diff options
Diffstat (limited to 'drivers/staging/iio/frequency/ad9834.c')
| -rw-r--r-- | drivers/staging/iio/frequency/ad9834.c | 464 |
1 files changed, 464 insertions, 0 deletions
diff --git a/drivers/staging/iio/frequency/ad9834.c b/drivers/staging/iio/frequency/ad9834.c new file mode 100644 index 000000000000..1b2dc741d2ce --- /dev/null +++ b/drivers/staging/iio/frequency/ad9834.c @@ -0,0 +1,464 @@ +/* + * 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) (1 << 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 > (1 << 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; + long val; + + ret = strict_strtoul(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 == 0) + 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 __devinit 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 = regulator_get(&spi->dev, "vcc"); + if (!IS_ERR(reg)) { + ret = regulator_enable(reg); + if (ret) + goto error_put_reg; + } + + indio_dev = iio_device_alloc(sizeof(*st)); + if (indio_dev == NULL) { + 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_free_device; + } + + ret = ad9834_write_frequency(st, AD9834_REG_FREQ0, pdata->freq0); + if (ret) + goto error_free_device; + + ret = ad9834_write_frequency(st, AD9834_REG_FREQ1, pdata->freq1); + if (ret) + goto error_free_device; + + ret = ad9834_write_phase(st, AD9834_REG_PHASE0, pdata->phase0); + if (ret) + goto error_free_device; + + ret = ad9834_write_phase(st, AD9834_REG_PHASE1, pdata->phase1); + if (ret) + goto error_free_device; + + ret = iio_device_register(indio_dev); + if (ret) + goto error_free_device; + + return 0; + +error_free_device: + iio_device_free(indio_dev); +error_disable_reg: + if (!IS_ERR(reg)) + regulator_disable(reg); +error_put_reg: + if (!IS_ERR(reg)) + regulator_put(reg); + return ret; +} + +static int __devexit 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); + regulator_put(st->reg); + } + iio_device_free(indio_dev); + + 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", + .owner = THIS_MODULE, + }, + .probe = ad9834_probe, + .remove = __devexit_p(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"); |