forked from mirrors/linux
can: gs_usb: Added support for the GS_USB CAN devices
The Geschwister Schneider Family of devices are galvanically isolated USB2.0 to CAN2.0A/B adapters. Currently two form factors are available, a tethered dongle in a rugged enclosure, and mini-pci-e card. Signed-off-by: Maximilian Schneider <max@schneidersoft.net> Acked-by: Wolfgang Grandegger <wg@grandegger.com> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Maximilian Schneider
Marc Kleine-Budde
parent
277bd320e7
commit
d08e973a77
3 changed files with 980 additions and 0 deletions
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@ -13,6 +13,14 @@ config CAN_ESD_USB2
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This driver supports the CAN-USB/2 interface
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from esd electronic system design gmbh (http://www.esd.eu).
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config CAN_GS_USB
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tristate "Geschwister Schneider UG interfaces"
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---help---
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This driver supports the Geschwister Schneider USB/CAN devices.
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If unsure choose N,
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choose Y for built in support,
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M to compile as module (module will be named: gs_usb).
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config CAN_KVASER_USB
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tristate "Kvaser CAN/USB interface"
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---help---
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@ -4,6 +4,7 @@
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obj-$(CONFIG_CAN_EMS_USB) += ems_usb.o
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obj-$(CONFIG_CAN_ESD_USB2) += esd_usb2.o
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obj-$(CONFIG_CAN_GS_USB) += gs_usb.o
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obj-$(CONFIG_CAN_KVASER_USB) += kvaser_usb.o
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obj-$(CONFIG_CAN_PEAK_USB) += peak_usb/
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obj-$(CONFIG_CAN_8DEV_USB) += usb_8dev.o
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971
drivers/net/can/usb/gs_usb.c
Normal file
971
drivers/net/can/usb/gs_usb.c
Normal file
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@ -0,0 +1,971 @@
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/* CAN driver for Geschwister Schneider USB/CAN devices.
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*
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* Copyright (C) 2013 Geschwister Schneider Technologie-,
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* Entwicklungs- und Vertriebs UG (Haftungsbeschränkt).
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*
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* Many thanks to all socketcan devs!
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published
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* by the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <linux/init.h>
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#include <linux/signal.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/usb.h>
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#include <linux/can.h>
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#include <linux/can/dev.h>
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#include <linux/can/error.h>
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/* Device specific constants */
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#define USB_GSUSB_1_VENDOR_ID 0x1d50
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#define USB_GSUSB_1_PRODUCT_ID 0x606f
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#define GSUSB_ENDPOINT_IN 1
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#define GSUSB_ENDPOINT_OUT 2
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/* Device specific constants */
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enum gs_usb_breq {
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GS_USB_BREQ_HOST_FORMAT = 0,
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GS_USB_BREQ_BITTIMING,
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GS_USB_BREQ_MODE,
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GS_USB_BREQ_BERR,
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GS_USB_BREQ_BT_CONST,
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GS_USB_BREQ_DEVICE_CONFIG
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};
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enum gs_can_mode {
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/* reset a channel. turns it off */
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GS_CAN_MODE_RESET = 0,
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/* starts a channel */
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GS_CAN_MODE_START
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};
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enum gs_can_state {
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GS_CAN_STATE_ERROR_ACTIVE = 0,
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GS_CAN_STATE_ERROR_WARNING,
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GS_CAN_STATE_ERROR_PASSIVE,
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GS_CAN_STATE_BUS_OFF,
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GS_CAN_STATE_STOPPED,
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GS_CAN_STATE_SLEEPING
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};
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/* data types passed between host and device */
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struct gs_host_config {
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u32 byte_order;
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} __packed;
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/* All data exchanged between host and device is exchanged in host byte order,
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* thanks to the struct gs_host_config byte_order member, which is sent first
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* to indicate the desired byte order.
