[PATCH] I2C: Move hwmon drivers (2/3)

Part 2: Move the driver files themselves.

Note that the patch "adds trailing whitespace", because it does move the
files as-is, and some files happen to have trailing whitespace.

From: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 875 insertions, 0 deletions

diff --git a/drivers/hwmon/via686a.c b/drivers/hwmon/via686a.c
new file mode 100644
index 0000000..164d479
--- /dev/null
+++ b/drivers/hwmon/via686a.c
@@ -0,0 +1,875 @@
+/*
+    via686a.c - Part of lm_sensors, Linux kernel modules
+		for hardware monitoring
+
+    Copyright (c) 1998 - 2002  Frodo Looijaard <frodol@dds.nl>,
+			Kyösti Mälkki <kmalkki@cc.hut.fi>,
+			Mark Studebaker <mdsxyz123@yahoo.com>,
+			and Bob Dougherty <bobd@stanford.edu>
+    (Some conversion-factor data were contributed by Jonathan Teh Soon Yew
+    <j.teh@iname.com> and Alex van Kaam <darkside@chello.nl>.)
+
+    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.
+*/
+
+/*
+    Supports the Via VT82C686A, VT82C686B south bridges.
+    Reports all as a 686A.
+    Warning - only supports a single device.
+*/
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/jiffies.h>
+#include <linux/i2c.h>
+#include <linux/i2c-sensor.h>
+#include <linux/init.h>
+#include <asm/io.h>
+
+
+/* If force_addr is set to anything different from 0, we forcibly enable
+   the device at the given address. */
+static unsigned short force_addr = 0;
+module_param(force_addr, ushort, 0);
+MODULE_PARM_DESC(force_addr,
+		 "Initialize the base address of the sensors");
+
+/* Addresses to scan.
+   Note that we can't determine the ISA address until we have initialized
+   our module */
+static unsigned short normal_i2c[] = { I2C_CLIENT_END };
+static unsigned int normal_isa[] = { 0x0000, I2C_CLIENT_ISA_END };
+
+/* Insmod parameters */
+SENSORS_INSMOD_1(via686a);
+
+/*
+   The Via 686a southbridge has a LM78-like chip integrated on the same IC.
+   This driver is a customized copy of lm78.c
+*/
+
+/* Many VIA686A constants specified below */
+
+/* Length of ISA address segment */
+#define VIA686A_EXTENT		0x80
+#define VIA686A_BASE_REG	0x70
+#define VIA686A_ENABLE_REG	0x74
+
+/* The VIA686A registers */
+/* ins numbered 0-4 */
+#define VIA686A_REG_IN_MAX(nr)	(0x2b + ((nr) * 2))
+#define VIA686A_REG_IN_MIN(nr)	(0x2c + ((nr) * 2))
+#define VIA686A_REG_IN(nr)	(0x22 + (nr))
+
+/* fans numbered 1-2 */
+#define VIA686A_REG_FAN_MIN(nr)	(0x3a + (nr))
+#define VIA686A_REG_FAN(nr)	(0x28 + (nr))
+
+/* temps numbered 1-3 */
+static const u8 VIA686A_REG_TEMP[]	= { 0x20, 0x21, 0x1f };
+static const u8 VIA686A_REG_TEMP_OVER[]	= { 0x39, 0x3d, 0x1d };
+static const u8 VIA686A_REG_TEMP_HYST[]	= { 0x3a, 0x3e, 0x1e };
+/* bits 7-6 */
+#define VIA686A_REG_TEMP_LOW1	0x4b
+/* 2 = bits 5-4, 3 = bits 7-6 */
+#define VIA686A_REG_TEMP_LOW23	0x49
+
+#define VIA686A_REG_ALARM1	0x41
+#define VIA686A_REG_ALARM2	0x42
+#define VIA686A_REG_FANDIV	0x47
+#define VIA686A_REG_CONFIG	0x40
+/* The following register sets temp interrupt mode (bits 1-0 for temp1,
+ 3-2 for temp2, 5-4 for temp3).  Modes are:
+    00 interrupt stays as long as value is out-of-range
+    01 interrupt is cleared once register is read (default)
+    10 comparator mode- like 00, but ignores hysteresis
+    11 same as 00 */
+#define VIA686A_REG_TEMP_MODE		0x4b
+/* We'll just assume that you want to set all 3 simultaneously: */
+#define VIA686A_TEMP_MODE_MASK		0x3F
+#define VIA686A_TEMP_MODE_CONTINUOUS	0x00
+
+/* Conversions. Limit checking is only done on the TO_REG
+   variants.
