summaryrefslogtreecommitdiff
path: root/drivers/i2c/chips/ds1621.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/i2c/chips/ds1621.c')
-rw-r--r--drivers/i2c/chips/ds1621.c341
1 files changed, 0 insertions, 341 deletions
diff --git a/drivers/i2c/chips/ds1621.c b/drivers/i2c/chips/ds1621.c
deleted file mode 100644
index 5360d58804f6..000000000000
--- a/drivers/i2c/chips/ds1621.c
+++ /dev/null
@@ -1,341 +0,0 @@
-/*
- ds1621.c - Part of lm_sensors, Linux kernel modules for hardware
- monitoring
- Christian W. Zuckschwerdt <zany@triq.net> 2000-11-23
- based on lm75.c by Frodo Looijaard <frodol@dds.nl>
- Ported to Linux 2.6 by Aurelien Jarno <aurelien@aurel32.net> with
- the help of Jean Delvare <khali@linux-fr.org>
-
- 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(ds1621);
-static int polarity = -1;
-module_param(polarity, int, 0);
-MODULE_PARM_DESC(polarity, "Output's polarity: 0 = active high, 1 = active low");
-
-/* Many DS1621 constants specified below */
-/* Config register used for detection */
-/* 7 6 5 4 3 2 1 0 */
-/* |Done|THF |TLF |NVB | X | X |POL |1SHOT| */
-#define DS1621_REG_CONFIG_NVB 0x10
-#define DS1621_REG_CONFIG_POLARITY 0x02
-#define DS1621_REG_CONFIG_1SHOT 0x01
-#define DS1621_REG_CONFIG_DONE 0x80
-
-/* The DS1621 registers */
-#define DS1621_REG_TEMP 0xAA /* word, RO */
-#define DS1621_REG_TEMP_MIN 0xA1 /* word, RW */
-#define DS1621_REG_TEMP_MAX 0xA2 /* word, RW */
-#define DS1621_REG_CONF 0xAC /* byte, RW */
-#define DS1621_COM_START 0xEE /* no data */
-#define DS1621_COM_STOP 0x22 /* no data */
-
-/* The DS1621 configuration register */
-#define DS1621_ALARM_TEMP_HIGH 0x40
-#define DS1621_ALARM_TEMP_LOW 0x20
-
-/* Conversions. Rounding and limit checking is only done on the TO_REG
- variants. Note that you should be a bit careful with which arguments
- these macros are called: arguments may be evaluated more than once.
- Fixing this is just not worth it. */
-#define ALARMS_FROM_REG(val) ((val) & \
- (DS1621_ALARM_TEMP_HIGH | DS1621_ALARM_TEMP_LOW))
-
-/* Each client has this additional data */
-struct ds1621_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, temp_min, temp_max; /* Register values, word */
- u8 conf; /* Register encoding, combined */
-};
-
-static int ds1621_attach_adapter(struct i2c_adapter *adapter);
-static int ds1621_detect(struct i2c_adapter *adapter, int address,
- int kind);
-static void ds1621_init_client(struct i2c_client *client);
-static int ds1621_detach_client(struct i2c_client *client);
-static struct ds1621_data *ds1621_update_client(struct device *dev);
-
-/* This is the driver that will be inserted */
-static struct i2c_driver ds1621_driver = {
- .owner = THIS_MODULE,
- .name = "ds1621",
- .id = I2C_DRIVERID_DS1621,
- .flags = I2C_DF_NOTIFY,
- .attach_adapter = ds1621_attach_adapter,
- .detach_client = ds1621_detach_client,
-};
-
-/* All registers are word-sized, except for the configuration register.
- DS1621 uses a high-byte first convention, which is exactly opposite to
- the usual practice. */
-static int ds1621_read_value(struct i2c_client *client, u8 reg)
-{
- if (reg == DS1621_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.
