379 lines
10 KiB
C
379 lines
10 KiB
C
/*
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* Driver for the ADT7411 (I2C/SPI 8 channel 10 bit ADC & temperature-sensor)
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*
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* Copyright (C) 2008, 2010 Pengutronix
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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 version 2 as
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* published by the Free Software Foundation.
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*
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* TODO: SPI, support for external temperature sensor
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* use power-down mode for suspend?, interrupt handling?
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/mutex.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/slab.h>
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#define ADT7411_REG_INT_TEMP_VDD_LSB 0x03
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#define ADT7411_REG_EXT_TEMP_AIN14_LSB 0x04
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#define ADT7411_REG_VDD_MSB 0x06
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#define ADT7411_REG_INT_TEMP_MSB 0x07
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#define ADT7411_REG_EXT_TEMP_AIN1_MSB 0x08
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#define ADT7411_REG_CFG1 0x18
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#define ADT7411_CFG1_START_MONITOR (1 << 0)
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#define ADT7411_CFG1_RESERVED_BIT1 (1 << 1)
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#define ADT7411_CFG1_RESERVED_BIT3 (1 << 3)
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#define ADT7411_REG_CFG2 0x19
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#define ADT7411_CFG2_DISABLE_AVG (1 << 5)
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#define ADT7411_REG_CFG3 0x1a
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#define ADT7411_CFG3_ADC_CLK_225 (1 << 0)
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#define ADT7411_CFG3_RESERVED_BIT1 (1 << 1)
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#define ADT7411_CFG3_RESERVED_BIT2 (1 << 2)
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#define ADT7411_CFG3_RESERVED_BIT3 (1 << 3)
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#define ADT7411_CFG3_REF_VDD (1 << 4)
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#define ADT7411_REG_DEVICE_ID 0x4d
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#define ADT7411_REG_MANUFACTURER_ID 0x4e
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#define ADT7411_DEVICE_ID 0x2
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#define ADT7411_MANUFACTURER_ID 0x41
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static const unsigned short normal_i2c[] = { 0x48, 0x4a, 0x4b, I2C_CLIENT_END };
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struct adt7411_data {
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struct mutex device_lock; /* for "atomic" device accesses */
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struct mutex update_lock;
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unsigned long next_update;
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int vref_cached;
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struct i2c_client *client;
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};
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/*
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* When reading a register containing (up to 4) lsb, all associated
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* msb-registers get locked by the hardware. After _one_ of those msb is read,
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* _all_ are unlocked. In order to use this locking correctly, reading lsb/msb
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* is protected here with a mutex, too.
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*/
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static int adt7411_read_10_bit(struct i2c_client *client, u8 lsb_reg,
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u8 msb_reg, u8 lsb_shift)
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{
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struct adt7411_data *data = i2c_get_clientdata(client);
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int val, tmp;
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mutex_lock(&data->device_lock);
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val = i2c_smbus_read_byte_data(client, lsb_reg);
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if (val < 0)
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goto exit_unlock;
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tmp = (val >> lsb_shift) & 3;
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val = i2c_smbus_read_byte_data(client, msb_reg);
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if (val >= 0)
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val = (val << 2) | tmp;
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exit_unlock:
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mutex_unlock(&data->device_lock);
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return val;
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}
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static int adt7411_modify_bit(struct i2c_client *client, u8 reg, u8 bit,
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bool flag)
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{
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struct adt7411_data *data = i2c_get_clientdata(client);
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int ret, val;
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mutex_lock(&data->device_lock);
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ret = i2c_smbus_read_byte_data(client, reg);
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if (ret < 0)
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goto exit_unlock;
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if (flag)
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val = ret | bit;
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else
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val = ret & ~bit;
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ret = i2c_smbus_write_byte_data(client, reg, val);
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exit_unlock:
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mutex_unlock(&data->device_lock);
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return ret;
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}
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static ssize_t adt7411_show_vdd(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct adt7411_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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int ret = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB,
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ADT7411_REG_VDD_MSB, 2);
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return ret < 0 ? ret : sprintf(buf, "%u\n", ret * 7000 / 1024);
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}
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static ssize_t adt7411_show_temp(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct adt7411_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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int val = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB,
