[PATCH v4] ACPI: Parse entire table as a term_list for Dell XPS 9570 and Precision M5530

[Kai-Heng Feng]

The i2c touchpad on Dell XPS 9570 and Precision M5530 doesn't work out
of box.

The touchpad relies on its _INI method to update its _HID value from
XXXX0000 to SYNA2393.
Also, the _STA relies on value of I2CN to report correct status.

Set acpi_gbl_parse_table_as_term_list so the value of I2CN can be
correctly set up, and _INI can get run. The ACPI table in this machine
is designed to get parsed this way.

Also, change the quirk table to a more generic name.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=198515
Cc: Mario Limonciello <mario.limonciello@xxxxxxxx>
Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>
---
v4: Remove unnecessary message for user.

v3: Put the function under right #ifdef, comment adjustment

v2: Andy's suggestion, merge to a single quirk table.
 drivers/acpi/bus.c | 38 +++++++++++++++++++++++++++++++-------
 1 file changed, 31 insertions(+), 7 deletions(-)

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index f87ed3be779a..11c6dda233d6 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -66,10 +66,37 @@ static int set_copy_dsdt(const struct dmi_system_id *id)
 	return 0;
 }
 #endif
+static int set_gbl_term_list(const struct dmi_system_id *id)
+{
+	acpi_gbl_parse_table_as_term_list = 1;
+	return 0;
+}
 
-static const struct dmi_system_id dsdt_dmi_table[] __initconst = {
+static const struct dmi_system_id acpi_quirks_dmi_table[] __initconst = {
+	/*
+	 * Touchpad on Dell XPS 9570/Precision M5530 doesn't work under I2C
+	 * mode.
+	 * https://bugzilla.kernel.org/show_bug.cgi?id=198515
+	 */
+	{
+		.callback = set_gbl_term_list,
+		.ident = "Dell Precision M5530",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Precision M5530"),
+		},
+	},
+	{
+		.callback = set_gbl_term_list,
+		.ident = "Dell XPS 15 9570",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "XPS 15 9570"),
+		},
+	},
 	/*
 	 * Invoke DSDT corruption work-around on all Toshiba Satellite.
+	 * DSDT will be copied to memory.
 	 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
 	 */
 	{
@@ -83,7 +110,7 @@ static const struct dmi_system_id dsdt_dmi_table[] __initconst = {
 	{}
 };
 #else
-static const struct dmi_system_id dsdt_dmi_table[] __initconst = {
+static const struct dmi_system_id acpi_quirks_dmi_table[] __initconst = {
 	{}
 };
 #endif
@@ -1019,11 +1046,8 @@ void __init acpi_early_init(void)
 
 	acpi_permanent_mmap = true;
 
-	/*
-	 * If the machine falls into the DMI check table,
-	 * DSDT will be copied to memory
-	 */
-	dmi_check_system(dsdt_dmi_table);
+	/* Check machine-specific quirks */
+	dmi_check_system(acpi_quirks_dmi_table);
 
 	status = acpi_reallocate_root_table();
 	if (ACPI_FAILURE(status)) {
-- 
2.15.1