530 lines
12 KiB
C
530 lines
12 KiB
C
/*
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* ADE7759 Active Energy Metering IC with di/dt Sensor Interface Driver
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*
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* Copyright 2010 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/delay.h>
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#include <linux/mutex.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/spi/spi.h>
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#include <linux/slab.h>
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#include <linux/sysfs.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include "../iio.h"
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#include "../sysfs.h"
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#include "meter.h"
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#include "ade7759.h"
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static int ade7759_spi_write_reg_8(struct device *dev,
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u8 reg_address,
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u8 val)
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{
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int ret;
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct ade7759_state *st = iio_priv(indio_dev);
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mutex_lock(&st->buf_lock);
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st->tx[0] = ADE7759_WRITE_REG(reg_address);
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st->tx[1] = val;
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ret = spi_write(st->us, st->tx, 2);
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mutex_unlock(&st->buf_lock);
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return ret;
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}
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static int ade7759_spi_write_reg_16(struct device *dev,
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u8 reg_address,
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u16 value)
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{
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int ret;
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct ade7759_state *st = iio_priv(indio_dev);
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mutex_lock(&st->buf_lock);
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st->tx[0] = ADE7759_WRITE_REG(reg_address);
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st->tx[1] = (value >> 8) & 0xFF;
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st->tx[2] = value & 0xFF;
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ret = spi_write(st->us, st->tx, 3);
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mutex_unlock(&st->buf_lock);
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return ret;
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}
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static int ade7759_spi_read_reg_8(struct device *dev,
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u8 reg_address,
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u8 *val)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct ade7759_state *st = iio_priv(indio_dev);
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int ret;
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ret = spi_w8r8(st->us, ADE7759_READ_REG(reg_address));
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if (ret < 0) {
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dev_err(&st->us->dev, "problem when reading 8 bit register 0x%02X",
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reg_address);
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return ret;
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}
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*val = ret;
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return 0;
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}
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static int ade7759_spi_read_reg_16(struct device *dev,
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u8 reg_address,
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u16 *val)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct ade7759_state *st = iio_priv(indio_dev);
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int ret;
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ret = spi_w8r16(st->us, ADE7759_READ_REG(reg_address));
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if (ret < 0) {
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dev_err(&st->us->dev, "problem when reading 16 bit register 0x%02X",
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reg_address);
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return ret;
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}
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*val = ret;
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*val = be16_to_cpup(val);
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return 0;
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}
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static int ade7759_spi_read_reg_40(struct device *dev,
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u8 reg_address,
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u64 *val)
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{
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struct spi_message msg;
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct ade7759_state *st = iio_priv(indio_dev);
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int ret;
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struct spi_transfer xfers[] = {
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{
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.tx_buf = st->tx,
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.rx_buf = st->rx,
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.bits_per_word = 8,
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.len = 6,
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},
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};
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mutex_lock(&st->buf_lock);
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st->tx[0] = ADE7759_READ_REG(reg_address);
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memset(&st->tx[1], 0 , 5);
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spi_message_init(&msg);
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spi_message_add_tail(xfers, &msg);
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ret = spi_sync(st->us, &msg);
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if (ret) {
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dev_err(&st->us->dev, "problem when reading 40 bit register 0x%02X",
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reg_address);
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goto error_ret;
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}
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*val = ((u64)st->rx[1] << 32) | (st->rx[2] << 24) |
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(st->rx[3] << 16) | (st->rx[4] << 8) | st->rx[5];
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error_ret:
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mutex_unlock(&st->buf_lock);
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return ret;
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}
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static ssize_t ade7759_read_8bit(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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int ret;
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u8 val = 0;
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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ret = ade7759_spi_read_reg_8(dev, this_attr->address, &val);
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if (ret)
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return ret;
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return sprintf(buf, "%u\n", val);
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}
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static ssize_t ade7759_read_16bit(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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int ret;
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u16 val = 0;
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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ret = ade7759_spi_read_reg_16(dev, this_attr->address, &val);
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if (ret)
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return ret;
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return sprintf(buf, "%u\n", val);
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}
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static ssize_t ade7759_read_40bit(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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int ret;
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u64 val = 0;
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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ret = ade7759_spi_read_reg_40(dev, this_attr->address, &val);
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if (ret)
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return ret;
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return sprintf(buf, "%llu\n", val);
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}
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static ssize_t ade7759_write_8bit(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t len)
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{
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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int ret;
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long val;
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ret = strict_strtol(buf, 10, &val);
