staging:iio:ad7606: Use GPIO descriptor API

Convert the ad7606 driver away from the deprecated legacy GPIO API and use
the new GPIO descriptor API.

This also means that the platform data struct is now empty and can be
removed.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/staging/iio/adc/ad7606.h

@@ -9,33 +9,6 @@
 #ifndef IIO_ADC_AD7606_H_
 #define IIO_ADC_AD7606_H_
 
-/*
- * TODO: struct ad7606_platform_data needs to go into include/linux/iio
- */
-
-/**
- * struct ad7606_platform_data - platform/board specific information
- * @gpio_convst:	number of gpio connected to the CONVST pin
- * @gpio_reset:		gpio connected to the RESET pin, if not used set to -1
- * @gpio_range:		gpio connected to the RANGE pin, if not used set to -1
- * @gpio_os0:		gpio connected to the OS0 pin, if not used set to -1
- * @gpio_os1:		gpio connected to the OS1 pin, if not used set to -1
- * @gpio_os2:		gpio connected to the OS2 pin, if not used set to -1
- * @gpio_frstdata:	gpio connected to the FRSTDAT pin, if not used set to -1
- * @gpio_stby:		gpio connected to the STBY pin, if not used set to -1
- */
-
-struct ad7606_platform_data {
-	unsigned int			gpio_convst;
-	unsigned int			gpio_reset;
-	unsigned int			gpio_range;
-	unsigned int			gpio_os0;
-	unsigned int			gpio_os1;
-	unsigned int			gpio_os2;
-	unsigned int			gpio_frstdata;
-	unsigned int			gpio_stby;
-};
-
 /**
  * struct ad7606_chip_info - chip specific information
  * @name:		identification string for chip
@@ -55,7 +28,6 @@ struct ad7606_chip_info {
 struct ad7606_state {
 	struct device			*dev;
 	const struct ad7606_chip_info	*chip_info;
-	struct ad7606_platform_data	*pdata;
 	struct regulator		*reg;
 	struct work_struct		poll_work;
 	wait_queue_head_t		wq_data_avail;
@@ -65,6 +37,13 @@ struct ad7606_state {
 	bool				done;
 	void __iomem			*base_address;
 
+	struct gpio_desc		*gpio_convst;
+	struct gpio_desc		*gpio_reset;
+	struct gpio_desc		*gpio_range;
+	struct gpio_desc		*gpio_standby;
+	struct gpio_desc		*gpio_frstdata;
+	struct gpio_descs		*gpio_os;
+
 	/*
 	 * DMA (thus cache coherency maintenance) requires the
 	 * transfer buffers to live in their own cache lines.

drivers/staging/iio/adc/ad7606_core.c

@@ -13,7 +13,7 @@
 #include <linux/sysfs.h>
 #include <linux/regulator/consumer.h>
 #include <linux/err.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/delay.h>
 #include <linux/sched.h>
 #include <linux/module.h>
@@ -26,10 +26,10 @@
 
 int ad7606_reset(struct ad7606_state *st)
 {
-	if (gpio_is_valid(st->pdata->gpio_reset)) {
-		gpio_set_value(st->pdata->gpio_reset, 1);
+	if (st->gpio_reset) {
+		gpiod_set_value(st->gpio_reset, 1);
 		ndelay(100); /* t_reset >= 100ns */
-		gpio_set_value(st->pdata->gpio_reset, 0);
+		gpiod_set_value(st->gpio_reset, 0);
 		return 0;
 	}
 
@@ -52,12 +52,12 @@ int ad7606_read_samples(struct ad7606_state *st)
 	 * situations.
 	 */
 
-	if (gpio_is_valid(st->pdata->gpio_frstdata)) {
+	if (st->gpio_frstdata) {
 		ret = st->bops->read_block(st->dev, 1, data);
 		if (ret)
 			return ret;
 
