---
Changes in v2:
-There was no v2, it is skipped to the version in sync with the rest of
the patch-set
Changes in v3:
-Change into a stand-alone power_supply battery driver instead of being a
provider of extra properties for another battery driver
-Rename Kconfig symbol from CHT_WC_FUEL_GAUGE to BATTERY_INTEL_CHT_WC
---
drivers/power/supply/Kconfig | 9 +
drivers/power/supply/Makefile | 1 +
drivers/power/supply/cht_wc_fuel_gauge.c | 319 +++++++++++++++++++++++++++++++
3 files changed, 329 insertions(+)
create mode 100644 drivers/power/supply/cht_wc_fuel_gauge.c
diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index fd93110..350d86a 100644
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -538,4 +538,13 @@ config AXP20X_POWER
This driver provides support for the power supply features of
AXP20x PMIC.
+config BATTERY_INTEL_CHT_WC
+ tristate "Intel Cherry Trail Whiskey Cove PMIC Fuel Gauge"
+ depends on INTEL_SOC_PMIC_CHTWC
+ help
+ This adds support for the battery fuel gauge found in the Intel
+ Cherry Trail Whiskey Cove PMIC. This driver allows monitoring
+ of the charge level of the battery on Intel Cherry Trail systems
+ with a Whiskey Cove PMIC.
+
endif # POWER_SUPPLY
diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
index 3789a2c..46dca5c 100644
--- a/drivers/power/supply/Makefile
+++ b/drivers/power/supply/Makefile
@@ -74,3 +74,4 @@ obj-$(CONFIG_CHARGER_TPS65090) += tps65090-charger.o
obj-$(CONFIG_CHARGER_TPS65217) += tps65217_charger.o
obj-$(CONFIG_AXP288_FUEL_GAUGE) += axp288_fuel_gauge.o
obj-$(CONFIG_AXP288_CHARGER) += axp288_charger.o
+obj-$(CONFIG_BATTERY_INTEL_CHT_WC) += cht_wc_fuel_gauge.o
diff --git a/drivers/power/supply/cht_wc_fuel_gauge.c b/drivers/power/supply/cht_wc_fuel_gauge.c
new file mode 100644
index 0000000..0db83ad
--- /dev/null
+++ b/drivers/power/supply/cht_wc_fuel_gauge.c
@@ -0,0 +1,319 @@
+/*
+ * Intel Cherry Trail Whiskey Cove Fuel Gauge driver
+ * Copyright (C) 2017 Hans de Goede <hdegoede@xxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/acpi.h>
+#include <linux/delay.h>
+#include <linux/extcon.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/intel_soc_pmic.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+
+#define FG_CHARGE_NOW 0x05
+#define FG_VOLTAGE_NOW 0x09
+#define FG_CURRENT_NOW 0x0a
+#define FG_CURRENT_AVG 0x0b
+#define FG_CHARGE_FULL 0x10
+#define FG_CHARGE_DESIGN 0x18
+#define FG_VOLTAGE_AVG 0x19
+#define FG_VOLTAGE_OCV 0x1b /* Only updated during charging */
+
+#define PMIC_CHGRSTATUS 0x1a
+#define PMIC_CHGRSTATUS_NOT_CHARGING BIT(0)
+
+#define CHT_WC_FG_PTYPE 4
+
+static const unsigned int charger_cable_ids[] = {
+ EXTCON_CHG_USB_SDP, EXTCON_CHG_USB_CDP,
+ EXTCON_CHG_USB_DCP, EXTCON_CHG_USB_ACA
+};
+
+struct cht_wc_fg_data {
+ struct device *dev;
+ /*
+ * The ACPI _CRS table contains info for 4 clients, 1 for the charger-
+ * manager part of the pmic and 3 for the actual fuel-gauge (which has
+ * 3 i2c addresses) note we use only 1 fg address/client.
