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path: root/drivers/staging/iio/resolver/ad2s120x.c
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Diffstat (limited to 'drivers/staging/iio/resolver/ad2s120x.c')
-rw-r--r--drivers/staging/iio/resolver/ad2s120x.c196
1 files changed, 31 insertions, 165 deletions
diff --git a/drivers/staging/iio/resolver/ad2s120x.c b/drivers/staging/iio/resolver/ad2s120x.c
index f83e1422fd29..bed4c725f2df 100644
--- a/drivers/staging/iio/resolver/ad2s120x.c
+++ b/drivers/staging/iio/resolver/ad2s120x.c
@@ -32,161 +32,46 @@
struct ad2s120x_state {
struct mutex lock;
- struct iio_dev *idev;
struct spi_device *sdev;
- unsigned short sample;
- unsigned short rdvel;
- u8 rx[2];
- u8 tx[2];
+ int sample;
+ int rdvel;
+ u8 rx[2] ____cacheline_aligned;
};
-static ssize_t ad2s120x_show_pos_vel(struct device *dev,
+static ssize_t ad2s120x_show_val(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct spi_message msg;
- struct spi_transfer xfer;
int ret = 0;
ssize_t len = 0;
u16 pos;
s16 vel;
u8 status;
- struct iio_dev *idev = dev_get_drvdata(dev);
- struct ad2s120x_state *st = idev->dev_data;
+ struct ad2s120x_state *st = iio_priv(dev_get_drvdata(dev));
+ struct iio_dev_attr *iattr = to_iio_dev_attr(attr);
- xfer.len = 1;
- xfer.tx_buf = st->tx;
- xfer.rx_buf = st->rx;
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);
-
- spi_message_init(&msg);
- spi_message_add_tail(&xfer, &msg);
- ret = spi_sync(st->sdev, &msg);
- if (ret)
- goto error_ret;
- status = st->rx[1];
- pos = (((u16)(st->rx[0])) << 4) | ((st->rx[1] & 0xF0) >> 4);
- len = sprintf(buf, "%d %c%c%c%c ", pos,
- (status & 0x8) ? 'P' : 'V',
- (status & 0x4) ? 'd' : '_',
- (status & 0x2) ? 'l' : '_',
- (status & 0x1) ? '1' : '0');
-
- /* delay 18 ns */
- /* ndelay(18); */
-
- gpio_set_value(st->rdvel, 0);
- /* ndelay(5);*/
-
- spi_message_init(&msg);
- spi_message_add_tail(&xfer, &msg);
- ret = spi_sync(st->sdev, &msg);
- if (ret)
+ 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];
- vel = (st->rx[0] & 0x80) ? 0xf000 : 0;
- vel |= (((s16)(st->rx[0])) << 4) | ((st->rx[1] & 0xF0) >> 4);
- len += sprintf(buf + len, "%d %c%c%c%c\n", vel,
- (status & 0x8) ? 'P' : 'V',
- (status & 0x4) ? 'd' : '_',
- (status & 0x2) ? 'l' : '_',
- (status & 0x1) ? '1' : '0');
-error_ret:
- gpio_set_value(st->rdvel, 1);
- /* delay (2 * AD2S120X_TSCLK + 20) ns for sample pulse */
- udelay(1);
- mutex_unlock(&st->lock);
-
- return ret ? ret : len;
-}
-
-static ssize_t ad2s120x_show_pos(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct spi_message msg;
- struct spi_transfer xfer;
- int ret = 0;
- ssize_t len = 0;
- u16 pos;
- u8 status;
- struct iio_dev *idev = dev_get_drvdata(dev);
- struct ad2s120x_state *st = idev->dev_data;
-
- xfer.len = 1;
- xfer.tx_buf = st->tx;
- xfer.rx_buf = st->rx;
- 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, 1);
-
- spi_message_init(&msg);
- spi_message_add_tail(&xfer, &msg);
- ret = spi_sync(st->sdev, &msg);
- if (ret)
- goto error_ret;
- status = st->rx[1];
- pos = (((u16)(st->rx[0])) << 4) | ((st->rx[1] & 0xF0) >> 4);
