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staging:iio: Switch the channel masks to bitmaps so as to allow for more channels.

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This is as light as possible on changes to current drivers.
Some drivers make assumptions that their masks fit in a single
long.  Given they were previously working this is clearly valid if
not tidy.

The max1363 is an example where there should be no such assumptions.

V2: Add the new ad5933

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>
This commit is contained in:
Jonathan Cameron 2011-09-02 17:14:38 +01:00 committed by Greg Kroah-Hartman
parent bd94c6a8a6
commit 32b5eecab0
20 changed files with 188 additions and 135 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/staging/iio/accel/lis3l02dq_ring.c
View File

@ -61,8 +61,9 @@ ssize_t lis3l02dq_read_accel_from_ring(struct iio_ring_buffer *ring,
ret = ring->access->read_last(ring, (u8 *)data);
if (ret)
goto error_free_data;
*val = data[bitmap_weight(&ring->scan_mask, index)];
*val = data[bitmap_weight(ring->scan_mask, index)];
error_free_data:
kfree(data);
return ret;
@ -99,7 +100,7 @@ static int lis3l02dq_read_all(struct iio_dev *indio_dev, u8 *rx_array)
mutex_lock(&st->buf_lock);
for (i = 0; i < ARRAY_SIZE(read_all_tx_array)/4; i++)
if (ring->scan_mask & (1 << i)) {
if (test_bit(i, ring->scan_mask)) {
/* lower byte */
xfers[j].tx_buf = st->tx + 2*j;
st->tx[2*j] = read_all_tx_array[i*4];

6
drivers/staging/iio/adc/ad7192.c
View File

@ -146,7 +146,7 @@ struct ad7192_state {
u32 mode;
u32 conf;
u32 scale_avail[8][2];
u32 available_scan_masks[9];
long available_scan_masks[9];
u8 gpocon;
u8 devid;
/*
@ -460,7 +460,7 @@ static int ad7192_scan_from_ring(struct ad7192_state *st, unsigned ch, int *val)
s64 dat64[2];
u32 *dat32 = (u32 *)dat64;
if (!(ring->scan_mask & (1 << ch)))
if (!(test_bit(ch, ring->scan_mask)))
return -EBUSY;
ret = ring->access->read_last(ring, (u8 *) &dat64);
@ -482,7 +482,7 @@ static int ad7192_ring_preenable(struct iio_dev *indio_dev)
if (!ring->scan_count)
return -EINVAL;
channel = __ffs(ring->scan_mask);
channel = find_first_bit(ring->scan_mask, indio_dev->masklength);
d_size = ring->scan_count *
indio_dev->channels[0].scan_type.storagebits / 8;

4
drivers/staging/iio/adc/ad7298_ring.c
View File

@ -24,7 +24,7 @@ int ad7298_scan_from_ring(struct iio_dev *dev_info, long ch)
int ret;
u16 *ring_data;
if (!(ring->scan_mask & (1 << ch))) {
if (!(test_bit(ch, ring->scan_mask))) {
ret = -EBUSY;
goto error_ret;
}
@ -79,7 +79,7 @@ static int ad7298_ring_preenable(struct iio_dev *indio_dev)
command = AD7298_WRITE | st->ext_ref;
for (i = 0, m = AD7298_CH(0); i < AD7298_MAX_CHAN; i++, m >>= 1)
if (ring->scan_mask & (1 << i))
if (test_bit(i, ring->scan_mask))
command |= m;
st->tx_buf[0] = cpu_to_be16(command);

