| /* |
| * ADE7754 Polyphase Multifunction Energy Metering IC 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 "ade7754.h" |
| |
| static int ade7754_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 ade7754_state *st = iio_priv(indio_dev); |
| |
| mutex_lock(&st->buf_lock); |
| st->tx[0] = ADE7754_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 ade7754_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 ade7754_state *st = iio_priv(indio_dev); |
| |
| mutex_lock(&st->buf_lock); |
| st->tx[0] = ADE7754_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 ade7754_spi_read_reg_8(struct device *dev, |
| u8 reg_address, |
| u8 *val) |
| { |
| struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
| struct ade7754_state *st = iio_priv(indio_dev); |
| int ret; |
| |
| ret = spi_w8r8(st->us, ADE7754_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 ade7754_spi_read_reg_16(struct device *dev, |
| u8 reg_address, |
| u16 *val) |
| { |
| struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
| struct ade7754_state *st = iio_priv(indio_dev); |
| int ret; |
| |
| ret = spi_w8r16be(st->us, ADE7754_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 ade7754_spi_read_reg_24(struct device *dev, |
| u8 reg_address, |
| u32 *val) |
| { |
| struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
| struct ade7754_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 = 4, |
| }, |
| }; |
| |
| mutex_lock(&st->buf_lock); |
| st->tx[0] = ADE7754_READ_REG(reg_address); |
| st->tx[1] = 0; |
| st->tx[2] = 0; |
| st->tx[3] = 0; |
| |
| 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[1] << 16) | (st->rx[2] << 8) | st->rx[3]; |
| |
| error_ret: |
| mutex_unlock(&st->buf_lock); |
| return ret; |
| } |
| |
| static ssize_t ade7754_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 = ade7754_spi_read_reg_8(dev, this_attr->address, &val); |
| if (ret) |
| return ret; |
| |
| return sprintf(buf, "%u\n", val); |
| } |
| |
| static ssize_t ade7754_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 = ade7754_spi_read_reg_16(dev, this_attr->address, &val); |
| if (ret) |
| return ret; |
| |
| return sprintf(buf, "%u\n", val); |
| } |
| |
| static ssize_t ade7754_read_24bit(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| int ret; |
| u32 val = 0; |
| struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| |
| ret = ade7754_spi_read_reg_24(dev, this_attr->address, &val); |
| if (ret) |
| return ret; |
| |
| return sprintf(buf, "%u\n", val & 0xFFFFFF); |
| } |
| |
| static ssize_t ade7754_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 = ade7754_spi_write_reg_8(dev, this_attr->address, val); |
| |
| error_ret: |
| return ret ? ret : len; |
| } |
| |
| static ssize_t ade7754_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 = ade7754_spi_write_reg_16(dev, this_attr->address, val); |
| |
| error_ret: |
| return ret ? ret : len; |
| } |
| |
| static int ade7754_reset(struct device *dev) |
| { |
| int ret; |
| u8 val; |