+
+********* VOLTAGE CONVERSIONS (Bob Dougherty) ********
+ From HWMon.cpp (Copyright 1998-2000 Jonathan Teh Soon Yew):
+ voltagefactor[0]=1.25/2628; (2628/1.25=2102.4)   // Vccp
+ voltagefactor[1]=1.25/2628; (2628/1.25=2102.4)   // +2.5V
+ voltagefactor[2]=1.67/2628; (2628/1.67=1573.7)   // +3.3V
+ voltagefactor[3]=2.6/2628;  (2628/2.60=1010.8)   // +5V
+ voltagefactor[4]=6.3/2628;  (2628/6.30=417.14)   // +12V
+ in[i]=(data[i+2]*25.0+133)*voltagefactor[i];
+ That is:
+ volts = (25*regVal+133)*factor
+ regVal = (volts/factor-133)/25
+ (These conversions were contributed by Jonathan Teh Soon Yew
+ <j.teh@iname.com>) */
+static inline u8 IN_TO_REG(long val, int inNum)
+{
+	/* To avoid floating point, we multiply constants by 10 (100 for +12V).
+	   Rounding is done (120500 is actually 133000 - 12500).
+	   Remember that val is expressed in 0.001V/bit, which is why we divide
+	   by an additional 10000 (100000 for +12V): 1000 for val and 10 (100)
+	   for the constants. */
+	if (inNum <= 1)
+		return (u8)
+		    SENSORS_LIMIT((val * 21024 - 1205000) / 250000, 0, 255);
+	else if (inNum == 2)
+		return (u8)
+		    SENSORS_LIMIT((val * 15737 - 1205000) / 250000, 0, 255);
+	else if (inNum == 3)
+		return (u8)
+		    SENSORS_LIMIT((val * 10108 - 1205000) / 250000, 0, 255);
+	else
+		return (u8)
+		    SENSORS_LIMIT((val * 41714 - 12050000) / 2500000, 0, 255);
+}
+
+static inline long IN_FROM_REG(u8 val, int inNum)
+{
+	/* To avoid floating point, we multiply constants by 10 (100 for +12V).
+	   We also multiply them by 1000 because we want 0.001V/bit for the
+	   output value. Rounding is done. */
+	if (inNum <= 1)
+		return (long) ((250000 * val + 1330000 + 21024 / 2) / 21024);
+	else if (inNum == 2)
+		return (long) ((250000 * val + 1330000 + 15737 / 2) / 15737);
+	else if (inNum == 3)
+		return (long) ((250000 * val + 1330000 + 10108 / 2) / 10108);
+	else
+		return (long) ((2500000 * val + 13300000 + 41714 / 2) / 41714);
+}
+
+/********* FAN RPM CONVERSIONS ********/
+/* Higher register values = slower fans (the fan's strobe gates a counter).
+ But this chip saturates back at 0, not at 255 like all the other chips.
+ So, 0 means 0 RPM */
+static inline u8 FAN_TO_REG(long rpm, int div)
+{
+	if (rpm == 0)
+		return 0;
+	rpm = SENSORS_LIMIT(rpm, 1, 1000000);
+	return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 255);
+}
+
+#define FAN_FROM_REG(val,div) ((val)==0?0:(val)==255?0:1350000/((val)*(div)))
+
+/******** TEMP CONVERSIONS (Bob Dougherty) *********/
+/* linear fits from HWMon.cpp (Copyright 1998-2000 Jonathan Teh Soon Yew)
+      if(temp<169)
+	      return double(temp)*0.427-32.08;
+      else if(temp>=169 && temp<=202)
+	      return double(temp)*0.582-58.16;
+      else
+	      return double(temp)*0.924-127.33;
+
+ A fifth-order polynomial fits the unofficial data (provided by Alex van
+ Kaam <darkside@chello.nl>) a bit better.  It also give more reasonable
+ numbers on my machine (ie. they agree with what my BIOS tells me).
+ Here's the fifth-order fit to the 8-bit data:
+ temp = 1.625093e-10*val^5 - 1.001632e-07*val^4 + 2.457653e-05*val^3 -
+	2.967619e-03*val^2 + 2.175144e-01*val - 7.090067e+0.
+
+ (2000-10-25- RFD: thanks to Uwe Andersen <uandersen@mayah.com> for
+ finding my typos in this formula!)
+
+ Alas, none of the elegant function-fit solutions will work because we
+ aren't allowed to use floating point in the kernel and doing it with
+ integers doesn't provide enough precision.  So we'll do boring old
+ look-up table stuff.  The unofficial data (see below) have effectively
+ 7-bit resolution (they are rounded to the nearest degree).  I'm assuming
+ that the transfer function of the device is monotonic and smooth, so a
+ smooth function fit to the data will allow us to get better precision.
