2 * Provides code common for host and device side USB.
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.
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.
14 #include <linux/kernel.h>
15 #include <linux/module.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>
22 const char *usb_otg_state_string(enum usb_otg_state state)
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",
40 if (state < 0 || state >= ARRAY_SIZE(names))
45 EXPORT_SYMBOL_GPL(usb_otg_state_string);
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",
57 const char *usb_speed_string(enum usb_device_speed speed)
59 if (speed < 0 || speed >= ARRAY_SIZE(speed_names))
60 speed = USB_SPEED_UNKNOWN;
61 return speed_names[speed];
63 EXPORT_SYMBOL_GPL(usb_speed_string);
65 enum usb_device_speed usb_get_maximum_speed(struct device *dev)
67 const char *maximum_speed;
71 err = device_property_read_string(dev, "maximum-speed", &maximum_speed);
73 return USB_SPEED_UNKNOWN;
75 for (i = 0; i < ARRAY_SIZE(speed_names); i++)
76 if (strcmp(maximum_speed, speed_names[i]) == 0)
79 return USB_SPEED_UNKNOWN;
81 EXPORT_SYMBOL_GPL(usb_get_maximum_speed);
83 const char *usb_state_string(enum usb_device_state state)
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",
97 if (state < 0 || state >= ARRAY_SIZE(names))
102 EXPORT_SYMBOL_GPL(usb_state_string);
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",
111 static enum usb_dr_mode usb_get_dr_mode_from_string(const char *str)
115 for (i = 0; i < ARRAY_SIZE(usb_dr_modes); i++)
116 if (!strcmp(usb_dr_modes[i], str))
119 return USB_DR_MODE_UNKNOWN;
122 enum usb_dr_mode usb_get_dr_mode(struct device *dev)
127 err = device_property_read_string(dev, "dr_mode", &dr_mode);
129 return USB_DR_MODE_UNKNOWN;
131 return usb_get_dr_mode_from_string(dr_mode);
133 EXPORT_SYMBOL_GPL(usb_get_dr_mode);
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 * @arg0: phandle args[0] for phy's with #phy-cells >= 1, or -1 for
141 * phys which do not have phy-cells
143 * In dts a usb controller associates with phy devices. The function gets
144 * the string from property 'dr_mode' of the controller associated with the
145 * given phy device node, and returns the correspondig enum usb_dr_mode.
147 enum usb_dr_mode of_usb_get_dr_mode_by_phy(struct device_node *np, int arg0)
149 struct device_node *controller = NULL;
150 struct of_phandle_args args;
156 controller = of_find_node_with_property(controller, "phys");
160 args.np = of_parse_phandle(controller, "phys",
164 err = of_parse_phandle_with_args(controller,
165 "phys", "#phy-cells",
171 of_node_put(args.np);
172 if (args.np == np && (args.args_count == 0 ||
173 args.args[0] == arg0))
177 } while (controller);
180 err = of_property_read_string(controller, "dr_mode", &dr_mode);
181 of_node_put(controller);
184 return USB_DR_MODE_UNKNOWN;
186 return usb_get_dr_mode_from_string(dr_mode);
188 EXPORT_SYMBOL_GPL(of_usb_get_dr_mode_by_phy);
191 * of_usb_host_tpl_support - to get if Targeted Peripheral List is supported
192 * for given targeted hosts (non-PC hosts)
193 * @np: Pointer to the given device_node
195 * The function gets if the targeted hosts support TPL or not
197 bool of_usb_host_tpl_support(struct device_node *np)
199 if (of_find_property(np, "tpl-support", NULL))
204 EXPORT_SYMBOL_GPL(of_usb_host_tpl_support);
207 * of_usb_update_otg_caps - to update usb otg capabilities according to
208 * the passed properties in DT.
209 * @np: Pointer to the given device_node
210 * @otg_caps: Pointer to the target usb_otg_caps to be set
212 * The function updates the otg capabilities
214 int of_usb_update_otg_caps(struct device_node *np,
215 struct usb_otg_caps *otg_caps)
222 if (!of_property_read_u32(np, "otg-rev", &otg_rev)) {
228 /* Choose the lesser one if it's already been set */
229 if (otg_caps->otg_rev)
230 otg_caps->otg_rev = min_t(u16, otg_rev,
233 otg_caps->otg_rev = otg_rev;
236 pr_err("%s: unsupported otg-rev: 0x%x\n",
237 np->full_name, otg_rev);
242 * otg-rev is mandatory for otg properties, if not passed
243 * we set it to be 0 and assume it's a legacy otg device.
244 * Non-dt platform can set it afterwards.
246 otg_caps->otg_rev = 0;
249 if (of_find_property(np, "hnp-disable", NULL))
250 otg_caps->hnp_support = false;
251 if (of_find_property(np, "srp-disable", NULL))
252 otg_caps->srp_support = false;
253 if (of_find_property(np, "adp-disable", NULL) ||
254 (otg_caps->otg_rev < 0x0200))
255 otg_caps->adp_support = false;
259 EXPORT_SYMBOL_GPL(of_usb_update_otg_caps);
263 MODULE_LICENSE("GPL");