| /* |
| * CAN driver for PEAK System USB adapters |
| * Derived from the PCAN project file driver/src/pcan_usb_core.c |
| * |
| * Copyright (C) 2003-2010 PEAK System-Technik GmbH |
| * Copyright (C) 2010-2012 Stephane Grosjean <s.grosjean@peak-system.com> |
| * |
| * Many thanks to Klaus Hitschler <klaus.hitschler@gmx.de> |
| * |
| * 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. |
| */ |
| #include <linux/init.h> |
| #include <linux/signal.h> |
| #include <linux/slab.h> |
| #include <linux/module.h> |
| #include <linux/netdevice.h> |
| #include <linux/usb.h> |
| |
| #include <linux/can.h> |
| #include <linux/can/dev.h> |
| #include <linux/can/error.h> |
| |
| #include "pcan_usb_core.h" |
| |
| MODULE_AUTHOR("Stephane Grosjean <s.grosjean@peak-system.com>"); |
| MODULE_DESCRIPTION("CAN driver for PEAK-System USB adapters"); |
| MODULE_LICENSE("GPL v2"); |
| |
| /* Table of devices that work with this driver */ |
| static struct usb_device_id peak_usb_table[] = { |
| {USB_DEVICE(PCAN_USB_VENDOR_ID, PCAN_USB_PRODUCT_ID)}, |
| {USB_DEVICE(PCAN_USB_VENDOR_ID, PCAN_USBPRO_PRODUCT_ID)}, |
| {} /* Terminating entry */ |
| }; |
| |
| MODULE_DEVICE_TABLE(usb, peak_usb_table); |
| |
| /* List of supported PCAN-USB adapters (NULL terminated list) */ |
| static struct peak_usb_adapter *peak_usb_adapters_list[] = { |
| &pcan_usb, |
| &pcan_usb_pro, |
| NULL, |
| }; |
| |
| /* |
| * dump memory |
| */ |
| #define DUMP_WIDTH 16 |
| void dump_mem(char *prompt, void *p, int l) |
| { |
| pr_info("%s dumping %s (%d bytes):\n", |
| PCAN_USB_DRIVER_NAME, prompt ? prompt : "memory", l); |
| print_hex_dump(KERN_INFO, PCAN_USB_DRIVER_NAME " ", DUMP_PREFIX_NONE, |
| DUMP_WIDTH, 1, p, l, false); |
| } |
| |
| /* |
| * initialize a time_ref object with usb adapter own settings |
| */ |
| void peak_usb_init_time_ref(struct peak_time_ref *time_ref, |
| struct peak_usb_adapter *adapter) |
| { |
| if (time_ref) { |
| memset(time_ref, 0, sizeof(struct peak_time_ref)); |
| time_ref->adapter = adapter; |
| } |
| } |
| |
| static void peak_usb_add_us(struct timeval *tv, u32 delta_us) |
| { |
| /* number of s. to add to final time */ |
| u32 delta_s = delta_us / 1000000; |
| |
| delta_us -= delta_s * 1000000; |
| |
| tv->tv_usec += delta_us; |
| if (tv->tv_usec >= 1000000) { |
| tv->tv_usec -= 1000000; |
| delta_s++; |
| } |
| tv->tv_sec += delta_s; |
| } |
| |
| /* |
| * sometimes, another now may be more recent than current one... |
| */ |
| void peak_usb_update_ts_now(struct peak_time_ref *time_ref, u32 ts_now) |
| { |
| time_ref->ts_dev_2 = ts_now; |
| |
| /* should wait at least two passes before computing */ |
| if (time_ref->tv_host.tv_sec > 0) { |
| u32 delta_ts = time_ref->ts_dev_2 - time_ref->ts_dev_1; |
| |
| if (time_ref->ts_dev_2 < time_ref->ts_dev_1) |
| delta_ts &= (1 << time_ref->adapter->ts_used_bits) - 1; |
| |
| time_ref->ts_total += delta_ts; |
| } |
| } |
| |
| /* |
| * register device timestamp as now |
| */ |
| void peak_usb_set_ts_now(struct peak_time_ref *time_ref, u32 ts_now) |
| { |
| if (time_ref->tv_host_0.tv_sec == 0) { |
