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> |
| 21 | #include "usb.h" |
Alan Stern | b6f6436 | 2007-05-04 11:51:54 -0400 | [diff] [blame^] | 22 | #include "hcd.h" |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 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 | |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 43 | static int choose_configuration(struct usb_device *udev) |
| 44 | { |
| 45 | int i; |
| 46 | int num_configs; |
| 47 | int insufficient_power = 0; |
| 48 | struct usb_host_config *c, *best; |
| 49 | |
| 50 | best = NULL; |
| 51 | c = udev->config; |
| 52 | num_configs = udev->descriptor.bNumConfigurations; |
| 53 | for (i = 0; i < num_configs; (i++, c++)) { |
| 54 | struct usb_interface_descriptor *desc = NULL; |
| 55 | |
| 56 | /* It's possible that a config has no interfaces! */ |
| 57 | if (c->desc.bNumInterfaces > 0) |
| 58 | desc = &c->intf_cache[0]->altsetting->desc; |
| 59 | |
| 60 | /* |
| 61 | * HP's USB bus-powered keyboard has only one configuration |
| 62 | * and it claims to be self-powered; other devices may have |
| 63 | * similar errors in their descriptors. If the next test |
| 64 | * were allowed to execute, such configurations would always |
| 65 | * be rejected and the devices would not work as expected. |
| 66 | * In the meantime, we run the risk of selecting a config |
| 67 | * that requires external power at a time when that power |
| 68 | * isn't available. It seems to be the lesser of two evils. |
| 69 | * |
| 70 | * Bugzilla #6448 reports a device that appears to crash |
| 71 | * when it receives a GET_DEVICE_STATUS request! We don't |
| 72 | * have any other way to tell whether a device is self-powered, |
| 73 | * but since we don't use that information anywhere but here, |
| 74 | * the call has been removed. |
| 75 | * |
| 76 | * Maybe the GET_DEVICE_STATUS call and the test below can |
| 77 | * be reinstated when device firmwares become more reliable. |
| 78 | * Don't hold your breath. |
| 79 | */ |
| 80 | #if 0 |
| 81 | /* Rule out self-powered configs for a bus-powered device */ |
| 82 | if (bus_powered && (c->desc.bmAttributes & |
| 83 | USB_CONFIG_ATT_SELFPOWER)) |
| 84 | continue; |
| 85 | #endif |
| 86 | |
| 87 | /* |
| 88 | * The next test may not be as effective as it should be. |
| 89 | * Some hubs have errors in their descriptor, claiming |
| 90 | * to be self-powered when they are really bus-powered. |
| 91 | * We will overestimate the amount of current such hubs |
| 92 | * make available for each port. |
| 93 | * |
| 94 | * This is a fairly benign sort of failure. It won't |
| 95 | * cause us to reject configurations that we should have |
| 96 | * accepted. |
| 97 | */ |
| 98 | |
| 99 | /* Rule out configs that draw too much bus current */ |
| 100 | if (c->desc.bMaxPower * 2 > udev->bus_mA) { |
| 101 | insufficient_power++; |
| 102 | continue; |
| 103 | } |
| 104 | |
Ole Andre Vadla Ravnas | ad55d71 | 2006-12-14 16:01:28 -0800 | [diff] [blame] | 105 | /* When the first config's first interface is one of Microsoft's |
| 106 | * pet nonstandard Ethernet-over-USB protocols, ignore it unless |
| 107 | * this kernel has enabled the necessary host side driver. |
| 108 | */ |
| 109 | if (i == 0 && desc && (is_rndis(desc) || is_activesync(desc))) { |
| 110 | #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] | 111 | continue; |
| 112 | #else |
| 113 | best = c; |
| 114 | #endif |
| 115 | } |
| 116 | |
| 117 | /* From the remaining configs, choose the first one whose |
| 118 | * first interface is for a non-vendor-specific class. |
| 119 | * Reason: Linux is more likely to have a class driver |
| 120 | * than a vendor-specific driver. */ |
| 121 | else if (udev->descriptor.bDeviceClass != |
| 122 | USB_CLASS_VENDOR_SPEC && |
| 123 | (!desc || desc->bInterfaceClass != |
| 124 | USB_CLASS_VENDOR_SPEC)) { |
| 125 | best = c; |
| 126 | break; |
| 127 | } |
| 128 | |
| 129 | /* If all the remaining configs are vendor-specific, |
| 130 | * choose the first one. */ |
| 131 | else if (!best) |
| 132 | best = c; |
| 133 | } |
| 134 | |
| 135 | if (insufficient_power > 0) |
| 136 | dev_info(&udev->dev, "rejected %d configuration%s " |
| 137 | "due to insufficient available bus power\n", |
| 138 | insufficient_power, plural(insufficient_power)); |
| 139 | |
| 140 | if (best) { |
| 141 | i = best->desc.bConfigurationValue; |
| 142 | dev_info(&udev->dev, |
| 143 | "configuration #%d chosen from %d choice%s\n", |
| 144 | i, num_configs, plural(num_configs)); |
| 145 | } else { |
| 146 | i = -1; |
| 147 | dev_warn(&udev->dev, |
| 148 | "no configuration chosen from %d choice%s\n", |
| 149 | num_configs, plural(num_configs)); |
