hwmon: Driver for Maxim MAX6697 and compatibles
authorGuenter Roeck <linux@roeck-us.net>
Sat, 13 Oct 2012 06:01:58 +0000 (23:01 -0700)
committerGuenter Roeck <linux@roeck-us.net>
Wed, 6 Feb 2013 17:57:56 +0000 (09:57 -0800)
Add support for MAX6581, MAX6602, MAX6622, MAX6636, MAX6689, MAX6693,
MAX6694, MAX6697, MAX6698, and MAX6699 temperature sensors

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Jean Delvare <khali@linux-fr.org>
Documentation/devicetree/bindings/i2c/max6697.txt [new file with mode: 0644]
Documentation/hwmon/max6697 [new file with mode: 0644]
drivers/hwmon/Kconfig
drivers/hwmon/Makefile
drivers/hwmon/max6697.c [new file with mode: 0644]
include/linux/platform_data/max6697.h [new file with mode: 0644]

diff --git a/Documentation/devicetree/bindings/i2c/max6697.txt b/Documentation/devicetree/bindings/i2c/max6697.txt
new file mode 100644 (file)
index 0000000..5f79399
--- /dev/null
@@ -0,0 +1,64 @@
+max6697 properties
+
+Required properties:
+- compatible:
+       Should be one of
+               maxim,max6581
+               maxim,max6602
+               maxim,max6622
+               maxim,max6636
+               maxim,max6689
+               maxim,max6693
+               maxim,max6694
+               maxim,max6697
+               maxim,max6698
+               maxim,max6699
+- reg: I2C address
+
+Optional properties:
+
+- smbus-timeout-disable
+       Set to disable SMBus timeout. If not specified, SMBus timeout will be
+       enabled.
+- extended-range-enable
+       Only valid for MAX6581. Set to enable extended temperature range.
+       Extended temperature will be disabled if not specified.
+- beta-compensation-enable
+       Only valid for MAX6693 and MX6694. Set to enable beta compensation on
+       remote temperature channel 1.
+       Beta compensation will be disabled if not specified.
+- alert-mask
+       Alert bit mask. Alert disabled for bits set.
+       Select bit 0 for local temperature, bit 1..7 for remote temperatures.
+       If not specified, alert will be enabled for all channels.
+- over-temperature-mask
+       Over-temperature bit mask. Over-temperature reporting disabled for
+       bits set.
+       Select bit 0 for local temperature, bit 1..7 for remote temperatures.
+       If not specified, over-temperature reporting will be enabled for all
+       channels.
+- resistance-cancellation
+       Boolean for all chips other than MAX6581. Set to enable resistance
+       cancellation on remote temperature channel 1.
+       For MAX6581, resistance cancellation enabled for all channels if
+       specified as boolean, otherwise as per bit mask specified.
+       Only supported for remote temperatures (bit 1..7).
+       If not specified, resistance cancellation will be disabled for all
+       channels.
+- transistor-ideality
+       For MAX6581 only. Two values; first is bit mask, second is ideality
+       select value as per MAX6581 data sheet. Select bit 1..7 for remote
+       channels.
+       Transistor ideality will be initialized to default (1.008) if not
+       specified.
+
+Example:
+
+temp-sensor@1a {
+       compatible = "maxim,max6697";
+       reg = <0x1a>;
+       smbus-timeout-disable;
+       resistance-cancellation;
+       alert-mask = <0x72>;
+       over-temperature-mask = <0x7f>;
+};
diff --git a/Documentation/hwmon/max6697 b/Documentation/hwmon/max6697
new file mode 100644 (file)
index 0000000..6594177
--- /dev/null
@@ -0,0 +1,58 @@
+Kernel driver max6697
+=====================
+
+Supported chips:
+  * Maxim MAX6581
+    Prefix: 'max6581'
+    Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX6581.pdf
+  * Maxim MAX6602
+    Prefix: 'max6602'
+    Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX6602.pdf
+  * Maxim MAX6622
+    Prefix: 'max6622'
+    Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX6622.pdf
+  * Maxim MAX6636
+    Prefix: 'max6636'
+    Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX6636.pdf
+  * Maxim MAX6689
+    Prefix: 'max6689'
+    Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX6689.pdf
+  * Maxim MAX6693
+    Prefix: 'max6693'
+    Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX6693.pdf
+  * Maxim MAX6694
+    Prefix: 'max6694'
+    Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX6694.pdf
+  * Maxim MAX6697
+    Prefix: 'max6697'
+    Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX6697.pdf
+  * Maxim MAX6698
+    Prefix: 'max6698'
+    Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX6698.pdf
+  * Maxim MAX6699
+    Prefix: 'max6699'
+    Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX6699.pdf
+
+Author:
+    Guenter Roeck <linux@roeck-us.net>
+
+Description
+-----------
+
+This driver implements support for several MAX6697 compatible temperature sensor
+chips. The chips support one local temperature sensor plus four, six, or seven
+remote temperature sensors. Remote temperature sensors are diode-connected
+thermal transitors, except for MAX6698 which supports three diode-connected
+thermal transistors plus three thermistors in addition to the local temperature
+sensor.
