periodically reset HM-CFG-USB by enetring and leaving bootloader-mode

[hmcfgusb] / hmcfgusb.c

diff --git a/hmcfgusb.c b/hmcfgusb.c
index 1a6bb760eb36764eb2d9b2c736bcd4244db4778b..8261f1302ee13bcf250240625d664c2e4c167b9c 100644 (file)
--- a/hmcfgusb.c
+++ b/hmcfgusb.c
@@ -29,8 +29,15 @@
 #include <math.h>
 #include <poll.h>
 #include <errno.h>
+#include <sys/time.h>
 #include <libusb-1.0/libusb.h>
 
+/* Workaround for old libusb-1.0 */
+#ifndef LIBUSB_CALL
+#define LIBUSB_CALL
+#define libusb_handle_events_timeout_completed(ctx, tv, x) libusb_handle_events_timeout(ctx, tv)
+#endif
+
 #include "hexdump.h"
 #include "hmcfgusb.h"
 
@@ -38,6 +45,7 @@
 
 #define ID_VENDOR      0x1b1f
 #define ID_PRODUCT     0xc00f
+#define ID_PRODUCT_BL  0xc010
 
 /* TODO: dynamic */
 #define ASYNC_SIZE     0x0040
@@ -90,7 +98,7 @@ static char * usb_strerror(int e)
        return unknerr;
 }
 
-static libusb_device_handle *hmcfgusb_find() {
+static libusb_device_handle *hmcfgusb_find(int vid, int pid) {
        libusb_device_handle *devh = NULL;
        libusb_device **list;
        ssize_t cnt;
@@ -110,7 +118,7 @@ static libusb_device_handle *hmcfgusb_find() {
                if (err)
                        continue;
 
-               if ((desc.idVendor == ID_VENDOR) && (desc.idProduct == ID_PRODUCT)) {
+               if ((desc.idVendor == vid) && (desc.idProduct == pid)) {
                        libusb_device *dev = list[i];
 
                        err = libusb_open(dev, &devh);
@@ -139,13 +147,36 @@ static libusb_device_handle *hmcfgusb_find() {
        return NULL;
 }
 
+int hmcfgusb_send_null_frame(struct hmcfgusb_dev *usbdev, int silent)
+{
+       int err;
+       int cnt;
+       unsigned char out[0x40];
+
+       memset(out, 0, sizeof(out));
+
+       err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, out, 0, &cnt, USB_TIMEOUT);
+       if (err && (!silent)) {
+               fprintf(stderr, "Can't send null frame: %s\n", usb_strerror(err));
+               return 0;
+       }
+
+       return 1;
+}
+
 int hmcfgusb_send(struct hmcfgusb_dev *usbdev, unsigned char* send_data, int len, int done)
 {
        int err;
        int cnt;
+       struct timeval tv_start, tv_end;
+       int msec;
 
-       if (debug)
+       if (debug) {
                hexdump(send_data, len, "USB < ");
+       }
+
+       gettimeofday(&tv_start, NULL);
+
        err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, send_data, len, &cnt, USB_TIMEOUT);
        if (err) {
                fprintf(stderr, "Can't send data: %s\n", usb_strerror(err));
@@ -153,13 +184,20 @@ int hmcfgusb_send(struct hmcfgusb_dev *usbdev, unsigned char* send_data, int len
        }
 
        if (done) {
-               err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, send_data, 0, &cnt, USB_TIMEOUT);
-               if (err) {
-                       fprintf(stderr, "Can't send data: %s\n", usb_strerror(err));
+               if (!hmcfgusb_send_null_frame(usbdev, 0)) {
                        return 0;
                }
        }
 
+       gettimeofday(&tv_end, NULL);
+       msec = ((tv_end.tv_sec-tv_start.tv_sec)*1000)+((tv_end.tv_usec-tv_start.tv_usec)/1000);
+
+       if (msec > 100) {
+               fprintf(stderr, "usb-transfer took more than 100ms (%dms), this may lead to timing problems!\n", msec);
+       } else if (debug) {
+               fprintf(stderr, "usb-transfer took %dms!\n", msec);
+       }
+
        return 1;
 }
 
@@ -191,7 +229,6 @@ static struct libusb_transfer *hmcfgusb_prepare_int(libusb_device_handle *devh,
        if (err != 0) {
                fprintf(stderr, "Can't submit transfer: %s\n", usb_strerror(err));
                libusb_free_transfer(transfer);
-               free(data_buf);
                return NULL;
        }
 
@@ -213,12 +250,13 @@ static void LIBUSB_CALL hmcfgusb_interrupt(struct libusb_transfer *transfer)
 
        if (transfer->status != LIBUSB_TRANSFER_COMPLETED) {
                if (transfer->status != LIBUSB_TRANSFER_TIMED_OUT) {
-                       fprintf(stderr, "Interrupt transfer not completed: %d!\n", transfer->status);
+                       fprintf(stderr, "Interrupt transfer not completed: %s!\n", usb_strerror(transfer->status));
                        quit = EIO;
 
