+ dev->transfer = libusb_alloc_transfer(0);
+ if (dev->transfer == NULL) {
+ error(dev->ctx, "cannot allocate transfer (%s)\n",
+ strerror(errno));
+ return -ENOMEM;
+ }
+
+ /* Make a copy of the buffer so the caller can safely reuse it just
+ * after libusb_submit_transfer() has returned. This technique
+ * requires more allocations than a proper double-buffering approach
+ * but it takes a lot less code. */
+ transfer_buffer = malloc(len);
+ if (transfer_buffer == NULL) {
+ error(dev->ctx, "cannot allocate transfer buffer (%s)\n",
+ strerror(errno));
+ ret = -ENOMEM;
+ goto err;
+ }
+ memcpy(transfer_buffer, buffer, len);
+
+ dev->transfer->flags |= LIBUSB_TRANSFER_FREE_BUFFER;
+ libusb_fill_bulk_transfer(dev->transfer, dev->usb_device, 0x1,
+ transfer_buffer, len,
+ send_data_async_complete_cb, dev, 0);
+
+ /* wait for the previous transfer to complete */
+ wait_for_trasfer_completed(dev);
+
+ trace_dump_buffer(dev->ctx, "sending -->", buffer, len);
+
+ dev->transfer_completed = 0;
+ ret = libusb_submit_transfer(dev->transfer);
+ if (ret < 0)
+ goto err;
+
+ return 0;
+
+err:
+ libusb_free_transfer(dev->transfer);
+ dev->transfer = NULL;
+ return ret;
+}
+
+static void serialize_header(struct am7xxx_header *h, uint8_t *buffer)
+{
+ uint8_t **buffer_iterator = &buffer;
+
+ put_le32(h->packet_type, buffer_iterator);
+ put_8(h->direction, buffer_iterator);
+ put_8(h->header_data_len, buffer_iterator);
+ put_8(h->unknown2, buffer_iterator);
+ put_8(h->unknown3, buffer_iterator);
+ put_le32(h->header_data.data.field0, buffer_iterator);
+ put_le32(h->header_data.data.field1, buffer_iterator);
+ put_le32(h->header_data.data.field2, buffer_iterator);
+ put_le32(h->header_data.data.field3, buffer_iterator);
+}
+
+static void unserialize_header(uint8_t *buffer, struct am7xxx_header *h)
+{
+ uint8_t **buffer_iterator = &buffer;
+
+ h->packet_type = get_le32(buffer_iterator);
+ h->direction = get_8(buffer_iterator);
+ h->header_data_len = get_8(buffer_iterator);
+ h->unknown2 = get_8(buffer_iterator);
+ h->unknown3 = get_8(buffer_iterator);
+ h->header_data.data.field0 = get_le32(buffer_iterator);
+ h->header_data.data.field1 = get_le32(buffer_iterator);
+ h->header_data.data.field2 = get_le32(buffer_iterator);
+ h->header_data.data.field3 = get_le32(buffer_iterator);
+}
+
+static int read_header(am7xxx_device *dev, struct am7xxx_header *h)
+{
+ int ret;
+
+ ret = read_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
+ if (ret < 0)
+ goto out;
+
+ unserialize_header(dev->buffer, h);
+
+ if (h->direction == AM7XXX_DIRECTION_IN) {
+ ret = 0;
+ } else {
+ error(dev->ctx,
+ "Expected an AM7XXX_DIRECTION_IN packet, got one with direction = %d. Weird!\n",
+ h->direction);
+ ret = -EINVAL;
+ }
+
+ debug_dump_header(dev->ctx, h);
+
+out:
+ return ret;
+}
+
+static int send_header(am7xxx_device *dev, struct am7xxx_header *h)
+{
+ int ret;
+
+ debug_dump_header(dev->ctx, h);
+
+ /* For symmetry with read_header() we should check here for
+ * h->direction == AM7XXX_DIRECTION_OUT but we just ensure that in all
+ * the callers and save some cycles here.
+ */
+
+ serialize_header(h, dev->buffer);
+
+ ret = send_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
+ if (ret < 0)
+ error(dev->ctx, "failed to send data\n");
+
+ return ret;
+}
+
+/* When level == AM7XXX_LOG_FATAL do not check the log_level from the context
+ * and print the message unconditionally, this makes it possible to print
+ * fatal messages even early on initialization, before the context has been
+ * set up */
+static void log_message(am7xxx_context *ctx,
+ int level,
+ const char *function,
+ int line,
+ const char *fmt,
+ ...)
