| /* |
| * Provides code common for host and device side USB. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation, version 2. |
| * |
| * If either host side (ie. CONFIG_USB=y) or device side USB stack |
| * (ie. CONFIG_USB_GADGET=y) is compiled in the kernel, this module is |
| * compiled-in as well. Otherwise, if either of the two stacks is |
| * compiled as module, this file is compiled as module as well. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/of.h> |
| #include <linux/usb/ch9.h> |
| #include <linux/usb/of.h> |
| #include <linux/usb/otg.h> |
| |
| const char *usb_otg_state_string(enum usb_otg_state state) |
| { |
| static const char *const names[] = { |
| [OTG_STATE_A_IDLE] = "a_idle", |
| [OTG_STATE_A_WAIT_VRISE] = "a_wait_vrise", |
| [OTG_STATE_A_WAIT_BCON] = "a_wait_bcon", |
| [OTG_STATE_A_HOST] = "a_host", |
| [OTG_STATE_A_SUSPEND] = "a_suspend", |
| [OTG_STATE_A_PERIPHERAL] = "a_peripheral", |
| [OTG_STATE_A_WAIT_VFALL] = "a_wait_vfall", |
| [OTG_STATE_A_VBUS_ERR] = "a_vbus_err", |
| [OTG_STATE_B_IDLE] = "b_idle", |
| [OTG_STATE_B_SRP_INIT] = "b_srp_init", |
| [OTG_STATE_B_PERIPHERAL] = "b_peripheral", |
| [OTG_STATE_B_WAIT_ACON] = "b_wait_acon", |
| [OTG_STATE_B_HOST] = "b_host", |
| }; |
| |
| if (state < 0 || state >= ARRAY_SIZE(names)) |
| return "UNDEFINED"; |
| |
| return names[state]; |
| } |
| EXPORT_SYMBOL_GPL(usb_otg_state_string); |
| |
| static const char *const speed_names[] = { |
| [USB_SPEED_UNKNOWN] = "UNKNOWN", |
| [USB_SPEED_LOW] = "low-speed", |
| [USB_SPEED_FULL] = "full-speed", |
| [USB_SPEED_HIGH] = "high-speed", |
| [USB_SPEED_WIRELESS] = "wireless", |
| [USB_SPEED_SUPER] = "super-speed", |
| [USB_SPEED_SUPER_PLUS] = "super-speed-plus", |
| }; |
| |
| const char *usb_speed_string(enum usb_device_speed speed) |
| { |
| if (speed < 0 || speed >= ARRAY_SIZE(speed_names)) |
| speed = USB_SPEED_UNKNOWN; |
| return speed_names[speed]; |
| } |
| EXPORT_SYMBOL_GPL(usb_speed_string); |
| |
| enum usb_device_speed usb_get_maximum_speed(struct device *dev) |
| { |
| const char *maximum_speed; |
| int err; |
| int i; |
| |
| err = device_property_read_string(dev, "maximum-speed", &maximum_speed); |
| if (err < 0) |
| return USB_SPEED_UNKNOWN; |
| |
| for (i = 0; i < ARRAY_SIZE(speed_names); i++) |
| if (strcmp(maximum_speed, speed_names[i]) == 0) |
| return i; |
| |
| return USB_SPEED_UNKNOWN; |
| } |
| EXPORT_SYMBOL_GPL(usb_get_maximum_speed); |
| |
| const char *usb_state_string(enum usb_device_state state) |
| { |
| static const char *const names[] = { |
| [USB_STATE_NOTATTACHED] = "not attached", |
| [USB_STATE_ATTACHED] = "attached", |
| [USB_STATE_POWERED] = "powered", |
| [USB_STATE_RECONNECTING] = "reconnecting", |
| [USB_STATE_UNAUTHENTICATED] = "unauthenticated", |
| [USB_STATE_DEFAULT] = "default", |
| [USB_STATE_ADDRESS] = "addressed", |
| [USB_STATE_CONFIGURED] = "configured", |
