[PATCH RESEND 12/14] gpio: grgpio: use new generic GPIO chip API

[Bartosz Golaszewski <brgl@bgdev.pl>]

From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Convert the driver to using the new generic GPIO chip interfaces from
linux/gpio/generic.h.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
 drivers/gpio/gpio-grgpio.c | 87 +++++++++++++++++++++++-----------------------
 1 file changed, 44 insertions(+), 43 deletions(-)

diff --git a/drivers/gpio/gpio-grgpio.c b/drivers/gpio/gpio-grgpio.c
index f3f8bab62f94cefb69d31d76b961ab2d346df49e..3b77fad00749cd5218268b267b5848515c6a26fc 100644
--- a/drivers/gpio/gpio-grgpio.c
+++ b/drivers/gpio/gpio-grgpio.c
@@ -19,6 +19,7 @@
 #include <linux/bitops.h>
 #include <linux/err.h>
 #include <linux/gpio/driver.h>
+#include <linux/gpio/generic.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
@@ -59,7 +60,7 @@ struct grgpio_lirq {
 };
 
 struct grgpio_priv {
-	struct gpio_chip gc;
+	struct gpio_generic_chip chip;
 	void __iomem *regs;
 	struct device *dev;
 
@@ -91,13 +92,12 @@ struct grgpio_priv {
 static void grgpio_set_imask(struct grgpio_priv *priv, unsigned int offset,
 			     int val)
 {
-	struct gpio_chip *gc = &priv->gc;
-
 	if (val)
 		priv->imask |= BIT(offset);
 	else
 		priv->imask &= ~BIT(offset);
-	gc->write_reg(priv->regs + GRGPIO_IMASK, priv->imask);
+
+	gpio_generic_write_reg(&priv->chip, priv->regs + GRGPIO_IMASK, priv->imask);
 }
 
 static int grgpio_to_irq(struct gpio_chip *gc, unsigned offset)
@@ -118,7 +118,6 @@ static int grgpio_to_irq(struct gpio_chip *gc, unsigned offset)
 static int grgpio_irq_set_type(struct irq_data *d, unsigned int type)
 {
 	struct grgpio_priv *priv = irq_data_get_irq_chip_data(d);
-	unsigned long flags;
 	u32 mask = BIT(d->hwirq);
 	u32 ipol;
 	u32 iedge;
@@ -146,15 +145,13 @@ static int grgpio_irq_set_type(struct irq_data *d, unsigned int type)
 		return -EINVAL;
 	}
 
-	raw_spin_lock_irqsave(&priv->gc.bgpio_lock, flags);
+	guard(gpio_generic_lock_irqsave)(&priv->chip);
 
-	ipol = priv->gc.read_reg(priv->regs + GRGPIO_IPOL) & ~mask;
-	iedge = priv->gc.read_reg(priv->regs + GRGPIO_IEDGE) & ~mask;
+	ipol = gpio_generic_read_reg(&priv->chip, priv->regs + GRGPIO_IPOL) & ~mask;
+	iedge = gpio_generic_read_reg(&priv->chip, priv->regs + GRGPIO_IEDGE) & ~mask;
 
-	priv->gc.write_reg(priv->regs + GRGPIO_IPOL, ipol | pol);
-	priv->gc.write_reg(priv->regs + GRGPIO_IEDGE, iedge | edge);
-
-	raw_spin_unlock_irqrestore(&priv->gc.bgpio_lock, flags);
+	gpio_generic_write_reg(&priv->chip, priv->regs + GRGPIO_IPOL, ipol | pol);
+	gpio_generic_write_reg(&priv->chip, priv->regs + GRGPIO_IEDGE, iedge | edge);
 
 	return 0;
 }
@@ -163,29 +160,23 @@ static void grgpio_irq_mask(struct irq_data *d)
 {
 	struct grgpio_priv *priv = irq_data_get_irq_chip_data(d);
 	int offset = d->hwirq;
-	unsigned long flags;
 
-	raw_spin_lock_irqsave(&priv->gc.bgpio_lock, flags);
+	scoped_guard(gpio_generic_lock_irqsave, &priv->chip)
+		grgpio_set_imask(priv, offset, 0);
 
-	grgpio_set_imask(priv, offset, 0);
-
-	raw_spin_unlock_irqrestore(&priv->gc.bgpio_lock, flags);
-
-	gpiochip_disable_irq(&priv->gc, d->hwirq);
+	gpiochip_disable_irq(&priv->chip.gc, d->hwirq);
 }
 
 static void grgpio_irq_unmask(struct irq_data *d)
 {
 	struct grgpio_priv *priv = irq_data_get_irq_chip_data(d);
 	int offset = d->hwirq;
-	unsigned long flags;
 
-	gpiochip_enable_irq(&priv->gc, d->hwirq);
-	raw_spin_lock_irqsave(&priv->gc.bgpio_lock, flags);
+	gpiochip_enable_irq(&priv->chip.gc, d->hwirq);
+
+	guard(gpio_generic_lock_irqsave)(&priv->chip);
 
 	grgpio_set_imask(priv, offset, 1);
-
-	raw_spin_unlock_irqrestore(&priv->gc.bgpio_lock, flags);
 }
 
 static const struct irq_chip grgpio_irq_chip = {
@@ -200,12 +191,11 @@ static const struct irq_chip grgpio_irq_chip = {
 static irqreturn_t grgpio_irq_handler(int irq, void *dev)
 {
 	struct grgpio_priv *priv = dev;
-	int ngpio = priv->gc.ngpio;
-	unsigned long flags;
+	int ngpio = priv->chip.gc.ngpio;
 	int i;
 	int match = 0;
 
