1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
342 lines
10 KiB
C
342 lines
10 KiB
C
/*
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ds1621.c - Part of lm_sensors, Linux kernel modules for hardware
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monitoring
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Christian W. Zuckschwerdt <zany@triq.net> 2000-11-23
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based on lm75.c by Frodo Looijaard <frodol@dds.nl>
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Ported to Linux 2.6 by Aurelien Jarno <aurelien@aurel32.net> with
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the help of Jean Delvare <khali@linux-fr.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/jiffies.h>
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#include <linux/i2c.h>
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#include <linux/i2c-sensor.h>
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#include "lm75.h"
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/* Addresses to scan */
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static unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
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0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
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static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
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/* Insmod parameters */
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SENSORS_INSMOD_1(ds1621);
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static int polarity = -1;
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module_param(polarity, int, 0);
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MODULE_PARM_DESC(polarity, "Output's polarity: 0 = active high, 1 = active low");
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/* Many DS1621 constants specified below */
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/* Config register used for detection */
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/* 7 6 5 4 3 2 1 0 */
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/* |Done|THF |TLF |NVB | X | X |POL |1SHOT| */
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#define DS1621_REG_CONFIG_NVB 0x10
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#define DS1621_REG_CONFIG_POLARITY 0x02
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#define DS1621_REG_CONFIG_1SHOT 0x01
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#define DS1621_REG_CONFIG_DONE 0x80
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/* The DS1621 registers */
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#define DS1621_REG_TEMP 0xAA /* word, RO */
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#define DS1621_REG_TEMP_MIN 0xA1 /* word, RW */
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#define DS1621_REG_TEMP_MAX 0xA2 /* word, RW */
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#define DS1621_REG_CONF 0xAC /* byte, RW */
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#define DS1621_COM_START 0xEE /* no data */
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#define DS1621_COM_STOP 0x22 /* no data */
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/* The DS1621 configuration register */
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#define DS1621_ALARM_TEMP_HIGH 0x40
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#define DS1621_ALARM_TEMP_LOW 0x20
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/* Conversions. Rounding and limit checking is only done on the TO_REG
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variants. Note that you should be a bit careful with which arguments
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these macros are called: arguments may be evaluated more than once.
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Fixing this is just not worth it. */
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#define ALARMS_FROM_REG(val) ((val) & \
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(DS1621_ALARM_TEMP_HIGH | DS1621_ALARM_TEMP_LOW))
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/* Each client has this additional data */
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struct ds1621_data {
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struct i2c_client client;
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struct semaphore update_lock;
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char valid; /* !=0 if following fields are valid */
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unsigned long last_updated; /* In jiffies */
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u16 temp, temp_min, temp_max; /* Register values, word */
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u8 conf; /* Register encoding, combined */
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};
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static int ds1621_attach_adapter(struct i2c_adapter *adapter);
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static int ds1621_detect(struct i2c_adapter *adapter, int address,
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int kind);
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static void ds1621_init_client(struct i2c_client *client);
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static int ds1621_detach_client(struct i2c_client *client);
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static struct ds1621_data *ds1621_update_client(struct device *dev);
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/* This is the driver that will be inserted */
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static struct i2c_driver ds1621_driver = {
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.owner = THIS_MODULE,
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.name = "ds1621",
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.id = I2C_DRIVERID_DS1621,
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.flags = I2C_DF_NOTIFY,
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.attach_adapter = ds1621_attach_adapter,
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.detach_client = ds1621_detach_client,
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};
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/* All registers are word-sized, except for the configuration register.
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DS1621 uses a high-byte first convention, which is exactly opposite to
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the usual practice. */
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static int ds1621_read_value(struct i2c_client *client, u8 reg)
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{
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if (reg == DS1621_REG_CONF)
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return i2c_smbus_read_byte_data(client, reg);
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else
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return swab16(i2c_smbus_read_word_data(client, reg));
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}
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/* All registers are word-sized, except for the configuration register.
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DS1621 uses a high-byte first convention, which is exactly opposite to
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the usual practice. */
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static int ds1621_write_value(struct i2c_client *client, u8 reg, u16 value)
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{
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if (reg == DS1621_REG_CONF)
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return i2c_smbus_write_byte_data(client, reg, value);
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else
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return i2c_smbus_write_word_data(client, reg, swab16(value));
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}
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static void ds1621_init_client(struct i2c_client *client)
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{
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int reg = ds1621_read_value(client, DS1621_REG_CONF);
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/* switch to continous conversion mode */
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reg &= ~ DS1621_REG_CONFIG_1SHOT;
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/* setup output polarity */
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if (polarity == 0)
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reg &= ~DS1621_REG_CONFIG_POLARITY;
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else if (polarity == 1)
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reg |= DS1621_REG_CONFIG_POLARITY;
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ds1621_write_value(client, DS1621_REG_CONF, reg);
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/* start conversion */
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i2c_smbus_write_byte(client, DS1621_COM_START);
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}
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#define show(value) \
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static ssize_t show_##value(struct device *dev, char *buf) \
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{ \
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struct ds1621_data *data = ds1621_update_client(dev); \
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return sprintf(buf, "%d\n", LM75_TEMP_FROM_REG(data->value)); \
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}
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show(temp);
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show(temp_min);
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show(temp_max);
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#define set_temp(suffix, value, reg) \
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static ssize_t set_temp_##suffix(struct device *dev, const char *buf, \
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size_t count) \
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{ \
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struct i2c_client *client = to_i2c_client(dev); \
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struct ds1621_data *data = ds1621_update_client(dev); \
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u16 val = LM75_TEMP_TO_REG(simple_strtoul(buf, NULL, 10)); \
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\
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down(&data->update_lock); \
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data->value = val; \
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ds1621_write_value(client, reg, data->value); \
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up(&data->update_lock); \
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return count; \
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}
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set_temp(min, temp_min, DS1621_REG_TEMP_MIN);
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set_temp(max, temp_max, DS1621_REG_TEMP_MAX);
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static ssize_t show_alarms(struct device *dev, char *buf)
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{
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struct ds1621_data *data = ds1621_update_client(dev);
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return sprintf(buf, "%d\n", ALARMS_FROM_REG(data->conf));
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}
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static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
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static DEVICE_ATTR(temp1_input, S_IRUGO , show_temp, NULL);
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static DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO , show_temp_min, set_temp_min);
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static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, set_temp_max);
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static int ds1621_attach_adapter(struct i2c_adapter *adapter)
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{
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return i2c_detect(adapter, &addr_data, ds1621_detect);
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}
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/* This function is called by i2c_detect */
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int ds1621_detect(struct i2c_adapter *adapter, int address,
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int kind)
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{
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int conf, temp;
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struct i2c_client *new_client;
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struct ds1621_data *data;
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int err = 0;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
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| I2C_FUNC_SMBUS_WORD_DATA
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| I2C_FUNC_SMBUS_WRITE_BYTE))
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goto exit;
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/* OK. For now, we presume we have a valid client. We now create the
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client structure, even though we cannot fill it completely yet.
