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/of.h>
 17#include <linux/usb/ch9.h>
 18#include <linux/usb/of.h>
 19#include <linux/usb/otg.h>
 20
 21const char *usb_otg_state_string(enum usb_otg_state state)
 22{
 23	static const char *const names[] = {
 24		[OTG_STATE_A_IDLE] = "a_idle",
 25		[OTG_STATE_A_WAIT_VRISE] = "a_wait_vrise",
 26		[OTG_STATE_A_WAIT_BCON] = "a_wait_bcon",
 27		[OTG_STATE_A_HOST] = "a_host",
 28		[OTG_STATE_A_SUSPEND] = "a_suspend",
 29		[OTG_STATE_A_PERIPHERAL] = "a_peripheral",
 30		[OTG_STATE_A_WAIT_VFALL] = "a_wait_vfall",
 31		[OTG_STATE_A_VBUS_ERR] = "a_vbus_err",
 32		[OTG_STATE_B_IDLE] = "b_idle",
 33		[OTG_STATE_B_SRP_INIT] = "b_srp_init",
 34		[OTG_STATE_B_PERIPHERAL] = "b_peripheral",
 35		[OTG_STATE_B_WAIT_ACON] = "b_wait_acon",
 36		[OTG_STATE_B_HOST] = "b_host",
 37	};
 38
 39	if (state < 0 || state >= ARRAY_SIZE(names))
 40		return "UNDEFINED";
 41
 42	return names[state];
 43}
 44EXPORT_SYMBOL_GPL(usb_otg_state_string);
 45
 46static const char *const speed_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
 55const char *usb_speed_string(enum usb_device_speed speed)
 56{
 57	if (speed < 0 || speed >= ARRAY_SIZE(speed_names))
 58		speed = USB_SPEED_UNKNOWN;
 59	return speed_names[speed];
 60}
 61EXPORT_SYMBOL_GPL(usb_speed_string);
 62
 63const char *usb_state_string(enum usb_device_state state)
 64{
 65	static const char *const names[] = {
 66		[USB_STATE_NOTATTACHED] = "not attached",
 67		[USB_STATE_ATTACHED] = "attached",
 68		[USB_STATE_POWERED] = "powered",
 69		[USB_STATE_RECONNECTING] = "reconnecting",
 70		[USB_STATE_UNAUTHENTICATED] = "unauthenticated",
 71		[USB_STATE_DEFAULT] = "default",
 72		[USB_STATE_ADDRESS] = "addressed",
 73		[USB_STATE_CONFIGURED] = "configured",
 74		[USB_STATE_SUSPENDED] = "suspended",
 75	};
 76
 77	if (state < 0 || state >= ARRAY_SIZE(names))
 78		return "UNKNOWN";
 79
 80	return names[state];
 81}
 82EXPORT_SYMBOL_GPL(usb_state_string);
 83
 84#ifdef CONFIG_OF
 85static const char *const usb_dr_modes[] = {
 86	[USB_DR_MODE_UNKNOWN]		= "",
 87	[USB_DR_MODE_HOST]		= "host",
 88	[USB_DR_MODE_PERIPHERAL]	= "peripheral",
 89	[USB_DR_MODE_OTG]		= "otg",
 90};
 91
 92/**
 93 * of_usb_get_dr_mode - Get dual role mode for given device_node
 94 * @np:	Pointer to the given device_node
 95 *
 96 * The function gets phy interface string from property 'dr_mode',
 97 * and returns the correspondig enum usb_dr_mode
 98 */
 99enum usb_dr_mode of_usb_get_dr_mode(struct device_node *np)
100{
101	const char *dr_mode;
102	int err, i;
103
104	err = of_property_read_string(np, "dr_mode", &dr_mode);
105	if (err < 0)
106		return USB_DR_MODE_UNKNOWN;
107
108	for (i = 0; i < ARRAY_SIZE(usb_dr_modes); i++)
109		if (!strcmp(dr_mode, usb_dr_modes[i]))
110			return i;
111
112	return USB_DR_MODE_UNKNOWN;
113}
114EXPORT_SYMBOL_GPL(of_usb_get_dr_mode);
115
116/**
117 * of_usb_get_maximum_speed - Get maximum requested speed for a given USB
118 * controller.
119 * @np: Pointer to the given device_node
120 *
121 * The function gets the maximum speed string from property "maximum-speed",
122 * and returns the corresponding enum usb_device_speed.
123 */
124enum usb_device_speed of_usb_get_maximum_speed(struct device_node *np)
125{
126	const char *maximum_speed;
127	int err;
128	int i;
129
130	err = of_property_read_string(np, "maximum-speed", &maximum_speed);
131	if (err < 0)
132		return USB_SPEED_UNKNOWN;
133
134	for (i = 0; i < ARRAY_SIZE(speed_names); i++)
135		if (strcmp(maximum_speed, speed_names[i]) == 0)
136			return i;
137
138	return USB_SPEED_UNKNOWN;
139}
140EXPORT_SYMBOL_GPL(of_usb_get_maximum_speed);
141
142#endif
143
144MODULE_LICENSE("GPL");