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Subject[PATCH v4] staging: iio: ad2s1210: Switch to the gpio descriptor interface
Use the gpiod interface instead of the deprecated old non-descriptor
interface.

Signed-off-by: Nishad Kamdar <nishadkamdar@gmail.com>
---
Changes in v4:
- Add spaces after { and before } in gpios[]
initialization.
- Check the correct pointer for error.
- Align the dev_err msg to existing format in the code.
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..93c3c70ce62e 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 },
};

- 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);
+ if (IS_ERR(*pin->ptr)) {
+ ret = PTR_ERR(*pin->ptr);
+ dev_err(&spi->dev,
+ "ad2s1210: failed to request %s GPIO: %d\n",
+ pin->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 +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 */
--
2.17.1
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