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/*
* Copyright (c) 2010 Red Hat Inc.
* Author : Dave Airlie <airlied@redhat.com>
*
* Licensed under GPLv2
*
* ATPX support for both Intel/ATI
*/
#include <linux/vga_switcheroo.h>
#include <linux/slab.h>
#include <acpi/acpi.h>
#include <acpi/acpi_bus.h>
#include <linux/pci.h>
#define ATPX_VERSION 0
#define ATPX_GPU_PWR 2
#define ATPX_MUX_SELECT 3
#define ATPX_I2C_MUX_SELECT 4
#define ATPX_SWITCH_START 5
#define ATPX_SWITCH_END 6
#define ATPX_INTEGRATED 0
#define ATPX_DISCRETE 1
#define ATPX_MUX_IGD 0
#define ATPX_MUX_DISCRETE 1
static struct radeon_atpx_priv {
bool atpx_detected;
/* handle for device - and atpx */
acpi_handle dhandle;
acpi_handle atpx_handle;
} radeon_atpx_priv;
static int radeon_atpx_get_version(acpi_handle handle)
{
acpi_status status;
union acpi_object atpx_arg_elements[2], *obj;
struct acpi_object_list atpx_arg;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
atpx_arg.count = 2;
atpx_arg.pointer = &atpx_arg_elements[0];
atpx_arg_elements[0].type = ACPI_TYPE_INTEGER;
atpx_arg_elements[0].integer.value = ATPX_VERSION;
atpx_arg_elements[1].type = ACPI_TYPE_INTEGER;
atpx_arg_elements[1].integer.value = ATPX_VERSION;
status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);
if (ACPI_FAILURE(status)) {
printk("%s: failed to call ATPX: %s\n", __func__, acpi_format_exception(status));
return -ENOSYS;
}
obj = (union acpi_object *)buffer.pointer;
if (obj && (obj->type == ACPI_TYPE_BUFFER))
printk(KERN_INFO "radeon atpx: version is %d\n", *((u8 *)(obj->buffer.pointer) + 2));
kfree(buffer.pointer);
return 0;
}
static int radeon_atpx_execute(acpi_handle handle, int cmd_id, u16 value)
{
acpi_status status;
union acpi_object atpx_arg_elements[2];
struct acpi_object_list atpx_arg;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
uint8_t buf[4] = {0};
if (!handle)
return -EINVAL;
atpx_arg.count = 2;
atpx_arg.pointer = &atpx_arg_elements[0];
atpx_arg_elements[0].type = ACPI_TYPE_INTEGER;
atpx_arg_elements[0].integer.value = cmd_id;
buf[2] = value & 0xff;
buf[3] = (value >> 8) & 0xff;
atpx_arg_elements[1].type = ACPI_TYPE_BUFFER;
atpx_arg_elements[1].buffer.length = 4;
atpx_arg_elements[1].buffer.pointer = buf;
status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);
if (ACPI_FAILURE(status)) {
printk("%s: failed to call ATPX: %s\n", __func__, acpi_format_exception(status));
return -ENOSYS;
}
kfree(buffer.pointer);
return 0;
}
static int radeon_atpx_set_discrete_state(acpi_handle handle, int state)
{
return radeon_atpx_execute(handle, ATPX_GPU_PWR, state);
}
static int radeon_atpx_switch_mux(acpi_handle handle, int mux_id)
{
return radeon_atpx_execute(handle, ATPX_MUX_SELECT, mux_id);
}
static int radeon_atpx_switch_i2c_mux(acpi_handle handle, int mux_id)
{
return radeon_atpx_execute(handle, ATPX_I2C_MUX_SELECT, mux_id);
}
static int radeon_atpx_switch_start(acpi_handle handle, int gpu_id)
{
return radeon_atpx_execute(handle, ATPX_SWITCH_START, gpu_id);
}
static int radeon_atpx_switch_end(acpi_handle handle, int gpu_id)
{
return radeon_atpx_execute(handle, ATPX_SWITCH_END, gpu_id);
}
static int radeon_atpx_switchto(enum vga_switcheroo_client_id id)
{
int gpu_id;
if (id == VGA_SWITCHEROO_IGD)
gpu_id = ATPX_INTEGRATED;
else
gpu_id = ATPX_DISCRETE;
radeon_atpx_switch_start(radeon_atpx_priv.atpx_handle, gpu_id);
radeon_atpx_switch_mux(radeon_atpx_priv.atpx_handle, gpu_id);
radeon_atpx_switch_i2c_mux(radeon_atpx_priv.atpx_handle, gpu_id);
radeon_atpx_switch_end(radeon_atpx_priv.atpx_handle, gpu_id);
return 0;
}
static int radeon_atpx_power_state(enum vga_switcheroo_client_id id,
enum vga_switcheroo_state state)
{
/* on w500 ACPI can't change intel gpu state */
if (id == VGA_SWITCHEROO_IGD)
return 0;
radeon_atpx_set_discrete_state(radeon_atpx_priv.atpx_handle, state);
return 0;
}
static bool radeon_atpx_pci_probe_handle(struct pci_dev *pdev)
{
acpi_handle dhandle, atpx_handle;
acpi_status status;
dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
if (!dhandle)
return false;
status = acpi_get_handle(dhandle, "ATPX", &atpx_handle);
if (ACPI_FAILURE(status))
return false;
radeon_atpx_priv.dhandle = dhandle;
radeon_atpx_priv.atpx_handle = atpx_handle;
return true;
}
static int radeon_atpx_init(void)
{
/* set up the ATPX handle */
radeon_atpx_get_version(radeon_atpx_priv.atpx_handle);
return 0;
}
static int radeon_atpx_get_client_id(struct pci_dev *pdev)
{
if (radeon_atpx_priv.dhandle == DEVICE_ACPI_HANDLE(&pdev->dev))
return VGA_SWITCHEROO_IGD;
else
return VGA_SWITCHEROO_DIS;
}
static struct vga_switcheroo_handler radeon_atpx_handler = {
.switchto = radeon_atpx_switchto,
.power_state = radeon_atpx_power_state,
.init = radeon_atpx_init,
.get_client_id = radeon_atpx_get_client_id,
};
static bool radeon_atpx_detect(void)
{
char acpi_method_name[255] = { 0 };
struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
struct pci_dev *pdev = NULL;
bool has_atpx = false;
int vga_count = 0;
while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
vga_count++;
has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true);
}
if (has_atpx && vga_count == 2) {
acpi_get_name(radeon_atpx_priv.atpx_handle, ACPI_FULL_PATHNAME, &buffer);
printk(KERN_INFO "VGA switcheroo: detected switching method %s handle\n",
acpi_method_name);
radeon_atpx_priv.atpx_detected = true;
return true;
}
return false;
}
void radeon_register_atpx_handler(void)
{
bool r;
/* detect if we have any ATPX + 2 VGA in the system */
r = radeon_atpx_detect();
if (!r)
return;
vga_switcheroo_register_handler(&radeon_atpx_handler);
}
void radeon_unregister_atpx_handler(void)
{
vga_switcheroo_unregister_handler();
}
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