                        if (cb_data && cb_data->dev && cb_data->dev->transfer) {
                                libusb_free_transfer(cb_data->dev->transfer);
                                cb_data->dev->transfer = NULL;
+                               free(cb_data);
                        }
                        return;
                }
@@ -226,7 +264,18 @@ static void LIBUSB_CALL hmcfgusb_interrupt(struct libusb_transfer *transfer)
                if (cb_data && cb_data->cb) {
                        if (debug)
                                hexdump(transfer->buffer, transfer->actual_length, "USB > ");
-                       cb_data->cb(transfer->buffer, transfer->actual_length, cb_data->data);
+
+                       if (!cb_data->cb(transfer->buffer, transfer->actual_length, cb_data->data)) {
+                               quit = EIO;
+
+                               if (cb_data && cb_data->dev && cb_data->dev->transfer) {
+                                       libusb_free_transfer(cb_data->dev->transfer);
+                                       cb_data->dev->transfer = NULL;
+                                       free(cb_data);
+                               }
+
+                               return;
+                       }
                } else {
                        hexdump(transfer->buffer, transfer->actual_length, "> ");
                }
@@ -235,8 +284,9 @@ static void LIBUSB_CALL hmcfgusb_interrupt(struct libusb_transfer *transfer)
        err = libusb_submit_transfer(transfer);
        if (err != 0) {
                fprintf(stderr, "Can't re-submit transfer: %s\n", usb_strerror(err));
-               free(transfer->buffer);
                libusb_free_transfer(transfer);
+               cb_data->dev->transfer = NULL;
+               free(cb_data);
        }
 }
 
@@ -246,6 +296,7 @@ struct hmcfgusb_dev *hmcfgusb_init(hmcfgusb_cb_fn cb, void *data)
        const struct libusb_pollfd **usb_pfd = NULL;
        struct hmcfgusb_dev *dev = NULL;
        struct hmcfgusb_cb_data *cb_data = NULL;
+       int bootloader = 0;
        int err;
        int i;
 
@@ -255,10 +306,14 @@ struct hmcfgusb_dev *hmcfgusb_init(hmcfgusb_cb_fn cb, void *data)
                return NULL;
        }
 
-       devh = hmcfgusb_find();
+       devh = hmcfgusb_find(ID_VENDOR, ID_PRODUCT);
        if (!devh) {
-               fprintf(stderr, "Can't find/open hmcfgusb!\n");
-               return NULL;
+               devh = hmcfgusb_find(ID_VENDOR, ID_PRODUCT_BL);
+               if (!devh) {
+                       fprintf(stderr, "Can't find/open hmcfgusb!\n");
+                       return NULL;
+               }
+               bootloader = 1;
        }
 
        dev = malloc(sizeof(struct hmcfgusb_dev));
@@ -269,10 +324,13 @@ struct hmcfgusb_dev *hmcfgusb_init(hmcfgusb_cb_fn cb, void *data)
 
        memset(dev, 0, sizeof(struct hmcfgusb_dev));
        dev->usb_devh = devh;
+       dev->bootloader = bootloader;
+       dev->opened_at = time(NULL);
 
        cb_data = malloc(sizeof(struct hmcfgusb_cb_data));
        if (!cb_data) {
                perror("Can't allocate memory for hmcfgusb_cb_data");
+               free(dev);
                return NULL;
        }
 
@@ -285,6 +343,8 @@ struct hmcfgusb_dev *hmcfgusb_init(hmcfgusb_cb_fn cb, void *data)
        dev->transfer = hmcfgusb_prepare_int(devh, hmcfgusb_interrupt, cb_data);
        if (!dev->transfer) {
                fprintf(stderr, "Can't prepare async device io!\n");
+               free(dev);
+               free(cb_data);
                return NULL;
        }
 
@@ -292,6 +352,7 @@ struct hmcfgusb_dev *hmcfgusb_init(hmcfgusb_cb_fn cb, void *data)
        if (!usb_pfd) {
                fprintf(stderr, "Can't get FDset from libusb!\n");
                free(dev);
+               free(cb_data);
                return NULL;
        }
 
@@ -302,6 +363,8 @@ struct hmcfgusb_dev *hmcfgusb_init(hmcfgusb_cb_fn cb, void *data)
        dev->pfd = malloc(dev->n_usb_pfd * sizeof(struct pollfd));
        if (!dev->pfd) {
                perror("Can't allocate memory for poll-fds");
+               free(dev);
+               free(cb_data);
                return NULL;
        }
 
@@ -342,6 +405,7 @@ int hmcfgusb_poll(struct hmcfgusb_dev *dev, int timeout)
 {
        struct timeval tv;
        int usb_event = 0;
+       int timed_out = 0;
        int i;
        int n;
        int fd_n;
@@ -361,6 +425,9 @@ int hmcfgusb_poll(struct hmcfgusb_dev *dev, int timeout)
        } else {
                if ((tv.tv_sec == 0) && (tv.tv_usec == 0)) {
                        usb_event = 1;
+               } else if (tv.tv_sec > timeout) {
+                       tv.tv_sec = timeout;
+                       tv.tv_usec = 0;
                }
        }
 
@@ -376,6 +443,7 @@ int hmcfgusb_poll(struct hmcfgusb_dev *dev, int timeout)
                        return -1;
                } else if (n == 0) {
                        usb_event = 1;
+                       timed_out = 1;
                } else {
                        for (fd_n = 0; fd_n < dev->n_pfd; fd_n++) {
                                if (dev->pfd[fd_n].revents) {
@@ -407,9 +475,28 @@ int hmcfgusb_poll(struct hmcfgusb_dev *dev, int timeout)
                errno = quit;
        }
 
+       if (timed_out)
+               errno = ETIMEDOUT;
+
        return -1;
 }
 
+void hmcfgusb_enter_bootloader(struct hmcfgusb_dev *dev)
+{
+       uint8_t out[ASYNC_SIZE];
+
+       if (dev->bootloader) {
+               fprintf(stderr, "request for bootloader mode, but device already in bootloader!\n");
+               return;
+       }
+
+       memset(out, 0, sizeof(out));
+       out[0] = 'B';
+       hmcfgusb_send(dev, out, sizeof(out), 1);
+
+       return;
+}
+
 void hmcfgusb_close(struct hmcfgusb_dev *dev)
 {
        int err;