+
+The driver provides the following sysfs attributes. temp1 is the local (chip)
+temperature, temp[2..n] are remote temperatures. The actually supported
+per-channel attributes are chip type and channel dependent.
+
+tempX_input      RO temperature
+tempX_max        RW temperature maximum threshold
+tempX_max_alarm  RO temperature maximum threshold alarm
+tempX_crit       RW temperature critical threshold
+tempX_crit_alarm RO temperature critical threshold alarm
+tempX_fault      RO temperature diode fault (remote sensors only)
index 32f238f3caea852ad116fa9eab465c945fa0d6e3..ef5757265f7801c4779aa0d881aa2d784448fd2b 100644 (file)
@@ -854,6 +854,17 @@ config SENSORS_MAX6650
          This driver can also be built as a module.  If so, the module
          will be called max6650.
 
+config SENSORS_MAX6697
+       tristate "Maxim MAX6697 and compatibles"
+       depends on I2C
+       help
+         If you say yes here you get support for MAX6581, MAX6602, MAX6622,
+         MAX6636, MAX6689, MAX6693, MAX6694, MAX6697, MAX6698, and MAX6699
+         temperature sensor chips.
+
+         This driver can also be built as a module.  If so, the module
+         will be called max6697.
+
 config SENSORS_MCP3021
        tristate "Microchip MCP3021 and compatibles"
        depends on I2C
index 5da287443f6c3d007ae96b4e7a9d5d912fe3d3d7..a37a82c64da260f0e7734f16dfb157bb6db58f5b 100644 (file)
@@ -99,6 +99,7 @@ obj-$(CONFIG_SENSORS_MAX197)  += max197.o
 obj-$(CONFIG_SENSORS_MAX6639)  += max6639.o
 obj-$(CONFIG_SENSORS_MAX6642)  += max6642.o
 obj-$(CONFIG_SENSORS_MAX6650)  += max6650.o
+obj-$(CONFIG_SENSORS_MAX6697)  += max6697.o
 obj-$(CONFIG_SENSORS_MC13783_ADC)+= mc13783-adc.o
 obj-$(CONFIG_SENSORS_MCP3021)  += mcp3021.o
 obj-$(CONFIG_SENSORS_NTC_THERMISTOR)   += ntc_thermistor.o
diff --git a/drivers/hwmon/max6697.c b/drivers/hwmon/max6697.c
new file mode 100644 (file)
index 0000000..bf4aa37
--- /dev/null
@@ -0,0 +1,726 @@
+/*
+ * Copyright (c) 2012 Guenter Roeck <linux@roeck-us.net>
+ *
+ * based on max1668.c
+ * Copyright (c) 2011 David George <david.george@ska.ac.za>
+ *
+ * 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.
+ */
+
+#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>
+#include <linux/of.h>
+
+#include <linux/platform_data/max6697.h>
+
+enum chips { max6581, max6602, max6622, max6636, max6689, max6693, max6694,
+            max6697, max6698, max6699 };
+
+/* Report local sensor as temp1 */
+
+static const u8 MAX6697_REG_TEMP[] = {
+                       0x07, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x08 };
+static const u8 MAX6697_REG_TEMP_EXT[] = {
+                       0x57, 0x09, 0x52, 0x53, 0x54, 0x55, 0x56, 0 };
+static const u8 MAX6697_REG_MAX[] = {
+                       0x17, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x18 };
+static const u8 MAX6697_REG_CRIT[] = {
+                       0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27 };
+
+/*
+ * Map device tree / platform data register bit map to chip bit map.
+ * Applies to alert register and over-temperature register.
