hwmon: driver for Texas Instruments amc6821 chip
Tomaz Mertelj [Fri, 8 Jan 2010 22:43:04 +0000 (14:43 -0800)]
Signed-off-by: <tomaz.mertelj@guest.arnes.si>
Cc: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Documentation/hwmon/amc6821 [new file with mode: 0644]
drivers/hwmon/Kconfig
drivers/hwmon/Makefile
drivers/hwmon/amc6821.c [new file with mode: 0644]

diff --git a/Documentation/hwmon/amc6821 b/Documentation/hwmon/amc6821
new file mode 100644 (file)
index 0000000..ced8359
--- /dev/null
@@ -0,0 +1,102 @@
+Kernel driver amc6821
+=====================
+
+Supported chips:
+       Texas Instruments AMC6821
+       Prefix: 'amc6821'
+       Addresses scanned: 0x18, 0x19, 0x1a, 0x2c, 0x2d, 0x2e, 0x4c, 0x4d, 0x4e
+       Datasheet: http://focus.ti.com/docs/prod/folders/print/amc6821.html
+
+Authors:
+       Tomaz Mertelj <tomaz.mertelj@guest.arnes.si>
+
+
+Description
+-----------
+
+This driver implements support for the Texas Instruments amc6821 chip.
+The chip has one on-chip and one remote temperature sensor and one pwm fan
+regulator.
+The pwm can be controlled either from software or automatically.
+
+The driver provides the following sensor accesses in sysfs:
+
+temp1_input            ro      on-chip temperature
+temp1_min              rw      "
+temp1_max              rw      "
+temp1_crit             rw      "
+temp1_min_alarm                ro      "
+temp1_max_alarm                ro      "
+temp1_crit_alarm       ro      "
+
+temp2_input            ro      remote temperature
+temp2_min              rw      "
+temp2_max              rw      "
+temp2_crit             rw      "
+temp2_min_alarm                ro      "
+temp2_max_alarm                ro      "
+temp2_crit_alarm       ro      "
+temp2_fault            ro      "
+
+fan1_input             ro      tachometer speed
+fan1_min               rw      "
+fan1_max               rw      "
+fan1_fault             ro      "
+fan1_div               rw      Fan divisor can be either 2 or 4.
+
+pwm1                   rw      pwm1
+pwm1_enable            rw      regulator mode, 1=open loop, 2=fan controlled
+                               by remote temperature, 3=fan controlled by
+                               combination of the on-chip temperature and
+                               remote-sensor temperature,
+pwm1_auto_channels_temp ro     1 if pwm_enable==2, 3 if pwm_enable==3
+pwm1_auto_point1_pwm   ro      Hardwired to 0, shared for both
+                               temperature channels.
+pwm1_auto_point2_pwm   rw      This value is shared for both temperature
+                               channels.
+pwm1_auto_point3_pwm   rw      Hardwired to 255, shared for both
+                               temperature channels.
+
+temp1_auto_point1_temp ro      Hardwired to temp2_auto_point1_temp
+                               which is rw. Below this temperature fan stops.
+temp1_auto_point2_temp rw      The low-temperature limit of the proportional
+                               range. Below this temperature
+                               pwm1 = pwm1_auto_point2_pwm. It can go from
+                               0 degree C to 124 degree C in steps of
+                               4 degree C. Read it out after writing to get
+                               the actual value.
+temp1_auto_point3_temp rw      Above this temperature fan runs at maximum
+                               speed. It can go from temp1_auto_point2_temp.
+                               It can only have certain discrete values
+                               which depend on temp1_auto_point2_temp and
+                               pwm1_auto_point2_pwm. Read it out after
+                               writing to get the actual value.
+
+temp2_auto_point1_temp rw      Must be between 0 degree C and 63 degree C and
+                               it defines the passive cooling temperature.
+                               Below this temperature the fan stops in
+                               the closed loop mode.
+temp2_auto_point2_temp rw      The low-temperature limit of the proportional
+                               range. Below this temperature
+                               pwm1 = pwm1_auto_point2_pwm. It can go from
+                               0 degree C to 124 degree C in steps
+                               of 4 degree C.
+
+temp2_auto_point3_temp rw      Above this temperature fan runs at maximum
+                               speed. It can only have certain discrete
+                               values which depend on temp2_auto_point2_temp
+                               and pwm1_auto_point2_pwm. Read it out after
+                               writing to get actual value.
+
+
+Module parameters
+-----------------
+
+If your board has a BIOS that initializes the amc6821 correctly, you should
+load the module with: init=0.
+
+If your board BIOS doesn't initialize the chip, or you want
+different settings, you can set the following parameters:
+init=1,
+pwminv: 0 default pwm output, 1 inverts pwm output.
+
index 46c3c56..07a0f03 100644 (file)
@@ -792,6 +792,16 @@ config SENSORS_ADS7828
          This driver can also be built as a module.  If so, the module
          will be called ads7828.
 
+config SENSORS_AMC6821
+       tristate "Texas Instruments AMC6821"
+       depends on I2C  && EXPERIMENTAL
+       help
+         If you say yes here you get support for the Texas Instruments
+         AMC6821 hardware monitoring chips.
+
+         This driver can also be build as a module.  If so, the module
+         will be called amc6821.
