Lan Tianyu | 6e30d7c | 2013-01-11 20:10:38 +0800 | [diff] [blame] | 1 | /* |
| 2 | * usb port device code |
| 3 | * |
| 4 | * Copyright (C) 2012 Intel Corp |
| 5 | * |
| 6 | * Author: Lan Tianyu <tianyu.lan@intel.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, but |
| 13 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| 14 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 15 | * for more details. |
| 16 | * |
| 17 | */ |
| 18 | |
Lan Tianyu | 9f7344f | 2013-01-19 22:30:19 +0800 | [diff] [blame] | 19 | #include <linux/slab.h> |
Lan Tianyu | 971fcd4 | 2013-01-23 04:26:29 +0800 | [diff] [blame] | 20 | #include <linux/pm_qos.h> |
Lan Tianyu | 9f7344f | 2013-01-19 22:30:19 +0800 | [diff] [blame] | 21 | |
Lan Tianyu | 6e30d7c | 2013-01-11 20:10:38 +0800 | [diff] [blame] | 22 | #include "hub.h" |
| 23 | |
Lan Tianyu | cef7468 | 2013-01-20 01:53:32 +0800 | [diff] [blame] | 24 | static const struct attribute_group *port_dev_group[]; |
| 25 | |
| 26 | static ssize_t show_port_connect_type(struct device *dev, |
| 27 | struct device_attribute *attr, char *buf) |
| 28 | { |
| 29 | struct usb_port *port_dev = to_usb_port(dev); |
| 30 | char *result; |
| 31 | |
| 32 | switch (port_dev->connect_type) { |
| 33 | case USB_PORT_CONNECT_TYPE_HOT_PLUG: |
| 34 | result = "hotplug"; |
| 35 | break; |
| 36 | case USB_PORT_CONNECT_TYPE_HARD_WIRED: |
| 37 | result = "hardwired"; |
| 38 | break; |
| 39 | case USB_PORT_NOT_USED: |
| 40 | result = "not used"; |
| 41 | break; |
| 42 | default: |
| 43 | result = "unknown"; |
| 44 | break; |
| 45 | } |
| 46 | |
| 47 | return sprintf(buf, "%s\n", result); |
| 48 | } |
| 49 | static DEVICE_ATTR(connect_type, S_IRUGO, show_port_connect_type, |
| 50 | NULL); |
| 51 | |
| 52 | static struct attribute *port_dev_attrs[] = { |
| 53 | &dev_attr_connect_type.attr, |
| 54 | NULL, |
| 55 | }; |
| 56 | |
| 57 | static struct attribute_group port_dev_attr_grp = { |
| 58 | .attrs = port_dev_attrs, |
| 59 | }; |
| 60 | |
| 61 | static const struct attribute_group *port_dev_group[] = { |
| 62 | &port_dev_attr_grp, |
| 63 | NULL, |
| 64 | }; |
| 65 | |
Lan Tianyu | 6e30d7c | 2013-01-11 20:10:38 +0800 | [diff] [blame] | 66 | static void usb_port_device_release(struct device *dev) |
| 67 | { |
| 68 | struct usb_port *port_dev = to_usb_port(dev); |
| 69 | |
Lan Tianyu | f6cced1 | 2013-01-23 04:26:31 +0800 | [diff] [blame] | 70 | dev_pm_qos_hide_flags(dev); |
Lan Tianyu | 6e30d7c | 2013-01-11 20:10:38 +0800 | [diff] [blame] | 71 | kfree(port_dev); |
| 72 | } |
| 73 | |
Lan Tianyu | 971fcd4 | 2013-01-23 04:26:29 +0800 | [diff] [blame] | 74 | #ifdef CONFIG_USB_SUSPEND |
| 75 | static int usb_port_runtime_resume(struct device *dev) |
| 76 | { |
| 77 | struct usb_port *port_dev = to_usb_port(dev); |
| 78 | struct usb_device *hdev = to_usb_device(dev->parent->parent); |
| 79 | struct usb_interface *intf = to_usb_interface(dev->parent); |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 80 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
| 81 | int port1 = port_dev->portnum; |
Lan Tianyu | 971fcd4 | 2013-01-23 04:26:29 +0800 | [diff] [blame] | 82 | int retval; |
| 83 | |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 84 | if (!hub) |
| 85 | return -EINVAL; |
| 86 | |
Lan Tianyu | 971fcd4 | 2013-01-23 04:26:29 +0800 | [diff] [blame] | 87 | usb_autopm_get_interface(intf); |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 88 | set_bit(port1, hub->busy_bits); |
| 89 | |
| 90 | retval = usb_hub_set_port_power(hdev, port1, true); |
| 91 | if (port_dev->child && !retval) { |
| 92 | /* |
| 93 | * Wait for usb hub port to be reconnected in order to make |
| 94 | * the resume procedure successful. |
| 95 | */ |
| 96 | retval = hub_port_debounce_be_connected(hub, port1); |
| 97 | if (retval < 0) { |
| 98 | dev_dbg(&port_dev->dev, "can't get reconnection after setting port power on, status %d\n", |
| 99 | retval); |
| 100 | goto out; |
| 101 | } |
| 102 | usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE); |
| 103 | |
| 104 | /* Set return value to 0 if debounce successful */ |
| 105 | retval = 0; |
| 106 | } |
| 107 | |
| 108 | out: |
| 109 | clear_bit(port1, hub->busy_bits); |
Lan Tianyu | 971fcd4 | 2013-01-23 04:26:29 +0800 | [diff] [blame] | 110 | usb_autopm_put_interface(intf); |