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*/
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struct gs_device_config {
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u8 reserved1;
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u8 reserved2;
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u8 reserved3;
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u8 icount;
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u32 sw_version;
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u32 hw_version;
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} __packed;
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#define GS_CAN_MODE_NORMAL 0
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#define GS_CAN_MODE_LISTEN_ONLY (1<<0)
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#define GS_CAN_MODE_LOOP_BACK (1<<1)
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#define GS_CAN_MODE_TRIPLE_SAMPLE (1<<2)
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#define GS_CAN_MODE_ONE_SHOT (1<<3)
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struct gs_device_mode {
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u32 mode;
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u32 flags;
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} __packed;
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struct gs_device_state {
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u32 state;
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u32 rxerr;
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u32 txerr;
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} __packed;
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struct gs_device_bittiming {
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u32 prop_seg;
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u32 phase_seg1;
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u32 phase_seg2;
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u32 sjw;
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u32 brp;
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} __packed;
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#define GS_CAN_FEATURE_LISTEN_ONLY (1<<0)
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#define GS_CAN_FEATURE_LOOP_BACK (1<<1)
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#define GS_CAN_FEATURE_TRIPLE_SAMPLE (1<<2)
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#define GS_CAN_FEATURE_ONE_SHOT (1<<3)
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struct gs_device_bt_const {
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u32 feature;
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u32 fclk_can;
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u32 tseg1_min;
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u32 tseg1_max;
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u32 tseg2_min;
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u32 tseg2_max;
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u32 sjw_max;
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u32 brp_min;
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u32 brp_max;
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u32 brp_inc;
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} __packed;
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#define GS_CAN_FLAG_OVERFLOW 1
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struct gs_host_frame {
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u32 echo_id;
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u32 can_id;
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u8 can_dlc;
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u8 channel;
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u8 flags;
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u8 reserved;
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u8 data[8];
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} __packed;
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/* The GS USB devices make use of the same flags and masks as in
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* linux/can.h and linux/can/error.h, and no additional mapping is necessary.
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*/
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/* Only send a max of GS_MAX_TX_URBS frames per channel at a time. */
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#define GS_MAX_TX_URBS 10
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/* Only launch a max of GS_MAX_RX_URBS usb requests at a time. */
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#define GS_MAX_RX_URBS 30
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/* Maximum number of interfaces the driver supports per device.
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* Current hardware only supports 2 interfaces. The future may vary.
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*/
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#define GS_MAX_INTF 2
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struct gs_tx_context {
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struct gs_can *dev;
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unsigned int echo_id;
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};
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struct gs_can {
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struct can_priv can; /* must be the first member */
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struct gs_usb *parent;
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struct net_device *netdev;
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struct usb_device *udev;
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struct usb_interface *iface;
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struct can_bittiming_const bt_const;
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unsigned int channel; /* channel number */
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/* This lock prevents a race condition between xmit and recieve. */
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spinlock_t tx_ctx_lock;
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struct gs_tx_context tx_context[GS_MAX_TX_URBS];
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struct usb_anchor tx_submitted;
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atomic_t active_tx_urbs;
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};
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/* usb interface struct */
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struct gs_usb {
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struct gs_can *canch[GS_MAX_INTF];
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struct usb_anchor rx_submitted;
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atomic_t active_channels;
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struct usb_device *udev;
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};
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/* 'allocate' a tx context.
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* returns a valid tx context or NULL if there is no space.
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*/
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static struct gs_tx_context *gs_alloc_tx_context(struct gs_can *dev)
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{
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int i = 0;
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unsigned long flags;
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spin_lock_irqsave(&dev->tx_ctx_lock, flags);
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for (; i < GS_MAX_TX_URBS; i++) {
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if (dev->tx_context[i].echo_id == GS_MAX_TX_URBS) {
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dev->tx_context[i].echo_id = i;
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spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
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return &dev->tx_context[i];
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}
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}
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spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
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return NULL;
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}
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/* releases a tx context
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*/
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static void gs_free_tx_context(struct gs_tx_context *txc)
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{
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txc->echo_id = GS_MAX_TX_URBS;
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}
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/* Get a tx context by id.