- len = sprintf(buf, "%d %c%c%c%c ", pos,
- (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 ssize_t ad2s120x_show_vel(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct spi_message msg;
- struct spi_transfer xfer;
- int ret = 0;
- ssize_t len = 0;
- s16 vel;
- u8 status;
- struct iio_dev *idev = dev_get_drvdata(dev);
- struct ad2s120x_state *st = idev->dev_data;
-
- xfer.len = 1;
- xfer.tx_buf = st->tx;
- xfer.rx_buf = st->rx;
- 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, 0);
- /* ndelay(5);*/
-
- spi_message_init(&msg);
- spi_message_add_tail(&xfer, &msg);
- ret = spi_sync(st->sdev, &msg);
- if (ret)
- goto error_ret;
- status = st->rx[1];
- vel = (st->rx[0] & 0x80) ? 0xf000 : 0;
- vel |= (((s16)(st->rx[0])) << 4) | ((st->rx[1] & 0xF0) >> 4);
- len += sprintf(buf + len, "%d %c%c%c%c\n", vel,
+ 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:
- gpio_set_value(st->rdvel, 1);
/* delay (2 * AD2S120X_TSCLK + 20) ns for sample pulse */
udelay(1);
mutex_unlock(&st->lock);
@@ -194,15 +79,10 @@ error_ret:
return ret ? ret : len;
}
-static IIO_CONST_ATTR(description,
- "12-Bit R/D Converter with Reference Oscillator");
-static IIO_DEVICE_ATTR(pos_vel, S_IRUGO, ad2s120x_show_pos_vel, NULL, 0);
-static IIO_DEVICE_ATTR(pos, S_IRUGO, ad2s120x_show_pos, NULL, 0);
-static IIO_DEVICE_ATTR(vel, S_IRUGO, ad2s120x_show_vel, NULL, 0);
+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_const_attr_description.dev_attr.attr,
- &iio_dev_attr_pos_vel.dev_attr.attr,
&iio_dev_attr_pos.dev_attr.attr,
&iio_dev_attr_vel.dev_attr.attr,
NULL,
@@ -220,42 +100,33 @@ static const struct iio_info ad2s120x_info = {
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(pins[pn], DRV_NAME)) {
+ 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;
}
- gpio_direction_output(pins[pn], 1);
- }
-
- st = kzalloc(sizeof(*st), GFP_KERNEL);
- if (st == NULL) {
+ indio_dev = iio_allocate_device(sizeof(*st));
+ if (indio_dev == NULL) {
ret = -ENOMEM;
goto error_ret;
}
- spi_set_drvdata(spi, st);
-
+ 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];
- st->idev = iio_allocate_device(0);
- if (st->idev == NULL) {
- ret = -ENOMEM;
- goto error_free_st;
- }
- st->idev->dev.parent = &spi->dev;
+ indio_dev->dev.parent = &spi->dev;
+ indio_dev->info = &ad2s120x_info;
+ indio_dev->modes = INDIO_DIRECT_MODE;
- st->idev->info = &ad2s120x_info;
- st->idev->dev_data = (void *)(st);
- st->idev->modes = INDIO_DIRECT_MODE;
-
- ret = iio_device_register(st->idev);
+ ret = iio_device_register(indio_dev);
if (ret)
goto error_free_dev;
@@ -266,9 +137,7 @@ static int __devinit ad2s120x_probe(struct spi_device *spi)
return 0;
error_free_dev:
- iio_free_device(st->idev);
-error_free_st:
- kfree(st);
+ iio_free_device(indio_dev);
error_ret:
for (--pn; pn >= 0; pn--)
gpio_free(pins[pn]);
@@ -277,10 +146,7 @@ error_ret:
static int __devexit ad2s120x_remove(struct spi_device *spi)
{
- struct ad2s120x_state *st = spi_get_drvdata(spi);
-
- iio_device_unregister(st->idev);
- kfree(st);
+ iio_device_unregister(spi_get_drvdata(spi));
return 0;
}
generated by cgit v1.2.3 (git 2.0.4) at 2024-05-27 16:08:17 +0000