Say yes here to build support for Analog Devices spi resolver
to digital converters, ad2s90, provides direct access via sysfs.
-config AD2S120X
- tristate "Analog Devices ad2s120x driver"
+config AD2S1200
+ tristate "Analog Devices ad2s1200/ad2s1205 driver"
depends on SPI
help
Say yes here to build support for Analog Devices spi resolver
#
obj-$(CONFIG_AD2S90) += ad2s90.o
-obj-$(CONFIG_AD2S120X) += ad2s120x.o
+obj-$(CONFIG_AD2S1200) += ad2s1200.o
obj-$(CONFIG_AD2S1210) += ad2s1210.o
--- /dev/null
+/*
+ * 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");
+++ /dev/null
-/*
- * ad2s120x.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 "ad2s120x"
-
-/* input pin sample and rdvel is controlled by driver */
-#define AD2S120X_PN 2
-
-/* input clock on serial interface */
-#define AD2S120X_HZ 8192000
-/* clock period in nano second */
-#define AD2S120X_TSCLK (1000000000/AD2S120X_HZ)
-
-struct ad2s120x_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 ad2s120x_state *st = iio_priv(indio_dev);
-
- mutex_lock(&st->lock);
- gpio_set_value(st->sample, 0);
- /* delay (6 * AD2S120X_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 * AD2S120X_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 ad2s120x_info = {
- .read_raw = &ad2s1200_read_raw,
- .driver_module = THIS_MODULE,
-};
-
-static int __devinit ad2s120x_probe(struct spi_device *spi)
-{
- struct ad2s120x_state *st;
- struct iio_dev *indio_dev;
- int pn, ret = 0;
- unsigned short *pins = spi->dev.platform_data;
-
- for (pn = 0; pn < AD2S120X_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 = &ad2s120x_info;
- indio_dev->modes = INDIO_DIRECT_MODE;
- indio_dev->channels = ad2s1200_channels;
- indio_dev->num_channels = ARRAY_SIZE(ad2s1200_channels);
-
- ret = iio_device_register(indio_dev);
- if (ret)
- goto error_free_dev;
-
- spi->max_speed_hz = AD2S120X_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 ad2s120x_remove(struct spi_device *spi)
-{
- iio_device_unregister(spi_get_drvdata(spi));
-
- return 0;
-}
-
-static struct spi_driver ad2s120x_driver = {
- .driver = {
- .name = DRV_NAME,
- .owner = THIS_MODULE,
- },
- .probe = ad2s120x_probe,
- .remove = __devexit_p(ad2s120x_remove),
-};
-
-static __init int ad2s120x_spi_init(void)
-{
- return spi_register_driver(&ad2s120x_driver);
-}
-module_init(ad2s120x_spi_init);
-
-static __exit void ad2s120x_spi_exit(void)
-{
- spi_unregister_driver(&ad2s120x_driver);
-}
-module_exit(ad2s120x_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");
projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / commitdiff