Changeset 26d46d2 in mainline for uspace/lib/usb/src/devdrv.c

Timestamp:

2011-04-10T22:33:27Z (13 years ago)

Author:

Jan Vesely <jano.vesely@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

1a46610, fd153d3

Parents:

c6fe469 (diff), c7bdfa7 (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.

Message:

Development branch changes

File:

• uspace/lib/usb/src/devdrv.c (modified) (10 diffs)

uspace/lib/usb/src/devdrv.c

@@ -100 +100 @@
     usb_device_t *dev, int alternate_setting)
 {
+        if (endpoints == NULL) {
+                dev->pipes = NULL;
+                dev->pipes_count = 0;
+                return EOK;
+        }
+
         usb_endpoint_mapping_t *pipes;
         size_t pipes_count;
@@ -109 +115 @@
 
         if (rc != EOK) {
-                usb_log_error(
-                    "Failed to create endpoint pipes for `%s': %s.\n",
-                    dev->ddf_dev->name, str_error(rc));
                 return rc;
         }
@@ -117 +120 @@
         dev->pipes = pipes;
         dev->pipes_count = pipes_count;
-
-        return EOK;
-}
-
-/** Initialize all endpoint pipes.
- *
- * @param drv The driver.
- * @param dev The device to be initialized.
- * @return Error code.
- */
-static int initialize_pipes(usb_device_t *dev)
-{
-        int rc;
-
-        rc = usb_device_connection_initialize_from_device(&dev->wire,
-            dev->ddf_dev);
-        if (rc != EOK) {
-                usb_log_error(
-                    "Failed initializing connection on device `%s'. %s.\n",
-                    dev->ddf_dev->name, str_error(rc));
-                return rc;
-        }
-
-        rc = usb_pipe_initialize_default_control(&dev->ctrl_pipe,
-            &dev->wire);
-        if (rc != EOK) {
-                usb_log_error("Failed to initialize default control pipe " \
-                    "on device `%s': %s.\n",
-                    dev->ddf_dev->name, str_error(rc));
-                return rc;
-        }
-
-        rc = usb_pipe_probe_default_control(&dev->ctrl_pipe);
-        if (rc != EOK) {
-                usb_log_error(
-                    "Probing default control pipe on device `%s' failed: %s.\n",
-                    dev->ddf_dev->name, str_error(rc));
-                return rc;
-        }
-
-        /* Get our interface. */
-        dev->interface_no = usb_device_get_assigned_interface(dev->ddf_dev);
-
-        /*
-         * We will do some querying of the device, it is worth to prepare
-         * the long transfer.
-         */
-        rc = usb_pipe_start_long_transfer(&dev->ctrl_pipe);
-        if (rc != EOK) {
-                usb_log_error("Failed to start transfer: %s.\n",
-                    str_error(rc));
-                return rc;
-        }
-
-        /* Retrieve the descriptors. */
-        rc = usb_device_retrieve_descriptors(&dev->ctrl_pipe,
-            &dev->descriptors);
-        if (rc != EOK) {
-                usb_log_error("Failed to retrieve standard device " \
-                    "descriptors of %s: %s.\n",
-                    dev->ddf_dev->name, str_error(rc));
-                return rc;
-        }
-
-
-        if (driver->endpoints != NULL) {
-                rc = initialize_other_pipes(driver->endpoints, dev, 0);
-        }
-
-        usb_pipe_end_long_transfer(&dev->ctrl_pipe);
-
-        /* Rollback actions. */
-        if (rc != EOK) {
-                if (dev->descriptors.configuration != NULL) {
-                        free(dev->descriptors.configuration);
-                }
-        }
-
-        return rc;
-}
-
-/** Count number of alternate settings of a interface.
- *
- * @param config_descr Full configuration descriptor.
- * @param config_descr_size Size of @p config_descr in bytes.
- * @param interface_no Interface number.
- * @return Number of alternate interfaces for @p interface_no interface.
- */
-size_t usb_interface_count_alternates(uint8_t *config_descr,
-    size_t config_descr_size, uint8_t interface_no)
-{
-        assert(config_descr != NULL);
-        assert(config_descr_size > 0);
-
-        usb_dp_parser_t dp_parser = {
-                .nesting = usb_dp_standard_descriptor_nesting
-        };
-        usb_dp_parser_data_t dp_data = {
-                .data = config_descr,
-                .size = config_descr_size,
-                .arg = NULL
-        };
-
-        size_t alternate_count = 0;
-
-        uint8_t *iface_ptr = usb_dp_get_nested_descriptor(&dp_parser,
-            &dp_data, config_descr);
-        while (iface_ptr != NULL) {
-                usb_standard_interface_descriptor_t *iface
-                    = (usb_standard_interface_descriptor_t *) iface_ptr;
-                if (iface->descriptor_type == USB_DESCTYPE_INTERFACE) {
-                        if (iface->interface_number == interface_no) {
-                                alternate_count++;
-                        }
-                }
-                iface_ptr = usb_dp_get_sibling_descriptor(&dp_parser, &dp_data,
-                    config_descr, iface_ptr);
-        }
-
-        return alternate_count;
-}
-
-/** Initialize structures related to alternate interfaces.
- *
- * @param dev Device where alternate settings shall be initialized.
- * @return Error code.
- */
-static int initialize_alternate_interfaces(usb_device_t *dev)
-{
-        if (dev->interface_no < 0) {
-                dev->alternate_interfaces = NULL;
-                return EOK;
-        }
-
-        usb_alternate_interfaces_t *alternates
-            = malloc(sizeof(usb_alternate_interfaces_t));
-
-        if (alternates == NULL) {
-                return ENOMEM;
-        }
-
-        alternates->alternative_count
-            = usb_interface_count_alternates(dev->descriptors.configuration,
-            dev->descriptors.configuration_size, dev->interface_no);
-
-        if (alternates->alternative_count == 0) {
-                free(alternates);
-                return ENOENT;
-        }
-
-        alternates->alternatives = malloc(alternates->alternative_count
-            * sizeof(usb_alternate_interface_descriptors_t));
-        if (alternates->alternatives == NULL) {
-                free(alternates);
-                return ENOMEM;
-        }
-
-        alternates->current = 0;
-
-        usb_dp_parser_t dp_parser = {
-                .nesting = usb_dp_standard_descriptor_nesting
-        };
-        usb_dp_parser_data_t dp_data = {
-                .data = dev->descriptors.configuration,
-                .size = dev->descriptors.configuration_size,
-                .arg = NULL
-        };
-
-        usb_alternate_interface_descriptors_t *cur_alt_iface
-            = &alternates->alternatives[0];
-
-        uint8_t *iface_ptr = usb_dp_get_nested_descriptor(&dp_parser,
-            &dp_data, dp_data.data);
-        while (iface_ptr != NULL) {
-                usb_standard_interface_descriptor_t *iface
-                    = (usb_standard_interface_descriptor_t *) iface_ptr;
-                if ((iface->descriptor_type != USB_DESCTYPE_INTERFACE)
-                    || (iface->interface_number != dev->interface_no)) {
-                        iface_ptr = usb_dp_get_sibling_descriptor(&dp_parser,
-                            &dp_data,
-                            dp_data.data, iface_ptr);
-                        continue;
-                }
-
-                cur_alt_iface->interface = iface;
-                cur_alt_iface->nested_descriptors = iface_ptr + sizeof(*iface);
-
-                /* Find next interface to count size of nested descriptors. */
-                iface_ptr = usb_dp_get_sibling_descriptor(&dp_parser, &dp_data,
-                    dp_data.data, iface_ptr);
-                if (iface_ptr == NULL) {
-                        uint8_t *next = dp_data.data + dp_data.size;
-                        cur_alt_iface->nested_descriptors_size
-                            = next - cur_alt_iface->nested_descriptors;
-                } else {
-                        cur_alt_iface->nested_descriptors_size
-                            = iface_ptr - cur_alt_iface->nested_descriptors;
-                }
-
-                cur_alt_iface++;
-        }
-
-        dev->alternate_interfaces = alternates;
 
