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gs_usb.c
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// SPDX-License-Identifier: GPL-2.0-only
/* CAN driver for Geschwister Schneider USB/CAN devices
* and bytewerk.org candleLight USB CAN interfaces.
*
* Copyright (C) 2013-2016 Geschwister Schneider Technologie-,
* Entwicklungs- und Vertriebs UG (Haftungsbeschränkt).
* Copyright (C) 2016 Hubert Denkmair
*
* Many thanks to all socketcan devs!
*/
#include <linux/ethtool.h>
#include <linux/init.h>
#include <linux/signal.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>
/* Device specific constants */
#define USB_GSUSB_1_VENDOR_ID 0x1d50
#define USB_GSUSB_1_PRODUCT_ID 0x606f
#define USB_CANDLELIGHT_VENDOR_ID 0x1209
#define USB_CANDLELIGHT_PRODUCT_ID 0x2323
#define USB_CES_CANEXT_FD_VENDOR_ID 0x1cd2
#define USB_CES_CANEXT_FD_PRODUCT_ID 0x606f
#define USB_CAN_DEBUGGER_VENDOR_ID 0x16d0
#define USB_CAN_DEBUGGER_PRODUCT_ID 0x10b8
#define GSUSB_ENDPOINT_IN 1
#define GSUSB_ENDPOINT_OUT 2
/* Device specific constants */
enum gs_usb_breq {
GS_USB_BREQ_HOST_FORMAT = 0,
GS_USB_BREQ_BITTIMING,
GS_USB_BREQ_MODE,
GS_USB_BREQ_BERR,
GS_USB_BREQ_BT_CONST,
GS_USB_BREQ_DEVICE_CONFIG,
GS_USB_BREQ_TIMESTAMP,
GS_USB_BREQ_IDENTIFY,
GS_USB_BREQ_DATA_BITTIMING,
};
enum gs_can_mode {
/* reset a channel. turns it off */
GS_CAN_MODE_RESET = 0,
/* starts a channel */
GS_CAN_MODE_START
};
enum gs_can_state {
GS_CAN_STATE_ERROR_ACTIVE = 0,
GS_CAN_STATE_ERROR_WARNING,
GS_CAN_STATE_ERROR_PASSIVE,
GS_CAN_STATE_BUS_OFF,
GS_CAN_STATE_STOPPED,
GS_CAN_STATE_SLEEPING
};
enum gs_can_identify_mode {
GS_CAN_IDENTIFY_OFF = 0,
GS_CAN_IDENTIFY_ON
};
/* data types passed between host and device */
/* The firmware on the original USB2CAN by Geschwister Schneider
* Technologie Entwicklungs- und Vertriebs UG exchanges all data
* between the host and the device in host byte order. This is done
* with the struct gs_host_config::byte_order member, which is sent
* first to indicate the desired byte order.
*
* The widely used open source firmware candleLight doesn't support
* this feature and exchanges the data in little endian byte order.
