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path: root/drivers/acpi/acpica/exconvrt.c
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Diffstat (limited to 'drivers/acpi/acpica/exconvrt.c')
-rw-r--r--drivers/acpi/acpica/exconvrt.c49
1 files changed, 37 insertions, 12 deletions
diff --git a/drivers/acpi/acpica/exconvrt.c b/drivers/acpi/acpica/exconvrt.c
index 98de48481776..1a70b80cc406 100644
--- a/drivers/acpi/acpica/exconvrt.c
+++ b/drivers/acpi/acpica/exconvrt.c
@@ -323,7 +323,7 @@ acpi_ex_convert_to_ascii(u64 integer, u16 base, u8 *string, u8 data_width)
/* hex_length: 2 ascii hex chars per data byte */
- hex_length = ACPI_MUL_2(data_width);
+ hex_length = (data_width * 2);
for (i = 0, j = (hex_length - 1); i < hex_length; i++, j--) {
/* Get one hex digit, most significant digits first */
@@ -364,7 +364,8 @@ acpi_ex_convert_to_ascii(u64 integer, u16 base, u8 *string, u8 data_width)
*
* RETURN: Status
*
- * DESCRIPTION: Convert an ACPI Object to a string
+ * DESCRIPTION: Convert an ACPI Object to a string. Supports both implicit
+ * and explicit conversions and related rules.
*
******************************************************************************/
@@ -393,9 +394,11 @@ acpi_ex_convert_to_string(union acpi_operand_object * obj_desc,
switch (type) {
case ACPI_EXPLICIT_CONVERT_DECIMAL:
-
- /* Make room for maximum decimal number */
-
+ /*
+ * From to_decimal_string, integer source.
+ *
+ * Make room for the maximum decimal number size
+ */
string_length = ACPI_MAX_DECIMAL_DIGITS;
base = 10;
break;
@@ -440,8 +443,10 @@ acpi_ex_convert_to_string(union acpi_operand_object * obj_desc,
switch (type) {
case ACPI_EXPLICIT_CONVERT_DECIMAL: /* Used by to_decimal_string */
/*
- * From ACPI: "If Data is a buffer, it is converted to a string of
- * decimal values separated by commas."
+ * Explicit conversion from the to_decimal_string ASL operator.
+ *
+ * From ACPI: "If the input is a buffer, it is converted to a
+ * a string of decimal values separated by commas."
*/
base = 10;
@@ -462,20 +467,29 @@ acpi_ex_convert_to_string(union acpi_operand_object * obj_desc,
case ACPI_IMPLICIT_CONVERT_HEX:
/*
+ * Implicit buffer-to-string conversion
+ *
* From the ACPI spec:
- *"The entire contents of the buffer are converted to a string of
+ * "The entire contents of the buffer are converted to a string of
* two-character hexadecimal numbers, each separated by a space."
+ *
+ * Each hex number is prefixed with 0x (11/2018)
*/
separator = ' ';
- string_length = (obj_desc->buffer.length * 3);
+ string_length = (obj_desc->buffer.length * 5);
break;
- case ACPI_EXPLICIT_CONVERT_HEX: /* Used by to_hex_string */
+ case ACPI_EXPLICIT_CONVERT_HEX:
/*
+ * Explicit conversion from the to_hex_string ASL operator.
+ *
* From ACPI: "If Data is a buffer, it is converted to a string of
* hexadecimal values separated by commas."
+ *
+ * Each hex number is prefixed with 0x (11/2018)
*/
- string_length = (obj_desc->buffer.length * 3);
+ separator = ',';
+ string_length = (obj_desc->buffer.length * 5);
break;
default:
@@ -504,10 +518,21 @@ acpi_ex_convert_to_string(union acpi_operand_object * obj_desc,
* (separated by commas or spaces)
*/
for (i = 0; i < obj_desc->buffer.length; i++) {
+ if (base == 16) {
+
+ /* Emit 0x prefix for explict/implicit hex conversion */
+
+ *new_buf++ = '0';
+ *new_buf++ = 'x';
+ }
+
new_buf += acpi_ex_convert_to_ascii((u64) obj_desc->
buffer.pointer[i],
base, new_buf, 1);
- *new_buf++ = separator; /* each separated by a comma or space */
+
+ /* Each digit is separated by either a comma or space */
+
+ *new_buf++ = separator;
}
/*