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drivers/hwmon/ad7418.c
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/* * 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> |
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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 */ #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 { |
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struct device *hwmon_dev; |
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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]; }; |
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static int ad7418_probe(struct i2c_client *client, const struct i2c_device_id *id); static int ad7418_remove(struct i2c_client *client); static const struct i2c_device_id ad7418_id[] = { { "ad7416", ad7416 }, { "ad7417", ad7417 }, { "ad7418", ad7418 }, { } }; MODULE_DEVICE_TABLE(i2c, ad7418_id); |
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static struct i2c_driver ad7418_driver = { .driver = { .name = "ad7418", }, |
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.probe = ad7418_probe, .remove = ad7418_remove, .id_table = ad7418_id, |
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}; |
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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 "); } else { dev_info(&client->dev, "configuring for mode 1 "); 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++) { |
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data->temp[i] = i2c_smbus_read_word_swapped(client, AD7418_REG_TEMP[i]); |
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} 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] = |
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i2c_smbus_read_word_swapped(client, AD7418_REG_ADC); |
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} /* restore old configuration value */ |
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i2c_smbus_write_word_swapped(client, AD7418_REG_CONF, cfg); |
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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 ", 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 ", ((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); |
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long temp = simple_strtol(buf, NULL, 10); |
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mutex_lock(&data->lock); data->temp[attr->index] = LM75_TEMP_TO_REG(temp); |
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i2c_smbus_write_word_swapped(client, AD7418_REG_TEMP[attr->index], data->temp[attr->index]); |
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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); |
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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 }; |
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static int ad7418_probe(struct i2c_client *client, 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)) { 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))) { err = -ENOMEM; goto exit; } |
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i2c_set_clientdata(client, data); 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: data->adc_max = 0; data->attrs.attrs = ad7416_attributes; |
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break; case ad7417: data->adc_max = 4; data->attrs.attrs = ad7417_attributes; |
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break; case ad7418: data->adc_max = 1; data->attrs.attrs = ad7418_attributes; |
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break; } |
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dev_info(&client->dev, "%s chip found ", client->name); /* Initialize the AD7418 chip */ ad7418_init_client(client); /* Register sysfs hooks */ 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); if (IS_ERR(data->hwmon_dev)) { err = PTR_ERR(data->hwmon_dev); |
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goto exit_remove; } return 0; exit_remove: sysfs_remove_group(&client->dev.kobj, &data->attrs); |
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exit_free: kfree(data); exit: return err; } |
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static int ad7418_remove(struct i2c_client *client) |
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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); 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); |