[ALSA] Move OSS-specific hw_params helper to snd-pcm-oss module

Move EXPORT_SYMBOL()s to places adjacent to functions/variables.
Also move OSS-specific hw_params helper functions to pcm_oss.c.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 481 insertions, 0 deletions

diff --git a/sound/core/oss/pcm_oss.c b/sound/core/oss/pcm_oss.c
index ac990bf0b48..0d2e232afe6 100644
--- a/sound/core/oss/pcm_oss.c
+++ b/sound/core/oss/pcm_oss.c
@@ -78,6 +78,487 @@ static inline void snd_leave_user(mm_segment_t fs)
         set_fs(fs);
 }
 
+/*
+ * helper functions to process hw_params
+ */
+static int snd_interval_refine_min(struct snd_interval *i, unsigned int min, int openmin)
+{
+        int changed = 0;
+        if (i->min < min) {
+                i->min = min;
+                i->openmin = openmin;
+                changed = 1;
+        } else if (i->min == min && !i->openmin && openmin) {
+                i->openmin = 1;
+                changed = 1;
+        }
+        if (i->integer) {
+                if (i->openmin) {
+                        i->min++;
+                        i->openmin = 0;
+                }
+        }
+        if (snd_interval_checkempty(i)) {
+                snd_interval_none(i);
+                return -EINVAL;
+        }
+        return changed;
+}
+
+static int snd_interval_refine_max(struct snd_interval *i, unsigned int max, int openmax)
+{
+        int changed = 0;
+        if (i->max > max) {
+                i->max = max;
+                i->openmax = openmax;
+                changed = 1;
+        } else if (i->max == max && !i->openmax && openmax) {
+                i->openmax = 1;
+                changed = 1;
+        }
+        if (i->integer) {
+                if (i->openmax) {
+                        i->max--;
+                        i->openmax = 0;
+                }
+        }
+        if (snd_interval_checkempty(i)) {
+                snd_interval_none(i);
+                return -EINVAL;
+        }
+        return changed;
+}
+
+static int snd_interval_refine_set(struct snd_interval *i, unsigned int val)
+{
+        struct snd_interval t;
+        t.empty = 0;
+        t.min = t.max = val;
+        t.openmin = t.openmax = 0;
+        t.integer = 1;
+        return snd_interval_refine(i, &t);
+}
+
+/**
+ * snd_pcm_hw_param_value_min
+ * @params: the hw_params instance
+ * @var: parameter to retrieve
+ * @dir: pointer to the direction (-1,0,1) or NULL
+ *
+ * Return the minimum value for field PAR.
+ */
+static unsigned int
+snd_pcm_hw_param_value_min(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_min(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 = i->openmin;
+                return snd_interval_min(i);
+        }
+        return -EINVAL;
+}
+
+/**
+ * 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;
+}
+
+static int _snd_pcm_hw_param_mask(struct snd_pcm_hw_params *params,
+                                  snd_pcm_hw_param_t var,
+                                  const struct snd_mask *val)
+{
+        int changed;
+        changed = snd_mask_refine(hw_param_mask(params, var), val);
+        if (changed) {
+                params->cmask |= 1 << var;
+                params->rmask |= 1 << var;
+        }
+        return changed;
+}
+
+static int snd_pcm_hw_param_mask(struct snd_pcm_substream *pcm,
+                                 struct snd_pcm_hw_params *params,
+                                 snd_pcm_hw_param_t var,
+                                 const struct snd_mask *val)
+{
+        int changed = _snd_pcm_hw_param_mask(params, var, val);
+        if (changed < 0)
+                return changed;
+        if (params->rmask) {
+                int err = snd_pcm_hw_refine(pcm, params);
+                if (err < 0)
+                        return err;
+        }
+        return 0;
+}
+
+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;
+}
+
+/**
+ * snd_pcm_hw_param_min
+ * @pcm: PCM instance
+ * @params: the hw_params instance
+ * @var: parameter to retrieve
+ * @val: minimal value
+ * @dir: pointer to the direction (-1,0,1) or NULL
+ *
+ * Inside configuration space defined by PARAMS remove from PAR all 
+ * values < VAL. Reduce configuration space accordingly.
