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 #include <linux/of_platform.h> 21 22 const char *usb_otg_state_string(enum usb_otg_state state) 23 { 24 static const char *const names[] = { 25 [OTG_STATE_A_IDLE] = "a_idle", 26 [OTG_STATE_A_WAIT_VRISE] = "a_wait_vrise", 27 [OTG_STATE_A_WAIT_BCON] = "a_wait_bcon", 28 [OTG_STATE_A_HOST] = "a_host", 29 [OTG_STATE_A_SUSPEND] = "a_suspend", 30 [OTG_STATE_A_PERIPHERAL] = "a_peripheral", 31 [OTG_STATE_A_WAIT_VFALL] = "a_wait_vfall", 32 [OTG_STATE_A_VBUS_ERR] = "a_vbus_err", 33 [OTG_STATE_B_IDLE] = "b_idle", 34 [OTG_STATE_B_SRP_INIT] = "b_srp_init", 35 [OTG_STATE_B_PERIPHERAL] = "b_peripheral", 36 [OTG_STATE_B_WAIT_ACON] = "b_wait_acon", 37 [OTG_STATE_B_HOST] = "b_host", 38 }; 39 40 if (state < 0 || state >= ARRAY_SIZE(names)) 41 return "UNDEFINED"; 42 43 return names[state]; 44 } 45 EXPORT_SYMBOL_GPL(usb_otg_state_string); 46 47 static const char *const speed_names[] = { 48 [USB_SPEED_UNKNOWN] = "UNKNOWN", 49 [USB_SPEED_LOW] = "low-speed", 50 [USB_SPEED_FULL] = "full-speed", 51 [USB_SPEED_HIGH] = "high-speed", 52 [USB_SPEED_WIRELESS] = "wireless", 53 [USB_SPEED_SUPER] = "super-speed", 54 [USB_SPEED_SUPER_PLUS] = "super-speed-plus", 55 }; 56 57 const char *usb_speed_string(enum usb_device_speed speed) 58 { 59 if (speed < 0 || speed >= ARRAY_SIZE(speed_names)) 60 speed = USB_SPEED_UNKNOWN; 61 return speed_names[speed]; 62 } 63 EXPORT_SYMBOL_GPL(usb_speed_string); 64 65 enum usb_device_speed usb_get_maximum_speed(struct device *dev) 66 { 67 const char *maximum_speed; 68 int err; 69 int i; 70 71 err = device_property_read_string(dev, "maximum-speed", &maximum_speed); 72 if (err < 0) 73 return USB_SPEED_UNKNOWN; 74 75 for (i = 0; i < ARRAY_SIZE(speed_names); i++) 76 if (strcmp(maximum_speed, speed_names[i]) == 0) 77 return i; 78 79 return USB_SPEED_UNKNOWN; 80 } 81 EXPORT_SYMBOL_GPL(usb_get_maximum_speed); 82 83 const char *usb_state_string(enum usb_device_state state) 84 { 85 static const char *const names[] = { 86 [USB_STATE_NOTATTACHED] = "not attached", 87 [USB_STATE_ATTACHED] = "attached", 88 [USB_STATE_POWERED] = "powered", 89 [USB_STATE_RECONNECTING] = "reconnecting", 90 [USB_STATE_UNAUTHENTICATED] = "unauthenticated", 91 [USB_STATE_DEFAULT] = "default", 92 [USB_STATE_ADDRESS] = "addressed", 93 [USB_STATE_CONFIGURED] = "configured", 94 [USB_STATE_SUSPENDED] = "suspended", 95 }; 96 97 if (state < 0 || state >= ARRAY_SIZE(names)) 98 return "UNKNOWN"; 99 100 return names[state]; 101 } 102 EXPORT_SYMBOL_GPL(usb_state_string); 103 104 static const char *const usb_dr_modes[] = { 105 [USB_DR_MODE_UNKNOWN] = "", 106 [USB_DR_MODE_HOST] = "host", 107 [USB_DR_MODE_PERIPHERAL] = "peripheral", 108 [USB_DR_MODE_OTG] = "otg", 109 }; 110 111 static enum usb_dr_mode usb_get_dr_mode_from_string(const char *str) 112 { 113 int i; 114 115 for (i = 0; i < ARRAY_SIZE(usb_dr_modes); i++) 116 if (!strcmp(usb_dr_modes[i], str)) 117 return i; 118 119 return USB_DR_MODE_UNKNOWN; 120 } 121 122 enum usb_dr_mode usb_get_dr_mode(struct device *dev) 123 { 124 const char *dr_mode; 125 int err; 126 127 err = device_property_read_string(dev, "dr_mode", &dr_mode); 128 if (err < 0) 129 return USB_DR_MODE_UNKNOWN; 130 131 return usb_get_dr_mode_from_string(dr_mode); 132 } 133 EXPORT_SYMBOL_GPL(usb_get_dr_mode); 