Re: [PATCH V3] can: usb: f81604: add Fintek F81604 support

From: Marc Kleine-Budde
Date: Mon Mar 27 2023 - 11:10:38 EST

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In reply to: Vincent MAILHOL: "Re: [PATCH V3] can: usb: f81604: add Fintek F81604 support"
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On 27.03.2023 13:10:48, Ji-Ze Hong (Peter Hong) wrote:
> This patch add support for Fintek USB to 2CAN controller support.

In addition to Vincent's comment, please describe your change
declarative, e.g.:

| Add support for the Fintek USB to 2CAN controller.

Please add an entry in the MAINTAINERS file.

> Signed-off-by: Ji-Ze Hong (Peter Hong) <peter_hong@xxxxxxxxxxxxx>

[...]

> 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

As Vincent said: Please sort the targets by alphabetical order, move the
entry in the Kconfig to the corresponding place.

> diff --git a/drivers/net/can/usb/f81604.c b/drivers/net/can/usb/f81604.c
> new file mode 100644
> index 000000000000..06cd5d95c44d
> --- /dev/null
> +++ b/drivers/net/can/usb/f81604.c
> @@ -0,0 +1,1232 @@
> +// 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/bitfield.h>
> +#include <linux/units.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_CAN_CLOCK (24 * MEGA / 2)
> +#define F81604_MAX_DEV 2
> +#define F81604_SET_DEVICE_RETRY 100
> +
> +#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_LEN_MASK 0x0f
> +#define F81604_DLC_EFF_BIT BIT(7)
> +#define F81604_DLC_RTR_BIT BIT(6)
> +
> +/* device setting */
> +#define F81604_CTRL_MODE_REG 0x80
> +#define F81604_TX_ONESHOT (0x03 << 3)
> +#define F81604_TX_NORMAL (0x01 << 3)
> +#define F81604_RX_AUTO_RELEASE_BUF BIT(1)
> +#define F81604_INT_WHEN_CHANGE BIT(0)
> +
> +#define F81604_TERMINATOR_REG 0x105
> +#define F81604_CAN0_TERM BIT(2)
> +#define F81604_CAN1_TERM BIT(3)
> +
> +#define F81604_TERMINATION_DISABLED CAN_TERMINATION_DISABLED
> +#define F81604_TERMINATION_ENABLED 120
> +

Please add the common prefix "F81604_" to these defines, too.

> +/* 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
> +#define SJA1000_MAX_FILTER_CNT 4

If these are SJA1000 registers, bits, also add SJA1000 as prefix.

> +
> +/* Common registers - manual section 6.5 */
> +#define SJA1000_BTR0 0x06
> +#define SJA1000_BTR1 0x07
> +#define SJA1000_BTR1_SAMPLE_TRIPLE BIT(7)
> +#define SJA1000_OCR 0x08
> +#define SJA1000_CDR 0x1F
> +
> +/* 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
> +
> +/* ALC register */
> +#define ALC_MASK 0x1f
> +
> +/* 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);
> +
> +static const struct ethtool_ops f81604_ethtool_ops = {
> + .get_ts_info = ethtool_op_get_ts_info,
> +};
> +
> +static const u16 f81604_termination[] = { F81604_TERMINATION_DISABLED,
> + F81604_TERMINATION_ENABLED };
> +
> +struct f81604_priv {
> + struct net_device *netdev[F81604_MAX_DEV];
> + struct mutex mutex; /* for terminator setting */
> +};
> +
> +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;

What about creating a u8 with 2 flags, use set_bit() and
test_and_clear_bit().

> +
> + struct work_struct handle_clear_reg_work;
> + struct work_struct handle_clear_overrun_work;

Can you combine both workers? Add a 3rd flag to the u8 you created
above.

> +
> + 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];

Please use an struct usb_anchor for this.

> + u8 bulk_read_buffer[F81604_MAX_RX_URBS][F81604_BULK_SIZE];

allocate the URB dynamic with kmalloc() and use urb->transfer_flags |=
URB_FREE_BUFFER for automatic free()ing.

