--- /dev/null
+/*
+ * Copyright (c) 2011 David George <david.george@ska.ac.za>
+ *
+ * based on adm1021.c
+ * some credit to Christoph Scheurer, but largely a rewrite
+ *
+ * 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/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 max1668_addr_list[] = {
+ 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
+
+/* max1668 registers */
+
+#define MAX1668_REG_TEMP(nr) (nr)
+#define MAX1668_REG_STAT1 0x05
+#define MAX1668_REG_STAT2 0x06
+#define MAX1668_REG_MAN_ID 0xfe
+#define MAX1668_REG_DEV_ID 0xff
+
+/* limits */
+
+/* write high limits */
+#define MAX1668_REG_LIMH_WR(nr) (0x13 + 2 * (nr))
+/* write low limits */
+#define MAX1668_REG_LIML_WR(nr) (0x14 + 2 * (nr))
+/* read high limits */
+#define MAX1668_REG_LIMH_RD(nr) (0x08 + 2 * (nr))
+/* read low limits */
+#define MAX1668_REG_LIML_RD(nr) (0x09 + 2 * (nr))
+
+/* manufacturer and device ID Constants */
+#define MAN_ID_MAXIM 0x4d
+#define DEV_ID_MAX1668 0x3
+#define DEV_ID_MAX1805 0x5
+#define DEV_ID_MAX1989 0xb
+
+/* read only mode module parameter */
+static bool read_only;
+module_param(read_only, bool, 0);
+MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");
+
+enum chips { max1668, max1805, max1989 };
+
+struct max1668_data {
+ struct i2c_client *client;
+ const struct attribute_group *groups[3];
+ enum chips type;
+
+ struct mutex update_lock;
+ char valid; /* !=0 if following fields are valid */
+ unsigned long last_updated; /* In jiffies */
+
+ /* 1x local and 4x remote */
+ s8 temp_max[5];
+ s8 temp_min[5];
+ s8 temp[5];
+ u16 alarms;
+};
+
+static struct max1668_data *max1668_update_device(struct device *dev)
+{
+ struct max1668_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = data->client;
+ struct max1668_data *ret = data;
+ s32 val;
+ int i;
+
+ mutex_lock(&data->update_lock);
+
+ if (data->valid && !time_after(jiffies,
+ data->last_updated + HZ + HZ / 2))
+ goto abort;
+
+ for (i = 0; i < 5; i++) {
+ val = i2c_smbus_read_byte_data(client, MAX1668_REG_TEMP(i));
+ if (unlikely(val < 0)) {
+ ret = ERR_PTR(val);
+ goto abort;
+ }
+ data->temp[i] = (s8) val;
+
+ val = i2c_smbus_read_byte_data(client, MAX1668_REG_LIMH_RD(i));
+ if (unlikely(val < 0)) {
+ ret = ERR_PTR(val);
+ goto abort;
+ }
+ data->temp_max[i] = (s8) val;
+
+ val = i2c_smbus_read_byte_data(client, MAX1668_REG_LIML_RD(i));
+ if (unlikely(val < 0)) {
+ ret = ERR_PTR(val);
+ goto abort;
+ }
+ data->temp_min[i] = (s8) val;
+ }
+
+ val = i2c_smbus_read_byte_data(client, MAX1668_REG_STAT1);
+ if (unlikely(val < 0)) {
+ ret = ERR_PTR(val);
+ goto abort;
+ }
+ data->alarms = val << 8;
+
+ val = i2c_smbus_read_byte_data(client, MAX1668_REG_STAT2);
+ if (unlikely(val < 0)) {
+ ret = ERR_PTR(val);
+ goto abort;
+ }
+ data->alarms |= val;
+
+ data->last_updated = jiffies;
+ data->valid = 1;
+abort:
+ mutex_unlock(&data->update_lock);
+
+ return ret;
+}
+
+static ssize_t show_temp(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ int index = to_sensor_dev_attr(devattr)->index;
+ struct max1668_data *data = max1668_update_device(dev);
+
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ return sprintf(buf, "%d\n", data->temp[index] * 1000);
+}
+
+static ssize_t show_temp_max(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ int index = to_sensor_dev_attr(devattr)->index;
+ struct max1668_data *data = max1668_update_device(dev);
+
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ return sprintf(buf, "%d\n", data->temp_max[index] * 1000);
+}
+
+static ssize_t show_temp_min(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ int index = to_sensor_dev_attr(devattr)->index;
+ struct max1668_data *data = max1668_update_device(dev);
+
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ return sprintf(buf, "%d\n", data->temp_min[index] * 1000);
+}
+
+static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ int index = to_sensor_dev_attr(attr)->index;
+ struct max1668_data *data = max1668_update_device(dev);
+
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ return sprintf(buf, "%u\n", (data->alarms >> index) & 0x1);
