Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 1 | /* |
| 2 | * drivers/usb/generic.c - generic driver for USB devices (not interfaces) |
| 3 | * |
| 4 | * (C) Copyright 2005 Greg Kroah-Hartman <gregkh@suse.de> |
| 5 | * |
| 6 | * based on drivers/usb/usb.c which had the following copyrights: |
| 7 | * (C) Copyright Linus Torvalds 1999 |
| 8 | * (C) Copyright Johannes Erdfelt 1999-2001 |
| 9 | * (C) Copyright Andreas Gal 1999 |
| 10 | * (C) Copyright Gregory P. Smith 1999 |
| 11 | * (C) Copyright Deti Fliegl 1999 (new USB architecture) |
| 12 | * (C) Copyright Randy Dunlap 2000 |
| 13 | * (C) Copyright David Brownell 2000-2004 |
| 14 | * (C) Copyright Yggdrasil Computing, Inc. 2000 |
| 15 | * (usb_device_id matching changes by Adam J. Richter) |
| 16 | * (C) Copyright Greg Kroah-Hartman 2002-2003 |
| 17 | * |
| 18 | */ |
| 19 | |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 20 | #include <linux/usb.h> |
Eric Lescouet | 27729aa | 2010-04-24 23:21:52 +0200 | [diff] [blame] | 21 | #include <linux/usb/hcd.h> |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 22 | #include "usb.h" |
| 23 | |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 24 | static inline const char *plural(int n) |
| 25 | { |
| 26 | return (n == 1 ? "" : "s"); |
| 27 | } |
| 28 | |
Ole Andre Vadla Ravnas | ad55d71 | 2006-12-14 16:01:28 -0800 | [diff] [blame] | 29 | static int is_rndis(struct usb_interface_descriptor *desc) |
| 30 | { |
| 31 | return desc->bInterfaceClass == USB_CLASS_COMM |
| 32 | && desc->bInterfaceSubClass == 2 |
| 33 | && desc->bInterfaceProtocol == 0xff; |
| 34 | } |
| 35 | |
| 36 | static int is_activesync(struct usb_interface_descriptor *desc) |
| 37 | { |
| 38 | return desc->bInterfaceClass == USB_CLASS_MISC |
| 39 | && desc->bInterfaceSubClass == 1 |
| 40 | && desc->bInterfaceProtocol == 1; |
| 41 | } |
| 42 | |
Greg Kroah-Hartman | b5ea060 | 2007-08-02 22:44:27 -0600 | [diff] [blame] | 43 | int usb_choose_configuration(struct usb_device *udev) |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 44 | { |
| 45 | int i; |
| 46 | int num_configs; |
| 47 | int insufficient_power = 0; |
| 48 | struct usb_host_config *c, *best; |
| 49 | |
Hindin Joseph | c13b86a | 2012-11-04 22:50:08 +0200 | [diff] [blame] | 50 | if (usb_device_is_owned(udev)) |
| 51 | return 0; |
| 52 | |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 53 | best = NULL; |
| 54 | c = udev->config; |
| 55 | num_configs = udev->descriptor.bNumConfigurations; |
| 56 | for (i = 0; i < num_configs; (i++, c++)) { |
| 57 | struct usb_interface_descriptor *desc = NULL; |
| 58 | |
| 59 | /* It's possible that a config has no interfaces! */ |
| 60 | if (c->desc.bNumInterfaces > 0) |
| 61 | desc = &c->intf_cache[0]->altsetting->desc; |
| 62 | |
| 63 | /* |
| 64 | * HP's USB bus-powered keyboard has only one configuration |
| 65 | * and it claims to be self-powered; other devices may have |
| 66 | * similar errors in their descriptors. If the next test |
| 67 | * were allowed to execute, such configurations would always |
| 68 | * be rejected and the devices would not work as expected. |
| 69 | * In the meantime, we run the risk of selecting a config |
| 70 | * that requires external power at a time when that power |
| 71 | * isn't available. It seems to be the lesser of two evils. |
| 72 | * |
| 73 | * Bugzilla #6448 reports a device that appears to crash |
| 74 | * when it receives a GET_DEVICE_STATUS request! We don't |
| 75 | * have any other way to tell whether a device is self-powered, |
| 76 | * but since we don't use that information anywhere but here, |
| 77 | * the call has been removed. |
| 78 | * |
| 79 | * Maybe the GET_DEVICE_STATUS call and the test below can |
| 80 | * be reinstated when device firmwares become more reliable. |
| 81 | * Don't hold your breath. |
| 82 | */ |
| 83 | #if 0 |
| 84 | /* Rule out self-powered configs for a bus-powered device */ |
| 85 | if (bus_powered && (c->desc.bmAttributes & |
| 86 | USB_CONFIG_ATT_SELFPOWER)) |
| 87 | continue; |
| 88 | #endif |
| 89 | |
| 90 | /* |
| 91 | * The next test may not be as effective as it should be. |
| 92 | * Some hubs have errors in their descriptor, claiming |
| 93 | * to be self-powered when they are really bus-powered. |
| 94 | * We will overestimate the amount of current such hubs |
| 95 | * make available for each port. |
| 96 | * |
| 97 | * This is a fairly benign sort of failure. It won't |
| 98 | * cause us to reject configurations that we should have |
| 99 | * accepted. |
| 100 | */ |
| 101 | |
