[PATCH] platform/chrome: chromeos_acpi: print hex string for ACPI_TYPE_BUFFER

[Tzung-Bi Shih <tzungbi@kernel.org>]

`element->buffer.pointer` should be binary blob.  `%s` doesn't work perfect
for them.

Print hex string for ACPI_TYPE_BUFFER.

Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
---
 drivers/platform/chrome/chromeos_acpi.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/chrome/chromeos_acpi.c b/drivers/platform/chrome/chromeos_acpi.c
index 50d8a4d4352d..a60d344c54e4 100644
--- a/drivers/platform/chrome/chromeos_acpi.c
+++ b/drivers/platform/chrome/chromeos_acpi.c
@@ -90,7 +90,25 @@ static int chromeos_acpi_handle_package(struct device *dev, union acpi_object *o
 	case ACPI_TYPE_STRING:
 		return sysfs_emit(buf, "%s\n", element->string.pointer);
 	case ACPI_TYPE_BUFFER:
-		return sysfs_emit(buf, "%s\n", element->buffer.pointer);
+		{
+			int i, n;
+			const int char_per_line = 16;
+
+			for (i = 0, n = 0; i < element->buffer.length; ++i) {
+				n += sysfs_emit_at(buf, n, " %2.2x", element->buffer.pointer[i]);
+
+				if (((i + 1) % char_per_line) == 0)
+					n += sysfs_emit_at(buf, n, "\n");
+			}
+			n += sysfs_emit_at(buf, n, "\n");
+
+			if (n == PAGE_SIZE - 1) {
+				dev_info(dev, "truncating sysfs content for %s\n", name);
+				sysfs_emit_at(buf, n - 3, "..\n");
+			}
+
+			return n;
+		}
 	default:
 		dev_err(dev, "element type %d not supported\n", element->type);
 		return -EINVAL;
-- 
2.41.0.487.g6d72f3e995-goog