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SubjectRe: [PATCH V4 2/2] iio: accell: mma8452: add optional vdd/vddio regulator operation support
On Sun, 16 Dec 2018 10:46:39 +0000
Jonathan Cameron <jic23@kernel.org> wrote:

> On Tue, 11 Dec 2018 05:13:20 +0000
> Anson Huang <anson.huang@nxp.com> wrote:
>
> > The accelerometer's power supply could be controlled by regulator
> > on some platforms, such as i.MX6Q-SABRESD board, the mma8451's
> > power supply is controlled by a GPIO fixed regulator, need to make
> > sure the regulator is enabled before any communication with mma8451,
> > this patch adds optional vdd/vddio regulator operation support.
> >
> > Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
> > Acked-by: Martin Kepplinger <martink@posteo.de>
> Applied to the togreg branch of iio.git and pushed out as testing
> for the autobuilders to play with it.
Sorry again for this. I was half asleep. This one isn't
optional either, it just may not be controllable / queryable.

So please use the non optional regulator request.
If there is one specified it will wait for it to be available by
deferring. If not then it'll just provide a stub regulator so that
the rest of the code doesn't need to care.

Patches dropped for now.

Thanks,

Jonathan

>
> Thanks,
>
> Jonathan
>
> > ---
> > ChangeLog since V3:
> > - add disabling vdd regulator in vddio error path;
> > - improve regulator enable/disable sequence.
> > ---
> > drivers/iio/accel/mma8452.c | 186 +++++++++++++++++++++++++++++++++++++++++---
> > 1 file changed, 176 insertions(+), 10 deletions(-)
> >
> > diff --git a/drivers/iio/accel/mma8452.c b/drivers/iio/accel/mma8452.c
> > index 421a0a8..590a95d 100644
> > --- a/drivers/iio/accel/mma8452.c
> > +++ b/drivers/iio/accel/mma8452.c
> > @@ -31,6 +31,7 @@
> > #include <linux/of_device.h>
> > #include <linux/of_irq.h>
> > #include <linux/pm_runtime.h>
> > +#include <linux/regulator/consumer.h>
> >
> > #define MMA8452_STATUS 0x00
> > #define MMA8452_STATUS_DRDY (BIT(2) | BIT(1) | BIT(0))
> > @@ -107,6 +108,8 @@ struct mma8452_data {
> > u8 data_cfg;
> > const struct mma_chip_info *chip_info;
> > int sleep_val;
> > + struct regulator *vdd_reg;
> > + struct regulator *vddio_reg;
> > };
> >
> > /**
> > @@ -1533,10 +1536,35 @@ static int mma8452_probe(struct i2c_client *client,
> > data->client = client;
> > mutex_init(&data->lock);
> > data->chip_info = match->data;
> > + data->vdd_reg = devm_regulator_get_optional(&client->dev, "vdd");
> > + if (!IS_ERR(data->vdd_reg)) {
> > + ret = regulator_enable(data->vdd_reg);
> > + if (ret) {
> > + dev_err(&client->dev, "failed to enable VDD regulator\n");
> > + return ret;
> > + }
> > + } else {
> > + ret = PTR_ERR(data->vdd_reg);
> > + if (ret != -ENODEV)
> > + return ret;
> > + }
> > +
> > + data->vddio_reg = devm_regulator_get_optional(&client->dev, "vddio");
> > + if (!IS_ERR(data->vddio_reg)) {
> > + ret = regulator_enable(data->vddio_reg);
> > + if (ret) {
> > + dev_err(&client->dev, "failed to enable VDDIO regulator\n");
> > + goto disable_regulator_vdd;
> > + }
> > + } else {
> > + ret = PTR_ERR(data->vddio_reg);
> > + if (ret != -ENODEV)
> > + goto disable_regulator_vdd;
> > + }
> >
> > ret = i2c_smbus_read_byte_data(client, MMA8452_WHO_AM_I);
> > if (ret < 0)
> > - return ret;
> > + goto disable_regulators;
> >
> > switch (ret) {
> > case MMA8451_DEVICE_ID:
> > @@ -1549,7 +1577,8 @@ static int mma8452_probe(struct i2c_client *client,
> > break;
> > /* else: fall through */
> > default:
> > - return -ENODEV;
> > + ret = -ENODEV;
> > + goto disable_regulators;
> > }
> >
> > dev_info(&client->dev, "registering %s accelerometer; ID 0x%x\n",
> > @@ -1566,13 +1595,13 @@ static int mma8452_probe(struct i2c_client *client,
> >
> > ret = mma8452_reset(client);
> > if (ret < 0)
> > - return ret;
> > + goto disable_regulators;
> >
> > data->data_cfg = MMA8452_DATA_CFG_FS_2G;
> > ret = i2c_smbus_write_byte_data(client, MMA8452_DATA_CFG,
> > data->data_cfg);
> > if (ret < 0)
> > - return ret;
> > + goto disable_regulators;
> >
> > /*
> > * By default set transient threshold to max to avoid events if
> > @@ -1581,7 +1610,7 @@ static int mma8452_probe(struct i2c_client *client,
> > ret = i2c_smbus_write_byte_data(client, MMA8452_TRANSIENT_THS,
> > MMA8452_TRANSIENT_THS_MASK);
> > if (ret < 0)
> > - return ret;
> > + goto disable_regulators;
> >
> > if (client->irq) {
> > int irq2;
> > @@ -1595,7 +1624,7 @@ static int mma8452_probe(struct i2c_client *client,
> > MMA8452_CTRL_REG5,
> > data->chip_info->all_events);
> > if (ret < 0)
> > - return ret;
> > + goto disable_regulators;
> >
> > dev_dbg(&client->dev, "using interrupt line INT1\n");
> > }
> > @@ -1604,11 +1633,11 @@ static int mma8452_probe(struct i2c_client *client,
> > MMA8452_CTRL_REG4,
> > data->chip_info->enabled_events);
> > if (ret < 0)
> > - return ret;
> > + goto disable_regulators;
> >
> > ret = mma8452_trigger_setup(indio_dev);
> > if (ret < 0)
> > - return ret;
> > + goto disable_regulators;
> > }
> >
> > data->ctrl_reg1 = MMA8452_CTRL_ACTIVE |
> > @@ -1661,12 +1690,22 @@ static int mma8452_probe(struct i2c_client *client,
> > trigger_cleanup:
> > mma8452_trigger_cleanup(indio_dev);
> >
> > +disable_regulators:
> > + if (!IS_ERR(data->vddio_reg))
> > + regulator_disable(data->vddio_reg);
> > +
> > +disable_regulator_vdd:
> > + if (!IS_ERR(data->vdd_reg))
> > + regulator_disable(data->vdd_reg);
> > +
> > return ret;
> > }
> >
> > static int mma8452_remove(struct i2c_client *client)
> > {
> > struct iio_dev *indio_dev = i2c_get_clientdata(client);
> > + struct mma8452_data *data = iio_priv(indio_dev);
> > + int ret;
> >
> > iio_device_unregister(indio_dev);
> >
> > @@ -1678,6 +1717,21 @@ static int mma8452_remove(struct i2c_client *client)
> > mma8452_trigger_cleanup(indio_dev);
> > mma8452_standby(iio_priv(indio_dev));
> >
> > + if (!IS_ERR(data->vddio_reg)) {
> > + ret = regulator_disable(data->vddio_reg);
> > + if (ret) {
> > + dev_err(&client->dev, "failed to disable VDDIO regulator\n");
> > + return ret;
> > + }
> > + }
> > + if (!IS_ERR(data->vdd_reg)) {
> > + ret = regulator_disable(data->vdd_reg);
> > + if (ret) {
> > + dev_err(&client->dev, "failed to disable VDD regulator\n");
> > + return ret;
> > + }
> > + }
> > +
> > return 0;
> > }
> >
> > @@ -1696,6 +1750,21 @@ static int mma8452_runtime_suspend(struct device *dev)
> > return -EAGAIN;
> > }
> >
> > + if (!IS_ERR(data->vddio_reg)) {
> > + ret = regulator_disable(data->vddio_reg);
> > + if (ret) {
> > + dev_err(dev, "failed to disable VDDIO regulator\n");
> > + return ret;
> > + }
> > + }
> > + if (!IS_ERR(data->vdd_reg)) {
> > + ret = regulator_disable(data->vdd_reg);
> > + if (ret) {
> > + dev_err(dev, "failed to disable VDD regulator\n");
> > + return ret;
> > + }
> > + }
> > +
