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613 lines
15 KiB
613 lines
15 KiB
/**
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* @file panda.c
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* @author Jessy Diamond Exum
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* @date 16 June 2017
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* @version 0.1
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* @brief Driver for the Comma.ai Panda CAN adapter to allow it to be controlled via
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* the Linux SocketCAN interface.
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* @see https://github.com/commaai/panda for the full project.
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* @see Inspired by net/can/usb/mcba_usb.c from Linux Kernel 4.12-rc4.
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*/
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#include <linux/can.h>
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#include <linux/can/dev.h>
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#include <linux/can/error.h>
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#include <linux/init.h> // Macros used to mark up functions e.g., __init __exit
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#include <linux/kernel.h> // Contains types, macros, functions for the kernel
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#include <linux/module.h> // Core header for loading LKMs into the kernel
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#include <linux/netdevice.h>
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#include <linux/usb.h>
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/* vendor and product id */
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#define PANDA_MODULE_NAME "panda"
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#define PANDA_VENDOR_ID 0XBBAA
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#define PANDA_PRODUCT_ID 0XDDCC
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#define PANDA_MAX_TX_URBS 20
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#define PANDA_CTX_FREE PANDA_MAX_TX_URBS
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#define PANDA_USB_RX_BUFF_SIZE 0x40
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#define PANDA_USB_TX_BUFF_SIZE (sizeof(struct panda_usb_can_msg))
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#define PANDA_NUM_CAN_INTERFACES 3
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#define PANDA_CAN_TRANSMIT 1
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#define PANDA_CAN_EXTENDED 4
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#define PANDA_BITRATE 500000
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#define PANDA_DLC_MASK 0x0F
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struct panda_usb_ctx {
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struct panda_inf_priv *priv;
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u32 ndx;
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u8 dlc;
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};
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struct panda_dev_priv;
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struct panda_inf_priv {
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struct can_priv can;
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struct panda_usb_ctx tx_context[PANDA_MAX_TX_URBS];
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struct net_device *netdev;
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struct usb_anchor tx_submitted;
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atomic_t free_ctx_cnt;
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u8 interface_num;
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u8 mcu_can_ifnum;
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struct panda_dev_priv *priv_dev;
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};
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struct panda_dev_priv {
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struct usb_device *udev;
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struct device *dev;
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struct usb_anchor rx_submitted;
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struct panda_inf_priv *interfaces[PANDA_NUM_CAN_INTERFACES];
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};
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struct __packed panda_usb_can_msg {
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u32 rir;
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u32 bus_dat_len;
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u8 data[8];
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};
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static const struct usb_device_id panda_usb_table[] = {
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{ USB_DEVICE(PANDA_VENDOR_ID, PANDA_PRODUCT_ID) },
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{} /* Terminating entry */
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};
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MODULE_DEVICE_TABLE(usb, panda_usb_table);
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// panda: CAN1 = 0 CAN2 = 1 CAN3 = 4
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const int can_numbering[] = {0,1,4};
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struct panda_inf_priv *
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panda_get_inf_from_bus_id(struct panda_dev_priv *priv_dev, int bus_id){
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int inf_num;
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for(inf_num = 0; inf_num < PANDA_NUM_CAN_INTERFACES; inf_num++)
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if(can_numbering[inf_num] == bus_id)
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return priv_dev->interfaces[inf_num];
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return NULL;
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}
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// CTX handling shamlessly ripped from mcba_usb.c linux driver
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static inline void panda_init_ctx(struct panda_inf_priv *priv)
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{
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int i = 0;
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for (i = 0; i < PANDA_MAX_TX_URBS; i++) {
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priv->tx_context[i].ndx = PANDA_CTX_FREE;
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priv->tx_context[i].priv = priv;
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}
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atomic_set(&priv->free_ctx_cnt, ARRAY_SIZE(priv->tx_context));
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}
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static inline struct panda_usb_ctx *panda_usb_get_free_ctx(struct panda_inf_priv *priv,
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struct can_frame *cf)
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{
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int i = 0;
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struct panda_usb_ctx *ctx = NULL;
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for (i = 0; i < PANDA_MAX_TX_URBS; i++) {
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if (priv->tx_context[i].ndx == PANDA_CTX_FREE) {
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ctx = &priv->tx_context[i];
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ctx->ndx = i;
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ctx->dlc = cf->can_dlc;
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atomic_dec(&priv->free_ctx_cnt);
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break;
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}
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}
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printk("CTX num %d\n", atomic_read(&priv->free_ctx_cnt));
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if (!atomic_read(&priv->free_ctx_cnt)){
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/* That was the last free ctx. Slow down tx path */
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printk("SENDING TOO FAST\n");
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netif_stop_queue(priv->netdev);
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}
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return ctx;
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}
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/* panda_usb_free_ctx and panda_usb_get_free_ctx are executed by different
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* threads. The order of execution in below function is important.