+ I used the 5th-order poly fit described above and solved for
+ VIA register values 0-255.  I *10 before rounding, so we get tenth-degree
+ precision.  (I could have done all 1024 values for our 10-bit readings,
+ but the function is very linear in the useful range (0-80 deg C), so
+ we'll just use linear interpolation for 10-bit readings.)  So, tempLUT
+ is the temp at via register values 0-255: */
+static const long tempLUT[] =
+{ -709, -688, -667, -646, -627, -607, -589, -570, -553, -536, -519,
+	-503, -487, -471, -456, -442, -428, -414, -400, -387, -375,
+	-362, -350, -339, -327, -316, -305, -295, -285, -275, -265,
+	-255, -246, -237, -229, -220, -212, -204, -196, -188, -180,
+	-173, -166, -159, -152, -145, -139, -132, -126, -120, -114,
+	-108, -102, -96, -91, -85, -80, -74, -69, -64, -59, -54, -49,
+	-44, -39, -34, -29, -25, -20, -15, -11, -6, -2, 3, 7, 12, 16,
+	20, 25, 29, 33, 37, 42, 46, 50, 54, 59, 63, 67, 71, 75, 79, 84,
+	88, 92, 96, 100, 104, 109, 113, 117, 121, 125, 130, 134, 138,
+	142, 146, 151, 155, 159, 163, 168, 172, 176, 181, 185, 189,
+	193, 198, 202, 206, 211, 215, 219, 224, 228, 232, 237, 241,
+	245, 250, 254, 259, 263, 267, 272, 276, 281, 285, 290, 294,
+	299, 303, 307, 312, 316, 321, 325, 330, 334, 339, 344, 348,
+	353, 357, 362, 366, 371, 376, 380, 385, 390, 395, 399, 404,
+	409, 414, 419, 423, 428, 433, 438, 443, 449, 454, 459, 464,
+	469, 475, 480, 486, 491, 497, 502, 508, 514, 520, 526, 532,
+	538, 544, 551, 557, 564, 571, 578, 584, 592, 599, 606, 614,
+	621, 629, 637, 645, 654, 662, 671, 680, 689, 698, 708, 718,
+	728, 738, 749, 759, 770, 782, 793, 805, 818, 830, 843, 856,
+	870, 883, 898, 912, 927, 943, 958, 975, 991, 1008, 1026, 1044,
+	1062, 1081, 1101, 1121, 1141, 1162, 1184, 1206, 1229, 1252,
+	1276, 1301, 1326, 1352, 1378, 1406, 1434, 1462
+};
+
+/* the original LUT values from Alex van Kaam <darkside@chello.nl>
+   (for via register values 12-240):
+{-50,-49,-47,-45,-43,-41,-39,-38,-37,-35,-34,-33,-32,-31,
+-30,-29,-28,-27,-26,-25,-24,-24,-23,-22,-21,-20,-20,-19,-18,-17,-17,-16,-15,
+-15,-14,-14,-13,-12,-12,-11,-11,-10,-9,-9,-8,-8,-7,-7,-6,-6,-5,-5,-4,-4,-3,
+-3,-2,-2,-1,-1,0,0,1,1,1,3,3,3,4,4,4,5,5,5,6,6,7,7,8,8,9,9,9,10,10,11,11,12,
+12,12,13,13,13,14,14,15,15,16,16,16,17,17,18,18,19,19,20,20,21,21,21,22,22,
+22,23,23,24,24,25,25,26,26,26,27,27,27,28,28,29,29,30,30,30,31,31,32,32,33,
+33,34,34,35,35,35,36,36,37,37,38,38,39,39,40,40,41,41,42,42,43,43,44,44,45,
+45,46,46,47,48,48,49,49,50,51,51,52,52,53,53,54,55,55,56,57,57,58,59,59,60,
+61,62,62,63,64,65,66,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,83,84,
+85,86,88,89,91,92,94,96,97,99,101,103,105,107,109,110};
+
+
+ Here's the reverse LUT.  I got it by doing a 6-th order poly fit (needed
+ an extra term for a good fit to these inverse data!) and then
+ solving for each temp value from -50 to 110 (the useable range for
+ this chip).  Here's the fit:
+ viaRegVal = -1.160370e-10*val^6 +3.193693e-08*val^5 - 1.464447e-06*val^4
+ - 2.525453e-04*val^3 + 1.424593e-02*val^2 + 2.148941e+00*val +7.275808e+01)
+ Note that n=161: */
+static const u8 viaLUT[] =
+{ 12, 12, 13, 14, 14, 15, 16, 16, 17, 18, 18, 19, 20, 20, 21, 22, 23,
+	23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 35, 36, 37, 39, 40,
+	41, 43, 45, 46, 48, 49, 51, 53, 55, 57, 59, 60, 62, 64, 66,
+	69, 71, 73, 75, 77, 79, 82, 84, 86, 88, 91, 93, 95, 98, 100,
+	103, 105, 107, 110, 112, 115, 117, 119, 122, 124, 126, 129,
+	131, 134, 136, 138, 140, 143, 145, 147, 150, 152, 154, 156,
+	158, 160, 162, 164, 166, 168, 170, 172, 174, 176, 178, 180,
+	182, 183, 185, 187, 188, 190, 192, 193, 195, 196, 198, 199,
+	200, 202, 203, 205, 206, 207, 208, 209, 210, 211, 212, 213,
+	214, 215, 216, 217, 218, 219, 220, 221, 222, 222, 223, 224,
+	225, 226, 226, 227, 228, 228, 229, 230, 230, 231, 232, 232,
+	233, 233, 234, 235, 235, 236, 236, 237, 237, 238, 238, 239,
+	239, 240
+};
+
+/* Converting temps to (8-bit) hyst and over registers
+   No interpolation here.