+{
+ va_list ap;
+
+ if (level == AM7XXX_LOG_FATAL || (ctx && level <= ctx->log_level)) {
+ if (function) {
+ fprintf(stderr, "%s", function);
+ if (line)
+ fprintf(stderr, "[%d]", line);
+ fprintf(stderr, ": ");
+ }
+
+ va_start(ap, fmt);
+ vfprintf(stderr, fmt, ap);
+ va_end(ap);
+ }
+
+ return;
+}
+
+static am7xxx_device *add_new_device(am7xxx_context *ctx,
+ const struct am7xxx_usb_device_descriptor *desc)
+{
+ am7xxx_device **devices_list;
+ am7xxx_device *new_device;
+
+ if (ctx == NULL) {
+ fatal("context must not be NULL!\n");
+ return NULL;
+ }
+
+ new_device = malloc(sizeof(*new_device));
+ if (new_device == NULL) {
+ fatal("cannot allocate a new device (%s)\n", strerror(errno));
+ return NULL;
+ }
+ memset(new_device, 0, sizeof(*new_device));
+
+ new_device->ctx = ctx;
+ new_device->desc = desc;
+ new_device->transfer_completed = 1;
+
+ devices_list = &(ctx->devices_list);
+
+ if (*devices_list == NULL) {
+ *devices_list = new_device;
+ } else {
+ am7xxx_device *prev = *devices_list;
+ while (prev->next)
+ prev = prev->next;
+ prev->next = new_device;
+ }
+ return new_device;
+}
+
+static am7xxx_device *find_device(am7xxx_context *ctx,
+ unsigned int device_index)
+{
+ unsigned int i = 0;
+ am7xxx_device *current;
+
+ if (ctx == NULL) {
+ fatal("context must not be NULL!\n");
+ return NULL;
+ }
+
+ current = ctx->devices_list;
+ while (current && i++ < device_index)
+ current = current->next;
+
+ return current;
+}
+
+typedef enum {
+ SCAN_OP_BUILD_DEVLIST,
+ SCAN_OP_OPEN_DEVICE,
+} scan_op;
+
+/**
+ * This is where the central logic of multi-device support is.
+ *
+ * When 'op' == SCAN_OP_BUILD_DEVLIST the parameters 'open_device_index' and
+ * 'dev' are ignored; the function returns 0 on success and a negative value
+ * on error.
+ *
+ * When 'op' == SCAN_OP_OPEN_DEVICE the function opens the supported USB
+ * device with index 'open_device_index' and returns the correspondent
+ * am7xxx_device in the 'dev' parameter; the function returns 0 on success,
+ * 1 if the device was already open and a negative value on error.
+ *
+ * NOTES:
+ * if scan_devices() fails when called with 'op' == SCAN_OP_BUILD_DEVLIST,
+ * the caller might want to call am7xxx_shutdown() in order to remove
+ * devices possibly added before the failure.
+ */
+static int scan_devices(am7xxx_context *ctx, scan_op op,
+ unsigned int open_device_index, am7xxx_device **dev)
+{
+ ssize_t num_devices;
+ libusb_device** list;
+ unsigned int current_index;
+ int i;
+ int ret;
+
+ if (ctx == NULL) {
+ fatal("context must not be NULL!\n");
+ return -EINVAL;
+ }
+ if (op == SCAN_OP_BUILD_DEVLIST && ctx->devices_list != NULL) {
+ error(ctx, "device scan done already? Abort!\n");
+ return -EINVAL;
+ }
+
+ num_devices = libusb_get_device_list(ctx->usb_context, &list);
+ if (num_devices < 0) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ current_index = 0;
+ for (i = 0; i < num_devices; i++) {
+ struct libusb_device_descriptor desc;
+ unsigned int j;
+
+ ret = libusb_get_device_descriptor(list[i], &desc);
+ if (ret < 0)
+ continue;
+
+ for (j = 0; j < ARRAY_SIZE(supported_devices); j++) {
+ if (desc.idVendor == supported_devices[j].vendor_id &&
+ desc.idProduct == supported_devices[j].product_id) {
+
+ if (op == SCAN_OP_BUILD_DEVLIST) {
+ am7xxx_device *new_device;
+ info(ctx, "am7xxx device found, index: %d, name: %s\n",
+ current_index,
+ supported_devices[j].name);
+ new_device = add_new_device(ctx, &supported_devices[j]);
+ if (new_device == NULL) {
+ /* XXX, the caller may want
+ * to call am7xxx_shutdown() if
+ * we fail here, as we may have
+ * added some devices already
+ */
+ debug(ctx, "Cannot create a new device\n");
+ ret = -ENODEV;
+ goto out;
+ }
+ } else if (op == SCAN_OP_OPEN_DEVICE &&
+ current_index == open_device_index) {
+
+ *dev = find_device(ctx, open_device_index);
+ if (*dev == NULL) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ /* the usb device has already been opened */
+ if ((*dev)->usb_device) {
+ debug(ctx, "(*dev)->usb_device already set\n");
+ ret = 1;
+ goto out;
+ }
+
+ ret = libusb_open(list[i], &((*dev)->usb_device));
+ if (ret < 0) {
+ debug(ctx, "libusb_open failed\n");
+ goto out;
+ }
+
+ /* XXX, the device is now open, if any
+ * of the calls below fail we need to
+ * close it again before bailing out.
