Changes in uspace/lib/usb/src/dev.c [026271d5:b49d872] in mainline

File:

• uspace/lib/usb/src/dev.c (modified) (2 diffs)

uspace/lib/usb/src/dev.c

@@ -29 +29 @@
 
 #include <usb/dev.h>
+#include <usb/hc.h>
 #include <errno.h>
 #include <usb_iface.h>
 #include <str.h>
 #include <stdio.h>
+
+#define MAX_DEVICE_PATH 1024
+
+/** Find host controller handle, address and iface number for the device.
+ *
+ * @param[in] device_handle Device devman handle.
+ * @param[out] hc_handle Where to store handle of host controller
+ *      controlling device with @p device_handle handle.
+ * @param[out] address Place to store the device's address
+ * @param[out] iface Place to stoer the assigned USB interface number.
+ * @return Error code.
+ */
+int usb_get_info_by_handle(devman_handle_t device_handle,
+    devman_handle_t *hc_handle, usb_address_t *address, int *iface)
+{
+        async_sess_t *parent_sess =
+            devman_parent_device_connect(EXCHANGE_ATOMIC, device_handle,
+                IPC_FLAG_BLOCKING);
+        if (!parent_sess)
+                return ENOMEM;
+
+        async_exch_t *exch = async_exchange_begin(parent_sess);
+        if (!exch) {
+                async_hangup(parent_sess);
+                return ENOMEM;
+        }
+
+        usb_address_t tmp_address;
+        devman_handle_t tmp_handle;
+        int tmp_iface;
+
+        if (address) {
+                const int ret = usb_get_my_address(exch, &tmp_address);
+                if (ret != EOK) {
+                        async_exchange_end(exch);
+                        async_hangup(parent_sess);
+                        return ret;
+                }
+        }
+
+        if (hc_handle) {
+                const int ret = usb_get_hc_handle(exch, &tmp_handle);
+                if (ret != EOK) {
+                        async_exchange_end(exch);
+                        async_hangup(parent_sess);
+                        return ret;
+                }
+        }
+
+        if (iface) {
+                const int ret = usb_get_my_interface(exch, &tmp_iface);
+                switch (ret) {
+                case ENOTSUP:
+                        /* Implementing GET_MY_INTERFACE is voluntary. */
+                        tmp_iface = -1;
+                case EOK:
+                        break;
+                default:
+                        async_exchange_end(exch);
+                        async_hangup(parent_sess);
+                        return ret;
+                }
+        }
+
+        if (hc_handle)
+                *hc_handle = tmp_handle;
+
+        if (address)
+                *address = tmp_address;
+
+        if (iface)
+                *iface = tmp_iface;
+
+        async_exchange_end(exch);
+        async_hangup(parent_sess);
+
+        return EOK;
+}
+
+static bool try_parse_bus_and_address(const char *path,
+    const char **func_start,
+    devman_handle_t *out_hc_handle, usb_address_t *out_device_address)
+{
+        uint64_t sid;
+        size_t address;
+        int rc;
+        const char *ptr;
+
+        rc = str_uint64_t(path, &ptr, 10, false, &sid);
+        if (rc != EOK) {
+                return false;
+        }
+        if ((*ptr == ':') || (*ptr == '.')) {
+                ptr++;
+        } else {
+                return false;
+        }
+        rc = str_size_t(ptr, func_start, 10, false, &address);
+        if (rc != EOK) {
+                return false;
+        }
+        rc = usb_ddf_get_hc_handle_by_sid(sid, out_hc_handle);
+        if (rc != EOK) {
+                return false;
+        }
+        if (out_device_address != NULL) {
+                *out_device_address = (usb_address_t) address;
+        }
+        return true;
+}
+
+static int get_device_handle_by_address(devman_handle_t hc_handle, int addr,
+    devman_handle_t *dev_handle)
+{
+        usb_hc_connection_t conn;
+        usb_hc_connection_initialize(&conn, hc_handle);
+
+        const int rc = usb_hc_get_handle_by_address(&conn, addr, dev_handle);
+
+        return rc;
+}
 
