This patch add support for Fintek USB to 2CAN controller support. Signed-off-by: Ji-Ze Hong (Peter Hong) <peter_hong@xxxxxxxxxxxxx> --- drivers/net/can/usb/Kconfig | 9 + drivers/net/can/usb/Makefile | 1 + drivers/net/can/usb/f81604.c | 1215 ++++++++++++++++++++++++++++++++++ 3 files changed, 1225 insertions(+) create mode 100644 drivers/net/can/usb/f81604.c diff --git a/drivers/net/can/usb/Kconfig b/drivers/net/can/usb/Kconfig index 445504ababce..381547939c39 100644 --- a/drivers/net/can/usb/Kconfig +++ b/drivers/net/can/usb/Kconfig @@ -147,4 +147,13 @@ config CAN_UCAN from Theobroma Systems like the A31-µQ7 and the RK3399-Q7 (https://www.theobroma-systems.com/rk3399-q7) +config CAN_F81604 + tristate "Fintek F81604 USB to 2CAN interface" + help + This driver supports the Fintek F81604 USB to 2CAN interface. + The device can support CAN2.0A/B protocol and also support + 2 output pins to control external terminator (optional). + + (see also https://www.fintek.com.tw). + endmenu diff --git a/drivers/net/can/usb/Makefile b/drivers/net/can/usb/Makefile index 1ea16be5743b..9de0305a5cce 100644 --- a/drivers/net/can/usb/Makefile +++ b/drivers/net/can/usb/Makefile @@ -12,3 +12,4 @@ obj-$(CONFIG_CAN_KVASER_USB) += kvaser_usb/ obj-$(CONFIG_CAN_MCBA_USB) += mcba_usb.o obj-$(CONFIG_CAN_PEAK_USB) += peak_usb/ obj-$(CONFIG_CAN_UCAN) += ucan.o +obj-$(CONFIG_CAN_F81604) += f81604.o diff --git a/drivers/net/can/usb/f81604.c b/drivers/net/can/usb/f81604.c new file mode 100644 index 000000000000..166f5789247e --- /dev/null +++ b/drivers/net/can/usb/f81604.c @@ -0,0 +1,1215 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Fintek F81604 USB-to-2CAN controller driver. + * + * Copyright (C) 2023 Ji-Ze Hong (Peter Hong) <peter_hong@xxxxxxxxxxxxx> + */ +#include <linux/netdevice.h> +#include <linux/usb.h> + +#include <linux/can.h> +#include <linux/can/dev.h> +#include <linux/can/error.h> +#include <linux/can/platform/sja1000.h> + +/* vendor and product id */ +#define F81604_VENDOR_ID 0x2c42 +#define F81604_PRODUCT_ID 0x1709 +#define F81604_MAX_DEV 2 + +#define F81604_USB_MAX_RETRY 10 +#define F81604_USB_TIMEOUT 2000 +#define F81604_SET_GET_REGISTER 0xA0 +#define F81604_PORT_OFFSET 0x1000 + +#define F81604_BULK_SIZE 64 +#define F81604_INT_SIZE 16 +#define F81604_DATA_SIZE 14 +#define F81604_MAX_RX_URBS 4 + +#define F81604_CMD_OFFSET 0x00 +#define F81604_CMD_DATA 0x00 + +#define F81604_DLC_OFFSET 0x01 +#define F81604_LEN_MASK 0x0f +#define F81604_EFF_BIT BIT(7) +#define F81604_RTR_BIT BIT(6) + +#define F81604_ID1_OFFSET 0x02 +#define F81604_ID2_OFFSET 0x03 +#define F81604_ID3_OFFSET 0x04 +#define F81604_ID4_OFFSET 0x05 + +#define F81604_SFF_DATA_OFFSET 0x04 +#define F81604_EFF_DATA_OFFSET 0x06 + +/* device setting */ +#define F81604_TX_ONESHOT (0x03 << 3) +#define F81604_TX_NORMAL (0x01 << 3) +#define F81604_RX_AUTO_RELEASE_BUF (0x01 << 1) +#define F81604_INT_WHEN_CHANGE (0x01 << 0) + +/* SJA1000 registers - manual section 6.4 (Pelican Mode) */ +#define SJA1000_MOD 0x00 +#define SJA1000_CMR 0x01 +#define SJA1000_IR 0x03 +#define SJA1000_IER 0x04 +#define SJA1000_ALC 0x0B +#define SJA1000_ECC 0x0C +#define SJA1000_RXERR 0x0E +#define SJA1000_TXERR 0x0F +#define SJA1000_ACCC0 0x10 +#define SJA1000_ACCC1 0x11 +#define SJA1000_ACCC2 0x12 +#define SJA1000_ACCC3 0x13 +#define SJA1000_ACCM0 0x14 +#define SJA1000_ACCM1 0x15 +#define SJA1000_ACCM2 0x16 +#define SJA1000_ACCM3 0x17 + +/* Common registers - manual section 6.5 */ +#define SJA1000_BTR0 0x06 +#define SJA1000_BTR1 0x07 +#define SJA1000_OCR 0x08 +#define SJA1000_CDR 0x1F + +#define SJA1000_FI 0x10 +#define SJA1000_SFF_BUF 0x13 +#define SJA1000_EFF_BUF 0x15 + +#define SJA1000_FI_FF 0x80 +#define SJA1000_FI_RTR 0x40 + +#define SJA1000_ID1 0x11 +#define SJA1000_ID2 0x12 +#define SJA1000_ID3 0x13 +#define SJA1000_ID4 0x14 + +/* mode register */ +#define MOD_RM 0x01 +#define MOD_LOM 0x02 +#define MOD_STM 0x04 + +/* commands */ +#define CMD_CDO 0x08 + +/* interrupt sources */ +#define IRQ_BEI 0x80 +#define IRQ_ALI 0x40 +#define IRQ_EPI 0x20 +#define IRQ_DOI 0x08 +#define IRQ_EI 0x04 +#define IRQ_TI 0x02 +#define IRQ_RI 0x01 +#define IRQ_ALL 0xFF +#define IRQ_OFF 0x00 + +/* status register content */ +#define SR_BS 0x80 +#define SR_ES 0x40 +#define SR_TS 0x20 +#define SR_RS 0x10 +#define SR_TCS 0x08 +#define SR_TBS 0x04 +#define SR_DOS 0x02 +#define SR_RBS 0x01 + +/* ECC register */ +#define ECC_SEG 0x1F +#define ECC_DIR 0x20 +#define ECC_BIT 0x00 +#define ECC_FORM 0x40 +#define ECC_STUFF 0x80 +#define ECC_MASK 0xc0 + +/* table of devices that work with this driver */ +static const struct usb_device_id f81604_table[] = { + { USB_DEVICE(F81604_VENDOR_ID, F81604_PRODUCT_ID) }, + {} /* Terminating entry */ +}; + +MODULE_DEVICE_TABLE(usb, f81604_table); + +struct f81604_priv { + struct net_device *netdev[F81604_MAX_DEV]; +}; + +struct f81604_port_priv { + struct can_priv can; + struct net_device *netdev; + struct sk_buff *echo_skb; + + /* For synchronize need_clear_alc/need_clear_ecc in worker & interrupt + * callback. + */ + spinlock_t lock; + bool need_clear_alc; + bool need_clear_ecc; + + struct work_struct handle_clear_reg_work; + struct work_struct handle_clear_overrun_work; + + struct usb_device *dev; + struct usb_interface *intf; + + struct urb *int_urb; + u8 int_read_buffer[F81604_INT_SIZE]; + + struct urb *read_urb[F81604_MAX_RX_URBS]; + u8 bulk_read_buffer[F81604_MAX_RX_URBS][F81604_BULK_SIZE]; + + struct urb *write_urb; + u8 bulk_write_buffer[F81604_DATA_SIZE]; + + u8 ocr; + u8 cdr; +}; + +static int f81604_set_register(struct usb_device *dev, u16 reg, u8 data) +{ + size_t count = F81604_USB_MAX_RETRY; + int status; + + while (count--) { + status = usb_control_msg_send(dev, 0, F81604_SET_GET_REGISTER, + USB_TYPE_VENDOR | USB_DIR_OUT, 0, + reg, &data, sizeof(u8), + F81604_USB_TIMEOUT, GFP_KERNEL); + if (!status) + break; + } + + if (status) { + dev_err(&dev->dev, "%s: reg: %x data: %x failed: %d\n", + __func__, reg, data, status); + } + + return status; +} + +static int f81604_get_register(struct usb_device *dev, u16 reg, u8 *data) +{ + size_t count = F81604_USB_MAX_RETRY; + int status; + + while (count--) { + status = usb_control_msg_recv(dev, 0, F81604_SET_GET_REGISTER, + USB_TYPE_VENDOR | USB_DIR_IN, 0, + reg, data, sizeof(u8), + F81604_USB_TIMEOUT, GFP_KERNEL); + if (!status) + break; + } + + if (status < 0) { + dev_err(&dev->dev, "%s: reg: %x failed: %d\n", __func__, reg, + status); + } + + return status; +} + +static int f81604_set_sja1000_register(struct usb_device *dev, u8 port, + u16 reg, u8 data) +{ + int real_reg; + + real_reg = reg + F81604_PORT_OFFSET * port + F81604_PORT_OFFSET; + return f81604_set_register(dev, real_reg, data); +} + +static int f81604_get_sja1000_register(struct usb_device *dev, u8 port, + u16 reg, u8 *data) +{ + int real_reg; + + real_reg = reg + F81604_PORT_OFFSET * port + F81604_PORT_OFFSET; + return f81604_get_register(dev, real_reg, data); +} + +static int f81604_set_reset_mode(struct net_device *netdev) +{ + struct f81604_port_priv *priv = netdev_priv(netdev); + int status, i; + u8 tmp; + + /* disable interrupts */ + status = f81604_set_sja1000_register(priv->dev, netdev->dev_id, + SJA1000_IER, IRQ_OFF); + if (status) + return status; + + for (i = 0; i < 100; i++) { + status = f81604_get_sja1000_register(priv->dev, netdev->dev_id, + SJA1000_MOD, &tmp); + if (status) + return status; + + /* check reset bit */ + if (tmp & MOD_RM) { + priv->can.state = CAN_STATE_STOPPED; + return 0; + } + + /* reset chip */ + status = f81604_set_sja1000_register(priv->dev, netdev->dev_id, + SJA1000_MOD, MOD_RM); + if (status) + return status; + } + + netdev_err(netdev, "setting SJA1000 into reset mode failed!