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[Qemu-devel] [PATCH] Add USB sys file-system support (v6)
From: |
TJ |
Subject: |
[Qemu-devel] [PATCH] Add USB sys file-system support (v6) |
Date: |
Tue, 23 Sep 2008 02:33:59 +0100 |
This patch adds support for host USB devices discovered via:
/sys/bus/usb/devices/* and opened from /dev/bus/usb/*/*
/dev/bus/usb/devices and opened from /dev/bus/usb/*/*
in addition to the existing discovery via:
/proc/bus/usb/devices and opened from /proc/bus/usb/*/*
Signed-off-by: TJ <address@hidden>
---
--- a/usb-linux.c 2008-09-17 22:39:38.000000000 +0100
+++ b/usb-linux.c 2008-09-23 02:28:48.000000000 +0100
@@ -7,6 +7,10 @@
* Support for host device auto connect & disconnect
* Major rewrite to support fully async operation
*
+ * Copyright 2008 TJ <address@hidden>
+ * Added flexible support for /dev/bus/usb /sys/bus/usb/devices in
addition
+ * to the legacy /proc/bus/usb USB device discovery and handling
+ *
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
deal
* in the Software without restriction, including without limitation the rights
@@ -72,9 +76,20 @@
#define dprintf(...)
#endif
-#define USBDEVFS_PATH "/proc/bus/usb"
+#define USBPROCBUS_PATH "/proc/bus/usb"
#define PRODUCT_NAME_SZ 32
#define MAX_ENDPOINTS 16
+#define USBDEVBUS_PATH "/dev/bus/usb"
+#define USBSYSBUS_PATH "/sys/bus/usb"
+
+static char *usb_host_device_path;
+
+#define USB_FS_NONE 0
+#define USB_FS_PROC 1
+#define USB_FS_DEV 2
+#define USB_FS_SYS 3
+
+static int usb_fs_type = 0;
/* endpoint association data */
struct endp_data {
@@ -890,13 +905,18 @@
printf("husb: open device %d.%d\n", bus_num, addr);
- snprintf(buf, sizeof(buf), USBDEVFS_PATH "/%03d/%03d",
+ if (!usb_host_device_path) {
+ perror("husb: USB Host Device Path not set");
+ goto fail;
+ }
+ snprintf(buf, sizeof(buf), "%s/%03d/%03d", usb_host_device_path,
bus_num, addr);
fd = open(buf, O_RDWR | O_NONBLOCK);
if (fd < 0) {
perror(buf);
goto fail;
}
+ dprintf("husb: opened %s\n", buf);
/* read the device description */
dev->descr_len = read(fd, dev->descr, sizeof(dev->descr));
@@ -1038,23 +1058,29 @@
return q - buf;
}
-static int usb_host_scan(void *opaque, USBScanFunc *func)
+/*
+ Use /proc/bus/usb/devices or /dev/bus/usb/devices file to determine
+ host's USB devices. This is legacy support since many distributions
+ are moving to /sys/bus/usb
+*/
+static int usb_host_scan_dev(void *opaque, USBScanFunc *func)
{
- FILE *f;
+ FILE *f = 0;
char line[1024];
char buf[1024];
int bus_num, addr, speed, device_count, class_id, product_id, vendor_id;
- int ret;
char product_name[512];
+ int ret = 0;
- f = fopen(USBDEVFS_PATH "/devices", "r");
+ snprintf(line, sizeof(line), "%s/devices", usb_host_device_path);
+ f = fopen(line, "r");
if (!f) {
- term_printf("husb: could not open %s\n", USBDEVFS_PATH "/devices");
- return 0;
+ perror("husb: cannot open devices file");
+ goto the_end;
}
+
device_count = 0;
bus_num = addr = speed = class_id = product_id = vendor_id = 0;
- ret = 0;
for(;;) {
if (fgets(line, sizeof(line), f) == NULL)
break;
@@ -1106,12 +1132,191 @@
fail: ;
}
if (device_count && (vendor_id || product_id)) {
- /* Add the last device. */
- ret = func(opaque, bus_num, addr, class_id, vendor_id,
- product_id, product_name, speed);
+ /* Add the last device. */
+ ret = func(opaque, bus_num, addr, class_id, vendor_id,
+ product_id, product_name, speed);
+ }
+ the_end:
+ if (f) fclose(f);
+ return ret;
+}
+
+/*
+ Use /sys/bus/usb/devices/ directory to determine host's USB devices.
