[PATCH 2/2] i2c: acpi: Add AttribRawBytes accessor-type support to OpRegion handler

[Hans de Goede <johannes.goede@oss.qualcomm.com>]

Add AttribRawBytes accessor-type support to OpRegion handler, this is used
by the ACPI tables on a ThinkPad T14s gen6 Snapdragon laptop.

Looking at the AML it seems the expected behavior is to simply read or
write accessor-length bytes and this implementation allows successful
communication with the EC on a T14s gen6 Snapdragon laptop.

Signed-off-by: Hans de Goede <johannes.goede@oss.qualcomm.com>
---
 drivers/i2c/i2c-core-acpi.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c
index 583d89c626e3..31fd88e63bf5 100644
--- a/drivers/i2c/i2c-core-acpi.c
+++ b/drivers/i2c/i2c-core-acpi.c
@@ -766,6 +766,18 @@ i2c_acpi_space_handler(u32 function, acpi_physical_address command,
 		}
 		break;
 
+	case ACPI_GSB_ACCESS_ATTRIB_RAW_BYTES:
+		if (action == ACPI_READ)
+			status = i2c_master_recv(client, gsb->data, info->access_length);
+		else
+			status = i2c_master_send(client, gsb->data, info->access_length);
+
+		if (status >= 0) {
+			gsb->len = status;
+			status = 0;
+		}
+		break;
+
 	default:
 		dev_warn(&adapter->dev, "protocol 0x%02x not supported for client 0x%02x\n",
 			 accessor_type, client->addr);
-- 
2.55.0