\n"); + return -EINVAL; +} + +static int f81604_set_normal_mode(struct net_device *netdev) +{ + struct f81604_port_priv *priv = netdev_priv(netdev); + int status, i; + u8 mod_reg_val = 0x00; + u8 ier = 0; + u8 tmp; + + for (i = 0; i < 100; i++) { + status = f81604_get_sja1000_register(priv->dev, netdev->dev_id, + SJA1000_MOD, &tmp); + if (status) + return status; + + /* check reset bit */ + if ((tmp & MOD_RM) == 0) { + priv->can.state = CAN_STATE_ERROR_ACTIVE; + /* enable interrupts, RI handled by bulk-in */ + if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) + ier = IRQ_ALL & ~IRQ_RI; + else + ier = IRQ_ALL & ~(IRQ_RI | IRQ_BEI); + + status = f81604_set_sja1000_register(priv->dev, + netdev->dev_id, + SJA1000_IER, + ier); + + return status; + } + + /* set chip to normal mode */ + if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) + mod_reg_val |= MOD_LOM; + if (priv->can.ctrlmode & CAN_CTRLMODE_PRESUME_ACK) + mod_reg_val |= MOD_STM; + + status = f81604_set_sja1000_register(priv->dev, netdev->dev_id, + SJA1000_MOD, mod_reg_val); + if (status) + return status; + } + + netdev_err(netdev, "setting SJA1000 into normal mode failed!\n"); + return -EINVAL; +} + +static int f81604_chipset_init(struct net_device *netdev) +{ + struct f81604_port_priv *priv = netdev_priv(netdev); + int status; + int i; + + /* set clock divider and output control register */ + status = f81604_set_sja1000_register(priv->dev, netdev->dev_id, + SJA1000_CDR, + priv->cdr | CDR_PELICAN); + if (status) + return status; + + /* set acceptance filter (accept all) */ + for (i = 0; i < 4; ++i) { + status = f81604_set_sja1000_register(priv->dev, netdev->dev_id, + SJA1000_ACCC0 + i, 0); + if (status) + return status; + } + + for (i = 0; i < 4; ++i) { + status = f81604_set_sja1000_register(priv->dev, netdev->dev_id, + SJA1000_ACCM0 + i, 0xFF); + if (status) + return status; + } + + return f81604_set_sja1000_register(priv->dev, netdev->dev_id, + SJA1000_OCR, + priv->ocr | OCR_MODE_NORMAL); +} + +static void f81604_unregister_urbs(struct net_device *netdev) +{ + struct f81604_port_priv *priv = netdev_priv(netdev); + int i; + + usb_kill_urb(priv->write_urb); + + for (i = 0; i < F81604_MAX_RX_URBS; ++i) + usb_kill_urb(priv->read_urb[i]); + + usb_kill_urb(priv->int_urb); +} + +static int f81604_register_urbs(struct net_device *netdev) +{ + struct f81604_port_priv *priv = netdev_priv(netdev); + int status, i; + + for (i = 0; i < F81604_MAX_RX_URBS; ++i) { + status = usb_submit_urb(priv->read_urb[i], GFP_KERNEL); + if (status) { + netdev_warn(netdev, "%s: submit rx urb failed: %d\n", + __func__, status); + return status; + } + } + + status = usb_submit_urb(priv->int_urb, GFP_KERNEL); + if (status) { + netdev_warn(netdev, "%s: submit int urb failed: %d\n", + __func__, status); + return status; + } + + return 0; +} + +static int f81604_start(struct net_device *netdev) +{ + struct f81604_port_priv *priv = netdev_priv(netdev); + int status; + u8 mode; + u8 tmp; + + f81604_unregister_urbs(netdev); + + mode = F81604_RX_AUTO_RELEASE_BUF | F81604_INT_WHEN_CHANGE; + + /* Set TR/AT mode */ + if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT) + mode |= F81604_TX_ONESHOT; + else + mode |= F81604_TX_NORMAL; + + status = f81604_set_sja1000_register(priv->dev, netdev->dev_id, 0x80, + mode); + if (status) + return status; + + /* set reset mode */ + status = f81604_set_reset_mode(netdev); + if (status) + return status; + + status = f81604_chipset_init(netdev); + if (status) + return status; + + /* Clear