18
drivers/staging/iio/adc/ad7793.c
View File

@ -51,7 +51,8 @@ struct ad7793_state {
u16 mode;
u16 conf;
u32 scale_avail[8][2];
u32 available_scan_masks[7];
/* Note this uses fact that 8 the mask always fits in a long */
unsigned long available_scan_masks[7];
/*
* DMA (thus cache coherency maintenance) requires the
* transfer buffers to live in their own cache lines.
@ -321,7 +322,7 @@ static int ad7793_scan_from_ring(struct ad7793_state *st, unsigned ch, int *val)
s64 dat64[2];
u32 *dat32 = (u32 *)dat64;
if (!(ring->scan_mask & (1 << ch)))
if (!(test_bit(ch, ring->scan_mask)))
return -EBUSY;
ret = ring->access->read_last(ring, (u8 *) &dat64);
@ -343,7 +344,8 @@ static int ad7793_ring_preenable(struct iio_dev *indio_dev)
if (!ring->scan_count)
return -EINVAL;
channel = __ffs(ring->scan_mask);
channel = find_first_bit(ring->scan_mask,
indio_dev->masklength);
d_size = ring->scan_count *
indio_dev->channels[0].scan_type.storagebits / 8;
@ -875,10 +877,12 @@ static int __devinit ad7793_probe(struct spi_device *spi)
indio_dev->num_channels = 7;
indio_dev->info = &ad7793_info;
for (i = 0; i < indio_dev->num_channels; i++)
st->available_scan_masks[i] = (1 << i) | (1 <<
indio_dev->channels[indio_dev->num_channels - 1].
scan_index);
for (i = 0; i < indio_dev->num_channels; i++) {
set_bit(i, &st->available_scan_masks[i]);
set_bit(indio_dev->
channels[indio_dev->num_channels - 1].scan_index,
&st->available_scan_masks[i]);
}
init_waitqueue_head(&st->wq_data_avail);

4
drivers/staging/iio/adc/ad7887.h
View File

@ -83,11 +83,11 @@ enum ad7887_supported_device_ids {
};
#ifdef CONFIG_IIO_RING_BUFFER
int ad7887_scan_from_ring(struct ad7887_state *st, long mask);
int ad7887_scan_from_ring(struct ad7887_state *st, int channum);
int ad7887_register_ring_funcs_and_init(struct iio_dev *indio_dev);
void ad7887_ring_cleanup(struct iio_dev *indio_dev);
#else /* CONFIG_IIO_RING_BUFFER */
static inline int ad7887_scan_from_ring(struct ad7887_state *st, long mask)
static inline int ad7887_scan_from_ring(struct ad7887_state *st, int channum)
{
return 0;
}

10
drivers/staging/iio/adc/ad7887_ring.c
View File

@ -19,13 +19,13 @@
#include "ad7887.h"
int ad7887_scan_from_ring(struct ad7887_state *st, long mask)
int ad7887_scan_from_ring(struct ad7887_state *st, int channum)
{
struct iio_ring_buffer *ring = iio_priv_to_dev(st)->ring;
int count = 0, ret;
u16 *ring_data;
if (!(ring->scan_mask & mask)) {
if (!(test_bit(channum, ring->scan_mask))) {
ret = -EBUSY;
goto error_ret;
}
@ -41,7 +41,8 @@ int ad7887_scan_from_ring(struct ad7887_state *st, long mask)
goto error_free_ring_data;
/* for single channel scan the result is stored with zero offset */
if ((ring->scan_mask == ((1 << 1) | (1 << 0))) && (mask == (1 << 1)))
if ((test_bit(1, ring->scan_mask) || test_bit(0, ring->scan_mask)) &&
(channum == 1))
count = 1;
ret = be16_to_cpu(ring_data[count]);
@ -78,7 +79,8 @@ static int ad7887_ring_preenable(struct iio_dev *indio_dev)
indio_dev->ring->access->set_bytes_per_datum(indio_dev->ring,
st->d_size);
switch (ring->scan_mask) {
/* We know this is a single long so can 'cheat' */
switch (*ring->scan_mask) {
case (1 << 0):
st->ring_msg = &st->msg[AD7887_CH0];
break;

4
drivers/staging/iio/adc/ad799x.h
View File

@ -124,11 +124,11 @@ struct ad799x_platform_data {
int ad7997_8_set_scan_mode(struct ad799x_state *st, unsigned mask);
#ifdef CONFIG_AD799X_RING_BUFFER
int ad799x_single_channel_from_ring(struct ad799x_state *st, long mask);
int ad799x_single_channel_from_ring(struct ad799x_state *st, int channum);
int ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev);
void ad799x_ring_cleanup(struct iio_dev *indio_dev);
#else /* CONFIG_AD799X_RING_BUFFER */
int ad799x_single_channel_from_ring(struct ad799x_state *st, long mask)
int ad799x_single_channel_from_ring(struct ad799x_state *st, int channum)
{
return -EINVAL;
}

2
drivers/staging/iio/adc/ad799x_core.c
View File

@ -151,7 +151,7 @@ static int ad799x_read_raw(struct iio_dev *dev_info,
mutex_lock(&dev_info->mlock);
if (iio_ring_enabled(dev_info))
ret = ad799x_single_channel_from_ring(st,
1 << chan->address);
chan->address);
else
ret = ad799x_scan_direct(st, chan->address);
mutex_unlock(&dev_info->mlock);