 /** Resolve handle and address of USB device from its path.
@@ -53 +175 @@
  * @return Error code.
  */
-int usb_resolve_device_handle(const char *dev_path, devman_handle_t *dev_handle)
+int usb_resolve_device_handle(const char *dev_path, devman_handle_t *out_hc_handle,
+    usb_address_t *out_dev_addr, devman_handle_t *out_dev_handle)
 {
-        if (dev_path == NULL || dev_handle == NULL) {
+        if (dev_path == NULL) {
                 return EBADMEM;
         }
 
-        /* First, try to get the device handle. */
-        int rc = devman_fun_get_handle(dev_path, dev_handle, 0);
-
-        /* Next, try parsing dev_handle from the provided string */
+        bool found_hc = false;
+        bool found_addr = false;
+        devman_handle_t hc_handle, dev_handle;
+        usb_address_t dev_addr = -1;
+        int rc;
+        bool is_bus_addr;
+        const char *func_start = NULL;
+        char *path = NULL;
+
+        /* First try the BUS.ADDR format. */
+        is_bus_addr = try_parse_bus_and_address(dev_path, &func_start,
+            &hc_handle, &dev_addr);
+        if (is_bus_addr) {
+                found_hc = true;
+                found_addr = true;
+                /*
+                 * Now get the handle of the device. We will need that
+                 * in both cases. If there is only BUS.ADDR, it will
+                 * be the handle to be returned to the caller, otherwise
+                 * we will need it to resolve the path to which the
+                 * suffix would be appended.
+                 */
+                /* If there is nothing behind the BUS.ADDR, we will
+                 * get the device handle from the host controller.
+                 * Otherwise, we will
+                 */
+                rc = get_device_handle_by_address(hc_handle, dev_addr,
+                    &dev_handle);
+                if (rc != EOK) {
+                        return rc;
+                }
+                if (str_length(func_start) > 0) {
+                        char tmp_path[MAX_DEVICE_PATH];
+                        rc = devman_fun_get_path(dev_handle,
+                            tmp_path, MAX_DEVICE_PATH);
+                        if (rc != EOK) {
+                                return rc;
+                        }
+                        rc = asprintf(&path, "%s%s", tmp_path, func_start);
+                        if (rc < 0) {
+                                return ENOMEM;
+                        }
+                } else {
+                        /* Everything is resolved. Get out of here. */
+                        goto copy_out;
+                }
+        } else {
+                path = str_dup(dev_path);
+                if (path == NULL) {
+                        return ENOMEM;
+                }
+        }
+
+        /* First try to get the device handle. */
+        rc = devman_fun_get_handle(path, &dev_handle, 0);
         if (rc != EOK) {
-                *dev_handle = strtoul(dev_path, NULL, 10);
-                //FIXME: check errno
-                rc = EOK;
-        }
-        return rc;
+                free(path);
+                /* Invalid path altogether. */
+                return rc;
+        }
+
+        /* Remove suffixes and hope that we will encounter device node. */
+        while (str_length(path) > 0) {
+                /* Get device handle first. */
+                devman_handle_t tmp_handle;
+                rc = devman_fun_get_handle(path, &tmp_handle, 0);
+                if (rc != EOK) {
+                        free(path);
+                        return rc;
+                }
+
+                /* Try to find its host controller. */
+                if (!found_hc) {
+                        rc = usb_get_hc_by_handle(tmp_handle, &hc_handle);
+                        if (rc == EOK) {
+                                found_hc = true;
+                        }
+                }
+
+                /* Try to get its address. */
+                if (!found_addr) {
+                        rc = usb_get_address_by_handle(tmp_handle, &dev_addr);
+                        if (rc == 0) {
+                                found_addr = true;
+                        }
+                }
+
+                /* Speed-up. */
+                if (found_hc && found_addr) {
+                        break;
+                }
+
+                /* Remove the last suffix. */
+                char *slash_pos = str_rchr(path, '/');
+                if (slash_pos != NULL) {
+                        *slash_pos = 0;
+                }
+        }
+
+        free(path);
+
+        if (!found_addr || !found_hc) {
+                return ENOENT;
+        }
+
+copy_out:
+        if (out_dev_addr != NULL) {
+                *out_dev_addr = dev_addr;
+        }
+        if (out_hc_handle != NULL) {
+                *out_hc_handle = hc_handle;
+        }
+        if (out_dev_handle != NULL) {
+                *out_dev_handle = dev_handle;
+        }
+
+        return EOK;
 }