373 lines
10 KiB
C
373 lines
10 KiB
C
/*
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* max1619.c - Part of lm_sensors, Linux kernel modules for hardware
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* monitoring
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* Copyright (C) 2003-2004 Alexey Fisher <fishor@mail.ru>
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* Jean Delvare <khali@linux-fr.org>
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*
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* Based on the lm90 driver. The MAX1619 is a sensor chip made by Maxim.
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* It reports up to two temperatures (its own plus up to
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* one external one). Complete datasheet can be
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* obtained from Maxim's website at:
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* http://pdfserv.maxim-ic.com/en/ds/MAX1619.pdf
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*
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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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*
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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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*
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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/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/err.h>
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#include <linux/mutex.h>
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#include <linux/sysfs.h>
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static const unsigned short normal_i2c[] = {
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0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
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/*
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* The MAX1619 registers
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*/
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#define MAX1619_REG_R_MAN_ID 0xFE
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#define MAX1619_REG_R_CHIP_ID 0xFF
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#define MAX1619_REG_R_CONFIG 0x03
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#define MAX1619_REG_W_CONFIG 0x09
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#define MAX1619_REG_R_CONVRATE 0x04
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#define MAX1619_REG_W_CONVRATE 0x0A
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#define MAX1619_REG_R_STATUS 0x02
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#define MAX1619_REG_R_LOCAL_TEMP 0x00
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#define MAX1619_REG_R_REMOTE_TEMP 0x01
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#define MAX1619_REG_R_REMOTE_HIGH 0x07
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#define MAX1619_REG_W_REMOTE_HIGH 0x0D
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#define MAX1619_REG_R_REMOTE_LOW 0x08
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#define MAX1619_REG_W_REMOTE_LOW 0x0E
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#define MAX1619_REG_R_REMOTE_CRIT 0x10
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#define MAX1619_REG_W_REMOTE_CRIT 0x12
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#define MAX1619_REG_R_TCRIT_HYST 0x11
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#define MAX1619_REG_W_TCRIT_HYST 0x13
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/*
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* Conversions
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*/
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static int temp_from_reg(int val)
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{
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return (val & 0x80 ? val-0x100 : val) * 1000;
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}
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static int temp_to_reg(int val)
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{
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return (val < 0 ? val+0x100*1000 : val) / 1000;
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}
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/*
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* Functions declaration
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*/
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static int max1619_probe(struct i2c_client *client,
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const struct i2c_device_id *id);
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static int max1619_detect(struct i2c_client *client,
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struct i2c_board_info *info);
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static void max1619_init_client(struct i2c_client *client);
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static int max1619_remove(struct i2c_client *client);
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static struct max1619_data *max1619_update_device(struct device *dev);
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/*
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* Driver data (common to all clients)
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*/
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static const struct i2c_device_id max1619_id[] = {
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{ "max1619", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, max1619_id);
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static struct i2c_driver max1619_driver = {
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.class = I2C_CLASS_HWMON,
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.driver = {
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.name = "max1619",
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},
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.probe = max1619_probe,
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.remove = max1619_remove,
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.id_table = max1619_id,
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.detect = max1619_detect,
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.address_list = normal_i2c,
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};
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/*
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* Client data (each client gets its own)
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*/
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struct max1619_data {
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struct device *hwmon_dev;
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struct mutex update_lock;
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char valid; /* zero until following fields are valid */
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unsigned long last_updated; /* in jiffies */
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/* registers values */
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u8 temp_input1; /* local */
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u8 temp_input2, temp_low2, temp_high2; /* remote */
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u8 temp_crit2;
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u8 temp_hyst2;
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u8 alarms;
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};
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/*
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* Sysfs stuff
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*/
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#define show_temp(value) \
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static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \
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{ \
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struct max1619_data *data = max1619_update_device(dev); \
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return sprintf(buf, "%d\n", temp_from_reg(data->value)); \
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}
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show_temp(temp_input1);
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show_temp(temp_input2);
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show_temp(temp_low2);
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show_temp(temp_high2);
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show_temp(temp_crit2);
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show_temp(temp_hyst2);
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#define set_temp2(value, reg) \
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static ssize_t set_##value(struct device *dev, struct device_attribute *attr, 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 max1619_data *data = i2c_get_clientdata(client); \
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long val = simple_strtol(buf, NULL, 10); \
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\
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mutex_lock(&data->update_lock); \
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data->value = temp_to_reg(val); \
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i2c_smbus_write_byte_data(client, reg, data->value); \
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mutex_unlock(&data->update_lock); \
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return count; \
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}
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set_temp2(temp_low2, MAX1619_REG_W_REMOTE_LOW);
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set_temp2(temp_high2, MAX1619_REG_W_REMOTE_HIGH);
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set_temp2(temp_crit2, MAX1619_REG_W_REMOTE_CRIT);
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set_temp2(temp_hyst2, MAX1619_REG_W_TCRIT_HYST);
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static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct max1619_data *data = max1619_update_device(dev);
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return sprintf(buf, "%d\n", data->alarms);
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}
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static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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int bitnr = to_sensor_dev_attr(attr)->index;
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struct max1619_data *data = max1619_update_device(dev);
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return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
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}
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static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
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static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input2, NULL);
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static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_low2,
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set_temp_low2);
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static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_high2,
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set_temp_high2);
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static DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit2,
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set_temp_crit2);
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static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp_hyst2,
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set_temp_hyst2);
