[PATCH v2 1/2] dt-bindings: input: cros-ec-keyb: Add a new property

@@ -31,6 +31,16 @@ properties:
       if the EC does not have its own logic or hardware for this.
     type: boolean
 
+  function-row-physmap:
+    $ref: '/schemas/types.yaml#/definitions/uint32-array'
+    description: |
+      An ordered u32 array describing the rows/columns (in the scan matrix)
+      of top row keys from physical left (KEY_F1) to right. Each entry
+      encodes the row/column as:
+      (((row) & 0xFF) << 24) | (((column) & 0xFF) << 16)
+      where the lower 16 bits are reserved. This property is specified only
+      when the keyboard has a custom design for the top row keys.
+
 required:
   - compatible
 

@@ -27,6 +27,8 @@
 
 #include <asm/unaligned.h>
 
+#define MAX_NUM_TOP_ROW_KEYS   15
+
 /**
  * struct cros_ec_keyb - Structure representing EC keyboard device
  *

@@ -35,6 +37,7 @@
  * @row_shift: log2 or number of rows, rounded up
  * @keymap_data: Matrix keymap data used to convert to keyscan values
  * @ghost_filter: true to enable the matrix key-ghosting filter
+ * @has_custom_top_row_keys: true if the keyboard has custom top row keys
  * @valid_keys: bitmap of existing keys for each matrix column
  * @old_kb_state: bitmap of keys pressed last scan
  * @dev: Device pointer

@@ -49,6 +52,7 @@ struct cros_ec_keyb {
 	int row_shift;
 	const struct matrix_keymap_data *keymap_data;
 	bool ghost_filter;
+	bool has_custom_top_row_keys;
 	uint8_t *valid_keys;
 	uint8_t *old_kb_state;
 

@@ -587,6 +591,65 @@ static int cros_ec_keyb_register_matrix(struct cros_ec_keyb *ckdev)
 	return 0;
 }
 
+static ssize_t function_row_physmap_show(struct device *dev,
+					 struct device_attribute *attr,
+					 char *buf)
+{
+	ssize_t size = 0;
+	u8 i;
+	u16 code;
+	u32 top_row_key_code[MAX_NUM_TOP_ROW_KEYS] = {0};
+	struct cros_ec_keyb *ckdev = dev_get_drvdata(dev);
+
+	if (of_property_read_variable_u32_array(dev->of_node,
+						"function-row-physmap",
+						top_row_key_code,
+						0,
+						MAX_NUM_TOP_ROW_KEYS) > 0)
+		return 0;
+
+	ckdev->has_custom_top_row_keys = true;
+
+	for (i = 0; i < MAX_NUM_TOP_ROW_KEYS; i++) {
+		if (!top_row_key_code[i])
+			break;
+		code = MATRIX_SCAN_CODE(KEY_ROW(top_row_key_code[i]),
+					KEY_COL(top_row_key_code[i]),
+					ckdev->row_shift);
+		size += scnprintf(buf + size, PAGE_SIZE - size, "%02X ", code);
+	}
+	size += scnprintf(buf + size, PAGE_SIZE - size, "\n");
+
+	return size;
+}
+
+static DEVICE_ATTR_RO(function_row_physmap);
+
+static struct attribute *cros_ec_keyb_attrs[] = {
+	&dev_attr_function_row_physmap.attr,
+	NULL,
+};
+
+static umode_t cros_ec_keyb_attr_is_visible(struct kobject *kobj,
+					    struct attribute *attr,
+					    int n)
+{
+	struct device *dev = container_of(kobj, struct device, kobj);
+	struct cros_ec_keyb *ckdev = dev_get_drvdata(dev);
+
+	if (attr == &dev_attr_function_row_physmap.attr &&
+	    !ckdev->has_custom_top_row_keys)
+		return 0;
+
+	return attr->mode;
+}
+
+static const struct attribute_group cros_ec_keyb_attr_group = {
+	.is_visible = cros_ec_keyb_attr_is_visible,
+	.attrs = cros_ec_keyb_attrs,
+};
+
+
 static int cros_ec_keyb_probe(struct platform_device *pdev)
 {
 	struct cros_ec_device *ec = dev_get_drvdata(pdev->dev.parent);

@@ -617,6 +680,12 @@ static int cros_ec_keyb_probe(struct platform_device *pdev)
 		return err;
 	}
 
+	err = sysfs_create_group(&dev->kobj, &cros_ec_keyb_attr_group);
+	if (err) {
+		dev_err(dev, "failed to create attributes. err=%d\n", err);
+		return err;
+	}
+
 	ckdev->notifier.notifier_call = cros_ec_keyb_work;
 	err = blocking_notifier_chain_register(&ckdev->ec->event_notifier,
 					       &ckdev->notifier);

@@ -632,6 +701,9 @@ static int cros_ec_keyb_probe(struct platform_device *pdev)
 static int cros_ec_keyb_remove(struct platform_device *pdev)
 {
 	struct cros_ec_keyb *ckdev = dev_get_drvdata(&pdev->dev);
+	struct device *dev = &pdev->dev;
+
+	sysfs_remove_group(&dev->kobj, &cros_ec_keyb_attr_group);
 
 	blocking_notifier_chain_unregister(&ckdev->ec->event_notifier,
 					   &ckdev->notifier);