| /* use monotonic clock to correctly compute further deltas */ |
| time_ref->tv_host_0 = ktime_to_timeval(ktime_get()); |
| time_ref->tv_host.tv_sec = 0; |
| } else { |
| /* |
| * delta_us should not be >= 2^32 => delta_s should be < 4294 |
| * handle 32-bits wrapping here: if count of s. reaches 4200, |
| * reset counters and change time base |
| */ |
| if (time_ref->tv_host.tv_sec != 0) { |
| u32 delta_s = time_ref->tv_host.tv_sec |
| - time_ref->tv_host_0.tv_sec; |
| if (delta_s > 4200) { |
| time_ref->tv_host_0 = time_ref->tv_host; |
| time_ref->ts_total = 0; |
| } |
| } |
| |
| time_ref->tv_host = ktime_to_timeval(ktime_get()); |
| time_ref->tick_count++; |
| } |
| |
| time_ref->ts_dev_1 = time_ref->ts_dev_2; |
| peak_usb_update_ts_now(time_ref, ts_now); |
| } |
| |
| /* |
| * compute timeval according to current ts and time_ref data |
| */ |
| void peak_usb_get_ts_tv(struct peak_time_ref *time_ref, u32 ts, |
| struct timeval *tv) |
| { |
| /* protect from getting timeval before setting now */ |
| if (time_ref->tv_host.tv_sec > 0) { |
| u64 delta_us; |
| |
| delta_us = ts - time_ref->ts_dev_2; |
| if (ts < time_ref->ts_dev_2) |
| delta_us &= (1 << time_ref->adapter->ts_used_bits) - 1; |
| |
| delta_us += time_ref->ts_total; |
| |
| delta_us *= time_ref->adapter->us_per_ts_scale; |
| delta_us >>= time_ref->adapter->us_per_ts_shift; |
| |
| *tv = time_ref->tv_host_0; |
| peak_usb_add_us(tv, (u32)delta_us); |
| } else { |
| *tv = ktime_to_timeval(ktime_get()); |
| } |
| } |
| |
| /* |
| * callback for bulk Rx urb |
| */ |
| static void peak_usb_read_bulk_callback(struct urb *urb) |
| { |
| struct peak_usb_device *dev = urb->context; |
| struct net_device *netdev; |
| int err; |
| |
| netdev = dev->netdev; |
| |
| if (!netif_device_present(netdev)) |
| return; |
| |
| /* check reception status */ |
| switch (urb->status) { |
| case 0: |
| /* success */ |
| break; |
| |
| case -EILSEQ: |
| case -ENOENT: |
| case -ECONNRESET: |
| case -ESHUTDOWN: |
| return; |
| |
| default: |
| if (net_ratelimit()) |
| netdev_err(netdev, |
| "Rx urb aborted (%d)\n", urb->status); |
| goto resubmit_urb; |
| } |
| |
| /* protect from any incoming empty msgs */ |
| if ((urb->actual_length > 0) && (dev->adapter->dev_decode_buf)) { |
| /* handle these kinds of msgs only if _start callback called */ |
| if (dev->state & PCAN_USB_STATE_STARTED) { |
| err = dev->adapter->dev_decode_buf(dev, urb); |
| if (err) |
| dump_mem("received usb message", |
| urb->transfer_buffer, |
| urb->transfer_buffer_length); |
| } |
| } |
| |
| resubmit_urb: |
| usb_fill_bulk_urb(urb, dev->udev, |
| usb_rcvbulkpipe(dev->udev, dev->ep_msg_in), |
| urb->transfer_buffer, dev->adapter->rx_buffer_size, |
| peak_usb_read_bulk_callback, dev); |
| |
| usb_anchor_urb(urb, &dev->rx_submitted); |
| err = usb_submit_urb(urb, GFP_ATOMIC); |
| if (!err) |
| return; |
| |
| usb_unanchor_urb(urb); |
| |
| if (err == -ENODEV) |
| netif_device_detach(netdev); |
| else |
| netdev_err(netdev, "failed resubmitting read bulk urb: %d\n", |
| err); |
| } |
| |
| /* |
| * callback for bulk Tx urb |
| */ |
