/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef __SOUND_PCM_PARAMS_H
#define __SOUND_PCM_PARAMS_H

/*
 *  PCM params helpers
 *  Copyright (c) by Abramo Bagnara <abramo@alsa-project.org>
 */

#include <sound/pcm.h>

int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm, 
                           struct snd_pcm_hw_params *params,
                           snd_pcm_hw_param_t var, int *dir);
int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm, 
                          struct snd_pcm_hw_params *params,
                          snd_pcm_hw_param_t var, int *dir);
int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
                           snd_pcm_hw_param_t var, int *dir);

#define SNDRV_MASK_BITS 64      /* we use so far 64bits only */
#define SNDRV_MASK_SIZE (SNDRV_MASK_BITS / 32)
#define MASK_OFS(i)     ((i) >> 5)
#define MASK_BIT(i)     (1U << ((i) & 31))

static inline void snd_mask_none(struct snd_mask *mask)
{
        memset(mask, 0, sizeof(*mask));
}

static inline void snd_mask_any(struct snd_mask *mask)
{
        memset(mask, 0xff, SNDRV_MASK_SIZE * sizeof(u_int32_t));
}

static inline int snd_mask_empty(const struct snd_mask *mask)
{
        int i;
        for (i = 0; i < SNDRV_MASK_SIZE; i++)
                if (mask->bits[i])
                        return 0;
        return 1;
}

static inline unsigned int snd_mask_min(const struct snd_mask *mask)
{
        int i;
        for (i = 0; i < SNDRV_MASK_SIZE; i++) {
                if (mask->bits[i])
                        return __ffs(mask->bits[i]) + (i << 5);
        }
        return 0;
}

static inline unsigned int snd_mask_max(const struct snd_mask *mask)
{
        int i;
        for (i = SNDRV_MASK_SIZE - 1; i >= 0; i--) {
                if (mask->bits[i])
                        return __fls(mask->bits[i]) + (i << 5);
        }
        return 0;
}

static inline void snd_mask_set(struct snd_mask *mask, unsigned int val)
{
        mask->bits[MASK_OFS(val)] |= MASK_BIT(val);
}

/* Most of drivers need only this one */
static inline void snd_mask_set_format(struct snd_mask *mask,
                                       snd_pcm_format_t format)
{
        snd_mask_set(mask, (__force unsigned int)format);
}

static inline void snd_mask_reset(struct snd_mask *mask, unsigned int val)
{
        mask->bits[MASK_OFS(val)] &= ~MASK_BIT(val);
}

static inline void snd_mask_set_range(struct snd_mask *mask,
                                      unsigned int from, unsigned int to)
{
        unsigned int i;
        for (i = from; i <= to; i++)
                mask->bits[MASK_OFS(i)] |= MASK_BIT(i);
}

static inline void snd_mask_reset_range(struct snd_mask *mask,
                                        unsigned int from, unsigned int to)
{
        unsigned int i;
        for (i = from; i <= to; i++)
                mask->bits[MASK_OFS(i)] &= ~MASK_BIT(i);
}

static inline void snd_mask_leave(struct snd_mask *mask, unsigned int val)
{
        unsigned int v;
        v = mask->bits[MASK_OFS(val)] & MASK_BIT(val);
        snd_mask_none(mask);
        mask->bits[MASK_OFS(val)] = v;
}

static inline void snd_mask_intersect(struct snd_mask *mask,
                                      const struct snd_mask *v)
{
        int i;
        for (i = 0; i < SNDRV_MASK_SIZE; i++)
                mask->bits[i] &= v->bits[i];
}

static inline int snd_mask_eq(const struct snd_mask *mask,
                              const struct snd_mask *v)
{
        return ! memcmp(mask, v, SNDRV_MASK_SIZE * sizeof(u_int32_t));
}

static inline void snd_mask_copy(struct snd_mask *mask,
                                 const struct snd_mask *v)
{
        *mask = *v;
}

static inline int snd_mask_test(const struct snd_mask *mask, unsigned int val)
{
        return mask->bits[MASK_OFS(val)] & MASK_BIT(val);
}

/* Most of drivers need only this one */
static inline int snd_mask_test_format(const struct snd_mask *mask,
                                       snd_pcm_format_t format)
{
        return snd_mask_test(mask, (__force unsigned int)format);
}

static inline int snd_mask_single(const struct snd_mask *mask)
{
        int i, c = 0;
        for (i = 0; i < SNDRV_MASK_SIZE; i++) {
                if (! mask->bits[i])
                        continue;
                if (mask->bits[i] & (mask->bits[i] - 1))
                        return 0;
                if (c)
                        return 0;
                c++;
        }
        return 1;
}

static inline int snd_mask_refine(struct snd_mask *mask,
                                  const struct snd_mask *v)
{
        struct snd_mask old;
        snd_mask_copy(&old, mask);
        snd_mask_intersect(mask, v);
        if (snd_mask_empty(mask))
                return -EINVAL;
        return !snd_mask_eq(mask, &old);
}

static inline int snd_mask_refine_first(struct snd_mask *mask)
{
        if (snd_mask_single(mask))
                return 0;
        snd_mask_leave(mask, snd_mask_min(mask));
        return 1;
}

static inline int snd_mask_refine_last(struct snd_mask *mask)
{
        if (snd_mask_single(mask))
                return 0;
        snd_mask_leave(mask, snd_mask_max(mask));
        return 1;
}