18
drivers/staging/iio/adc/ad799x_ring.c
View File

@ -23,13 +23,13 @@
#include "ad799x.h"
int ad799x_single_channel_from_ring(struct ad799x_state *st, long mask)
int ad799x_single_channel_from_ring(struct ad799x_state *st, int channum)
{
struct iio_ring_buffer *ring = iio_priv_to_dev(st)->ring;
int count = 0, ret;
u16 *ring_data;
if (!(ring->scan_mask & mask)) {
if (!(test_bit(channum, ring->scan_mask))) {
ret = -EBUSY;
goto error_ret;
}
@ -44,13 +44,7 @@ int ad799x_single_channel_from_ring(struct ad799x_state *st, long mask)
if (ret)
goto error_free_ring_data;
/* Need a count of channels prior to this one */
mask >>= 1;
while (mask) {
if (mask & ring->scan_mask)
count++;
mask >>= 1;
}
count = bitmap_weight(ring->scan_mask, channum);
ret = be16_to_cpu(ring_data[count]);
error_free_ring_data:
@ -77,7 +71,7 @@ static int ad799x_ring_preenable(struct iio_dev *indio_dev)
*/
if (st->id == ad7997 || st->id == ad7998)
ad7997_8_set_scan_mode(st, ring->scan_mask);
ad7997_8_set_scan_mode(st, *ring->scan_mask);
st->d_size = ring->scan_count * 2;
@ -121,12 +115,12 @@ static irqreturn_t ad799x_trigger_handler(int irq, void *p)
case ad7991:
case ad7995:
case ad7999:
cmd = st->config | (ring->scan_mask << AD799X_CHANNEL_SHIFT);
cmd = st->config | (*ring->scan_mask << AD799X_CHANNEL_SHIFT);
break;
case ad7992:
case ad7993:
case ad7994:
cmd = (ring->scan_mask << AD799X_CHANNEL_SHIFT) |
cmd = (*ring->scan_mask << AD799X_CHANNEL_SHIFT) |
AD7998_CONV_RES_REG;
break;
case ad7997:

8
drivers/staging/iio/adc/max1363.h
View File

@ -57,6 +57,7 @@
#define MAX1363_SCAN_MASK 0x60
#define MAX1363_SE_DE_MASK 0x01
#define MAX1363_MAX_CHANNELS 25
/**
* struct max1363_mode - scan mode information
* @conf: The corresponding value of the configuration register
@ -64,7 +65,7 @@
*/
struct max1363_mode {
int8_t conf;
long modemask;
DECLARE_BITMAP(modemask, MAX1363_MAX_CHANNELS);
};
/* This must be maintained along side the max1363_mode_table in max1363_core */
@ -145,13 +146,14 @@ struct max1363_state {
};
const struct max1363_mode
*max1363_match_mode(u32 mask, const struct max1363_chip_info *ci);
*max1363_match_mode(unsigned long *mask, const struct max1363_chip_info *ci);
int max1363_set_scan_mode(struct max1363_state *st);
#ifdef CONFIG_MAX1363_RING_BUFFER
int max1363_single_channel_from_ring(long mask, struct max1363_state *st);
int max1363_single_channel_from_ring(const long *mask,
struct max1363_state *st);
int max1363_register_ring_funcs_and_init(struct iio_dev *indio_dev);
void max1363_ring_cleanup(struct iio_dev *indio_dev);

