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Add support for WMMX method

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This should support at least the Lenovo Ideapad Y470 and Y570. It probes the
WMMX method before calling the _DSM method directly since that method should
work for all machines that support the NVIDIA DSM.
common-wmi
Lekensteyn 13 years ago
parent 4f73396ba7
commit 11ddd3469f
1 changed files with 92 additions and 13 deletions
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105
bbswitch.c
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@ -41,6 +41,8 @@ static const char acpi_optimus_dsm_muid[16] = {
0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
};
#define MXM_WMMX_GUID "F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0"
#define MXM_WMMX_FUNC_DSM 0x4D53445F /* NVIDIA DSM */
static const char acpi_nvidia_dsm_muid[16] = {
0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4
@ -56,10 +58,22 @@ It looks like something for Intel GPU:
http://lxr.linux.no/#linux+v3.1.5/drivers/gpu/drm/i915/intel_acpi.c
*/
#define DSM_TYPE_UNSUPPORTED 0
#define DSM_TYPE_OPTIMUS 1
#define DSM_TYPE_NVIDIA 2
static int dsm_type = DSM_TYPE_UNSUPPORTED;
struct mxdsm_args {
u32 func;
char muid[16];
u32 revid;
u32 sfnc;
char args[4];
};
enum dsm_type {
DSM_TYPE_UNSUPPORTED,
DSM_TYPE_OPTIMUS,
DSM_TYPE_NVIDIA,
/* _DSM call through a WMI MX method */
DSM_TYPE_NVIDIA_WMI,
};
static enum dsm_type dsm_type = DSM_TYPE_UNSUPPORTED;
static struct pci_dev *dis_dev;
static acpi_handle dis_handle;
@ -78,6 +92,8 @@ static char *buffer_to_string(const char buffer[], char *target) {
return target;
}
static int parse_dsm_result(struct acpi_buffer *output, uint32_t *result);
// 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
@ -86,7 +102,6 @@ static int acpi_call_dsm(acpi_handle handle, const char muid[16], int revid,
struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
struct acpi_object_list input;
union acpi_object params[4];
union acpi_object *obj;
int err;
input.count = 4;
@ -118,8 +133,12 @@ static int acpi_call_dsm(acpi_handle handle, const char muid[16], int revid,
buffer_to_string(args, tmp), acpi_format_exception(err));
return err;
}
return parse_dsm_result(&output, result);
}
obj = (union acpi_object *)output.pointer;
// Processes the result of an ACPI _DSM call and deallocates the result memory
static int parse_dsm_result(struct acpi_buffer *output, uint32_t *result) {
union acpi_object *obj = output->pointer;
if (obj->type == ACPI_TYPE_INTEGER && result) {
*result = obj->integer.value;
@ -136,7 +155,7 @@ static int acpi_call_dsm(acpi_handle handle, const char muid[16], int revid,
" type: %X\n", obj->type);
}
kfree(output.pointer);
kfree(output->pointer);
return 0;
}
@ -153,6 +172,51 @@ static int has_dsm_func(const char muid[16], int revid, int sfnc) {
return result & 1 && result & (1 << sfnc);
}
// 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 wmmx_call(const char muid[16], int revid, int func, char args[4],
uint32_t *result) {
struct mxdsm_args mx_args = {
.func = MXM_WMMX_FUNC_DSM,
.revid = revid,
.sfnc = func,
};
struct acpi_buffer input = { (acpi_size)sizeof(mx_args), &mx_args };
struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
acpi_status status;
memcpy(mx_args.muid, muid, sizeof(mx_args.muid));
if (args) {
memcpy(mx_args.args, args, sizeof(mx_args.args));
} else {
// some implementations do not like empty values
memset(mx_args.args, 0, sizeof(mx_args.args));
}
// 1, > 1 <-- required by at least Acer Travelmate 8472TG, seen on others
status = wmi_evaluate_method(MXM_WMMX_GUID, 1, 1, &input, &output);
if (ACPI_FAILURE(status)) {
printk(KERN_WARNING "bbswitch: failed to evaluate WMMX: %s\n",
acpi_format_exception(status));
return status;
}
return parse_dsm_result(&output, result);
}
// Returns 1 if a _DSM function and its function index exists and 0 otherwise
static int has_wmi_func(const char muid[16], int revid, int sfnc) {
u32 result = 0;
// fail if the _DSM call failed
if (wmmx_call(muid, revid, 0, 0, &result))
return 0;
// ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. If
// the n-th bit is enabled, function n is supported
return result & 1 && result & (1 << sfnc);
}
static int bbswitch_optimus_dsm(void) {
if (dsm_type == DSM_TYPE_OPTIMUS) {
char args[] = {1, 0, 0, 3};
@ -170,10 +234,9 @@ static int bbswitch_optimus_dsm(void) {
}
static int bbswitch_acpi_off(void) {
char args[] = {2, 0, 0, 0};
u32 result = 0;
if (dsm_type == DSM_TYPE_NVIDIA) {
char args[] = {2, 0, 0, 0};
u32 result = 0;
if (acpi_call_dsm(dis_handle, acpi_nvidia_dsm_muid, 0x102, 0x3, args,
&result)) {
// failure
@ -181,15 +244,21 @@ static int bbswitch_acpi_off(void) {
}
printk(KERN_DEBUG "bbswitch: Result of _DSM call for OFF: %08X\n",
result);
} else if (dsm_type == DSM_TYPE_NVIDIA_WMI) {
if (wmmx_call(acpi_nvidia_dsm_muid, 0x102, 0x3, args, &result)) {
// failure
return 1;
}
printk(KERN_DEBUG "bbswitch: Result of WMMX call for OFF: %08X\n",
result);
}
return 0;
}
static int bbswitch_acpi_on(void) {
char args[] = {1, 0, 0, 0};
u32 result = 0;
if (dsm_type == DSM_TYPE_NVIDIA) {
char args[] = {1, 0, 0, 0};
u32 result = 0;
if (acpi_call_dsm(dis_handle, acpi_nvidia_dsm_muid, 0x102, 0x3, args,
&result)) {
// failure
@ -197,6 +266,13 @@ static int bbswitch_acpi_on(void) {
}
printk(KERN_DEBUG "bbswitch: Result of _DSM call for ON: %08X\n",
result);
} else if (dsm_type == DSM_TYPE_NVIDIA_WMI) {
if (wmmx_call(acpi_nvidia_dsm_muid, 0x102, 0x3, args, &result)) {
// failure
return 1;
}
printk(KERN_DEBUG "bbswitch: Result of WMMX call for ON: %08X\n",
result);
}
return 0;
}
@ -369,6 +445,9 @@ static int __init bbswitch_init(void) {
if (has_dsm_func(acpi_optimus_dsm_muid, 0x100, 0x1A)) {
dsm_type = DSM_TYPE_OPTIMUS;
printk(KERN_INFO "bbswitch: detected an Optimus _DSM function\n");
} else if (has_wmi_func(acpi_nvidia_dsm_muid, 0x102, 0x3)) {
dsm_type = DSM_TYPE_NVIDIA_WMI;
printk(KERN_INFO "bbswitch: detected a nVidia WMMX function\n");
} else if (has_dsm_func(acpi_nvidia_dsm_muid, 0x102, 0x3)) {
dsm_type = DSM_TYPE_NVIDIA;
printk(KERN_INFO "bbswitch: detected a nVidia _DSM function\n");

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