diff options
Diffstat (limited to 'drivers/hwmon/adm1021.c')
| -rw-r--r-- | drivers/hwmon/adm1021.c | 506 |
1 files changed, 506 insertions, 0 deletions
diff --git a/drivers/hwmon/adm1021.c b/drivers/hwmon/adm1021.c new file mode 100644 index 000000000..1fdcc3e70 --- /dev/null +++ b/drivers/hwmon/adm1021.c @@ -0,0 +1,506 @@ +/* + * adm1021.c - Part of lm_sensors, Linux kernel modules for hardware + * monitoring + * Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and + * Philip Edelbrock <phil@netroedge.com> + * + * 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 normal_i2c[] = { + 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END }; + +enum chips { + adm1021, adm1023, max1617, max1617a, thmc10, lm84, gl523sm, mc1066 }; + +/* adm1021 constants specified below */ + +/* The adm1021 registers */ +/* Read-only */ +/* For nr in 0-1 */ +#define ADM1021_REG_TEMP(nr) (nr) +#define ADM1021_REG_STATUS 0x02 +/* 0x41 = AD, 0x49 = TI, 0x4D = Maxim, 0x23 = Genesys , 0x54 = Onsemi */ +#define ADM1021_REG_MAN_ID 0xFE +/* ADM1021 = 0x0X, ADM1023 = 0x3X */ +#define ADM1021_REG_DEV_ID 0xFF +/* These use different addresses for reading/writing */ +#define ADM1021_REG_CONFIG_R 0x03 +#define ADM1021_REG_CONFIG_W 0x09 +#define ADM1021_REG_CONV_RATE_R 0x04 +#define ADM1021_REG_CONV_RATE_W 0x0A +/* These are for the ADM1023's additional precision on the remote temp sensor */ +#define ADM1023_REG_REM_TEMP_PREC 0x10 +#define ADM1023_REG_REM_OFFSET 0x11 +#define ADM1023_REG_REM_OFFSET_PREC 0x12 +#define ADM1023_REG_REM_TOS_PREC 0x13 +#define ADM1023_REG_REM_THYST_PREC 0x14 +/* limits */ +/* For nr in 0-1 */ +#define ADM1021_REG_TOS_R(nr) (0x05 + 2 * (nr)) +#define ADM1021_REG_TOS_W(nr) (0x0B + 2 * (nr)) +#define ADM1021_REG_THYST_R(nr) (0x06 + 2 * (nr)) +#define ADM1021_REG_THYST_W(nr) (0x0C + 2 * (nr)) +/* write-only */ +#define ADM1021_REG_ONESHOT 0x0F + +/* Initial values */ + +/* + * Note: Even though I left the low and high limits named os and hyst, + * they don't quite work like a thermostat the way the LM75 does. I.e., + * a lower temp than THYST actually triggers an alarm instead of + * clearing it. Weird, ey? --Phil + */ + +/* Each client has this additional data */ +struct adm1021_data { + struct i2c_client *client; + enum chips type; + + const struct attribute_group *groups[3]; + + struct mutex update_lock; + char valid; /* !=0 if following fields are valid */ + char low_power; /* !=0 if device in low power mode */ + unsigned long last_updated; /* In jiffies */ + + int temp_max[2]; /* Register values */ + int temp_min[2]; + int temp[2]; + u8 alarms; + /* Special values for ADM1023 only */ + u8 remote_temp_offset; + u8 remote_temp_offset_prec; +}; + +/* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */ +static bool read_only; + +static struct adm1021_data *adm1021_update_device(struct device *dev) +{ + struct adm1021_data *data = dev_get_drvdata(dev); + struct i2c_client *client = data->client; + + mutex_lock(&data->update_lock); + + if (time_after(jiffies, data->last_updated + HZ + HZ / 2) + || !data->valid) { + int i; + + dev_dbg(dev, "Starting adm1021 update\n"); + + for (i = 0; i < 2; i++) { + data->temp[i] = 1000 * + (s8) i2c_smbus_read_byte_data( + client, ADM1021_REG_TEMP(i)); + data->temp_max[i] = 1000 * + (s8) i2c_smbus_read_byte_data( + client, ADM1021_REG_TOS_R(i)); + if (data->type != lm84) { + data->temp_min[i] = 1000 * + (s8) i2c_smbus_read_byte_data(client, + ADM1021_REG_THYST_R(i)); + } + } + data->alarms = i2c_smbus_read_byte_data(client, + ADM1021_REG_STATUS) & 0x7c; + if (data->type == adm1023) { + /* + * The ADM1023 provides 3 extra bits of precision for + * the remote sensor in extra registers. + */ + data->temp[1] += 125 * (i2c_smbus_read_byte_data( + client, ADM1023_REG_REM_TEMP_PREC) >> 5); + data->temp_max[1] += 125 * (i2c_smbus_read_byte_data( + client, ADM1023_REG_REM_TOS_PREC) >> 5); + data->temp_min[1] += 125 * (i2c_smbus_read_byte_data( + client, ADM1023_REG_REM_THYST_PREC) >> 5); + data->remote_temp_offset = + i2c_smbus_read_byte_data(client, + ADM1023_REG_REM_OFFSET); + data->remote_temp_offset_prec = + i2c_smbus_read_byte_data(client, + ADM1023_REG_REM_OFFSET_PREC); + } + data->last_updated = jiffies; + data->valid = 1; + } + + mutex_unlock(&data->update_lock); + + return data; +} + +static ssize_t show_temp(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + int index = to_sensor_dev_attr(devattr)->index; + struct adm1021_data *data = adm1021_update_device(dev); + + return sprintf(buf, "%d\n", data->temp[index]); +} + +static ssize_t show_temp_max(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + int index = to_sensor_dev_attr(devattr)->index; + struct adm1021_data *data = adm1021_update_device(dev); + + return sprintf(buf, "%d\n", data->temp_max[index]); +} + +static ssize_t show_temp_min(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + int index = to_sensor_dev_attr(devattr)->index; + struct adm1021_data *data = adm1021_update_device(dev); + + return sprintf(buf, "%d\n", data->temp_min[index]); +} + +static ssize_t show_alarm(struct device *dev, struct device_attribute *attr, + char *buf) +{ + int index = to_sensor_dev_attr(attr)->index; + struct adm1021_data *data = adm1021_update_device(dev); + return sprintf(buf, "%u\n", (data->alarms >> index) & 1); +} + +static ssize_t show_alarms(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct adm1021_data *data = adm1021_update_device(dev); + return sprintf(buf, "%u\n", data->alarms); +} + +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 adm1021_data *data = dev_get_drvdata(dev); + struct i2c_client *client = data->client; + long temp; + int reg_val, err; + + err = kstrtol(buf, 10, &temp); + if (err) + return err; + temp /= 1000; + + mutex_lock(&data->update_lock); + reg_val = clamp_val(temp, -128, 127); + data->temp_max[index] = reg_val * 1000; + if (!read_only) + i2c_smbus_write_byte_data(client, ADM1021_REG_TOS_W(index), + reg_val); + 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 adm1021_data *data = dev_get_drvdata(dev); + struct i2c_client *client = data->client; + long temp; + int reg_val, err; + + err = kstrtol(buf, 10, &temp); + if (err) + return err; + temp /= 1000; + + mutex_lock(&data->update_lock); + reg_val = clamp_val(temp, -128, 127); + data->temp_min[index] = reg_val * 1000; + if (!read_only) + i2c_smbus_write_byte_data(client, ADM1021_REG_THYST_W(index), + reg_val); + mutex_unlock(&data->update_lock); + + return count; +} + +static ssize_t show_low_power(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct adm1021_data *data = adm1021_update_device(dev); + return sprintf(buf, "%d\n", data->low_power); +} + +static ssize_t set_low_power(struct device *dev, + struct device_attribute *devattr, + const char *buf, size_t count) +{ + struct adm1021_data *data = dev_get_drvdata(dev); + struct i2c_client *client = data->client; + char low_power; + unsigned long val; + int err; + + err = kstrtoul(buf, 10, &val); + if (err) + return err; + low_power = val != 0; + + mutex_lock(&data->update_lock); + if (low_power != data->low_power) { + int config = i2c_smbus_read_byte_data( + client, ADM1021_REG_CONFIG_R); + data->low_power = low_power; + i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W, + (config & 0xBF) | (low_power << 6)); + } + 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_IWUSR | S_IRUGO, show_temp_max, + set_temp_max, 0); +static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | 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_IWUSR | S_IRUGO, show_temp_max, + set_temp_max, 1); +static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_min, + set_temp_min, 1); +static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6); +static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5); +static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4); +static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3); +static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2); + +static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); +static DEVICE_ATTR(low_power, S_IWUSR | S_IRUGO, show_low_power, set_low_power); + +static struct attribute *adm1021_attributes[] = { + &sensor_dev_attr_temp1_max.dev_attr.attr, + &sensor_dev_attr_temp1_input.dev_attr.attr, + &sensor_dev_attr_temp2_max.dev_attr.attr, + &sensor_dev_attr_temp2_input.dev_attr.attr, + &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, + &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, + &sensor_dev_attr_temp2_fault.dev_attr.attr, + &dev_attr_alarms.attr, + &dev_attr_low_power.attr, + NULL +}; + +static const struct attribute_group adm1021_group = { + .attrs = adm1021_attributes, +}; + +static struct attribute *adm1021_min_attributes[] = { + &sensor_dev_attr_temp1_min.dev_attr.attr, + &sensor_dev_attr_temp2_min.dev_attr.attr, + &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, + &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, + NULL +}; + +static const struct attribute_group adm1021_min_group = { + .attrs = adm1021_min_attributes, +}; + +/* Return 0 if detection is successful, -ENODEV otherwise */ +static int adm1021_detect(struct i2c_client *client, + struct i2c_board_info *info) +{ + struct i2c_adapter *adapter = client->adapter; + const char *type_name; + int conv_rate, status, config, man_id, dev_id; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { + pr_debug("detect failed, smbus byte data not supported!