+ * Return new minimum or -EINVAL if the configuration space is empty
+ */
+static int snd_pcm_hw_param_min(struct snd_pcm_substream *pcm,
+                                struct snd_pcm_hw_params *params,
+                                snd_pcm_hw_param_t var, unsigned int val,
+                                int *dir)
+{
+        int changed = _snd_pcm_hw_param_min(params, var, val, dir ? *dir : 0);
+        if (changed < 0)
+                return changed;
+        if (params->rmask) {
+                int err = snd_pcm_hw_refine(pcm, params);
+                if (err < 0)
+                        return err;
+        }
+        return snd_pcm_hw_param_value_min(params, var, dir);
+}
+
+static int _snd_pcm_hw_param_max(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) {
+                        open = 1;
+                        val++;
+                }
+        }
+        if (hw_is_mask(var)) {
+                if (val == 0 && open) {
+                        snd_mask_none(hw_param_mask(params, var));
+                        changed = -EINVAL;
+                } else
+                        changed = snd_mask_refine_max(hw_param_mask(params, var),
+                                                      val - !!open);
+        } else if (hw_is_interval(var))
+                changed = snd_interval_refine_max(hw_param_interval(params, var),
+                                                  val, open);
+        else
+                return -EINVAL;
+        if (changed) {
+                params->cmask |= 1 << var;
+                params->rmask |= 1 << var;
+        }
+        return changed;
+}
+
+/**
+ * snd_pcm_hw_param_max
+ * @pcm: PCM instance
+ * @params: the hw_params instance
+ * @var: parameter to retrieve
+ * @val: maximal value
+ * @dir: pointer to the direction (-1,0,1) or NULL
+ *
+ * Inside configuration space defined by PARAMS remove from PAR all 
+ *  values >= VAL + 1. Reduce configuration space accordingly.
+ *  Return new maximum or -EINVAL if the configuration space is empty
+ */
+static int snd_pcm_hw_param_max(struct snd_pcm_substream *pcm,
+                                struct snd_pcm_hw_params *params,
+                                snd_pcm_hw_param_t var, unsigned int val,
+                                int *dir)
+{
+        int changed = _snd_pcm_hw_param_max(params, var, val, dir ? *dir : 0);
+        if (changed < 0)
+                return changed;
+        if (params->rmask) {
+                int err = snd_pcm_hw_refine(pcm, params);
+                if (err < 0)
+                        return err;
+        }
+        return snd_pcm_hw_param_value_max(params, var, dir);
+}
+
+static int boundary_sub(int a, int adir,
+                        int b, int bdir,
+                        int *c, int *cdir)
+{
+        adir = adir < 0 ? -1 : (adir > 0 ? 1 : 0);
+        bdir = bdir < 0 ? -1 : (bdir > 0 ? 1 : 0);
+        *c = a - b;
+        *cdir = adir - bdir;
+        if (*cdir == -2) {
+                (*c)--;
+        } else if (*cdir == 2) {
+                (*c)++;
+        }
+        return 0;
+}
+
+static int boundary_lt(unsigned int a, int adir,
+                       unsigned int b, int bdir)
+{
+        if (adir < 0) {
+                a--;
+                adir = 1;
+        } else if (adir > 0)
+                adir = 1;
+        if (bdir < 0) {
+                b--;
+                bdir = 1;
+        } else if (bdir > 0)
+                bdir = 1;
+        return a < b || (a == b && adir < bdir);
+}
+
+/* Return 1 if min is nearer to best than max */
+static int boundary_nearer(int min, int mindir,
+                           int best, int bestdir,
+                           int max, int maxdir)
+{
+        int dmin, dmindir;
+        int dmax, dmaxdir;
+        boundary_sub(best, bestdir, min, mindir, &dmin, &dmindir);
+        boundary_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir);
+        return boundary_lt(dmin, dmindir, dmax, dmaxdir);
+}
+
+/**
+ * snd_pcm_hw_param_near
+ * @pcm: PCM instance
+ * @params: the hw_params instance
+ * @var: parameter to retrieve
+ * @best: value to set
+ * @dir: pointer to the direction (-1,0,1) or NULL
+ *
+ * Inside configuration space defined by PARAMS set PAR to the available value
+ * nearest to VAL. Reduce configuration space accordingly.