+ */
+ struct i2c_client *pmic_client;
+ struct i2c_client *fg_client;
+ struct extcon_dev *extcon;
+ struct power_supply *battery;
+ struct work_struct changed_work;
+ struct notifier_block extcon_nb;
+};
+
+static int cht_wc_fg_read(struct cht_wc_fg_data *fg, u8 reg,
+ union power_supply_propval *val, int scale,
+ int sign_extend)
+{
+ int ret;
+
+ ret = i2c_smbus_read_word_data(fg->fg_client, reg);
+ if (ret < 0)
+ return ret;
+
+ if (sign_extend)
+ ret = sign_extend32(ret, 15);
+
+ val->intval = ret * scale;
+
+ return 0;
+}
+
+static int cht_wc_fg_get_status(struct cht_wc_fg_data *fg,
+ union power_supply_propval *val)
+{
+ int i, ret;
+ bool vbus_present = false;
+
+ for (i = 0; i < ARRAY_SIZE(charger_cable_ids); i++) {
+ if (extcon_get_state(fg->extcon, charger_cable_ids[i]) > 0) {
+ vbus_present = true;
+ break;
+ }
+ }
+
+ if (!vbus_present) {
+ val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+ return 0;
+ }
+
+ ret = i2c_smbus_read_byte_data(fg->pmic_client, PMIC_CHGRSTATUS);
+ if (ret < 0)
+ return ret;
+
+ /* Not charging while we have Vbus means the battery is full */
+ if (ret & PMIC_CHGRSTATUS_NOT_CHARGING)
+ val->intval = POWER_SUPPLY_STATUS_FULL;
+ else
+ val->intval = POWER_SUPPLY_STATUS_CHARGING;
+
+ return 0;
+}
+
+static int cht_wc_fg_get_property(struct power_supply *psy,
+ enum power_supply_property prop, union power_supply_propval *val)
+{
+ struct cht_wc_fg_data *fg = power_supply_get_drvdata(psy);
+ int ret = 0;
+
+ switch (prop) {
+ case POWER_SUPPLY_PROP_STATUS:
+ ret = cht_wc_fg_get_status(fg, val);
+ break;
+ case POWER_SUPPLY_PROP_PRESENT:
+ val->intval = 1;
+ break;
+ case POWER_SUPPLY_PROP_TECHNOLOGY:
+ val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ ret = cht_wc_fg_read(fg, FG_VOLTAGE_NOW, val, 75, 0);
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_AVG:
+ ret = cht_wc_fg_read(fg, FG_VOLTAGE_AVG, val, 75, 0);
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_OCV:
+ ret = cht_wc_fg_read(fg, FG_VOLTAGE_OCV, val, 75, 0);
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ ret = cht_wc_fg_read(fg, FG_CURRENT_NOW, val, 150, 1);
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_AVG:
+ ret = cht_wc_fg_read(fg, FG_CURRENT_AVG, val, 150, 1);
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
+ ret = cht_wc_fg_read(fg, FG_CHARGE_DESIGN, val, 500, 0);
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_FULL:
+ ret = cht_wc_fg_read(fg, FG_CHARGE_FULL, val, 500, 0);
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_NOW:
+ ret = cht_wc_fg_read(fg, FG_CHARGE_NOW, val, 500, 0);
+ break;
+ case POWER_SUPPLY_PROP_SCOPE:
+ val->intval = POWER_SUPPLY_SCOPE_SYSTEM;
+ break;
+ default:
+ ret = -ENODATA;
+ }
+
+ return ret;
+}
+
+static void cht_wc_fg_external_power_changed(struct power_supply *psy)
+{
+ struct cht_wc_fg_data *fg = power_supply_get_drvdata(psy);
+
+ schedule_work(&fg->changed_work);
+}
+
+static enum power_supply_property cht_wc_fg_properties[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_PRESENT,
+ POWER_SUPPLY_PROP_TECHNOLOGY,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_VOLTAGE_AVG,
+ POWER_SUPPLY_PROP_VOLTAGE_OCV,
+ POWER_SUPPLY_PROP_CURRENT_NOW,
+ POWER_SUPPLY_PROP_CURRENT_AVG,
+ POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
+ POWER_SUPPLY_PROP_CHARGE_FULL,
+ POWER_SUPPLY_PROP_CHARGE_NOW,
+ POWER_SUPPLY_PROP_SCOPE,
+};
+
+static const struct power_supply_desc bat_desc = {
+ /* Matches charger.supplied_to for external_power_changed callback */
+ .name = "main-battery",
+ .type = POWER_SUPPLY_TYPE_BATTERY,
+ .properties = cht_wc_fg_properties,
+ .num_properties = ARRAY_SIZE(cht_wc_fg_properties),
+ .get_property = cht_wc_fg_get_property,
+ .external_power_changed = cht_wc_fg_external_power_changed,
+};
+
+static void cht_wc_fg_changed_work(struct work_struct *work)
+{
+ struct cht_wc_fg_data *fg =
+ container_of(work, struct cht_wc_fg_data, changed_work);
+
+ /* Wait a bit to allow the fuel-gauge to also detect the new status */
+ msleep(200);
+
+ power_supply_changed(fg->battery);
+}
+
+static int cht_wc_fg_extcon_event(struct notifier_block *nb,
+ unsigned long event, void *param)
+{
+ struct cht_wc_fg_data *fg =
+ container_of(nb, struct cht_wc_fg_data, extcon_nb);
+
+ schedule_work(&fg->changed_work);
+
+ return NOTIFY_OK;
+}
+
+static int cht_wc_fg_probe(struct i2c_client *client,
+ const struct i2c_device_id *i2c_id)
+{
+ struct device *dev = &client->dev;
+ struct power_supply_config bat_cfg = {};
+ struct cht_wc_fg_data *fg;
+ acpi_status status;
+ unsigned long long ptyp;
+ int ret;
+
+ status = acpi_evaluate_integer(ACPI_HANDLE(dev), "PTYP", NULL, &ptyp);
+ if (ACPI_FAILURE(status)) {
+ dev_err(dev, "Failed to get PTYPE\n");
+ return -ENODEV;
+ }
+
+ /*
+ * The same ACPI HID is used with different PMICs check PTYP to
+ * ensure that we are dealing with a Whiskey Cove PMIC.
