kernel module to enable i801 2443 device on Asus P4B boards.

      from Ilja Rauhut <rauhut@alwa02.physik.uni-siegen.de>


git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@1329 7894878c-1315-0410-8ee3-d5d059ff63e0

3 files changed, 372 insertions, 0 deletions

diff --git a/prog/hotplug/Makefile.p4b b/prog/hotplug/Makefile.p4b
new file mode 100644
index 00000000..e39057c1
--- /dev/null
+++ b/prog/hotplug/Makefile.p4b
@@ -0,0 +1,35 @@
+# pcwd Kernel Module Makefile
+# 
+
+VERSION=1.40
+
+VER = $(shell uname -r)
+INCLUDEDIR= /lib/modules/$(VER)/build/include
+
+CFLAGS= -D__KERNEL__ -DMODULE -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -fno-strict-aliasing -I$(INCLUDEDIR)
+
+OBJS = p4b_smbus.o
+
+all: $(OBJS)
+
+install:
+	$(MAKE)
+	install -d /lib/modules/$(VER)/kernel/drivers/char
+	install -c p4bsmbus.o /lib/modules/$(VER)/kernel/drivers/char
+#	test ! -x /dev/watchdog || mknod -m 600 /dev/watchdog c 10 130
+#	test ! -x /dev/temperature || mknod -m 600 /dev/temperature c 10 131
+
+inst:
+	$(MAKE)
+	rmmod p4b_smbus
+	install -d /lib/modules/$(VER)/kernel/drivers/char
+	install -c p4b_smbus.o /lib/modules/$(VER)/kernel/drivers/char
+	depmod -a
+#	modprobe p4b_smbus
+
+clean:
+	rm -f *.o *~ core
+
+cleandist:
+	rm -f *.o *~ core
+
diff --git a/prog/hotplug/README.p4b b/prog/hotplug/README.p4b
new file mode 100644
index 00000000..c04ffc30
--- /dev/null
+++ b/prog/hotplug/README.p4b
@@ -0,0 +1,69 @@
+What is it?
+-----------
+
+This is just a quick and dirty hack to get the hardware monitoring working
+on the ASUS P4B board under Linux.
+ASUS switches of the SMBus PCI Device in the i801 ICH2 chip. I spoke two times
+with the German support an learned that: "We do not want the users to be
+irritated by just another PCI Device in the Win98 device manager."
+Really funny :-).
+
+What does the module do?
+------------------------
+
+It turnes off (!) the bits number 8 and 3 in the LPC register of the ICH2.
+This you can also try as root with setpci and pcitweak.
+First do a:
+
+setpci -d 8086:2440 f2.w
+
+You will get an hex number VAL - in my case 148 (Hex)-, where you have to 
+erase the two bits - in my case you get 40 (Hex).
+Then do a:
+
+setpci -d 8086:2440 f2.w=VAL
+
+Running "lspci -n" you will not see any new device, but with "pcitweak -l" you
+should get a line similar to this in the output:
+
+PCI: 00:1f:3: chip 8086,2443 card 1043,8028 rev 12 class 0c,05,00 hdr 00
+
+The important thing is the "8086,2443" here.
+The device is activated, but not included in /proc/pci and 
+/proc/bus/pci/devices. This is the reason for running the module.
+
+What are the system requirements?
+---------------------------------
+
+- Obviously a board with Intel i801BA ICH2 with broken bios.
+- A linux working with a 2.4 kernel AND hotplug support in it! 
+- A installed kernel tree and gcc.
+- i2c and sensor modules installed.
+
+How to install?
+---------------
+
+Simply do a:
+
+make -f Makefile.p4b
+insmod p4b_smbus.o
+modprobe  i2c-core
+modprobe  i2c-i801
+modprobe  i2c-dev
+modprobe  i2c-proc
+
+Then run your sensor:
+
+modprobe  w83781d
+
+What should i never do?
+-----------------------
+
+Do not try to do a "rmmod p4b_smbus" before a "rmmod i2c-i801".
+The other way around should be okay. Otherwise you remove the PCI device
+without notifying the i2c driver.
