all: update year in copyright
[hmcfgusb] / hmcfgusb.c
index 05f16bed4f10a1b2284b2a98b230cca0896b5da7..bcb85a4a75e2417e6c26fa73e1ce5c8824a2e416 100644 (file)
@@ -1,6 +1,6 @@
 /* HM-CFG-USB libusb-driver
  *
- * Copyright (c) 2013 Michael Gernoth <michael@gernoth.net>
+ * Copyright (c) 2013-16 Michael Gernoth <michael@gernoth.net>
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to
 #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"
 
@@ -52,6 +58,7 @@
 
 static int quit = 0;
 static int debug = 0;
+static int libusb_initialized = 0;
 
 /* Not in all libusb-1.0 versions, so we have to roll our own :-( */
 static char * usb_strerror(int e)
@@ -92,7 +99,7 @@ static char * usb_strerror(int e)
        return unknerr;
 }
 
-static libusb_device_handle *hmcfgusb_find() {
+static libusb_device_handle *hmcfgusb_find(int vid, int pid, char *serial) {
        libusb_device_handle *devh = NULL;
        libusb_device **list;
        ssize_t cnt;
@@ -112,44 +119,73 @@ static libusb_device_handle *hmcfgusb_find() {
                if (err)
                        continue;
 
-               if ((desc.idVendor == ID_VENDOR) &&
-                   ((desc.idProduct == ID_PRODUCT) || (desc.idProduct == ID_PRODUCT_BL))) {
+               if ((desc.idVendor == vid) && (desc.idProduct == pid)) {
                        libusb_device *dev = list[i];
 
                        err = libusb_open(dev, &devh);
                        if (err) {
                                fprintf(stderr, "Can't open device: %s\n", usb_strerror(err));
+                               libusb_free_device_list(list, 1);
                                return NULL;
                        }
 
+                       if (serial) {
+                               if (desc.iSerialNumber > 0) {
+                                       uint8_t devSerial[256];
+                                       err = libusb_get_string_descriptor_ascii(devh, desc.iSerialNumber, devSerial, sizeof(devSerial));
+                                       if (err < 0) {
+                                               fprintf(stderr, "Can't read serial-number: %s\n", usb_strerror(err));
+                                               libusb_close(devh);
+                                               libusb_free_device_list(list, 1);
+                                               return NULL;
+                                       }
+                                       if (strcmp((char*)devSerial, (char*)serial)) {
+                                               libusb_close(devh);
+                                               continue;
+                                       }
+                               } else {
+                                       libusb_close(devh);
+                                       continue;
+                               }
+                       }
+
                        err = libusb_detach_kernel_driver(devh, INTERFACE);
                        if ((err != 0) && (err != LIBUSB_ERROR_NOT_FOUND)) {
                                fprintf(stderr, "Can't detach kernel driver: %s\n", usb_strerror(err));
+                               libusb_close(devh);
+                               libusb_free_device_list(list, 1);
                                return NULL;
                        }
 
                        err = libusb_claim_interface(devh, INTERFACE);
                        if ((err != 0)) {
                                fprintf(stderr, "Can't claim interface: %s\n", usb_strerror(err));
+                               libusb_close(devh);
+                               libusb_free_device_list(list, 1);
                                return NULL;
                        }
 
+                       libusb_free_device_list(list, 0);
                        return devh;
                }
 
        }
 
+       libusb_free_device_list(list, 1);
        return NULL;
 }
 
-int hmcfgusb_send_null_frame(struct hmcfgusb_dev *usbdev)
+int hmcfgusb_send_null_frame(struct hmcfgusb_dev *usbdev, int silent)
 {
        int err;
        int cnt;
+       unsigned char out[0x40];
 
-       err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, NULL, 0, &cnt, USB_TIMEOUT);
-       if (err) {
-               fprintf(stderr, "Can't send data: %s\n", usb_strerror(err));
+       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;
        }
 
@@ -176,7 +212,7 @@ int hmcfgusb_send(struct hmcfgusb_dev *usbdev, unsigned char* send_data, int len
        }
 
        if (done) {
-               if (!hmcfgusb_send_null_frame(usbdev)) {
+               if (!hmcfgusb_send_null_frame(usbdev, 0)) {
                        return 0;
                }
        }
@@ -193,13 +229,13 @@ int hmcfgusb_send(struct hmcfgusb_dev *usbdev, unsigned char* send_data, int len
        return 1;
 }
 
