2 * The PCI Library -- Configuration Access via /sys/bus/pci
4 * Copyright (c) 2003 Matthew Wilcox <willy@fc.hp.com>
5 * Copyright (c) 1997--2003 Martin Mares <mj@ucw.cz>
7 * Can be freely distributed and used under the terms of the GNU GPL.
20 #include <sys/types.h>
26 sysfs_config(struct pci_access *a)
28 a->method_params[PCI_ACCESS_SYS_BUS_PCI] = PATH_SYS_BUS_PCI;
32 sysfs_name(struct pci_access *a)
34 return a->method_params[PCI_ACCESS_SYS_BUS_PCI];
38 sysfs_detect(struct pci_access *a)
40 if (access(sysfs_name(a), R_OK))
42 a->debug("Cannot open %s", sysfs_name(a));
45 a->debug("...using %s", sysfs_name(a));
50 sysfs_init(struct pci_access *a)
56 sysfs_cleanup(struct pci_access *a)
65 #define OBJNAMELEN 1024
67 sysfs_obj_name(struct pci_dev *d, char *object, char *buf)
69 int n = snprintf(buf, OBJNAMELEN, "%s/devices/%04x:%02x:%02x.%d/%s",
70 sysfs_name(d->access), d->domain, d->bus, d->dev, d->func, object);
71 if (n < 0 || n >= OBJNAMELEN)
72 d->access->error("File name too long");
76 sysfs_get_value(struct pci_dev *d, char *object)
78 struct pci_access *a = d->access;
80 char namebuf[OBJNAMELEN], buf[256];
82 sysfs_obj_name(d, object, namebuf);
83 fd = open(namebuf, O_RDONLY);
85 a->error("Cannot open %s: %s", namebuf, strerror(errno));
86 n = read(fd, buf, sizeof(buf));
89 a->error("Error reading %s: %s", namebuf, strerror(errno));
90 if (n >= (int) sizeof(buf))
91 a->error("Value in %s too long", namebuf);
93 return strtol(buf, NULL, 0);
97 sysfs_get_resources(struct pci_dev *d)
99 struct pci_access *a = d->access;
100 char namebuf[OBJNAMELEN], buf[256];
104 sysfs_obj_name(d, "resource", namebuf);
105 file = fopen(namebuf, "r");
107 a->error("Cannot open %s: %s", namebuf, strerror(errno));
108 for (i = 0; i < 8; i++)
110 unsigned long long start, end, size;
111 if (!fgets(buf, sizeof(buf), file))
113 if (sscanf(buf, "%llx %llx", &start, &end) != 2)
114 a->error("Syntax error in %s", namebuf);
115 if (start != (unsigned long long)(pciaddr_t) start ||
116 end != (unsigned long long)(pciaddr_t) end)
118 a->warning("Resource %d in %s has a 64-bit address, ignoring", namebuf);
122 size = end - start + 1;
127 d->base_addr[i] = start;
132 d->rom_base_addr = start;
139 static void sysfs_scan(struct pci_access *a)
143 struct dirent *entry;
146 n = snprintf(dirname, sizeof(dirname), "%s/devices", sysfs_name(a));
147 if (n < 0 || n >= (int) sizeof(dirname))
148 a->error("Directory name too long");
149 dir = opendir(dirname);
151 a->error("Cannot open %s", dirname);
152 while ((entry = readdir(dir)))
155 unsigned int dom, bus, dev, func;
157 /* ".", ".." or a special non-device perhaps */
158 if (entry->d_name[0] == '.')
161 d = pci_alloc_dev(a);
162 if (sscanf(entry->d_name, "%x:%x:%x.%d", &dom, &bus, &dev, &func) < 4)
163 a->error("sysfs_scan: Couldn't parse entry name %s", entry->d_name);
168 d->hdrtype = pci_read_byte(d, PCI_HEADER_TYPE) & 0x7f;
171 sysfs_get_resources(d);
172 d->vendor_id = sysfs_get_value(d, "vendor");
173 d->device_id = sysfs_get_value(d, "device");
174 d->irq = sysfs_get_value(d, "irq");
175 d->known_fields = PCI_FILL_IDENT | PCI_FILL_IRQ | PCI_FILL_BASES | PCI_FILL_ROM_BASE | PCI_FILL_SIZES;
183 sysfs_setup(struct pci_dev *d, int rw)
185 struct pci_access *a = d->access;
187 if (a->cached_dev != d || a->fd_rw < rw)
189 char namebuf[OBJNAMELEN];
192 sysfs_obj_name(d, "config", namebuf);
193 a->fd_rw = a->writeable || rw;
194 a->fd = open(namebuf, a->fd_rw ? O_RDWR : O_RDONLY);
196 a->warning("Cannot open %s", namebuf);
203 static int sysfs_read(struct pci_dev *d, int pos, byte *buf, int len)
205 int fd = sysfs_setup(d, 0);
210 res = do_read(d, fd, buf, len, pos);
213 d->access->warning("sysfs_read: read failed: %s", strerror(errno));
218 d->access->warning("sysfs_read: tried to read %d bytes at %d, but got only %d", len, pos, res);
224 static int sysfs_write(struct pci_dev *d, int pos, byte *buf, int len)
226 int fd = sysfs_setup(d, 1);
231 res = do_write(d, fd, buf, len, pos);
234 d->access->warning("sysfs_write: write failed: %s", strerror(errno));
239 d->access->warning("sysfs_write: tried to write %d bytes at %d, but got only %d", len, pos, res);
245 static void sysfs_cleanup_dev(struct pci_dev *d)
247 struct pci_access *a = d->access;
249 if (a->cached_dev == d)
251 a->cached_dev = NULL;
257 struct pci_methods pm_linux_sysfs = {
264 pci_generic_fill_info,