Re: [PATCH] More i2c driver changes for 2.5.66

Greg KH
2003-04-03T00:10:00Z

ChangeSet 1.977.29.2, 2003/03/25 17:29:08-08:00, j.dittmer@portrix.net

[PATCH] i2c: add i2c-via686a driver

drivers/i2c/chips/Kconfig | 13
drivers/i2c/chips/Makefile | 1
drivers/i2c/chips/via686a.c | 952 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 966 insertions(+)

diff -Nru a/drivers/i2c/chips/Kconfig b/drivers/i2c/chips/Kconfig
--- a/drivers/i2c/chips/Kconfig Wed Apr 2 16:02:02 2003
+++ b/drivers/i2c/chips/Kconfig Wed Apr 2 16:02:02 2003
@@ -37,4 +37,17 @@
in the lm_sensors package, which you can download at
http://www.lm-sensors.nu

+config SENSORS_VIA686A
+ tristate " VIA686A"
+ depends on I2C && I2C_PROC
+ help
+ support for via686a
+ If you say yes here you get support for the integrated sensors in
+ Via 686A/B South Bridges. This can also be built as a module
+ which can be inserted and removed while the kernel is running.
+
+ You will also need the latest user-space utilties: you can find them
+ in the lm_sensors package, which you can download at
+ http://www.lm-sensors.nu
+
endmenu
diff -Nru a/drivers/i2c/chips/Makefile b/drivers/i2c/chips/Makefile
--- a/drivers/i2c/chips/Makefile Wed Apr 2 16:02:02 2003
+++ b/drivers/i2c/chips/Makefile Wed Apr 2 16:02:02 2003
@@ -4,3 +4,4 @@

obj-$(CONFIG_SENSORS_ADM1021) += adm1021.o
obj-$(CONFIG_SENSORS_LM75) += lm75.o
+obj-$(CONFIG_SENSORS_VIA686A) += via686a.o
diff -Nru a/drivers/i2c/chips/via686a.c b/drivers/i2c/chips/via686a.c
--- /dev/null Wed Dec 31 16:00:00 1969
+++ b/drivers/i2c/chips/via686a.c Wed Apr 2 16:02:02 2003
@@ -0,0 +1,952 @@
+/*
+ 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.
+ See doc/chips/via686a for details.
+ Warning - only supports a single device.
+*/
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/i2c-proc.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 int force_addr = 0;
+MODULE_PARM(force_addr, "i");
+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[] = { SENSORS_I2C_END };
+static unsigned short normal_i2c_range[] = { SENSORS_I2C_END };
+static unsigned int normal_isa[] = { 0x0000, SENSORS_ISA_END };
+static unsigned int normal_isa_range[] = { SENSORS_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))
+
+/* the following values are as speced by VIA: */
+static const u8 regtemp[] = { 0x20, 0x21, 0x1f };
+static const u8 regover[] = { 0x39, 0x3d, 0x1d };
+static const u8 reghyst[] = { 0x3a, 0x3e, 0x1e };
+
+/* temps numbered 1-3 */
+#define VIA686A_REG_TEMP(nr) (regtemp[(nr) - 1])
+#define VIA686A_REG_TEMP_OVER(nr) (regover[(nr) - 1])
+#define VIA686A_REG_TEMP_HYST(nr) (reghyst[(nr) - 1])
+#define VIA686A_REG_TEMP_LOW1 0x4b // bits 7-6
+#define VIA686A_REG_TEMP_LOW23 0x49 // 2 = bits 5-4, 3 = bits 7-6
+
+#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. Rounding and 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>)
+
+ These get us close, but they don't completely agree with what my BIOS
+ says- they are all a bit low. But, it all we have to go on... */
+static inline u8 IN_TO_REG(long val, int inNum)
+{
+ /* to avoid floating point, we multiply everything by 100.
+ val is guaranteed to be positive, so we can achieve the effect of
+ rounding by (...*10+5)/10. Note that the *10 is hidden in the
+ /250 (which should really be /2500).
