| /* |
| * CAN driver for esd CAN-USB/2 and CAN-USB/Micro |
| * |
| * Copyright (C) 2010-2012 Matthias Fuchs <matthias.fuchs@esd.eu>, esd gmbh |
| * |
| * 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/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> |
| |
| MODULE_AUTHOR("Matthias Fuchs <matthias.fuchs@esd.eu>"); |
| MODULE_DESCRIPTION("CAN driver for esd CAN-USB/2 and CAN-USB/Micro interfaces"); |
| MODULE_LICENSE("GPL v2"); |
| |
| /* Define these values to match your devices */ |
| #define USB_ESDGMBH_VENDOR_ID 0x0ab4 |
| #define USB_CANUSB2_PRODUCT_ID 0x0010 |
| #define USB_CANUSBM_PRODUCT_ID 0x0011 |
| |
| #define ESD_USB2_CAN_CLOCK 60000000 |
| #define ESD_USBM_CAN_CLOCK 36000000 |
| #define ESD_USB2_MAX_NETS 2 |
| |
| /* USB2 commands */ |
| #define CMD_VERSION 1 /* also used for VERSION_REPLY */ |
| #define CMD_CAN_RX 2 /* device to host only */ |
| #define CMD_CAN_TX 3 /* also used for TX_DONE */ |
| #define CMD_SETBAUD 4 /* also used for SETBAUD_REPLY */ |
| #define CMD_TS 5 /* also used for TS_REPLY */ |
| #define CMD_IDADD 6 /* also used for IDADD_REPLY */ |
| |
| /* esd CAN message flags - dlc field */ |
| #define ESD_RTR 0x10 |
| |
| /* esd CAN message flags - id field */ |
| #define ESD_EXTID 0x20000000 |
| #define ESD_EVENT 0x40000000 |
| #define ESD_IDMASK 0x1fffffff |
| |
| /* esd CAN event ids used by this driver */ |
| #define ESD_EV_CAN_ERROR_EXT 2 |
| |
| /* baudrate message flags */ |
| #define ESD_USB2_UBR 0x80000000 |
| #define ESD_USB2_LOM 0x40000000 |
| #define ESD_USB2_NO_BAUDRATE 0x7fffffff |
| #define ESD_USB2_TSEG1_MIN 1 |
| #define ESD_USB2_TSEG1_MAX 16 |
| #define ESD_USB2_TSEG1_SHIFT 16 |
| #define ESD_USB2_TSEG2_MIN 1 |
| #define ESD_USB2_TSEG2_MAX 8 |
| #define ESD_USB2_TSEG2_SHIFT 20 |
| #define ESD_USB2_SJW_MAX 4 |
| #define ESD_USB2_SJW_SHIFT 14 |
| #define ESD_USBM_SJW_SHIFT 24 |
| #define ESD_USB2_BRP_MIN 1 |
| #define ESD_USB2_BRP_MAX 1024 |
| #define ESD_USB2_BRP_INC 1 |
| #define ESD_USB2_3_SAMPLES 0x00800000 |
| |
| /* esd IDADD message */ |
| #define ESD_ID_ENABLE 0x80 |
| #define ESD_MAX_ID_SEGMENT 64 |
| |
| /* SJA1000 ECC register (emulated by usb2 firmware) */ |
| #define SJA1000_ECC_SEG 0x1F |
| #define SJA1000_ECC_DIR 0x20 |
| #define SJA1000_ECC_ERR 0x06 |
| #define SJA1000_ECC_BIT 0x00 |
| #define SJA1000_ECC_FORM 0x40 |
| #define SJA1000_ECC_STUFF 0x80 |
| #define SJA1000_ECC_MASK 0xc0 |
| |
| /* esd bus state event codes */ |
| #define ESD_BUSSTATE_MASK 0xc0 |
| #define ESD_BUSSTATE_WARN 0x40 |
| #define ESD_BUSSTATE_ERRPASSIVE 0x80 |
| #define ESD_BUSSTATE_BUSOFF 0xc0 |
| |
| #define RX_BUFFER_SIZE 1024 |
| #define MAX_RX_URBS 4 |
| #define MAX_TX_URBS 16 /* must be power of 2 */ |
| |
| struct header_msg { |
| u8 len; /* len is always the total message length in 32bit words */ |
| u8 cmd; |
| u8 rsvd[2]; |
| }; |
| |
| struct version_msg { |
| u8 len; |
| u8 cmd; |
| u8 rsvd; |
| u8 flags; |
| __le32 drv_version; |
| }; |
| |
| struct version_reply_msg { |
| u8 len; |
| u8 cmd; |
| u8 nets; |
| u8 features; |
| __le32 version; |
| u8 name[16]; |
| __le32 rsvd; |
| __le32 ts; |
| }; |
| |
| struct rx_msg { |
| u8 len; |
| u8 cmd; |
| u8 net; |
| u8 dlc; |
| __le32 ts; |
| __le32 id; /* upper 3 bits contain flags */ |
| u8 data[8]; |
| }; |
| |
| struct tx_msg { |
| u8 len; |
| u8 cmd; |
| u8 net; |
| u8 dlc; |
| u32 hnd; /* opaque handle, not used by device */ |
| __le32 id; /* upper 3 bits contain flags */ |
| u8 data[8]; |
| }; |
| |
| struct tx_done_msg { |
| u8 len; |
| u8 cmd; |
| u8 net; |
| u8 status; |
| u32 hnd; /* opaque handle, not used by device */ |
| __le32 ts; |
| }; |
| |
| struct id_filter_msg { |
| u8 len; |
| u8 cmd; |
| u8 net; |
| u8 option; |
