diff options
author | Jonathan Cameron <jic23@cam.ac.uk> | 2011-06-27 13:07:52 +0100 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-06-28 14:39:50 -0700 |
commit | 8f2bd8363feb26546972a7c5a53db49b524ab703 (patch) | |
tree | 1ba228b3846d2176accc38e2b3447bc017b70beb | |
parent | b19e9ad5e2cb9145c81690cec7c826b156d5b3c1 (diff) | |
download | op-kernel-dev-8f2bd8363feb26546972a7c5a53db49b524ab703.zip op-kernel-dev-8f2bd8363feb26546972a7c5a53db49b524ab703.tar.gz |
staging:iio:resolver:ad2s120x cleanup.
I've currently squashed the vel + pos combined attribute. If people need them
precisely paired I doubt they will get them from the sysfs interface anyway.
If that is a requirement it should come via a buffer implementation.
Note this patch leaves the completely non standard interface alone.
That will get fixed later.
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>
-rw-r--r-- | drivers/staging/iio/resolver/ad2s120x.c | 196 |
1 files changed, 31 insertions, 165 deletions
diff --git a/drivers/staging/iio/resolver/ad2s120x.c b/drivers/staging/iio/resolver/ad2s120x.c index f83e142..bed4c72 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; } |