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2c3b1189fd
data->temp[index] has type s16. Because of C's promotion rules, (data->temp[index] << 7) >> 7 is exactly the same as data->temp[index]. The intention was to use bit 8 as a sign bit, so do that using the existing API. Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
493 lines
14 KiB
C
493 lines
14 KiB
C
/*
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* Driver for TI ADC128D818 System Monitor with Temperature Sensor
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*
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* Copyright (c) 2014 Guenter Roeck
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*
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* Derived from lm80.c
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* Copyright (C) 1998, 1999 Frodo Looijaard <frodol@dds.nl>
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* and Philip Edelbrock <phil@netroedge.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/jiffies.h>
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#include <linux/i2c.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/err.h>
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#include <linux/regulator/consumer.h>
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#include <linux/mutex.h>
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#include <linux/bitops.h>
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/* Addresses to scan
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* The chip also supports addresses 0x35..0x37. Don't scan those addresses
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* since they are also used by some EEPROMs, which may result in false
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* positives.
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*/
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static const unsigned short normal_i2c[] = {
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0x1d, 0x1e, 0x1f, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END };
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/* registers */
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#define ADC128_REG_IN_MAX(nr) (0x2a + (nr) * 2)
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#define ADC128_REG_IN_MIN(nr) (0x2b + (nr) * 2)
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#define ADC128_REG_IN(nr) (0x20 + (nr))
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#define ADC128_REG_TEMP 0x27
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#define ADC128_REG_TEMP_MAX 0x38
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#define ADC128_REG_TEMP_HYST 0x39
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#define ADC128_REG_CONFIG 0x00
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#define ADC128_REG_ALARM 0x01
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#define ADC128_REG_MASK 0x03
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#define ADC128_REG_CONV_RATE 0x07
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#define ADC128_REG_ONESHOT 0x09
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#define ADC128_REG_SHUTDOWN 0x0a
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#define ADC128_REG_CONFIG_ADV 0x0b
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#define ADC128_REG_BUSY_STATUS 0x0c
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#define ADC128_REG_MAN_ID 0x3e
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#define ADC128_REG_DEV_ID 0x3f
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struct adc128_data {
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struct i2c_client *client;
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struct regulator *regulator;
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int vref; /* Reference voltage in mV */
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struct mutex update_lock;
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bool valid; /* true if following fields are valid */
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unsigned long last_updated; /* In jiffies */
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u16 in[3][7]; /* Register value, normalized to 12 bit
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* 0: input voltage
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* 1: min limit
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* 2: max limit
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*/
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s16 temp[3]; /* Register value, normalized to 9 bit
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* 0: sensor 1: limit 2: hyst
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*/
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u8 alarms; /* alarm register value */
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};
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static struct adc128_data *adc128_update_device(struct device *dev)
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{
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struct adc128_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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struct adc128_data *ret = data;
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int i, rv;
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mutex_lock(&data->update_lock);
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if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
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for (i = 0; i < 7; i++) {
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rv = i2c_smbus_read_word_swapped(client,
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ADC128_REG_IN(i));
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if (rv < 0)
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goto abort;
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data->in[0][i] = rv >> 4;
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rv = i2c_smbus_read_byte_data(client,
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ADC128_REG_IN_MIN(i));
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if (rv < 0)
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goto abort;
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data->in[1][i] = rv << 4;
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rv = i2c_smbus_read_byte_data(client,
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ADC128_REG_IN_MAX(i));
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if (rv < 0)
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goto abort;
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data->in[2][i] = rv << 4;
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}
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rv = i2c_smbus_read_word_swapped(client, ADC128_REG_TEMP);
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if (rv < 0)
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goto abort;
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data->temp[0] = rv >> 7;
