)candev->sysdevptr.anydev;
+
+ if (!usbdevs){
+ CANMSG("USBCAN_REQUEST_IO: Cannot register usbcan while usb device is not present.\n");
+ CANMSG("USBCAN_REQUEST_IO: Usbcan registers automatically on device insertion.\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+/**
+ * usbcan_release_io - free reserved io memory range
+ * @candev: pointer to candevice/board which releases io
+ *
+ * The function usbcan_release_io() is used to free reserved io-memory.
+ * In case you have reserved more io memory, don't forget to free it here.
+ * IO_RANGE is the io-memory range that gets released, please adjust according
+ * your hardware. Example: #define IO_RANGE 0x100 for i82527 chips or
+ * #define IO_RANGE 0x20 for sja1000 chips in basic CAN mode.
+ * Return Value: The function always returns zero
+ * File: src/usbcan.c
+ */
+int usbcan_release_io(struct candevice_t *candev)
+{
+ return 0;
+}
+
+/**
+ * usbcan_reset - hardware reset routine
+ * @candev: Pointer to candevice/board structure
+ *
+ * The function usbcan_reset() is used to give a hardware reset. This is
+ * rather hardware specific so I haven't included example code. Don't forget to
+ * check the reset status of the chip before returning.
+ * Return Value: The function returns zero on success or %-ENODEV on failure
+ * File: src/usbcan.c
+ */
+int usbcan_reset(struct candevice_t *candev)
+{
+ return 0;
+}
+
+/**
+ * usbcan_init_hw_data - Initialize hardware cards
+ * @candev: Pointer to candevice/board structure
+ *
+ * The function usbcan_init_hw_data() is used to initialize the hardware
+ * structure containing information about the installed CAN-board.
+ * %RESET_ADDR represents the io-address of the hardware reset register.
+ * %NR_82527 represents the number of Intel 82527 chips on the board.
+ * %NR_SJA1000 represents the number of Philips sja1000 chips on the board.
+ * The flags entry can currently only be %CANDEV_PROGRAMMABLE_IRQ to indicate that
+ * the hardware uses programmable interrupts.
+ * Return Value: The function always returns zero
+ * File: src/usbcan.c
+ */
+int usbcan_init_hw_data(struct candevice_t *candev)
+{
+ candev->res_addr=RESET_ADDR;
+ candev->nr_82527_chips=0;
+ candev->nr_sja1000_chips=0;
+ candev->nr_all_chips=usbcan_chip_count;
+ candev->flags |= CANDEV_PROGRAMMABLE_IRQ*0;
+
+ return 0;
+}
+
+/**
+ * usbcan_init_obj_data - Initialize message buffers
+ * @chip: Pointer to chip specific structure
+ * @objnr: Number of the message buffer
+ *
+ * The function usbcan_init_obj_data() is used to initialize the hardware
+ * structure containing information about the different message objects on the
+ * CAN chip. In case of the sja1000 there's only one message object but on the
+ * i82527 chip there are 15.
+ * The code below is for a i82527 chip and initializes the object base addresses
+ * The entry @obj_base_addr represents the first memory address of the message
+ * object. In case of the sja1000 @obj_base_addr is taken the same as the chips
+ * base address.
+ * Unless the hardware uses a segmented memory map, flags can be set zero.
+ * Return Value: The function always returns zero
+ * File: src/usbcan.c
+ */
+int usbcan_init_obj_data(struct canchip_t *chip, int objnr)
+{
+ chip->msgobj[objnr]->obj_base_addr=0;
+
+ return 0;
+}
+
+/**
+ * usbcan_program_irq - program interrupts
+ * @candev: Pointer to candevice/board structure
+ *
+ * The function usbcan_program_irq() is used for hardware that uses
+ * programmable interrupts. If your hardware doesn't use programmable interrupts
+ * you should not set the @candevices_t->flags entry to %CANDEV_PROGRAMMABLE_IRQ and
+ * leave this function unedited. Again this function is hardware specific so
+ * there's no example code.
+ * Return value: The function returns zero on success or %-ENODEV on failure
+ * File: src/usbcan.c
+ */
+int usbcan_program_irq(struct candevice_t *candev)
+{
+ return 0;
+}
+
+int usbcan_register(struct hwspecops_t *hwspecops)
+{
+ hwspecops->request_io = usbcan_request_io;
+ hwspecops->release_io = usbcan_release_io;
+ hwspecops->reset = usbcan_reset;
+ hwspecops->init_hw_data = usbcan_init_hw_data;
+ hwspecops->init_chip_data = usbcan_init_chip_data;
+ hwspecops->init_obj_data = usbcan_init_obj_data;
+ hwspecops->write_register = NULL;
+ hwspecops->read_register = NULL;
+ hwspecops->program_irq = usbcan_program_irq;
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,10))
+ hwspecops->release_device = release_device;
+#endif
+ return 0;
+}
+
+// static int sja1000_report_error_limit_counter;
+
+static void usbcan_report_error(struct canchip_t *chip,
+ unsigned sr, unsigned ir, unsigned ecc)
+{
+ /*TODO : Error reporting from device */
+
+#if 0
+ if(sja1000_report_error_limit_counter>=100)
+ return;
+
+ CANMSG("Error: status register: 0x%x irq_register: 0x%02x error: 0x%02x\n",
+ sr, ir, ecc);
+
+ sja1000_report_error_limit_counter+=10;
+
+ if(sja1000_report_error_limit_counter>=100){
+ sja1000_report_error_limit_counter+=10;
+ CANMSG("Error: too many errors, reporting disabled\n");
+ return;
+ }
+
+#ifdef CONFIG_OC_LINCAN_DETAILED_ERRORS
+ CANMSG("SR: BS=%c ES=%c TS=%c RS=%c TCS=%c TBS=%c DOS=%c RBS=%c\n",
+ sr&sjaSR_BS?'1':'0',sr&sjaSR_ES?'1':'0',
+ sr&sjaSR_TS?'1':'0',sr&sjaSR_RS?'1':'0',
+ sr&sjaSR_TCS?'1':'0',sr&sjaSR_TBS?'1':'0',
+ sr&sjaSR_DOS?'1':'0',sr&sjaSR_RBS?'1':'0');
+ CANMSG("IR: BEI=%c ALI=%c EPI=%c WUI=%c DOI=%c EI=%c TI=%c RI=%c\n",
+ sr&sjaIR_BEI?'1':'0',sr&sjaIR_ALI?'1':'0',
+ sr&sjaIR_EPI?'1':'0',sr&sjaIR_WUI?'1':'0',
+ sr&sjaIR_DOI?'1':'0',sr&sjaIR_EI?'1':'0',
+ sr&sjaIR_TI?'1':'0',sr&sjaIR_RI?'1':'0');
+ if((sr&sjaIR_EI) || 1){
+ CANMSG("EI: %s %s %s\n",
+ sja1000_ecc_errc_str[(ecc&(sjaECC_ERCC1|sjaECC_ERCC0))/sjaECC_ERCC0],
+ ecc&sjaECC_DIR?"RX":"TX",
+ sja1000_ecc_seg_str[ecc&sjaECC_SEG_M]
+ );
+ }
+#endif /*CONFIG_OC_LINCAN_DETAILED_ERRORS*/
+#endif
+}
+
+
+/**
+ * usbcan_enable_configuration - enable chip configuration mode
+ * @chip: pointer to chip state structure
+ */
+int usbcan_enable_configuration(struct canchip_t *chip)
+{
+ return 0;
+}
+
+/**
+ * usbcan_disable_configuration - disable chip configuration mode
+ * @chip: pointer to chip state structure
+ */
+int usbcan_disable_configuration(struct canchip_t *chip)
+{
+ return 0;
+}
+
+/**
+ * usbcan_chip_config: - can chip configuration
+ * @chip: pointer to chip state structure
+ *
+ * This function configures chip and prepares it for message
+ * transmission and reception. The function resets chip,
+ * resets mask for acceptance of all messages by call to
+ * usbcan_extended_mask() function and then
+ * computes and sets baudrate with use of function usbcan_baud_rate().