> +
> + struct urb *write_urb;
> + u8 bulk_write_buffer[F81604_DATA_SIZE];

With just 1 TX URB the TX would be quite slow. Does your hardware
support more than 1 TX URB at a time? USB devices usually answer with
NAK it they are busy, automatic and transparent retry is handled by the
USB host controller.

> +
> + u8 ocr;
> + u8 cdr;

These are compile time constant, please remove.

> +};
> +
> +/* Interrupt endpoint data format: SR/IR/IER/ALC/ECC/EWLR/RXERR/TXERR/VAL */
> +struct f81604_int_data {
> + u8 sr;
> + u8 isrc;
> + u8 ier;
> + u8 alc;
> + u8 ecc;
> + u8 ewlr;
> + u8 rxerr;
> + u8 txerr;
> + u8 val;
> +} __packed;

I think this struct is always aligned to 4 bytes, so add a __aligned(4)
behind __packed.
> +
> +struct f81604_sff {
> + __be16 id;
> + u8 data[CAN_MAX_DLEN];
> +} __packed;

__aligned(2)

> +
> +struct f81604_eff {
> + __be32 id;
> + u8 data[CAN_MAX_DLEN];
> +} __packed;

__aligned(2)

> +
> +struct f81604_bulk_data {
> + u8 cmd;
> +
> + /* According for F81604 DLC define:
> + * #define F81604_DLC_LEN_MASK 0x0f
> + * #define F81604_DLC_EFF_BIT BIT(7)
> + * #define F81604_DLC_RTR_BIT BIT(6)

no need to duplicate code

> + */
> + u8 dlc;
> +
> + union {
> + struct f81604_sff sff;
> + struct f81604_eff eff;
> + };
> +} __packed;

__aligned(4)

> +
> +static int f81604_set_register(struct usb_device *dev, u16 reg, u8 data)

What about renaming these to f81604_write(), f81604_read().

I would change the 1st argument to struct f81604_port_priv *priv.

> +{
> + int ret;
> +
> + ret = usb_control_msg_send(dev, 0, F81604_SET_GET_REGISTER,
> + USB_TYPE_VENDOR | USB_DIR_OUT, 0, reg,
> + &data, sizeof(data), F81604_USB_TIMEOUT,
> + GFP_KERNEL);
> + if (ret)
> + dev_err(&dev->dev, "%s: reg: %x data: %x failed: %pe\n",
> + __func__, reg, data, ERR_PTR(ret));
> +
> + return ret;
> +}
> +
> +static int f81604_get_register(struct usb_device *dev, u16 reg, u8 *data)
> +{
> + int ret;
> +
> + ret = usb_control_msg_recv(dev, 0, F81604_SET_GET_REGISTER,
> + USB_TYPE_VENDOR | USB_DIR_IN, 0, reg, data,
> + sizeof(*data), F81604_USB_TIMEOUT,
> + GFP_KERNEL);
> +
> + if (ret < 0)
> + dev_err(&dev->dev, "%s: reg: %x failed: %pe\n", __func__, reg,
> + ERR_PTR(ret));
> +
> + return ret;
> +}
> +
> +static int f81604_mask_set_register(struct usb_device *dev, u16 reg, u8 mask,
> + u8 data)

...to f81604_update_bits().

> +{
> + int status;
> + u8 tmp;
> +
> + status = f81604_get_register(dev, reg, &tmp);
> + if (status)
> + return status;
> +
> + tmp &= ~mask;
> + tmp |= (mask & data);
> +
> + return f81604_set_register(dev, reg, tmp);
> +}
> +
> +static int f81604_set_sja1000_register(struct usb_device *dev, u8 port,
> + u16 reg, u8 data)

...to f81604_sja1000_read(), f81604_sja1000_write().

Make the first argument struct f81604_port_priv *priv, too, then you
don't need to pass port.

