--- /dev/null
+/*
+ * 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 iio_dev *idev;
+ 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 = idev->dev_data;
+
+ 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 int __devinit ad9951_probe(struct spi_device *spi)
+{
+ struct ad9951_state *st;
+ int ret = 0;
+
+ st = kzalloc(sizeof(*st), GFP_KERNEL);
+ if (st == NULL) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+ spi_set_drvdata(spi, st);
+
+ mutex_init(&st->lock);
+ st->sdev = spi;
+
+ st->idev = iio_allocate_device();
+ if (st->idev == NULL) {
+ ret = -ENOMEM;
+ goto error_free_st;
+ }
+ st->idev->dev.parent = &spi->dev;
+ st->idev->num_interrupt_lines = 0;
+ st->idev->event_attrs = NULL;
+
+ st->idev->attrs = &ad9951_attribute_group;
+ st->idev->dev_data = (void *)(st);
+ st->idev->driver_module = THIS_MODULE;
+ st->idev->modes = INDIO_DIRECT_MODE;
+
+ ret = iio_device_register(st->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(st->idev);
+error_free_st:
+ kfree(st);
+error_ret:
+ return ret;
+}
+
+static int __devexit ad9951_remove(struct spi_device *spi)
+{
+ struct ad9951_state *st = spi_get_drvdata(spi);
+
+ iio_device_unregister(st->idev);
+ kfree(st);
+
+ 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");
projects / mv-sheeva.git / blobdiff