| 102 | /* Rule out configs that draw too much bus current */ |
Sebastian Andrzej Siewior | 8d8479d | 2012-12-18 15:25:46 +0100 | [diff] [blame] | 103 | if (usb_get_max_power(udev, c) > udev->bus_mA) { |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 104 | insufficient_power++; |
| 105 | continue; |
| 106 | } |
| 107 | |
Ole Andre Vadla Ravnas | ad55d71 | 2006-12-14 16:01:28 -0800 | [diff] [blame] | 108 | /* When the first config's first interface is one of Microsoft's |
| 109 | * pet nonstandard Ethernet-over-USB protocols, ignore it unless |
| 110 | * this kernel has enabled the necessary host side driver. |
Alan Stern | c4e0b50 | 2010-07-27 11:28:42 -0400 | [diff] [blame] | 111 | * But: Don't ignore it if it's the only config. |
Ole Andre Vadla Ravnas | ad55d71 | 2006-12-14 16:01:28 -0800 | [diff] [blame] | 112 | */ |
Alan Stern | c4e0b50 | 2010-07-27 11:28:42 -0400 | [diff] [blame] | 113 | if (i == 0 && num_configs > 1 && desc && |
| 114 | (is_rndis(desc) || is_activesync(desc))) { |
Ole Andre Vadla Ravnas | ad55d71 | 2006-12-14 16:01:28 -0800 | [diff] [blame] | 115 | #if !defined(CONFIG_USB_NET_RNDIS_HOST) && !defined(CONFIG_USB_NET_RNDIS_HOST_MODULE) |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 116 | continue; |
| 117 | #else |
| 118 | best = c; |
| 119 | #endif |
| 120 | } |
| 121 | |
| 122 | /* From the remaining configs, choose the first one whose |
| 123 | * first interface is for a non-vendor-specific class. |
| 124 | * Reason: Linux is more likely to have a class driver |
| 125 | * than a vendor-specific driver. */ |
| 126 | else if (udev->descriptor.bDeviceClass != |
| 127 | USB_CLASS_VENDOR_SPEC && |
Alan Stern | 62f9cfa | 2010-04-20 10:40:59 -0400 | [diff] [blame] | 128 | (desc && desc->bInterfaceClass != |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 129 | USB_CLASS_VENDOR_SPEC)) { |
| 130 | best = c; |
| 131 | break; |
| 132 | } |
| 133 | |
| 134 | /* If all the remaining configs are vendor-specific, |
| 135 | * choose the first one. */ |
| 136 | else if (!best) |
| 137 | best = c; |
| 138 | } |
| 139 | |
| 140 | if (insufficient_power > 0) |
| 141 | dev_info(&udev->dev, "rejected %d configuration%s " |
| 142 | "due to insufficient available bus power\n", |
| 143 | insufficient_power, plural(insufficient_power)); |
| 144 | |
| 145 | if (best) { |
| 146 | i = best->desc.bConfigurationValue; |
Matthew Wilcox | b1f0a34 | 2009-09-24 16:18:27 -0600 | [diff] [blame] | 147 | dev_dbg(&udev->dev, |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 148 | "configuration #%d chosen from %d choice%s\n", |
| 149 | i, num_configs, plural(num_configs)); |
| 150 | } else { |
| 151 | i = -1; |
| 152 | dev_warn(&udev->dev, |
| 153 | "no configuration chosen from %d choice%s\n", |
| 154 | num_configs, plural(num_configs)); |
| 155 | } |
| 156 | return i; |
| 157 | } |
Valentina Manea | b7945b7 | 2014-01-23 23:12:29 +0200 | [diff] [blame^] | 158 | EXPORT_SYMBOL_GPL(usb_choose_configuration); |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 159 | |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 160 | static int generic_probe(struct usb_device *udev) |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 161 | { |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 162 | int err, c; |
| 163 | |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 164 | /* Choose and set the configuration. This registers the interfaces |
| 165 | * with the driver core and lets interface drivers bind to them. |
| 166 | */ |
Hindin Joseph | c13b86a | 2012-11-04 22:50:08 +0200 | [diff] [blame] | 167 | if (udev->authorized == 0) |
Inaky Perez-Gonzalez | f8a3746 | 2007-07-31 20:34:04 -0700 | [diff] [blame] | 168 | dev_err(&udev->dev, "Device is not authorized for usage\n"); |
| 169 | else { |
Greg Kroah-Hartman | b5ea060 | 2007-08-02 22:44:27 -0600 | [diff] [blame] | 170 | c = usb_choose_configuration(udev); |
Inaky Perez-Gonzalez | f8a3746 | 2007-07-31 20:34:04 -0700 | [diff] [blame] | 171 | if (c >= 0) { |
| 172 | err = usb_set_configuration(udev, c); |
Alan Stern | e9e88fb | 2013-03-27 16:14:01 -0400 | [diff] [blame] | 173 | if (err && err != -ENODEV) { |
Inaky Perez-Gonzalez | f8a3746 | 2007-07-31 20:34:04 -0700 | [diff] [blame] | 174 | dev_err(&udev->dev, "can't set config #%d, error %d\n", |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 175 | c, err); |
Inaky Perez-Gonzalez | f8a3746 | 2007-07-31 20:34:04 -0700 | [diff] [blame] | 176 | /* This need not be fatal. The user can try to |
| 177 | * set other configurations. */ |