+ * Return Value: negative value reports error.
+ * File: src/usbcan.c
+ */
+int usbcan_chip_config(struct canchip_t *chip)
+{
+ return 0;
+}
+
+/**
+ * usbcan_extended_mask: - setup of extended mask for message filtering
+ * @chip: pointer to chip state structure
+ * @code: can message acceptance code
+ * @mask: can message acceptance mask
+ *
+ * Return Value: negative value reports error.
+ * File: src/usbcan.c
+ */
+int usbcan_extended_mask(struct canchip_t *chip, unsigned long code, unsigned long mask)
+{
+ int retval;
+ struct usbcan_usb *dev=(struct usbcan_usb*)chip->chip_data;
+
+ u8 usbbuf[USBCAN_TRANSFER_SIZE];
+
+ if (!dev)
+ return -ENODEV;
+
+ *(uint32_t *)(usbbuf)=cpu_to_le32(mask);
+ *(uint32_t *)(usbbuf+4)=cpu_to_le32(code);
+
+ retval=usb_control_msg(dev->udev,
+ usb_sndctrlpipe(dev->udev, 0),
+ USBCAN_VENDOR_EXT_MASK_SET,
+ USB_TYPE_VENDOR,
+ cpu_to_le16(0), cpu_to_le16(chip->chip_idx),
+ &usbbuf, USBCAN_TRANSFER_SIZE,
+ 10000);
+ if (retval<0)
+ return -ENODEV;
+
+ retval = usb_control_msg(dev->udev,
+ usb_rcvctrlpipe(dev->udev, 0),
+ USBCAN_VENDOR_EXT_MASK_STATUS,
+ USB_TYPE_VENDOR,
+ cpu_to_le16(0), cpu_to_le16(chip->chip_idx),
+ &usbbuf, USBCAN_TRANSFER_SIZE,
+ 10000);
+
+ if (retval==1){
+ if(usbbuf[0]==1){
+ DEBUGMSG("Setting acceptance code to 0x%lx\n",(unsigned long)code);
+ DEBUGMSG("Setting acceptance mask to 0x%lx\n",(unsigned long)mask);
+ return 0;
+ }
+ }
+
+ CANMSG("Setting extended mask failed\n");
+ return -EINVAL;
+}
+
+/**
+ * usbcan_baud_rate: - set communication parameters.
+ * @chip: pointer to chip state structure
+ * @rate: baud rate in Hz
+ * @clock: frequency of sja1000 clock in Hz (ISA osc is 14318000)
+ * @sjw: synchronization jump width (0-3) prescaled clock cycles
+ * @sampl_pt: sample point in % (0-100) sets (TSEG1+1)/(TSEG1+TSEG2+2) ratio
+ * @flags: fields %BTR1_SAM, %OCMODE, %OCPOL, %OCTP, %OCTN, %CLK_OFF, %CBP
+ *
+ * Return Value: negative value reports error.
+ * File: src/usbcan.c
+ */
+int usbcan_baud_rate(struct canchip_t *chip, int rate, int clock, int sjw,
+ int sampl_pt, int flags)
+{
+ int retval;
+ struct usbcan_usb *dev=(struct usbcan_usb*)chip->chip_data;
+
+ u8 usbbuf[USBCAN_TRANSFER_SIZE];
+
+ if (!dev)
+ return -ENODEV;
+
+ *(int32_t *)(usbbuf)=cpu_to_le32(rate);
+ *(int32_t *)(usbbuf+4)=cpu_to_le32(sjw);
+ *(int32_t *)(usbbuf+8)=cpu_to_le32(sampl_pt);
+ *(int32_t *)(usbbuf+12)=cpu_to_le32(flags);
+
+ retval=usb_control_msg(dev->udev,
+ usb_sndctrlpipe(dev->udev, 0),
+ USBCAN_VENDOR_BAUD_RATE_SET,
+ USB_TYPE_VENDOR,
+ cpu_to_le16(0), cpu_to_le16(chip->chip_idx),
+ &usbbuf, USBCAN_TRANSFER_SIZE,
+ 10000);
+ if (retval<0)
+ return -ENODEV;
+
+ retval = usb_control_msg(dev->udev,
+ usb_rcvctrlpipe(dev->udev, 0),
+ USBCAN_VENDOR_BAUD_RATE_STATUS,
+ USB_TYPE_VENDOR,
+ cpu_to_le16(0), cpu_to_le16(chip->chip_idx),
+ usbbuf, USBCAN_TRANSFER_SIZE,
+ 10000);
+
+ if (retval==1){
+ if(usbbuf[0]==1)
+ return 0;
+ }
+
+ CANMSG("baud rate %d is not possible to set\n",
+ rate);
+ return -EINVAL;
+}
+
+/**
+ * usbcan_pre_read_config: - prepares message object for message reception
+ * @chip: pointer to chip state structure
+ * @obj: pointer to message object state structure
+ *
+ * Return Value: negative value reports error.
+ * Positive value indicates immediate reception of message.
+ * File: src/usbcan.c
+ */
+int usbcan_pre_read_config(struct canchip_t *chip, struct msgobj_t *obj)
+{
+ return 0;
+}
+
+#define MAX_TRANSMIT_WAIT_LOOPS 10
+/**
+ * usbcan_pre_write_config: - prepares message object for message transmission
+ * @chip: pointer to chip state structure
+ * @obj: pointer to message object state structure
+ * @msg: pointer to CAN message
+ *
+ * This function prepares selected message object for future initiation
+ * of message transmission by usbcan_send_msg() function.
+ * The CAN message data and message ID are transfered from @msg slot
+ * into chip buffer in this function.
+ * Return Value: negative value reports error.
+ * File: src/usbcan.c
+ */
+int usbcan_pre_write_config(struct canchip_t *chip, struct msgobj_t *obj,
+ struct canmsg_t *msg)
+{
+ return 0;
+}
+
+/**
+ * usbcan_send_msg: - initiate message transmission
+ * @chip: pointer to chip state structure
+ * @obj: pointer to message object state structure
+ * @msg: pointer to CAN message
+ *
+ * This function is called after usbcan_pre_write_config() function,
+ * which prepares data in chip buffer.
+ * Return Value: negative value reports error.
+ * File: src/usbcan.c
+ */
+int usbcan_send_msg(struct canchip_t *chip, struct msgobj_t *obj,
+ struct canmsg_t *msg)
+{
+ return 0;
+}
+
+/**
+ * usbcan_check_tx_stat: - checks state of transmission engine
+ * @chip: pointer to chip state structure
+ *
+ * Return Value: negative value reports error.
+ * Positive return value indicates transmission under way status.
+ * Zero value indicates finishing of all issued transmission requests.
