/*
* ADE7759 Active Energy Metering IC with di/dt Sensor Interface Driver
*
* Copyright 2010 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/spi/spi.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include "meter.h"
#include "ade7759.h"
static int ade7759_spi_write_reg_8(struct device *dev,
u8 reg_address,
u8 val)
{
int ret;
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct ade7759_state *st = iio_priv(indio_dev);
mutex_lock(&st->buf_lock);
st->tx[0] = ADE7759_WRITE_REG(reg_address);
st->tx[1] = val;
ret = spi_write(st->us, st->tx, 2);
mutex_unlock(&st->buf_lock);
return ret;
}
static int ade7759_spi_write_reg_16(struct device *dev,
u8 reg_address,
u16 value)
{
int ret;
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct ade7759_state *st = iio_priv(indio_dev);
mutex_lock(&st->buf_lock);
st->tx[0] = ADE7759_WRITE_REG(reg_address);
st->tx[1] = (value >> 8) & 0xFF;
st->tx[2] = value & 0xFF;
ret = spi_write(st->us, st->tx, 3);
mutex_unlock(&st->buf_lock);
return ret;
}
static int ade7759_spi_read_reg_8(struct device *dev,
u8 reg_address,
u8 *val)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct ade7759_state *st = iio_priv(indio_dev);
int ret;
ret = spi_w8r8(st->us, ADE7759_READ_REG(reg_address));
if (ret < 0) {
dev_err(&st->us->dev, "problem when reading 8 bit register 0x%02X",
reg_address);
return ret;
}
*val = ret;
return 0;
}
static int ade7759_spi_read_reg_16(struct device *dev,
u8 reg_address,
u16 *val)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct ade7759_state *st = iio_priv(indio_dev);
int ret;
ret = spi_w8r16be(st->us, ADE7759_READ_REG(reg_address));
if (ret < 0) {
dev_err(&st->us->dev, "problem when reading 16 bit register 0x%02X",
reg_address);
return ret;
}
*val = ret;
return 0;
}
static int ade7759_spi_read_reg_40(struct device *dev,
u8 reg_address,
u64 *val)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct ade7759_state *st = iio_priv(indio_dev);
int ret;
struct spi_transfer xfers[] = {
{
.tx_buf = st->tx,
.rx_buf = st->rx,
.bits_per_word = 8,
.len = 6,
},
};
mutex_lock(&st->buf_lock);
st->tx[0] = ADE7759_READ_REG(reg_address);
memset(&st->tx[1], 0, 5);
ret = spi_sync_transfer(st->us, xfers, ARRAY_SIZE(xfers));
if (ret) {
dev_err(&st->us->dev, "problem when reading 40 bit register 0x%02X",
reg_address);
goto error_ret;
}
*val = ((u64)st->rx[1] << 32) | (st->rx[2] << 24) |
(st->rx[3] << 16) | (st->rx[4] << 8) | st->rx[5];
error_ret:
mutex_unlock(&st->buf_lock);
return ret;
}
static ssize_t ade7759_read_8bit(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int ret;
u8 val = 0;
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
ret = ade7759_spi_read_reg_8(dev, this_attr->address, &val);
if (ret)
return ret;
return sprintf(buf, "%u\n", val);
}
static ssize_t ade7759_read_16bit(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int ret;
u16 val = 0;
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
ret = ade7759_spi_read_reg_16(dev, this_attr->address, &val);
if (ret)
return ret;
return sprintf(buf, "%u\n", val);
}
static ssize_t ade7759_read_40bit(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int ret;
u64 val = 0;
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
ret = ade7759_spi_read_reg_40(dev, this_attr->address, &val);
if (ret)
return ret;
return sprintf(buf, "%llu\n", val);
}
static ssize_t ade7759_write_8bit(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