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But it allows us to access ds1621_{read,write}_value. */
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if (!(data = kmalloc(sizeof(struct ds1621_data), GFP_KERNEL))) {
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err = -ENOMEM;
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goto exit;
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}
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memset(data, 0, sizeof(struct ds1621_data));
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new_client = &data->client;
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i2c_set_clientdata(new_client, data);
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new_client->addr = address;
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new_client->adapter = adapter;
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new_client->driver = &ds1621_driver;
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new_client->flags = 0;
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/* Now, we do the remaining detection. It is lousy. */
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if (kind < 0) {
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/* The NVB bit should be low if no EEPROM write has been
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requested during the latest 10ms, which is highly
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improbable in our case. */
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conf = ds1621_read_value(new_client, DS1621_REG_CONF);
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if (conf & DS1621_REG_CONFIG_NVB)
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goto exit_free;
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/* The 7 lowest bits of a temperature should always be 0. */
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temp = ds1621_read_value(new_client, DS1621_REG_TEMP);
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if (temp & 0x007f)
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goto exit_free;
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temp = ds1621_read_value(new_client, DS1621_REG_TEMP_MIN);
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if (temp & 0x007f)
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goto exit_free;
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temp = ds1621_read_value(new_client, DS1621_REG_TEMP_MAX);
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if (temp & 0x007f)
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goto exit_free;
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}
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/* Determine the chip type - only one kind supported! */
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if (kind <= 0)
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kind = ds1621;
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/* Fill in remaining client fields and put it into the global list */
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strlcpy(new_client->name, "ds1621", I2C_NAME_SIZE);
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data->valid = 0;
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init_MUTEX(&data->update_lock);
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/* Tell the I2C layer a new client has arrived */
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if ((err = i2c_attach_client(new_client)))
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goto exit_free;
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/* Initialize the DS1621 chip */
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ds1621_init_client(new_client);
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/* Register sysfs hooks */
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device_create_file(&new_client->dev, &dev_attr_alarms);
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device_create_file(&new_client->dev, &dev_attr_temp1_input);
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device_create_file(&new_client->dev, &dev_attr_temp1_min);
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device_create_file(&new_client->dev, &dev_attr_temp1_max);
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return 0;
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/* OK, this is not exactly good programming practice, usually. But it is
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very code-efficient in this case. */
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exit_free:
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kfree(data);
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exit:
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return err;
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}
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static int ds1621_detach_client(struct i2c_client *client)
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{
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int err;
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if ((err = i2c_detach_client(client))) {
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dev_err(&client->dev, "Client deregistration failed, "
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"client not detached.\n");
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return err;
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}
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kfree(i2c_get_clientdata(client));
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return 0;
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}
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static struct ds1621_data *ds1621_update_client(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct ds1621_data *data = i2c_get_clientdata(client);
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u8 new_conf;
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down(&data->update_lock);
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if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
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|| !data->valid) {
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dev_dbg(&client->dev, "Starting ds1621 update\n");
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data->conf = ds1621_read_value(client, DS1621_REG_CONF);
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data->temp = ds1621_read_value(client, DS1621_REG_TEMP);
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data->temp_min = ds1621_read_value(client,
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DS1621_REG_TEMP_MIN);
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data->temp_max = ds1621_read_value(client,
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DS1621_REG_TEMP_MAX);
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/* reset alarms if neccessary */
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new_conf = data->conf;
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if (data->temp < data->temp_min)
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new_conf &= ~DS1621_ALARM_TEMP_LOW;
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if (data->temp > data->temp_max)
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new_conf &= ~DS1621_ALARM_TEMP_HIGH;
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if (data->conf != new_conf)
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ds1621_write_value(client, DS1621_REG_CONF,
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new_conf);
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data->last_updated = jiffies;
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data->valid = 1;
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}
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up(&data->update_lock);
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return data;
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}
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static int __init ds1621_init(void)
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{
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return i2c_add_driver(&ds1621_driver);
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}
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static void __exit ds1621_exit(void)
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{
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i2c_del_driver(&ds1621_driver);
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}
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MODULE_AUTHOR("Christian W. Zuckschwerdt <zany@triq.net>");
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MODULE_DESCRIPTION("DS1621 driver");
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MODULE_LICENSE("GPL");
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module_init(ds1621_init);
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module_exit(ds1621_exit);
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