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-rw-r--r--src/usb/osmo_libusb.c378
1 files changed, 377 insertions, 1 deletions
diff --git a/src/usb/osmo_libusb.c b/src/usb/osmo_libusb.c
index fda95739..5b012b86 100644
--- a/src/usb/osmo_libusb.c
+++ b/src/usb/osmo_libusb.c
@@ -1,6 +1,6 @@
/* libosmocore integration with libusb-1.0
*
- * (C) 2019 by Harald Welte <laforge@gnumonks.org>
+ * (C) 2019-2019 by Harald Welte <laforge@gnumonks.org>
* All Rights Reserved.
*
* SPDX-License-Identifier: GPL-2.0+
@@ -33,6 +33,8 @@
#include <libusb.h>
+#include <osmocom/usb/libusb.h>
+
/***********************************************************************
* logging integration
***********************************************************************/
@@ -104,7 +106,381 @@ static void osmo_usb_removed_cb(int fd, void *user_data)
talloc_free(ofd);
}
+/***********************************************************************
+ * utility functions
+ ***********************************************************************/
+
+/*! obtain the string representation of the USB device path of given device.
+ * \param[out] buf Output string buffer
+ * \param[in] bufsize Size of output string buffer in bytes
+ * \param[in] dev USB device whose bus path we want to obtain
+ * \returns pointer to 'buf' in case of success; NULL in case of error */
+char *osmo_libusb_dev_get_path_buf(char *buf, size_t bufsize, libusb_device *dev)
+{
+#if (defined(LIBUSB_API_VERSION) && LIBUSB_API_VERSION >= 0x01000102) || \
+ (defined(LIBUSBX_API_VERSION) && LIBUSBX_API_VERSION >= 0x01000102)
+ struct osmo_strbuf sb = { .buf = buf, .len = bufsize };
+ uint8_t path[8];
+ int r,j;
+ r = libusb_get_port_numbers(dev, path, sizeof(path));
+ if (r > 0) {
+ OSMO_STRBUF_PRINTF(sb, "%d-%d", libusb_get_bus_number(dev), path[0]);
+ for (j = 1; j < r; j++){
+ OSMO_STRBUF_PRINTF(sb, ".%d", path[j]);
+ }
+ }
+ return buf;
+#else
+# warning "libusb too old - building without USB path support!"
+ return NULL;
+#endif
+}
+
+/*! obtain the string representation of the USB device path of given device.
+ * \param[in] talloc context from which to dynamically allocate output string buffer
+ * \param[in] dev USB device whose bus path we want to obtain
+ * \returns pointer to 'buf' in case of success; NULL in case of error */
+char *osmo_libusb_dev_get_path_c(void *ctx, libusb_device *dev)
+{
+ char *buf = talloc_zero_size(ctx, USB_MAX_PATH_LEN);
+ if (!buf)
+ return NULL;
+ return osmo_libusb_dev_get_path_buf(buf, USB_MAX_PATH_LEN, dev);
+}
+
+static int match_dev_id(const struct libusb_device_descriptor *desc, const struct dev_id *id)
+{
+ if ((desc->idVendor == id->vendor_id) && (desc->idProduct == id->product_id))
+ return 1;
+ return 0;
+}
+
+static int match_dev_ids(const struct libusb_device_descriptor *desc, const struct dev_id *ids)
+{
+ const struct dev_id *id;
+
+ for (id = ids; id->vendor_id || id->product_id; id++) {
+ if (match_dev_id(desc, id))
+ return 1;
+ }
+ return 0;
+}
+
+/*! Find USB devices matching the specified list of USB VendorID/ProductIDs
+ * \param[in] ctx talloc context from which to allocate output data
+ * \param[in] luctx libusb context on which to operate
+ * \param[in] dev_ids zero-terminated array of VendorId/ProductId tuples
+ * \returns array of up to 256 libusb_device pointers; NULL in case of error */
+libusb_device **osmo_libusb_find_matching_usb_devs(void *ctx, struct libusb_context *luctx,
+ const struct dev_id *dev_ids)
+{
+ libusb_device **list;
+ libusb_device **out = talloc_zero_array(ctx, libusb_device *, 256);
