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1057 lines
24 KiB
1057 lines
24 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* CAN driver for Geschwister Schneider USB/CAN devices |
|
* and bytewerk.org candleLight USB CAN interfaces. |
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* |
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* Copyright (C) 2013-2016 Geschwister Schneider Technologie-, |
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* Entwicklungs- und Vertriebs UG (Haftungsbeschränkt). |
|
* Copyright (C) 2016 Hubert Denkmair |
|
* |
|
* Many thanks to all socketcan devs! |
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*/ |
|
|
|
#include <linux/ethtool.h> |
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#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> |
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#include <linux/can/error.h> |
|
|
|
/* Device specific constants */ |
|
#define USB_GSUSB_1_VENDOR_ID 0x1d50 |
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#define USB_GSUSB_1_PRODUCT_ID 0x606f |
|
|
|
#define USB_CANDLELIGHT_VENDOR_ID 0x1209 |
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#define USB_CANDLELIGHT_PRODUCT_ID 0x2323 |
|
|
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#define GSUSB_ENDPOINT_IN 1 |
|
#define GSUSB_ENDPOINT_OUT 2 |
|
|
|
/* Device specific constants */ |
|
enum gs_usb_breq { |
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GS_USB_BREQ_HOST_FORMAT = 0, |
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GS_USB_BREQ_BITTIMING, |
|
GS_USB_BREQ_MODE, |
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GS_USB_BREQ_BERR, |
|
GS_USB_BREQ_BT_CONST, |
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GS_USB_BREQ_DEVICE_CONFIG, |
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GS_USB_BREQ_TIMESTAMP, |
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GS_USB_BREQ_IDENTIFY, |
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}; |
|
|
|
enum gs_can_mode { |
|
/* reset a channel. turns it off */ |
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GS_CAN_MODE_RESET = 0, |
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/* starts a channel */ |
|
GS_CAN_MODE_START |
|
}; |
|
|
|
enum gs_can_state { |
|
GS_CAN_STATE_ERROR_ACTIVE = 0, |
|
GS_CAN_STATE_ERROR_WARNING, |
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GS_CAN_STATE_ERROR_PASSIVE, |
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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) |
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#define GS_CAN_MODE_TRIPLE_SAMPLE BIT(2) |
|
#define GS_CAN_MODE_ONE_SHOT BIT(3) |
|
|
|
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) |
|
|
|
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; |
|
|
|
#define GS_CAN_FLAG_OVERFLOW 1 |
|
|
|
struct gs_host_frame { |
|
u32 echo_id; |
|
__le32 can_id; |
|
|
|
u8 can_dlc; |
|
u8 channel; |
|
u8 flags; |
|
u8 reserved; |
|
|
|
u8 data[8]; |
|
} __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; |
|
unsigned int channel; /* channel number */ |
|
|
|
/* 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. |
|
*/ |
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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. |
|
*/ |
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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++; |
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} 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; |
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struct net_device *netdev; |
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int rc; |
|
struct net_device_stats *stats; |
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struct gs_host_frame *hf = urb->transfer_buffer; |
|
struct gs_tx_context *txc; |
|
struct can_frame *cf; |
|
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; |
|
|
