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yaml
---
r: 249829
b: refs/heads/master
c: 01a99e1
h: refs/heads/master
i:
  249827: a8bac83
v: v3
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Michael Hennerich authored and Greg Kroah-Hartman committed May 19, 2011
1 parent 06a263c commit e55aa5c
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Showing 4 changed files with 104 additions and 124 deletions.
2 changes: 1 addition & 1 deletion [refs]
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Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
---
refs/heads/master: 6684e5b47dd4ef1cedde6f029cc1d9f7c5097d6e
refs/heads/master: 01a99e182333cc3b885028eaec9fde158dde4f16
5 changes: 2 additions & 3 deletions trunk/drivers/staging/iio/adc/ad7298.h
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Original file line number Diff line number Diff line change
Expand Up @@ -17,14 +17,13 @@
#define AD7298_TAVG (1 << 1) /* temperature sensor averaging enable */
#define AD7298_PDD (1 << 0) /* partial power down enable */

#define AD7298_CH_MASK (AD7298_CH0 | AD7298_CH1 | AD7298_CH2 | AD7298_CH3 | \
AD7298_CH4 | AD7298_CH5 | AD7298_CH6 | AD7298_CH7)

#define AD7298_MAX_CHAN 8
#define AD7298_BITS 12
#define AD7298_STORAGE_BITS 16
#define AD7298_INTREF_mV 2500

#define AD7298_CH_TEMP 9

#define RES_MASK(bits) ((1 << (bits)) - 1)

/*
Expand Down
171 changes: 97 additions & 74 deletions trunk/drivers/staging/iio/adc/ad7298_core.c
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,37 @@

#include "ad7298.h"

static struct iio_chan_spec ad7298_channels[] = {
IIO_CHAN(IIO_TEMP, 0, 1, 0, NULL, 0, 0,
(1 << IIO_CHAN_INFO_SCALE_SEPARATE),
9, AD7298_CH_TEMP, IIO_ST('s', 32, 32, 0), 0),
IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 0, 0,
(1 << IIO_CHAN_INFO_SCALE_SHARED),
0, 0, IIO_ST('u', 12, 16, 0), 0),
IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 1, 0,
(1 << IIO_CHAN_INFO_SCALE_SHARED),
1, 1, IIO_ST('u', 12, 16, 0), 0),
IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 2, 0,
(1 << IIO_CHAN_INFO_SCALE_SHARED),
2, 2, IIO_ST('u', 12, 16, 0), 0),
IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 3, 0,
(1 << IIO_CHAN_INFO_SCALE_SHARED),
3, 3, IIO_ST('u', 12, 16, 0), 0),
IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 4, 0,
(1 << IIO_CHAN_INFO_SCALE_SHARED),
4, 4, IIO_ST('u', 12, 16, 0), 0),
IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 5, 0,
(1 << IIO_CHAN_INFO_SCALE_SHARED),
5, 5, IIO_ST('u', 12, 16, 0), 0),
IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 6, 0,
(1 << IIO_CHAN_INFO_SCALE_SHARED),
6, 6, IIO_ST('u', 12, 16, 0), 0),
IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 7, 0,
(1 << IIO_CHAN_INFO_SCALE_SHARED),
7, 7, IIO_ST('u', 12, 16, 0), 0),
IIO_CHAN_SOFT_TIMESTAMP(8),
};

static int ad7298_scan_direct(struct ad7298_state *st, unsigned ch)
{
int ret;
Expand All @@ -35,55 +66,28 @@ static int ad7298_scan_direct(struct ad7298_state *st, unsigned ch)
return be16_to_cpu(st->rx_buf[0]);
}

static ssize_t ad7298_scan(struct device *dev,
struct device_attribute *attr,
char *buf)
static int ad7298_scan_temp(struct ad7298_state *st, int *val)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7298_state *st = dev_info->dev_data;
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
int ret;
int tmp, ret;

mutex_lock(&dev_info->mlock);
if (iio_ring_enabled(dev_info))
ret = ad7298_scan_from_ring(st, this_attr->address);
else
ret = ad7298_scan_direct(st, this_attr->address);
mutex_unlock(&dev_info->mlock);
tmp = cpu_to_be16(AD7298_WRITE | AD7298_TSENSE |
AD7298_TAVG | st->ext_ref);

if (ret < 0)
ret = spi_write(st->spi, (u8 *)&tmp, 2);
if (ret)
return ret;

return sprintf(buf, "%d\n", ret & RES_MASK(AD7298_BITS));
}

static IIO_DEV_ATTR_IN_RAW(0, ad7298_scan, 0);
static IIO_DEV_ATTR_IN_RAW(1, ad7298_scan, 1);
static IIO_DEV_ATTR_IN_RAW(2, ad7298_scan, 2);
static IIO_DEV_ATTR_IN_RAW(3, ad7298_scan, 3);
static IIO_DEV_ATTR_IN_RAW(4, ad7298_scan, 4);
static IIO_DEV_ATTR_IN_RAW(5, ad7298_scan, 5);
static IIO_DEV_ATTR_IN_RAW(6, ad7298_scan, 6);
static IIO_DEV_ATTR_IN_RAW(7, ad7298_scan, 7);