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*/
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static struct gs_tx_context *gs_get_tx_context(struct gs_can *dev, unsigned int id)
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{
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unsigned long flags;
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if (id < GS_MAX_TX_URBS) {
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spin_lock_irqsave(&dev->tx_ctx_lock, flags);
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if (dev->tx_context[id].echo_id == id) {
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spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
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return &dev->tx_context[id];
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}
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spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
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}
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return NULL;
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}
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static int gs_cmd_reset(struct gs_usb *gsusb, struct gs_can *gsdev)
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{
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struct gs_device_mode *dm;
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struct usb_interface *intf = gsdev->iface;
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int rc;
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dm = kzalloc(sizeof(*dm), GFP_KERNEL);
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if (!dm)
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return -ENOMEM;
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dm->mode = GS_CAN_MODE_RESET;
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rc = usb_control_msg(interface_to_usbdev(intf),
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usb_sndctrlpipe(interface_to_usbdev(intf), 0),
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GS_USB_BREQ_MODE,
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USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
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gsdev->channel,
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0,
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dm,
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sizeof(*dm),
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1000);
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return rc;
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}
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static void gs_update_state(struct gs_can *dev, struct can_frame *cf)
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{
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struct can_device_stats *can_stats = &dev->can.can_stats;
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if (cf->can_id & CAN_ERR_RESTARTED) {
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dev->can.state = CAN_STATE_ERROR_ACTIVE;
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can_stats->restarts++;
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} else if (cf->can_id & CAN_ERR_BUSOFF) {
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dev->can.state = CAN_STATE_BUS_OFF;
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can_stats->bus_off++;
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} else if (cf->can_id & CAN_ERR_CRTL) {
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if ((cf->data[1] & CAN_ERR_CRTL_TX_WARNING) ||
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(cf->data[1] & CAN_ERR_CRTL_RX_WARNING)) {
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dev->can.state = CAN_STATE_ERROR_WARNING;
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can_stats->error_warning++;
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} else if ((cf->data[1] & CAN_ERR_CRTL_TX_PASSIVE) ||
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(cf->data[1] & CAN_ERR_CRTL_RX_PASSIVE)) {
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dev->can.state = CAN_STATE_ERROR_PASSIVE;
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can_stats->error_passive++;
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} else {
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dev->can.state = CAN_STATE_ERROR_ACTIVE;
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}
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}
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}
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static void gs_usb_recieve_bulk_callback(struct urb *urb)
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{
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struct gs_usb *usbcan = urb->context;
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struct gs_can *dev;
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struct net_device *netdev;
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int rc;
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struct net_device_stats *stats;
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struct gs_host_frame *hf = urb->transfer_buffer;
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struct gs_tx_context *txc;
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struct can_frame *cf;
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struct sk_buff *skb;
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BUG_ON(!usbcan);
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switch (urb->status) {
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case 0: /* success */
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break;
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case -ENOENT:
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case -ESHUTDOWN:
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return;
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default:
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/* do not resubmit aborted urbs. eg: when device goes down */
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return;
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}
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/* device reports out of range channel id */
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if (hf->channel >= GS_MAX_INTF)
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goto resubmit_urb;
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dev = usbcan->canch[hf->channel];
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netdev = dev->netdev;
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stats = &netdev->stats;
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if (!netif_device_present(netdev))