| 178 | } |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 179 | } |
| 180 | } |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 181 | /* USB device state == configured ... usable */ |
| 182 | usb_notify_add_device(udev); |
| 183 | |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 184 | return 0; |
| 185 | } |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 186 | |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 187 | static void generic_disconnect(struct usb_device *udev) |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 188 | { |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 189 | usb_notify_remove_device(udev); |
| 190 | |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 191 | /* if this is only an unbind, not a physical disconnect, then |
| 192 | * unconfigure the device */ |
Alan Stern | 01d883d | 2006-08-30 15:47:18 -0400 | [diff] [blame] | 193 | if (udev->actconfig) |
Alan Stern | 3f141e2 | 2007-02-08 16:40:43 -0500 | [diff] [blame] | 194 | usb_set_configuration(udev, -1); |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 195 | } |
| 196 | |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 197 | #ifdef CONFIG_PM |
| 198 | |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 199 | static int generic_suspend(struct usb_device *udev, pm_message_t msg) |
| 200 | { |
Alan Stern | b6f6436 | 2007-05-04 11:51:54 -0400 | [diff] [blame] | 201 | int rc; |
| 202 | |
Alan Stern | 686314c | 2007-05-30 15:34:36 -0400 | [diff] [blame] | 203 | /* Normal USB devices suspend through their upstream port. |
| 204 | * Root hubs don't have upstream ports to suspend, |
| 205 | * so we have to shut down their downstream HC-to-USB |
| 206 | * interfaces manually by doing a bus (or "global") suspend. |
Alan Stern | b6f6436 | 2007-05-04 11:51:54 -0400 | [diff] [blame] | 207 | */ |
Alan Stern | 686314c | 2007-05-30 15:34:36 -0400 | [diff] [blame] | 208 | if (!udev->parent) |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 209 | rc = hcd_bus_suspend(udev, msg); |
Alan Stern | 5ad4f71 | 2007-09-10 11:31:43 -0400 | [diff] [blame] | 210 | |
| 211 | /* Non-root devices don't need to do anything for FREEZE or PRETHAW */ |
| 212 | else if (msg.event == PM_EVENT_FREEZE || msg.event == PM_EVENT_PRETHAW) |
| 213 | rc = 0; |
Alan Stern | 686314c | 2007-05-30 15:34:36 -0400 | [diff] [blame] | 214 | else |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 215 | rc = usb_port_suspend(udev, msg); |
Alan Stern | 5ad4f71 | 2007-09-10 11:31:43 -0400 | [diff] [blame] | 216 | |
Alan Stern | b6f6436 | 2007-05-04 11:51:54 -0400 | [diff] [blame] | 217 | return rc; |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 218 | } |
| 219 | |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 220 | static int generic_resume(struct usb_device *udev, pm_message_t msg) |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 221 | { |
Alan Stern | b6f6436 | 2007-05-04 11:51:54 -0400 | [diff] [blame] | 222 | int rc; |
| 223 | |
Alan Stern | 686314c | 2007-05-30 15:34:36 -0400 | [diff] [blame] | 224 | /* Normal USB devices resume/reset through their upstream port. |
| 225 | * Root hubs don't have upstream ports to resume or reset, |
| 226 | * so we have to start up their downstream HC-to-USB |
| 227 | * interfaces manually by doing a bus (or "global") resume. |
| 228 | */ |
| 229 | if (!udev->parent) |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 230 | rc = hcd_bus_resume(udev, msg); |
Alan Stern | 0458d5b | 2007-05-04 11:52:20 -0400 | [diff] [blame] | 231 | else |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 232 | rc = usb_port_resume(udev, msg); |
Alan Stern | b6f6436 | 2007-05-04 11:51:54 -0400 | [diff] [blame] | 233 | return rc; |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 234 | } |
| 235 | |
| 236 | #endif /* CONFIG_PM */ |
| 237 | |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 238 | struct usb_device_driver usb_generic_driver = { |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 239 | .name = "usb", |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 240 | .probe = generic_probe, |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 241 | .disconnect = generic_disconnect, |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 242 | #ifdef CONFIG_PM |
| 243 | .suspend = generic_suspend, |
| 244 | .resume = generic_resume, |
| 245 | #endif |
Alan Stern | 01d883d | 2006-08-30 15:47:18 -0400 | [diff] [blame] | 246 | .supports_autosuspend = 1, |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 247 | }; |