summaryrefslogtreecommitdiff
path: root/board/kahlee/battery.c
diff options
context:
space:
mode:
Diffstat (limited to 'board/kahlee/battery.c')
-rw-r--r--board/kahlee/battery.c89
1 files changed, 89 insertions, 0 deletions
diff --git a/board/kahlee/battery.c b/board/kahlee/battery.c
new file mode 100644
index 0000000000..1d6d30e890
--- /dev/null
+++ b/board/kahlee/battery.c
@@ -0,0 +1,89 @@
+/* Copyright 2017 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.
+ *
+ * Battery pack vendor provided charging profile
+ */
+#include "battery.h"
+#include "battery_smart.h"
+#include "extpower.h"
+#include "gpio.h"
+
+/* Shutdown mode parameter to write to manufacturer access register */
+#define SB_SHUTDOWN_DATA 0x0010
+
+static enum battery_present batt_pres_prev = BP_NOT_SURE;
+
+static const struct battery_info info = {
+ .voltage_max = 13200,/* mV */
+ .voltage_normal = 11400,
+ .voltage_min = 9000,
+ .precharge_current = 256,/* mA */
+ .start_charging_min_c = 0,
+ .start_charging_max_c = 50,
+ .charging_min_c = 0,
+ .charging_max_c = 60,
+ .discharging_min_c = -20,
+ .discharging_max_c = 70,
+};
+const struct battery_info *battery_get_info(void)
+{
+ return &info;
+}
+int board_cut_off_battery(void)
+{
+ int rv;
+ /* Ship mode command must be sent twice to take effect */
+ rv = sb_write(SB_MANUFACTURER_ACCESS, SB_SHUTDOWN_DATA);
+ if (rv != EC_SUCCESS)
+ return rv;
+ return sb_write(SB_MANUFACTURER_ACCESS, SB_SHUTDOWN_DATA);
+}
+
+static inline enum battery_present battery_hw_present(void)
+{
+ /* The GPIO is low when the battery is physically present */
+ return gpio_get_level(GPIO_EC_BATT_PRES_L) ? BP_NO : BP_YES;
+}
+
+static int battery_init(void)
+{
+ int batt_status;
+
+ return battery_status(&batt_status) ? 0 :
+ !!(batt_status & STATUS_INITIALIZED);
+}
+
+/*
+ * Physical detection of battery.
+ */
+enum battery_present battery_is_present(void)
+{
+ enum battery_present batt_pres;
+
+ /* Get the physical hardware status */
+ batt_pres = battery_hw_present();
+
+ /*
+ * Make sure battery status is implemented, I2C transactions are
+ * success & the battery status is Initialized to find out if it
+ * is a working battery and it is not in the cut-off mode.
+ *
+ * If battery I2C fails but VBATT is high, battery is booting from
+ * cut-off mode.
+ *
+ * FETs are turned off after Power Shutdown time.
+ * The device will wake up when a voltage is applied to PACK.
+ * Battery status will be inactive until it is initialized.
+ */
+ if (batt_pres == BP_YES && batt_pres_prev != batt_pres &&
+ !battery_is_cut_off() && !battery_init()) {
+ batt_pres = BP_NO;
+ }
+
+ batt_pres_prev = batt_pres;
+
+ return batt_pres;
+}
+
+