-		if (!gpio_get_value(st->pdata->gpio_frstdata)) {
+		if (!gpiod_get_value(st->gpio_frstdata)) {
 			ad7606_reset(st);
 			return -EIO;
 		}
@@ -75,7 +75,7 @@ static int ad7606_scan_direct(struct iio_dev *indio_dev, unsigned int ch)
 	int ret;
 
 	st->done = false;
-	gpio_set_value(st->pdata->gpio_convst, 1);
+	gpiod_set_value(st->gpio_convst, 1);
 
 	ret = wait_event_interruptible(st->wq_data_avail, st->done);
 	if (ret)
@@ -86,7 +86,7 @@ static int ad7606_scan_direct(struct iio_dev *indio_dev, unsigned int ch)
 		ret = st->data[ch];
 
 error_ret:
-	gpio_set_value(st->pdata->gpio_convst, 0);
+	gpiod_set_value(st->gpio_convst, 0);
 
 	return ret;
 }
@@ -150,7 +150,7 @@ static ssize_t ad7606_store_range(struct device *dev,
 		return -EINVAL;
 
 	mutex_lock(&indio_dev->mlock);
-	gpio_set_value(st->pdata->gpio_range, lval == 10000);
+	gpiod_set_value(st->gpio_range, lval == 10000);
 	st->range = lval;
 	mutex_unlock(&indio_dev->mlock);
 
@@ -180,6 +180,7 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
 			    long mask)
 {
 	struct ad7606_state *st = iio_priv(indio_dev);
+	int values[3];
 	int ret;
 
 	switch (mask) {
@@ -190,12 +191,16 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
 		if (ret < 0)
 			return ret;
 
+		values[0] = (ret >> 0) & 1;
+		values[1] = (ret >> 1) & 1;
+		values[2] = (ret >> 2) & 1;
+
 		mutex_lock(&indio_dev->mlock);
-		gpio_set_value(st->pdata->gpio_os0, (ret >> 0) & 1);
-		gpio_set_value(st->pdata->gpio_os1, (ret >> 1) & 1);
-		gpio_set_value(st->pdata->gpio_os2, (ret >> 2) & 1);
+		gpiod_set_array_value(ARRAY_SIZE(values), st->gpio_os->desc,
+				      values);
 		st->oversampling = val;
 		mutex_unlock(&indio_dev->mlock);
+
 		return 0;
 	default:
 		return -EINVAL;
@@ -285,119 +290,37 @@ static const struct ad7606_chip_info ad7606_chip_info_tbl[] = {
 
 static int ad7606_request_gpios(struct ad7606_state *st)
 {
-	struct gpio gpio_array[3] = {
-		[0] = {
-			.gpio =  st->pdata->gpio_os0,
-			.flags = GPIOF_DIR_OUT | ((st->oversampling & 1) ?
-				 GPIOF_INIT_HIGH : GPIOF_INIT_LOW),
-			.label = "AD7606_OS0",
-		},
-		[1] = {
-			.gpio =  st->pdata->gpio_os1,
-			.flags = GPIOF_DIR_OUT | ((st->oversampling & 2) ?
-				 GPIOF_INIT_HIGH : GPIOF_INIT_LOW),
-			.label = "AD7606_OS1",
-		},
-		[2] = {
-			.gpio =  st->pdata->gpio_os2,
-			.flags = GPIOF_DIR_OUT | ((st->oversampling & 4) ?
-				 GPIOF_INIT_HIGH : GPIOF_INIT_LOW),
-			.label = "AD7606_OS2",
-		},
-	};
-	int ret;
+	struct device *dev = st->dev;
 
-	if (gpio_is_valid(st->pdata->gpio_convst)) {
-		ret = gpio_request_one(st->pdata->gpio_convst,
-				       GPIOF_OUT_INIT_LOW,
-				       "AD7606_CONVST");
-		if (ret) {
-			dev_err(st->dev, "failed to request GPIO CONVST\n");
-			goto error_ret;
-		}
-	} else {
-		ret = -EIO;
-		goto error_ret;
-	}
+	st->gpio_convst = devm_gpiod_get(dev, "conversion-start",
+					 GPIOD_OUT_LOW);
+	if (IS_ERR(st->gpio_convst))
+		return PTR_ERR(st->gpio_convst);
 
-	if (gpio_is_valid(st->pdata->gpio_os0) &&
-	    gpio_is_valid(st->pdata->gpio_os1) &&
-	    gpio_is_valid(st->pdata->gpio_os2)) {
-		ret = gpio_request_array(gpio_array, ARRAY_SIZE(gpio_array));
-		if (ret < 0)
-			goto error_free_convst;
-	}
+	st->gpio_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(st->gpio_reset))
+		return PTR_ERR(st->gpio_reset);
 
-	if (gpio_is_valid(st->pdata->gpio_reset)) {
-		ret = gpio_request_one(st->pdata->gpio_reset,
-				       GPIOF_OUT_INIT_LOW,
-				       "AD7606_RESET");
-		if (ret < 0)
-			goto error_free_os;
-	}
+	st->gpio_range = devm_gpiod_get_optional(dev, "range", GPIOD_OUT_LOW);
+	if (IS_ERR(st->gpio_range))
+		return PTR_ERR(st->gpio_range);
 
