laforge has submitted this change. (
https://gerrit.osmocom.org/c/libosmocore/+/16928 )
Change subject: usb: Add osmo_libusb_find_open_claim() all-in-one API
......................................................................
usb: Add osmo_libusb_find_open_claim() all-in-one API
This function offers the highest level of API among all libosmousb
helper functions. It is intended as a one-stop shop for everything
related to grabbing an interface.
Change-Id: I748ded6cc7b73a73625588bd7a34a017a905b6bf
---
M include/osmocom/usb/libusb.h
M src/usb/osmo_libusb.c
2 files changed, 126 insertions(+), 0 deletions(-)
Approvals:
laforge: Looks good to me, approved
pespin: Looks good to me, but someone else must approve
Jenkins Builder: Verified
diff --git a/include/osmocom/usb/libusb.h b/include/osmocom/usb/libusb.h
index 2220e03..9ad3f71 100644
--- a/include/osmocom/usb/libusb.h
+++ b/include/osmocom/usb/libusb.h
@@ -55,6 +55,31 @@
uint8_t string_idx;
};
+/*! Description of the USB device+interface we're looking for */
+struct osmo_usb_matchspec {
+ /*! specify the USB device */
+ struct {
+ int vendor_id; /*!< typically -1 for compile time defaults */
+ int product_id; /*!< typically -1 for compile time defaults */
+ char *path; /*!< used for disambiguation when multiple
matches; can be NULL */
+ } dev;
+
+ /*! specify the USB configuration */
+ int config_id; /*!< typically -1 unless user selects specific
configuration */
+
+ /*! specify the USB interface */
+ struct {
+ /* typically those three are set to application defaults */
+ int class; /*!< -1 or a user-specified class */
+ int subclass; /*!< -1 or a user-specified subclass */
+ int proto; /*!< -1 or a user-specified protocol */
+
+ /* typically those two are -1; but user can override them */
+ int num;
+ int altsetting;
+ } intf;
+};
+
char *osmo_libusb_dev_get_path_buf(char *buf, size_t bufsize, libusb_device
*dev);
char *osmo_libusb_dev_get_path_c(void *ctx, libusb_device *dev);
@@ -81,6 +106,11 @@
libusb_device_handle *osmo_libusb_open_claim_interface(void *ctx,
libusb_context *luctx,
const struct
usb_interface_match *ifm);
+void osmo_libusb_match_init(struct osmo_usb_matchspec *cfg, int if_class, int
if_subclass, int if_proto);
+
+libusb_device_handle *osmo_libusb_find_open_claim(const struct
osmo_usb_matchspec *cfg,
+ const struct dev_id
*default_dev_ids);
+
int osmo_libusb_get_ep_addrs(libusb_device_handle *devh, unsigned int if_num,
uint8_t *out, uint8_t *in, uint8_t *irq);
diff --git a/src/usb/osmo_libusb.c b/src/usb/osmo_libusb.c
index 3c8a22a..bb86206 100644
--- a/src/usb/osmo_libusb.c
+++ b/src/usb/osmo_libusb.c
@@ -590,6 +590,102 @@
return usb_devh;
}
+void osmo_libusb_match_init(struct osmo_usb_matchspec *cfg, int if_class, int
if_subclass, int if_proto)
+{
+ cfg->dev.vendor_id = -1;
+ cfg->dev.product_id = -1;
+ cfg->dev.path = NULL;
+
+ cfg->config_id = -1;
+
+ cfg->intf.class = if_class;
+ cfg->intf.subclass = if_subclass;
+ cfg->intf.proto = if_proto;
+
+ cfg->intf.num = cfg->intf.altsetting = -1;
+}
+
+
+/*! high-level all-in-one function for USB device, config + interface matching
+ opening.
+ * This function offers the highest level of API among all libosmousb helper
functions. It
+ * is intended as a one-stop shop for everything related to grabbing an
interface.