+ */
+#define MAX6697_MAP_BITS(reg)  ((((reg) & 0x7e) >> 1) | \
+                                (((reg) & 0x01) << 6) | ((reg) & 0x80))
+
+#define MAX6697_REG_STAT(n)            (0x44 + (n))
+
+#define MAX6697_REG_CONFIG             0x41
+#define MAX6581_CONF_EXTENDED          (1 << 1)
+#define MAX6693_CONF_BETA              (1 << 2)
+#define MAX6697_CONF_RESISTANCE                (1 << 3)
+#define MAX6697_CONF_TIMEOUT           (1 << 5)
+#define MAX6697_REG_ALERT_MASK         0x42
+#define MAX6697_REG_OVERT_MASK         0x43
+
+#define MAX6581_REG_RESISTANCE         0x4a
+#define MAX6581_REG_IDEALITY           0x4b
+#define MAX6581_REG_IDEALITY_SELECT    0x4c
+#define MAX6581_REG_OFFSET             0x4d
+#define MAX6581_REG_OFFSET_SELECT      0x4e
+
+#define MAX6697_CONV_TIME              156     /* ms per channel, worst case */
+
+struct max6697_chip_data {
+       int channels;
+       u32 have_ext;
+       u32 have_crit;
+       u32 have_fault;
+       u8 valid_conf;
+       const u8 *alarm_map;
+};
+
+struct max6697_data {
+       struct device *hwmon_dev;
+
+       enum chips type;
+       const struct max6697_chip_data *chip;
+
+       int update_interval;    /* in milli-seconds */
+       int temp_offset;        /* in degrees C */
+
+       struct mutex update_lock;
+       unsigned long last_updated;     /* In jiffies */
+       bool valid;             /* true if following fields are valid */
+
+       /* 1x local and up to 7x remote */
+       u8 temp[8][4];          /* [nr][0]=temp [1]=ext [2]=max [3]=crit */
+#define MAX6697_TEMP_INPUT     0
+#define MAX6697_TEMP_EXT       1
+#define MAX6697_TEMP_MAX       2
+#define MAX6697_TEMP_CRIT      3
+       u32 alarms;
+};
+
+/* Diode fault status bits on MAX6581 are right shifted by one bit */
+static const u8 max6581_alarm_map[] = {
+        0, 0, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15,
+        16, 17, 18, 19, 20, 21, 22, 23 };
+
+static const struct max6697_chip_data max6697_chip_data[] = {
+       [max6581] = {
+               .channels = 8,
+               .have_crit = 0xff,
+               .have_ext = 0x7f,
+               .have_fault = 0xfe,
+               .valid_conf = MAX6581_CONF_EXTENDED | MAX6697_CONF_TIMEOUT,
+               .alarm_map = max6581_alarm_map,
+       },
+       [max6602] = {
+               .channels = 5,
+               .have_crit = 0x12,
+               .have_ext = 0x02,
+               .have_fault = 0x1e,
+               .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
+       },
+       [max6622] = {
+               .channels = 5,
+               .have_crit = 0x12,
+               .have_ext = 0x02,
+               .have_fault = 0x1e,
+               .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
+       },
+       [max6636] = {
+               .channels = 7,
+               .have_crit = 0x72,
+               .have_ext = 0x02,
+               .have_fault = 0x7e,
+               .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
+       },
+       [max6689] = {
+               .channels = 7,
+               .have_crit = 0x72,
+               .have_ext = 0x02,
+               .have_fault = 0x7e,
+               .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
+       },
+       [max6693] = {
+               .channels = 7,
+               .have_crit = 0x72,
+               .have_ext = 0x02,
+               .have_fault = 0x7e,
+               .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
+                 MAX6697_CONF_TIMEOUT,
+       },
+       [max6694] = {
+               .channels = 5,
+               .have_crit = 0x12,
+               .have_ext = 0x02,
+               .have_fault = 0x1e,
+               .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
+                 MAX6697_CONF_TIMEOUT,
+       },
+       [max6697] = {
+               .channels = 7,
+               .have_crit = 0x72,
+               .have_ext = 0x02,
+               .have_fault = 0x7e,
+               .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
+       },
+       [max6698] = {
+               .channels = 7,
+               .have_crit = 0x72,
+               .have_ext = 0x02,
+               .have_fault = 0x0e,
+               .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
+       },
+       [max6699] = {
+               .channels = 5,
+               .have_crit = 0x12,
+               .have_ext = 0x02,
+               .have_fault = 0x1e,
+               .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
+       },
+};
+
+static struct max6697_data *max6697_update_device(struct device *dev)
+{
+       struct i2c_client *client = to_i2c_client(dev);
+       struct max6697_data *data = i2c_get_clientdata(client);
+       struct max6697_data *ret = data;
+       int val;
+       int i;
+       u32 alarms;
+
+       mutex_lock(&data->update_lock);
+
+       if (data->valid &&