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ADT7411_REG_INT_TEMP_MSB, 0);
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if (val < 0)
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return val;
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val = val & 0x200 ? val - 0x400 : val; /* 10 bit signed */
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return sprintf(buf, "%d\n", val * 250);
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}
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static ssize_t adt7411_show_input(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int nr = to_sensor_dev_attr(attr)->index;
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struct adt7411_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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int val;
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u8 lsb_reg, lsb_shift;
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mutex_lock(&data->update_lock);
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if (time_after_eq(jiffies, data->next_update)) {
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val = i2c_smbus_read_byte_data(client, ADT7411_REG_CFG3);
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if (val < 0)
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goto exit_unlock;
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if (val & ADT7411_CFG3_REF_VDD) {
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val = adt7411_read_10_bit(client,
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ADT7411_REG_INT_TEMP_VDD_LSB,
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ADT7411_REG_VDD_MSB, 2);
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if (val < 0)
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goto exit_unlock;
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data->vref_cached = val * 7000 / 1024;
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} else {
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data->vref_cached = 2250;
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}
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data->next_update = jiffies + HZ;
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}
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lsb_reg = ADT7411_REG_EXT_TEMP_AIN14_LSB + (nr >> 2);
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lsb_shift = 2 * (nr & 0x03);
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val = adt7411_read_10_bit(client, lsb_reg,
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ADT7411_REG_EXT_TEMP_AIN1_MSB + nr, lsb_shift);
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if (val < 0)
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goto exit_unlock;
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val = sprintf(buf, "%u\n", val * data->vref_cached / 1024);
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exit_unlock:
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mutex_unlock(&data->update_lock);
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return val;
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}
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static ssize_t adt7411_show_bit(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
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struct adt7411_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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int ret = i2c_smbus_read_byte_data(client, attr2->index);
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return ret < 0 ? ret : sprintf(buf, "%u\n", !!(ret & attr2->nr));
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}
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static ssize_t adt7411_set_bit(struct device *dev,
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struct device_attribute *attr, const char *buf,
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size_t count)
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{
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struct sensor_device_attribute_2 *s_attr2 = to_sensor_dev_attr_2(attr);
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struct adt7411_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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int ret;
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unsigned long flag;
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ret = kstrtoul(buf, 0, &flag);
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if (ret || flag > 1)
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return -EINVAL;
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ret = adt7411_modify_bit(client, s_attr2->index, s_attr2->nr, flag);
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/* force update */
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mutex_lock(&data->update_lock);
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data->next_update = jiffies;
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mutex_unlock(&data->update_lock);
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return ret < 0 ? ret : count;
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}
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#define ADT7411_BIT_ATTR(__name, __reg, __bit) \
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SENSOR_DEVICE_ATTR_2(__name, S_IRUGO | S_IWUSR, adt7411_show_bit, \
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adt7411_set_bit, __bit, __reg)
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static DEVICE_ATTR(temp1_input, S_IRUGO, adt7411_show_temp, NULL);
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static DEVICE_ATTR(in0_input, S_IRUGO, adt7411_show_vdd, NULL);
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static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, adt7411_show_input, NULL, 0);
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static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, adt7411_show_input, NULL, 1);
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static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, adt7411_show_input, NULL, 2);
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static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, adt7411_show_input, NULL, 3);
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static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, adt7411_show_input, NULL, 4);
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static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, adt7411_show_input, NULL, 5);
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static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, adt7411_show_input, NULL, 6);
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static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, adt7411_show_input, NULL, 7);
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static ADT7411_BIT_ATTR(no_average, ADT7411_REG_CFG2, ADT7411_CFG2_DISABLE_AVG);
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static ADT7411_BIT_ATTR(fast_sampling, ADT7411_REG_CFG3, ADT7411_CFG3_ADC_CLK_225);
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static ADT7411_BIT_ATTR(adc_ref_vdd, ADT7411_REG_CFG3, ADT7411_CFG3_REF_VDD);
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static struct attribute *adt7411_attrs[] = {
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&dev_attr_temp1_input.attr,
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&dev_attr_in0_input.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_in7_input.dev_attr.attr,
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&sensor_dev_attr_in8_input.dev_attr.attr,
