aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/can/usb/gs_usb.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/net/can/usb/gs_usb.c')
-rw-r--r--drivers/net/can/usb/gs_usb.c143
1 files changed, 77 insertions, 66 deletions
diff --git a/drivers/net/can/usb/gs_usb.c b/drivers/net/can/usb/gs_usb.c
index 3005157059ca..0487095e1fd0 100644
--- a/drivers/net/can/usb/gs_usb.c
+++ b/drivers/net/can/usb/gs_usb.c
@@ -9,6 +9,7 @@
* Many thanks to all socketcan devs!
*/
+#include <linux/ethtool.h>
#include <linux/init.h>
#include <linux/signal.h>
#include <linux/module.h>
@@ -63,21 +64,27 @@ enum gs_can_identify_mode {
};
/* 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 {
- u32 byte_order;
+ __le32 byte_order;
} __packed;
-/* All data exchanged between host and device is exchanged in host byte order,
- * thanks to the struct gs_host_config byte_order member, which is sent first
- * to indicate the desired byte order.
- */
struct gs_device_config {
u8 reserved1;
u8 reserved2;
u8 reserved3;
u8 icount;
- u32 sw_version;
- u32 hw_version;
+ __le32 sw_version;
+ __le32 hw_version;
} __packed;
#define GS_CAN_MODE_NORMAL 0
@@ -87,26 +94,26 @@ struct gs_device_config {
#define GS_CAN_MODE_ONE_SHOT BIT(3)
struct gs_device_mode {
- u32 mode;
- u32 flags;
+ __le32 mode;
+ __le32 flags;
} __packed;
struct gs_device_state {
- u32 state;
- u32 rxerr;
- u32 txerr;
+ __le32 state;
+ __le32 rxerr;
+ __le32 txerr;
} __packed;
struct gs_device_bittiming {
- u32 prop_seg;
- u32 phase_seg1;
- u32 phase_seg2;
- u32 sjw;
- u32 brp;
+ __le32 prop_seg;
+ __le32 phase_seg1;
+ __le32 phase_seg2;
+ __le32 sjw;
+ __le32 brp;
} __packed;
struct gs_identify_mode {
- u32 mode;
+ __le32 mode;
} __packed;
#define GS_CAN_FEATURE_LISTEN_ONLY BIT(0)
@@ -117,23 +124,23 @@ struct gs_identify_mode {
#define GS_CAN_FEATURE_IDENTIFY BIT(5)
struct gs_device_bt_const {
- u32 feature;
- u32 fclk_can;
- u32 tseg1_min;
- u32 tseg1_max;
- u32 tseg2_min;
- u32 tseg2_max;
- u32 sjw_max;
- u32 brp_min;
- u32 brp_max;
- u32 brp_inc;
+ __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;
- u32 can_id;
+ __le32 can_id;
u8 can_dlc;
u8 channel;
@@ -329,13 +336,13 @@ static void gs_usb_receive_bulk_callback(struct urb *urb)
if (!skb)
return;
- cf->can_id = hf->can_id;
+ cf->can_id = le32_to_cpu(hf->can_id);
- cf->can_dlc = get_can_dlc(hf->can_dlc);
+ 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 (hf->can_id & CAN_ERR_FLAG)
+ if (le32_to_cpu(hf->can_id) & CAN_ERR_FLAG)
gs_update_state(dev, cf);
netdev->stats.rx_packets++;
@@ -378,7 +385,7 @@ static void gs_usb_receive_bulk_callback(struct urb *urb)
goto resubmit_urb;
cf->can_id |= CAN_ERR_CRTL;
- cf->can_dlc = CAN_ERR_DLC;
+ cf->len = CAN_ERR_DLC;
cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
stats->rx_over_errors++;
stats->rx_errors++;
@@ -418,11 +425,11 @@ static int gs_usb_set_bittiming(struct net_device *netdev)
if (!dbt)
return -ENOMEM;
- dbt->prop_seg = bt->prop_seg;
- dbt->phase_seg1 = bt->phase_seg1;
- dbt->phase_seg2 = bt->phase_seg2;
- dbt->sjw = bt->sjw;
- dbt->brp = bt->brp;
+ 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),
