mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Tony Jones](/assets/img/avatar_default.png)
Convert from class_device to device for hwmon_device_register/unregister Signed-off-by: Tony Jones <tonyj@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>
373 lines
9.8 KiB
C
373 lines
9.8 KiB
C
/*
|
|
* An hwmon driver for the Analog Devices AD7416/17/18
|
|
* Copyright (C) 2006-07 Tower Technologies
|
|
*
|
|
* Author: Alessandro Zummo <a.zummo@towertech.it>
|
|
*
|
|
* Based on lm75.c
|
|
* Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License,
|
|
* as published by the Free Software Foundation - version 2.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/jiffies.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/hwmon.h>
|
|
#include <linux/hwmon-sysfs.h>
|
|
#include <linux/err.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/delay.h>
|
|
|
|
#include "lm75.h"
|
|
|
|
#define DRV_VERSION "0.3"
|
|
|
|
/* Addresses to scan */
|
|
static unsigned short normal_i2c[] = { 0x28, I2C_CLIENT_END };
|
|
/* Insmod parameters */
|
|
I2C_CLIENT_INSMOD_3(ad7416, ad7417, ad7418);
|
|
|
|
/* AD7418 registers */
|
|
#define AD7418_REG_TEMP_IN 0x00
|
|
#define AD7418_REG_CONF 0x01
|
|
#define AD7418_REG_TEMP_HYST 0x02
|
|
#define AD7418_REG_TEMP_OS 0x03
|
|
#define AD7418_REG_ADC 0x04
|
|
#define AD7418_REG_CONF2 0x05
|
|
|
|
#define AD7418_REG_ADC_CH(x) ((x) << 5)
|
|
#define AD7418_CH_TEMP AD7418_REG_ADC_CH(0)
|
|
|
|
static const u8 AD7418_REG_TEMP[] = { AD7418_REG_TEMP_IN,
|
|
AD7418_REG_TEMP_HYST,
|
|
AD7418_REG_TEMP_OS };
|
|
|
|
struct ad7418_data {
|
|
struct i2c_client client;
|
|
struct device *hwmon_dev;
|
|
struct attribute_group attrs;
|
|
enum chips type;
|
|
struct mutex lock;
|
|
int adc_max; /* number of ADC channels */
|
|
char valid;
|
|
unsigned long last_updated; /* In jiffies */
|
|
s16 temp[3]; /* Register values */
|
|
u16 in[4];
|
|
};
|
|
|
|
static int ad7418_attach_adapter(struct i2c_adapter *adapter);
|
|
static int ad7418_detect(struct i2c_adapter *adapter, int address, int kind);
|
|
static int ad7418_detach_client(struct i2c_client *client);
|
|
|
|
static struct i2c_driver ad7418_driver = {
|
|
.driver = {
|
|
.name = "ad7418",
|
|
},
|
|
.attach_adapter = ad7418_attach_adapter,
|
|
.detach_client = ad7418_detach_client,
|
|
};
|
|
|
|
/* All registers are word-sized, except for the configuration registers.
|
|
* AD7418 uses a high-byte first convention. Do NOT use those functions to
|
|
* access the configuration registers CONF and CONF2, as they are byte-sized.
|
|
*/
|
|
static inline int ad7418_read(struct i2c_client *client, u8 reg)
|
|
{
|
|
return swab16(i2c_smbus_read_word_data(client, reg));
|
|
}
|
|
|
|
static inline int ad7418_write(struct i2c_client *client, u8 reg, u16 value)
|
|
{
|
|
return i2c_smbus_write_word_data(client, reg, swab16(value));
|
|
}
|
|
|
|
static void ad7418_init_client(struct i2c_client *client)
|
|
{
|
|
struct ad7418_data *data = i2c_get_clientdata(client);
|
|
|
|
int reg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF);
|
|
if (reg < 0) {
|
|
dev_err(&client->dev, "cannot read configuration register\n");
|
|
} else {
|
|
dev_info(&client->dev, "configuring for mode 1\n");
|
|
i2c_smbus_write_byte_data(client, AD7418_REG_CONF, reg & 0xfe);
|
|
|
|
if (data->type == ad7417 || data->type == ad7418)
|
|
i2c_smbus_write_byte_data(client,
|
|
AD7418_REG_CONF2, 0x00);
|
|
}
|
|
}
|
|
|
|
static struct ad7418_data *ad7418_update_device(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct ad7418_data *data = i2c_get_clientdata(client);
|
|
|
|
mutex_lock(&data->lock);
|
|
|
|
if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
|
|
|| !data->valid) {
|
|
u8 cfg;
|
|
int i, ch;
|
|
|
|
/* read config register and clear channel bits */
|
|
cfg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF);
|
|
cfg &= 0x1F;
|
|
|
|
i2c_smbus_write_byte_data(client, AD7418_REG_CONF,
|
|
cfg | AD7418_CH_TEMP);
|
|
udelay(30);
|
|
|
|
for (i = 0; i < 3; i++) {
|
|