+
 config SENSORS_THMC50
        tristate "Texas Instruments THMC50 / Analog Devices ADM1022"
        depends on I2C && EXPERIMENTAL
index 450c8e8..4bc215c 100644 (file)
@@ -86,6 +86,7 @@ obj-$(CONFIG_SENSORS_SIS5595) += sis5595.o
 obj-$(CONFIG_SENSORS_SMSC47B397)+= smsc47b397.o
 obj-$(CONFIG_SENSORS_SMSC47M1) += smsc47m1.o
 obj-$(CONFIG_SENSORS_SMSC47M192)+= smsc47m192.o
+obj-$(CONFIG_SENSORS_AMC6821)  += amc6821.o
 obj-$(CONFIG_SENSORS_THMC50)   += thmc50.o
 obj-$(CONFIG_SENSORS_TMP401)   += tmp401.o
 obj-$(CONFIG_SENSORS_TMP421)   += tmp421.o
diff --git a/drivers/hwmon/amc6821.c b/drivers/hwmon/amc6821.c
new file mode 100644 (file)
index 0000000..1c89d92
--- /dev/null
@@ -0,0 +1,1116 @@
+/*
+       amc6821.c - Part of lm_sensors, Linux kernel modules for hardware
+       monitoring
+       Copyright (C) 2009 T. Mertelj <tomaz.mertelj@guest.arnes.si>
+
+       Based on max6650.c:
+       Copyright (C) 2007 Hans J. Koch <hjk@linutronix.de>
+
+       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.
+*/
+
+
+#include <linux/kernel.h>      /* Needed for KERN_INFO */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/i2c.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+
+
+/*
+ * Addresses to scan.
+ */
+
+static const unsigned short normal_i2c[] = {0x18, 0x19, 0x1a, 0x2c, 0x2d, 0x2e,
+       0x4c, 0x4d, 0x4e, I2C_CLIENT_END};
+
+
+
+/*
+ * Insmod parameters
+ */
+
+static int pwminv = 0; /*Inverted PWM output. */
+module_param(pwminv, int, S_IRUGO);
+
+static int init = 1; /*Power-on initialization.*/
+module_param(init, int, S_IRUGO);
+
+
+enum chips { amc6821 };
+
+#define AMC6821_REG_DEV_ID 0x3D
+#define AMC6821_REG_COMP_ID 0x3E
+#define AMC6821_REG_CONF1 0x00
+#define AMC6821_REG_CONF2 0x01
+#define AMC6821_REG_CONF3 0x3F
+#define AMC6821_REG_CONF4 0x04
+#define AMC6821_REG_STAT1 0x02
+#define AMC6821_REG_STAT2 0x03
+#define AMC6821_REG_TDATA_LOW 0x08
+#define AMC6821_REG_TDATA_HI 0x09
+#define AMC6821_REG_LTEMP_HI 0x0A
+#define AMC6821_REG_RTEMP_HI 0x0B
+#define AMC6821_REG_LTEMP_LIMIT_MIN 0x15
+#define AMC6821_REG_LTEMP_LIMIT_MAX 0x14
+#define AMC6821_REG_RTEMP_LIMIT_MIN 0x19
+#define AMC6821_REG_RTEMP_LIMIT_MAX 0x18
+#define AMC6821_REG_LTEMP_CRIT 0x1B
+#define AMC6821_REG_RTEMP_CRIT 0x1D
+#define AMC6821_REG_PSV_TEMP 0x1C
+#define AMC6821_REG_DCY 0x22
+#define AMC6821_REG_LTEMP_FAN_CTRL 0x24
+#define AMC6821_REG_RTEMP_FAN_CTRL 0x25
+#define AMC6821_REG_DCY_LOW_TEMP 0x21
+
+#define AMC6821_REG_TACH_LLIMITL 0x10
+#define AMC6821_REG_TACH_LLIMITH 0x11
+#define AMC6821_REG_TACH_HLIMITL 0x12
+#define AMC6821_REG_TACH_HLIMITH 0x13
+
+#define AMC6821_CONF1_START 0x01
+#define AMC6821_CONF1_FAN_INT_EN 0x02
+#define AMC6821_CONF1_FANIE 0x04
+#define AMC6821_CONF1_PWMINV 0x08
+#define AMC6821_CONF1_FAN_FAULT_EN 0x10
+#define AMC6821_CONF1_FDRC0 0x20
+#define AMC6821_CONF1_FDRC1 0x40
+#define AMC6821_CONF1_THERMOVIE 0x80
+
+#define AMC6821_CONF2_PWM_EN 0x01
+#define AMC6821_CONF2_TACH_MODE 0x02
+#define AMC6821_CONF2_TACH_EN 0x04
+#define AMC6821_CONF2_RTFIE 0x08
+#define AMC6821_CONF2_LTOIE 0x10
+#define AMC6821_CONF2_RTOIE 0x20
+#define AMC6821_CONF2_PSVIE 0x40
+#define AMC6821_CONF2_RST 0x80
+
+#define AMC6821_CONF3_THERM_FAN_EN 0x80
+#define AMC6821_CONF3_REV_MASK 0x0F
+
+#define AMC6821_CONF4_OVREN 0x10
+#define AMC6821_CONF4_TACH_FAST 0x20
+#define AMC6821_CONF4_PSPR 0x40
+#define AMC6821_CONF4_MODE 0x80
+
+#define AMC6821_STAT1_RPM_ALARM 0x01
+#define AMC6821_STAT1_FANS 0x02
+#define AMC6821_STAT1_RTH 0x04
+#define AMC6821_STAT1_RTL 0x08
+#define AMC6821_STAT1_R_THERM 0x10
+#define AMC6821_STAT1_RTF 0x20
+#define AMC6821_STAT1_LTH 0x40
+#define AMC6821_STAT1_LTL 0x80
+
+#define AMC6821_STAT2_RTC 0x08
+#define AMC6821_STAT2_LTC 0x10
+#define AMC6821_STAT2_LPSV 0x20
+#define AMC6821_STAT2_L_THERM 0x40
+#define AMC6821_STAT2_THERM_IN 0x80
+
+enum {IDX_TEMP1_INPUT = 0, IDX_TEMP1_MIN, IDX_TEMP1_MAX,
+       IDX_TEMP1_CRIT, IDX_TEMP2_INPUT, IDX_TEMP2_MIN,
+       IDX_TEMP2_MAX, IDX_TEMP2_CRIT,
+       TEMP_IDX_LEN, };
+
+static const u8 temp_reg[] = {AMC6821_REG_LTEMP_HI,
+                       AMC6821_REG_LTEMP_LIMIT_MIN,
+                       AMC6821_REG_LTEMP_LIMIT_MAX,
+                       AMC6821_REG_LTEMP_CRIT,
+                       AMC6821_REG_RTEMP_HI,
+                       AMC6821_REG_RTEMP_LIMIT_MIN,
+                       AMC6821_REG_RTEMP_LIMIT_MAX,
+                       AMC6821_REG_RTEMP_CRIT, };
+
+enum {IDX_FAN1_INPUT = 0, IDX_FAN1_MIN, IDX_FAN1_MAX,
+       FAN1_IDX_LEN, };
+
+static const u8 fan_reg_low[] = {AMC6821_REG_TDATA_LOW,
+                       AMC6821_REG_TACH_LLIMITL,
+                       AMC6821_REG_TACH_HLIMITL, };
+
+
+static const u8 fan_reg_hi[] = {AMC6821_REG_TDATA_HI,
+                       AMC6821_REG_TACH_LLIMITH,
+                       AMC6821_REG_TACH_HLIMITH, };
+
+static int amc6821_probe(
+               struct i2c_client *client,
+               const struct i2c_device_id *id);
+static int amc6821_detect(
+               struct i2c_client *client,
+               struct i2c_board_info *info);
+static int amc6821_init_client(struct i2c_client *client);
+static int amc6821_remove(struct i2c_client *client);
+static struct amc6821_data *amc6821_update_device(struct device *dev);
+
+/*
+ * Driver data (common to all clients)
+ */
+
+static const struct i2c_device_id amc6821_id[] = {
+       { "amc6821", amc6821 },
+       { }
+};
+
+MODULE_DEVICE_TABLE(i2c, amc6821_id);
+
+static struct i2c_driver amc6821_driver = {