+ * File: src/usbcan.c
+ */
+int usbcan_check_tx_stat(struct canchip_t *chip)
+{
+ struct usbcan_usb *dev=(struct usbcan_usb*)chip->chip_data;
+ if (!dev)
+ return 0;
+ if (test_bit(USBCAN_TX_PENDING,&dev->flags))
+ return 1;
+ return 0;
+}
+
+/**
+ * usbcan_set_btregs: - configures bitrate registers
+ * @chip: pointer to chip state structure
+ * @btr0: bitrate register 0
+ * @btr1: bitrate register 1
+ *
+ * Return Value: negative value reports error.
+ * File: src/usbcan.c
+ */
+int usbcan_set_btregs(struct canchip_t *chip, unsigned short btr0,
+ unsigned short btr1)
+{
+ int retval;
+ u8 buf[USBCAN_TRANSFER_SIZE];
+ struct usbcan_usb *dev=(struct usbcan_usb*)chip->chip_data;
+ uint16_t value=(btr1&0xFF)<<8 | (btr0&0xFF);
+
+ if (!dev)
+ return -ENODEV;
+
+ retval = usb_control_msg(dev->udev,
+ usb_rcvctrlpipe(dev->udev, 0),
+ USBCAN_VENDOR_SET_BTREGS,
+ USB_TYPE_VENDOR,
+ cpu_to_le16(value), cpu_to_le16(chip->chip_idx),
+ &buf, USBCAN_TRANSFER_SIZE,
+ 10000);
+
+ if (retval==1){
+ if(buf[0]==1)
+ return 0;
+ }
+ return -ENODEV;
+}
+
+/**
+ * usbcan_start_chip: - starts chip message processing
+ * @chip: pointer to chip state structure
+ *
+ * Return Value: negative value reports error.
+ * File: src/usbcan.c
+ */
+int usbcan_start_chip(struct canchip_t *chip)
+{
+ int retval;
+ u8 buf[USBCAN_TRANSFER_SIZE];
+ struct usbcan_usb *dev=(struct usbcan_usb*)chip->chip_data;
+
+ if (!dev)
+ return -ENODEV;
+
+ retval = usb_control_msg(dev->udev,
+ usb_rcvctrlpipe(dev->udev, 0),
+ USBCAN_VENDOR_START_CHIP,
+ USB_TYPE_VENDOR,
+ cpu_to_le16(0), cpu_to_le16(chip->chip_idx),
+ &buf, USBCAN_TRANSFER_SIZE,
+ 10000);
+
+ if (retval==1){
+ if(buf[0]==1)
+ return 0;
+ }
+ return -ENODEV;
+}
+
+/**
+ * usbcan_chip_queue_status: - gets queue status from usb device
+ * @chip: pointer to chip state structure
+ *
+ * Return Value: negative value reports error.
+ * 0 means queue is not full
+ * 1 means queue is full
+ * File: src/usbcan.c
+ */
+int usbcan_chip_queue_status(struct canchip_t *chip)
+{
+ int retval;
+ u8 buf[USBCAN_TRANSFER_SIZE];
+ struct usbcan_usb *dev=(struct usbcan_usb*)chip->chip_data;
+
+ if (!dev)
+ return -ENODEV;
+ retval = usb_control_msg(dev->udev,
+ usb_rcvctrlpipe(dev->udev, 0),
+ USBCAN_VENDOR_CHECK_TX_STAT,
+ USB_TYPE_VENDOR,
+ cpu_to_le16(0), cpu_to_le16(chip->chip_idx),
+ &buf, USBCAN_TRANSFER_SIZE,
+ 10000);
+
+ if (retval==1){
+ DEBUGMSG("Chip_queue_status: %d\n",buf[0]);
+ if(buf[0]==1)
+ return 0;
+ if(buf[0]==0)
+ return 1;
+ }
+ CANMSG("Chip_queue_status error: %d\n",retval);
+ return -ENODEV;
+}
+
+/**
+ * usbcan_stop_chip: - stops chip message processing
+ * @chip: pointer to chip state structure
+ *
+ * Return Value: negative value reports error.
+ * File: src/usbcan.c
+ */
+int usbcan_stop_chip(struct canchip_t *chip)
+{
+ int retval;
+ u8 buf[USBCAN_TRANSFER_SIZE];
+ struct usbcan_usb *dev=(struct usbcan_usb*)chip->chip_data;
+
+ if (!dev)
+ return -ENODEV;
+
+ retval = usb_control_msg(dev->udev,
+ usb_rcvctrlpipe(dev->udev, 0),
+ USBCAN_VENDOR_STOP_CHIP,
+ USB_TYPE_VENDOR,
+ cpu_to_le16(0), cpu_to_le16(chip->chip_idx),
+ &buf, USBCAN_TRANSFER_SIZE,
+ 10000);
+
+ if (retval==1){
+ if(buf[0]==1)
+ return 0;
+ }
+ return -ENODEV;
+}
+
+/**
+ * usbcan_register_devs: - attaches usb device data to the chip structure
+ * @chip: pointer to chip state structure
+ * @data: usb device data
+ *
+ * File: src/usbcan.c
+ */
+int usbcan_register_devs(struct canchip_t *chip,void *data){
+ struct usbcan_devs *usbdevs=(struct usbcan_devs *)data;
+ if (!usbdevs){
+ CANMSG("Bad structure given\n");
+ return -1;
+ }
+ if (chip->chip_idx>=usbdevs->count) {
+ CANMSG("Requested chip number is bigger than chip count\n");
+ return -1;
+ }
+
+ usbdevs->devs[chip->chip_idx]->chip=chip;
+ chip->chip_data=(void *)usbdevs->devs[chip->chip_idx];
+ return 0;
+}
+
+/**
+ * usbcan_attach_to_chip: - attaches to the chip, setups registers and state
+ * @chip: pointer to chip state structure
+ *
+ * Return Value: negative value reports error.
+ * File: src/usbcan.c
+ */
+int usbcan_attach_to_chip(struct canchip_t *chip)
+{
+ struct usbcan_usb *dev = (struct usbcan_usb *)chip->chip_data;
+
+ /* start kernel thread */
+ dev->comthread=can_kthread_run(usbcan_kthread, (void *)dev, "usbcan_%d",chip->chip_idx);
+
+ return 0;
+}
+
+/**
+ * usbcan_release_chip: - called before chip structure removal if %CHIP_ATTACHED is set
+ * @chip: pointer to chip state structure
+ *
+ * Return Value: negative value reports error.
+ * File: src/usbcan.c
+ */
+int usbcan_release_chip(struct canchip_t *chip)
+{
+ struct usbcan_usb *dev = (struct usbcan_usb *)chip->chip_data;
+
+ usbcan_stop_chip(chip);
+
+ /* terminate the kernel thread */
+ set_bit(USBCAN_TERMINATE,&dev->flags);
+// wake_up_process(dev->comthread);
+ can_kthread_stop(dev->comthread);
+
+ return 0;
+}
+
+/**
+ * usbcan_remote_request: - configures message object and asks for RTR message
+ * @chip: pointer to chip state structure
+ * @obj: pointer to message object structure
+ *
+ * Return Value: negative value reports error.
+ * File: src/usbcan.c
+ */
+int usbcan_remote_request(struct canchip_t *chip, struct msgobj_t *obj)
+{
+ CANMSG("usbcan_remote_request not implemented\n");
+ return -ENOSYS;
+}
+
+/**
+ * usbcan_standard_mask: - setup of mask for message filtering
+ * @chip: pointer to chip state structure
+ * @code: can message acceptance code
+ * @mask: can message acceptance mask
+ *
+ * Return Value: negative value reports error.