+
+ This code is taken from Robert Schiele's original patches posted to the
+ Novell bug-tracker https://bugzilla.novell.com/show_bug.cgi?id=241950
+*/
+static int usb_host_scan_sys(void *opaque, USBScanFunc *func)
+{
+ FILE *f;
+ DIR *dir = 0;
+ char line[1024];
+ int bus_num, addr, speed, class_id, product_id, vendor_id;
+ int ret = 0;
+ char product_name[512];
+ struct dirent* de;
+
+ dir = opendir(USBSYSBUS_PATH "/devices");
+ if (!dir) {
+ perror("husb: cannot open devices directory");
+ goto the_end;
+ }
+
+ while ((de = readdir(dir))) {
+ if (de->d_name[0] != '.' && ! strchr(de->d_name, ':')) {
+ char filename[PATH_MAX];
+ char* tmpstr = de->d_name;
+ if (!strncmp(de->d_name, "usb", 3))
+ tmpstr += 3;
+
+ bus_num = atoi(tmpstr);
+ snprintf(filename, PATH_MAX, USBSYSBUS_PATH
"/devices/%s/devnum", de->d_name);
+ f = fopen(filename, "r");
+ if (!f) {
+ term_printf("Could not open %s\n", filename);
+ goto the_end;
+ }
+ fgets(line, sizeof(line), f);
+ fclose(f);
+ addr = atoi(line);
+ snprintf(filename, PATH_MAX, USBSYSBUS_PATH
"/devices/%s/bDeviceClass", de->d_name);
+ f = fopen(filename, "r");
+ if (!f) {
+ term_printf("Could not open %s\n", filename);
+ goto the_end;
+ }
+ fgets(line, sizeof(line), f);
+ fclose(f);
+ class_id = strtoul(line, NULL, 16);
+ snprintf(filename, PATH_MAX, USBSYSBUS_PATH
"/devices/%s/idVendor", de->d_name);
+ f = fopen(filename, "r");
+ if (!f) {
+ term_printf("Could not open %s\n", filename);
+ goto the_end;
+ }
+ fgets(line, sizeof(line), f);
+ fclose(f);
+ vendor_id = strtoul(line, NULL, 16);
+ snprintf(filename, PATH_MAX, USBSYSBUS_PATH
"/devices/%s/idProduct", de->d_name);
+ f = fopen(filename, "r");
+ if (!f) {
+ term_printf("Could not open %s\n", filename);
+ goto the_end;
+ }
+ fgets(line, sizeof(line), f);
+ fclose(f);
+ product_id = strtoul(line, NULL, 16);
+ snprintf(filename, PATH_MAX, USBSYSBUS_PATH
"/devices/%s/product", de->d_name);
+ f = fopen(filename, "r");
+ if (f) {
+ fgets(line, sizeof(line), f);
+ fclose(f);
+ if (strlen(line) > 0)
+ line[strlen(line) - 1] = '\0';
+
+ pstrcpy(product_name, sizeof(product_name), line);
+ } else
+ *product_name = 0;
+
+ snprintf(filename, PATH_MAX, USBSYSBUS_PATH
"/devices/%s/speed", de->d_name);
+ f = fopen(filename, "r");
+ if (!f) {
+ term_printf("Could not open %s\n", filename);
+ goto the_end;
+ }
+ fgets(line, sizeof(line), f);
+ fclose(f);
+ if (!strcmp(line, "480\n"))
+ speed = USB_SPEED_HIGH;
+ else if (!strcmp(line, "1.5\n"))
+ speed = USB_SPEED_LOW;
+ else
+ speed = USB_SPEED_FULL;
+
+ ret = func(opaque, bus_num, addr, class_id, vendor_id,
+ product_id, product_name, speed);
+ if (ret)
+ goto the_end;
+ }
+ }
+ the_end:
+ if (dir) closedir(dir);
+ return ret;
+}
+
+/*
+ Determine how to access the host's USB devices and call the specific
+ support function.
+ */
+static int usb_host_scan(void *opaque, USBScanFunc *func)
+{
+ FILE *f = 0;
+ DIR *dir = 0;
+ int ret = 0;
+ const char *devices = "/devices";
+ const char *trying = "husb: trying to open %s%s\n";
+ const char *failed = "husb: could not open %s%s\n";
+ char devpath[PATH_MAX];
+
+ // only check the host once
+ if (!usb_fs_type) {
+ // test for dev file-system access in /proc/
+ dprintf(trying, USBPROCBUS_PATH, devices);
+ f = fopen(USBPROCBUS_PATH "/devices", "r");
+ if (!f) {
+ dprintf(failed, USBPROCBUS_PATH, devices);
+ // maybe it has been moved to the /dev/ base
+ dprintf(trying, USBDEVBUS_PATH, devices);
+ f = fopen(USBDEVBUS_PATH "/devices", "r");
+ if (!f) {
+ dprintf(failed, USBDEVBUS_PATH, devices);
+ // test for newer sys file-system access
+ dprintf(trying, USBSYSBUS_PATH, devices);
+ dir = opendir(USBSYSBUS_PATH "/devices");
+ if (!dir) {
+ dprintf(failed, USBSYSBUS_PATH, devices);
+ goto the_end;
+ }
+ else { // devices found in /dev/bus/usb/ (yes - not a
mistake!)