+       .class = I2C_CLASS_HWMON,
+       .driver = {
+               .name   = "amc6821",
+       },
+       .probe = amc6821_probe,
+       .remove = amc6821_remove,
+       .id_table = amc6821_id,
+       .detect = amc6821_detect,
+       .address_list = normal_i2c,
+};
+
+
+/*
+ * Client data (each client gets its own)
+  */
+
+struct amc6821_data {
+       struct device *hwmon_dev;
+       struct mutex update_lock;
+       char valid; /* zero until following fields are valid */
+       unsigned long last_updated; /* in jiffies */
+
+       /* register values */
+       int temp[TEMP_IDX_LEN];
+
+       u16 fan[FAN1_IDX_LEN];
+       u8 fan1_div;
+
+       u8 pwm1;
+       u8 temp1_auto_point_temp[3];
+       u8 temp2_auto_point_temp[3];
+       u8 pwm1_auto_point_pwm[3];
+       u8 pwm1_enable;
+       u8 pwm1_auto_channels_temp;
+
+       u8 stat1;
+       u8 stat2;
+};
+
+
+static ssize_t get_temp(
+               struct device *dev,
+               struct device_attribute *devattr,
+               char *buf)
+{
+       struct amc6821_data *data = amc6821_update_device(dev);
+       int ix = to_sensor_dev_attr(devattr)->index;
+
+       return sprintf(buf, "%d\n", data->temp[ix] * 1000);
+}
+
+
+
+static ssize_t set_temp(
+               struct device *dev,
+               struct device_attribute *attr,
+               const char *buf,
+               size_t count)
+{
+       struct i2c_client *client = to_i2c_client(dev);
+       struct amc6821_data *data = i2c_get_clientdata(client);
+       int ix = to_sensor_dev_attr(attr)->index;
+       long val;
+
+       int ret = strict_strtol(buf, 10, &val);
+       if (ret)
+               return ret;
+       val = SENSORS_LIMIT(val / 1000, -128, 127);
+
+       mutex_lock(&data->update_lock);
+       data->temp[ix] = val;
+       if (i2c_smbus_write_byte_data(client, temp_reg[ix], data->temp[ix])) {
+               dev_err(&client->dev, "Register write error, aborting.\n");
+               count = -EIO;
+       }
+       mutex_unlock(&data->update_lock);
+       return count;
+}
+
+
+
+
+static ssize_t get_temp_alarm(
+       struct device *dev,
+       struct device_attribute *devattr,
+       char *buf)
+{
+       struct amc6821_data *data = amc6821_update_device(dev);
+       int ix = to_sensor_dev_attr(devattr)->index;
+       u8 flag;
+
+       switch (ix) {
+       case IDX_TEMP1_MIN:
+               flag = data->stat1 & AMC6821_STAT1_LTL;
+               break;
+       case IDX_TEMP1_MAX:
+               flag = data->stat1 & AMC6821_STAT1_LTH;
+               break;
+       case IDX_TEMP1_CRIT:
+               flag = data->stat2 & AMC6821_STAT2_LTC;
+               break;
+       case IDX_TEMP2_MIN:
+               flag = data->stat1 & AMC6821_STAT1_RTL;
+               break;
+       case IDX_TEMP2_MAX:
+               flag = data->stat1 & AMC6821_STAT1_RTH;
+               break;
+       case IDX_TEMP2_CRIT:
+               flag = data->stat2 & AMC6821_STAT2_RTC;
+               break;
+       default:
+               dev_dbg(dev, "Unknown attr->index (%d).\n", ix);
+               return -EINVAL;
+       }
+       if (flag)
+               return sprintf(buf, "1");
+       else
+               return sprintf(buf, "0");
+}
+
+
+
+
+static ssize_t get_temp2_fault(
+               struct device *dev,
+               struct device_attribute *devattr,
+               char *buf)
+{
+       struct amc6821_data *data = amc6821_update_device(dev);
+       if (data->stat1 & AMC6821_STAT1_RTF)
+               return sprintf(buf, "1");
+       else
+               return sprintf(buf, "0");
+}
+
+static ssize_t get_pwm1(
+               struct device *dev,
+               struct device_attribute *devattr,
+               char *buf)
+{
+       struct amc6821_data *data = amc6821_update_device(dev);
+       return sprintf(buf, "%d\n", data->pwm1);
+}
+
+static ssize_t set_pwm1(
+               struct device *dev,
+               struct device_attribute *devattr,
+               const char *buf,
+               size_t count)
+{
+       struct i2c_client *client = to_i2c_client(dev);
+       struct amc6821_data *data = i2c_get_clientdata(client);
+       long val;
+       int ret = strict_strtol(buf, 10, &val);
+       if (ret)
+               return ret;
+
+       mutex_lock(&data->update_lock);
+       data->pwm1 = SENSORS_LIMIT(val , 0, 255);
+       i2c_smbus_write_byte_data(client, AMC6821_REG_DCY, data->pwm1);
+       mutex_unlock(&data->update_lock);
+       return count;
+}
+
+static ssize_t get_pwm1_enable(
+               struct device *dev,
+               struct device_attribute *devattr,
+               char *buf)
+{
+       struct amc6821_data *data = amc6821_update_device(dev);
+       return sprintf(buf, "%d\n", data->pwm1_enable);
+}
+
+static ssize_t set_pwm1_enable(
+               struct device *dev,
+               struct device_attribute *attr,
+               const char *buf,
+               size_t count)
+{
+       struct i2c_client *client = to_i2c_client(dev);
+       struct amc6821_data *data = i2c_get_clientdata(client);
+       long val;
+       int config = strict_strtol(buf, 10, &val);
+       if (config)
+               return config;
+
+       config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
+       if (config < 0) {
+                       dev_err(&client->dev,
+                       "Error reading configuration register, aborting.\n");