+ * File: src/usbcan.c
+ */
+int usbcan_standard_mask(struct canchip_t *chip, unsigned short code,
+ unsigned short mask)
+{
+ CANMSG("usbcan_standard_mask not implemented\n");
+ return -ENOSYS;
+}
+
+/**
+ * usbcan_clear_objects: - clears state of all message object residing in chip
+ * @chip: pointer to chip state structure
+ *
+ * Return Value: negative value reports error.
+ * File: src/usbcan.c
+ */
+int usbcan_clear_objects(struct canchip_t *chip)
+{
+ CANMSG("usbcan_clear_objects not implemented\n");
+ return -ENOSYS;
+}
+
+/**
+ * usbcan_config_irqs: - tunes chip hardware interrupt delivery
+ * @chip: pointer to chip state structure
+ * @irqs: requested chip IRQ configuration
+ *
+ * Return Value: negative value reports error.
+ * File: src/usbcan.c
+ */
+int usbcan_config_irqs(struct canchip_t *chip, short irqs)
+{
+ CANMSG("usbcan_config_irqs not implemented\n");
+ return -ENOSYS;
+}
+
+
+static void usbcan_usb_message_move_list(struct usbcan_usb *dev,
+ struct usbcan_message *m, struct list_head *head)
+{
+ can_spin_irqflags_t flags;
+ can_spin_lock_irqsave(&dev->list_lock, flags);
+ list_del(&m->list_node);
+ list_add_tail(&m->list_node, head);
+ can_spin_unlock_irqrestore(&dev->list_lock, flags);
+}
+
+
+/**
+ * usbcan_kthread_read_handler: - part of kthread code responsible for receive completed events
+ * @dev: pointer to usb device related structure
+ * @obj: pointer to attached message object description
+ *
+ * The main purpose of this function is to read message from usb urb
+ * and transfer message contents to CAN queue ends.
+ * This subroutine is called by
+ * usbcan_kthread().
+ * File: src/usbcan.c
+ */
+void usbcan_kthread_read_handler(struct usbcan_usb *dev, struct usbcan_message *m,
+ struct msgobj_t *obj)
+{
+ int i, len, retval;
+ u8 *ptr;
+
+ DEBUGMSG("USBCAN RX handler\n");
+
+ if (!test_and_clear_bit(USBCAN_MESSAGE_DATA_OK,&m->flags)) {
+ CANMSG("Strange, Rx handler USBCAN_MESSAGE_DATA_OK not set\n");
+ goto skip_msg;
+ }
+
+ if (!(dev->chip)||!(dev->chip->flags & CHIP_CONFIGURED)) {
+ CANMSG("Destination chip not found\n");
+ goto skip_msg;
+ }
+
+
+ DEBUGMSG("USBCAN Thread has received a message\n");
+
+ len=*(u8 *)(m->msg+1);
+ if(len > CAN_MSG_LENGTH) len = CAN_MSG_LENGTH;
+ obj->rx_msg.length = len;
+
+ obj->rx_msg.flags=le16_to_cpu(*(u16 *)(m->msg+2));
+ obj->rx_msg.id=le32_to_cpu((*(u32 *)(m->msg+4)));
+
+ for(ptr=m->msg+8,i=0; i < len; ptr++,i++) {
+ obj->rx_msg.data[i]=*ptr;
+ }
+
+ // fill CAN message timestamp
+ can_filltimestamp(&obj->rx_msg.timestamp);
+ canque_filter_msg2edges(obj->qends, &obj->rx_msg);
+
+skip_msg:
+ set_bit(USBCAN_MESSAGE_URB_PENDING,&m->flags);
+ DEBUGMSG("Renewing RX urb\n");
+
+ usbcan_usb_message_move_list(dev, m, &dev->rx_pend_list);
+ retval = usb_submit_urb (m->u, GFP_KERNEL);
+ if (retval<0) {
+ CANMSG("URB error %d\n", retval);
+ set_bit(USBCAN_ERROR,&dev->flags);
+ }
+}
+
+/**
+ * usbcan_kthread_write_handler: - part of kthread code responsible for transmit done events
+ * @dev: pointer to usb device related structure
+ * @obj: pointer to attached message object description
+ *
+ * The main purpose of this function is to free allocated resources on transmit done event
+ * This subroutine is called by
+ * usbcan_kthread().
+ * File: src/usbcan.c
+ */
+void usbcan_kthread_write_handler(struct usbcan_usb *dev, struct usbcan_message *m,
+ struct msgobj_t *obj)
+{
+ if (!test_and_clear_bit(USBCAN_MESSAGE_DATA_OK,&m->flags)) {
+ CANMSG("Strange, Tx handler USBCAN_MESSAGE_DATA_OK not set\n");
+ goto skip_msg;
+ }
+
+ DEBUGMSG("USBCAN Message successfully sent\n");
+
+ if(m->slot){
+ // Do local transmitted message distribution if enabled
+ if (processlocal){
+ // fill CAN message timestamp
+ can_filltimestamp(&m->slot->msg.timestamp);
+
+ m->slot->msg.flags |= MSG_LOCAL;
+ canque_filter_msg2edges(obj->qends, &m->slot->msg);
+ }
+ // Free transmitted slot
+ canque_free_outslot(obj->qends, m->qedge, m->slot);
+ m->slot=NULL;
+ }
+
+ /*FIXME - why there*/
+ can_msgobj_clear_fl(obj,TX_PENDING);
+
+skip_msg:
+ set_bit(USBCAN_FREE_TX_URB,&dev->flags);
+ set_bit(USBCAN_MESSAGE_FREE,&m->flags);
+
+ set_bit(USBCAN_TX_PENDING,&dev->flags);
+
+ usbcan_usb_message_move_list(dev, m, &dev->tx_idle_list);
+}
+
+/**
+ * usbcan_kthread_write_request_handler: - part of kthread code responsible for sending transmit urbs
+ * @dev: pointer to usb device related structure
+ * @obj: pointer to attached message object description
+ *
+ * The main purpose of this function is to create a usb transmit safe object
+ * and send it via free transmit usb urb
+ * This subroutine is called by
+ * usbcan_kthread().