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static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
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static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
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static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
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static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
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static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
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static struct attribute *max1619_attributes[] = {
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&dev_attr_temp1_input.attr,
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&dev_attr_temp2_input.attr,
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&dev_attr_temp2_min.attr,
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&dev_attr_temp2_max.attr,
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&dev_attr_temp2_crit.attr,
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&dev_attr_temp2_crit_hyst.attr,
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&dev_attr_alarms.attr,
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&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
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&sensor_dev_attr_temp2_fault.dev_attr.attr,
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&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
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&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
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NULL
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};
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static const struct attribute_group max1619_group = {
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.attrs = max1619_attributes,
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};
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/*
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* Real code
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*/
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/* Return 0 if detection is successful, -ENODEV otherwise */
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static int max1619_detect(struct i2c_client *client,
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struct i2c_board_info *info)
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{
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struct i2c_adapter *adapter = client->adapter;
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u8 reg_config, reg_convrate, reg_status, man_id, chip_id;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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return -ENODEV;
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/* detection */
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reg_config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
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reg_convrate = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONVRATE);
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reg_status = i2c_smbus_read_byte_data(client, MAX1619_REG_R_STATUS);
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if ((reg_config & 0x03) != 0x00
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|| reg_convrate > 0x07 || (reg_status & 0x61) != 0x00) {
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dev_dbg(&adapter->dev, "MAX1619 detection failed at 0x%02x\n",
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client->addr);
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return -ENODEV;
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}
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/* identification */
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man_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_MAN_ID);
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chip_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CHIP_ID);
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if (man_id != 0x4D || chip_id != 0x04) {
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dev_info(&adapter->dev,
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"Unsupported chip (man_id=0x%02X, chip_id=0x%02X).\n",
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man_id, chip_id);
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return -ENODEV;
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}
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strlcpy(info->type, "max1619", I2C_NAME_SIZE);
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return 0;
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}
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static int max1619_probe(struct i2c_client *new_client,
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const struct i2c_device_id *id)
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{
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struct max1619_data *data;
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int err;
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data = kzalloc(sizeof(struct max1619_data), GFP_KERNEL);
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if (!data) {
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err = -ENOMEM;
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goto exit;
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}
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i2c_set_clientdata(new_client, data);
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data->valid = 0;
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mutex_init(&data->update_lock);
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/* Initialize the MAX1619 chip */
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max1619_init_client(new_client);
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/* Register sysfs hooks */
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if ((err = sysfs_create_group(&new_client->dev.kobj, &max1619_group)))
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goto exit_free;
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data->hwmon_dev = hwmon_device_register(&new_client->dev);
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if (IS_ERR(data->hwmon_dev)) {
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err = PTR_ERR(data->hwmon_dev);
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goto exit_remove_files;
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}
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return 0;
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exit_remove_files:
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sysfs_remove_group(&new_client->dev.kobj, &max1619_group);
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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 void max1619_init_client(struct i2c_client *client)
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{
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u8 config;
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/*
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* Start the conversions.
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*/
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i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONVRATE,
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5); /* 2 Hz */
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config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
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if (config & 0x40)
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i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONFIG,
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config & 0xBF); /* run */
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}
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static int max1619_remove(struct i2c_client *client)
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{
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struct max1619_data *data = i2c_get_clientdata(client);
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hwmon_device_unregister(data->hwmon_dev);
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sysfs_remove_group(&client->dev.kobj, &max1619_group);
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kfree(data);
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return 0;
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}
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static struct max1619_data *max1619_update_device(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct max1619_data *data = i2c_get_clientdata(client);
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mutex_lock(&data->update_lock);
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if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
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dev_dbg(&client->dev, "Updating max1619 data.\n");
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data->temp_input1 = i2c_smbus_read_byte_data(client,
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MAX1619_REG_R_LOCAL_TEMP);
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data->temp_input2 = i2c_smbus_read_byte_data(client,
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MAX1619_REG_R_REMOTE_TEMP);
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data->temp_high2 = i2c_smbus_read_byte_data(client,
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MAX1619_REG_R_REMOTE_HIGH);
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data->temp_low2 = i2c_smbus_read_byte_data(client,
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MAX1619_REG_R_REMOTE_LOW);
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data->temp_crit2 = i2c_smbus_read_byte_data(client,
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MAX1619_REG_R_REMOTE_CRIT);
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data->temp_hyst2 = i2c_smbus_read_byte_data(client,
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MAX1619_REG_R_TCRIT_HYST);
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data->alarms = i2c_smbus_read_byte_data(client,
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MAX1619_REG_R_STATUS);
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data->last_updated = jiffies;
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data->valid = 1;
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}
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mutex_unlock(&data->update_lock);
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return data;
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}
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static int __init sensors_max1619_init(void)
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{
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return i2c_add_driver(&max1619_driver);
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}
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static void __exit sensors_max1619_exit(void)
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{
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i2c_del_driver(&max1619_driver);
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}
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MODULE_AUTHOR("Alexey Fisher <fishor@mail.ru> and "
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"Jean Delvare <khali@linux-fr.org>");
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MODULE_DESCRIPTION("MAX1619 sensor driver");
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MODULE_LICENSE("GPL");
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module_init(sensors_max1619_init);
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module_exit(sensors_max1619_exit);
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