int ret;
u8 val;
ret = kstrtou8(buf, 10, &val);
if (ret)
goto error_ret;
ret = ade7759_spi_write_reg_8(dev, this_attr->address, val);
error_ret:
return ret ? ret : len;
}
static ssize_t ade7759_write_16bit(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
int ret;
u16 val;
ret = kstrtou16(buf, 10, &val);
if (ret)
goto error_ret;
ret = ade7759_spi_write_reg_16(dev, this_attr->address, val);
error_ret:
return ret ? ret : len;
}
static int ade7759_reset(struct device *dev)
{
int ret;
u16 val;
ret = ade7759_spi_read_reg_16(dev,
ADE7759_MODE,
&val);
if (ret < 0)
return ret;
val |= BIT(6); /* Software Chip Reset */
return ade7759_spi_write_reg_16(dev,
ADE7759_MODE,
val);
}
static IIO_DEV_ATTR_AENERGY(ade7759_read_40bit, ADE7759_AENERGY);
static IIO_DEV_ATTR_CFDEN(S_IWUSR | S_IRUGO,
ade7759_read_16bit,
ade7759_write_16bit,
ADE7759_CFDEN);
static IIO_DEV_ATTR_CFNUM(S_IWUSR | S_IRUGO,
ade7759_read_8bit,
ade7759_write_8bit,
ADE7759_CFNUM);
static IIO_DEV_ATTR_CHKSUM(ade7759_read_8bit, ADE7759_CHKSUM);
static IIO_DEV_ATTR_PHCAL(S_IWUSR | S_IRUGO,
ade7759_read_16bit,
ade7759_write_16bit,
ADE7759_PHCAL);
static IIO_DEV_ATTR_APOS(S_IWUSR | S_IRUGO,
ade7759_read_16bit,
ade7759_write_16bit,
ADE7759_APOS);
static IIO_DEV_ATTR_SAGCYC(S_IWUSR | S_IRUGO,
ade7759_read_8bit,
ade7759_write_8bit,
ADE7759_SAGCYC);
static IIO_DEV_ATTR_SAGLVL(S_IWUSR | S_IRUGO,
ade7759_read_8bit,
ade7759_write_8bit,
ADE7759_SAGLVL);
static IIO_DEV_ATTR_LINECYC(S_IWUSR | S_IRUGO,
ade7759_read_8bit,
ade7759_write_8bit,
ADE7759_LINECYC);
static IIO_DEV_ATTR_LENERGY(ade7759_read_40bit, ADE7759_LENERGY);
static IIO_DEV_ATTR_PGA_GAIN(S_IWUSR | S_IRUGO,
ade7759_read_8bit,
ade7759_write_8bit,
ADE7759_GAIN);
static IIO_DEV_ATTR_ACTIVE_POWER_GAIN(S_IWUSR | S_IRUGO,
ade7759_read_16bit,
ade7759_write_16bit,
ADE7759_APGAIN);
static IIO_DEV_ATTR_CH_OFF(1, S_IWUSR | S_IRUGO,
ade7759_read_8bit,
ade7759_write_8bit,
ADE7759_CH1OS);
static IIO_DEV_ATTR_CH_OFF(2, S_IWUSR | S_IRUGO,
ade7759_read_8bit,
ade7759_write_8bit,
ADE7759_CH2OS);
static int ade7759_set_irq(struct device *dev, bool enable)
{
int ret;
u8 irqen;
ret = ade7759_spi_read_reg_8(dev, ADE7759_IRQEN, &irqen);
if (ret)
goto error_ret;
if (enable)
irqen |= BIT(3); /* Enables an interrupt when a data is
present in the waveform register */
else
irqen &= ~BIT(3);
ret = ade7759_spi_write_reg_8(dev, ADE7759_IRQEN, irqen);
error_ret:
return ret;
}
/* Power down the device */
static int ade7759_stop_device(struct device *dev)
{
int ret;
u16 val;
ret = ade7759_spi_read_reg_16(dev,
ADE7759_MODE,
&val);
if (ret < 0) {
dev_err(dev, "unable to power down the device, error: %d\n",
ret);
return ret;
}
val |= BIT(4); /* AD converters can be turned off */
return ade7759_spi_write_reg_16(dev, ADE7759_MODE, val);
}
static int ade7759_initial_setup(struct iio_dev *indio_dev)
{
int ret;
struct ade7759_state *st = iio_priv(indio_dev);
struct device *dev = &indio_dev->dev;
/* use low spi speed for init */
st->us->mode = SPI_MODE_3;
spi_setup(st->us);
/* Disable IRQ */
ret = ade7759_set_irq(dev, false);
if (ret) {
dev_err(dev, "disable irq failed");
goto err_ret;
}
ade7759_reset(dev);
msleep(ADE7759_STARTUP_DELAY);
err_ret:
return ret;
}
static ssize_t ade7759_read_frequency(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int ret;
u16 t;
int sps;
ret = ade7759_spi_read_reg_16(dev,
ADE7759_MODE,
&t);
if (ret)
