Current driver supports only Function Index 1 & 2 as mentioned in the
ACPI ADXL DSM Interface. Added a function for ACPI Function Index 3.
Signed-off-by: Rithvik Rama <rithvik.rama@xxxxxxxxx>
---
drivers/acpi/acpi_adxl.c | 54 +++++++++++++++++++++++++++++++++++++++-
include/linux/adxl.h | 1 +
2 files changed, 54 insertions(+), 1 deletion(-)
diff --git a/drivers/acpi/acpi_adxl.c b/drivers/acpi/acpi_adxl.c
index 13c8f7b50c46..5bf53662b737 100644
--- a/drivers/acpi/acpi_adxl.c
+++ b/drivers/acpi/acpi_adxl.c
@@ -14,6 +14,7 @@
#define ADXL_REVISION 0x1
#define ADXL_IDX_GET_ADDR_PARAMS 0x1
#define ADXL_IDX_FORWARD_TRANSLATE 0x2
+#define ADXL_IDX_REVERSE_TRANSLATE 0X3
#define ACPI_ADXL_PATH "\\_SB.ADXL"
/*
@@ -135,6 +136,56 @@ int adxl_decode(u64 addr, u64 component_values[])
}
EXPORT_SYMBOL_GPL(adxl_decode);
+/**
+ * adxl_reverse_decode - Ask BIOS to decode a memory address to system address
+ * @component_values: pointer to array of values for each component
+ * Returns 0 on success, negative error code otherwise
+ *
+ */
+
+int adxl_reverse_decode(u64 component_values[])
+{
+ union acpi_object *argv4, *results, *r;
+ int i, cnt;
+
+ argv4 = kzalloc((adxl_count+1)*sizeof(*argv4), GFP_KERNEL);
+ if (!argv4)
+ return -ENOMEM;
+
+ if (!adxl_component_names)
+ return -EOPNOTSUPP;
+
+ argv4[0].type = ACPI_TYPE_PACKAGE;
+ argv4[0].package.count = adxl_count;
+ argv4[0].package.elements = &argv4[1];
+
+ /*
+ * Loop through supported memory component values
+ */
+ for (i = 1; i <= adxl_count; i++) {
+ argv4[i].integer.type = ACPI_TYPE_INTEGER;
+ argv4[i].integer.value = component_values[i-1];
+ }
+
+ results = adxl_dsm(ADXL_IDX_REVERSE_TRANSLATE, argv4);
+ if (!results)
+ return -EINVAL;
+
+ r = results->package.elements + 1;
+ cnt = r->package.count;
+ if (cnt != adxl_count) {
+ ACPI_FREE(results);
+ return -EINVAL;
+ }
+ r = r->package.elements;
+ for (i = 0; i < cnt; i++)
+ component_values[i] = r[i].integer.value;
+
+ ACPI_FREE(results);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(adxl_reverse_decode);
+
static int __init adxl_init(void)
{
char *path = ACPI_ADXL_PATH;
@@ -155,7 +206,8 @@ static int __init adxl_init(void)
if (!acpi_check_dsm(handle, &adxl_guid, ADXL_REVISION,
ADXL_IDX_GET_ADDR_PARAMS |
- ADXL_IDX_FORWARD_TRANSLATE)) {
+ ADXL_IDX_FORWARD_TRANSLATE |
+ ADXL_IDX_REVERSE_TRANSLATE)) {
pr_info("DSM method does not support forward translate\n");
return -ENODEV;
}
diff --git a/include/linux/adxl.h b/include/linux/adxl.h
index 2a629acb4c3f..f3fea64a270c 100644
--- a/include/linux/adxl.h
+++ b/include/linux/adxl.h
@@ -9,5 +9,6 @@
const char * const *adxl_get_component_names(void);
int adxl_decode(u64 addr, u64 component_values[]);
+int adxl_reverse_decode(u64 component_values[]);
#endif /* _LINUX_ADXL_H */
--
2.34.1