| static void peak_usb_write_bulk_callback(struct urb *urb) |
| { |
| struct peak_tx_urb_context *context = urb->context; |
| struct peak_usb_device *dev; |
| struct net_device *netdev; |
| |
| BUG_ON(!context); |
| |
| dev = context->dev; |
| netdev = dev->netdev; |
| |
| atomic_dec(&dev->active_tx_urbs); |
| |
| if (!netif_device_present(netdev)) |
| return; |
| |
| /* check tx status */ |
| switch (urb->status) { |
| case 0: |
| /* transmission complete */ |
| netdev->stats.tx_packets++; |
| netdev->stats.tx_bytes += context->dlc; |
| |
| /* prevent tx timeout */ |
| netdev->trans_start = jiffies; |
| break; |
| |
| default: |
| if (net_ratelimit()) |
| netdev_err(netdev, "Tx urb aborted (%d)\n", |
| urb->status); |
| case -EPROTO: |
| case -ENOENT: |
| case -ECONNRESET: |
| case -ESHUTDOWN: |
| |
| break; |
| } |
| |
| /* should always release echo skb and corresponding context */ |
| can_get_echo_skb(netdev, context->echo_index); |
| context->echo_index = PCAN_USB_MAX_TX_URBS; |
| |
| /* do wakeup tx queue in case of success only */ |
| if (!urb->status) |
| netif_wake_queue(netdev); |
| } |
| |
| /* |
| * called by netdev to send one skb on the CAN interface. |
| */ |
| static netdev_tx_t peak_usb_ndo_start_xmit(struct sk_buff *skb, |
| struct net_device *netdev) |
| { |
| struct peak_usb_device *dev = netdev_priv(netdev); |
| struct peak_tx_urb_context *context = NULL; |
| struct net_device_stats *stats = &netdev->stats; |
| struct can_frame *cf = (struct can_frame *)skb->data; |
| struct urb *urb; |
| u8 *obuf; |
| int i, err; |
| size_t size = dev->adapter->tx_buffer_size; |
| |
| if (can_dropped_invalid_skb(netdev, skb)) |
| return NETDEV_TX_OK; |
| |
| for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) |
| if (dev->tx_contexts[i].echo_index == PCAN_USB_MAX_TX_URBS) { |
| context = dev->tx_contexts + i; |
| break; |
| } |
| |
| if (!context) { |
| /* should not occur except during restart */ |
| return NETDEV_TX_BUSY; |
| } |
| |
| urb = context->urb; |
| obuf = urb->transfer_buffer; |
| |
| err = dev->adapter->dev_encode_msg(dev, skb, obuf, &size); |
| if (err) { |
| if (net_ratelimit()) |
| netdev_err(netdev, "packet dropped\n"); |
| dev_kfree_skb(skb); |
| stats->tx_dropped++; |
| return NETDEV_TX_OK; |
| } |
| |
| context->echo_index = i; |
| context->dlc = cf->can_dlc; |
| |
| usb_anchor_urb(urb, &dev->tx_submitted); |
| |
| can_put_echo_skb(skb, netdev, context->echo_index); |
| |
| atomic_inc(&dev->active_tx_urbs); |
| |
| err = usb_submit_urb(urb, GFP_ATOMIC); |
| if (err) { |
| can_free_echo_skb(netdev, context->echo_index); |
| |
| usb_unanchor_urb(urb); |
| |
| /* this context is not used in fact */ |
| context->echo_index = PCAN_USB_MAX_TX_URBS; |
| |
| atomic_dec(&dev->active_tx_urbs); |
| |
| switch (err) { |
| case -ENODEV: |
| netif_device_detach(netdev); |
| break; |
| default: |
| netdev_warn(netdev, "tx urb submitting failed err=%d\n", |
| err); |
| case -ENOENT: |
| /* cable unplugged */ |
| stats->tx_dropped++; |
| } |
| } else { |
| netdev->trans_start = jiffies; |
| |
| /* slow down tx path */ |
| if (atomic_read(&dev->active_tx_urbs) >= PCAN_USB_MAX_TX_URBS) |