+ *
+ * 1) looks for a device matching either the VID/PID from 'cfg' or
'default_dev_ids',
+ * if more than one is found, the user is expected to fill in
cfg->dev.path to disambiguate.
+ * 2) find any interfaces on the device that match the specification in
'cfg'. The match
+ * could be done based on any of (class, subclass, proto, interface
number). If there
+ * are multiple matches, the caller must disambiguate by specifying the
interface number.
+ * 3) open the USB device; set the configuration (if needed); claim the
interface and set
+ * the altsetting
+ *
+ * \param[in] cfg user-supplied match configuration (from command line or
config file)
+ * \param[in] default_dev_ids Default list of supported VendorId/ProductIds
+ * \returns libusb_device_handle on success, NULL on error
+ */
+libusb_device_handle *osmo_libusb_find_open_claim(const struct
osmo_usb_matchspec *cfg,
+ const struct dev_id
*default_dev_ids)
+{
+ struct usb_interface_match if_matches[16];
+ struct usb_interface_match *ifm = NULL;
+ libusb_device_handle *usb_devh = NULL;
+ struct dev_id user_dev_ids[2] = {
+ { cfg->dev.vendor_id, cfg->dev.product_id },
+ { 0, 0 }
+ };
+ const struct dev_id *dev_ids = default_dev_ids;
+ libusb_device *dev;
+ int rc, i;
+
+ /* Stage 1: Find a device matching either the user-specified VID/PID or
+ * the list of IDs in default_dev_ids plus optionally the
user-specified path */
+ if (cfg->dev.vendor_id != -1 || cfg->dev.product_id != -1)
+ dev_ids = user_dev_ids;
+ dev = osmo_libusb_find_matching_dev_path(NULL, dev_ids, cfg->dev.path);
+ if (!dev)
+ goto close_exit;
+
+ /* Stage 2: Find any interfaces matching the class/subclass/proto as
specified */
+ rc = osmo_libusb_dev_find_matching_interfaces(dev, cfg->intf.class,
cfg->intf.subclass,
+ cfg->intf.proto,
if_matches, sizeof(if_matches));
+ if (rc < 1) {
+ LOGP(DLUSB, LOGL_NOTICE, "can't find matching USB interface at
device\n");
+ goto close_exit;
+ } else if (rc == 1) {
+ ifm = if_matches;
+ } else if (rc > 1) {
+ if (cfg->intf.num == -1) {
+ LOGP(DLUSB, LOGL_ERROR, "Found %d matching USB
interfaces, you "
+ "have to specify the interface number\n", rc);
+ goto close_exit;
+ }
+ for (i = 0; i < rc; i++) {
+ if (if_matches[i].interface == cfg->intf.num) {
+ ifm = &if_matches[i];
+ break;
+ }
+ /* FIXME: match altsetting */
+ }
+ }
+ if (!ifm) {
+ LOGP(DLUSB, LOGL_NOTICE, "Couldn't find matching interface\n");
+ goto close_exit;
+ }
+
+ /* Stage 3: Open device; set config (if required); claim interface; set
altsetting */
+ usb_devh = osmo_libusb_open_claim_interface(NULL, NULL, ifm);
+ if (!usb_devh) {
+ LOGP(DLUSB, LOGL_ERROR, "can't open USB device (permissions
issue?)\n");
+ goto close_exit;
+ }
+ return usb_devh;
+close_exit:
+ /* release if_matches */
+ if (usb_devh)
+ libusb_close(usb_devh);
+
+ return NULL;
+}
+
/*! 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
--
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Gerrit-Project: libosmocore
Gerrit-Branch: master
Gerrit-Change-Id: I748ded6cc7b73a73625588bd7a34a017a905b6bf
Gerrit-Change-Number: 16928
Gerrit-PatchSet: 5
Gerrit-Owner: laforge <[email protected]>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: laforge <[email protected]>
Gerrit-Reviewer: pespin <[email protected]>
Gerrit-CC: fixeria <[email protected]>
Gerrit-MessageType: merged