+           !time_after(jiffies, data->last_updated
+                       + msecs_to_jiffies(data->update_interval)))
+               goto abort;
+
+       for (i = 0; i < data->chip->channels; i++) {
+               if (data->chip->have_ext & (1 << i)) {
+                       val = i2c_smbus_read_byte_data(client,
+                                                      MAX6697_REG_TEMP_EXT[i]);
+                       if (unlikely(val < 0)) {
+                               ret = ERR_PTR(val);
+                               goto abort;
+                       }
+                       data->temp[i][MAX6697_TEMP_EXT] = val;
+               }
+
+               val = i2c_smbus_read_byte_data(client, MAX6697_REG_TEMP[i]);
+               if (unlikely(val < 0)) {
+                       ret = ERR_PTR(val);
+                       goto abort;
+               }
+               data->temp[i][MAX6697_TEMP_INPUT] = val;
+
+               val = i2c_smbus_read_byte_data(client, MAX6697_REG_MAX[i]);
+               if (unlikely(val < 0)) {
+                       ret = ERR_PTR(val);
+                       goto abort;
+               }
+               data->temp[i][MAX6697_TEMP_MAX] = val;
+
+               if (data->chip->have_crit & (1 << i)) {
+                       val = i2c_smbus_read_byte_data(client,
+                                                      MAX6697_REG_CRIT[i]);
+                       if (unlikely(val < 0)) {
+                               ret = ERR_PTR(val);
+                               goto abort;
+                       }
+                       data->temp[i][MAX6697_TEMP_CRIT] = val;
+               }
+       }
+
+       alarms = 0;
+       for (i = 0; i < 3; i++) {
+               val = i2c_smbus_read_byte_data(client, MAX6697_REG_STAT(i));
+               if (unlikely(val < 0)) {
+                       ret = ERR_PTR(val);
+                       goto abort;
+               }
+               alarms = (alarms << 8) | val;
+       }
+       data->alarms = alarms;
+       data->last_updated = jiffies;
+       data->valid = true;
+abort:
+       mutex_unlock(&data->update_lock);
+
+       return ret;
+}
+
+static ssize_t show_temp_input(struct device *dev,
+                              struct device_attribute *devattr, char *buf)
+{
+       int index = to_sensor_dev_attr(devattr)->index;
+       struct max6697_data *data = max6697_update_device(dev);
+       int temp;
+
+       if (IS_ERR(data))
+               return PTR_ERR(data);
+
+       temp = (data->temp[index][MAX6697_TEMP_INPUT] - data->temp_offset) << 3;
+       temp |= data->temp[index][MAX6697_TEMP_EXT] >> 5;
+
+       return sprintf(buf, "%d\n", temp * 125);
+}
+
+static ssize_t show_temp(struct device *dev,
+                        struct device_attribute *devattr, char *buf)
+{
+       int nr = to_sensor_dev_attr_2(devattr)->nr;
+       int index = to_sensor_dev_attr_2(devattr)->index;
+       struct max6697_data *data = max6697_update_device(dev);
+       int temp;
+
+       if (IS_ERR(data))
+               return PTR_ERR(data);
+
+       temp = data->temp[nr][index];
+       temp -= data->temp_offset;
+
+       return sprintf(buf, "%d\n", temp * 1000);
+}
+
+static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
+                         char *buf)
+{
+       int index = to_sensor_dev_attr(attr)->index;
+       struct max6697_data *data = max6697_update_device(dev);
+
+       if (IS_ERR(data))
+               return PTR_ERR(data);
+
+       if (data->chip->alarm_map)
+               index = data->chip->alarm_map[index];
+
+       return sprintf(buf, "%u\n", (data->alarms >> index) & 0x1);
+}
+
+static ssize_t set_temp(struct device *dev,
+                       struct device_attribute *devattr,
+                       const char *buf, size_t count)
+{
+       int nr = to_sensor_dev_attr_2(devattr)->nr;
+       int index = to_sensor_dev_attr_2(devattr)->index;
+       struct i2c_client *client = to_i2c_client(dev);
+       struct max6697_data *data = i2c_get_clientdata(client);
+       long temp;
+       int ret;
+
+       ret = kstrtol(buf, 10, &temp);
+       if (ret < 0)
+               return ret;
+
+       mutex_lock(&data->update_lock);
+       temp = DIV_ROUND_CLOSEST(temp, 1000) + data->temp_offset;
+       temp = clamp_val(temp, 0, data->type == max6581 ? 255 : 127);
+       data->temp[nr][index] = temp;
+       ret = i2c_smbus_write_byte_data(client,
+                                       index == 2 ? MAX6697_REG_MAX[nr]
+                                                  : MAX6697_REG_CRIT[nr],
+                                       temp);
+       mutex_unlock(&data->update_lock);
+
+       return ret < 0 ? ret : count;
+}
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL, 0);
+static SENSOR_DEVICE_ATTR_2(temp1_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
+                           0, MAX6697_TEMP_MAX);