+ * File: src/usbcan.c
+ */
+void usbcan_kthread_write_request_handler(struct usbcan_usb *dev, struct msgobj_t *obj){
+ int i, cmd, len, retval;
+ u8 *ptr;
+ struct usbcan_message *m;
+
+ if(list_empty(&dev->tx_idle_list)) {
+ clear_bit(USBCAN_FREE_TX_URB,&dev->flags);
+ return;
+ }
+
+ m = list_first_entry(&dev->tx_idle_list, typeof(*m), list_node);
+
+ cmd=canque_test_outslot(obj->qends, &m->qedge, &m->slot);
+ if(cmd>=0){
+ DEBUGMSG("USBCAN Sending a message\n");
+
+ can_msgobj_set_fl(obj,TX_PENDING);
+ clear_bit(USBCAN_FREE_TX_URB,&dev->flags);
+ clear_bit(USBCAN_MESSAGE_FREE,&m->flags);
+
+ *(u8 *)(m->msg)=0;
+ len = m->slot->msg.length;
+ if(len > CAN_MSG_LENGTH)
+ len = CAN_MSG_LENGTH;
+ *(u8 *)(m->msg+1)=len & 0xFF;
+ *(u16 *)(m->msg+2)=cpu_to_le16(m->slot->msg.flags);
+ *(u32 *)(m->msg+4)=cpu_to_le32(m->slot->msg.id);
+
+ for(ptr=m->msg+8, i=0; i < len; ptr++,i++) {
+ *ptr=m->slot->msg.data[i] & 0xFF;
+ }
+ for(; i < 8; ptr++,i++) {
+ *ptr=0;
+ }
+
+ set_bit(USBCAN_MESSAGE_URB_PENDING,&m->flags);
+
+ usbcan_usb_message_move_list(dev, m, &dev->tx_pend_list);
+
+ retval = usb_submit_urb (m->u, GFP_KERNEL);
+ if (retval){
+ CANMSG("%d. URB error %d\n",i,retval);
+ clear_bit(USBCAN_MESSAGE_URB_PENDING,&m->flags);
+ set_bit(USBCAN_FREE_TX_URB,&dev->flags);
+ set_bit(USBCAN_MESSAGE_FREE,&m->flags);
+ obj->ret = -1;
+ canque_notify_inends(m->qedge, CANQUEUE_NOTIFY_ERRTX_SEND);
+ canque_free_outslot(obj->qends, m->qedge, m->slot);
+ m->slot=NULL;
+ usbcan_usb_message_move_list(dev, m, &dev->tx_idle_list);
+ } else {
+ set_bit(USBCAN_TX_PENDING,&dev->flags);
+ }
+ } else {
+ set_bit(USBCAN_FREE_TX_URB,&dev->flags);
+ }
+}
+
+#define MAX_RETR 10
+
+/**
+ * usbcan_irq_handler: - interrupt service routine
+ * @irq: interrupt vector number, this value is system specific
+ * @chip: pointer to chip state structure
+ *
+ * Interrupt handler is activated when state of CAN controller chip changes,
+ * there is message to be read or there is more space for new messages or
+ * error occurs. The receive events results in reading of the message from
+ * CAN controller chip and distribution of message through attached
+ * message queues.
+ * File: src/usbcan.c
+ */
+int usbcan_irq_handler(int irq, struct canchip_t *chip)
+{
+ return CANCHIP_IRQ_HANDLED;
+}
+
+/**
+ * usbcan_wakeup_tx: - wakeups TX processing
+ * @chip: pointer to chip state structure
+ * @obj: pointer to message object structure
+ *
+ * Function is responsible for initiating message transmition.
+ * It is responsible for clearing of object TX_REQUEST flag
+ *
+ * Return Value: negative value reports error.
+ * File: src/usbcan.c
+ */
+int usbcan_wakeup_tx(struct canchip_t *chip, struct msgobj_t *obj)
+{
+ struct usbcan_usb *dev=(struct usbcan_usb *)chip->chip_data;
+
+ DEBUGMSG("Trying to send message\n");
+ can_preempt_disable();
+
+ can_msgobj_set_fl(obj,TX_PENDING);
+ can_msgobj_set_fl(obj,TX_REQUEST);
+ while(!can_msgobj_test_and_set_fl(obj,TX_LOCK)){
+ can_msgobj_clear_fl(obj,TX_REQUEST);
+
+ if (test_and_clear_bit(USBCAN_FREE_TX_URB,&dev->flags)){
+ obj->tx_retry_cnt=0;
+ set_bit(USBCAN_TX_PENDING,&dev->flags);
+ if (test_bit(USBCAN_THREAD_RUNNING,&dev->flags))
+ wake_up_process(dev->comthread);
+ }
+
+ can_msgobj_clear_fl(obj,TX_LOCK);
+ if(!can_msgobj_test_fl(obj,TX_REQUEST)) break;
+ CANMSG("TX looping in usbcan_wakeup_tx\n");
+ }
+
+ can_preempt_enable();
+ return 0;
+}
+
+int usbcan_chipregister(struct chipspecops_t *chipspecops)
+{
+ CANMSG("initializing usbcan chip operations\n");
+ chipspecops->chip_config=usbcan_chip_config;
+ chipspecops->baud_rate=usbcan_baud_rate;
+ chipspecops->standard_mask=usbcan_standard_mask;
+ chipspecops->extended_mask=usbcan_extended_mask;
+ chipspecops->message15_mask=usbcan_extended_mask;
+ chipspecops->clear_objects=usbcan_clear_objects;
+ chipspecops->config_irqs=usbcan_config_irqs;
+ chipspecops->pre_read_config=usbcan_pre_read_config;
+ chipspecops->pre_write_config=usbcan_pre_write_config;
+ chipspecops->send_msg=usbcan_send_msg;
+ chipspecops->check_tx_stat=usbcan_check_tx_stat;
+ chipspecops->wakeup_tx=usbcan_wakeup_tx;
+ chipspecops->remote_request=usbcan_remote_request;
+ chipspecops->enable_configuration=usbcan_enable_configuration;
+ chipspecops->disable_configuration=usbcan_disable_configuration;
+ chipspecops->attach_to_chip=usbcan_attach_to_chip;
+ chipspecops->release_chip=usbcan_release_chip;
+ chipspecops->set_btregs=usbcan_set_btregs;
+ chipspecops->start_chip=usbcan_start_chip;
+ chipspecops->stop_chip=usbcan_stop_chip;
+ chipspecops->irq_handler=usbcan_irq_handler;
+ chipspecops->irq_accept=NULL;
+ return 0;
+}
+
+/**
+ * usbcan_fill_chipspecops - fills chip specific operations
+ * @chip: pointer to chip representation structure
+ *
+ * The function fills chip specific operations for sja1000 (PeliCAN) chip.
+ *
+ * Return Value: returns negative number in the case of fail
+ */
+int usbcan_fill_chipspecops(struct canchip_t *chip)
+{
+ chip->chip_type="usbcan";
+ chip->max_objects=1;
+ usbcan_chipregister(chip->chipspecops);
+ return 0;
+}
+
+/**
+ * usbcan_init_chip_data - Initialize chips
+ * @candev: Pointer to candevice/board structure
+ * @chipnr: Number of the CAN chip on the hardware card
+ *
+ * The function usbcan_init_chip_data() is used to initialize the hardware
+ * structure containing information about the CAN chips.
+ * %CHIP_TYPE represents the type of CAN chip. %CHIP_TYPE can be "i82527" or
+ * "sja1000".
+ * The @chip_base_addr entry represents the start of the 'official' memory map
+ * of the installed chip. It's likely that this is the same as the @io_addr
+ * argument supplied at module loading time.
+ * The @clock entry holds the chip clock value in Hz.
+ * The entry @sja_cdr_reg holds hardware specific options for the Clock Divider
+ * register. Options defined in the %sja1000.h file:
+ * %sjaCDR_CLKOUT_MASK, %sjaCDR_CLK_OFF, %sjaCDR_RXINPEN, %sjaCDR_CBP, %sjaCDR_PELICAN
+ * The entry @sja_ocr_reg holds hardware specific options for the Output Control
+ * register. Options defined in the %sja1000.h file:
+ * %sjaOCR_MODE_BIPHASE, %sjaOCR_MODE_TEST, %sjaOCR_MODE_NORMAL, %sjaOCR_MODE_CLOCK,
+ * %sjaOCR_TX0_LH, %sjaOCR_TX1_ZZ.
+ * The entry @int_clk_reg holds hardware specific options for the Clock Out
+ * register. Options defined in the %i82527.h file:
+ * %iCLK_CD0, %iCLK_CD1, %iCLK_CD2, %iCLK_CD3, %iCLK_SL0, %iCLK_SL1.