| __le32 mask[ESD_MAX_ID_SEGMENT + 1]; |
| }; |
| |
| struct set_baudrate_msg { |
| u8 len; |
| u8 cmd; |
| u8 net; |
| u8 rsvd; |
| __le32 baud; |
| }; |
| |
| /* Main message type used between library and application */ |
| struct __attribute__ ((packed)) esd_usb2_msg { |
| union { |
| struct header_msg hdr; |
| struct version_msg version; |
| struct version_reply_msg version_reply; |
| struct rx_msg rx; |
| struct tx_msg tx; |
| struct tx_done_msg txdone; |
| struct set_baudrate_msg setbaud; |
| struct id_filter_msg filter; |
| } msg; |
| }; |
| |
| static struct usb_device_id esd_usb2_table[] = { |
| {USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSB2_PRODUCT_ID)}, |
| {USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSBM_PRODUCT_ID)}, |
| {} |
| }; |
| MODULE_DEVICE_TABLE(usb, esd_usb2_table); |
| |
| struct esd_usb2_net_priv; |
| |
| struct esd_tx_urb_context { |
| struct esd_usb2_net_priv *priv; |
| u32 echo_index; |
| int dlc; |
| }; |
| |
| struct esd_usb2 { |
| struct usb_device *udev; |
| struct esd_usb2_net_priv *nets[ESD_USB2_MAX_NETS]; |
| |
| struct usb_anchor rx_submitted; |
| |
| int net_count; |
| u32 version; |
| int rxinitdone; |
| void *rxbuf[MAX_RX_URBS]; |
| dma_addr_t rxbuf_dma[MAX_RX_URBS]; |
| }; |
| |
| struct esd_usb2_net_priv { |
| struct can_priv can; /* must be the first member */ |
| |
| atomic_t active_tx_jobs; |
| struct usb_anchor tx_submitted; |
| struct esd_tx_urb_context tx_contexts[MAX_TX_URBS]; |
| |
| struct esd_usb2 *usb2; |
| struct net_device *netdev; |
| int index; |
| u8 old_state; |
| struct can_berr_counter bec; |
| }; |
| |
| static void esd_usb2_rx_event(struct esd_usb2_net_priv *priv, |
| struct esd_usb2_msg *msg) |
| { |
| struct net_device_stats *stats = &priv->netdev->stats; |
| struct can_frame *cf; |
| struct sk_buff *skb; |
| u32 id = le32_to_cpu(msg->msg.rx.id) & ESD_IDMASK; |
| |
| if (id == ESD_EV_CAN_ERROR_EXT) { |
| u8 state = msg->msg.rx.data[0]; |
| u8 ecc = msg->msg.rx.data[1]; |
| u8 rxerr = msg->msg.rx.data[2]; |
| u8 txerr = msg->msg.rx.data[3]; |
| |
| skb = alloc_can_err_skb(priv->netdev, &cf); |
| if (skb == NULL) { |
| stats->rx_dropped++; |
| return; |
| } |
| |
| if (state != priv->old_state) { |
| priv->old_state = state; |
| |
| switch (state & ESD_BUSSTATE_MASK) { |
| case ESD_BUSSTATE_BUSOFF: |
| priv->can.state = CAN_STATE_BUS_OFF; |
| cf->can_id |= CAN_ERR_BUSOFF; |
| priv->can.can_stats.bus_off++; |
| can_bus_off(priv->netdev); |
| break; |
| case ESD_BUSSTATE_WARN: |
| priv->can.state = CAN_STATE_ERROR_WARNING; |
| priv->can.can_stats.error_warning++; |
| break; |
| case ESD_BUSSTATE_ERRPASSIVE: |
| priv->can.state = CAN_STATE_ERROR_PASSIVE; |
| priv->can.can_stats.error_passive++; |
| break; |
| default: |
| priv->can.state = CAN_STATE_ERROR_ACTIVE; |
| break; |
| } |
| } else { |
| priv->can.can_stats.bus_error++; |
| stats->rx_errors++; |
| |
| cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; |
| |
| switch (ecc & SJA1000_ECC_MASK) { |
| case SJA1000_ECC_BIT: |
| cf->data[2] |= CAN_ERR_PROT_BIT; |
| break; |
| case SJA1000_ECC_FORM: |
| cf->data[2] |= CAN_ERR_PROT_FORM; |
| break; |
| case SJA1000_ECC_STUFF: |
| cf->data[2] |= CAN_ERR_PROT_STUFF; |
| break; |
| default: |
| cf->data[3] = ecc & SJA1000_ECC_SEG; |
| break; |
| } |
| |
| /* Error occurred during transmission? */ |
| if (!(ecc & SJA1000_ECC_DIR)) |
| cf->data[2] |= CAN_ERR_PROT_TX; |
| |
| if (priv->can.state == CAN_STATE_ERROR_WARNING || |
| priv->can.state == CAN_STATE_ERROR_PASSIVE) { |
| cf->data[1] = (txerr > rxerr) ? |
| CAN_ERR_CRTL_TX_PASSIVE : |
| CAN_ERR_CRTL_RX_PASSIVE; |
| } |
| cf->data[6] = txerr; |
| cf->data[7] = rxerr; |
| } |
| |
| priv->bec.txerr = txerr; |
| priv->bec.rxerr = rxerr; |