*/
struct gs_host_config {
__le32 byte_order;
} __packed;
struct gs_device_config {
u8 reserved1;
u8 reserved2;
u8 reserved3;
u8 icount;
__le32 sw_version;
__le32 hw_version;
} __packed;
#define GS_CAN_MODE_NORMAL 0
#define GS_CAN_MODE_LISTEN_ONLY BIT(0)
#define GS_CAN_MODE_LOOP_BACK BIT(1)
#define GS_CAN_MODE_TRIPLE_SAMPLE BIT(2)
#define GS_CAN_MODE_ONE_SHOT BIT(3)
#define GS_CAN_MODE_FD BIT(8)
struct gs_device_mode {
__le32 mode;
__le32 flags;
} __packed;
struct gs_device_state {
__le32 state;
__le32 rxerr;
__le32 txerr;
} __packed;
struct gs_device_bittiming {
__le32 prop_seg;
__le32 phase_seg1;
__le32 phase_seg2;
__le32 sjw;
__le32 brp;
} __packed;
struct gs_identify_mode {
__le32 mode;
} __packed;
#define GS_CAN_FEATURE_LISTEN_ONLY BIT(0)
#define GS_CAN_FEATURE_LOOP_BACK BIT(1)
#define GS_CAN_FEATURE_TRIPLE_SAMPLE BIT(2)
#define GS_CAN_FEATURE_ONE_SHOT BIT(3)
#define GS_CAN_FEATURE_HW_TIMESTAMP BIT(4)
#define GS_CAN_FEATURE_IDENTIFY BIT(5)
#define GS_CAN_FEATURE_USER_ID BIT(6)
#define GS_CAN_FEATURE_PAD_PKTS_TO_MAX_PKT_SIZE BIT(7)
#define GS_CAN_FEATURE_FD BIT(8)
#define GS_CAN_FEATURE_REQ_USB_QUIRK BIT(9)
struct gs_device_bt_const {
__le32 feature;
__le32 fclk_can;
__le32 tseg1_min;
__le32 tseg1_max;
__le32 tseg2_min;
__le32 tseg2_max;
__le32 sjw_max;
__le32 brp_min;
__le32 brp_max;
__le32 brp_inc;
} __packed;
struct gs_device_extended_bt_const {
struct gs_device_bt_const bt;
__le32 dtseg1_min;
__le32 dtseg1_max;
__le32 dtseg2_min;
__le32 dtseg2_max;
__le32 dsjw_max;
__le32 dbrp_min;
__le32 dbrp_max;
__le32 dbrp_inc;
} __packed;
#define GS_CAN_FLAG_OVERFLOW BIT(0)
#define GS_CAN_FLAG_FD BIT(1)
#define GS_CAN_FLAG_BRS BIT(2)
#define GS_CAN_FLAG_ESI BIT(3)
#define GS_CAN_CLASSIC_DATA_SIZE 8
#define GS_CAN_FD_DATA_SIZE 64
/* Workaround for "USB high-speed device in endpoint TX data corruption"
* on NXP LPC546xx controllers (Errata sheet LPC546xx 3.22 USB.15)
*/
#define GS_CAN_FD_DATA_ERRATA_SIZE 65
struct gs_host_frame {
u32 echo_id;
__le32 can_id;
u8 can_dlc;
u8 channel;
u8 flags;
u8 reserved;
u8 data[];
} __packed;
/* The GS USB devices make use of the same flags and masks as in
* linux/can.h and linux/can/error.h, and no additional mapping is necessary.
*/
/* Only send a max of GS_MAX_TX_URBS frames per channel at a time. */
#define GS_MAX_TX_URBS 10
/* Only launch a max of GS_MAX_RX_URBS usb requests at a time. */
#define GS_MAX_RX_URBS 30
/* Maximum number of interfaces the driver supports per device.
* Current hardware only supports 2 interfaces. The future may vary.
*/
#define GS_MAX_INTF 2
struct gs_tx_context {
struct gs_can *dev;
unsigned int echo_id;
};
struct gs_can {
struct can_priv can; /* must be the first member */
struct gs_usb *parent;
struct net_device *netdev;
struct usb_device *udev;
struct usb_interface *iface;
struct can_bittiming_const bt_const;
struct can_bittiming_const data_bt_const;
unsigned int channel; /* channel number */
/* Size of frame - will change depending on FD capability */
size_t gs_frame_xmit_size;
/* This lock prevents a race condition between xmit and receive. */
spinlock_t tx_ctx_lock;
struct gs_tx_context tx_context[GS_MAX_TX_URBS];
struct usb_anchor tx_submitted;
atomic_t active_tx_urbs;
};
/* usb interface struct */
struct gs_usb {
struct gs_can *canch[GS_MAX_INTF];
struct usb_anchor rx_submitted;
atomic_t active_channels;
struct usb_device *udev;
};
/* 'allocate' a tx context.
* returns a valid tx context or NULL if there is no space.
