static int _snd_pcm_hw_param_min(struct snd_pcm_hw_params *params,
snd_pcm_hw_param_t var, unsigned int val,
int dir)
{
int changed;
int open = 0;
if (dir)
{
if (dir > 0)
{
open = 1;
}
else if (dir < 0)
{
if (val > 0)
{
open = 1;
val--;
}
}
}
if (hw_is_mask(var))
changed = snd_mask_refine_min(hw_param_mask(params, var), val + !!open);
else if (hw_is_interval(var))
changed = snd_interval_refine_min(hw_param_interval(params, var), val, open);
else
return -EINVAL;
if (changed)
{
params->cmask |= 1 << var;
params->rmask |= 1 << var;
}
return changed;
}
static int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params,
snd_pcm_hw_param_t var, unsigned int val,
int dir)
{
int changed;
if (hw_is_mask(var)) {
struct snd_mask *m = hw_param_mask(params, var);
if (val == 0 && dir < 0) {
changed = -EINVAL;
snd_mask_none(m);
} else {
if (dir > 0)
val++;
else if (dir < 0)
val--;
changed = snd_mask_refine_set(
hw_param_mask(params, var), val);
}
} else if (hw_is_interval(var)) {
struct snd_interval *i = hw_param_interval(params, var);
if (val == 0 && dir < 0) {
changed = -EINVAL;
snd_interval_none(i);
} else if (dir == 0)
changed = snd_interval_refine_set(i, val);
else {
struct snd_interval t;
t.openmin = 1;
t.openmax = 1;
t.empty = 0;
t.integer = 0;
if (dir < 0) {
t.min = val - 1;
t.max = val;
} else {
t.min = val;
t.max = val+1;
}
changed = snd_interval_refine(i, &t);
}
} else {
return -EINVAL;
}
if (changed) {
params->cmask |= 1 << var;
params->rmask |= 1 << var;
}
return changed;
}
/**
* snd_pcm_hw_param_value_max
* @params: the hw_params instance
* @var: parameter to retrieve
* @dir: pointer to the direction (-1,0,1) or NULL
*
* Return the maximum value for field PAR.
*/
static unsigned int
snd_pcm_hw_param_value_max(const struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var, int *dir)
{
if (hw_is_mask(var))
{
if (dir)
*dir = 0;
return snd_mask_max(hw_param_mask_c(params, var));
}
if (hw_is_interval(var))
{
const struct snd_interval *i = hw_param_interval_c(params, var);
if (dir)
*dir = - (int) i->openmax;
return snd_interval_max(i);
}
return -EINVAL;
}
/**
* \brief _ksnd_pcm_hw_param_value
*
* Implementation is copied directly from Linux's not-exported-to-modules
* snd_pcm_hw_param_value function.
*
* \param params the hw_params instance
* \param var parameter to retrieve
* \param dir pointer to the direction (-1,0,1) or NULL
*
* \return Return the value for field PAR if it's fixed in
* configuration space defined by PARAMS. Return -EINVAL otherwise
*/
static int _ksnd_pcm_hw_param_value(const ksnd_pcm_hw_params_t *params,
snd_pcm_hw_param_t var, int *dir)
{
if (hw_is_mask(var))
{
const struct snd_mask *mask = hw_param_mask_c(params, var);
if (!snd_mask_single(mask))
return -EINVAL;
if (dir)
*dir = 0;
return snd_mask_value(mask);
}
if (hw_is_interval(var))
{
const struct snd_interval *i = hw_param_interval_c(params, var);
if (!snd_interval_single(i))
return -EINVAL;
if (dir)
*dir = i->openmin;
return snd_interval_value(i);
}
return -EINVAL;
}