| |
| ret = ade7754_spi_read_reg_8(dev, ADE7754_OPMODE, &val); |
| if (ret < 0) |
| return ret; |
| |
| val |= BIT(6); /* Software Chip Reset */ |
| return ade7754_spi_write_reg_8(dev, ADE7754_OPMODE, val); |
| } |
| |
| static IIO_DEV_ATTR_AENERGY(ade7754_read_24bit, ADE7754_AENERGY); |
| static IIO_DEV_ATTR_LAENERGY(ade7754_read_24bit, ADE7754_LAENERGY); |
| static IIO_DEV_ATTR_VAENERGY(ade7754_read_24bit, ADE7754_VAENERGY); |
| static IIO_DEV_ATTR_LVAENERGY(ade7754_read_24bit, ADE7754_LVAENERGY); |
| static IIO_DEV_ATTR_VPEAK(S_IWUSR | S_IRUGO, |
| ade7754_read_8bit, |
| ade7754_write_8bit, |
| ADE7754_VPEAK); |
| static IIO_DEV_ATTR_IPEAK(S_IWUSR | S_IRUGO, |
| ade7754_read_8bit, |
| ade7754_write_8bit, |
| ADE7754_VPEAK); |
| static IIO_DEV_ATTR_APHCAL(S_IWUSR | S_IRUGO, |
| ade7754_read_8bit, |
| ade7754_write_8bit, |
| ADE7754_APHCAL); |
| static IIO_DEV_ATTR_BPHCAL(S_IWUSR | S_IRUGO, |
| ade7754_read_8bit, |
| ade7754_write_8bit, |
| ADE7754_BPHCAL); |
| static IIO_DEV_ATTR_CPHCAL(S_IWUSR | S_IRUGO, |
| ade7754_read_8bit, |
| ade7754_write_8bit, |
| ADE7754_CPHCAL); |
| static IIO_DEV_ATTR_AAPOS(S_IWUSR | S_IRUGO, |
| ade7754_read_16bit, |
| ade7754_write_16bit, |
| ADE7754_AAPOS); |
| static IIO_DEV_ATTR_BAPOS(S_IWUSR | S_IRUGO, |
| ade7754_read_16bit, |
| ade7754_write_16bit, |
| ADE7754_BAPOS); |
| static IIO_DEV_ATTR_CAPOS(S_IWUSR | S_IRUGO, |
| ade7754_read_16bit, |
| ade7754_write_16bit, |
| ADE7754_CAPOS); |
| static IIO_DEV_ATTR_WDIV(S_IWUSR | S_IRUGO, |
| ade7754_read_8bit, |
| ade7754_write_8bit, |
| ADE7754_WDIV); |
| static IIO_DEV_ATTR_VADIV(S_IWUSR | S_IRUGO, |
| ade7754_read_8bit, |
| ade7754_write_8bit, |
| ADE7754_VADIV); |
| static IIO_DEV_ATTR_CFNUM(S_IWUSR | S_IRUGO, |
| ade7754_read_16bit, |
| ade7754_write_16bit, |
| ADE7754_CFNUM); |
| static IIO_DEV_ATTR_CFDEN(S_IWUSR | S_IRUGO, |
| ade7754_read_16bit, |
| ade7754_write_16bit, |
| ADE7754_CFDEN); |
| static IIO_DEV_ATTR_ACTIVE_POWER_A_GAIN(S_IWUSR | S_IRUGO, |
| ade7754_read_16bit, |
| ade7754_write_16bit, |
| ADE7754_AAPGAIN); |
| static IIO_DEV_ATTR_ACTIVE_POWER_B_GAIN(S_IWUSR | S_IRUGO, |
| ade7754_read_16bit, |
| ade7754_write_16bit, |
| ADE7754_BAPGAIN); |
| static IIO_DEV_ATTR_ACTIVE_POWER_C_GAIN(S_IWUSR | S_IRUGO, |
| ade7754_read_16bit, |
| ade7754_write_16bit, |
| ADE7754_CAPGAIN); |
| static IIO_DEV_ATTR_AIRMS(S_IRUGO, |
| ade7754_read_24bit, |
| NULL, |
| ADE7754_AIRMS); |
| static IIO_DEV_ATTR_BIRMS(S_IRUGO, |
| ade7754_read_24bit, |
| NULL, |
| ADE7754_BIRMS); |
| static IIO_DEV_ATTR_CIRMS(S_IRUGO, |
| ade7754_read_24bit, |
| NULL, |
| ADE7754_CIRMS); |
| static IIO_DEV_ATTR_AVRMS(S_IRUGO, |
| ade7754_read_24bit, |
| NULL, |
| ADE7754_AVRMS); |
| static IIO_DEV_ATTR_BVRMS(S_IRUGO, |
| ade7754_read_24bit, |
| NULL, |
| ADE7754_BVRMS); |
| static IIO_DEV_ATTR_CVRMS(S_IRUGO, |
| ade7754_read_24bit, |
| NULL, |
| ADE7754_CVRMS); |
| static IIO_DEV_ATTR_AIRMSOS(S_IRUGO, |
| ade7754_read_16bit, |
| ade7754_write_16bit, |
| ADE7754_AIRMSOS); |