static inline int snd_mask_refine_min(struct snd_mask *mask, unsigned int val)
{
        if (snd_mask_min(mask) >= val)
                return 0;
        snd_mask_reset_range(mask, 0, val - 1);
        if (snd_mask_empty(mask))
                return -EINVAL;
        return 1;
}

static inline int snd_mask_refine_max(struct snd_mask *mask, unsigned int val)
{
        if (snd_mask_max(mask) <= val)
                return 0;
        snd_mask_reset_range(mask, val + 1, SNDRV_MASK_BITS);
        if (snd_mask_empty(mask))
                return -EINVAL;
        return 1;
}

static inline int snd_mask_refine_set(struct snd_mask *mask, unsigned int val)
{
        int changed;
        changed = !snd_mask_single(mask);
        snd_mask_leave(mask, val);
        if (snd_mask_empty(mask))
                return -EINVAL;
        return changed;
}

static inline int snd_mask_value(const struct snd_mask *mask)
{
        return snd_mask_min(mask);
}

static inline void snd_interval_any(struct snd_interval *i)
{
        i->min = 0;
        i->openmin = 0;
        i->max = UINT_MAX;
        i->openmax = 0;
        i->integer = 0;
        i->empty = 0;
}

static inline void snd_interval_none(struct snd_interval *i)
{
        i->empty = 1;
}

static inline int snd_interval_checkempty(const struct snd_interval *i)
{
        return (i->min > i->max ||
                (i->min == i->max && (i->openmin || i->openmax)));
}

static inline int snd_interval_empty(const struct snd_interval *i)
{
        return i->empty;
}

static inline int snd_interval_single(const struct snd_interval *i)
{
        return (i->min == i->max || 
                (i->min + 1 == i->max && (i->openmin || i->openmax)));
}

static inline int snd_interval_value(const struct snd_interval *i)
{
        if (i->openmin && !i->openmax)
                return i->max;
        return i->min;
}

static inline int snd_interval_min(const struct snd_interval *i)
{
        return i->min;
}

static inline int snd_interval_max(const struct snd_interval *i)
{
        unsigned int v;
        v = i->max;
        if (i->openmax)
                v--;
        return v;
}

static inline int snd_interval_test(const struct snd_interval *i, unsigned int val)
{
        return !((i->min > val || (i->min == val && i->openmin) ||
                  i->max < val || (i->max == val && i->openmax)));
}

static inline void snd_interval_copy(struct snd_interval *d, const struct snd_interval *s)
{
        *d = *s;
}

static inline int snd_interval_setinteger(struct snd_interval *i)
{
        if (i->integer)
                return 0;
        if (i->openmin && i->openmax && i->min == i->max)
                return -EINVAL;
        i->integer = 1;
        return 1;
}

static inline int snd_interval_eq(const struct snd_interval *i1, const struct snd_interval *i2)
{
        if (i1->empty)
                return i2->empty;
        if (i2->empty)
                return i1->empty;
        return i1->min == i2->min && i1->openmin == i2->openmin &&
                i1->max == i2->max && i1->openmax == i2->openmax;
}

/**
 * params_access - get the access type from the hw params
 * @p: hw params
 */
static inline snd_pcm_access_t params_access(const struct snd_pcm_hw_params *p)
{
        return (__force snd_pcm_access_t)snd_mask_min(hw_param_mask_c(p,
                SNDRV_PCM_HW_PARAM_ACCESS));
}

/**
 * params_format - get the sample format from the hw params
 * @p: hw params
 */
static inline snd_pcm_format_t params_format(const struct snd_pcm_hw_params *p)
{
        return (__force snd_pcm_format_t)snd_mask_min(hw_param_mask_c(p,
                SNDRV_PCM_HW_PARAM_FORMAT));
}

/**
 * params_subformat - get the sample subformat from the hw params
 * @p: hw params
 */
static inline snd_pcm_subformat_t
params_subformat(const struct snd_pcm_hw_params *p)
{
        return (__force snd_pcm_subformat_t)snd_mask_min(hw_param_mask_c(p,
                SNDRV_PCM_HW_PARAM_SUBFORMAT));
}

/**
 * params_period_bytes - get the period size (in bytes) from the hw params
 * @p: hw params
 */
static inline unsigned int
params_period_bytes(const struct snd_pcm_hw_params *p)
{
        return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_BYTES)->min;
}

/**
 * params_width - get the number of bits of the sample format from the hw params
 * @p: hw params
 *
 * This function returns the number of bits per sample that the selected sample
 * format of the hw params has.
 */
static inline int params_width(const struct snd_pcm_hw_params *p)
{
        return snd_pcm_format_width(params_format(p));
}

/*
 * params_physical_width - get the storage size of the sample format from the hw params
 * @p: hw params
 *
 * This functions returns the number of bits per sample that the selected sample
 * format of the hw params takes up in memory. This will be equal or larger than
 * params_width().
 */
static inline int params_physical_width(const struct snd_pcm_hw_params *p)
{
        return snd_pcm_format_physical_width(params_format(p));
}

static inline void
params_set_format(struct snd_pcm_hw_params *p, snd_pcm_format_t fmt)
{
        snd_mask_set_format(hw_param_mask(p, SNDRV_PCM_HW_PARAM_FORMAT), fmt);
}

#endif /* __SOUND_PCM_PARAMS_H */