diff options
Diffstat (limited to 'drivers/i2c/chips/lm75.c')
| -rw-r--r-- | drivers/i2c/chips/lm75.c | 296 |
1 files changed, 0 insertions, 296 deletions
diff --git a/drivers/i2c/chips/lm75.c b/drivers/i2c/chips/lm75.c deleted file mode 100644 index 5be164e..0000000 --- a/drivers/i2c/chips/lm75.c +++ /dev/null @@ -1,296 +0,0 @@ -/* - lm75.c - Part of lm_sensors, Linux kernel modules for hardware - monitoring - Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> - - 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 "lm75.h" - - -/* Addresses to scan */ -static unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c, - 0x4d, 0x4e, 0x4f, I2C_CLIENT_END }; -static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END }; - -/* Insmod parameters */ -SENSORS_INSMOD_1(lm75); - -/* Many LM75 constants specified below */ - -/* The LM75 registers */ -#define LM75_REG_TEMP 0x00 -#define LM75_REG_CONF 0x01 -#define LM75_REG_TEMP_HYST 0x02 -#define LM75_REG_TEMP_OS 0x03 - -/* Each client has this additional data */ -struct lm75_data { - struct i2c_client client; - struct semaphore update_lock; - char valid; /* !=0 if following fields are valid */ - unsigned long last_updated; /* In jiffies */ - u16 temp_input; /* Register values */ - u16 temp_max; - u16 temp_hyst; -}; - -static int lm75_attach_adapter(struct i2c_adapter *adapter); -static int lm75_detect(struct i2c_adapter *adapter, int address, int kind); -static void lm75_init_client(struct i2c_client *client); -static int lm75_detach_client(struct i2c_client *client); -static int lm75_read_value(struct i2c_client *client, u8 reg); -static int lm75_write_value(struct i2c_client *client, u8 reg, u16 value); -static struct lm75_data *lm75_update_device(struct device *dev); - - -/* This is the driver that will be inserted */ -static struct i2c_driver lm75_driver = { - .owner = THIS_MODULE, - .name = "lm75", - .id = I2C_DRIVERID_LM75, - .flags = I2C_DF_NOTIFY, - .attach_adapter = lm75_attach_adapter, - .detach_client = lm75_detach_client, -}; - -#define show(value) \ -static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \ -{ \ - struct lm75_data *data = lm75_update_device(dev); \ - return sprintf(buf, "%d\n", LM75_TEMP_FROM_REG(data->value)); \ -} -show(temp_max); -show(temp_hyst); -show(temp_input); - -#define set(value, reg) \ -static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \ -{ \ - struct i2c_client *client = to_i2c_client(dev); \ - struct lm75_data *data = i2c_get_clientdata(client); \ - int temp = simple_strtoul(buf, NULL, 10); \ - \ - down(&data->update_lock); \ - data->value = LM75_TEMP_TO_REG(temp); \ - lm75_write_value(client, reg, data->value); \ - up(&data->update_lock); \ - return count; \ -} -set(temp_max, LM75_REG_TEMP_OS); -set(temp_hyst, LM75_REG_TEMP_HYST); - -static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, set_temp_max); -static DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_temp_hyst, set_temp_hyst); -static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL); - -static int lm75_attach_adapter(struct i2c_adapter *adapter) -{ - if (!(adapter->class & I2C_CLASS_HWMON)) - return 0; - return i2c_detect(adapter, &addr_data, lm75_detect); -} - -/* This function is called by i2c_detect */ -static int lm75_detect(struct i2c_adapter *adapter, int address, int kind) -{ - int i; - struct i2c_client *new_client; - struct lm75_data *data; - int err = 0; - const char *name = ""; - - /* Make sure we aren't probing the ISA bus!! This is just a safety check - at this moment; i2c_detect really won't call us. */ -#ifdef DEBUG - if (i2c_is_isa_adapter(adapter)) { - dev_dbg(&adapter->dev, - "lm75_detect called for an ISA bus adapter?!?\n"); - goto exit; - } -#endif - - if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | - I2C_FUNC_SMBUS_WORD_DATA)) - goto exit; - - /* 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 lm75_{read,write}_value. */ - if (!