| netif_stop_queue(netdev); |
| } |
| |
| return NETDEV_TX_OK; |
| } |
| |
| /* |
| * start the CAN interface. |
| * Rx and Tx urbs are allocated here. Rx urbs are submitted here. |
| */ |
| static int peak_usb_start(struct peak_usb_device *dev) |
| { |
| struct net_device *netdev = dev->netdev; |
| int err, i; |
| |
| for (i = 0; i < PCAN_USB_MAX_RX_URBS; i++) { |
| struct urb *urb; |
| u8 *buf; |
| |
| /* create a URB, and a buffer for it, to receive usb messages */ |
| urb = usb_alloc_urb(0, GFP_KERNEL); |
| if (!urb) { |
| netdev_err(netdev, "No memory left for URBs\n"); |
| err = -ENOMEM; |
| break; |
| } |
| |
| buf = kmalloc(dev->adapter->rx_buffer_size, GFP_KERNEL); |
| if (!buf) { |
| netdev_err(netdev, "No memory left for USB buffer\n"); |
| usb_free_urb(urb); |
| err = -ENOMEM; |
| break; |
| } |
| |
| usb_fill_bulk_urb(urb, dev->udev, |
| usb_rcvbulkpipe(dev->udev, dev->ep_msg_in), |
| buf, dev->adapter->rx_buffer_size, |
| peak_usb_read_bulk_callback, dev); |
| |
| /* ask last usb_free_urb() to also kfree() transfer_buffer */ |
| urb->transfer_flags |= URB_FREE_BUFFER; |
| usb_anchor_urb(urb, &dev->rx_submitted); |
| |
| err = usb_submit_urb(urb, GFP_KERNEL); |
| if (err) { |
| if (err == -ENODEV) |
| netif_device_detach(dev->netdev); |
| |
| usb_unanchor_urb(urb); |
| kfree(buf); |
| usb_free_urb(urb); |
| break; |
| } |
| |
| /* drop reference, USB core will take care of freeing it */ |
| usb_free_urb(urb); |
| } |
| |
| /* did we submit any URBs? Warn if we was not able to submit all urbs */ |
| if (i < PCAN_USB_MAX_RX_URBS) { |
| if (i == 0) { |
| netdev_err(netdev, "couldn't setup any rx URB\n"); |
| return err; |
| } |
| |
| netdev_warn(netdev, "rx performance may be slow\n"); |
| } |
| |
| /* pre-alloc tx buffers and corresponding urbs */ |
| for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) { |
| struct peak_tx_urb_context *context; |
| struct urb *urb; |
| u8 *buf; |
| |
| /* create a URB and a buffer for it, to transmit usb messages */ |
| urb = usb_alloc_urb(0, GFP_KERNEL); |
| if (!urb) { |
| netdev_err(netdev, "No memory left for URBs\n"); |
| err = -ENOMEM; |
| break; |
| } |
| |
| buf = kmalloc(dev->adapter->tx_buffer_size, GFP_KERNEL); |
| if (!buf) { |
| netdev_err(netdev, "No memory left for USB buffer\n"); |
| usb_free_urb(urb); |
| err = -ENOMEM; |
| break; |
| } |
| |
| context = dev->tx_contexts + i; |
| context->dev = dev; |
| context->urb = urb; |
| |
| usb_fill_bulk_urb(urb, dev->udev, |
| usb_sndbulkpipe(dev->udev, dev->ep_msg_out), |
| buf, dev->adapter->tx_buffer_size, |
| peak_usb_write_bulk_callback, context); |
| |
| /* ask last usb_free_urb() to also kfree() transfer_buffer */ |
| urb->transfer_flags |= URB_FREE_BUFFER; |
| } |
| |
| /* warn if we were not able to allocate enough tx contexts */ |
| if (i < PCAN_USB_MAX_TX_URBS) { |
| if (i == 0) { |
| netdev_err(netdev, "couldn't setup any tx URB\n"); |
| return err; |
| } |
| |
| netdev_warn(netdev, "tx performance may be slow\n"); |
| } |
| |
| if (dev->adapter->dev_start) { |
| err = dev->adapter->dev_start(dev); |
