/* * devices.c * (C) Copyright 1999 Randy Dunlap. * (C) Copyright 1999,2000 Thomas Sailer <sailer@ife.ee.ethz.ch>. *     (proc file per device) * (C) Copyright 1999 Deti Fliegl (new USB architecture) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA * ************************************************************* * * <mountpoint>/devices contains USB topology, device, config, class, * interface, & endpoint data. * * I considered using /proc/bus/usb/devices/device# for each device * as it is attached or detached, but I didn't like this for some * reason -- maybe it's just too deep of a directory structure. * I also don't like looking in multiple places to gather and view * the data.  Having only one file for ./devices also prevents race * conditions that could arise if a program was reading device info * for devices that are being removed (unplugged).  (That is, the * program may find a directory for devnum_12 then try to open it, * but it was just unplugged, so the directory is now deleted. * But programs would just have to be prepared for situations like * this in any plug-and-play environment.) * * 1999-12-16: Thomas Sailer <sailer@ife.ee.ethz.ch> *   Converted the whole proc stuff to real *   read methods. Now not the whole device list needs to fit *   into one page, only the device list for one bus. *   Added a poll method to /proc/bus/usb/devices, to wake *   up an eventual usbd * 2000-01-04: Thomas Sailer <sailer@ife.ee.ethz.ch> *   Turned into its own filesystem * 2000-07-05: Ashley Montanaro <ashley@compsoc.man.ac.uk> *   Converted file reading routine to dump to buffer once *   per device, not per bus */ #include <linux/fs.h>#include <linux/mm.h>#include <linux/gfp.h>#include <linux/poll.h>#include <linux/usb.h>#include <linux/usbdevice_fs.h>#include <linux/usb/hcd.h>#include <linux/mutex.h>#include <linux/uaccess.h> #include "usb.h" /* Define ALLOW_SERIAL_NUMBER if you want to see the serial number of devices */#define ALLOW_SERIAL_NUMBER static const char format_topo[] =/* T:  Bus=dd Lev=dd Prnt=dd Port=dd Cnt=dd Dev#=ddd Spd=dddd MxCh=dd */"\nT:  Bus=%2.2d Lev=%2.2d Prnt=%2.2d Port=%2.2d Cnt=%2.2d Dev#=%3d Spd=%-4s MxCh=%2d\n"; static const char format_string_manufacturer[] =/* S:  Manufacturer=xxxx */  "S:  Manufacturer=%.100s\n"; static const char format_string_product[] =/* S:  Product=xxxx */  "S:  Product=%.100s\n"; #ifdef ALLOW_SERIAL_NUMBERstatic const char format_string_serialnumber[] =/* S:  SerialNumber=xxxx */  "S:  SerialNumber=%.100s\n";#endif static const char format_bandwidth[] =/* B:  Alloc=ddd/ddd us (xx%), #Int=ddd, #Iso=ddd */  "B:  Alloc=%3d/%3d us (%2d%%), #Int=%3d, #Iso=%3d\n"; static const char format_device1[] =/* D:  Ver=xx.xx Cls=xx(sssss) Sub=xx Prot=xx MxPS=dd #Cfgs=dd */  "D:  Ver=%2x.%02x Cls=%02x(%-5s) Sub=%02x Prot=%02x MxPS=%2d #Cfgs=%3d\n"; static const char format_device2[] =/* P:  Vendor=xxxx ProdID=xxxx Rev=xx.xx */  "P:  Vendor=%04x ProdID=%04x Rev=%2x.