| static IIO_DEV_ATTR_BIRMSOS(S_IRUGO, |
| ade7754_read_16bit, |
| ade7754_write_16bit, |
| ADE7754_BIRMSOS); |
| static IIO_DEV_ATTR_CIRMSOS(S_IRUGO, |
| ade7754_read_16bit, |
| ade7754_write_16bit, |
| ADE7754_CIRMSOS); |
| static IIO_DEV_ATTR_AVRMSOS(S_IRUGO, |
| ade7754_read_16bit, |
| ade7754_write_16bit, |
| ADE7754_AVRMSOS); |
| static IIO_DEV_ATTR_BVRMSOS(S_IRUGO, |
| ade7754_read_16bit, |
| ade7754_write_16bit, |
| ADE7754_BVRMSOS); |
| static IIO_DEV_ATTR_CVRMSOS(S_IRUGO, |
| ade7754_read_16bit, |
| ade7754_write_16bit, |
| ADE7754_CVRMSOS); |
| |
| static int ade7754_set_irq(struct device *dev, bool enable) |
| { |
| int ret; |
| u16 irqen; |
| |
| ret = ade7754_spi_read_reg_16(dev, ADE7754_IRQEN, &irqen); |
| if (ret) |
| return ret; |
| |
| if (enable) |
| irqen |= BIT(14); /* Enables an interrupt when a data is |
| * present in the waveform register |
| */ |
| else |
| irqen &= ~BIT(14); |
| |
| ret = ade7754_spi_write_reg_16(dev, ADE7754_IRQEN, irqen); |
| |
| return ret; |
| } |
| |
| /* Power down the device */ |
| static int ade7754_stop_device(struct device *dev) |
| { |
| int ret; |
| u8 val; |
| |
| ret = ade7754_spi_read_reg_8(dev, ADE7754_OPMODE, &val); |
| if (ret < 0) { |
| dev_err(dev, "unable to power down the device, error: %d", |
| ret); |
| return ret; |
| } |
| |
| val |= 7 << 3; /* ADE7754 powered down */ |
| return ade7754_spi_write_reg_8(dev, ADE7754_OPMODE, val); |
| } |
| |
| static int ade7754_initial_setup(struct iio_dev *indio_dev) |
| { |
| int ret; |
| struct ade7754_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 = ade7754_set_irq(dev, false); |
| if (ret) { |
| dev_err(dev, "disable irq failed"); |
| goto err_ret; |
| } |
| |
| ade7754_reset(dev); |
| msleep(ADE7754_STARTUP_DELAY); |
| |
| err_ret: |
| return ret; |
| } |
| |
| static ssize_t ade7754_read_frequency(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| int ret; |
| u8 t; |
| int sps; |
| |
| ret = ade7754_spi_read_reg_8(dev, |
| ADE7754_WAVMODE, |
| &t); |
| if (ret) |
| return ret; |
| |
| t = (t >> 3) & 0x3; |
| sps = 26000 / (1 + t); |
| |
| return sprintf(buf, "%d\n", sps); |
| } |
| |
| static ssize_t ade7754_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 ade7754_state *st = iio_priv(indio_dev); |
| u16 val; |
| int ret; |
| u8 reg, t; |
| |
| ret = kstrtou16(buf, 10, &val); |
| if (ret) |
| return ret; |
| if (!val) |
| return -EINVAL; |
| |
| mutex_lock(&indio_dev->mlock); |
| |
| t = 26000 / val; |
| if (t > 0) |
| t--; |
| |
| if (t > 1) |
| st->us->max_speed_hz = ADE7754_SPI_SLOW; |
| else |
| st->us->max_speed_hz = ADE7754_SPI_FAST; |
| |
| ret = ade7754_spi_read_reg_8(dev, ADE7754_WAVMODE, ®); |
| if (ret) |
| goto out; |
| |
| reg &= ~(3 << 3); |
| reg |= t << 3; |
| |
| ret = ade7754_spi_write_reg_8(dev, ADE7754_WAVMODE, reg); |
| |
| out: |
| mutex_unlock(&indio_dev->mlock); |
| |
| return ret ? ret : len; |
| } |
| static IIO_DEV_ATTR_TEMP_RAW(ade7754_read_8bit); |
| static IIO_CONST_ATTR(in_temp_offset, "129 C"); |