+ At the end, we need to /100 because we *100 everything and we need
+ to /10 because of the rounding thing, so we /1000. */
+ if (inNum <= 1)
+ return (u8)
+ SENSORS_LIMIT(((val * 210240 - 13300) / 250 + 5) / 1000,
+ 0, 255);
+ else if (inNum == 2)
+ return (u8)
+ SENSORS_LIMIT(((val * 157370 - 13300) / 250 + 5) / 1000,
+ 0, 255);
+ else if (inNum == 3)
+ return (u8)
+ SENSORS_LIMIT(((val * 101080 - 13300) / 250 + 5) / 1000,
+ 0, 255);
+ else
+ return (u8) SENSORS_LIMIT(((val * 41714 - 13300) / 250 + 5)
+ / 1000, 0, 255);
+}
+
+static inline long IN_FROM_REG(u8 val, int inNum)
+{
+ /* to avoid floating point, we multiply everything by 100.
+ val is guaranteed to be positive, so we can achieve the effect of
+ rounding by adding 0.5. Or, to avoid fp math, we do (...*10+5)/10.
+ We need to scale with *100 anyway, so no need to /100 at the end. */
+ if (inNum <= 1)
+ return (long) (((250000 * val + 13300) / 210240 * 10 + 5) /10);
+ else if (inNum == 2)
+ return (long) (((250000 * val + 13300) / 157370 * 10 + 5) /10);
+ else if (inNum == 3)
+ return (long) (((250000 * val + 13300) / 101080 * 10 + 5) /10);
+ else
+ return (long) (((250000 * val + 13300) / 41714 * 10 + 5) /10);
+}
+
+/********* 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 rpovide 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. Just check the limits and go.
+ The +5 effectively rounds off properly and the +50 is because
+ the temps start at -50 */
+static inline u8 TEMP_TO_REG(long val)
+{
+ return (u8)
+ SENSORS_LIMIT(viaLUT[((val <= -500) ? 0 : (val >= 1100) ? 160 :
+ ((val + 5) / 10 + 50))], 0, 255);
+}
+
+/* for 8-bit temperature hyst and over registers
+ The temp values are already *10, so we don't need to do that.
+ But we _will_ round these off to the nearest degree with (...*10+5)/10 */
+#define TEMP_FROM_REG(val) ((tempLUT[(val)]*10+5)/10)
+
+/* for 10-bit temperature readings
+ You might _think_ this is too long to inline, but's it's really only
+ called once... */
+static inline long TEMP_FROM_REG10(u16 val)
+{
+ /* the temp values are already *10, so we don't need to do that. */
+ long temp;
+ u16 eightBits = val >> 2;
+ u16 twoBits = val & 3;
+
+ /* handle the extremes first (they won't interpolate well! ;-) */
+ if (val == 0)
+ return (long) tempLUT[0];
+ if (val == 1023)
+ return (long) tempLUT[255];
+
+ if (twoBits == 0)
+ return (long) tempLUT[eightBits];
+ else {
+ /* do some interpolation by multipying the lower and upper
+ bounds by 25, 50 or 75, then /100. */
+ temp = ((25 * (4 - twoBits)) * tempLUT[eightBits]
+ + (25 * twoBits) * tempLUT[eightBits + 1]);
+ /* increase the magnitude by 50 to achieve rounding. */
+ if (temp > 0)
+ temp += 50;
+ else
+ temp -= 50;
+ return (temp / 100);
+ }
+}
+
+#define ALARMS_FROM_REG(val) (val)
+
+#define DIV_FROM_REG(val) (1 << (val))
+#define DIV_TO_REG(val) ((val)==8?3:(val)==4?2:(val)==1?0:1)
+
+/* Initial limits */
+#define VIA686A_INIT_IN_0 200
+#define VIA686A_INIT_IN_1 250
+#define VIA686A_INIT_IN_2 330
+#define VIA686A_INIT_IN_3 500
+#define VIA686A_INIT_IN_4 1200
+
+#define VIA686A_INIT_IN_PERCENTAGE 10
+
+#define VIA686A_INIT_IN_MIN_0 (VIA686A_INIT_IN_0 - VIA686A_INIT_IN_0 \
+ * VIA686A_INIT_IN_PERCENTAGE / 100)