+static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
+                           0, MAX6697_TEMP_CRIT);
+
+static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input, NULL, 1);
+static SENSOR_DEVICE_ATTR_2(temp2_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
+                           1, MAX6697_TEMP_MAX);
+static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
+                           1, MAX6697_TEMP_CRIT);
+
+static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp_input, NULL, 2);
+static SENSOR_DEVICE_ATTR_2(temp3_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
+                           2, MAX6697_TEMP_MAX);
+static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
+                           2, MAX6697_TEMP_CRIT);
+
+static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp_input, NULL, 3);
+static SENSOR_DEVICE_ATTR_2(temp4_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
+                           3, MAX6697_TEMP_MAX);
+static SENSOR_DEVICE_ATTR_2(temp4_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
+                           3, MAX6697_TEMP_CRIT);
+
+static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp_input, NULL, 4);
+static SENSOR_DEVICE_ATTR_2(temp5_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
+                           4, MAX6697_TEMP_MAX);
+static SENSOR_DEVICE_ATTR_2(temp5_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
+                           4, MAX6697_TEMP_CRIT);
+
+static SENSOR_DEVICE_ATTR(temp6_input, S_IRUGO, show_temp_input, NULL, 5);
+static SENSOR_DEVICE_ATTR_2(temp6_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
+                           5, MAX6697_TEMP_MAX);
+static SENSOR_DEVICE_ATTR_2(temp6_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
+                           5, MAX6697_TEMP_CRIT);
+
+static SENSOR_DEVICE_ATTR(temp7_input, S_IRUGO, show_temp_input, NULL, 6);
+static SENSOR_DEVICE_ATTR_2(temp7_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
+                           6, MAX6697_TEMP_MAX);
+static SENSOR_DEVICE_ATTR_2(temp7_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
+                           6, MAX6697_TEMP_CRIT);
+
+static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, show_temp_input, NULL, 7);
+static SENSOR_DEVICE_ATTR_2(temp8_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
+                           7, MAX6697_TEMP_MAX);
+static SENSOR_DEVICE_ATTR_2(temp8_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
+                           7, MAX6697_TEMP_CRIT);
+
+static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 22);
+static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 16);
+static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 17);
+static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 18);
+static SENSOR_DEVICE_ATTR(temp5_max_alarm, S_IRUGO, show_alarm, NULL, 19);
+static SENSOR_DEVICE_ATTR(temp6_max_alarm, S_IRUGO, show_alarm, NULL, 20);
+static SENSOR_DEVICE_ATTR(temp7_max_alarm, S_IRUGO, show_alarm, NULL, 21);
+static SENSOR_DEVICE_ATTR(temp8_max_alarm, S_IRUGO, show_alarm, NULL, 23);
+
+static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 14);
+static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 8);
+static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 9);
+static SENSOR_DEVICE_ATTR(temp4_crit_alarm, S_IRUGO, show_alarm, NULL, 10);
+static SENSOR_DEVICE_ATTR(temp5_crit_alarm, S_IRUGO, show_alarm, NULL, 11);
+static SENSOR_DEVICE_ATTR(temp6_crit_alarm, S_IRUGO, show_alarm, NULL, 12);
+static SENSOR_DEVICE_ATTR(temp7_crit_alarm, S_IRUGO, show_alarm, NULL, 13);
+static SENSOR_DEVICE_ATTR(temp8_crit_alarm, S_IRUGO, show_alarm, NULL, 15);
+
+static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_alarm, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_alarm, NULL, 4);
+static SENSOR_DEVICE_ATTR(temp6_fault, S_IRUGO, show_alarm, NULL, 5);
+static SENSOR_DEVICE_ATTR(temp7_fault, S_IRUGO, show_alarm, NULL, 6);
+static SENSOR_DEVICE_ATTR(temp8_fault, S_IRUGO, show_alarm, NULL, 7);
+
+static struct attribute *max6697_attributes[8][7] = {
+       {
+               &sensor_dev_attr_temp1_input.dev_attr.attr,
+               &sensor_dev_attr_temp1_max.dev_attr.attr,
+               &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
+               &sensor_dev_attr_temp1_crit.dev_attr.attr,
+               &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
+               NULL
+       }, {
+               &sensor_dev_attr_temp2_input.dev_attr.attr,
+               &sensor_dev_attr_temp2_max.dev_attr.attr,
+               &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
+               &sensor_dev_attr_temp2_crit.dev_attr.attr,
+               &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
+               &sensor_dev_attr_temp2_fault.dev_attr.attr,
+               NULL
+       }, {