-static struct libusb_transfer *hmcfgusb_prepare_int(libusb_device_handle *devh, libusb_transfer_cb_fn cb, void *data)
+static struct libusb_transfer *hmcfgusb_prepare_int(libusb_device_handle *devh, libusb_transfer_cb_fn cb, void *data, int in_size)
 {
        unsigned char *data_buf;
        struct libusb_transfer *transfer;
        int err;
 
-       data_buf = malloc(ASYNC_SIZE);
+       data_buf = malloc(in_size);
        if (!data_buf) {
                fprintf(stderr, "Can't allocate memory for data-buffer!\n");
                return NULL;
@@ -213,9 +249,9 @@ static struct libusb_transfer *hmcfgusb_prepare_int(libusb_device_handle *devh,
        }
 
        libusb_fill_interrupt_transfer(transfer, devh, EP_IN,
-                       data_buf, ASYNC_SIZE, cb, data, USB_TIMEOUT);
+                       data_buf, in_size, cb, data, USB_TIMEOUT);
 
-       transfer->flags = LIBUSB_TRANSFER_SHORT_NOT_OK | LIBUSB_TRANSFER_FREE_BUFFER;
+       transfer->flags = LIBUSB_TRANSFER_FREE_BUFFER;
 
        err = libusb_submit_transfer(transfer);
        if (err != 0) {
@@ -242,15 +278,11 @@ 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);
-                       quit = EIO;
+                       if (transfer->status != LIBUSB_TRANSFER_CANCELLED)
+                               fprintf(stderr, "Interrupt transfer not completed: %s!\n", usb_strerror(transfer->status));
 
-                       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;
+                       quit = EIO;
+                       goto out;
                }
        } else {
                if (cb_data && cb_data->cb) {
@@ -259,14 +291,7 @@ static void LIBUSB_CALL hmcfgusb_interrupt(struct libusb_transfer *transfer)
 
                        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;
+                               goto out;
                        }
                } else {
                        hexdump(transfer->buffer, transfer->actual_length, "> ");
@@ -276,46 +301,80 @@ 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));
-               libusb_free_transfer(transfer);
-               cb_data->dev->transfer = NULL;
+               goto out;
+       }
+
+       return;
+
+out:
+       libusb_free_transfer(transfer);
+       if (cb_data) {
+               if (cb_data->dev && cb_data->dev->transfer) {
+                       cb_data->dev->transfer = NULL;
+               }
                free(cb_data);
        }
 }
 
-struct hmcfgusb_dev *hmcfgusb_init(hmcfgusb_cb_fn cb, void *data)
+struct hmcfgusb_dev *hmcfgusb_init(hmcfgusb_cb_fn cb, void *data, char *serial)
 {
        libusb_device_handle *devh = NULL;
        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;
 
-       err = libusb_init(NULL);
-       if (err != 0) {
-               fprintf(stderr, "Can't initialize libusb: %s\n", usb_strerror(err));
-               return NULL;
+       if (!libusb_initialized) {
+               err = libusb_init(NULL);
+               if (err != 0) {
+                       fprintf(stderr, "Can't initialize libusb: %s\n", usb_strerror(err));
+                       return NULL;
+               }
        }
+       libusb_initialized = 1;
 
-       devh = hmcfgusb_find();
+       devh = hmcfgusb_find(ID_VENDOR, ID_PRODUCT, serial);
        if (!devh) {
-               fprintf(stderr, "Can't find/open hmcfgusb!\n");
-               return NULL;
+               devh = hmcfgusb_find(ID_VENDOR, ID_PRODUCT_BL, serial);
+               if (!devh) {
+                       if (serial) {
+                               fprintf(stderr, "Can't find/open HM-CFG-USB with serial %s!\n", serial);
+                       } else {
+                               fprintf(stderr, "Can't find/open HM-CFG-USB!\n");
+                       }
+#ifdef NEED_LIBUSB_EXIT
+                       hmcfgusb_exit();
+#endif
+                       return NULL;
+               }
+               bootloader = 1;
        }
 
        dev = malloc(sizeof(struct hmcfgusb_dev));
        if (!dev) {
                perror("Can't allocate memory for hmcfgusb_dev");
+               libusb_close(devh);
+#ifdef NEED_LIBUSB_EXIT
+               hmcfgusb_exit();
+#endif
                return NULL;
        }
 
