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Date: Tue, 30 Apr 2024 09:31:44 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: David Lechner <dlechner@...libre.com>, Liam Girdwood
<lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
Jean Delvare <jdelvare@...e.com>, Jonathan Cameron <jic23@...nel.org>,
Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: Jonathan Corbet <corbet@....net>,
Support Opensource <support.opensource@...semi.com>,
Cosmin Tanislav <cosmin.tanislav@...log.com>,
Lars-Peter Clausen <lars@...afoo.de>,
Michael Hennerich <Michael.Hennerich@...log.com>,
Antoniu Miclaus <antoniu.miclaus@...log.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
linux-iio@...r.kernel.org, linux-staging@...ts.linux.dev,
linux-input@...r.kernel.org, Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: Re: [PATCH v2 2/7] hwmon: (adc128d818) Use
devm_regulator_get_enable_read_voltage()
On 4/29/24 16:40, David Lechner wrote:
> We can reduce boilerplate code and eliminate the driver remove()
> function by using devm_regulator_get_enable_read_voltage().
>
> A new external_vref flag is added since we no longer have the handle
> to the regulator to check if it is present.
>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Signed-off-by: David Lechner <dlechner@...libre.com>
Nit below in case you resend, otherwise
Acked-by: Guenter Roeck <linux@...ck-us.net>
> ---
>
> v2 changes:
> * rename to devm_regulator_get_enable_read_voltage()
> * use vref instead of err for return value
> * simplify last error check to return PTR_ERR directly
> ---
> drivers/hwmon/adc128d818.c | 57 ++++++++++++++--------------------------------
> 1 file changed, 17 insertions(+), 40 deletions(-)
>
> diff --git a/drivers/hwmon/adc128d818.c b/drivers/hwmon/adc128d818.c
> index 46e3c8c50765..2a35acb011eb 100644
> --- a/drivers/hwmon/adc128d818.c
> +++ b/drivers/hwmon/adc128d818.c
> @@ -58,7 +58,6 @@ static const u8 num_inputs[] = { 7, 8, 4, 6 };
>
> struct adc128_data {
> struct i2c_client *client;
> - struct regulator *regulator;
> int vref; /* Reference voltage in mV */
> struct mutex update_lock;
> u8 mode; /* Operation mode */
> @@ -389,7 +388,7 @@ static int adc128_detect(struct i2c_client *client, struct i2c_board_info *info)
> return 0;
> }
>
> -static int adc128_init_client(struct adc128_data *data)
> +static int adc128_init_client(struct adc128_data *data, bool external_vref)
> {
> struct i2c_client *client = data->client;
> int err;
> @@ -408,7 +407,7 @@ static int adc128_init_client(struct adc128_data *data)
> regval |= data->mode << 1;
>
> /* If external vref is selected, configure the chip to use it */
> - if (data->regulator)
> + if (external_vref)
> regval |= 0x01;
>
> /* Write advanced configuration register */
> @@ -430,9 +429,9 @@ static int adc128_init_client(struct adc128_data *data)
> static int adc128_probe(struct i2c_client *client)
> {
> struct device *dev = &client->dev;
> - struct regulator *regulator;
> struct device *hwmon_dev;
> struct adc128_data *data;
> + bool external_vref;
> int err, vref;
>
> data = devm_kzalloc(dev, sizeof(struct adc128_data), GFP_KERNEL);
> @@ -440,20 +439,15 @@ static int adc128_probe(struct i2c_client *client)
> return -ENOMEM;
>
> /* vref is optional. If specified, is used as chip reference voltage */
> - regulator = devm_regulator_get_optional(dev, "vref");
> - if (!IS_ERR(regulator)) {
> - data->regulator = regulator;
> - err = regulator_enable(regulator);
> - if (err < 0)
> - return err;
> - vref = regulator_get_voltage(regulator);
> - if (vref < 0) {
> - err = vref;
> - goto error;
> - }
> - data->vref = DIV_ROUND_CLOSEST(vref, 1000);
> - } else {
> + vref = devm_regulator_get_enable_read_voltage(dev, "vref");
> + if (vref == -ENODEV) {
> + external_vref = false;
> data->vref = 2560; /* 2.56V, in mV */
> + } else if (vref < 0) {
> + return vref;
> + } else {
> + external_vref = true;
> + data->vref = DIV_ROUND_CLOSEST(vref, 1000);
> }
>
> /* Operation mode is optional. If unspecified, keep current mode */
> @@ -461,13 +455,12 @@ static int adc128_probe(struct i2c_client *client)
> if (data->mode > 3) {
> dev_err(dev, "invalid operation mode %d\n",
> data->mode);
> - err = -EINVAL;
> - goto error;
> + return -EINVAL;
> }
> } else {
> err = i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV);
> if (err < 0)
> - goto error;
> + return err;
> data->mode = (err >> 1) & ADC128_REG_MASK;
> }
>
> @@ -476,31 +469,16 @@ static int adc128_probe(struct i2c_client *client)
> mutex_init(&data->update_lock);
>
> /* Initialize the chip */
> - err = adc128_init_client(data);
> + err = adc128_init_client(data, external_vref);
> if (err < 0)
> - goto error;
> + return err;
>
> hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
> data, adc128_groups);
> - if (IS_ERR(hwmon_dev)) {
> - err = PTR_ERR(hwmon_dev);
> - goto error;
> - }
> + if (IS_ERR(hwmon_dev))
> + return PTR_ERR(hwmon_dev);
>
> return 0;
return PTR_ERR_OR_ZERO(hwmon_dev);
> -
> -error:
> - if (data->regulator)
> - regulator_disable(data->regulator);
> - return err;
> -}
> -
> -static void adc128_remove(struct i2c_client *client)
> -{
> - struct adc128_data *data = i2c_get_clientdata(client);
> -
> - if (data->regulator)
> - regulator_disable(data->regulator);
> }
>
> static const struct i2c_device_id adc128_id[] = {
> @@ -522,7 +500,6 @@ static struct i2c_driver adc128_driver = {
> .of_match_table = of_match_ptr(adc128_of_match),
> },
> .probe = adc128_probe,
> - .remove = adc128_remove,
> .id_table = adc128_id,
> .detect = adc128_detect,
> .address_list = normal_i2c,
>
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