staging:iio:resolver rename ad2s120x ->ad2s1200

There are far too many possible part numbers that are
not covered in here to have such a generic name.
So move to naming after one of the supported parts.

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Acked-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 187 insertions, 0 deletions

diff --git a/drivers/staging/iio/resolver/ad2s1200.c b/drivers/staging/iio/resolver/ad2s1200.c
new file mode 100644
index 000000000000..26268bfccffe
--- /dev/null
+++ b/drivers/staging/iio/resolver/ad2s1200.c
@@ -0,0 +1,187 @@
+/*
+ * ad2s1200.c simple support for the ADI Resolver to Digital Converters:
+ * AD2S1200/1205
+ *
+ * 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/delay.h>
+#include <linux/gpio.h>
+#include <linux/module.h>
+
+#include "../iio.h"
+#include "../sysfs.h"
+
+#define DRV_NAME "ad2s1200"
+
+/* input pin sample and rdvel is controlled by driver */
+#define AD2S1200_PN	2
+
+/* input clock on serial interface */
+#define AD2S1200_HZ	8192000
+/* clock period in nano second */
+#define AD2S1200_TSCLK	(1000000000/AD2S1200_HZ)
+
+struct ad2s1200_state {
+	struct mutex lock;
+	struct spi_device *sdev;
+	int sample;
+	int rdvel;
+	u8 rx[2] ____cacheline_aligned;
+};
+
+static int ad2s1200_read_raw(struct iio_dev *indio_dev,
+			   struct iio_chan_spec const *chan,
+			   int *val,
+			   int *val2,
+			   long m)
+{
+	int ret = 0;
+	s16 vel;
+	struct ad2s1200_state *st = iio_priv(indio_dev);
+
+	mutex_lock(&st->lock);
+	gpio_set_value(st->sample, 0);
+	/* delay (6 * AD2S1200_TSCLK + 20) nano seconds */
+	udelay(1);
+	gpio_set_value(st->sample, 1);
+	gpio_set_value(st->rdvel, !!(chan->type == IIO_ANGL));
+	ret = spi_read(st->sdev, st->rx, 2);
+	if (ret < 0) {
+		mutex_unlock(&st->lock);
+		return ret;
+	}
+
+	switch (chan->type) {
+	case IIO_ANGL:
+		*val = (((u16)(st->rx[0])) << 4) | ((st->rx[1] & 0xF0) >> 4);
+		break;
+	case IIO_ANGL_VEL:
+		vel = (((s16)(st->rx[0])) << 4) | ((st->rx[1] & 0xF0) >> 4);
+		vel = (vel << 4) >> 4;
+		*val = vel;
+	default:
+		mutex_unlock(&st->lock);
+		return -EINVAL;
+	}
+	/* delay (2 * AD2S1200_TSCLK + 20) ns for sample pulse */
+	udelay(1);
+	mutex_unlock(&st->lock);
+	return IIO_VAL_INT;
+}
+
+static const struct iio_chan_spec ad2s1200_channels[] = {
+	{
+		.type = IIO_ANGL,
+		.indexed = 1,
+		.channel = 0,
+	}, {
+		.type = IIO_ANGL_VEL,
+		.indexed = 1,
+		.channel = 0,
+	}
+};
+
+static const struct iio_info ad2s1200_info = {
+	.read_raw = &ad2s1200_read_raw,
+	.driver_module = THIS_MODULE,
+};
+
+static int __devinit ad2s1200_probe(struct spi_device *spi)
+{
+	struct ad2s1200_state *st;
+	struct iio_dev *indio_dev;
+	int pn, ret = 0;
+	unsigned short *pins = spi->dev.platform_data;
+
+	for (pn = 0; pn < AD2S1200_PN; pn++)
+		if (gpio_request_one(pins[pn], GPIOF_DIR_OUT, DRV_NAME)) {
+			pr_err("%s: request gpio pin %d failed\n",
+						DRV_NAME, pins[pn]);
+			goto error_ret;
+		}
+	indio_dev = iio_allocate_device(sizeof(*st));
+	if (indio_dev == NULL) {
+		ret = -ENOMEM;
+		goto error_ret;
+	}
+	spi_set_drvdata(spi, indio_dev);
+	st = iio_priv(indio_dev);
+	mutex_init(&st->lock);
+	st->sdev = spi;
+	st->sample = pins[0];
+	st->rdvel = pins[1];
+
+	indio_dev->dev.parent = &spi->dev;
+	indio_dev->info = &ad2s1200_info;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = ad2s1200_channels;
+	indio_dev->num_channels = ARRAY_SIZE(ad2s1200_channels);
+	indio_dev->name = spi_get_device_id(spi)->name;
+
+	ret = iio_device_register(indio_dev);
+	if (ret)
+		goto error_free_dev;
+
+	spi->max_speed_hz = AD2S1200_HZ;
+	spi->mode = SPI_MODE_3;
+	spi_setup(spi);
+
+	return 0;
+
+error_free_dev:
+	iio_free_device(indio_dev);
+error_ret:
+	for (--pn; pn >= 0; pn--)
+		gpio_free(pins[pn]);
+	return ret;
+}
+
+static int __devexit ad2s1200_remove(struct spi_device *spi)
+{
+	iio_device_unregister(spi_get_drvdata(spi));
+
+	return 0;
+}
+
+static const struct spi_device_id ad2s1200_id[] = {
+	{ "ad2s1200" },
+	{ "ad2s1205" },
+	{}
+};
+
+static struct spi_driver ad2s1200_driver = {
+	.driver = {
+		.name = DRV_NAME,
+		.owner = THIS_MODULE,
+	},
+	.probe = ad2s1200_probe,
+	.remove = __devexit_p(ad2s1200_remove),
+	.id_table = ad2s1200_id,
+};
+
+static __init int ad2s1200_spi_init(void)
+{
+	return spi_register_driver(&ad2s1200_driver);
+}
+module_init(ad2s1200_spi_init);
+
+static __exit void ad2s1200_spi_exit(void)
+{
+	spi_unregister_driver(&ad2s1200_driver);
+}
+module_exit(ad2s1200_spi_exit);
+
+MODULE_AUTHOR("Graff Yang <graff.yang@gmail.com>");
+MODULE_DESCRIPTION("Analog Devices AD2S1200/1205 Resolver to Digital SPI driver");
+MODULE_LICENSE("GPL v2");