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*/
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static inline void panda_usb_free_ctx(struct panda_usb_ctx *ctx)
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{
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/* Increase number of free ctxs before freeing ctx */
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atomic_inc(&ctx->priv->free_ctx_cnt);
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ctx->ndx = PANDA_CTX_FREE;
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/* Wake up the queue once ctx is marked free */
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netif_wake_queue(ctx->priv->netdev);
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}
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static void panda_urb_unlink(struct panda_inf_priv *priv)
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{
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usb_kill_anchored_urbs(&priv->priv_dev->rx_submitted);
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usb_kill_anchored_urbs(&priv->tx_submitted);
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}
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static int panda_set_output_enable(struct panda_inf_priv* priv, bool enable){
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return usb_control_msg(priv->priv_dev->udev,
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usb_sndctrlpipe(priv->priv_dev->udev, 0),
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0xDC, USB_TYPE_VENDOR | USB_RECIP_DEVICE,
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enable ? 0x1337 : 0, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
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}
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static void panda_usb_write_bulk_callback(struct urb *urb)
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{
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struct panda_usb_ctx *ctx = urb->context;
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struct net_device *netdev;
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WARN_ON(!ctx);
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netdev = ctx->priv->netdev;
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/* free up our allocated buffer */
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usb_free_coherent(urb->dev, urb->transfer_buffer_length,
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urb->transfer_buffer, urb->transfer_dma);
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if (!netif_device_present(netdev))
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return;
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netdev->stats.tx_packets++;
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netdev->stats.tx_bytes += ctx->dlc;
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can_get_echo_skb(netdev, ctx->ndx);
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if (urb->status)
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netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
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/* Release the context */
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panda_usb_free_ctx(ctx);
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}
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static netdev_tx_t panda_usb_xmit(struct panda_inf_priv *priv,
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struct panda_usb_can_msg *usb_msg,
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struct panda_usb_ctx *ctx)
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{
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struct urb *urb;
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u8 *buf;
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int err;
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/* create a URB, and a buffer for it, and copy the data to the URB */
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urb = usb_alloc_urb(0, GFP_ATOMIC);
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if (!urb)
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return -ENOMEM;
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buf = usb_alloc_coherent(priv->priv_dev->udev,
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PANDA_USB_TX_BUFF_SIZE, GFP_ATOMIC,
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&urb->transfer_dma);
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if (!buf) {
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err = -ENOMEM;
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goto nomembuf;
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}
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memcpy(buf, usb_msg, PANDA_USB_TX_BUFF_SIZE);
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usb_fill_bulk_urb(urb, priv->priv_dev->udev,
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usb_sndbulkpipe(priv->priv_dev->udev, 3), buf,
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PANDA_USB_TX_BUFF_SIZE, panda_usb_write_bulk_callback,
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ctx);
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urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
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usb_anchor_urb(urb, &priv->tx_submitted);
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err = usb_submit_urb(urb, GFP_ATOMIC);
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if (unlikely(err))
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goto failed;
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/* Release our reference to this URB, the USB core will eventually free it entirely. */
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usb_free_urb(urb);
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return 0;
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failed:
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usb_unanchor_urb(urb);
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usb_free_coherent(priv->priv_dev->udev, PANDA_USB_TX_BUFF_SIZE, buf, urb->transfer_dma);
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if (err == -ENODEV)
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netif_device_detach(priv->netdev);
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else
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netdev_warn(priv->netdev, "failed tx_urb %d\n", err);
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nomembuf:
