diff options
| author | Tzung-Bi Shih <tzungbi@kernel.org> | 2023-08-03 09:12:45 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-09-13 09:48:42 +0200 |
| commit | 39c23c94115352613281299b046c8e8b4a2a334d (patch) | |
| tree | 9fcb1d692988680c2eab2d7a090509200b391e5d | |
| parent | 01474630c56668c3b1261d572b24c748a1cc17ff (diff) | |
platform/chrome: chromeos_acpi: print hex string for ACPI_TYPE_BUFFER
commit 0820debb7d489e9eb1f68b7bb69e6ae210699b3f upstream.
`element->buffer.pointer` should be binary blob. `%s` doesn't work
perfect for them.
Print hex string for ACPI_TYPE_BUFFER. Also update the documentation
to reflect this.
Fixes: 0a4cad9c11ad ("platform/chrome: Add ChromeOS ACPI device driver")
Cc: stable@vger.kernel.org
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20230803011245.3773756-1-tzungbi@kernel.org
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | Documentation/ABI/testing/sysfs-driver-chromeos-acpi | 2 | ||||
| -rw-r--r-- | drivers/platform/chrome/chromeos_acpi.c | 31 |
2 files changed, 31 insertions, 2 deletions
diff --git a/Documentation/ABI/testing/sysfs-driver-chromeos-acpi b/Documentation/ABI/testing/sysfs-driver-chromeos-acpi index c308926e1568..7c8e129fc100 100644 --- a/Documentation/ABI/testing/sysfs-driver-chromeos-acpi +++ b/Documentation/ABI/testing/sysfs-driver-chromeos-acpi @@ -134,4 +134,4 @@ KernelVersion: 5.19 Description: Returns the verified boot data block shared between the firmware verification step and the kernel verification step - (binary). + (hex dump). diff --git a/drivers/platform/chrome/chromeos_acpi.c b/drivers/platform/chrome/chromeos_acpi.c index 50d8a4d4352d..1312aaaa8750 100644 --- a/drivers/platform/chrome/chromeos_acpi.c +++ b/drivers/platform/chrome/chromeos_acpi.c @@ -90,7 +90,36 @@ 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, r, at, room_left; + const int byte_per_line = 16; + + at = 0; + room_left = PAGE_SIZE - 1; + for (i = 0; i < element->buffer.length && room_left; i += byte_per_line) { + r = hex_dump_to_buffer(element->buffer.pointer + i, + element->buffer.length - i, + byte_per_line, 1, buf + at, room_left, + false); + if (r > room_left) + goto truncating; + at += r; + room_left -= r; + + r = sysfs_emit_at(buf, at, "\n"); + if (!r) + goto truncating; + at += r; + room_left -= r; + } + + buf[at] = 0; + return at; +truncating: + dev_info_once(dev, "truncating sysfs content for %s\n", name); + sysfs_emit_at(buf, PAGE_SIZE - 4, "..\n"); + return PAGE_SIZE - 1; + } default: dev_err(dev, "element type %d not supported\n", element->type); return -EINVAL; |