Input: ams_delta_serio: use IRQ resource

The driver still obtains IRQ number from a hardcoded GPIO.  Use IRQ
resource instead.

For this to work on Amstrad Delta, add the IRQ resource to
ams-delta-serio platform device structure.  Obtain the IRQ number
assigned to "keybrd_clk" GPIO pin from FIQ initialization routine.

As a benefit, the driver no longer needs to include
<mach/board-ams-delta.h>.

Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap1/ams-delta-fiq.c

@@ -20,6 +20,7 @@
 #include <linux/module.h>
 #include <linux/io.h>
 #include <linux/platform_data/ams-delta-fiq.h>
+#include <linux/platform_device.h>
 
 #include <mach/board-ams-delta.h>
 
@@ -84,7 +85,8 @@ static irqreturn_t deferred_fiq(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-void __init ams_delta_init_fiq(struct gpio_chip *chip)
+void __init ams_delta_init_fiq(struct gpio_chip *chip,
+			       struct platform_device *serio)
 {
 	struct gpio_desc *gpiod, *data = NULL, *clk = NULL;
 	void *fiqhandler_start;
@@ -201,6 +203,22 @@ void __init ams_delta_init_fiq(struct gpio_chip *chip)
 	val = omap_readl(OMAP_IH1_BASE + offset) | 1;
 	omap_writel(val, OMAP_IH1_BASE + offset);
 
+	/* Initialize serio device IRQ resource */
+	serio->resource[0].start = gpiod_to_irq(clk);
+	serio->resource[0].end = serio->resource[0].start;
+
+	/*
+	 * Since FIQ handler performs handling of GPIO registers for
+	 * "keybrd_clk" IRQ pin, ams_delta_serio driver used to set
+	 * handle_simple_irq() as active IRQ handler for that pin to avoid
+	 * bad interaction with gpio-omap driver.  This is no longer needed
+	 * as handle_simple_irq() is now the default handler for OMAP GPIO
+	 * edge interrupts.
+	 * This comment replaces the obsolete code which has been removed
+	 * from the ams_delta_serio driver and stands here only as a reminder
+	 * of that dependency on gpio-omap driver behavior.
+	 */
+
 	return;
 
 out_gpio:

arch/arm/mach-omap1/ams-delta-fiq.h

@@ -35,7 +35,8 @@
 #ifndef __ASSEMBLER__
 extern unsigned char qwerty_fiqin_start, qwerty_fiqin_end;
 
-extern void __init ams_delta_init_fiq(struct gpio_chip *chip);
+extern void __init ams_delta_init_fiq(struct gpio_chip *chip,
+				      struct platform_device *pdev);
 #endif
 
 #endif

arch/arm/mach-omap1/board-ams-delta.c

@@ -521,9 +521,24 @@ static struct platform_device cx20442_codec_device = {
 	.id     = -1,
 };
 
+static struct resource ams_delta_serio_resources[] = {
+	{
+		.flags	= IORESOURCE_IRQ,
+		/*
+		 * Initialize IRQ resource with invalid IRQ number.
+		 * It will be replaced with dynamically allocated GPIO IRQ
+		 * obtained from GPIO chip as soon as the chip is available.
+		 */
+		.start	= -EINVAL,
+		.end	= -EINVAL,
+	},
+};
+
 static struct platform_device ams_delta_serio_device = {
 	.name		= "ams-delta-serio",
 	.id		= PLATFORM_DEVID_NONE,
+	.num_resources	= ARRAY_SIZE(ams_delta_serio_resources),
+	.resource	= ams_delta_serio_resources,
 };
 
 static struct regulator_consumer_supply keybrd_pwr_consumers[] = {
@@ -632,7 +647,7 @@ static void __init omap_gpio_deps_init(void)
 		return;
 	}
 
-	ams_delta_init_fiq(chip);
+	ams_delta_init_fiq(chip, &ams_delta_serio_device);
 }
 
 static void __init ams_delta_init(void)

drivers/input/serio/ams_delta_serio.c

@@ -20,7 +20,6 @@
  * However, when used with the E3 mailboard that producecs non-standard
  * scancodes, a custom key table must be prepared and loaded from userspace.
  */
-#include <linux/gpio.h>
 #include <linux/irq.h>
 #include <linux/platform_data/ams-delta-fiq.h>
 #include <linux/platform_device.h>
@@ -29,8 +28,6 @@
 #include <linux/slab.h>
 #include <linux/module.h>
 
-#include <mach/board-ams-delta.h>
-
 #define DRIVER_NAME	"ams-delta-serio"
 
 MODULE_AUTHOR("Matt Callow");
@@ -113,7 +110,7 @@ static int ams_delta_serio_init(struct platform_device *pdev)
 {
 	struct ams_delta_serio *priv;
 	struct serio *serio;
-	int err;
+	int irq, err;
 
 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
@@ -139,26 +136,20 @@ static int ams_delta_serio_init(struct platform_device *pdev)
 		return err;
 	}
 
-	err = request_irq(gpio_to_irq(AMS_DELTA_GPIO_PIN_KEYBRD_CLK),
-			ams_delta_serio_interrupt, IRQ_TYPE_EDGE_RISING,
-			DRIVER_NAME, priv);
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return -ENXIO;
+
+	err = devm_request_irq(&pdev->dev, irq, ams_delta_serio_interrupt,
+			       IRQ_TYPE_EDGE_RISING, DRIVER_NAME, priv);
 	if (err < 0) {
 		dev_err(&pdev->dev, "IRQ request failed (%d)\n", err);
 		return err;
 	}
-	/*
-	 * Since GPIO register handling for keyboard clock pin is performed
-	 * at FIQ level, switch back from edge to simple interrupt handler
-	 * to avoid bad interaction.
-	 */
-	irq_set_handler(gpio_to_irq(AMS_DELTA_GPIO_PIN_KEYBRD_CLK),
-			handle_simple_irq);
 
 	serio = kzalloc(sizeof(*serio), GFP_KERNEL);
-	if (!serio) {
-		err = -ENOMEM;
-		goto irq;
-	}
+	if (!serio)
+		return -ENOMEM;
 
 	priv->serio = serio;
 
@@ -177,10 +168,6 @@ static int ams_delta_serio_init(struct platform_device *pdev)
 	dev_info(&serio->dev, "%s\n", serio->name);
 
 	return 0;
-
-irq:
-	free_irq(gpio_to_irq(AMS_DELTA_GPIO_PIN_KEYBRD_CLK), priv);
-	return err;
 }
 
 static int ams_delta_serio_exit(struct platform_device *pdev)
@@ -188,7 +175,6 @@ static int ams_delta_serio_exit(struct platform_device *pdev)
 	struct ams_delta_serio *priv = platform_get_drvdata(pdev);
 
 	serio_unregister_port(priv->serio);
-	free_irq(gpio_to_irq(AMS_DELTA_GPIO_PIN_KEYBRD_CLK), 0);
 
 	return 0;
 }