> +{
> + 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 < F81604_SET_DEVICE_RETRY; 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;
> + }
> +
> + return -EPERM;
> +}
> +
> +static int f81604_set_normal_mode(struct net_device *netdev)
> +{
> + struct f81604_port_priv *priv = netdev_priv(netdev);
> + u8 mod_reg = 0x00;
> + u8 tmp, ier = 0;
> + int status, i;
> +
> + for (i = 0; i < F81604_SET_DEVICE_RETRY; 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 */
> + ier = IRQ_ALL & ~IRQ_RI;
> + if (!(priv->can.ctrlmode &
> + CAN_CTRLMODE_BERR_REPORTING))
> + ier &= ~IRQ_BEI;
> +
> + return f81604_set_sja1000_register(priv->dev,
> + netdev->dev_id,
> + SJA1000_IER, ier);
> + }
> +
> + /* set chip to normal mode */
> + if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
> + mod_reg |= MOD_LOM;
> + if (priv->can.ctrlmode & CAN_CTRLMODE_PRESUME_ACK)
> + mod_reg |= MOD_STM;
> +
> + status = f81604_set_sja1000_register(priv->dev, netdev->dev_id,
> + SJA1000_MOD, mod_reg);
> + if (status)
> + return status;
> + }
> +
> + return -EPERM;
> +}
> +
> +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 < SJA1000_MAX_FILTER_CNT; ++i) {
> + status = f81604_set_sja1000_register(priv->dev, netdev->dev_id,
> + SJA1000_ACCC0 + i, 0);
> + if (status)
> + return status;
> + }
> +
> + for (i = 0; i < SJA1000_MAX_FILTER_CNT; ++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;
> +
> + for (i = 0; i < F81604_MAX_RX_URBS; ++i)
> + usb_kill_urb(priv->read_urb[i]);
> +
> + usb_kill_urb(priv->write_urb);
> + 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: %pe\n",
> + __func__, ERR_PTR(status));
> + return status;
> + }
> + }
> +
> + status = usb_submit_urb(priv->int_urb, GFP_KERNEL);
> + if (status) {
> + netdev_warn(netdev, "%s: submit int urb failed: %pe\n",
> + __func__, ERR_PTR(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,
> + F81604_CTRL_MODE_REG, mode);
> + if (status)
> + return status;
> +
> + /* set reset mode */
> + status = f81604_set_reset_mode(netdev);

I would make port_priv the first argument of all (internal) functions.

> + 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 = &priv->can.bittiming;
> + int status = 0;
> + u8 btr0, btr1;
> +
> + btr0 = FIELD_PREP(GENMASK(5, 0), bt->brp - 1) |
> + FIELD_PREP(GENMASK(7, 6), bt->sjw - 1);
> +
> + btr1 = FIELD_PREP(GENMASK(3, 0), bt->prop_seg + bt->phase_seg1 - 1) |
> + FIELD_PREP(GENMASK(6, 4), bt->phase_seg2 - 1);
> +
> + if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
> + btr1 |= SJA1000_BTR1_SAMPLE_TRIPLE;
> +
> + status = f81604_set_sja1000_register(priv->dev, dev->dev_id,
> + SJA1000_BTR0, btr0);
> + if (status) {
> + netdev_warn(dev, "%s: Set BTR0 failed: %pe\n", __func__,
> + ERR_PTR(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: %pe\n", __func__,
> + ERR_PTR(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 *netdev = urb->context;
> + struct net_device_stats *stats;
> + struct f81604_bulk_data *ptr;
> + struct can_frame *cf;
> + struct sk_buff *skb;
> + int i, count;

both should be unsigned.

> + u8 *data;
> +
> + WARN_ON(sizeof(*ptr) != F81604_DATA_SIZE);

WARN_ON is a runtime check and makes no sense on compile time constants.

