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Message-ID: <20090905_120834_010267.tomaz.mertelj@guest.arnes.si>
Date: Sat, 5 Sep 2009 14:08:34 +0200
From: tomaz.mertelj@...st.arnes.si
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: lm-sensors@...sensors.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hwmon: Driver for Texas Instruments amc6821 chip
>- The attachment uses \r\n line termination and caused me quite a bit
> of trouble before I worked out what was going on.
I am sorry. All my e-mail access is from MS-windows and I can not figure
how to get rid of \r\n. For convenience I attach also the raw patch with \n
only in encoded format.
>- The changelog is missing your Signed-off-by:. Please read up on
> this in Documentation/SubmittingPatches.
Fixed.
>- The driver needs lots and lots of trivial coding-style fixes.
> Please take a look at some similar drivers and also use the
> scripts/checkpatch.pl tool.
Fixed.
I also added documentation file and fixed bugs related to setting the trip
points.
Best Regards,
Tomaz
--
Signed-off-by: tomaz.mertelj@...st.arnes.si
diff --git a/Documentation/hwmon/amc6821 b/Documentation/hwmon/
amc6821
new file mode 100644
index 0000000..b7cba86
--- /dev/null
+++ b/Documentation/hwmon/amc6821
@@ -0,0 +1,101 @@
+Kernel driver amc6821
+=====================
+
+Supported chips:
+ 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@...st.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 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, 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 and 124 degree C in steps of
+ 4 degree C. Read it out after writing to
get
+ 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 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 and 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.
+
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 2d50166..dbe180f 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -777,6 +777,16 @@ 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
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index b793dce..431de76 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -81,6 +81,7 @@ 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_VIA686A) += via686a.o
diff --git a/drivers/hwmon/amc6821.c b/drivers/hwmon/amc6821.c
new file mode 100644
index 0000000..6905c5e
--- /dev/null
+++ b/drivers/hwmon/amc6821.c
@@ -0,0 +1,1037 @@
+/*
+ amc6821.c - Part of lm_sensors, Linux kernel modules for
hardware
+ monitoring
+ Copyright (C) 2009 T. Mertelj <tomaz.mertelj@...st.arnes.si>
+
+ 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);
+
+
+I2C_CLIENT_INSMOD_1(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
+
+
+static int amc6821_probe(
+ struct i2c_client *client,
+ const struct i2c_device_id *id);
+static int amc6821_detect(
+ struct i2c_client *client,
+ int kind,
+ 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_data = &addr_data,
+};
+
+
+/*
+ * 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 temp1_input;
+ int temp1_min;
+ int temp1_max;
+ int temp1_crit;
+
+ int temp2_input;
+ int temp2_min;
+ int temp2_max;
+ int temp2_crit;
+
+ u16 fan1_input;
+ u16 fan1_min;
+ u16 fan1_max;
+ 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;
+};
+
+
+#define get_temp_para(name) \
+static ssize_t get_##name(\
+ struct device *dev,\
+ struct device_attribute *devattr,\
+ char *buf)\
+{\
+ struct amc6821_data *data = amc6821_update_device(dev);\