\n"); + return -ENODEV; + } + + status = i2c_smbus_read_byte_data(client, ADM1021_REG_STATUS); + conv_rate = i2c_smbus_read_byte_data(client, + ADM1021_REG_CONV_RATE_R); + config = i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R); + + /* Check unused bits */ + if ((status & 0x03) || (config & 0x3F) || (conv_rate & 0xF8)) { + pr_debug("detect failed, chip not detected!\n"); + return -ENODEV; + } + + /* Determine the chip type. */ + man_id = i2c_smbus_read_byte_data(client, ADM1021_REG_MAN_ID); + dev_id = i2c_smbus_read_byte_data(client, ADM1021_REG_DEV_ID); + + if (man_id < 0 || dev_id < 0) + return -ENODEV; + + if (man_id == 0x4d && dev_id == 0x01) + type_name = "max1617a"; + else if (man_id == 0x41) { + if ((dev_id & 0xF0) == 0x30) + type_name = "adm1023"; + else if ((dev_id & 0xF0) == 0x00) + type_name = "adm1021"; + else + return -ENODEV; + } else if (man_id == 0x49) + type_name = "thmc10"; + else if (man_id == 0x23) + type_name = "gl523sm"; + else if (man_id == 0x54) + type_name = "mc1066"; + else { + int lte, rte, lhi, rhi, llo, rlo; + + /* extra checks for LM84 and MAX1617 to avoid misdetections */ + + llo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(0)); + rlo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(1)); + + /* fail if any of the additional register reads failed */ + if (llo < 0 || rlo < 0) + return -ENODEV; + + lte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(0)); + rte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(1)); + lhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(0)); + rhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(1)); + + /* + * Fail for negative temperatures and negative high limits. + * This check also catches read errors on the tested registers. + */ + if ((s8)lte < 0 || (s8)rte < 0 || (s8)lhi < 0 || (s8)rhi < 0) + return -ENODEV; + + /* fail if all registers hold the same value */ + if (lte == rte && lte == lhi && lte == rhi && lte == llo + && lte == rlo) + return -ENODEV; + + /* + * LM84 Mfr ID is in a different place, + * and it has more unused bits. + */ + if (conv_rate == 0x00 + && (config & 0x7F) == 0x00 + && (status & 0xAB) == 0x00) { + type_name = "lm84"; + } else { + /* fail if low limits are larger than high limits */ + if ((s8)llo > lhi || (s8)rlo > rhi) + return -ENODEV; + type_name = "max1617"; + } + } + + pr_debug("Detected chip %s at adapter %d, address 0x%02x.\n", + type_name, i2c_adapter_id(adapter), client->addr); + strlcpy(info->type, type_name, I2C_NAME_SIZE); + + return 0; +} + +static void adm1021_init_client(struct i2c_client *client) +{ + /* Enable ADC and disable suspend mode */ + i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W, + i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R) & 0xBF); + /* Set Conversion rate to 1/sec (this can be tinkered with) */ + i2c_smbus_write_byte_data(client, ADM1021_REG_CONV_RATE_W, 0x04); +} + +static int adm1021_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct device *dev = &client->dev; + struct adm1021_data *data; + struct device *hwmon_dev; + + data = devm_kzalloc(dev, sizeof(struct adm1021_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->client = client; + data->type = id->driver_data; + mutex_init(&data->update_lock); + + /* Initialize the ADM1021 chip */ + if (data->type != lm84 && !read_only) + adm1021_init_client(client); + + data->groups[0] = &adm1021_group; + if (data->type != lm84) + data->groups[1] = &adm1021_min_group; + + 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 adm1021_id[] = { + { "adm1021", adm1021 }, + { "adm1023", adm1023 }, + { "max1617", max1617 }, + { "max1617a", max1617a }, + { "thmc10", thmc10 }, + { "lm84", lm84 }, + { "gl523sm", gl523sm }, + { "mc1066", mc1066 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, adm1021_id); + +static struct i2c_driver adm1021_driver = { + .class = I2C_CLASS_HWMON, + .driver = { + .name = "adm1021", + }, + .probe = adm1021_probe, + .id_table = adm1021_id, + .detect = adm1021_detect, + .address_list = normal_i2c, +}; + +module_i2c_driver(adm1021_driver); + +MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and " + "Philip Edelbrock <phil@netroedge.com>"); +MODULE_DESCRIPTION("adm1021 driver"); +MODULE_LICENSE("GPL"); + +module_param(read_only, bool, 0); +MODULE_PARM_DESC(read_only, "Don't set any values, read only mode"); |