ALSA: snd-pcsp: add nopcm mode

Currently, if the high-res timers are unavailable, snd-pcsp does not
initialize. People who choose it over pcspkr, loose their console beeps
in that case and get annoyed.
With this patch, the console beeps remain regardless of the high-res
timers. Additionally, the "nopcm" modparam is added to forcibly
disable the PCM capabilities of the driver.

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

1 files changed, 20 insertions, 12 deletions

diff --git a/sound/drivers/pcsp/pcsp.c b/sound/drivers/pcsp/pcsp.c
index b60cef257b5..f165c77d627 100644
--- a/sound/drivers/pcsp/pcsp.c
+++ b/sound/drivers/pcsp/pcsp.c
@@ -26,6 +26,7 @@ MODULE_ALIAS("platform:pcspkr");
 static int index = SNDRV_DEFAULT_IDX1;	/* Index 0-MAX */
 static char *id = SNDRV_DEFAULT_STR1;	/* ID for this card */
 static int enable = SNDRV_DEFAULT_ENABLE1;	/* Enable this card */
+static int nopcm;	/* Disable PCM capability of the driver */
 
 module_param(index, int, 0444);
 MODULE_PARM_DESC(index, "Index value for pcsp soundcard.");
@@ -33,6 +34,8 @@ module_param(id, charp, 0444);
 MODULE_PARM_DESC(id, "ID string for pcsp soundcard.");
 module_param(enable, bool, 0444);
 MODULE_PARM_DESC(enable, "Enable PC-Speaker sound.");
+module_param(nopcm, bool, 0444);
+MODULE_PARM_DESC(nopcm, "Disable PC-Speaker PCM sound. Only beeps remain.");
 
 struct snd_pcsp pcsp_chip;
 
@@ -43,13 +46,16 @@ static int __devinit snd_pcsp_create(struct snd_card *card)
 	int err;
 	int div, min_div, order;
 
-	hrtimer_get_res(CLOCK_MONOTONIC, &tp);
-	if (tp.tv_sec || tp.tv_nsec > PCSP_MAX_PERIOD_NS) {
-		printk(KERN_ERR "PCSP: Timer resolution is not sufficient "
-		       "(%linS)\n", tp.tv_nsec);
-		printk(KERN_ERR "PCSP: Make sure you have HPET and ACPI "
-		       "enabled.\n");
-		return -EIO;
+	if (!nopcm) {
+		hrtimer_get_res(CLOCK_MONOTONIC, &tp);
+		if (tp.tv_sec || tp.tv_nsec > PCSP_MAX_PERIOD_NS) {
+			printk(KERN_ERR "PCSP: Timer resolution is not sufficient "
+				"(%linS)\n", tp.tv_nsec);
+			printk(KERN_ERR "PCSP: Make sure you have HPET and ACPI "
+				"enabled.\n");
+			printk(KERN_ERR "PCSP: Turned into nopcm mode.\n");
+			nopcm = 1;
+		}
 	}
 
 	if (loops_per_jiffy >= PCSP_MIN_LPJ && tp.tv_nsec <= PCSP_MIN_PERIOD_NS)
@@ -107,12 +113,14 @@ static int __devinit snd_card_pcsp_probe(int devnum, struct device *dev)
 		snd_card_free(card);
 		return err;
 	}
-	err = snd_pcsp_new_pcm(&pcsp_chip);
-	if (err < 0) {
-		snd_card_free(card);
-		return err;
+	if (!nopcm) {
+		err = snd_pcsp_new_pcm(&pcsp_chip);
+		if (err < 0) {
+			snd_card_free(card);
+			return err;
+		}
 	}
-	err = snd_pcsp_new_mixer(&pcsp_chip);
+	err = snd_pcsp_new_mixer(&pcsp_chip, nopcm);
 	if (err < 0) {
 		snd_card_free(card);
 		return err;