diff options
Diffstat (limited to 'drivers/staging/iio/meter/ade7753.c')
| -rw-r--r-- | drivers/staging/iio/meter/ade7753.c | 547 |
1 files changed, 547 insertions, 0 deletions
diff --git a/drivers/staging/iio/meter/ade7753.c b/drivers/staging/iio/meter/ade7753.c new file mode 100644 index 000000000..ffc7f0ddf --- /dev/null +++ b/drivers/staging/iio/meter/ade7753.c @@ -0,0 +1,547 @@ +/* + * ADE7753 Single-Phase Multifunction Metering IC with di/dt Sensor Interface + * + * 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 "ade7753.h" + +static int ade7753_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 ade7753_state *st = iio_priv(indio_dev); + + mutex_lock(&st->buf_lock); + st->tx[0] = ADE7753_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 ade7753_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 ade7753_state *st = iio_priv(indio_dev); + + mutex_lock(&st->buf_lock); + st->tx[0] = ADE7753_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 ade7753_spi_read_reg_8(struct device *dev, + u8 reg_address, + u8 *val) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct ade7753_state *st = iio_priv(indio_dev); + ssize_t ret; + + ret = spi_w8r8(st->us, ADE7753_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 ade7753_spi_read_reg_16(struct device *dev, + u8 reg_address, + u16 *val) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct ade7753_state *st = iio_priv(indio_dev); + ssize_t ret; + + ret = spi_w8r16be(st->us, ADE7753_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 ade7753_spi_read_reg_24(struct device *dev, + u8 reg_address, + u32 *val) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct ade7753_state *st = iio_priv(indio_dev); + int ret; + struct spi_transfer xfers[] = { + { + .tx_buf = st->tx, + .bits_per_word = 8, + .len = 1, + }, { + .rx_buf = st->tx, + .bits_per_word = 8, + .len = 3, + } + }; + + mutex_lock(&st->buf_lock); + st->tx[0] = ADE7753_READ_REG(reg_address); + + ret = spi_sync_transfer(st->us, xfers, ARRAY_SIZE(xfers)); + if (ret) { + dev_err(&st->us->dev, "problem when reading 24 bit register 0x%02X", + reg_address); + goto error_ret; + } + *val = (st->rx[0] << 16) | (st->rx[1] << 8) | st->rx[2]; + +error_ret: + mutex_unlock(&st->buf_lock); + return ret; +} + +static ssize_t ade7753_read_8bit(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int ret; + u8 val; + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + + ret = ade7753_spi_read_reg_8(dev, this_attr->address, &val); + if (ret) + return ret; + + return sprintf(buf, "%u\n", val); +} + +static ssize_t ade7753_read_16bit(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int ret; + u16 val; + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + + ret = ade7753_spi_read_reg_16(dev, this_attr->address, &val); + if (ret) + return ret; + + return sprintf(buf, "%u\n", val); +} + +static ssize_t ade7753_read_24bit(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int ret; + u32 val; + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + + ret = ade7753_spi_read_reg_24(dev, this_attr->address, &val); + if (ret) + return ret; + + return sprintf(buf, "%u\n", val); +} + +static ssize_t ade7753_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 = ade7753_spi_write_reg_8(dev, this_attr->address, val); + +error_ret: + return ret ? ret : len; +} + +static ssize_t ade7753_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 = ade7753_spi_write_reg_16(dev, this_attr->address, val); + +error_ret: + return ret ? ret : len; +} + +static int ade7753_reset(struct device *dev) +{ + u16 val; + + ade7753_spi_read_reg_16(dev, ADE7753_MODE, &val); + val |= 1 << 6; /* Software