diff options
Diffstat (limited to 'drivers/staging/iio/resolver/ad2s120x.c')
| -rw-r--r-- | drivers/staging/iio/resolver/ad2s120x.c | 177 |
1 files changed, 0 insertions, 177 deletions
diff --git a/drivers/staging/iio/resolver/ad2s120x.c b/drivers/staging/iio/resolver/ad2s120x.c deleted file mode 100644 index bed4c72..0000000 --- a/drivers/staging/iio/resolver/ad2s120x.c +++ /dev/null @@ -1,177 +0,0 @@ -/* - * 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 "../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 ssize_t ad2s120x_show_val(struct device *dev, - struct device_attribute *attr, char *buf) -{ - int ret = 0; - ssize_t len = 0; - u16 pos; - s16 vel; - u8 status; - struct ad2s120x_state *st = iio_priv(dev_get_drvdata(dev)); - struct iio_dev_attr *iattr = to_iio_dev_attr(attr); - - 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, iattr->address); - ret = spi_read(st->sdev, st->rx, 2); - if (ret < 0) - goto error_ret; - status = st->rx[1]; - if (iattr->address) - pos = (((u16)(st->rx[0])) << 4) | ((st->rx[1] & 0xF0) >> 4); - else { - vel = (st->rx[0] & 0x80) ? 0xf000 : 0; - vel |= (((s16)(st->rx[0])) << 4) | ((st->rx[1] & 0xF0) >> 4); - } - len = sprintf(buf, "%d %c%c%c%c ", iattr->address ? pos : vel, - (status & 0x8) ? 'P' : 'V', - (status & 0x4) ? 'd' : '_', - (status & 0x2) ? 'l' : '_', - (status & 0x1) ? '1' : '0'); -error_ret: - /* delay (2 * AD2S120X_TSCLK + 20) ns for sample pulse */ - udelay(1); - mutex_unlock(&st->lock); - - return ret ? ret : len; -} - -static IIO_DEVICE_ATTR(pos, S_IRUGO, ad2s120x_show_val, NULL, 1); -static IIO_DEVICE_ATTR(vel, S_IRUGO, ad2s120x_show_val, NULL, 0); - -static struct attribute *ad2s120x_attributes[] = { - &iio_dev_attr_pos.dev_attr.attr, - &iio_dev_attr_vel.dev_attr.attr, - NULL, -}; - -static const struct attribute_group ad2s120x_attribute_group = { - .attrs = ad2s120x_attributes, -}; - -static const struct iio_info ad2s120x_info = { - .attrs = &ad2s120x_attribute_group, - .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; - - 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"); |