+ * The entry @int_bus_reg holds hardware specific options for the Bus
+ * Configuration register. Options defined in the %i82527.h file:
+ * %iBUS_DR0, %iBUS_DR1, %iBUS_DT1, %iBUS_POL, %iBUS_CBY.
+ * The entry @int_cpu_reg holds hardware specific options for the cpu interface
+ * register. Options defined in the %i82527.h file:
+ * %iCPU_CEN, %iCPU_MUX, %iCPU_SLP, %iCPU_PWD, %iCPU_DMC, %iCPU_DSC, %iCPU_RST.
+ * Return Value: The function always returns zero
+ * File: src/usbcan.c
+ */
+int usbcan_init_chip_data(struct candevice_t *candev, int chipnr)
+{
+ struct canchip_t *chip=candev->chip[chipnr];
+
+ usbcan_fill_chipspecops(chip);
+
+ candev->chip[chipnr]->flags|=CHIP_IRQ_CUSTOM|CHIP_KEEP_DATA;
+ candev->chip[chipnr]->chip_base_addr=0;
+ candev->chip[chipnr]->clock = 0;
+
+ return 0;
+}
+
+
+/** *********************************
+ * USB related functions
+ * ********************************* */
+
+static int usbcan_sleep_thread(struct usbcan_usb *dev)
+{
+ int rc = 0;
+
+ /* Wait until a signal arrives or we are woken up */
+ for (;;) {
+ try_to_freeze();
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (signal_pending(current)) {
+ rc = -EINTR;
+ break;
+ }
+ if (
+ can_kthread_should_stop() ||
+ test_bit(USBCAN_DATA_OK,&dev->flags) ||
+ test_bit(USBCAN_TX_PENDING,&dev->flags) ||
+ test_bit(USBCAN_TERMINATE,&dev->flags) ||
+ test_bit(USBCAN_ERROR,&dev->flags)
+ )
+ break;
+ schedule();
+ }
+ __set_current_state(TASK_RUNNING);
+ return rc;
+}
+
+static void usbcan_tx_callback(struct urb *urb)
+{
+ struct usbcan_message *m = urb->context;
+ int retval;
+
+ if (!test_bit(USBCAN_THREAD_RUNNING,&m->dev->flags))
+ return;
+ if (test_bit(USBCAN_MESSAGE_TERMINATE,&m->flags))
+ return;
+
+ switch (urb->status) {
+ case 0:
+ /* success */
+ DEBUGMSG("%s > Message OK\n", __FUNCTION__);
+ set_bit(USBCAN_DATA_OK,&m->dev->flags);
+ set_bit(USBCAN_MESSAGE_DATA_OK,&m->flags);
+ DEBUGMSG("%s > TX flag set\n", __FUNCTION__);
+ set_bit(USBCAN_DATA_TX,&m->dev->flags);
+ clear_bit(USBCAN_MESSAGE_URB_PENDING,&m->flags);
+ usbcan_usb_message_move_list(m->dev, m, &m->dev->tx_ready_list);
+ if (test_bit(USBCAN_THREAD_RUNNING,&m->dev->flags))
+ wake_up_process(m->dev->comthread);
+ else
+ CANMSG("%s > USBCAN thread not running\n", __FUNCTION__);
+ return;
+ case -ECONNRESET:
+ case -ENOENT:
+ case -ESHUTDOWN:
+ /* this urb is terminated, clean up */
+ CANMSG("%s > Urb shutting down with status: %d\n", __FUNCTION__, urb->status);
+// set_bit(USBCAN_TERMINATE,&m->dev->flags);
+ set_bit(USBCAN_MESSAGE_TERMINATE,&m->flags);
+ clear_bit(USBCAN_MESSAGE_URB_PENDING,&m->flags);
+ return;
+ default:
+ //CANMSG("%s > Nonzero status received: %d\n", __FUNCTION__, urb->status);
+ break;
+ }
+
+ // Try to send urb again on non significant errors
+ retval = usb_submit_urb (urb, GFP_ATOMIC);
+ if (retval<0){
+ CANMSG("%s > Retrying urb failed with result %d\n", __FUNCTION__, retval);
+ set_bit(USBCAN_ERROR,&m->dev->flags);
+ clear_bit(USBCAN_MESSAGE_URB_PENDING,&m->flags);
+ usbcan_usb_message_move_list(m->dev, m, &m->dev->tx_ready_list);
+ if (test_bit(USBCAN_THREAD_RUNNING,&m->dev->flags))
+ wake_up_process(m->dev->comthread);
+ }
+}
+
+static void usbcan_rx_callback(struct urb *urb)
+{
+ struct usbcan_message *m = urb->context;
+ int retval;
+
+ if (!test_bit(USBCAN_THREAD_RUNNING,&m->dev->flags))
+ return;
+ if (test_bit(USBCAN_MESSAGE_TERMINATE,&m->flags))
+ return;
+
+ switch (urb->status) {
+ case 0:
+ /* success */
+ DEBUGMSG("%s > Message OK\n", __FUNCTION__);
+ set_bit(USBCAN_DATA_OK,&m->dev->flags);
+ set_bit(USBCAN_MESSAGE_DATA_OK,&m->flags);
+ DEBUGMSG("%s > RX flag set\n", __FUNCTION__);
+ set_bit(USBCAN_DATA_RX,&m->dev->flags);
+ clear_bit(USBCAN_MESSAGE_URB_PENDING,&m->flags);
+ usbcan_usb_message_move_list(m->dev, m, &m->dev->rx_ready_list);
+ if (test_bit(USBCAN_THREAD_RUNNING,&m->dev->flags))
+ wake_up_process(m->dev->comthread);
+ else
+ CANMSG("%s > USBCAN thread not running\n", __FUNCTION__);
+ return;
+ case -ECONNRESET:
+ case -ENOENT:
+ case -ESHUTDOWN:
+ /* this urb is terminated, clean up */
+ CANMSG("%s > Urb shutting down with status: %d\n", __FUNCTION__, urb->status);
+// set_bit(USBCAN_TERMINATE,&m->dev->flags);
+ set_bit(USBCAN_MESSAGE_TERMINATE,&m->flags);
+ clear_bit(USBCAN_MESSAGE_URB_PENDING,&m->flags);
+ return;
+ default:
+ //CANMSG("%s > Nonzero status received: %d\n", __FUNCTION__, urb->status);
+ break;
+ }
+
+ // Try to send urb again on non significant errors
+ retval = usb_submit_urb (urb, GFP_ATOMIC);
+ if (retval<0){
+ CANMSG("%s > Retrying urb failed with result %d\n", __FUNCTION__, retval);
+ set_bit(USBCAN_ERROR,&m->dev->flags);
+ clear_bit(USBCAN_MESSAGE_URB_PENDING,&m->flags);
+ usbcan_usb_message_move_list(m->dev, m, &m->dev->rx_ready_list);
+ if (test_bit(USBCAN_THREAD_RUNNING,&m->dev->flags))
+ wake_up_process(m->dev->comthread);
+ }
+}
+
+
+static void usbcan_kthread_free_urbs(struct usbcan_usb *dev)
+{
+ while(!list_empty(&dev->rx_pend_list)) {
+ struct usbcan_message *m;
+ m = list_first_entry(&dev->rx_pend_list, typeof(*m), list_node);
+ set_bit(USBCAN_MESSAGE_TERMINATE,&m->flags);
+ usb_kill_urb(m->u);
+ usbcan_usb_message_move_list(dev, m, &dev->rx_ready_list);
+ }
+
+ while(!list_empty(&dev->tx_pend_list)) {
+ struct usbcan_message *m;
