/drivers/staging/iio/dds/ad9951.c
https://bitbucket.org/cyanogenmod/android_kernel_asus_tf300t · C · 241 lines · 181 code · 49 blank · 11 comment · 9 complexity · 9983eb70a7cb395d5b3af5449b3e8c55 MD5 · raw file
- /*
- * 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 "../iio.h"
- #include "../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_get_drvdata(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 = {
- .name = DRV_NAME,
- .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_allocate_device(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_free_device(idev);
- error_ret:
- return ret;
- }
- static int __devexit ad9951_remove(struct spi_device *spi)
- {
- iio_device_unregister(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),
- };
- static __init int ad9951_spi_init(void)
- {
- return spi_register_driver(&ad9951_driver);
- }
- module_init(ad9951_spi_init);
- static __exit void ad9951_spi_exit(void)
- {
- spi_unregister_driver(&ad9951_driver);
- }
- module_exit(ad9951_spi_exit);
- MODULE_AUTHOR("Cliff Cai");
- MODULE_DESCRIPTION("Analog Devices ad9951 driver");
- MODULE_LICENSE("GPL v2");