diff options
Diffstat (limited to 'drivers/staging/iio/frequency/ad9951.c')
-rw-r--r-- | drivers/staging/iio/frequency/ad9951.c | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/drivers/staging/iio/frequency/ad9951.c b/drivers/staging/iio/frequency/ad9951.c new file mode 100644 index 0000000..ba6f49f --- /dev/null +++ b/drivers/staging/iio/frequency/ad9951.c @@ -0,0 +1,232 @@ +/* + * Driver for ADI Direct Digital Synthesis ad9951 + * + * Copyright (c) 2010 Analog Devices Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ +#include <linux/types.h> +#include <linux/mutex.h> +#include <linux/device.h> +#include <linux/spi/spi.h> +#include <linux/slab.h> +#include <linux/sysfs.h> +#include <linux/module.h> + +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> + +#define DRV_NAME "ad9951" + +#define CFR1 0x0 +#define CFR2 0x1 + +#define AUTO_OSK (1) +#define OSKEN (1 << 1) +#define LOAD_ARR (1 << 2) + +#define AUTO_SYNC (1 << 7) + +#define LSB_FST (1) +#define SDIO_IPT (1 << 1) +#define CLR_PHA (1 << 2) +#define SINE_OPT (1 << 4) +#define ACLR_PHA (1 << 5) + +#define VCO_RANGE (1 << 2) + +#define CRS_OPT (1 << 1) +#define HMANU_SYNC (1 << 2) +#define HSPD_SYNC (1 << 3) + +/* Register format: 1 byte addr + value */ +struct ad9951_config { + u8 asf[3]; + u8 arr[2]; + u8 ftw0[5]; + u8 ftw1[3]; +}; + +struct ad9951_state { + struct mutex lock; + struct spi_device *sdev; +}; + +static ssize_t ad9951_set_parameter(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct spi_message msg; + struct spi_transfer xfer; + int ret; + struct ad9951_config *config = (struct ad9951_config *)buf; + struct iio_dev *idev = dev_to_iio_dev(dev); + struct ad9951_state *st = iio_priv(idev); + + xfer.len = 3; + xfer.tx_buf = &config->asf[0]; + mutex_lock(&st->lock); + + spi_message_init(&msg); + spi_message_add_tail(&xfer, &msg); + ret = spi_sync(st->sdev, &msg); + if (ret) + goto error_ret; + + xfer.len = 2; + xfer.tx_buf = &config->arr[0]; + + spi_message_init(&msg); + spi_message_add_tail(&xfer, &msg); + ret = spi_sync(st->sdev, &msg); + if (ret) + goto error_ret; + + xfer.len = 5; + xfer.tx_buf = &config->ftw0[0]; + + spi_message_init(&msg); + spi_message_add_tail(&xfer, &msg); + ret = spi_sync(st->sdev, &msg); + if (ret) + goto error_ret; + + xfer.len = 3; + xfer.tx_buf = &config->ftw1[0]; + + spi_message_init(&msg); + spi_message_add_tail(&xfer, &msg); + ret = spi_sync(st->sdev, &msg); + if (ret) + goto error_ret; +error_ret: + mutex_unlock(&st->lock); + + return ret ? ret : len; +} + +static IIO_DEVICE_ATTR(dds, S_IWUSR, NULL, ad9951_set_parameter, 0); + +static void ad9951_init(struct ad9951_state *st) +{ + struct spi_message msg; + struct spi_transfer xfer; + int ret; + u8 cfr[5]; + + cfr[0] = CFR1; + cfr[1] = 0; + cfr[2] = LSB_FST | CLR_PHA | SINE_OPT | ACLR_PHA; + cfr[3] = AUTO_OSK | OSKEN | LOAD_ARR; + cfr[4] = 0; + + mutex_lock(&st->lock); + + xfer.len = 5; + xfer.tx_buf = 𝔠 + + spi_message_init(&msg); + spi_message_add_tail(&xfer, &msg); + ret = spi_sync(st->sdev, &msg); + if (ret) + goto error_ret; + + cfr[0] = CFR2; + cfr[1] = VCO_RANGE; + cfr[2] = HSPD_SYNC; + cfr[3] = 0; + + xfer.len = 4; + xfer.tx_buf = 𝔠 + + spi_message_init(&msg); + spi_message_add_tail(&xfer, &msg); + ret = spi_sync(st->sdev, &msg); + if (ret) + goto error_ret; + +error_ret: + mutex_unlock(&st->lock); + + + +} + +static struct attribute *ad9951_attributes[] = { + &iio_dev_attr_dds.dev_attr.attr, + NULL, +}; + +static const struct attribute_group ad9951_attribute_group = { + .attrs = ad9951_attributes, +}; + +static const struct iio_info ad9951_info = { + .attrs = &ad9951_attribute_group, + .driver_module = THIS_MODULE, +}; + +static int __devinit ad9951_probe(struct spi_device *spi) +{ + struct ad9951_state *st; + struct iio_dev *idev; + int ret = 0; + + idev = iio_device_alloc(sizeof(*st)); + if (idev == NULL) { + ret = -ENOMEM; + goto error_ret; + } + spi_set_drvdata(spi, idev); + st = iio_priv(idev); + mutex_init(&st->lock); + st->sdev = spi; + + idev->dev.parent = &spi->dev; + + idev->info = &ad9951_info; + idev->modes = INDIO_DIRECT_MODE; + + ret = iio_device_register(idev); + if (ret) + goto error_free_dev; + spi->max_speed_hz = 2000000; + spi->mode = SPI_MODE_3; + spi->bits_per_word = 8; + spi_setup(spi); + ad9951_init(st); + return 0; + +error_free_dev: + iio_device_free(idev); + +error_ret: + return ret; +} + +static int __devexit ad9951_remove(struct spi_device *spi) +{ + iio_device_unregister(spi_get_drvdata(spi)); + iio_device_free(spi_get_drvdata(spi)); + + return 0; +} + +static struct spi_driver ad9951_driver = { + .driver = { + .name = DRV_NAME, + .owner = THIS_MODULE, + }, + .probe = ad9951_probe, + .remove = __devexit_p(ad9951_remove), +}; +module_spi_driver(ad9951_driver); + +MODULE_AUTHOR("Cliff Cai"); +MODULE_DESCRIPTION("Analog Devices ad9951 driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("spi:" DRV_NAME); |