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Date:   Sat, 3 Nov 2018 13:07:59 +0000
From:   Jonathan Cameron <jic23@jic23.retrosnub.co.uk>
To:     Nishad Kamdar <nishadkamdar@gmail.com>
Cc:     Slawomir Stepien <sst@poczta.fm>,
        Lars-Peter Clausen <lars@metafoo.de>,
        Michael Hennerich <Michael.Hennerich@analog.com>,
        Hartmut Knaack <knaack.h@gmx.de>,
        Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-iio@vger.kernel.org, devel@driverdev.osuosl.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH v7 1/3] staging: iio: ad2s1210: Switch to the gpio
 descriptor interface
Message-ID: <20181103130759.17989d92@archlinux>
In-Reply-To: <20181103124509.102204a5@archlinux>
References: <cover.1541000375.git.nishadkamdar@gmail.com>
        <1626698317a8f0b1caf5596374088f6d5b6141c9.1541000375.git.nishadkamdar@gmail.com>
        <20181103124509.102204a5@archlinux>
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On Sat, 3 Nov 2018 12:45:09 +0000
Jonathan Cameron <jic23@kernel.org> wrote:

> On Wed, 31 Oct 2018 21:28:52 +0530
> Nishad Kamdar <nishadkamdar@gmail.com> wrote:
> 
> > Use the gpiod interface instead of the deprecated old non-descriptor
> > interface.
> > 
> > Signed-off-by: Nishad Kamdar <nishadkamdar@gmail.com>  
> It would have been less 'noisy' to do these in the reverse order (drop
> the flag and support first, then do the gpiod conversion), but I suppose
> it doesn't really matter.
> 
> Applied to the togreg branch of iio.git and pushed out as testing
> for the autobuilders to play with it.
actually, couple of minor changes.
> 
> Thanks,
> 
> Jonathan
> 
> > ---
> >  drivers/staging/iio/resolver/ad2s1210.c | 106 ++++++++++++++----------
> >  drivers/staging/iio/resolver/ad2s1210.h |   3 -
> >  2 files changed, 62 insertions(+), 47 deletions(-)
> > 
> > diff --git a/drivers/staging/iio/resolver/ad2s1210.c b/drivers/staging/iio/resolver/ad2s1210.c
> > index ac13b99bd9cb..82ac9847f6f4 100644
> > --- a/drivers/staging/iio/resolver/ad2s1210.c
> > +++ b/drivers/staging/iio/resolver/ad2s1210.c
> > @@ -15,7 +15,7 @@
> >  #include <linux/slab.h>
> >  #include <linux/sysfs.h>
> >  #include <linux/delay.h>
> > -#include <linux/gpio.h>
> > +#include <linux/gpio/consumer.h>
> >  #include <linux/module.h>
> >  
> >  #include <linux/iio/iio.h>
> > @@ -67,12 +67,42 @@ enum ad2s1210_mode {
> >  	MOD_RESERVED,
> >  };
> >  
> > +enum ad2s1210_gpios {
> > +	AD2S1210_SAMPLE,
> > +	AD2S1210_A0,
> > +	AD2S1210_A1,
> > +	AD2S1210_RES0,
> > +	AD2S1210_RES1,
> > +};
> > +
> > +struct ad2s1210_gpio {
> > +	const char *name;
> > +	unsigned long flags;
> > +};
> > +
> > +static const struct ad2s1210_gpio gpios_in[] = {
> > +	[AD2S1210_SAMPLE] = { .name = "adi,sample", .flags = GPIOD_IN },
> > +	[AD2S1210_A0] = { .name = "adi,a0", .flags = GPIOD_IN },
> > +	[AD2S1210_A1] = { .name = "adi,a1", .flags = GPIOD_IN },
> > +	[AD2S1210_RES0] = { .name = "adi,res0", .flags = GPIOD_IN },
> > +	[AD2S1210_RES1] = { .name = "adi,res1", .flags = GPIOD_IN },
> > +};
> > +
> > +static const struct ad2s1210_gpio gpios_out[] = {
> > +	[AD2S1210_SAMPLE] = { .name = "adi,sample", .flags = GPIOD_OUT_LOW },
> > +	[AD2S1210_A0] = { .name = "adi,a0", .flags = GPIOD_OUT_LOW },
> > +	[AD2S1210_A1] = { .name = "adi,a1", .flags = GPIOD_OUT_LOW },
