From: Cliff Cai <cliff.cai@xxxxxxxxxx> Signed-off-by: Cliff Cai <cliff.cai@xxxxxxxxxx> Signed-off-by: Mike Frysinger <vapier@xxxxxxxxxx> --- drivers/staging/iio/dds/Kconfig | 7 + drivers/staging/iio/dds/Makefile | 1 + drivers/staging/iio/dds/ad9832.c | 265 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 273 insertions(+), 0 deletions(-) create mode 100644 drivers/staging/iio/dds/ad9832.c diff --git a/drivers/staging/iio/dds/Kconfig b/drivers/staging/iio/dds/Kconfig index d32bebc..c9fae1d 100644 --- a/drivers/staging/iio/dds/Kconfig +++ b/drivers/staging/iio/dds/Kconfig @@ -9,3 +9,10 @@ config AD5930 help Say yes here to build support for Analog Devices DDS chip ad5930/ad5932, provides direct access via sysfs. + +config AD9832 + tristate "Analog Devices ad9832/3/4/5 driver" + depends on SPI + help + Say yes here to build support for Analog Devices DDS chip + ad9832/3/4/5, provides direct access via sysfs. diff --git a/drivers/staging/iio/dds/Makefile b/drivers/staging/iio/dds/Makefile index 110f289..d0f17f0 100644 --- a/drivers/staging/iio/dds/Makefile +++ b/drivers/staging/iio/dds/Makefile @@ -3,3 +3,4 @@ # obj-$(CONFIG_AD5930) += ad5930.o +obj-$(CONFIG_AD9832) += ad9832.o diff --git a/drivers/staging/iio/dds/ad9832.c b/drivers/staging/iio/dds/ad9832.c new file mode 100644 index 0000000..f276cea --- /dev/null +++ b/drivers/staging/iio/dds/ad9832.c @@ -0,0 +1,265 @@ +/* + * Driver for ADI Direct Digital Synthesis ad9832 + * + * 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 "ad9832" + +#define value_mask (u16)0xf000 +#define cmd_shift 12 +#define add_shift 8 +#define SYNC (1 << 13) +#define SELSRC (1 << 12) +#define SLEEP (1 << 13) +#define RESET (1 << 12) +#define CLR (1 << 11) + +#define ADD_FREQ0LL 0x0 +#define ADD_FREQ0HL 0x1 +#define ADD_FREQ0LM 0x2 +#define ADD_FREQ0HM 0x3 +#define ADD_FREQ1LL 0x4 +#define ADD_FREQ1HL 0x5 +#define ADD_FREQ1LM 0x6 +#define ADD_FREQ1HM 0x7 +#define ADD_PHASE0L 0x8 +#define ADD_PHASE0H 0x9 +#define ADD_PHASE1L 0xa +#define ADD_PHASE1H 0xb +#define ADD_PHASE2L 0xc +#define ADD_PHASE2H 0xd +#define ADD_PHASE3L 0xe +#define ADD_PHASE3H 0xf + +#define CMD_PHA8BITSW 0x1 +#define CMD_PHA16BITSW 0x0 +#define CMD_FRE8BITSW 0x3 +#define CMD_FRE16BITSW 0x2 +#define CMD_SELBITSCTL 0x6 + +struct ad9832_setting { + u16 freq0[4]; + u16 freq1[4]; + u16 phase0[2]; + u16 phase1[2]; + u16 phase2[2]; + u16 phase3[2]; +}; + +struct ad9832_state { + struct mutex lock; + struct iio_dev *idev; + struct spi_device *sdev; +}; + +static ssize_t ad9832_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 ad9832_setting config; + struct iio_dev *idev = dev_get_drvdata(dev); + struct ad9832_state *st = idev->dev_data; + + config.freq0[0] = (CMD_FRE8BITSW << add_shift | ADD_FREQ0LL << add_shift | buf[0]); + config.freq0[1] = (CMD_FRE16BITSW << add_shift | ADD_FREQ0HL << add_shift | buf[1]); + config.freq0[2] = (CMD_FRE8BITSW << add_shift | ADD_FREQ0LM << add_shift | buf[2]); + config.freq0[3] = (CMD_FRE16BITSW << add_shift | ADD_FREQ0HM << add_shift | buf[3]); + config.freq1[0] = (CMD_FRE8BITSW << add_shift | ADD_FREQ1LL << add_shift | buf[4]); + config.freq1[1] = (CMD_FRE16BITSW << add_shift | ADD_FREQ1HL << add_shift | buf[5]); + config.freq1[2] = (CMD_FRE8BITSW << add_shift | ADD_FREQ1LM << add_shift | buf[6]); + config.freq1[3] = (CMD_FRE16BITSW << add_shift | ADD_FREQ1HM << add_shift | buf[7]); + + config.phase0[0] = (CMD_PHA8BITSW << add_shift | ADD_PHASE0L << add_shift | buf[9]); + config.phase0[1] = (CMD_PHA16BITSW << add_shift | ADD_PHASE0H << add_shift | buf[10]); + config.phase1[0] = (CMD_PHA8BITSW << add_shift | ADD_PHASE1L << add_shift | buf[11]); + config.phase1[1] = (CMD_PHA16BITSW << add_shift | ADD_PHASE1H << add_shift | buf[12]); + config.phase2[0] = (CMD_PHA8BITSW << add_shift | ADD_PHASE2L << add_shift | buf[13]); + config.phase2[1] = (CMD_PHA16BITSW << add_shift | ADD_PHASE2H << add_shift | buf[14]); + config.phase3[0] = (CMD_PHA8BITSW << add_shift | ADD_PHASE3L << add_shift | buf[15]); + config.phase3[1] = (CMD_PHA16BITSW << add_shift | ADD_PHASE3H << add_shift | buf[16]); + + xfer.len = 2 * 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, ad9832_set_parameter, 0); + +static struct attribute *ad9832_attributes[] = { + &iio_dev_attr_dds.dev_attr.attr, + NULL, +}; + +static const struct attribute_group ad9832_attribute_group = { + .name = DRV_NAME, + .attrs = ad9832_attributes, +}; + +static void ad9832_init(struct ad9832_state *st) +{ + struct spi_message msg; + struct spi_transfer xfer; + int ret; + u16 config = 0; + + config = 0x3 << 14 | SLEEP | RESET | CLR; + + mutex_lock(&st->lock); + + xfer.len = 2; + 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; + + config = 0x2 << 14 | SYNC | SELSRC; + xfer.len = 2; + 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; + + config = CMD_SELBITSCTL << cmd_shift; + xfer.len = 2; + 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; + + config = 0x3 << 14; + + mutex_lock(&st->lock); + + xfer.len = 2; + 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 int __devinit ad9832_probe(struct spi_device *spi) +{ + struct ad9832_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 = &ad9832_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); + ad9832_init(st); + return 0; + +error_free_dev: + iio_free_device(st->idev); +error_free_st: + kfree(st); +error_ret: + return ret; +} + +static int __devexit ad9832_remove(struct spi_device *spi) +{ + struct ad9832_state *st = spi_get_drvdata(spi); + + iio_device_unregister(st->idev); + kfree(st); + + return 0; +} + +static struct spi_driver ad9832_driver = { + .driver = { + .name = DRV_NAME, + .owner = THIS_MODULE, + }, + .probe = ad9832_probe, + .remove = __devexit_p(ad9832_remove), +}; + +static __init int ad9832_spi_init(void) +{ + return spi_register_driver(&ad9832_driver); +} +module_init(ad9832_spi_init); + +static __exit void ad9832_spi_exit(void) +{ + spi_unregister_driver(&ad9832_driver); +} +module_exit(ad9832_spi_exit); + +MODULE_AUTHOR("Cliff Cai"); +MODULE_DESCRIPTION("Analog Devices ad9832 driver"); -- 1.7.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html