+ libusb_device **cur = out;
+ unsigned int i;
+ int rc;
+
+ if (!out)
+ return NULL;
+
+ rc = libusb_get_device_list(luctx, &list);
+ if (rc <= 0) {
+ perror("No USB devices found");
+ talloc_free(out);
+ return NULL;
+ }
+
+ for (i = 0; list[i] != NULL; i++) {
+ struct libusb_device_descriptor dev_desc;
+ libusb_device *dev = list[i];
+
+ rc = libusb_get_device_descriptor(dev, &dev_desc);
+ if (rc < 0) {
+ perror("Couldn't get device descriptor\n");
+ libusb_unref_device(dev);
+ continue;
+ }
+
+ if (match_dev_ids(&dev_desc, dev_ids)) {
+ *cur = dev;
+ cur++;
+ /* overflow check */
+ if (cur >= out + 256)
+ break;
+ } else
+ libusb_unref_device(dev);
+ }
+ if (cur == out) {
+ libusb_free_device_list(list, 1);
+ talloc_free(out);
+ return NULL;
+ }
+
+ libusb_free_device_list(list, 0);
+ return out;
+}
+
+/*! find a matching interface among all interfaces of the given USB device.
+ * \param[in] dev USB device in which we shall search
+ * \param[in] class USB Interface Class to look for
+ * \param[in] sub_class USB Interface Subclass to look for
+ * \param[in] protocol USB Interface Protocol to look for
+ * \param[out] out User-allocated array for storing matches
+ * \param[in] out_len Length of out array
+ * \returns number of matching interfaces; negative in case of error */
+int osmo_libusb_dev_find_matching_interfaces(libusb_device *dev, int class, int sub_class,
+ int protocol, struct usb_interface_match *out,
+ unsigned int out_len)
+{
+ struct libusb_device_descriptor dev_desc;
+ int rc, i, out_idx = 0;
+ uint8_t addr;
+ char pathbuf[USB_MAX_PATH_LEN];
+ char *path;
+
+ rc = libusb_get_device_descriptor(dev, &dev_desc);
+ if (rc < 0) {
+ perror("Couldn't get device descriptor\n");
+ return -EIO;
+ }
+
+ addr = libusb_get_device_address(dev);
+ path = osmo_libusb_dev_get_path_buf(pathbuf, sizeof(pathbuf), dev);
+ /* iterate over all configurations */
+ for (i = 0; i < dev_desc.bNumConfigurations; i++) {
+ struct libusb_config_descriptor *conf_desc;
+ int j;
+
+ rc = libusb_get_config_descriptor(dev, i, &conf_desc);
+ if (rc < 0) {
+ fprintf(stderr, "Couldn't get config descriptor %u\n", i);
+ continue;
+ }
+ /* iterate over all interfaces */
+ for (j = 0; j < conf_desc->bNumInterfaces; j++) {
+ const struct libusb_interface *intf = &conf_desc->interface[j];
+ int k;
+ /* iterate over all alternate settings */
+ for (k = 0; k < intf->num_altsetting; k++) {
+ const struct libusb_interface_descriptor *if_desc;
+ if_desc = &intf->altsetting[k];
+ if (class >= 0 && if_desc->bInterfaceClass != class)
+ continue;
+ if (sub_class >= 0 && if_desc->bInterfaceSubClass != sub_class)
+ continue;
+ if (protocol >= 0 && if_desc->bInterfaceProtocol != protocol)
+ continue;
+ /* MATCH! */
+ out[out_idx].usb_dev = dev;
+ out[out_idx].vendor = dev_desc.idVendor;
+ out[out_idx].product = dev_desc.idProduct;
+ out[out_idx].addr = addr;
+ strncpy(out[out_idx].path, path, sizeof(out[out_idx].path)-1);
+ out[out_idx].path[sizeof(out[out_idx].path)-1] = '\0';
+ out[out_idx].configuration = conf_desc->bConfigurationValue;
+ out[out_idx].interface = if_desc->bInterfaceNumber;
+ out[out_idx].altsetting = if_desc->bAlternateSetting;
+ out[out_idx].class = if_desc->bInterfaceClass;
+ out[out_idx].sub_class = if_desc->bInterfaceSubClass;
+ out[out_idx].protocol = if_desc->bInterfaceProtocol;
+ out[out_idx].string_idx = if_desc->iInterface;
+ out_idx++;
+ if (out_idx >= out_len)
+ return out_idx;
+ }
+ }
+ }
+ return out_idx;
+}
+
+/*! find matching interfaces among a list devices of specified VendorId/ProductID tuples.
