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 const 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 } 82 EXPORT_SYMBOL_GPL(usb_state_string); 83 84 #ifdef CONFIG_OF 85 static 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 */ 99 enum 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 } 114 EXPORT_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 */ 124 enum 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 } 140 EXPORT_SYMBOL_GPL(of_usb_get_maximum_speed); 141 142 /** 143 * of_usb_host_tpl_support - to get if Targeted Peripheral List is supported 144 * for given targeted hosts (non-PC hosts) 145 * @np: Pointer to the given device_node 146 * 147 * The function gets if the targeted hosts support TPL or not 148 */ 149 bool of_usb_host_tpl_support(struct device_node *np) 150 { 151 if (of_find_property(np, "tpl-support", NULL)) 152 return true; 153 154 return false; 155 } 156 EXPORT_SYMBOL_GPL(of_usb_host_tpl_support); 157 158 /** 159 * of_usb_update_otg_caps - to update usb otg capabilities according to 160 * the passed properties in DT. 161 * @np: Pointer to the given device_node 162 * @otg_caps: Pointer to the target usb_otg_caps to be set 163 * 164 * The function updates the otg capabilities 165 */ 166 int of_usb_update_otg_caps(struct device_node *np, 167 struct usb_otg_caps *otg_caps) 168 { 169 u32 otg_rev; 170 171 if (!otg_caps) 172 return -EINVAL; 173 174 if (!of_property_read_u32(np, "otg-rev", &otg_rev)) { 175 switch (otg_rev) { 176 case 0x0100: 177 case 0x0120: 178 case 0x0130: 179 case 0x0200: 180 /* Choose the lesser one if it's already been set */ 181 if (otg_caps->otg_rev) 182 otg_caps->otg_rev = min_t(u16, otg_rev, 183 otg_caps->otg_rev); 184 else 185 otg_caps->otg_rev = otg_rev; 186 break; 187 default: 188 pr_err("%s: unsupported otg-rev: 0x%x\n", 189 np->full_name, otg_rev); 190 return -EINVAL; 191 } 192 } else { 193 /* 194 * otg-rev is mandatory for otg properties, if not passed 195 * we set it to be 0 and assume it's a legacy otg device. 196 * Non-dt platform can set it afterwards. 197 */ 198 otg_caps->otg_rev = 0; 199 } 200 201 if (of_find_property(np, "hnp-disable", NULL)) 202 otg_caps->hnp_support = false; 203 if (of_find_property(np, "srp-disable", NULL)) 204 otg_caps->srp_support = false; 205 if (of_find_property(np, "adp-disable", NULL) || 206 (otg_caps->otg_rev < 0x0200)) 207 otg_caps->adp_support = false; 208 209 return 0; 210 } 211 EXPORT_SYMBOL_GPL(of_usb_update_otg_caps); 212 213 #endif 214 215 MODULE_LICENSE("GPL"); 216