[PATCH 1/3] staging:iio:dac:ad5446: Convert to channel spec
Lars-Peter Clausen
lars at metafoo.de
Tue Nov 15 15:31:22 UTC 2011
Signed-off-by: Lars-Peter Clausen <lars at metafoo.de>
Acked-by: Jonathan Cameron <jic23 at cam.ac.uk>
---
drivers/staging/iio/dac/ad5446.c | 181 +++++++++++++++++---------------------
drivers/staging/iio/dac/ad5446.h | 10 +--
2 files changed, 83 insertions(+), 108 deletions(-)
diff --git a/drivers/staging/iio/dac/ad5446.c b/drivers/staging/iio/dac/ad5446.c
index e1c204d..a5882b8 100644
--- a/drivers/staging/iio/dac/ad5446.c
+++ b/drivers/staging/iio/dac/ad5446.c
@@ -26,19 +26,17 @@
static void ad5446_store_sample(struct ad5446_state *st, unsigned val)
{
- st->data.d16 = cpu_to_be16(AD5446_LOAD |
- (val << st->chip_info->left_shift));
+ st->data.d16 = cpu_to_be16(AD5446_LOAD | val);
}
static void ad5542_store_sample(struct ad5446_state *st, unsigned val)
{
- st->data.d16 = cpu_to_be16(val << st->chip_info->left_shift);
+ st->data.d16 = cpu_to_be16(val);
}
static void ad5620_store_sample(struct ad5446_state *st, unsigned val)
{
- st->data.d16 = cpu_to_be16(AD5620_LOAD |
- (val << st->chip_info->left_shift));
+ st->data.d16 = cpu_to_be16(AD5620_LOAD | val);
}
static void ad5660_store_sample(struct ad5446_state *st, unsigned val)
@@ -63,50 +61,6 @@ static void ad5660_store_pwr_down(struct ad5446_state *st, unsigned mode)
st->data.d24[2] = val & 0xFF;
}
-static ssize_t ad5446_write(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct ad5446_state *st = iio_priv(indio_dev);
- int ret;
- long val;
-
- ret = strict_strtol(buf, 10, &val);
- if (ret)
- goto error_ret;
-
- if (val > RES_MASK(st->chip_info->bits)) {
- ret = -EINVAL;
- goto error_ret;
- }
-
- mutex_lock(&indio_dev->mlock);
- st->cached_val = val;
- st->chip_info->store_sample(st, val);
- ret = spi_sync(st->spi, &st->msg);
- mutex_unlock(&indio_dev->mlock);
-
-error_ret:
- return ret ? ret : len;
-}
-
-static IIO_DEV_ATTR_OUT_RAW(0, ad5446_write, 0);
-
-static ssize_t ad5446_show_scale(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct ad5446_state *st = iio_priv(indio_dev);
- /* Corresponds to Vref / 2^(bits) */
- unsigned int scale_uv = (st->vref_mv * 1000) >> st->chip_info->bits;
-
- return sprintf(buf, "%d.%03d\n", scale_uv / 1000, scale_uv % 1000);
-}
-static IIO_DEVICE_ATTR(out_voltage_scale, S_IRUGO, ad5446_show_scale, NULL, 0);
-
static ssize_t ad5446_write_powerdown_mode(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
@@ -189,8 +143,6 @@ static IIO_DEVICE_ATTR(out_voltage0_powerdown, S_IRUGO | S_IWUSR,
ad5446_write_dac_powerdown, 0);
static struct attribute *ad5446_attributes[] = {
- &iio_dev_attr_out_voltage0_raw.dev_attr.attr,
- &iio_dev_attr_out_voltage_scale.dev_attr.attr,
&iio_dev_attr_out_voltage0_powerdown.dev_attr.attr,
&iio_dev_attr_out_voltage_powerdown_mode.dev_attr.attr,
&iio_const_attr_out_voltage_powerdown_mode_available.dev_attr.attr,
@@ -223,121 +175,148 @@ static const struct attribute_group ad5446_attribute_group = {
.is_visible = ad5446_attr_is_visible,
};
+#define AD5446_CHANNEL(bits, storage, shift) { \
