[coreboot-gerrit] Change in coreboot[master]: ec/lenovo/h8/ssdt: Add keyboard backlight interface

[Patrick Rudolph (Code Review)]

Patrick Rudolph has uploaded this change for review. ( https://review.coreboot.org/21002

Change subject: ec/lenovo/h8/ssdt: Add keyboard backlight interface
......................................................................

ec/lenovo/h8/ssdt: Add keyboard backlight interface

Add methods MLCG and MLCS for thinkpad_acpi kernel module.

Change-Id: Ia65e770e772936c9c32be33c30839a2dee2a107c
Signed-off-by: Patrick Rudolph 
---
M src/ec/lenovo/h8/ssdt.c
1 file changed, 72 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/02/21002/1

diff --git a/src/ec/lenovo/h8/ssdt.c b/src/ec/lenovo/h8/ssdt.c
index 0c68b2b..26c0d84 100644
--- a/src/ec/lenovo/h8/ssdt.c
+++ b/src/ec/lenovo/h8/ssdt.c
@@ -168,6 +168,77 @@
    acpigen_pop_len(); /* Method */
 }

+/* Generate ACPI methods MLCG and MLCS */
+static void h8_dsdt_keyboard_backlight(struct device *dev)
+{
+	struct ec_lenovo_h8_config *conf = dev->chip_info;
+	if (!conf)
+		return;
+
+	const bool has_kbbl = conf->has_keyboard_backlight;
+
+	/* Method (MLCG, 1) */
+	acpigen_write_method("MLCG", 1);
+	/* Store(Zero, Local0) */
+	acpigen_write_store_ops(ZERO_OP, LOCAL0_OP);
+	if (has_kbbl) {
+		/* Keyboard backlight present */
+		/* Or(Local0, (1 << 9), Local0) */
+		acpigen_emit_byte(OR_OP);
+		acpigen_emit_byte(LOCAL0_OP);
+		acpigen_write_integer((1 << 9));
+		acpigen_emit_byte(LOCAL0_OP);
+
+		/* If(LEqual(_SB.PCI0.LPCB.EC.KBLT, One)) */
+		acpigen_write_if();
+		acpigen_emit_byte(LEQUAL_OP);
+		acpigen_emit_namestring(h8_dsdt_scope(dev, "KBLT"));
+		acpigen_emit_byte(ONE_OP);
+
+		/* Or(Local0, 1, Local0) */
+		acpigen_write_or(LOCAL0_OP, ONE_OP, LOCAL0_OP);
+		acpigen_pop_len(); /* If */
+	}
+	/* Return(Local0) */
+	acpigen_emit_byte(RETURN_OP);
+	acpigen_emit_byte(LOCAL0_OP);
+	acpigen_pop_len(); /* Method */
+
+	/* Method (MLCS, 1) */
+	acpigen_write_method("MLCS", 1);
+	if (has_kbbl) {
+		/* And(Arg0, 3, Local0) */
+		acpigen_emit_byte(AND_OP);
+		acpigen_emit_byte(ARG0_OP);
+		acpigen_write_integer(3);
+		acpigen_emit_byte(LOCAL0_OP);
+
+		/* If(LGREATER_OP(Local0, 0)) */
+		acpigen_write_if();
+		acpigen_emit_byte(LGREATER_OP);
+		acpigen_emit_byte(LOCAL0_OP);
+		acpigen_emit_byte(ZERO_OP);
+
+		/* FIXME: Support 2bit brightness control */
+		/* Store(One, _SB.PCI0.LPCB.EC.KBLT) */
+		acpigen_write_store();
+		acpigen_emit_byte(ONE_OP);
+		acpigen_emit_namestring(h8_dsdt_scope(dev, "KBLT"));
+		acpigen_pop_len(); /* If */
+		/* Else */
+		acpigen_write_else();
+		/* Store(Zero, _SB.PCI0.LPCB.EC.KBLT) */
+		acpigen_write_store();
+		acpigen_emit_byte(ZERO_OP);
+		acpigen_emit_namestring(h8_dsdt_scope(dev, "KBLT"));
+		acpigen_pop_len(); /* Else */
+	}
+	/* Return(Zero) */
+	acpigen_emit_byte(RETURN_OP);
+	acpigen_emit_byte(ZERO_OP);
+	acpigen_pop_len(); /* Method */
+}
+
 /*
  * Generates EC SSDT.
  */
@@ -184,6 +255,7 @@
    /* Used by thinkpad_acpi */
    h8_dsdt_bluetooth(dev);
    h8_dsdt_wwan(dev);
+	h8_dsdt_keyboard_backlight(dev);

acpigen_pop_len(); /* Scope HKEY */
 }