diff options
Diffstat (limited to 'drivers/i2c/chips/lm83.c')
| -rw-r--r-- | drivers/i2c/chips/lm83.c | 408 |
1 files changed, 0 insertions, 408 deletions
diff --git a/drivers/i2c/chips/lm83.c b/drivers/i2c/chips/lm83.c deleted file mode 100644 index a49008b444c8..000000000000 --- a/drivers/i2c/chips/lm83.c +++ /dev/null @@ -1,408 +0,0 @@ -/* - * 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); |