> +
> + data = urb->transfer_buffer;
> + stats = &netdev->stats;
> +
> + if (urb->actual_length % F81604_DATA_SIZE)
> + netdev_warn(netdev, "actual_length %% %d != 0 (%d)\n",
> + F81604_DATA_SIZE, urb->actual_length);

Please rephrase, so that the normal user understands the problem, e.g.
"URB length %u not multiple of %u".

> + else if (!urb->actual_length)
> + netdev_warn(netdev, "actual_length = 0 (%d)\n",
> + urb->actual_length);

same here.

> +
> + count = urb->actual_length / F81604_DATA_SIZE;
> +
> + for (i = 0; i < count; ++i) {
> + ptr = (struct f81604_bulk_data *)&data[i * F81604_DATA_SIZE];
> +
> + if (ptr->cmd != F81604_CMD_DATA)
> + continue;
> +
> + skb = alloc_can_skb(netdev, &cf);
> + if (!skb) {

stats->rx_dropped++;
Don't write to the log, in OOM situations, other parts of the kernel
usually will write something.

> + netdev_warn(netdev, "%s: not enough memory", __func__);
> + continue;
> + }
> +
> + cf->len = can_cc_dlc2len(ptr->dlc & F81604_DLC_LEN_MASK);

If you claim to support CAN_CTRLMODE_CC_LEN8_DLC:

can_frame_set_cc_len((cf, dlc, priv->can.ctrlmode);

> +
> + if (ptr->dlc & F81604_DLC_EFF_BIT) {
> + cf->can_id = be32_to_cpu(ptr->eff.id) >> 3;
> + cf->can_id |= CAN_EFF_FLAG;
> + } else {
> + cf->can_id = be16_to_cpu(ptr->sff.id) >> 5;
> + }
> +
> + if (ptr->dlc & F81604_DLC_RTR_BIT)
> + cf->can_id |= CAN_RTR_FLAG;
> + else if (ptr->dlc & F81604_DLC_EFF_BIT)
> + memcpy(cf->data, ptr->eff.data, cf->len);
> + else
> + memcpy(cf->data, ptr->sff.data, cf->len);
> +
> + if (!(cf->can_id & CAN_RTR_FLAG))
> + stats->rx_bytes += cf->len;
> +
> + stats->rx_packets++;
> + netif_rx(skb);
> + }
> +}
> +
> +static void f81604_read_bulk_callback(struct urb *urb)
> +{
> + struct net_device *netdev = urb->context;
> + int status;
> +
> + if (!netif_device_present(netdev))
> + return;
> +
> + if (urb->status)
> + netdev_info(netdev, "%s: URB aborted %pe\n", __func__,
> + ERR_PTR(urb->status));
> +
> + switch (urb->status) {
> + case 0: /* success */
> + break;
> +
> + case -ENOENT:
> + case -EPIPE:
> + case -EPROTO:
> + case -ESHUTDOWN:
> + return;
> +
> + default:
> + goto resubmit_urb;
> + }
> +
> + f81604_process_rx_packet(urb);
> +
> +resubmit_urb:
> + status = usb_submit_urb(urb, GFP_ATOMIC);
> + if (status == -ENODEV)
> + netif_device_detach(netdev);
> + else if (status)
> + netdev_err(netdev,
> + "%s: failed to resubmit read bulk urb: %pe\n",
> + __func__, ERR_PTR(status));
> +}
> +
> +static void f81604_write_bulk_callback(struct urb *urb)
> +{
> + struct net_device *netdev = urb->context;
> +
> + if (!netif_device_present(netdev))
> + return;
> +
> + if (urb->status)
> + netdev_info(netdev, "%s: Tx URB error: %pe\n", __func__,
> + ERR_PTR(urb->status));
> +}
> +
> +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_handle_tx(struct urb *urb)
> +{
> + struct f81604_int_data *data = urb->transfer_buffer;
> + struct net_device *netdev = urb->context;
> + struct net_device_stats *stats;
> + struct f81604_port_priv *priv;
> +
> + priv = netdev_priv(netdev);
> + stats = &netdev->stats;
> +
> + if (!(data->isrc & IRQ_TI))
> + return;
> +
> + /* transmission buffer released */
> + if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT &&
> + !(data->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);
> +}
> +
> +static void f81604_read_int_callback(struct urb *urb)
> +{
> + struct f81604_int_data *data = urb->transfer_buffer;
> + struct net_device *netdev = urb->context;
> + struct net_device_stats *stats;
> + struct f81604_port_priv *priv;
> + enum can_state can_state;
> + enum can_state rx_state;
> + enum can_state tx_state;
> + struct can_frame *cf;
> + struct sk_buff *skb;
> + unsigned long flags;
> + int r;
> +
> + priv = netdev_priv(netdev);
> + can_state = priv->can.state;
> + stats = &netdev->stats;
> +
> + if (!netif_device_present(netdev))
> + return;
> +
> + if (urb->status)
> + netdev_info(netdev, "%s: Int URB aborted: %pe\n", __func__,
> + ERR_PTR(urb->status));
> +
> + switch (urb->status) {
> + case 0: /* success */
> + break;
> +
> + case -ENOENT:
> + case -EPIPE:
> + case -EPROTO:
> + case -ESHUTDOWN:
> + return;
> +
> + default:
> + goto resubmit_urb;
> + }
> +
> + /* Note: ALC/ECC will not auto clear by read here, must to clear by
^^^^^^^^^^^^^
must be cleared
> + * read register (via handle_clear_reg_work).
> + */
> +
> + /* handle can bus errors */
> + if (data->isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) {

Move this in a function....

> + skb = alloc_can_err_skb(netdev, &cf);

Please continue the error handling, even in case of OOM.

> + if (!skb) {
> + netdev_warn(netdev,
> + "no memory to alloc_can_err_skb\n");
> + goto resubmit_urb;
> + }
> +
> + cf->can_id |= CAN_ERR_CNT;
> + cf->data[6] = data->txerr;
> + cf->data[7] = data->rxerr;
> +
> + if (data->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 (data->isrc & IRQ_EI) {
> + /* error warning interrupt */
> + netdev_dbg(netdev, "error warning interrupt\n");
> +
> + if (data->sr & SR_BS)
> + can_state = CAN_STATE_BUS_OFF;
> + else if (data->sr & SR_ES)
> + can_state = CAN_STATE_ERROR_WARNING;
> + else
> + can_state = CAN_STATE_ERROR_ACTIVE;
> + }
> +
> + if (data->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 (data->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] = data->ecc & ECC_SEG;
> +
> + /* Error occurred during transmission? */
> + if ((data->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 (data->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: %d\n",
> + can_state);
> + }
> +
> + if (data->isrc & IRQ_ALI) {
> + /* arbitration lost interrupt */
> + netdev_dbg(netdev, "arbitration lost interrupt\n");
> +
> + priv->can.can_stats.arbitration_lost++;
> + stats->tx_errors++;

Don't increase tx_errors, see bd0ccb92efb0 ("can: sja1000:
sja1000_err(): don't count arbitration lose as an error").

> + cf->can_id |= CAN_ERR_LOSTARB;
> + cf->data[0] = data->alc & ALC_MASK;
> +
> + spin_lock_irqsave(&priv->lock, flags);
> + priv->need_clear_alc = true;
> + spin_unlock_irqrestore(&priv->lock, flags);
> +
> + schedule_work(&priv->handle_clear_reg_work);

I'd move the schedule work call to the end of
this..:
if (priv->work_flags)
schedule_work()
> + }
> +
> + if (can_state != priv->can.state) {
> + tx_state = data->txerr >= data->rxerr ? can_state : 0;
> + rx_state = data->txerr <= data->rxerr ? can_state : 0;
> +
> + can_change_state(netdev, cf, tx_state, rx_state);
> +
> + if (can_state == CAN_STATE_BUS_OFF)
> + can_bus_off(netdev);
> + }
> +
> + netif_rx(skb);
> + }
> +
> + /* handle TX */
> + if (can_state != CAN_STATE_BUS_OFF)

you might move the data->isrc & IRQ_TI check here

> + f81604_handle_tx(urb);

I'd change the signature to struct f81604_port_priv *, struct f81604_int_data *data.

