linux-kernel - Re: [PATCH 3/4] iio: adc: Add support for the GE HealthCare PMC ADC

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Message-ID: <20241002093749.17f6f239@bootlin.com>
Date: Wed, 2 Oct 2024 09:37:49 +0200
From: Herve Codina <herve.codina@...tlin.com>
To: David Lechner <dlechner@...libre.com>
Cc: Jonathan Cameron <jic23@...nel.org>, Lars-Peter Clausen
 <lars@...afoo.de>, Rob Herring <robh@...nel.org>, Krzysztof Kozlowski
 <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
 linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, Luca Ceresoli <luca.ceresoli@...tlin.com>,
 Ian Ray <ian.ray@...ealthcare.com>, Thomas Petazzoni
 <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 3/4] iio: adc: Add support for the GE HealthCare PMC ADC

Hi David,

On Tue, 1 Oct 2024 12:19:16 -0500
David Lechner <dlechner@...libre.com> wrote:

> On Tue, Oct 1, 2024 at 2:47 AM Herve Codina <herve.codina@...tlin.com> wrote:
> >
> > The GE HealthCare PMC Analog to Digital Converter (ADC) is a 16-Channel
> > (voltage and current), 16-Bit ADC with an I2C Interface.
> >
> > Signed-off-by: Herve Codina <herve.codina@...tlin.com>
> > ---  
> 
> ...
> 
> > +static int pmc_adc_read_raw_ch(struct pmc_adc *pmc_adc, u8 cmd, int *val)
> > +{
> > +       s32 ret;
> > +
> > +       ret = i2c_smbus_read_word_swapped(pmc_adc->client, cmd);
> > +       if (ret < 0) {
> > +               dev_err(&pmc_adc->client->dev, "i2c read word failed (%d)\n", ret);
> > +               return ret;
> > +       }
> > +
> > +       *val = sign_extend32(ret, 16);  
> 
> Shouldn't this be 15, not 16?

Yes, indeed, I double checked on my side and it should be 15!
Thanks for catching it. It will be fixed in the next iteration.

> 
> > +       return 0;
> > +}
> > +  
> 
> ...
> 
> > +
> > +static int pmc_adc_probe(struct i2c_client *client)
> > +{
> > +       struct iio_dev *indio_dev;
> > +       struct pmc_adc *pmc_adc;
> > +       struct clk *clk;
> > +       s32 val;
> > +       int ret;
> > +
> > +       ret = devm_regulator_bulk_get_enable(&client->dev, ARRAY_SIZE(pmc_adc_regulator_names),
> > +                                            pmc_adc_regulator_names);
> > +       if (ret)
> > +               return dev_err_probe(&client->dev, ret, "Failed to get regulators\n");
> > +
> > +       clk = devm_clk_get_optional_enabled(&client->dev, "osc");
> > +       if (IS_ERR(clk))
> > +               return dev_err_probe(&client->dev, PTR_ERR(clk), "Failed to get osc clock\n");
> > +
> > +       indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*pmc_adc));
> > +       if (!indio_dev)
> > +               return -ENOMEM;
> > +
> > +       pmc_adc = iio_priv(indio_dev);
> > +       pmc_adc->client = client;
> > +
> > +       val = i2c_smbus_read_byte_data(pmc_adc->client, PMC_ADC_CMD_REQUEST_PROTOCOL_VERSION);
> > +       if (val < 0)
> > +               return dev_err_probe(&client->dev, val, "Failed to get protocol version\n");
> > +
> > +       if (val != 0x01) {
> > +               dev_err(&client->dev, "Unsupported protocol version 0x%02x\n", val);  
> 
> Use dev_err_probe?

Yes, will be changed in the next iteration.

> 
> > +               return -EINVAL;
> > +       }
> > +

Best regards,
Hervé