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ALSA: emu8000: Convert to generic PCM copy ops

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This patch converts the SB Emu8000 driver code to use the new unified
PCM copy callback.  The conversion is a bit complicated because of
many open code in emu8000_pcm.c.  GET_VAL() and LOOP_WRITE() macros
were rewritten / simplified with copy_from_iter().  As
copy_from_iter() updates the internal offset value, we can drop the
corresponding part, too.

Link: https://lore.kernel.org/r/20230815190136.8987-7-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2023-08-15 21:01:17 +02:00
parent e2964cd7ef
commit 9d0fdc602d
1 changed files with 16 additions and 58 deletions
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74
sound/isa/sb/emu8000_pcm.c
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@ -409,39 +409,25 @@ do { \
return -EAGAIN;\
} while (0)
enum {
COPY_USER, COPY_KERNEL, FILL_SILENCE,
};
#define GET_VAL(sval, buf, mode) \
#define GET_VAL(sval, iter) \
do { \
switch (mode) { \
case FILL_SILENCE: \
if (!iter) \
sval = 0; \
break; \
case COPY_KERNEL: \
sval = *buf++; \
break; \
default: \
if (get_user(sval, (unsigned short __user *)buf)) \
return -EFAULT; \
buf++; \
break; \
} \
else if (copy_from_iter(&sval, 2, iter) != 2) \
return -EFAULT; \
} while (0)
#ifdef USE_NONINTERLEAVE
#define LOOP_WRITE(rec, offset, _buf, count, mode) \
#define LOOP_WRITE(rec, offset, iter, count) \
do { \
struct snd_emu8000 *emu = (rec)->emu; \
unsigned short *buf = (__force unsigned short *)(_buf); \
snd_emu8000_write_wait(emu, 1); \
EMU8000_SMALW_WRITE(emu, offset); \
while (count > 0) { \
unsigned short sval; \
CHECK_SCHEDULER(); \
GET_VAL(sval, buf, mode); \
GET_VAL(sval, iter); \
EMU8000_SMLD_WRITE(emu, sval); \
count--; \
} \
@ -450,27 +436,14 @@ enum {
/* copy one channel block */
static int emu8k_pcm_copy(struct snd_pcm_substream *subs,
int voice, unsigned long pos,
void __user *src, unsigned long count)
struct iov_iter *src, unsigned long count)
{
struct snd_emu8k_pcm *rec = subs->runtime->private_data;
/* convert to word unit */
pos = (pos << 1) + rec->loop_start[voice];
count <<= 1;
LOOP_WRITE(rec, pos, src, count, COPY_USER);
return 0;
}
static int emu8k_pcm_copy_kernel(struct snd_pcm_substream *subs,
int voice, unsigned long pos,
void *src, unsigned long count)
{
struct snd_emu8k_pcm *rec = subs->runtime->private_data;
/* convert to word unit */
pos = (pos << 1) + rec->loop_start[voice];
count <<= 1;
LOOP_WRITE(rec, pos, src, count, COPY_KERNEL);
LOOP_WRITE(rec, pos, src, count);
return 0;
}
@ -483,16 +456,15 @@ static int emu8k_pcm_silence(struct snd_pcm_substream *subs,
/* convert to word unit */
pos = (pos << 1) + rec->loop_start[voice];
count <<= 1;
LOOP_WRITE(rec, pos, NULL, count, FILL_SILENCE);
LOOP_WRITE(rec, pos, USER_SOCKPTR(NULL), count);
return 0;
}
#else /* interleave */
#define LOOP_WRITE(rec, pos, _buf, count, mode) \
#define LOOP_WRITE(rec, pos, iter, count) \
do { \
struct snd_emu8000 *emu = rec->emu; \
unsigned short *buf = (__force unsigned short *)(_buf); \
snd_emu8000_write_wait(emu, 1); \
EMU8000_SMALW_WRITE(emu, pos + rec->loop_start[0]); \
if (rec->voices > 1) \
@ -500,11 +472,11 @@ static int emu8k_pcm_silence(struct snd_pcm_substream *subs,
while (count > 0) { \
unsigned short sval; \
CHECK_SCHEDULER(); \
GET_VAL(sval, buf, mode); \
GET_VAL(sval, iter); \
EMU8000_SMLD_WRITE(emu, sval); \
if (rec->voices > 1) { \
CHECK_SCHEDULER(); \
GET_VAL(sval, buf, mode); \
GET_VAL(sval, iter); \
EMU8000_SMRD_WRITE(emu, sval); \
} \
count--; \
@ -518,27 +490,14 @@ static int emu8k_pcm_silence(struct snd_pcm_substream *subs,
*/
static int emu8k_pcm_copy(struct snd_pcm_substream *subs,
int voice, unsigned long pos,
void __user *src, unsigned long count)
struct iov_iter *src, unsigned long count)
{
struct snd_emu8k_pcm *rec = subs->runtime->private_data;
/* convert to frames */
pos = bytes_to_frames(subs->runtime, pos);
count = bytes_to_frames(subs->runtime, count);
LOOP_WRITE(rec, pos, src, count, COPY_USER);
return 0;
}
static int emu8k_pcm_copy_kernel(struct snd_pcm_substream *subs,
int voice, unsigned long pos,
void *src, unsigned long count)
{
struct snd_emu8k_pcm *rec = subs->runtime->private_data;
/* convert to frames */
pos = bytes_to_frames(subs->runtime, pos);
count = bytes_to_frames(subs->runtime, count);
LOOP_WRITE(rec, pos, src, count, COPY_KERNEL);
LOOP_WRITE(rec, pos, src, count);
return 0;
}
@ -550,7 +509,7 @@ static int emu8k_pcm_silence(struct snd_pcm_substream *subs,
/* convert to frames */
pos = bytes_to_frames(subs->runtime, pos);
count = bytes_to_frames(subs->runtime, count);
LOOP_WRITE(rec, pos, NULL, count, FILL_SILENCE);
LOOP_WRITE(rec, pos, NULL, count);
return 0;
}
#endif
@ -666,8 +625,7 @@ static const struct snd_pcm_ops emu8k_pcm_ops = {
.prepare = emu8k_pcm_prepare,
.trigger = emu8k_pcm_trigger,
.pointer = emu8k_pcm_pointer,
.copy_user = emu8k_pcm_copy,
.copy_kernel = emu8k_pcm_copy_kernel,
.copy = emu8k_pcm_copy,
.fill_silence = emu8k_pcm_silence,
};