| /* |
| * 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"); |