[SRU][Focal][PATCH 3/4] ASoC: SOF: acpi led support for switch controls

[Hui Wang]

From: Jaska Uimonen <jaska.uimonen at linux.intel.com>

BugLink: https://bugs.launchpad.net/bugs/1864398

Currently sof doesn't support acpi leds with mute switches. So implement
acpi leds following quite shamelessly existing HDA implementation by
Takashi Iwai.

Mute leds can be enabled in topology by adding led and direction token
in switch control private data.

Signed-off-by: Jaska Uimonen <jaska.uimonen at linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
Link: https://lore.kernel.org/r/20191008164443.1358-10-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie at kernel.org>
(cherry picked from commit 5d43001ae43606dc525f55c482c545afba01bb55)
Signed-off-by: Hui Wang <hui.wang at canonical.com>
---
 include/uapi/sound/sof/tokens.h |  4 ++++
 sound/soc/sof/control.c         | 32 ++++++++++++++++++++++++++++++++
 sound/soc/sof/sof-priv.h        |  9 +++++++++
 sound/soc/sof/topology.c        | 13 +++++++++++++
 4 files changed, 58 insertions(+)

diff --git a/include/uapi/sound/sof/tokens.h b/include/uapi/sound/sof/tokens.h
index 8f996857fb24..28ef01a67765 100644
--- a/include/uapi/sound/sof/tokens.h
+++ b/include/uapi/sound/sof/tokens.h
@@ -114,4 +114,8 @@
 #define SOF_TKN_IMX_ESAI_FIRST_TOKEN		1100
 /* TODO: Add ESAI tokens */
 
+/* Led control for mute switches */
+#define SOF_TKN_MUTE_LED_USE			1300
+#define SOF_TKN_MUTE_LED_DIRECTION		1301
+
 #endif
diff --git a/sound/soc/sof/control.c b/sound/soc/sof/control.c
index 2b8711eda362..b73d4587c5da 100644
--- a/sound/soc/sof/control.c
+++ b/sound/soc/sof/control.c
@@ -11,8 +11,37 @@
 /* Mixer Controls */
 
 #include <linux/pm_runtime.h>
+#include <linux/leds.h>
 #include "sof-priv.h"
 
+static void update_mute_led(struct snd_sof_control *scontrol,
+			    struct snd_kcontrol *kcontrol,
+			    struct snd_ctl_elem_value *ucontrol)
+{
+	unsigned int temp = 0;
+	unsigned int mask;
+	int i;
+
+	mask = 1U << snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
+
+	for (i = 0; i < scontrol->num_channels; i++) {
+		if (ucontrol->value.integer.value[i]) {
+			temp |= mask;
+			break;
+		}
+	}
+
+	if (temp == scontrol->led_ctl.led_value)
+		return;
+
+	scontrol->led_ctl.led_value = temp;
+
+	if (!scontrol->led_ctl.direction)
+		ledtrig_audio_set(LED_AUDIO_MUTE, temp ? LED_OFF : LED_ON);
+	else
+		ledtrig_audio_set(LED_AUDIO_MICMUTE, temp ? LED_OFF : LED_ON);
+}
+
 static inline u32 mixer_to_ipc(unsigned int value, u32 *volume_map, int size)
 {
 	if (value >= size)
@@ -118,6 +147,9 @@ int snd_sof_switch_put(struct snd_kcontrol *kcontrol,
 		cdata->chanv[i].value = value;
 	}
 
+	if (scontrol->led_ctl.use_led)
+		update_mute_led(scontrol, kcontrol, ucontrol);
+
 	/* notify DSP of mixer updates */
 	if (pm_runtime_active(sdev->dev))
 		snd_sof_ipc_set_get_comp_data(sdev->ipc, scontrol,
diff --git a/sound/soc/sof/sof-priv.h b/sound/soc/sof/sof-priv.h
index 7b329bd99674..b8c30c0a22e3 100644
--- a/sound/soc/sof/sof-priv.h
+++ b/sound/soc/sof/sof-priv.h
@@ -15,6 +15,7 @@
 
 #include <sound/hdaudio.h>
 #include <sound/soc.h>
+#include <sound/control.h>
 
 #include <sound/sof.h>
 #include <sound/sof/stream.h> /* needs to be included before control.h */
@@ -305,6 +306,12 @@ struct snd_sof_pcm {
 	bool prepared[2]; /* PCM_PARAMS set successfully */
 };
 
+struct snd_sof_led_control {
+	unsigned int use_led;
+	unsigned int direction;
+	unsigned int led_value;
+};
+
 /* ALSA SOF Kcontrol device */
 struct snd_sof_control {
 	struct snd_sof_dev *sdev;
@@ -319,6 +326,8 @@ struct snd_sof_control {
 	u32 *volume_table; /* volume table computed from tlv data*/
 
 	struct list_head list;	/* list in sdev control list */
+
+	struct snd_sof_led_control led_ctl;
 };
 
 /* ASoC SOF DAPM widget */
diff --git a/sound/soc/sof/topology.c b/sound/soc/sof/topology.c
index 51db93e0e9cd..76e126b533a8 100644
--- a/sound/soc/sof/topology.c
+++ b/sound/soc/sof/topology.c
@@ -682,6 +682,14 @@ static const struct sof_topology_token dmic_pdm_tokens[] = {
 static const struct sof_topology_token hda_tokens[] = {
 };
 
+/* Leds */
+static const struct sof_topology_token led_tokens[] = {
+	{SOF_TKN_MUTE_LED_USE, SND_SOC_TPLG_TUPLE_TYPE_WORD, get_token_u32,
+	 offsetof(struct snd_sof_led_control, use_led), 0},
+	{SOF_TKN_MUTE_LED_DIRECTION, SND_SOC_TPLG_TUPLE_TYPE_WORD,
+	 get_token_u32, offsetof(struct snd_sof_led_control, direction), 0},
+};
+
 static void sof_parse_uuid_tokens(struct snd_soc_component *scomp,
 				  void *object,
 				  const struct sof_topology_token *tokens,
@@ -944,6 +952,11 @@ static int sof_control_load_volume(struct snd_soc_component *scomp,
 	}
 
 out:
+	/* set up possible led control from mixer private data */
+	ret = sof_parse_tokens(scomp, &scontrol->led_ctl, led_tokens,
+			       ARRAY_SIZE(led_tokens), mc->priv.array,
+			       le32_to_cpu(mc->priv.size));
+
 	dev_dbg(sdev->dev, "tplg: load kcontrol index %d chans %d\n",
 		scontrol->comp_id, scontrol->num_channels);
 
-- 
2.17.1