error counters and error code capture */ + status = f81604_set_sja1000_register(priv->dev, netdev->dev_id, + SJA1000_TXERR, 0); + if (status) + return status; + + status = f81604_set_sja1000_register(priv->dev, netdev->dev_id, + SJA1000_RXERR, 0); + if (status) + return status; + + /* Read clear for ECC/ALC/IR register */ + status = f81604_get_sja1000_register(priv->dev, netdev->dev_id, + SJA1000_ECC, &tmp); + if (status) + return status; + + status = f81604_get_sja1000_register(priv->dev, netdev->dev_id, + SJA1000_ALC, &tmp); + if (status) + return status; + + status = f81604_get_sja1000_register(priv->dev, netdev->dev_id, + SJA1000_IR, &tmp); + if (status) + return status; + + status = f81604_register_urbs(netdev); + if (status) + return status; + + return f81604_set_normal_mode(netdev); +} + +static int f81604_set_bittiming(struct net_device *dev) +{ + struct f81604_port_priv *priv = netdev_priv(dev); + struct can_bittiming *bt; + int status = 0; + u8 btr0, btr1; + + bt = &priv->can.bittiming; + btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6); + btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) | + (((bt->phase_seg2 - 1) & 0x7) << 4); + + if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) + btr1 |= 0x80; + + netdev_info(dev, "BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1); + + status = f81604_set_sja1000_register(priv->dev, dev->dev_id, + SJA1000_BTR0, btr0); + if (status) { + netdev_warn(dev, "%s: Set BTR0 failed: %d\n", __func__, + status); + return status; + } + + status = f81604_set_sja1000_register(priv->dev, dev->dev_id, + SJA1000_BTR1, btr1); + if (status) { + netdev_warn(dev, "%s: Set BTR1 failed: %d\n", __func__, + status); + return status; + } + + return 0; +} + +static int f81604_set_mode(struct net_device *netdev, enum can_mode mode) +{ + int err; + + switch (mode) { + case CAN_MODE_START: + err = f81604_start(netdev); + if (!err && netif_queue_stopped(netdev)) + netif_wake_queue(netdev); + break; + + default: + err = -EOPNOTSUPP; + } + + return err; +} + +static void f81604_process_rx_packet(struct urb *urb) +{ + struct net_device_stats *stats; + struct net_device *netdev; + struct can_frame *cf; + struct sk_buff *skb; + u8 *data; + u8 *ptr; + int i; + int count; + + netdev = urb->context; + stats = &netdev->stats; + data = urb->transfer_buffer; + + if (urb->actual_length % 14) { + netdev_warn(netdev, "actual_length %% 14 != 0 (%d)\n", + urb->actual_length); + } else if (!urb->actual_length) { + netdev_warn(netdev, "actual_length = 0 (%d)\n", + urb->actual_length); + } + + count = urb->actual_length / F81604_DATA_SIZE; + + for (i = 0; i < count; ++i) { + ptr = &data[i * F81604_DATA_SIZE]; + + if (ptr[F81604_CMD_OFFSET] != F81604_CMD_DATA) + continue; + + skb = alloc_can_skb(netdev, &cf); + if (!skb) { + netdev_warn(netdev, "%s: not enough memory", __func__); + continue; + } + + cf->can_dlc = can_cc_dlc2len(ptr[F81604_DLC_OFFSET] & 0xF); + + if (ptr[F81604_DLC_OFFSET] & F81604_EFF_BIT) { + cf->can_id = (ptr[F81604_ID1_OFFSET] << 21) | + (ptr[F81604_ID2_OFFSET] << 13) | + (ptr[F81604_ID3_OFFSET] << 5) | + (ptr[F81604_ID4_OFFSET] >> 3); + cf->can_id |= CAN_EFF_FLAG; + } else { + cf->can_id = (ptr[F81604_ID1_OFFSET] << 3) | + (ptr[F81604_ID2_OFFSET] >> 5); + } + + if (ptr[F81604_DLC_OFFSET] & F81604_RTR_BIT) { + cf->can_id |= CAN_RTR_FLAG; + } else if (ptr[F81604_DLC_OFFSET] & F81604_EFF_BIT) { + memcpy(cf->data, &ptr[F81604_EFF_DATA_OFFSET], + cf->can_dlc); + } else { + memcpy(cf->data, &ptr[F81604_SFF_DATA_OFFSET], + cf->can_dlc); + } + + stats->rx_packets++; + stats->rx_bytes += cf->can_dlc; + netif_rx(skb); + } +} + +static void f81604_read_bulk_callback(struct urb *urb) +{ + struct net_device *netdev; + int status; + u8 *data; + + netdev = urb->context; + data = urb->transfer_buffer; + + if (!netif_device_present(netdev)) + return; + + switch (urb->status) { + case 0: /* success */ + break; + + case -ENOENT: + case -EPIPE: + case -EPROTO: + case -ESHUTDOWN: + netdev_info(netdev, "%s: URB aborted (%d)\n", __func__, + urb->status); + return; + + default: + netdev_info(netdev, "%s: URB aborted (%d)\n", __func__, + urb->status); + goto resubmit_urb; + } + + switch (data[F81604_CMD_OFFSET]) { + case F81604_CMD_DATA: + f81604_process_rx_packet(urb); + break; + default: + netdev_err(netdev, "unknown header: %x, len: %d\n", + data[F81604_CMD_OFFSET], urb->actual_length); + break; + } + +resubmit_urb: + status = usb_submit_urb(urb, GFP_ATOMIC); + if (status == -ENODEV) { + netif_device_detach(netdev); + } else if (status) { + netdev_err(netdev, "failed resubmitting read bulk urb: %d\n", + status); + } +} + +static void f81604_write_bulk_callback(struct urb *urb) +{ + struct f81604_port_priv *priv; + struct net_device *netdev; + int r; + + netdev = urb->context; + priv = netdev_priv(netdev); + + if (!netif_device_present(netdev)) + return; + + switch (urb->status) { + case 0: /* success */ + break; + + case -ENOENT: + case -EPIPE: + case -EPROTO: + case -ESHUTDOWN: + default: + netdev_info(netdev, "Tx URB error (%d)\n", urb->status); + return; + } + + r = can_get_echo_skb(netdev, 0, NULL); + if (r) + netdev_warn(netdev, "can_get_echo_skb() failed: %d\n", r); +} + +static void f81604_handle_clear_overrun_work(struct work_struct *work) +{ + struct f81604_port_priv *priv; + struct net_device *netdev; + + priv = container_of(work, struct f81604_port_priv, + handle_clear_overrun_work); + netdev = priv->netdev; + + f81604_set_sja1000_register(priv->dev, netdev->dev_id, SJA1000_CMR, + CMD_CDO); +} + +static void f81604_handle_clear_reg_work(struct work_struct *work) +{ + struct f81604_port_priv *priv; + struct net_device *netdev; + bool clear_ecc, clear_alc; + unsigned long flags; + u8 tmp; + + priv = container_of(work, struct f81604_port_priv, + handle_clear_reg_work); + netdev = priv->netdev; + + spin_lock_irqsave(&priv->lock, flags); + clear_alc = priv->need_clear_alc; + clear_ecc = priv->need_clear_ecc; + priv->need_clear_alc = false; + priv->need_clear_ecc = false; + spin_unlock_irqrestore(&priv->lock, flags); + + if (clear_alc) { + f81604_get_sja1000_register(priv->dev, netdev->dev_id, + SJA1000_ALC, &tmp); + } + + if (clear_ecc) { + f81604_get_sja1000_register(priv->dev, netdev->dev_id, + SJA1000_ECC, &tmp); + } +} + +static void f81604_read_int_callback(struct urb *urb) +{ + struct net_device_stats *stats; + struct f81604_port_priv *priv; + struct net_device *netdev; + struct can_frame *cf; + struct sk_buff *skb; + enum can_state can_state; + enum can_state rx_state, tx_state; + u8 *data; + u8 sr, isrc, alc, ecc; + u8 rxerr, txerr; + unsigned long flags; + int status; + + netdev = urb->context; + priv = netdev_priv(netdev); + stats = &netdev->stats; + can_state = priv->can.state; + data = urb->transfer_buffer; + + if (!netif_device_present(netdev)) + return; + + switch (urb->status) { + case 0: /* success */ + break; + + case -ENOENT: + case -EPIPE: + case -EPROTO: + case -ESHUTDOWN: + netdev_info(netdev, "%s: Int URB aborted (%d)\n", __func__, + urb->status); + return; + + default: + netdev_info(netdev, "%s: Int URB aborted (%d)\n", __func__, + urb->status); + goto resubmit_urb; + } + + /* Int EP Read data format: SR/IR/IER/ALC/ECC/EWLR/RXERR/TXERR/VAL + * Note: ALC/ECC will not auto clear by here, must to read clear by + * read register (via handle_clear_reg_work). + */ + sr = data[0]; + isrc = data[1]; + alc = data[3]; + ecc = data[4]; + rxerr = data[6]; + txerr = data[7]; + + /* handle can bus