linux-kernel - [PATCH 39/40] hwmon: (lm90) Add table with supported Analog/ONSEMI devices

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Date:   Wed, 25 May 2022 06:57:57 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     linux-hwmon@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Jean Delvare <jdelvare@...e.com>,
        Slawomir Stepien <sst@...zta.fm>,
        Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH 39/40] hwmon: (lm90) Add table with supported Analog/ONSEMI devices

Add table with device names and known register values for supported
devices from Analog / ON Semiconductor.

Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 drivers/hwmon/lm90.c | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
index 77102e0a4440..7f8397c362e8 100644
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -1828,6 +1828,42 @@ static const char *lm90_detect_analog(struct i2c_client *client, bool common_add
 	if (status < 0 || config2 < 0 || man_id2 < 0 || chip_id2 < 0)
 		return NULL;
 
+	/*
+	 * The following chips should be detected by this function. Known
+	 * register values are listed. Registers 0x3d .. 0x3e are undocumented
+	 * for most of the chips, yet appear to return a well defined value.
+	 * Register 0xff is undocumented for some of the chips. Register 0x3f
+	 * is undocumented for all chips, but also returns a well defined value.
+	 * Values are as reported from real chips unless mentioned otherwise.
+	 * The code below checks values for registers 0x3d, 0x3e, and 0xff,
+	 * but not for register 0x3f.
+	 *
+	 * Chip			Register
+	 *		3d	3e	3f	fe	ff	Notes
+	 * ----------------------------------------------------------
+	 * adm1020	00	00	00	41	39
+	 * adm1021	00	00	00	41	03
+	 * adm1021a	00	00	00	41	3c
+	 * adm1023	00	00	00	41	3c	same as adm1021a
+	 * adm1032	00	00	00	41	42
+	 *
+	 * adt7421	21	41	04	41	04
+	 * adt7461	00	00	00	41	51
+	 * adt7461a	61	41	05	41	57
+	 * adt7481	81	41	02	41	62
+	 * adt7482	-	-	-	41	65	datasheet
+	 *		82	41	05	41	75	real chip
+	 * adt7483	83	41	04	41	94
+	 *
+	 * nct72	61	41	07	41	55
+	 * nct210	00	00	00	41	3f
+	 * nct214	61	41	08	41	5a
+	 * nct1008	-	-	-	41	57	datasheet rev. 3
+	 *		61	41	06	41	54	real chip
+	 *
+	 * nvt210	-	-	-	41	-	datasheet
+	 * nvt211	-	-	-	41	-	datasheet
+	 */
 	switch (chip_id) {
 	case 0x00 ... 0x03:	/* ADM1021 */
 	case 0x05 ... 0x0f:
-- 
2.35.1