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- /*
- * AD9833/AD9834/AD9837/AD9838 SPI DDS driver
- *
- * Copyright 2010-2011 Analog Devices Inc.
- *
- * Licensed under the GPL-2.
- */
- #include <linux/interrupt.h>
- #include <linux/workqueue.h>
- #include <linux/device.h>
- #include <linux/kernel.h>
- #include <linux/slab.h>
- #include <linux/sysfs.h>
- #include <linux/list.h>
- #include <linux/spi/spi.h>
- #include <linux/regulator/consumer.h>
- #include <linux/err.h>
- #include <linux/module.h>
- #include <asm/div64.h>
- #include <linux/iio/iio.h>
- #include <linux/iio/sysfs.h>
- #include "dds.h"
- #include "ad9834.h"
- static unsigned int ad9834_calc_freqreg(unsigned long mclk, unsigned long fout)
- {
- unsigned long long freqreg = (u64)fout * (u64)BIT(AD9834_FREQ_BITS);
- do_div(freqreg, mclk);
- return freqreg;
- }
- static int ad9834_write_frequency(struct ad9834_state *st,
- unsigned long addr, unsigned long fout)
- {
- unsigned long regval;
- if (fout > (st->mclk / 2))
- return -EINVAL;
- regval = ad9834_calc_freqreg(st->mclk, fout);
- st->freq_data[0] = cpu_to_be16(addr | (regval &
- RES_MASK(AD9834_FREQ_BITS / 2)));
- st->freq_data[1] = cpu_to_be16(addr | ((regval >>
- (AD9834_FREQ_BITS / 2)) &
- RES_MASK(AD9834_FREQ_BITS / 2)));
- return spi_sync(st->spi, &st->freq_msg);
- }
- static int ad9834_write_phase(struct ad9834_state *st,
- unsigned long addr, unsigned long phase)
- {
- if (phase > BIT(AD9834_PHASE_BITS))
- return -EINVAL;
- st->data = cpu_to_be16(addr | phase);
- return spi_sync(st->spi, &st->msg);
- }
- static ssize_t ad9834_write(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
- {
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct ad9834_state *st = iio_priv(indio_dev);
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
- int ret;
- unsigned long val;
- ret = kstrtoul(buf, 10, &val);
- if (ret)
- goto error_ret;
- mutex_lock(&indio_dev->mlock);
- switch ((u32)this_attr->address) {
- case AD9834_REG_FREQ0:
- case AD9834_REG_FREQ1:
- ret = ad9834_write_frequency(st, this_attr->address, val);
- break;
- case AD9834_REG_PHASE0:
- case AD9834_REG_PHASE1:
- ret = ad9834_write_phase(st, this_attr->address, val);
- break;
- case AD9834_OPBITEN:
- if (st->control & AD9834_MODE) {
- ret = -EINVAL; /* AD9843 reserved mode */
- break;
- }
- if (val)
- st->control |= AD9834_OPBITEN;
- else
- st->control &= ~AD9834_OPBITEN;
- st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
- ret = spi_sync(st->spi, &st->msg);
- break;
- case AD9834_PIN_SW:
- if (val)
- st->control |= AD9834_PIN_SW;
- else
- st->control &= ~AD9834_PIN_SW;
- st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
- ret = spi_sync(st->spi, &st->msg);
- break;
- case AD9834_FSEL:
- case AD9834_PSEL:
- if (!val) {
- st->control &= ~(this_attr->address | AD9834_PIN_SW);
- } else if (val == 1) {
- st->control |= this_attr->address;
- st->control &= ~AD9834_PIN_SW;
- } else {
- ret = -EINVAL;
- break;
- }
- st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
- ret = spi_sync(st->spi, &st->msg);
- break;
- case AD9834_RESET:
