Release 260111

panda/drivers/linux/Makefile

@@ -0,0 +1,24 @@
+VERSION=0.0.1
+obj-m+=panda.o
+
+all:	build install
+
+build:
+	sudo dkms build panda/$(VERSION)
+
+install:
+	sudo dkms install panda/$(VERSION)
+
+remove:
+	sudo dkms remove panda/$(VERSION) --all
+
+uninstall:
+	sudo dkms uninstall panda/$(VERSION)
+
+clean:	remove
+
+link:
+	sudo dkms add `pwd`
+
+unload:
+	sudo rmmod panda

panda/drivers/linux/README.md

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+# Linux driver
+Installs the panda linux kernel driver using DKMS.
+
+This will allow the panda to work with tools such as `can-utils`
+
+## Prerequisites
+ - `apt-get install dkms gcc linux-headers-$(uname -r) make sudo`
+
+## Installation
+ - `make all`
+ - `make link` (optional, setup to build/install when kernel is updated)
+
+## Uninstall
+ - `make clean`
+
+## Usage
+
+You will need to bring it up using `sudo ifconfig can0 up` or
+`sudo ip link set dev can0 up`, depending on your platform.
+
+Note that you may have to setup udev rules for Linux
+``` bash
+sudo tee /etc/udev/rules.d/11-panda.rules <<EOF
+SUBSYSTEM=="usb", ATTRS{idVendor}=="3801", ATTRS{idProduct}=="ddcc", MODE="0666"
+SUBSYSTEM=="usb", ATTRS{idVendor}=="3801", ATTRS{idProduct}=="ddee", MODE="0666"
+EOF
+sudo udevadm control --reload-rules && sudo udevadm trigger
+```

panda/drivers/linux/dkms.conf

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+PACKAGE_NAME="panda"
+PACKAGE_VERSION="0.0.1"
+BUILT_MODULE_NAME[0]="panda"
+DEST_MODULE_LOCATION[0]="/kernel/drivers/net/panda/"
+AUTOINSTALL="yes"
+

panda/drivers/linux/test/Makefile

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+all:
+	gcc main.c -o cantest -pthread -lpthread

panda/drivers/linux/test/run.sh

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+#!/usr/bin/env bash
+sudo ifconfig can0 up
+make
+./cantest

panda/drivers/spi/Makefile

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+obj-m += spidev_panda.o
+
+KDIR := /lib/modules/$(shell uname -r)/build
+PWD := $(shell pwd)
+
+# GCC9 bug, apply kernel patch instead?
+# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0b999ae3614d09d97a1575936bcee884f912b10e 
+ccflags-y := -Wno-missing-attributes
+
+default:
+	$(MAKE) -C $(KDIR) M=$(PWD) modules
+
+clean:
+	$(MAKE) -C $(KDIR) M=$(PWD) clean

panda/drivers/spi/load.sh

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+#!/usr/bin/env bash
+set -e
+
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null && pwd)"
+cd $DIR
+
+make -j8
+
+sudo su -c "echo spi0.0 > /sys/bus/spi/drivers/spidev/unbind" || true
+
+sudo dmesg -C
+
+#sudo rmmod -f spidev_panda
+sudo rmmod spidev_panda || true
+sudo insmod spidev_panda.ko
+
+sudo su -c "echo 'file $DIR/spidev_panda.c +p' > /sys/kernel/debug/dynamic_debug/control"
+sudo su -c "echo 'file $DIR/spi_panda.h +p' > /sys/kernel/debug/dynamic_debug/control"
+
+sudo lsmod
+
+echo "loaded"
+ls -la /dev/spi*
+sudo chmod 666 /dev/spi*
+ipython -c "from panda import Panda; print(Panda.list())"
+KERN=1 ipython -c "from panda import Panda; print(Panda.list())"
+dmesg

panda/drivers/spi/patch

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+53c53,54
+< #define SPIDEV_MAJOR			153	/* assigned */
+---
+> int SPIDEV_MAJOR = 0;
+> //#define SPIDEV_MAJOR			153     /* assigned */
+354a356,358
+> 
+> #include "spi_panda.h"
+> 
+413,414c417,419
+< 		retval = __put_user((spi->mode & SPI_LSB_FIRST) ?  1 : 0,
+< 					(__u8 __user *)arg);
+---
+> 		retval = panda_transfer(spidev, spi, arg);
+> 		//retval = __put_user((spi->mode & SPI_LSB_FIRST) ?  1 : 0,
+> 		//			(__u8 __user *)arg);
+697,698d701
+< 	{ .compatible = "rohm,dh2228fv" },
+< 	{ .compatible = "lineartechnology,ltc2488" },
+831c834
+< 		.name =		"spidev",
+---
+> 		.name =		"spidev_panda",
+856c859
+< 	status = register_chrdev(SPIDEV_MAJOR, "spi", &spidev_fops);
+---
+> 	status = register_chrdev(0, "spi", &spidev_fops);
+860c863,865
+< 	spidev_class = class_create(THIS_MODULE, "spidev");
+---
+> 	SPIDEV_MAJOR = status;
+> 
+> 	spidev_class = class_create(THIS_MODULE, "spidev_panda");

panda/drivers/spi/pull-src.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+set -e
+
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null && pwd)"
+cd $DIR
+
+rm -f spidev.c
+wget https://raw.githubusercontent.com/commaai/agnos-kernel-sdm845/master/drivers/spi/spidev.c
+
+# diff spidev.c spidev_panda.c > patch
+# git diff --no-index spidev.c spidev_panda.c
+patch -o spidev_panda.c spidev.c -i patch

