Swanky: To implement battery shipping mode.

According Battery pack SPEC, the battery shipping mode
set condition must be meet below items.
1.AC adaptor attached.
2.The each cell voltage is under 4000mV.

BUG=chrome-os-partner:29077
BRANCH=rambi
TEST=The battery pack can be set shipping mode and wake up
from shipping mode success by ectool batterycutoff command.

Change-Id: I80439040021a82e5635c22546f725a70b47a863f
Signed-off-by: Aaron Weng <aaron.weng@quantatw.com>
Reviewed-on: https://chromium-review.googlesource.com/201815
Reviewed-by: Dave Parker <dparker@chromium.org>

1 files changed, 76 insertions, 6 deletions

diff --git a/board/swanky/battery.c b/board/swanky/battery.c
index f5f995b636..783fd923bd 100644
--- a/board/swanky/battery.c
+++ b/board/swanky/battery.c
@@ -8,12 +8,28 @@
 #include "battery.h"
 #include "battery_smart.h"
 #include "console.h"
+#include "extpower.h"
 #include "gpio.h"
 #include "host_command.h"
 #include "util.h"
+#include "hooks.h"
+
+/* Console output macros */
+#define CPRINTF(format, args...) cprintf(CC_CHARGER, format, ## args)
+
+/* Battery FET ON/OFF command write to FET off register */
+#define SB_CELLS_VOLTAGE_MAX	4000	/* mV */
+#define SB_CELL_1_VOLTAGE_REG	0x3F
+#define SB_CELL_2_VOLTAGE_REG	0x3E
+#define SB_CELL_3_VOLTAGE_REG	0x3D
+#define SB_FET_ONOFF_REG	0x35
+#define SB_FET_ON_DATA		0x0003
+#define SB_FET_OFF_DATA		0x0004
+#define SB_FET_STATUS_REG	0x34
+#define SB_FET_ONOFF_STATUS	0x0004
+#define SB_FET_OFF_STATUS	0x0004
+#define SB_FET_ON_STATUS	0x0000
 
-/* Shutdown mode parameter to write to manufacturer access register */
-#define SB_SHUTDOWN_DATA	0x0010
 
 static const struct battery_info info = {
 	.voltage_max    = 12600,	/* mV */
@@ -33,17 +49,71 @@ const struct battery_info *battery_get_info(void)
 	return &info;
 }
 
+static void wakeup_deferred(void)
+{
+	int tmp;
+	if (extpower_is_present()) {
+		sb_read(SB_FET_STATUS_REG, &tmp);
+		if ((tmp & SB_FET_ONOFF_STATUS) == SB_FET_OFF_STATUS) {
+			sb_write(SB_FET_ONOFF_REG, SB_FET_ON_DATA);
+			CPRINTF("[%T Battery wakeup]\n");
+		}
+	}
+}
+DECLARE_DEFERRED(wakeup_deferred);
+
+static void wakeup(void)
+{
+	/*
+	 * The deferred call ensures thet wakeup_deferred is called from a
+	 * task. This is required to talk to the battery over I2C.
+	 */
+	hook_call_deferred(wakeup_deferred, 0);
+}
+DECLARE_HOOK(HOOK_INIT, wakeup, HOOK_PRIO_DEFAULT);
+
 static int cutoff(void)
 {
-	int rv;
+	int rv, tmp, cell_voltage;
+
+	/* To check AC adaptor is present or not */
+	if (!extpower_is_present()) {
+		CPRINTF("[%T AC Adaptor is not present]\n");
+		return EC_ERROR_UNKNOWN;
+	}
+
+	/* To check the cell voltage of battery pack */
+	sb_read(SB_CELL_1_VOLTAGE_REG, &cell_voltage);
+	if (cell_voltage >= SB_CELLS_VOLTAGE_MAX) {
+		CPRINTF("[%T Battery cell 1 voltage is too high]\n");
+		return EC_ERROR_UNKNOWN;
+	}
 
-	/* Ship mode command must be sent twice to take effect */
-	rv = sb_write(SB_MANUFACTURER_ACCESS, SB_SHUTDOWN_DATA);
+	sb_read(SB_CELL_2_VOLTAGE_REG, &cell_voltage);
+	if (cell_voltage >= SB_CELLS_VOLTAGE_MAX) {
+		CPRINTF("[%T Battery cell 2 voltage is too high]\n");
+		return EC_ERROR_UNKNOWN;
+	}
+
+	sb_read(SB_CELL_3_VOLTAGE_REG, &cell_voltage);
+	if (cell_voltage >= SB_CELLS_VOLTAGE_MAX) {
+		CPRINTF("[%T Battery cell 3 voltage is too high]\n");
+		return EC_ERROR_UNKNOWN;
+	}
+
+	/* Ship mode command must be sent to take effect */
+	rv = sb_write(SB_FET_ONOFF_REG, SB_FET_OFF_DATA);
 
 	if (rv != EC_SUCCESS)
 		return rv;
 
-	return sb_write(SB_MANUFACTURER_ACCESS, SB_SHUTDOWN_DATA);
+	sb_read(SB_FET_STATUS_REG, &tmp);
+	if ((tmp & SB_FET_ONOFF_STATUS) == SB_FET_OFF_STATUS) {
+		CPRINTF("[%T Battery cut off]\n");
+		return EC_SUCCESS;
+	}
+
+	return EC_ERROR_UNKNOWN;
 }
 
 static int battery_command_cut_off(struct host_cmd_handler_args *args)