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usb_free_urb(urb);
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return err;
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}
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static void panda_usb_process_can_rx(struct panda_dev_priv *priv_dev,
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struct panda_usb_can_msg *msg)
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{
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struct can_frame *cf;
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struct sk_buff *skb;
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int bus_num;
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struct panda_inf_priv *priv_inf;
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struct net_device_stats *stats;
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bus_num = (msg->bus_dat_len >> 4) & 0xf;
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priv_inf = panda_get_inf_from_bus_id(priv_dev, bus_num);
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if(!priv_inf){
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printk("Got something on an unused interface %d\n", bus_num);
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return;
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}
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printk("Recv bus %d\n", bus_num);
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stats = &priv_inf->netdev->stats;
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//u16 sid;
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if (!netif_device_present(priv_inf->netdev))
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return;
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skb = alloc_can_skb(priv_inf->netdev, &cf);
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if (!skb)
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return;
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if(msg->rir & PANDA_CAN_EXTENDED){
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cf->can_id = (msg->rir >> 3) | CAN_EFF_FLAG;
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}else{
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cf->can_id = (msg->rir >> 21);
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}
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// TODO: Handle Remote Frames
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//if (msg->dlc & MCBA_DLC_RTR_MASK)
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// cf->can_id |= CAN_RTR_FLAG;
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cf->can_dlc = get_can_dlc(msg->bus_dat_len & PANDA_DLC_MASK);
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memcpy(cf->data, msg->data, cf->can_dlc);
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stats->rx_packets++;
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stats->rx_bytes += cf->can_dlc;
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netif_rx(skb);
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}
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static void panda_usb_read_int_callback(struct urb *urb)
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{
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struct panda_dev_priv *priv_dev = urb->context;
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int retval;
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int pos = 0;
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int inf_num;
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switch (urb->status) {
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case 0: /* success */
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break;
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case -ENOENT:
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case -ESHUTDOWN:
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return;
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default:
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dev_info(priv_dev->dev, "Rx URB aborted (%d)\n", urb->status);
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goto resubmit_urb;
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}
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while (pos < urb->actual_length) {
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struct panda_usb_can_msg *msg;
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if (pos + sizeof(struct panda_usb_can_msg) > urb->actual_length) {
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dev_err(priv_dev->dev, "format error\n");
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break;
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}
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msg = (struct panda_usb_can_msg *)(urb->transfer_buffer + pos);
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panda_usb_process_can_rx(priv_dev, msg);
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pos += sizeof(struct panda_usb_can_msg);
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}
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resubmit_urb:
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usb_fill_int_urb(urb, priv_dev->udev,
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usb_rcvintpipe(priv_dev->udev, 1),
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urb->transfer_buffer, PANDA_USB_RX_BUFF_SIZE,
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panda_usb_read_int_callback, priv_dev, 5);
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retval = usb_submit_urb(urb, GFP_ATOMIC);
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if (retval == -ENODEV){
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for(inf_num = 0; inf_num < PANDA_NUM_CAN_INTERFACES; inf_num++)
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if(priv_dev->interfaces[inf_num])
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netif_device_detach(priv_dev->interfaces[inf_num]->netdev);
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}else if (retval)
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dev_err(priv_dev->dev, "failed resubmitting read bulk urb: %d\n", retval);
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}
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static int panda_usb_start(struct panda_dev_priv *priv_dev)
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{
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int err;
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struct urb *urb = NULL;
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u8 *buf;