+   The +50 is because the temps start at -50 */
+static inline u8 TEMP_TO_REG(long val)
+{
+	return viaLUT[val <= -50000 ? 0 : val >= 110000 ? 160 :
+		      (val < 0 ? val - 500 : val + 500) / 1000 + 50];
+}
+
+/* for 8-bit temperature hyst and over registers */
+#define TEMP_FROM_REG(val) (tempLUT[(val)] * 100)
+
+/* for 10-bit temperature readings */
+static inline long TEMP_FROM_REG10(u16 val)
+{
+	u16 eightBits = val >> 2;
+	u16 twoBits = val & 3;
+
+	/* no interpolation for these */
+	if (twoBits == 0 || eightBits == 255)
+		return TEMP_FROM_REG(eightBits);
+
+	/* do some linear interpolation */
+	return (tempLUT[eightBits] * (4 - twoBits) +
+		tempLUT[eightBits + 1] * twoBits) * 25;
+}
+
+#define DIV_FROM_REG(val) (1 << (val))
+#define DIV_TO_REG(val) ((val)==8?3:(val)==4?2:(val)==1?0:1)
+
+/* For the VIA686A, we need to keep some data in memory.
+   The structure is dynamically allocated, at the same time when a new
+   via686a client is allocated. */
+struct via686a_data {
+	struct i2c_client client;
+	struct semaphore update_lock;
+	char valid;		/* !=0 if following fields are valid */
+	unsigned long last_updated;	/* In jiffies */
+
+	u8 in[5];		/* Register value */
+	u8 in_max[5];		/* Register value */
+	u8 in_min[5];		/* Register value */
+	u8 fan[2];		/* Register value */
+	u8 fan_min[2];		/* Register value */
+	u16 temp[3];		/* Register value 10 bit */
+	u8 temp_over[3];	/* Register value */
+	u8 temp_hyst[3];	/* Register value */
+	u8 fan_div[2];		/* Register encoding, shifted right */
+	u16 alarms;		/* Register encoding, combined */
+};
+
+static struct pci_dev *s_bridge;	/* pointer to the (only) via686a */
+
+static int via686a_attach_adapter(struct i2c_adapter *adapter);
+static int via686a_detect(struct i2c_adapter *adapter, int address, int kind);
+static int via686a_detach_client(struct i2c_client *client);
+
+static inline int via686a_read_value(struct i2c_client *client, u8 reg)
+{
+	return (inb_p(client->addr + reg));
+}
+
+static inline void via686a_write_value(struct i2c_client *client, u8 reg,
+				       u8 value)
+{
+	outb_p(value, client->addr + reg);
+}
+
+static struct via686a_data *via686a_update_device(struct device *dev);
+static void via686a_init_client(struct i2c_client *client);
+
+/* following are the sysfs callback functions */
+
+/* 7 voltage sensors */
+static ssize_t show_in(struct device *dev, char *buf, int nr) {
+	struct via686a_data *data = via686a_update_device(dev);
+	return sprintf(buf, "%ld\n", IN_FROM_REG(data->in[nr], nr));
+}
+
+static ssize_t show_in_min(struct device *dev, char *buf, int nr) {
+	struct via686a_data *data = via686a_update_device(dev);
+	return sprintf(buf, "%ld\n", IN_FROM_REG(data->in_min[nr], nr));
+}
+
+static ssize_t show_in_max(struct device *dev, char *buf, int nr) {
+	struct via686a_data *data = via686a_update_device(dev);
+	return sprintf(buf, "%ld\n", IN_FROM_REG(data->in_max[nr], nr));
+}
+
+static ssize_t set_in_min(struct device *dev, const char *buf,
+		size_t count, int nr) {
+	struct i2c_client *client = to_i2c_client(dev);
+	struct via686a_data *data = i2c_get_clientdata(client);
+	unsigned long val = simple_strtoul(buf, NULL, 10);
+
+	down(&data->update_lock);
+	data->in_min[nr] = IN_TO_REG(val, nr);
+	via686a_write_value(client, VIA686A_REG_IN_MIN(nr),
+			data->in_min[nr]);
+	up(&data->update_lock);
+	return count;
+}
+static ssize_t set_in_max(struct device *dev, const char *buf,
+		size_t count, int nr) {
+	struct i2c_client *client = to_i2c_client(dev);
+	struct via686a_data *data = i2c_get_clientdata(client);
+	unsigned long val = simple_strtoul(buf, NULL, 10);
+
+	down(&data->update_lock);
+	data->in_max[nr] = IN_TO_REG(val, nr);
+	via686a_write_value(client, VIA686A_REG_IN_MAX(nr),
+			data->in_max[nr]);
+	up(&data->update_lock);
+	return count;
+}
+#define show_in_offset(offset)					\
+static ssize_t 							\
+	show_in##offset (struct device *dev, struct device_attribute *attr, char *buf)		\
+{								\
+	return show_in(dev, buf, offset);			\
+}								\
+static ssize_t 							\
+	show_in##offset##_min (struct device *dev, struct device_attribute *attr, char *buf)	\
+{								\
