[RESEND/PATCHv2] Input: omap-keypad: dynamically handle register offsets

[Sourav Poddar <sourav.poddar@ti.com>]

From: G, Manjunath Kondaiah <manjugk@ti.com>

Keypad controller register offsets are different for omap4
and omap5. Handle these offsets through static mapping and
assign these mappings during run time.

Tested on omap4430 sdp with 3.4-rc3.
Tested on omap5430evm with 3.1-custom kernel.

Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: G, Manjunath Kondaiah <manjugk@ti.com>
Signed-off-by: Sourav Poddar <sourav.poddar@ti.com>
---
Changes since v1:
- Fix Felipe's comment about getting rid 
  of one argument from irqstatus/irqenable api 
- Fix Dmitry's comment:
  - get rid of revision check in readl/writel
  - Relace ENODEV with proper macro.
  - Use switch statement  
 drivers/input/keyboard/Kconfig        |    6 +-
 drivers/input/keyboard/omap4-keypad.c |  115 ++++++++++++++++++++++++++-------
 2 files changed, 95 insertions(+), 26 deletions(-)

diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index f354813..9a0e1a9 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -511,10 +511,10 @@ config KEYBOARD_OMAP
 	  To compile this driver as a module, choose M here: the
 	  module will be called omap-keypad.
 
-config KEYBOARD_OMAP4
-	tristate "TI OMAP4 keypad support"
+config KEYBOARD_OMAP4+
+	tristate "TI OMAP4+ keypad support"
 	help
-	  Say Y here if you want to use the OMAP4 keypad.
+	  Say Y here if you want to use the OMAP4+ keypad.
 
 	  To compile this driver as a module, choose M here: the
 	  module will be called omap4-keypad.
diff --git a/drivers/input/keyboard/omap4-keypad.c b/drivers/input/keyboard/omap4-keypad.c
index e809ac0..8e46563 100644
--- a/drivers/input/keyboard/omap4-keypad.c
+++ b/drivers/input/keyboard/omap4-keypad.c
@@ -68,6 +68,11 @@
 
 #define OMAP4_MASK_IRQSTATUSDISABLE	0xFFFF
 
+enum {
+	KBD_REVISION_OMAP4 = 0,
+	KBD_REVISION_OMAP5,
+};
+
 struct omap4_keypad {
 	struct input_dev *input;
 
@@ -76,11 +81,61 @@ struct omap4_keypad {
 
 	unsigned int rows;
 	unsigned int cols;
+	unsigned int revision;
+	u32 irqstatus;
+	u32 irqenable;
+	u32 reg_offset;
 	unsigned int row_shift;
 	unsigned char key_state[8];
 	unsigned short keymap[];
 };
 
+static int kbd_read_irqstatus(struct omap4_keypad *keypad_data, u32 offset)
+{
+	return __raw_readl(keypad_data->base + offset);
+}
+
+static int kbd_write_irqstatus(struct omap4_keypad *keypad_data,
+						u32 value)
+{
+	return __raw_writel(value, keypad_data->base + keypad_data->irqstatus);
+}
+
+static int kbd_write_irqenable(struct omap4_keypad *keypad_data,
+						u32 value)
+{
+	return __raw_writel(value, keypad_data->base + keypad_data->irqenable);
+}
+
+static int kbd_readl(struct omap4_keypad *keypad_data, u32 offset)
+{
+	return __raw_readl(keypad_data->base +
+			keypad_data->reg_offset + offset);
+}
+
+static void kbd_writel(struct omap4_keypad *keypad_data, u32 offset, u32 value)
+{
+	__raw_writel(value, keypad_data->base +
+			keypad_data->reg_offset + offset);
+}
+
+static int kbd_read_revision(struct omap4_keypad *keypad_data, u32 offset)
+{
+	int reg;
+	reg = __raw_readl(keypad_data->base + offset);
+	reg &= 0x03 << 30;
+	reg >>= 30;
+
+	switch (reg) {
+	case 1:
+		return KBD_REVISION_OMAP5;
+	case 0:
+		return KBD_REVISION_OMAP4;
+	default:
+		return -EINVAL;
+	}
+}
+
 /* Interrupt handler */
 static irqreturn_t omap4_keypad_interrupt(int irq, void *dev_id)
 {
@@ -91,12 +146,10 @@ static irqreturn_t omap4_keypad_interrupt(int irq, void *dev_id)
 	u32 *new_state = (u32 *) key_state;
 
 	/* Disable interrupts */
-	__raw_writel(OMAP4_VAL_IRQDISABLE,
-		     keypad_data->base + OMAP4_KBD_IRQENABLE);
+	kbd_write_irqenable(keypad_data, OMAP4_VAL_IRQDISABLE);
 