%02x\n"; static const char format_config[] =/* C:  #Ifs=dd Cfg#=dd Atr=xx MPwr=dddmA */  "C:%c #Ifs=%2d Cfg#=%2d Atr=%02x MxPwr=%3dmA\n"; static const char format_iad[] =/* A:  FirstIf#=dd IfCount=dd Cls=xx(sssss) Sub=xx Prot=xx */  "A:  FirstIf#=%2d IfCount=%2d Cls=%02x(%-5s) Sub=%02x Prot=%02x\n"; static const char format_iface[] =/* I:  If#=dd Alt=dd #EPs=dd Cls=xx(sssss) Sub=xx Prot=xx Driver=xxxx*/  "I:%c If#=%2d Alt=%2d #EPs=%2d Cls=%02x(%-5s) Sub=%02x Prot=%02x Driver=%s\n"; static const char format_endpt[] =/* E:  Ad=xx(s) Atr=xx(ssss) MxPS=dddd Ivl=D?s */  "E:  Ad=%02x(%c) Atr=%02x(%-4s) MxPS=%4d Ivl=%d%cs\n";  /* * Need access to the driver and USB bus lists. * extern struct list_head usb_bus_list; * However, these will come from functions that return ptrs to each of them. */ /* * Wait for an connect/disconnect event to happen. We initialize * the event counter with an odd number, and each event will increment * the event counter by two, so it will always _stay_ odd. That means * that it will never be zero, so "event 0" will never match a current * event, and thus 'poll' will always trigger as readable for the first * time it gets called. */static struct device_connect_event {	atomic_t count;	wait_queue_head_t wait;} device_event = {	.count = ATOMIC_INIT(1),	.wait = __WAIT_QUEUE_HEAD_INITIALIZER(device_event.wait)}; struct class_info {	int class;	char *class_name;}; static const struct class_info clas_info[] = {	/* max. 5 chars. per name string */	{USB_CLASS_PER_INTERFACE,	">ifc"},	{USB_CLASS_AUDIO,		"audio"},	{USB_CLASS_COMM,		"comm."},	{USB_CLASS_HID,			"HID"},	{USB_CLASS_PHYSICAL,		"PID"},	{USB_CLASS_STILL_IMAGE,		"still"},	{USB_CLASS_PRINTER,		"print"},	{USB_CLASS_MASS_STORAGE,	"stor."},	{USB_CLASS_HUB,			"hub"},	{USB_CLASS_CDC_DATA,		"data"},	{USB_CLASS_CSCID,		"scard"},	{USB_CLASS_CONTENT_SEC,		"c-sec"},	{USB_CLASS_VIDEO,		"video"},	{USB_CLASS_WIRELESS_CONTROLLER,	"wlcon"},	{USB_CLASS_MISC,		"misc"},	{USB_CLASS_APP_SPEC,		"app."},	{USB_CLASS_VENDOR_SPEC,		"vend."},	{-1,				"unk."}		/* leave as last */}; /*****************************************************************/ void usbfs_conn_disc_event(void){	atomic_add(2, &device_event.count);	wake_up(&device_event.wait);} static const char *class_decode(const int class){	int ix; 	for (ix = 0; clas_info[ix].class != -1; ix++)		if (clas_info[ix].class == class)			break;	return clas_info[ix].class_name;} static char *usb_dump_endpoint_descriptor(int speed, char *start, char *end,				const struct usb_endpoint_descriptor *desc){	char dir, unit, *type;	unsigned interval, bandwidth = 1; 	if (start > end)		return start; 	dir = usb_endpoint_dir_in(desc) ? 'I' : 'O'; 	if (speed == USB_SPEED_HIGH) {		switch (usb_endpoint_maxp(desc) & (0x03 << 11)) {		case 1 << 11:			bandwidth = 2; break;		case 2 << 11:			bandwidth = 3; break;		}	} 	/* this isn't checking for illegal values */	switch (usb_endpoint_type(desc)) {	case USB_ENDPOINT_XFER_CONTROL:		type = "Ctrl";		if (speed == USB_SPEED_HIGH)	/* uframes per NAK */			interval = desc->bInterval;		else			interval = 0;		dir = 'B';			/* ctrl is bidirectional */		break;	case USB_ENDPOINT_XFER_ISOC:		type = "Isoc";		interval = 1 << (desc->bInterval - 1);		break;	case USB_ENDPOINT_XFER_BULK:		type = "Bulk";		if (speed == USB_SPEED_HIGH && dir == 'O') /* uframes per NAK */			interval = desc->bInterval;		else			interval = 0;		break;	case USB_ENDPOINT_XFER_INT:		type = "Int.";		if (speed == USB_SPEED_HIGH || speed == USB_SPEED_SUPER)			interval = 1 << (desc->bInterval - 1);		else			interval = desc->bInterval;		break;	default:	/* "can't happen" */		return start;	}	interval *= (speed == USB_SPEED_HIGH ||		     speed == USB_SPEED_SUPER) ? 