+                       return -EIO;
+       }
+
+       switch (val) {
+       case 1:
+               config &= ~AMC6821_CONF1_FDRC0;
+               config &= ~AMC6821_CONF1_FDRC1;
+               break;
+       case 2:
+               config &= ~AMC6821_CONF1_FDRC0;
+               config |= AMC6821_CONF1_FDRC1;
+               break;
+       case 3:
+               config |= AMC6821_CONF1_FDRC0;
+               config |= AMC6821_CONF1_FDRC1;
+               break;
+       default:
+               return -EINVAL;
+       }
+       mutex_lock(&data->update_lock);
+       if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF1, config)) {
+                       dev_err(&client->dev,
+                       "Configuration register write error, aborting.\n");
+                       count = -EIO;
+       }
+       mutex_unlock(&data->update_lock);
+       return count;
+}
+
+
+static ssize_t get_pwm1_auto_channels_temp(
+               struct device *dev,
+               struct device_attribute *devattr,
+               char *buf)
+{
+       struct amc6821_data *data = amc6821_update_device(dev);
+       return sprintf(buf, "%d\n", data->pwm1_auto_channels_temp);
+}
+
+
+static ssize_t get_temp_auto_point_temp(
+               struct device *dev,
+               struct device_attribute *devattr,
+               char *buf)
+{
+       int ix = to_sensor_dev_attr_2(devattr)->index;
+       int nr = to_sensor_dev_attr_2(devattr)->nr;
+       struct amc6821_data *data = amc6821_update_device(dev);
+       switch (nr) {
+       case 1:
+               return sprintf(buf, "%d\n",
+                       data->temp1_auto_point_temp[ix] * 1000);
+               break;
+       case 2:
+               return sprintf(buf, "%d\n",
+                       data->temp2_auto_point_temp[ix] * 1000);
+               break;
+       default:
+               dev_dbg(dev, "Unknown attr->nr (%d).\n", nr);
+               return -EINVAL;
+       }
+}
+
+
+static ssize_t get_pwm1_auto_point_pwm(
+               struct device *dev,
+               struct device_attribute *devattr,
+               char *buf)
+{
+       int ix = to_sensor_dev_attr(devattr)->index;
+       struct amc6821_data *data = amc6821_update_device(dev);
+       return sprintf(buf, "%d\n", data->pwm1_auto_point_pwm[ix]);
+}
+
+
+static inline ssize_t set_slope_register(struct i2c_client *client,
+               u8 reg,
+               u8 dpwm,
+               u8 *ptemp)
+{
+       int dt;
+       u8 tmp;
+
+       dt = ptemp[2]-ptemp[1];
+       for (tmp = 4; tmp > 0; tmp--) {
+               if (dt * (0x20 >> tmp) >= dpwm)
+                       break;
+       }
+       tmp |= (ptemp[1] & 0x7C) << 1;
+       if (i2c_smbus_write_byte_data(client,
+                       reg, tmp)) {
+               dev_err(&client->dev, "Register write error, aborting.\n");
+               return -EIO;
+       }
+       return 0;
+}
+
+
+
+static ssize_t set_temp_auto_point_temp(
+               struct device *dev,
+               struct device_attribute *attr,
+               const char *buf,
+               size_t count)
+{
+       struct i2c_client *client = to_i2c_client(dev);
+       struct amc6821_data *data = amc6821_update_device(dev);
+       int ix = to_sensor_dev_attr_2(attr)->index;
+       int nr = to_sensor_dev_attr_2(attr)->nr;
+       u8 *ptemp;
+       u8 reg;
+       int dpwm;
+       long val;
+       int ret = strict_strtol(buf, 10, &val);
+       if (ret)
+               return ret;
+
+       switch (nr) {
+       case 1:
+               ptemp = data->temp1_auto_point_temp;
+               reg = AMC6821_REG_LTEMP_FAN_CTRL;
+               break;
+       case 2:
+               ptemp = data->temp2_auto_point_temp;
+               reg = AMC6821_REG_RTEMP_FAN_CTRL;
+               break;
+       default:
+               dev_dbg(dev, "Unknown attr->nr (%d).\n", nr);
+               return -EINVAL;
+       }
+
+       data->valid = 0;
+       mutex_lock(&data->update_lock);
+       switch (ix) {
+       case 0:
+               ptemp[0] = SENSORS_LIMIT(val / 1000, 0,
+                               data->temp1_auto_point_temp[1]);
+               ptemp[0] = SENSORS_LIMIT(ptemp[0], 0,
+                               data->temp2_auto_point_temp[1]);
+               ptemp[0] = SENSORS_LIMIT(ptemp[0], 0, 63);
+               if (i2c_smbus_write_byte_data(
+                                       client,
+                                       AMC6821_REG_PSV_TEMP,
+                                       ptemp[0])) {
+                               dev_err(&client->dev,
+                                       "Register write error, aborting.\n");
+                               count = -EIO;
+               }
+               goto EXIT;
+               break;
+       case 1:
+               ptemp[1] = SENSORS_LIMIT(
+                                       val / 1000,
+                                       (ptemp[0] & 0x7C) + 4,
+                                       124);
+               ptemp[1] &= 0x7C;
+               ptemp[2] = SENSORS_LIMIT(
+                                       ptemp[2], ptemp[1] + 1,
+                                       255);
+               break;
+       case 2:
+               ptemp[2] = SENSORS_LIMIT(
+                                       val / 1000,
+                                       ptemp[1]+1,
+                                       255);
+               break;
+       default:
