diff options
author | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 12:17:53 -0700 |
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committer | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 15:44:42 -0700 |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/staging/iio/resolver/ad2s90.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/staging/iio/resolver/ad2s90.c')
-rw-r--r-- | kernel/drivers/staging/iio/resolver/ad2s90.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/kernel/drivers/staging/iio/resolver/ad2s90.c b/kernel/drivers/staging/iio/resolver/ad2s90.c new file mode 100644 index 000000000..e24c58906 --- /dev/null +++ b/kernel/drivers/staging/iio/resolver/ad2s90.c @@ -0,0 +1,120 @@ +/* + * ad2s90.c simple support for the ADI Resolver to Digital Converters: AD2S90 + * + * 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 <linux/module.h> + +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> + +struct ad2s90_state { + struct mutex lock; + struct spi_device *sdev; + u8 rx[2] ____cacheline_aligned; +}; + +static int ad2s90_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, + int *val2, + long m) +{ + int ret; + struct ad2s90_state *st = iio_priv(indio_dev); + + mutex_lock(&st->lock); + ret = spi_read(st->sdev, st->rx, 2); + if (ret) + goto error_ret; + *val = (((u16)(st->rx[0])) << 4) | ((st->rx[1] & 0xF0) >> 4); + +error_ret: + mutex_unlock(&st->lock); + + return IIO_VAL_INT; +} + +static const struct iio_info ad2s90_info = { + .read_raw = &ad2s90_read_raw, + .driver_module = THIS_MODULE, +}; + +static const struct iio_chan_spec ad2s90_chan = { + .type = IIO_ANGL, + .indexed = 1, + .channel = 0, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), +}; + +static int ad2s90_probe(struct spi_device *spi) +{ + struct iio_dev *indio_dev; + struct ad2s90_state *st; + int ret = 0; + + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); + if (!indio_dev) + return -ENOMEM; + st = iio_priv(indio_dev); + spi_set_drvdata(spi, indio_dev); + + mutex_init(&st->lock); + st->sdev = spi; + indio_dev->dev.parent = &spi->dev; + indio_dev->info = &ad2s90_info; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = &ad2s90_chan; + indio_dev->num_channels = 1; + indio_dev->name = spi_get_device_id(spi)->name; + + ret = iio_device_register(indio_dev); + if (ret) + return ret; + + /* need 600ns between CS and the first falling edge of SCLK */ + spi->max_speed_hz = 830000; + spi->mode = SPI_MODE_3; + spi_setup(spi); + + return 0; +} + +static int ad2s90_remove(struct spi_device *spi) +{ + iio_device_unregister(spi_get_drvdata(spi)); + + return 0; +} + +static const struct spi_device_id ad2s90_id[] = { + { "ad2s90" }, + {} +}; +MODULE_DEVICE_TABLE(spi, ad2s90_id); + +static struct spi_driver ad2s90_driver = { + .driver = { + .name = "ad2s90", + .owner = THIS_MODULE, + }, + .probe = ad2s90_probe, + .remove = ad2s90_remove, + .id_table = ad2s90_id, +}; +module_spi_driver(ad2s90_driver); + +MODULE_AUTHOR("Graff Yang <graff.yang@gmail.com>"); +MODULE_DESCRIPTION("Analog Devices AD2S90 Resolver to Digital SPI driver"); +MODULE_LICENSE("GPL v2"); |