[PATCH] ACPI: EC: Rewrite DMI checks

[Alexey Starikovskiy <astarikovskiy@suse.de>]

"Notebook" name is not unique to MSI, thus should not be used
to identify MSI hardware.
Use dmi_check_system() for DMI matching.wq

References: http://bugzilla.kernel.org/show_bug.cgi?id=14086
Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
---

 drivers/acpi/ec.c |   49 +++++++++++++++++++++++++++++++++++++++++++------
 1 files changed, 43 insertions(+), 6 deletions(-)


diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index f707960..da7da37 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -119,6 +119,8 @@ static struct acpi_ec {
 } *boot_ec, *first_ec;
 
 static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */
+static int EC_FLAGS_VALIDATE_ECDT; /* ASUStec ECDTs need to be validated */
+static int EC_FLAGS_SKIP_DSDT_SCAN; /* Not all BIOS survive early DSDT scan */
 
 /* --------------------------------------------------------------------------
                              Transaction Management
@@ -899,6 +901,41 @@ static const struct acpi_device_id ec_device_ids[] = {
 	{"", 0},
 };
 
+/* Some BIOS do not survive early DSDT scan, skip it */
+static int ec_skip_dsdt_scan(const struct dmi_system_id *id) {
+	EC_FLAGS_SKIP_DSDT_SCAN = 1;
+	return 0;
+}
+
+/* ASUStek often supplies us with broken ECDT, validate it */
+static int ec_validate_ecdt(const struct dmi_system_id *id) {
+	EC_FLAGS_VALIDATE_ECDT = 1;
+	return 0;
+}
+
+/* MSI EC needs special treatment, enable it */
+static int ec_flag_msi(const struct dmi_system_id *id) {
+	EC_FLAGS_MSI = 1;
+	EC_FLAGS_VALIDATE_ECDT = 1;
+	return 0;
+}
+
+static struct dmi_system_id __initdata ec_dmi_table[] = {
+	{
+	ec_skip_dsdt_scan, "Compal JFL92", {
+	DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
+	DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL},
+	{
+	ec_flag_msi, "MSI hardware", {
+	DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star"),
+	DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star") }, NULL},
+	{
+	ec_validate_ecdt, "ASUS hardware", {
+	DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL},
+	{},
+};
+
+
 int __init acpi_ec_ecdt_probe(void)
 {
 	acpi_status status;
@@ -911,11 +948,7 @@ int __init acpi_ec_ecdt_probe(void)
 	/*
 	 * Generate a boot ec context
 	 */
-	if (dmi_name_in_vendors("Micro-Star") ||
-	    dmi_name_in_vendors("Notebook")) {
-		pr_info(PREFIX "Enabling special treatment for EC from MSI.\n");
-		EC_FLAGS_MSI = 1;
-	}
+	dmi_check_system(ec_dmi_table);
 	status = acpi_get_table(ACPI_SIG_ECDT, 1,
 				(struct acpi_table_header **)&ecdt_ptr);
 	if (ACPI_SUCCESS(status)) {
@@ -926,7 +959,7 @@ int __init acpi_ec_ecdt_probe(void)
 		boot_ec->handle = ACPI_ROOT_OBJECT;
 		acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle);
 		/* Don't trust ECDT, which comes from ASUSTek */
-		if (!dmi_name_in_vendors("ASUS") && EC_FLAGS_MSI == 0)
+		if (!EC_FLAGS_VALIDATE_ECDT)
 			goto install;
 		saved_ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
 		if (!saved_ec)
@@ -934,6 +967,10 @@ int __init acpi_ec_ecdt_probe(void)
 		memcpy(saved_ec, boot_ec, sizeof(struct acpi_ec));
 	/* fall through */
 	}
+
+	if (EC_FLAGS_SKIP_DSDT_SCAN)
+		return -ENODEV;
+
 	/* This workaround is needed only on some broken machines,
 	 * which require early EC, but fail to provide ECDT */
 	printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n");