+ * \param[in] luctx libusb context on which to operate
+ * \param[in] dev_ids zero-terminated array of VendorId/ProductId tuples
+ * \param[in] class USB Interface Class to look for
+ * \param[in] sub_class USB Interface Subclass to look for
+ * \param[in] protocol USB Interface Protocol to look for
+ * \param[out] out User-allocated array for storing matches
+ * \param[in] out_len Length of out array
+ * \returns number of matching interfaces; negative in case of error */
+int osmo_libusb_find_matching_interfaces(libusb_context *luctx, const struct dev_id *dev_ids,
+ int class, int sub_class, int protocol,
+ struct usb_interface_match *out, unsigned int out_len)
+{
+ struct usb_interface_match *out_cur = out;
+ unsigned int out_len_remain = out_len;
+ libusb_device **list;
+ libusb_device **dev;
+
+ list = osmo_libusb_find_matching_usb_devs(NULL, luctx, dev_ids);
+ if (!list)
+ return 0;
+
+ for (dev = list; *dev; dev++) {
+ int rc;
+
+#if 0
+ struct libusb_device_descriptor dev_desc;
+ uint8_t ports[8];
+ uint8_t addr;
+ rc = libusb_get_device_descriptor(*dev, &dev_desc);
+ if (rc < 0) {
+ perror("Cannot get device descriptor");
+ continue;
+ }
+
+ addr = libusb_get_device_address(*dev);
+
+ rc = libusb_get_port_numbers(*dev, ports, sizeof(ports));
+ if (rc < 0) {
+ perror("Cannot get device path");
+ continue;
+ }
+
+ printf("Found USB Device %04x:%04x at address %d\n",
+ dev_desc.idVendor, dev_desc.idProduct, addr);
+#endif
+
+ rc = osmo_libusb_dev_find_matching_interfaces(*dev, class, sub_class,
+ protocol, out_cur, out_len_remain);
+ if (rc < 0)
+ continue;
+ out_cur += rc;
+ out_len_remain -= rc;
+
+ }
+
+ /* unref / free list */
+ for (dev = list; *dev; dev++)
+ libusb_unref_device(*dev);
+ talloc_free(list);
+
+ return out_len - out_len_remain;
+}
+
+/*! open matching USB device and claim interface
+ * \param[in] ctx talloc context to use for related allocations
+ * \param[in] luctx libusb context on which to operate
+ * \param[in] ifm interface match describing interface to claim
+ * \returns libusb device chandle on success; NULL on error */
+libusb_device_handle *osmo_libusb_open_claim_interface(void *ctx, libusb_context *luctx,
+ const struct usb_interface_match *ifm)
+{
+ int rc, config;
+ struct dev_id dev_ids[] = { { ifm->vendor, ifm->product }, { 0, 0 } };
+ libusb_device **list;
+ libusb_device **dev;
+ libusb_device_handle *usb_devh = NULL;
+
+ list = osmo_libusb_find_matching_usb_devs(ctx, luctx, dev_ids);
+ if (!list) {
+ perror("No USB device with matching VID/PID");
+ return NULL;
+ }
+
+ for (dev = list; *dev; dev++) {
+ int addr;
+ char pathbuf[USB_MAX_PATH_LEN];
+ char *path;
+
+ addr = libusb_get_device_address(*dev);
+ path = osmo_libusb_dev_get_path_buf(pathbuf, sizeof(pathbuf), *dev);
+ if ((ifm->addr && addr == ifm->addr) ||
+ (strlen(ifm->path) && !strcmp(path, ifm->path))) {