-	if (gpio_is_valid(st->pdata->gpio_range)) {
-		ret = gpio_request_one(st->pdata->gpio_range, GPIOF_DIR_OUT |
-				       ((st->range == 10000) ? GPIOF_INIT_HIGH :
-					GPIOF_INIT_LOW), "AD7606_RANGE");
-		if (ret < 0)
-			goto error_free_reset;
-	}
-	if (gpio_is_valid(st->pdata->gpio_stby)) {
-		ret = gpio_request_one(st->pdata->gpio_stby,
-				       GPIOF_OUT_INIT_HIGH,
-				       "AD7606_STBY");
-		if (ret < 0)
-			goto error_free_range;
-	}
+	st->gpio_standby = devm_gpiod_get_optional(dev, "standby",
+						   GPIOD_OUT_HIGH);
+	if (IS_ERR(st->gpio_standby))
+		return PTR_ERR(st->gpio_standby);
 
-	if (gpio_is_valid(st->pdata->gpio_frstdata)) {
-		ret = gpio_request_one(st->pdata->gpio_frstdata, GPIOF_IN,
-				       "AD7606_FRSTDATA");
-		if (ret < 0)
-			goto error_free_stby;
-	}
+	st->gpio_frstdata = devm_gpiod_get_optional(dev, "first-data",
+						    GPIOD_IN);
+	if (IS_ERR(st->gpio_frstdata))
+		return PTR_ERR(st->gpio_frstdata);
 
-	return 0;
-
-error_free_stby:
-	if (gpio_is_valid(st->pdata->gpio_stby))
-		gpio_free(st->pdata->gpio_stby);
-error_free_range:
-	if (gpio_is_valid(st->pdata->gpio_range))
-		gpio_free(st->pdata->gpio_range);
-error_free_reset:
-	if (gpio_is_valid(st->pdata->gpio_reset))
-		gpio_free(st->pdata->gpio_reset);
-error_free_os:
-	if (gpio_is_valid(st->pdata->gpio_os0) &&
-	    gpio_is_valid(st->pdata->gpio_os1) &&
-	    gpio_is_valid(st->pdata->gpio_os2))
-		gpio_free_array(gpio_array, ARRAY_SIZE(gpio_array));
-error_free_convst:
-	gpio_free(st->pdata->gpio_convst);
-error_ret:
-	return ret;
-}
+	st->gpio_os = devm_gpiod_get_array_optional(dev, "oversampling-ratio",
+			GPIOD_OUT_LOW);
+	if (IS_ERR(st->gpio_os))
+		return PTR_ERR(st->gpio_os);
 
-static void ad7606_free_gpios(struct ad7606_state *st)
-{
-	if (gpio_is_valid(st->pdata->gpio_frstdata))
-		gpio_free(st->pdata->gpio_frstdata);
-	if (gpio_is_valid(st->pdata->gpio_stby))
-		gpio_free(st->pdata->gpio_stby);
-	if (gpio_is_valid(st->pdata->gpio_range))
-		gpio_free(st->pdata->gpio_range);
-	if (gpio_is_valid(st->pdata->gpio_reset))
-		gpio_free(st->pdata->gpio_reset);
-	if (gpio_is_valid(st->pdata->gpio_os0) &&
-	    gpio_is_valid(st->pdata->gpio_os1) &&
-	    gpio_is_valid(st->pdata->gpio_os2)) {
-		gpio_free(st->pdata->gpio_os2);
-		gpio_free(st->pdata->gpio_os1);
-		gpio_free(st->pdata->gpio_os0);
-	}
-	gpio_free(st->pdata->gpio_convst);
+	return 0;
 }
 
 /**
@@ -447,7 +370,6 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
 		 const char *name, unsigned int id,
 		 const struct ad7606_bus_ops *bops)
 {
-	struct ad7606_platform_data *pdata = dev->platform_data;
 	struct ad7606_state *st;
 	int ret;
 	struct iio_dev *indio_dev;
@@ -471,19 +393,20 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
 			return ret;
 	}
 