+               dev_dbg(dev, "Unknown attr->index (%d).\n", ix);
+               count = -EINVAL;
+               goto EXIT;
+       }
+       dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
+       if (set_slope_register(client, reg, dpwm, ptemp))
+               count = -EIO;
+
+EXIT:
+       mutex_unlock(&data->update_lock);
+       return count;
+}
+
+
+
+static ssize_t set_pwm1_auto_point_pwm(
+               struct device *dev,
+               struct device_attribute *attr,
+               const char *buf,
+               size_t count)
+{
+       struct i2c_client *client = to_i2c_client(dev);
+       struct amc6821_data *data = i2c_get_clientdata(client);
+       int dpwm;
+       long val;
+       int ret = strict_strtol(buf, 10, &val);
+       if (ret)
+               return ret;
+
+       mutex_lock(&data->update_lock);
+       data->pwm1_auto_point_pwm[1] = SENSORS_LIMIT(val, 0, 254);
+       if (i2c_smbus_write_byte_data(client, AMC6821_REG_DCY_LOW_TEMP,
+                       data->pwm1_auto_point_pwm[1])) {
+               dev_err(&client->dev, "Register write error, aborting.\n");
+               count = -EIO;
+               goto EXIT;
+       }
+       dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
+       if (set_slope_register(client, AMC6821_REG_LTEMP_FAN_CTRL, dpwm,
+                       data->temp1_auto_point_temp)) {
+               count = -EIO;
+               goto EXIT;
+       }
+       if (set_slope_register(client, AMC6821_REG_RTEMP_FAN_CTRL, dpwm,
+                       data->temp2_auto_point_temp)) {
+               count = -EIO;
+               goto EXIT;
+       }
+
+EXIT:
+       data->valid = 0;
+       mutex_unlock(&data->update_lock);
+       return count;
+}
+
+static ssize_t get_fan(
+               struct device *dev,
+               struct device_attribute *devattr,
+               char *buf)
+{
+       struct amc6821_data *data = amc6821_update_device(dev);
+       int ix = to_sensor_dev_attr(devattr)->index;
+       if (0 == data->fan[ix])
+               return sprintf(buf, "0");
+       return sprintf(buf, "%d\n", (int)(6000000 / data->fan[ix]));
+}
+
+
+
+static ssize_t get_fan1_fault(
+               struct device *dev,
+               struct device_attribute *devattr,
+               char *buf)
+{
+       struct amc6821_data *data = amc6821_update_device(dev);
+       if (data->stat1 & AMC6821_STAT1_FANS)
+               return sprintf(buf, "1");
+       else
+               return sprintf(buf, "0");
+}
+
+
+
+static ssize_t set_fan(
+               struct device *dev,
+               struct device_attribute *attr,
+               const char *buf, size_t count)
+{
+       struct i2c_client *client = to_i2c_client(dev);
+       struct amc6821_data *data = i2c_get_clientdata(client);
+       long val;
+       int ix = to_sensor_dev_attr(attr)->index;
+       int ret = strict_strtol(buf, 10, &val);
+       if (ret)
+               return ret;
+       val = 1 > val ? 0xFFFF : 6000000/val;
+
+       mutex_lock(&data->update_lock);
+       data->fan[ix] = (u16) SENSORS_LIMIT(val, 1, 0xFFFF);
+       if (i2c_smbus_write_byte_data(client, fan_reg_low[ix],
+                       data->fan[ix] & 0xFF)) {
+               dev_err(&client->dev, "Register write error, aborting.\n");
+               count = -EIO;
+               goto EXIT;
+       }
+       if (i2c_smbus_write_byte_data(client,
+                       fan_reg_hi[ix], data->fan[ix] >> 8)) {
+               dev_err(&client->dev, "Register write error, aborting.\n");
+               count = -EIO;
+       }
+EXIT:
+       mutex_unlock(&data->update_lock);
+       return count;
+}
+
+
+
+static ssize_t get_fan1_div(
+               struct device *dev,
+               struct device_attribute *devattr,
+               char *buf)
+{
+       struct amc6821_data *data = amc6821_update_device(dev);
+       return sprintf(buf, "%d\n", data->fan1_div);
+}
+
+static ssize_t set_fan1_div(
+               struct device *dev,
+               struct device_attribute *attr,
+               const char *buf, size_t count)
+{
+       struct i2c_client *client = to_i2c_client(dev);
+       struct amc6821_data *data = i2c_get_clientdata(client);
+       long val;
+       int config = strict_strtol(buf, 10, &val);
+       if (config)
+               return config;
+
+       config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
+       if (config < 0) {
+               dev_err(&client->dev,
+                       "Error reading configuration register, aborting.\n");
+               return -EIO;
+       }
+       mutex_lock(&data->update_lock);
+       switch (val) {
+       case 2:
+               config &= ~AMC6821_CONF4_PSPR;
+               data->fan1_div = 2;
+               break;
+       case 4:
+               config |= AMC6821_CONF4_PSPR;
+               data->fan1_div = 4;
+               break;
+       default:
+               mutex_unlock(&data->update_lock);
+               count = -EINVAL;
+               goto EXIT;
+       }
+       if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4, config)) {
+               dev_err(&client->dev,
+                       "Configuration register write error, aborting.\n");
+               count = -EIO;
+       }
+EXIT:
+       mutex_unlock(&data->update_lock);
+       return count;
+}
+
+
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
+       get_temp, NULL, IDX_TEMP1_INPUT);
+static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR, get_temp,