| [USB_STATE_SUSPENDED] = "suspended", |
| }; |
| |
| if (state < 0 || state >= ARRAY_SIZE(names)) |
| return "UNKNOWN"; |
| |
| return names[state]; |
| } |
| EXPORT_SYMBOL_GPL(usb_state_string); |
| |
| static const char *const usb_dr_modes[] = { |
| [USB_DR_MODE_UNKNOWN] = "", |
| [USB_DR_MODE_HOST] = "host", |
| [USB_DR_MODE_PERIPHERAL] = "peripheral", |
| [USB_DR_MODE_OTG] = "otg", |
| }; |
| |
| enum usb_dr_mode usb_get_dr_mode(struct device *dev) |
| { |
| const char *dr_mode; |
| int err, i; |
| |
| err = device_property_read_string(dev, "dr_mode", &dr_mode); |
| if (err < 0) |
| return USB_DR_MODE_UNKNOWN; |
| |
| for (i = 0; i < ARRAY_SIZE(usb_dr_modes); i++) |
| if (!strcmp(dr_mode, usb_dr_modes[i])) |
| return i; |
| |
| return USB_DR_MODE_UNKNOWN; |
| } |
| EXPORT_SYMBOL_GPL(usb_get_dr_mode); |
| |
| #ifdef CONFIG_OF |
| /** |
| * of_usb_host_tpl_support - to get if Targeted Peripheral List is supported |
| * for given targeted hosts (non-PC hosts) |
| * @np: Pointer to the given device_node |
| * |
| * The function gets if the targeted hosts support TPL or not |
| */ |
| bool of_usb_host_tpl_support(struct device_node *np) |
| { |
| if (of_find_property(np, "tpl-support", NULL)) |
| return true; |
| |
| return false; |
| } |
| EXPORT_SYMBOL_GPL(of_usb_host_tpl_support); |
| |
| /** |
| * of_usb_update_otg_caps - to update usb otg capabilities according to |
| * the passed properties in DT. |
| * @np: Pointer to the given device_node |
| * @otg_caps: Pointer to the target usb_otg_caps to be set |
| * |
| * The function updates the otg capabilities |
| */ |
| int of_usb_update_otg_caps(struct device_node *np, |
| struct usb_otg_caps *otg_caps) |
| { |
| u32 otg_rev; |
| |
| if (!otg_caps) |
| return -EINVAL; |
| |
| if (!of_property_read_u32(np, "otg-rev", &otg_rev)) { |
| switch (otg_rev) { |
| case 0x0100: |
| case 0x0120: |
| case 0x0130: |
| case 0x0200: |
| /* Choose the lesser one if it's already been set */ |
| if (otg_caps->otg_rev) |
| otg_caps->otg_rev = min_t(u16, otg_rev, |
| otg_caps->otg_rev); |
| else |
| otg_caps->otg_rev = otg_rev; |
| break; |
| default: |
| pr_err("%s: unsupported otg-rev: 0x%x\n", |
| np->full_name, otg_rev); |
| return -EINVAL; |
| } |
| } else { |
| /* |
| * otg-rev is mandatory for otg properties, if not passed |
| * we set it to be 0 and assume it's a legacy otg device. |
| * Non-dt platform can set it afterwards. |
| */ |
| otg_caps->otg_rev = 0; |
| } |
| |
| if (of_find_property(np, "hnp-disable", NULL)) |
| otg_caps->hnp_support = false; |
| if (of_find_property(np, "srp-disable", NULL)) |
| otg_caps->srp_support = false; |
| if (of_find_property(np, "adp-disable", NULL) || |
| (otg_caps->otg_rev < 0x0200)) |
| otg_caps->adp_support = false; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(of_usb_update_otg_caps); |
| |
| #endif |
| |
| MODULE_LICENSE("GPL"); |