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-rw-r--r--drivers/power/supply/max8997_charger.c287
1 files changed, 287 insertions, 0 deletions
diff --git a/drivers/power/supply/max8997_charger.c b/drivers/power/supply/max8997_charger.c
new file mode 100644
index 000000000..1ec3535a2
--- /dev/null
+++ b/drivers/power/supply/max8997_charger.c
@@ -0,0 +1,287 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// max8997_charger.c - Power supply consumer driver for the Maxim 8997/8966
+//
+// Copyright (C) 2011 Samsung Electronics
+// MyungJoo Ham <myungjoo.ham@samsung.com>
+
+#include <linux/err.h>
+#include <linux/extcon.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/mfd/max8997.h>
+#include <linux/mfd/max8997-private.h>
+#include <linux/regulator/consumer.h>
+#include <linux/devm-helpers.h>
+
+/* MAX8997_REG_STATUS4 */
+#define DCINOK_SHIFT 1
+#define DCINOK_MASK (1 << DCINOK_SHIFT)
+#define DETBAT_SHIFT 2
+#define DETBAT_MASK (1 << DETBAT_SHIFT)
+
+/* MAX8997_REG_MBCCTRL1 */
+#define TFCH_SHIFT 4
+#define TFCH_MASK (7 << TFCH_SHIFT)
+
+/* MAX8997_REG_MBCCTRL5 */
+#define ITOPOFF_SHIFT 0
+#define ITOPOFF_MASK (0xF << ITOPOFF_SHIFT)
+
+struct charger_data {
+ struct device *dev;
+ struct max8997_dev *iodev;
+ struct power_supply *battery;
+ struct regulator *reg;
+ struct extcon_dev *edev;
+ struct notifier_block extcon_nb;
+ struct work_struct extcon_work;
+};
+
+static enum power_supply_property max8997_battery_props[] = {
+ POWER_SUPPLY_PROP_STATUS, /* "FULL", "CHARGING" or "DISCHARGING". */
+ POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */
+ POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */
+};
+
+/* Note that the charger control is done by a current regulator "CHARGER" */
+static int max8997_battery_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct charger_data *charger = power_supply_get_drvdata(psy);
+ struct i2c_client *i2c = charger->iodev->i2c;
+ int ret;
+ u8 reg;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_STATUS:
+ val->intval = 0;
+ ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
+ if (ret)
+ return ret;
+ if ((reg & (1 << 0)) == 0x1)
+ val->intval = POWER_SUPPLY_STATUS_FULL;
+ else if ((reg & DCINOK_MASK))
+ val->intval = POWER_SUPPLY_STATUS_CHARGING;
+ else
+ val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+
+ break;
+ case POWER_SUPPLY_PROP_PRESENT:
+ val->intval = 0;
+ ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
+ if (ret)
+ return ret;
+ if ((reg & DETBAT_MASK) == 0x0)
+ val->intval = 1;
+
+ break;
+ case POWER_SUPPLY_PROP_ONLINE:
+ val->intval = 0;
+ ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
+ if (ret)
+ return ret;
+ if (reg & DCINOK_MASK)
+ val->intval = 1;
+
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static void max8997_battery_extcon_evt_worker(struct work_struct *work)
+{
+ struct charger_data *charger =
+ container_of(work, struct charger_data, extcon_work);
+ struct extcon_dev *edev = charger->edev;
+ int current_limit;
+
+ if (extcon_get_state(edev, EXTCON_CHG_USB_SDP) > 0) {
+ dev_dbg(charger->dev, "USB SDP charger is connected\n");
+ current_limit = 450000;
+ } else if (extcon_get_state(edev, EXTCON_CHG_USB_DCP) > 0) {
+ dev_dbg(charger->dev, "USB DCP charger is connected\n");
+ current_limit = 650000;
+ } else if (extcon_get_state(edev, EXTCON_CHG_USB_FAST) > 0) {
+ dev_dbg(charger->dev, "USB FAST charger is connected\n");
+ current_limit = 650000;
+ } else if (extcon_get_state(edev, EXTCON_CHG_USB_SLOW) > 0) {
+ dev_dbg(charger->dev, "USB SLOW charger is connected\n");
+ current_limit = 650000;
+ } else if (extcon_get_state(edev, EXTCON_CHG_USB_CDP) > 0) {
+ dev_dbg(charger->dev, "USB CDP charger is connected\n");
+ current_limit = 650000;
+ } else {
+ dev_dbg(charger->dev, "USB charger is disconnected\n");
+ current_limit = -1;
+ }
+
+ if (current_limit > 0) {
+ int ret = regulator_set_current_limit(charger->reg, current_limit, current_limit);
+
+ if (ret) {
+ dev_err(charger->dev, "failed to set current limit: %d\n", ret);
+ return;
+ }
+ ret = regulator_enable(charger->reg);
+ if (ret)
+ dev_err(charger->dev, "failed to enable regulator: %d\n", ret);
+ } else {
+ int ret = regulator_disable(charger->reg);
+
