/* * 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_UNDEFINED] = "undefined", [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_CHARGER] = "b_charger", [OTG_STATE_B_WAIT_ACON] = "b_wait_acon", [OTG_STATE_B_HOST] = "b_host", [OTG_STATE_B_SUSPEND] = "b_suspend", }; 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");