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author | Cliff Cai <cliff.cai@analog.com> | 2010-10-28 01:44:10 (GMT) |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-11-09 23:46:41 (GMT) |
commit | a82ab27aa758e4b02f130d86be5c2fedf29c0c0a (patch) | |
tree | 1e499da6ed32e402e16fb1f90e1cd5f93ce2b65c /drivers/staging/iio/dds | |
parent | 4a8e6c33e88b09a3fdef022d1711dc13ce8cb7db (diff) | |
download | linux-fsl-qoriq-a82ab27aa758e4b02f130d86be5c2fedf29c0c0a.tar.xz |
staging: iio: dds: new driver for AD9850/1 devices
Signed-off-by: Cliff Cai <cliff.cai@analog.com>
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/staging/iio/dds')
-rw-r--r-- | drivers/staging/iio/dds/Kconfig | 7 | ||||
-rw-r--r-- | drivers/staging/iio/dds/Makefile | 1 | ||||
-rw-r--r-- | drivers/staging/iio/dds/ad9850.c | 156 |
3 files changed, 164 insertions, 0 deletions
diff --git a/drivers/staging/iio/dds/Kconfig b/drivers/staging/iio/dds/Kconfig index c9fae1d..d42bc4c 100644 --- a/drivers/staging/iio/dds/Kconfig +++ b/drivers/staging/iio/dds/Kconfig @@ -16,3 +16,10 @@ config AD9832 help Say yes here to build support for Analog Devices DDS chip ad9832/3/4/5, provides direct access via sysfs. + +config AD9850 + tristate "Analog Devices ad9850/1 driver" + depends on SPI + help + Say yes here to build support for Analog Devices DDS chip + ad9850/1, provides direct access via sysfs. diff --git a/drivers/staging/iio/dds/Makefile b/drivers/staging/iio/dds/Makefile index d0f17f0..791db74 100644 --- a/drivers/staging/iio/dds/Makefile +++ b/drivers/staging/iio/dds/Makefile @@ -4,3 +4,4 @@ obj-$(CONFIG_AD5930) += ad5930.o obj-$(CONFIG_AD9832) += ad9832.o +obj-$(CONFIG_AD9850) += ad9850.o diff --git a/drivers/staging/iio/dds/ad9850.c b/drivers/staging/iio/dds/ad9850.c new file mode 100644 index 0000000..b259bfe --- /dev/null +++ b/drivers/staging/iio/dds/ad9850.c @@ -0,0 +1,156 @@ +/* + * Driver for ADI Direct Digital Synthesis ad9850 + * + * Copyright (c) 2010-2010 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 "ad9850" + +#define value_mask (u16)0xf000 +#define addr_shift 12 + +/* Register format: 4 bits addr + 12 bits value */ +struct ad9850_config { + u8 control[5]; +}; + +struct ad9850_state { + struct mutex lock; + struct iio_dev *idev; + struct spi_device *sdev; +}; + +static ssize_t ad9850_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 ad9850_config *config = (struct ad9850_config *)buf; + struct iio_dev *idev = dev_get_drvdata(dev); + struct ad9850_state *st = idev->dev_data; + + xfer.len = len; + xfer.tx_buf = config; + 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; +error_ret: + mutex_unlock(&st->lock); + + return ret ? ret : len; +} + +static IIO_DEVICE_ATTR(dds, S_IWUSR, NULL, ad9850_set_parameter, 0); + +static struct attribute *ad9850_attributes[] = { + &iio_dev_attr_dds.dev_attr.attr, + NULL, +}; + +static const struct attribute_group ad9850_attribute_group = { + .name = DRV_NAME, + .attrs = ad9850_attributes, +}; + +static int __devinit ad9850_probe(struct spi_device *spi) +{ + struct ad9850_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 = &ad9850_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 = 16; + spi_setup(spi); + + return 0; + +error_free_dev: + iio_free_device(st->idev); +error_free_st: + kfree(st); +error_ret: + return ret; +} + +static int __devexit ad9850_remove(struct spi_device *spi) +{ + struct ad9850_state *st = spi_get_drvdata(spi); + + iio_device_unregister(st->idev); + kfree(st); + + return 0; +} + +static struct spi_driver ad9850_driver = { + .driver = { + .name = DRV_NAME, + .owner = THIS_MODULE, + }, + .probe = ad9850_probe, + .remove = __devexit_p(ad9850_remove), +}; + +static __init int ad9850_spi_init(void) +{ + return spi_register_driver(&ad9850_driver); +} +module_init(ad9850_spi_init); + +static __exit void ad9850_spi_exit(void) +{ + spi_unregister_driver(&ad9850_driver); +} +module_exit(ad9850_spi_exit); + +MODULE_AUTHOR("Cliff Cai"); +MODULE_DESCRIPTION("Analog Devices ad9850 driver"); +MODULE_LICENSE("GPL v2"); |