diff options
Diffstat (limited to 'drivers/hwmon/adc128d818.c')
| -rw-r--r-- | drivers/hwmon/adc128d818.c | 491 |
1 files changed, 491 insertions, 0 deletions
diff --git a/drivers/hwmon/adc128d818.c b/drivers/hwmon/adc128d818.c new file mode 100644 index 000000000000..5ffd81f19d01 --- /dev/null +++ b/drivers/hwmon/adc128d818.c @@ -0,0 +1,491 @@ +/* + * Driver for TI ADC128D818 System Monitor with Temperature Sensor + * + * Copyright (c) 2014 Guenter Roeck + * + * Derived from lm80.c + * Copyright (C) 1998, 1999 Frodo Looijaard <frodol@dds.nl> + * and Philip Edelbrock <phil@netroedge.com> + * + * 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; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/jiffies.h> +#include <linux/i2c.h> +#include <linux/hwmon.h> +#include <linux/hwmon-sysfs.h> +#include <linux/err.h> +#include <linux/regulator/consumer.h> +#include <linux/mutex.h> + +/* Addresses to scan + * The chip also supports addresses 0x35..0x37. Don't scan those addresses + * since they are also used by some EEPROMs, which may result in false + * positives. + */ +static const unsigned short normal_i2c[] = { + 0x1d, 0x1e, 0x1f, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END }; + +/* registers */ +#define ADC128_REG_IN_MAX(nr) (0x2a + (nr) * 2) +#define ADC128_REG_IN_MIN(nr) (0x2b + (nr) * 2) +#define ADC128_REG_IN(nr) (0x20 + (nr)) + +#define ADC128_REG_TEMP 0x27 +#define ADC128_REG_TEMP_MAX 0x38 +#define ADC128_REG_TEMP_HYST 0x39 + +#define ADC128_REG_CONFIG 0x00 +#define ADC128_REG_ALARM 0x01 +#define ADC128_REG_MASK 0x03 +#define ADC128_REG_CONV_RATE 0x07 +#define ADC128_REG_ONESHOT 0x09 +#define ADC128_REG_SHUTDOWN 0x0a +#define ADC128_REG_CONFIG_ADV 0x0b +#define ADC128_REG_BUSY_STATUS 0x0c + +#define ADC128_REG_MAN_ID 0x3e +#define ADC128_REG_DEV_ID 0x3f + +struct adc128_data { + struct i2c_client *client; + struct regulator *regulator; + int vref; /* Reference voltage in mV */ + struct mutex update_lock; + bool valid; /* true if following fields are valid */ + unsigned long last_updated; /* In jiffies */ + + u16 in[3][7]; /* Register value, normalized to 12 bit + * 0: input voltage + * 1: min limit + * 2: max limit + */ + s16 temp[3]; /* Register value, normalized to 9 bit + * 0: sensor 1: limit 2: hyst + */ + u8 alarms; /* alarm register value */ +}; + +static struct adc128_data *adc128_update_device(struct device *dev) +{ + struct adc128_data *data = dev_get_drvdata(dev); + struct i2c_client *client = data->client; + struct adc128_data *ret = data; + int i, rv; + + mutex_lock(&data->update_lock); + + if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { + for (i = 0; i < 7; i++) { + rv = i2c_smbus_read_word_swapped(client, + ADC128_REG_IN(i)); + if (rv < 0) + goto abort; + data->in[0][i] = rv >> 4; + + rv = i2c_smbus_read_byte_data(client, + ADC128_REG_IN_MIN(i)); + if (rv < 0) + goto abort; + data->in[1][i] = rv << 4; + + rv = i2c_smbus_read_byte_data(client, + ADC128_REG_IN_MAX(i)); + if (rv < 0) + goto abort; + data->in[2][i] = rv << 4; + } + + rv = i2c_smbus_read_word_swapped(client, ADC128_REG_TEMP); + if (rv < 0) + goto abort; + data->temp[0] = rv >> 7; + + rv = i2c_smbus_read_byte_data(client, ADC128_REG_TEMP_MAX); + if (rv < 0) + goto abort; + data->temp[1] = rv << 1; + + rv = i2c_smbus_read_byte_data(client, ADC128_REG_TEMP_HYST); + if (rv < 0) + goto abort; + data->temp[2] = rv << 1; + + rv = i2c_smbus_read_byte_data(client, ADC128_REG_ALARM); + if (rv < 0) + goto abort; + data->alarms |= rv; + + data->last_updated = jiffies; + data->valid = true; + } + goto done; + +abort: + ret = ERR_PTR(rv); + data->valid = false; +done: + mutex_unlock(&data->update_lock); + return ret; +} + +static ssize_t adc128_show_in(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct adc128_data *data = adc128_update_device(dev); + int index = to_sensor_dev_attr_2(attr)->index; + int nr = to_sensor_dev_attr_2(attr)->nr; + int val; + + if (IS_ERR(data)) + return PTR_ERR(data); + + val = DIV_ROUND_CLOSEST(data->in[index][nr] * data->vref, 4095); + return sprintf(buf, "%d\n", val); +} + +static ssize_t adc128_set_in(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct adc128_data *data = dev_get_drvdata(dev); + int index = to_sensor_dev_attr_2(attr)->index; + int nr = to_sensor_dev_attr_2(attr)->nr; + u8 reg, regval; + long val; + int err; + + err = kstrtol(buf, 10, &val); + if (err < 0) + return err; + + mutex_lock(&data->update_lock); + /* 10 mV LSB on limit registers */ + regval = clamp_val(DIV_ROUND_CLOSEST(val, 10), 0, 255); + data->in[index][nr] = regval << 4; + reg = index == 1 ? ADC128_REG_IN_MIN(nr) : ADC128_REG_IN_MAX(nr); + i2c_smbus_write_byte_data(data->client, reg, regval); + mutex_unlock(&data->update_lock); + + return count; +} + +static ssize_t adc128_show_temp(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct adc128_data *data = adc128_update_device(dev); + int index = to_sensor_dev_attr(attr)->index; + int temp; + + if (IS_ERR(data)) + return PTR_ERR(data); + + temp = (data->temp[index] << 7) >> 7; /* sign extend */ + return sprintf(buf, "%d\n", temp * 500);/* 0.5 degrees C resolution */ +} + +static ssize_t adc128_set_temp(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct adc128_data *data = dev_get_drvdata(dev); + int index = to_sensor_dev_attr(attr)->index; + long val; + int err; + s8 regval; + + err = kstrtol(buf, 10, &val); + if (err < 0) + return err; + + mutex_lock(&data->update_lock); + regval = clamp_val(DIV_ROUND_CLOSEST(val, 1000), -128, 127); + data->temp[index] = regval << 1; + i2c_smbus_write_byte_data(data->client, + index == 1 ? ADC128_REG_TEMP_MAX + : ADC128_REG_TEMP_HYST, + regval); + mutex_unlock(&data->update_lock); + + return count; +} + +static ssize_t adc128_show_alarm(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct adc128_data *data = adc128_update_device(dev); + int mask = 1 << to_sensor_dev_attr(attr)->index; + u8 alarms; + + if (IS_ERR(data)) + return PTR_ERR(data); + + /* + * Clear an alarm after reporting it to user space. If it is still + * active, the next update sequence will set the alarm bit again. + */ + alarms = data->alarms; + data->alarms &= ~mask; + + return sprintf(buf, "%u\n", !!(alarms & mask)); +} + +static SENSOR_DEVICE_ATTR_2(in0_input, S_IWUSR | S_IRUGO, + adc128_show_in, adc128_set_in, 0, 0); +static SENSOR_DEVICE_ATTR_2(in0_min, S_IWUSR | S_IRUGO, + adc128_show_in, adc128_set_in, 0, 1); +static SENSOR_DEVICE_ATTR_2(in0_max, S_IWUSR | S_IRUGO, + adc128_show_in, adc128_set_in, 0, 2); + +static SENSOR_DEVICE_ATTR_2(in1_input, S_IWUSR | S_IRUGO, + adc128_show_in, adc128_set_in, 1, 0); +static SENSOR_DEVICE_ATTR_2(in1_min, S_IWUSR | S_IRUGO, + adc128_show_in, adc128_set_in, 1, 1); +static SENSOR_DEVICE_ATTR_2(in1_max, S_IWUSR | S_IRUGO, + adc128_show_in, adc128_set_in, 1, 2); + +static SENSOR_DEVICE_ATTR_2(in2_input, S_IWUSR | S_IRUGO, + adc128_show_in, adc128_set_in, 2, 0); +static SENSOR_DEVICE_ATTR_2(in2_min, S_IWUSR | S_IRUGO, + adc128_show_in, adc128_set_in, 2, 1); +static SENSOR_DEVICE_ATTR_2(in2_max, S_IWUSR | S_IRUGO, + adc128_show_in, adc128_set_in, 2, 2); + +static SENSOR_DEVICE_ATTR_2(in3_input, S_IWUSR | S_IRUGO, + adc128_show_in, adc128_set_in, 3, 0); +static SENSOR_DEVICE_ATTR_2(in3_min, S_IWUSR | S_IRUGO, + adc128_show_in, adc128_set_in, 3, 1); +static SENSOR_DEVICE_ATTR_2(in3_max, S_IWUSR | S_IRUGO, + adc128_show_in, adc128_set_in, 3, 2); + +static SENSOR_DEVICE_ATTR_2(in4_input, S_IWUSR | S_IRUGO, + adc128_show_in, adc128_set_in, 4, 0); +static SENSOR_DEVICE_ATTR_2(in4_min, S_IWUSR | S_IRUGO, + adc128_show_in, adc128_set_in, 4, 1); +static SENSOR_DEVICE_ATTR_2(in4_max, S_IWUSR | S_IRUGO, + adc128_show_in, adc128_set_in, 4, 2); + +static SENSOR_DEVICE_ATTR_2(in5_input, S_IWUSR | S_IRUGO, + adc128_show_in, adc128_set_in, 5, 0); +static SENSOR_DEVICE_ATTR_2(in5_min, S_IWUSR | S_IRUGO, + adc128_show_in, adc128_set_in, 5, 1); +static SENSOR_DEVICE_ATTR_2(in5_max, S_IWUSR | S_IRUGO, + adc128_show_in, adc128_set_in, 5, 2); + +static SENSOR_DEVICE_ATTR_2(in6_input, S_IWUSR | S_IRUGO, + adc128_show_in, adc128_set_in, 6, 0); +static SENSOR_DEVICE_ATTR_2(in6_min, S_IWUSR | S_IRUGO, + adc128_show_in, adc128_set_in, 6, 1); +static SENSOR_DEVICE_ATTR_2(in6_max, S_IWUSR | S_IRUGO, + adc128_show_in, adc128_set_in, 6, 2); + +static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, adc128_show_temp, NULL, 0); +static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, + adc128_show_temp, adc128_set_temp, 1); +static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, + adc128_show_temp, adc128_set_temp, 2); + +static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, adc128_show_alarm, NULL, 0); +static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, adc128_show_alarm, NULL, 1); +static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, adc128_show_alarm, NULL, 2); +static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, adc128_show_alarm, NULL, 3); +static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, adc128_show_alarm, NULL, 4); +static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, adc128_show_alarm, NULL, 5); +static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, adc128_show_alarm, NULL, 6); +static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, adc128_show_alarm, NULL, 7); + +static struct attribute *adc128_attrs[] = { + &sensor_dev_attr_in0_min.dev_attr.attr, + &sensor_dev_attr_in1_min.dev_attr.attr, + &sensor_dev_attr_in2_min.dev_attr.attr, + &sensor_dev_attr_in3_min.dev_attr.attr, + &sensor_dev_attr_in4_min.dev_attr.attr, + &sensor_dev_attr_in5_min.dev_attr.attr, + &sensor_dev_attr_in6_min.dev_attr.attr, + &sensor_dev_attr_in0_max.dev_attr.attr, + &sensor_dev_attr_in1_max.dev_attr.attr, + &sensor_dev_attr_in2_max.dev_attr.attr, + &sensor_dev_attr_in3_max.dev_attr.attr, + &sensor_dev_attr_in4_max.dev_attr.attr, + &sensor_dev_attr_in5_max.dev_attr.attr, + &sensor_dev_attr_in6_max.dev_attr.attr, + &sensor_dev_attr_in0_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, + &sensor_dev_attr_in5_input.dev_attr.attr, + &sensor_dev_attr_in6_input.dev_attr.attr, + &sensor_dev_attr_temp1_input.dev_attr.attr, + &sensor_dev_attr_temp1_max.dev_attr.attr, + &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, + &sensor_dev_attr_in0_alarm.dev_attr.attr, + &sensor_dev_attr_in1_alarm.dev_attr.attr, + &sensor_dev_attr_in2_alarm.dev_attr.attr, + &sensor_dev_attr_in3_alarm.dev_attr.attr, + &sensor_dev_attr_in4_alarm.dev_attr.attr, + &sensor_dev_attr_in5_alarm.dev_attr.attr, + &sensor_dev_attr_in6_alarm.dev_attr.attr, + &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, + NULL +}; +ATTRIBUTE_GROUPS(adc128); + +static int adc128_detect(struct i2c_client *client, struct i2c_board_info *info) +{ + int man_id, dev_id; + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_BYTE_DATA | + I2C_FUNC_SMBUS_WORD_DATA)) + return -ENODEV; + + man_id = i2c_smbus_read_byte_data(client, ADC128_REG_MAN_ID); + dev_id = i2c_smbus_read_byte_data(client, ADC128_REG_DEV_ID); + if (man_id != 0x01 || dev_id != 0x09) + return -ENODEV; + + /* Check unused bits for confirmation */ + if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG) & 0xf4) + return -ENODEV; + if (i2c_smbus_read_byte_data(client, ADC128_REG_CONV_RATE) & 0xfe) + return -ENODEV; + if (i2c_smbus_read_byte_data(client, ADC128_REG_ONESHOT) & 0xfe) + return -ENODEV; + if (i2c_smbus_read_byte_data(client, ADC128_REG_SHUTDOWN) & 0xfe) + return -ENODEV; + if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV) & 0xf8) + return -ENODEV; + if (i2c_smbus_read_byte_data(client, ADC128_REG_BUSY_STATUS) & 0xfc) + return -ENODEV; + + strlcpy(info->type, "adc128d818", I2C_NAME_SIZE); + + return 0; +} + +static int adc128_init_client(struct adc128_data *data) +{ + struct i2c_client *client = data->client; + int err; + + /* + * Reset chip to defaults. + * This makes most other initializations unnecessary. + */ + err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x80); + if (err) + return err; + + /* Start monitoring */ + err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x01); + if (err) + return err; + + /* If external vref is selected, configure the chip to use it */ + if (data->regulator) { + err = i2c_smbus_write_byte_data(client, + ADC128_REG_CONFIG_ADV, 0x01); + if (err) + return err; + } + + return 0; +} + +static int adc128_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct device *dev = &client->dev; + struct regulator *regulator; + struct device *hwmon_dev; + struct adc128_data *data; + int err, vref; + + data = devm_kzalloc(dev, sizeof(struct adc128_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + /* vref is optional. If specified, is used as chip reference voltage */ + regulator = devm_regulator_get_optional(dev, "vref"); + if (!IS_ERR(regulator)) { + data->regulator = regulator; + err = regulator_enable(regulator); + if (err < 0) + return err; + vref = regulator_get_voltage(regulator); + if (vref < 0) { + err = vref; + goto error; + } + data->vref = DIV_ROUND_CLOSEST(vref, 1000); + } else { + data->vref = 2560; /* 2.56V, in mV */ + } + + data->client = client; + i2c_set_clientdata(client, data); + mutex_init(&data->update_lock); + + /* Initialize the chip */ + err = adc128_init_client(data); + if (err < 0) + goto error; + + hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, + data, adc128_groups); + if (IS_ERR(hwmon_dev)) { + err = PTR_ERR(hwmon_dev); + goto error; + } + + return 0; + +error: + if (data->regulator) + regulator_disable(data->regulator); + return err; +} + +static int adc128_remove(struct i2c_client *client) +{ + struct adc128_data *data = i2c_get_clientdata(client); + + if (data->regulator) + regulator_disable(data->regulator); + + return 0; +} + +static const struct i2c_device_id adc128_id[] = { + { "adc128d818", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, adc128_id); + +static struct i2c_driver adc128_driver = { + .class = I2C_CLASS_HWMON, + .driver = { + .name = "adc128d818", + }, + .probe = adc128_probe, + .remove = adc128_remove, + .id_table = adc128_id, + .detect = adc128_detect, + .address_list = normal_i2c, +}; + +module_i2c_driver(adc128_driver); + +MODULE_AUTHOR("Guenter Roeck"); +MODULE_DESCRIPTION("Driver for ADC128D818"); +MODULE_LICENSE("GPL"); |