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Diffstat (limited to 'include/linux/can/dev.h')
-rw-r--r--include/linux/can/dev.h196
1 files changed, 92 insertions, 104 deletions
diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h
index 5e3d45525bd3..982ba245eb41 100644
--- a/include/linux/can/dev.h
+++ b/include/linux/can/dev.h
@@ -15,10 +15,12 @@
#define _CAN_DEV_H
#include <linux/can.h>
+#include <linux/can/bittiming.h>
#include <linux/can/error.h>
-#include <linux/can/led.h>
+#include <linux/can/length.h>
#include <linux/can/netlink.h>
#include <linux/can/skb.h>
+#include <linux/ethtool.h>
#include <linux/netdevice.h>
/*
@@ -30,6 +32,12 @@ enum can_mode {
CAN_MODE_SLEEP
};
+enum can_termination_gpio {
+ CAN_TERMINATION_GPIO_DISABLED = 0,
+ CAN_TERMINATION_GPIO_ENABLED,
+ CAN_TERMINATION_GPIO_MAX,
+};
+
/*
* CAN common private data
*/
@@ -37,25 +45,33 @@ struct can_priv {
struct net_device *dev;
struct can_device_stats can_stats;
- struct can_bittiming bittiming, data_bittiming;
const struct can_bittiming_const *bittiming_const,
*data_bittiming_const;
- const u16 *termination_const;
- unsigned int termination_const_cnt;
- u16 termination;
- const u32 *bitrate_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 */
- u32 ctrlmode_static; /* static enabled options for driver/hardware */
int restart_ms;
struct delayed_work restart_work;
@@ -68,114 +84,91 @@ struct can_priv {
enum can_state *state);
int (*do_get_berr_counter)(const struct net_device *dev,
struct can_berr_counter *bec);
-
- unsigned int echo_skb_max;
- struct sk_buff **echo_skb;
-
-#ifdef CONFIG_CAN_LEDS
- struct led_trigger *tx_led_trig;
- char tx_led_trig_name[CAN_LED_NAME_SZ];
- struct led_trigger *rx_led_trig;
- char rx_led_trig_name[CAN_LED_NAME_SZ];
- struct led_trigger *rxtx_led_trig;
- char rxtx_led_trig_name[CAN_LED_NAME_SZ];
-#endif
+ 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);
+}
+
/*
- * get_can_dlc(value) - helper macro to cast a given data length code (dlc)
- * to __u8 and ensure the dlc value to be max. 8 bytes.
+ * can_get_relative_tdco() - TDCO relative to the sample point
*
- * To be used in the CAN netdriver receive path to ensure conformance with
- * ISO 11898-1 Chapter 8.4.2.3 (DLC field)
+ * 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 ------------>|
*/
-#define get_can_dlc(i) (min_t(__u8, (i), CAN_MAX_DLC))
-#define get_canfd_dlc(i) (min_t(__u8, (i), CANFD_MAX_DLC))
+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;
+}
-/* Check for outgoing skbs that have not been created by the CAN subsystem */
-static inline bool can_skb_headroom_valid(struct net_device *dev,
- struct sk_buff *skb)
+/* 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)
{
- /* af_packet creates a headroom of HH_DATA_MOD bytes which is fine */
- if (WARN_ON_ONCE(skb_headroom(skb) < sizeof(struct can_skb_priv)))
- return false;
-
- /* af_packet does not apply CAN skb specific settings */
- if (skb->ip_summed == CHECKSUM_NONE) {
- /* init headroom */
- can_skb_prv(skb)->ifindex = dev->ifindex;
- can_skb_prv(skb)->skbcnt = 0;
-
- skb->ip_summed = CHECKSUM_UNNECESSARY;
-
- /* preform proper loopback on capable devices */
- if (dev->flags & IFF_ECHO)
- skb->pkt_type = PACKET_LOOPBACK;
- else
- skb->pkt_type = PACKET_HOST;
-
- skb_reset_mac_header(skb);
- skb_reset_network_header(skb);
- skb_reset_transport_header(skb);
+ 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 true;
+ return 0;
}
-/* Drop a given socketbuffer if it does not contain a valid CAN frame. */
-static inline bool can_dropped_invalid_skb(struct net_device *dev,
- struct sk_buff *skb)
+static inline u32 can_get_static_ctrlmode(struct can_priv *priv)
{
- const struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
-
- if (skb->protocol == htons(ETH_P_CAN)) {
- if (unlikely(skb->len != CAN_MTU ||
- cfd->len > CAN_MAX_DLEN))
- goto inval_skb;
- } else if (skb->protocol == htons(ETH_P_CANFD)) {
- if (unlikely(skb->len != CANFD_MTU ||
- cfd->len > CANFD_MAX_DLEN))
- goto inval_skb;
- } else
- goto inval_skb;
-
- if (!can_skb_headroom_valid(dev, skb))
- goto inval_skb;
-
- return false;
-
-inval_skb:
- kfree_skb(skb);
- dev->stats.tx_dropped++;
- return true;
+ return priv->ctrlmode & ~priv->ctrlmode_supported;
}
-static inline bool can_is_canfd_skb(const struct sk_buff *skb)
+static inline bool can_is_canxl_dev_mtu(unsigned int mtu)
{
- /* the CAN specific type of skb is identified by its data length */
- return skb->len == CANFD_MTU;
+ return (mtu >= CANXL_MIN_MTU && mtu <= CANXL_MAX_MTU);
}
-/* helper to define static CAN controller features at device creation time */
-static inline void can_set_static_ctrlmode(struct net_device *dev,
- u32 static_mode)
+/* 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);
- /* alloc_candev() succeeded => netdev_priv() is valid at this point */
- priv->ctrlmode = static_mode;
- priv->ctrlmode_static = static_mode;
+ 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;
+ }
- /* override MTU which was set by default in can_setup()? */
- if (static_mode & CAN_CTRLMODE_FD)
- dev->mtu = CANFD_MTU;
+ return can_dropped_invalid_skb(dev, skb);
}
-/* get data length from can_dlc with sanitized can_dlc */
-u8 can_dlc2len(u8 can_dlc);
-
-/* map the sanitized data length to an appropriate data length code */
-u8 can_len2dlc(u8 len);
+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);
@@ -191,6 +184,9 @@ 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);
@@ -198,26 +194,18 @@ 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_change_state(struct net_device *dev, struct can_frame *cf,
enum can_state tx_state, enum can_state rx_state);
-void can_put_echo_skb(struct sk_buff *skb, struct net_device *dev,
- unsigned int idx);
-struct sk_buff *__can_get_echo_skb(struct net_device *dev, unsigned int idx,
- u8 *len_ptr);
-unsigned int can_get_echo_skb(struct net_device *dev, unsigned int idx);
-void can_free_echo_skb(struct net_device *dev, unsigned int idx);
-
#ifdef CONFIG_OF
void of_can_transceiver(struct net_device *dev);
#else
static inline void of_can_transceiver(struct net_device *dev) { }
#endif
-struct sk_buff *alloc_can_skb(struct net_device *dev, struct can_frame **cf);
-struct sk_buff *alloc_canfd_skb(struct net_device *dev,
- struct canfd_frame **cfd);
-struct sk_buff *alloc_can_err_skb(struct net_device *dev,
- struct can_frame **cf);
+extern struct rtnl_link_ops can_link_ops;
+int can_netlink_register(void);
+void can_netlink_unregister(void);
#endif /* !_CAN_DEV_H */
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.