nyan: add info_precharge for drained battery

Charger v2 assumes the battery_get_info() always returns non-NULL even
if the battery is not detected, for example, in the over-drained
situation. Thus, add a new struct so that we know what the conservative
setting is to pre-charge the unknown battery.

BUG=chrome-os-partner:28112
BRANCH=nyan,big,blaze
TEST=See issue tracker for the test procedure.

Change-Id: Ica4fe75d154e2f195eb1da19ba045346da383b6c
Signed-off-by: Louis Yung-Chieh Lo <yjlou@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/195596
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-by: Devin Lu <Devin.Lu@quantatw.com>
Tested-by: Devin Lu <Devin.Lu@quantatw.com>

board/big/battery.c

@@ -30,6 +30,29 @@ struct battery_device {
 	int			support_cut_off;
 };
 
+/*
+ * Used for the case that battery cannot be detected, such as the pre-charge
+ * case. In this case, we need to provide the battery with the enough voltage
+ * (usually the highest voltage among batteries, but the smallest precharge
+ * current). This should be as conservative as possible.
+ */
+static struct battery_info info_precharge = {
+
+	.voltage_max    = 12900,  /* the max voltage among batteries */
+	.voltage_normal = 11400,
+	.voltage_min    =  9000,
+
+	/* Pre-charge values. */
+	.precharge_current  = 256,  /* mA, the min current among batteries */
+
+	.start_charging_min_c = 0,
+	.start_charging_max_c = 50,
+	.charging_min_c       = 0,
+	.charging_max_c       = 60,
+	.discharging_min_c    = 0,
+	.discharging_max_c    = 75,
+};
+
 static struct battery_info info_2s = {
 	/*
 	 * Design voltage
@@ -252,16 +275,16 @@ const struct battery_info *battery_get_info(void)
 
 	if (battery_manufacturer_name(manuf, sizeof(manuf))) {
 		CPRINTF("[%T Failed to get MANUF name]\n");
-		return NULL;
+		return &info_precharge;
 	}
 
 	if (battery_device_name(device, sizeof(device))) {
 		CPRINTF("[%T Failed to get DEVICE name]\n");
-		return NULL;
+		return &info_precharge;
 	}
 	if (battery_design_voltage((int *)&design_mv)) {
 		CPRINTF("[%T Failed to get DESIGN_VOLTAGE]\n");
-		return NULL;
+		return &info_precharge;
 	}
 
 	for (i = 0; i < ARRAY_SIZE(support_batteries); ++i) {
@@ -276,7 +299,9 @@ const struct battery_info *battery_get_info(void)
 		}
 	}
 
-	return NULL;
+	CPRINTF("[%T un-recognized battery Manuf:%s, Device:%s]\n",
+		manuf, device);
+	return &info_precharge;
 }
 
 int battery_command_cut_off(struct host_cmd_handler_args *args)

board/blaze/battery.c

@@ -29,6 +29,30 @@ struct battery_device {
 	int			support_cut_off;
 };
 
+/*
+ * Used for the case that battery cannot be detected, such as the pre-charge
+ * case. In this case, we need to provide the battery with the enough voltage
+ * (usually the highest voltage among batteries, but the smallest precharge
+ * current). This should be as conservative as possible.
+ */
+static struct battery_info info_precharge = {
+
+	.voltage_max    = 13050,    /* the max voltage among batteries */
+	.voltage_normal = 11400,
+	.voltage_min    =  9000,
+
+	/* Pre-charge values. */
+	.precharge_current  = 392,  /* mA, the min current among batteries */
+
+	.start_charging_min_c = 0,
+	.start_charging_max_c = 60,
+	.charging_min_c       = 0,
+	.charging_max_c       = 60,
+	.discharging_min_c    = 0,
+	.discharging_max_c    = 60,
+};
+
+
 static struct battery_info info_3s = {
 
 	.voltage_max    = 13050,
@@ -176,16 +200,16 @@ const struct battery_info *battery_get_info(void)
 
 	if (battery_manufacturer_name(manuf, sizeof(manuf))) {
 		CPRINTF("[%T Failed to get MANUF name]\n");
-		return NULL;
+		return &info_precharge;
 	}
 
 	if (battery_device_name(device, sizeof(device))) {
 		CPRINTF("[%T Failed to get DEVICE name]\n");
-		return NULL;
+		return &info_precharge;
 	}
 	if (battery_design_voltage((int *)&design_mv)) {
 		CPRINTF("[%T Failed to get DESIGN_VOLTAGE]\n");
-		return NULL;
+		return &info_precharge;
 	}
 
 	for (i = 0; i < ARRAY_SIZE(support_batteries); ++i) {
@@ -200,7 +224,9 @@ const struct battery_info *battery_get_info(void)
 		}
 	}
 