errors */ + if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) { + skb = alloc_can_err_skb(netdev, &cf); + if (!skb) { + netdev_warn(netdev, + "no memory to alloc_can_err_skb\n"); + goto resubmit_urb; + } + + cf->data[6] = txerr; + cf->data[7] = rxerr; + + if (isrc & IRQ_DOI) { + /* data overrun interrupt */ + netdev_dbg(netdev, "data overrun interrupt\n"); + cf->can_id |= CAN_ERR_CRTL; + cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; + stats->rx_over_errors++; + stats->rx_errors++; + + schedule_work(&priv->handle_clear_overrun_work); + } + + if (isrc & IRQ_EI) { + /* error warning interrupt */ + netdev_dbg(netdev, "error warning interrupt\n"); + + if (sr & SR_BS) + can_state = CAN_STATE_BUS_OFF; + else if (sr & SR_ES) + can_state = CAN_STATE_ERROR_WARNING; + else + can_state = CAN_STATE_ERROR_ACTIVE; + } + + if (isrc & IRQ_BEI) { + /* bus error interrupt */ + netdev_dbg(netdev, "bus error interrupt\n"); + + priv->can.can_stats.bus_error++; + stats->rx_errors++; + + cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; + + /* set error type */ + switch (ecc & ECC_MASK) { + case ECC_BIT: + cf->data[2] |= CAN_ERR_PROT_BIT; + break; + case ECC_FORM: + cf->data[2] |= CAN_ERR_PROT_FORM; + break; + case ECC_STUFF: + cf->data[2] |= CAN_ERR_PROT_STUFF; + break; + default: + break; + } + + /* set error location */ + cf->data[3] = ecc & ECC_SEG; + + /* Error occurred during transmission? */ + if ((ecc & ECC_DIR) == 0) + cf->data[2] |= CAN_ERR_PROT_TX; + + spin_lock_irqsave(&priv->lock, flags); + priv->need_clear_ecc = true; + spin_unlock_irqrestore(&priv->lock, flags); + + schedule_work(&priv->handle_clear_reg_work); + } + + if (isrc & IRQ_EPI) { + if (can_state == CAN_STATE_ERROR_PASSIVE) + can_state = CAN_STATE_ERROR_WARNING; + else + can_state = CAN_STATE_ERROR_PASSIVE; + + /* error passive interrupt */ + netdev_dbg(netdev, "error passive interrupt: %x\n", + can_state); + } + + if (isrc & IRQ_ALI) { + /* arbitration lost interrupt */ + netdev_dbg(netdev, "arbitration lost interrupt\n"); + + priv->can.can_stats.arbitration_lost++; + stats->tx_errors++; + cf->can_id |= CAN_ERR_LOSTARB; + cf->data[0] = alc & 0x1f; + + spin_lock_irqsave(&priv->lock, flags); + priv->need_clear_alc = true; + spin_unlock_irqrestore(&priv->lock, flags); + + schedule_work(&priv->handle_clear_reg_work); + } + + if (can_state != priv->can.state) { + tx_state = txerr >= rxerr ? can_state : 0; + rx_state = txerr <= rxerr ? can_state : 0; + + can_change_state(netdev, cf, tx_state, rx_state); + + if (can_state == CAN_STATE_BUS_OFF) + can_bus_off(netdev); + } + + stats->rx_packets++; + stats->rx_bytes += cf->can_dlc; + netif_rx(skb); + } + + /* handle TX */ + if ((isrc & IRQ_TI) && can_state != CAN_STATE_BUS_OFF) { + /* transmission buffer released */ + if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT && + !(sr & SR_TCS)) { + stats->tx_errors++; + can_free_echo_skb(netdev, 0, NULL); + } else { + /* transmission complete */ + stats->tx_bytes += can_get_echo_skb(netdev, 0, NULL); + stats->tx_packets++; + } + + netif_wake_queue(netdev); + } + +resubmit_urb: + status = usb_submit_urb(urb, GFP_ATOMIC); + if (status) { + netdev_err(netdev, + "%s: failed resubmitting int bulk urb: %d\n", + __func__, status); + + if (status == -ENODEV) + netif_device_detach(netdev); + } +} + +static netdev_tx_t f81604_start_xmit(struct sk_buff *skb, + struct net_device *netdev) +{ + struct net_device_stats *stats; + struct f81604_port_priv *priv; + struct can_frame *cf; + int status; + u8 *ptr; + u32 id; + + priv = netdev_priv(netdev); + cf = (struct can_frame *)skb->data; + stats = &netdev->stats; + + if (can_dropped_invalid_skb(netdev, skb)) + return NETDEV_TX_OK; + + netif_stop_queue(netdev); + + ptr = priv->bulk_write_buffer; + memset(ptr, 0, F81604_DATA_SIZE); + + ptr[0] = F81604_CMD_DATA; + ptr[1] = min_t(u8, cf->can_dlc & 0xf, 8); + + if (cf->can_id & CAN_EFF_FLAG) { + id = (cf->can_id & CAN_ERR_MASK) << 3; + ptr[1] |= F81604_EFF_BIT; + ptr[2] = (id >> 24) & 0xff; + ptr[3] = (id >> 16) & 0xff; + ptr[4] = (id >> 8) & 0xff; + ptr[5] = (id >> 0) & 0xff; + memcpy(&ptr[6], cf->data, ptr[1]); + } else { + id = (cf->can_id & CAN_ERR_MASK) << 5; + ptr[2] = (id >> 8) & 0xff; + ptr[3] = (id >> 0) & 0xff; + memcpy(&ptr[4], cf->data, ptr[1]); + } + + if (cf->can_id & CAN_RTR_FLAG) + ptr[1] |= F81604_RTR_BIT; + + can_put_echo_skb(skb, netdev, 0, 0); + + status = usb_submit_urb(priv->write_urb, GFP_ATOMIC); + if (status) { + netdev_err(netdev, "%s: failed resubmitting tx bulk urb: %d\n", + __func__, status); + + can_free_echo_skb(netdev, 0, NULL); + stats->tx_dropped++; + + if (status == -ENODEV) + netif_device_detach(netdev); + } + + return NETDEV_TX_OK; +} + +static int f81604_get_berr_counter(const struct net_device *netdev, + struct can_berr_counter *bec) +{ + struct f81604_port_priv *priv = netdev_priv(netdev); + int status; + u8 txerr; + u8 rxerr; + + status = f81604_get_sja1000_register(priv->dev, netdev->dev_id, + SJA1000_TXERR, &txerr); + if (status) + return status; + + status = f81604_get_sja1000_register(priv->dev, netdev->dev_id, + SJA1000_RXERR, &rxerr); + if (status) + return status; + + bec->txerr = txerr; + bec->rxerr = rxerr; + + return 0; +} + +static void f81604_remove_urbs(struct net_device *netdev) +{ + struct f81604_port_priv *priv = netdev_priv(netdev); + int i; + + for (i = 0; i < F81604_MAX_RX_URBS; ++i) + usb_free_urb(priv->read_urb[i]); + + usb_free_urb(priv->write_urb); + usb_free_urb(priv->int_urb); +} + +static int f81604_prepare_urbs(struct net_device *netdev) +{ + static u8 bulk_in_addr[F81604_MAX_DEV] = { 0x82, 0x84 }; + static u8 bulk_out_addr[F81604_MAX_DEV] = { 0x01, 0x03 }; + static u8 int_in_addr[F81604_MAX_DEV] = { 0x81, 0x83 }; + struct f81604_port_priv *priv; + int id; + int i; + + priv = netdev_priv(netdev); + id = netdev->dev_id; + + /* initialize to NULL for error recovery */ + for (i = 0; i < F81604_MAX_RX_URBS; ++i) + priv->read_urb[i] = NULL; + + priv->write_urb = NULL; + priv->int_urb = NULL; + + for (i = 0; i < F81604_MAX_RX_URBS; ++i) { + priv->read_urb[i] = usb_alloc_urb(0, GFP_KERNEL); + if (!priv->read_urb[i]) + goto error; + + usb_fill_bulk_urb(priv->read_urb[i], priv->dev, + usb_rcvbulkpipe(priv->dev, bulk_in_addr[id]), + priv->bulk_read_buffer[i], F81604_BULK_SIZE, + f81604_read_bulk_callback, netdev); + } + + priv->write_urb = usb_alloc_urb(0, GFP_KERNEL); + if (!priv->write_urb) + goto error; + + usb_fill_bulk_urb(priv->write_urb, priv->dev, + usb_sndbulkpipe(priv->dev, bulk_out_addr[id]), + priv->bulk_write_buffer, F81604_DATA_SIZE, + f81604_write_bulk_callback, netdev); + + priv->int_urb = usb_alloc_urb(0, GFP_KERNEL); + if (!priv->int_urb) + goto error; + + usb_fill_int_urb(priv->int_urb, priv->dev, + usb_rcvintpipe(priv->dev, int_in_addr[id]), + priv->int_read_buffer, F81604_INT_SIZE, + f81604_read_int_callback, netdev, 1); + + return 0; + +error: + f81604_remove_urbs(netdev); + return -ENOMEM; +} + +/* Open USB device */ +static int f81604_open(struct net_device *netdev) +{ + int err; + + err = f81604_prepare_urbs(netdev); + if (err) + return err; + + err = open_candev(netdev); + if (err) + goto remove_urbs; + + err = f81604_start(netdev); + if (err) + goto start_failed; + + netif_start_queue(netdev); + return 0; + +start_failed: + if (err == -ENODEV) + netif_device_detach(netdev); + + close_candev(netdev); + +remove_urbs: + f81604_remove_urbs(netdev); + + return err; +} + +/* Close USB device */ +static int f81604_close(struct