driver/ioexpander_it8801: add I/O expander driver for GPIO

IT8801 is an I/O expander with the gpio. Add api compatible with
ioexpander_drv so the main io expander framework can make use
of the pins on the it8801.

BUG=b/138352732, b/146996723
BRANCH=none
TEST=Use gpio.inc to declare the gpio state.
The console command #ioexget can get as follows:
  0  O L IT8801_G0_00
  1  O H IT8801_G0_03
  1  O H IT8801_G0_04
  0  O L IT8801_G0_06
  0  O L IT8801_G0_07
  1  O H ODR IT8801_G1_10
  1  O H ODR IT8801_G1_11
  1  O H ODR IT8801_G1_12
  1  I H IT8801_G1_13
  1  I H IT8801_G1_14
  1  I H IT8801_G1_15
  1  O H ODR IT8801_G2_20
  1  O H ODR IT8801_G2_21
  0  O L ODR IT8801_G2_22
  0  O L ODR IT8801_G2_23
TEST=jacuzzi, juniper and kappa still compile
TEST=keyboard scanning still works
TEST=keyboard scanning now uses fewer i2c packets due to caching of GPIO23

Change-Id: I7ad89058ccd43b073d648e93877b86d6f187b5df
Signed-off-by: tim <tim2.lin@ite.corp-partner.google.com>
Signed-off-by: Alexandru M Stan <amstan@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1712887
Reviewed-by: David Huang <David.Huang@quantatw.com>
Reviewed-by: Ting Shen <phoenixshen@chromium.org>
Tested-by: David Huang <David.Huang@quantatw.com>

4 files changed, 39 insertions, 1 deletions

diff --git a/board/damu/board.c b/board/damu/board.c
index 4639a23e50..0fd5487f95 100644
--- a/board/damu/board.c
+++ b/board/damu/board.c
@@ -27,6 +27,8 @@
 #include "hooks.h"
 #include "host_command.h"
 #include "i2c.h"
+#include "it8801.h"
+#include "keyboard_scan.h"
 #include "lid_switch.h"
 #include "power.h"
 #include "power_button.h"
@@ -79,6 +81,32 @@ const struct power_signal_info power_signal_list[] = {
 };
 BUILD_ASSERT(ARRAY_SIZE(power_signal_list) == POWER_SIGNAL_COUNT);
 
+/* Keyboard scan setting */
+struct keyboard_scan_config keyscan_config = {
+	/*
+	 * TODO(b/133200075): Tune this once we have the final performance
+	 * out of the driver and the i2c bus.
+	 */
+	.output_settle_us = 35,
+	.debounce_down_us = 5 * MSEC,
+	.debounce_up_us = 40 * MSEC,
+	.scan_period_us = 3 * MSEC,
+	.min_post_scan_delay_us = 1000,
+	.poll_timeout_us = 100 * MSEC,
+	.actual_key_mask = {
+		0x14, 0xff, 0xff, 0xff, 0xff, 0xf5, 0xff,
+		0xa4, 0xff, 0xfe, 0x55, 0xfa, 0xca  /* full set */
+	},
+};
+
+struct ioexpander_config_t ioex_config[CONFIG_IO_EXPANDER_PORT_COUNT] = {
+	[0] = {
+		.i2c_host_port = I2C_PORT_IO_EXPANDER_IT8801,
+		.i2c_slave_addr = IT8801_I2C_ADDR,
+		.drv = &it8801_ioexpander_drv,
+	},
+};
+
 /******************************************************************************/
 /* SPI devices */
 /* TODO: to be added once sensors land via CL:1714436 */
diff --git a/board/damu/board.h b/board/damu/board.h
index 8399a19b81..8e45ebc3e6 100644
--- a/board/damu/board.h
+++ b/board/damu/board.h
@@ -81,6 +81,14 @@
 		(EC_HOST_EVENT_MASK(EC_HOST_EVENT_LID_OPEN) |\
 		 EC_HOST_EVENT_MASK(EC_HOST_EVENT_POWER_BUTTON))
 
+#define CONFIG_IO_EXPANDER
+#define CONFIG_IO_EXPANDER_IT8801
+#define CONFIG_IO_EXPANDER_PORT_COUNT 1
+#define CONFIG_KEYBOARD_DEBUG
+#define CONFIG_KEYBOARD_NOT_RAW
+#define CONFIG_KEYBOARD_BOARD_CONFIG
+#define CONFIG_KEYBOARD_COL2_INVERTED
+
 #define PD_OPERATING_POWER_MW 30000
 
 #ifndef __ASSEMBLER__
diff --git a/board/damu/ec.tasklist b/board/damu/ec.tasklist
index f4fb8670ea..4b7574652e 100644
--- a/board/damu/ec.tasklist
+++ b/board/damu/ec.tasklist
@@ -15,6 +15,7 @@
 	TASK_NOTEST(PDCMD, pd_command_task, NULL, 1024) \
 	TASK_ALWAYS(HOSTCMD, host_command_task, NULL, 1024) \
 	TASK_ALWAYS(CONSOLE, console_task, NULL, LARGER_TASK_STACK_SIZE) \
+	TASK_NOTEST(KEYSCAN, keyboard_scan_task, NULL, LARGER_TASK_STACK_SIZE) \
 	TASK_ALWAYS(PD_C0, pd_task, NULL, 1280) \
 	TASK_ALWAYS(PD_INT_C0, pd_interrupt_handler_task, 0, 1024) \
 	TASK_ALWAYS_RO(EMMC, emmc_task, NULL, LARGER_TASK_STACK_SIZE)
diff --git a/board/damu/gpio.inc b/board/damu/gpio.inc
index 16daee88ee..90f6edd908 100644
--- a/board/damu/gpio.inc
+++ b/board/damu/gpio.inc
@@ -33,11 +33,12 @@ GPIO_INT(AC_PRESENT,        PIN(A, 6),  GPIO_INT_BOTH,
          extpower_interrupt) /* ACOK_OD */
 GPIO_INT(BC12_EC_INT_ODL,   PIN(C, 9),  GPIO_INT_FALLING,
          bc12_interrupt)
+GPIO_INT(IT8801_SMB_INT,    PIN(A, 8),  GPIO_INT_FALLING | GPIO_PULL_UP,
+         io_expander_it8801_interrupt) /* KB_INT_ODL */
 GPIO_INT(AP_EC_WATCHDOG_L,  PIN(D, 2),  GPIO_INT_FALLING,
          chipset_watchdog_interrupt)
 
 /* Unimplemented interrupts */
-GPIO(KB_INT_ODL,           PIN(A, 8),  GPIO_INPUT)
 GPIO(ALS_RGB_INT_ODL,      PIN(C, 10), GPIO_INPUT)
 GPIO(TABLET_MODE_L,        PIN(B, 11), GPIO_INPUT)