From 464847c5b25588448e550017a6d91447c076b944 Mon Sep 17 00:00:00 2001
From: Tomasz Kramkowski <tk@the-tk.com>
Date: Wed, 23 Nov 2016 21:23:09 +0000
Subject: init commit

---
 halfkay.c | 164 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 164 insertions(+)
 create mode 100644 halfkay.c

(limited to 'halfkay.c')

diff --git a/halfkay.c b/halfkay.c
new file mode 100644
index 0000000..c2a92a9
--- /dev/null
+++ b/halfkay.c
@@ -0,0 +1,164 @@
+/*  HalfKay implementation
+ *  Based on Teensy Loader (cli) (http://www.pjrc.com/teensy/loader_cli.html)
+ *
+ * Copyright (C) 2016  Tomasz Kramkowski <tk@the-tk.com>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#define _DEFAULT_SOURCE
+#include <assert.h>
+#include <errno.h>
+#include <libusb-1.0/libusb.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "halfkay.h"
+#include "log.h"
+
+enum {
+	HK_USB_VID = 0x16c0,
+	HK_USB_PID = 0x0478,
+	HK_USB_REQTYP = (LIBUSB_ENDPOINT_OUT \
+			 | LIBUSB_REQUEST_TYPE_CLASS \
+			 | LIBUSB_RECIPIENT_INTERFACE),
+	HK_USB_REQ = LIBUSB_REQUEST_SET_CONFIGURATION,
+	HK_USB_VAL = 0x200,
+};
+
+libusb_device_handle *hk_usb_hnd;
+
+static inline void libusb_err(const char *action, int code)
+{
+	error(0, "libusb %s failed: %s", action, libusb_strerror(code));
+}
+
+static void usbopen(void)
+{
+	int rc;
+
+	rc = libusb_init(NULL);
+	if (libusb_init(NULL) != LIBUSB_SUCCESS)
+		libusb_err("init", rc);
+
+	hk_usb_hnd = libusb_open_device_with_vid_pid(NULL, HK_USB_VID, HK_USB_PID);
+	if (!hk_usb_hnd)
+		error(0, "HalfKay device not found");
+
+	libusb_set_auto_detach_kernel_driver(hk_usb_hnd, 1);
+	rc = libusb_claim_interface(hk_usb_hnd, 0);
+	if (rc < 0)
+		libusb_err("claim", rc);
+}
+
+static void usbclose(void)
+{
+	libusb_release_interface(hk_usb_hnd, 0);
+	libusb_close(hk_usb_hnd);
+	libusb_exit(NULL);
+}
+
+static void usbsendcmd(void *data, size_t size, bool firstxfer)
+{
+	unsigned int timeout = firstxfer ? 3000 : 2000;
+	int rc;
+
+	rc = libusb_control_transfer(hk_usb_hnd, HK_USB_REQTYP, HK_USB_REQ,
+				     HK_USB_VAL, 0, data, size, timeout);
+
+	if (rc < 0)
+		libusb_err("transfer", rc);
+
+	/* TODO: Replace this with the correct way to handle a halt... ffs idiot */
+	usleep(10000); /* HalfKay says no if you write too fast */
+}
+
+static void fmtcmd(void *_dest, const struct flashparams *fp, size_t addr)
+{
+	unsigned char *dest = _dest;
+
+	addr >>= fp->addrshft;
+	for (size_t i = 0; i < fp->cmdsz; i++)
+		dest[i] = (addr >> (i * CHAR_BIT)) & 0xFF;
+}
+
+int flash(const struct flashparams *fp, const char *file)
+{
+	FILE *f;
+	unsigned char *cmd;
+	size_t tsize;
+
+	assert(file);
+
+	/* TODO: move checks to parser */
+	/*if (!fp->blksz || !(fp->blksz & fp->blksz - 1))*/
+		/*error(0, "Block size is not a power of 2");*/
+	/*if (fp->memsz % fp->blksz)*/
+		/*error(0, "Memory size is not divisible by block size");*/
+
+	tsize = fp->blksz + fp->cmdsz;
+
+	f = fopen(file, "rb");
+	if (!f)
+		error(errno, EMSG_OPEN, file);
+
+	/* TODO: precalc and check ovf */
+	cmd = malloc(tsize);
+	if (!cmd)
+		error(errno, EMSG_ALLOC);
+
+	usbopen();
+
+	for (size_t blkaddr = 0; blkaddr < fp->memsz; blkaddr += fp->blksz) {
+		size_t count;
+
+		fmtcmd(cmd, fp, blkaddr);
+		count = fread(cmd + fp->cmdsz, 1, fp->blksz, f);
+		if (count == 0)
+			break;
+		if (count < fp->blksz) {
+			memset(cmd + fp->cmdsz + count, 0, fp->blksz - count);
+		}
+
+		usbsendcmd(cmd, tsize, blkaddr == 0);
+	}
+
+	if (!feof(f))
+		fprintf(stderr, "Device ran out of space during writing!");
+
+	usbclose();
+
+	free(cmd);
+	fclose(f);
+
+	return 0;
+}
+
+int reboot(const struct flashparams *fp)
+{
+	size_t tsize = fp->blksz + fp->cmdsz;
+	unsigned char *cmd = malloc(tsize);
+
+	usbopen();
+
+	fmtcmd(cmd, fp, SIZE_MAX);
+	usbsendcmd(cmd, tsize, true);
+
+	usbclose();
+
+	return 0;
+}
-- 
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