Chip Reset */ + + return ade7753_spi_write_reg_16(dev, ADE7753_MODE, val); +} + +static IIO_DEV_ATTR_AENERGY(ade7753_read_24bit, ADE7753_AENERGY); +static IIO_DEV_ATTR_LAENERGY(ade7753_read_24bit, ADE7753_LAENERGY); +static IIO_DEV_ATTR_VAENERGY(ade7753_read_24bit, ADE7753_VAENERGY); +static IIO_DEV_ATTR_LVAENERGY(ade7753_read_24bit, ADE7753_LVAENERGY); +static IIO_DEV_ATTR_CFDEN(S_IWUSR | S_IRUGO, + ade7753_read_16bit, + ade7753_write_16bit, + ADE7753_CFDEN); +static IIO_DEV_ATTR_CFNUM(S_IWUSR | S_IRUGO, + ade7753_read_8bit, + ade7753_write_8bit, + ADE7753_CFNUM); +static IIO_DEV_ATTR_CHKSUM(ade7753_read_8bit, ADE7753_CHKSUM); +static IIO_DEV_ATTR_PHCAL(S_IWUSR | S_IRUGO, + ade7753_read_16bit, + ade7753_write_16bit, + ADE7753_PHCAL); +static IIO_DEV_ATTR_APOS(S_IWUSR | S_IRUGO, + ade7753_read_16bit, + ade7753_write_16bit, + ADE7753_APOS); +static IIO_DEV_ATTR_SAGCYC(S_IWUSR | S_IRUGO, + ade7753_read_8bit, + ade7753_write_8bit, + ADE7753_SAGCYC); +static IIO_DEV_ATTR_SAGLVL(S_IWUSR | S_IRUGO, + ade7753_read_8bit, + ade7753_write_8bit, + ADE7753_SAGLVL); +static IIO_DEV_ATTR_LINECYC(S_IWUSR | S_IRUGO, + ade7753_read_8bit, + ade7753_write_8bit, + ADE7753_LINECYC); +static IIO_DEV_ATTR_WDIV(S_IWUSR | S_IRUGO, + ade7753_read_8bit, + ade7753_write_8bit, + ADE7753_WDIV); +static IIO_DEV_ATTR_IRMS(S_IWUSR | S_IRUGO, + ade7753_read_24bit, + NULL, + ADE7753_IRMS); +static IIO_DEV_ATTR_VRMS(S_IRUGO, + ade7753_read_24bit, + NULL, + ADE7753_VRMS); +static IIO_DEV_ATTR_IRMSOS(S_IWUSR | S_IRUGO, + ade7753_read_16bit, + ade7753_write_16bit, + ADE7753_IRMSOS); +static IIO_DEV_ATTR_VRMSOS(S_IWUSR | S_IRUGO, + ade7753_read_16bit, + ade7753_write_16bit, + ADE7753_VRMSOS); +static IIO_DEV_ATTR_WGAIN(S_IWUSR | S_IRUGO, + ade7753_read_16bit, + ade7753_write_16bit, + ADE7753_WGAIN); +static IIO_DEV_ATTR_VAGAIN(S_IWUSR | S_IRUGO, + ade7753_read_16bit, + ade7753_write_16bit, + ADE7753_VAGAIN); +static IIO_DEV_ATTR_PGA_GAIN(S_IWUSR | S_IRUGO, + ade7753_read_16bit, + ade7753_write_16bit, + ADE7753_GAIN); +static IIO_DEV_ATTR_IPKLVL(S_IWUSR | S_IRUGO, + ade7753_read_8bit, + ade7753_write_8bit, + ADE7753_IPKLVL); +static IIO_DEV_ATTR_VPKLVL(S_IWUSR | S_IRUGO, + ade7753_read_8bit, + ade7753_write_8bit, + ADE7753_VPKLVL); +static IIO_DEV_ATTR_IPEAK(S_IRUGO, + ade7753_read_24bit, + NULL, + ADE7753_IPEAK); +static IIO_DEV_ATTR_VPEAK(S_IRUGO, + ade7753_read_24bit, + NULL, + ADE7753_VPEAK); +static IIO_DEV_ATTR_VPERIOD(S_IRUGO, + ade7753_read_16bit, + NULL, + ADE7753_PERIOD); +static IIO_DEV_ATTR_CH_OFF(1, S_IWUSR | S_IRUGO, + ade7753_read_8bit, + ade7753_write_8bit, + ADE7753_CH1OS); +static IIO_DEV_ATTR_CH_OFF(2, S_IWUSR | S_IRUGO, + ade7753_read_8bit, + ade7753_write_8bit, + ADE7753_CH2OS); + +static int ade7753_set_irq(struct device *dev, bool enable) +{ + int ret; + u8 irqen; + + ret = ade7753_spi_read_reg_8(dev, ADE7753_IRQEN, &irqen); + if (ret) + goto error_ret; + + if (enable) + irqen |= 1 << 3; /* Enables an interrupt when a data is + present in the waveform register */ + else + irqen &= ~(1 << 3); + + ret = ade7753_spi_write_reg_8(dev, ADE7753_IRQEN, irqen); + +error_ret: + return ret; +} + +/* Power down the device */ +static int ade7753_stop_device(struct device *dev) +{ + u16 val; + + ade7753_spi_read_reg_16(dev, ADE7753_MODE, &val); + val |= 1 << 4; /* AD converters can be turned off */ + + return ade7753_spi_write_reg_16(dev, ADE7753_MODE, val); +} + +static int ade7753_initial_setup(struct iio_dev *indio_dev) +{ + int ret; + struct device *dev = &indio_dev->dev; + struct ade7753_state *st = iio_priv(indio_dev); + + /* use low spi speed for init */ + st->us->mode = SPI_MODE_3; + spi_setup(st->us); + + /* Disable