+
+
+-------------------------------
+Ilja Rauhut <IljaRauhut@web.de>
+ 
diff --git a/prog/hotplug/p4b_smbus.c b/prog/hotplug/p4b_smbus.c
new file mode 100644
index 00000000..711209ac
--- /dev/null
+++ b/prog/hotplug/p4b_smbus.c
@@ -0,0 +1,268 @@
+/*
+ * p4b_smbus.c
+ *
+ * Initialize the I801SMBus device on ASUS P4B Bords
+ */
+/*
+    Copyright (c) 2002 Ilja Rauhut <IljaRauhut@web.de>,
+
+    Based on the m7101.c hotplug example by:
+
+    Copyright (c) 2000 Burkhard Kohl <buk@buks.ipn.de>,
+    Frank Bauer <frank.bauer@nikocity.de>, and
+    Mark D. Studebaker <mdsxyz123@yahoo.com>
+
+    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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+/* CHANGES:
+ * February 13,2002 IR First Version
+ *
+ * This code is absolutely experimental - use it at your own 
+ * risk. 
+ *
+ * Warning, this module will work only with 2.4.x kernels.
+ * If it works with earlier kernels then it is by luck.
+ *
+ * Warning, this module does not work with egcs < 2.95.2, use 
+ * gcc > 2.7.2 or egcs >= 2.95.2. 
+ *
+ */
+
+
+#ifdef P4Bsmbus_DEBUG
+#define DBG(x...) printk(x)
+#else
+#define DBG(x...)
+#endif
+
+#ifndef TRUE
+#define TRUE 1
+#define FALSE !TRUE
+#endif
+
+#include <linux/config.h>
+#ifndef CONFIG_HOTPLUG
+#error ERROR - You must have 'Support for hot-pluggable devices' enabled in your kernel (under 'general setup')!!
+#endif
+
+/* Deal with CONFIG_MODVERSIONS */
+#ifdef CONFIG_MODVERSIONS
+#define MODVERSIONS
+#include <linux/modversions.h>
+#endif
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/stddef.h>
+#include <linux/ioport.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <asm/types.h>
+
+#include <linux/sched.h> 
+#include <linux/signal.h> 
+#include <asm/irq.h>
+
+/* 
+rmm    from lm_sensors-2.3.3: 
+ */
+
+#define SMB_IO_SIZE  0xF
+#define SMB_BASE 0x20
+
+/* status, used to indicate that io space needs to be freed */
+static struct pci_dev *i801smbus = NULL;
+static int i801smbus_inserted = FALSE;
+extern void cleanup_module();
+ 
+static rwlock_t i801smbus_lock = RW_LOCK_UNLOCKED;
+static unsigned long i801smbus_lock_flags = 0;
+
+/* 
+ * Checks whether SMBus is enabled and turns it on in case they are not. 
+ * It's done by clearing Bit 8 and 4 in i801 config space F2h, PCI-Device 0x8086:0x2440
+ */
+static int
+i801smbus_enable(struct pci_dev *dev){
+	u16  val   = 0;
+
+	pci_read_config_word(dev, 0xF2, &val);
+	DBG("i801smbus: i801smbus config byte reading 0x%X.\n", val);
+	if (val & 0x008) {
+		pci_write_config_word(dev, 0xF2, val & 0x77);
+		pci_read_config_word(dev, 0xF2, &val);
+		if(val & 0x008) 
+		  {
+		    DBG("i801smbus: i801smbus config byte locked:-(\n");
+		    return -EIO;
+		  }
+		else
+		  printk("SMBus activated in LPC!\n");
+	}
+	return 0;
+
+}
+
+/*
+ * Builds the basic pci_dev for the i801smbus
+ */
+static int i801smbus_build(struct pci_dev **i801smbus, struct pci_bus *bus) 
+{
+	u32 devfn;
+	u16 id = 0;
+	u16 vid = 0;
+	int ret;
+
+	DBG("i801smbus: requesting kernel space for the i801smbus entry.\n");
+        *i801smbus = kmalloc(sizeof(**i801smbus), GFP_ATOMIC);
+        if(NULL == *i801smbus) {
+		printk("i801smbus: out of memory.\n");
+		return -ENOMEM;
+        }
+
+	/* minimally fill in structure for search */
+	/* The device should be on the same bus as the i801. */
+        memset(*i801smbus, 0, sizeof(**i801smbus));
+        (*i801smbus)->bus    = bus;
+        (*i801smbus)->sysdata = bus->sysdata;
+        (*i801smbus)->hdr_type = PCI_HEADER_TYPE_NORMAL;
+
+	DBG("i801smbus: now looking for i801smbus.\n");
+	for  (id = 0, devfn = 0; devfn < 0xFF; devfn++) {
+		(*i801smbus)->devfn = devfn;
+	    	ret = pci_read_config_word(*i801smbus, PCI_DEVICE_ID, &id);
+		if (ret == 0 && 0x2443 == id) {
+		    	pci_read_config_word(*i801smbus, PCI_VENDOR_ID, &vid);
+			if(vid == 0x8086)
+				break;
+		}
+	}
+	if (0x2443 != id) {	
+		DBG("i801smbus: i801smbus not found although i801 present - strange.\n");
+		return -EACCES;
+	} else {
+		DBG("i801smbus: i801smbus found and enabled. Devfn: 0x%X.\n", devfn);
+	}
+	/* We now have the devfn and bus of the i801smbus device. 