+#define VIA686A_INIT_IN_MAX_0 (VIA686A_INIT_IN_0 + VIA686A_INIT_IN_0 \
+ * VIA686A_INIT_IN_PERCENTAGE / 100)
+#define VIA686A_INIT_IN_MIN_1 (VIA686A_INIT_IN_1 - VIA686A_INIT_IN_1 \
+ * VIA686A_INIT_IN_PERCENTAGE / 100)
+#define VIA686A_INIT_IN_MAX_1 (VIA686A_INIT_IN_1 + VIA686A_INIT_IN_1 \
+ * VIA686A_INIT_IN_PERCENTAGE / 100)
+#define VIA686A_INIT_IN_MIN_2 (VIA686A_INIT_IN_2 - VIA686A_INIT_IN_2 \
+ * VIA686A_INIT_IN_PERCENTAGE / 100)
+#define VIA686A_INIT_IN_MAX_2 (VIA686A_INIT_IN_2 + VIA686A_INIT_IN_2 \
+ * VIA686A_INIT_IN_PERCENTAGE / 100)
+#define VIA686A_INIT_IN_MIN_3 (VIA686A_INIT_IN_3 - VIA686A_INIT_IN_3 \
+ * VIA686A_INIT_IN_PERCENTAGE / 100)
+#define VIA686A_INIT_IN_MAX_3 (VIA686A_INIT_IN_3 + VIA686A_INIT_IN_3 \
+ * VIA686A_INIT_IN_PERCENTAGE / 100)
+#define VIA686A_INIT_IN_MIN_4 (VIA686A_INIT_IN_4 - VIA686A_INIT_IN_4 \
+ * VIA686A_INIT_IN_PERCENTAGE / 100)
+#define VIA686A_INIT_IN_MAX_4 (VIA686A_INIT_IN_4 + VIA686A_INIT_IN_4 \
+ * VIA686A_INIT_IN_PERCENTAGE / 100)
+
+#define VIA686A_INIT_FAN_MIN 3000
+
+#define VIA686A_INIT_TEMP_OVER 600
+#define VIA686A_INIT_TEMP_HYST 500
+
+/* For the VIA686A, we need to keep some data in memory. That
+ data is pointed to by via686a_list[NR]->data. The structure itself is
+ dynamically allocated, at the same time when a new via686a client is
+ allocated. */
+struct via686a_data {
+ int sysctl_id;
+
+ 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,
+ unsigned short flags, int kind);
+static int via686a_detach_client(struct i2c_client *client);
+
+static int via686a_read_value(struct i2c_client *client, u8 register);
+static void via686a_write_value(struct i2c_client *client, u8 register,
+ u8 value);
+static void via686a_update_client(struct i2c_client *client);
+static void via686a_init_client(struct i2c_client *client);
+
+
+static void via686a_in(struct i2c_client *client, int operation,
+ int ctl_name, int *nrels_mag, long *results);
+static void via686a_fan(struct i2c_client *client, int operation,
+ int ctl_name, int *nrels_mag, long *results);
+static void via686a_temp(struct i2c_client *client, int operation,
+ int ctl_name, int *nrels_mag, long *results);
+static void via686a_alarms(struct i2c_client *client, int operation,
+ int ctl_name, int *nrels_mag, long *results);
+static void via686a_fan_div(struct i2c_client *client, int operation,
+ int ctl_name, int *nrels_mag, long *results);
+
+static int via686a_id = 0;
+
+/* 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,
+};
+
+
+
+/* The /proc/sys entries */
+
+/* -- SENSORS SYSCTL START -- */
+#define VIA686A_SYSCTL_IN0 1000
+#define VIA686A_SYSCTL_IN1 1001
+#define VIA686A_SYSCTL_IN2 1002
+#define VIA686A_SYSCTL_IN3 1003
+#define VIA686A_SYSCTL_IN4 1004
+#define VIA686A_SYSCTL_FAN1 1101
+#define VIA686A_SYSCTL_FAN2 1102
+#define VIA686A_SYSCTL_TEMP 1200
+#define VIA686A_SYSCTL_TEMP2 1201
+#define VIA686A_SYSCTL_TEMP3 1202
+#define VIA686A_SYSCTL_FAN_DIV 2000
+#define VIA686A_SYSCTL_ALARMS 2001
+
+#define VIA686A_ALARM_IN0 0x01
+#define VIA686A_ALARM_IN1 0x02
+#define VIA686A_ALARM_IN2 0x04
+#define VIA686A_ALARM_IN3 0x08
+#define VIA686A_ALARM_TEMP 0x10
+#define VIA686A_ALARM_FAN1 0x40
+#define VIA686A_ALARM_FAN2 0x80
+#define VIA686A_ALARM_IN4 0x100
+#define VIA686A_ALARM_TEMP2 0x800