+ .type = IIO_VOLTAGE, \
+ .indexed = 1, \
+ .output = 1, \
+ .channel = 0, \
+ .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT, \
+ .scan_type = IIO_ST('u', (bits), (storage), (shift)) \
+}
+
static const struct ad5446_chip_info ad5446_chip_info_tbl[] = {
[ID_AD5444] = {
- .bits = 12,
- .storagebits = 16,
- .left_shift = 2,
+ .channel = AD5446_CHANNEL(12, 16, 2),
.store_sample = ad5446_store_sample,
},
[ID_AD5446] = {
- .bits = 14,
- .storagebits = 16,
- .left_shift = 0,
+ .channel = AD5446_CHANNEL(14, 16, 0),
.store_sample = ad5446_store_sample,
},
[ID_AD5541A] = {
- .bits = 16,
- .storagebits = 16,
- .left_shift = 0,
+ .channel = AD5446_CHANNEL(16, 16, 0),
.store_sample = ad5542_store_sample,
},
[ID_AD5542A] = {
- .bits = 16,
- .storagebits = 16,
- .left_shift = 0,
+ .channel = AD5446_CHANNEL(16, 16, 0),
.store_sample = ad5542_store_sample,
},
[ID_AD5543] = {
- .bits = 16,
- .storagebits = 16,
- .left_shift = 0,
+ .channel = AD5446_CHANNEL(16, 16, 0),
.store_sample = ad5542_store_sample,
},
[ID_AD5512A] = {
- .bits = 12,
- .storagebits = 16,
- .left_shift = 4,
+ .channel = AD5446_CHANNEL(12, 16, 4),
.store_sample = ad5542_store_sample,
},
[ID_AD5553] = {
- .bits = 14,
- .storagebits = 16,
- .left_shift = 0,
+ .channel = AD5446_CHANNEL(14, 16, 0),
.store_sample = ad5542_store_sample,
},
[ID_AD5601] = {
- .bits = 8,
- .storagebits = 16,
- .left_shift = 6,
+ .channel = AD5446_CHANNEL(8, 16, 6),
.store_sample = ad5542_store_sample,
.store_pwr_down = ad5620_store_pwr_down,
},
[ID_AD5611] = {
- .bits = 10,
- .storagebits = 16,
- .left_shift = 4,
+ .channel = AD5446_CHANNEL(10, 16, 4),
.store_sample = ad5542_store_sample,
.store_pwr_down = ad5620_store_pwr_down,
},
[ID_AD5621] = {
- .bits = 12,
- .storagebits = 16,
- .left_shift = 2,
+ .channel = AD5446_CHANNEL(12, 16, 2),
.store_sample = ad5542_store_sample,
.store_pwr_down = ad5620_store_pwr_down,
},
[ID_AD5620_2500] = {
- .bits = 12,
- .storagebits = 16,
- .left_shift = 2,
+ .channel = AD5446_CHANNEL(12, 16, 2),
.int_vref_mv = 2500,
.store_sample = ad5620_store_sample,
.store_pwr_down = ad5620_store_pwr_down,
},
[ID_AD5620_1250] = {
- .bits = 12,
- .storagebits = 16,
- .left_shift = 2,
+ .channel = AD5446_CHANNEL(12, 16, 2),
.int_vref_mv = 1250,
.store_sample = ad5620_store_sample,
.store_pwr_down = ad5620_store_pwr_down,
},
[ID_AD5640_2500] = {
- .bits = 14,
- .storagebits = 16,
- .left_shift = 0,
+ .channel = AD5446_CHANNEL(14, 16, 0),
.int_vref_mv = 2500,
.store_sample = ad5620_store_sample,
.store_pwr_down = ad5620_store_pwr_down,
},
[ID_AD5640_1250] = {
- .bits = 14,
- .storagebits = 16,
- .left_shift = 0,
+ .channel = AD5446_CHANNEL(14, 16, 0),
.int_vref_mv = 1250,
.store_sample = ad5620_store_sample,
.store_pwr_down = ad5620_store_pwr_down,
},
[ID_AD5660_2500] = {
- .bits = 16,
- .storagebits = 24,
- .left_shift = 0,
+ .channel = AD5446_CHANNEL(16, 16, 0),
.int_vref_mv = 2500,
.store_sample = ad5660_store_sample,
.store_pwr_down = ad5660_store_pwr_down,
},
[ID_AD5660_1250] = {
- .bits = 16,
- .storagebits = 24,
- .left_shift = 0,
