Input: pxa27x-keypad - add device tree support

Signed-off-by: Chao Xie <chao.xie@marvell.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 242 insertions, 4 deletions

diff --git a/drivers/input/keyboard/pxa27x_keypad.c b/drivers/input/keyboard/pxa27x_keypad.c
index 5b2d8764dd37..533fd6c7c3c8 100644
--- a/drivers/input/keyboard/pxa27x_keypad.c
+++ b/drivers/input/keyboard/pxa27x_keypad.c
@@ -118,6 +118,229 @@ struct pxa27x_keypad {
 	unsigned int direct_key_mask;
 };
 
+#ifdef CONFIG_OF
+static int pxa27x_keypad_matrix_key_parse_dt(struct pxa27x_keypad *keypad)
+{
+	struct input_dev *input_dev = keypad->input_dev;
+	struct device *dev = input_dev->dev.parent;
+	struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
+	u32 rows, cols;
+	int error;
+
+	error = matrix_keypad_parse_of_params(dev, &rows, &cols);
+	if (error)
+		return error;
+
+	if (rows > MAX_MATRIX_KEY_ROWS || cols > MAX_MATRIX_KEY_COLS) {
+		dev_err(dev, "rows or cols exceeds maximum value\n");
+		return -EINVAL;
+	}
+
+	pdata->matrix_key_rows = rows;
+	pdata->matrix_key_cols = cols;
+
+	error = matrix_keypad_build_keymap(NULL, NULL,
+					   pdata->matrix_key_rows,
+					   pdata->matrix_key_cols,
+					   keypad->keycodes, input_dev);
+	if (error)
+		return error;
+
+	return 0;
+}
+
+static int pxa27x_keypad_direct_key_parse_dt(struct pxa27x_keypad *keypad)
+{
+	struct input_dev *input_dev = keypad->input_dev;
+	struct device *dev = input_dev->dev.parent;
+	struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
+	struct device_node *np = dev->of_node;
+	const __be16 *prop;
+	unsigned short code;
+	unsigned int proplen, size;
+	int i;
+	int error;
+
+	error = of_property_read_u32(np, "marvell,direct-key-count",
+				     &pdata->direct_key_num);
+	if (error) {
+		/*
+		 * If do not have marvel,direct-key-count defined,
+		 * it means direct key is not supported.
+		 */
+		return error == -EINVAL ? 0 : error;
+	}
+
+	error = of_property_read_u32(np, "marvell,direct-key-mask",
+				     &pdata->direct_key_mask);
+	if (error) {
+		if (error != -EINVAL)
+			return error;
+
+		/*
+		 * If marvell,direct-key-mask is not defined, driver will use
+		 * default value. Default value is set when configure the keypad.
+		 */
+		pdata->direct_key_mask = 0;
+	}
+
+	pdata->direct_key_low_active = of_property_read_bool(np,
+					"marvell,direct-key-low-active");
+
+	prop = of_get_property(np, "marvell,direct-key-map", &proplen);
+	if (!prop)
+		return -EINVAL;
+
+	if (proplen % sizeof(u16))
+		return -EINVAL;
+
+	size = proplen / sizeof(u16);
+
+	/* Only MAX_DIRECT_KEY_NUM is accepted.*/
+	if (size > MAX_DIRECT_KEY_NUM)
+		return -EINVAL;
+
+	for (i = 0; i < size; i++) {
+		code = be16_to_cpup(prop + i);
+		keypad->keycodes[MAX_MATRIX_KEY_NUM + i] = code;
+		__set_bit(code, input_dev->keybit);
+	}
+
+	return 0;
+}
+
+static int pxa27x_keypad_rotary_parse_dt(struct pxa27x_keypad *keypad)
+{
+	const __be32 *prop;
+	int i, relkey_ret;
+	unsigned int code, proplen;
+	const char *rotaryname[2] = {
+			"marvell,rotary0", "marvell,rotary1"};
+	const char relkeyname[] = {"marvell,rotary-rel-key"};
+	struct input_dev *input_dev = keypad->input_dev;
+	struct device *dev = input_dev->dev.parent;
+	struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
+	struct device_node *np = dev->of_node;
+
+	relkey_ret = of_property_read_u32(np, relkeyname, &code);
+	/* if can read correct rotary key-code, we do not need this. */
+	if (relkey_ret == 0) {
+		unsigned short relcode;
+
+		/* rotary0 taks lower half, rotary1 taks upper half. */
+		relcode = code & 0xffff;
+		pdata->rotary0_rel_code = (code & 0xffff);
+		__set_bit(relcode, input_dev->relbit);
+
+		relcode = code >> 16;
+		pdata->rotary1_rel_code = relcode;
+		__set_bit(relcode, input_dev->relbit);
+	}
+
+	for (i = 0; i < 2; i++) {
+		prop = of_get_property(np, rotaryname[i], &proplen);
+		/*
+		 * If the prop is not set, it means keypad does not need
+		 * initialize the rotaryX.
+		 */
+		if (!prop)
+			continue;
+
+		code = be32_to_cpup(prop);
+		/*
+		 * Not all up/down key code are valid.
+		 * Now we depends on direct-rel-code.
+		 */
+		if ((!(code & 0xffff) || !(code >> 16)) && relkey_ret) {
+			return relkey_ret;
+		} else {
+			unsigned int n = MAX_MATRIX_KEY_NUM + (i << 1);
+			unsigned short keycode;
+
+			keycode = code & 0xffff;
+			keypad->keycodes[n] = keycode;
+			__set_bit(keycode, input_dev->keybit);
+
+			keycode = code >> 16;
+			keypad->keycodes[n + 1] = keycode;
+			__set_bit(keycode, input_dev->keybit);
+
+			if (i == 0)
+				pdata->rotary0_rel_code = -1;
+			else
+				pdata->rotary1_rel_code = -1;
+		}
+		if (i == 0)
+			pdata->enable_rotary0 = 1;
+		else
+			pdata->enable_rotary1 = 1;
+	}
+
+	keypad->rotary_rel_code[0] = pdata->rotary0_rel_code;
+	keypad->rotary_rel_code[1] = pdata->rotary1_rel_code;
+
+	return 0;
+}
+
+static int pxa27x_keypad_build_keycode_from_dt(struct pxa27x_keypad *keypad)
+{
+	struct input_dev *input_dev = keypad->input_dev;
+	struct device *dev = input_dev->dev.parent;
+	struct device_node *np = dev->of_node;
+	int error;
+
+	keypad->pdata = devm_kzalloc(dev, sizeof(*keypad->pdata),
+				     GFP_KERNEL);
+	if (!keypad->pdata) {
+		dev_err(dev, "failed to allocate memory for pdata\n");
+		return -ENOMEM;
+	}
+
+	error = pxa27x_keypad_matrix_key_parse_dt(keypad);
+	if (error) {
+		dev_err(dev, "failed to parse matrix key\n");
+		return error;
+	}
+
+	error = pxa27x_keypad_direct_key_parse_dt(keypad);
+	if (error) {
+		dev_err(dev, "failed to parse direct key\n");
+		return error;
+	}
+
+	error = pxa27x_keypad_rotary_parse_dt(keypad);
+	if (error) {
+		dev_err(dev, "failed to parse rotary key\n");
+		return error;
+	}
+
+	error = of_property_read_u32(np, "marvell,debounce-interval",
+				    &keypad->pdata->debounce_interval);
+	if (error) {
+		dev_err(dev, "failed to parse debpunce-interval\n");
+		return error;
+	}
+
+	/*
+	 * The keycodes may not only includes matrix key but also the direct
+	 * key or rotary key.
+	 */
+	input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
+
+	return 0;
+}
+
+#else
+
+static int pxa27x_keypad_build_keycode_from_dt(struct pxa27x_keypad *keypad)
+{
+	dev_info(keypad->input_dev->dev.parent, "missing platform data\n");
+
+	return -EINVAL;
+}
+
+#endif
+
 static int pxa27x_keypad_build_keycode(struct pxa27x_keypad *keypad)
 {
 	struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
@@ -492,15 +715,15 @@ static const struct dev_pm_ops pxa27x_keypad_pm_ops = {
 static int pxa27x_keypad_probe(struct platform_device *pdev)
 {
 	struct pxa27x_keypad_platform_data *pdata = pdev->dev.platform_data;
+	struct device_node *np = pdev->dev.of_node;
 	struct pxa27x_keypad *keypad;
 	struct input_dev *input_dev;
 	struct resource *res;
 	int irq, error;
 