*/
static struct gs_tx_context *gs_alloc_tx_context(struct gs_can *dev)
{
int i = 0;
unsigned long flags;
spin_lock_irqsave(&dev->tx_ctx_lock, flags);
for (; i < GS_MAX_TX_URBS; i++) {
if (dev->tx_context[i].echo_id == GS_MAX_TX_URBS) {
dev->tx_context[i].echo_id = i;
spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
return &dev->tx_context[i];
}
}
spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
return NULL;
}
/* releases a tx context
*/
static void gs_free_tx_context(struct gs_tx_context *txc)
{
txc->echo_id = GS_MAX_TX_URBS;
}
/* Get a tx context by id.
*/
static struct gs_tx_context *gs_get_tx_context(struct gs_can *dev,
unsigned int id)
{
unsigned long flags;
if (id < GS_MAX_TX_URBS) {
spin_lock_irqsave(&dev->tx_ctx_lock, flags);
if (dev->tx_context[id].echo_id == id) {
spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
return &dev->tx_context[id];
}
spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
}
return NULL;
}
static int gs_cmd_reset(struct gs_can *gsdev)
{
struct gs_device_mode *dm;
struct usb_interface *intf = gsdev->iface;
int rc;
dm = kzalloc(sizeof(*dm), GFP_KERNEL);
if (!dm)
return -ENOMEM;
dm->mode = GS_CAN_MODE_RESET;
rc = usb_control_msg(interface_to_usbdev(intf),
usb_sndctrlpipe(interface_to_usbdev(intf), 0),
GS_USB_BREQ_MODE,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
gsdev->channel,
0,
dm,
sizeof(*dm),
1000);
kfree(dm);
return rc;
}
static void gs_update_state(struct gs_can *dev, struct can_frame *cf)
{
struct can_device_stats *can_stats = &dev->can.can_stats;
if (cf->can_id & CAN_ERR_RESTARTED) {
dev->can.state = CAN_STATE_ERROR_ACTIVE;
can_stats->restarts++;
} else if (cf->can_id & CAN_ERR_BUSOFF) {
dev->can.state = CAN_STATE_BUS_OFF;
can_stats->bus_off++;
} else if (cf->can_id & CAN_ERR_CRTL) {
if ((cf->data[1] & CAN_ERR_CRTL_TX_WARNING) ||
(cf->data[1] & CAN_ERR_CRTL_RX_WARNING)) {
dev->can.state = CAN_STATE_ERROR_WARNING;
can_stats->error_warning++;
} else if ((cf->data[1] & CAN_ERR_CRTL_TX_PASSIVE) ||
(cf->data[1] & CAN_ERR_CRTL_RX_PASSIVE)) {
dev->can.state = CAN_STATE_ERROR_PASSIVE;
can_stats->error_passive++;
} else {
dev->can.state = CAN_STATE_ERROR_ACTIVE;
}
}
}
static void gs_usb_receive_bulk_callback(struct urb *urb)
{
struct gs_usb *usbcan = urb->context;
struct gs_can *dev;
struct net_device *netdev;
int rc;
struct net_device_stats *stats;
struct gs_host_frame *hf = urb->transfer_buffer;
struct gs_tx_context *txc;
struct can_frame *cf;
struct canfd_frame *cfd;
struct sk_buff *skb;
BUG_ON(!usbcan);
switch (urb->status) {
case 0: /* success */
break;
case -ENOENT:
case -ESHUTDOWN:
return;
default:
/* do not resubmit aborted urbs. eg: when device goes down */
return;
}
/* device reports out of range channel id */
if (hf->channel >= GS_MAX_INTF)
goto resubmit_urb;
