snd-pcsp: put back the compatibility code for the older alsa-libs

The attached patch adds back the compatibility code, allowing the
driver to work with older alsa-libs.
The removal was premature, it breaks the real-life configs.

Signed-off-by: Stas Sergeev <stsp@aknet.ru>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 14 insertions, 5 deletions

diff --git a/sound/drivers/pcsp/pcsp_lib.c b/sound/drivers/pcsp/pcsp_lib.c
index ac6238e93513..54253e9b4b02 100644
--- a/sound/drivers/pcsp/pcsp_lib.c
+++ b/sound/drivers/pcsp/pcsp_lib.c
@@ -18,6 +18,8 @@ module_param(nforce_wa, bool, 0444);
 MODULE_PARM_DESC(nforce_wa, "Apply NForce chipset workaround "
                 "(expect bad sound)");
 
+#define DMIX_WANTS_S16  1
+
 static void pcsp_start_timer(unsigned long dummy)
 {
         hrtimer_start(&pcsp_chip.timer, ktime_set(0, 0), HRTIMER_MODE_REL);
@@ -47,7 +49,7 @@ enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle)
 {
         unsigned long flags;
         unsigned char timer_cnt, val;
-        int periods_elapsed;
+        int fmt_size, periods_elapsed;
         u64 ns;
         size_t period_bytes, buffer_bytes;
         struct snd_pcm_substream *substream;
@@ -92,8 +94,11 @@ enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle)
                 goto exit_nr_unlock2;
 
         runtime = substream->runtime;
-        /* assume it is u8 mono */
-        val = runtime->dma_area[chip->playback_ptr];
+        fmt_size = snd_pcm_format_physical_width(runtime->format) >> 3;
+        /* assume it is mono! */
+        val = runtime->dma_area[chip->playback_ptr + fmt_size - 1];
+        if (snd_pcm_format_signed(runtime->format))
+                val ^= 0x80;
         timer_cnt = val * CUR_DIV() / 256;
 
         if (timer_cnt && chip->enable) {
@@ -111,7 +116,7 @@ enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle)
 
         period_bytes = snd_pcm_lib_period_bytes(substream);
         buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
-        chip->playback_ptr += PCSP_INDEX_INC();
+        chip->playback_ptr += PCSP_INDEX_INC() * fmt_size;
         periods_elapsed = chip->playback_ptr - chip->period_ptr;
         if (periods_elapsed < 0) {
                 printk(KERN_WARNING "PCSP: playback_ptr inconsistent "
@@ -270,7 +275,11 @@ static struct snd_pcm_hardware snd_pcsp_playback = {
         .info = (SNDRV_PCM_INFO_INTERLEAVED |
                  SNDRV_PCM_INFO_HALF_DUPLEX |
                  SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID),
-        .formats = SNDRV_PCM_FMTBIT_U8,
+        .formats = (SNDRV_PCM_FMTBIT_U8
+#if DMIX_WANTS_S16
+                    | SNDRV_PCM_FMTBIT_S16_LE
+#endif
+            ),
         .rates = SNDRV_PCM_RATE_KNOT,
         .rate_min = PCSP_DEFAULT_SRATE,
         .rate_max = PCSP_DEFAULT_SRATE,