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![Jean Delvare](/assets/img/avatar_default.png)
The new-style adm1021 driver implements the optional detect() callback to cover the use cases of the legacy driver. Signed-off-by: Jean Delvare <khali@linux-fr.org>
469 lines
14 KiB
C
469 lines
14 KiB
C
/*
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adm1021.c - Part of lm_sensors, Linux kernel modules for hardware
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monitoring
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Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and
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Philip Edelbrock <phil@netroedge.com>
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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/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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/* Addresses to scan */
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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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/* Insmod parameters */
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I2C_CLIENT_INSMOD_8(adm1021, adm1023, max1617, max1617a, thmc10, lm84, gl523sm,
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mc1066);
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/* adm1021 constants specified below */
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/* The adm1021 registers */
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/* Read-only */
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/* For nr in 0-1 */
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#define ADM1021_REG_TEMP(nr) (nr)
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#define ADM1021_REG_STATUS 0x02
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/* 0x41 = AD, 0x49 = TI, 0x4D = Maxim, 0x23 = Genesys , 0x54 = Onsemi */
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#define ADM1021_REG_MAN_ID 0xFE
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/* ADM1021 = 0x0X, ADM1023 = 0x3X */
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#define ADM1021_REG_DEV_ID 0xFF
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/* These use different addresses for reading/writing */
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#define ADM1021_REG_CONFIG_R 0x03
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#define ADM1021_REG_CONFIG_W 0x09
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#define ADM1021_REG_CONV_RATE_R 0x04
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#define ADM1021_REG_CONV_RATE_W 0x0A
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/* These are for the ADM1023's additional precision on the remote temp sensor */
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#define ADM1023_REG_REM_TEMP_PREC 0x10
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#define ADM1023_REG_REM_OFFSET 0x11
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#define ADM1023_REG_REM_OFFSET_PREC 0x12
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#define ADM1023_REG_REM_TOS_PREC 0x13
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#define ADM1023_REG_REM_THYST_PREC 0x14
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/* limits */
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/* For nr in 0-1 */
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#define ADM1021_REG_TOS_R(nr) (0x05 + 2 * (nr))
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#define ADM1021_REG_TOS_W(nr) (0x0B + 2 * (nr))
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#define ADM1021_REG_THYST_R(nr) (0x06 + 2 * (nr))
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#define ADM1021_REG_THYST_W(nr) (0x0C + 2 * (nr))
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/* write-only */
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#define ADM1021_REG_ONESHOT 0x0F
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/* Initial values */
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/* Note: Even though I left the low and high limits named os and hyst,
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they don't quite work like a thermostat the way the LM75 does. I.e.,
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a lower temp than THYST actually triggers an alarm instead of
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clearing it. Weird, ey? --Phil */
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/* Each client has this additional data */
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struct adm1021_data {
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struct device *hwmon_dev;
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enum chips type;
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struct mutex 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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s8 temp_max[2]; /* Register values */
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s8 temp_min[2];
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s8 temp[2];
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u8 alarms;
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/* Special values for ADM1023 only */
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u8 remote_temp_prec;
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u8 remote_temp_os_prec;
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u8 remote_temp_hyst_prec;
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u8 remote_temp_offset;
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u8 remote_temp_offset_prec;
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};
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static int adm1021_probe(struct i2c_client *client,
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const struct i2c_device_id *id);
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static int adm1021_detect(struct i2c_client *client, int kind,
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struct i2c_board_info *info);
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static void adm1021_init_client(struct i2c_client *client);
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static int adm1021_remove(struct i2c_client *client);
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static struct adm1021_data *adm1021_update_device(struct device *dev);
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/* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */
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static int read_only;
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static const struct i2c_device_id adm1021_id[] = {
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{ "adm1021", adm1021 },
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{ "adm1023", adm1023 },
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{ "max1617", max1617 },
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{ "max1617a", max1617a },
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{ "thmc10", thmc10 },
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{ "lm84", lm84 },
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{ "gl523sm", gl523sm },
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{ "mc1066", mc1066 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, adm1021_id);
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/* This is the driver that will be inserted */
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static struct i2c_driver adm1021_driver = {
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.class = I2C_CLASS_HWMON,
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.driver = {
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.name = "adm1021",
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},
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.probe = adm1021_probe,
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.remove = adm1021_remove,
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.id_table = adm1021_id,
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.detect = adm1021_detect,
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.address_data = &addr_data,
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};
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static ssize_t show_temp(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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int index = to_sensor_dev_attr(devattr)->index;
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struct adm1021_data *data = adm1021_update_device(dev);
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return sprintf(buf, "%d\n", 1000 * data->temp[index]);
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}
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static ssize_t show_temp_max(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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int index = to_sensor_dev_attr(devattr)->index;
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struct adm1021_data *data = adm1021_update_device(dev);
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return sprintf(buf, "%d\n", 1000 * data->temp_max[index]);
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}
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static ssize_t show_temp_min(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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int index = to_sensor_dev_attr(devattr)->index;
