1 files changed, 159 insertions, 0 deletions

diff --git a/kernel/drivers/usb/common/common.c b/kernel/drivers/usb/common/common.c
new file mode 100644
index 000000000..b530fd403
--- /dev/null
+++ b/kernel/drivers/usb/common/common.c
@@ -0,0 +1,159 @@
+/*
+ * Provides code common for host and device side USB.
+ *
+ * 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, version 2.
+ *
+ * If either host side (ie. CONFIG_USB=y) or device side USB stack
+ * (ie. CONFIG_USB_GADGET=y) is compiled in the kernel, this module is
+ * compiled-in as well.  Otherwise, if either of the two stacks is
+ * compiled as module, this file is compiled as module as well.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/of.h>
+#include <linux/usb/otg.h>
+
+const char *usb_otg_state_string(enum usb_otg_state state)
+{
+	static const char *const names[] = {
+		[OTG_STATE_A_IDLE] = "a_idle",
+		[OTG_STATE_A_WAIT_VRISE] = "a_wait_vrise",
+		[OTG_STATE_A_WAIT_BCON] = "a_wait_bcon",
+		[OTG_STATE_A_HOST] = "a_host",
+		[OTG_STATE_A_SUSPEND] = "a_suspend",
+		[OTG_STATE_A_PERIPHERAL] = "a_peripheral",
+		[OTG_STATE_A_WAIT_VFALL] = "a_wait_vfall",
+		[OTG_STATE_A_VBUS_ERR] = "a_vbus_err",
+		[OTG_STATE_B_IDLE] = "b_idle",
+		[OTG_STATE_B_SRP_INIT] = "b_srp_init",
+		[OTG_STATE_B_PERIPHERAL] = "b_peripheral",
+		[OTG_STATE_B_WAIT_ACON] = "b_wait_acon",
+		[OTG_STATE_B_HOST] = "b_host",
+	};
+
+	if (state < 0 || state >= ARRAY_SIZE(names))
+		return "UNDEFINED";
+
+	return names[state];
+}
+EXPORT_SYMBOL_GPL(usb_otg_state_string);
+
+static const char *const speed_names[] = {
+	[USB_SPEED_UNKNOWN] = "UNKNOWN",
+	[USB_SPEED_LOW] = "low-speed",
+	[USB_SPEED_FULL] = "full-speed",
+	[USB_SPEED_HIGH] = "high-speed",
+	[USB_SPEED_WIRELESS] = "wireless",
+	[USB_SPEED_SUPER] = "super-speed",
+};
+
+const char *usb_speed_string(enum usb_device_speed speed)
+{
+	if (speed < 0 || speed >= ARRAY_SIZE(speed_names))
+		speed = USB_SPEED_UNKNOWN;
+	return speed_names[speed];
+}
+EXPORT_SYMBOL_GPL(usb_speed_string);
+
+const char *usb_state_string(enum usb_device_state state)
+{
+	static const char *const names[] = {
+		[USB_STATE_NOTATTACHED] = "not attached",
+		[USB_STATE_ATTACHED] = "attached",
+		[USB_STATE_POWERED] = "powered",
+		[USB_STATE_RECONNECTING] = "reconnecting",
+		[USB_STATE_UNAUTHENTICATED] = "unauthenticated",
+		[USB_STATE_DEFAULT] = "default",
+		[USB_STATE_ADDRESS] = "addressed",
+		[USB_STATE_CONFIGURED] = "configured",
+		[USB_STATE_SUSPENDED] = "suspended",
+	};
+
+	if (state < 0 || state >= ARRAY_SIZE(names))
+		return "UNKNOWN";
+
+	return names[state];
+}
+EXPORT_SYMBOL_GPL(usb_state_string);
+
+#ifdef CONFIG_OF
+static const char *const usb_dr_modes[] = {
+	[USB_DR_MODE_UNKNOWN]		= "",
+	[USB_DR_MODE_HOST]		= "host",
+	[USB_DR_MODE_PERIPHERAL]	= "peripheral",
+	[USB_DR_MODE_OTG]		= "otg",
+};
+
+/**
+ * of_usb_get_dr_mode - Get dual role mode for given device_node
+ * @np:	Pointer to the given device_node
+ *
+ * The function gets phy interface string from property 'dr_mode',
+ * and returns the correspondig enum usb_dr_mode
+ */
+enum usb_dr_mode of_usb_get_dr_mode(struct device_node *np)
+{
+	const char *dr_mode;
+	int err, i;
+
+	err = of_property_read_string(np, "dr_mode", &dr_mode);
+	if (err < 0)
+		return USB_DR_MODE_UNKNOWN;
+
+	for (i = 0; i < ARRAY_SIZE(usb_dr_modes); i++)
+		if (!strcmp(dr_mode, usb_dr_modes[i]))
+			return i;
+
+	return USB_DR_MODE_UNKNOWN;
+}
+EXPORT_SYMBOL_GPL(of_usb_get_dr_mode);
+
+/**
+ * of_usb_get_maximum_speed - Get maximum requested speed for a given USB
+ * controller.
+ * @np: Pointer to the given device_node
+ *
+ * The function gets the maximum speed string from property "maximum-speed",
+ * and returns the corresponding enum usb_device_speed.
+ */
+enum usb_device_speed of_usb_get_maximum_speed(struct device_node *np)
+{
+	const char *maximum_speed;
+	int err;
+	int i;
+
+	err = of_property_read_string(np, "maximum-speed", &maximum_speed);
+	if (err < 0)
+		return USB_SPEED_UNKNOWN;
+
+	for (i = 0; i < ARRAY_SIZE(speed_names); i++)
+		if (strcmp(maximum_speed, speed_names[i]) == 0)
+			return i;
+
+	return USB_SPEED_UNKNOWN;
+}
+EXPORT_SYMBOL_GPL(of_usb_get_maximum_speed);
+
+/**
+ * of_usb_host_tpl_support - to get if Targeted Peripheral List is supported
+ * for given targeted hosts (non-PC hosts)
+ * @np: Pointer to the given device_node
+ *
+ * The function gets if the targeted hosts support TPL or not
+ */
+bool of_usb_host_tpl_support(struct device_node *np)
+{
+	if (of_find_property(np, "tpl-support", NULL))
+		return true;
+
+	return false;
+}
+EXPORT_SYMBOL_GPL(of_usb_host_tpl_support);
+#endif
+
+MODULE_LICENSE("GPL");