dev = usbcan->canch[hf->channel];
netdev = dev->netdev;
stats = &netdev->stats;
if (!netif_device_present(netdev))
return;
if (hf->echo_id == -1) { /* normal rx */
if (hf->flags & GS_CAN_FLAG_FD) {
skb = alloc_canfd_skb(dev->netdev, &cfd);
if (!skb)
return;
cfd->can_id = le32_to_cpu(hf->can_id);
cfd->len = can_fd_dlc2len(hf->can_dlc);
if (hf->flags & GS_CAN_FLAG_BRS) {
cfd->flags |= CANFD_BRS;
}
if (hf->flags & GS_CAN_FLAG_ESI) {
cfd->flags |= CANFD_ESI;
}
memcpy(cfd->data, hf->data, cfd->len);
} else {
skb = alloc_can_skb(dev->netdev, &cf);
if (!skb)
return;
cf->can_id = le32_to_cpu(hf->can_id);
can_frame_set_cc_len(cf, hf->can_dlc, dev->can.ctrlmode);
memcpy(cf->data, hf->data, 8);
/* ERROR frames tell us information about the controller */
if (le32_to_cpu(hf->can_id) & CAN_ERR_FLAG)
gs_update_state(dev, cf);
}
netdev->stats.rx_packets++;
netdev->stats.rx_bytes += hf->can_dlc;
netif_rx(skb);
} else { /* echo_id == hf->echo_id */
if (hf->echo_id >= GS_MAX_TX_URBS) {
netdev_err(netdev,
"Unexpected out of range echo id %u\n",
hf->echo_id);
goto resubmit_urb;
}
netdev->stats.tx_packets++;
netdev->stats.tx_bytes += hf->can_dlc;
txc = gs_get_tx_context(dev, hf->echo_id);
/* bad devices send bad echo_ids. */
if (!txc) {
netdev_err(netdev,
"Unexpected unused echo id %u\n",
hf->echo_id);
goto resubmit_urb;
}
can_get_echo_skb(netdev, hf->echo_id, NULL);
gs_free_tx_context(txc);
atomic_dec(&dev->active_tx_urbs);
netif_wake_queue(netdev);
}
if (hf->flags & GS_CAN_FLAG_OVERFLOW) {
skb = alloc_can_err_skb(netdev, &cf);
if (!skb)
goto resubmit_urb;
cf->can_id |= CAN_ERR_CRTL;
cf->len = CAN_ERR_DLC;
cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
stats->rx_over_errors++;
stats->rx_errors++;
netif_rx(skb);
}
resubmit_urb:
usb_fill_bulk_urb(urb,
usbcan->udev,
usb_rcvbulkpipe(usbcan->udev, GSUSB_ENDPOINT_IN),
hf,
dev->gs_frame_xmit_size,
gs_usb_receive_bulk_callback,
usbcan
);
rc = usb_submit_urb(urb, GFP_ATOMIC);
/* USB failure take down all interfaces */
if (rc == -ENODEV) {
for (rc = 0; rc < GS_MAX_INTF; rc++) {
if (usbcan->canch[rc])
netif_device_detach(usbcan->canch[rc]->netdev);
}
}
}
static int gs_usb_set_bittiming(struct net_device *netdev)
{
struct gs_can *dev = netdev_priv(netdev);
struct can_bittiming *bt = &dev->can.bittiming;
struct usb_interface *intf = dev->iface;
int rc;
struct gs_device_bittiming *dbt;
dbt = kmalloc(sizeof(*dbt), GFP_KERNEL);
if (!dbt)
return -ENOMEM;
dbt->prop_seg = cpu_to_le32(bt->prop_seg);
dbt->phase_seg1 = cpu_to_le32(bt->phase_seg1);
dbt->phase_seg2 = cpu_to_le32(bt->phase_seg2);
dbt->sjw = cpu_to_le32(bt->sjw);
dbt->brp = cpu_to_le32(bt->brp);
/* request bit timings */
rc = usb_control_msg(interface_to_usbdev(intf),
usb_sndctrlpipe(interface_to_usbdev(intf), 0),
GS_USB_BREQ_BITTIMING,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
dev->channel,
0,
dbt,
sizeof(*dbt),
1000);
kfree(dbt);
if (rc < 0)
dev_err(netdev->dev.parent, "Couldn't set bittimings (err=%d)",
rc);
return (rc > 0) ? 0 : rc;
}
static int gs_usb_set_data_bittiming(struct net_device *netdev)
{
struct gs_can *dev = netdev_priv(netdev);
struct can_bittiming *bt = &dev->can.data_bittiming;
struct usb_interface *intf = dev->iface;
int rc;
struct gs_device_bittiming *dbt;
dbt = kmalloc(sizeof(*dbt), GFP_KERNEL);
if (!dbt)
return -ENOMEM;
dbt->prop_seg = cpu_to_le32(bt->prop_seg);
dbt->phase_seg1 = cpu_to_le32(bt->phase_seg1);
dbt->phase_seg2 = cpu_to_le32(bt->phase_seg2);
dbt->sjw = cpu_to_le32(bt->sjw);
dbt->brp = cpu_to_le32(bt->brp);
/* request bit timings */
rc = usb_control_msg(interface_to_usbdev(intf),
usb_sndctrlpipe(interface_to_usbdev(intf), 0),
GS_USB_BREQ_DATA_BITTIMING,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
dev->channel,
0,
dbt,
sizeof(*dbt),
1000);
kfree(dbt);
if (rc < 0)
dev_err(netdev->dev.parent, "Couldn't set data bittimings (err=%d)",
rc);
return (rc > 0) ? 0 : rc;
}
static void gs_usb_xmit_callback(struct urb *urb)
{
struct gs_tx_context *txc = urb->context;
struct gs_can *dev = txc->dev;
struct net_device *netdev = dev->netdev;
if (urb->status)
netdev_info(netdev, "usb xmit fail %u\n", txc->echo_id);
usb_free_coherent(urb->dev,
urb->transfer_buffer_length,
urb->transfer_buffer,
urb->transfer_dma);
}
static netdev_tx_t gs_can_start_xmit(struct sk_buff *skb,
struct net_device *netdev)
{
struct gs_can *dev = netdev_priv(netdev);
struct net_device_stats *stats = &dev->netdev->stats;
struct urb *urb;
struct gs_host_frame *hf;
struct can_frame *cf;
struct canfd_frame *cfd;
int rc;
unsigned int idx;
struct gs_tx_context *txc;
if (can_dropped_invalid_skb(netdev, skb))
return NETDEV_TX_OK;
/* find an empty context to keep track of transmission */
txc = gs_alloc_tx_context(dev);
if (!txc)
return NETDEV_TX_BUSY;
/* create a URB, and a buffer for it */
urb = usb_alloc_urb(0, GFP_ATOMIC);
if (!urb)
goto nomem_urb;
hf = usb_alloc_coherent(dev->udev, dev->gs_frame_xmit_size, GFP_ATOMIC,
&urb->transfer_dma);
if (!hf) {
netdev_err(netdev, "No memory left for USB buffer\n");
goto nomem_hf;
}
idx = txc->echo_id;
if (idx >= GS_MAX_TX_URBS) {
netdev_err(netdev, "Invalid tx context %u\n", idx);
goto badidx;
}
hf->echo_id = idx;
hf->channel = dev->channel;
hf->flags = 0;
if (skb->len == CANFD_MTU) {
cfd = (struct canfd_frame *)skb->data;
hf->can_id = cpu_to_le32(cfd->can_id);
hf->flags |= GS_CAN_FLAG_FD;
if (cfd->flags & CANFD_BRS) {
hf->flags |= GS_CAN_FLAG_BRS;
}
if (cfd->flags & CANFD_ESI) {
hf->flags |= GS_CAN_FLAG_ESI;
}
hf->can_dlc = can_fd_len2dlc(cfd->len);
memcpy(hf->data, cfd->data, cfd->len);
} else {
cf = (struct can_frame *)skb->data;
hf->can_id = cpu_to_le32(cf->can_id);