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rv = i2c_smbus_read_byte_data(client, ADC128_REG_TEMP_MAX);
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if (rv < 0)
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goto abort;
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data->temp[1] = rv << 1;
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rv = i2c_smbus_read_byte_data(client, ADC128_REG_TEMP_HYST);
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if (rv < 0)
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goto abort;
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data->temp[2] = rv << 1;
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rv = i2c_smbus_read_byte_data(client, ADC128_REG_ALARM);
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if (rv < 0)
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goto abort;
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data->alarms |= rv;
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data->last_updated = jiffies;
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data->valid = true;
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}
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goto done;
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abort:
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ret = ERR_PTR(rv);
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data->valid = false;
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done:
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mutex_unlock(&data->update_lock);
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return ret;
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}
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static ssize_t adc128_show_in(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct adc128_data *data = adc128_update_device(dev);
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int index = to_sensor_dev_attr_2(attr)->index;
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int nr = to_sensor_dev_attr_2(attr)->nr;
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int val;
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if (IS_ERR(data))
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return PTR_ERR(data);
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val = DIV_ROUND_CLOSEST(data->in[index][nr] * data->vref, 4095);
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return sprintf(buf, "%d\n", val);
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}
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static ssize_t adc128_set_in(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct adc128_data *data = dev_get_drvdata(dev);
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int index = to_sensor_dev_attr_2(attr)->index;
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int nr = to_sensor_dev_attr_2(attr)->nr;
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u8 reg, regval;
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long val;
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int err;
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err = kstrtol(buf, 10, &val);
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if (err < 0)
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return err;
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mutex_lock(&data->update_lock);
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/* 10 mV LSB on limit registers */
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regval = clamp_val(DIV_ROUND_CLOSEST(val, 10), 0, 255);
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data->in[index][nr] = regval << 4;
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reg = index == 1 ? ADC128_REG_IN_MIN(nr) : ADC128_REG_IN_MAX(nr);
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i2c_smbus_write_byte_data(data->client, reg, regval);
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mutex_unlock(&data->update_lock);
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return count;
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}
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static ssize_t adc128_show_temp(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct adc128_data *data = adc128_update_device(dev);
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int index = to_sensor_dev_attr(attr)->index;
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int temp;
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if (IS_ERR(data))
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return PTR_ERR(data);
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temp = sign_extend32(data->temp[index], 8);
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return sprintf(buf, "%d\n", temp * 500);/* 0.5 degrees C resolution */
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}
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static ssize_t adc128_set_temp(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct adc128_data *data = dev_get_drvdata(dev);
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int index = to_sensor_dev_attr(attr)->index;
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long val;
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int err;
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s8 regval;
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err = kstrtol(buf, 10, &val);
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if (err < 0)
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return err;
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mutex_lock(&data->update_lock);
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regval = clamp_val(DIV_ROUND_CLOSEST(val, 1000), -128, 127);
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data->temp[index] = regval << 1;
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i2c_smbus_write_byte_data(data->client,
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index == 1 ? ADC128_REG_TEMP_MAX
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: ADC128_REG_TEMP_HYST,
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regval);
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mutex_unlock(&data->update_lock);
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return count;
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}
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static ssize_t adc128_show_alarm(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct adc128_data *data = adc128_update_device(dev);
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int mask = 1 << to_sensor_dev_attr(attr)->index;
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u8 alarms;
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if (IS_ERR(data))
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return PTR_ERR(data);
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/*
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* Clear an alarm after reporting it to user space. If it is still
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* active, the next update sequence will set the alarm bit again.