125 : 1000;	if (interval % 1000)		unit = 'u';	else {		unit = 'm';		interval /= 1000;	} 	start += sprintf(start, format_endpt, desc->bEndpointAddress, dir,			 desc->bmAttributes, type,			 (usb_endpoint_maxp(desc) & 0x07ff) *			 bandwidth,			 interval, unit);	return start;} static char *usb_dump_interface_descriptor(char *start, char *end,					const struct usb_interface_cache *intfc,					const struct usb_interface *iface,					int setno){	const struct usb_interface_descriptor *desc;	const char *driver_name = "";	int active = 0; 	if (start > end)		return start;	desc = &intfc->altsetting[setno].desc;	if (iface) {		driver_name = (iface->dev.driver				? iface->dev.driver->name				: "(none)");		active = (desc == &iface->cur_altsetting->desc);	}	start += sprintf(start, format_iface,			 active ? '*' : ' ',	/* mark active altsetting */			 desc->bInterfaceNumber,			 desc->bAlternateSetting,			 desc->bNumEndpoints,			 desc->bInterfaceClass,			 class_decode(desc->bInterfaceClass),			 desc->bInterfaceSubClass,			 desc->bInterfaceProtocol,			 driver_name);	return start;} static char *usb_dump_interface(int speed, char *start, char *end,				const struct usb_interface_cache *intfc,				const struct usb_interface *iface, int setno){	const struct usb_host_interface *desc = &intfc->altsetting[setno];	int i; 	start = usb_dump_interface_descriptor(start, end, intfc, iface, setno);	for (i = 0; i < desc->desc.bNumEndpoints; i++) {		if (start > end)			return start;		start = usb_dump_endpoint_descriptor(speed,				start, end, &desc->endpoint[i].desc);	}	return start;} static char *usb_dump_iad_descriptor(char *start, char *end,			const struct usb_interface_assoc_descriptor *iad){	if (start > end)		return start;	start += sprintf(start, format_iad,			 iad->bFirstInterface,			 iad->bInterfaceCount,			 iad->bFunctionClass,			 class_decode(iad->bFunctionClass),			 iad->bFunctionSubClass,			 iad->bFunctionProtocol);	return start;} /* TBD: * 0. TBDs * 1. marking active interface altsettings (code lists all, but should mark *    which ones are active, if any) */static char *usb_dump_config_descriptor(char *start, char *end,				const struct usb_config_descriptor *desc,				int active){	if (start > end)		return start;	start += sprintf(start, format_config,			 /* mark active/actual/current cfg. */			 active ? '*' : ' ',			 desc->bNumInterfaces,			 desc->bConfigurationValue,			 desc->bmAttributes,			 desc->bMaxPower * 2);	return start;} static char *usb_dump_config(int speed, char *start, char *end,			     const struct usb_host_config *config, int active){	int i, j;	struct usb_interface_cache *intfc;	struct usb_interface *interface; 	if (start > end)		return start;	if (!config)		/* getting these some in 2.3.7; none in 2.3.6 */		return start + sprintf(start, "(null Cfg. desc.)\n");	start = usb_dump_config_descriptor(start, end, &config->desc, active);	for (i = 0; i < USB_MAXIADS; i++) {		if (config->intf_assoc[i] == NULL)			break;		start = usb_dump_iad_descriptor(start, end,					config->intf_assoc[i]);	}	for (i = 0; i < config->desc.bNumInterfaces; i++) {		intfc = config->intf_cache[i];		interface = config->interface[i];		for (j = 0; j < intfc->num_altsetting; j++) {			if (start > end)				return start;			start = usb_dump_interface(speed,				start, end, intfc, interface, j);		}	}	return start;} /* * Dump the different USB descriptors. */static char *usb_dump_device_descriptor(char *start, char *end,				const struct usb_device_descriptor *desc){	u16 bcdUSB = le16_to_cpu(desc->bcdUSB);	u16 bcdDevice = le16_to_cpu(desc->bcdDevice); 	if (start > end)		return start;	start += sprintf(start, format_device1,			  bcdUSB >> 8, bcdUSB & 0xff,			  desc->bDeviceClass,			  class_decode(desc->bDeviceClass),			  desc->bDeviceSubClass,			  desc->bDeviceProtocol,			  desc->bMaxPacketSize0,			  desc->bNumConfigurations);	if (start > end)		return start;	start += sprintf(start, format_device2,			 le16_to_cpu(desc->idVendor),			 le16_to_cpu(desc->idProduct),			 bcdDevice >> 8, bcdDevice & 0xff);	return start;} /* * Dump the different strings that this device holds. */static char *usb_dump_device_strings(char *start, char *end,				     struct usb_device *dev){	if (start > end)		return start;	if (dev->manufacturer)		start += sprintf(start, format_string_manufacturer,				 dev->manufacturer);	if (start > end)		goto out;	if (dev->product)		start += sprintf(start, format_string_product, dev->product);	if (start > end)		goto out;#ifdef ALLOW_SERIAL_NUMBER	if (dev->serial)		start += sprintf(start, format_string_serialnumber,				 dev->serial);#endif out:	return start;} static char *usb_dump_desc(char *start, char *end, struct usb_device *dev){	int i; 	if (start > end)		return start; 	start = usb_dump_device_descriptor(start, end, &dev->descriptor); 	if (start > end)		return start; 	start = usb_dump_device_strings(start, end, dev); 	for (i = 0; i < dev->descriptor.bNumConfigurations; i++) {		if (start > end)			return start;		start = usb_dump_config(dev->speed,				start, end, dev->config + i,				/* active ? */				(dev->config + i) == dev->actconfig);	}	return start;}  #ifdef PROC_EXTRA /* TBD: may want to add this code later */ static char *usb_dump_hub_descriptor(char *start, char *end,				     const struct usb_hub_descriptor *desc){	int leng = USB_DT_HUB_NONVAR_SIZE;	unsigned char *ptr = (unsigned char *)desc; 	if (start > end)		return start;	start += sprintf(start, "Interface:");	while (leng && start <= end) {		start += sprintf(start, " %02x", *ptr);		ptr++; leng--;	}	*start++ = '\n';	return start;} static char *usb_dump_string(char *start, char *end,			     const struct usb_device *dev, char *id, int index){	if (start > end)		return start;	start += sprintf(start, "Interface:");	if (index <= dev->maxstring && dev->stringindex &&	    dev->stringindex[index])		start += sprintf(start, "%s: %.100s ", id,				 dev->stringindex[index]);	return start;} #endif /* PROC_EXTRA */ /*****************************************************************/ /* This is a recursive function. Parameters: * buffer - the user-space buffer to write data into * nbytes - the maximum number of bytes to write * skip_bytes - the number of bytes to skip before writing anything * file_offset - the offset into the devices file on completion * The caller must own the device lock. */static ssize_t usb_device_dump(char __user **buffer, size_t *nbytes,			       loff_t *skip_bytes, loff_t *file_offset,			       struct usb_device *usbdev, struct usb_bus *bus,			       int level, int index, int count){	int chix;	int ret, cnt = 0;	int parent_devnum = 0;	char *pages_start, *data_end, *speed;	unsigned int length;	ssize_t total_written = 0; 	/* don't bother with anything else if we're not writing any data */

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