+ return sprintf(buf, "%d\n", data->name * 1000);\
+}
+
+get_temp_para(temp1_input);
+get_temp_para(temp1_min);
+get_temp_para(temp1_max);
+get_temp_para(temp2_input);
+get_temp_para(temp2_min);
+get_temp_para(temp2_max);
+get_temp_para(temp1_crit);
+get_temp_para(temp2_crit);
+
+#define set_temp_para(name, reg)\
+static ssize_t set_##name(\
+ 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 val = simple_strtol(buf, NULL, 10); \
+ \
+ mutex_lock(&data->update_lock); \
+ data->name = SENSORS_LIMIT(val / 1000, -128, 127); \
+ if (i2c_smbus_write_byte_data(client, reg, data->name)) {\
+ dev_err(&client->dev, "Register write error, aborting.\n");\
+ count = -EIO;\
+ } \
+ mutex_unlock(&data->update_lock); \
+ return count; \
+}
+
+set_temp_para(temp1_min, AMC6821_REG_LTEMP_LIMIT_MIN);
+set_temp_para(temp1_max, AMC6821_REG_LTEMP_LIMIT_MAX);
+set_temp_para(temp2_min, AMC6821_REG_RTEMP_LIMIT_MIN);
+set_temp_para(temp2_max, AMC6821_REG_RTEMP_LIMIT_MAX);
+set_temp_para(temp1_crit, AMC6821_REG_LTEMP_CRIT);
+set_temp_para(temp2_crit, AMC6821_REG_RTEMP_CRIT);
+
+#define get_temp_alarm(name, reg, mask)\
+static ssize_t get_##name(\
+ struct device *dev, \
+ struct device_attribute *devattr,\
+ char *buf)\
+{\
+ struct amc6821_data *data = amc6821_update_device(dev);\
+ if (data->reg & mask)\
+ return sprintf(buf, "1");\
+ else \
+ return sprintf(buf, "0");\
+} \
+
+get_temp_alarm(temp1_min_alarm, stat1, AMC6821_STAT1_LTL)
+get_temp_alarm(temp1_max_alarm, stat1, AMC6821_STAT1_LTH)
+get_temp_alarm(temp2_min_alarm, stat1, AMC6821_STAT1_RTL)
+get_temp_alarm(temp2_max_alarm, stat1, AMC6821_STAT1_RTH)
+get_temp_alarm(temp1_crit_alarm, stat2, AMC6821_STAT2_LTC)
+get_temp_alarm(temp2_crit_alarm, stat2, AMC6821_STAT2_RTC)
+
+
+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);
+ int val = simple_strtol(buf, NULL, 10);
+
+ 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);
+ int val = simple_strtol(buf, NULL, 10);
+
+ int 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);
+}
+
+
+#define get_auto_point(name)\
+static ssize_t get_##name(\
+ struct device *dev,\
+ struct device_attribute *devattr,\
+ char *buf)\
+{\
+ int nr = to_sensor_dev_attr(devattr)->index;\
+ struct amc6821_data *data = amc6821_update_device(dev);\
+ return sprintf(buf, "%d\n", data->name[nr] * 1000);\
+}
+
+get_auto_point(temp1_auto_point_temp);
+get_auto_point(temp2_auto_point_temp);
+
+static ssize_t get_pwm1_auto_point_pwm(
+ struct device *dev,
+ struct device_attribute *devattr,
+ char *buf)
+{
+ int nr = to_sensor_dev_attr(devattr)->index;
+ struct amc6821_data *data = amc6821_update_device(dev);
+ return sprintf(buf, "%d\n", data->pwm1_auto_point_pwm[nr]);
+}
+
+
+#define set_temp_auto_point_temp(name, reg)\
+static ssize_t set_##name(\
+ 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 nr = to_sensor_dev_attr(attr)->index;\
+ int val = simple_strtol(buf, NULL, 10); \
+ u8 tmp;\
+ int dt;\
+ int dpwm;\
+ \
+ mutex_lock(&data->update_lock); \
+ switch (nr) {\
+ case 0:\
+ data->name[0] = SENSORS_LIMIT(val / 1000, 0,\
+ data->temp1_auto_point_temp[1]);\
+ data->name[0] = SENSORS_LIMIT(data->name[0], 0,\
+ data->temp2_auto_point_temp[1]);\
+ data->name[0] = SENSORS_LIMIT(data->name[0], 0, 63); \
+ data->valid = 0;\
+ if (i2c_smbus_write_byte_data(\
+ client,\
+ AMC6821_REG_PSV_TEMP,\
+ data->name[0])) {\
+ dev_err(&client->dev,\
+ "Register write error, aborting.