37
drivers/staging/iio/adc/max1363_core.c
View File

@ -42,14 +42,14 @@
.conf = MAX1363_CHANNEL_SEL(_num) \
| MAX1363_CONFIG_SCAN_SINGLE_1 \
| MAX1363_CONFIG_SE, \
.modemask = _mask, \
.modemask[0] = _mask, \
}
#define MAX1363_MODE_SCAN_TO_CHANNEL(_num, _mask) { \
.conf = MAX1363_CHANNEL_SEL(_num) \
| MAX1363_CONFIG_SCAN_TO_CS \
| MAX1363_CONFIG_SE, \
.modemask = _mask, \
.modemask[0] = _mask, \
}
/* note not available for max1363 hence naming */
@ -57,14 +57,14 @@
.conf = MAX1363_CHANNEL_SEL(_num) \
| MAX1236_SCAN_MID_TO_CHANNEL \
| MAX1363_CONFIG_SE, \
.modemask = _mask \
.modemask[0] = _mask \
}
#define MAX1363_MODE_DIFF_SINGLE(_nump, _numm, _mask) { \
.conf = MAX1363_CHANNEL_SEL(_nump) \
| MAX1363_CONFIG_SCAN_SINGLE_1 \
| MAX1363_CONFIG_DE, \
.modemask = _mask \
.modemask[0] = _mask \
}
/* Can't think how to automate naming so specify for now */
@ -72,7 +72,7 @@
.conf = MAX1363_CHANNEL_SEL(_num) \
| MAX1363_CONFIG_SCAN_TO_CS \
| MAX1363_CONFIG_DE, \
.modemask = _mask \
.modemask[0] = _mask \
}
/* note only available for max1363 hence naming */
@ -80,7 +80,7 @@
.conf = MAX1363_CHANNEL_SEL(_num) \
| MAX1236_SCAN_MID_TO_CHANNEL \
| MAX1363_CONFIG_SE, \
.modemask = _mask \
.modemask[0] = _mask \
}
static const struct max1363_mode max1363_mode_table[] = {
@ -147,13 +147,15 @@ static const struct max1363_mode max1363_mode_table[] = {
};
const struct max1363_mode
*max1363_match_mode(u32 mask, const struct max1363_chip_info *ci)
*max1363_match_mode(unsigned long *mask, const struct max1363_chip_info *ci)
{
int i;
if (mask)
for (i = 0; i < ci->num_modes; i++)
if (!((~max1363_mode_table[ci->mode_list[i]].modemask) &
mask))
if (bitmap_subset(mask,
max1363_mode_table[ci->mode_list[i]].
modemask,
MAX1363_MAX_CHANNELS))
return &max1363_mode_table[ci->mode_list[i]];
return NULL;
}
@ -187,7 +189,7 @@ static int max1363_read_single_chan(struct iio_dev *indio_dev,
int ret = 0;
s32 data;
char rxbuf[2];
long mask;
const unsigned long *mask;
struct max1363_state *st = iio_priv(indio_dev);
struct i2c_client *client = st->client;
@ -644,7 +646,7 @@ static int max1363_monitor_mode_update(struct max1363_state *st, int enabled)
int ret, i = 3, j;
unsigned long numelements;
int len;
long modemask;
const long *modemask;
if (!enabled) {
/* transition to ring capture is not currently supported */
@ -672,7 +674,7 @@ static int max1363_monitor_mode_update(struct max1363_state *st, int enabled)
st->configbyte |= max1363_mode_table[d1m0to3m2].conf;
modemask = max1363_mode_table[d1m0to3m2].modemask;
}
numelements = hweight_long(modemask);
numelements = bitmap_weight(modemask, MAX1363_MAX_CHANNELS);
len = 3 * numelements + 3;
tx_buf = kmalloc(len, GFP_KERNEL);
if (!tx_buf) {
@ -688,7 +690,7 @@ static int max1363_monitor_mode_update(struct max1363_state *st, int enabled)
* setup to match what we need.
*/
for (j = 0; j < 8; j++)
if (modemask & (1 << j)) {
if (test_bit(j, modemask)) {
/* Establish the mode is in the scan */
if (st->mask_low & (1 << j)) {
tx_buf[i] = (st->thresh_low[j] >> 4) & 0xFF;
@ -1281,7 +1283,7 @@ static int __devinit max1363_probe(struct i2c_client *client,
st->client = client;
indio_dev->available_scan_masks
= kzalloc(sizeof(*indio_dev->available_scan_masks)*
= kzalloc(BITS_TO_LONGS(MAX1363_MAX_CHANNELS)*
(st->chip_info->num_modes + 1), GFP_KERNEL);
if (!indio_dev->available_scan_masks) {
ret = -ENOMEM;
@ -1289,9 +1291,10 @@ static int __devinit max1363_probe(struct i2c_client *client,
}
for (i = 0; i < st->chip_info->num_modes; i++)
indio_dev->available_scan_masks[i] =
max1363_mode_table[st->chip_info->mode_list[i]]
.modemask;
bitmap_copy(indio_dev->available_scan_masks +
BITS_TO_LONGS(MAX1363_MAX_CHANNELS)*i,
max1363_mode_table[st->chip_info->mode_list[i]]
.modemask, MAX1363_MAX_CHANNELS);
/* Estabilish that the iio_dev is a child of the i2c device */
indio_dev->dev.parent = &client->dev;
indio_dev->name = id->name;

