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317 lines
8.1 KiB
317 lines
8.1 KiB
/*
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* An hwmon driver for the Analog Devices AD7416/17/18
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* Copyright (C) 2006-07 Tower Technologies
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*
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* Author: Alessandro Zummo <a.zummo@towertech.it>
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*
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* Based on lm75.c
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* Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl>
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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,
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* as published by the Free Software Foundation - version 2.
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*/
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#include <linux/module.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/delay.h>
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#include <linux/slab.h>
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#include "lm75.h"
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#define DRV_VERSION "0.4"
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enum chips { ad7416, ad7417, ad7418 };
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/* AD7418 registers */
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#define AD7418_REG_TEMP_IN 0x00
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#define AD7418_REG_CONF 0x01
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#define AD7418_REG_TEMP_HYST 0x02
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#define AD7418_REG_TEMP_OS 0x03
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#define AD7418_REG_ADC 0x04
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#define AD7418_REG_CONF2 0x05
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#define AD7418_REG_ADC_CH(x) ((x) << 5)
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#define AD7418_CH_TEMP AD7418_REG_ADC_CH(0)
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static const u8 AD7418_REG_TEMP[] = { AD7418_REG_TEMP_IN,
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AD7418_REG_TEMP_HYST,
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AD7418_REG_TEMP_OS };
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struct ad7418_data {
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struct device *hwmon_dev;
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struct attribute_group attrs;
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enum chips type;
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struct mutex lock;
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int adc_max; /* number of ADC channels */
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char valid;
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unsigned long last_updated; /* In jiffies */
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s16 temp[3]; /* Register values */
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u16 in[4];
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};
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static int ad7418_probe(struct i2c_client *client,
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const struct i2c_device_id *id);
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static int ad7418_remove(struct i2c_client *client);
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static const struct i2c_device_id ad7418_id[] = {
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{ "ad7416", ad7416 },
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{ "ad7417", ad7417 },
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{ "ad7418", ad7418 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ad7418_id);
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static struct i2c_driver ad7418_driver = {
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.driver = {
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.name = "ad7418",
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},
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.probe = ad7418_probe,
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.remove = ad7418_remove,
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.id_table = ad7418_id,
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};
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/* All registers are word-sized, except for the configuration registers.
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* AD7418 uses a high-byte first convention. Do NOT use those functions to
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* access the configuration registers CONF and CONF2, as they are byte-sized.
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*/
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static inline int ad7418_read(struct i2c_client *client, u8 reg)
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{
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return swab16(i2c_smbus_read_word_data(client, reg));
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}
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static inline int ad7418_write(struct i2c_client *client, u8 reg, u16 value)
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{
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return i2c_smbus_write_word_data(client, reg, swab16(value));
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}
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static void ad7418_init_client(struct i2c_client *client)
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{
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struct ad7418_data *data = i2c_get_clientdata(client);
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int reg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF);
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if (reg < 0) {
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dev_err(&client->dev, "cannot read configuration register\n");
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} else {
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dev_info(&client->dev, "configuring for mode 1\n");
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i2c_smbus_write_byte_data(client, AD7418_REG_CONF, reg & 0xfe);
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if (data->type == ad7417 || data->type == ad7418)
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i2c_smbus_write_byte_data(client,
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AD7418_REG_CONF2, 0x00);
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}
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}
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static struct ad7418_data *ad7418_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 ad7418_data *data = i2c_get_clientdata(client);
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mutex_lock(&data->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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u8 cfg;
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int i, ch;
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/* read config register and clear channel bits */
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cfg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF);
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cfg &= 0x1F;
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i2c_smbus_write_byte_data(client, AD7418_REG_CONF,
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cfg | AD7418_CH_TEMP);
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udelay(30);
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for (i = 0; i < 3; i++) {
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data->temp[i] = ad7418_read(client, AD7418_REG_TEMP[i]);
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}
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for (i = 0, ch = 4; i < data->adc_max; i++, ch--) {
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i2c_smbus_write_byte_data(client,
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AD7418_REG_CONF,
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cfg | AD7418_REG_ADC_CH(ch));
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udelay(15);
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data->in[data->adc_max - 1 - i] =
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ad7418_read(client, AD7418_REG_ADC);
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}
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/* restore old configuration value */
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ad7418_write(client, AD7418_REG_CONF, cfg);