+	return show_in_min(dev, buf, offset);		\
+}								\
+static ssize_t 							\
+	show_in##offset##_max (struct device *dev, struct device_attribute *attr, char *buf)	\
+{								\
+	return show_in_max(dev, buf, offset);		\
+}								\
+static ssize_t set_in##offset##_min (struct device *dev, struct device_attribute *attr, 	\
+		const char *buf, size_t count) 			\
+{								\
+	return set_in_min(dev, buf, count, offset);		\
+}								\
+static ssize_t set_in##offset##_max (struct device *dev, struct device_attribute *attr,	\
+			const char *buf, size_t count)		\
+{								\
+	return set_in_max(dev, buf, count, offset);		\
+}								\
+static DEVICE_ATTR(in##offset##_input, S_IRUGO, show_in##offset, NULL);\
+static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, 	\
+		show_in##offset##_min, set_in##offset##_min);	\
+static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, 	\
+		show_in##offset##_max, set_in##offset##_max);
+
+show_in_offset(0);
+show_in_offset(1);
+show_in_offset(2);
+show_in_offset(3);
+show_in_offset(4);
+
+/* 3 temperatures */
+static ssize_t show_temp(struct device *dev, char *buf, int nr) {
+	struct via686a_data *data = via686a_update_device(dev);
+	return sprintf(buf, "%ld\n", TEMP_FROM_REG10(data->temp[nr]));
+}
+static ssize_t show_temp_over(struct device *dev, char *buf, int nr) {
+	struct via686a_data *data = via686a_update_device(dev);
+	return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp_over[nr]));
+}
+static ssize_t show_temp_hyst(struct device *dev, char *buf, int nr) {
+	struct via686a_data *data = via686a_update_device(dev);
+	return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp_hyst[nr]));
+}
+static ssize_t set_temp_over(struct device *dev, const char *buf,
+		size_t count, int nr) {
+	struct i2c_client *client = to_i2c_client(dev);
+	struct via686a_data *data = i2c_get_clientdata(client);
+	int val = simple_strtol(buf, NULL, 10);
+
+	down(&data->update_lock);
+	data->temp_over[nr] = TEMP_TO_REG(val);
+	via686a_write_value(client, VIA686A_REG_TEMP_OVER[nr],
+			    data->temp_over[nr]);
+	up(&data->update_lock);
+	return count;
+}
+static ssize_t set_temp_hyst(struct device *dev, const char *buf,
+		size_t count, int nr) {
+	struct i2c_client *client = to_i2c_client(dev);
+	struct via686a_data *data = i2c_get_clientdata(client);
+	int val = simple_strtol(buf, NULL, 10);
+
+	down(&data->update_lock);
+	data->temp_hyst[nr] = TEMP_TO_REG(val);
+	via686a_write_value(client, VIA686A_REG_TEMP_HYST[nr],
+			    data->temp_hyst[nr]);
+	up(&data->update_lock);
+	return count;
+}
+#define show_temp_offset(offset)					\
+static ssize_t show_temp_##offset (struct device *dev, struct device_attribute *attr, char *buf)	\
+{									\
+	return show_temp(dev, buf, offset - 1);				\
+}									\
+static ssize_t								\
+show_temp_##offset##_over (struct device *dev, struct device_attribute *attr, char *buf)		\
+{									\
+	return show_temp_over(dev, buf, offset - 1);			\
+}									\
+static ssize_t								\
+show_temp_##offset##_hyst (struct device *dev, struct device_attribute *attr, char *buf)		\
+{									\
+	return show_temp_hyst(dev, buf, offset - 1);			\
+}									\
+static ssize_t set_temp_##offset##_over (struct device *dev, struct device_attribute *attr, 		\
+		const char *buf, size_t count) 				\
+{									\
+	return set_temp_over(dev, buf, count, offset - 1);		\
+}									\
+static ssize_t set_temp_##offset##_hyst (struct device *dev, struct device_attribute *attr, 		\
+		const char *buf, size_t count) 				\
+{									\
+	return set_temp_hyst(dev, buf, count, offset - 1);		\
+}									\
+static DEVICE_ATTR(temp##offset##_input, S_IRUGO, show_temp_##offset, NULL);\
+static DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, 		\
+		show_temp_##offset##_over, set_temp_##offset##_over);	\
+static DEVICE_ATTR(temp##offset##_max_hyst, S_IRUGO | S_IWUSR, 		\
+		show_temp_##offset##_hyst, set_temp_##offset##_hyst);
+
+show_temp_offset(1);
+show_temp_offset(2);
+show_temp_offset(3);
+
+/* 2 Fans */
+static ssize_t show_fan(struct device *dev, char *buf, int nr) {
+	struct via686a_data *data = via686a_update_device(dev);