-	if (pdata == NULL) {
-		dev_err(&pdev->dev, "no platform data defined\n");
+	/* Driver need build keycode from device tree or pdata */
+	if (!np && !pdata)
 		return -EINVAL;
-	}
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
@@ -562,12 +785,18 @@ static int pxa27x_keypad_probe(struct platform_device *pdev)
 	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
 	input_set_capability(input_dev, EV_MSC, MSC_SCAN);
 
-	error = pxa27x_keypad_build_keycode(keypad);
+	if (pdata)
+		error = pxa27x_keypad_build_keycode(keypad);
+	else
+		error = pxa27x_keypad_build_keycode_from_dt(keypad);
 	if (error) {
 		dev_err(&pdev->dev, "failed to build keycode\n");
 		goto failed_put_clk;
 	}
 
+	/* If device tree is supported, pdata will be allocated. */
+	pdata = keypad->pdata;
+
 	if ((pdata->enable_rotary0 && keypad->rotary_rel_code[0] != -1) ||
 	    (pdata->enable_rotary1 && keypad->rotary_rel_code[1] != -1)) {
 		input_dev->evbit[0] |= BIT_MASK(EV_REL);
@@ -628,11 +857,20 @@ static int pxa27x_keypad_remove(struct platform_device *pdev)
 /* work with hotplug and coldplug */
 MODULE_ALIAS("platform:pxa27x-keypad");
 
+#ifdef CONFIG_OF
+static const struct of_device_id pxa27x_keypad_dt_match[] = {
+	{ .compatible = "marvell,pxa27x-keypad" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, pxa27x_keypad_dt_match);
+#endif
+
 static struct platform_driver pxa27x_keypad_driver = {
 	.probe		= pxa27x_keypad_probe,
 	.remove		= pxa27x_keypad_remove,
 	.driver		= {
 		.name	= "pxa27x-keypad",
+		.of_match_table = of_match_ptr(pxa27x_keypad_dt_match),
 		.owner	= THIS_MODULE,
 #ifdef CONFIG_PM
 		.pm	= &pxa27x_keypad_pm_ops,