i2c-scmi: Support IBM SMBus CMI devices

*) add a new HID for IBM SMBus CMI devices
*) add methods for IBM SMBus CMI devices
*) hook different HID with different control methods set
*) minor tweaks as suggested by Jean Delvare

Slightly modified by Darrick to use #define'd IBM SMBUS HID from Darrick's ACPI
scan quirk patch.
Signed-off-by: Crane Cai <crane.cai@amd.com>
Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

drivers/i2c/busses/i2c-scmi.c

@@ -33,6 +33,7 @@ struct acpi_smbus_cmi {
 	u8 cap_info:1;
 	u8 cap_read:1;
 	u8 cap_write:1;
+	struct smbus_methods_t *methods;
 };
 
 static const struct smbus_methods_t smbus_methods = {
@@ -41,8 +42,16 @@ static const struct smbus_methods_t smbus_methods = {
 	.mt_sbw  = "_SBW",
 };
 
+/* Some IBM BIOSes omit the leading underscore */
+static const struct smbus_methods_t ibm_smbus_methods = {
+	.mt_info = "SBI_",
+	.mt_sbr  = "SBR_",
+	.mt_sbw  = "SBW_",
+};
+
 static const struct acpi_device_id acpi_smbus_cmi_ids[] = {
-	{"SMBUS01", 0},
+	{"SMBUS01", (kernel_ulong_t)&smbus_methods},
+	{ACPI_SMBUS_IBM_HID, (kernel_ulong_t)&ibm_smbus_methods},
 	{"", 0}
 };
 
@@ -150,11 +159,11 @@ acpi_smbus_cmi_access(struct i2c_adapter *adap, u16 addr, unsigned short flags,
 
 	if (read_write == I2C_SMBUS_READ) {
 		protocol |= ACPI_SMBUS_PRTCL_READ;
-		method = smbus_methods.mt_sbr;
+		method = smbus_cmi->methods->mt_sbr;
 		input.count = 3;
 	} else {
 		protocol |= ACPI_SMBUS_PRTCL_WRITE;
-		method = smbus_methods.mt_sbw;
+		method = smbus_cmi->methods->mt_sbw;
 		input.count = 5;
 	}
 
@@ -290,13 +299,13 @@ static int acpi_smbus_cmi_add_cap(struct acpi_smbus_cmi *smbus_cmi,
 	union acpi_object *obj;
 	acpi_status status;
 
-	if (!strcmp(name, smbus_methods.mt_info)) {
+	if (!strcmp(name, smbus_cmi->methods->mt_info)) {
 		status = acpi_evaluate_object(smbus_cmi->handle,
-					smbus_methods.mt_info,
+					smbus_cmi->methods->mt_info,
 					NULL, &buffer);
 		if (ACPI_FAILURE(status)) {
 			ACPI_ERROR((AE_INFO, "Evaluating %s: %i",
-				   smbus_methods.mt_info, status));
+				   smbus_cmi->methods->mt_info, status));
 			return -EIO;
 		}
 
@@ -319,9 +328,9 @@ static int acpi_smbus_cmi_add_cap(struct acpi_smbus_cmi *smbus_cmi,
 
 		kfree(buffer.pointer);
 		smbus_cmi->cap_info = 1;
-	} else if (!strcmp(name, smbus_methods.mt_sbr))
+	} else if (!strcmp(name, smbus_cmi->methods->mt_sbr))
 		smbus_cmi->cap_read = 1;
-	else if (!strcmp(name, smbus_methods.mt_sbw))
+	else if (!strcmp(name, smbus_cmi->methods->mt_sbw))
 		smbus_cmi->cap_write = 1;
 	else
 		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Unsupported CMI method: %s\n",
@@ -349,6 +358,7 @@ static acpi_status acpi_smbus_cmi_query_methods(acpi_handle handle, u32 level,
 static int acpi_smbus_cmi_add(struct acpi_device *device)
 {
 	struct acpi_smbus_cmi *smbus_cmi;
+	const struct acpi_device_id *id;
 
 	smbus_cmi = kzalloc(sizeof(struct acpi_smbus_cmi), GFP_KERNEL);
 	if (!smbus_cmi)
@@ -362,6 +372,11 @@ static int acpi_smbus_cmi_add(struct acpi_device *device)
 	smbus_cmi->cap_read = 0;
 	smbus_cmi->cap_write = 0;
 
+	for (id = acpi_smbus_cmi_ids; id->id[0]; id++)
+		if (!strcmp(id->id, acpi_device_hid(device)))
+			smbus_cmi->methods =
+				(struct smbus_methods_t *) id->driver_data;
+
 	acpi_walk_namespace(ACPI_TYPE_METHOD, smbus_cmi->handle, 1,
 			    acpi_smbus_cmi_query_methods, NULL, smbus_cmi, NULL);