        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);
+               libusb_close(devh);
+#ifdef NEED_LIBUSB_EXIT
+               hmcfgusb_exit();
+#endif
                return NULL;
        }
 
@@ -325,19 +384,30 @@ struct hmcfgusb_dev *hmcfgusb_init(hmcfgusb_cb_fn cb, void *data)
        cb_data->cb = cb;
        cb_data->data = data;
 
-       dev->transfer = hmcfgusb_prepare_int(devh, hmcfgusb_interrupt, cb_data);
+       dev->transfer = hmcfgusb_prepare_int(devh, hmcfgusb_interrupt, cb_data, ASYNC_SIZE);
+
        if (!dev->transfer) {
                fprintf(stderr, "Can't prepare async device io!\n");
                free(dev);
                free(cb_data);
+               libusb_close(devh);
+#ifdef NEED_LIBUSB_EXIT
+               hmcfgusb_exit();
+#endif
                return NULL;
        }
 
        usb_pfd = libusb_get_pollfds(NULL);
        if (!usb_pfd) {
                fprintf(stderr, "Can't get FDset from libusb!\n");
+               libusb_cancel_transfer(dev->transfer);
+               libusb_handle_events(NULL);
                free(dev);
                free(cb_data);
+               libusb_close(devh);
+#ifdef NEED_LIBUSB_EXIT
+               hmcfgusb_exit();
+#endif
                return NULL;
        }
 
@@ -348,8 +418,14 @@ 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");
+               libusb_cancel_transfer(dev->transfer);
+               libusb_handle_events(NULL);
                free(dev);
                free(cb_data);
+               libusb_close(devh);
+#ifdef NEED_LIBUSB_EXIT
+               hmcfgusb_exit();
+#endif
                return NULL;
        }
 
@@ -390,6 +466,7 @@ 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;
@@ -405,13 +482,11 @@ int hmcfgusb_poll(struct hmcfgusb_dev *dev, int timeout)
                return -1;
        } else if (err == 0) {
                /* No pending timeout or a sane platform */
-               tv.tv_sec = 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;
+               } else if ((tv.tv_sec * 1000) < timeout) {
+                       timeout = tv.tv_sec * 1000;
                }
        }
 
@@ -420,13 +495,14 @@ int hmcfgusb_poll(struct hmcfgusb_dev *dev, int timeout)
                        dev->pfd[i].revents = 0;
                }
 
-               n = poll(dev->pfd, dev->n_pfd, tv.tv_sec * 1000);
+               n = poll(dev->pfd, dev->n_pfd, timeout);
                if (n < 0) {
                        perror("poll");
                        errno = 0;
                        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) {
@@ -458,15 +534,51 @@ 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_leave_bootloader(struct hmcfgusb_dev *dev)
+{
+       uint8_t out[ASYNC_SIZE];
+
+       if (!dev->bootloader) {
+               fprintf(stderr, "request for leaving bootloader mode, but device already in normal mode!\n");
+               return;
+       }
+
+       memset(out, 0, sizeof(out));
+       out[0] = 'K';
+       hmcfgusb_send(dev, out, sizeof(out), 1);
+
+       return;
+}
+
 void hmcfgusb_close(struct hmcfgusb_dev *dev)
 {
        int err;
 
        if (dev->transfer) {
                libusb_cancel_transfer(dev->transfer);
+               libusb_handle_events(NULL);
        }
 
        err = libusb_release_interface(dev->usb_devh, INTERFACE);
@@ -475,10 +587,19 @@ void hmcfgusb_close(struct hmcfgusb_dev *dev)
        }
 
        libusb_close(dev->usb_devh);
+#ifdef NEED_LIBUSB_EXIT
+       hmcfgusb_exit();
+#endif
        free(dev->pfd);
        free(dev);
+}
 
-       libusb_exit(NULL);
+void hmcfgusb_exit(void)
+{
+       if (libusb_initialized) {
+               libusb_exit(NULL);
+               libusb_initialized = 0;
+       }
 }
 
 void hmcfgusb_set_debug(int d)
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