+}
+
+static ssize_t show_fault(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ int index = to_sensor_dev_attr(devattr)->index;
+ struct max1668_data *data = max1668_update_device(dev);
+
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ return sprintf(buf, "%u\n",
+ (data->alarms & (1 << 12)) && data->temp[index] == 127);
+}
+
+static ssize_t set_temp_max(struct device *dev,
+ struct device_attribute *devattr,
+ const char *buf, size_t count)
+{
+ int index = to_sensor_dev_attr(devattr)->index;
+ struct max1668_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = data->client;
+ long temp;
+ int ret;
+
+ ret = kstrtol(buf, 10, &temp);
+ if (ret < 0)
+ return ret;
+
+ mutex_lock(&data->update_lock);
+ data->temp_max[index] = clamp_val(temp/1000, -128, 127);
+ ret = i2c_smbus_write_byte_data(client,
+ MAX1668_REG_LIMH_WR(index),
+ data->temp_max[index]);
+ if (ret < 0)
+ count = ret;
+ mutex_unlock(&data->update_lock);
+
+ return count;
+}
+
+static ssize_t set_temp_min(struct device *dev,
+ struct device_attribute *devattr,
+ const char *buf, size_t count)
+{
+ int index = to_sensor_dev_attr(devattr)->index;
+ struct max1668_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = data->client;
+ long temp;
+ int ret;
+
+ ret = kstrtol(buf, 10, &temp);
+ if (ret < 0)
+ return ret;
+
+ mutex_lock(&data->update_lock);
+ data->temp_min[index] = clamp_val(temp/1000, -128, 127);
+ ret = i2c_smbus_write_byte_data(client,
+ MAX1668_REG_LIML_WR(index),
+ data->temp_min[index]);
+ if (ret < 0)
+ count = ret;
+ mutex_unlock(&data->update_lock);
+
+ return count;
+}
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp_max,
+ set_temp_max, 0);
+static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO, show_temp_min,
+ set_temp_min, 0);
+static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO, show_temp_max,
+ set_temp_max, 1);
+static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO, show_temp_min,
+ set_temp_min, 1);
+static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO, show_temp_max,
+ set_temp_max, 2);
+static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO, show_temp_min,
+ set_temp_min, 2);
+static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp4_max, S_IRUGO, show_temp_max,
+ set_temp_max, 3);
+static SENSOR_DEVICE_ATTR(temp4_min, S_IRUGO, show_temp_min,
+ set_temp_min, 3);
+static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp, NULL, 4);
+static SENSOR_DEVICE_ATTR(temp5_max, S_IRUGO, show_temp_max,
+ set_temp_max, 4);
+static SENSOR_DEVICE_ATTR(temp5_min, S_IRUGO, show_temp_min,
+ set_temp_min, 4);
+
+static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 14);
+static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 13);
+static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 7);
+static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 6);
+static SENSOR_DEVICE_ATTR(temp3_min_alarm, S_IRUGO, show_alarm, NULL, 5);
+static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 4);
+static SENSOR_DEVICE_ATTR(temp4_min_alarm, S_IRUGO, show_alarm, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp5_min_alarm, S_IRUGO, show_alarm, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp5_max_alarm, S_IRUGO, show_alarm, NULL, 0);
+
+static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_fault, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_fault, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_fault, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_fault, NULL, 4);
+
+/* Attributes common to MAX1668, MAX1989 and MAX1805 */
+static struct attribute *max1668_attribute_common[] = {
+ &sensor_dev_attr_temp1_max.dev_attr.attr,
+ &sensor_dev_attr_temp1_min.dev_attr.attr,
+ &sensor_dev_attr_temp1_input.dev_attr.attr,
+ &sensor_dev_attr_temp2_max.dev_attr.attr,
+ &sensor_dev_attr_temp2_min.dev_attr.attr,
+ &sensor_dev_attr_temp2_input.dev_attr.attr,
+ &sensor_dev_attr_temp3_max.dev_attr.attr,
+ &sensor_dev_attr_temp3_min.dev_attr.attr,
+ &sensor_dev_attr_temp3_input.dev_attr.attr,
+