134 135 #ifdef CONFIG_OF 136 /** 137 * of_usb_get_dr_mode_by_phy - Get dual role mode for the controller device 138 * which is associated with the given phy device_node 139 * @np: Pointer to the given phy device_node 140 * 141 * In dts a usb controller associates with phy devices. The function gets 142 * the string from property 'dr_mode' of the controller associated with the 143 * given phy device node, and returns the correspondig enum usb_dr_mode. 144 */ 145 enum usb_dr_mode of_usb_get_dr_mode_by_phy(struct device_node *phy_np) 146 { 147 struct device_node *controller = NULL; 148 struct device_node *phy; 149 const char *dr_mode; 150 int index; 151 int err; 152 153 do { 154 controller = of_find_node_with_property(controller, "phys"); 155 index = 0; 156 do { 157 phy = of_parse_phandle(controller, "phys", index); 158 of_node_put(phy); 159 if (phy == phy_np) 160 goto finish; 161 index++; 162 } while (phy); 163 } while (controller); 164 165 finish: 166 err = of_property_read_string(controller, "dr_mode", &dr_mode); 167 of_node_put(controller); 168 169 if (err < 0) 170 return USB_DR_MODE_UNKNOWN; 171 172 return usb_get_dr_mode_from_string(dr_mode); 173 } 174 EXPORT_SYMBOL_GPL(of_usb_get_dr_mode_by_phy); 175 176 /** 177 * of_usb_host_tpl_support - to get if Targeted Peripheral List is supported 178 * for given targeted hosts (non-PC hosts) 179 * @np: Pointer to the given device_node 180 * 181 * The function gets if the targeted hosts support TPL or not 182 */ 183 bool of_usb_host_tpl_support(struct device_node *np) 184 { 185 if (of_find_property(np, "tpl-support", NULL)) 186 return true; 187 188 return false; 189 } 190 EXPORT_SYMBOL_GPL(of_usb_host_tpl_support); 191 192 /** 193 * of_usb_update_otg_caps - to update usb otg capabilities according to 194 * the passed properties in DT. 195 * @np: Pointer to the given device_node 196 * @otg_caps: Pointer to the target usb_otg_caps to be set 197 * 198 * The function updates the otg capabilities 199 */ 200 int of_usb_update_otg_caps(struct device_node *np, 201 struct usb_otg_caps *otg_caps) 202 { 203 u32 otg_rev; 204 205 if (!otg_caps) 206 return -EINVAL; 207 208 if (!of_property_read_u32(np, "otg-rev", &otg_rev)) { 209 switch (otg_rev) { 210 case 0x0100: 211 case 0x0120: 212 case 0x0130: 213 case 0x0200: 214 /* Choose the lesser one if it's already been set */ 215 if (otg_caps->otg_rev) 216 otg_caps->otg_rev = min_t(u16, otg_rev, 217 otg_caps->otg_rev); 218 else 219 otg_caps->otg_rev = otg_rev; 220 break; 221 default: 222 pr_err("%s: unsupported otg-rev: 0x%x\n", 223 np->full_name, otg_rev); 224 return -EINVAL; 225 } 226 } else { 227 /* 228 * otg-rev is mandatory for otg properties, if not passed 229 * we set it to be 0 and assume it's a legacy otg device. 230 * Non-dt platform can set it afterwards. 231 */ 232 otg_caps->otg_rev = 0; 233 } 234 235 if (of_find_property(np, "hnp-disable", NULL)) 236 otg_caps->hnp_support = false; 237 if (of_find_property(np, "srp-disable", NULL)) 238 otg_caps->srp_support = false; 239 if (of_find_property(np, "adp-disable", NULL) || 240 (otg_caps->otg_rev < 0x0200)) 241 otg_caps->adp_support = false; 242 243 return 0; 244 } 245 EXPORT_SYMBOL_GPL(of_usb_update_otg_caps); 246 247 #endif 248 249 MODULE_LICENSE("GPL"); 250