[PATCH 4/5] Input: Enable STMPE keypad driver for Device Tree

[Lee Jones]

This patch allows the STMPE driver to be successfully probed and
initialised when Device Tree support is enabled. Besides the usual
platform data changes, we also separate the process of filling in
the 'in use' pin bitmap, as we have to extract the information from
Device Tree in the DT boot case.

Cc: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Cc: linux-input@xxxxxxxxxxxxxxx
Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
Acked-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx>
---
 drivers/input/keyboard/stmpe-keypad.c |   67 ++++++++++++++++++++++++++++-----
 drivers/mfd/stmpe.c                   |    1 +
 2 files changed, 59 insertions(+), 9 deletions(-)

diff --git a/drivers/input/keyboard/stmpe-keypad.c b/drivers/input/keyboard/stmpe-keypad.c
index 470a877..4ae01d5 100644
--- a/drivers/input/keyboard/stmpe-keypad.c
+++ b/drivers/input/keyboard/stmpe-keypad.c
@@ -257,19 +257,73 @@ static int __devinit stmpe_keypad_chip_init(struct stmpe_keypad *keypad)
 			      (plat->debounce_ms << 1));
 }
 
+static int stmpe_keypad_fill_used_pins(struct platform_device *pdev,
+				struct stmpe_keypad *keypad,
+				struct stmpe_keypad_platform_data *plat)
+{
+	struct device_node *np = pdev->dev.of_node;
+	unsigned int proplen;
+	const __be32 *prop;
+	int i;
+
+	if (np) {
+		prop = of_get_property(np, "linux,keymap", &proplen);
+		if (!prop) {
+			dev_err(&pdev->dev,
+				"linux,keymap property not defined\n");
+			return -EINVAL;
+		}
+
+		for (i = 0; i < proplen / sizeof(u32); i++) {
+			unsigned int key = be32_to_cpup(prop + i);
+
+			keypad->cols |= 1 << KEY_COL(key);
+			keypad->rows |= 1 << KEY_ROW(key);
+		}
+	} else {
+		for (i = 0; i < plat->keymap_data->keymap_size; i++) {
+			unsigned int key = plat->keymap_data->keymap[i];
+
+			keypad->cols |= 1 << KEY_COL(key);
+			keypad->rows |= 1 << KEY_ROW(key);
+		}
+	}
+
+	return 0;
+}
+
+static void __devinit stmpe_keypad_of_probe(struct device_node *np,
+				struct stmpe_keypad_platform_data *plat)
+{
+	of_property_read_u32(np, "debounce-interval", &plat->debounce_ms);
+	of_property_read_u32(np, "st,scan-count", &plat->scan_count);
+
+	if (of_get_property(np, "st,no-autorepeat", NULL))
+		plat->no_autorepeat = true;
+}
+
 static int __devinit stmpe_keypad_probe(struct platform_device *pdev)
 {
 	struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
 	struct stmpe_keypad_platform_data *plat;
+	struct device_node *np = pdev->dev.of_node;
 	struct stmpe_keypad *keypad;
 	struct input_dev *input;
 	int ret;
 	int irq;
-	int i;
 
 	plat = stmpe->pdata->keypad;
-	if (!plat)
-		return -ENODEV;
+	if (!plat) {
+		if (np) {
+			plat = devm_kzalloc(&pdev->dev,
+					sizeof(*plat), GFP_KERNEL);
+			if (!plat)
+				return -ENOMEM;
+
+			stmpe_keypad_of_probe(np, plat);
+		} else
+			return -ENODEV;
+	}
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
@@ -300,12 +354,7 @@ static int __devinit stmpe_keypad_probe(struct platform_device *pdev)
 	if (!plat->no_autorepeat)
 		__set_bit(EV_REP, input->evbit);
 
-	for (i = 0; i < plat->keymap_data->keymap_size; i++) {
-		unsigned int key = plat->keymap_data->keymap[i];
-
-		keypad->cols |= 1 << KEY_COL(key);
-		keypad->rows |= 1 << KEY_ROW(key);
-	}
+	stmpe_keypad_fill_used_pins(pdev, keypad, plat);
 
 	keypad->stmpe = stmpe;
 	keypad->plat = plat;
diff --git a/drivers/mfd/stmpe.c b/drivers/mfd/stmpe.c
index ba157d4..b03cc64 100644
--- a/drivers/mfd/stmpe.c
+++ b/drivers/mfd/stmpe.c
@@ -321,6 +321,7 @@ static struct resource stmpe_keypad_resources[] = {
 
 static struct mfd_cell stmpe_keypad_cell = {
 	.name		= "stmpe-keypad",
+	.of_compatible  = "st,stmpe-keypad",
 	.resources	= stmpe_keypad_resources,
 	.num_resources	= ARRAY_SIZE(stmpe_keypad_resources),
 };
-- 
1.7.9.5

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