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linux-headers-6.8.0-88
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include
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linux
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can
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dev.h
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/* SPDX-License-Identifier: GPL-2.0 */ /* * linux/can/dev.h * * Definitions for the CAN network device driver interface * * Copyright (C) 2006 Andrey Volkov <avolkov@varma-el.com> * Varma Electronics Oy * * Copyright (C) 2008 Wolfgang Grandegger <wg@grandegger.com> * */ #ifndef _CAN_DEV_H #define _CAN_DEV_H #include <linux/can.h> #include <linux/can/bittiming.h> #include <linux/can/error.h> #include <linux/can/length.h> #include <linux/can/netlink.h> #include <linux/can/skb.h> #include <linux/ethtool.h> #include <linux/netdevice.h> /* * CAN mode */ enum can_mode { CAN_MODE_STOP = 0, CAN_MODE_START, CAN_MODE_SLEEP }; enum can_termination_gpio { CAN_TERMINATION_GPIO_DISABLED = 0, CAN_TERMINATION_GPIO_ENABLED, CAN_TERMINATION_GPIO_MAX, }; /* * CAN common private data */ struct can_priv { struct net_device *dev; struct can_device_stats can_stats; const struct can_bittiming_const *bittiming_const, *data_bittiming_const; struct can_bittiming bittiming, data_bittiming; const struct can_tdc_const *tdc_const; struct can_tdc tdc; unsigned int bitrate_const_cnt; const u32 *bitrate_const; const u32 *data_bitrate_const; unsigned int data_bitrate_const_cnt; u32 bitrate_max; struct can_clock clock; unsigned int termination_const_cnt; const u16 *termination_const; u16 termination; struct gpio_desc *termination_gpio; u16 termination_gpio_ohms[CAN_TERMINATION_GPIO_MAX]; unsigned int echo_skb_max; struct sk_buff **echo_skb; enum can_state state; /* CAN controller features - see include/uapi/linux/can/netlink.h */ u32 ctrlmode; /* current options setting */ u32 ctrlmode_supported; /* options that can be modified by netlink */ int restart_ms; struct delayed_work restart_work; int (*do_set_bittiming)(struct net_device *dev); int (*do_set_data_bittiming)(struct net_device *dev); int (*do_set_mode)(struct net_device *dev, enum can_mode mode); int (*do_set_termination)(struct net_device *dev, u16 term); int (*do_get_state)(const struct net_device *dev, enum can_state *state); int (*do_get_berr_counter)(const struct net_device *dev, struct can_berr_counter *bec); int (*do_get_auto_tdcv)(const struct net_device *dev, u32 *tdcv); }; static inline bool can_tdc_is_enabled(const struct can_priv *priv) { return !!(priv->ctrlmode & CAN_CTRLMODE_TDC_MASK); } /* * can_get_relative_tdco() - TDCO relative to the sample point * * struct can_tdc::tdco represents the absolute offset from TDCV. Some * controllers use instead an offset relative to the Sample Point (SP) * such that: * * SSP = TDCV + absolute TDCO * = TDCV + SP + relative TDCO * * -+----------- one bit ----------+-- TX pin * |<--- Sample Point --->| * * --+----------- one bit ----------+-- RX pin * |<-------- TDCV -------->| * |<------------------------>| absolute TDCO * |<--- Sample Point --->| * | |<->| relative TDCO * |<------------- Secondary Sample Point ------------>| */ static inline s32 can_get_relative_tdco(const struct can_priv *priv) { const struct can_bittiming *dbt = &priv->data_bittiming; s32 sample_point_in_tc = (CAN_SYNC_SEG + dbt->prop_seg + dbt->phase_seg1) * dbt->brp; return (s32)priv->tdc.tdco - sample_point_in_tc; } /* helper to define static CAN controller features at device creation time */ static inline int __must_check can_set_static_ctrlmode(struct net_device *dev, u32 static_mode) { struct can_priv *priv = netdev_priv(dev); /* alloc_candev() succeeded => netdev_priv() is valid at this point */ if (priv->ctrlmode_supported & static_mode) { netdev_warn(dev, "Controller features can not be supported and static at the same time\n"); return -EINVAL; } priv->ctrlmode = static_mode; /* override MTU which was set by default in can_setup()? */ if (static_mode & CAN_CTRLMODE_FD) dev->mtu = CANFD_MTU; return 0; } static inline u32 can_get_static_ctrlmode(struct can_priv *priv) { return priv->ctrlmode & ~priv->ctrlmode_supported; } static inline bool can_is_canxl_dev_mtu(unsigned int mtu) { return (mtu >= CANXL_MIN_MTU && mtu <= CANXL_MAX_MTU); } /* drop skb if it does not contain a valid CAN frame for sending */ static inline bool can_dev_dropped_skb(struct net_device *dev, struct sk_buff *skb) { struct can_priv *priv = netdev_priv(dev); if (priv->ctrlmode & CAN_CTRLMODE_LISTENONLY) { netdev_info_once(dev, "interface in listen only mode, dropping skb\n"); kfree_skb(skb); dev->stats.tx_dropped++; return true; } return can_dropped_invalid_skb(dev, skb); } void can_setup(struct net_device *dev); struct net_device *alloc_candev_mqs(int sizeof_priv, unsigned int echo_skb_max, unsigned int txqs, unsigned int rxqs); #define alloc_candev(sizeof_priv, echo_skb_max) \ alloc_candev_mqs(sizeof_priv, echo_skb_max, 1, 1) #define alloc_candev_mq(sizeof_priv, echo_skb_max, count) \ alloc_candev_mqs(sizeof_priv, echo_skb_max, count, count) void free_candev(struct net_device *dev); /* a candev safe wrapper around netdev_priv */ struct can_priv *safe_candev_priv(struct net_device *dev); int open_candev(struct net_device *dev); void close_candev(struct net_device *dev); int can_change_mtu(struct net_device *dev, int new_mtu); int can_eth_ioctl_hwts(struct net_device *netdev, struct ifreq *ifr, int cmd); int can_ethtool_op_get_ts_info_hwts(struct net_device *dev, struct ethtool_ts_info *info); int register_candev(struct net_device *dev); void unregister_candev(struct net_device *dev); int can_restart_now(struct net_device *dev); void can_bus_off(struct net_device *dev); const char *can_get_state_str(const enum can_state state); void can_state_get_by_berr_counter(const struct net_device *dev, const struct can_berr_counter *bec, enum can_state *tx_state, enum can_state *rx_state); void can_change_state(struct net_device *dev, struct can_frame *cf, enum can_state tx_state, enum can_state rx_state); #ifdef CONFIG_OF void of_can_transceiver(struct net_device *dev); #else static inline void of_can_transceiver(struct net_device *dev) { } #endif extern struct rtnl_link_ops can_link_ops; int can_netlink_register(void); void can_netlink_unregister(void); #endif /* !_CAN_DEV_H */