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- /*
- * 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");
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