static ssize_t ad7298_show_temp(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7298_state *st = iio_dev_get_devdata(dev_info);
int tmp;
tmp = 0;

tmp = cpu_to_be16(AD7298_WRITE | AD7298_TSENSE |
AD7298_TAVG | st->ext_ref);
ret = spi_write(st->spi, (u8 *)&tmp, 2);
if (ret)
return ret;

mutex_lock(&dev_info->mlock);
spi_write(st->spi, (u8 *)&tmp, 2);
tmp = 0;
spi_write(st->spi, (u8 *)&tmp, 2);
usleep_range(101, 1000); /* sleep > 100us */
spi_read(st->spi, (u8 *)&tmp, 2);
mutex_unlock(&dev_info->mlock);

ret = spi_read(st->spi, (u8 *)&tmp, 2);
if (ret)
return ret;

tmp = be16_to_cpu(tmp) & RES_MASK(AD7298_BITS);

Expand All @@ -100,41 +104,56 @@ static ssize_t ad7298_show_temp(struct device *dev,
tmp *= 250; /* temperature in milli degrees Celsius */
}

return sprintf(buf, "%d\n", tmp);
}
*val = tmp;

static IIO_DEVICE_ATTR(temp0_input, S_IRUGO, ad7298_show_temp, NULL, 0);
return 0;
}

static ssize_t ad7298_show_scale(struct device *dev,
struct device_attribute *attr,
char *buf)
static int ad7298_read_raw(struct iio_dev *dev_info,
struct iio_chan_spec const *chan,
int *val,
int *val2,
long m)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7298_state *st = iio_dev_get_devdata(dev_info);
/* Corresponds to Vref / 2^(bits) */
unsigned int scale_uv = (st->int_vref_mv * 1000) >> AD7298_BITS;

return sprintf(buf, "%d.%03d\n", scale_uv / 1000, scale_uv % 1000);
int ret;
struct ad7298_state *st = dev_info->dev_data;
unsigned int scale_uv;

switch (m) {
case 0:
mutex_lock(&dev_info->mlock);
if (iio_ring_enabled(dev_info)) {
if (chan->address == AD7298_CH_TEMP)
ret = -ENODEV;
else
ret = ad7298_scan_from_ring(st, chan->address);
} else {
if (chan->address == AD7298_CH_TEMP)
ret = ad7298_scan_temp(st, val);
else
ret = ad7298_scan_direct(st, chan->address);
}
mutex_unlock(&dev_info->mlock);

if (ret < 0)
return ret;

if (chan->address != AD7298_CH_TEMP)
*val = ret & RES_MASK(AD7298_BITS);

return IIO_VAL_INT;
case (1 << IIO_CHAN_INFO_SCALE_SHARED):
scale_uv = (st->int_vref_mv * 1000) >> AD7298_BITS;
*val = scale_uv / 1000;
*val2 = (scale_uv % 1000) * 1000;
return IIO_VAL_INT_PLUS_MICRO;
case (1 << IIO_CHAN_INFO_SCALE_SEPARATE):
*val = 1;
*val2 = 0;
return IIO_VAL_INT_PLUS_MICRO;
}
return -EINVAL;
}
static IIO_DEVICE_ATTR(in_scale, S_IRUGO, ad7298_show_scale, NULL, 0);

static struct attribute *ad7298_attributes[] = {
&iio_dev_attr_in0_raw.dev_attr.attr,
&iio_dev_attr_in1_raw.dev_attr.attr,
&iio_dev_attr_in2_raw.dev_attr.attr,
&iio_dev_attr_in3_raw.dev_attr.attr,
&iio_dev_attr_in4_raw.dev_attr.attr,
&iio_dev_attr_in5_raw.dev_attr.attr,
&iio_dev_attr_in6_raw.dev_attr.attr,
&iio_dev_attr_in7_raw.dev_attr.attr,
&iio_dev_attr_in_scale.dev_attr.attr,
&iio_dev_attr_temp0_input.dev_attr.attr,
NULL,
};

static const struct attribute_group ad7298_attribute_group = {
.attrs = ad7298_attributes,
};

static int __devinit ad7298_probe(struct spi_device *spi)
{
Expand Down Expand Up @@ -167,10 +186,12 @@ static int __devinit ad7298_probe(struct spi_device *spi)

st->indio_dev->name = spi_get_device_id(spi)->name;
st->indio_dev->dev.parent = &spi->dev;
st->indio_dev->attrs = &ad7298_attribute_group;
st->indio_dev->dev_data = (void *)(st);
st->indio_dev->driver_module = THIS_MODULE;
st->indio_dev->modes = INDIO_DIRECT_MODE;
st->indio_dev->channels = ad7298_channels;
st->indio_dev->num_channels = ARRAY_SIZE(ad7298_channels);
st->indio_dev->read_raw = &ad7298_read_raw;