| if (err) |
| goto failed; |
| } |
| |
| dev->state |= PCAN_USB_STATE_STARTED; |
| |
| /* can set bus on now */ |
| if (dev->adapter->dev_set_bus) { |
| err = dev->adapter->dev_set_bus(dev, 1); |
| if (err) |
| goto failed; |
| } |
| |
| dev->can.state = CAN_STATE_ERROR_ACTIVE; |
| |
| return 0; |
| |
| failed: |
| if (err == -ENODEV) |
| netif_device_detach(dev->netdev); |
| |
| netdev_warn(netdev, "couldn't submit control: %d\n", err); |
| |
| return err; |
| } |
| |
| /* |
| * called by netdev to open the corresponding CAN interface. |
| */ |
| static int peak_usb_ndo_open(struct net_device *netdev) |
| { |
| struct peak_usb_device *dev = netdev_priv(netdev); |
| int err; |
| |
| /* common open */ |
| err = open_candev(netdev); |
| if (err) |
| return err; |
| |
| /* finally start device */ |
| err = peak_usb_start(dev); |
| if (err) { |
| netdev_err(netdev, "couldn't start device: %d\n", err); |
| close_candev(netdev); |
| return err; |
| } |
| |
| dev->open_time = jiffies; |
| netif_start_queue(netdev); |
| |
| return 0; |
| } |
| |
| /* |
| * unlink in-flight Rx and Tx urbs and free their memory. |
| */ |
| static void peak_usb_unlink_all_urbs(struct peak_usb_device *dev) |
| { |
| int i; |
| |
| /* free all Rx (submitted) urbs */ |
| usb_kill_anchored_urbs(&dev->rx_submitted); |
| |
| /* free unsubmitted Tx urbs first */ |
| for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) { |
| struct urb *urb = dev->tx_contexts[i].urb; |
| |
| if (!urb || |
| dev->tx_contexts[i].echo_index != PCAN_USB_MAX_TX_URBS) { |
| /* |
| * this urb is already released or always submitted, |
| * let usb core free by itself |
| */ |
| continue; |
| } |
| |
| usb_free_urb(urb); |
| dev->tx_contexts[i].urb = NULL; |
| } |
| |
| /* then free all submitted Tx urbs */ |
| usb_kill_anchored_urbs(&dev->tx_submitted); |
| atomic_set(&dev->active_tx_urbs, 0); |
| } |
| |
| /* |
| * called by netdev to close the corresponding CAN interface. |
| */ |
| static int peak_usb_ndo_stop(struct net_device *netdev) |
| { |
| struct peak_usb_device *dev = netdev_priv(netdev); |
| |
| dev->state &= ~PCAN_USB_STATE_STARTED; |
| netif_stop_queue(netdev); |
| |
| /* unlink all pending urbs and free used memory */ |
| peak_usb_unlink_all_urbs(dev); |
| |
| if (dev->adapter->dev_stop) |
| dev->adapter->dev_stop(dev); |
| |
| close_candev(netdev); |
| |
| dev->open_time = 0; |
| dev->can.state = CAN_STATE_STOPPED; |
| |
| /* can set bus off now */ |
| if (dev->adapter->dev_set_bus) { |
| int err = dev->adapter->dev_set_bus(dev, 0); |
| if (err) |
| return err; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * handle end of waiting for the device to reset |
| */ |
| void peak_usb_restart_complete(struct peak_usb_device *dev) |
| { |
| /* finally MUST update can state */ |
| dev->can.state = CAN_STATE_ERROR_ACTIVE; |
| |
| /* netdev queue can be awaken now */ |
| netif_wake_queue(dev->netdev); |
| } |
| |
| void peak_usb_async_complete(struct urb *urb) |
| { |
| kfree(urb->transfer_buffer); |
| usb_free_urb(urb); |
| } |
| |
| /* |
| * device (auto-)restart mechanism runs in a timer context => |