- DS1621 uses a high-byte first convention, which is exactly opposite to
- the usual practice. */
-static int ds1621_write_value(struct i2c_client *client, u8 reg, u16 value)
-{
- if (reg == DS1621_REG_CONF)
- return i2c_smbus_write_byte_data(client, reg, value);
- else
- return i2c_smbus_write_word_data(client, reg, swab16(value));
-}
-
-static void ds1621_init_client(struct i2c_client *client)
-{
- int reg = ds1621_read_value(client, DS1621_REG_CONF);
- /* switch to continuous conversion mode */
- reg &= ~ DS1621_REG_CONFIG_1SHOT;
-
- /* setup output polarity */
- if (polarity == 0)
- reg &= ~DS1621_REG_CONFIG_POLARITY;
- else if (polarity == 1)
- reg |= DS1621_REG_CONFIG_POLARITY;
-
- ds1621_write_value(client, DS1621_REG_CONF, reg);
-
- /* start conversion */
- i2c_smbus_write_byte(client, DS1621_COM_START);
-}
-
-#define show(value) \
-static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \
-{ \
- struct ds1621_data *data = ds1621_update_client(dev); \
- return sprintf(buf, "%d\n", LM75_TEMP_FROM_REG(data->value)); \
-}
-
-show(temp);
-show(temp_min);
-show(temp_max);
-
-#define set_temp(suffix, value, reg) \
-static ssize_t set_temp_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
- size_t count) \
-{ \
- struct i2c_client *client = to_i2c_client(dev); \
- struct ds1621_data *data = ds1621_update_client(dev); \
- u16 val = LM75_TEMP_TO_REG(simple_strtoul(buf, NULL, 10)); \
- \
- down(&data->update_lock); \
- data->value = val; \
- ds1621_write_value(client, reg, data->value); \
- up(&data->update_lock); \
- return count; \
-}
-
-set_temp(min, temp_min, DS1621_REG_TEMP_MIN);
-set_temp(max, temp_max, DS1621_REG_TEMP_MAX);
-
-static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
-{
- struct ds1621_data *data = ds1621_update_client(dev);
- return sprintf(buf, "%d\n", ALARMS_FROM_REG(data->conf));
-}
-
-static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
-static DEVICE_ATTR(temp1_input, S_IRUGO , show_temp, NULL);
-static DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO , show_temp_min, set_temp_min);
-static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, set_temp_max);
-
-
-static int ds1621_attach_adapter(struct i2c_adapter *adapter)
-{
- return i2c_detect(adapter, &addr_data, ds1621_detect);
-}
-
-/* This function is called by i2c_detect */
-int ds1621_detect(struct i2c_adapter *adapter, int address,
- int kind)
-{
- int conf, temp;
- struct i2c_client *new_client;
- struct ds1621_data *data;
- int err = 0;
-
- if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
- | I2C_FUNC_SMBUS_WORD_DATA
- | I2C_FUNC_SMBUS_WRITE_BYTE))
- 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 ds1621_{read,write}_value. */
- if (!(data = kmalloc(sizeof(struct ds1621_data), GFP_KERNEL))) {
- err = -ENOMEM;
- goto exit;
- }
- memset(data, 0, sizeof(struct ds1621_data));
-
- new_client = &data->client;
- i2c_set_clientdata(new_client, data);
- new_client->addr = address;
- new_client->adapter = adapter;
- new_client->driver = &ds1621_driver;
- new_client->flags = 0;
-
-
- /* Now, we do the remaining detection. It is lousy. */
- if (kind < 0) {
- /* The NVB bit should be low if no EEPROM write has been
- requested during the latest 10ms, which is highly
- improbable in our case. */
- conf = ds1621_read_value(new_client, DS1621_REG_CONF);
- if (conf & DS1621_REG_CONFIG_NVB)
- goto exit_free;
- /* The 7 lowest bits of a temperature should always be 0. */
- temp = ds1621_read_value(new_client, DS1621_REG_TEMP);
- if (temp & 0x007f)
- goto exit_free;
- temp = ds1621_read_value(new_client, DS1621_REG_TEMP_MIN);
- if (temp & 0x007f)
- goto exit_free;
- temp = ds1621_read_value(new_client, DS1621_REG_TEMP_MAX);
- if (temp & 0x007f)
- goto exit_free;
- }
-
- /* Determine the chip type - only one kind supported! */
- if (kind <= 0)
- kind = ds1621;
-
- /* Fill in remaining client fields and put it into the global list */
- strlcpy(new_client->name, "ds1621", 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 DS1621 chip */
- ds1621_init_client(new_client);
-
- /* Register sysfs hooks */
- device_create_file(&new_client->dev, &dev_attr_alarms);
- device_create_file(&new_client->dev, &dev_attr_temp1_input);
- device_create_file(&new_client->dev, &dev_attr_temp1_min);
- device_create_file(&new_client->dev, &dev_attr_temp1_max);
-
- return 0;
-
-/* OK, this is not exactly good programming practice, usually. But it is
- very code-efficient in this case. */
- exit_free:
- kfree(data);
- exit:
- return err;
-}
-
-static int ds1621_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 ds1621_data *ds1621_update_client(struct device *dev)
-{
- struct i2c_client *client = to_i2c_client(dev);
- struct ds1621_data *data = i2c_get_clientdata(client);
- u8 new_conf;
-
- down(&data->update_lock);
-
- if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
- || !data->valid) {
-
- dev_dbg(&client->dev, "Starting ds1621 update\n");
-
- data->conf = ds1621_read_value(client, DS1621_REG_CONF);
-
- data->temp = ds1621_read_value(client, DS1621_REG_TEMP);
-
- data->temp_min = ds1621_read_value(client,
- DS1621_REG_TEMP_MIN);
- data->temp_max = ds1621_read_value(client,
- DS1621_REG_TEMP_MAX);
-
- /* reset alarms if necessary */
- new_conf = data->conf;
- if (data->temp < data->temp_min)
- new_conf &= ~DS1621_ALARM_TEMP_LOW;
- if (data->temp > data->temp_max)
- new_conf &= ~DS1621_ALARM_TEMP_HIGH;
- if (data->conf != new_conf)
- ds1621_write_value(client, DS1621_REG_CONF,
- new_conf);
-
- data->last_updated = jiffies;
- data->valid = 1;
- }
-
- up(&data->update_lock);
-
- return data;
-}
-
-static int __init ds1621_init(void)
-{
- return i2c_add_driver(&ds1621_driver);
-}
-
-static void __exit ds1621_exit(void)
-{
- i2c_del_driver(&ds1621_driver);
-}
-
-
-MODULE_AUTHOR("Christian W. Zuckschwerdt <zany@triq.net>");
-MODULE_DESCRIPTION("DS1621 driver");
-MODULE_LICENSE("GPL");
-
-module_init(ds1621_init);
-module_exit(ds1621_exit);
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-02 00:25:01 +0000