+ m = list_first_entry(&dev->tx_pend_list, typeof(*m), list_node);
+ set_bit(USBCAN_MESSAGE_TERMINATE,&m->flags);
+ usb_kill_urb(m->u);
+ usbcan_usb_message_move_list(dev, m, &dev->tx_idle_list);
+ }
+
+ while(!list_empty(&dev->rx_ready_list)) {
+ struct usbcan_message *m;
+ m = list_first_entry(&dev->rx_ready_list, typeof(*m), list_node);
+ list_del(&m->list_node);
+ usb_free_urb(m->u);
+ kfree(m);
+ }
+
+ while(!list_empty(&dev->tx_ready_list)) {
+ struct usbcan_message *m;
+ m = list_first_entry(&dev->tx_ready_list, typeof(*m), list_node);
+ list_del(&m->list_node);
+ usb_free_urb(m->u);
+ kfree(m);
+ }
+
+ while(!list_empty(&dev->tx_idle_list)) {
+ struct usbcan_message *m;
+ m = list_first_entry(&dev->tx_idle_list, typeof(*m), list_node);
+ list_del(&m->list_node);
+ usb_free_urb(m->u);
+ kfree(m);
+ }
+
+}
+
+int usbcan_kthread(void *data)
+{
+ int i,retval=0;
+ struct usbcan_usb *dev=(struct usbcan_usb *)data;
+ struct msgobj_t *obj;
+
+ CANMSG("Usbcan thread started...\n");
+
+ if (!dev->chip)
+ goto error;
+ obj=dev->chip->msgobj[0];
+
+ INIT_LIST_HEAD(&dev->rx_pend_list);
+ INIT_LIST_HEAD(&dev->rx_ready_list);
+ INIT_LIST_HEAD(&dev->tx_idle_list);
+ INIT_LIST_HEAD(&dev->tx_pend_list);
+ INIT_LIST_HEAD(&dev->tx_ready_list);
+
+ if (1) {
+ struct sched_param param = { .sched_priority = 1 };
+ sched_setscheduler(current, SCHED_FIFO, ¶m);
+ }
+
+
+ /* Prepare receive urbs */
+ for (i=0;i<USBCAN_TOT_RX_URBS;i++){
+ struct usbcan_message *m;
+ struct urb *u = usb_alloc_urb(0, GFP_KERNEL);
+ if (!u){
+ CANMSG("Error allocating %d. usb receive urb\n",i);
+ goto error;
+ }
+ m = kmalloc(sizeof(struct usbcan_message), GFP_KERNEL);
+ if(!m) {
+ usb_free_urb(u);
+ CANMSG("Error allocating %d. receive usbcan_message\n",i);
+ goto error;
+ }
+ m->u = u;
+ u->dev = dev->udev;
+ m->dev = dev;
+ usb_fill_bulk_urb(u, dev->udev,
+ usb_rcvbulkpipe(dev->udev, dev->bulk_in_endpointAddr),
+ m->msg, USBCAN_TRANSFER_SIZE, usbcan_rx_callback, m);
+ set_bit(USBCAN_MESSAGE_TYPE_RX, &m->flags);
+ list_add_tail(&m->list_node, &dev->rx_ready_list);
+ }
+
+ /* Prepare transmit urbs */
+ for (i=0;i<USBCAN_TOT_TX_URBS;i++){
+ struct usbcan_message *m;
+ struct urb *u = usb_alloc_urb(0, GFP_KERNEL);
+ if (!u){
+ CANMSG("Error allocating %d. usb transmit urb\n",i);
+ goto error;
+ }
+ m = kmalloc(sizeof(struct usbcan_message), GFP_KERNEL);
+ if(!m) {
+ usb_free_urb(u);
+ CANMSG("Error allocating %d. transmit usbcan_message\n",i);
+ goto error;
+ }
+ m->u = u;
+ u->dev = dev->udev;
+ m->dev = dev;
+ usb_fill_bulk_urb(u, dev->udev,
+ usb_sndbulkpipe(dev->udev, dev->bulk_out_endpointAddr),
+ m->msg, USBCAN_TRANSFER_SIZE, usbcan_tx_callback, m);
+
+ set_bit(USBCAN_MESSAGE_FREE,&m->flags);
+ set_bit(USBCAN_MESSAGE_TYPE_TX,&m->flags);
+ list_add_tail(&m->list_node, &dev->tx_idle_list);
+
+ }
+
+ set_bit(USBCAN_THREAD_RUNNING,&dev->flags);
+ set_bit(USBCAN_FREE_TX_URB,&dev->flags);
+
+ for (i=0;i<USBCAN_TOT_RX_URBS;i++){
+ struct usbcan_message *m;
+ m = list_first_entry(&dev->rx_ready_list, typeof(*m), list_node);
+ set_bit(USBCAN_MESSAGE_URB_PENDING,&m->flags);
+ usbcan_usb_message_move_list(dev, m, &dev->rx_pend_list);
+
+ retval=usb_submit_urb(m->u, GFP_KERNEL);
+ if (retval){
+ CANMSG("%d. URB error %d\n",i,retval);
+ set_bit(USBCAN_ERROR,&dev->flags);
+ usbcan_usb_message_move_list(dev, m, &dev->rx_ready_list);
+ goto exit;
+ }
+ }
+ /* an endless loop in which we are doing our work */
+ for(;;)
+ {
+ /* We need to do a memory barrier here to be sure that
+ the flags are visible on all CPUs. */
+ mb();
+ /* fall asleep */
+ if (!can_kthread_should_stop() && !test_bit(USBCAN_TERMINATE,&dev->flags) && (usbcan_sleep_thread(dev)<0)){
+ break;
+ }
+ /* We need to do a memory barrier here to be sure that the flags are visible on all CPUs. */
+ mb();
+
+ if (can_kthread_should_stop() || test_bit(USBCAN_TERMINATE,&dev->flags)){
+ break;
+ }
+
+ clear_bit(USBCAN_DATA_OK,&dev->flags);
+
+ mb();
+
+ while(!list_empty(&dev->rx_ready_list)) {
+ struct usbcan_message *m;
+ m = list_first_entry(&dev->rx_ready_list, typeof(*m), list_node);
+ usbcan_kthread_read_handler(dev, m, obj);
+ }
+
+ while(!list_empty(&dev->tx_ready_list)) {
+ struct usbcan_message *m;
+ m = list_first_entry(&dev->tx_ready_list, typeof(*m), list_node);
+ usbcan_kthread_write_handler(dev, m, obj);
+ }
+
+ if (test_and_clear_bit(USBCAN_TX_PENDING,&dev->flags)) {
+ usbcan_kthread_write_request_handler(dev, obj);
+ }
+ }
+
+ set_bit(USBCAN_TERMINATE,&dev->flags);
+exit:
+
+ usbcan_kthread_free_urbs(dev);
+ clear_bit(USBCAN_THREAD_RUNNING,&dev->flags);
+
+ CANMSG ("usbcan thread finished!\n");
+ return 0;
+error:
+ /* cleanup the thread, leave */
+ usbcan_kthread_free_urbs(dev);
+
+ CANMSG ("kernel thread terminated!\n");
+ return -ENOMEM;
+}
+
+static int usbcan_probe(struct usb_interface *interface, const struct usb_device_id *id)
+{
+ struct usbcan_devs *usbdevs=NULL;
+ struct usb_host_interface *iface_desc;
+ struct usb_endpoint_descriptor *endpoint;
+ size_t buffer_size;
+ int i,j,k;
+ int retval = -ENOMEM;
+
+ iface_desc = interface->cur_altsetting;
+ if (iface_desc->desc.bNumEndpoints % 2){
+ CANMSG("Endpoint count must be even");
+ goto noalloc;
+ }
+
+ usbcan_chip_count = iface_desc->desc.bNumEndpoints / 2;
+