> > return 0;
> > }
> >
> > @@ -1705,6 +1774,23 @@ static int mma8452_runtime_resume(struct device *dev)
> > struct mma8452_data *data = iio_priv(indio_dev);
> > int ret, sleep_val;
> >
> > + if (!IS_ERR(data->vdd_reg)) {
> > + ret = regulator_enable(data->vdd_reg);
> > + if (ret) {
> > + dev_err(dev, "failed to enable VDD regulator\n");
> > + return ret;
> > + }
> > + }
> > + if (!IS_ERR(data->vddio_reg)) {
> > + ret = regulator_enable(data->vddio_reg);
> > + if (ret) {
> > + dev_err(dev, "failed to enable VDDIO regulator\n");
> > + if (!IS_ERR(data->vdd_reg))
> > + regulator_disable(data->vdd_reg);
> > + return ret;
> > + }
> > + }
> > +
> > ret = mma8452_active(data);
> > if (ret < 0)
> > return ret;
> > @@ -1723,14 +1809,94 @@ static int mma8452_runtime_resume(struct device *dev)
> > #ifdef CONFIG_PM_SLEEP
> > static int mma8452_suspend(struct device *dev)
> > {
> > - return mma8452_standby(iio_priv(i2c_get_clientdata(
> > + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
> > + struct mma8452_data *data = iio_priv(indio_dev);
> > + int ret;
> > +
> > + if (!IS_ERR(data->vdd_reg)) {
> > + ret = regulator_enable(data->vdd_reg);
> > + if (ret) {
> > + dev_err(dev, "failed to enable VDD regulator\n");
> > + return ret;
> > + }
> > + }
> > + if (!IS_ERR(data->vddio_reg)) {
> > + ret = regulator_enable(data->vddio_reg);
> > + if (ret) {
> > + dev_err(dev, "failed to enable VDDIO regulator\n");
> > + if (!IS_ERR(data->vdd_reg))
> > + regulator_disable(data->vdd_reg);
> > + return ret;
> > + }
> > + }
> > +
> > + ret = mma8452_standby(iio_priv(i2c_get_clientdata(
> > to_i2c_client(dev))));
> > + if (ret)
> > + return ret;
> > +
> > + if (!IS_ERR(data->vddio_reg)) {
> > + ret = regulator_disable(data->vddio_reg);
> > + if (ret) {
> > + dev_err(dev, "failed to disable VDDIO regulator\n");
> > + return ret;
> > + }
> > + }
> > + if (!IS_ERR(data->vdd_reg)) {
> > + ret = regulator_disable(data->vdd_reg);
> > + if (ret) {
> > + dev_err(dev, "failed to disable VDD regulator\n");
> > + return ret;
> > + }
> > + }
> > +
> > + return 0;
> > }
> >
> > static int mma8452_resume(struct device *dev)
> > {
> > - return mma8452_active(iio_priv(i2c_get_clientdata(
> > + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
> > + struct mma8452_data *data = iio_priv(indio_dev);
> > + int ret;
> > +
> > + if (!IS_ERR(data->vdd_reg)) {
> > + ret = regulator_enable(data->vdd_reg);
> > + if (ret) {
> > + dev_err(dev, "failed to enable VDD regulator\n");
> > + return ret;
> > + }
> > + }
> > + if (!IS_ERR(data->vddio_reg)) {
> > + ret = regulator_enable(data->vddio_reg);
> > + if (ret) {
> > + dev_err(dev, "failed to enable VDDIO regulator\n");
> > + if (!IS_ERR(data->vdd_reg))
> > + regulator_disable(data->vdd_reg);
> > + return ret;
> > + }
> > + }
> > +
> > + ret = mma8452_active(iio_priv(i2c_get_clientdata(
> > to_i2c_client(dev))));
> > + if (ret)
> > + return ret;
> > +
> > + if (!IS_ERR(data->vddio_reg)) {
> > + ret = regulator_disable(data->vddio_reg);
> > + if (ret) {
> > + dev_err(dev, "failed to disable VDDIO regulator\n");
> > + return ret;
> > + }
> > + }
> > + if (!IS_ERR(data->vdd_reg)) {
> > + ret = regulator_disable(data->vdd_reg);
> > + if (ret) {
> > + dev_err(dev, "failed to disable VDD regulator\n");
> > + return ret;
> > + }
> > + }
> > +
> > + return 0;
> > }
> > #endif
> >
>

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