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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->lock);
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return data;
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}
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static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct ad7418_data *data = ad7418_update_device(dev);
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return sprintf(buf, "%d\n",
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LM75_TEMP_FROM_REG(data->temp[attr->index]));
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}
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static ssize_t show_adc(struct device *dev, struct device_attribute *devattr,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct ad7418_data *data = ad7418_update_device(dev);
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return sprintf(buf, "%d\n",
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((data->in[attr->index] >> 6) * 2500 + 512) / 1024);
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}
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static ssize_t set_temp(struct device *dev, struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct i2c_client *client = to_i2c_client(dev);
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struct ad7418_data *data = i2c_get_clientdata(client);
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long temp = simple_strtol(buf, NULL, 10);
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mutex_lock(&data->lock);
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data->temp[attr->index] = LM75_TEMP_TO_REG(temp);
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ad7418_write(client, AD7418_REG_TEMP[attr->index], data->temp[attr->index]);
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mutex_unlock(&data->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_hyst, S_IWUSR | S_IRUGO,
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show_temp, set_temp, 1);
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static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
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show_temp, set_temp, 2);
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static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_adc, NULL, 0);
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static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_adc, NULL, 1);
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static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_adc, NULL, 2);
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static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_adc, NULL, 3);
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static struct attribute *ad7416_attributes[] = {
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&sensor_dev_attr_temp1_max.dev_attr.attr,
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&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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NULL
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};
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static struct attribute *ad7417_attributes[] = {
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&sensor_dev_attr_temp1_max.dev_attr.attr,
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&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_in1_input.dev_attr.attr,
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&sensor_dev_attr_in2_input.dev_attr.attr,
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&sensor_dev_attr_in3_input.dev_attr.attr,
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&sensor_dev_attr_in4_input.dev_attr.attr,
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NULL
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};
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static struct attribute *ad7418_attributes[] = {
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&sensor_dev_attr_temp1_max.dev_attr.attr,
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&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_in1_input.dev_attr.attr,
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NULL
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};
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static int ad7418_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct i2c_adapter *adapter = client->adapter;
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struct ad7418_data *data;
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int err;
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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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err = -EOPNOTSUPP;
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goto exit;
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}
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if (!(data = kzalloc(sizeof(struct ad7418_data), GFP_KERNEL))) {
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err = -ENOMEM;
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goto exit;
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}
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i2c_set_clientdata(client, data);
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mutex_init(&data->lock);
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data->type = id->driver_data;
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switch (data->type) {
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case ad7416:
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data->adc_max = 0;
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data->attrs.attrs = ad7416_attributes;
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break;
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case ad7417:
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data->adc_max = 4;
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data->attrs.attrs = ad7417_attributes;
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break;
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case ad7418:
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data->adc_max = 1;
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data->attrs.attrs = ad7418_attributes;
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break;
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}
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dev_info(&client->dev, "%s chip found\n", client->name);
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/* Initialize the AD7418 chip */
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ad7418_init_client(client);
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/* Register sysfs hooks */
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if ((err = sysfs_create_group(&client->dev.kobj, &data->attrs)))
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goto exit_free;
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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 exit_remove;
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}
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return 0;
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exit_remove:
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sysfs_remove_group(&client->dev.kobj, &data->attrs);
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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 int ad7418_remove(struct i2c_client *client)
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{
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struct ad7418_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, &data->attrs);
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kfree(data);
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return 0;
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}
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static int __init ad7418_init(void)
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{
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return i2c_add_driver(&ad7418_driver);
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}
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static void __exit ad7418_exit(void)
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{
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i2c_del_driver(&ad7418_driver);
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}
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MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
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MODULE_DESCRIPTION("AD7416/17/18 driver");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(DRV_VERSION);
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module_init(ad7418_init);
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module_exit(ad7418_exit);
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