22
drivers/staging/iio/adc/max1363_ring.c
View File

@ -21,12 +21,14 @@
#include "max1363.h"
int max1363_single_channel_from_ring(long mask, struct max1363_state *st)
int max1363_single_channel_from_ring(const long *mask, struct max1363_state *st)
{
struct iio_ring_buffer *ring = iio_priv_to_dev(st)->ring;
int count = 0, ret;
int count = 0, ret, index;
u8 *ring_data;
if (!(st->current_mode->modemask & mask)) {
index = find_first_bit(mask, MAX1363_MAX_CHANNELS);
if (!(test_bit(index, st->current_mode->modemask))) {
ret = -EBUSY;
goto error_ret;
}
@ -41,12 +43,8 @@ int max1363_single_channel_from_ring(long mask, struct max1363_state *st)
if (ret)
goto error_free_ring_data;
/* Need a count of channels prior to this one */
mask >>= 1;
while (mask) {
if (mask & st->current_mode->modemask)
count++;
mask >>= 1;
}
count = bitmap_weight(mask, index - 1);
if (st->chip_info->bits != 8)
ret = ((int)(ring_data[count*2 + 0] & 0x0F) << 8)
+ (int)(ring_data[count*2 + 1]);
@ -85,7 +83,8 @@ static int max1363_ring_preenable(struct iio_dev *indio_dev)
max1363_set_scan_mode(st);
numvals = hweight_long(st->current_mode->modemask);
numvals = bitmap_weight(st->current_mode->modemask,
indio_dev->masklength);
if (ring->access->set_bytes_per_datum) {
if (ring->scan_timestamp)
d_size += sizeof(s64);
@ -110,7 +109,8 @@ static irqreturn_t max1363_trigger_handler(int irq, void *p)
__u8 *rxbuf;
int b_sent;
size_t d_size;
unsigned long numvals = hweight_long(st->current_mode->modemask);
unsigned long numvals = bitmap_weight(st->current_mode->modemask,
MAX1363_MAX_CHANNELS);
/* Ensure the timestamp is 8 byte aligned */
if (st->chip_info->bits != 8)

5
drivers/staging/iio/iio.h
View File

@ -272,6 +272,8 @@ struct iio_info {
* @mlock: [INTERN] lock used to prevent simultaneous device state
* changes
* @available_scan_masks: [DRIVER] optional array of allowed bitmasks
* @masklength: [INTERN] the length of the mask established from
* channels
* @trig: [INTERN] current device trigger (ring buffer modes)
* @pollfunc: [DRIVER] function run on trigger being received
* @channels: [DRIVER] channel specification structure table
@ -294,7 +296,8 @@ struct iio_dev {
struct iio_ring_buffer *ring;
struct mutex mlock;
u32 *available_scan_masks;
unsigned long *available_scan_masks;
unsigned masklength;
struct iio_trigger *trig;
struct iio_poll_func *pollfunc;

2
drivers/staging/iio/impedance-analyzer/ad5933.c
View File

@ -640,7 +640,7 @@ static void ad5933_work(struct work_struct *work)
if (status & AD5933_STAT_DATA_VALID) {
ad5933_i2c_read(st->client,
(ring->scan_mask & (1 << 0)) ?
test_bit(1, ring->scan_mask) ?
AD5933_REG_REAL_DATA : AD5933_REG_IMAG_DATA,
ring->scan_count * 2, (u8 *)buf);

5
drivers/staging/iio/imu/adis16400_ring.c
View File

@ -85,7 +85,7 @@ static int adis16350_spi_read_all(struct device *dev, u8 *rx)
return -ENOMEM;
for (i = 0; i < ARRAY_SIZE(read_all_tx_array); i++)
if (indio_dev->ring->scan_mask & (1 << i)) {
if (test_bit(i, indio_dev->ring->scan_mask)) {
xfers[j].tx_buf = &read_all_tx_array[i];
xfers[j].bits_per_word = 16;
xfers[j].len = 2;
@ -117,7 +117,8 @@ static irqreturn_t adis16400_trigger_handler(int irq, void *p)
int i = 0, j, ret = 0;
s16 *data;
size_t datasize = ring->access->get_bytes_per_datum(ring);
unsigned long mask = ring->scan_mask;
/* Asumption that long is enough for maximum channels */
unsigned long mask = *ring->scan_mask;
data = kmalloc(datasize , GFP_KERNEL);
if (data == NULL) {