| |
| stats->rx_packets++; |
| stats->rx_bytes += cf->can_dlc; |
| netif_rx(skb); |
| } |
| } |
| |
| static void esd_usb2_rx_can_msg(struct esd_usb2_net_priv *priv, |
| struct esd_usb2_msg *msg) |
| { |
| struct net_device_stats *stats = &priv->netdev->stats; |
| struct can_frame *cf; |
| struct sk_buff *skb; |
| int i; |
| u32 id; |
| |
| if (!netif_device_present(priv->netdev)) |
| return; |
| |
| id = le32_to_cpu(msg->msg.rx.id); |
| |
| if (id & ESD_EVENT) { |
| esd_usb2_rx_event(priv, msg); |
| } else { |
| skb = alloc_can_skb(priv->netdev, &cf); |
| if (skb == NULL) { |
| stats->rx_dropped++; |
| return; |
| } |
| |
| cf->can_id = id & ESD_IDMASK; |
| cf->can_dlc = get_can_dlc(msg->msg.rx.dlc & ~ESD_RTR); |
| |
| if (id & ESD_EXTID) |
| cf->can_id |= CAN_EFF_FLAG; |
| |
| if (msg->msg.rx.dlc & ESD_RTR) { |
| cf->can_id |= CAN_RTR_FLAG; |
| } else { |
| for (i = 0; i < cf->can_dlc; i++) |
| cf->data[i] = msg->msg.rx.data[i]; |
| } |
| |
| stats->rx_packets++; |
| stats->rx_bytes += cf->can_dlc; |
| netif_rx(skb); |
| } |
| |
| return; |
| } |
| |
| static void esd_usb2_tx_done_msg(struct esd_usb2_net_priv *priv, |
| struct esd_usb2_msg *msg) |
| { |
| struct net_device_stats *stats = &priv->netdev->stats; |
| struct net_device *netdev = priv->netdev; |
| struct esd_tx_urb_context *context; |
| |
| if (!netif_device_present(netdev)) |
| return; |
| |
| context = &priv->tx_contexts[msg->msg.txdone.hnd & (MAX_TX_URBS - 1)]; |
| |
| if (!msg->msg.txdone.status) { |
| stats->tx_packets++; |
| stats->tx_bytes += context->dlc; |
| can_get_echo_skb(netdev, context->echo_index); |
| } else { |
| stats->tx_errors++; |
| can_free_echo_skb(netdev, context->echo_index); |
| } |
| |
| /* Release context */ |
| context->echo_index = MAX_TX_URBS; |
| atomic_dec(&priv->active_tx_jobs); |
| |
| netif_wake_queue(netdev); |
| } |
| |
| static void esd_usb2_read_bulk_callback(struct urb *urb) |
| { |
| struct esd_usb2 *dev = urb->context; |
| int retval; |
| int pos = 0; |
| int i; |
| |
| switch (urb->status) { |
| case 0: /* success */ |
| break; |
| |
| case -ENOENT: |
| case -EPIPE: |
| case -EPROTO: |
| case -ESHUTDOWN: |
| return; |
| |
| default: |
| dev_info(dev->udev->dev.parent, |
| "Rx URB aborted (%d)\n", urb->status); |
| goto resubmit_urb; |
| } |
| |
| while (pos < urb->actual_length) { |
| struct esd_usb2_msg *msg; |
| |
| msg = (struct esd_usb2_msg *)(urb->transfer_buffer + pos); |
| |
| switch (msg->msg.hdr.cmd) { |
| case CMD_CAN_RX: |
| if (msg->msg.rx.net >= dev->net_count) { |
| dev_err(dev->udev->dev.parent, "format error\n"); |
| break; |
| } |
| |
| esd_usb2_rx_can_msg(dev->nets[msg->msg.rx.net], msg); |
| break; |
| |
| case CMD_CAN_TX: |
| if (msg->msg.txdone.net >= dev->net_count) { |
| dev_err(dev->udev->dev.parent, "format error\n"); |
| break; |
| } |
| |
| esd_usb2_tx_done_msg(dev->nets[msg->msg.txdone.net], |
| msg); |
| break; |
| } |
| |
| pos += msg->msg.hdr.len << 2; |
| |
| if (pos > urb->actual_length) { |
| dev_err(dev->udev->dev.parent, "format error\n"); |
| break; |
| } |
| } |
| |
| resubmit_urb: |
| usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1), |
| urb->transfer_buffer, RX_BUFFER_SIZE, |
| esd_usb2_read_bulk_callback, dev); |
| |
| retval = usb_submit_urb(urb, GFP_ATOMIC); |
| if (retval == -ENODEV) { |
| for (i = 0; i < dev->net_count; i++) { |
| if (dev->nets[i]) |
| netif_device_detach(dev->nets[i]->netdev); |
| } |
| } else if (retval) { |
| dev_err(dev->udev->dev.parent, |
| "failed resubmitting read bulk urb: %d\n", retval); |
| } |
| |
| return; |
| } |
| |
| /* |
| * callback for bulk IN urb |
| */ |
| static void esd_usb2_write_bulk_callback(struct urb *urb) |
| { |