| * MUST handle restart with asynchronous usb transfers |
| */ |
| static int peak_usb_restart(struct peak_usb_device *dev) |
| { |
| struct urb *urb; |
| int err; |
| u8 *buf; |
| |
| /* |
| * if device doesn't define any asynchronous restart handler, simply |
| * wake the netdev queue up |
| */ |
| if (!dev->adapter->dev_restart_async) { |
| peak_usb_restart_complete(dev); |
| return 0; |
| } |
| |
| /* first allocate a urb to handle the asynchronous steps */ |
| urb = usb_alloc_urb(0, GFP_ATOMIC); |
| if (!urb) { |
| netdev_err(dev->netdev, "no memory left for urb\n"); |
| return -ENOMEM; |
| } |
| |
| /* also allocate enough space for the commands to send */ |
| buf = kmalloc(PCAN_USB_MAX_CMD_LEN, GFP_ATOMIC); |
| if (!buf) { |
| netdev_err(dev->netdev, "no memory left for async cmd\n"); |
| usb_free_urb(urb); |
| return -ENOMEM; |
| } |
| |
| /* call the device specific handler for the restart */ |
| err = dev->adapter->dev_restart_async(dev, urb, buf); |
| if (!err) |
| return 0; |
| |
| kfree(buf); |
| usb_free_urb(urb); |
| |
| return err; |
| } |
| |
| /* |
| * candev callback used to change CAN mode. |
| * Warning: this is called from a timer context! |
| */ |
| static int peak_usb_set_mode(struct net_device *netdev, enum can_mode mode) |
| { |
| struct peak_usb_device *dev = netdev_priv(netdev); |
| int err = 0; |
| |
| if (!dev->open_time) |
| return -EINVAL; |
| |
| switch (mode) { |
| case CAN_MODE_START: |
| err = peak_usb_restart(dev); |
| if (err) |
| netdev_err(netdev, "couldn't start device (err %d)\n", |
| err); |
| break; |
| |
| default: |
| return -EOPNOTSUPP; |
| } |
| |
| return err; |
| } |
| |
| /* |
| * candev callback used to set device bitrate. |
| */ |
| static int peak_usb_set_bittiming(struct net_device *netdev) |
| { |
| struct peak_usb_device *dev = netdev_priv(netdev); |
| struct can_bittiming *bt = &dev->can.bittiming; |
| |
| if (dev->adapter->dev_set_bittiming) { |
| int err = dev->adapter->dev_set_bittiming(dev, bt); |
| |
| if (err) |
| netdev_info(netdev, "couldn't set bitrate (err %d)\n", |
| err); |
| return err; |
| } |
| |
| return 0; |
| } |
| |
| static const struct net_device_ops peak_usb_netdev_ops = { |
| .ndo_open = peak_usb_ndo_open, |
| .ndo_stop = peak_usb_ndo_stop, |
| .ndo_start_xmit = peak_usb_ndo_start_xmit, |
| }; |
| |
| /* |
| * create one device which is attached to CAN controller #ctrl_idx of the |
| * usb adapter. |
| */ |
| static int peak_usb_create_dev(struct peak_usb_adapter *peak_usb_adapter, |
| struct usb_interface *intf, int ctrl_idx) |
| { |
| struct usb_device *usb_dev = interface_to_usbdev(intf); |
| int sizeof_candev = peak_usb_adapter->sizeof_dev_private; |
| struct peak_usb_device *dev; |
| struct net_device *netdev; |
| int i, err; |
| u16 tmp16; |
| |
| if (sizeof_candev < sizeof(struct peak_usb_device)) |
| sizeof_candev = sizeof(struct peak_usb_device); |
| |
| netdev = alloc_candev(sizeof_candev, PCAN_USB_MAX_TX_URBS); |
| if (!netdev) { |
| dev_err(&intf->dev, "%s: couldn't alloc candev\n", |
| PCAN_USB_DRIVER_NAME); |
| return -ENOMEM; |
| } |
| |