+       set_temp, IDX_TEMP1_MIN);
+static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, get_temp,
+       set_temp, IDX_TEMP1_MAX);
+static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR, get_temp,
+       set_temp, IDX_TEMP1_CRIT);
+static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO,
+       get_temp_alarm, NULL, IDX_TEMP1_MIN);
+static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO,
+       get_temp_alarm, NULL, IDX_TEMP1_MAX);
+static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO,
+       get_temp_alarm, NULL, IDX_TEMP1_CRIT);
+static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO | S_IWUSR,
+       get_temp, NULL, IDX_TEMP2_INPUT);
+static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR, get_temp,
+       set_temp, IDX_TEMP2_MIN);
+static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR, get_temp,
+       set_temp, IDX_TEMP2_MAX);
+static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO | S_IWUSR, get_temp,
+       set_temp, IDX_TEMP2_CRIT);
+static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO,
+       get_temp2_fault, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO,
+       get_temp_alarm, NULL, IDX_TEMP2_MIN);
+static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO,
+       get_temp_alarm, NULL, IDX_TEMP2_MAX);
+static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO,
+       get_temp_alarm, NULL, IDX_TEMP2_CRIT);
+static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, IDX_FAN1_INPUT);
+static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO | S_IWUSR,
+       get_fan, set_fan, IDX_FAN1_MIN);
+static SENSOR_DEVICE_ATTR(fan1_max, S_IRUGO | S_IWUSR,
+       get_fan, set_fan, IDX_FAN1_MAX);
+static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, get_fan1_fault, NULL, 0);
+static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
+       get_fan1_div, set_fan1_div, 0);
+
+static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm1, set_pwm1, 0);
+static SENSOR_DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO,
+       get_pwm1_enable, set_pwm1_enable, 0);
+static SENSOR_DEVICE_ATTR(pwm1_auto_point1_pwm, S_IRUGO,
+       get_pwm1_auto_point_pwm, NULL, 0);
+static SENSOR_DEVICE_ATTR(pwm1_auto_point2_pwm, S_IWUSR | S_IRUGO,
+       get_pwm1_auto_point_pwm, set_pwm1_auto_point_pwm, 1);
+static SENSOR_DEVICE_ATTR(pwm1_auto_point3_pwm, S_IRUGO,
+       get_pwm1_auto_point_pwm, NULL, 2);
+static SENSOR_DEVICE_ATTR(pwm1_auto_channels_temp, S_IRUGO,
+       get_pwm1_auto_channels_temp, NULL, 0);
+static SENSOR_DEVICE_ATTR_2(temp1_auto_point1_temp, S_IRUGO,
+       get_temp_auto_point_temp, NULL, 1, 0);
+static SENSOR_DEVICE_ATTR_2(temp1_auto_point2_temp, S_IWUSR | S_IRUGO,
+       get_temp_auto_point_temp, set_temp_auto_point_temp, 1, 1);
+static SENSOR_DEVICE_ATTR_2(temp1_auto_point3_temp, S_IWUSR | S_IRUGO,
+       get_temp_auto_point_temp, set_temp_auto_point_temp, 1, 2);
+
+static SENSOR_DEVICE_ATTR_2(temp2_auto_point1_temp, S_IWUSR | S_IRUGO,
+       get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 0);
+static SENSOR_DEVICE_ATTR_2(temp2_auto_point2_temp, S_IWUSR | S_IRUGO,
+       get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 1);
+static SENSOR_DEVICE_ATTR_2(temp2_auto_point3_temp, S_IWUSR | S_IRUGO,
+       get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 2);
+
+
+
+static struct attribute *amc6821_attrs[] = {
+       &sensor_dev_attr_temp1_input.dev_attr.attr,
+       &sensor_dev_attr_temp1_min.dev_attr.attr,
+       &sensor_dev_attr_temp1_max.dev_attr.attr,
+       &sensor_dev_attr_temp1_crit.dev_attr.attr,
+       &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
+       &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
+       &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
+       &sensor_dev_attr_temp2_input.dev_attr.attr,
+       &sensor_dev_attr_temp2_min.dev_attr.attr,
+       &sensor_dev_attr_temp2_max.dev_attr.attr,
+       &sensor_dev_attr_temp2_crit.dev_attr.attr,
+       &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
+       &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
+       &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
+       &sensor_dev_attr_temp2_fault.dev_attr.attr,
+       &sensor_dev_attr_fan1_input.dev_attr.attr,
+       &sensor_dev_attr_fan1_min.dev_attr.attr,
+       &sensor_dev_attr_fan1_max.dev_attr.attr,
+       &sensor_dev_attr_fan1_fault.dev_attr.attr,
+       &sensor_dev_attr_fan1_div.dev_attr.attr,
+       &sensor_dev_attr_pwm1.dev_attr.attr,
+       &sensor_dev_attr_pwm1_enable.dev_attr.attr,
+       &sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr,
+       &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
+       &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
+       &sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
+       &sensor_dev_attr_temp1_auto_point1_temp.dev_attr.attr,
+       &sensor_dev_attr_temp1_auto_point2_temp.dev_attr.attr,
+       &sensor_dev_attr_temp1_auto_point3_temp.dev_attr.attr,
+       &sensor_dev_attr_temp2_auto_point1_temp.dev_attr.attr,
+       &sensor_dev_attr_temp2_auto_point2_temp.dev_attr.attr,
+       &sensor_dev_attr_temp2_auto_point3_temp.dev_attr.attr,
+       NULL
+};
+
+static struct attribute_group amc6821_attr_grp = {
+       .attrs = amc6821_attrs,
+};
+
+
+
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int amc6821_detect(
