1 files changed, 115 insertions, 0 deletions
diff --git a/chip/lm4/keyboard_scan_stub.c b/chip/lm4/keyboard_scan_stub.c
new file mode 100644
index 0000000000..01d1aca8e2
--- /dev/null
+++ b/chip/lm4/keyboard_scan_stub.c
@@ -0,0 +1,115 @@
+/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* Functions needed by keyboard scanner module for Chrome EC */
+
+#include "board.h"
+#include "keyboard_scan.h"
+#include "keyboard_scan_stub.h"
+#include "registers.h"
+
+
+/* Notes:
+ *
+ * Link proto0 board:
+ *
+ *   Columns (outputs):
+ *      KSO0 - KSO7  = PP0:7
+ *      KSO8 - KSO12 = PQ0:4
+ *
+ *   Rows (inputs):
+ *      KSI0 - KSI7  = PN0:7
+ *
+ *   Other:
+ *      PWR_BTN#     = PK7 (handled by gpio module)
+ */
+
+
+static int enable_scanning = 1;  /* Must init to 1 for scanning at boot */
+
+
+void lm4_set_scanning_enabled(int enabled)
+{
+	enable_scanning = enabled;
+}
+
+
+int lm4_get_scanning_enabled(void)
+{
+	return enable_scanning;
+}
+
+
+void lm4_select_column(int col)
+{
+	if (col == COLUMN_TRI_STATE_ALL || !enable_scanning) {
+		/* Tri-state all outputs */
+		LM4_GPIO_DATA(LM4_GPIO_P, 0xff) = 0xff;
+		LM4_GPIO_DATA(LM4_GPIO_Q, 0x1f) = 0x1f;
+	} else if (col == COLUMN_ASSERT_ALL) {
+		/* Assert all outputs */
+		LM4_GPIO_DATA(LM4_GPIO_P, 0xff) = 0;
+		LM4_GPIO_DATA(LM4_GPIO_Q, 0x1f) = 0;
+	} else {
+		/* Assert a single output */
+		LM4_GPIO_DATA(LM4_GPIO_P, 0xff) = 0xff;
+		LM4_GPIO_DATA(LM4_GPIO_Q, 0x1f) = 0x1f;
+		if (col < 8)
+			LM4_GPIO_DATA(LM4_GPIO_P, 1 << col) = 0;
+		else
+			LM4_GPIO_DATA(LM4_GPIO_Q, 1 << (col - 8)) = 0;
+	}
+}
+
+
+uint32_t lm4_clear_matrix_interrupt_status(void)
+{
+	uint32_t ris = LM4_GPIO_RIS(KB_SCAN_ROW_GPIO);
+	LM4_GPIO_ICR(KB_SCAN_ROW_GPIO) = ris;
+
+	return ris;
+}
+
+
+void lm4_enable_matrix_interrupt(void)
+{
+	LM4_GPIO_IM(KB_SCAN_ROW_GPIO) = 0xff;   /* 1: enable interrupt */
+}
+
+
+void lm4_disable_matrix_interrupt(void)
+{
+	LM4_GPIO_IM(KB_SCAN_ROW_GPIO) = 0;      /* 0: disable interrupt */
+}
+
+
+int lm4_read_raw_row_state(void)
+{
+	return LM4_GPIO_DATA(KB_SCAN_ROW_GPIO, 0xff);
+}
+
+
+void lm4_configure_keyboard_gpio(void)
+{
+	/* Set column outputs as open-drain; we either pull them low or let
+	 * them float high. */
+	LM4_GPIO_AFSEL(LM4_GPIO_P) = 0;  /* KSO[7:0] */
+	LM4_GPIO_AFSEL(LM4_GPIO_Q) &= ~0x1f;  /* KSO[12:8] */
+	LM4_GPIO_DEN(LM4_GPIO_P) = 0xff;
+	LM4_GPIO_DEN(LM4_GPIO_Q) |= 0x1f;
+	LM4_GPIO_DIR(LM4_GPIO_P) = 0xff;
+	LM4_GPIO_DIR(LM4_GPIO_Q) |= 0x1f;
+	LM4_GPIO_ODR(LM4_GPIO_P) = 0xff;
+	LM4_GPIO_ODR(LM4_GPIO_Q) |= 0x1f;
+
+	/* Set row inputs with pull-up */
+	LM4_GPIO_AFSEL(KB_SCAN_ROW_GPIO) &= 0xff;
+	LM4_GPIO_DEN(KB_SCAN_ROW_GPIO) |= 0xff;
+	LM4_GPIO_DIR(KB_SCAN_ROW_GPIO) = 0;
+	LM4_GPIO_PUR(KB_SCAN_ROW_GPIO) = 0xff;
+	/* Edge-sensitive on both edges.  Don't enable interrupts yet. */
+	LM4_GPIO_IS(KB_SCAN_ROW_GPIO) = 0;
+	LM4_GPIO_IBE(KB_SCAN_ROW_GPIO) = 0xff;
+}