103
drivers/staging/iio/industrialio-ring.c
View File

@ -132,9 +132,7 @@ static ssize_t iio_scan_el_show(struct device *dev,
static int iio_scan_mask_clear(struct iio_ring_buffer *ring, int bit)
{
if (bit > IIO_MAX_SCAN_LENGTH)
return -EINVAL;
ring->scan_mask &= ~(1 << bit);
clear_bit(bit, ring->scan_mask);
ring->scan_count--;
return 0;
}
@ -323,11 +321,27 @@ int iio_ring_buffer_register(struct iio_dev *indio_dev,
if (channels) {
/* new magic */
for (i = 0; i < num_channels; i++) {
/* Establish necessary mask length */
if (channels[i].scan_index >
(int)indio_dev->masklength - 1)
indio_dev->masklength
= indio_dev->channels[i].scan_index + 1;
ret = iio_ring_add_channel_sysfs(indio_dev,
&channels[i]);
if (ret < 0)
goto error_cleanup_group;
}
if (indio_dev->masklength && ring->scan_mask == NULL) {
ring->scan_mask
= kzalloc(sizeof(*ring->scan_mask)*
BITS_TO_LONGS(indio_dev->masklength),
GFP_KERNEL);
if (ring->scan_mask == NULL) {
ret = -ENOMEM;
goto error_cleanup_group;
}
}
}
return 0;
@ -343,6 +357,7 @@ EXPORT_SYMBOL(iio_ring_buffer_register);
void iio_ring_buffer_unregister(struct iio_dev *indio_dev)
{
kfree(indio_dev->ring->scan_mask);
if (indio_dev->ring->attrs)
sysfs_remove_group(&indio_dev->dev.kobj,
indio_dev->ring->attrs);
@ -539,3 +554,85 @@ int iio_sw_ring_preenable(struct iio_dev *indio_dev)
return 0;
}
EXPORT_SYMBOL(iio_sw_ring_preenable);
/* note NULL used as error indicator as it doesn't make sense. */
static unsigned long *iio_scan_mask_match(unsigned long *av_masks,
unsigned int masklength,
unsigned long *mask)
{
if (bitmap_empty(mask, masklength))
return NULL;
while (*av_masks) {
if (bitmap_subset(mask, av_masks, masklength))
return av_masks;
av_masks += BITS_TO_LONGS(masklength);
}
return NULL;
}
/**
* iio_scan_mask_set() - set particular bit in the scan mask
* @ring: the ring buffer whose scan mask we are interested in
* @bit: the bit to be set.
**/
int iio_scan_mask_set(struct iio_ring_buffer *ring, int bit)
{
struct iio_dev *dev_info = ring->indio_dev;
unsigned long *mask;
unsigned long *trialmask;
trialmask = kmalloc(sizeof(*trialmask)*
BITS_TO_LONGS(dev_info->masklength),
GFP_KERNEL);
if (trialmask == NULL)
return -ENOMEM;
if (!dev_info->masklength) {
WARN_ON("trying to set scan mask prior to registering ring\n");
kfree(trialmask);
return -EINVAL;
}
bitmap_copy(trialmask, ring->scan_mask, dev_info->masklength);
set_bit(bit, trialmask);
if (dev_info->available_scan_masks) {
mask = iio_scan_mask_match(dev_info->available_scan_masks,
dev_info->masklength,
trialmask);
if (!mask) {
kfree(trialmask);
return -EINVAL;
}
}
bitmap_copy(ring->scan_mask, trialmask, dev_info->masklength);
ring->scan_count++;
kfree(trialmask);
return 0;
};
EXPORT_SYMBOL_GPL(iio_scan_mask_set);
int iio_scan_mask_query(struct iio_ring_buffer *ring, int bit)
{
struct iio_dev *dev_info = ring->indio_dev;
long *mask;
if (bit > dev_info->masklength)
return -EINVAL;
if (!ring->scan_mask)
return 0;
if (dev_info->available_scan_masks)
mask = iio_scan_mask_match(dev_info->available_scan_masks,
dev_info->masklength,
ring->scan_mask);
else
mask = ring->scan_mask;
if (!mask)
return 0;
return test_bit(bit, mask);
};
EXPORT_SYMBOL_GPL(iio_scan_mask_query);

