diff options
Diffstat (limited to 'drivers/net/can/usb/peak_usb/pcan_usb_core.c')
| -rw-r--r-- | drivers/net/can/usb/peak_usb/pcan_usb_core.c | 122 |
1 files changed, 113 insertions, 9 deletions
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_core.c b/drivers/net/can/usb/peak_usb/pcan_usb_core.c index 1d996d3320fe..d881e1d30183 100644 --- a/drivers/net/can/usb/peak_usb/pcan_usb_core.c +++ b/drivers/net/can/usb/peak_usb/pcan_usb_core.c @@ -8,13 +8,15 @@ * * Many thanks to Klaus Hitschler <klaus.hitschler@gmx.de> */ +#include <linux/device.h> +#include <linux/ethtool.h> #include <linux/init.h> -#include <linux/signal.h> -#include <linux/slab.h> #include <linux/module.h> #include <linux/netdevice.h> +#include <linux/signal.h> +#include <linux/slab.h> +#include <linux/sysfs.h> #include <linux/usb.h> -#include <linux/ethtool.h> #include <linux/can.h> #include <linux/can/dev.h> @@ -53,6 +55,26 @@ static const struct usb_device_id peak_usb_table[] = { MODULE_DEVICE_TABLE(usb, peak_usb_table); +static ssize_t can_channel_id_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct net_device *netdev = to_net_dev(dev); + struct peak_usb_device *peak_dev = netdev_priv(netdev); + + return sysfs_emit(buf, "%08X\n", peak_dev->can_channel_id); +} +static DEVICE_ATTR_RO(can_channel_id); + +/* mutable to avoid cast in attribute_group */ +static struct attribute *peak_usb_sysfs_attrs[] = { + &dev_attr_can_channel_id.attr, + NULL, +}; + +static const struct attribute_group peak_usb_sysfs_group = { + .name = "peak_usb", + .attrs = peak_usb_sysfs_attrs, +}; + /* * dump memory */ @@ -808,6 +830,86 @@ static const struct net_device_ops peak_usb_netdev_ops = { .ndo_change_mtu = can_change_mtu, }; +/* CAN-USB devices generally handle 32-bit CAN channel IDs. + * In case one doesn't, then it have to overload this function. + */ +int peak_usb_get_eeprom_len(struct net_device *netdev) +{ + return sizeof(u32); +} + +/* Every CAN-USB device exports the dev_get_can_channel_id() operation. It is used + * here to fill the data buffer with the user defined CAN channel ID. + */ +int peak_usb_get_eeprom(struct net_device *netdev, + struct ethtool_eeprom *eeprom, u8 *data) +{ + struct peak_usb_device *dev = netdev_priv(netdev); + u32 ch_id; + __le32 ch_id_le; + int err; + + err = dev->adapter->dev_get_can_channel_id(dev, &ch_id); + if (err) + return err; + + /* ethtool operates on individual bytes. The byte order of the CAN + * channel id in memory depends on the kernel architecture. We + * convert the CAN channel id back to the native byte order of the PEAK + * device itself to ensure that the order is consistent for all + * host architectures. + */ + ch_id_le = cpu_to_le32(ch_id); + memcpy(data, (u8 *)&ch_id_le + eeprom->offset, eeprom->len); + + /* update cached value */ + dev->can_channel_id = ch_id; + return err; +} + +/* Every CAN-USB device exports the dev_get_can_channel_id()/dev_set_can_channel_id() + * operations. They are used here to set the new user defined CAN channel ID. + */ +int peak_usb_set_eeprom(struct net_device *netdev, + struct ethtool_eeprom *eeprom, u8 *data) +{ + struct peak_usb_device *dev = netdev_priv(netdev); + u32 ch_id; + __le32 ch_id_le; + int err; + + /* first, read the current user defined CAN channel ID */ + err = dev->adapter->dev_get_can_channel_id(dev, &ch_id); + if (err) { + netdev_err(netdev, "Failed to init CAN channel id (err %d)\n", err); + return err; + } + + /* do update the value with user given bytes. + * ethtool operates on individual bytes. The byte order of the CAN + * channel ID in memory depends on the kernel architecture. We + * convert the CAN channel ID back to the native byte order of the PEAK + * device itself to ensure that the order is consistent for all + * host architectures. + */ + ch_id_le = cpu_to_le32(ch_id); + memcpy((u8 *)&ch_id_le + eeprom->offset, data, eeprom->len); + ch_id = le32_to_cpu(ch_id_le); + + /* flash the new value now */ + err = dev->adapter->dev_set_can_channel_id(dev, ch_id); + if (err) { + netdev_err(netdev, "Failed to write new CAN channel id (err %d)\n", + err); + return err; + } + + /* update cached value with the new one */ + dev->can_channel_id = ch_id; + + return 0; +} + int pcan_get_ts_info(struct net_device *dev, struct ethtool_ts_info *info) { info->so_timestamping = @@ -881,6 +983,9 @@ static int peak_usb_create_dev(const struct peak_usb_adapter *peak_usb_adapter, /* add ethtool support */ netdev->ethtool_ops = peak_usb_adapter->ethtool_ops; + /* register peak_usb sysfs files */ + netdev->sysfs_groups[0] = &peak_usb_sysfs_group; + init_usb_anchor(&dev->rx_submitted); init_usb_anchor(&dev->tx_submitted); @@ -921,12 +1026,11 @@ static int peak_usb_create_dev(const struct peak_usb_adapter *peak_usb_adapter, goto adap_dev_free; } - /* get device number early */ - if (dev->adapter->dev_get_device_id) - dev->adapter->dev_get_device_id(dev, &dev->device_number); + /* get CAN channel id early */ + dev->adapter->dev_get_can_channel_id(dev, &dev->can_channel_id); - netdev_info(netdev, "attached to %s channel %u (device %u)\n", - peak_usb_adapter->name, ctrl_idx, dev->device_number); + netdev_info(netdev, "attached to %s channel %u (device 0x%08X)\n", + peak_usb_adapter->name, ctrl_idx, dev->can_channel_id); return 0; @@ -964,7 +1068,7 @@ static void peak_usb_disconnect(struct usb_interface *intf) dev->state &= ~PCAN_USB_STATE_CONNECTED; strscpy(name, netdev->name, IFNAMSIZ); - unregister_netdev(netdev); + unregister_candev(netdev); kfree(dev->cmd_buf); dev->next_siblings = NULL; |