diff options
Diffstat (limited to 'drivers/hwmon/lm83.c')
| -rw-r--r-- | drivers/hwmon/lm83.c | 408 |
1 files changed, 408 insertions, 0 deletions
diff --git a/drivers/hwmon/lm83.c b/drivers/hwmon/lm83.c new file mode 100644 index 00000000000..a49008b444c --- /dev/null +++ b/drivers/hwmon/lm83.c @@ -0,0 +1,408 @@ +/* + * lm83.c - Part of lm_sensors, Linux kernel modules for hardware + * monitoring + * Copyright (C) 2003-2005 Jean Delvare <khali@linux-fr.org> + * + * Heavily inspired from the lm78, lm75 and adm1021 drivers. The LM83 is + * a sensor chip made by National Semiconductor. It reports up to four + * temperatures (its own plus up to three external ones) with a 1 deg + * resolution and a 3-4 deg accuracy. Complete datasheet can be obtained + * from National's website at: + * http://www.national.com/pf/LM/LM83.html + * Since the datasheet omits to give the chip stepping code, I give it + * here: 0x03 (at register 0xff). + * + * 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/i2c-sensor.h> +#include <linux/hwmon-sysfs.h> + +/* + * Addresses to scan + * Address is selected using 2 three-level pins, resulting in 9 possible + * addresses. + */ + +static unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a, + 0x29, 0x2a, 0x2b, + 0x4c, 0x4d, 0x4e, + I2C_CLIENT_END }; +static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END }; + +/* + * Insmod parameters + */ + +SENSORS_INSMOD_1(lm83); + +/* + * The LM83 registers + * Manufacturer ID is 0x01 for National Semiconductor. + */ + +#define LM83_REG_R_MAN_ID 0xFE +#define LM83_REG_R_CHIP_ID 0xFF +#define LM83_REG_R_CONFIG 0x03 +#define LM83_REG_W_CONFIG 0x09 +#define LM83_REG_R_STATUS1 0x02 +#define LM83_REG_R_STATUS2 0x35 +#define LM83_REG_R_LOCAL_TEMP 0x00 +#define LM83_REG_R_LOCAL_HIGH 0x05 +#define LM83_REG_W_LOCAL_HIGH 0x0B +#define LM83_REG_R_REMOTE1_TEMP 0x30 +#define LM83_REG_R_REMOTE1_HIGH 0x38 +#define LM83_REG_W_REMOTE1_HIGH 0x50 +#define LM83_REG_R_REMOTE2_TEMP 0x01 +#define LM83_REG_R_REMOTE2_HIGH 0x07 +#define LM83_REG_W_REMOTE2_HIGH 0x0D +#define LM83_REG_R_REMOTE3_TEMP 0x31 +#define LM83_REG_R_REMOTE3_HIGH 0x3A +#define LM83_REG_W_REMOTE3_HIGH 0x52 +#define LM83_REG_R_TCRIT 0x42 +#define LM83_REG_W_TCRIT 0x5A + +/* + * Conversions and various macros + * The LM83 uses signed 8-bit values with LSB = 1 degree Celsius. + */ + +#define TEMP_FROM_REG(val) ((val) * 1000) +#define TEMP_TO_REG(val) ((val) <= -128000 ? -128 : \ + (val) >= 127000 ? 127 : \ + (val) < 0 ? ((val) - 500) / 1000 : \ + ((val) + 500) / 1000) + +static const u8 LM83_REG_R_TEMP[] = { + LM83_REG_R_LOCAL_TEMP, + LM83_REG_R_REMOTE1_TEMP, + LM83_REG_R_REMOTE2_TEMP, + LM83_REG_R_REMOTE3_TEMP, + LM83_REG_R_LOCAL_HIGH, + LM83_REG_R_REMOTE1_HIGH, + LM83_REG_R_REMOTE2_HIGH, + LM83_REG_R_REMOTE3_HIGH, + LM83_REG_R_TCRIT, +}; + +static const u8 LM83_REG_W_HIGH[] = { + LM83_REG_W_LOCAL_HIGH, + LM83_REG_W_REMOTE1_HIGH, + LM83_REG_W_REMOTE2_HIGH, + LM83_REG_W_REMOTE3_HIGH, + LM83_REG_W_TCRIT, +}; + +/* + * Functions declaration + */ + +static int lm83_attach_adapter(struct i2c_adapter *adapter); +static int lm83_detect(struct i2c_adapter *adapter, int address, int kind); +static int lm83_detach_client(struct i2c_client *client); +static struct lm83_data *lm83_update_device(struct device *dev); + +/* + * Driver data (common to all clients) + */ + +static struct i2c_driver lm83_driver = { + .owner = THIS_MODULE, + .name = "lm83", + .id = I2C_DRIVERID_LM83, + .flags = I2C_DF_NOTIFY, + .attach_adapter = lm83_attach_adapter, + .detach_client = lm83_detach_client, +}; + +/* + * Client data (each client gets its own) + */ + +struct lm83_data { + struct i2c_client client; + struct semaphore update_lock; + char valid; /* zero until following fields are valid */ + unsigned long last_updated; /* in jiffies */ + + /* registers values */ + s8 temp[9]; /* 0..3: input 1-4, + 4..7: high limit 1-4, + 8 : critical limit */ + u16 alarms; /* bitvector, combined */ +}; + +/* + * Sysfs stuff + */ + +static ssize_t show_temp(struct device *dev, struct device_attribute *devattr, + char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + struct lm83_data *data = lm83_update_device(dev); + return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index])); +} + +static ssize_t set_temp(struct device *dev, struct device_attribute *devattr, + const char *buf, size_t count) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + struct i2c_client *client = to_i2c_client(dev); + struct lm83_data *data = i2c_get_clientdata(client); + long val = simple_strtol(buf, NULL, 10); + int nr = attr->index; + + down(&data->update_lock); + data->temp[nr] = TEMP_TO_REG(val); + i2c_smbus_write_byte_data(client, LM83_REG_W_HIGH[nr - 4], + data->temp[nr]); + up(&data->update_lock); + return count; +} + +static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy, + char *buf) +{ + struct lm83_data *data = lm83_update_device(dev); + return sprintf(buf, "%d\n", data->alarms); +} + +static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); +static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1); +static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2); +static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3); +static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp, + set_temp, 4); +static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp, + set_temp, 5); +static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_temp, + set_temp, 6); +static SENSOR_DEVICE_ATTR(temp4_max, S_IWUSR | S_IRUGO, show_temp, + set_temp, 7); +static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL, 8); +static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp, NULL, 8); +static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR | S_IRUGO, show_temp, + set_temp, 8); +static SENSOR_DEVICE_ATTR(temp4_crit, S_IRUGO, show_temp, NULL, 8); +static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); + +/* + * Real code + */ + +static int lm83_attach_adapter(struct i2c_adapter *adapter) +{ + if (!(adapter->class & I2C_CLASS_HWMON)) + return 0; + return i2c_detect(adapter, &addr_data, lm83_detect); +} + +/* + * The following function does more than just detection. If detection + * succeeds, it also registers the new chip. + */ +static int lm83_detect(struct i2c_adapter *adapter, int address, int kind) +{ + struct i2c_client *new_client; + struct lm83_data *data; + int err = 0; + const char *name = ""; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) + goto exit; + + if (!(data = kmalloc(sizeof(struct lm83_data), GFP_KERNEL))) { + err = -ENOMEM; + goto exit; + } + memset(data, 0, sizeof(struct lm83_data)); + + /* The common I2C client data is placed right after the + * LM83-specific data. */ + new_client = &data->client; + i2c_set_clientdata(new_client, data); + new_client->addr = address; + new_client->adapter = adapter; + new_client->driver = &lm83_driver; + new_client->flags = 0; + + /* Now we do the detection and identification. A negative kind + * means that the driver was loaded with no force parameter + * (default), so we must both detect and identify the chip + * (actually there is only one possible kind of chip for now, LM83). + * A zero kind means that the driver was loaded with the force + * parameter, the detection step shall be skipped. A positive kind + * means that the driver was loaded with the force parameter and a + * given kind of chip is requested, so both the detection and the + * identification steps are skipped. */ + + /* Default to an LM83 if forced */ + if (kind == 0) + kind = lm83; + + if (kind < 0) { /* detection */ + if (((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS1) + & 0xA8) != 0x00) || + ((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS2) + & 0x48) != 0x00) || + ((i2c_smbus_read_byte_data(new_client, LM83_REG_R_CONFIG) + & 0x41) != 0x00)) { + dev_dbg(&adapter->dev, + "LM83 detection failed at 0x%02x.