+ * This function cannot be called for SNDRV_PCM_HW_PARAM_ACCESS,
+ * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
+ * Return the value found.
+  */
+static int snd_pcm_hw_param_near(struct snd_pcm_substream *pcm,
+                                 struct snd_pcm_hw_params *params,
+                                 snd_pcm_hw_param_t var, unsigned int best,
+                                 int *dir)
+{
+        struct snd_pcm_hw_params *save = NULL;
+        int v;
+        unsigned int saved_min;
+        int last = 0;
+        int min, max;
+        int mindir, maxdir;
+        int valdir = dir ? *dir : 0;
+        /* FIXME */
+        if (best > INT_MAX)
+                best = INT_MAX;
+        min = max = best;
+        mindir = maxdir = valdir;
+        if (maxdir > 0)
+                maxdir = 0;
+        else if (maxdir == 0)
+                maxdir = -1;
+        else {
+                maxdir = 1;
+                max--;
+        }
+        save = kmalloc(sizeof(*save), GFP_KERNEL);
+        if (save == NULL)
+                return -ENOMEM;
+        *save = *params;
+        saved_min = min;
+        min = snd_pcm_hw_param_min(pcm, params, var, min, &mindir);
+        if (min >= 0) {
+                struct snd_pcm_hw_params *params1;
+                if (max < 0)
+                        goto _end;
+                if ((unsigned int)min == saved_min && mindir == valdir)
+                        goto _end;
+                params1 = kmalloc(sizeof(*params1), GFP_KERNEL);
+                if (params1 == NULL) {
+                        kfree(save);
+                        return -ENOMEM;
+                }
+                *params1 = *save;
+                max = snd_pcm_hw_param_max(pcm, params1, var, max, &maxdir);
+                if (max < 0) {
+                        kfree(params1);
+                        goto _end;
+                }
+                if (boundary_nearer(max, maxdir, best, valdir, min, mindir)) {
+                        *params = *params1;
+                        last = 1;
+                }
+                kfree(params1);
+        } else {
+                *params = *save;
+                max = snd_pcm_hw_param_max(pcm, params, var, max, &maxdir);
+                snd_assert(max >= 0, return -EINVAL);
+                last = 1;
+        }
+ _end:
+        kfree(save);
+        if (last)
+                v = snd_pcm_hw_param_last(pcm, params, var, dir);
+        else
+                v = snd_pcm_hw_param_first(pcm, params, var, dir);
+        snd_assert(v >= 0, return -EINVAL);
+        return v;
+}
+
+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_set
+ * @pcm: PCM instance
+ * @params: the hw_params instance
+ * @var: parameter to retrieve
+ * @val: value to set
+ * @dir: pointer to the direction (-1,0,1) or NULL
+ *
+ * Inside configuration space defined by PARAMS remove from PAR all 
+ * values != VAL. Reduce configuration space accordingly.
+ *  Return VAL or -EINVAL if the configuration space is empty
+ */
+static int snd_pcm_hw_param_set(struct snd_pcm_substream *pcm,
+                                struct snd_pcm_hw_params *params,
+                                snd_pcm_hw_param_t var, unsigned int val,
+                                int dir)
+{
+        int changed = _snd_pcm_hw_param_set(params, var, val, dir);
+        if (changed < 0)
+                return changed;
+        if (params->rmask) {
+                int err = snd_pcm_hw_refine(pcm, params);
+                if (err < 0)
+                        return err;
+        }
+        return snd_pcm_hw_param_value(params, var, NULL);
+}
+
+static int _snd_pcm_hw_param_setinteger(struct snd_pcm_hw_params *params,
+                                        snd_pcm_hw_param_t var)
+{
+        int changed;
+        changed = snd_interval_setinteger(hw_param_interval(params, var));
+        if (changed) {
+                params->cmask |= 1 << var;
+                params->rmask |= 1 << var;
+        }
+        return changed;
+}
+        
+/*
+ * plugin
+ */
+
 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
 static int snd_pcm_oss_plugin_clear(struct snd_pcm_substream *substream)
 {