+#define VIA686A_ALARM_CHAS 0x1000
+#define VIA686A_ALARM_TEMP3 0x8000
+
+/* -- SENSORS SYSCTL END -- */
+
+/* These files are created for each detected VIA686A. This is just a template;
+ though at first sight, you might think we could use a statically
+ allocated list, we need some way to get back to the parent - which
+ is done through one of the 'extra' fields which are initialized
+ when a new copy is allocated. */
+static ctl_table via686a_dir_table_template[] = {
+ {VIA686A_SYSCTL_IN0, "in0", NULL, 0, 0644, NULL, &i2c_proc_real,
+ &i2c_sysctl_real, NULL, &via686a_in},
+ {VIA686A_SYSCTL_IN1, "in1", NULL, 0, 0644, NULL, &i2c_proc_real,
+ &i2c_sysctl_real, NULL, &via686a_in},
+ {VIA686A_SYSCTL_IN2, "in2", NULL, 0, 0644, NULL, &i2c_proc_real,
+ &i2c_sysctl_real, NULL, &via686a_in},
+ {VIA686A_SYSCTL_IN3, "in3", NULL, 0, 0644, NULL, &i2c_proc_real,
+ &i2c_sysctl_real, NULL, &via686a_in},
+ {VIA686A_SYSCTL_IN4, "in4", NULL, 0, 0644, NULL, &i2c_proc_real,
+ &i2c_sysctl_real, NULL, &via686a_in},
+ {VIA686A_SYSCTL_FAN1, "fan1", NULL, 0, 0644, NULL, &i2c_proc_real,
+ &i2c_sysctl_real, NULL, &via686a_fan},
+ {VIA686A_SYSCTL_FAN2, "fan2", NULL, 0, 0644, NULL, &i2c_proc_real,
+ &i2c_sysctl_real, NULL, &via686a_fan},
+ {VIA686A_SYSCTL_TEMP, "temp1", NULL, 0, 0644, NULL, &i2c_proc_real,
+ &i2c_sysctl_real, NULL, &via686a_temp},
+ {VIA686A_SYSCTL_TEMP2, "temp2", NULL, 0, 0644, NULL,
+ &i2c_proc_real, &i2c_sysctl_real, NULL, &via686a_temp},
+ {VIA686A_SYSCTL_TEMP3, "temp3", NULL, 0, 0644, NULL,
+ &i2c_proc_real, &i2c_sysctl_real, NULL, &via686a_temp},
+ {VIA686A_SYSCTL_FAN_DIV, "fan_div", NULL, 0, 0644, NULL,
+ &i2c_proc_real, &i2c_sysctl_real, NULL, &via686a_fan_div},
+ {VIA686A_SYSCTL_ALARMS, "alarms", NULL, 0, 0444, NULL,
+ &i2c_proc_real, &i2c_sysctl_real, NULL, &via686a_alarms},
+ {0}
+};
+
+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);
+}
+
+/* This is called when the module is loaded */
+static int via686a_attach_adapter(struct i2c_adapter *adapter)
+{
+ return i2c_detect(adapter, &addr_data, via686a_detect);
+}
+
+int via686a_detect(struct i2c_adapter *adapter, int address,
+ unsigned short flags, int kind)
+{
+ int i;
+ struct i2c_client *new_client;
+ struct via686a_data *data;
+ int err = 0;
+ const char *type_name = "via686a";
+ const char client_name[] = "via686a chip";
+ 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-sensor")) {
+ dev_err(&adapter->dev,"region 0x%x already in use!\n",
+ address);
+ return -ENODEV;
+ }
+
+ if (!(new_client = kmalloc(sizeof(struct i2c_client) +
+ sizeof(struct via686a_data),
+ GFP_KERNEL))) {
+ err = -ENOMEM;
+ goto ERROR0;
+ }
+
+ memset(new_client,0x00, sizeof(struct i2c_client) +
+ sizeof(struct via686a_data));
+ data = (struct via686a_data *) (new_client + 1);
+ 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 */
+ snprintf(new_client->dev.name, DEVICE_NAME_SIZE, client_name);
+
+ new_client->id = via686a_id++;
+ 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;
+
+ /* Register a new directory entry with module sensors */
+ if ((i = i2c_register_entry((struct i2c_client *) new_client,
+ type_name,
+ via686a_dir_table_template)) < 0) {
+ err = i;
+ goto ERROR4;
+ }
+ data->sysctl_id = i;
+
+ /* Initialize the VIA686A chip */
