linux-kernel - [RFC PATCH 2/2] i2c: mux: pca954x: Use API function to verify device ID

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Date:   Mon, 19 Mar 2018 09:10:59 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Peter Rosin <peda@...ntia.se>
Cc:     Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>
Subject: [RFC PATCH 2/2] i2c: mux: pca954x: Use API function to verify device ID

Use i2c_verify_device_id() to verify the device ID in the probe function.

Cc: Peter Rosin <peda@...ntia.se>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
RFC: Compile tested only

 drivers/i2c/muxes/i2c-mux-pca954x.c | 24 +++++++-----------------
 1 file changed, 7 insertions(+), 17 deletions(-)

diff --git a/drivers/i2c/muxes/i2c-mux-pca954x.c b/drivers/i2c/muxes/i2c-mux-pca954x.c
index 09bafd3e68fa..80b7db26b02a 100644
--- a/drivers/i2c/muxes/i2c-mux-pca954x.c
+++ b/drivers/i2c/muxes/i2c-mux-pca954x.c
@@ -148,6 +148,7 @@ static const struct chip_desc chips[] = {
 		.id = {
 			.manufacturer_id = I2C_DEVICE_ID_NXP_SEMICONDUCTORS,
 			.part_id = 0x10b,
+			.die_revision = I2C_DEVICE_DIE_REVISION_ANY,
 		},
 	},
 	[pca_9847] = {
@@ -157,6 +158,7 @@ static const struct chip_desc chips[] = {
 		.id = {
 			.manufacturer_id = I2C_DEVICE_ID_NXP_SEMICONDUCTORS,
 			.part_id = 0x108,
+			.die_revision = I2C_DEVICE_DIE_REVISION_ANY,
 		},
 	},
 	[pca_9848] = {
@@ -165,6 +167,7 @@ static const struct chip_desc chips[] = {
 		.id = {
 			.manufacturer_id = I2C_DEVICE_ID_NXP_SEMICONDUCTORS,
 			.part_id = 0x10a,
+			.die_revision = I2C_DEVICE_DIE_REVISION_ANY,
 		},
 	},
 	[pca_9849] = {
@@ -174,6 +177,7 @@ static const struct chip_desc chips[] = {
 		.id = {
 			.manufacturer_id = I2C_DEVICE_ID_NXP_SEMICONDUCTORS,
 			.part_id = 0x109,
+			.die_revision = I2C_DEVICE_DIE_REVISION_ANY,
 		},
 	},
 };
@@ -400,23 +404,9 @@ static int pca954x_probe(struct i2c_client *client,
 	else
 		data->chip = &chips[id->driver_data];
 
-	if (data->chip->id.manufacturer_id != I2C_DEVICE_ID_NONE) {
-		struct i2c_device_identity id;
-
-		ret = i2c_get_device_id(client, &id);
-		if (ret && ret != -EOPNOTSUPP)
-			return ret;
-
-		if (!ret &&
-		    (id.manufacturer_id != data->chip->id.manufacturer_id ||
-		     id.part_id != data->chip->id.part_id)) {
-			dev_warn(&client->dev,
-				 "unexpected device id %03x-%03x-%x\n",
-				 id.manufacturer_id, id.part_id,
-				 id.die_revision);
-			return -ENODEV;
-		}
-	}
+	ret = i2c_verify_device_id(client, &data->chip->id);
+	if (ret < 0 && ret != -EOPNOTSUPP)
+		return ret;
 
 	/* Write the mux register at addr to verify
 	 * that the mux is in fact present. This also
-- 
2.7.4