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struct adm1021_data *data = adm1021_update_device(dev);
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return sprintf(buf, "%d\n", 1000 * data->temp_min[index]);
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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 index = to_sensor_dev_attr(attr)->index;
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struct adm1021_data *data = adm1021_update_device(dev);
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return sprintf(buf, "%u\n", (data->alarms >> index) & 1);
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}
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static ssize_t show_alarms(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct adm1021_data *data = adm1021_update_device(dev);
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return sprintf(buf, "%u\n", data->alarms);
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}
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static ssize_t set_temp_max(struct device *dev,
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struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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int index = to_sensor_dev_attr(devattr)->index;
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struct i2c_client *client = to_i2c_client(dev);
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struct adm1021_data *data = i2c_get_clientdata(client);
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long temp = simple_strtol(buf, NULL, 10) / 1000;
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mutex_lock(&data->update_lock);
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data->temp_max[index] = SENSORS_LIMIT(temp, -128, 127);
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if (!read_only)
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i2c_smbus_write_byte_data(client, ADM1021_REG_TOS_W(index),
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data->temp_max[index]);
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mutex_unlock(&data->update_lock);
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return count;
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}
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static ssize_t set_temp_min(struct device *dev,
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struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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int index = to_sensor_dev_attr(devattr)->index;
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struct i2c_client *client = to_i2c_client(dev);
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struct adm1021_data *data = i2c_get_clientdata(client);
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long temp = simple_strtol(buf, NULL, 10) / 1000;
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mutex_lock(&data->update_lock);
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data->temp_min[index] = SENSORS_LIMIT(temp, -128, 127);
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if (!read_only)
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i2c_smbus_write_byte_data(client, ADM1021_REG_THYST_W(index),
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data->temp_min[index]);
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mutex_unlock(&data->update_lock);
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return count;
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}
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static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
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static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max,
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set_temp_max, 0);
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static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_min,
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set_temp_min, 0);
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static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
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static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_max,
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set_temp_max, 1);
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static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_min,
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set_temp_min, 1);
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static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
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static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5);
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static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
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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_fault, S_IRUGO, show_alarm, NULL, 2);
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static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
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static struct attribute *adm1021_attributes[] = {
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&sensor_dev_attr_temp1_max.dev_attr.attr,
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&sensor_dev_attr_temp1_min.dev_attr.attr,
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_temp2_max.dev_attr.attr,
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&sensor_dev_attr_temp2_min.dev_attr.attr,
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&sensor_dev_attr_temp2_input.dev_attr.attr,
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&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
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&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
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&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
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&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
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&sensor_dev_attr_temp2_fault.dev_attr.attr,
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&dev_attr_alarms.attr,
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NULL
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};
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static const struct attribute_group adm1021_group = {
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.attrs = adm1021_attributes,
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};
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/* Return 0 if detection is successful, -ENODEV otherwise */
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static int adm1021_detect(struct i2c_client *client, int kind,
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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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int i;
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const char *type_name = "";
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int conv_rate, status, config;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
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pr_debug("adm1021: detect failed, "
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"smbus byte data not supported!\n");
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return -ENODEV;
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}
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status = i2c_smbus_read_byte_data(client, ADM1021_REG_STATUS);
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conv_rate = i2c_smbus_read_byte_data(client,
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ADM1021_REG_CONV_RATE_R);
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config = i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R);
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/* Now, we do the remaining detection. */
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if (kind < 0) {
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if ((status & 0x03) != 0x00 || (config & 0x3F) != 0x00
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|| (conv_rate & 0xF8) != 0x00) {
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pr_debug("adm1021: detect failed, "
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"chip not detected!\n");
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return -ENODEV;
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}
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}
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/* Determine the chip type. */
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if (kind <= 0) {
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i = i2c_smbus_read_byte_data(client, ADM1021_REG_MAN_ID);
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if (i == 0x41)
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if ((i2c_smbus_read_byte_data(client,
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ADM1021_REG_DEV_ID) & 0xF0) == 0x30)
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kind = adm1023;
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else
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kind = adm1021;
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else if (i == 0x49)
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kind = thmc10;
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else if (i == 0x23)
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kind = gl523sm;