+ via686a_init_client(new_client);
+ return 0;
+
+ ERROR4:
+ i2c_detach_client(new_client);
+ ERROR3:
+ release_region(address, VIA686A_EXTENT);
+ kfree(new_client);
+ ERROR0:
+ return err;
+}
+
+static int via686a_detach_client(struct i2c_client *client)
+{
+ int err;
+ struct via686a_data *data = i2c_get_clientdata(client);
+ i2c_deregister_entry(data->sysctl_id);
+
+ 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(client);
+
+ return 0;
+}
+
+/* Called when we have found a new VIA686A. Set limits, etc. */
+static void via686a_init_client(struct i2c_client *client)
+{
+ int i;
+
+ /* Reset the device */
+ via686a_write_value(client, VIA686A_REG_CONFIG, 0x80);
+
+ /* Have to wait for reset to complete or else the following
+ initializations won't work reliably. The delay was arrived at
+ empirically, the datasheet doesn't tell you.
+ Waiting for the reset bit to clear doesn't work, it
+ clears in about 2-4 udelays and that isn't nearly enough. */
+ udelay(50);
+
+ via686a_write_value(client, VIA686A_REG_IN_MIN(0),
+ IN_TO_REG(VIA686A_INIT_IN_MIN_0, 0));
+ via686a_write_value(client, VIA686A_REG_IN_MAX(0),
+ IN_TO_REG(VIA686A_INIT_IN_MAX_0, 0));
+ via686a_write_value(client, VIA686A_REG_IN_MIN(1),
+ IN_TO_REG(VIA686A_INIT_IN_MIN_1, 1));
+ via686a_write_value(client, VIA686A_REG_IN_MAX(1),
+ IN_TO_REG(VIA686A_INIT_IN_MAX_1, 1));
+ via686a_write_value(client, VIA686A_REG_IN_MIN(2),
+ IN_TO_REG(VIA686A_INIT_IN_MIN_2, 2));
+ via686a_write_value(client, VIA686A_REG_IN_MAX(2),
+ IN_TO_REG(VIA686A_INIT_IN_MAX_2, 2));
+ via686a_write_value(client, VIA686A_REG_IN_MIN(3),
+ IN_TO_REG(VIA686A_INIT_IN_MIN_3, 3));
+ via686a_write_value(client, VIA686A_REG_IN_MAX(3),
+ IN_TO_REG(VIA686A_INIT_IN_MAX_3, 3));
+ via686a_write_value(client, VIA686A_REG_IN_MIN(4),
+ IN_TO_REG(VIA686A_INIT_IN_MIN_4, 4));
+ via686a_write_value(client, VIA686A_REG_IN_MAX(4),
+ IN_TO_REG(VIA686A_INIT_IN_MAX_4, 4));
+ via686a_write_value(client, VIA686A_REG_FAN_MIN(1),
+ FAN_TO_REG(VIA686A_INIT_FAN_MIN, 2));
+ via686a_write_value(client, VIA686A_REG_FAN_MIN(2),
+ FAN_TO_REG(VIA686A_INIT_FAN_MIN, 2));
+ for (i = 1; i <= 3; i++) {
+ via686a_write_value(client, VIA686A_REG_TEMP_OVER(i),
+ TEMP_TO_REG(VIA686A_INIT_TEMP_OVER));
+ via686a_write_value(client, VIA686A_REG_TEMP_HYST(i),
+ TEMP_TO_REG(VIA686A_INIT_TEMP_HYST));
+ }
+
+ /* Start monitoring */
+ via686a_write_value(client, VIA686A_REG_CONFIG, 0x01);
+
+ /* Cofigure 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 void via686a_update_client(struct i2c_client *client)
+{
+ struct via686a_data *data = i2c_get_clientdata(client);
+ int i;
+
+ down(&data->update_lock);
+
+ if ((jiffies - data->last_updated > HZ + HZ / 2) ||
+ (jiffies < data->last_updated) || !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 = 1; i <= 3; i++) {
+ data->temp[i - 1] = via686a_read_value(client,
+ VIA686A_REG_TEMP(i)) << 2;
+ data->temp_over[i - 1] =
+ via686a_read_value(client,
+ VIA686A_REG_TEMP_OVER(i));
+ data->temp_hyst[i - 1] =
+ 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);
+}
+
+
+/* The next few functions are the call-back functions of the /proc/sys and
+ sysctl files. Which function is used is defined in the ctl_table in
+ the extra1 field.