net_device *netdev) +{ + struct f81604_port_priv *priv = netdev_priv(netdev); + + f81604_set_reset_mode(netdev); + + netif_stop_queue(netdev); + cancel_work_sync(&priv->handle_clear_overrun_work); + cancel_work_sync(&priv->handle_clear_reg_work); + close_candev(netdev); + + f81604_unregister_urbs(netdev); + f81604_remove_urbs(netdev); + + return 0; +} + +static const struct net_device_ops f81604_netdev_ops = { + .ndo_open = f81604_open, + .ndo_stop = f81604_close, + .ndo_start_xmit = f81604_start_xmit, + .ndo_change_mtu = can_change_mtu, +}; + +static const struct can_bittiming_const f81604_bittiming_const = { + .name = "f81604", + .tseg1_min = 1, + .tseg1_max = 16, + .tseg2_min = 1, + .tseg2_max = 8, + .sjw_max = 4, + .brp_min = 1, + .brp_max = 64, + .brp_inc = 1, +}; + +/* Called by the usb core when driver is unloaded or device is removed */ +static void f81604_disconnect(struct usb_interface *intf) +{ + struct f81604_priv *priv = usb_get_intfdata(intf); + int i; + + for (i = 0; i < F81604_MAX_DEV; ++i) { + if (!priv->netdev[i]) + continue; + + unregister_netdev(priv->netdev[i]); + free_candev(priv->netdev[i]); + } +} + +static int f81604_probe(struct usb_interface *intf, + const struct usb_device_id *id) +{ + struct f81604_port_priv *port_priv; + struct net_device *netdev; + struct f81604_priv *priv; + struct usb_device *dev; + int i, err; + + dev_info(&intf->dev, "Detected Fintek F81604 device.\n"); + dev_info(&intf->dev, + "Please download newest driver from Fintek website\n"); + dev_info(&intf->dev, "if you want to use customized functions.\n"); + + dev = interface_to_usbdev(intf); + + priv = devm_kzalloc(&intf->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + usb_set_intfdata(intf, priv); + + for (i = 0; i < F81604_MAX_DEV; ++i) { + netdev = alloc_candev(sizeof(*port_priv), 1); + if (!netdev) { + dev_err(&intf->dev, "Couldn't alloc candev: %d\n", i); + err = -ENOMEM; + + goto failure_cleanup; + } + + port_priv = netdev_priv(netdev); + netdev->dev_id = i; + + spin_lock_init(&port_priv->lock); + INIT_WORK(&port_priv->handle_clear_overrun_work, + f81604_handle_clear_overrun_work); + INIT_WORK(&port_priv->handle_clear_reg_work, + f81604_handle_clear_reg_work); + + port_priv->intf = intf; + port_priv->dev = dev; + port_priv->ocr = OCR_TX0_PUSHPULL | OCR_TX1_PUSHPULL; + port_priv->cdr = CDR_CBP; + port_priv->can.state = CAN_STATE_STOPPED; + port_priv->can.clock.freq = 24000000 / 2; + + port_priv->can.bittiming_const = &f81604_bittiming_const; + port_priv->can.do_set_bittiming = f81604_set_bittiming; + port_priv->can.do_set_mode = f81604_set_mode; + port_priv->can.do_get_berr_counter = f81604_get_berr_counter; + port_priv->can.ctrlmode_supported = + CAN_CTRLMODE_LISTENONLY | CAN_CTRLMODE_3_SAMPLES | + CAN_CTRLMODE_ONE_SHOT | CAN_CTRLMODE_BERR_REPORTING; + + port_priv->can.ctrlmode_supported |= CAN_CTRLMODE_PRESUME_ACK; + netdev->netdev_ops = &f81604_netdev_ops; + netdev->flags |= IFF_ECHO; + + SET_NETDEV_DEV(netdev, &intf->dev); + + err = register_candev(netdev); + if (err) { + netdev_err(netdev, + "couldn't register CAN device: %d\n", err); + free_candev(netdev); + + goto failure_cleanup; + } + + port_priv->netdev = netdev; + priv->netdev[i] = netdev; + + dev_info(&intf->dev, "Channel #%d registered as %s\n", i, + netdev->name); + } + + return 0; + +failure_cleanup: + f81604_disconnect(intf); + return err; +} + +static struct usb_driver f81604_driver = { + .name = "f81604", + .probe = f81604_probe, + .disconnect = f81604_disconnect, + .id_table = f81604_table, +}; + +module_usb_driver(f81604_driver); + +MODULE_AUTHOR("Ji-Ze Hong (Peter Hong) <peter_hong@xxxxxxxxxxxxx>"); +MODULE_DESCRIPTION("Fintek F81604 USB to 2xCANBUS"); +MODULE_LICENSE("GPL"); -- 2.17.1