         return EOK;
@@ -339 +139 @@
         int rc;
 
-        usb_device_t *dev = malloc(sizeof(usb_device_t));
-        if (dev == NULL) {
-                usb_log_error("Out of memory when adding device `%s'.\n",
-                    gen_dev->name);
-                return ENOMEM;
-        }
-
-
-        dev->ddf_dev = gen_dev;
-        dev->ddf_dev->driver_data = dev;
-        dev->driver_data = NULL;
-        dev->descriptors.configuration = NULL;
-
-        dev->pipes_count = 0;
-        dev->pipes = NULL;
-
-        rc = initialize_pipes(dev);
-        if (rc != EOK) {
-                free(dev);
-                return rc;
-        }
-
-        (void) initialize_alternate_interfaces(dev);
+        usb_device_t *dev = NULL;
+        const char *err_msg = NULL;
+        rc = usb_device_create(gen_dev, driver->endpoints, &dev, &err_msg);
+        if (rc != EOK) {
+                usb_log_error("USB device `%s' creation failed (%s): %s.\n",
+                    gen_dev->name, err_msg, str_error(rc));
+                return rc;
+        }
 
         return driver->ops->add_device(dev);
@@ -395 +180 @@
  * with usb_pipe_initialize_from_configuration().
  *
+ * @warning This is a wrapper function that does several operations that
+ * can fail and that cannot be rollbacked easily. That means that a failure
+ * during the SET_INTERFACE request would result in having a device with
+ * no pipes at all (except the default control one). That is because the old
+ * pipes needs to be unregistered at HC first and the new ones could not
+ * be created.
+ *
  * @param dev USB device.
  * @param alternate_setting Alternate setting to choose.
@@ -409 +201 @@
         int rc;
 