+ */
+
+ ret = libusb_set_configuration((*dev)->usb_device,
+ (*dev)->desc->configuration);
+ if (ret < 0) {
+ debug(ctx, "libusb_set_configuration failed\n");
+ debug(ctx, "Cannot set configuration %hhu\n",
+ (*dev)->desc->configuration);
+ goto out_libusb_close;
+ }
+
+ ret = libusb_claim_interface((*dev)->usb_device,
+ (*dev)->desc->interface_number);
+ if (ret < 0) {
+ debug(ctx, "libusb_claim_interface failed\n");
+ debug(ctx, "Cannot claim interface %hhu\n",
+ (*dev)->desc->interface_number);
+out_libusb_close:
+ libusb_close((*dev)->usb_device);
+ (*dev)->usb_device = NULL;
+ goto out;
+ }
+
+ goto out;
+ }
+ current_index++;
+ }
+ }
+ }
+
+ /* if we made it up to here we didn't find any device to open */
+ if (op == SCAN_OP_OPEN_DEVICE) {
+ error(ctx, "Cannot find any device to open\n");
+ ret = -ENODEV;
+ goto out;
+ }
+
+ /* everything went fine when building the device list */
+ ret = 0;
+out:
+ libusb_free_device_list(list, 1);
+ return ret;
+}
+
+/* Public API */
+
+AM7XXX_PUBLIC int am7xxx_init(am7xxx_context **ctx)
+{
+ int ret;
+
+ *ctx = malloc(sizeof(**ctx));
+ if (*ctx == NULL) {
+ fatal("cannot allocate the context (%s)\n", strerror(errno));
+ ret = -ENOMEM;
+ goto out;
+ }
+ memset(*ctx, 0, sizeof(**ctx));
+
+ /* Set the highest log level during initialization */
+ (*ctx)->log_level = AM7XXX_LOG_TRACE;
+
+ ret = libusb_init(&((*ctx)->usb_context));
+ if (ret < 0)
+ goto out_free_context;
+
+ libusb_set_debug((*ctx)->usb_context, LIBUSB_LOG_LEVEL_INFO);
+
+ ret = scan_devices(*ctx, SCAN_OP_BUILD_DEVLIST , 0, NULL);
+ if (ret < 0) {
+ error(*ctx, "scan_devices() failed\n");
+ am7xxx_shutdown(*ctx);
+ goto out;
+ }
+
+ /* Set a quieter log level as default for normal operation */
+ (*ctx)->log_level = AM7XXX_LOG_ERROR;
+ return 0;
+
+out_free_context:
+ free(*ctx);
+ *ctx = NULL;
+out:
+ return ret;
+}
+
+AM7XXX_PUBLIC void am7xxx_shutdown(am7xxx_context *ctx)
+{
+ am7xxx_device *current;
+
+ if (ctx == NULL) {
+ fatal("context must not be NULL!\n");
+ return;
+ }
+
+ current = ctx->devices_list;
+ while (current) {
+ am7xxx_device *next = current->next;
+ am7xxx_close_device(current);
+ free(current->device_info);
+ free(current);
+ current = next;
+ }
+
+ libusb_exit(ctx->usb_context);
+ free(ctx);
+ ctx = NULL;
+}
+
+AM7XXX_PUBLIC void am7xxx_set_log_level(am7xxx_context *ctx, am7xxx_log_level log_level)
+{
+ ctx->log_level = log_level;
+}
+
+AM7XXX_PUBLIC int am7xxx_open_device(am7xxx_context *ctx, am7xxx_device **dev,
+ unsigned int device_index)
+{
+ int ret;
+
+ if (ctx == NULL) {
+ fatal("context must not be NULL!\n");
+ return -EINVAL;
+ }
+
+ ret = scan_devices(ctx, SCAN_OP_OPEN_DEVICE, device_index, dev);
+ if (ret < 0) {
projects / libam7xxx.git / blobdiff