IRQ */ + ret = ade7753_set_irq(dev, false); + if (ret) { + dev_err(dev, "disable irq failed"); + goto err_ret; + } + + ade7753_reset(dev); + msleep(ADE7753_STARTUP_DELAY); + +err_ret: + return ret; +} + +static ssize_t ade7753_read_frequency(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int ret; + u16 t; + int sps; + + ret = ade7753_spi_read_reg_16(dev, ADE7753_MODE, &t); + if (ret) + return ret; + + t = (t >> 11) & 0x3; + sps = 27900 / (1 + t); + + return sprintf(buf, "%d\n", sps); +} + +static ssize_t ade7753_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 ade7753_state *st = iio_priv(indio_dev); + u16 val; + int ret; + u16 reg, t; + + ret = kstrtou16(buf, 10, &val); + if (ret) + return ret; + if (val == 0) + return -EINVAL; + + mutex_lock(&indio_dev->mlock); + + t = 27900 / val; + if (t > 0) + t--; + + if (t > 1) + st->us->max_speed_hz = ADE7753_SPI_SLOW; + else + st->us->max_speed_hz = ADE7753_SPI_FAST; + + ret = ade7753_spi_read_reg_16(dev, ADE7753_MODE, ®); + if (ret) + goto out; + + reg &= ~(3 << 11); + reg |= t << 11; + + ret = ade7753_spi_write_reg_16(dev, ADE7753_MODE, reg); + +out: + mutex_unlock(&indio_dev->mlock); + + return ret ? ret : len; +} + +static IIO_DEV_ATTR_TEMP_RAW(ade7753_read_8bit); +static IIO_CONST_ATTR(in_temp_offset, "-25 C"); +static IIO_CONST_ATTR(in_temp_scale, "0.67 C"); + +static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO, + ade7753_read_frequency, + ade7753_write_frequency); + +static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("27900 14000 7000 3500"); + +static struct attribute *ade7753_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_laenergy.dev_attr.attr, + &iio_dev_attr_vaenergy.dev_attr.attr, + &iio_dev_attr_lvaenergy.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_chksum.dev_attr.attr, + &iio_dev_attr_pga_gain.dev_attr.attr, + &iio_dev_attr_wgain.dev_attr.attr, + &iio_dev_attr_choff_1.dev_attr.attr, + &iio_dev_attr_choff_2.dev_attr.attr, + &iio_dev_attr_wdiv.dev_attr.attr, + &iio_dev_attr_irms.dev_attr.attr, + &iio_dev_attr_vrms.dev_attr.attr, + &iio_dev_attr_irmsos.dev_attr.attr, + &iio_dev_attr_vrmsos.dev_attr.attr, + &iio_dev_attr_vagain.dev_attr.attr, + &iio_dev_attr_ipklvl.dev_attr.attr, + &iio_dev_attr_vpklvl.dev_attr.attr, + &iio_dev_attr_ipeak.dev_attr.attr, + &iio_dev_attr_vpeak.dev_attr.attr, + &iio_dev_attr_vperiod.dev_attr.attr, + NULL, +}; + +static const struct attribute_group ade7753_attribute_group = { + .attrs = ade7753_attributes, +}; + +static const struct iio_info ade7753_info = { + .attrs = &ade7753_attribute_group, + .driver_module = THIS_MODULE, +}; + +static int ade7753_probe(struct spi_device *spi) +{ + int ret; + struct ade7753_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 = &ade7753_info; + indio_dev->modes = INDIO_DIRECT_MODE; + + /* Get the device into a sane initial state */ + ret = ade7753_initial_setup(indio_dev); + if (ret) + return ret; + + return iio_device_register(indio_dev); +} + +/* fixme, confirm ordering in this function */ +static int ade7753_remove(struct spi_device *spi) +{ + struct iio_dev *indio_dev = spi_get_drvdata(spi); + + iio_device_unregister(indio_dev); + ade7753_stop_device(&indio_dev->dev); + + return 0; +} + +static struct spi_driver ade7753_driver = { + .driver = { + .name = "ade7753", + .owner = THIS_MODULE, + }, + .probe = ade7753_probe, + .remove = ade7753_remove, +}; +module_spi_driver(ade7753_driver); + +MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); +MODULE_DESCRIPTION("Analog Devices ADE7753/6 Single-Phase Multifunction Meter"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("spi:ade7753"); |