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NFC: trf7970a: disable all regulators on removal
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During module probe, regulator 'vin' and 'vdd-io' are used and enabled,
but the vdd-io regulator overwrites the 'vin' regulator pointer. During
remove, only the vdd-io is disabled, as the vin regulator pointer is not
available anymore. When regulator_put() is called during resource
cleanup a kernel warning is given, as the regulator is still enabled.

Store the two regulators in separate pointers and disable both the
regulators on module remove.

Fixes: 49d22c7 ("NFC: trf7970a: Add device tree option of 1.8 Volt IO voltage")
Signed-off-by: Paul Geurts <paul_geurts@live.nl>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/DB7PR09MB26847A4EBF88D9EDFEB1DA0F950E2@DB7PR09MB2684.eurprd09.prod.outlook.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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@paulgeurts @kuba-moo
paulgeurts authored and kuba-moo committed Apr 22, 2024
1 parent 97ec32b commit 6bea4f0
Showing 1 changed file with 23 additions and 19 deletions.
42 changes: 23 additions & 19 deletions drivers/nfc/trf7970a.c
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Original file line number Diff line number Diff line change
Expand Up @@ -424,7 +424,8 @@ struct trf7970a {
enum trf7970a_state state;
struct device *dev;
struct spi_device *spi;
struct regulator *regulator;
struct regulator *vin_regulator;
struct regulator *vddio_regulator;
struct nfc_digital_dev *ddev;
u32 quirks;
bool is_initiator;
Expand Down Expand Up @@ -1883,7 +1884,7 @@ static int trf7970a_power_up(struct trf7970a *trf)
if (trf->state != TRF7970A_ST_PWR_OFF)
return 0;

ret = regulator_enable(trf->regulator);
ret = regulator_enable(trf->vin_regulator);
if (ret) {
dev_err(trf->dev, "%s - Can't enable VIN: %d\n", __func__, ret);
return ret;
Expand Down Expand Up @@ -1926,7 +1927,7 @@ static int trf7970a_power_down(struct trf7970a *trf)
if (trf->en2_gpiod && !(trf->quirks & TRF7970A_QUIRK_EN2_MUST_STAY_LOW))
gpiod_set_value_cansleep(trf->en2_gpiod, 0);

ret = regulator_disable(trf->regulator);
ret = regulator_disable(trf->vin_regulator);
if (ret)
dev_err(trf->dev, "%s - Can't disable VIN: %d\n", __func__,
ret);
Expand Down Expand Up @@ -2065,37 +2066,37 @@ static int trf7970a_probe(struct spi_device *spi)
mutex_init(&trf->lock);
INIT_DELAYED_WORK(&trf->timeout_work, trf7970a_timeout_work_handler);

trf->regulator = devm_regulator_get(&spi->dev, "vin");
if (IS_ERR(trf->regulator)) {
ret = PTR_ERR(trf->regulator);
trf->vin_regulator = devm_regulator_get(&spi->dev, "vin");
if (IS_ERR(trf->vin_regulator)) {
ret = PTR_ERR(trf->vin_regulator);
dev_err(trf->dev, "Can't get VIN regulator: %d\n", ret);
goto err_destroy_lock;
}

ret = regulator_enable(trf->regulator);
ret = regulator_enable(trf->vin_regulator);
if (ret) {
dev_err(trf->dev, "Can't enable VIN: %d\n", ret);
goto err_destroy_lock;
}

uvolts = regulator_get_voltage(trf->regulator);
uvolts = regulator_get_voltage(trf->vin_regulator);
if (uvolts > 4000000)
trf->chip_status_ctrl = TRF7970A_CHIP_STATUS_VRS5_3;

trf->regulator = devm_regulator_get(&spi->dev, "vdd-io");
if (IS_ERR(trf->regulator)) {
ret = PTR_ERR(trf->regulator);
trf->vddio_regulator = devm_regulator_get(&spi->dev, "vdd-io");
if (IS_ERR(trf->vddio_regulator)) {
ret = PTR_ERR(trf->vddio_regulator);
dev_err(trf->dev, "Can't get VDD_IO regulator: %d\n", ret);
goto err_destroy_lock;
goto err_disable_vin_regulator;
}

ret = regulator_enable(trf->regulator);
ret = regulator_enable(trf->vddio_regulator);
if (ret) {
dev_err(trf->dev, "Can't enable VDD_IO: %d\n", ret);
goto err_destroy_lock;
goto err_disable_vin_regulator;
}

if (regulator_get_voltage(trf->regulator) == 1800000) {
if (regulator_get_voltage(trf->vddio_regulator) == 1800000) {
trf->io_ctrl = TRF7970A_REG_IO_CTRL_IO_LOW;
dev_dbg(trf->dev, "trf7970a config vdd_io to 1.8V\n");
}
Expand All @@ -2108,7 +2109,7 @@ static int trf7970a_probe(struct spi_device *spi)
if (!trf->ddev) {
dev_err(trf->dev, "Can't allocate NFC digital device\n");
ret = -ENOMEM;
goto err_disable_regulator;
goto err_disable_vddio_regulator;
}

nfc_digital_set_parent_dev(trf->ddev, trf->dev);
Expand Down Expand Up @@ -2137,8 +2138,10 @@ static int trf7970a_probe(struct spi_device *spi)
trf7970a_shutdown(trf);
err_free_ddev:
nfc_digital_free_device(trf->ddev);
err_disable_regulator:
regulator_disable(trf->regulator);
err_disable_vddio_regulator:
regulator_disable(trf->vddio_regulator);
err_disable_vin_regulator:
regulator_disable(trf->vin_regulator);
err_destroy_lock:
mutex_destroy(&trf->lock);
return ret;
Expand All @@ -2157,7 +2160,8 @@ static void trf7970a_remove(struct spi_device *spi)
nfc_digital_unregister_device(trf->ddev);
nfc_digital_free_device(trf->ddev);

regulator_disable(trf->regulator);
regulator_disable(trf->vddio_regulator);
regulator_disable(trf->vin_regulator);

mutex_destroy(&trf->lock);
}
Expand Down

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