mirror of
https://github.com/lm-sensors/lm-sensors.git
synced 2026-10-15 10:39:31 +00:00
Jean Delvare
239b3d0344
git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@2445 7894878c-1315-0410-8ee3-d5d059ff63e0
528 lines
16 KiB
C
528 lines
16 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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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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/* Supports DS1621. See doc/chips/ds1621 for details */
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/i2c-proc.h>
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#include <linux/init.h>
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#include "version.h"
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MODULE_LICENSE("GPL");
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/* Addresses to scan */
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static unsigned short normal_i2c[] = { SENSORS_I2C_END };
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static unsigned short normal_i2c_range[] = { 0x48, 0x4f, SENSORS_I2C_END };
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static unsigned int normal_isa[] = { SENSORS_ISA_END };
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static unsigned int normal_isa_range[] = { SENSORS_ISA_END };
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/* Insmod parameters */
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SENSORS_INSMOD_1(ds1621);
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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 | 1 | 0 |POL |1SHOT| */
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#define DS1621_REG_CONFIG_MASK 0x0C
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#define DS1621_REG_CONFIG_VAL 0x08
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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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/* Note: the done bit is always unset if continuous conversion is in progress.
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We need to stop the continuous conversion or switch to single shot
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before this bit becomes available!
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*/
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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_OVER 0xA1 /* word, RW */
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#define DS1621_REG_TEMP_HYST 0xA2 /* word, RW -- it's a low temp trigger */
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#define DS1621_REG_CONF 0xAC /* byte, RW */
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#define DS1621_REG_TEMP_COUNTER 0xA8 /* byte, RO */
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#define DS1621_REG_TEMP_SLOPE 0xA9 /* byte, RO */
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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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/* 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 TEMP_FROM_REG(val) ((((val & 0x7fff) >> 7) * 5) | \
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((val & 0x8000)?-256:0))
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#define TEMP_TO_REG(val) (SENSORS_LIMIT((val<0 ? (0x200+((val)/5))<<7 : \
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(((val) + 2) / 5) << 7),0,0xffff))
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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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#define ITEMP_FROM_REG(val) ((((val & 0x7fff) >> 8)) | \
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((val & 0x8000)?-256:0))
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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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int sysctl_id;
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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_over, temp_hyst; /* Register values, word */
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u8 conf; /* Register encoding, combined */
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char enable; /* !=0 if we're expected to restart the conversion */
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u8 temp_int, temp_counter, temp_slope; /* Register values, byte */
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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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unsigned short flags, 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 int ds1621_read_value(struct i2c_client *client, u8 reg);
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static int ds1621_write_value(struct i2c_client *client, u8 reg, u16 value);
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static void ds1621_temp(struct i2c_client *client, int operation,
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int ctl_name, int *nrels_mag, long *results);
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static void ds1621_alarms(struct i2c_client *client, int operation,
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int ctl_name, int *nrels_mag, long *results);
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static void ds1621_enable(struct i2c_client *client, int operation,
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int ctl_name, int *nrels_mag, long *results);
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static void ds1621_continuous(struct i2c_client *client, int operation,
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int ctl_name, int *nrels_mag, long *results);
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static void ds1621_polarity(struct i2c_client *client, int operation,
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int ctl_name, int *nrels_mag, long *results);
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static void ds1621_update_client(struct i2c_client *client);
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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 sensor driver",
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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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/* -- SENSORS SYSCTL START -- */
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#define DS1621_SYSCTL_TEMP 1200 /* Degrees Celcius * 10 */
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#define DS1621_SYSCTL_ALARMS 2001 /* bitvector */
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#define DS1621_ALARM_TEMP_HIGH 0x40
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#define DS1621_ALARM_TEMP_LOW 0x20
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#define DS1621_SYSCTL_ENABLE 2002