+ strcpy(devpath, USBDEVBUS_PATH);
+ usb_fs_type = USB_FS_SYS;
+ }
+ if (dir) closedir(dir);
+ }
+ else { // devices found in /dev/bus/usb/
+ strcpy(devpath, USBDEVBUS_PATH);
+ usb_fs_type = USB_FS_DEV;
+ }
+ }
+ else { // devices found in /proc/bus/usb/
+ strcpy(devpath, USBPROCBUS_PATH);
+ usb_fs_type = USB_FS_PROC;
+ }
+ if (f) fclose(f);
+
+ // the module setting (used later for opening devices)
+ usb_host_device_path = qemu_mallocz(strlen(devpath)+1);
+ if (usb_host_device_path) {
+ strcpy(usb_host_device_path, devpath);
+ term_printf("husb: using %s\n", usb_host_device_path);
+ }
+ else { // out of memory?
+ perror("husb: unable to allocate memory for device path");
+ goto the_end;
+ }
+ }
+
+ switch (usb_fs_type) {
+ case USB_FS_PROC:
+ case USB_FS_DEV:
+ ret = usb_host_scan_dev(opaque, func);
+ break;
+ case USB_FS_SYS:
+ ret = usb_host_scan_sys(opaque, func);
+ break;
}
the_end:
- fclose(f);
return ret;
}
- [Qemu-devel] Re: [PATCH] Add USB sys file-system support (v3), (continued)
- [Qemu-devel] Re: [PATCH] Add USB sys file-system support (v3), Jason Wessel, 2008/09/08
- [Qemu-devel] [PATCH] Add USB sys file-system support (v4), TJ, 2008/09/17
- [Qemu-devel] Re: [PATCH] Add USB sys file-system support (v4), Anthony Liguori, 2008/09/17
- [Qemu-devel] [PATCH] Add USB sys file-system support (v5), TJ, 2008/09/17
- Re: [Qemu-devel] [PATCH] Add USB sys file-system support (v5), Rick Vernam, 2008/09/22
- Re: [Qemu-devel] [PATCH] Add USB sys file-system support (v5), Anthony Liguori, 2008/09/22
- Re: [Qemu-devel] [PATCH] Add USB sys file-system support (v5), Rick Vernam, 2008/09/25
- Re: [Qemu-devel] [PATCH] Add USB sys file-system support (v5), Anthony Liguori, 2008/09/25
- [Qemu-devel] Re: [PATCH] Add USB sys file-system support (v5), Anthony Liguori, 2008/09/22
- Re: [Qemu-devel] Re: [PATCH] Add USB sys file-system support (v5), TJ, 2008/09/22
- [Qemu-devel] [PATCH] Add USB sys file-system support (v6),
TJ <=
- [Qemu-devel] Re: [PATCH] Add USB sys file-system support (v6), Anthony Liguori, 2008/09/25
- Re: [Qemu-devel] Re: [PATCH] Add USB sys file-system support (v6), Jason Wessel, 2008/09/26
- Re: [Qemu-devel] Re: [PATCH] Add USB sys file-system support (v6), Anthony Liguori, 2008/09/26
- Re: [Qemu-devel] Re: [PATCH] Add USB sys file-system support (v6), Robert Riebisch, 2008/09/26
- Re: [Qemu-devel] Re: [PATCH] Add USB sys file-system support (v6), Anthony Liguori, 2008/09/26
- Re: [Qemu-devel] Re: [PATCH] Add USB sys file-system support (v6), Jason Wessel, 2008/09/26
- Re: [Qemu-devel] Re: [PATCH] Add USB sys file-system support (v6), Anthony Liguori, 2008/09/26
- [Qemu-devel] Re: [PATCH] Add USB sys file-system support (v6), TJ, 2008/09/30
- Re: [Qemu-devel] [PATCH] Add USB sys file-system support (v2), TJ, 2008/09/05