- if (val)
- st->control &= ~AD9834_RESET;
- else
- st->control |= AD9834_RESET;
- st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
- ret = spi_sync(st->spi, &st->msg);
- break;
- default:
- ret = -ENODEV;
- }
- mutex_unlock(&indio_dev->mlock);
- error_ret:
- return ret ? ret : len;
- }
- static ssize_t ad9834_store_wavetype(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
- {
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct ad9834_state *st = iio_priv(indio_dev);
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
- int ret = 0;
- bool is_ad9833_7 = (st->devid == ID_AD9833) || (st->devid == ID_AD9837);
- mutex_lock(&indio_dev->mlock);
- switch ((u32)this_attr->address) {
- case 0:
- if (sysfs_streq(buf, "sine")) {
- st->control &= ~AD9834_MODE;
- if (is_ad9833_7)
- st->control &= ~AD9834_OPBITEN;
- } else if (sysfs_streq(buf, "triangle")) {
- if (is_ad9833_7) {
- st->control &= ~AD9834_OPBITEN;
- st->control |= AD9834_MODE;
- } else if (st->control & AD9834_OPBITEN) {
- ret = -EINVAL; /* AD9843 reserved mode */
- } else {
- st->control |= AD9834_MODE;
- }
- } else if (is_ad9833_7 && sysfs_streq(buf, "square")) {
- st->control &= ~AD9834_MODE;
- st->control |= AD9834_OPBITEN;
- } else {
- ret = -EINVAL;
- }
- break;
- case 1:
- if (sysfs_streq(buf, "square") &&
- !(st->control & AD9834_MODE)) {
- st->control &= ~AD9834_MODE;
- st->control |= AD9834_OPBITEN;
- } else {
- ret = -EINVAL;
- }
- break;
- default:
- ret = -EINVAL;
- break;
- }
- if (!ret) {
- st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
- ret = spi_sync(st->spi, &st->msg);
- }
- mutex_unlock(&indio_dev->mlock);
- return ret ? ret : len;
- }
- static
- ssize_t ad9834_show_out0_wavetype_available(struct device *dev,
- struct device_attribute *attr,
- char *buf)
- {
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct ad9834_state *st = iio_priv(indio_dev);
- char *str;
- if ((st->devid == ID_AD9833) || (st->devid == ID_AD9837))
- str = "sine triangle square";
- else if (st->control & AD9834_OPBITEN)
- str = "sine";
- else
- str = "sine triangle";
- return sprintf(buf, "%s\n", str);
- }
- static IIO_DEVICE_ATTR(out_altvoltage0_out0_wavetype_available, S_IRUGO,
- ad9834_show_out0_wavetype_available, NULL, 0);
- static
- ssize_t ad9834_show_out1_wavetype_available(struct device *dev,
- struct device_attribute *attr,
- char *buf)
- {
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct ad9834_state *st = iio_priv(indio_dev);
- char *str;
- if (st->control & AD9834_MODE)
- str = "";
- else
- str = "square";
- return sprintf(buf, "%s\n", str);
- }
- static IIO_DEVICE_ATTR(out_altvoltage0_out1_wavetype_available, S_IRUGO,
- ad9834_show_out1_wavetype_available, NULL, 0);
- /**
- * see dds.h for further information
- */
- static IIO_DEV_ATTR_FREQ(0, 0, S_IWUSR, NULL, ad9834_write, AD9834_REG_FREQ0);
- static IIO_DEV_ATTR_FREQ(0, 1, S_IWUSR, NULL, ad9834_write, AD9834_REG_FREQ1);
- static IIO_DEV_ATTR_FREQSYMBOL(0, S_IWUSR, NULL, ad9834_write, AD9834_FSEL);
- static IIO_CONST_ATTR_FREQ_SCALE(0, "1"); /* 1Hz */