+ if (ret)
+ dev_err(charger->dev, "failed to disable regulator: %d\n", ret);
+ }
+}
+
+static int max8997_battery_extcon_evt(struct notifier_block *nb,
+ unsigned long event, void *param)
+{
+ struct charger_data *charger =
+ container_of(nb, struct charger_data, extcon_nb);
+ schedule_work(&charger->extcon_work);
+ return NOTIFY_OK;
+}
+
+static const struct power_supply_desc max8997_battery_desc = {
+ .name = "max8997_pmic",
+ .type = POWER_SUPPLY_TYPE_BATTERY,
+ .get_property = max8997_battery_get_property,
+ .properties = max8997_battery_props,
+ .num_properties = ARRAY_SIZE(max8997_battery_props),
+};
+
+static int max8997_battery_probe(struct platform_device *pdev)
+{
+ int ret = 0;
+ struct charger_data *charger;
+ struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
+ struct device_node *np = pdev->dev.of_node;
+ struct i2c_client *i2c = iodev->i2c;
+ struct max8997_platform_data *pdata = iodev->pdata;
+ struct power_supply_config psy_cfg = {};
+
+ if (!pdata) {
+ dev_err(&pdev->dev, "No platform data supplied.\n");
+ return -EINVAL;
+ }
+
+ if (pdata->eoc_mA) {
+ int val = (pdata->eoc_mA - 50) / 10;
+ if (val < 0)
+ val = 0;
+ if (val > 0xf)
+ val = 0xf;
+
+ ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL5,
+ val << ITOPOFF_SHIFT, ITOPOFF_MASK);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Cannot use i2c bus.\n");
+ return ret;
+ }
+ }
+ switch (pdata->timeout) {
+ case 5:
+ ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
+ 0x2 << TFCH_SHIFT, TFCH_MASK);
+ break;
+ case 6:
+ ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
+ 0x3 << TFCH_SHIFT, TFCH_MASK);
+ break;
+ case 7:
+ ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
+ 0x4 << TFCH_SHIFT, TFCH_MASK);
+ break;
+ case 0:
+ ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
+ 0x7 << TFCH_SHIFT, TFCH_MASK);
+ break;
+ default:
+ dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
+ pdata->timeout);
+ return -EINVAL;
+ }
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Cannot use i2c bus.\n");
+ return ret;
+ }
+
+ charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
+ if (!charger)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, charger);
+
+ charger->dev = &pdev->dev;
+ charger->iodev = iodev;
+
+ psy_cfg.drv_data = charger;
+
+ charger->battery = devm_power_supply_register(&pdev->dev,
+ &max8997_battery_desc,
+ &psy_cfg);
+ if (IS_ERR(charger->battery)) {
+ dev_err(&pdev->dev, "failed: power supply register\n");
+ return PTR_ERR(charger->battery);
+ }
+
+ // grab regulator from parent device's node
+ pdev->dev.of_node = iodev->dev->of_node;
+ charger->reg = devm_regulator_get_optional(&pdev->dev, "charger");
+ pdev->dev.of_node = np;
+ if (IS_ERR(charger->reg)) {
+ if (PTR_ERR(charger->reg) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+ dev_info(&pdev->dev, "couldn't get charger regulator\n");
+ }
+ charger->edev = extcon_get_extcon_dev("max8997-muic");
+ if (IS_ERR(charger->edev)) {
+ dev_err_probe(charger->dev, PTR_ERR(charger->edev),
+ "couldn't get extcon device: max8997-muic\n");
+ return PTR_ERR(charger->edev);
+ }
+
+ if (!IS_ERR(charger->reg) && !IS_ERR_OR_NULL(charger->edev)) {
+ ret = devm_work_autocancel(&pdev->dev, &charger->extcon_work,
+ max8997_battery_extcon_evt_worker);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to add extcon evt stop action: %d\n", ret);
+ return ret;
+ }
+ charger->extcon_nb.notifier_call = max8997_battery_extcon_evt;
+ ret = devm_extcon_register_notifier_all(&pdev->dev, charger->edev,
+ &charger->extcon_nb);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to register extcon notifier\n");
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static const struct platform_device_id max8997_battery_id[] = {
+ { "max8997-battery", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(platform, max8997_battery_id);
+
+static struct platform_driver max8997_battery_driver = {
+ .driver = {
+ .name = "max8997-battery",
+ },
+ .probe = max8997_battery_probe,
+ .id_table = max8997_battery_id,
+};
+module_platform_driver(max8997_battery_driver);
+
+MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
+MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
+MODULE_LICENSE("GPL");