3  * CAN driver for EMS Dr. Thomas Wuensche CPC-USB/ARM7
14 #include <linux/can.h>
15 #include <linux/can/dev.h>
16 #include <linux/can/error.h>
19 MODULE_DESCRIPTION("CAN driver for EMS Dr. Thomas Wuensche CAN/USB interfaces");
33 #define CPC_MSG_TYPE_CAN_FRAME       1  /* CAN data frame */
34 #define CPC_MSG_TYPE_RTR_FRAME       8  /* CAN remote frame */
35 #define CPC_MSG_TYPE_CAN_PARAMS      12 /* Actual CAN parameters */
36 #define CPC_MSG_TYPE_CAN_STATE       14 /* CAN state message */
37 #define CPC_MSG_TYPE_EXT_CAN_FRAME   16 /* Extended CAN data frame */
46 #define CPC_CMD_TYPE_CAN_FRAME     1   /* CAN data frame */
48 #define CPC_CMD_TYPE_CAN_PARAMS    6   /* set CAN parameters */
49 #define CPC_CMD_TYPE_RTR_FRAME     13  /* CAN remote frame */
50 #define CPC_CMD_TYPE_CAN_STATE     14  /* CAN state message */
51 #define CPC_CMD_TYPE_EXT_CAN_FRAME 15  /* Extended CAN data frame */
52 #define CPC_CMD_TYPE_EXT_RTR_FRAME 16  /* Extended CAN remote frame */
53 #define CPC_CMD_TYPE_CAN_EXIT      200 /* exit the CAN */
55 #define CPC_CMD_TYPE_INQ_ERR_COUNTER 25 /* request the CAN error counters */
59 #define CPC_CC_TYPE_SJA1000 2 /* Philips basic CAN controller */
69  * If the CAN controller lost a message we indicate it with the highest bit
83 /* Mode register NXP LPC2119/SJA1000 CAN Controller */
87 /* ECC register NXP LPC2119/SJA1000 CAN Controller */
103  * The device actually uses a 16MHz clock to generate the CAN clock
113  * CAN-Message representation in a CPC_MSG. Message object type is
123 /* Representation of the CAN parameters for the SJA1000 controller */
139 /* CAN params message representation */
143 	/* Will support M16C CAN controller in the future */
160 /* SJA1000 CAN errors (compatible to NXP LPC2119) */
167 /* structure for CAN error conditions */
183  * the values of the CAN controllers TX and RX error counter.
237 	struct can_priv can; /* must be the first member */  member
343 			dev->can.state = CAN_STATE_BUS_OFF;  in ems_usb_rx_err()
347 			dev->can.can_stats.bus_off++;  in ems_usb_rx_err()
350 			dev->can.state = CAN_STATE_ERROR_WARNING;  in ems_usb_rx_err()
351 			dev->can.can_stats.error_warning++;  in ems_usb_rx_err()
353 			dev->can.state = CAN_STATE_ERROR_ACTIVE;  in ems_usb_rx_err()
354 			dev->can.can_stats.error_passive++;  in ems_usb_rx_err()
362 		dev->can.can_stats.bus_error++;  in ems_usb_rx_err()
392 		if (skb && (dev->can.state == CAN_STATE_ERROR_WARNING ||  in ems_usb_rx_err()
393 			    dev->can.state == CAN_STATE_ERROR_PASSIVE)) {  in ems_usb_rx_err()
452 				/* Process CAN state changes */  in ems_usb_read_bulk_callback()
557  * Change CAN controllers' mode register
567  * Send a CPC_Control command to change behaviour when interface receives a CAN
568  * message, bus error or CAN state changed notifications.
669 	/* CPC-USB will transfer CAN state changes to host */  in ems_usb_start()
683 	dev->can.state = CAN_STATE_ERROR_ACTIVE;  in ems_usb_start()
875 	/* Set CAN controller to reset mode */  in ems_usb_close()
930 	struct can_bittiming *bt = &dev->can.bittiming;  in ems_usb_set_bittiming()
936 	if (dev->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)  in ems_usb_set_bittiming()
998 	dev->can.state = CAN_STATE_STOPPED;  in ems_usb_probe()
999 	dev->can.clock.freq = EMS_USB_ARM7_CLOCK;  in ems_usb_probe()
1000 	dev->can.bittiming_const = &ems_usb_bittiming_const;  in ems_usb_probe()
1001 	dev->can.do_set_bittiming = ems_usb_set_bittiming;  in ems_usb_probe()
1002 	dev->can.do_set_mode = ems_usb_set_mode;  in ems_usb_probe()
1003 	dev->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;  in ems_usb_probe()
1045 		netdev_err(netdev, "couldn't register CAN device: %d\n", err);  in ems_usb_probe()