-        /* TODO: more transactional behavior. */
-
         /* Destroy existing pipes. */
         rc = destroy_current_pipes(dev);
@@ -432 +222 @@
 /** Retrieve basic descriptors from the device.
  *
- * @param[in] ctrl_pipe Control pipe with opened session.
+ * @param[in] ctrl_pipe Control endpoint pipe.
  * @param[out] descriptors Where to store the descriptors.
  * @return Error code.
@@ -440 +230 @@
 {
         assert(descriptors != NULL);
-        assert(usb_pipe_is_session_started(ctrl_pipe));
 
         descriptors->configuration = NULL;
 
         int rc;
+
+        /* It is worth to start a long transfer. */
+        rc = usb_pipe_start_long_transfer(ctrl_pipe);
+        if (rc != EOK) {
+                return rc;
+        }
 
         /* Get the device descriptor. */
         rc = usb_request_get_device_descriptor(ctrl_pipe, &descriptors->device);
         if (rc != EOK) {
-                return rc;
+                goto leave;
         }
 
@@ -456 +251 @@
             ctrl_pipe, 0, (void **) &descriptors->configuration,
             &descriptors->configuration_size);
-        if (rc != EOK) {
-                return rc;
-        }
-
-        return EOK;
+
+leave:
+        usb_pipe_end_long_transfer(ctrl_pipe);
+
+        return rc;
 }
 
@@ -641 +436 @@
 }
 
+/** Initialize control pipe in a device.
+ *
+ * @param dev USB device in question.
+ * @param errmsg Where to store error context.
+ * @return
+ */
+static int init_wire_and_ctrl_pipe(usb_device_t *dev, const char **errmsg)
+{
+        int rc;
+
+        rc = usb_device_connection_initialize_from_device(&dev->wire,
+            dev->ddf_dev);
+        if (rc != EOK) {
+                *errmsg = "device connection initialization";
+                return rc;
+        }
+
+        rc = usb_pipe_initialize_default_control(&dev->ctrl_pipe,
+            &dev->wire);
+        if (rc != EOK) {
+                *errmsg = "default control pipe initialization";
+                return rc;
+        }
+
+        return EOK;
+}
+
+
+/** Create new instance of USB device.
+ *
+ * @param[in] ddf_dev Generic DDF device backing the USB one.
+ * @param[in] endpoints NULL terminated array of endpoints (NULL for none).
+ * @param[out] dev_ptr Where to store pointer to the new device.
+ * @param[out] errstr_ptr Where to store description of context
+ *      (in case error occurs).
+ * @return Error code.
+ */
+int usb_device_create(ddf_dev_t *ddf_dev,
+    usb_endpoint_description_t **endpoints,
+    usb_device_t **dev_ptr, const char **errstr_ptr)
+{
+        assert(dev_ptr != NULL);
+        assert(ddf_dev != NULL);
+
+        int rc;
+
+        usb_device_t *dev = malloc(sizeof(usb_device_t));
+        if (dev == NULL) {
+                *errstr_ptr = "structure allocation";
+                return ENOMEM;
+        }
+
+        // FIXME: proper deallocation in case of errors
+
+        dev->ddf_dev = ddf_dev;
+        dev->driver_data = NULL;
+        dev->descriptors.configuration = NULL;
+        dev->alternate_interfaces = NULL;
+
+        dev->pipes_count = 0;
+        dev->pipes = NULL;
+
+        /* Initialize backing wire and control pipe. */
+        rc = init_wire_and_ctrl_pipe(dev, errstr_ptr);
+        if (rc != EOK) {
+                return rc;
+        }
+
+        /* Get our interface. */
+        dev->interface_no = usb_device_get_assigned_interface(dev->ddf_dev);
+
+        /* Retrieve standard descriptors. */
+        rc = usb_device_retrieve_descriptors(&dev->ctrl_pipe,
+            &dev->descriptors);
+        if (rc != EOK) {
+                *errstr_ptr = "descriptor retrieval";
+                return rc;
+        }
+
+        /* Create alternate interfaces. */
+        rc = usb_alternate_interfaces_create(dev->descriptors.configuration,
+            dev->descriptors.configuration_size, dev->interface_no,
+            &dev->alternate_interfaces);
+        if (rc != EOK) {
+                /* We will try to silently ignore this. */
+                dev->alternate_interfaces = NULL;
+        }
+
+        rc = initialize_other_pipes(endpoints, dev, 0);
+        if (rc != EOK) {
+                *errstr_ptr = "pipes initialization";
+                return rc;
+        }
+
+        *errstr_ptr = NULL;
+        *dev_ptr = dev;
+
+        return EOK;
+}
+
 /**
  * @}