+ Each function must return the magnitude (power of 10 to divide the date
+ with) if it is called with operation==SENSORS_PROC_REAL_INFO. It must
+ put a maximum of *nrels elements in results reflecting the data of this
+ file, and set *nrels to the number it actually put in it, if operation==
+ SENSORS_PROC_REAL_READ. Finally, it must get upto *nrels elements from
+ results and write them to the chip, if operations==SENSORS_PROC_REAL_WRITE.
+ Note that on SENSORS_PROC_REAL_READ, I do not check whether results is
+ large enough (by checking the incoming value of *nrels). This is not very
+ good practice, but as long as you put less than about 5 values in results,
+ you can assume it is large enough. */
+static void via686a_in(struct i2c_client *client, int operation, int ctl_name,
+ int *nrels_mag, long *results)
+{
+ struct via686a_data *data = i2c_get_clientdata(client);
+ int nr = ctl_name - VIA686A_SYSCTL_IN0;
+
+ if (operation == SENSORS_PROC_REAL_INFO)
+ *nrels_mag = 2;
+ else if (operation == SENSORS_PROC_REAL_READ) {
+ via686a_update_client(client);
+ results[0] = IN_FROM_REG(data->in_min[nr], nr);
+ results[1] = IN_FROM_REG(data->in_max[nr], nr);
+ results[2] = IN_FROM_REG(data->in[nr], nr);
+ *nrels_mag = 3;
+ } else if (operation == SENSORS_PROC_REAL_WRITE) {
+ if (*nrels_mag >= 1) {
+ data->in_min[nr] = IN_TO_REG(results[0], nr);
+ via686a_write_value(client, VIA686A_REG_IN_MIN(nr),
+ data->in_min[nr]);
+ }
+ if (*nrels_mag >= 2) {
+ data->in_max[nr] = IN_TO_REG(results[1], nr);
+ via686a_write_value(client, VIA686A_REG_IN_MAX(nr),
+ data->in_max[nr]);
+ }
+ }
+}
+
+void via686a_fan(struct i2c_client *client, int operation, int ctl_name,
+ int *nrels_mag, long *results)
+{
+ struct via686a_data *data = i2c_get_clientdata(client);
+ int nr = ctl_name - VIA686A_SYSCTL_FAN1 + 1;
+
+ if (operation == SENSORS_PROC_REAL_INFO)
+ *nrels_mag = 0;
+ else if (operation == SENSORS_PROC_REAL_READ) {
+ via686a_update_client(client);
+ results[0] = FAN_FROM_REG(data->fan_min[nr - 1],
+ DIV_FROM_REG(data->fan_div
+ [nr - 1]));
+ results[1] = FAN_FROM_REG(data->fan[nr - 1],
+ DIV_FROM_REG(data->fan_div[nr - 1]));
+ *nrels_mag = 2;
+ } else if (operation == SENSORS_PROC_REAL_WRITE) {
+ if (*nrels_mag >= 1) {
+ data->fan_min[nr - 1] = FAN_TO_REG(results[0],
+ DIV_FROM_REG(data->
+ fan_div[nr -1]));
+ via686a_write_value(client,
+ VIA686A_REG_FAN_MIN(nr),
+ data->fan_min[nr - 1]);
+ }
+ }
+}
+
+void via686a_temp(struct i2c_client *client, int operation, int ctl_name,
+ int *nrels_mag, long *results)
+{
+ struct via686a_data *data = i2c_get_clientdata(client);
+ int nr = ctl_name - VIA686A_SYSCTL_TEMP;
+
+ if (operation == SENSORS_PROC_REAL_INFO)
+ *nrels_mag = 1;
+ else if (operation == SENSORS_PROC_REAL_READ) {
