diff options
Diffstat (limited to 'drivers/hwmon/max1668.c')
| -rw-r--r-- | drivers/hwmon/max1668.c | 480 |
1 files changed, 480 insertions, 0 deletions
diff --git a/drivers/hwmon/max1668.c b/drivers/hwmon/max1668.c new file mode 100644 index 00000000000..ddefb64b6ea --- /dev/null +++ b/drivers/hwmon/max1668.c @@ -0,0 +1,480 @@ +/* + 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 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 int 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 device *hwmon_dev; + 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 i2c_client *client = to_i2c_client(dev); + struct max1668_data *data = i2c_get_clientdata(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 &= 0x00ff; + data->alarms |= ((u8) (val & 0x60)) << 8; + + val = i2c_smbus_read_byte_data(client, MAX1668_REG_STAT2); + if (unlikely(val < 0)) { + ret = ERR_PTR(val); + goto abort; + } + data->alarms &= 0xff00; + data->alarms |= ((u8) 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 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 i2c_client *client = to_i2c_client(dev); + struct max1668_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); + data->temp_max[index] = SENSORS_LIMIT(temp/1000, -128, 127); + if (i2c_smbus_write_byte_data(client, + MAX1668_REG_LIMH_WR(index), + data->temp_max[index])) + count = -EIO; + 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 i2c_client *client = to_i2c_client(dev); + struct max1668_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); + data->temp_min[index] = SENSORS_LIMIT(temp/1000, -128, 127); + if (i2c_smbus_write_byte_data(client, + MAX1668_REG_LIML_WR(index), + data->temp_max[index])) + count = -EIO; + 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); + +/* 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, + 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, + NULL +}; + +static mode_t max1668_attribute_mode(struct kobject *kobj, + struct attribute *attr, int index) +{ + int 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 max1668_data *data; + int err; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) + return -ENODEV; + + data = kzalloc(sizeof(struct max1668_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + i2c_set_clientdata(client, data); + data->type = id->driver_data; + mutex_init(&data->update_lock); + + /* Register sysfs hooks */ + err = sysfs_create_group(&client->dev.kobj, &max1668_group_common); + if (err) + goto error_free; + + if (data->type == max1668 || data->type == max1989) { + err = sysfs_create_group(&client->dev.kobj, + &max1668_group_unique); + if (err) + goto error_sysrem0; + } + + data->hwmon_dev = hwmon_device_register(&client->dev); + if (IS_ERR(data->hwmon_dev)) { + err = PTR_ERR(data->hwmon_dev); + goto error_sysrem1; + } + + return 0; + +error_sysrem1: + if (data->type == max1668 || data->type == max1989) + sysfs_remove_group(&client->dev.kobj, &max1668_group_unique); +error_sysrem0: + sysfs_remove_group(&client->dev.kobj, &max1668_group_common); +error_free: + kfree(data); + return err; +} + +static int max1668_remove(struct i2c_client *client) +{ + struct max1668_data *data = i2c_get_clientdata(client); + + hwmon_device_unregister(data->hwmon_dev); + if (data->type == max1668 || data->type == max1989) + sysfs_remove_group(&client->dev.kobj, &max1668_group_unique); + + sysfs_remove_group(&client->dev.kobj, &max1668_group_common); + + kfree(data); + return 0; +} + +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, + .remove = max1668_remove, + .id_table = max1668_id, + .detect = max1668_detect, + .address_list = max1668_addr_list, +}; + +static int __init sensors_max1668_init(void) +{ + return i2c_add_driver(&max1668_driver); +} + +static void __exit sensors_max1668_exit(void) +{ + i2c_del_driver(&max1668_driver); +} + +MODULE_AUTHOR("David George <david.george@ska.ac.za>"); +MODULE_DESCRIPTION("MAX1668 remote temperature sensor driver"); +MODULE_LICENSE("GPL"); + +module_init(sensors_max1668_init) +module_exit(sensors_max1668_exit) |