hf->can_dlc = can_get_cc_dlc(cf, dev->can.ctrlmode);
memcpy(hf->data, cf->data, cf->len);
}
usb_fill_bulk_urb(urb, dev->udev,
usb_sndbulkpipe(dev->udev, GSUSB_ENDPOINT_OUT),
hf,
dev->gs_frame_xmit_size,
gs_usb_xmit_callback,
txc);
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
usb_anchor_urb(urb, &dev->tx_submitted);
can_put_echo_skb(skb, netdev, idx, 0);
atomic_inc(&dev->active_tx_urbs);
rc = usb_submit_urb(urb, GFP_ATOMIC);
if (unlikely(rc)) { /* usb send failed */
atomic_dec(&dev->active_tx_urbs);
can_free_echo_skb(netdev, idx, NULL);
gs_free_tx_context(txc);
usb_unanchor_urb(urb);
usb_free_coherent(dev->udev,
dev->gs_frame_xmit_size,
hf,
urb->transfer_dma);
if (rc == -ENODEV) {
netif_device_detach(netdev);
} else {
netdev_err(netdev, "usb_submit failed (err=%d)\n", rc);
stats->tx_dropped++;
}
} else {
/* Slow down tx path */
if (atomic_read(&dev->active_tx_urbs) >= GS_MAX_TX_URBS)
netif_stop_queue(netdev);
}
/* let usb core take care of this urb */
usb_free_urb(urb);
return NETDEV_TX_OK;
badidx:
usb_free_coherent(dev->udev,
dev->gs_frame_xmit_size,
hf,
urb->transfer_dma);
nomem_hf:
usb_free_urb(urb);
nomem_urb:
gs_free_tx_context(txc);
dev_kfree_skb(skb);
stats->tx_dropped++;
return NETDEV_TX_OK;
}
static int gs_can_open(struct net_device *netdev)
{
struct gs_can *dev = netdev_priv(netdev);
struct gs_usb *parent = dev->parent;
int rc, i;
struct gs_device_mode *dm;
u32 ctrlmode;
u32 flags = 0;
rc = open_candev(netdev);
if (rc)
return rc;
if (atomic_add_return(1, &parent->active_channels) == 1) {
for (i = 0; i < GS_MAX_RX_URBS; i++) {
struct urb *urb;
u8 *buf;
/* alloc rx urb */
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb)
return -ENOMEM;
/* alloc rx buffer */
buf = usb_alloc_coherent(dev->udev,
dev->gs_frame_xmit_size,
GFP_KERNEL,
&urb->transfer_dma);
if (!buf) {
netdev_err(netdev,
"No memory left for USB buffer\n");
usb_free_urb(urb);
return -ENOMEM;
}
/* fill, anchor, and submit rx urb */
usb_fill_bulk_urb(urb,
dev->udev,
usb_rcvbulkpipe(dev->udev,
GSUSB_ENDPOINT_IN),
buf,
dev->gs_frame_xmit_size,
gs_usb_receive_bulk_callback,
parent);
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
usb_anchor_urb(urb, &parent->rx_submitted);
rc = usb_submit_urb(urb, GFP_KERNEL);
if (rc) {
if (rc == -ENODEV)
netif_device_detach(dev->netdev);
netdev_err(netdev,
"usb_submit failed (err=%d)\n",
rc);
usb_unanchor_urb(urb);
usb_free_urb(urb);
break;
}
/* Drop reference,
* USB core will take care of freeing it
*/
usb_free_urb(urb);
}
}
dm = kmalloc(sizeof(*dm), GFP_KERNEL);
if (!dm)
return -ENOMEM;
/* flags */
ctrlmode = dev->can.ctrlmode;
if (ctrlmode & CAN_CTRLMODE_LOOPBACK)
flags |= GS_CAN_MODE_LOOP_BACK;
else if (ctrlmode & CAN_CTRLMODE_LISTENONLY)
flags |= GS_CAN_MODE_LISTEN_ONLY;
/* Controller is not allowed to retry TX