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*/
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alarms = data->alarms;
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data->alarms &= ~mask;
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return sprintf(buf, "%u\n", !!(alarms & mask));
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}
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static SENSOR_DEVICE_ATTR_2(in0_input, S_IRUGO,
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adc128_show_in, NULL, 0, 0);
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static SENSOR_DEVICE_ATTR_2(in0_min, S_IWUSR | S_IRUGO,
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adc128_show_in, adc128_set_in, 0, 1);
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static SENSOR_DEVICE_ATTR_2(in0_max, S_IWUSR | S_IRUGO,
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adc128_show_in, adc128_set_in, 0, 2);
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static SENSOR_DEVICE_ATTR_2(in1_input, S_IRUGO,
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adc128_show_in, NULL, 1, 0);
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static SENSOR_DEVICE_ATTR_2(in1_min, S_IWUSR | S_IRUGO,
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adc128_show_in, adc128_set_in, 1, 1);
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static SENSOR_DEVICE_ATTR_2(in1_max, S_IWUSR | S_IRUGO,
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adc128_show_in, adc128_set_in, 1, 2);
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static SENSOR_DEVICE_ATTR_2(in2_input, S_IRUGO,
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adc128_show_in, NULL, 2, 0);
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static SENSOR_DEVICE_ATTR_2(in2_min, S_IWUSR | S_IRUGO,
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adc128_show_in, adc128_set_in, 2, 1);
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static SENSOR_DEVICE_ATTR_2(in2_max, S_IWUSR | S_IRUGO,
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adc128_show_in, adc128_set_in, 2, 2);
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static SENSOR_DEVICE_ATTR_2(in3_input, S_IRUGO,
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adc128_show_in, NULL, 3, 0);
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static SENSOR_DEVICE_ATTR_2(in3_min, S_IWUSR | S_IRUGO,
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adc128_show_in, adc128_set_in, 3, 1);
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static SENSOR_DEVICE_ATTR_2(in3_max, S_IWUSR | S_IRUGO,
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adc128_show_in, adc128_set_in, 3, 2);
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static SENSOR_DEVICE_ATTR_2(in4_input, S_IRUGO,
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adc128_show_in, NULL, 4, 0);
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static SENSOR_DEVICE_ATTR_2(in4_min, S_IWUSR | S_IRUGO,
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adc128_show_in, adc128_set_in, 4, 1);
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static SENSOR_DEVICE_ATTR_2(in4_max, S_IWUSR | S_IRUGO,
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adc128_show_in, adc128_set_in, 4, 2);
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static SENSOR_DEVICE_ATTR_2(in5_input, S_IRUGO,
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adc128_show_in, NULL, 5, 0);
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static SENSOR_DEVICE_ATTR_2(in5_min, S_IWUSR | S_IRUGO,
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adc128_show_in, adc128_set_in, 5, 1);
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static SENSOR_DEVICE_ATTR_2(in5_max, S_IWUSR | S_IRUGO,
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adc128_show_in, adc128_set_in, 5, 2);
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static SENSOR_DEVICE_ATTR_2(in6_input, S_IRUGO,
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adc128_show_in, NULL, 6, 0);
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static SENSOR_DEVICE_ATTR_2(in6_min, S_IWUSR | S_IRUGO,
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adc128_show_in, adc128_set_in, 6, 1);
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static SENSOR_DEVICE_ATTR_2(in6_max, S_IWUSR | S_IRUGO,
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adc128_show_in, adc128_set_in, 6, 2);
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static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, adc128_show_temp, NULL, 0);
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static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
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adc128_show_temp, adc128_set_temp, 1);
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static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
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adc128_show_temp, adc128_set_temp, 2);
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static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, adc128_show_alarm, NULL, 0);
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static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, adc128_show_alarm, NULL, 1);
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static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, adc128_show_alarm, NULL, 2);
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static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, adc128_show_alarm, NULL, 3);
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static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, adc128_show_alarm, NULL, 4);
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static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, adc128_show_alarm, NULL, 5);
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static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, adc128_show_alarm, NULL, 6);
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static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, adc128_show_alarm, NULL, 7);
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static struct attribute *adc128_attrs[] = {
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&sensor_dev_attr_in0_min.dev_attr.attr,
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&sensor_dev_attr_in1_min.dev_attr.attr,
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&sensor_dev_attr_in2_min.dev_attr.attr,
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&sensor_dev_attr_in3_min.dev_attr.attr,
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&sensor_dev_attr_in4_min.dev_attr.attr,
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&sensor_dev_attr_in5_min.dev_attr.attr,
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&sensor_dev_attr_in6_min.dev_attr.attr,
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&sensor_dev_attr_in0_max.dev_attr.attr,