- static IIO_DEV_ATTR_PHASE(0, 0, S_IWUSR, NULL, ad9834_write, AD9834_REG_PHASE0);
- static IIO_DEV_ATTR_PHASE(0, 1, S_IWUSR, NULL, ad9834_write, AD9834_REG_PHASE1);
- static IIO_DEV_ATTR_PHASESYMBOL(0, S_IWUSR, NULL, ad9834_write, AD9834_PSEL);
- static IIO_CONST_ATTR_PHASE_SCALE(0, "0.0015339808"); /* 2PI/2^12 rad*/
- static IIO_DEV_ATTR_PINCONTROL_EN(0, S_IWUSR, NULL,
- ad9834_write, AD9834_PIN_SW);
- static IIO_DEV_ATTR_OUT_ENABLE(0, S_IWUSR, NULL, ad9834_write, AD9834_RESET);
- static IIO_DEV_ATTR_OUTY_ENABLE(0, 1, S_IWUSR, NULL,
- ad9834_write, AD9834_OPBITEN);
- static IIO_DEV_ATTR_OUT_WAVETYPE(0, 0, ad9834_store_wavetype, 0);
- static IIO_DEV_ATTR_OUT_WAVETYPE(0, 1, ad9834_store_wavetype, 1);
- static struct attribute *ad9834_attributes[] = {
- &iio_dev_attr_out_altvoltage0_frequency0.dev_attr.attr,
- &iio_dev_attr_out_altvoltage0_frequency1.dev_attr.attr,
- &iio_const_attr_out_altvoltage0_frequency_scale.dev_attr.attr,
- &iio_dev_attr_out_altvoltage0_phase0.dev_attr.attr,
- &iio_dev_attr_out_altvoltage0_phase1.dev_attr.attr,
- &iio_const_attr_out_altvoltage0_phase_scale.dev_attr.attr,
- &iio_dev_attr_out_altvoltage0_pincontrol_en.dev_attr.attr,
- &iio_dev_attr_out_altvoltage0_frequencysymbol.dev_attr.attr,
- &iio_dev_attr_out_altvoltage0_phasesymbol.dev_attr.attr,
- &iio_dev_attr_out_altvoltage0_out_enable.dev_attr.attr,
- &iio_dev_attr_out_altvoltage0_out1_enable.dev_attr.attr,
- &iio_dev_attr_out_altvoltage0_out0_wavetype.dev_attr.attr,
- &iio_dev_attr_out_altvoltage0_out1_wavetype.dev_attr.attr,
- &iio_dev_attr_out_altvoltage0_out0_wavetype_available.dev_attr.attr,
- &iio_dev_attr_out_altvoltage0_out1_wavetype_available.dev_attr.attr,
- NULL,
- };
- static struct attribute *ad9833_attributes[] = {
- &iio_dev_attr_out_altvoltage0_frequency0.dev_attr.attr,
- &iio_dev_attr_out_altvoltage0_frequency1.dev_attr.attr,
- &iio_const_attr_out_altvoltage0_frequency_scale.dev_attr.attr,
- &iio_dev_attr_out_altvoltage0_phase0.dev_attr.attr,
- &iio_dev_attr_out_altvoltage0_phase1.dev_attr.attr,
- &iio_const_attr_out_altvoltage0_phase_scale.dev_attr.attr,
- &iio_dev_attr_out_altvoltage0_frequencysymbol.dev_attr.attr,
- &iio_dev_attr_out_altvoltage0_phasesymbol.dev_attr.attr,
- &iio_dev_attr_out_altvoltage0_out_enable.dev_attr.attr,
- &iio_dev_attr_out_altvoltage0_out0_wavetype.dev_attr.attr,
- &iio_dev_attr_out_altvoltage0_out0_wavetype_available.dev_attr.attr,
- NULL,
- };
- static const struct attribute_group ad9834_attribute_group = {
- .attrs = ad9834_attributes,
- };
- static const struct attribute_group ad9833_attribute_group = {
- .attrs = ad9833_attributes,
- };
- static const struct iio_info ad9834_info = {
- .attrs = &ad9834_attribute_group,
- .driver_module = THIS_MODULE,
- };
- static const struct iio_info ad9833_info = {
- .attrs = &ad9833_attribute_group,
- .driver_module = THIS_MODULE,
- };
- static int ad9834_probe(struct spi_device *spi)
- {
- struct ad9834_platform_data *pdata = spi->dev.platform_data;
- struct ad9834_state *st;
- struct iio_dev *indio_dev;
- struct regulator *reg;
- int ret;
- if (!pdata) {
- dev_dbg(&spi->dev, "no platform data?\n");