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return;
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if (hf->echo_id == -1) { /* normal rx */
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skb = alloc_can_skb(dev->netdev, &cf);
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if (!skb)
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return;
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cf->can_id = hf->can_id;
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cf->can_dlc = get_can_dlc(hf->can_dlc);
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memcpy(cf->data, hf->data, 8);
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/* ERROR frames tell us information about the controller */
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if (hf->can_id & CAN_ERR_FLAG)
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gs_update_state(dev, cf);
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netdev->stats.rx_packets++;
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netdev->stats.rx_bytes += hf->can_dlc;
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netif_rx(skb);
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} else { /* echo_id == hf->echo_id */
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if (hf->echo_id >= GS_MAX_TX_URBS) {
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netdev_err(netdev,
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"Unexpected out of range echo id %d\n",
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hf->echo_id);
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goto resubmit_urb;
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}
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netdev->stats.tx_packets++;
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netdev->stats.tx_bytes += hf->can_dlc;
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txc = gs_get_tx_context(dev, hf->echo_id);
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/* bad devices send bad echo_ids. */
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if (!txc) {
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netdev_err(netdev,
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"Unexpected unused echo id %d\n",
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hf->echo_id);
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goto resubmit_urb;
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}
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can_get_echo_skb(netdev, hf->echo_id);
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gs_free_tx_context(txc);
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netif_wake_queue(netdev);
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}
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if (hf->flags & GS_CAN_FLAG_OVERFLOW) {
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skb = alloc_can_err_skb(netdev, &cf);
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if (!skb)
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goto resubmit_urb;
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cf->can_id |= CAN_ERR_CRTL;
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cf->can_dlc = CAN_ERR_DLC;
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cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
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stats->rx_over_errors++;
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stats->rx_errors++;
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netif_rx(skb);
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}
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resubmit_urb:
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usb_fill_bulk_urb(urb,
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usbcan->udev,
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usb_rcvbulkpipe(usbcan->udev, GSUSB_ENDPOINT_IN),
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hf,
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sizeof(struct gs_host_frame),
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gs_usb_recieve_bulk_callback,
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usbcan
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);
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rc = usb_submit_urb(urb, GFP_ATOMIC);
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/* USB failure take down all interfaces */
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if (rc == -ENODEV) {
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for (rc = 0; rc < GS_MAX_INTF; rc++) {
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if (usbcan->canch[rc])
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netif_device_detach(usbcan->canch[rc]->netdev);
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}
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}
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}
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static int gs_usb_set_bittiming(struct net_device *netdev)
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{
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struct gs_can *dev = netdev_priv(netdev);
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struct can_bittiming *bt = &dev->can.bittiming;
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struct usb_interface *intf = dev->iface;
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int rc;
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struct gs_device_bittiming *dbt;
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dbt = kmalloc(sizeof(*dbt), GFP_KERNEL);
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if (!dbt)
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return -ENOMEM;
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dbt->prop_seg = bt->prop_seg;
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dbt->phase_seg1 = bt->phase_seg1;
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dbt->phase_seg2 = bt->phase_seg2;
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dbt->sjw = bt->sjw;
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dbt->brp = bt->brp;
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/* request bit timings */
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rc = usb_control_msg(interface_to_usbdev(intf),
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usb_sndctrlpipe(interface_to_usbdev(intf), 0),
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GS_USB_BREQ_BITTIMING,
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USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
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dev->channel,
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0,