| static IIO_CONST_ATTR(in_temp_scale, "4 C"); |
| |
| static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO, |
| ade7754_read_frequency, |
| ade7754_write_frequency); |
| |
| static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("26000 13000 65000 33000"); |
| |
| static struct attribute *ade7754_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_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_vpeak.dev_attr.attr, |
| &iio_dev_attr_ipeak.dev_attr.attr, |
| &iio_dev_attr_aphcal.dev_attr.attr, |
| &iio_dev_attr_bphcal.dev_attr.attr, |
| &iio_dev_attr_cphcal.dev_attr.attr, |
| &iio_dev_attr_aapos.dev_attr.attr, |
| &iio_dev_attr_bapos.dev_attr.attr, |
| &iio_dev_attr_capos.dev_attr.attr, |
| &iio_dev_attr_wdiv.dev_attr.attr, |
| &iio_dev_attr_vadiv.dev_attr.attr, |
| &iio_dev_attr_cfnum.dev_attr.attr, |
| &iio_dev_attr_cfden.dev_attr.attr, |
| &iio_dev_attr_active_power_a_gain.dev_attr.attr, |
| &iio_dev_attr_active_power_b_gain.dev_attr.attr, |
| &iio_dev_attr_active_power_c_gain.dev_attr.attr, |
| &iio_dev_attr_airms.dev_attr.attr, |
| &iio_dev_attr_birms.dev_attr.attr, |
| &iio_dev_attr_cirms.dev_attr.attr, |
| &iio_dev_attr_avrms.dev_attr.attr, |
| &iio_dev_attr_bvrms.dev_attr.attr, |
| &iio_dev_attr_cvrms.dev_attr.attr, |
| &iio_dev_attr_airmsos.dev_attr.attr, |
| &iio_dev_attr_birmsos.dev_attr.attr, |
| &iio_dev_attr_cirmsos.dev_attr.attr, |
| &iio_dev_attr_avrmsos.dev_attr.attr, |
| &iio_dev_attr_bvrmsos.dev_attr.attr, |
| &iio_dev_attr_cvrmsos.dev_attr.attr, |
| NULL, |
| }; |
| |
| static const struct attribute_group ade7754_attribute_group = { |
| .attrs = ade7754_attributes, |
| }; |
| |
| static const struct iio_info ade7754_info = { |
| .attrs = &ade7754_attribute_group, |
| .driver_module = THIS_MODULE, |
| }; |
| |
| static int ade7754_probe(struct spi_device *spi) |
| { |
| int ret; |
| struct ade7754_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 = &ade7754_info; |
| indio_dev->modes = INDIO_DIRECT_MODE; |
| |
| /* Get the device into a sane initial state */ |
| ret = ade7754_initial_setup(indio_dev); |
| if (ret) |
| goto powerdown_on_error; |
| ret = iio_device_register(indio_dev); |
| if (ret) |
| goto powerdown_on_error; |
| return ret; |
| |
| powerdown_on_error: |
| ade7754_stop_device(&indio_dev->dev); |
| return ret; |
| } |
| |
| static int ade7754_remove(struct spi_device *spi) |
| { |
| struct iio_dev *indio_dev = spi_get_drvdata(spi); |
| |
| iio_device_unregister(indio_dev); |
| ade7754_stop_device(&indio_dev->dev); |
| |
| return 0; |
| } |
| |
| static struct spi_driver ade7754_driver = { |
| .driver = { |
| .name = "ade7754", |
| }, |
| .probe = ade7754_probe, |
| .remove = ade7754_remove, |
| }; |
| module_spi_driver(ade7754_driver); |
| |
| MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); |
| MODULE_DESCRIPTION("Analog Devices ADE7754 Polyphase Multifunction Energy Metering IC Driver"); |
| MODULE_LICENSE("GPL v2"); |
| MODULE_ALIAS("spi:ad7754"); |