* this mode is unavailable on atmels uc3c hardware
*/
if (ctrlmode & CAN_CTRLMODE_ONE_SHOT)
flags |= GS_CAN_MODE_ONE_SHOT;
if (ctrlmode & CAN_CTRLMODE_3_SAMPLES)
flags |= GS_CAN_MODE_TRIPLE_SAMPLE;
if (ctrlmode & CAN_CTRLMODE_FD)
flags |= GS_CAN_MODE_FD;
/* finally start device */
dm->mode = cpu_to_le32(GS_CAN_MODE_START);
dm->flags = cpu_to_le32(flags);
rc = usb_control_msg(interface_to_usbdev(dev->iface),
usb_sndctrlpipe(interface_to_usbdev(dev->iface), 0),
GS_USB_BREQ_MODE,
USB_DIR_OUT | USB_TYPE_VENDOR |
USB_RECIP_INTERFACE,
dev->channel,
0,
dm,
sizeof(*dm),
1000);
if (rc < 0) {
netdev_err(netdev, "Couldn't start device (err=%d)\n", rc);
kfree(dm);
return rc;
}
kfree(dm);
dev->can.state = CAN_STATE_ERROR_ACTIVE;
if (!(dev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY))
netif_start_queue(netdev);
return 0;
}
static int gs_can_close(struct net_device *netdev)
{
int rc;
struct gs_can *dev = netdev_priv(netdev);
struct gs_usb *parent = dev->parent;
netif_stop_queue(netdev);
/* Stop polling */
if (atomic_dec_and_test(&parent->active_channels))
usb_kill_anchored_urbs(&parent->rx_submitted);
/* Stop sending URBs */
usb_kill_anchored_urbs(&dev->tx_submitted);
atomic_set(&dev->active_tx_urbs, 0);
/* reset the device */
rc = gs_cmd_reset(dev);
if (rc < 0)
netdev_warn(netdev, "Couldn't shutdown device (err=%d)", rc);
/* reset tx contexts */
for (rc = 0; rc < GS_MAX_TX_URBS; rc++) {
dev->tx_context[rc].dev = dev;
dev->tx_context[rc].echo_id = GS_MAX_TX_URBS;
}
/* close the netdev */
close_candev(netdev);
return 0;
}
static const struct net_device_ops gs_usb_netdev_ops = {
.ndo_open = gs_can_open,
.ndo_stop = gs_can_close,
.ndo_start_xmit = gs_can_start_xmit,
.ndo_change_mtu = can_change_mtu,
};
static int gs_usb_set_identify(struct net_device *netdev, bool do_identify)
{
struct gs_can *dev = netdev_priv(netdev);
struct gs_identify_mode *imode;
int rc;
imode = kmalloc(sizeof(*imode), GFP_KERNEL);
if (!imode)
return -ENOMEM;
if (do_identify)
imode->mode = cpu_to_le32(GS_CAN_IDENTIFY_ON);
else
imode->mode = cpu_to_le32(GS_CAN_IDENTIFY_OFF);
rc = usb_control_msg(interface_to_usbdev(dev->iface),
usb_sndctrlpipe(interface_to_usbdev(dev->iface),
0),
GS_USB_BREQ_IDENTIFY,
USB_DIR_OUT | USB_TYPE_VENDOR |
USB_RECIP_INTERFACE,
dev->channel,
0,
imode,
sizeof(*imode),
100);
kfree(imode);
return (rc > 0) ? 0 : rc;
}
/* blink LED's for finding the this interface */
static int gs_usb_set_phys_id(struct net_device *dev,
enum ethtool_phys_id_state state)
{
int rc = 0;
switch (state) {
case ETHTOOL_ID_ACTIVE:
rc = gs_usb_set_identify(dev, GS_CAN_IDENTIFY_ON);
break;
case ETHTOOL_ID_INACTIVE:
rc = gs_usb_set_identify(dev, GS_CAN_IDENTIFY_OFF);
break;
default:
break;
}
return rc;
}
static const struct ethtool_ops gs_usb_ethtool_ops = {
.set_phys_id = gs_usb_set_phys_id,
};