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if (ret)
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goto error_ret;
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ret = ade7759_spi_write_reg_8(dev, this_attr->address, val);
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error_ret:
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return ret ? ret : len;
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}
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static ssize_t ade7759_write_16bit(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t len)
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{
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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int ret;
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long val;
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ret = strict_strtol(buf, 10, &val);
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if (ret)
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goto error_ret;
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ret = ade7759_spi_write_reg_16(dev, this_attr->address, val);
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error_ret:
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return ret ? ret : len;
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}
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static int ade7759_reset(struct device *dev)
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{
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int ret;
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u16 val;
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ade7759_spi_read_reg_16(dev,
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ADE7759_MODE,
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&val);
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val |= 1 << 6; /* Software Chip Reset */
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ret = ade7759_spi_write_reg_16(dev,
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ADE7759_MODE,
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val);
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return ret;
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}
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static ssize_t ade7759_write_reset(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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{
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if (len < 1)
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return -1;
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switch (buf[0]) {
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case '1':
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case 'y':
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case 'Y':
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return ade7759_reset(dev);
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}
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return -1;
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}
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static IIO_DEV_ATTR_AENERGY(ade7759_read_40bit, ADE7759_AENERGY);
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static IIO_DEV_ATTR_CFDEN(S_IWUSR | S_IRUGO,
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ade7759_read_16bit,
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ade7759_write_16bit,
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ADE7759_CFDEN);
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static IIO_DEV_ATTR_CFNUM(S_IWUSR | S_IRUGO,
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ade7759_read_8bit,
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ade7759_write_8bit,
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ADE7759_CFNUM);
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static IIO_DEV_ATTR_CHKSUM(ade7759_read_8bit, ADE7759_CHKSUM);
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static IIO_DEV_ATTR_PHCAL(S_IWUSR | S_IRUGO,
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ade7759_read_16bit,
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ade7759_write_16bit,
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ADE7759_PHCAL);
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static IIO_DEV_ATTR_APOS(S_IWUSR | S_IRUGO,
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ade7759_read_16bit,
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ade7759_write_16bit,
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ADE7759_APOS);
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static IIO_DEV_ATTR_SAGCYC(S_IWUSR | S_IRUGO,
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ade7759_read_8bit,
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ade7759_write_8bit,
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ADE7759_SAGCYC);
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static IIO_DEV_ATTR_SAGLVL(S_IWUSR | S_IRUGO,
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ade7759_read_8bit,
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ade7759_write_8bit,
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ADE7759_SAGLVL);
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static IIO_DEV_ATTR_LINECYC(S_IWUSR | S_IRUGO,
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ade7759_read_8bit,
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ade7759_write_8bit,
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ADE7759_LINECYC);
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static IIO_DEV_ATTR_LENERGY(ade7759_read_40bit, ADE7759_LENERGY);
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static IIO_DEV_ATTR_PGA_GAIN(S_IWUSR | S_IRUGO,
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ade7759_read_8bit,
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ade7759_write_8bit,
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ADE7759_GAIN);
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static IIO_DEV_ATTR_ACTIVE_POWER_GAIN(S_IWUSR | S_IRUGO,
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ade7759_read_16bit,
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ade7759_write_16bit,
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ADE7759_APGAIN);
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static IIO_DEV_ATTR_CH_OFF(1, S_IWUSR | S_IRUGO,
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ade7759_read_8bit,
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ade7759_write_8bit,
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ADE7759_CH1OS);
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static IIO_DEV_ATTR_CH_OFF(2, S_IWUSR | S_IRUGO,
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ade7759_read_8bit,
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ade7759_write_8bit,
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ADE7759_CH2OS);
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static int ade7759_set_irq(struct device *dev, bool enable)
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{
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int ret;
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u8 irqen;
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ret = ade7759_spi_read_reg_8(dev, ADE7759_IRQEN, &irqen);
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if (ret)
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goto error_ret;
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if (enable)
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irqen |= 1 << 3; /* Enables an interrupt when a data is
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present in the waveform register */
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else
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irqen &= ~(1 << 3);
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ret = ade7759_spi_write_reg_8(dev, ADE7759_IRQEN, irqen);
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error_ret:
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return ret;
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}
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/* Power down the device */
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static int ade7759_stop_device(struct device *dev)
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{
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u16 val;
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ade7759_spi_read_reg_16(dev,
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ADE7759_MODE,
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&val);
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val |= 1 << 4; /* AD converters can be turned off */
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return ade7759_spi_write_reg_16(dev, ADE7759_MODE, val);
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}
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static int ade7759_initial_setup(struct iio_dev *indio_dev)
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{
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int ret;
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struct ade7759_state *st = iio_priv(indio_dev);
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struct device *dev = &indio_dev->dev;
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/* use low spi speed for init */
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st->us->mode = SPI_MODE_3;
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spi_setup(st->us);
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/* Disable IRQ */
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ret = ade7759_set_irq(dev, false);
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if (ret) {
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dev_err(dev, "disable irq failed");
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goto err_ret;
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}
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ade7759_reset(dev);
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msleep(ADE7759_STARTUP_DELAY);
