/* * 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);