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if (hf->echo_id == -1) { /* normal rx */ |
|
skb = alloc_can_skb(dev->netdev, &cf); |
|
if (!skb) |
|
return; |
|
|
|
cf->can_id = le32_to_cpu(hf->can_id); |
|
|
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can_frame_set_cc_len(cf, hf->can_dlc, dev->can.ctrlmode); |
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memcpy(cf->data, hf->data, 8); |
|
|
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/* 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++; |
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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 %d\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 %d\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, |
|
sizeof(struct gs_host_frame), |
|
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 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 %d\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; |
|
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, sizeof(*hf), 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 %d\n", idx); |
|
goto badidx; |
|
} |
|
|
|
hf->echo_id = idx; |
|
hf->channel = dev->channel; |
|
|
|
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, |
|
sizeof(*hf), |
|
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, |
|
sizeof(*hf), |
|
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, |
|
sizeof(*hf), |
|
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, |
|
sizeof(struct gs_host_frame), |
|
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, |
|
sizeof(struct gs_host_frame), |
|
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; |
|
|
|
/* 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_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(*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); |
|
} |
|
|
|
/* 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->tseg1_min); |
|
dev->bt_const.tseg1_max = le32_to_cpu(bt_const->tseg1_max); |
|
dev->bt_const.tseg2_min = le32_to_cpu(bt_const->tseg2_min); |
|
dev->bt_const.tseg2_max = le32_to_cpu(bt_const->tseg2_max); |
|
dev->bt_const.sjw_max = le32_to_cpu(bt_const->sjw_max); |
|
dev->bt_const.brp_min = le32_to_cpu(bt_const->brp_min); |
|
dev->bt_const.brp_max = le32_to_cpu(bt_const->brp_max); |
|
dev->bt_const.brp_inc = le32_to_cpu(bt_const->brp_inc); |
|
|
|
dev->udev = interface_to_usbdev(intf); |
|
dev->iface = intf; |
|
dev->netdev = netdev; |
|
dev->channel = channel; |
|
|
|
init_usb_anchor(&dev->tx_submitted); |
|
atomic_set(&dev->active_tx_urbs, 0); |
|
spin_lock_init(&dev->tx_ctx_lock); |
|
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; |
|
} |
|
|
|
/* can setup */ |
|
dev->can.state = CAN_STATE_STOPPED; |
|
dev->can.clock.freq = le32_to_cpu(bt_const->fclk_can); |
|
dev->can.bittiming_const = &dev->bt_const; |
|
dev->can.do_set_bittiming = gs_usb_set_bittiming; |
|
|
|
dev->can.ctrlmode_supported = CAN_CTRLMODE_CC_LEN8_DLC; |
|
|
|
feature = le32_to_cpu(bt_const->feature); |
|
if (feature & GS_CAN_FEATURE_LISTEN_ONLY) |
|
dev->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY; |
|
|
|
if (feature & GS_CAN_FEATURE_LOOP_BACK) |
|
dev->can.ctrlmode_supported |= CAN_CTRLMODE_LOOPBACK; |
|
|
|
if (feature & GS_CAN_FEATURE_TRIPLE_SAMPLE) |
|
dev->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES; |
|
|
|
if (feature & GS_CAN_FEATURE_ONE_SHOT) |
|
dev->can.ctrlmode_supported |= CAN_CTRLMODE_ONE_SHOT; |
|
|
|
SET_NETDEV_DEV(netdev, &intf->dev); |
|
|
|
if (le32_to_cpu(dconf->sw_version) > 1) |
|
if (feature & GS_CAN_FEATURE_IDENTIFY) |
|
netdev->ethtool_ops = &gs_usb_ethtool_ops; |
|
|
|
kfree(bt_const); |
|
|
|
rc = register_candev(dev->netdev); |
|
if (rc) { |
|
free_candev(dev->netdev); |
|
dev_err(&intf->dev, "Couldn't register candev (err=%d)\n", rc); |
|
return ERR_PTR(rc); |
|
} |
|
|
|
return dev; |
|
} |
|
|
|
static void gs_destroy_candev(struct gs_can *dev) |
|
{ |
|