-	st->pdata = pdata;
+	ret = ad7606_request_gpios(st);
+	if (ret)
+		goto error_disable_reg;
+
 	st->chip_info = &ad7606_chip_info_tbl[id];
 
 	indio_dev->dev.parent = dev;
-	if (gpio_is_valid(st->pdata->gpio_os0) &&
-	    gpio_is_valid(st->pdata->gpio_os1) &&
-	    gpio_is_valid(st->pdata->gpio_os2)) {
-		if (gpio_is_valid(st->pdata->gpio_range))
+	if (st->gpio_os) {
+		if (st->gpio_range)
 			indio_dev->info = &ad7606_info_os_and_range;
 		else
 			indio_dev->info = &ad7606_info_os;
 	} else {
-		if (gpio_is_valid(st->pdata->gpio_range))
+		if (st->gpio_range)
 			indio_dev->info = &ad7606_info_range;
 		else
 			indio_dev->info = &ad7606_info_no_os_or_range;
@@ -495,10 +418,6 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
 
 	init_waitqueue_head(&st->wq_data_avail);
 
-	ret = ad7606_request_gpios(st);
-	if (ret)
-		goto error_disable_reg;
-
 	ret = ad7606_reset(st);
 	if (ret)
 		dev_warn(st->dev, "failed to RESET: no RESET GPIO specified\n");
@@ -506,7 +425,7 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
 	ret = request_irq(irq, ad7606_interrupt, IRQF_TRIGGER_FALLING, name,
 			  indio_dev);
 	if (ret)
-		goto error_free_gpios;
+		goto error_disable_reg;
 
 	ret = ad7606_register_ring_funcs_and_init(indio_dev);
 	if (ret)
@@ -525,9 +444,6 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
 error_free_irq:
 	free_irq(irq, indio_dev);
 
-error_free_gpios:
-	ad7606_free_gpios(st);
-
 error_disable_reg:
 	if (!IS_ERR(st->reg))
 		regulator_disable(st->reg);
@@ -547,8 +463,6 @@ int ad7606_remove(struct device *dev, int irq)
 	if (!IS_ERR(st->reg))
 		regulator_disable(st->reg);
 
-	ad7606_free_gpios(st);
-
 	return 0;
 }
 EXPORT_SYMBOL_GPL(ad7606_remove);
@@ -560,10 +474,9 @@ static int ad7606_suspend(struct device *dev)
 	struct iio_dev *indio_dev = dev_get_drvdata(dev);
 	struct ad7606_state *st = iio_priv(indio_dev);
 
-	if (gpio_is_valid(st->pdata->gpio_stby)) {
-		if (gpio_is_valid(st->pdata->gpio_range))
-			gpio_set_value(st->pdata->gpio_range, 1);
-		gpio_set_value(st->pdata->gpio_stby, 0);
+	if (st->gpio_standby) {
+		gpiod_set_value(st->gpio_range, 1);
+		gpiod_set_value(st->gpio_standby, 0);
 	}
 
 	return 0;
@@ -574,12 +487,9 @@ static int ad7606_resume(struct device *dev)
 	struct iio_dev *indio_dev = dev_get_drvdata(dev);
 	struct ad7606_state *st = iio_priv(indio_dev);
 
-	if (gpio_is_valid(st->pdata->gpio_stby)) {
-		if (gpio_is_valid(st->pdata->gpio_range))
-			gpio_set_value(st->pdata->gpio_range,
-				       st->range == 10000);
-
-		gpio_set_value(st->pdata->gpio_stby, 1);
+	if (st->gpio_standby) {
+		gpiod_set_value(st->gpio_range, st->range == 10000);
+		gpiod_set_value(st->gpio_standby, 1);
 		ad7606_reset(st);
 	}
 

drivers/staging/iio/adc/ad7606_ring.c

@@ -23,7 +23,7 @@ static irqreturn_t ad7606_trigger_handler(int irq, void *p)
 	struct iio_poll_func *pf = p;
 	struct ad7606_state *st = iio_priv(pf->indio_dev);
 
-	gpio_set_value(st->pdata->gpio_convst, 1);
+	gpiod_set_value(st->gpio_convst, 1);
 
 	return IRQ_HANDLED;
 }
@@ -49,7 +49,7 @@ static void ad7606_poll_bh_to_ring(struct work_struct *work_s)
 		iio_push_to_buffers_with_timestamp(indio_dev, st->data,
 						   iio_get_time_ns(indio_dev));
 
-	gpio_set_value(st->pdata->gpio_convst, 0);
+	gpiod_set_value(st->gpio_convst, 0);
 	iio_trigger_notify_done(indio_dev->trig);
 }