- return -ENODEV;
- }
- reg = devm_regulator_get(&spi->dev, "vcc");
- if (!IS_ERR(reg)) {
- ret = regulator_enable(reg);
- if (ret)
- return ret;
- }
- indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
- if (!indio_dev) {
- ret = -ENOMEM;
- goto error_disable_reg;
- }
- spi_set_drvdata(spi, indio_dev);
- st = iio_priv(indio_dev);
- st->mclk = pdata->mclk;
- st->spi = spi;
- st->devid = spi_get_device_id(spi)->driver_data;
- st->reg = reg;
- indio_dev->dev.parent = &spi->dev;
- indio_dev->name = spi_get_device_id(spi)->name;
- switch (st->devid) {
- case ID_AD9833:
- case ID_AD9837:
- indio_dev->info = &ad9833_info;
- break;
- default:
- indio_dev->info = &ad9834_info;
- break;
- }
- indio_dev->modes = INDIO_DIRECT_MODE;
- /* Setup default messages */
- st->xfer.tx_buf = &st->data;
- st->xfer.len = 2;
- spi_message_init(&st->msg);
- spi_message_add_tail(&st->xfer, &st->msg);
- st->freq_xfer[0].tx_buf = &st->freq_data[0];
- st->freq_xfer[0].len = 2;
- st->freq_xfer[0].cs_change = 1;
- st->freq_xfer[1].tx_buf = &st->freq_data[1];
- st->freq_xfer[1].len = 2;
- spi_message_init(&st->freq_msg);
- spi_message_add_tail(&st->freq_xfer[0], &st->freq_msg);
- spi_message_add_tail(&st->freq_xfer[1], &st->freq_msg);
- st->control = AD9834_B28 | AD9834_RESET;
- if (!pdata->en_div2)
- st->control |= AD9834_DIV2;
- if (!pdata->en_signbit_msb_out && (st->devid == ID_AD9834))
- st->control |= AD9834_SIGN_PIB;
- st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
- ret = spi_sync(st->spi, &st->msg);
- if (ret) {
- dev_err(&spi->dev, "device init failed\n");
- goto error_disable_reg;
- }
- ret = ad9834_write_frequency(st, AD9834_REG_FREQ0, pdata->freq0);
- if (ret)
- goto error_disable_reg;
- ret = ad9834_write_frequency(st, AD9834_REG_FREQ1, pdata->freq1);
- if (ret)
- goto error_disable_reg;
- ret = ad9834_write_phase(st, AD9834_REG_PHASE0, pdata->phase0);
- if (ret)
- goto error_disable_reg;
- ret = ad9834_write_phase(st, AD9834_REG_PHASE1, pdata->phase1);
- if (ret)
- goto error_disable_reg;
- ret = iio_device_register(indio_dev);
- if (ret)
- goto error_disable_reg;
- return 0;
- error_disable_reg:
- if (!IS_ERR(reg))
- regulator_disable(reg);
- return ret;
- }
- static int ad9834_remove(struct spi_device *spi)
- {
- struct iio_dev *indio_dev = spi_get_drvdata(spi);
- struct ad9834_state *st = iio_priv(indio_dev);
- iio_device_unregister(indio_dev);
- if (!IS_ERR(st->reg))
- regulator_disable(st->reg);
- return 0;
- }
- static const struct spi_device_id ad9834_id[] = {
- {"ad9833", ID_AD9833},
- {"ad9834", ID_AD9834},
- {"ad9837", ID_AD9837},
- {"ad9838", ID_AD9838},
- {}
- };
- MODULE_DEVICE_TABLE(spi, ad9834_id);
- static struct spi_driver ad9834_driver = {
- .driver = {
- .name = "ad9834",
- },
- .probe = ad9834_probe,
- .remove = ad9834_remove,
- .id_table = ad9834_id,
- };
- module_spi_driver(ad9834_driver);
- MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
- MODULE_DESCRIPTION("Analog Devices AD9833/AD9834/AD9837/AD9838 DDS");
- MODULE_LICENSE("GPL v2");
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