+               struct i2c_client *client,
+               struct i2c_board_info *info)
+{
+       struct i2c_adapter *adapter = client->adapter;
+       int address = client->addr;
+       int dev_id, comp_id;
+
+       dev_dbg(&adapter->dev, "amc6821_detect called.\n");
+
+       if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
+               dev_dbg(&adapter->dev,
+                       "amc6821: I2C bus doesn't support byte mode, "
+                       "skipping.\n");
+               return -ENODEV;
+       }
+
+       dev_id = i2c_smbus_read_byte_data(client, AMC6821_REG_DEV_ID);
+       comp_id = i2c_smbus_read_byte_data(client, AMC6821_REG_COMP_ID);
+       if (dev_id != 0x21 || comp_id != 0x49) {
+               dev_dbg(&adapter->dev,
+                       "amc6821: detection failed at 0x%02x.\n",
+                       address);
+               return -ENODEV;
+       }
+
+       /* Bit 7 of the address register is ignored, so we can check the
+          ID registers again */
+       dev_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_DEV_ID);
+       comp_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_COMP_ID);
+       if (dev_id != 0x21 || comp_id != 0x49) {
+               dev_dbg(&adapter->dev,
+                       "amc6821: detection failed at 0x%02x.\n",
+                       address);
+               return -ENODEV;
+       }
+
+       dev_info(&adapter->dev, "amc6821: chip found at 0x%02x.\n", address);
+       strlcpy(info->type, "amc6821", I2C_NAME_SIZE);
+
+       return 0;
+}
+
+static int amc6821_probe(
+       struct i2c_client *client,
+       const struct i2c_device_id *id)
+{
+       struct amc6821_data *data;
+       int err;
+
+       data = kzalloc(sizeof(struct amc6821_data), GFP_KERNEL);
+       if (!data) {
+               dev_err(&client->dev, "out of memory.\n");
+               return -ENOMEM;
+       }
+
+
+       i2c_set_clientdata(client, data);
+       mutex_init(&data->update_lock);
+
+       /*
+        * Initialize the amc6821 chip
+        */
+       err = amc6821_init_client(client);
+       if (err)
+               goto err_free;
+
+       err = sysfs_create_group(&client->dev.kobj, &amc6821_attr_grp);
+       if (err)
+               goto err_free;
+
+       data->hwmon_dev = hwmon_device_register(&client->dev);
+       if (!IS_ERR(data->hwmon_dev))
+               return 0;
+
+       err = PTR_ERR(data->hwmon_dev);
+       dev_err(&client->dev, "error registering hwmon device.\n");
+       sysfs_remove_group(&client->dev.kobj, &amc6821_attr_grp);
+err_free:
+       kfree(data);
+       return err;
+}
+
+static int amc6821_remove(struct i2c_client *client)
+{
+       struct amc6821_data *data = i2c_get_clientdata(client);
+
+       hwmon_device_unregister(data->hwmon_dev);
+       sysfs_remove_group(&client->dev.kobj, &amc6821_attr_grp);
+
+       kfree(data);
+
+       return 0;
+}
+
+
+static int amc6821_init_client(struct i2c_client *client)
+{
+       int config;
+       int err = -EIO;
+
+       if (init) {
+               config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
+
+               if (config < 0) {
+                               dev_err(&client->dev,
+                       "Error reading configuration register, aborting.\n");
+                               return err;
+               }
+
+               config |= AMC6821_CONF4_MODE;
+
+               if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4,
+                               config)) {
+                       dev_err(&client->dev,
+                       "Configuration register write error, aborting.\n");
+                       return err;
+               }
+
+               config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF3);
+
+               if (config < 0) {
+                       dev_err(&client->dev,
+                       "Error reading configuration register, aborting.\n");
+                       return err;
+               }
+
+               dev_info(&client->dev, "Revision %d\n", config & 0x0f);
+
+               config &= ~AMC6821_CONF3_THERM_FAN_EN;
+
+               if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF3,
+                               config)) {
+                       dev_err(&client->dev,
+                       "Configuration register write error, aborting.\n");
+                       return err;
+               }
+
+               config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF2);
+
+               if (config < 0) {
+                       dev_err(&client->dev,
+                       "Error reading configuration register, aborting.\n");
+                       return err;
+               }
+
+               config &= ~AMC6821_CONF2_RTFIE;
+               config &= ~AMC6821_CONF2_LTOIE;
+               config &= ~AMC6821_CONF2_RTOIE;
+               if (i2c_smbus_write_byte_data(client,
+                               AMC6821_REG_CONF2, config)) {
+                       dev_err(&client->dev,
+                       "Configuration register write error, aborting.\n");
+                       return err;
+               }
+
+               config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
+
+               if (config < 0) {
+                       dev_err(&client->dev,
+                       "Error reading configuration register, aborting.\n");
+                       return err;
+               }
+
+               config &= ~AMC6821_CONF1_THERMOVIE;
