PIIX4 update

It compiles now for 2.0 kernels; I hope it still compiles for 2.1 kernels :-)

Changes:
* The non-BIOS PCI interface was introduced in kernel 2.1.54, so I changed
  all #ifdef statements to use that kernel as starting point
* I integrated everything in piix4.h into piix4.c; as no other module will
  ever need to know about anything PIIX4-specific, we do not need a
  separate header file (same went for lm78.c and lm75.c)
* In piix4_setup, both the 2.0 and 2.1 versions continue seeking for PCI
  devices until they have found 'function 3' of the PIIX4. This is the
  'function' we need for SMBus access.
* At some places in piix4_setup, even for 2.1 kernels the PCI BIOS code was
  used. This was seemingly needed, probably because the wrong 'function'
  was accessed. I have removed this; if there are troubles with the PIIX4 on
  kernels newer than 2.1.53, we need to introduce it again.
* Renamed global things to start uniformly with piix4_
* Changed printk statements to start with piix4.o:
* Pasted in missing part of piix4_access
* No need to lock the adapter on access; this is already done by the
  smbus_access function in smbus.c. I corrected a locking bug there too,
  by the way.
* Added a few include files needed by 2.0 at least
* Replaced the call to schedule_timeout() in piix4_do_pause with the old
  code; schedule_timeout seems to be defined nowhere?!? Phil, was this
  your addition, and if so, what should it read?


git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@34 7894878c-1315-0410-8ee3-d5d059ff63e0

kernel/include/compat.h

@@ -49,5 +49,31 @@
 #define get_user_data(to,from) get_user(to,from)
 #endif
 
+/* If the new PCI interface is not present, fall back on the old PCI BIOS
+   interface. We also define some things to unite both interfaces. Not
+   very nice, but it works like a charm. 
+   device is the 2.1 struct pci_dev, bus is the 2.0 bus number, dev is the
+   2.0 device/function code, com is the PCI command, and res is the result. */
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,1,54))
+#define pci_present pcibios_present
+#define pci_read_config_byte_united(device,bus,dev,com,res) \
+                            pcibios_read_config_byte(bus,dev,com,res);
+#define pci_read_config_word_united(device,bus,dev,com,res) \
+                            pcibios_read_config_word(bus,dev,com,res);
+#define pci_write_config_byte_united(device,bus,dev,com,res) \
+                            pcibios_write_config_byte(bus,dev,com,res);
+#define pci_write_config_word_united(device,bus,dev,com,res) \
+                            pcibios_write_config_word(bus,dev,com,res);
+#else
+#define pci_read_config_byte_united(device,bus,dev,com,res) \
+                            pci_read_config_byte(device,com,res);
+#define pci_read_config_word_united(device,bus,dev,com,res) \
+                            pci_read_config_word(device,com,res);
+#define pci_write_config_byte_united(device,bus,dev,com,res) \
+                            pci_write_config_byte(device,com,res);
+#define pci_write_config_word_united(device,bus,dev,com,res) \
+                            pci_write_config_byte(device,com,res);
+#endif
+
 
 #endif /* SENSORS_COMPAT_H */