/* * 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>#include <linux/of_platform.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",	[USB_SPEED_SUPER_PLUS] = "super-speed-plus",}; 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); enum usb_device_speed usb_get_maximum_speed(struct device *dev){	const char *maximum_speed;	int ret; 	ret = device_property_read_string(dev, "maximum-speed", &maximum_speed);	if (ret < 0)		return USB_SPEED_UNKNOWN; 	ret = match_string(speed_names, ARRAY_SIZE(speed_names), maximum_speed); 	return (ret < 0) ? USB_SPEED_UNKNOWN : ret;}EXPORT_SYMBOL_GPL(usb_get_maximum_speed); 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); 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",}; static enum usb_dr_mode usb_get_dr_mode_from_string(const char *str){	int ret; 	ret = match_string(usb_dr_modes, ARRAY_SIZE(usb_dr_modes), str);	return (ret < 0) ? USB_DR_MODE_UNKNOWN : ret;} enum usb_dr_mode usb_get_dr_mode(struct device *dev){	const char *dr_mode;	int err; 	err = device_property_read_string(dev, "dr_mode", &dr_mode);	if (err < 0)		return USB_DR_MODE_UNKNOWN; 	return usb_get_dr_mode_from_string(dr_mode);}EXPORT_SYMBOL_GPL(usb_get_dr_mode); #ifdef CONFIG_OF/** * of_usb_get_dr_mode_by_phy - Get dual role mode for the controller device * which is associated with the given phy device_node * @np:	Pointer to the given phy device_node * @arg0: phandle args[0] for phy's with #phy-cells >= 1, or -1 for *        phys which do not have phy-cells * * In dts a usb controller associates with phy devices.  The function gets * the string from property 'dr_mode' of the controller associated with the * given phy device node, and returns the correspondig enum usb_dr_mode. */enum usb_dr_mode of_usb_get_dr_mode_by_phy(struct device_node *np, int arg0){	struct device_node *controller = NULL;	struct of_phandle_args args;	const char *dr_mode;	int index;	int err; 	do {		controller = of_find_node_with_property(controller, "phys");		index = 0;		do {			if (arg0 == -1) {				args.np = of_parse_phandle(controller, "phys",							index);				args.args_count = 0;			} else {				err = of_parse_phandle_with_args(controller,							"phys", "#phy-cells",							index, &args);				if (err)					break;			} 			of_node_put(args.np);			if (args.np == np && (args.args_count == 0 ||					      args.args[0] == arg0))				goto finish;			index++;		} while (args.np);	} while (controller); finish:	err = of_property_read_string(controller, "dr_mode", &dr_mode);	of_node_put(controller); 	if (err < 0)		return USB_DR_MODE_UNKNOWN; 	return usb_get_dr_mode_from_string(dr_mode);}EXPORT_SYMBOL_GPL(of_usb_get_dr_mode_by_phy); /** * 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); /** * of_usb_update_otg_caps - to update usb otg capabilities according to * the passed properties in DT. * @np: Pointer to the given device_node * @otg_caps: Pointer to the target usb_otg_caps to be set * * The function updates the otg capabilities */int of_usb_update_otg_caps(struct device_node *np,			struct usb_otg_caps *otg_caps){	u32 otg_rev; 	if (!otg_caps)		return -EINVAL; 	if (!of_property_read_u32(np, "otg-rev", &otg_rev)) {		switch (otg_rev) {		case 0x0100:		case 0x0120:		case 0x0130:		case 0x0200:			/* Choose the lesser one if it's already been set */			if (otg_caps->otg_rev)				otg_caps->otg_rev = min_t(u16, otg_rev,							otg_caps->otg_rev);			else				otg_caps->otg_rev = otg_rev;			break;		default:			pr_err("%s: unsupported otg-rev: 0x%x\n",						np->full_name, otg_rev);			return -EINVAL;		}	} else {		/*		 * otg-rev is mandatory for otg properties, if not passed		 * we set it to be 0 and assume it's a legacy otg device.		 * Non-dt platform can set it afterwards.		 */		otg_caps->otg_rev = 0;	} 	if (of_find_property(np, "hnp-disable", NULL))		otg_caps->hnp_support = false;	if (of_find_property(np, "srp-disable", NULL))		otg_caps->srp_support = false;	if (of_find_property(np, "adp-disable", NULL) ||				(otg_caps->otg_rev < 0x0200))		otg_caps->adp_support = false; 	return 0;}EXPORT_SYMBOL_GPL(of_usb_update_otg_caps); #endif MODULE_LICENSE("GPL");