+         * let's put the rest of the device data together.
+         */
+
+        (*i801smbus)->vendor = 0x8086;
+        (*i801smbus)->hdr_type = PCI_HEADER_TYPE_NORMAL;
+        (*i801smbus)->device = 0x2443;
+ 
+	return(pci_setup_device(*i801smbus));
+}
+
+
+
+
+/* Initialize the module */
+int init_module(void)
+{
+	struct pci_bus *bus = NULL;
+	struct pci_dev *dev = NULL;
+	int ret = 0;
+
+	DBG("i801smbus: init_module().\n");
+
+	/* Are we on a PCI-Board? */
+	if (!pci_present()) {
+		printk("i801smbus: No PCI bus found - sorry.\n");
+		return -ENODEV;
+	}
+
+	/* We want to be sure that the i801smbus is not present yet. */
+	dev = pci_find_device(0x8086,0x2443, NULL);
+
+	if (dev) 
+	  {
+	    printk("i801smbus: SMBus already actve\n");
+	    return -EPERM;
+	  }
+	
+	/* Are we operating a i801 chipset */
+	dev = pci_find_device(0x8086,0x2440, NULL);
+	if (NULL == dev) 
+	  {
+	    printk("INTEL ICH2 type 82801BA not found.\n");
+	    return -ENODEV ;
+	  }
+	/* we need the bus pointer later */
+	bus = dev->bus;
+
+
+	if ( (ret = i801smbus_enable(dev)) ) 
+	  {
+	    printk("i801smbus: Unable to turn on i801smbus device - sorry!\n");
+	    return ret;
+	  }
+     
+	if ( (ret = i801smbus_build(&i801smbus, bus)) )
+		return ret;
+
+
+	if ( (ret = pci_enable_device(i801smbus)) ) {
+		printk("i801smbus: Unable to pci_enable i801smbus device!\n");
+		return ret;
+	}
+    
+	DBG("i801smbus: now inserting.\n");
+	pci_insert_device(i801smbus, i801smbus->bus);
+	printk("i801smbus: Enabled\n");
+	i801smbus_inserted = TRUE;
+	return 0;
+}
+
+
+void cleanup_module()
+{
+	write_lock_irqsave(i801smbus_lock, i801smbus_lock_flags);
+	if (i801smbus_inserted) {
+		pci_remove_device(i801smbus);
+		i801smbus_inserted = FALSE;
+	}
+	write_unlock_irqrestore(i801smbus_lock, i801smbus_lock_flags);
+
+	if (NULL != i801smbus)
+	  {
+	    kfree(i801smbus);
+	  }
+	printk("i801smbus: SMBus device removed\n");
+}
+
+EXPORT_NO_SYMBOLS;
+
+#ifdef MODULE
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ilja Rauhut <IljaRauhut@web.de>, "
+              "Burkhard Kohl <bku@buks.ipn.de>, "
+	      "Frank Bauer <frank.bauer@nikocity.de>, "
+	      "and Mark Studebaker <mdsxyz123@yahoo.com>");
+MODULE_DESCRIPTION("i801smbus PCI Inserter");
+
+#endif				/* MODULE */
+
+
+
+
+
+
+
+
+
+