+               &sensor_dev_attr_temp3_input.dev_attr.attr,
+               &sensor_dev_attr_temp3_max.dev_attr.attr,
+               &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
+               &sensor_dev_attr_temp3_crit.dev_attr.attr,
+               &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
+               &sensor_dev_attr_temp3_fault.dev_attr.attr,
+               NULL
+       }, {
+               &sensor_dev_attr_temp4_input.dev_attr.attr,
+               &sensor_dev_attr_temp4_max.dev_attr.attr,
+               &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
+               &sensor_dev_attr_temp4_crit.dev_attr.attr,
+               &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
+               &sensor_dev_attr_temp4_fault.dev_attr.attr,
+               NULL
+       }, {
+               &sensor_dev_attr_temp5_input.dev_attr.attr,
+               &sensor_dev_attr_temp5_max.dev_attr.attr,
+               &sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
+               &sensor_dev_attr_temp5_crit.dev_attr.attr,
+               &sensor_dev_attr_temp5_crit_alarm.dev_attr.attr,
+               &sensor_dev_attr_temp5_fault.dev_attr.attr,
+               NULL
+       }, {
+               &sensor_dev_attr_temp6_input.dev_attr.attr,
+               &sensor_dev_attr_temp6_max.dev_attr.attr,
+               &sensor_dev_attr_temp6_max_alarm.dev_attr.attr,
+               &sensor_dev_attr_temp6_crit.dev_attr.attr,
+               &sensor_dev_attr_temp6_crit_alarm.dev_attr.attr,
+               &sensor_dev_attr_temp6_fault.dev_attr.attr,
+               NULL
+       }, {
+               &sensor_dev_attr_temp7_input.dev_attr.attr,
+               &sensor_dev_attr_temp7_max.dev_attr.attr,
+               &sensor_dev_attr_temp7_max_alarm.dev_attr.attr,
+               &sensor_dev_attr_temp7_crit.dev_attr.attr,
+               &sensor_dev_attr_temp7_crit_alarm.dev_attr.attr,
+               &sensor_dev_attr_temp7_fault.dev_attr.attr,
+               NULL
+       }, {
+               &sensor_dev_attr_temp8_input.dev_attr.attr,
+               &sensor_dev_attr_temp8_max.dev_attr.attr,
+               &sensor_dev_attr_temp8_max_alarm.dev_attr.attr,
+               &sensor_dev_attr_temp8_crit.dev_attr.attr,
+               &sensor_dev_attr_temp8_crit_alarm.dev_attr.attr,
+               &sensor_dev_attr_temp8_fault.dev_attr.attr,
+               NULL
+       }
+};
+
+static const struct attribute_group max6697_group[8] = {
+       { .attrs = max6697_attributes[0] },
+       { .attrs = max6697_attributes[1] },
+       { .attrs = max6697_attributes[2] },
+       { .attrs = max6697_attributes[3] },
+       { .attrs = max6697_attributes[4] },
+       { .attrs = max6697_attributes[5] },
+       { .attrs = max6697_attributes[6] },
+       { .attrs = max6697_attributes[7] },
+};
+
+static void max6697_get_config_of(struct device_node *node,
+                                 struct max6697_platform_data *pdata)
+{
+       int len;
+       const __be32 *prop;
+
+       prop = of_get_property(node, "smbus-timeout-disable", &len);
+       if (prop)
+               pdata->smbus_timeout_disable = true;
+       prop = of_get_property(node, "extended-range-enable", &len);
+       if (prop)
+               pdata->extended_range_enable = true;
+       prop = of_get_property(node, "beta-compensation-enable", &len);
+       if (prop)
+               pdata->beta_compensation = true;
+       prop = of_get_property(node, "alert-mask", &len);
+       if (prop && len == sizeof(u32))
+               pdata->alert_mask = be32_to_cpu(prop[0]);
+       prop = of_get_property(node, "over-temperature-mask", &len);
+       if (prop && len == sizeof(u32))
+               pdata->over_temperature_mask = be32_to_cpu(prop[0]);
+       prop = of_get_property(node, "resistance-cancellation", &len);
+       if (prop) {
+               if (len == sizeof(u32))
+                       pdata->resistance_cancellation = be32_to_cpu(prop[0]);
+               else
+                       pdata->resistance_cancellation = 0xfe;
+       }
+       prop = of_get_property(node, "transistor-ideality", &len);
+       if (prop && len == 2 * sizeof(u32)) {
+                       pdata->ideality_mask = be32_to_cpu(prop[0]);
+                       pdata->ideality_value = be32_to_cpu(prop[1]);
+       }
+}
+
+static int max6697_init_chip(struct i2c_client *client)
+{
+       struct max6697_data *data = i2c_get_clientdata(client);
+       struct max6697_platform_data *pdata = dev_get_platdata(&client->dev);
+       struct max6697_platform_data p;
+       const struct max6697_chip_data *chip = data->chip;
+       int factor = chip->channels;
+       int ret, reg;
+
+       /*
+        * Don't touch configuration if neither platform data nor OF
+        * configuration was specified. If that is the case, use the
+        * current chip configuration.
