drivers/usb/usb-common.c

   1 /*
   2  * Provides code common for host and device side USB.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation, version 2.
   7  *
   8  * If either host side (ie. CONFIG_USB=y) or device side USB stack
   9  * (ie. CONFIG_USB_GADGET=y) is compiled in the kernel, this module is
  10  * compiled-in as well.  Otherwise, if either of the two stacks is
  11  * compiled as module, this file is compiled as module as well.
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/usb/ch9.h>
  17 #include <linux/usb/otg.h>
  18
  19 const char *usb_otg_state_string(enum usb_otg_state state)
  20 {
  21         static const char *const names[] = {
  22                 [OTG_STATE_A_IDLE] = "a_idle",
  23                 [OTG_STATE_A_WAIT_VRISE] = "a_wait_vrise",
  24                 [OTG_STATE_A_WAIT_BCON] = "a_wait_bcon",
  25                 [OTG_STATE_A_HOST] = "a_host",
  26                 [OTG_STATE_A_SUSPEND] = "a_suspend",
  27                 [OTG_STATE_A_PERIPHERAL] = "a_peripheral",
  28                 [OTG_STATE_A_WAIT_VFALL] = "a_wait_vfall",
  29                 [OTG_STATE_A_VBUS_ERR] = "a_vbus_err",
  30                 [OTG_STATE_B_IDLE] = "b_idle",
  31                 [OTG_STATE_B_SRP_INIT] = "b_srp_init",
  32                 [OTG_STATE_B_PERIPHERAL] = "b_peripheral",
  33                 [OTG_STATE_B_WAIT_ACON] = "b_wait_acon",
  34                 [OTG_STATE_B_HOST] = "b_host",
  35         };
  36
  37         if (state < 0 || state >= ARRAY_SIZE(names))
  38                 return "UNDEFINED";
  39
  40         return names[state];
  41 }
  42 EXPORT_SYMBOL_GPL(usb_otg_state_string);
  43
  44 const char *usb_speed_string(enum usb_device_speed speed)
  45 {
  46         static const char *const names[] = {
  47                 [USB_SPEED_UNKNOWN] = "UNKNOWN",
  48                 [USB_SPEED_LOW] = "low-speed",
  49                 [USB_SPEED_FULL] = "full-speed",
  50                 [USB_SPEED_HIGH] = "high-speed",
  51                 [USB_SPEED_WIRELESS] = "wireless",
  52                 [USB_SPEED_SUPER] = "super-speed",
  53         };
  54
  55         if (speed < 0 || speed >= ARRAY_SIZE(names))
  56                 speed = USB_SPEED_UNKNOWN;
  57         return names[speed];
  58 }
  59 EXPORT_SYMBOL_GPL(usb_speed_string);
  60
  61 const char *usb_state_string(enum usb_device_state state)
  62 {
  63         static const char *const names[] = {
  64                 [USB_STATE_NOTATTACHED] = "not attached",
  65                 [USB_STATE_ATTACHED] = "attached",
  66                 [USB_STATE_POWERED] = "powered",
  67                 [USB_STATE_RECONNECTING] = "reconnecting",
  68                 [USB_STATE_UNAUTHENTICATED] = "unauthenticated",
  69                 [USB_STATE_DEFAULT] = "default",
  70                 [USB_STATE_ADDRESS] = "addresssed",
  71                 [USB_STATE_CONFIGURED] = "configured",
  72                 [USB_STATE_SUSPENDED] = "suspended",
  73         };
  74
  75         if (state < 0 || state >= ARRAY_SIZE(names))
  76                 return "UNKNOWN";
  77
  78         return names[state];
  79 }
  80 EXPORT_SYMBOL_GPL(usb_state_string);
  81
  82 MODULE_LICENSE("GPL");