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 21 const 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 } 44 EXPORT_SYMBOL_GPL(usb_otg_state_string); 45 46 static 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 55 const 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 } 61 EXPORT_SYMBOL_GPL(usb_speed_string); 62 63 enum usb_device_speed usb_get_maximum_speed(struct device *dev) 64 { 65 const char *maximum_speed; 66 int err; 67 int i; 68 69 err = device_property_read_string(dev, "maximum-speed", &maximum_speed); 70 if (err < 0) 71 return USB_SPEED_UNKNOWN; 72 73 for (i = 0; i < ARRAY_SIZE(speed_names); i++) 74 if (strcmp(maximum_speed, speed_names[i]) == 0) 75 return i; 76 77 return USB_SPEED_UNKNOWN; 78 } 79 EXPORT_SYMBOL_GPL(usb_get_maximum_speed); 80 81 const char *usb_state_string(enum usb_device_state state) 82 { 83 static const char *const names[] = { 84 [USB_STATE_NOTATTACHED] = "not attached", 85 [USB_STATE_ATTACHED] = "attached", 86 [USB_STATE_POWERED] = "powered", 87 [USB_STATE_RECONNECTING] = "reconnecting", 88 [USB_STATE_UNAUTHENTICATED] = "unauthenticated", 89 [USB_STATE_DEFAULT] = "default", 90 [USB_STATE_ADDRESS] = "addressed", 91 [USB_STATE_CONFIGURED] = "configured", 92 [USB_STATE_SUSPENDED] = "suspended", 93 }; 94 95 if (state < 0 || state >= ARRAY_SIZE(names)) 96 return "UNKNOWN"; 97 98 return names[state]; 99 } 100 EXPORT_SYMBOL_GPL(usb_state_string); 101 102 static const char *const usb_dr_modes[] = { 103 [USB_DR_MODE_UNKNOWN] = "", 104 [USB_DR_MODE_HOST] = "host", 105 [USB_DR_MODE_PERIPHERAL] = "peripheral", 106 [USB_DR_MODE_OTG] = "otg", 107 }; 108 109 enum usb_dr_mode usb_get_dr_mode(struct device *dev) 110 { 111 const char *dr_mode; 112 int err, i; 113 114 err = device_property_read_string(dev, "dr_mode", &dr_mode); 115 if (err < 0) 116 return USB_DR_MODE_UNKNOWN; 117 118 for (i = 0; i < ARRAY_SIZE(usb_dr_modes); i++) 119 if (!strcmp(dr_mode, usb_dr_modes[i])) 120 return i; 121 122 return USB_DR_MODE_UNKNOWN; 123 } 124 EXPORT_SYMBOL_GPL(usb_get_dr_mode); 125 126 #ifdef CONFIG_OF 127 /** 128 * of_usb_host_tpl_support - to get if Targeted Peripheral List is supported 129 * for given targeted hosts (non-PC hosts) 130 * @np: Pointer to the given device_node 131 * 132 * The function gets if the targeted hosts support TPL or not 133 */ 134 bool of_usb_host_tpl_support(struct device_node *np) 135 { 136 if (of_find_property(np, "tpl-support", NULL)) 137 return true; 138 139 return false; 140 } 141 EXPORT_SYMBOL_GPL(of_usb_host_tpl_support); 142 143 /** 144 * of_usb_update_otg_caps - to update usb otg capabilities according to 145 * the passed properties in DT. 146 * @np: Pointer to the given device_node 147 * @otg_caps: Pointer to the target usb_otg_caps to be set 148 * 149 * The function updates the otg capabilities 150 */ 151 int of_usb_update_otg_caps(struct device_node *np, 152 struct usb_otg_caps *otg_caps) 153 { 154 u32 otg_rev; 155 156 if (!otg_caps) 157 return -EINVAL; 158 159 if (!of_property_read_u32(np, "otg-rev", &otg_rev)) { 160 switch (otg_rev) { 161 case 0x0100: 162 case 0x0120: 163 case 0x0130: 164 case 0x0200: 165 /* Choose the lesser one if it's already been set */ 166 if (otg_caps->otg_rev) 167 otg_caps->otg_rev = min_t(u16, otg_rev, 168 otg_caps->otg_rev); 169 else 170 otg_caps->otg_rev = otg_rev; 171 break; 172 default: 173 pr_err("%s: unsupported otg-rev: 0x%x\n", 174 np->full_name, otg_rev); 175 return -EINVAL; 176 } 177 } else { 178 /* 179 * otg-rev is mandatory for otg properties, if not passed 180 * we set it to be 0 and assume it's a legacy otg device. 181 * Non-dt platform can set it afterwards. 182 */ 183 otg_caps->otg_rev = 0; 184 } 185 186 if (of_find_property(np, "hnp-disable", NULL)) 187 otg_caps->hnp_support = false; 188 if (of_find_property(np, "srp-disable", NULL)) 189 otg_caps->srp_support = false; 190 if (of_find_property(np, "adp-disable", NULL) || 191 (otg_caps->otg_rev < 0x0200)) 192 otg_caps->adp_support = false; 193 194 return 0; 195 } 196 EXPORT_SYMBOL_GPL(of_usb_update_otg_caps); 197 198 #endif 199 200 MODULE_LICENSE("GPL"); 201