X-Git-Url: https://git.karo-electronics.de/?p=mv-sheeva.git;a=blobdiff_plain;f=drivers%2Fstaging%2Fiio%2Fdds%2Fad9951.c;fp=drivers%2Fstaging%2Fiio%2Fdds%2Fad9951.c;h=57eddf6d47137fe720b3cec4898e95a0279a0578;hp=0000000000000000000000000000000000000000;hb=92d62d098f574ed70b26548e6a2e2f67025864dc;hpb=690c12d2c8ca50e55a3f507059c780ecdb8fd83f diff --git a/drivers/staging/iio/dds/ad9951.c b/drivers/staging/iio/dds/ad9951.c new file mode 100644 index 00000000000..57eddf6d471 --- /dev/null +++ b/drivers/staging/iio/dds/ad9951.c @@ -0,0 +1,249 @@ +/* + * 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 +#include +#include +#include +#include +#include + +#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");