1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * usb hub driver head file 4 * 5 * Copyright (C) 1999 Linus Torvalds 6 * Copyright (C) 1999 Johannes Erdfelt 7 * Copyright (C) 1999 Gregory P. Smith 8 * Copyright (C) 2001 Brad Hards (bhards@bigpond.net.au) 9 * Copyright (C) 2012 Intel Corp (tianyu.lan@intel.com) 10 * 11 * move struct usb_hub to this file. 12 */ 13 14 #include <linux/usb.h> 15 #include <linux/usb/ch11.h> 16 #include <linux/usb/hcd.h> 17 #include <linux/usb/typec.h> 18 #include "usb.h" 19 20 struct usb_hub { 21 struct device *intfdev; /* the "interface" device */ 22 struct usb_device *hdev; 23 struct kref kref; 24 struct urb *urb; /* for interrupt polling pipe */ 25 26 /* buffer for urb ... with extra space in case of babble */ 27 u8 (*buffer)[8]; 28 union { 29 struct usb_hub_status hub; 30 struct usb_port_status port; 31 } *status; /* buffer for status reports */ 32 struct mutex status_mutex; /* for the status buffer */ 33 34 int error; /* last reported error */ 35 int nerrors; /* track consecutive errors */ 36 37 unsigned long event_bits[1]; /* status change bitmask */ 38 unsigned long change_bits[1]; /* ports with logical connect 39 status change */ 40 unsigned long removed_bits[1]; /* ports with a "removed" 41 device present */ 42 unsigned long wakeup_bits[1]; /* ports that have signaled 43 remote wakeup */ 44 unsigned long power_bits[1]; /* ports that are powered */ 45 unsigned long child_usage_bits[1]; /* ports powered on for 46 children */ 47 unsigned long warm_reset_bits[1]; /* ports requesting warm 48 reset recovery */ 49 #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */ 50 #error event_bits[] is too short! 51 #endif 52 53 struct usb_hub_descriptor *descriptor; /* class descriptor */ 54 struct usb_tt tt; /* Transaction Translator */ 55 56 unsigned mA_per_port; /* current for each child */ 57 #ifdef CONFIG_PM 58 unsigned wakeup_enabled_descendants; 59 #endif 60 61 unsigned limited_power:1; 62 unsigned quiescing:1; 63 unsigned disconnected:1; 64 unsigned in_reset:1; 65 unsigned quirk_disable_autosuspend:1; 66 67 unsigned quirk_check_port_auto_suspend:1; 68 69 unsigned has_indicators:1; 70 u8 indicator[USB_MAXCHILDREN]; 71 struct delayed_work leds; 72 struct delayed_work init_work; 73 struct work_struct events; 74 spinlock_t irq_urb_lock; 75 struct timer_list irq_urb_retry; 76 struct usb_port **ports; 77 struct list_head onboard_devs; 78 }; 79 80 /** 81 * struct usb port - kernel's representation of a usb port 82 * @child: usb device attached to the port 83 * @dev: generic device interface 84 * @port_owner: port's owner 85 * @peer: related usb2 and usb3 ports (share the same connector) 86 * @connector: USB Type-C connector 87 * @req: default pm qos request for hubs without port power control 88 * @connect_type: port's connect type 89 * @state: device state of the usb device attached to the port 90 * @state_kn: kernfs_node of the sysfs attribute that accesses @state 91 * @location: opaque representation of platform connector location 92 * @status_lock: synchronize port_event() vs usb_port_{suspend|resume} 93 * @portnum: port index num based one 94 * @is_superspeed cache super-speed status 95 * @usb3_lpm_u1_permit: whether USB3 U1 LPM is permitted. 96 * @usb3_lpm_u2_permit: whether USB3 U2 LPM is permitted. 97 * @early_stop: whether port initialization will be stopped earlier. 98 * @ignore_event: whether events of the port are ignored. 99 */ 100 struct usb_port { 101 struct usb_device *child; 102 struct device dev; 103 struct usb_dev_state *port_owner; 104 struct usb_port *peer; 105 struct typec_connector *connector; 106 struct dev_pm_qos_request *req; 107 enum usb_port_connect_type connect_type; 108 enum usb_device_state state; 109 struct kernfs_node *state_kn; 110 usb_port_location_t location; 111 struct mutex status_lock; 112 u32 over_current_count; 113 u8 portnum; 114 u32 quirks; 115 unsigned int early_stop:1; 116 unsigned int ignore_event:1; 117 unsigned int is_superspeed:1; 118 unsigned int usb3_lpm_u1_permit:1; 119 unsigned int usb3_lpm_u2_permit:1; 120 }; 121 122 #define to_usb_port(_dev) \ 123 container_of(_dev, struct usb_port, dev) 124 125 extern int usb_hub_create_port_device(struct usb_hub *hub, 126 int port1); 127 extern void usb_hub_remove_port_device(struct usb_hub *hub, 128 int port1); 129 extern int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub, 130 int port1, bool set); 131 extern struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev); 132 extern void hub_get(struct usb_hub *hub); 133 extern void hub_put(struct usb_hub *hub); 134 extern int hub_port_debounce(struct usb_hub *hub, int port1, 135 bool must_be_connected); 136 extern int usb_clear_port_feature(struct usb_device *hdev, 137 int port1, int feature); 138 extern int usb_hub_port_status(struct usb_hub *hub, int port1, 139 u16 *status, u16 *change); 140 extern int usb_port_is_power_on(struct usb_hub *hub, unsigned int portstatus); 141 hub_is_port_power_switchable(struct usb_hub * hub)142 static inline bool hub_is_port_power_switchable(struct usb_hub *hub) 143 { 144 __le16 hcs; 145 146 if (!hub) 147 return false; 148 hcs = hub->descriptor->wHubCharacteristics; 149 return (le16_to_cpu(hcs) & HUB_CHAR_LPSM) < HUB_CHAR_NO_LPSM; 150 } 151 hub_is_superspeed(struct usb_device * hdev)152 static inline int hub_is_superspeed(struct usb_device *hdev) 153 { 154 return hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS; 155 } 156 hub_is_superspeedplus(struct usb_device * hdev)157 static inline int hub_is_superspeedplus(struct usb_device *hdev) 158 { 159 return (hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS && 160 le16_to_cpu(hdev->descriptor.bcdUSB) >= 0x0310 && 161 hdev->bos && hdev->bos->ssp_cap); 162 } 163 hub_power_on_good_delay(struct usb_hub * hub)164 static inline unsigned hub_power_on_good_delay(struct usb_hub *hub) 165 { 166 unsigned delay = hub->descriptor->bPwrOn2PwrGood * 2; 167 168 if (!hub->hdev->parent) /* root hub */ 169 return delay; 170 else /* Wait at least 100 msec for power to become stable */ 171 return max(delay, 100U); 172 } 173 hub_port_debounce_be_connected(struct usb_hub * hub,int port1)174 static inline int hub_port_debounce_be_connected(struct usb_hub *hub, 175 int port1) 176 { 177 return hub_port_debounce(hub, port1, true); 178 } 179 hub_port_debounce_be_stable(struct usb_hub * hub,int port1)180 static inline int hub_port_debounce_be_stable(struct usb_hub *hub, 181 int port1) 182 { 183 return hub_port_debounce(hub, port1, false); 184 } 185