data->temp[i] = ad7418_read(client, AD7418_REG_TEMP[i]);
|
|
}
|
|
|
|
for (i = 0, ch = 4; i < data->adc_max; i++, ch--) {
|
|
i2c_smbus_write_byte_data(client,
|
|
AD7418_REG_CONF,
|
|
cfg | AD7418_REG_ADC_CH(ch));
|
|
|
|
udelay(15);
|
|
data->in[data->adc_max - 1 - i] =
|
|
ad7418_read(client, AD7418_REG_ADC);
|
|
}
|
|
|
|
/* restore old configuration value */
|
|
ad7418_write(client, AD7418_REG_CONF, cfg);
|
|
|
|
data->last_updated = jiffies;
|
|
data->valid = 1;
|
|
}
|
|
|
|
mutex_unlock(&data->lock);
|
|
|
|
return data;
|
|
}
|
|
|
|
static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
|
|
char *buf)
|
|
{
|
|
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
|
|
struct ad7418_data *data = ad7418_update_device(dev);
|
|
return sprintf(buf, "%d\n",
|
|
LM75_TEMP_FROM_REG(data->temp[attr->index]));
|
|
}
|
|
|
|
static ssize_t show_adc(struct device *dev, struct device_attribute *devattr,
|
|
char *buf)
|
|
{
|
|
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
|
|
struct ad7418_data *data = ad7418_update_device(dev);
|
|
|
|
return sprintf(buf, "%d\n",
|
|
((data->in[attr->index] >> 6) * 2500 + 512) / 1024);
|
|
}
|
|
|
|
static ssize_t set_temp(struct device *dev, struct device_attribute *devattr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct ad7418_data *data = i2c_get_clientdata(client);
|
|
long temp = simple_strtol(buf, NULL, 10);
|
|
|
|
mutex_lock(&data->lock);
|
|
data->temp[attr->index] = LM75_TEMP_TO_REG(temp);
|
|
ad7418_write(client, AD7418_REG_TEMP[attr->index], data->temp[attr->index]);
|
|
mutex_unlock(&data->lock);
|
|
return count;
|
|
}
|
|
|
|
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
|
|
static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
|
|
show_temp, set_temp, 1);
|
|
static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
|
|
show_temp, set_temp, 2);
|
|
|
|
static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_adc, NULL, 0);
|
|
static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_adc, NULL, 1);
|
|
static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_adc, NULL, 2);
|
|
static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_adc, NULL, 3);
|
|
|
|
static int ad7418_attach_adapter(struct i2c_adapter *adapter)
|
|
{
|
|
if (!(adapter->class & I2C_CLASS_HWMON))
|
|
return 0;
|
|
return i2c_probe(adapter, &addr_data, ad7418_detect);
|
|
}
|
|
|
|
static struct attribute *ad7416_attributes[] = {
|
|
&sensor_dev_attr_temp1_max.dev_attr.attr,
|
|
&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
|
|
&sensor_dev_attr_temp1_input.dev_attr.attr,
|
|
NULL
|
|
};
|
|
|
|
static struct attribute *ad7417_attributes[] = {
|
|
&sensor_dev_attr_temp1_max.dev_attr.attr,
|
|
&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
|
|
&sensor_dev_attr_temp1_input.dev_attr.attr,
|
|
&sensor_dev_attr_in1_input.dev_attr.attr,
|
|
&sensor_dev_attr_in2_input.dev_attr.attr,
|
|
&sensor_dev_attr_in3_input.dev_attr.attr,
|
|
&sensor_dev_attr_in4_input.dev_attr.attr,
|
|
NULL
|
|
};
|
|
|
|
static struct attribute *ad7418_attributes[] = {
|
|
&sensor_dev_attr_temp1_max.dev_attr.attr,
|
|
&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
|
|
&sensor_dev_attr_temp1_input.dev_attr.attr,
|
|
&sensor_dev_attr_in1_input.dev_attr.attr,
|
|
NULL
|
|
};
|
|
|
|
static int ad7418_detect(struct i2c_adapter *adapter, int address, int kind)
|
|
{
|
|
struct i2c_client *client;
|
|
struct ad7418_data *data;
|
|
int err = 0;
|
|
|
|
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
|
|
I2C_FUNC_SMBUS_WORD_DATA))
|
|
goto exit;
|
|
|
|
if (!(data = kzalloc(sizeof(struct ad7418_data), GFP_KERNEL))) {
|
|
err = -ENOMEM;
|
|
goto exit;
|
|
}
|
|
|
|
client = &data->client;
|
|
client->addr = address;
|
|
client->adapter = adapter;
|
|
client->driver = &ad7418_driver;
|
|
|
|
i2c_set_clientdata(client, data);
|
|
|
|
mutex_init(&data->lock);
|
|
|
|
/* AD7418 has a curious behaviour on registers 6 and 7. They
|
|
* both always read 0xC071 and are not documented on the datasheet.