\n");\
+ count = -EIO;\
+ } \
+ goto EXIT;\
+ break;\
+ case 1:\
+ data->name[1] = SENSORS_LIMIT(\
+ val / 1000,\
+ (data->name[0] & 0x7C) + 4,\
+ 124);\
+ data->name[1] &= 0x7C;\
+ data->name[2] = SENSORS_LIMIT(\
+ data->name[2], data->name[1] +
1,\
+ 255);\
+ break;\
+ case 2:\
+ data->name[2] = SENSORS_LIMIT(\
+ val / 1000,\
+ data->name[1]+1,\
+ 255); \
+ break;\
+ } \
+ dt = data->name[2]-data->name[1];\
+ dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_
point_pwm[1];\
+ for (tmp = 4; tmp > 0; tmp--) {\
+ if (dt * (0x20 >> tmp) >= dpwm)\
+ break;\
+ } \
+ tmp |= (data->name[1] & 0x7C) << 1;\
+ if (i2c_smbus_write_byte_data(client, reg, tmp)) {\
+ dev_err(&client->dev, "Register write error, aborting.\n");\
+ count = -EIO;\
+ } \
+ data->valid = 0;\
+EXIT:\
+ mutex_unlock(&data->update_lock); \
+ return count; \
+}
+
+set_temp_auto_point_temp(temp1_auto_point_temp, AMC6821_REG_
LTEMP_FAN_CTRL);
+set_temp_auto_point_temp(temp2_auto_point_temp, AMC6821_REG_
RTEMP_FAN_CTRL);
+
+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 val = simple_strtol(buf, NULL, 10);
+ u8 tmp;
+ int dt;
+ int dpwm;
+
+ 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;
+ }
+
+ dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_
point_pwm[1];
+ dt = data->temp1_auto_point_temp[2]-data->temp1_auto_point_
temp[1];
+ for (tmp = 4; tmp > 0; tmp--) {
+ if (dt * (0x20 >> tmp) >= dpwm)
+ break;
+ }
+ tmp |= (data->temp1_auto_point_temp[1] & 0x7C) << 1;
+ if (i2c_smbus_write_byte_data(client,
+ AMC6821_REG_LTEMP_FAN_CTRL, tmp)) {
+ dev_err(&client->dev, "Register write error, aborting.\n");
+ count = -EIO;
+ }
+
+ dt = data->temp2_auto_point_temp[2]-data->temp2_auto_point_
temp[1];
+ for (tmp = 4; tmp > 0; tmp--) {
+ if (dt * (0x20 >> tmp) >= dpwm)
+ break;
+ }
+ tmp |= (data->temp2_auto_point_temp[1] & 0x7C) << 1;
+ if (i2c_smbus_write_byte_data(client,
+ AMC6821_REG_RTEMP_FAN_CTRL, tmp)) {
+ dev_err(&client->dev, "Register write error, aborting.\n");
+ count = -EIO;
+ }
+ data->valid = 0;
+ mutex_unlock(&data->update_lock);
+ return count;
+}
+
+
+#define get_fan_para(name) static ssize_t get_##name(\
+ struct device *dev,\
+ struct device_attribute *devattr,\
+ char *buf)\
+{ \
+ struct amc6821_data *data = amc6821_update_device(dev); \
+ if (0 == data->name)\
+ return sprintf(buf, "0");\
+ return sprintf(buf, "%d\n", (int)(6000000 / data->name)); \
+}
+
+get_fan_para(fan1_input);
+get_fan_para(fan1_min);
+get_fan_para(fan1_max);
+
+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");
+}
+
+
+#define set_fan_para(name, reg) \
+static ssize_t set_##name(\
+ 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 val = simple_strtol(buf, NULL, 10); \
+ val = 1 > val ? 0xFFFF : 6000000/val; \
+\
+ mutex_lock(&data->update_lock); \
+ data->name = (u16) SENSORS_LIMIT(val, 1, 0xFFFF); \
+ if (i2c_smbus_write_byte_data(client, reg, data->name & 0xFF)) { \
+ dev_err(&client->dev, "Register write error, aborting.\n");\
+ count = -EIO;\
+ } \
+ if (i2c_smbus_write_byte_data(client, reg+1, data->name >> 8)) { \
+ dev_err(&client->dev, "Register write error, aborting.\n");\
+ count = -EIO;\
+ } \
+ mutex_unlock(&data->update_lock); \
+ return count; \
+}
+
+
+set_fan_para(fan1_min, AMC6821_REG_TACH_LLIMITL);
+set_fan_para(fan1_max, AMC6821_REG_TACH_HLIMITL);
+
+
+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);
+ int val = simple_strtol(buf, NULL, 10);
+ int 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);
+ return -EINVAL;
+ }
+ if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4,
config)) {
+ dev_err(&client->dev,
+ "Configuration register write error, aborting.\n");
+ count = -EIO;
+ }
+ mutex_unlock(&data->update_lock);
+ return count;
+}
+
+
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, get_temp1_input,
NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR, get_
temp1_min,
+ set_temp1_min, 0);
+static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, get_
temp1_max,
+ set_temp1_max, 0);
+static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR, get_
temp1_crit,
+ set_temp1_crit, 0);
+static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO,
+ get_temp1_min_alarm, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO,
