diff options
Diffstat (limited to 'drivers/staging/iio/frequency/ad9852.c')
| -rw-r--r-- | drivers/staging/iio/frequency/ad9852.c | 288 |
1 files changed, 288 insertions, 0 deletions
diff --git a/drivers/staging/iio/frequency/ad9852.c b/drivers/staging/iio/frequency/ad9852.c new file mode 100644 index 000000000000..fd9d14a413a5 --- /dev/null +++ b/drivers/staging/iio/frequency/ad9852.c @@ -0,0 +1,288 @@ +/* + * Driver for ADI Direct Digital Synthesis ad9852 + * + * 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 "ad9852" + +#define addr_phaad1 0x0 +#define addr_phaad2 0x1 +#define addr_fretu1 0x2 +#define addr_fretu2 0x3 +#define addr_delfre 0x4 +#define addr_updclk 0x5 +#define addr_ramclk 0x6 +#define addr_contrl 0x7 +#define addr_optskm 0x8 +#define addr_optskr 0xa +#define addr_dacctl 0xb + +#define COMPPD (1 << 4) +#define REFMULT2 (1 << 2) +#define BYPPLL (1 << 5) +#define PLLRANG (1 << 6) +#define IEUPCLK (1) +#define OSKEN (1 << 5) + +#define read_bit (1 << 7) + +/* Register format: 1 byte addr + value */ +struct ad9852_config { + u8 phajst0[3]; + u8 phajst1[3]; + u8 fretun1[6]; + u8 fretun2[6]; + u8 dltafre[6]; + u8 updtclk[5]; + u8 ramprat[4]; + u8 control[5]; + u8 outpskm[3]; + u8 outpskr[2]; + u8 daccntl[3]; +}; + +struct ad9852_state { + struct mutex lock; + struct spi_device *sdev; +}; + +static ssize_t ad9852_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 ad9852_config *config = (struct ad9852_config *)buf; + struct iio_dev *idev = dev_to_iio_dev(dev); + struct ad9852_state *st = iio_priv(idev); + + xfer.len = 3; + xfer.tx_buf = &config->phajst0[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 = 3; + xfer.tx_buf = &config->phajst1[0]; + + spi_message_init(&msg); + spi_message_add_tail(&xfer, &msg); + ret = spi_sync(st->sdev, &msg); + if (ret) + goto error_ret; + + xfer.len = 6; + xfer.tx_buf = &config->fretun1[0]; + + spi_message_init(&msg); + spi_message_add_tail(&xfer, &msg); + ret = spi_sync(st->sdev, &msg); + if (ret) + goto error_ret; + + xfer.len = 6; + xfer.tx_buf = &config->fretun2[0]; + + spi_message_init(&msg); + spi_message_add_tail(&xfer, &msg); + ret = spi_sync(st->sdev, &msg); + if (ret) + goto error_ret; + + xfer.len = 6; + xfer.tx_buf = &config->dltafre[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->updtclk[0]; + + spi_message_init(&msg); + spi_message_add_tail(&xfer, &msg); + ret = spi_sync(st->sdev, &msg); + if (ret) + goto error_ret; + + xfer.len = 4; + xfer.tx_buf = &config->ramprat[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->control[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->outpskm[0]; + + 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->outpskr[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->daccntl[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, ad9852_set_parameter, 0); + +static void ad9852_init(struct ad9852_state *st) +{ + struct spi_message msg; + struct spi_transfer xfer; + int ret; + u8 config[5]; + + config[0] = addr_contrl; + config[1] = COMPPD; + config[2] = REFMULT2 | BYPPLL | PLLRANG; + config[3] = IEUPCLK; + config[4] = OSKEN; + + mutex_lock(&st->lock); + + xfer.len = 5; + xfer.tx_buf = &config; + + 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 *ad9852_attributes[] = { + &iio_dev_attr_dds.dev_attr.attr, + NULL, +}; + +static const struct attribute_group ad9852_attribute_group = { + .attrs = ad9852_attributes, +}; + +static const struct iio_info ad9852_info = { + .attrs = &ad9852_attribute_group, + .driver_module = THIS_MODULE, +}; + +static int __devinit ad9852_probe(struct spi_device *spi) +{ + struct ad9852_state *st; + struct iio_dev *idev; + int ret = 0; + + idev = iio_device_alloc(sizeof(*st)); + if (idev == NULL) { + ret = -ENOMEM; + goto error_ret; + } + st = iio_priv(idev); + spi_set_drvdata(spi, idev); + mutex_init(&st->lock); + st->sdev = spi; + + idev->dev.parent = &spi->dev; + idev->info = &ad9852_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); + ad9852_init(st); + + return 0; + +error_free_dev: + iio_device_free(idev); + +error_ret: + return ret; +} + +static int __devexit ad9852_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 ad9852_driver = { + .driver = { + .name = DRV_NAME, + .owner = THIS_MODULE, + }, + .probe = ad9852_probe, + .remove = __devexit_p(ad9852_remove), +}; +module_spi_driver(ad9852_driver); + +MODULE_AUTHOR("Cliff Cai"); +MODULE_DESCRIPTION("Analog Devices ad9852 driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("spi:" DRV_NAME); |