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&sensor_dev_attr_in1_max.dev_attr.attr,
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&sensor_dev_attr_in2_max.dev_attr.attr,
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&sensor_dev_attr_in3_max.dev_attr.attr,
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&sensor_dev_attr_in4_max.dev_attr.attr,
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&sensor_dev_attr_in5_max.dev_attr.attr,
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&sensor_dev_attr_in6_max.dev_attr.attr,
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&sensor_dev_attr_in0_input.dev_attr.attr,
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&sensor_dev_attr_in1_input.dev_attr.attr,
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&sensor_dev_attr_in2_input.dev_attr.attr,
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&sensor_dev_attr_in3_input.dev_attr.attr,
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&sensor_dev_attr_in4_input.dev_attr.attr,
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&sensor_dev_attr_in5_input.dev_attr.attr,
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&sensor_dev_attr_in6_input.dev_attr.attr,
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_temp1_max.dev_attr.attr,
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&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
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&sensor_dev_attr_in0_alarm.dev_attr.attr,
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&sensor_dev_attr_in1_alarm.dev_attr.attr,
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&sensor_dev_attr_in2_alarm.dev_attr.attr,
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&sensor_dev_attr_in3_alarm.dev_attr.attr,
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&sensor_dev_attr_in4_alarm.dev_attr.attr,
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&sensor_dev_attr_in5_alarm.dev_attr.attr,
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&sensor_dev_attr_in6_alarm.dev_attr.attr,
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&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(adc128);
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static int adc128_detect(struct i2c_client *client, struct i2c_board_info *info)
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{
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int man_id, dev_id;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_BYTE_DATA |
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I2C_FUNC_SMBUS_WORD_DATA))
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return -ENODEV;
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man_id = i2c_smbus_read_byte_data(client, ADC128_REG_MAN_ID);
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dev_id = i2c_smbus_read_byte_data(client, ADC128_REG_DEV_ID);
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if (man_id != 0x01 || dev_id != 0x09)
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return -ENODEV;
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/* Check unused bits for confirmation */
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if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG) & 0xf4)
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return -ENODEV;
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if (i2c_smbus_read_byte_data(client, ADC128_REG_CONV_RATE) & 0xfe)
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return -ENODEV;
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if (i2c_smbus_read_byte_data(client, ADC128_REG_ONESHOT) & 0xfe)
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return -ENODEV;
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if (i2c_smbus_read_byte_data(client, ADC128_REG_SHUTDOWN) & 0xfe)
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return -ENODEV;
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if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV) & 0xf8)
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return -ENODEV;
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if (i2c_smbus_read_byte_data(client, ADC128_REG_BUSY_STATUS) & 0xfc)
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return -ENODEV;
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strlcpy(info->type, "adc128d818", I2C_NAME_SIZE);
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return 0;
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}
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static int adc128_init_client(struct adc128_data *data)
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{
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struct i2c_client *client = data->client;
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int err;
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/*
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* Reset chip to defaults.
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* This makes most other initializations unnecessary.
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*/
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err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x80);
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if (err)
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return err;
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/* Start monitoring */
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err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x01);
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if (err)
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return err;
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/* If external vref is selected, configure the chip to use it */
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if (data->regulator) {
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err = i2c_smbus_write_byte_data(client,
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ADC128_REG_CONFIG_ADV, 0x01);
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if (err)
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return err;
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}
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return 0;
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}
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static int adc128_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct device *dev = &client->dev;
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struct regulator *regulator;
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struct device *hwmon_dev;
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struct adc128_data *data;
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int err, vref;
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data = devm_kzalloc(dev, sizeof(struct adc128_data), GFP_KERNEL);
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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");
|