| 150 | } |
| 151 | return i; |
| 152 | } |
| 153 | |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 154 | static int generic_probe(struct usb_device *udev) |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 155 | { |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 156 | int err, c; |
| 157 | |
| 158 | /* put device-specific files into sysfs */ |
| 159 | usb_create_sysfs_dev_files(udev); |
| 160 | |
| 161 | /* Choose and set the configuration. This registers the interfaces |
| 162 | * with the driver core and lets interface drivers bind to them. |
| 163 | */ |
| 164 | c = choose_configuration(udev); |
| 165 | if (c >= 0) { |
| 166 | err = usb_set_configuration(udev, c); |
| 167 | if (err) { |
| 168 | dev_err(&udev->dev, "can't set config #%d, error %d\n", |
| 169 | c, err); |
| 170 | /* This need not be fatal. The user can try to |
| 171 | * set other configurations. */ |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | /* USB device state == configured ... usable */ |
| 176 | usb_notify_add_device(udev); |
| 177 | |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 178 | return 0; |
| 179 | } |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 180 | |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 181 | static void generic_disconnect(struct usb_device *udev) |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 182 | { |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 183 | usb_notify_remove_device(udev); |
| 184 | |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 185 | /* if this is only an unbind, not a physical disconnect, then |
| 186 | * unconfigure the device */ |
Alan Stern | 01d883d | 2006-08-30 15:47:18 -0400 | [diff] [blame] | 187 | if (udev->actconfig) |
Alan Stern | 3f141e2 | 2007-02-08 16:40:43 -0500 | [diff] [blame] | 188 | usb_set_configuration(udev, -1); |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 189 | |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 190 | usb_remove_sysfs_dev_files(udev); |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 191 | } |
| 192 | |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 193 | #ifdef CONFIG_PM |
| 194 | |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 195 | static int generic_suspend(struct usb_device *udev, pm_message_t msg) |
| 196 | { |
Alan Stern | b6f6436 | 2007-05-04 11:51:54 -0400 | [diff] [blame^] | 197 | int rc; |
| 198 | |
| 199 | rc = usb_port_suspend(udev); |
| 200 | |
| 201 | /* Root hubs don't have upstream ports to suspend, |
| 202 | * so the line above won't do much for them. We have to |
| 203 | * shut down their downstream HC-to-USB interfaces manually, |
| 204 | * by doing a bus (or "global") suspend. |
| 205 | */ |
| 206 | if (rc == 0 && !udev->parent) { |
| 207 | rc = hcd_bus_suspend(udev->bus); |
| 208 | if (rc) { |
| 209 | dev_dbg(&udev->dev, "'global' suspend %d\n", rc); |
| 210 | usb_port_resume(udev); |
| 211 | } |
| 212 | } |
| 213 | return rc; |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 214 | } |
| 215 | |
| 216 | static int generic_resume(struct usb_device *udev) |
| 217 | { |
Alan Stern | b6f6436 | 2007-05-04 11:51:54 -0400 | [diff] [blame^] | 218 | int rc; |
| 219 | |
| 220 | rc = usb_port_resume(udev); |
| 221 | |
| 222 | /* Root hubs don't have upstream ports to resume or reset, |
| 223 | * so the line above won't do much for them. We have to |
| 224 | * start up their downstream HC-to-USB interfaces manually, |
| 225 | * by doing a bus (or "global") resume. |
| 226 | */ |
| 227 | if (rc == 0 && !udev->parent) { |
| 228 | rc = hcd_bus_resume(udev->bus); |
| 229 | if (rc) |
| 230 | dev_dbg(&udev->dev, "'global' resume %d\n", rc); |
| 231 | else { |
| 232 | /* TRSMRCY = 10 msec */ |
| 233 | msleep(10); |
| 234 | } |
| 235 | } |
| 236 | return rc; |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 237 | } |
| 238 | |
| 239 | #endif /* CONFIG_PM */ |
| 240 | |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 241 | struct usb_device_driver usb_generic_driver = { |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 242 | .name = "usb", |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 243 | .probe = generic_probe, |
Alan Stern | 8bb54ab | 2006-07-01 22:08:49 -0400 | [diff] [blame] | 244 | .disconnect = generic_disconnect, |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 245 | #ifdef CONFIG_PM |
| 246 | .suspend = generic_suspend, |
| 247 | .resume = generic_resume, |
| 248 | #endif |
Alan Stern | 01d883d | 2006-08-30 15:47:18 -0400 | [diff] [blame] | 249 | .supports_autosuspend = 1, |
Alan Stern | 36e56a3 | 2006-07-01 22:08:06 -0400 | [diff] [blame] | 250 | }; |