[PATCH v4 10/20] power: supply: bq25890: Add support for registering the Vbus boost converter as a regulator

Hans de Goede
2022-01-30T20:47:30Z

The bq25890_charger code supports enabling/disabling the boost converter
based on usb-phy notifications. But the usb-phy framework is not used on
all boards/platforms. At support for registering the Vbus boost converter
as a standard regulator when there is no usb-phy on the board.

Also add support for providing regulator_init_data through platform_data
for use on boards where device-tree is not used and the platform code must
thus provide the regulator_init_data.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
Changes in v2:
- When the usb-phy framework is not used, turn off the Vboost regulator
on shutdown
- Some minor code-tweaks based on Andy's review
---
drivers/power/supply/bq25890_charger.c | 80 ++++++++++++++++++++++++++
include/linux/power/bq25890_charger.h | 15 +++++
2 files changed, 95 insertions(+)
create mode 100644 include/linux/power/bq25890_charger.h

diff --git a/drivers/power/supply/bq25890_charger.c b/drivers/power/supply/bq25890_charger.c
index 162bffb02410..637cdd3b6b11 100644
--- a/drivers/power/supply/bq25890_charger.c
+++ b/drivers/power/supply/bq25890_charger.c
@@ -8,7 +8,9 @@
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/power_supply.h>
+#include <linux/power/bq25890_charger.h>
#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
#include <linux/types.h>
#include <linux/gpio/consumer.h>
#include <linux/interrupt.h>
@@ -876,6 +878,45 @@ static int bq25890_usb_notifier(struct notifier_block *nb, unsigned long val,
return NOTIFY_OK;
}

+#ifdef CONFIG_REGULATOR
+static int bq25890_vbus_enable(struct regulator_dev *rdev)
+{
+ struct bq25890_device *bq = rdev_get_drvdata(rdev);
+
+ return bq25890_set_otg_cfg(bq, 1);
+}
+
+static int bq25890_vbus_disable(struct regulator_dev *rdev)
+{
+ struct bq25890_device *bq = rdev_get_drvdata(rdev);
+
+ return bq25890_set_otg_cfg(bq, 0);
+}
+
+static int bq25890_vbus_is_enabled(struct regulator_dev *rdev)
+{
+ struct bq25890_device *bq = rdev_get_drvdata(rdev);
+
+ return bq25890_field_read(bq, F_OTG_CFG);
+}
+
+static const struct regulator_ops bq25890_vbus_ops = {
+ .enable = bq25890_vbus_enable,
+ .disable = bq25890_vbus_disable,
+ .is_enabled = bq25890_vbus_is_enabled,
+};
+
+static const struct regulator_desc bq25890_vbus_desc = {
+ .name = "usb_otg_vbus",
+ .of_match = "usb-otg-vbus",
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ .ops = &bq25890_vbus_ops,
+ .fixed_uV = 5000000,
+ .n_voltages = 1,
+};
+#endif
+
static int bq25890_get_chip_version(struct bq25890_device *bq)
{
int id, rev;
@@ -1075,6 +1116,22 @@ static int bq25890_probe(struct i2c_client *client,
bq->usb_nb.notifier_call = bq25890_usb_notifier;
usb_register_notifier(bq->usb_phy, &bq->usb_nb);
}
+#ifdef CONFIG_REGULATOR
+ else {
+ struct bq25890_platform_data *pdata = dev_get_platdata(dev);
+ struct regulator_config cfg = { };
+ struct regulator_dev *reg;
+
+ cfg.dev = dev;
+ cfg.driver_data = bq;
+ if (pdata)
+ cfg.init_data = pdata->regulator_init_data;
+
+ reg = devm_regulator_register(dev, &bq25890_vbus_desc, &cfg);
+ if (IS_ERR(reg))
+ return dev_err_probe(dev, PTR_ERR(reg), "registering regulator");
+ }
+#endif

ret = bq25890_power_supply_init(bq);
if (ret < 0) {
@@ -1113,6 +1170,28 @@ static int bq25890_remove(struct i2c_client *client)
return 0;
}

+static void bq25890_shutdown(struct i2c_client *client)
+{
+ struct bq25890_device *bq = i2c_get_clientdata(client);
+
+ /*
+ * TODO this if + return should probably be removed, but that would
+ * introduce a function change for boards using the usb-phy framework.
+ * This needs to be tested on such a board before making this change.
+ */
+ if (!IS_ERR_OR_NULL(bq->usb_phy))
+ return;
+
+ /*
+ * Turn off the 5v Boost regulator which outputs Vbus to the device's
+ * Micro-USB or Type-C USB port. Leaving this on drains power and
+ * this avoids the PMIC on some device-models seeing this as Vbus
+ * getting inserted after shutdown, causing the device to immediately
+ * power-up again.
+ */
+ bq25890_set_otg_cfg(bq, 0);
+}
+
#ifdef CONFIG_PM_SLEEP
static int bq25890_suspend(struct device *dev)
{
@@ -1192,6 +1271,7 @@ static struct i2c_driver bq25890_driver = {
},
.probe = bq25890_probe,
.remove = bq25890_remove,
+ .shutdown = bq25890_shutdown,
.id_table = bq25890_i2c_ids,
};
module_i2c_driver(bq25890_driver);
diff --git a/include/linux/power/bq25890_charger.h b/include/linux/power/bq25890_charger.h
new file mode 100644
index 000000000000..c706ddb77a08
--- /dev/null
+++ b/include/linux/power/bq25890_charger.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Platform data for the TI bq25890 battery charger driver.
+ */
+
+#ifndef _BQ25890_CHARGER_H_
+#define _BQ25890_CHARGER_H_
+
+struct regulator_init_data;
+
+struct bq25890_platform_data {
+ const struct regulator_init_data *regulator_init_data;
+};
+
+#endif
--
2.33.1