return ret;
t = (t >> 3) & 0x3;
sps = 27900 / (1 + t);
return sprintf(buf, "%d\n", sps);
}
static ssize_t ade7759_write_frequency(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct ade7759_state *st = iio_priv(indio_dev);
u16 val;
int ret;
u16 reg, t;
ret = kstrtou16(buf, 10, &val);
if (ret)
return ret;
if (!val)
return -EINVAL;
mutex_lock(&indio_dev->mlock);
t = 27900 / val;
if (t > 0)
t--;
if (t > 1)
st->us->max_speed_hz = ADE7759_SPI_SLOW;
else
st->us->max_speed_hz = ADE7759_SPI_FAST;
ret = ade7759_spi_read_reg_16(dev, ADE7759_MODE, ®);
if (ret)
goto out;
reg &= ~(3 << 13);
reg |= t << 13;
ret = ade7759_spi_write_reg_16(dev, ADE7759_MODE, reg);
out:
mutex_unlock(&indio_dev->mlock);
return ret ? ret : len;
}
static IIO_DEV_ATTR_TEMP_RAW(ade7759_read_8bit);
static IIO_CONST_ATTR(in_temp_offset, "70 C");
static IIO_CONST_ATTR(in_temp_scale, "1 C");
static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
ade7759_read_frequency,
ade7759_write_frequency);
static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("27900 14000 7000 3500");
static struct attribute *ade7759_attributes[] = {
&iio_dev_attr_in_temp_raw.dev_attr.attr,
&iio_const_attr_in_temp_offset.dev_attr.attr,
&iio_const_attr_in_temp_scale.dev_attr.attr,
&iio_dev_attr_sampling_frequency.dev_attr.attr,
&iio_const_attr_sampling_frequency_available.dev_attr.attr,
&iio_dev_attr_phcal.dev_attr.attr,
&iio_dev_attr_cfden.dev_attr.attr,
&iio_dev_attr_aenergy.dev_attr.attr,
&iio_dev_attr_cfnum.dev_attr.attr,
&iio_dev_attr_apos.dev_attr.attr,
&iio_dev_attr_sagcyc.dev_attr.attr,
&iio_dev_attr_saglvl.dev_attr.attr,
&iio_dev_attr_linecyc.dev_attr.attr,
&iio_dev_attr_lenergy.dev_attr.attr,
&iio_dev_attr_chksum.dev_attr.attr,
&iio_dev_attr_pga_gain.dev_attr.attr,
&iio_dev_attr_active_power_gain.dev_attr.attr,
&iio_dev_attr_choff_1.dev_attr.attr,
&iio_dev_attr_choff_2.dev_attr.attr,
NULL,
};
static const struct attribute_group ade7759_attribute_group = {
.attrs = ade7759_attributes,
};
static const struct iio_info ade7759_info = {
.attrs = &ade7759_attribute_group,
.driver_module = THIS_MODULE,
};
static int ade7759_probe(struct spi_device *spi)
{
int ret;
struct ade7759_state *st;
struct iio_dev *indio_dev;
/* setup the industrialio driver allocated elements */
indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
if (!indio_dev)
return -ENOMEM;
/* this is only used for removal purposes */
spi_set_drvdata(spi, indio_dev);
st = iio_priv(indio_dev);
st->us = spi;
mutex_init(&st->buf_lock);
indio_dev->name = spi->dev.driver->name;
indio_dev->dev.parent = &spi->dev;
indio_dev->info = &ade7759_info;
indio_dev->modes = INDIO_DIRECT_MODE;
/* Get the device into a sane initial state */
ret = ade7759_initial_setup(indio_dev);
if (ret)
return ret;
return iio_device_register(indio_dev);
}
/* fixme, confirm ordering in this function */
static int ade7759_remove(struct spi_device *spi)
{
struct iio_dev *indio_dev = spi_get_drvdata(spi);
iio_device_unregister(indio_dev);
ade7759_stop_device(&indio_dev->dev);
return 0;
}
static struct spi_driver ade7759_driver = {
.driver = {
.name = "ade7759",
},
.probe = ade7759_probe,
.remove = ade7759_remove,
};
module_spi_driver(ade7759_driver);
MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
MODULE_DESCRIPTION("Analog Devices ADE7759 Active Energy Metering IC Driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("spi:ad7759");