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dbt,
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sizeof(*dbt),
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1000);
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kfree(dbt);
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if (rc < 0)
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dev_err(netdev->dev.parent, "Couldn't set bittimings (err=%d)",
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rc);
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return rc;
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}
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static void gs_usb_xmit_callback(struct urb *urb)
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{
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struct gs_tx_context *txc = urb->context;
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struct gs_can *dev = txc->dev;
|
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struct net_device *netdev = dev->netdev;
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|
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if (urb->status)
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netdev_info(netdev, "usb xmit fail %d\n", txc->echo_id);
|
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usb_free_coherent(urb->dev,
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urb->transfer_buffer_length,
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urb->transfer_buffer,
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urb->transfer_dma);
|
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atomic_dec(&dev->active_tx_urbs);
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|
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if (!netif_device_present(netdev))
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return;
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|
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if (netif_queue_stopped(netdev))
|
||||
netif_wake_queue(netdev);
|
||||
}
|
||||
|
||||
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) {
|
||||
netdev_err(netdev, "No memory left for URB\n");
|
||||
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 = cf->can_id;
|
||||
hf->can_dlc = cf->can_dlc;
|
||||
memcpy(hf->data, cf->data, cf->can_dlc);
|
||||
|
||||
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);
|
||||
|
||||
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);
|
||||
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;
|
||||
|
||||
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) {
|
||||
netdev_err(netdev,
|
||||
"No memory left for URB\n");
|
||||
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_recieve_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);
|
||||
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;
|
||||
dm->flags = 0;
|
||||
|
||||
if (ctrlmode & CAN_CTRLMODE_LOOPBACK)
|
||||
dm->flags |= GS_CAN_MODE_LOOP_BACK;
|
||||
else if (ctrlmode & CAN_CTRLMODE_LISTENONLY)
|
||||
dm->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)
|
||||
dm->flags |= GS_CAN_MODE_ONE_SHOT;
|
||||
|
||||
if (ctrlmode & CAN_CTRLMODE_3_SAMPLES)
|
||||
dm->flags |= GS_CAN_MODE_TRIPLE_SAMPLE;
|
||||
|
||||
/* finally start device */
|
||||
dm->mode = GS_CAN_MODE_START;
|
||||
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(parent, 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,
|
||||
};
|
||||
|
||||
static struct gs_can *gs_make_candev(unsigned int channel, struct usb_interface *intf)
|
||||
{
|
||||
struct gs_can *dev;
|
||||
struct net_device *netdev;
|
||||
int rc;
|
||||
struct gs_device_bt_const *bt_const;
|
||||
|
||||
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 settup */
|
||||
strcpy(dev->bt_const.name, "gs_usb");
|
||||
dev->bt_const.tseg1_min = bt_const->tseg1_min;
|
||||
dev->bt_const.tseg1_max = bt_const->tseg1_max;
|
||||
dev->bt_const.tseg2_min = bt_const->tseg2_min;
|
||||
dev->bt_const.tseg2_max = bt_const->tseg2_max;
|
||||
dev->bt_const.sjw_max = bt_const->sjw_max;
|
||||
dev->bt_const.brp_min = bt_const->brp_min;
|
||||
dev->bt_const.brp_max = bt_const->brp_max;
|
||||
dev->bt_const.brp_inc = 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 settup */
|
||||
dev->can.state = CAN_STATE_STOPPED;
|
||||
dev->can.clock.freq = bt_const->fclk_can;
|
||||
dev->can.bittiming_const = &dev->bt_const;
|
||||
dev->can.do_set_bittiming = gs_usb_set_bittiming;
|
||||
|
||||
dev->can.ctrlmode_supported = 0;
|
||||
|
||||
if (bt_const->feature & GS_CAN_FEATURE_LISTEN_ONLY)
|
||||
dev->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
|
||||
|
||||
if (bt_const->feature & GS_CAN_FEATURE_LOOP_BACK)
|
||||
dev->can.ctrlmode_supported |= CAN_CTRLMODE_LOOPBACK;
|
||||
|
||||
if (bt_const->feature & GS_CAN_FEATURE_TRIPLE_SAMPLE)
|
||||
dev->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
|
||||
|
||||
if (bt_const->feature & GS_CAN_FEATURE_ONE_SHOT)
|
||||
dev->can.ctrlmode_supported |= CAN_CTRLMODE_ONE_SHOT;
|
||||
|
||||
kfree(bt_const);
|
||||
|
||||
SET_NETDEV_DEV(netdev, &intf->dev);
|
||||
|
||||
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);
|
||||
free_candev(dev->netdev);
|
||||
kfree(dev);
|
||||
usb_kill_anchored_urbs(&dev->tx_submitted);
|
||||
}
|
||||
|
||||
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 = 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->altsetting[0].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->altsetting[0].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;
|
||||
|
||||
kfree(dconf);
|
||||
|
||||
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);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
|
||||
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);
|
||||
if (IS_ERR_OR_NULL(dev->canch[i])) {
|
||||
/* on failure destroy previously created candevs */
|
||||
icount = i;
|
||||
for (i = 0; i < icount; i++) {
|
||||
gs_destroy_candev(dev->canch[i]);
|
||||
dev->canch[i] = NULL;
|
||||
}
|
||||
kfree(dev);
|
||||
return rc;
|
||||
}
|
||||
dev->canch[i]->parent = dev;
|
||||
}
|
||||
|
||||
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++) {
|
||||
struct gs_can *can = dev->canch[i];
|
||||
|
||||
if (!can)
|
||||
continue;
|
||||
|
||||
gs_destroy_candev(can);
|
||||
}
|
||||
|
||||
usb_kill_anchored_urbs(&dev->rx_submitted);
|
||||
}
|
||||
|
||||
static const struct usb_device_id gs_usb_table[] = {
|
||||
{USB_DEVICE(USB_GSUSB_1_VENDOR_ID, USB_GSUSB_1_PRODUCT_ID)},
|
||||
{} /* 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 <mws@schneidersoft.net>");
|
||||
MODULE_DESCRIPTION(
|
||||
"Socket CAN device driver for Geschwister Schneider Technologie-, "
|
||||
"Entwicklungs- und Vertriebs UG. USB2.0 to CAN interfaces.");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in a new issue