+ &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
+
+ &sensor_dev_attr_temp2_fault.dev_attr.attr,
+ &sensor_dev_attr_temp3_fault.dev_attr.attr,
+ NULL
+};
+
+/* Attributes not present on MAX1805 */
+static struct attribute *max1668_attribute_unique[] = {
+ &sensor_dev_attr_temp4_max.dev_attr.attr,
+ &sensor_dev_attr_temp4_min.dev_attr.attr,
+ &sensor_dev_attr_temp4_input.dev_attr.attr,
+ &sensor_dev_attr_temp5_max.dev_attr.attr,
+ &sensor_dev_attr_temp5_min.dev_attr.attr,
+ &sensor_dev_attr_temp5_input.dev_attr.attr,
+
+ &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp5_min_alarm.dev_attr.attr,
+
+ &sensor_dev_attr_temp4_fault.dev_attr.attr,
+ &sensor_dev_attr_temp5_fault.dev_attr.attr,
+ NULL
+};
+
+static umode_t max1668_attribute_mode(struct kobject *kobj,
+ struct attribute *attr, int index)
+{
+ umode_t ret = S_IRUGO;
+ if (read_only)
+ return ret;
+ if (attr == &sensor_dev_attr_temp1_max.dev_attr.attr ||
+ attr == &sensor_dev_attr_temp2_max.dev_attr.attr ||
+ attr == &sensor_dev_attr_temp3_max.dev_attr.attr ||
+ attr == &sensor_dev_attr_temp4_max.dev_attr.attr ||
+ attr == &sensor_dev_attr_temp5_max.dev_attr.attr ||
+ attr == &sensor_dev_attr_temp1_min.dev_attr.attr ||
+ attr == &sensor_dev_attr_temp2_min.dev_attr.attr ||
+ attr == &sensor_dev_attr_temp3_min.dev_attr.attr ||
+ attr == &sensor_dev_attr_temp4_min.dev_attr.attr ||
+ attr == &sensor_dev_attr_temp5_min.dev_attr.attr)
+ ret |= S_IWUSR;
+ return ret;
+}
+
+static const struct attribute_group max1668_group_common = {
+ .attrs = max1668_attribute_common,
+ .is_visible = max1668_attribute_mode
+};
+
+static const struct attribute_group max1668_group_unique = {
+ .attrs = max1668_attribute_unique,
+ .is_visible = max1668_attribute_mode
+};
+
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int max1668_detect(struct i2c_client *client,
+ struct i2c_board_info *info)
+{
+ struct i2c_adapter *adapter = client->adapter;
+ const char *type_name;
+ int man_id, dev_id;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ return -ENODEV;
+
+ /* Check for unsupported part */
+ man_id = i2c_smbus_read_byte_data(client, MAX1668_REG_MAN_ID);
+ if (man_id != MAN_ID_MAXIM)
+ return -ENODEV;
+
+ dev_id = i2c_smbus_read_byte_data(client, MAX1668_REG_DEV_ID);
+ if (dev_id < 0)
+ return -ENODEV;
+
+ type_name = NULL;
+ if (dev_id == DEV_ID_MAX1668)
+ type_name = "max1668";
+ else if (dev_id == DEV_ID_MAX1805)
+ type_name = "max1805";
+ else if (dev_id == DEV_ID_MAX1989)
+ type_name = "max1989";
+
+ if (!type_name)
+ return -ENODEV;
+
+ strlcpy(info->type, type_name, I2C_NAME_SIZE);
+
+ return 0;
+}
+
+static int max1668_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct i2c_adapter *adapter = client->adapter;
+ struct device *dev = &client->dev;
+ struct device *hwmon_dev;
+ struct max1668_data *data;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ return -ENODEV;
+
+ data = devm_kzalloc(dev, sizeof(struct max1668_data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->client = client;
+ data->type = id->driver_data;
+ mutex_init(&data->update_lock);
+
+ /* sysfs hooks */
+ data->groups[0] = &max1668_group_common;
+ if (data->type == max1668 || data->type == max1989)
+ data->groups[1] = &max1668_group_unique;
+
+ hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
+ data, data->groups);
+ return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+static const struct i2c_device_id max1668_id[] = {
+ { "max1668", max1668 },
+ { "max1805", max1805 },
+ { "max1989", max1989 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, max1668_id);
+
+/* This is the driver that will be inserted */
+static struct i2c_driver max1668_driver = {
+ .class = I2C_CLASS_HWMON,
+ .driver = {
+ .name = "max1668",
+ },
+ .probe = max1668_probe,
+ .id_table = max1668_id,
+ .detect = max1668_detect,
+ .address_list = max1668_addr_list,
+};
+
+module_i2c_driver(max1668_driver);
+
+MODULE_AUTHOR("David George <david.george@ska.ac.za>");
+MODULE_DESCRIPTION("MAX1668 remote temperature sensor driver");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff