| /* |
| * otg.c -- USB OTG utility code |
| * |
| * Copyright (C) 2004 Texas Instruments |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/export.h> |
| #include <linux/device.h> |
| |
| #include <linux/usb/otg.h> |
| |
| static struct usb_phy *phy; |
| |
| /** |
| * usb_get_phy - find the (single) USB PHY |
| * |
| * Returns the phy driver, after getting a refcount to it; or |
| * null if there is no such phy. The caller is responsible for |
| * calling usb_put_phy() to release that count. |
| * |
| * For use by USB host and peripheral drivers. |
| */ |
| struct usb_phy *usb_get_phy(void) |
| { |
| if (phy) |
| get_device(phy->dev); |
| return phy; |
| } |
| EXPORT_SYMBOL(usb_get_phy); |
| |
| /** |
| * usb_put_phy - release the (single) USB PHY |
| * @x: the phy returned by usb_get_phy() |
| * |
| * Releases a refcount the caller received from usb_get_phy(). |
| * |
| * For use by USB host and peripheral drivers. |
| */ |
| void usb_put_phy(struct usb_phy *x) |
| { |
| if (x) |
| put_device(x->dev); |
| } |
| EXPORT_SYMBOL(usb_put_phy); |
| |
| /** |
| * usb_add_phy - declare the (single) USB PHY |
| * @x: the USB phy to be used; or NULL |
| * |
| * This call is exclusively for use by phy drivers, which |
| * coordinate the activities of drivers for host and peripheral |
| * controllers, and in some cases for VBUS current regulation. |
| */ |
| int usb_add_phy(struct usb_phy *x) |
| { |
| if (phy && x) |
| return -EBUSY; |
| phy = x; |
| return 0; |
| } |
| EXPORT_SYMBOL(usb_add_phy); |
| |
| const char *otg_state_string(enum usb_otg_state state) |
| { |
| switch (state) { |
| case OTG_STATE_A_IDLE: |
| return "a_idle"; |
| case OTG_STATE_A_WAIT_VRISE: |
| return "a_wait_vrise"; |
| case OTG_STATE_A_WAIT_BCON: |
| return "a_wait_bcon"; |
| case OTG_STATE_A_HOST: |
| return "a_host"; |
| case OTG_STATE_A_SUSPEND: |
| return "a_suspend"; |
| case OTG_STATE_A_PERIPHERAL: |
| return "a_peripheral"; |
| case OTG_STATE_A_WAIT_VFALL: |
| return "a_wait_vfall"; |
| case OTG_STATE_A_VBUS_ERR: |
| return "a_vbus_err"; |
| case OTG_STATE_B_IDLE: |
| return "b_idle"; |
| case OTG_STATE_B_SRP_INIT: |
| return "b_srp_init"; |
| case OTG_STATE_B_PERIPHERAL: |
| return "b_peripheral"; |
| case OTG_STATE_B_WAIT_ACON: |
| return "b_wait_acon"; |
| case OTG_STATE_B_HOST: |
| return "b_host"; |
| default: |
| return "UNDEFINED"; |
| } |
| } |
| EXPORT_SYMBOL(otg_state_string); |