panda/drivers/spi/spi_panda.h

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+#include <linux/delay.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/spidev.h>
+
+#define SPI_SYNC 0x5AU
+#define SPI_HACK 0x79U
+#define SPI_DACK 0x85U
+#define SPI_NACK 0x1FU
+#define SPI_CHECKSUM_START 0xABU
+
+struct __attribute__((packed)) spi_header {
+  u8 sync;
+  u8 endpoint;
+  uint16_t tx_len;
+  uint16_t max_rx_len;
+};
+
+struct spi_panda_transfer {
+  __u64 rx_buf;
+  __u64 tx_buf;
+  __u32 tx_length;
+  __u32 rx_length_max;
+  __u32 timeout;
+  __u8 endpoint;
+  __u8 expect_disconnect;
+};
+
+static u8 panda_calc_checksum(u8 *buf, u16 length) {
+  int i;
+  u8 checksum = SPI_CHECKSUM_START;
+  for (i = 0U; i < length; i++) {
+    checksum ^= buf[i];
+  }
+  return checksum;
+}
+
+static long panda_wait_for_ack(struct spidev_data *spidev, u8 ack_val, u8 length) {
+  int i;
+  int ret;
+  for (i = 0; i < 1000; i++) {
+    ret = spidev_sync_read(spidev, length);
+    if (ret < 0) {
+      return ret;
+    }
+
+    if (spidev->rx_buffer[0] == ack_val) {
+      return 0;
+    } else if (spidev->rx_buffer[0] == SPI_NACK) {
+      return -2;
+    }
+    if (i > 20) usleep_range(10, 20);
+  }
+  return -1;
+}
+
+static long panda_transfer_raw(struct spidev_data *spidev, struct spi_device *spi, unsigned long arg) {
+  u16 rx_len;
+  long retval = -1;
+  struct spi_header header;
+  struct spi_panda_transfer pt;
+
+  struct spi_transfer t = {
+    .len = 0,
+    .tx_buf = spidev->tx_buffer,
+    .rx_buf = spidev->rx_buffer,
+    .speed_hz = spidev->spi->max_speed_hz,
+  };
+
+  struct spi_message m;
+  spi_message_init(&m);
+  spi_message_add_tail(&t, &m);
+
+  // read struct from user
+  if (!access_ok(VERIFY_WRITE, arg, sizeof(pt))) {
+    return -1;
+  }
+  if (copy_from_user(&pt, (void __user *)arg, sizeof(pt))) {
+    return -1;
+  }
+  dev_dbg(&spi->dev, "ep: %d, tx len: %d\n", pt.endpoint, pt.tx_length);
+
+  // send header
+  header.sync = 0x5a;
+  header.endpoint = pt.endpoint;
+  header.tx_len = pt.tx_length;
+  header.max_rx_len = pt.rx_length_max;
+  memcpy(spidev->tx_buffer, &header, sizeof(header));
+  spidev->tx_buffer[sizeof(header)] = panda_calc_checksum(spidev->tx_buffer, sizeof(header));
+
+  t.len = sizeof(header) + 1;
+  retval = spidev_sync(spidev, &m);
+  if (retval < 0) {
+    dev_dbg(&spi->dev, "spi xfer failed %ld\n", retval);
+    return retval;
+  }
+
+  // wait for ACK
+  retval = panda_wait_for_ack(spidev, SPI_HACK, 1);
+  if (retval < 0) {
+    dev_dbg(&spi->dev, "no header ack %ld\n", retval);
+    return retval;
+  }
+
+  // send data
+  dev_dbg(&spi->dev, "sending data\n");
+  retval = copy_from_user(spidev->tx_buffer, (const u8 __user *)(uintptr_t)pt.tx_buf, pt.tx_length);
+  spidev->tx_buffer[pt.tx_length] = panda_calc_checksum(spidev->tx_buffer, pt.tx_length);
+  t.len = pt.tx_length + 1;
+  retval = spidev_sync(spidev, &m);
+
+  if (pt.expect_disconnect) {
+    return 0;
+  }
+
+  // wait for ACK
+  retval = panda_wait_for_ack(spidev, SPI_DACK, 3);
+  if (retval < 0) {
+    dev_dbg(&spi->dev, "no data ack\n");
+    return retval;
+  }
+
+  // get response
+  t.rx_buf = spidev->rx_buffer + 3;
+  rx_len = (spidev->rx_buffer[2] << 8) | (spidev->rx_buffer[1]);
+  dev_dbg(&spi->dev, "rx len %u\n", rx_len);
+  if (rx_len > pt.rx_length_max) {
+    dev_dbg(&spi->dev, "RX len greater than max\n");
+    return -1;
+  }
+
+  // do the read
+  t.len = rx_len + 1;
+  retval = spidev_sync(spidev, &m);
+  if (retval < 0) {
+    dev_dbg(&spi->dev, "spi xfer failed %ld\n", retval);
+    return retval;
+  }
+  if (panda_calc_checksum(spidev->rx_buffer, 3 + rx_len + 1) != 0) {
+    dev_dbg(&spi->dev, "bad checksum\n");
+    return -1;
+  }
+
+  retval = copy_to_user((u8 __user *)(uintptr_t)pt.rx_buf, spidev->rx_buffer + 3, rx_len);
+
+  return rx_len;
+}
+
+static long panda_transfer(struct spidev_data *spidev, struct spi_device *spi, unsigned long arg) {
+  int i;
+  int ret;
+  dev_dbg(&spi->dev, "=== XFER start ===\n");
+  for (i = 0; i < 20; i++) {
+    ret = panda_transfer_raw(spidev, spi, arg);
+    if (ret >= 0) {
+      break;
+    }
+  }
+  dev_dbg(&spi->dev, "took %d tries\n", i+1);
+  return ret;
+}