linux-kernel - [PATCH] tpm: cr50: Add new device/vendor ID 0x504a6666

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Date:   Tue,  5 Apr 2022 10:37:41 -0700
From:   "Jes B. Klinke" <jbk@...omium.org>
To:     linux-integrity@...r.kernel.org
Cc:     Paul Menzel <pmenzel@...gen.mpg.de>,
        "Jes B. Klinke" <jbk@...omium.org>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Peter Huewe <peterhuewe@....de>, linux-kernel@...r.kernel.org
Subject: [PATCH] tpm: cr50: Add new device/vendor ID 0x504a6666

Accept one additional numerical value of DID:VID for next generation
Google TPM, to be used in future Chromebooks.

This patch touches more lines than may seem necessary, as a result of
the need to move the error case to sit after the two recognized cases.

Signed-off-by: Jes B. Klinke <jbk@...omium.org>
---

 drivers/char/tpm/tpm_tis_i2c_cr50.c | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/drivers/char/tpm/tpm_tis_i2c_cr50.c b/drivers/char/tpm/tpm_tis_i2c_cr50.c
index f6c0affbb4567..bf54ebd6724b0 100644
--- a/drivers/char/tpm/tpm_tis_i2c_cr50.c
+++ b/drivers/char/tpm/tpm_tis_i2c_cr50.c
@@ -31,6 +31,7 @@
 #define TPM_CR50_TIMEOUT_SHORT_MS	2		/* Short timeout during transactions */
 #define TPM_CR50_TIMEOUT_NOIRQ_MS	20		/* Timeout for TPM ready without IRQ */
 #define TPM_CR50_I2C_DID_VID		0x00281ae0L	/* Device and vendor ID reg value */
+#define TPM_TI50_I2C_DID_VID		0x504a6666L	/* Device and vendor ID reg value */
 #define TPM_CR50_I2C_MAX_RETRIES	3		/* Max retries due to I2C errors */
 #define TPM_CR50_I2C_RETRY_DELAY_LO	55		/* Min usecs between retries on I2C */
 #define TPM_CR50_I2C_RETRY_DELAY_HI	65		/* Max usecs between retries on I2C */
@@ -742,16 +743,20 @@ static int tpm_cr50_i2c_probe(struct i2c_client *client)
 	}
 
 	vendor = le32_to_cpup((__le32 *)buf);
-	if (vendor != TPM_CR50_I2C_DID_VID) {
-		dev_err(dev, "Vendor ID did not match! ID was %08x\n", vendor);
-		tpm_cr50_release_locality(chip, true);
-		return -ENODEV;
+	if (vendor == TPM_CR50_I2C_DID_VID) {
+		dev_info(dev, "cr50 TPM 2.0 (i2c 0x%02x irq %d id 0x%x)\n",
+			 client->addr, client->irq, vendor >> 16);
+		return tpm_chip_register(chip);
+	}
+	if (vendor == TPM_TI50_I2C_DID_VID) {
+		dev_info(dev, "ti50 TPM 2.0 (i2c 0x%02x irq %d id 0x%x)\n",
+			 client->addr, client->irq, vendor >> 16);
+		return tpm_chip_register(chip);
 	}
 
-	dev_info(dev, "cr50 TPM 2.0 (i2c 0x%02x irq %d id 0x%x)\n",
-		 client->addr, client->irq, vendor >> 16);
-
-	return tpm_chip_register(chip);
+	dev_err(dev, "Vendor ID did not match! ID was %08x\n", vendor);
+	tpm_cr50_release_locality(chip, true);
+	return -ENODEV;
 }
 
 /**
-- 
2.35.1.1094.g7c7d902a7c-goog