+	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
+				DIV_FROM_REG(data->fan_div[nr])) );
+}
+static ssize_t show_fan_min(struct device *dev, char *buf, int nr) {
+	struct via686a_data *data = via686a_update_device(dev);
+	return sprintf(buf, "%d\n",
+		FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr])) );
+}
+static ssize_t show_fan_div(struct device *dev, char *buf, int nr) {
+	struct via686a_data *data = via686a_update_device(dev);
+	return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]) );
+}
+static ssize_t set_fan_min(struct device *dev, const char *buf,
+		size_t count, int nr) {
+	struct i2c_client *client = to_i2c_client(dev);
+	struct via686a_data *data = i2c_get_clientdata(client);
+	int val = simple_strtol(buf, NULL, 10);
+
+	down(&data->update_lock);
+	data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
+	via686a_write_value(client, VIA686A_REG_FAN_MIN(nr+1), data->fan_min[nr]);
+	up(&data->update_lock);
+	return count;
+}
+static ssize_t set_fan_div(struct device *dev, const char *buf,
+		size_t count, int nr) {
+	struct i2c_client *client = to_i2c_client(dev);
+	struct via686a_data *data = i2c_get_clientdata(client);
+	int val = simple_strtol(buf, NULL, 10);
+	int old;
+
+	down(&data->update_lock);
+	old = via686a_read_value(client, VIA686A_REG_FANDIV);
+	data->fan_div[nr] = DIV_TO_REG(val);
+	old = (old & 0x0f) | (data->fan_div[1] << 6) | (data->fan_div[0] << 4);
+	via686a_write_value(client, VIA686A_REG_FANDIV, old);
+	up(&data->update_lock);
+	return count;
+}
+
+#define show_fan_offset(offset)						\
+static ssize_t show_fan_##offset (struct device *dev, struct device_attribute *attr, char *buf)	\
+{									\
+	return show_fan(dev, buf, offset - 1);				\
+}									\
+static ssize_t show_fan_##offset##_min (struct device *dev, struct device_attribute *attr, char *buf)	\
+{									\
+	return show_fan_min(dev, buf, offset - 1);			\
+}									\
+static ssize_t show_fan_##offset##_div (struct device *dev, struct device_attribute *attr, char *buf)	\
+{									\
+	return show_fan_div(dev, buf, offset - 1);			\
+}									\
+static ssize_t set_fan_##offset##_min (struct device *dev, struct device_attribute *attr, 		\
+	const char *buf, size_t count) 					\
+{									\
+	return set_fan_min(dev, buf, count, offset - 1);		\
+}									\
+static ssize_t set_fan_##offset##_div (struct device *dev, struct device_attribute *attr, 		\
+		const char *buf, size_t count) 				\
+{									\
+	return set_fan_div(dev, buf, count, offset - 1);		\
+}									\
+static DEVICE_ATTR(fan##offset##_input, S_IRUGO, show_fan_##offset, NULL);\
+static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, 		\
+		show_fan_##offset##_min, set_fan_##offset##_min);	\
+static DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, 		\
+		show_fan_##offset##_div, set_fan_##offset##_div);
+
+show_fan_offset(1);
+show_fan_offset(2);
+
+/* Alarms */
+static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf) {
+	struct via686a_data *data = via686a_update_device(dev);
+	return sprintf(buf, "%u\n", data->alarms);
+}
+static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
+
+/* The driver. I choose to use type i2c_driver, as at is identical to both
+   smbus_driver and isa_driver, and clients could be of either kind */
+static struct i2c_driver via686a_driver = {
+	.owner		= THIS_MODULE,
+	.name		= "via686a",
+	.id		= I2C_DRIVERID_VIA686A,
+	.flags		= I2C_DF_NOTIFY,
+	.attach_adapter	= via686a_attach_adapter,
+	.detach_client	= via686a_detach_client,
+};
+
+
+/* This is called when the module is loaded */
+static int via686a_attach_adapter(struct i2c_adapter *adapter)
+{
+	if (!(adapter->class & I2C_CLASS_HWMON))
+		return 0;
+	return i2c_detect(adapter, &addr_data, via686a_detect);
+}
+
+static int via686a_detect(struct i2c_adapter *adapter, int address, int kind)
+{
+	struct i2c_client *new_client;
+	struct via686a_data *data;
+	int err = 0;
+	const char client_name[] = "via686a";
+	u16 val;
+
+	/* Make sure we are probing the ISA bus!!  */
+	if (!i2c_is_isa_adapter(adapter)) {
+		dev_err(&adapter->dev,
+		"via686a_detect called for an I2C bus adapter?!?\n");
+		return 0;
+	}
+