+               config &= ~AMC6821_CONF1_FANIE;
+               config |= AMC6821_CONF1_START;
+               if (pwminv)
+                       config |= AMC6821_CONF1_PWMINV;
+               else
+                       config &= ~AMC6821_CONF1_PWMINV;
+
+               if (i2c_smbus_write_byte_data(
+                               client, AMC6821_REG_CONF1, config)) {
+                       dev_err(&client->dev,
+                       "Configuration register write error, aborting.\n");
+                       return err;
+               }
+       }
+       return 0;
+}
+
+
+static struct amc6821_data *amc6821_update_device(struct device *dev)
+{
+       struct i2c_client *client = to_i2c_client(dev);
+       struct amc6821_data *data = i2c_get_clientdata(client);
+       int timeout = HZ;
+       u8 reg;
+       int i;
+
+       mutex_lock(&data->update_lock);
+
+       if (time_after(jiffies, data->last_updated + timeout) ||
+                       !data->valid) {
+
+               for (i = 0; i < TEMP_IDX_LEN; i++)
+                       data->temp[i] = i2c_smbus_read_byte_data(client,
+                               temp_reg[i]);
+
+               data->stat1 = i2c_smbus_read_byte_data(client,
+                       AMC6821_REG_STAT1);
+               data->stat2 = i2c_smbus_read_byte_data(client,
+                       AMC6821_REG_STAT2);
+
+               data->pwm1 = i2c_smbus_read_byte_data(client,
+                       AMC6821_REG_DCY);
+               for (i = 0; i < FAN1_IDX_LEN; i++) {
+                       data->fan[i] = i2c_smbus_read_byte_data(
+                                       client,
+                                       fan_reg_low[i]);
+                       data->fan[i] += i2c_smbus_read_byte_data(
+                                       client,
+                                       fan_reg_hi[i]) << 8;
+               }
+               data->fan1_div = i2c_smbus_read_byte_data(client,
+                       AMC6821_REG_CONF4);
+               data->fan1_div = data->fan1_div & AMC6821_CONF4_PSPR ? 4 : 2;
+
+               data->pwm1_auto_point_pwm[0] = 0;
+               data->pwm1_auto_point_pwm[2] = 255;
+               data->pwm1_auto_point_pwm[1] = i2c_smbus_read_byte_data(client,
+                       AMC6821_REG_DCY_LOW_TEMP);
+
+               data->temp1_auto_point_temp[0] =
+                       i2c_smbus_read_byte_data(client,
+                                       AMC6821_REG_PSV_TEMP);
+               data->temp2_auto_point_temp[0] =
+                               data->temp1_auto_point_temp[0];
+               reg = i2c_smbus_read_byte_data(client,
+                       AMC6821_REG_LTEMP_FAN_CTRL);
+               data->temp1_auto_point_temp[1] = (reg & 0xF8) >> 1;
+               reg &= 0x07;
+               reg = 0x20 >> reg;
+               if (reg > 0)
+                       data->temp1_auto_point_temp[2] =
+                               data->temp1_auto_point_temp[1] +
+                               (data->pwm1_auto_point_pwm[2] -
+                               data->pwm1_auto_point_pwm[1]) / reg;
+               else
+                       data->temp1_auto_point_temp[2] = 255;
+
+               reg = i2c_smbus_read_byte_data(client,
+                       AMC6821_REG_RTEMP_FAN_CTRL);
+               data->temp2_auto_point_temp[1] = (reg & 0xF8) >> 1;
+               reg &= 0x07;
+               reg = 0x20 >> reg;
+               if (reg > 0)
+                       data->temp2_auto_point_temp[2] =
+                               data->temp2_auto_point_temp[1] +
+                               (data->pwm1_auto_point_pwm[2] -
+                               data->pwm1_auto_point_pwm[1]) / reg;
+               else
+                       data->temp2_auto_point_temp[2] = 255;
+
+               reg = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
+               reg = (reg >> 5) & 0x3;
+               switch (reg) {
+               case 0: /*open loop: software sets pwm1*/
+                       data->pwm1_auto_channels_temp = 0;
+                       data->pwm1_enable = 1;
+                       break;
+               case 2: /*closed loop: remote T (temp2)*/
+                       data->pwm1_auto_channels_temp = 2;
+                       data->pwm1_enable = 2;
+                       break;
+               case 3: /*closed loop: local and remote T (temp2)*/
+                       data->pwm1_auto_channels_temp = 3;
+                       data->pwm1_enable = 3;
+                       break;
+               case 1: /*semi-open loop: software sets rpm, chip controls pwm1,
+                         *currently not implemented
+                         */
+                       data->pwm1_auto_channels_temp = 0;
+                       data->pwm1_enable = 0;
+                       break;
+               }
+
+               data->last_updated = jiffies;
+               data->valid = 1;
+       }
+       mutex_unlock(&data->update_lock);
+       return data;
+}
+
+
+static int __init amc6821_init(void)
+{
+       return i2c_add_driver(&amc6821_driver);
+}
+
+static void __exit amc6821_exit(void)
+{
+       i2c_del_driver(&amc6821_driver);
+}
+
+module_init(amc6821_init);
+module_exit(amc6821_exit);
+
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("T. Mertelj <tomaz.mertelj@guest.arnes.si>");
+MODULE_DESCRIPTION("Texas Instruments amc6821 hwmon driver");