|
|
* We use them to detect the chip.
|
|
*/
|
|
if (kind <= 0) {
|
|
int reg, reg6, reg7;
|
|
|
|
/* the AD7416 lies within this address range, but I have
|
|
* no means to check.
|
|
*/
|
|
if (address >= 0x48 && address <= 0x4f) {
|
|
/* XXX add tests for AD7416 here */
|
|
/* data->type = ad7416; */
|
|
}
|
|
/* here we might have AD7417 or AD7418 */
|
|
else if (address >= 0x28 && address <= 0x2f) {
|
|
reg6 = i2c_smbus_read_word_data(client, 0x06);
|
|
reg7 = i2c_smbus_read_word_data(client, 0x07);
|
|
|
|
if (address == 0x28 && reg6 == 0xC071 && reg7 == 0xC071)
|
|
data->type = ad7418;
|
|
|
|
/* XXX add tests for AD7417 here */
|
|
|
|
|
|
/* both AD7417 and AD7418 have bits 0-5 of
|
|
* the CONF2 register at 0
|
|
*/
|
|
reg = i2c_smbus_read_byte_data(client,
|
|
AD7418_REG_CONF2);
|
|
if (reg & 0x3F)
|
|
data->type = any_chip; /* detection failed */
|
|
}
|
|
} else {
|
|
dev_dbg(&adapter->dev, "detection forced\n");
|
|
}
|
|
|
|
if (kind > 0)
|
|
data->type = kind;
|
|
else if (kind < 0 && data->type == any_chip) {
|
|
err = -ENODEV;
|
|
goto exit_free;
|
|
}
|
|
|
|
switch (data->type) {
|
|
case any_chip:
|
|
case ad7416:
|
|
data->adc_max = 0;
|
|
data->attrs.attrs = ad7416_attributes;
|
|
strlcpy(client->name, "ad7416", I2C_NAME_SIZE);
|
|
break;
|
|
|
|
case ad7417:
|
|
data->adc_max = 4;
|
|
data->attrs.attrs = ad7417_attributes;
|
|
strlcpy(client->name, "ad7417", I2C_NAME_SIZE);
|
|
break;
|
|
|
|
case ad7418:
|
|
data->adc_max = 1;
|
|
data->attrs.attrs = ad7418_attributes;
|
|
strlcpy(client->name, "ad7418", I2C_NAME_SIZE);
|
|
break;
|
|
}
|
|
|
|
if ((err = i2c_attach_client(client)))
|
|
goto exit_free;
|
|
|
|
dev_info(&client->dev, "%s chip found\n", client->name);
|
|
|
|
/* Initialize the AD7418 chip */
|
|
ad7418_init_client(client);
|
|
|
|
/* Register sysfs hooks */
|
|
if ((err = sysfs_create_group(&client->dev.kobj, &data->attrs)))
|
|
goto exit_detach;
|
|
|
|
data->hwmon_dev = hwmon_device_register(&client->dev);
|
|
if (IS_ERR(data->hwmon_dev)) {
|
|
err = PTR_ERR(data->hwmon_dev);
|
|
goto exit_remove;
|
|
}
|
|
|
|
return 0;
|
|
|
|
exit_remove:
|
|
sysfs_remove_group(&client->dev.kobj, &data->attrs);
|
|
exit_detach:
|
|
i2c_detach_client(client);
|
|
exit_free:
|
|
kfree(data);
|
|
exit:
|
|
return err;
|
|
}
|
|
|
|
static int ad7418_detach_client(struct i2c_client *client)
|
|
{
|
|
struct ad7418_data *data = i2c_get_clientdata(client);
|
|
hwmon_device_unregister(data->hwmon_dev);
|
|
sysfs_remove_group(&client->dev.kobj, &data->attrs);
|
|
i2c_detach_client(client);
|
|
kfree(data);
|
|
return 0;
|
|
}
|
|
|
|
static int __init ad7418_init(void)
|
|
{
|
|
return i2c_add_driver(&ad7418_driver);
|
|
}
|
|
|
|
static void __exit ad7418_exit(void)
|
|
{
|
|
i2c_del_driver(&ad7418_driver);
|
|
}
|
|
|
|
MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
|
|
MODULE_DESCRIPTION("AD7416/17/18 driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_VERSION(DRV_VERSION);
|
|
|
|
module_init(ad7418_init);
|
|
module_exit(ad7418_exit);
|