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&sensor_dev_attr_no_average.dev_attr.attr,
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&sensor_dev_attr_fast_sampling.dev_attr.attr,
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&sensor_dev_attr_adc_ref_vdd.dev_attr.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(adt7411);
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static int adt7411_detect(struct i2c_client *client,
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struct i2c_board_info *info)
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{
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int val;
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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return -ENODEV;
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val = i2c_smbus_read_byte_data(client, ADT7411_REG_MANUFACTURER_ID);
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if (val < 0 || val != ADT7411_MANUFACTURER_ID) {
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dev_dbg(&client->dev,
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"Wrong manufacturer ID. Got %d, expected %d\n",
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val, ADT7411_MANUFACTURER_ID);
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return -ENODEV;
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}
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val = i2c_smbus_read_byte_data(client, ADT7411_REG_DEVICE_ID);
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if (val < 0 || val != ADT7411_DEVICE_ID) {
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dev_dbg(&client->dev,
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"Wrong device ID. Got %d, expected %d\n",
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val, ADT7411_DEVICE_ID);
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return -ENODEV;
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}
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strlcpy(info->type, "adt7411", I2C_NAME_SIZE);
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return 0;
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}
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static int adt7411_init_device(struct adt7411_data *data)
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{
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int ret;
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u8 val;
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ret = i2c_smbus_read_byte_data(data->client, ADT7411_REG_CFG3);
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if (ret < 0)
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return ret;
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/*
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* We must only write zero to bit 1 and bit 2 and only one to bit 3
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* according to the datasheet.
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*/
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val = ret;
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val &= ~(ADT7411_CFG3_RESERVED_BIT1 | ADT7411_CFG3_RESERVED_BIT2);
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val |= ADT7411_CFG3_RESERVED_BIT3;
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ret = i2c_smbus_write_byte_data(data->client, ADT7411_REG_CFG3, val);
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if (ret < 0)
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return ret;
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ret = i2c_smbus_read_byte_data(data->client, ADT7411_REG_CFG1);
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if (ret < 0)
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return ret;
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/*
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* We must only write zero to bit 1 and only one to bit 3 according to
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* the datasheet.
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*/
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val = ret;
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val &= ~ADT7411_CFG1_RESERVED_BIT1;
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val |= ADT7411_CFG1_RESERVED_BIT3;
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/* enable monitoring */
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val |= ADT7411_CFG1_START_MONITOR;
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return i2c_smbus_write_byte_data(data->client, ADT7411_REG_CFG1, val);
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}
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static int adt7411_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 adt7411_data *data;
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struct device *hwmon_dev;
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int ret;
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data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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i2c_set_clientdata(client, data);
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data->client = client;
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mutex_init(&data->device_lock);
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mutex_init(&data->update_lock);
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ret = adt7411_init_device(data);
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if (ret < 0)
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return ret;
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/* force update on first occasion */
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data->next_update = jiffies;
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hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
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data,
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adt7411_groups);
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return PTR_ERR_OR_ZERO(hwmon_dev);
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}
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static const struct i2c_device_id adt7411_id[] = {
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{ "adt7411", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, adt7411_id);
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static struct i2c_driver adt7411_driver = {
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.driver = {
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.name = "adt7411",
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},
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.probe = adt7411_probe,
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.id_table = adt7411_id,
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.detect = adt7411_detect,
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.address_list = normal_i2c,
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.class = I2C_CLASS_HWMON,
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};
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module_i2c_driver(adt7411_driver);
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MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de> and "
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"Wolfram Sang <w.sang@pengutronix.de>");
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MODULE_DESCRIPTION("ADT7411 driver");
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MODULE_LICENSE("GPL v2");
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