| struct esd_tx_urb_context *context = urb->context; |
| struct esd_usb2_net_priv *priv; |
| struct net_device *netdev; |
| size_t size = sizeof(struct esd_usb2_msg); |
| |
| WARN_ON(!context); |
| |
| priv = context->priv; |
| netdev = priv->netdev; |
| |
| /* free up our allocated buffer */ |
| usb_free_coherent(urb->dev, size, |
| urb->transfer_buffer, urb->transfer_dma); |
| |
| if (!netif_device_present(netdev)) |
| return; |
| |
| if (urb->status) |
| netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status); |
| |
| netif_trans_update(netdev); |
| } |
| |
| static ssize_t show_firmware(struct device *d, |
| struct device_attribute *attr, char *buf) |
| { |
| struct usb_interface *intf = to_usb_interface(d); |
| struct esd_usb2 *dev = usb_get_intfdata(intf); |
| |
| return sprintf(buf, "%d.%d.%d\n", |
| (dev->version >> 12) & 0xf, |
| (dev->version >> 8) & 0xf, |
| dev->version & 0xff); |
| } |
| static DEVICE_ATTR(firmware, 0444, show_firmware, NULL); |
| |
| static ssize_t show_hardware(struct device *d, |
| struct device_attribute *attr, char *buf) |
| { |
| struct usb_interface *intf = to_usb_interface(d); |
| struct esd_usb2 *dev = usb_get_intfdata(intf); |
| |
| return sprintf(buf, "%d.%d.%d\n", |
| (dev->version >> 28) & 0xf, |
| (dev->version >> 24) & 0xf, |
| (dev->version >> 16) & 0xff); |
| } |
| static DEVICE_ATTR(hardware, 0444, show_hardware, NULL); |
| |
| static ssize_t show_nets(struct device *d, |
| struct device_attribute *attr, char *buf) |
| { |
| struct usb_interface *intf = to_usb_interface(d); |
| struct esd_usb2 *dev = usb_get_intfdata(intf); |
| |
| return sprintf(buf, "%d", dev->net_count); |
| } |
| static DEVICE_ATTR(nets, 0444, show_nets, NULL); |
| |
| static int esd_usb2_send_msg(struct esd_usb2 *dev, struct esd_usb2_msg *msg) |
| { |
| int actual_length; |
| |
| return usb_bulk_msg(dev->udev, |
| usb_sndbulkpipe(dev->udev, 2), |
| msg, |
| msg->msg.hdr.len << 2, |
| &actual_length, |
| 1000); |
| } |
| |
| static int esd_usb2_wait_msg(struct esd_usb2 *dev, |
| struct esd_usb2_msg *msg) |
| { |
| int actual_length; |
| |
| return usb_bulk_msg(dev->udev, |
| usb_rcvbulkpipe(dev->udev, 1), |
| msg, |
| sizeof(*msg), |
| &actual_length, |
| 1000); |
| } |
| |
| static int esd_usb2_setup_rx_urbs(struct esd_usb2 *dev) |
| { |
| int i, err = 0; |
| |
| if (dev->rxinitdone) |
| return 0; |
| |
| for (i = 0; i < MAX_RX_URBS; i++) { |
| struct urb *urb = NULL; |
| u8 *buf = NULL; |
| dma_addr_t buf_dma; |
| |
| /* create a URB, and a buffer for it */ |
| urb = usb_alloc_urb(0, GFP_KERNEL); |
| if (!urb) { |
| err = -ENOMEM; |
| break; |
| } |
| |
| buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL, |
| &buf_dma); |
| if (!buf) { |
| dev_warn(dev->udev->dev.parent, |
| "No memory left for USB buffer\n"); |
| err = -ENOMEM; |
| goto freeurb; |
| } |
| |
| urb->transfer_dma = buf_dma; |
| |
| usb_fill_bulk_urb(urb, dev->udev, |
| usb_rcvbulkpipe(dev->udev, 1), |
| buf, RX_BUFFER_SIZE, |
| esd_usb2_read_bulk_callback, dev); |
| urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
| usb_anchor_urb(urb, &dev->rx_submitted); |
| |
| err = usb_submit_urb(urb, GFP_KERNEL); |
| if (err) { |
| usb_unanchor_urb(urb); |
| usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf, |
| urb->transfer_dma); |
| goto freeurb; |
| } |
| |
| dev->rxbuf[i] = buf; |
| dev->rxbuf_dma[i] = buf_dma; |
| |
| freeurb: |
| /* Drop reference, USB core will take care of freeing it */ |
| usb_free_urb(urb); |
| if (err) |
| break; |
| } |
| |
| /* Did we submit any URBs */ |
| if (i == 0) { |
| dev_err(dev->udev->dev.parent, "couldn't setup read URBs\n"); |
| return err; |
| } |
| |
| /* Warn if we've couldn't transmit all the URBs */ |
| if (i < MAX_RX_URBS) { |