+	/* 8231 requires multiple of 256, we enforce that on 686 as well */
+	if (force_addr)
+		address = force_addr & 0xFF00;
+
+	if (force_addr) {
+		dev_warn(&adapter->dev, "forcing ISA address 0x%04X\n",
+			 address);
+		if (PCIBIOS_SUCCESSFUL !=
+		    pci_write_config_word(s_bridge, VIA686A_BASE_REG, address))
+			return -ENODEV;
+	}
+	if (PCIBIOS_SUCCESSFUL !=
+	    pci_read_config_word(s_bridge, VIA686A_ENABLE_REG, &val))
+		return -ENODEV;
+	if (!(val & 0x0001)) {
+		dev_warn(&adapter->dev, "enabling sensors\n");
+		if (PCIBIOS_SUCCESSFUL !=
+		    pci_write_config_word(s_bridge, VIA686A_ENABLE_REG,
+					  val | 0x0001))
+			return -ENODEV;
+	}
+
+	/* Reserve the ISA region */
+	if (!request_region(address, VIA686A_EXTENT, via686a_driver.name)) {
+		dev_err(&adapter->dev, "region 0x%x already in use!\n",
+			address);
+		return -ENODEV;
+	}
+
+	if (!(data = kmalloc(sizeof(struct via686a_data), GFP_KERNEL))) {
+		err = -ENOMEM;
+		goto ERROR0;
+	}
+	memset(data, 0, sizeof(struct via686a_data));
+
+	new_client = &data->client;
+	i2c_set_clientdata(new_client, data);
+	new_client->addr = address;
+	new_client->adapter = adapter;
+	new_client->driver = &via686a_driver;
+	new_client->flags = 0;
+
+	/* Fill in the remaining client fields and put into the global list */
+	strlcpy(new_client->name, client_name, I2C_NAME_SIZE);
+
+	data->valid = 0;
+	init_MUTEX(&data->update_lock);
+	/* Tell the I2C layer a new client has arrived */
+	if ((err = i2c_attach_client(new_client)))
+		goto ERROR3;
+
+	/* Initialize the VIA686A chip */
+	via686a_init_client(new_client);
+
+	/* Register sysfs hooks */
+	device_create_file(&new_client->dev, &dev_attr_in0_input);
+	device_create_file(&new_client->dev, &dev_attr_in1_input);
+	device_create_file(&new_client->dev, &dev_attr_in2_input);
+	device_create_file(&new_client->dev, &dev_attr_in3_input);
+	device_create_file(&new_client->dev, &dev_attr_in4_input);
+	device_create_file(&new_client->dev, &dev_attr_in0_min);
+	device_create_file(&new_client->dev, &dev_attr_in1_min);
+	device_create_file(&new_client->dev, &dev_attr_in2_min);
+	device_create_file(&new_client->dev, &dev_attr_in3_min);
+	device_create_file(&new_client->dev, &dev_attr_in4_min);
+	device_create_file(&new_client->dev, &dev_attr_in0_max);
+	device_create_file(&new_client->dev, &dev_attr_in1_max);
+	device_create_file(&new_client->dev, &dev_attr_in2_max);
+	device_create_file(&new_client->dev, &dev_attr_in3_max);
+	device_create_file(&new_client->dev, &dev_attr_in4_max);
+	device_create_file(&new_client->dev, &dev_attr_temp1_input);
+	device_create_file(&new_client->dev, &dev_attr_temp2_input);
+	device_create_file(&new_client->dev, &dev_attr_temp3_input);
+	device_create_file(&new_client->dev, &dev_attr_temp1_max);
+	device_create_file(&new_client->dev, &dev_attr_temp2_max);
+	device_create_file(&new_client->dev, &dev_attr_temp3_max);
+	device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst);
+	device_create_file(&new_client->dev, &dev_attr_temp2_max_hyst);
+	device_create_file(&new_client->dev, &dev_attr_temp3_max_hyst);
+	device_create_file(&new_client->dev, &dev_attr_fan1_input);
+	device_create_file(&new_client->dev, &dev_attr_fan2_input);
+	device_create_file(&new_client->dev, &dev_attr_fan1_min);
+	device_create_file(&new_client->dev, &dev_attr_fan2_min);
+	device_create_file(&new_client->dev, &dev_attr_fan1_div);
+	device_create_file(&new_client->dev, &dev_attr_fan2_div);
+	device_create_file(&new_client->dev, &dev_attr_alarms);
+
+	return 0;
+
+ERROR3:
+	kfree(data);
+ERROR0:
+	release_region(address, VIA686A_EXTENT);
+	return err;
+}
+
+static int via686a_detach_client(struct i2c_client *client)
+{
+	int err;
+
+	if ((err = i2c_detach_client(client))) {
+		dev_err(&client->dev,
+		"Client deregistration failed, client not detached.\n");
+		return err;
+	}
+
+	release_region(client->addr, VIA686A_EXTENT);
+	kfree(i2c_get_clientdata(client));
+
+	return 0;
+}
+
+/* Called when we have found a new VIA686A. Set limits, etc. */
+static void via686a_init_client(struct i2c_client *client)
+{
+	u8 reg;
+
+	/* Start monitoring */
+	reg = via686a_read_value(client, VIA686A_REG_CONFIG);