+ usbdevs = (struct usbcan_devs *) can_checked_malloc(sizeof(struct usbcan_devs));
+ if (!usbdevs) {
+ goto noalloc;
+ }
+ memset(usbdevs, 0, sizeof(struct usbcan_devs));
+
+ usbdevs->count = usbcan_chip_count;
+ usbdevs->udev = interface_to_usbdev(interface);
+
+ usbdevs->devs = (struct usbcan_usb **) can_checked_malloc(usbcan_chip_count * sizeof(struct usbcan_usb *));
+ if (!usbdevs->devs) {
+ goto error;
+ }
+ memset(usbdevs->devs, 0, usbcan_chip_count * sizeof(struct usbcan_usb *));
+
+ for (j=0;j<usbcan_chip_count;j++){
+ struct usbcan_usb *dev;
+ int epnum=-1,was;
+
+ /* allocate memory for our device state and initialize it */
+ usbdevs->devs[j] = (struct usbcan_usb *) can_checked_malloc(sizeof(struct usbcan_usb));
+ if (!usbdevs->devs[j]) {
+ goto error;
+ }
+ memset(usbdevs->devs[j], 0, sizeof(struct usbcan_usb));
+ dev=usbdevs->devs[j];
+ spin_lock_init(&dev->list_lock);
+
+ mutex_init(&dev->io_mutex);
+ init_waitqueue_head(&dev->queue);
+ dev->udev = usbdevs->udev;
+ dev->interface = interface;
+
+ /* set up the endpoint information */
+ for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
+ endpoint = &iface_desc->endpoint[i].desc;
+
+ if (epnum==-1){
+ was=0;
+ for (k=0;k<j;k++){
+ if ((usbdevs->devs[k]->bulk_in_endpointAddr & USB_ENDPOINT_NUMBER_MASK) == (endpoint->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK))
+ was=1;
+ }
+ if (was) continue;
+ epnum=endpoint->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
+ }
+
+ if (!dev->bulk_in_endpointAddr &&
+ usb_endpoint_is_bulk_in(endpoint)) {
+ if (epnum == (endpoint->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK)){
+ /* we found a bulk in endpoint */
+ buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
+ dev->bulk_in_size = buffer_size;
+ dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
+ dev->bulk_in_buffer = can_checked_malloc(buffer_size);
+ if (!dev->bulk_in_buffer) {
+ CANMSG("Could not allocate bulk_in_buffer");
+ goto error;
+ }
+ }
+ }
+
+ if (!dev->bulk_out_endpointAddr &&
+ usb_endpoint_is_bulk_out(endpoint)) {
+ if (epnum == (endpoint->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK)){
+ /* we found a bulk out endpoint */
+ dev->bulk_out_endpointAddr = endpoint->bEndpointAddress;
+ }
+ }
+
+ }
+ if (!(dev->bulk_in_endpointAddr && dev->bulk_out_endpointAddr)) {
+ CANMSG("Could not find all bulk-in and bulk-out endpoints for chip %d",j);
+ goto error;
+ }
+ }
+
+ usb_get_dev(usbdevs->udev);
+
+ /* save our data pointer in this interface device */
+ usb_set_intfdata(interface, usbdevs);
+
+ usbdevs->candev=register_hotplug_dev("usbcan", usbcan_register_devs,(void *) usbdevs);
+ if (!(usbdevs->candev)){
+ CANMSG("register_hotplug_dev() failed\n");
+ goto register_error;
+ }
+
+ /* let the user know what node this device is now attached to */
+ CANMSG("USBCAN device now attached\n");
+ return 0;
+
+register_error:
+// cleanup_hotplug_dev(usbdevs->candev);
+ usb_put_dev(usbdevs->udev);
+error:
+ if (usbdevs){
+ if (usbdevs->devs){
+ for (j=0;j<usbdevs->count;j++){
+ if (!usbdevs->devs[j]) continue;
+
+ if (usbdevs->devs[j]->bulk_in_buffer)
+ can_checked_free(usbdevs->devs[j]->bulk_in_buffer);
+ if (usbdevs->devs[j]->chip){
+ usbdevs->devs[j]->chip->chip_data=NULL;
+ }
+ can_checked_free(usbdevs->devs[j]);
+ }
+ can_checked_free(usbdevs->devs);
+ }
+ can_checked_free(usbdevs);
+ }
+noalloc:
+ return retval;
+}
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,10))
+void release_device(struct kref *refcount){
+ struct candevice_t *candev = container_of(refcount,struct candevice_t,refcount);
+#else
+void release_device(struct candevice_t *candev){
+#endif
+ struct usbcan_devs *usbdevs = (struct usbcan_devs *)candev->sysdevptr.anydev;
+ int j;
+
+ if (!usbdevs)
+ return;
+
+ cleanup_hotplug_dev(usbdevs->candev);
+
+ if (usbdevs->devs){
+ /* Finally, release all structures in USB subsystem */
+ if (!usbdevs->udev)
+ panic("udev is already null on device release");
+ usb_put_dev(usbdevs->udev);
+
+ for (j=0;j<usbdevs->count;j++){
+ if (!usbdevs->devs[j]) continue;
+
+ if (usbdevs->devs[j]->bulk_in_buffer)
+ can_checked_free(usbdevs->devs[j]->bulk_in_buffer);
+ can_checked_free(usbdevs->devs[j]);
+ usbdevs->devs[j]=NULL;
+ }
+ can_checked_free(usbdevs->devs);
+ }
+ can_checked_free(usbdevs);
+
+ CANMSG("USBCAN now disconnected\n");
+}
+
+// Physically disconnected device
+static void usbcan_disconnect(struct usb_interface *interface)
+{
+ struct usbcan_devs *usbdevs;
+ int j;
+
+ /* prevent more I/O from starting */
+ lock_kernel();
+
+ usbdevs = usb_get_intfdata(interface);
+ if (usbdevs==NULL){
+ CANMSG("USBCAN device seems to be already removed\n");
+ unlock_kernel();
+ return;
+ }
+ usb_set_intfdata(interface, NULL);
+ deregister_hotplug_dev(usbdevs->candev);
+
+ for (j=0;j<usbdevs->count;j++){
+ if (!usbdevs->devs[j]) continue;
+ mutex_lock(&usbdevs->devs[j]->io_mutex);
+ usbdevs->devs[j]->interface = NULL;
+ mutex_unlock(&usbdevs->devs[j]->io_mutex);
+ }
+
+ unlock_kernel();
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,10))
+ kref_put(&usbdevs->candev->refcount,release_device);
+#else
+ release_device(&usbdevs->candev);
+#endif
+}
+
+int usbcan_init(void){
+ return usb_register(&usbcan_driver);
+}
+
+void usbcan_exit(void){
+ usb_deregister(&usbcan_driver);
+}
projects / lincan.git / blobdiff