static struct gs_can *gs_make_candev(unsigned int channel,
struct usb_interface *intf,
struct gs_device_config *dconf)
{
struct gs_can *dev;
struct net_device *netdev;
int rc;
struct gs_device_extended_bt_const *bt_const;
u32 feature;
bt_const = kmalloc(sizeof(*bt_const), GFP_KERNEL);
if (!bt_const)
return ERR_PTR(-ENOMEM);
/* fetch bit timing constants */
rc = usb_control_msg(interface_to_usbdev(intf),
usb_rcvctrlpipe(interface_to_usbdev(intf), 0),
GS_USB_BREQ_BT_CONST,
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
channel,
0,
bt_const,
sizeof(struct gs_device_bt_const),
1000);
if (rc < 0) {
dev_err(&intf->dev,
"Couldn't get bit timing const for channel (err=%d)\n",
rc);
kfree(bt_const);
return ERR_PTR(rc);
}
/* If device has reported FD capability, request full bt constraints */
feature = le32_to_cpu(bt_const->bt.feature);
if (feature & GS_CAN_FEATURE_FD)
{
dev_info(&intf->dev, "Device reported FD capability\n");
/* fetch bit timing constants */
rc = usb_control_msg(interface_to_usbdev(intf),
usb_rcvctrlpipe(interface_to_usbdev(intf), 0),
GS_USB_BREQ_BT_CONST,
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
channel,
0,
bt_const,
sizeof(struct gs_device_extended_bt_const),
1000);
if (rc < 0) {
dev_err(&intf->dev,
"Couldn't get bit timing const for channel (err=%d)\n",
rc);
kfree(bt_const);
return ERR_PTR(rc);
}
feature = le32_to_cpu(bt_const->bt.feature);
}
/* create netdev */
netdev = alloc_candev(sizeof(struct gs_can), GS_MAX_TX_URBS);
if (!netdev) {
dev_err(&intf->dev, "Couldn't allocate candev\n");
kfree(bt_const);
return ERR_PTR(-ENOMEM);
}
dev = netdev_priv(netdev);
netdev->netdev_ops = &gs_usb_netdev_ops;
netdev->flags |= IFF_ECHO; /* we support full roundtrip echo */
/* dev setup */
strcpy(dev->bt_const.name, "gs_usb");
dev->bt_const.tseg1_min = le32_to_cpu(bt_const->bt.tseg1_min);
dev->bt_const.tseg1_max = le32_to_cpu(bt_const->bt.tseg1_max);
dev->bt_const.tseg2_min = le32_to_cpu(bt_const->bt.tseg2_min);
dev->bt_const.tseg2_max = le32_to_cpu(bt_const->bt.tseg2_max);
dev->bt_const.sjw_max = le32_to_cpu(bt_const->bt.sjw_max);
dev->bt_const.brp_min = le32_to_cpu(bt_const->bt.brp_min);
dev->bt_const.brp_max = le32_to_cpu(bt_const->bt.brp_max);
dev->bt_const.brp_inc = le32_to_cpu(bt_const->bt.brp_inc);
if (feature & GS_CAN_FEATURE_FD)
{
dev->data_bt_const.tseg1_min = le32_to_cpu(bt_const->dtseg1_min);
dev->data_bt_const.tseg1_max = le32_to_cpu(bt_const->dtseg1_max);
dev->data_bt_const.tseg2_min = le32_to_cpu(bt_const->dtseg2_min);
dev->data_bt_const.tseg2_max = le32_to_cpu(bt_const->dtseg2_max);
dev->data_bt_const.sjw_max = le32_to_cpu(bt_const->dsjw_max);
dev->data_bt_const.brp_min = le32_to_cpu(bt_const->dbrp_min);
dev->data_bt_const.brp_max = le32_to_cpu(bt_const->dbrp_max);
dev->data_bt_const.brp_inc = le32_to_cpu(bt_const->dbrp_inc);
}