\n", address); + goto exit_free; + } + } + + if (kind <= 0) { /* identification */ + u8 man_id, chip_id; + + man_id = i2c_smbus_read_byte_data(new_client, + LM83_REG_R_MAN_ID); + chip_id = i2c_smbus_read_byte_data(new_client, + LM83_REG_R_CHIP_ID); + + if (man_id == 0x01) { /* National Semiconductor */ + if (chip_id == 0x03) { + kind = lm83; + } + } + + if (kind <= 0) { /* identification failed */ + dev_info(&adapter->dev, + "Unsupported chip (man_id=0x%02X, " + "chip_id=0x%02X).\n", man_id, chip_id); + goto exit_free; + } + } + + if (kind == lm83) { + name = "lm83"; + } + + /* We can fill in the remaining client fields */ + strlcpy(new_client->name, name, I2C_NAME_SIZE); + data->valid = 0; + init_MUTEX(&data->update_lock); + + /* Tell the I2C layer a new client has arrived */ + if ((err = i2c_attach_client(new_client))) + goto exit_free; + + /* + * Initialize the LM83 chip + * (Nothing to do for this one.) + */ + + /* Register sysfs hooks */ + device_create_file(&new_client->dev, + &sensor_dev_attr_temp1_input.dev_attr); + device_create_file(&new_client->dev, + &sensor_dev_attr_temp2_input.dev_attr); + device_create_file(&new_client->dev, + &sensor_dev_attr_temp3_input.dev_attr); + device_create_file(&new_client->dev, + &sensor_dev_attr_temp4_input.dev_attr); + device_create_file(&new_client->dev, + &sensor_dev_attr_temp1_max.dev_attr); + device_create_file(&new_client->dev, + &sensor_dev_attr_temp2_max.dev_attr); + device_create_file(&new_client->dev, + &sensor_dev_attr_temp3_max.dev_attr); + device_create_file(&new_client->dev, + &sensor_dev_attr_temp4_max.dev_attr); + device_create_file(&new_client->dev, + &sensor_dev_attr_temp1_crit.dev_attr); + device_create_file(&new_client->dev, + &sensor_dev_attr_temp2_crit.dev_attr); + device_create_file(&new_client->dev, + &sensor_dev_attr_temp3_crit.dev_attr); + device_create_file(&new_client->dev, + &sensor_dev_attr_temp4_crit.dev_attr); + device_create_file(&new_client->dev, &dev_attr_alarms); + + return 0; + +exit_free: + kfree(data); +exit: + return err; +} + +static int lm83_detach_client(struct i2c_client *client) +{ + int err; + + if ((err = i2c_detach_client(client))) { + dev_err(&client->dev, + "Client deregistration failed, client not detached.\n"); + return err; + } + + kfree(i2c_get_clientdata(client)); + return 0; +} + +static struct lm83_data *lm83_update_device(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct lm83_data *data = i2c_get_clientdata(client); + + down(&data->update_lock); + + if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) { + int nr; + + dev_dbg(&client->dev, "Updating lm83 data.\n"); + for (nr = 0; nr < 9; nr++) { + data->temp[nr] = + i2c_smbus_read_byte_data(client, + LM83_REG_R_TEMP[nr]); + } + data->alarms = + i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS1) + + (i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS2) + << 8); + + data->last_updated = jiffies; + data->valid = 1; + } + + up(&data->update_lock); + + return data; +} + +static int __init sensors_lm83_init(void) +{ + return i2c_add_driver(&lm83_driver); +} + +static void __exit sensors_lm83_exit(void) +{ + i2c_del_driver(&lm83_driver); +} + +MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>"); +MODULE_DESCRIPTION("LM83 driver"); +MODULE_LICENSE("GPL"); + +module_init(sensors_lm83_init); +module_exit(sensors_lm83_exit); |