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int inf_num;
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for(inf_num = 0; inf_num < PANDA_NUM_CAN_INTERFACES; inf_num++)
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panda_init_ctx(priv_dev->interfaces[inf_num]);
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err = usb_set_interface(priv_dev->udev, 0, 1);
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if (err) {
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dev_err(priv_dev->dev, "Can not set alternate setting to 1, error: %i", err);
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return err;
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}
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/* create a URB, and a buffer for it */
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urb = usb_alloc_urb(0, GFP_KERNEL);
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if (!urb) {
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return -ENOMEM;
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}
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buf = usb_alloc_coherent(priv_dev->udev, PANDA_USB_RX_BUFF_SIZE,
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GFP_KERNEL, &urb->transfer_dma);
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if (!buf) {
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dev_err(priv_dev->dev, "No memory left for USB buffer\n");
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usb_free_urb(urb);
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return -ENOMEM;
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}
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usb_fill_int_urb(urb, priv_dev->udev,
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usb_rcvintpipe(priv_dev->udev, 1),
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buf, PANDA_USB_RX_BUFF_SIZE,
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panda_usb_read_int_callback, priv_dev, 5);
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urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
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usb_anchor_urb(urb, &priv_dev->rx_submitted);
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err = usb_submit_urb(urb, GFP_KERNEL);
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if (err) {
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usb_unanchor_urb(urb);
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usb_free_coherent(priv_dev->udev, PANDA_USB_RX_BUFF_SIZE,
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buf, urb->transfer_dma);
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usb_free_urb(urb);
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dev_err(priv_dev->dev, "Failed in start, while submitting urb.\n");
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return err;
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}
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/* Drop reference, USB core will take care of freeing it */
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usb_free_urb(urb);
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return 0;
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}
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/* Open USB device */
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static int panda_usb_open(struct net_device *netdev)
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{
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struct panda_inf_priv *priv = netdev_priv(netdev);
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int err;
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/* common open */
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err = open_candev(netdev);
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if (err)
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return err;
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//priv->can_speed_check = true;
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priv->can.state = CAN_STATE_ERROR_ACTIVE;
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netif_start_queue(netdev);
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return 0;
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}
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/* Close USB device */
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static int panda_usb_close(struct net_device *netdev)
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{
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struct panda_inf_priv *priv = netdev_priv(netdev);
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priv->can.state = CAN_STATE_STOPPED;
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netif_stop_queue(netdev);
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/* Stop polling */
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panda_urb_unlink(priv);
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close_candev(netdev);
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return 0;
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}
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static netdev_tx_t panda_usb_start_xmit(struct sk_buff *skb,
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struct net_device *netdev)
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{
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struct panda_inf_priv *priv_inf = netdev_priv(netdev);
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struct can_frame *cf = (struct can_frame *)skb->data;
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struct panda_usb_ctx *ctx = NULL;
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struct net_device_stats *stats = &priv_inf->netdev->stats;
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int err;
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struct panda_usb_can_msg usb_msg = {};
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int bus = priv_inf->mcu_can_ifnum;
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if (can_dropped_invalid_skb(netdev, skb)){
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printk("Invalid CAN packet");
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return NETDEV_TX_OK;
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}
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ctx = panda_usb_get_free_ctx(priv_inf, cf);
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//Warning: cargo cult. Can't tell what this is for, but it is