-	raw_spin_lock_irqsave(&priv->gc.bgpio_lock, flags);
+	guard(gpio_generic_lock_irqsave)(&priv->chip);
 
 	/*
 	 * For each gpio line, call its interrupt handler if it its underlying
@@ -221,8 +211,6 @@ static irqreturn_t grgpio_irq_handler(int irq, void *dev)
 		}
 	}
 
-	raw_spin_unlock_irqrestore(&priv->gc.bgpio_lock, flags);
-
 	if (!match)
 		dev_warn(priv->dev, "No gpio line matched irq %d\n", irq);
 
@@ -253,13 +241,18 @@ static int grgpio_irq_map(struct irq_domain *d, unsigned int irq,
 	dev_dbg(priv->dev, "Mapping irq %d for gpio line %d\n",
 		irq, offset);
 
-	raw_spin_lock_irqsave(&priv->gc.bgpio_lock, flags);
+	gpio_generic_chip_lock_irqsave(&priv->chip, flags);
 
 	/* Request underlying irq if not already requested */
 	lirq->irq = irq;
 	uirq = &priv->uirqs[lirq->index];
 	if (uirq->refcnt == 0) {
-		raw_spin_unlock_irqrestore(&priv->gc.bgpio_lock, flags);
+		/*
+		 * FIXME: This is not how locking works at all, you can't just
+		 * release the lock for a moment to do something that can't
+		 * sleep...
+		 */
+		gpio_generic_chip_unlock_irqrestore(&priv->chip, flags);
 		ret = request_irq(uirq->uirq, grgpio_irq_handler, 0,
 				  dev_name(priv->dev), priv);
 		if (ret) {
@@ -268,11 +261,11 @@ static int grgpio_irq_map(struct irq_domain *d, unsigned int irq,
 				uirq->uirq);
 			return ret;
 		}
-		raw_spin_lock_irqsave(&priv->gc.bgpio_lock, flags);
+		gpio_generic_chip_lock_irqsave(&priv->chip, flags);
 	}
 	uirq->refcnt++;
 
-	raw_spin_unlock_irqrestore(&priv->gc.bgpio_lock, flags);
+	gpio_generic_chip_unlock_irqrestore(&priv->chip, flags);
 
 	/* Setup irq  */
 	irq_set_chip_data(irq, priv);
@@ -290,13 +283,13 @@ static void grgpio_irq_unmap(struct irq_domain *d, unsigned int irq)
 	struct grgpio_lirq *lirq;
 	struct grgpio_uirq *uirq;
 	unsigned long flags;
-	int ngpio = priv->gc.ngpio;
+	int ngpio = priv->chip.gc.ngpio;
 	int i;
 
 	irq_set_chip_and_handler(irq, NULL, NULL);
 	irq_set_chip_data(irq, NULL);
 
-	raw_spin_lock_irqsave(&priv->gc.bgpio_lock, flags);
+	gpio_generic_chip_lock_irqsave(&priv->chip, flags);
 
 	/* Free underlying irq if last user unmapped */
 	index = -1;
@@ -315,13 +308,13 @@ static void grgpio_irq_unmap(struct irq_domain *d, unsigned int irq)
 		uirq = &priv->uirqs[lirq->index];
 		uirq->refcnt--;
 		if (uirq->refcnt == 0) {
-			raw_spin_unlock_irqrestore(&priv->gc.bgpio_lock, flags);
+			gpio_generic_chip_unlock_irqrestore(&priv->chip, flags);
 			free_irq(uirq->uirq, priv);
 			return;
 		}
 	}
 
-	raw_spin_unlock_irqrestore(&priv->gc.bgpio_lock, flags);
+	gpio_generic_chip_unlock_irqrestore(&priv->chip, flags);
 }
 
 static void grgpio_irq_domain_remove(void *data)
@@ -341,6 +334,7 @@ static const struct irq_domain_ops grgpio_irq_domain_ops = {
 static int grgpio_probe(struct platform_device *ofdev)
 {
 	struct device_node *np = ofdev->dev.of_node;
+	struct gpio_generic_chip_config config;
 	struct device *dev = &ofdev->dev;
 	void  __iomem *regs;
 	struct gpio_chip *gc;
@@ -359,17 +353,24 @@ static int grgpio_probe(struct platform_device *ofdev)
 	if (IS_ERR(regs))
 		return PTR_ERR(regs);
 
-	gc = &priv->gc;
-	err = bgpio_init(gc, dev, 4, regs + GRGPIO_DATA,
-			 regs + GRGPIO_OUTPUT, NULL, regs + GRGPIO_DIR, NULL,
-			 BGPIOF_BIG_ENDIAN_BYTE_ORDER);
+	config = (typeof(config)){
+		.dev = dev,
+		.sz = 4,
+		.dat = regs + GRGPIO_DATA,
+		.set = regs + GRGPIO_OUTPUT,
+		.dirout = regs + GRGPIO_DIR,
+		.flags = BGPIOF_BIG_ENDIAN_BYTE_ORDER,
+	};
+
+	gc = &priv->chip.gc;
+	err = gpio_generic_chip_init(&priv->chip, &config);
 	if (err) {
-		dev_err(dev, "bgpio_init() failed\n");
+		dev_err(dev, "failed to initialize the generic GPIO chip\n");
 		return err;
 	}
 
 	priv->regs = regs;
-	priv->imask = gc->read_reg(regs + GRGPIO_IMASK);
+	priv->imask = gpio_generic_read_reg(&priv->chip, regs + GRGPIO_IMASK);
 	priv->dev = dev;
 
 	gc->owner = THIS_MODULE;

-- 
2.48.1