-	return NULL;
+	CPRINTF("[%T un-recognized battery Manuf:%s, Device:%s]\n",
+		manuf, device);
+	return &info_precharge;
 }
 
 static int cutoff(void)

board/nyan/battery.c

@@ -30,6 +30,39 @@ struct battery_device {
 	int			support_cut_off;
 };
 
+/*
+ * Used for the case that battery cannot be detected, such as the pre-charge
+ * case. In this case, we need to provide the battery with the enough voltage
+ * (usually the highest voltage among batteries, but the smallest precharge
+ * current). This should be as conservative as possible.
+ */
+static struct battery_info info_precharge = {
+	/*
+	 * Design voltage
+	 *   max    = 8.4V
+	 *   normal = 7.4V
+	 *   min    = 6.0V
+	 */
+	.voltage_max    = 12600,  /* the max voltage among batteries */
+	.voltage_normal = 11100,
+	.voltage_min    = 9000,
+
+	/* Pre-charge current: I <= 0.01C */
+	.precharge_current  = 64,  /* mA, the min current among batteries */
+
+	/*
+	 * Operational temperature range
+	 *   0 <= T_charge    <= 50 deg C
+	 * -20 <= T_discharge <= 60 deg C
+	 */
+	.start_charging_min_c = 0,
+	.start_charging_max_c = 50,
+	.charging_min_c       = 0,
+	.charging_max_c       = 50,
+	.discharging_min_c    = 0,
+	.discharging_max_c    = 60,
+};
+
 static struct battery_info info_2s = {
 	/*
 	 * Design voltage
@@ -204,16 +237,16 @@ const struct battery_info *battery_get_info(void)
 
 	if (battery_manufacturer_name(manuf, sizeof(manuf))) {
 		CPRINTF("[%T Failed to get MANUF name]\n");
-		return NULL;
+		return &info_precharge;
 	}
 
 	if (battery_device_name(device, sizeof(device))) {
 		CPRINTF("[%T Failed to get DEVICE name]\n");
-		return NULL;
+		return &info_precharge;
 	}
 	if (battery_design_voltage((int *)&design_mv)) {
 		CPRINTF("[%T Failed to get DESIGN_VOLTAGE]\n");
-		return NULL;
+		return &info_precharge;
 	}
 
 	for (i = 0; i < ARRAY_SIZE(support_batteries); ++i) {
@@ -228,7 +261,9 @@ const struct battery_info *battery_get_info(void)
 		}
 	}
 
-	return NULL;
+	CPRINTF("[%T un-recognized battery Manuf:%s, Device=%s]\n",
+		manuf, device);
+	return &info_precharge;
 }
 
 int battery_command_cut_off(struct host_cmd_handler_args *args)

common/charge_state_v2.c

@@ -284,12 +284,12 @@ static int charge_request(int voltage, int current)
 
 	CPRINTF("[%T %s(%dmV, %dmA)]\n", __func__, voltage, current);
 
-	if (voltage > 0)
+	if (voltage >= 0)
 		r1 = charger_set_voltage(voltage);
 	if (r1 != EC_SUCCESS)
 		problem(PR_SET_VOLTAGE, r1);
 
-	if (current > 0)
+	if (current >= 0)
 		r2 = charger_set_current(current);
 	if (r2 != EC_SUCCESS)
 		problem(PR_SET_CURRENT, r2);
@@ -538,8 +538,14 @@ void charger_task(void)
 		} else {
 			/* The battery is responding. Yay. Try to use it. */
 			if (curr.state == ST_PRECHARGE ||
-			    battery_seems_to_be_dead)
+			    battery_seems_to_be_dead) {
 				ccprintf("[%T battery woke up]\n");
+
+				/* Update the battery-specific values */
+				batt_info = battery_get_info();
+				need_static = 1;
+			}
+
 			battery_seems_to_be_dead = 0;
 			curr.state = ST_CHARGE;
 		}