+ */
+ if (ptyp != CHT_WC_FG_PTYPE)
+ return -ENODEV;
+
+ fg = devm_kzalloc(dev, sizeof(*fg), GFP_KERNEL);
+ if (!fg)
+ return -ENOMEM;
+
+ fg->dev = dev;
+ fg->pmic_client = client;
+ INIT_WORK(&fg->changed_work, cht_wc_fg_changed_work);
+
+ /*
+ * We use the Whiskey Cove PMIC's pwrsrc detection block to see
+ * if we are charging or not. We could access the pwrsrc regs
+ * ourselves, but that requires re-implementing the extcon code,
+ * so we just use the extcon interface.
+ */
+ fg->extcon = extcon_get_extcon_dev("cht_wcove_pwrsrc");
+ if (!fg->extcon)
+ return -EPROBE_DEFER;
+
+ /*
+ * The current resource settings table for the fuel gauge contains
+ * multiple i2c devices on 2 different i2c-busses.
+ */
+ fg->fg_client = i2c_acpi_new_device(dev, 1);
+ if (!fg->fg_client)
+ return -EPROBE_DEFER;
+
+ bat_cfg.drv_data = fg;
+ fg->battery = devm_power_supply_register(dev, &bat_desc, &bat_cfg);
+ if (IS_ERR(fg->battery)) {
+ i2c_unregister_device(fg->fg_client);
+ return PTR_ERR(fg->battery);
+ }
+
+ fg->extcon_nb.notifier_call = cht_wc_fg_extcon_event;
+ ret = devm_extcon_register_notifier(dev, fg->extcon, -1,
+ &fg->extcon_nb);
+ if (ret) {
+ i2c_unregister_device(fg->fg_client);
+ return ret;
+ }
+
+ i2c_set_clientdata(client, fg);
+
+ return 0;
+}
+
+static int cht_wc_fg_remove(struct i2c_client *i2c)
+{
+ struct cht_wc_fg_data *fg = i2c_get_clientdata(i2c);
+
+ i2c_unregister_device(fg->fg_client);
+
+ return 0;
+}
+
+static const struct i2c_device_id cht_wc_fg_i2c_id[] = {
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, cht_wc_fg_i2c_id);
+
+static const struct acpi_device_id cht_wc_fg_acpi_ids[] = {
+ { "INT33FE", },
+ { }
+};
+MODULE_DEVICE_TABLE(acpi, cht_wc_fg_acpi_ids);
+
+static struct i2c_driver cht_wc_fg_driver = {
+ .driver = {
+ .name = "CHT Whiskey Cove PMIC Fuel Gauge",
+ .acpi_match_table = ACPI_PTR(cht_wc_fg_acpi_ids),
+ },
+ .probe = cht_wc_fg_probe,
+ .remove = cht_wc_fg_remove,
+ .id_table = cht_wc_fg_i2c_id,
+ .irq_index = 1,
+};
+
+module_i2c_driver(cht_wc_fg_driver);
+
+MODULE_DESCRIPTION("Intel CHT Whiskey Cove PMIC Fuel Gauge driver");
+MODULE_AUTHOR("Hans de Goede <hdegoede@xxxxxxxxxx>");
+MODULE_LICENSE("GPL");
--
2.9.3