-	*new_state = __raw_readl(keypad_data->base + OMAP4_KBD_FULLCODE31_0);
-	*(new_state + 1) = __raw_readl(keypad_data->base
-						+ OMAP4_KBD_FULLCODE63_32);
+	*new_state = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE31_0);
+	*(new_state + 1) = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE63_32);
 
 	for (row = 0; row < keypad_data->rows; row++) {
 		changed = key_state[row] ^ keypad_data->key_state[row];
@@ -121,12 +174,12 @@ static irqreturn_t omap4_keypad_interrupt(int irq, void *dev_id)
 		sizeof(keypad_data->key_state));
 
 	/* clear pending interrupts */
-	__raw_writel(__raw_readl(keypad_data->base + OMAP4_KBD_IRQSTATUS),
-			keypad_data->base + OMAP4_KBD_IRQSTATUS);
+	kbd_write_irqstatus(keypad_data,
+		kbd_read_irqstatus(keypad_data, keypad_data->irqstatus));
 
 	/* enable interrupts */
-	__raw_writel(OMAP4_DEF_IRQENABLE_EVENTEN | OMAP4_DEF_IRQENABLE_LONGKEY,
-			keypad_data->base + OMAP4_KBD_IRQENABLE);
+	kbd_write_irqenable(keypad_data, OMAP4_DEF_IRQENABLE_EVENTEN |
+			OMAP4_DEF_IRQENABLE_LONGKEY);
 
 	return IRQ_HANDLED;
 }
@@ -139,16 +192,33 @@ static int omap4_keypad_open(struct input_dev *input)
 
 	disable_irq(keypad_data->irq);
 
-	__raw_writel(OMAP4_VAL_FUNCTIONALCFG,
-			keypad_data->base + OMAP4_KBD_CTRL);
-	__raw_writel(OMAP4_VAL_DEBOUNCINGTIME,
-			keypad_data->base + OMAP4_KBD_DEBOUNCINGTIME);
-	__raw_writel(OMAP4_VAL_IRQDISABLE,
-			keypad_data->base + OMAP4_KBD_IRQSTATUS);
-	__raw_writel(OMAP4_DEF_IRQENABLE_EVENTEN | OMAP4_DEF_IRQENABLE_LONGKEY,
-			keypad_data->base + OMAP4_KBD_IRQENABLE);
-	__raw_writel(OMAP4_DEF_WUP_EVENT_ENA | OMAP4_DEF_WUP_LONG_KEY_ENA,
-			keypad_data->base + OMAP4_KBD_WAKEUPENABLE);
+	keypad_data->revision = kbd_read_revision(keypad_data,
+			OMAP4_KBD_REVISION);
+	switch (keypad_data->revision) {
+	case 1:
+		keypad_data->irqstatus = OMAP4_KBD_IRQSTATUS + 0x0c;
+		keypad_data->irqenable = OMAP4_KBD_IRQENABLE + 0x0c;
+		keypad_data->reg_offset = 0x10;
+		break;
+	case 0:
+		keypad_data->irqstatus = OMAP4_KBD_IRQSTATUS;
+		keypad_data->irqenable = OMAP4_KBD_IRQENABLE;
+		keypad_data->reg_offset = 0x00;
+		break;
+	default:
+		pr_err("Omap keypad not found\n");
+		return -ENODEV;
+	}
+
+	kbd_writel(keypad_data, OMAP4_KBD_CTRL,
+			OMAP4_VAL_FUNCTIONALCFG);
+	kbd_writel(keypad_data, OMAP4_KBD_DEBOUNCINGTIME,
+			OMAP4_VAL_DEBOUNCINGTIME);
+	kbd_write_irqstatus(keypad_data, OMAP4_VAL_IRQDISABLE);
+	kbd_write_irqenable(keypad_data, OMAP4_DEF_IRQENABLE_EVENTEN |
+				OMAP4_DEF_IRQENABLE_LONGKEY);
+	kbd_writel(keypad_data, OMAP4_KBD_WAKEUPENABLE,
+			OMAP4_DEF_WUP_EVENT_ENA | OMAP4_DEF_WUP_LONG_KEY_ENA);
 
 	enable_irq(keypad_data->irq);
 
@@ -162,12 +232,11 @@ static void omap4_keypad_close(struct input_dev *input)
 	disable_irq(keypad_data->irq);
 
 	/* Disable interrupts */
-	__raw_writel(OMAP4_VAL_IRQDISABLE,
-		     keypad_data->base + OMAP4_KBD_IRQENABLE);
+	kbd_write_irqenable(keypad_data, OMAP4_VAL_IRQDISABLE);
 
 	/* clear pending interrupts */
-	__raw_writel(__raw_readl(keypad_data->base + OMAP4_KBD_IRQSTATUS),
-			keypad_data->base + OMAP4_KBD_IRQSTATUS);
+	kbd_write_irqstatus(keypad_data,
+		kbd_read_irqstatus(keypad_data, keypad_data->irqstatus));
 
 	enable_irq(keypad_data->irq);
 
-- 
1.7.1