[PATCH v4] tpm: Add new device/vendor ID 0x50666666
From: Jett Rink <hidden>
Date: 2024-08-02 21:10:01
Also in:
linux-security-module, lkml
Subsystem:
the rest, tpm device driver · Maintainers:
Linus Torvalds, Peter Huewe, Jarkko Sakkinen
Accept another DID:VID for the next generation Google TPM. This TPM has the same Ti50 firmware and fulfills the same interface. Suggested-by: jarkko@kernel.org Signed-off-by: Jett Rink <redacted> --- Changes in v4: Add Suggested-by tag. Sorry that I forget. Changes in v3: Refactor ternary operators into helper method. Changes in v2: Patchset 2 applies cleanly drivers/char/tpm/tpm_tis_i2c_cr50.c | 30 ++++++++++++++++++++++++++--- 1 file changed, 27 insertions(+), 3 deletions(-)
diff --git a/drivers/char/tpm/tpm_tis_i2c_cr50.c b/drivers/char/tpm/tpm_tis_i2c_cr50.c
index adf22992138e..1f83cfe2724c 100644
--- a/drivers/char/tpm/tpm_tis_i2c_cr50.c
+++ b/drivers/char/tpm/tpm_tis_i2c_cr50.c@@ -31,7 +31,8 @@ #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_TI50_DT_I2C_DID_VID 0x504a6666L /* Device and vendor ID reg value */ +#define TPM_TI50_OT_I2C_DID_VID 0x50666666L /* 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 */
@@ -668,6 +669,27 @@ static const struct of_device_id of_cr50_i2c_match[] = { MODULE_DEVICE_TABLE(of, of_cr50_i2c_match); #endif +/** + * tpm_cr50_vid_to_name() - Maps VID to name. + * @vendor: Vendor identifier to map to name + * + * Return: + * A valid string for the vendor or empty string + */ +static const char *tpm_cr50_vid_to_name(u32 vendor) +{ + switch (vendor) { + case TPM_CR50_I2C_DID_VID: + return "cr50"; + case TPM_TI50_DT_I2C_DID_VID: + return "ti50 DT"; + case TPM_TI50_OT_I2C_DID_VID: + return "ti50 OT"; + default: + return ""; + } +} + /** * tpm_cr50_i2c_probe() - Driver probe function. * @client: I2C client information.
@@ -741,14 +763,16 @@ static int tpm_cr50_i2c_probe(struct i2c_client *client) } vendor = le32_to_cpup((__le32 *)buf); - if (vendor != TPM_CR50_I2C_DID_VID && vendor != TPM_TI50_I2C_DID_VID) { + if (vendor != TPM_CR50_I2C_DID_VID && + vendor != TPM_TI50_DT_I2C_DID_VID && + vendor != TPM_TI50_OT_I2C_DID_VID) { dev_err(dev, "Vendor ID did not match! ID was %08x\n", vendor); tpm_cr50_release_locality(chip, true); return -ENODEV; } dev_info(dev, "%s TPM 2.0 (i2c 0x%02x irq %d id 0x%x)\n", - vendor == TPM_TI50_I2C_DID_VID ? "ti50" : "cr50", + tpm_cr50_vid_to_name(vendor), client->addr, client->irq, vendor >> 16); return tpm_chip_register(chip); }
--
2.46.0.rc2.264.g509ed76dc8-goog