> +
> +resubmit_urb:
> + r = usb_submit_urb(urb, GFP_ATOMIC);
> + if (r) {
> + netdev_err(netdev,
> + "%s: failed resubmitting int bulk urb: %pe\n",
> + __func__, ERR_PTR(r));
> +
> + if (r == -ENODEV)
> + netif_device_detach(netdev);
> + }
> +}
> +
> +static netdev_tx_t f81604_start_xmit(struct sk_buff *skb,
> + struct net_device *netdev)
> +{
> + struct can_frame *cf = (struct can_frame *)skb->data;
> + struct f81604_port_priv *priv = netdev_priv(netdev);
> + struct net_device_stats *stats = &netdev->stats;
> + struct f81604_bulk_data *ptr;
> + int status, len;
> +
> + if (can_dropped_invalid_skb(netdev, skb))
> + return NETDEV_TX_OK;
> +
> + netif_stop_queue(netdev);
> +
> + WARN_ON(sizeof(*ptr) != F81604_DATA_SIZE);

WARN_ON is a runtime check and makes no sense on compile time constants.

> +
> + ptr = (struct f81604_bulk_data *)priv->bulk_write_buffer;
> + memset(ptr, 0, F81604_DATA_SIZE);
> +
> + len = can_get_cc_dlc(cf, priv->can.ctrlmode);

This functions returns the "dlc" not the len. dlc might be > 8.

> + ptr->cmd = F81604_CMD_DATA;
> + ptr->dlc = len;
> +
> + if (cf->can_id & CAN_RTR_FLAG)
> + ptr->dlc |= F81604_DLC_RTR_BIT;
> +
> + if (cf->can_id & CAN_EFF_FLAG) {
> + ptr->eff.id = cpu_to_be32((cf->can_id & CAN_EFF_MASK) << 3);
> + ptr->dlc |= F81604_DLC_EFF_BIT;
> +
> + if (!(cf->can_id & CAN_RTR_FLAG))
> + memcpy(&ptr->eff.data, cf->data, len);

You must use cf->len instead of len here.

> + } else {
> + ptr->sff.id = cpu_to_be16((cf->can_id & CAN_SFF_MASK) << 5);
> +
> + if (!(cf->can_id & CAN_RTR_FLAG))
> + memcpy(&ptr->sff.data, cf->data, len);

You must use cf->len instead of len here.

> + }
> +
> + can_put_echo_skb(skb, netdev, 0, 0);
> +
> + status = usb_submit_urb(priv->write_urb, GFP_ATOMIC);
> + if (status) {
> + netdev_err(netdev, "%s: failed to resubmit tx bulk urb: %pe\n",
> + __func__, ERR_PTR(status));
> +
> + can_free_echo_skb(netdev, 0, NULL);
> + stats->tx_dropped++;
> +
> + if (status == -ENODEV)
> + netif_device_detach(netdev);

In the else path you probably want to netif_wake_queue()?

> + }
> +
> + 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_kill_anchored_urbs()

> +
> + usb_free_urb(priv->write_urb);
> + usb_free_urb(priv->int_urb);
> +}
> +
> +static int f81604_prepare_urbs(struct net_device *netdev)
> +{
> + static const u8 bulk_in_addr[F81604_MAX_DEV] = { 0x82, 0x84 };
> + static const u8 bulk_out_addr[F81604_MAX_DEV] = { 0x01, 0x03 };
> + static const u8 int_in_addr[F81604_MAX_DEV] = { 0x81, 0x83 };

Remove the 0x80 from the in endpoints, we need the proper endpoint
number here.

