On paź 24, 2018 00:34, Nishad Kamdar wrote:
> Use the gpiod interface instead of the deprecated old non-descriptor
> interface.

Hi Nishad

Few more comments from me below.

> Signed-off-by: Nishad Kamdar <nishadkam...@gmail.com>
> ---
> Changes in v3:
>  - Use a pointer to pointer for gpio_desc in
>    struct ad2s1210_gpio as it will be used to
>    modify a pointer.
>  - Use dot notation to initialize the structure.
>  - Use a pointer variable to avoid writing gpios[i].
> Changes in v2:
>  - Use the spi_device struct embedded in st instead
>    of passing it as an argument to ad2s1210_setup_gpios().
>  - Use an array of structs to reduce redundant code in
>    in ad2s1210_setup_gpios().
>  - Remove ad2s1210_free_gpios() as devm API is being used.
> ---
>  drivers/staging/iio/resolver/ad2s1210.c | 92 ++++++++++++++-----------
>  drivers/staging/iio/resolver/ad2s1210.h |  3 -
>  2 files changed, 50 insertions(+), 45 deletions(-)
> 
> diff --git a/drivers/staging/iio/resolver/ad2s1210.c 
> b/drivers/staging/iio/resolver/ad2s1210.c
> index ac13b99bd9cb..fbf0cc722979 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>
> @@ -69,10 +69,21 @@ enum ad2s1210_mode {
>  
>  static const unsigned int ad2s1210_resolution_value[] = { 10, 12, 14, 16 };
>  
> +struct ad2s1210_gpio {
> +     struct gpio_desc **ptr;
> +     const char *name;
> +     unsigned long flags;
> +};
> +
>  struct ad2s1210_state {
>       const struct ad2s1210_platform_data *pdata;
>       struct mutex lock;
>       struct spi_device *sdev;
> +     struct gpio_desc *sample;
> +     struct gpio_desc *a0;
> +     struct gpio_desc *a1;
> +     struct gpio_desc *res0;
> +     struct gpio_desc *res1;
>       unsigned int fclkin;
>       unsigned int fexcit;
>       bool hysteresis;
> @@ -91,8 +102,8 @@ 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->a0, ad2s1210_mode_vals[mode][0]);
> +     gpiod_set_value(st->a1, ad2s1210_mode_vals[mode][1]);
>       st->mode = mode;
>  }
>  
> @@ -152,8 +163,8 @@ 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->res0) << 1) |
> +                       gpiod_get_value(st->res1);
>  
>       return ad2s1210_resolution_value[resolution];
>  }
> @@ -164,10 +175,10 @@ 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->res0,
> +                     ad2s1210_res_pins[(st->resolution - 10) / 2][0]);
> +     gpiod_set_value(st->res1,
> +                     ad2s1210_res_pins[(st->resolution - 10) / 2][1]);
>  }
>  
>  static inline int ad2s1210_soft_reset(struct ad2s1210_state *st)
> @@ -401,15 +412,15 @@ 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->sample, 0);
>       /* delay (2 * tck + 20) nano seconds */
>       udelay(1);
> -     gpio_set_value(st->pdata->sample, 1);
> +     gpiod_set_value(st->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->sample, 0);
> +     gpiod_set_value(st->sample, 1);
>  error_ret:
>       mutex_unlock(&st->lock);
>  
> @@ -466,7 +477,7 @@ 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->sample, 0);
>       /* delay (6 * tck + 20) nano seconds */
>       udelay(1);
>  
> @@ -512,7 +523,7 @@ static int ad2s1210_read_raw(struct iio_dev *indio_dev,
>       }
>  
>  error_ret:
> -     gpio_set_value(st->pdata->sample, 1);
> +     gpiod_set_value(st->sample, 1);
>       /* delay (2 * tck + 20) nano seconds */
>       udelay(1);
>       mutex_unlock(&st->lock);
> @@ -630,30 +641,32 @@ 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" },
> +     int ret, i;
> +     struct spi_device *spi = st->sdev;
> +     struct ad2s1210_gpio *pin;
> +     unsigned long flags = st->pdata->gpioin ? GPIOD_IN : GPIOD_OUT_LOW;
> +
> +     struct ad2s1210_gpio gpios[] = {
> +             {.ptr = &st->sample, .name = "sample", .flags = GPIOD_IN},
> +             {.ptr = &st->a0, .name = "a0", .flags = flags},
> +             {.ptr = &st->a1, .name = "a1", .flags = flags},
> +             {.ptr = &st->res0, .name = "res0", .flags = flags},
> +             {.ptr = &st->res1, .name = "res1", .flags = flags},
>       };

I think that you should add spaces after { and before }. It's the file style
from what I see.

>  
> -     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" },
> -     };
> +     for (i = 0; i < ARRAY_SIZE(gpios); i++) {
> +             pin = &gpios[i];
> +             *pin->ptr = devm_gpiod_get(&spi->dev, pin->name,
> +                                        pin->flags);

This can now fit into one line.

> +             if (IS_ERR(pin->ptr)) {

Here you are checking the wrong pointer. Also notice the line below.

> +                     ret = PTR_ERR(pin->ptr);
> +                     dev_err(&spi->dev, "Failed to request %s GPIO: %d\n",
> +                             pin->name, ret);

Please notice how other dev_err looks like in this code. Align the message to
the existing format.

> +                     return ret;
> +             }
> +     }
>  
> -     gpio_free_array(ad2s1210_gpios, ARRAY_SIZE(ad2s1210_gpios));
> +     return 0;
>  }
>  
>  static int ad2s1210_probe(struct spi_device *spi)
> @@ -692,7 +705,7 @@ 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 +713,6 @@ 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 +720,6 @@ 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 */

-- 
Slawomir Stepien
_______________________________________________
devel mailing list
de...@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel

Reply via email to