diff options
Diffstat (limited to 'drivers/hwmon/ad7418.c')
| -rw-r--r-- | drivers/hwmon/ad7418.c | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/drivers/hwmon/ad7418.c b/drivers/hwmon/ad7418.c new file mode 100644 index 000000000..a01b731ba --- /dev/null +++ b/drivers/hwmon/ad7418.c @@ -0,0 +1,275 @@ +/* + * 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 <linux/slab.h> + +#include "lm75.h" + +#define DRV_VERSION "0.4" + +enum chips { 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; + 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 struct ad7418_data *ad7418_update_device(struct device *dev) +{ + struct ad7418_data *data = dev_get_drvdata(dev); + struct i2c_client *client = data->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] = + i2c_smbus_read_word_swapped(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] = + i2c_smbus_read_word_swapped(client, + AD7418_REG_ADC); + } + + /* restore old configuration value */ + i2c_smbus_write_word_swapped(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 ad7418_data *data = dev_get_drvdata(dev); + struct i2c_client *client = data->client; + long temp; + int ret = kstrtol(buf, 10, &temp); + + if (ret < 0) + return ret; + + mutex_lock(&data->lock); + data->temp[attr->index] = LM75_TEMP_TO_REG(temp); + i2c_smbus_write_word_swapped(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 struct attribute *ad7416_attrs[] = { + &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 +}; +ATTRIBUTE_GROUPS(ad7416); + +static struct attribute *ad7417_attrs[] = { + &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 +}; +ATTRIBUTE_GROUPS(ad7417); + +static struct attribute *ad7418_attrs[] = { + &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 +}; +ATTRIBUTE_GROUPS(ad7418); + +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 int ad7418_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct device *dev = &client->dev; + struct i2c_adapter *adapter = client->adapter; + struct ad7418_data *data; + struct device *hwmon_dev; + const struct attribute_group **attr_groups = NULL; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | + I2C_FUNC_SMBUS_WORD_DATA)) + return -EOPNOTSUPP; + + data = devm_kzalloc(dev, sizeof(struct ad7418_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + i2c_set_clientdata(client, data); + + mutex_init(&data->lock); + data->client = client; + data->type = id->driver_data; + + switch (data->type) { + case ad7416: + data->adc_max = 0; + attr_groups = ad7416_groups; + break; + + case ad7417: + data->adc_max = 4; + attr_groups = ad7417_groups; + break; + + case ad7418: + data->adc_max = 1; + attr_groups = ad7418_groups; + break; + } + + dev_info(dev, "%s chip found\n", client->name); + + /* Initialize the AD7418 chip */ + ad7418_init_client(client); + + hwmon_dev = devm_hwmon_device_register_with_groups(dev, + client->name, + data, attr_groups); + return PTR_ERR_OR_ZERO(hwmon_dev); +} + +static const struct i2c_device_id ad7418_id[] = { + { "ad7416", ad7416 }, + { "ad7417", ad7417 }, + { "ad7418", ad7418 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, ad7418_id); + +static struct i2c_driver ad7418_driver = { + .driver = { + .name = "ad7418", + }, + .probe = ad7418_probe, + .id_table = ad7418_id, +}; + +module_i2c_driver(ad7418_driver); + +MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); +MODULE_DESCRIPTION("AD7416/17/18 driver"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(DRV_VERSION); |