diff options
| -rw-r--r-- | drivers/hwmon/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/hwmon/Makefile | 1 | ||||
| -rw-r--r-- | drivers/hwmon/ad7418.c | 373 |
3 files changed, 384 insertions, 0 deletions
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index e488d691da4..1691c6c7bbc 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -39,6 +39,16 @@ config SENSORS_ABITUGURU This driver can also be built as a module. If so, the module will be called abituguru. +config SENSORS_AD7418 + tristate "Analog Devices AD7416, AD7417 and AD7418" + depends on HWMON && I2C && EXPERIMENTAL + help + If you say yes here you get support for the Analog Devices + AD7416, AD7417 and AD7418 temperature monitoring chips. + + This driver can also be built as a module. If so, the module + will be called ad7418. + config SENSORS_ADM1021 tristate "Analog Devices ADM1021 and compatibles" depends on HWMON && I2C diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index 33780678bd4..d83f2380e08 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -14,6 +14,7 @@ obj-$(CONFIG_SENSORS_W83781D) += w83781d.o obj-$(CONFIG_SENSORS_W83791D) += w83791d.o obj-$(CONFIG_SENSORS_ABITUGURU) += abituguru.o +obj-$(CONFIG_SENSORS_AD7418) += ad7418.o obj-$(CONFIG_SENSORS_ADM1021) += adm1021.o obj-$(CONFIG_SENSORS_ADM1025) += adm1025.o obj-$(CONFIG_SENSORS_ADM1026) += adm1026.o diff --git a/drivers/hwmon/ad7418.c b/drivers/hwmon/ad7418.c new file mode 100644 index 00000000000..cc8b624a1e5 --- /dev/null +++ b/drivers/hwmon/ad7418.c @@ -0,0 +1,373 @@ +/* + * 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 class_device *class_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); + int 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->class_dev = hwmon_device_register(&client->dev); + if (IS_ERR(data->class_dev)) { + err = PTR_ERR(data->class_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->class_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); |