+ via686a_update_client(client);
+ results[0] = TEMP_FROM_REG(data->temp_over[nr]);
+ results[1] = TEMP_FROM_REG(data->temp_hyst[nr]);
+ results[2] = TEMP_FROM_REG10(data->temp[nr]);
+ *nrels_mag = 3;
+ } else if (operation == SENSORS_PROC_REAL_WRITE) {
+ if (*nrels_mag >= 1) {
+ data->temp_over[nr] = TEMP_TO_REG(results[0]);
+ via686a_write_value(client,
+ VIA686A_REG_TEMP_OVER(nr + 1),
+ data->temp_over[nr]);
+ }
+ if (*nrels_mag >= 2) {
+ data->temp_hyst[nr] = TEMP_TO_REG(results[1]);
+ via686a_write_value(client,
+ VIA686A_REG_TEMP_HYST(nr + 1),
+ data->temp_hyst[nr]);
+ }
+ }
+}
+
+void via686a_alarms(struct i2c_client *client, int operation, int ctl_name,
+ int *nrels_mag, long *results)
+{
+ struct via686a_data *data = i2c_get_clientdata(client);
+ if (operation == SENSORS_PROC_REAL_INFO)
+ *nrels_mag = 0;
+ else if (operation == SENSORS_PROC_REAL_READ) {
+ via686a_update_client(client);
+ results[0] = ALARMS_FROM_REG(data->alarms);
+ *nrels_mag = 1;
+ }
+}
+
+void via686a_fan_div(struct i2c_client *client, int operation,
+ int ctl_name, int *nrels_mag, long *results)
+{
+ struct via686a_data *data = i2c_get_clientdata(client);
+ int old;
+
+ if (operation == SENSORS_PROC_REAL_INFO)
+ *nrels_mag = 0;
+ else if (operation == SENSORS_PROC_REAL_READ) {
+ via686a_update_client(client);
+ results[0] = DIV_FROM_REG(data->fan_div[0]);
+ results[1] = DIV_FROM_REG(data->fan_div[1]);
+ *nrels_mag = 2;
+ } else if (operation == SENSORS_PROC_REAL_WRITE) {
+ old = via686a_read_value(client, VIA686A_REG_FANDIV);
+ if (*nrels_mag >= 2) {
+ data->fan_div[1] = DIV_TO_REG(results[1]);
+ old = (old & 0x3f) | (data->fan_div[1] << 6);
+ }
+ if (*nrels_mag >= 1) {
+ data->fan_div[0] = DIV_TO_REG(results[0]);
+ old = (old & 0xcf) | (data->fan_div[0] << 4);
+ via686a_write_value(client, VIA686A_REG_FANDIV,
+ old);
+ }
+ }
+}
+
+
+static struct pci_device_id via686a_pci_ids[] __devinitdata = {
+ {
+ .vendor = PCI_VENDOR_ID_VIA,
+ .device = PCI_DEVICE_ID_VIA_82C686_4,
+ .subvendor = PCI_ANY_ID,
+ .subdevice = PCI_ANY_ID,
+ .class = 0,
+ .class_mask = 0,
+ .driver_data = 0,
+ },
+ { 0, }
+};
+
+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 = dev;
+ return i2c_add_driver(&via686a_driver);
+}
+
+static void __devexit via686a_pci_remove(struct pci_dev *dev)
+{
+ i2c_del_driver(&via686a_driver);
+}
+
+static struct pci_driver via686a_pci_driver = {
+ .name = "via686a",
+ .id_table = via686a_pci_ids,
+ .probe = via686a_pci_probe,
+ .remove = __devexit_p(via686a_pci_remove),
+};
+
+static int __init sm_via686a_init(void)
+{
+ return pci_module_init(&via686a_pci_driver);
+}
+
+static void __exit sm_via686a_exit(void)
+{
+ pci_unregister_driver(&via686a_pci_driver);
+}
+
+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);