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bbswitch: fix more return values and document acpi_call_dsm

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This commit is contained in:
Lekensteyn 2011-12-14 19:20:58 +01:00
parent d0c1e29818
commit cce4ffd2f7
1 changed files with 6 additions and 3 deletions
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9
bbswitch.c
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@ -64,6 +64,9 @@ static char *buffer_to_string(const char buffer[], char *target) {
return target; return target;
} }
// Returns 0 if the call succeeded and non-zero otherwise. If the call
// succeeded, the result is stored in "result" providing that the result is an
// integer or a buffer containing 4 values
static int acpi_call_dsm(acpi_handle handle, const char muid[16], int revid, static int acpi_call_dsm(acpi_handle handle, const char muid[16], int revid,
int func, char *args, uint32_t *result) { int func, char *args, uint32_t *result) {
struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
@ -128,7 +131,7 @@ static int has_dsm_func(const char muid[16], int revid, int sfnc) {
u32 result = 0; u32 result = 0;
// fail if the _DSM call failed // fail if the _DSM call failed
if (!acpi_call_dsm(dis_handle, muid, revid, 0, 0, &result)) if (acpi_call_dsm(dis_handle, muid, revid, 0, 0, &result))
return 0; return 0;
// ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. If // ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. If
@ -155,7 +158,7 @@ static int bbswitch_acpi_off(void) {
char args[] = {2, 0, 0, 0}; char args[] = {2, 0, 0, 0};
u32 result = 0; u32 result = 0;
if (acpi_call_dsm(dis_handle, acpi_nvidia_dsm_muid, 0x102, 0x3, args, if (!acpi_call_dsm(dis_handle, acpi_nvidia_dsm_muid, 0x102, 0x3, args,
&result)) { &result)) {
// failure // failure
return 1; return 1;
@ -171,7 +174,7 @@ static int bbswitch_acpi_on(void) {
char args[] = {1, 0, 0, 0}; char args[] = {1, 0, 0, 0};
u32 result = 0; u32 result = 0;
if (acpi_call_dsm(dis_handle, acpi_nvidia_dsm_muid, 0x102, 0x3, args, if (!acpi_call_dsm(dis_handle, acpi_nvidia_dsm_muid, 0x102, 0x3, args,
&result)) { &result)) {
// failure // failure
return 1; return 1;