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#define DS1621_SYSCTL_CONTINUOUS 2003
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#define DS1621_SYSCTL_POLARITY 2004
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/* -- SENSORS SYSCTL END -- */
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/* These files are created for each detected DS1621. This is just a template;
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though at first sight, you might think we could use a statically
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allocated list, we need some way to get back to the parent - which
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is done through one of the 'extra' fields which are initialized
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when a new copy is allocated. */
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static ctl_table ds1621_dir_table_template[] = {
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{DS1621_SYSCTL_TEMP, "temp", NULL, 0, 0644, NULL,
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&i2c_proc_real, &i2c_sysctl_real, NULL, &ds1621_temp},
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{DS1621_SYSCTL_ALARMS, "alarms", NULL, 0, 0444, NULL,
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&i2c_proc_real, &i2c_sysctl_real, NULL, &ds1621_alarms},
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{DS1621_SYSCTL_ENABLE, "enable", NULL, 0, 0644, NULL,
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&i2c_proc_real, &i2c_sysctl_real, NULL, &ds1621_enable},
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{DS1621_SYSCTL_CONTINUOUS, "continuous", NULL, 0, 0644, NULL,
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&i2c_proc_real, &i2c_sysctl_real, NULL, &ds1621_continuous},
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{DS1621_SYSCTL_POLARITY, "polarity", NULL, 0, 0644, NULL,
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&i2c_proc_real, &i2c_sysctl_real, NULL, &ds1621_polarity},
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{0}
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};
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static int ds1621_id = 0;
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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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unsigned short flags, int kind)
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{
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int i, conf;
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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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const char *type_name, *client_name;
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/* Make sure we aren't probing the ISA bus!! This is just a safety check
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at this moment; i2c_detect really won't call us. */
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#ifdef DEBUG
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if (i2c_is_isa_adapter(adapter)) {
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printk
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("ds1621.o: ds1621_detect called for an ISA bus adapter?!?\n");
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return 0;
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}
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#endif
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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 ERROR0;
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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 ERROR0;
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}
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new_client = &data->client;
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new_client->addr = address;
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new_client->data = data;
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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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conf = i2c_smbus_read_byte_data(new_client,
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DS1621_REG_CONF);
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if ((conf & DS1621_REG_CONFIG_MASK)
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!= DS1621_REG_CONFIG_VAL)
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goto ERROR1;
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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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if (kind == ds1621) {
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type_name = "ds1621";
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client_name = "DS1621 chip";
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} else {
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#ifdef DEBUG
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printk("ds1621.o: Internal error: unknown kind (%d)?!?",
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kind);
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#endif
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goto ERROR1;
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}
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/* Fill in remaining client fields and put it into the global list */
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strcpy(new_client->name, client_name);
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new_client->id = ds1621_id++;
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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 ERROR3;
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/* Register a new directory entry with module sensors */
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if ((i = i2c_register_entry(new_client, type_name,
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ds1621_dir_table_template)) < 0) {
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err = i;
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goto ERROR4;
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}
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data->sysctl_id = i;
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ds1621_init_client(new_client);
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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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ERROR4:
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i2c_detach_client(new_client);
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ERROR3:
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ERROR1:
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kfree(data);
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ERROR0:
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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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i2c_deregister_entry(((struct ds1621_data *) (client->data))->
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sysctl_id);
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if ((err = i2c_detach_client(client))) {
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printk
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("ds1621.o: Client deregistration failed, client not detached.\n");
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return err;
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}
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kfree(client->data);
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return 0;
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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) || (reg == DS1621_REG_TEMP_COUNTER)
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|| (reg == DS1621_REG_TEMP_SLOPE))
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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_COM_START) || (reg == DS1621_COM_STOP) )
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return i2c_smbus_write_byte(client, reg);
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else
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if ((reg == DS1621_REG_CONF) || (reg == DS1621_REG_TEMP_COUNTER)
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|| (reg == DS1621_REG_TEMP_SLOPE))
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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;
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reg = ds1621_read_value(client, DS1621_REG_CONF);
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/* start the continous conversion */
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if(reg & 0x01)
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ds1621_write_value(client, DS1621_REG_CONF, reg & 0xfe);
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}
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static void ds1621_update_client(struct i2c_client *client)
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{
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struct ds1621_data *data = client->data;
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u8 new_conf;
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down(&data->update_lock);
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if ((jiffies - data->last_updated > HZ + HZ / 2) ||
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(jiffies < data->last_updated) || !data->valid) {
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#ifdef DEBUG
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printk("Starting ds1621 update\n");
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#endif
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data->conf = ds1621_read_value(client, DS1621_REG_CONF);
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data->temp = ds1621_read_value(client,
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DS1621_REG_TEMP);
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data->temp_over = ds1621_read_value(client,
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DS1621_REG_TEMP_OVER);
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data->temp_hyst = ds1621_read_value(client,
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DS1621_REG_TEMP_HYST);
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/* wait for the DONE bit before reading extended values */
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if (data->conf & DS1621_REG_CONFIG_DONE) {
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data->temp_counter = ds1621_read_value(client,
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DS1621_REG_TEMP_COUNTER);
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data->temp_slope = ds1621_read_value(client,
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DS1621_REG_TEMP_SLOPE);
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data->temp_int = ITEMP_FROM_REG(data->temp);
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/* restart the conversion */
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if (data->enable)
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ds1621_write_value(client, DS1621_COM_START, 0);
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}
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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_over)
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new_conf &= ~DS1621_ALARM_TEMP_HIGH;
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if (data->temp > data->temp_hyst)
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new_conf &= ~DS1621_ALARM_TEMP_LOW;
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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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}
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void ds1621_temp(struct i2c_client *client, int operation, int ctl_name,
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int *nrels_mag, long *results)
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{
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struct ds1621_data *data = client->data;
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if (operation == SENSORS_PROC_REAL_INFO)
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if (!(data->conf & DS1621_REG_CONFIG_DONE) ||
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(data->temp_counter > data->temp_slope) ||
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(data->temp_slope == 0)) {
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*nrels_mag = 1;
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} else {
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*nrels_mag = 2;
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}
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else if (operation == SENSORS_PROC_REAL_READ) {
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ds1621_update_client(client);
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/* decide wether to calculate more precise temp */
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if (!(data->conf & DS1621_REG_CONFIG_DONE) ||
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(data->temp_counter > data->temp_slope) ||
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(data->temp_slope == 0)) {
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results[0] = TEMP_FROM_REG(data->temp_over);
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results[1] = TEMP_FROM_REG(data->temp_hyst);
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results[2] = TEMP_FROM_REG(data->temp);
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} else {
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results[0] = TEMP_FROM_REG(data->temp_over)*10;
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results[1] = TEMP_FROM_REG(data->temp_hyst)*10;
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results[2] = data->temp_int * 100 - 25 +
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((data->temp_slope - data->temp_counter) *
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100 / data->temp_slope);
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}
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*nrels_mag = 3;
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} else if (operation == SENSORS_PROC_REAL_WRITE) {
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if (*nrels_mag >= 1) {
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data->temp_over = TEMP_TO_REG(results[0]);
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ds1621_write_value(client, DS1621_REG_TEMP_OVER,
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data->temp_over);
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}
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if (*nrels_mag >= 2) {
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data->temp_hyst = TEMP_TO_REG(results[1]);
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ds1621_write_value(client, DS1621_REG_TEMP_HYST,
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data->temp_hyst);
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}
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}
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}
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void ds1621_alarms(struct i2c_client *client, int operation, int ctl_name,
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int *nrels_mag, long *results)
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{
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struct ds1621_data *data = client->data;
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if (operation == SENSORS_PROC_REAL_INFO)
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*nrels_mag = 0;
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else if (operation == SENSORS_PROC_REAL_READ) {
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ds1621_update_client(client);
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results[0] = ALARMS_FROM_REG(data->conf);
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*nrels_mag = 1;
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}
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}
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void ds1621_enable(struct i2c_client *client, int operation, int ctl_name,
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int *nrels_mag, long *results)
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{
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/* If you really screw up your chip (like I did) this is */
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/* sometimes needed to (re)start the continous conversion */
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/* there is no data to read so this might hang your SMBus! */
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struct ds1621_data *data = client->data;
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if (operation == SENSORS_PROC_REAL_INFO)
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*nrels_mag = 0;
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else if (operation == SENSORS_PROC_REAL_READ) {
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ds1621_update_client(client);
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results[0] = !(data->conf & DS1621_REG_CONFIG_DONE);
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*nrels_mag = 1;
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} else if (operation == SENSORS_PROC_REAL_WRITE) {
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if (*nrels_mag >= 1) {
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if (results[0]) {
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|
ds1621_write_value(client, DS1621_COM_START, 0);
|
|
data->enable=1;
|
|
} else {
|
|
ds1621_write_value(client, DS1621_COM_STOP, 0);
|
|
data->enable=0;
|
|
}
|
|
} else {
|
|
ds1621_write_value(client, DS1621_COM_START, 0);
|
|
data->enable=1;
|
|
}
|
|
}
|
|
}
|
|
|
|
void ds1621_continuous(struct i2c_client *client, int operation, int ctl_name,
|
|
int *nrels_mag, long *results)
|
|
{
|
|
struct ds1621_data *data = client->data;
|
|
if (operation == SENSORS_PROC_REAL_INFO)
|
|
*nrels_mag = 0;
|
|
else if (operation == SENSORS_PROC_REAL_READ) {
|
|
ds1621_update_client(client);
|
|
results[0] = !(data->conf & DS1621_REG_CONFIG_1SHOT);
|
|
*nrels_mag = 1;
|
|
} else if (operation == SENSORS_PROC_REAL_WRITE) {
|
|
ds1621_update_client(client);
|
|
if (*nrels_mag >= 1) {
|
|
if (results[0]) {
|
|
ds1621_write_value(client, DS1621_REG_CONF,
|
|
data->conf & ~DS1621_REG_CONFIG_1SHOT);
|
|
} else {
|
|
ds1621_write_value(client, DS1621_REG_CONF,
|
|
data->conf | DS1621_REG_CONFIG_1SHOT);
|
|
}
|
|
} else {
|
|
ds1621_write_value(client, DS1621_REG_CONF,
|
|
data->conf & ~DS1621_REG_CONFIG_1SHOT);
|
|
}
|
|
}
|
|
}
|
|
|
|
void ds1621_polarity(struct i2c_client *client, int operation, int ctl_name,
|
|
int *nrels_mag, long *results)
|
|
{
|
|
struct ds1621_data *data = client->data;
|
|
if (operation == SENSORS_PROC_REAL_INFO)
|
|
*nrels_mag = 0;
|
|
else if (operation == SENSORS_PROC_REAL_READ) {
|
|
ds1621_update_client(client);
|
|
results[0] = !(!(data->conf & DS1621_REG_CONFIG_POLARITY));
|
|
*nrels_mag = 1;
|
|
} else if (operation == SENSORS_PROC_REAL_WRITE) {
|
|
ds1621_update_client(client);
|
|
if (*nrels_mag >= 1) {
|
|
if (results[0]) {
|
|
ds1621_write_value(client, DS1621_REG_CONF,
|
|
data->conf | DS1621_REG_CONFIG_POLARITY);
|
|
} else {
|
|
ds1621_write_value(client, DS1621_REG_CONF,
|
|
data->conf & ~DS1621_REG_CONFIG_POLARITY);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static int __init sm_ds1621_init(void)
|
|
{
|
|
printk("ds1621.o version %s (%s)\n", LM_VERSION, LM_DATE);
|
|
return i2c_add_driver(&ds1621_driver);
|
|
}
|
|
|
|
static void __exit sm_ds1621_exit(void)
|
|
{
|
|
i2c_del_driver(&ds1621_driver);
|
|
}
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Christian W. Zuckschwerdt <zany@triq.net>");
|
|
MODULE_DESCRIPTION("DS1621 driver");
|
|
|
|
module_init(sm_ds1621_init);
|
|
module_exit(sm_ds1621_exit);
|