+ .channel = AD5446_CHANNEL(16, 16, 0),
.int_vref_mv = 1250,
.store_sample = ad5660_store_sample,
.store_pwr_down = ad5660_store_pwr_down,
},
};
+static int ad5446_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val,
+ int *val2,
+ long m)
+{
+ struct ad5446_state *st = iio_priv(indio_dev);
+ unsigned long scale_uv;
+
+ switch (m) {
+ case IIO_CHAN_INFO_SCALE:
+ scale_uv = (st->vref_mv * 1000) >> chan->scan_type.realbits;
+ *val = scale_uv / 1000;
+ *val2 = (scale_uv % 1000) * 1000;
+ return IIO_VAL_INT_PLUS_MICRO;
+
+ }
+ return -EINVAL;
+}
+
+static int ad5446_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val,
+ int val2,
+ long mask)
+{
+ struct ad5446_state *st = iio_priv(indio_dev);
+ int ret;
+
+ switch (mask) {
+ case 0:
+ if (val >= (1 << chan->scan_type.realbits) || val < 0)
+ return -EINVAL;
+
+ val <<= chan->scan_type.shift;
+ mutex_lock(&indio_dev->mlock);
+ st->cached_val = val;
+ st->chip_info->store_sample(st, val);
+ ret = spi_sync(st->spi, &st->msg);
+ mutex_unlock(&indio_dev->mlock);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
static const struct iio_info ad5446_info = {
+ .read_raw = ad5446_read_raw,
+ .write_raw = ad5446_write_raw,
.attrs = &ad5446_attribute_group,
.driver_module = THIS_MODULE,
};
@@ -376,11 +355,13 @@ static int __devinit ad5446_probe(struct spi_device *spi)
indio_dev->name = spi_get_device_id(spi)->name;
indio_dev->info = &ad5446_info;
indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->channels = &st->chip_info->channel;
+ indio_dev->num_channels = 1;
/* Setup default message */
st->xfer.tx_buf = &st->data;
- st->xfer.len = st->chip_info->storagebits / 8;
+ st->xfer.len = st->chip_info->channel.scan_type.storagebits / 8;
spi_message_init(&st->msg);
spi_message_add_tail(&st->xfer, &st->msg);
diff --git a/drivers/staging/iio/dac/ad5446.h b/drivers/staging/iio/dac/ad5446.h
index 7118d65..4ea3476 100644
--- a/drivers/staging/iio/dac/ad5446.h
+++ b/drivers/staging/iio/dac/ad5446.h
@@ -25,8 +25,6 @@
#define AD5660_PWRDWN_100k (0x2 << 16) /* Power-down: 100kOhm to GND */
#define AD5660_PWRDWN_TRISTATE (0x3 << 16) /* Power-down: Three-state */
-#define RES_MASK(bits) ((1 << (bits)) - 1)
-
#define MODE_PWRDWN_1k 0x1
#define MODE_PWRDWN_100k 0x2
#define MODE_PWRDWN_TRISTATE 0x3
@@ -62,18 +60,14 @@ struct ad5446_state {
/**
* struct ad5446_chip_info - chip specific information
- * @bits: accuracy of the DAC in bits
- * @storagebits: number of bits written to the DAC
- * @left_shift: number of bits the datum must be shifted
+ * @channel: channel spec for the DAC
* @int_vref_mv: AD5620/40/60: the internal reference voltage
* @store_sample: chip specific helper function to store the datum
* @store_sample: chip specific helper function to store the powerpown cmd
*/
struct ad5446_chip_info {
- u8 bits;
- u8 storagebits;
- u8 left_shift;
+ struct iio_chan_spec channel;
u16 int_vref_mv;
void (*store_sample) (struct ad5446_state *st, unsigned val);
void (*store_pwr_down) (struct ad5446_state *st, unsigned mode);
--
1.7.7.1
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