Changeset 1a6a234 in mainline

Timestamp:

2011-02-23T21:22:41Z (13 years ago)

Author:

Vojtech Horky <vojtechhorky@…>

Branches:

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

Children:

7eebe2a

Parents:

14670bf

Message:

Retrieval of list of supported languages (strings)

Location:

uspace/lib/usb

Files:

• include/usb/request.h (modified) (2 diffs)
• src/request.c (modified) (1 diff)

uspace/lib/usb/include/usb/request.h

@@ -37 +37 @@
 
 #include <sys/types.h>
+#include <l18n/langs.h>
 #include <usb/usb.h>
 #include <usb/pipes.h>
@@ -106 +107 @@
 int usb_request_set_configuration(usb_endpoint_pipe_t *, uint8_t);
 
+int usb_request_get_supported_languages(usb_endpoint_pipe_t *,
+    l18_win_locales_t **, size_t *);
+
 #endif
 /**

uspace/lib/usb/src/request.c

@@ -429 +429 @@
 }
 
+/** Get list of supported languages by USB device.
+ *
+ * @param[in] pipe Control endpoint pipe (session must be already started).
+ * @param[out] languages_ptr Where to store pointer to allocated array of
+ *      supported languages.
+ * @param[out] languages_count Number of supported languages.
+ * @return Error code.
+ */
+int usb_request_get_supported_languages(usb_endpoint_pipe_t *pipe,
+    l18_win_locales_t **languages_ptr, size_t *languages_count)
+{
+        int rc;
+
+        if (languages_ptr == NULL) {
+                return EBADMEM;
+        }
+        if (languages_count == NULL) {
+                return EBADMEM;
+        }
+
+        uint8_t *string_descriptor = NULL;
+        size_t string_descriptor_size = 0;
+        rc = usb_request_get_descriptor_alloc(pipe,
+            USB_REQUEST_TYPE_STANDARD, USB_DESCTYPE_STRING, 0, 0,
+            (void **) &string_descriptor, &string_descriptor_size);
+        if (rc != EOK) {
+                return rc;
+        }
+        if (string_descriptor_size <= 2) {
+                free(string_descriptor);
+                return EEMPTY;
+        }
+        /* Substract first 2 bytes (length and descriptor type). */
+        string_descriptor_size -= 2;
+
+        /* Odd number of bytes - descriptor is broken? */
+        if ((string_descriptor_size % 2) != 0) {
+                /* FIXME: shall we return with error or silently ignore? */
+                free(string_descriptor);
+                return ESTALL;
+        }
+
+        size_t langs_count = string_descriptor_size / 2;
+        l18_win_locales_t *langs
+            = malloc(sizeof(l18_win_locales_t) * langs_count);
+        if (langs == NULL) {
+                free(string_descriptor);
+                return ENOMEM;
+        }
+
+        size_t i;
+        for (i = 0; i < langs_count; i++) {
+                /* Language code from the descriptor is in USB endianess. */
+                /* FIXME: is this really correct? */
+                uint16_t lang_code = (string_descriptor[2 + 2 * i + 1] << 8)
+                    + string_descriptor[2 + 2 * i];
+                langs[i] = uint16_usb2host(lang_code);
+        }
+
+        free(string_descriptor);
+
+        *languages_ptr = langs;
+        *languages_count =langs_count;
+
+        return EOK;
+}
+
 /**
  * @}