/* Setup default message */

Expand Down Expand Up @@ -203,7 +224,9 @@ static int __devinit ad7298_probe(struct spi_device *spi)
if (ret)
goto error_free_device;

ret = iio_ring_buffer_register(st->indio_dev->ring, 0);
ret = iio_ring_buffer_register_ex(st->indio_dev->ring, 0,
&ad7298_channels[1], /* skip temp0 */
ARRAY_SIZE(ad7298_channels) - 1);
if (ret)
goto error_cleanup_ring;
return 0;
Expand Down
50 changes: 4 additions & 46 deletions trunk/drivers/staging/iio/adc/ad7298_ring.c
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Original file line number Diff line number Diff line change
Expand Up @@ -21,49 +21,6 @@

#include "ad7298.h"

static IIO_SCAN_EL_C(in0, 0, 0, NULL);
static IIO_SCAN_EL_C(in1, 1, 0, NULL);
static IIO_SCAN_EL_C(in2, 2, 0, NULL);
static IIO_SCAN_EL_C(in3, 3, 0, NULL);
static IIO_SCAN_EL_C(in4, 4, 0, NULL);
static IIO_SCAN_EL_C(in5, 5, 0, NULL);
static IIO_SCAN_EL_C(in6, 6, 0, NULL);
static IIO_SCAN_EL_C(in7, 7, 0, NULL);

static IIO_SCAN_EL_TIMESTAMP(8);
static IIO_CONST_ATTR_SCAN_EL_TYPE(timestamp, s, 64, 64);

static IIO_CONST_ATTR(in_type, "u12/16") ;

static struct attribute *ad7298_scan_el_attrs[] = {
&iio_scan_el_in0.dev_attr.attr,
&iio_const_attr_in0_index.dev_attr.attr,
&iio_scan_el_in1.dev_attr.attr,
&iio_const_attr_in1_index.dev_attr.attr,
&iio_scan_el_in2.dev_attr.attr,
&iio_const_attr_in2_index.dev_attr.attr,
&iio_scan_el_in3.dev_attr.attr,
&iio_const_attr_in3_index.dev_attr.attr,
&iio_scan_el_in4.dev_attr.attr,
&iio_const_attr_in4_index.dev_attr.attr,
&iio_scan_el_in5.dev_attr.attr,
&iio_const_attr_in5_index.dev_attr.attr,
&iio_scan_el_in6.dev_attr.attr,
&iio_const_attr_in6_index.dev_attr.attr,
&iio_scan_el_in7.dev_attr.attr,
&iio_const_attr_in7_index.dev_attr.attr,
&iio_const_attr_timestamp_index.dev_attr.attr,
&iio_scan_el_timestamp.dev_attr.attr,
&iio_const_attr_timestamp_type.dev_attr.attr,
&iio_const_attr_in_type.dev_attr.attr,
NULL,
};

static struct attribute_group ad7298_scan_el_group = {
.name = "scan_elements",
.attrs = ad7298_scan_el_attrs,
};

int ad7298_scan_from_ring(struct ad7298_state *st, long ch)
{
struct iio_ring_buffer *ring = st->indio_dev->ring;
Expand All @@ -75,7 +32,8 @@ int ad7298_scan_from_ring(struct ad7298_state *st, long ch)
goto error_ret;
}

ring_data = kmalloc(ring->access.get_bytes_per_datum(ring), GFP_KERNEL);
ring_data = kmalloc(ring->access.get_bytes_per_datum(ring),
GFP_KERNEL);
if (ring_data == NULL) {
ret = -ENOMEM;
goto error_ret;
Expand Down Expand Up @@ -183,6 +141,7 @@ static irqreturn_t ad7298_trigger_handler(int irq, void *p)
buf[i] = be16_to_cpu(st->rx_buf[i]);

indio_dev->ring->access.store_to(ring, (u8 *)buf, time_ns);
iio_trigger_notify_done(indio_dev->trig);

return IRQ_HANDLED;
}
Expand Down Expand Up @@ -214,11 +173,10 @@ int ad7298_register_ring_funcs_and_init(struct iio_dev *indio_dev)
goto error_free_poll_func;
}
/* Ring buffer functions - here trigger setup related */

indio_dev->ring->preenable = &ad7298_ring_preenable;
indio_dev->ring->postenable = &iio_triggered_ring_postenable;
indio_dev->ring->predisable = &iio_triggered_ring_predisable;
indio_dev->ring->scan_el_attrs = &ad7298_scan_el_group;

indio_dev->ring->scan_timestamp = true;

/* Flag that polled ring buffering is possible */
Expand Down

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