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