+        */
+       if (!pdata && !client->dev.of_node) {
+               reg = i2c_smbus_read_byte_data(client, MAX6697_REG_CONFIG);
+               if (reg < 0)
+                       return reg;
+               if (data->type == max6581) {
+                       if (reg & MAX6581_CONF_EXTENDED)
+                               data->temp_offset = 64;
+                       reg = i2c_smbus_read_byte_data(client,
+                                                      MAX6581_REG_RESISTANCE);
+                       if (reg < 0)
+                               return reg;
+                       factor += hweight8(reg);
+               } else {
+                       if (reg & MAX6697_CONF_RESISTANCE)
+                               factor++;
+               }
+               goto done;
+       }
+
+       if (client->dev.of_node) {
+               memset(&p, 0, sizeof(p));
+               max6697_get_config_of(client->dev.of_node, &p);
+               pdata = &p;
+       }
+
+       reg = 0;
+       if (pdata->smbus_timeout_disable &&
+           (chip->valid_conf & MAX6697_CONF_TIMEOUT)) {
+               reg |= MAX6697_CONF_TIMEOUT;
+       }
+       if (pdata->extended_range_enable &&
+           (chip->valid_conf & MAX6581_CONF_EXTENDED)) {
+               reg |= MAX6581_CONF_EXTENDED;
+               data->temp_offset = 64;
+       }
+       if (pdata->resistance_cancellation &&
+           (chip->valid_conf & MAX6697_CONF_RESISTANCE)) {
+               reg |= MAX6697_CONF_RESISTANCE;
+               factor++;
+       }
+       if (pdata->beta_compensation &&
+           (chip->valid_conf & MAX6693_CONF_BETA)) {
+               reg |= MAX6693_CONF_BETA;
+       }
+
+       ret = i2c_smbus_write_byte_data(client, MAX6697_REG_CONFIG, reg);
+       if (ret < 0)
+               return ret;
+
+       ret = i2c_smbus_write_byte_data(client, MAX6697_REG_ALERT_MASK,
+                                       MAX6697_MAP_BITS(pdata->alert_mask));
+       if (ret < 0)
+               return ret;
+
+       ret = i2c_smbus_write_byte_data(client, MAX6697_REG_OVERT_MASK,
+                               MAX6697_MAP_BITS(pdata->over_temperature_mask));
+       if (ret < 0)
+               return ret;
+
+       if (data->type == max6581) {
+               factor += hweight8(pdata->resistance_cancellation >> 1);
+               ret = i2c_smbus_write_byte_data(client, MAX6581_REG_RESISTANCE,
+                                       pdata->resistance_cancellation >> 1);
+               if (ret < 0)
+                       return ret;
+               ret = i2c_smbus_write_byte_data(client, MAX6581_REG_IDEALITY,
+                                               pdata->ideality_mask >> 1);
+               if (ret < 0)
+                       return ret;
+               ret = i2c_smbus_write_byte_data(client,
+                                               MAX6581_REG_IDEALITY_SELECT,
+                                               pdata->ideality_value);
+               if (ret < 0)
+                       return ret;
+       }
+done:
+       data->update_interval = factor * MAX6697_CONV_TIME;
+       return 0;
+}
+
+static void max6697_remove_files(struct i2c_client *client)
+{
+       int i;
+
+       for (i = 0; i < ARRAY_SIZE(max6697_group); i++)
+               sysfs_remove_group(&client->dev.kobj, &max6697_group[i]);
+}
+
+static int max6697_probe(struct i2c_client *client,
+                        const struct i2c_device_id *id)
+{
+       struct i2c_adapter *adapter = client->adapter;
+       struct device *dev = &client->dev;
+       struct max6697_data *data;
+       int i, err;
+
+       if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+               return -ENODEV;
+
+       data = devm_kzalloc(dev, sizeof(struct max6697_data), GFP_KERNEL);
+       if (!data)
+               return -ENOMEM;
+
+       data->type = id->driver_data;
+       data->chip = &max6697_chip_data[data->type];
+
+       i2c_set_clientdata(client, data);
+       mutex_init(&data->update_lock);
+
+       err = max6697_init_chip(client);
+       if (err)
+               return err;
+
