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