| dev_warn(dev->udev->dev.parent, |
| "rx performance may be slow\n"); |
| } |
| |
| dev->rxinitdone = 1; |
| return 0; |
| } |
| |
| /* |
| * Start interface |
| */ |
| static int esd_usb2_start(struct esd_usb2_net_priv *priv) |
| { |
| struct esd_usb2 *dev = priv->usb2; |
| struct net_device *netdev = priv->netdev; |
| struct esd_usb2_msg *msg; |
| int err, i; |
| |
| msg = kmalloc(sizeof(*msg), GFP_KERNEL); |
| if (!msg) { |
| err = -ENOMEM; |
| goto out; |
| } |
| |
| /* |
| * Enable all IDs |
| * The IDADD message takes up to 64 32 bit bitmasks (2048 bits). |
| * Each bit represents one 11 bit CAN identifier. A set bit |
| * enables reception of the corresponding CAN identifier. A cleared |
| * bit disabled this identifier. An additional bitmask value |
| * following the CAN 2.0A bits is used to enable reception of |
| * extended CAN frames. Only the LSB of this final mask is checked |
| * for the complete 29 bit ID range. The IDADD message also allows |
| * filter configuration for an ID subset. In this case you can add |
| * the number of the starting bitmask (0..64) to the filter.option |
| * field followed by only some bitmasks. |
| */ |
| msg->msg.hdr.cmd = CMD_IDADD; |
| msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; |
| msg->msg.filter.net = priv->index; |
| msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ |
| for (i = 0; i < ESD_MAX_ID_SEGMENT; i++) |
| msg->msg.filter.mask[i] = cpu_to_le32(0xffffffff); |
| /* enable 29bit extended IDs */ |
| msg->msg.filter.mask[ESD_MAX_ID_SEGMENT] = cpu_to_le32(0x00000001); |
| |
| err = esd_usb2_send_msg(dev, msg); |
| if (err) |
| goto out; |
| |
| err = esd_usb2_setup_rx_urbs(dev); |
| if (err) |
| goto out; |
| |
| priv->can.state = CAN_STATE_ERROR_ACTIVE; |
| |
| out: |
| if (err == -ENODEV) |
| netif_device_detach(netdev); |
| if (err) |
| netdev_err(netdev, "couldn't start device: %d\n", err); |
| |
| kfree(msg); |
| return err; |
| } |
| |
| static void unlink_all_urbs(struct esd_usb2 *dev) |
| { |
| struct esd_usb2_net_priv *priv; |
| int i, j; |
| |
| usb_kill_anchored_urbs(&dev->rx_submitted); |
| |
| for (i = 0; i < MAX_RX_URBS; ++i) |
| usb_free_coherent(dev->udev, RX_BUFFER_SIZE, |
| dev->rxbuf[i], dev->rxbuf_dma[i]); |
| |
| for (i = 0; i < dev->net_count; i++) { |
| priv = dev->nets[i]; |
| if (priv) { |
| usb_kill_anchored_urbs(&priv->tx_submitted); |
| atomic_set(&priv->active_tx_jobs, 0); |
| |
| for (j = 0; j < MAX_TX_URBS; j++) |
| priv->tx_contexts[j].echo_index = MAX_TX_URBS; |
| } |
| } |
| } |
| |
| static int esd_usb2_open(struct net_device *netdev) |
| { |
| struct esd_usb2_net_priv *priv = netdev_priv(netdev); |
| int err; |
| |
| /* common open */ |
| err = open_candev(netdev); |
| if (err) |
| return err; |
| |
| /* finally start device */ |
| err = esd_usb2_start(priv); |
| if (err) { |
| netdev_warn(netdev, "couldn't start device: %d\n", err); |
| close_candev(netdev); |
| return err; |
| } |
| |
| netif_start_queue(netdev); |
| |
| return 0; |
| } |
| |
| static netdev_tx_t esd_usb2_start_xmit(struct sk_buff *skb, |
| struct net_device *netdev) |
| { |
| struct esd_usb2_net_priv *priv = netdev_priv(netdev); |
| struct esd_usb2 *dev = priv->usb2; |
| struct esd_tx_urb_context *context = NULL; |
| struct net_device_stats *stats = &netdev->stats; |
| struct can_frame *cf = (struct can_frame *)skb->data; |
| struct esd_usb2_msg *msg; |
| struct urb *urb; |
| u8 *buf; |
| int i, err; |
| int ret = NETDEV_TX_OK; |
| size_t size = sizeof(struct esd_usb2_msg); |
| |
| if (can_dropped_invalid_skb(netdev, skb)) |
| return NETDEV_TX_OK; |
| |
| /* create a URB, and a buffer for it, and copy the data to the URB */ |
| urb = usb_alloc_urb(0, GFP_ATOMIC); |
