2 * otg.c -- USB OTG utility code
4 * Copyright (C) 2004 Texas Instruments
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
12 #include <linux/kernel.h>
13 #include <linux/export.h>
14 #include <linux/device.h>
16 #include <linux/usb/otg.h>
18 static struct usb_phy *phy;
21 * usb_get_transceiver - find the (single) USB transceiver
23 * Returns the transceiver driver, after getting a refcount to it; or
24 * null if there is no such transceiver. The caller is responsible for
25 * calling usb_put_transceiver() to release that count.
27 * For use by USB host and peripheral drivers.
29 struct usb_phy *usb_get_transceiver(void)
35 EXPORT_SYMBOL(usb_get_transceiver);
38 * usb_put_transceiver - release the (single) USB transceiver
39 * @x: the transceiver returned by usb_get_transceiver()
41 * Releases a refcount the caller received from usb_get_transceiver().
43 * For use by USB host and peripheral drivers.
45 void usb_put_transceiver(struct usb_phy *x)
50 EXPORT_SYMBOL(usb_put_transceiver);
53 * usb_set_transceiver - declare the (single) USB transceiver
54 * @x: the USB transceiver to be used; or NULL
56 * This call is exclusively for use by transceiver drivers, which
57 * coordinate the activities of drivers for host and peripheral
58 * controllers, and in some cases for VBUS current regulation.
60 int usb_set_transceiver(struct usb_phy *x)
67 EXPORT_SYMBOL(usb_set_transceiver);
69 const char *otg_state_string(enum usb_otg_state state)
72 case OTG_STATE_A_IDLE:
74 case OTG_STATE_A_WAIT_VRISE:
75 return "a_wait_vrise";
76 case OTG_STATE_A_WAIT_BCON:
78 case OTG_STATE_A_HOST:
80 case OTG_STATE_A_SUSPEND:
82 case OTG_STATE_A_PERIPHERAL:
83 return "a_peripheral";
84 case OTG_STATE_A_WAIT_VFALL:
85 return "a_wait_vfall";
86 case OTG_STATE_A_VBUS_ERR:
88 case OTG_STATE_B_IDLE:
90 case OTG_STATE_B_SRP_INIT:
92 case OTG_STATE_B_PERIPHERAL:
93 return "b_peripheral";
94 case OTG_STATE_B_WAIT_ACON:
96 case OTG_STATE_B_HOST:
102 EXPORT_SYMBOL(otg_state_string);