> > +	[AD2S1210_RES0] = { .name = "adi,res0", .flags = GPIOD_OUT_LOW },
> > +	[AD2S1210_RES1] = { .name = "adi,res1", .flags = GPIOD_OUT_LOW },
> > +};
> > +
> >  static const unsigned int ad2s1210_resolution_value[] = { 10, 12, 14, 16 };
> >  
> >  struct ad2s1210_state {
> >  	const struct ad2s1210_platform_data *pdata;
> >  	struct mutex lock;
> >  	struct spi_device *sdev;
> > +	struct gpio_desc *gpios[5];
> >  	unsigned int fclkin;
> >  	unsigned int fexcit;
> >  	bool hysteresis;
> > @@ -91,8 +121,8 @@ static const int ad2s1210_mode_vals[4][2] = {
> >  static inline void ad2s1210_set_mode(enum ad2s1210_mode mode,
> >  				     struct ad2s1210_state *st)
> >  {
> > -	gpio_set_value(st->pdata->a[0], ad2s1210_mode_vals[mode][0]);
> > -	gpio_set_value(st->pdata->a[1], ad2s1210_mode_vals[mode][1]);
> > +	gpiod_set_value(st->gpios[AD2S1210_A0], ad2s1210_mode_vals[mode][0]);
> > +	gpiod_set_value(st->gpios[AD2S1210_A1], ad2s1210_mode_vals[mode][1]);
> >  	st->mode = mode;
> >  }
> >  
> > @@ -152,8 +182,8 @@ int ad2s1210_update_frequency_control_word(struct ad2s1210_state *st)
> >  
> >  static unsigned char ad2s1210_read_resolution_pin(struct ad2s1210_state *st)
> >  {
> > -	int resolution = (gpio_get_value(st->pdata->res[0]) << 1) |
> > -			  gpio_get_value(st->pdata->res[1]);
> > +	int resolution = (gpiod_get_value(st->gpios[AD2S1210_RES0]) << 1) |
> > +			  gpiod_get_value(st->gpios[AD2S1210_RES1]);
> >  
> >  	return ad2s1210_resolution_value[resolution];
> >  }
> > @@ -164,10 +194,10 @@ static const int ad2s1210_res_pins[4][2] = {
> >  
> >  static inline void ad2s1210_set_resolution_pin(struct ad2s1210_state *st)
> >  {
> > -	gpio_set_value(st->pdata->res[0],
> > -		       ad2s1210_res_pins[(st->resolution - 10) / 2][0]);
> > -	gpio_set_value(st->pdata->res[1],
> > -		       ad2s1210_res_pins[(st->resolution - 10) / 2][1]);
> > +	gpiod_set_value(st->gpios[AD2S1210_RES0],
> > +			ad2s1210_res_pins[(st->resolution - 10) / 2][0]);
> > +	gpiod_set_value(st->gpios[AD2S1210_RES1],
> > +			ad2s1210_res_pins[(st->resolution - 10) / 2][1]);
> >  }
> >  
> >  static inline int ad2s1210_soft_reset(struct ad2s1210_state *st)
> > @@ -401,15 +431,15 @@ static ssize_t ad2s1210_clear_fault(struct device *dev,
> >  	int ret;
> >  
> >  	mutex_lock(&st->lock);
> > -	gpio_set_value(st->pdata->sample, 0);
> > +	gpiod_set_value(st->gpios[AD2S1210_SAMPLE], 0);
> >  	/* delay (2 * tck + 20) nano seconds */
> >  	udelay(1);
> > -	gpio_set_value(st->pdata->sample, 1);
> > +	gpiod_set_value(st->gpios[AD2S1210_SAMPLE], 1);
> >  	ret = ad2s1210_config_read(st, AD2S1210_REG_FAULT);
> >  	if (ret < 0)
> >  		goto error_ret;
> > -	gpio_set_value(st->pdata->sample, 0);
> > -	gpio_set_value(st->pdata->sample, 1);
> > +	gpiod_set_value(st->gpios[AD2S1210_SAMPLE], 0);
> > +	gpiod_set_value(st->gpios[AD2S1210_SAMPLE], 1);
> >  error_ret:
> >  	mutex_unlock(&st->lock);
> >  
> > @@ -466,7 +496,7 @@ static int ad2s1210_read_raw(struct iio_dev *indio_dev,
> >  	s16 vel;
> >  
> >  	mutex_lock(&st->lock);
> > -	gpio_set_value(st->pdata->sample, 0);
> > +	gpiod_set_value(st->gpios[AD2S1210_SAMPLE], 0);
> >  	/* delay (6 * tck + 20) nano seconds */
> >  	udelay(1);
> >  
> > @@ -512,7 +542,7 @@ static int ad2s1210_read_raw(struct iio_dev *indio_dev,