| if (!urb) { |
| stats->tx_dropped++; |
| dev_kfree_skb(skb); |
| goto nourbmem; |
| } |
| |
| buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC, |
| &urb->transfer_dma); |
| if (!buf) { |
| netdev_err(netdev, "No memory left for USB buffer\n"); |
| stats->tx_dropped++; |
| dev_kfree_skb(skb); |
| goto nobufmem; |
| } |
| |
| msg = (struct esd_usb2_msg *)buf; |
| |
| msg->msg.hdr.len = 3; /* minimal length */ |
| msg->msg.hdr.cmd = CMD_CAN_TX; |
| msg->msg.tx.net = priv->index; |
| msg->msg.tx.dlc = cf->can_dlc; |
| msg->msg.tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK); |
| |
| if (cf->can_id & CAN_RTR_FLAG) |
| msg->msg.tx.dlc |= ESD_RTR; |
| |
| if (cf->can_id & CAN_EFF_FLAG) |
| msg->msg.tx.id |= cpu_to_le32(ESD_EXTID); |
| |
| for (i = 0; i < cf->can_dlc; i++) |
| msg->msg.tx.data[i] = cf->data[i]; |
| |
| msg->msg.hdr.len += (cf->can_dlc + 3) >> 2; |
| |
| for (i = 0; i < MAX_TX_URBS; i++) { |
| if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) { |
| context = &priv->tx_contexts[i]; |
| break; |
| } |
| } |
| |
| /* |
| * This may never happen. |
| */ |
| if (!context) { |
| netdev_warn(netdev, "couldn't find free context\n"); |
| ret = NETDEV_TX_BUSY; |
| goto releasebuf; |
| } |
| |
| context->priv = priv; |
| context->echo_index = i; |
| context->dlc = cf->can_dlc; |
| |
| /* hnd must not be 0 - MSB is stripped in txdone handling */ |
| msg->msg.tx.hnd = 0x80000000 | i; /* returned in TX done message */ |
| |
| usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf, |
| msg->msg.hdr.len << 2, |
| esd_usb2_write_bulk_callback, context); |
| |
| urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
| |
| usb_anchor_urb(urb, &priv->tx_submitted); |
| |
| can_put_echo_skb(skb, netdev, context->echo_index); |
| |
| atomic_inc(&priv->active_tx_jobs); |
| |
| /* Slow down tx path */ |
| if (atomic_read(&priv->active_tx_jobs) >= MAX_TX_URBS) |
| netif_stop_queue(netdev); |
| |
| err = usb_submit_urb(urb, GFP_ATOMIC); |
| if (err) { |
| can_free_echo_skb(netdev, context->echo_index); |
| |
| atomic_dec(&priv->active_tx_jobs); |
| usb_unanchor_urb(urb); |
| |
| stats->tx_dropped++; |
| |
| if (err == -ENODEV) |
| netif_device_detach(netdev); |
| else |
| netdev_warn(netdev, "failed tx_urb %d\n", err); |
| |
| goto releasebuf; |
| } |
| |
| netif_trans_update(netdev); |
| |
| /* |
| * Release our reference to this URB, the USB core will eventually free |
| * it entirely. |
| */ |
| usb_free_urb(urb); |
| |
| return NETDEV_TX_OK; |
| |
| releasebuf: |
| usb_free_coherent(dev->udev, size, buf, urb->transfer_dma); |
| |
| nobufmem: |
| usb_free_urb(urb); |
| |
| nourbmem: |
| return ret; |
| } |
| |
| static int esd_usb2_close(struct net_device *netdev) |
| { |
| struct esd_usb2_net_priv *priv = netdev_priv(netdev); |
| struct esd_usb2_msg *msg; |
| int i; |
| |
| msg = kmalloc(sizeof(*msg), GFP_KERNEL); |
| if (!msg) |
| return -ENOMEM; |
| |
| /* Disable all IDs (see esd_usb2_start()) */ |
| msg->msg.hdr.cmd = CMD_IDADD; |
| msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; |
| msg->msg.filter.net = priv->index; |
| msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ |
| for (i = 0; i <= ESD_MAX_ID_SEGMENT; i++) |
| msg->msg.filter.mask[i] = 0; |
| if (esd_usb2_send_msg(priv->usb2, msg) < 0) |
| netdev_err(netdev, "sending idadd message failed\n"); |
| |
| /* set CAN controller to reset mode */ |
| msg->msg.hdr.len = 2; |
| msg->msg.hdr.cmd = CMD_SETBAUD; |
| msg->msg.setbaud.net = priv->index; |
| msg->msg.setbaud.rsvd = 0; |
| msg->msg.setbaud.baud = cpu_to_le32(ESD_USB2_NO_BAUDRATE); |
| if (esd_usb2_send_msg(priv->usb2, msg) < 0) |
| netdev_err(netdev, "sending setbaud message failed\n"); |
| |