| 111 | return retval; |
| 112 | } |
| 113 | |
| 114 | static int usb_port_runtime_suspend(struct device *dev) |
| 115 | { |
| 116 | struct usb_port *port_dev = to_usb_port(dev); |
| 117 | struct usb_device *hdev = to_usb_device(dev->parent->parent); |
| 118 | struct usb_interface *intf = to_usb_interface(dev->parent); |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 119 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
| 120 | int port1 = port_dev->portnum; |
Lan Tianyu | 971fcd4 | 2013-01-23 04:26:29 +0800 | [diff] [blame] | 121 | int retval; |
| 122 | |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 123 | if (!hub) |
| 124 | return -EINVAL; |
| 125 | |
Lan Tianyu | 971fcd4 | 2013-01-23 04:26:29 +0800 | [diff] [blame] | 126 | if (dev_pm_qos_flags(&port_dev->dev, PM_QOS_FLAG_NO_POWER_OFF) |
| 127 | == PM_QOS_FLAGS_ALL) |
| 128 | return -EAGAIN; |
| 129 | |
| 130 | usb_autopm_get_interface(intf); |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 131 | set_bit(port1, hub->busy_bits); |
| 132 | retval = usb_hub_set_port_power(hdev, port1, false); |
| 133 | usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION); |
| 134 | usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE); |
| 135 | clear_bit(port1, hub->busy_bits); |
Lan Tianyu | 971fcd4 | 2013-01-23 04:26:29 +0800 | [diff] [blame] | 136 | usb_autopm_put_interface(intf); |
| 137 | return retval; |
| 138 | } |
| 139 | #endif |
| 140 | |
| 141 | static const struct dev_pm_ops usb_port_pm_ops = { |
| 142 | #ifdef CONFIG_USB_SUSPEND |
| 143 | .runtime_suspend = usb_port_runtime_suspend, |
| 144 | .runtime_resume = usb_port_runtime_resume, |
| 145 | .runtime_idle = pm_generic_runtime_idle, |
| 146 | #endif |
| 147 | }; |
| 148 | |
Lan Tianyu | 6e30d7c | 2013-01-11 20:10:38 +0800 | [diff] [blame] | 149 | struct device_type usb_port_device_type = { |
| 150 | .name = "usb_port", |
| 151 | .release = usb_port_device_release, |
Lan Tianyu | 971fcd4 | 2013-01-23 04:26:29 +0800 | [diff] [blame] | 152 | .pm = &usb_port_pm_ops, |
Lan Tianyu | 6e30d7c | 2013-01-11 20:10:38 +0800 | [diff] [blame] | 153 | }; |
| 154 | |
| 155 | int usb_hub_create_port_device(struct usb_hub *hub, int port1) |
| 156 | { |
| 157 | struct usb_port *port_dev = NULL; |
| 158 | int retval; |
| 159 | |
| 160 | port_dev = kzalloc(sizeof(*port_dev), GFP_KERNEL); |
| 161 | if (!port_dev) { |
| 162 | retval = -ENOMEM; |
| 163 | goto exit; |
| 164 | } |
| 165 | |
| 166 | hub->ports[port1 - 1] = port_dev; |
Lan Tianyu | 971fcd4 | 2013-01-23 04:26:29 +0800 | [diff] [blame] | 167 | port_dev->portnum = port1; |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 168 | port_dev->power_is_on = true; |
Lan Tianyu | 6e30d7c | 2013-01-11 20:10:38 +0800 | [diff] [blame] | 169 | port_dev->dev.parent = hub->intfdev; |
Lan Tianyu | cef7468 | 2013-01-20 01:53:32 +0800 | [diff] [blame] | 170 | port_dev->dev.groups = port_dev_group; |
Lan Tianyu | 6e30d7c | 2013-01-11 20:10:38 +0800 | [diff] [blame] | 171 | port_dev->dev.type = &usb_port_device_type; |
| 172 | dev_set_name(&port_dev->dev, "port%d", port1); |
| 173 | |
| 174 | retval = device_register(&port_dev->dev); |
| 175 | if (retval) |
| 176 | goto error_register; |
| 177 | |
Lan Tianyu | 971fcd4 | 2013-01-23 04:26:29 +0800 | [diff] [blame] | 178 | pm_runtime_set_active(&port_dev->dev); |
Lan Tianyu | f6cced1 | 2013-01-23 04:26:31 +0800 | [diff] [blame] | 179 | |
| 180 | /* It would be dangerous if user space couldn't |
| 181 | * prevent usb device from being powered off. So don't |
| 182 | * enable port runtime pm if failed to expose port's pm qos. |
| 183 | */ |
| 184 | if (!dev_pm_qos_expose_flags(&port_dev->dev, |
| 185 | PM_QOS_FLAG_NO_POWER_OFF)) |
| 186 | pm_runtime_enable(&port_dev->dev); |
| 187 | |
Lan Tianyu | 192fef1 | 2013-01-23 04:26:32 +0800 | [diff] [blame] | 188 | device_enable_async_suspend(&port_dev->dev); |
Lan Tianyu | 6e30d7c | 2013-01-11 20:10:38 +0800 | [diff] [blame] | 189 | return 0; |
| 190 | |
| 191 | error_register: |
| 192 | put_device(&port_dev->dev); |
| 193 | exit: |
| 194 | return retval; |
| 195 | } |
| 196 | |
| 197 | void usb_hub_remove_port_device(struct usb_hub *hub, |
| 198 | int port1) |
| 199 | { |
| 200 | device_unregister(&hub->ports[port1 - 1]->dev); |
| 201 | } |
| 202 | |