+ rc = libusb_open(*dev, &usb_devh);
+ if (rc < 0) {
+ fprintf(stderr, "Cannot open device: %s\n", libusb_error_name(rc));
+ usb_devh = NULL;
+ break;
+ }
+ rc = libusb_get_configuration(usb_devh, &config);
+ if (rc < 0) {
+ fprintf(stderr, "Cannot get current configuration: %s\n", libusb_error_name(rc));
+ libusb_close(usb_devh);
+ usb_devh = NULL;
+ break;
+ }
+ if (config != ifm->configuration) {
+ rc = libusb_set_configuration(usb_devh, ifm->configuration);
+ if (rc < 0) {
+ fprintf(stderr, "Cannot set configuration: %s\n", libusb_error_name(rc));
+ libusb_close(usb_devh);
+ usb_devh = NULL;
+ break;
+ }
+ }
+ rc = libusb_claim_interface(usb_devh, ifm->interface);
+ if (rc < 0) {
+ fprintf(stderr, "Cannot claim interface: %s\n", libusb_error_name(rc));
+ libusb_close(usb_devh);
+ usb_devh = NULL;
+ break;
+ }
+ rc = libusb_set_interface_alt_setting(usb_devh, ifm->interface, ifm->altsetting);
+ if (rc < 0) {
+ fprintf(stderr, "Cannot set interface altsetting: %s\n", libusb_error_name(rc));
+ libusb_release_interface(usb_devh, ifm->interface);
+ libusb_close(usb_devh);
+ usb_devh = NULL;
+ break;
+ }
+ }
+ }
+
+ /* unref / free list */
+ for (dev = list; *dev; dev++)
+ libusb_unref_device(*dev);
+ talloc_free(list);
+
+ return usb_devh;
+}
+
+/*! obtain the endpoint addresses for a given USB interface.
+ * \param[in] devh USB device handle on which to operate
+ * \param[in] if_num USB Interface number on which to operate
+ * \param[out] out user-provided storage for OUT endpoint number
+ * \param[out] in user-provided storage for IN endpoint number
+ * \param[out] irq user-provided storage for IRQ endpoint number
+ * \returns 0 in case of success; negative in case of error */
+int osmo_libusb_get_ep_addrs(libusb_device_handle *devh, unsigned int if_num,
+ uint8_t *out, uint8_t *in, uint8_t *irq)
+{
+ libusb_device *dev = libusb_get_device(devh);
+ struct libusb_config_descriptor *cdesc;
+ const struct libusb_interface_descriptor *idesc;
+ const struct libusb_interface *iface;
+ int rc, l;
+
+ rc = libusb_get_active_config_descriptor(dev, &cdesc);
+ if (rc < 0)
+ return rc;
+
+ iface = &cdesc->interface[if_num];
+ /* FIXME: we assume there's no altsetting */
+ idesc = &iface->altsetting[0];
+
+ for (l = 0; l < idesc->bNumEndpoints; l++) {
+ const struct libusb_endpoint_descriptor *edesc = &idesc->endpoint[l];
+ switch (edesc->bmAttributes & 3) {
+ case LIBUSB_TRANSFER_TYPE_BULK:
+ if (edesc->bEndpointAddress & 0x80) {
+ if (in)
+ *in = edesc->bEndpointAddress;
+ } else {
+ if (out)
+ *out = edesc->bEndpointAddress;
+ }
+ break;
+ case LIBUSB_TRANSFER_TYPE_INTERRUPT:
+ if (irq)
+ *irq = edesc->bEndpointAddress;
+ break;
+ default:
+ break;
+ }
+ }
+ return 0;
+}
/***********************************************************************
* initialization
***********************************************************************/