| priv->can.state = CAN_STATE_STOPPED; |
| |
| netif_stop_queue(netdev); |
| |
| close_candev(netdev); |
| |
| kfree(msg); |
| |
| return 0; |
| } |
| |
| static const struct net_device_ops esd_usb2_netdev_ops = { |
| .ndo_open = esd_usb2_open, |
| .ndo_stop = esd_usb2_close, |
| .ndo_start_xmit = esd_usb2_start_xmit, |
| .ndo_change_mtu = can_change_mtu, |
| }; |
| |
| static const struct can_bittiming_const esd_usb2_bittiming_const = { |
| .name = "esd_usb2", |
| .tseg1_min = ESD_USB2_TSEG1_MIN, |
| .tseg1_max = ESD_USB2_TSEG1_MAX, |
| .tseg2_min = ESD_USB2_TSEG2_MIN, |
| .tseg2_max = ESD_USB2_TSEG2_MAX, |
| .sjw_max = ESD_USB2_SJW_MAX, |
| .brp_min = ESD_USB2_BRP_MIN, |
| .brp_max = ESD_USB2_BRP_MAX, |
| .brp_inc = ESD_USB2_BRP_INC, |
| }; |
| |
| static int esd_usb2_set_bittiming(struct net_device *netdev) |
| { |
| struct esd_usb2_net_priv *priv = netdev_priv(netdev); |
| struct can_bittiming *bt = &priv->can.bittiming; |
| struct esd_usb2_msg *msg; |
| int err; |
| u32 canbtr; |
| int sjw_shift; |
| |
| canbtr = ESD_USB2_UBR; |
| if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) |
| canbtr |= ESD_USB2_LOM; |
| |
| canbtr |= (bt->brp - 1) & (ESD_USB2_BRP_MAX - 1); |
| |
| if (le16_to_cpu(priv->usb2->udev->descriptor.idProduct) == |
| USB_CANUSBM_PRODUCT_ID) |
| sjw_shift = ESD_USBM_SJW_SHIFT; |
| else |
| sjw_shift = ESD_USB2_SJW_SHIFT; |
| |
| canbtr |= ((bt->sjw - 1) & (ESD_USB2_SJW_MAX - 1)) |
| << sjw_shift; |
| canbtr |= ((bt->prop_seg + bt->phase_seg1 - 1) |
| & (ESD_USB2_TSEG1_MAX - 1)) |
| << ESD_USB2_TSEG1_SHIFT; |
| canbtr |= ((bt->phase_seg2 - 1) & (ESD_USB2_TSEG2_MAX - 1)) |
| << ESD_USB2_TSEG2_SHIFT; |
| if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) |
| canbtr |= ESD_USB2_3_SAMPLES; |
| |
| msg = kmalloc(sizeof(*msg), GFP_KERNEL); |
| if (!msg) |
| return -ENOMEM; |
| |
| msg->msg.hdr.len = 2; |
| msg->msg.hdr.cmd = CMD_SETBAUD; |
| msg->msg.setbaud.net = priv->index; |
| msg->msg.setbaud.rsvd = 0; |
| msg->msg.setbaud.baud = cpu_to_le32(canbtr); |
| |
| netdev_info(netdev, "setting BTR=%#x\n", canbtr); |
| |
| err = esd_usb2_send_msg(priv->usb2, msg); |
| |
| kfree(msg); |
| return err; |
| } |
| |
| static int esd_usb2_get_berr_counter(const struct net_device *netdev, |
| struct can_berr_counter *bec) |
| { |
| struct esd_usb2_net_priv *priv = netdev_priv(netdev); |
| |
| bec->txerr = priv->bec.txerr; |
| bec->rxerr = priv->bec.rxerr; |
| |
| return 0; |
| } |
| |
| static int esd_usb2_set_mode(struct net_device *netdev, enum can_mode mode) |
| { |
| switch (mode) { |
| case CAN_MODE_START: |
| netif_wake_queue(netdev); |
| break; |
| |
| default: |
| return -EOPNOTSUPP; |
| } |
| |
| return 0; |
| } |
| |
| static int esd_usb2_probe_one_net(struct usb_interface *intf, int index) |
| { |
| struct esd_usb2 *dev = usb_get_intfdata(intf); |
| struct net_device *netdev; |
| struct esd_usb2_net_priv *priv; |
| int err = 0; |
| int i; |
| |
| netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS); |
| if (!netdev) { |
| dev_err(&intf->dev, "couldn't alloc candev\n"); |
| err = -ENOMEM; |
| goto done; |
| } |
| |
| priv = netdev_priv(netdev); |
| |
| init_usb_anchor(&priv->tx_submitted); |
| atomic_set(&priv->active_tx_jobs, 0); |
| |
| for (i = 0; i < MAX_TX_URBS; i++) |
| priv->tx_contexts[i].echo_index = MAX_TX_URBS; |
| |
| priv->usb2 = dev; |
| priv->netdev = netdev; |
| priv->index = index; |
| |
| priv->can.state = CAN_STATE_STOPPED; |
| priv->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY; |
| |
| if (le16_to_cpu(dev->udev->descriptor.idProduct) == |
| USB_CANUSBM_PRODUCT_ID) |
| priv->can.clock.freq = ESD_USBM_CAN_CLOCK; |
| else { |
| priv->can.clock.freq = ESD_USB2_CAN_CLOCK; |
| priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES; |
| } |
| |
| priv->can.bittiming_const = &esd_usb2_bittiming_const; |
| priv->can.do_set_bittiming = esd_usb2_set_bittiming; |
| priv->can.do_set_mode = esd_usb2_set_mode; |
| priv->can.do_get_berr_counter = esd_usb2_get_berr_counter; |
| |
| netdev->flags |= IFF_ECHO; /* we support local echo */ |
| |
| netdev->netdev_ops = &esd_usb2_netdev_ops; |
| |
| SET_NETDEV_DEV(netdev, &intf->dev); |
| netdev->dev_id = index; |
| |
| err = register_candev(netdev); |
| if (err) { |
| dev_err(&intf->dev, "couldn't register CAN device: %d\n", err); |
| free_candev(netdev); |
| err = -ENOMEM; |
| goto done; |
| } |
| |
| dev->nets[index] = priv; |
| netdev_info(netdev, "device %s registered\n", netdev->name); |
| |
| done: |
| return err; |
| } |
| |
| /* |
| * probe function for new USB2 devices |
| * |
| * check version information and number of available |
| * CAN interfaces |
| */ |
| static int esd_usb2_probe(struct usb_interface *intf, |
| const struct usb_device_id *id) |
| { |
| struct esd_usb2 *dev; |
| struct esd_usb2_msg *msg; |
| int i, err; |
| |
| dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| if (!dev) { |
| err = -ENOMEM; |
| goto done; |
| } |
| |
| dev->udev = interface_to_usbdev(intf); |
| |
| init_usb_anchor(&dev->rx_submitted); |
| |
| usb_set_intfdata(intf, dev); |
| |
| msg = kmalloc(sizeof(*msg), GFP_KERNEL); |
| if (!msg) { |
| err = -ENOMEM; |
| goto free_msg; |
| } |
| |
| /* query number of CAN interfaces (nets) */ |
| msg->msg.hdr.cmd = CMD_VERSION; |
| msg->msg.hdr.len = 2; |
| msg->msg.version.rsvd = 0; |
| msg->msg.version.flags = 0; |
| msg->msg.version.drv_version = 0; |
| |
| err = esd_usb2_send_msg(dev, msg); |
| if (err < 0) { |
| dev_err(&intf->dev, "sending version message failed\n"); |
| goto free_msg; |
| } |
| |
| err = esd_usb2_wait_msg(dev, msg); |
| if (err < 0) { |
| dev_err(&intf->dev, "no version message answer\n"); |
| goto free_msg; |
| } |
| |
| dev->net_count = (int)msg->msg.version_reply.nets; |
| dev->version = le32_to_cpu(msg->msg.version_reply.version); |
| |
| if (device_create_file(&intf->dev, &dev_attr_firmware)) |
| dev_err(&intf->dev, |
| "Couldn't create device file for firmware\n"); |
| |
| if (device_create_file(&intf->dev, &dev_attr_hardware)) |
| dev_err(&intf->dev, |
| "Couldn't create device file for hardware\n"); |
| |
| if (device_create_file(&intf->dev, &dev_attr_nets)) |
| dev_err(&intf->dev, |
| "Couldn't create device file for nets\n"); |
| |
| /* do per device probing */ |
| for (i = 0; i < dev->net_count; i++) |
| esd_usb2_probe_one_net(intf, i); |
| |
| free_msg: |
| kfree(msg); |
| if (err) |
| kfree(dev); |
| done: |
| return err; |
| } |
| |
| /* |
| * called by the usb core when the device is removed from the system |
| */ |
| static void esd_usb2_disconnect(struct usb_interface *intf) |
| { |
| struct esd_usb2 *dev = usb_get_intfdata(intf); |
| struct net_device *netdev; |
| int i; |
| |
| device_remove_file(&intf->dev, &dev_attr_firmware); |
| device_remove_file(&intf->dev, &dev_attr_hardware); |
| device_remove_file(&intf->dev, &dev_attr_nets); |
| |
| usb_set_intfdata(intf, NULL); |
| |
| if (dev) { |
| for (i = 0; i < dev->net_count; i++) { |
| if (dev->nets[i]) { |
| netdev = dev->nets[i]->netdev; |
| unregister_netdev(netdev); |
| free_candev(netdev); |
| } |
| } |
| unlink_all_urbs(dev); |
| kfree(dev); |
| } |
| } |
| |
| /* usb specific object needed to register this driver with the usb subsystem */ |
| static struct usb_driver esd_usb2_driver = { |
| .name = "esd_usb2", |
| .probe = esd_usb2_probe, |
| .disconnect = esd_usb2_disconnect, |
| .id_table = esd_usb2_table, |
| }; |
| |
| module_usb_driver(esd_usb2_driver); |