| dev = netdev_priv(netdev); |
| |
| /* allocate a buffer large enough to send commands */ |
| dev->cmd_buf = kmalloc(PCAN_USB_MAX_CMD_LEN, GFP_KERNEL); |
| if (!dev->cmd_buf) { |
| dev_err(&intf->dev, "%s: couldn't alloc cmd buffer\n", |
| PCAN_USB_DRIVER_NAME); |
| err = -ENOMEM; |
| goto lbl_set_intf_data; |
| } |
| |
| dev->udev = usb_dev; |
| dev->netdev = netdev; |
| dev->adapter = peak_usb_adapter; |
| dev->ctrl_idx = ctrl_idx; |
| dev->state = PCAN_USB_STATE_CONNECTED; |
| |
| dev->ep_msg_in = peak_usb_adapter->ep_msg_in; |
| dev->ep_msg_out = peak_usb_adapter->ep_msg_out[ctrl_idx]; |
| |
| dev->can.clock = peak_usb_adapter->clock; |
| dev->can.bittiming_const = &peak_usb_adapter->bittiming_const; |
| dev->can.do_set_bittiming = peak_usb_set_bittiming; |
| dev->can.do_set_mode = peak_usb_set_mode; |
| dev->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES | |
| CAN_CTRLMODE_LISTENONLY; |
| |
| netdev->netdev_ops = &peak_usb_netdev_ops; |
| |
| netdev->flags |= IFF_ECHO; /* we support local echo */ |
| |
| init_usb_anchor(&dev->rx_submitted); |
| |
| init_usb_anchor(&dev->tx_submitted); |
| atomic_set(&dev->active_tx_urbs, 0); |
| |
| for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) |
| dev->tx_contexts[i].echo_index = PCAN_USB_MAX_TX_URBS; |
| |
| dev->prev_siblings = usb_get_intfdata(intf); |
| usb_set_intfdata(intf, dev); |
| |
| SET_NETDEV_DEV(netdev, &intf->dev); |
| |
| err = register_candev(netdev); |
| if (err) { |
| dev_err(&intf->dev, "couldn't register CAN device: %d\n", err); |
| goto lbl_free_cmd_buf; |
| } |
| |
| if (dev->prev_siblings) |
| (dev->prev_siblings)->next_siblings = dev; |
| |
| /* keep hw revision into the netdevice */ |
| tmp16 = le16_to_cpu(usb_dev->descriptor.bcdDevice); |
| dev->device_rev = tmp16 >> 8; |
| |
| if (dev->adapter->dev_init) { |
| err = dev->adapter->dev_init(dev); |
| if (err) |
| goto lbl_free_cmd_buf; |
| } |
| |
| /* set bus off */ |
| if (dev->adapter->dev_set_bus) { |
| err = dev->adapter->dev_set_bus(dev, 0); |
| if (err) |
| goto lbl_free_cmd_buf; |
| } |
| |
| /* get device number early */ |
| if (dev->adapter->dev_get_device_id) |
| dev->adapter->dev_get_device_id(dev, &dev->device_number); |
| |
| netdev_info(netdev, "attached to %s channel %u (device %u)\n", |
| peak_usb_adapter->name, ctrl_idx, dev->device_number); |
| |
| return 0; |
| |
| lbl_free_cmd_buf: |
| kfree(dev->cmd_buf); |
| |
| lbl_set_intf_data: |
| usb_set_intfdata(intf, dev->prev_siblings); |
| free_candev(netdev); |
| |
| return err; |
| } |
| |
| /* |
| * called by the usb core when the device is unplugged from the system |
| */ |
| static void peak_usb_disconnect(struct usb_interface *intf) |
| { |
| struct peak_usb_device *dev; |
| |
| /* unregister as many netdev devices as siblings */ |
| for (dev = usb_get_intfdata(intf); dev; dev = dev->prev_siblings) { |
| struct net_device *netdev = dev->netdev; |
| char name[IFNAMSIZ]; |
| |
| dev->state &= ~PCAN_USB_STATE_CONNECTED; |
| strncpy(name, netdev->name, IFNAMSIZ); |
| |
| unregister_netdev(netdev); |
| free_candev(netdev); |
| |
| kfree(dev->cmd_buf); |