2
drivers/staging/iio/meter/ade7758.h
View File

@ -122,7 +122,7 @@ struct ade7758_state {
u8 *tx;
u8 *rx;
struct mutex buf_lock;
u32 available_scan_masks[AD7758_NUM_WAVESRC];
unsigned long available_scan_masks[AD7758_NUM_WAVESRC];
struct iio_chan_spec *ade7758_ring_channels;
struct spi_transfer ring_xfer[4];
struct spi_message ring_msg;

2
drivers/staging/iio/meter/ade7758_core.c
View File

@ -767,7 +767,7 @@ static int __devinit ade7758_probe(struct spi_device *spi)
indio_dev->modes = INDIO_DIRECT_MODE;
for (i = 0; i < AD7758_NUM_WAVESRC; i++)
st->available_scan_masks[i] = 1 << i;
set_bit(i, &st->available_scan_masks[i]);
indio_dev->available_scan_masks = st->available_scan_masks;

2
drivers/staging/iio/meter/ade7758_ring.c
View File

@ -98,7 +98,7 @@ static int ade7758_ring_preenable(struct iio_dev *indio_dev)
if (!ring->scan_count)
return -EINVAL;
channel = __ffs(ring->scan_mask);
channel = find_first_bit(ring->scan_mask, indio_dev->masklength);
d_size = st->ade7758_ring_channels[channel].scan_type.storagebits / 8;

64
drivers/staging/iio/ring_generic.h
View File

@ -104,7 +104,7 @@ struct iio_ring_buffer {
int bpe;
struct attribute_group *scan_el_attrs;
int scan_count;
unsigned long scan_mask;
long *scan_mask;
bool scan_timestamp;
const struct iio_ring_access_funcs *access;
const struct iio_ring_setup_ops *setup_ops;
@ -124,6 +124,8 @@ struct iio_ring_buffer {
void iio_ring_buffer_init(struct iio_ring_buffer *ring,
struct iio_dev *dev_info);
void iio_ring_buffer_deinit(struct iio_ring_buffer *ring);
/**
* __iio_update_ring_buffer() - update common elements of ring buffers
* @ring: ring buffer that is the event source
@ -137,70 +139,14 @@ static inline void __iio_update_ring_buffer(struct iio_ring_buffer *ring,
ring->length = length;
}
/*
* These are mainly provided to allow for a change of implementation if a device
* has a large number of scan elements
*/
#define IIO_MAX_SCAN_LENGTH 31
/* note 0 used as error indicator as it doesn't make sense. */
static inline u32 iio_scan_mask_match(u32 *av_masks, u32 mask)
{
while (*av_masks) {
if (!(~*av_masks & mask))
return *av_masks;
av_masks++;
}
return 0;
}
static inline int iio_scan_mask_query(struct iio_ring_buffer *ring, int bit)
{
struct iio_dev *dev_info = ring->indio_dev;
u32 mask;
if (bit > IIO_MAX_SCAN_LENGTH)
return -EINVAL;
if (!ring->scan_mask)
return 0;
if (dev_info->available_scan_masks)
mask = iio_scan_mask_match(dev_info->available_scan_masks,
ring->scan_mask);
else
mask = ring->scan_mask;
if (!mask)
return -EINVAL;
return !!(mask & (1 << bit));
};
int iio_scan_mask_query(struct iio_ring_buffer *ring, int bit);
/**
* iio_scan_mask_set() - set particular bit in the scan mask
* @ring: the ring buffer whose scan mask we are interested in
* @bit: the bit to be set.
**/
static inline int iio_scan_mask_set(struct iio_ring_buffer *ring, int bit)
{
struct iio_dev *dev_info = ring->indio_dev;
u32 mask;
u32 trialmask = ring->scan_mask | (1 << bit);
if (bit > IIO_MAX_SCAN_LENGTH)
return -EINVAL;
if (dev_info->available_scan_masks) {
mask = iio_scan_mask_match(dev_info->available_scan_masks,
trialmask);
if (!mask)
return -EINVAL;
}
ring->scan_mask = trialmask;
ring->scan_count++;
return 0;
};
int iio_scan_mask_set(struct iio_ring_buffer *ring, int bit);
#define to_iio_ring_buffer(d) \
container_of(d, struct iio_ring_buffer, dev)