Merge tag 'mute-led-rework' of https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound into asoc-5.13

ALSA: control - add generic LED API

This patchset tries to resolve the diversity in the audio LED
control among the ALSA drivers. A new control layer registration
is introduced which allows to run additional operations on
top of the elementary ALSA sound controls.

A new control access group (three bits in the access flags)
was introduced to carry the LED group information for
the sound controls. The low-level sound drivers can just
mark those controls using this access group. This information
is not exported to the user space, but user space can
manage the LED sound control associations through sysfs
(last patch) per Mark's request. It makes things fully
configurable in the kernel and user space (UCM).

The actual state ('route') evaluation is really easy
(the minimal value check for all channels / controls / cards).
If there's more complicated logic for a given hardware,
the card driver may eventually export a new read-only
sound control for the LED group and do the logic itself.

The new LED trigger control code is completely separated
and possibly optional (there's no symbol dependency).
The full code separation allows eventually to move this
LED trigger control to the user space in future.
Actually it replaces the already present functionality
in the kernel space (HDA drivers) and allows a quick adoption
for the recent hardware (ASoC codecs including SoundWire).

snd_ctl_led            24576  0

The sound driver implementation is really easy:

1) call snd_ctl_led_request() when control LED layer should be
   automatically activated
   / it calls module_request("snd-ctl-led") on demand /
2) mark all related kcontrols with
        SNDRV_CTL_ELEM_ACCESS_SPK_LED or
        SNDRV_CTL_ELEM_ACCESS_MIC_LED

Link: https://lore.kernel.org/r/20210317172945.842280-1-perex@perex.cz
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 11 insertions, 8 deletions

diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c
index ee558675eab4..994f1b8e3504 100644
--- a/drivers/scsi/sd_zbc.c
+++ b/drivers/scsi/sd_zbc.c
@@ -280,27 +280,28 @@ static int sd_zbc_update_wp_offset_cb(struct blk_zone *zone, unsigned int idx,
 static void sd_zbc_update_wp_offset_workfn(struct work_struct *work)
 {
 	struct scsi_disk *sdkp;
+	unsigned long flags;
 	unsigned int zno;
 	int ret;
 
 	sdkp = container_of(work, struct scsi_disk, zone_wp_offset_work);
 
-	spin_lock_bh(&sdkp->zones_wp_offset_lock);
+	spin_lock_irqsave(&sdkp->zones_wp_offset_lock, flags);
 	for (zno = 0; zno < sdkp->nr_zones; zno++) {
 		if (sdkp->zones_wp_offset[zno] != SD_ZBC_UPDATING_WP_OFST)
 			continue;
 
-		spin_unlock_bh(&sdkp->zones_wp_offset_lock);
+		spin_unlock_irqrestore(&sdkp->zones_wp_offset_lock, flags);
 		ret = sd_zbc_do_report_zones(sdkp, sdkp->zone_wp_update_buf,
 					     SD_BUF_SIZE,
 					     zno * sdkp->zone_blocks, true);
-		spin_lock_bh(&sdkp->zones_wp_offset_lock);
+		spin_lock_irqsave(&sdkp->zones_wp_offset_lock, flags);
 		if (!ret)
 			sd_zbc_parse_report(sdkp, sdkp->zone_wp_update_buf + 64,
 					    zno, sd_zbc_update_wp_offset_cb,
 					    sdkp);
 	}
-	spin_unlock_bh(&sdkp->zones_wp_offset_lock);
+	spin_unlock_irqrestore(&sdkp->zones_wp_offset_lock, flags);
 
 	scsi_device_put(sdkp->device);
 }
@@ -324,6 +325,7 @@ blk_status_t sd_zbc_prepare_zone_append(struct scsi_cmnd *cmd, sector_t *lba,
 	struct request *rq = cmd->request;
 	struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
 	unsigned int wp_offset, zno = blk_rq_zone_no(rq);
+	unsigned long flags;
 	blk_status_t ret;
 
 	ret = sd_zbc_cmnd_checks(cmd);
@@ -337,7 +339,7 @@ blk_status_t sd_zbc_prepare_zone_append(struct scsi_cmnd *cmd, sector_t *lba,
 	if (!blk_req_zone_write_trylock(rq))
 		return BLK_STS_ZONE_RESOURCE;
 
-	spin_lock_bh(&sdkp->zones_wp_offset_lock);
+	spin_lock_irqsave(&sdkp->zones_wp_offset_lock, flags);
 	wp_offset = sdkp->zones_wp_offset[zno];
 	switch (wp_offset) {
 	case SD_ZBC_INVALID_WP_OFST:
@@ -366,7 +368,7 @@ blk_status_t sd_zbc_prepare_zone_append(struct scsi_cmnd *cmd, sector_t *lba,
 
 		*lba += wp_offset;
 	}
-	spin_unlock_bh(&sdkp->zones_wp_offset_lock);
+	spin_unlock_irqrestore(&sdkp->zones_wp_offset_lock, flags);
 	if (ret)
 		blk_req_zone_write_unlock(rq);
 	return ret;
@@ -445,6 +447,7 @@ static unsigned int sd_zbc_zone_wp_update(struct scsi_cmnd *cmd,
 	struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
 	unsigned int zno = blk_rq_zone_no(rq);
 	enum req_opf op = req_op(rq);
+	unsigned long flags;
 
 	/*
 	 * If we got an error for a command that needs updating the write
@@ -452,7 +455,7 @@ static unsigned int sd_zbc_zone_wp_update(struct scsi_cmnd *cmd,
 	 * invalid to force an update from disk the next time a zone append
 	 * command is issued.
 	 */
-	spin_lock_bh(&sdkp->zones_wp_offset_lock);
+	spin_lock_irqsave(&sdkp->zones_wp_offset_lock, flags);
 
 	if (result && op != REQ_OP_ZONE_RESET_ALL) {
 		if (op == REQ_OP_ZONE_APPEND) {
@@ -496,7 +499,7 @@ static unsigned int sd_zbc_zone_wp_update(struct scsi_cmnd *cmd,
 	}
 
 unlock_wp_offset:
-	spin_unlock_bh(&sdkp->zones_wp_offset_lock);
+	spin_unlock_irqrestore(&sdkp->zones_wp_offset_lock, flags);
 
 	return good_bytes;
 }