unregister_candev(dev->netdev); |
|
usb_kill_anchored_urbs(&dev->tx_submitted); |
|
free_candev(dev->netdev); |
|
} |
|
|
|
static int gs_usb_probe(struct usb_interface *intf, |
|
const struct usb_device_id *id) |
|
{ |
|
struct gs_usb *dev; |
|
int rc = -ENOMEM; |
|
unsigned int icount, i; |
|
struct gs_host_config *hconf; |
|
struct gs_device_config *dconf; |
|
|
|
hconf = kmalloc(sizeof(*hconf), GFP_KERNEL); |
|
if (!hconf) |
|
return -ENOMEM; |
|
|
|
hconf->byte_order = cpu_to_le32(0x0000beef); |
|
|
|
/* send host config */ |
|
rc = usb_control_msg(interface_to_usbdev(intf), |
|
usb_sndctrlpipe(interface_to_usbdev(intf), 0), |
|
GS_USB_BREQ_HOST_FORMAT, |
|
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE, |
|
1, |
|
intf->cur_altsetting->desc.bInterfaceNumber, |
|
hconf, |
|
sizeof(*hconf), |
|
1000); |
|
|
|
kfree(hconf); |
|
|
|
if (rc < 0) { |
|
dev_err(&intf->dev, "Couldn't send data format (err=%d)\n", |
|
rc); |
|
return rc; |
|
} |
|
|
|
dconf = kmalloc(sizeof(*dconf), GFP_KERNEL); |
|
if (!dconf) |
|
return -ENOMEM; |
|
|
|
/* read device config */ |
|
rc = usb_control_msg(interface_to_usbdev(intf), |
|
usb_rcvctrlpipe(interface_to_usbdev(intf), 0), |
|
GS_USB_BREQ_DEVICE_CONFIG, |
|
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE, |
|
1, |
|
intf->cur_altsetting->desc.bInterfaceNumber, |
|
dconf, |
|
sizeof(*dconf), |
|
1000); |
|
if (rc < 0) { |
|
dev_err(&intf->dev, "Couldn't get device config: (err=%d)\n", |
|
rc); |
|
kfree(dconf); |
|
return rc; |
|
} |
|
|
|
icount = dconf->icount + 1; |
|
dev_info(&intf->dev, "Configuring for %d interfaces\n", icount); |
|
|
|
if (icount > GS_MAX_INTF) { |
|
dev_err(&intf->dev, |
|
"Driver cannot handle more that %d CAN interfaces\n", |
|
GS_MAX_INTF); |
|
kfree(dconf); |
|
return -EINVAL; |
|
} |
|
|
|
dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
|
if (!dev) { |
|
kfree(dconf); |
|
return -ENOMEM; |
|
} |
|
|
|
init_usb_anchor(&dev->rx_submitted); |
|
|
|
atomic_set(&dev->active_channels, 0); |
|
|
|
usb_set_intfdata(intf, dev); |
|
dev->udev = interface_to_usbdev(intf); |
|
|
|
for (i = 0; i < icount; i++) { |
|
dev->canch[i] = gs_make_candev(i, intf, dconf); |
|
if (IS_ERR_OR_NULL(dev->canch[i])) { |
|
/* save error code to return later */ |
|
rc = PTR_ERR(dev->canch[i]); |
|
|
|
/* on failure destroy previously created candevs */ |
|
icount = i; |
|
for (i = 0; i < icount; i++) |
|
gs_destroy_candev(dev->canch[i]); |
|
|
|
usb_kill_anchored_urbs(&dev->rx_submitted); |
|
kfree(dconf); |
|
kfree(dev); |
|
return rc; |
|
} |
|
dev->canch[i]->parent = dev; |
|
} |
|
|
|
kfree(dconf); |
|
|
|
return 0; |
|
} |
|
|
|
static void gs_usb_disconnect(struct usb_interface *intf) |
|
{ |
|
unsigned i; |
|
struct gs_usb *dev = usb_get_intfdata(intf); |
|
usb_set_intfdata(intf, NULL); |
|
|
|
if (!dev) { |
|
dev_err(&intf->dev, "Disconnect (nodata)\n"); |
|
return; |
|
} |
|
|
|
for (i = 0; i < GS_MAX_INTF; i++) |
|
if (dev->canch[i]) |
|
gs_destroy_candev(dev->canch[i]); |
|
|
|
usb_kill_anchored_urbs(&dev->rx_submitted); |
|
kfree(dev); |
|
} |
|
|
|
static const struct usb_device_id gs_usb_table[] = { |
|
{ USB_DEVICE_INTERFACE_NUMBER(USB_GSUSB_1_VENDOR_ID, |
|
USB_GSUSB_1_PRODUCT_ID, 0) }, |
|
{ USB_DEVICE_INTERFACE_NUMBER(USB_CANDLELIGHT_VENDOR_ID, |
|
USB_CANDLELIGHT_PRODUCT_ID, 0) }, |
|
{} /* Terminating entry */ |
|
}; |
|
|
|
MODULE_DEVICE_TABLE(usb, gs_usb_table); |
|
|
|
static struct usb_driver gs_usb_driver = { |
|
.name = "gs_usb", |
|
.probe = gs_usb_probe, |
|
.disconnect = gs_usb_disconnect, |
|
.id_table = gs_usb_table, |
|
}; |
|
|
|
module_usb_driver(gs_usb_driver); |
|
|
|
MODULE_AUTHOR("Maximilian Schneider <[email protected]>"); |
|
MODULE_DESCRIPTION( |
|
"Socket CAN device driver for Geschwister Schneider Technologie-, " |
|
"Entwicklungs- und Vertriebs UG. USB2.0 to CAN interfaces\n" |
|
"and bytewerk.org candleLight USB CAN interfaces."); |
|
MODULE_LICENSE("GPL v2");
|
|
|