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#include <linux/pci.h>
#include <linux/acpi.h>
#include <linux/slab.h>
#include <acpi/acpi_drivers.h>
#include <acpi/acpi_bus.h>
#include "drmP.h"
#include "drm.h"
#include "drm_sarea.h"
#include "drm_crtc_helper.h"
#include "nouveau_drv.h"
#include "nouveau_drm.h"
#include "nv50_display.h"
#include <linux/vga_switcheroo.h>
#define NOUVEAU_DSM_SUPPORTED 0x00
#define NOUVEAU_DSM_SUPPORTED_FUNCTIONS 0x00
#define NOUVEAU_DSM_ACTIVE 0x01
#define NOUVEAU_DSM_ACTIVE_QUERY 0x00
#define NOUVEAU_DSM_LED 0x02
#define NOUVEAU_DSM_LED_STATE 0x00
#define NOUVEAU_DSM_LED_OFF 0x10
#define NOUVEAU_DSM_LED_STAMINA 0x11
#define NOUVEAU_DSM_LED_SPEED 0x12
#define NOUVEAU_DSM_POWER 0x03
#define NOUVEAU_DSM_POWER_STATE 0x00
#define NOUVEAU_DSM_POWER_SPEED 0x01
#define NOUVEAU_DSM_POWER_STAMINA 0x02
static struct nouveau_dsm_priv {
bool dsm_detected;
acpi_handle dhandle;
acpi_handle dsm_handle;
} nouveau_dsm_priv;
static const char nouveau_dsm_muid[] = {
0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
};
static int nouveau_dsm(acpi_handle handle, int func, int arg, int *result)
{
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;
input.pointer = params;
params[0].type = ACPI_TYPE_BUFFER;
params[0].buffer.length = sizeof(nouveau_dsm_muid);
params[0].buffer.pointer = (char *)nouveau_dsm_muid;
params[1].type = ACPI_TYPE_INTEGER;
params[1].integer.value = 0x00000102;
params[2].type = ACPI_TYPE_INTEGER;
params[2].integer.value = func;
params[3].type = ACPI_TYPE_INTEGER;
params[3].integer.value = arg;
err = acpi_evaluate_object(handle, "_DSM", &input, &output);
if (err) {
printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
return err;
}
obj = (union acpi_object *)output.pointer;
if (obj->type == ACPI_TYPE_INTEGER)
if (obj->integer.value == 0x80000002)
return -ENODEV;
if (obj->type == ACPI_TYPE_BUFFER) {
if (obj->buffer.length == 4 && result) {
*result = 0;
*result |= obj->buffer.pointer[0];
*result |= (obj->buffer.pointer[1] << 8);
*result |= (obj->buffer.pointer[2] << 16);
*result |= (obj->buffer.pointer[3] << 24);
}
}
kfree(output.pointer);
return 0;
}
static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
{
return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL);
}
static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
{
int arg;
if (state == VGA_SWITCHEROO_ON)
arg = NOUVEAU_DSM_POWER_SPEED;
else
arg = NOUVEAU_DSM_POWER_STAMINA;
nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg, NULL);
return 0;
}
static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
{
if (id == VGA_SWITCHEROO_IGD)
return nouveau_dsm_switch_mux(nouveau_dsm_priv.dsm_handle, NOUVEAU_DSM_LED_STAMINA);
else
return nouveau_dsm_switch_mux(nouveau_dsm_priv.dsm_handle, NOUVEAU_DSM_LED_SPEED);
}
static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
enum vga_switcheroo_state state)
{
if (id == VGA_SWITCHEROO_IGD)
return 0;
return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dsm_handle, state);
}
static int nouveau_dsm_init(void)
{
return 0;
}
static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
{
if (nouveau_dsm_priv.dhandle == DEVICE_ACPI_HANDLE(&pdev->dev))
return VGA_SWITCHEROO_IGD;
else
return VGA_SWITCHEROO_DIS;
}
static struct vga_switcheroo_handler nouveau_dsm_handler = {
.switchto = nouveau_dsm_switchto,
.power_state = nouveau_dsm_power_state,
.init = nouveau_dsm_init,
.get_client_id = nouveau_dsm_get_client_id,
};
static bool nouveau_dsm_pci_probe(struct pci_dev *pdev)
{
acpi_handle dhandle, nvidia_handle;
acpi_status status;
int ret;
uint32_t result;
dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
if (!dhandle)
return false;
status = acpi_get_handle(dhandle, "_DSM", &nvidia_handle);
if (ACPI_FAILURE(status)) {
return false;
}
ret= nouveau_dsm(nvidia_handle, NOUVEAU_DSM_SUPPORTED,
NOUVEAU_DSM_SUPPORTED_FUNCTIONS, &result);
if (ret < 0)
return false;
nouveau_dsm_priv.dhandle = dhandle;
nouveau_dsm_priv.dsm_handle = nvidia_handle;
return true;
}
static bool nouveau_dsm_detect(void)
{
char acpi_method_name[255] = { 0 };
struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
struct pci_dev *pdev = NULL;
int has_dsm = 0;
int vga_count = 0;
while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
vga_count++;
has_dsm |= (nouveau_dsm_pci_probe(pdev) == true);
}
if (vga_count == 2 && has_dsm) {
acpi_get_name(nouveau_dsm_priv.dsm_handle, ACPI_FULL_PATHNAME, &buffer);
printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
acpi_method_name);
nouveau_dsm_priv.dsm_detected = true;
return true;
}
return false;
}
void nouveau_register_dsm_handler(void)
{
bool r;
r = nouveau_dsm_detect();
if (!r)
return;
vga_switcheroo_register_handler(&nouveau_dsm_handler);
}
void nouveau_unregister_dsm_handler(void)
{
vga_switcheroo_unregister_handler();
}
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