+	via686a_write_value(client, VIA686A_REG_CONFIG, (reg|0x01)&0x7F);
+
+	/* Configure temp interrupt mode for continuous-interrupt operation */
+	via686a_write_value(client, VIA686A_REG_TEMP_MODE,
+			    via686a_read_value(client, VIA686A_REG_TEMP_MODE) &
+			    !(VIA686A_TEMP_MODE_MASK | VIA686A_TEMP_MODE_CONTINUOUS));
+}
+
+static struct via686a_data *via686a_update_device(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct via686a_data *data = i2c_get_clientdata(client);
+	int i;
+
+	down(&data->update_lock);
+
+	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
+	    || !data->valid) {
+		for (i = 0; i <= 4; i++) {
+			data->in[i] =
+			    via686a_read_value(client, VIA686A_REG_IN(i));
+			data->in_min[i] = via686a_read_value(client,
+							     VIA686A_REG_IN_MIN
+							     (i));
+			data->in_max[i] =
+			    via686a_read_value(client, VIA686A_REG_IN_MAX(i));
+		}
+		for (i = 1; i <= 2; i++) {
+			data->fan[i - 1] =
+			    via686a_read_value(client, VIA686A_REG_FAN(i));
+			data->fan_min[i - 1] = via686a_read_value(client,
+						     VIA686A_REG_FAN_MIN(i));
+		}
+		for (i = 0; i <= 2; i++) {
+			data->temp[i] = via686a_read_value(client,
+						 VIA686A_REG_TEMP[i]) << 2;
+			data->temp_over[i] =
+			    via686a_read_value(client,
+					       VIA686A_REG_TEMP_OVER[i]);
+			data->temp_hyst[i] =
+			    via686a_read_value(client,
+					       VIA686A_REG_TEMP_HYST[i]);
+		}
+		/* add in lower 2 bits
+		   temp1 uses bits 7-6 of VIA686A_REG_TEMP_LOW1
+		   temp2 uses bits 5-4 of VIA686A_REG_TEMP_LOW23
+		   temp3 uses bits 7-6 of VIA686A_REG_TEMP_LOW23
+		 */
+		data->temp[0] |= (via686a_read_value(client,
+						     VIA686A_REG_TEMP_LOW1)
+				  & 0xc0) >> 6;
+		data->temp[1] |=
+		    (via686a_read_value(client, VIA686A_REG_TEMP_LOW23) &
+		     0x30) >> 4;
+		data->temp[2] |=
+		    (via686a_read_value(client, VIA686A_REG_TEMP_LOW23) &
+		     0xc0) >> 6;
+
+		i = via686a_read_value(client, VIA686A_REG_FANDIV);
+		data->fan_div[0] = (i >> 4) & 0x03;
+		data->fan_div[1] = i >> 6;
+		data->alarms =
+		    via686a_read_value(client,
+				       VIA686A_REG_ALARM1) |
+		    (via686a_read_value(client, VIA686A_REG_ALARM2) << 8);
+		data->last_updated = jiffies;
+		data->valid = 1;
+	}
+
+	up(&data->update_lock);
+
+	return data;
+}
+
+static struct pci_device_id via686a_pci_ids[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_4) },
+	{ 0, }
+};
+
+MODULE_DEVICE_TABLE(pci, via686a_pci_ids);
+
+static int __devinit via686a_pci_probe(struct pci_dev *dev,
+				       const struct pci_device_id *id)
+{
+	u16 val;
+	int addr = 0;
+
+	if (PCIBIOS_SUCCESSFUL !=
+	    pci_read_config_word(dev, VIA686A_BASE_REG, &val))
+		return -ENODEV;
+
+	addr = val & ~(VIA686A_EXTENT - 1);
+	if (addr == 0 && force_addr == 0) {
+		dev_err(&dev->dev, "base address not set - upgrade BIOS "
+			"or use force_addr=0xaddr\n");
+		return -ENODEV;
+	}
+	if (force_addr)
+		addr = force_addr;	/* so detect will get called */
+
+	if (!addr) {
+		dev_err(&dev->dev, "No Via 686A sensors found.\n");
+		return -ENODEV;
+	}
+	normal_isa[0] = addr;
+
+	s_bridge = pci_dev_get(dev);
+	if (i2c_add_driver(&via686a_driver)) {
+		pci_dev_put(s_bridge);
+		s_bridge = NULL;
+	}
+
+	/* Always return failure here.  This is to allow other drivers to bind
+	 * to this pci device.  We don't really want to have control over the
+	 * pci device, we only wanted to read as few register values from it.
+	 */
+	return -ENODEV;
+}
+
+static struct pci_driver via686a_pci_driver = {
+	.name		= "via686a",
+	.id_table	= via686a_pci_ids,
+	.probe		= via686a_pci_probe,
+};
+
+static int __init sm_via686a_init(void)
+{
+	return pci_register_driver(&via686a_pci_driver);
+}
+
+static void __exit sm_via686a_exit(void)
+{
+	pci_unregister_driver(&via686a_pci_driver);
+	if (s_bridge != NULL) {
+		i2c_del_driver(&via686a_driver);
+		pci_dev_put(s_bridge);
+		s_bridge = NULL;
+	}
+}
+
+MODULE_AUTHOR("Kyösti Mälkki <kmalkki@cc.hut.fi>, "
+	      "Mark Studebaker <mdsxyz123@yahoo.com> "
+	      "and Bob Dougherty <bobd@stanford.edu>");
+MODULE_DESCRIPTION("VIA 686A Sensor device");
+MODULE_LICENSE("GPL");
+
+module_init(sm_via686a_init);
+module_exit(sm_via686a_exit);