| /* |
| * 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_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); |
| |
| ret = spi_sync_transfer(st->sdev, &xfer, 1); |
| if (ret) |
| goto error_ret; |
| |
| xfer.len = 3; |
| xfer.tx_buf = &config->phajst1[0]; |
| |
| ret = spi_sync_transfer(st->sdev, &xfer, 1); |
| if (ret) |
| goto error_ret; |
| |
| xfer.len = 6; |
| xfer.tx_buf = &config->fretun1[0]; |
| |
| ret = spi_sync_transfer(st->sdev, &xfer, 1); |
| if (ret) |
| goto error_ret; |
| |
| xfer.len = 6; |
| xfer.tx_buf = &config->fretun2[0]; |
| |
| ret = spi_sync_transfer(st->sdev, &xfer, 1); |
| if (ret) |
| goto error_ret; |
| |
| xfer.len = 6; |
| xfer.tx_buf = &config->dltafre[0]; |
| |
| ret = spi_sync_transfer(st->sdev, &xfer, 1); |
| if (ret) |
| goto error_ret; |
| |
| xfer.len = 5; |
| xfer.tx_buf = &config->updtclk[0]; |
| |
| ret = spi_sync_transfer(st->sdev, &xfer, 1); |
| if (ret) |
| goto error_ret; |
| |
| xfer.len = 4; |
| xfer.tx_buf = &config->ramprat[0]; |
| |
| ret = spi_sync_transfer(st->sdev, &xfer, 1); |
| if (ret) |
| goto error_ret; |
| |
| xfer.len = 5; |
| xfer.tx_buf = &config->control[0]; |
| |
| ret = spi_sync_transfer(st->sdev, &xfer, 1); |
| if (ret) |
| goto error_ret; |
| |
| xfer.len = 3; |
| xfer.tx_buf = &config->outpskm[0]; |
| |
| ret = spi_sync_transfer(st->sdev, &xfer, 1); |
| if (ret) |
| goto error_ret; |
| |
| xfer.len = 2; |
| xfer.tx_buf = &config->outpskr[0]; |
| |
| ret = spi_sync_transfer(st->sdev, &xfer, 1); |
| if (ret) |
| goto error_ret; |
| |
| xfer.len = 3; |
| xfer.tx_buf = &config->daccntl[0]; |
| |
| ret = spi_sync_transfer(st->sdev, &xfer, 1); |
| 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_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; |
| |
| ret = spi_sync_transfer(st->sdev, &xfer, 1); |
| 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 ad9852_probe(struct spi_device *spi) |
| { |
| struct ad9852_state *st; |
| struct iio_dev *idev; |
| int ret = 0; |
| |
| idev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); |
| if (!idev) |
| return -ENOMEM; |
| 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) |
| return ret; |
| spi->max_speed_hz = 2000000; |
| spi->mode = SPI_MODE_3; |
| spi->bits_per_word = 8; |
| spi_setup(spi); |
| ad9852_init(st); |
| |
| return 0; |
| } |
| |
| static int ad9852_remove(struct spi_device *spi) |
| { |
| iio_device_unregister(spi_get_drvdata(spi)); |
| |
| return 0; |
| } |
| |
| static struct spi_driver ad9852_driver = { |
| .driver = { |
| .name = DRV_NAME, |
| .owner = THIS_MODULE, |
| }, |
| .probe = ad9852_probe, |
| .remove = 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); |