> + struct f81604_port_priv *priv = netdev_priv(netdev);
> + int id = netdev->dev_id;
> + int i;
> +
> + 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_anchor_urb()

> + 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);

Does the endpoint descriptor specify a proper interval?

> +
> + return 0;
> +
> +error:
> + f81604_remove_urbs(netdev);
> + return -ENOMEM;
> +}
> +
> +/* Open USB device */
> +static int f81604_open(struct net_device *netdev)
> +{
> + int err;
> +
> + err = open_candev(netdev);
> + if (err)
> + return err;
> +
> + 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);
> +
> + 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);
> +
> + 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) {
^^^^^^^^^^^^^^
ARRAY_SIZE(priv->netdev)

> + if (!priv->netdev[i])
> + continue;
> +
> + unregister_netdev(priv->netdev[i]);
> + f81604_remove_urbs(priv->netdev[i]);
> + free_candev(priv->netdev[i]);
> + }
> +}
> +
> +static int f81604_set_termination(struct net_device *netdev, u16 term)
> +{
> + struct f81604_port_priv *port_priv = netdev_priv(netdev);
> + struct f81604_priv *priv;
> + u8 mask, data = 0;
> + int r;
> +
> + priv = usb_get_intfdata(port_priv->intf);
> +
> + if (netdev->dev_id == 0)
> + mask = F81604_CAN0_TERM;
> + else
> + mask = F81604_CAN1_TERM;
> +
> + if (term == F81604_TERMINATION_ENABLED)
> + data = mask;
> +
> + mutex_lock(&priv->mutex);
> +
> + r = f81604_mask_set_register(port_priv->dev, F81604_TERMINATOR_REG,
> + mask, data);
> +
> + mutex_unlock(&priv->mutex);
> +
> + return r;
> +}
> +
> +static int f81604_probe(struct usb_interface *intf,
> + const struct usb_device_id *id)
> +{
> + struct usb_device *dev = interface_to_usbdev(intf);
> + struct f81604_port_priv *port_priv;
> + struct net_device *netdev;
> + struct f81604_priv *priv;
> + int i, err;
> +
> + 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) {
^^^^^^^^^^^^^^^^^^
same here
> + 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;
> +
> + mutex_init(&priv->mutex);
> + 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;

not need to assign

> + port_priv->can.clock.freq = F81604_CAN_CLOCK;
> +
> + port_priv->can.termination_const = f81604_termination;
> + port_priv->can.termination_const_cnt =
> + ARRAY_SIZE(f81604_termination);
> + 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_set_termination = f81604_set_termination;
> + 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 |
> + CAN_CTRLMODE_CC_LEN8_DLC | CAN_CTRLMODE_PRESUME_ACK;
> +
> + netdev->ethtool_ops = &f81604_ethtool_ops;
> + netdev->netdev_ops = &f81604_netdev_ops;
> + netdev->flags |= IFF_ECHO;
> +
> + SET_NETDEV_DEV(netdev, &intf->dev);
> +
> + err = f81604_set_termination(netdev,
> + F81604_TERMINATION_DISABLED);
> + if (err)
> + goto clean_candev;
> +
> + err = f81604_prepare_urbs(netdev);
> + if (err)
> + goto clean_candev;

In case of a failure, the driver leaks urb, as priv->netdev[i] is not
assigned.

> +
> + err = register_candev(netdev);
> + if (err)
> + goto clean_candev;
> +
> + port_priv->netdev = netdev;
> + priv->netdev[i] = netdev;
> +
> + dev_info(&intf->dev, "Channel #%d registered as %s\n", i,
> + netdev->name);
> + }
> +
> + return 0;
> +
> +clean_candev:
> + netdev_err(netdev, "couldn't enable CAN device: %pe\n", ERR_PTR(err));
> + free_candev(netdev);
> +
> +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
>
>

regards,
Marc

--
Pengutronix e.K. | Marc Kleine-Budde |
Embedded Linux | https://www.pengutronix.de |
Vertretung Nürnberg | Phone: +49-5121-206917-129 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |

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