+ get_temp1_max_alarm, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO,
+ get_temp1_crit_alarm, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO | S_IWUSR,
+ get_temp2_input, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR, get_
temp2_min,
+ set_temp2_min, 0);
+static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR, get_
temp2_max,
+ set_temp2_max, 0);
+static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO | S_IWUSR, get_
temp2_crit,
+ set_temp2_crit, 0);
+static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO,
+ get_temp2_fault, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO,
+ get_temp2_min_alarm, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO,
+ get_temp2_max_alarm, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO,
+ get_temp2_crit_alarm, NULL, 0);
+static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan1_input,
NULL, 0);
+static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO | S_IWUSR,
+ get_fan1_min, set_fan1_min, 0);
+static SENSOR_DEVICE_ATTR(fan1_max, S_IRUGO | S_IWUSR,
+ get_fan1_max, set_fan1_max, 0);
+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(temp1_auto_point1_temp, S_IRUGO,
+ get_temp1_auto_point_temp, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_auto_point2_temp, S_IWUSR | S_
IRUGO,
+ get_temp1_auto_point_temp, set_temp1_auto_point_temp, 1);
+static SENSOR_DEVICE_ATTR(temp1_auto_point3_temp, S_IWUSR | S_
IRUGO,
+ get_temp1_auto_point_temp, set_temp1_auto_point_temp, 2);
+
+static SENSOR_DEVICE_ATTR(temp2_auto_point1_temp, S_IWUSR | S_
IRUGO,
+ get_temp2_auto_point_temp, set_temp2_auto_point_temp, 0);
+static SENSOR_DEVICE_ATTR(temp2_auto_point2_temp, S_IWUSR | S_
IRUGO,
+ get_temp2_auto_point_temp, set_temp2_auto_point_temp, 1);
+static SENSOR_DEVICE_ATTR(temp2_auto_point3_temp, S_IWUSR | S_
IRUGO,
+ get_temp2_auto_point_temp, set_temp2_auto_point_temp, 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,
+ int kind,
+ struct i2c_board_info *info)
+{
+ struct i2c_adapter *adapter = client->adapter;
+ int address = client->addr;
+
+ dev_dbg(&adapter->dev, "amc6821_detect called, kind = %d\n",
kind);
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_
DATA)) {
+ dev_dbg(&adapter->dev,
+ "max6650: I2C bus doesn't support byte read mode,
skipping.\n");
+ return -ENODEV;
+ }
+ if ((kind < 0) &&
+ ((i2c_smbus_read_byte_data(client, AMC6821_REG_DEV_
ID) &
+ 0xDE) ||
+ (i2c_smbus_read_byte_data(client, AMC6821_REG_
COMP_ID) &
+ 0xB6))) {
+ 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;
+ }
+
+ 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;
+
+ mutex_lock(&data->update_lock);
+
+ if (time_after(jiffies, data->last_updated + timeout) ||
+ !data->valid) {
+ data->temp1_input = i2c_smbus_read_byte_data(client,
+ AMC6821_REG_LTEMP_HI);
+ data->temp1_min = i2c_smbus_read_byte_data(client,
+ AMC6821_REG_LTEMP_LIMIT_MIN);
+ data->temp1_max = i2c_smbus_read_byte_data(client,
+ AMC6821_REG_LTEMP_LIMIT_MAX);
+ data->temp1_crit = i2c_smbus_read_byte_data(client,
+ AMC6821_REG_LTEMP_CRIT);
+
+ data->temp2_input = i2c_smbus_read_byte_data(client,
+ AMC6821_REG_RTEMP_HI);
+ data->temp2_min = i2c_smbus_read_byte_data(client,
+ AMC6821_REG_RTEMP_LIMIT_MIN);
+ data->temp2_max = i2c_smbus_read_byte_data(client,
+ AMC6821_REG_RTEMP_LIMIT_MAX);
+ data->temp2_crit = i2c_smbus_read_byte_data(client,
+ AMC6821_REG_RTEMP_CRIT);
+
+ 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);
+ data->fan1_input = i2c_smbus_read_byte_data(client,
+ AMC6821_REG_TDATA_LOW);
+ data->fan1_input += i2c_smbus_read_byte_data(client,
+ AMC6821_REG_TDATA_HI) << 8;
+ data->fan1_min = i2c_smbus_read_byte_data(client,
+ AMC6821_REG_TACH_LLIMITL);
+ data->fan1_min += i2c_smbus_read_byte_data(client,
+ AMC6821_REG_TACH_LLIMITL+1) << 8;
+ data->fan1_max = i2c_smbus_read_byte_data(client,
+ AMC6821_REG_TACH_HLIMITL);
+ data->fan1_max += i2c_smbus_read_byte_data(client,
+ AMC6821_REG_TACH_HLIMITL+1) << 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@...st.arnes.si>");
+MODULE_DESCRIPTION("Texas Instruments amc6821 hwmon driver");
+MODULE_SUPPORTED_DEVICE("amc6821");
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