platform/x86: thinkpad_acpi: Fix USB-C Security probe failure on unsupported platforms

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On systems where the USCS ACPI method is absent, acpi_evalf() returns
AE_NOT_FOUND which maps to -EIO. This caused tpacpi_usbc_security_init()
to propagate the error and thinkpad_acpi failed to probe entirely on
unsupported platforms.

Fix this by checking for USCS method presence with acpi_has_method() before
attempting to call it, returning -ENODEV immediately if absent.
This follows the same pattern used by other subdrivers in thinkpad_acpi.c.

Fixes: 67e8d1e9cacd ("platform/x86: thinkpad_acpi: Add USB-C Security (USCS) support")
Reported-by: Oliver Lin <oliver@liuxiaozhen.dev>
Closes: https://lore.kernel.org/platform-driver-x86/239c8162-e1e6-4b49-8292-35547c5a525c@liuxiaozhen.dev/
Tested-by: Oliver Lin <oliver@liuxiaozhen.dev>
Signed-off-by: Vishnu Sankar <vishnuocv@gmail.com>
Link: https://patch.msgid.link/20260715010205.514132-1-vishnuocv@gmail.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

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Vishnu Sankar 2026-07-15 10:02:05 +09:00 • committed by Ilpo Järvinen

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drivers/platform/x86/lenovo/thinkpad_acpi.c

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