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//everywhere and encouraged in the documentation.
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can_put_echo_skb(skb, priv_inf->netdev, ctx->ndx);
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if(cf->can_id & CAN_EFF_FLAG){
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usb_msg.rir = cpu_to_le32(((cf->can_id & 0x1FFFFFFF) << 3) |
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PANDA_CAN_TRANSMIT | PANDA_CAN_EXTENDED);
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}else{
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usb_msg.rir = cpu_to_le32(((cf->can_id & 0x7FF) << 21) | PANDA_CAN_TRANSMIT);
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}
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usb_msg.bus_dat_len = cpu_to_le32((cf->can_dlc & 0x0F) | (bus << 4));
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memcpy(usb_msg.data, cf->data, cf->can_dlc);
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//TODO Handle Remote Frames
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//if (cf->can_id & CAN_RTR_FLAG)
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// usb_msg.dlc |= PANDA_DLC_RTR_MASK;
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netdev_err(netdev, "Received data from socket. canid: %x; len: %d\n", cf->can_id, cf->can_dlc);
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err = panda_usb_xmit(priv_inf, &usb_msg, ctx);
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if (err)
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goto xmit_failed;
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return NETDEV_TX_OK;
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xmit_failed:
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can_free_echo_skb(priv_inf->netdev, ctx->ndx);
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panda_usb_free_ctx(ctx);
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dev_kfree_skb(skb);
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stats->tx_dropped++;
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return NETDEV_TX_OK;
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}
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static const struct net_device_ops panda_netdev_ops = {
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.ndo_open = panda_usb_open,
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.ndo_stop = panda_usb_close,
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.ndo_start_xmit = panda_usb_start_xmit,
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};
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static int panda_usb_probe(struct usb_interface *intf,
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const struct usb_device_id *id)
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{
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struct net_device *netdev;
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struct panda_inf_priv *priv_inf;
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int err = -ENOMEM;
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int inf_num;
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struct panda_dev_priv *priv_dev;
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struct usb_device *usbdev = interface_to_usbdev(intf);
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priv_dev = kzalloc(sizeof(struct panda_dev_priv), GFP_KERNEL);
|
|
if (!priv_dev) {
|
|
dev_err(&intf->dev, "Couldn't alloc priv_dev\n");
|
|
return -ENOMEM;
|
|
}
|
|
priv_dev->udev = usbdev;
|
|
priv_dev->dev = &intf->dev;
|
|
usb_set_intfdata(intf, priv_dev);
|
|
|
|
////// Interface privs
|
|
for(inf_num = 0; inf_num < PANDA_NUM_CAN_INTERFACES; inf_num++){
|
|
netdev = alloc_candev(sizeof(struct panda_inf_priv), PANDA_MAX_TX_URBS);
|
|
if (!netdev) {
|
|
dev_err(&intf->dev, "Couldn't alloc candev\n");
|
|
goto cleanup_candev;
|
|
}
|
|
netdev->netdev_ops = &panda_netdev_ops;
|
|
netdev->flags |= IFF_ECHO; /* we support local echo */
|
|
|
|
priv_inf = netdev_priv(netdev);
|
|
priv_inf->netdev = netdev;
|
|
priv_inf->priv_dev = priv_dev;
|
|
priv_inf->interface_num = inf_num;
|
|
priv_inf->mcu_can_ifnum = can_numbering[inf_num];
|
|
|
|
init_usb_anchor(&priv_dev->rx_submitted);
|
|
init_usb_anchor(&priv_inf->tx_submitted);
|
|
|
|
/* Init CAN device */
|
|
priv_inf->can.state = CAN_STATE_STOPPED;
|
|
priv_inf->can.bittiming.bitrate = PANDA_BITRATE;
|
|
|
|
SET_NETDEV_DEV(netdev, &intf->dev);
|
|
|
|
err = register_candev(netdev);
|
|
if (err) {
|
|
netdev_err(netdev, "couldn't register PANDA CAN device: %d\n", err);
|
|
free_candev(priv_inf->netdev);
|
|
goto cleanup_candev;
|
|
}
|
|
|
|
priv_dev->interfaces[inf_num] = priv_inf;
|
|
}
|
|
|
|
err = panda_usb_start(priv_dev);
|
|
if (err) {
|
|
dev_err(&intf->dev, "Failed to initialize Comma.ai Panda CAN controller\n");
|
|
goto cleanup_candev;
|
|
}
|
|
|
|
err = panda_set_output_enable(priv_inf, true);
|
|
if (err) {
|
|
dev_info(&intf->dev, "Failed to initialize send enable message to Panda.\n");
|
|
goto cleanup_candev;
|
|
}
|
|
|
|
dev_info(&intf->dev, "Comma.ai Panda CAN controller connected\n");
|
|
|
|
return 0;
|
|
|
|
cleanup_candev:
|
|
for(inf_num = 0; inf_num < PANDA_NUM_CAN_INTERFACES; inf_num++){
|
|
priv_inf = priv_dev->interfaces[inf_num];
|
|
if(priv_inf){
|
|
unregister_candev(priv_inf->netdev);
|
|
free_candev(priv_inf->netdev);
|
|
}else
|
|
break;
|
|
}
|
|
|
|
kfree(priv_dev);
|
|
|
|
return err;
|
|
}
|
|
|
|
/* Called by the usb core when driver is unloaded or device is removed */
|
|
static void panda_usb_disconnect(struct usb_interface *intf)
|
|
{
|
|
struct panda_dev_priv *priv_dev = usb_get_intfdata(intf);
|
|
struct panda_inf_priv *priv_inf;
|
|
int inf_num;
|
|
|
|
usb_set_intfdata(intf, NULL);
|
|
|
|
for(inf_num = 0; inf_num < PANDA_NUM_CAN_INTERFACES; inf_num++){
|
|
priv_inf = priv_dev->interfaces[inf_num];
|
|
if(priv_inf){
|
|
netdev_info(priv_inf->netdev, "device disconnected\n");
|
|
unregister_candev(priv_inf->netdev);
|
|
free_candev(priv_inf->netdev);
|
|
}else
|
|
break;
|
|
}
|
|
|
|
panda_urb_unlink(priv_inf);
|
|
kfree(priv_dev);
|
|
}
|
|
|
|
static struct usb_driver panda_usb_driver = {
|
|
.name = PANDA_MODULE_NAME,
|
|
.probe = panda_usb_probe,
|
|
.disconnect = panda_usb_disconnect,
|
|
.id_table = panda_usb_table,
|
|
};
|
|
|
|
module_usb_driver(panda_usb_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Jessy Diamond Exum <jessy.diamondman@gmail.com>");
|
|
MODULE_DESCRIPTION("SocketCAN driver for Comma.ai's Panda Adapter.");
|
|
MODULE_VERSION("0.1");
|
|
|