linux-kernel - [PATCH 12/27] ASoC: tas2764: Export 'die

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Message-Id: <20250215-apple-codec-changes-v1-12-723569b21b19@gmail.com>
Date: Sat, 15 Feb 2025 10:02:45 +1000
From: James Calligeros <jcalligeros99@...il.com>
To: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, 
 Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>, 
 Shenghao Ding <shenghao-ding@...com>, Kevin Lu <kevin-lu@...com>, 
 Baojun Xu <baojun.xu@...com>, Dan Murphy <dmurphy@...com>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Shi Fu <shifu0704@...ndersoft.com>
Cc: Alyssa Rosenzweig <alyssa@...enzweig.io>, 
 Martin Povišer <povik+lin@...ebit.org>, 
 Hector Martin <marcan@...can.st>, linux-sound@...r.kernel.org, 
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
 asahi@...ts.linux.dev, James Calligeros <jcalligeros99@...il.com>
Subject: [PATCH 12/27] ASoC: tas2764: Export 'die_temp' to sysfs

From: Martin Povišer <povik+lin@...ebit.org>

Export a file for the readout of die temperature measurements.
As per the datasheet, the temperature can be calculated by
subtracting the value in the register by 93.

Signed-off-by: Martin Povišer <povik+lin@...ebit.org>
Signed-off-by: James Calligeros <jcalligeros99@...il.com>
---
 sound/soc/codecs/tas2764.c | 45 +++++++++++++++++++++++++
 sound/soc/codecs/tas2764.h |  3 ++
 2 files changed, 48 insertions(+)

diff --git a/sound/soc/codecs/tas2764.c b/sound/soc/codecs/tas2764.c
index e32ac441cf3cfc8fd8c6a1839c68e84ac9347150..25238d3721a21d5af8434490acfdb7ba53de9ce0 100644
--- a/sound/soc/codecs/tas2764.c
+++ b/sound/soc/codecs/tas2764.c
@@ -16,6 +16,7 @@
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/slab.h>
+#include <linux/sysfs.h>
 #include <sound/soc.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
@@ -571,6 +572,39 @@ static int tas2764_apply_init_quirks(struct tas2764_priv *tas2764)
 	return 0;
 }
 
+static int tas2764_read_die_temp(struct tas2764_priv *tas2764, int *result)
+{
+	int ret;
+
+	ret = snd_soc_component_read(tas2764->component, TAS2764_TEMP);
+	if (ret < 0)
+		return ret;
+	*result = ret - 93;
+	return 0;
+}
+
+static ssize_t die_temp_show(struct device *dev,
+			 struct device_attribute *attr, char *buf)
+{
+	struct tas2764_priv *tas2764 = i2c_get_clientdata(to_i2c_client(dev));
+	int ret, temp;
+
+	ret = tas2764_read_die_temp(tas2764, &temp);
+
+	if (ret < 0)
+		return ret;
+
+	return sysfs_emit(buf, "%d C\n", temp);
+}
+
+static DEVICE_ATTR_RO(die_temp);
+
+static struct attribute *tas2764_sysfs_attrs[] = {
+	&dev_attr_die_temp.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(tas2764_sysfs);
+
 static int tas2764_codec_probe(struct snd_soc_component *component)
 {
 	struct tas2764_priv *tas2764 = snd_soc_component_get_drvdata(component);
@@ -664,9 +698,19 @@ static int tas2764_codec_probe(struct snd_soc_component *component)
 			return ret;
 	}
 
+	ret = sysfs_create_groups(&component->dev->kobj, tas2764_sysfs_groups);
+
+	if (ret < 0)
+		return ret;
+
 	return 0;
 }
 
+static void tas2764_codec_remove(struct snd_soc_component *component)
+{
+	sysfs_remove_groups(&component->dev->kobj, tas2764_sysfs_groups);
+}
+
 static DECLARE_TLV_DB_SCALE(tas2764_digital_tlv, 1100, 50, 0);
 static DECLARE_TLV_DB_SCALE(tas2764_playback_volume, -10050, 50, 1);
 
@@ -698,6 +742,7 @@ static const struct snd_kcontrol_new tas2764_snd_controls[] = {
 
 static const struct snd_soc_component_driver soc_component_driver_tas2764 = {
 	.probe			= tas2764_codec_probe,
+	.remove			= tas2764_codec_remove,
 	.suspend		= tas2764_codec_suspend,
 	.resume			= tas2764_codec_resume,
 	.controls		= tas2764_snd_controls,
diff --git a/sound/soc/codecs/tas2764.h b/sound/soc/codecs/tas2764.h
index 10ef7d4a490e1dec3ba9c824479a6d35ac57f33e..dbe3f7fa90187919b017eb2d59a67cfffc222735 100644
--- a/sound/soc/codecs/tas2764.h
+++ b/sound/soc/codecs/tas2764.h
@@ -111,6 +111,9 @@
 #define TAS2764_INT_LTCH3               TAS2764_REG(0x0, 0x50)
 #define TAS2764_INT_LTCH4               TAS2764_REG(0x0, 0x51)
 
+/* Readout Registers */
+#define TAS2764_TEMP                    TAS2764_REG(0x0, 0x56)
+
 /* Clock/IRQ Settings */
 #define TAS2764_INT_CLK_CFG             TAS2764_REG(0x0, 0x5c)
 #define TAS2764_INT_CLK_CFG_IRQZ_CLR    BIT(2)

-- 
2.48.1