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else if ((i == 0x4d) &&
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(i2c_smbus_read_byte_data(client,
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ADM1021_REG_DEV_ID) == 0x01))
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kind = max1617a;
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else if (i == 0x54)
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kind = mc1066;
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/* LM84 Mfr ID in a different place, and it has more unused bits */
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else if (conv_rate == 0x00
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&& (kind == 0 /* skip extra detection */
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|| ((config & 0x7F) == 0x00
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&& (status & 0xAB) == 0x00)))
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kind = lm84;
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else
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kind = max1617;
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}
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if (kind == max1617) {
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type_name = "max1617";
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} else if (kind == max1617a) {
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type_name = "max1617a";
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} else if (kind == adm1021) {
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type_name = "adm1021";
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} else if (kind == adm1023) {
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type_name = "adm1023";
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} else if (kind == thmc10) {
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type_name = "thmc10";
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} else if (kind == lm84) {
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type_name = "lm84";
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} else if (kind == gl523sm) {
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type_name = "gl523sm";
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} else if (kind == mc1066) {
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type_name = "mc1066";
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}
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pr_debug("adm1021: Detected chip %s at adapter %d, address 0x%02x.\n",
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type_name, i2c_adapter_id(adapter), client->addr);
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strlcpy(info->type, type_name, I2C_NAME_SIZE);
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return 0;
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}
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static int adm1021_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct adm1021_data *data;
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int err;
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data = kzalloc(sizeof(struct adm1021_data), GFP_KERNEL);
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if (!data) {
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pr_debug("adm1021: detect failed, kzalloc failed!\n");
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err = -ENOMEM;
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goto error0;
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}
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i2c_set_clientdata(client, data);
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data->type = id->driver_data;
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mutex_init(&data->update_lock);
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/* Initialize the ADM1021 chip */
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if (data->type != lm84 && !read_only)
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adm1021_init_client(client);
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/* Register sysfs hooks */
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if ((err = sysfs_create_group(&client->dev.kobj, &adm1021_group)))
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goto error1;
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data->hwmon_dev = hwmon_device_register(&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 error3;
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}
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return 0;
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error3:
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sysfs_remove_group(&client->dev.kobj, &adm1021_group);
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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 void adm1021_init_client(struct i2c_client *client)
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{
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/* Enable ADC and disable suspend mode */
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i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W,
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i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R) & 0xBF);
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/* Set Conversion rate to 1/sec (this can be tinkered with) */
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i2c_smbus_write_byte_data(client, ADM1021_REG_CONV_RATE_W, 0x04);
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}
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static int adm1021_remove(struct i2c_client *client)
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{
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struct adm1021_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, &adm1021_group);
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kfree(data);
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return 0;
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}
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static struct adm1021_data *adm1021_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 adm1021_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 + HZ / 2)
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|| !data->valid) {
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int i;
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dev_dbg(&client->dev, "Starting adm1021 update\n");
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for (i = 0; i < 2; i++) {
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data->temp[i] = i2c_smbus_read_byte_data(client,
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ADM1021_REG_TEMP(i));
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data->temp_max[i] = i2c_smbus_read_byte_data(client,
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ADM1021_REG_TOS_R(i));
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data->temp_min[i] = i2c_smbus_read_byte_data(client,
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ADM1021_REG_THYST_R(i));
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}
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data->alarms = i2c_smbus_read_byte_data(client,
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ADM1021_REG_STATUS) & 0x7c;
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if (data->type == adm1023) {
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data->remote_temp_prec =
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i2c_smbus_read_byte_data(client,
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ADM1023_REG_REM_TEMP_PREC);
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data->remote_temp_os_prec =
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i2c_smbus_read_byte_data(client,
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ADM1023_REG_REM_TOS_PREC);
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data->remote_temp_hyst_prec =
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i2c_smbus_read_byte_data(client,
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ADM1023_REG_REM_THYST_PREC);
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data->remote_temp_offset =
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i2c_smbus_read_byte_data(client,
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ADM1023_REG_REM_OFFSET);
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data->remote_temp_offset_prec =
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i2c_smbus_read_byte_data(client,
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ADM1023_REG_REM_OFFSET_PREC);
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}
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data->last_updated = jiffies;
|
|
data->valid = 1;
|
|
}
|
|
|
|
mutex_unlock(&data->update_lock);
|
|
|
|
return data;
|
|
}
|
|
|
|
static int __init sensors_adm1021_init(void)
|
|
{
|
|
return i2c_add_driver(&adm1021_driver);
|
|
}
|
|
|
|
static void __exit sensors_adm1021_exit(void)
|
|
{
|
|
i2c_del_driver(&adm1021_driver);
|
|
}
|
|
|
|
MODULE_AUTHOR ("Frodo Looijaard <frodol@dds.nl> and "
|
|
"Philip Edelbrock <phil@netroedge.com>");
|
|
MODULE_DESCRIPTION("adm1021 driver");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_param(read_only, bool, 0);
|
|
MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");
|
|
|
|
module_init(sensors_adm1021_init)
|
|
module_exit(sensors_adm1021_exit)
|