| dev->next_siblings = NULL; |
| if (dev->adapter->dev_free) |
| dev->adapter->dev_free(dev); |
| |
| dev_info(&intf->dev, "%s removed\n", name); |
| } |
| |
| usb_set_intfdata(intf, NULL); |
| } |
| |
| /* |
| * probe function for new PEAK-System devices |
| */ |
| static int peak_usb_probe(struct usb_interface *intf, |
| const struct usb_device_id *id) |
| { |
| struct usb_device *usb_dev = interface_to_usbdev(intf); |
| struct peak_usb_adapter *peak_usb_adapter, **pp; |
| int i, err = -ENOMEM; |
| |
| usb_dev = interface_to_usbdev(intf); |
| |
| /* get corresponding PCAN-USB adapter */ |
| for (pp = peak_usb_adapters_list; *pp; pp++) |
| if ((*pp)->device_id == usb_dev->descriptor.idProduct) |
| break; |
| |
| peak_usb_adapter = *pp; |
| if (!peak_usb_adapter) { |
| /* should never come except device_id bad usage in this file */ |
| pr_err("%s: didn't find device id. 0x%x in devices list\n", |
| PCAN_USB_DRIVER_NAME, usb_dev->descriptor.idProduct); |
| return -ENODEV; |
| } |
| |
| /* got corresponding adapter: check if it handles current interface */ |
| if (peak_usb_adapter->intf_probe) { |
| err = peak_usb_adapter->intf_probe(intf); |
| if (err) |
| return err; |
| } |
| |
| for (i = 0; i < peak_usb_adapter->ctrl_count; i++) { |
| err = peak_usb_create_dev(peak_usb_adapter, intf, i); |
| if (err) { |
| /* deregister already created devices */ |
| peak_usb_disconnect(intf); |
| break; |
| } |
| } |
| |
| return err; |
| } |
| |
| /* usb specific object needed to register this driver with the usb subsystem */ |
| static struct usb_driver peak_usb_driver = { |
| .name = PCAN_USB_DRIVER_NAME, |
| .disconnect = peak_usb_disconnect, |
| .probe = peak_usb_probe, |
| .id_table = peak_usb_table, |
| }; |
| |
| static int __init peak_usb_init(void) |
| { |
| int err; |
| |
| /* register this driver with the USB subsystem */ |
| err = usb_register(&peak_usb_driver); |
| if (err) |
| pr_err("%s: usb_register failed (err %d)\n", |
| PCAN_USB_DRIVER_NAME, err); |
| |
| return err; |
| } |
| |
| static int peak_usb_do_device_exit(struct device *d, void *arg) |
| { |
| struct usb_interface *intf = to_usb_interface(d); |
| struct peak_usb_device *dev; |
| |
| /* stop as many netdev devices as siblings */ |
| for (dev = usb_get_intfdata(intf); dev; dev = dev->prev_siblings) { |
| struct net_device *netdev = dev->netdev; |
| |
| if (netif_device_present(netdev)) |
| if (dev->adapter->dev_exit) |
| dev->adapter->dev_exit(dev); |
| } |
| |
| return 0; |
| } |
| |
| static void __exit peak_usb_exit(void) |
| { |
| int err; |
| |
| /* last chance do send any synchronous commands here */ |
| err = driver_for_each_device(&peak_usb_driver.drvwrap.driver, NULL, |
| NULL, peak_usb_do_device_exit); |
| if (err) |
| pr_err("%s: failed to stop all can devices (err %d)\n", |
| PCAN_USB_DRIVER_NAME, err); |
| |
| /* deregister this driver with the USB subsystem */ |
| usb_deregister(&peak_usb_driver); |
| |
| pr_info("%s: PCAN-USB interfaces driver unloaded\n", |
| PCAN_USB_DRIVER_NAME); |
| } |
| |
| module_init(peak_usb_init); |
| module_exit(peak_usb_exit); |