@@ -503,9 +510,10 @@ static netdev_tx_t gs_can_start_xmit(struct sk_buff *skb,
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);
+ 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),
@@ -573,6 +581,7 @@ static int gs_can_open(struct net_device *netdev)
int rc, i;
struct gs_device_mode *dm;
u32 ctrlmode;
+ u32 flags = 0;
rc = open_candev(netdev);
if (rc)
@@ -640,24 +649,24 @@ static int gs_can_open(struct net_device *netdev)
/* flags */
ctrlmode = dev->can.ctrlmode;
- dm->flags = 0;
if (ctrlmode & CAN_CTRLMODE_LOOPBACK)
- dm->flags |= GS_CAN_MODE_LOOP_BACK;
+ flags |= GS_CAN_MODE_LOOP_BACK;
else if (ctrlmode & CAN_CTRLMODE_LISTENONLY)
- dm->flags |= GS_CAN_MODE_LISTEN_ONLY;
+ 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;
+ flags |= GS_CAN_MODE_ONE_SHOT;
if (ctrlmode & CAN_CTRLMODE_3_SAMPLES)
- dm->flags |= GS_CAN_MODE_TRIPLE_SAMPLE;
+ flags |= GS_CAN_MODE_TRIPLE_SAMPLE;
/* finally start device */
- dm->mode = GS_CAN_MODE_START;
+ 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,
@@ -737,9 +746,9 @@ static int gs_usb_set_identify(struct net_device *netdev, bool do_identify)
return -ENOMEM;
if (do_identify)
- imode->mode = GS_CAN_IDENTIFY_ON;
+ imode->mode = cpu_to_le32(GS_CAN_IDENTIFY_ON);
else
- imode->mode = GS_CAN_IDENTIFY_OFF;
+ 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),
@@ -790,6 +799,7 @@ static struct gs_can *gs_make_candev(unsigned int channel,
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)
@@ -830,14 +840,14 @@ static struct gs_can *gs_make_candev(unsigned int channel,
/* dev setup */
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->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;
@@ -854,28 +864,29 @@ static struct gs_can *gs_make_candev(unsigned int channel,
/* can setup */
dev->can.state = CAN_STATE_STOPPED;
- dev->can.clock.freq = bt_const->fclk_can;
+ 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 = 0;
+ dev->can.ctrlmode_supported = CAN_CTRLMODE_CC_LEN8_DLC;
- if (bt_const->feature & GS_CAN_FEATURE_LISTEN_ONLY)
+ feature = le32_to_cpu(bt_const->feature);
+ if (feature & GS_CAN_FEATURE_LISTEN_ONLY)
dev->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
- if (bt_const->feature & GS_CAN_FEATURE_LOOP_BACK)
+ if (feature & GS_CAN_FEATURE_LOOP_BACK)
dev->can.ctrlmode_supported |= CAN_CTRLMODE_LOOPBACK;
- if (bt_const->feature & GS_CAN_FEATURE_TRIPLE_SAMPLE)
+ if (feature & GS_CAN_FEATURE_TRIPLE_SAMPLE)
dev->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
- if (bt_const->feature & GS_CAN_FEATURE_ONE_SHOT)
+ if (feature & GS_CAN_FEATURE_ONE_SHOT)
dev->can.ctrlmode_supported |= CAN_CTRLMODE_ONE_SHOT;
SET_NETDEV_DEV(netdev, &intf->dev);
- if (dconf->sw_version > 1)
- if (bt_const->feature & GS_CAN_FEATURE_IDENTIFY)
+ if (le32_to_cpu(dconf->sw_version) > 1)
+ if (feature & GS_CAN_FEATURE_IDENTIFY)
netdev->ethtool_ops = &gs_usb_ethtool_ops;
kfree(bt_const);
@@ -910,7 +921,7 @@ static int gs_usb_probe(struct usb_interface *intf,
if (!hconf)
return -ENOMEM;
- hconf->byte_order = 0x0000beef;
+ hconf->byte_order = cpu_to_le32(0x0000beef);
/* send host config */
rc = usb_control_msg(interface_to_usbdev(intf),
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.