(data = kmalloc(sizeof(struct lm75_data), GFP_KERNEL))) { - err = -ENOMEM; - goto exit; - } - memset(data, 0, sizeof(struct lm75_data)); - - new_client = &data->client; - i2c_set_clientdata(new_client, data); - new_client->addr = address; - new_client->adapter = adapter; - new_client->driver = &lm75_driver; - new_client->flags = 0; - - /* Now, we do the remaining detection. There is no identification- - dedicated register so we have to rely on several tricks: - unused bits, registers cycling over 8-address boundaries, - addresses 0x04-0x07 returning the last read value. - The cycling+unused addresses combination is not tested, - since it would significantly slow the detection down and would - hardly add any value. */ - if (kind < 0) { - int cur, conf, hyst, os; - - /* Unused addresses */ - cur = i2c_smbus_read_word_data(new_client, 0); - conf = i2c_smbus_read_byte_data(new_client, 1); - hyst = i2c_smbus_read_word_data(new_client, 2); - if (i2c_smbus_read_word_data(new_client, 4) != hyst - || i2c_smbus_read_word_data(new_client, 5) != hyst - || i2c_smbus_read_word_data(new_client, 6) != hyst - || i2c_smbus_read_word_data(new_client, 7) != hyst) - goto exit_free; - os = i2c_smbus_read_word_data(new_client, 3); - if (i2c_smbus_read_word_data(new_client, 4) != os - || i2c_smbus_read_word_data(new_client, 5) != os - || i2c_smbus_read_word_data(new_client, 6) != os - || i2c_smbus_read_word_data(new_client, 7) != os) - goto exit_free; - - /* Unused bits */ - if (conf & 0xe0) - goto exit_free; - - /* Addresses cycling */ - for (i = 8; i < 0xff; i += 8) - if (i2c_smbus_read_byte_data(new_client, i + 1) != conf - || i2c_smbus_read_word_data(new_client, i + 2) != hyst - || i2c_smbus_read_word_data(new_client, i + 3) != os) - goto exit_free; - } - - /* Determine the chip type - only one kind supported! */ - if (kind <= 0) - kind = lm75; - - if (kind == lm75) { - name = "lm75"; - } - - /* Fill in the remaining client fields and put it into the global list */ - 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 LM75 chip */ - lm75_init_client(new_client); - - /* Register sysfs hooks */ - device_create_file(&new_client->dev, &dev_attr_temp1_max); - device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst); - device_create_file(&new_client->dev, &dev_attr_temp1_input); - - return 0; - -exit_free: - kfree(data); -exit: - return err; -} - -static int lm75_detach_client(struct i2c_client *client) -{ - i2c_detach_client(client); - kfree(i2c_get_clientdata(client)); - return 0; -} - -/* All registers are word-sized, except for the configuration register. - LM75 uses a high-byte first convention, which is exactly opposite to - the usual practice. */ -static int lm75_read_value(struct i2c_client *client, u8 reg) -{ - if (reg == LM75_REG_CONF) - return i2c_smbus_read_byte_data(client, reg); - else - return swab16(i2c_smbus_read_word_data(client, reg)); -} - -/* All registers are word-sized, except for the configuration register. - LM75 uses a high-byte first convention, which is exactly opposite to - the usual practice. */ -static int lm75_write_value(struct i2c_client *client, u8 reg, u16 value) -{ - if (reg == LM75_REG_CONF) - return i2c_smbus_write_byte_data(client, reg, value); - else - return i2c_smbus_write_word_data(client, reg, swab16(value)); -} - -static void lm75_init_client(struct i2c_client *client) -{ - /* Initialize the LM75 chip */ - lm75_write_value(client, LM75_REG_CONF, 0); -} - -static struct lm75_data *lm75_update_device(struct device *dev) -{ - struct i2c_client *client = to_i2c_client(dev); - struct lm75_data *data = i2c_get_clientdata(client); - - down(&data->update_lock); - - if (time_after(jiffies, data->last_updated + HZ + HZ / 2) - || !data->valid) { - dev_dbg(&client->dev, "Starting lm75 update\n"); - - data->temp_input = lm75_read_value(client, LM75_REG_TEMP); - data->temp_max = lm75_read_value(client, LM75_REG_TEMP_OS); - data->temp_hyst = lm75_read_value(client, LM75_REG_TEMP_HYST); - data->last_updated = jiffies; - data->valid = 1; - } - - up(&data->update_lock); - - return data; -} - -static int __init sensors_lm75_init(void) -{ - return i2c_add_driver(&lm75_driver); -} - -static void __exit sensors_lm75_exit(void) -{ - i2c_del_driver(&lm75_driver); -} - -MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>"); -MODULE_DESCRIPTION("LM75 driver"); -MODULE_LICENSE("GPL"); - -module_init(sensors_lm75_init); -module_exit(sensors_lm75_exit); |