/* 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 unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END }; /* Insmod parameters */ I2C_CLIENT_INSMOD_8(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; 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 */ s8 temp_max[2]; /* Register values */ s8 temp_min[2]; s8 temp[2]; u8 alarms; /* Special values for ADM1023 only */ u8 remote_temp_prec; u8 remote_temp_os_prec; u8 remote_temp_hyst_prec; u8 remote_temp_offset; u8 remote_temp_offset_prec; }; static int adm1021_attach_adapter(struct i2c_adapter *adapter); static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind); static void adm1021_init_client(struct i2c_client *client); static int adm1021_detach_client(struct i2c_client *client); static struct adm1021_data *adm1021_update_device(struct device *dev); /* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */ static int read_only; /* This is the driver that will be inserted */ static struct i2c_driver adm1021_driver = { .driver = { .name = "adm1021", }, .id = I2C_DRIVERID_ADM1021, .attach_adapter = adm1021_attach_adapter, .detach_client = adm1021_detach_client, }; 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", 1000 * 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", 1000 * 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", 1000 * 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 i2c_client *client = to_i2c_client(dev); struct adm1021_data *data = i2c_get_clientdata(client); long temp = simple_strtol(buf, NULL, 10) / 1000; mutex_lock(&data->update_lock); data->temp_max[index] = SENSORS_LIMIT(temp, -128, 127); if (!read_only) i2c_smbus_write_byte_data(client, ADM1021_REG_TOS_W(index), data->temp_max[index]); 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 adm1021_data *data = i2c_get_clientdata(client); long temp = simple_strtol(buf, NULL, 10) / 1000; mutex_lock(&data->update_lock); data->temp_min[index] = SENSORS_LIMIT(temp, -128, 127); if (!read_only) i2c_smbus_write_byte_data(client, ADM1021_REG_THYST_W(index), data->temp_min[index]); 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 int adm1021_attach_adapter(struct i2c_adapter *adapter) { if (!(adapter->class & I2C_CLASS_HWMON)) return 0; return i2c_probe(adapter, &addr_data, adm1021_detect); } static struct attribute *adm1021_attributes[] = { &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_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_temp2_fault.dev_attr.attr, &dev_attr_alarms.attr, NULL }; static const struct attribute_group adm1021_group = { .attrs = adm1021_attributes, }; static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind) { int i; struct i2c_client *client; struct adm1021_data *data; int err = 0; const char *type_name = ""; int conv_rate, status, config; if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { pr_debug("adm1021: detect failed, " "smbus byte data not supported!\n"); goto error0; } /* OK. For now, we presume we have a valid client. We now create the client structure, even though we cannot fill it completely yet. But it allows us to access adm1021 register values. */ if (!(data = kzalloc(sizeof(struct adm1021_data), GFP_KERNEL))) { pr_debug("adm1021: detect failed, kzalloc failed!\n"); err = -ENOMEM; goto error0; } client = &data->client; i2c_set_clientdata(client, data); client->addr = address; client->adapter = adapter; client->driver = &adm1021_driver; 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); /* Now, we do the remaining detection. */ if (kind < 0) { if ((status & 0x03) != 0x00 || (config & 0x3F) != 0x00 || (conv_rate & 0xF8) != 0x00) { pr_debug("adm1021: detect failed, " "chip not detected!\n"); err = -ENODEV; goto error1; } } /* Determine the chip type. */ if (kind <= 0) { i = i2c_smbus_read_byte_data(client, ADM1021_REG_MAN_ID); if (i == 0x41) if ((i2c_smbus_read_byte_data(client, ADM1021_REG_DEV_ID) & 0xF0) == 0x30) kind = adm1023; else kind = adm1021; else if (i == 0x49) kind = thmc10; else if (i == 0x23) kind = gl523sm; else if ((i == 0x4d) && (i2c_smbus_read_byte_data(client, ADM1021_REG_DEV_ID) == 0x01)) kind = max1617a; else if (i == 0x54) kind = mc1066; /* LM84 Mfr ID in a different place, and it has more unused bits */ else if (conv_rate == 0x00 && (kind == 0 /* skip extra detection */ || ((config & 0x7F) == 0x00 && (status & 0xAB) == 0x00))) kind = lm84; else kind = max1617; } if (kind == max1617) { type_name = "max1617"; } else if (kind == max1617a) { type_name = "max1617a"; } else if (kind == adm1021) { type_name = "adm1021"; } else if (kind == adm1023) { type_name = "adm1023"; } else if (kind == thmc10) { type_name = "thmc10"; } else if (kind == lm84) { type_name = "lm84"; } else if (kind == gl523sm) { type_name = "gl523sm"; } else if (kind == mc1066) { type_name = "mc1066"; } pr_debug("adm1021: Detected chip %s at adapter %d, address 0x%02x.\n", type_name, i2c_adapter_id(adapter), address); /* Fill in the remaining client fields */ strlcpy(client->name, type_name, I2C_NAME_SIZE); data->type = kind; mutex_init(&data->update_lock); /* Tell the I2C layer a new client has arrived */ if ((err = i2c_attach_client(client))) goto error1; /* Initialize the ADM1021 chip */ if (kind != lm84 && !read_only) adm1021_init_client(client); /* Register sysfs hooks */ if ((err = sysfs_create_group(&client->dev.kobj, &adm1021_group))) goto error2; data->hwmon_dev = hwmon_device_register(&client->dev); if (IS_ERR(data->hwmon_dev)) { err = PTR_ERR(data->hwmon_dev); goto error3; } return 0; error3: sysfs_remove_group(&client->dev.kobj, &adm1021_group); error2: i2c_detach_client(client); error1: kfree(data); error0: return err; } 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_detach_client(struct i2c_client *client) { struct adm1021_data *data = i2c_get_clientdata(client); int err; hwmon_device_unregister(data->hwmon_dev); sysfs_remove_group(&client->dev.kobj, &adm1021_group); if ((err = i2c_detach_client(client))) return err; kfree(data); return 0; } static struct adm1021_data *adm1021_update_device(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct adm1021_data *data = i2c_get_clientdata(client); mutex_lock(&data->update_lock); if (time_after(jiffies, data->last_updated + HZ + HZ / 2) || !data->valid) { int i; dev_dbg(&client->dev, "Starting adm1021 update\n"); for (i = 0; i < 2; i++) { data->temp[i] = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(i)); data->temp_max[i] = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(i)); data->temp_min[i] = 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) { data->remote_temp_prec = i2c_smbus_read_byte_data(client, ADM1023_REG_REM_TEMP_PREC); data->remote_temp_os_prec = i2c_smbus_read_byte_data(client, ADM1023_REG_REM_TOS_PREC); data->remote_temp_hyst_prec = i2c_smbus_read_byte_data(client, ADM1023_REG_REM_THYST_PREC); 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 int __init sensors_adm1021_init(void) { return i2c_add_driver(&adm1021_driver); } static void __exit sensors_adm1021_exit(void) { i2c_del_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"); module_init(sensors_adm1021_init) module_exit(sensors_adm1021_exit)