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err_ret:
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return ret;
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}
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static ssize_t ade7759_read_frequency(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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int ret;
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u16 t;
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int sps;
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ret = ade7759_spi_read_reg_16(dev,
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ADE7759_MODE,
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&t);
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if (ret)
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return ret;
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t = (t >> 3) & 0x3;
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sps = 27900 / (1 + t);
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return sprintf(buf, "%d\n", sps);
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}
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static ssize_t ade7759_write_frequency(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t len)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct ade7759_state *st = iio_priv(indio_dev);
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unsigned long val;
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int ret;
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u16 reg, t;
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ret = strict_strtol(buf, 10, &val);
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if (ret)
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return ret;
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mutex_lock(&indio_dev->mlock);
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t = (27900 / val);
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if (t > 0)
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t--;
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if (t > 1)
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st->us->max_speed_hz = ADE7759_SPI_SLOW;
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else
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st->us->max_speed_hz = ADE7759_SPI_FAST;
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ret = ade7759_spi_read_reg_16(dev, ADE7759_MODE, ®);
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if (ret)
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goto out;
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reg &= ~(3 << 13);
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reg |= t << 13;
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ret = ade7759_spi_write_reg_16(dev, ADE7759_MODE, reg);
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out:
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mutex_unlock(&indio_dev->mlock);
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return ret ? ret : len;
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}
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static IIO_DEV_ATTR_TEMP_RAW(ade7759_read_8bit);
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static IIO_CONST_ATTR(in_temp_offset, "70 C");
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static IIO_CONST_ATTR(in_temp_scale, "1 C");
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static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
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ade7759_read_frequency,
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ade7759_write_frequency);
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static IIO_DEV_ATTR_RESET(ade7759_write_reset);
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static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("27900 14000 7000 3500");
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static struct attribute *ade7759_attributes[] = {
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&iio_dev_attr_in_temp_raw.dev_attr.attr,
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&iio_const_attr_in_temp_offset.dev_attr.attr,
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&iio_const_attr_in_temp_scale.dev_attr.attr,
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&iio_dev_attr_sampling_frequency.dev_attr.attr,
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&iio_const_attr_sampling_frequency_available.dev_attr.attr,
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&iio_dev_attr_reset.dev_attr.attr,
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&iio_dev_attr_phcal.dev_attr.attr,
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&iio_dev_attr_cfden.dev_attr.attr,
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&iio_dev_attr_aenergy.dev_attr.attr,
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&iio_dev_attr_cfnum.dev_attr.attr,
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&iio_dev_attr_apos.dev_attr.attr,
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&iio_dev_attr_sagcyc.dev_attr.attr,
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&iio_dev_attr_saglvl.dev_attr.attr,
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&iio_dev_attr_linecyc.dev_attr.attr,
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&iio_dev_attr_lenergy.dev_attr.attr,
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&iio_dev_attr_chksum.dev_attr.attr,
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&iio_dev_attr_pga_gain.dev_attr.attr,
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&iio_dev_attr_active_power_gain.dev_attr.attr,
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&iio_dev_attr_choff_1.dev_attr.attr,
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&iio_dev_attr_choff_2.dev_attr.attr,
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NULL,
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};
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static const struct attribute_group ade7759_attribute_group = {
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.attrs = ade7759_attributes,
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};
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static const struct iio_info ade7759_info = {
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.attrs = &ade7759_attribute_group,
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.driver_module = THIS_MODULE,
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};
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static int __devinit ade7759_probe(struct spi_device *spi)
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{
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int ret;
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struct ade7759_state *st;
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struct iio_dev *indio_dev;
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/* setup the industrialio driver allocated elements */
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indio_dev = iio_allocate_device(sizeof(*st));
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if (indio_dev == NULL) {
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ret = -ENOMEM;
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goto error_ret;
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}
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/* this is only used for removal purposes */
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spi_set_drvdata(spi, indio_dev);
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st = iio_priv(indio_dev);
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st->us = spi;
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mutex_init(&st->buf_lock);
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indio_dev->name = spi->dev.driver->name;
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indio_dev->dev.parent = &spi->dev;
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indio_dev->info = &ade7759_info;
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indio_dev->modes = INDIO_DIRECT_MODE;
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/* Get the device into a sane initial state */
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ret = ade7759_initial_setup(indio_dev);
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if (ret)
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goto error_free_dev;
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ret = iio_device_register(indio_dev);
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if (ret)
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goto error_free_dev;
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return 0;
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error_free_dev:
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iio_free_device(indio_dev);
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error_ret:
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return ret;
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}
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/* fixme, confirm ordering in this function */
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static int ade7759_remove(struct spi_device *spi)
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{
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int ret;
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struct iio_dev *indio_dev = spi_get_drvdata(spi);
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iio_device_unregister(indio_dev);
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ret = ade7759_stop_device(&(indio_dev->dev));
|
|
if (ret)
|
|
goto err_ret;
|
|
|
|
iio_free_device(indio_dev);
|
|
|
|
err_ret:
|
|
return ret;
|
|
}
|
|
|
|
static struct spi_driver ade7759_driver = {
|
|
.driver = {
|
|
.name = "ade7759",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = ade7759_probe,
|
|
.remove = __devexit_p(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");
|