> >  	}
> >  
> >  error_ret:
> > -	gpio_set_value(st->pdata->sample, 1);
> > +	gpiod_set_value(st->gpios[AD2S1210_SAMPLE], 1);
> >  	/* delay (2 * tck + 20) nano seconds */
> >  	udelay(1);
> >  	mutex_unlock(&st->lock);
> > @@ -630,30 +660,23 @@ static const struct iio_info ad2s1210_info = {
> >  
> >  static int ad2s1210_setup_gpios(struct ad2s1210_state *st)
> >  {
> > -	unsigned long flags = st->pdata->gpioin ? GPIOF_DIR_IN : GPIOF_DIR_OUT;
> > -	struct gpio ad2s1210_gpios[] = {
> > -		{ st->pdata->sample, GPIOF_DIR_IN, "sample" },
> > -		{ st->pdata->a[0], flags, "a0" },
> > -		{ st->pdata->a[1], flags, "a1" },
> > -		{ st->pdata->res[0], flags, "res0" },
> > -		{ st->pdata->res[0], flags, "res1" },
> > -	};
> > -
> > -	return gpio_request_array(ad2s1210_gpios, ARRAY_SIZE(ad2s1210_gpios));
> > -}
> > -
> > -static void ad2s1210_free_gpios(struct ad2s1210_state *st)
> > -{
> > -	unsigned long flags = st->pdata->gpioin ? GPIOF_DIR_IN : GPIOF_DIR_OUT;
> > -	struct gpio ad2s1210_gpios[] = {
> > -		{ st->pdata->sample, GPIOF_DIR_IN, "sample" },
> > -		{ st->pdata->a[0], flags, "a0" },
> > -		{ st->pdata->a[1], flags, "a1" },
> > -		{ st->pdata->res[0], flags, "res0" },
> > -		{ st->pdata->res[0], flags, "res1" },
> > -	};
> > +	struct ad2s1210_gpio *pin = st->pdata->gpioin ? &gpios_in[0] : &gpios_out[0];
const struct ad2s1210_gpio
and the line is too long.

Fixed both.
> > +	struct spi_device *spi = st->sdev;
> > +	int i, ret;
> > +
> > +	for (i = 0; i < ARRAY_SIZE(gpios_in); i++) {
> > +		st->gpios[i] = devm_gpiod_get(&spi->dev, pin[i].name,
> > +					      pin[i].flags);
> > +		if (IS_ERR(st->gpios[i])) {
> > +			ret = PTR_ERR(st->gpios[i]);
> > +			dev_err(&spi->dev,
> > +				"ad2s1210: failed to request %s GPIO: %d\n",
> > +				pin[i].name, ret);
> > +			return ret;
> > +		}
> > +	}
> >  
> > -	gpio_free_array(ad2s1210_gpios, ARRAY_SIZE(ad2s1210_gpios));
> > +	return 0;
> >  }
> >  
> >  static int ad2s1210_probe(struct spi_device *spi)
> > @@ -692,7 +715,7 @@ static int ad2s1210_probe(struct spi_device *spi)
> >  
> >  	ret = iio_device_register(indio_dev);
> >  	if (ret)
> > -		goto error_free_gpios;
> > +		return ret;
> >  
> >  	st->fclkin = spi->max_speed_hz;
> >  	spi->mode = SPI_MODE_3;
> > @@ -700,10 +723,6 @@ static int ad2s1210_probe(struct spi_device *spi)
> >  	ad2s1210_initial(st);
> >  
> >  	return 0;
> > -
> > -error_free_gpios:
> > -	ad2s1210_free_gpios(st);
> > -	return ret;
> >  }
> >  
> >  static int ad2s1210_remove(struct spi_device *spi)
> > @@ -711,7 +730,6 @@ static int ad2s1210_remove(struct spi_device *spi)
> >  	struct iio_dev *indio_dev = spi_get_drvdata(spi);
> >  
> >  	iio_device_unregister(indio_dev);
> > -	ad2s1210_free_gpios(iio_priv(indio_dev));
> >  
> >  	return 0;
> >  }
> > diff --git a/drivers/staging/iio/resolver/ad2s1210.h b/drivers/staging/iio/resolver/ad2s1210.h
> > index e9b2147701fc..63d479b20a6c 100644
> > --- a/drivers/staging/iio/resolver/ad2s1210.h
> > +++ b/drivers/staging/iio/resolver/ad2s1210.h
> > @@ -12,9 +12,6 @@
> >  #define _AD2S1210_H
> >  
> >  struct ad2s1210_platform_data {
> > -	unsigned int		sample;
> > -	unsigned int		a[2];
> > -	unsigned int		res[2];
> >  	bool			gpioin;
> >  };
> >  #endif /* _AD2S1210_H */  
>