+       for (i = 0; i < data->chip->channels; i++) {
+               err = sysfs_create_file(&dev->kobj,
+                                       max6697_attributes[i][0]);
+               if (err)
+                       goto error;
+               err = sysfs_create_file(&dev->kobj,
+                                       max6697_attributes[i][1]);
+               if (err)
+                       goto error;
+               err = sysfs_create_file(&dev->kobj,
+                                       max6697_attributes[i][2]);
+               if (err)
+                       goto error;
+
+               if (data->chip->have_crit & (1 << i)) {
+                       err = sysfs_create_file(&dev->kobj,
+                                               max6697_attributes[i][3]);
+                       if (err)
+                               goto error;
+                       err = sysfs_create_file(&dev->kobj,
+                                               max6697_attributes[i][4]);
+                       if (err)
+                               goto error;
+               }
+               if (data->chip->have_fault & (1 << i)) {
+                       err = sysfs_create_file(&dev->kobj,
+                                               max6697_attributes[i][5]);
+                       if (err)
+                               goto error;
+               }
+       }
+
+       data->hwmon_dev = hwmon_device_register(dev);
+       if (IS_ERR(data->hwmon_dev)) {
+               err = PTR_ERR(data->hwmon_dev);
+               goto error;
+       }
+
+       return 0;
+
+error:
+       max6697_remove_files(client);
+       return err;
+}
+
+static int max6697_remove(struct i2c_client *client)
+{
+       struct max6697_data *data = i2c_get_clientdata(client);
+
+       hwmon_device_unregister(data->hwmon_dev);
+       max6697_remove_files(client);
+
+       return 0;
+}
+
+static const struct i2c_device_id max6697_id[] = {
+       { "max6581", max6581 },
+       { "max6602", max6602 },
+       { "max6622", max6622 },
+       { "max6636", max6636 },
+       { "max6689", max6689 },
+       { "max6693", max6693 },
+       { "max6694", max6694 },
+       { "max6697", max6697 },
+       { "max6698", max6698 },
+       { "max6699", max6699 },
+       { }
+};
+MODULE_DEVICE_TABLE(i2c, max6697_id);
+
+static struct i2c_driver max6697_driver = {
+       .class = I2C_CLASS_HWMON,
+       .driver = {
+               .name   = "max6697",
+       },
+       .probe = max6697_probe,
+       .remove = max6697_remove,
+       .id_table = max6697_id,
+};
+
+module_i2c_driver(max6697_driver);
+
+MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
+MODULE_DESCRIPTION("MAX6697 temperature sensor driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/platform_data/max6697.h b/include/linux/platform_data/max6697.h
new file mode 100644 (file)
index 0000000..ed9d3b3
--- /dev/null
@@ -0,0 +1,36 @@
+/*
+ * max6697.h
+ *     Copyright (c) 2012 Guenter Roeck <linux@roeck-us.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef MAX6697_H
+#define MAX6697_H
+
+#include <linux/types.h>
+
+/*
+ * For all bit masks:
+ * bit 0:    local temperature
+ * bit 1..7: remote temperatures
+ */
+struct max6697_platform_data {
+       bool smbus_timeout_disable;     /* set to disable SMBus timeouts */
+       bool extended_range_enable;     /* set to enable extended temp range */
+       bool beta_compensation;         /* set to enable beta compensation */
+       u8 alert_mask;                  /* set bit to 1 to disable alert */
+       u8 over_temperature_mask;       /* set bit to 1 to disable */
+       u8 resistance_cancellation;     /* set bit to 0 to disable
+                                        * bit mask for MAX6581,
+                                        * boolean for other chips
+                                        */
+       u8 ideality_mask;               /* set bit to 0 to disable */
+       u8 ideality_value;              /* transistor ideality as per
+                                        * MAX6581 datasheet
+                                        */
+};
+
+#endif /* MAX6697_H */