input: serio: ams-delta: toggle keyboard power over GPIO

Don't use Amstrad Delta custom I/O functions once GPIO interface is
available for the underlying hardware.

While requesting and initializing GPIO pins used, also take care of one
extra pin KEYBRD_DATAOUT which, even if not used by the driver, belongs
to the device and affects its functioning.

Once done, move the driver initialization back to the device_initcall
level, reverting the temporary chane introduced with patch 1/7 "ARM:
OMAP1: ams-delta: register latch dependent devices later".  That change
is no longer required once the driver takes care of registering used
GPIO pins, and it's better to initialize the device before others using
the latch2 based GPIO pins, otherwise a garbage is reported on boot,
perhaps due to random data already captured by the FIQ handler while the
keyboard related latch bits are written with random values during
initialization of those other latch2 dependent devices.

Signed-off-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
[tony@atomide.com: renamed _gpios to ams_delta_gpios]
Signed-off-by: Tony Lindgren <tony@atomide.com>

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

@@ -226,16 +226,6 @@ static struct gpio latch_gpios[] __initconst = {
 		.flags	= GPIOF_OUT_INIT_LOW,
 		.label	= "dockit2",
 	},
-	{
-		.gpio	= AMS_DELTA_GPIO_PIN_KEYBRD_PWR,
-		.flags	= GPIOF_OUT_INIT_LOW,
-		.label	= "keybrd_pwr",
-	},
-	{
-		.gpio	= AMS_DELTA_GPIO_PIN_KEYBRD_DATAOUT,
-		.flags	= GPIOF_OUT_INIT_LOW,
-		.label	= "keybrd_dataout",
-	},
 	{
 		.gpio	= AMS_DELTA_GPIO_PIN_SCARD_RSTIN,
 		.flags	= GPIOF_OUT_INIT_LOW,

arch/arm/plat-omap/include/plat/board-ams-delta.h

@@ -28,8 +28,6 @@
 
 #if defined (CONFIG_MACH_AMS_DELTA)
 
-#define AMD_DELTA_LATCH2_KEYBRD_PWR	0x0100
-#define AMD_DELTA_LATCH2_KEYBRD_DATA	0x0200
 #define AMD_DELTA_LATCH2_SCARD_RSTIN	0x0400
 #define AMD_DELTA_LATCH2_SCARD_CMDVCC	0x0800
 #define AMS_DELTA_LATCH2_MODEM_NRESET	0x1000

drivers/input/serio/ams_delta_serio.c

@@ -92,18 +92,40 @@ static irqreturn_t ams_delta_serio_interrupt(int irq, void *dev_id)
 static int ams_delta_serio_open(struct serio *serio)
 {
 	/* enable keyboard */
-	ams_delta_latch2_write(AMD_DELTA_LATCH2_KEYBRD_PWR,
-			AMD_DELTA_LATCH2_KEYBRD_PWR);
+	gpio_set_value(AMS_DELTA_GPIO_PIN_KEYBRD_PWR, 1);
 
 	return 0;
 }
 
 static void ams_delta_serio_close(struct serio *serio)
 {
 	/* disable keyboard */
-	ams_delta_latch2_write(AMD_DELTA_LATCH2_KEYBRD_PWR, 0);
+	gpio_set_value(AMS_DELTA_GPIO_PIN_KEYBRD_PWR, 0);
 }
 
+static struct gpio ams_delta_gpios[] __initconst_or_module = {
+	{
+		.gpio	= AMS_DELTA_GPIO_PIN_KEYBRD_DATA,
+		.flags	= GPIOF_DIR_IN,
+		.label	= "serio-data",
+	},
+	{
+		.gpio	= AMS_DELTA_GPIO_PIN_KEYBRD_CLK,
+		.flags	= GPIOF_DIR_IN,
+		.label	= "serio-clock",
+	},
+	{
+		.gpio	= AMS_DELTA_GPIO_PIN_KEYBRD_PWR,
+		.flags	= GPIOF_OUT_INIT_LOW,
+		.label	= "serio-power",
+	},
+	{
+		.gpio	= AMS_DELTA_GPIO_PIN_KEYBRD_DATAOUT,
+		.flags	= GPIOF_OUT_INIT_LOW,
+		.label	= "serio-dataout",
+	},
+};
+
 static int __init ams_delta_serio_init(void)
 {
 	int err;
@@ -123,27 +145,20 @@ static int __init ams_delta_serio_init(void)
 	strlcpy(ams_delta_serio->phys, "GPIO/serio0",
 			sizeof(ams_delta_serio->phys));
 
-	err = gpio_request(AMS_DELTA_GPIO_PIN_KEYBRD_DATA, "serio-data");
+	err = gpio_request_array(ams_delta_gpios,
+				ARRAY_SIZE(ams_delta_gpios));
 	if (err) {
-		pr_err("ams_delta_serio: Couldn't request gpio pin for data\n");
+		pr_err("ams_delta_serio: Couldn't request gpio pins\n");
 		goto serio;
 	}
-	gpio_direction_input(AMS_DELTA_GPIO_PIN_KEYBRD_DATA);
-
-	err = gpio_request(AMS_DELTA_GPIO_PIN_KEYBRD_CLK, "serio-clock");
-	if (err) {
-		pr_err("ams_delta_serio: couldn't request gpio pin for clock\n");
-		goto gpio_data;
-	}
-	gpio_direction_input(AMS_DELTA_GPIO_PIN_KEYBRD_CLK);
 
 	err = request_irq(gpio_to_irq(AMS_DELTA_GPIO_PIN_KEYBRD_CLK),
 			ams_delta_serio_interrupt, IRQ_TYPE_EDGE_RISING,
 			"ams-delta-serio", 0);
 	if (err < 0) {
 		pr_err("ams_delta_serio: couldn't request gpio interrupt %d\n",
 				gpio_to_irq(AMS_DELTA_GPIO_PIN_KEYBRD_CLK));
-		goto gpio_clk;
+		goto gpio;
 	}
 	/*
 	 * Since GPIO register handling for keyboard clock pin is performed
@@ -157,21 +172,20 @@ static int __init ams_delta_serio_init(void)
 	dev_info(&ams_delta_serio->dev, "%s\n", ams_delta_serio->name);
 
 	return 0;
-gpio_clk:
-	gpio_free(AMS_DELTA_GPIO_PIN_KEYBRD_CLK);
-gpio_data:
-	gpio_free(AMS_DELTA_GPIO_PIN_KEYBRD_DATA);
+gpio:
+	gpio_free_array(ams_delta_gpios,
+			ARRAY_SIZE(ams_delta_gpios));
 serio:
 	kfree(ams_delta_serio);
 	return err;
 }
-late_initcall(ams_delta_serio_init);
+module_init(ams_delta_serio_init);
 
 static void __exit ams_delta_serio_exit(void)
 {
 	serio_unregister_port(ams_delta_serio);
 	free_irq(OMAP_GPIO_IRQ(AMS_DELTA_GPIO_PIN_KEYBRD_CLK), 0);
-	gpio_free(AMS_DELTA_GPIO_PIN_KEYBRD_CLK);
-	gpio_free(AMS_DELTA_GPIO_PIN_KEYBRD_DATA);
+	gpio_free_array(ams_delta_gpios,
+			ARRAY_SIZE(ams_delta_gpios));
 }
 module_exit(ams_delta_serio_exit);