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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>
#include "radeon_acpi.h"
struct radeon_atpx_functions {
bool px_params;
bool power_cntl;
bool disp_mux_cntl;
bool i2c_mux_cntl;
bool switch_start;
bool switch_end;
bool disp_connectors_mapping;
bool disp_detetion_ports;
};
struct radeon_atpx {
struct radeon_atpx_functions functions;
};
static struct radeon_atpx_priv {
bool atpx_detected;
/* handle for device - and atpx */
acpi_handle dhandle;
acpi_handle atpx_handle;
struct radeon_atpx atpx;
} radeon_atpx_priv;
struct atpx_verify_interface {
u16 size; /* structure size in bytes (includes size field) */
u16 version; /* version */
u32 function_bits; /* supported functions bit vector */
} __packed;
/**
* radeon_atpx_call - call an ATPX method
*
* @handle: acpi handle
* @function: the ATPX function to execute
* @params: ATPX function params
*
* Executes the requested ATPX function (all asics).
* Returns a pointer to the acpi output buffer.
*/
static union acpi_object *radeon_atpx_call(acpi_handle handle, int function,
struct acpi_buffer *params)
{
acpi_status status;
union acpi_object atpx_arg_elements[2];
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 = function;
if (params) {
atpx_arg_elements[1].type = ACPI_TYPE_BUFFER;
atpx_arg_elements[1].buffer.length = params->length;
atpx_arg_elements[1].buffer.pointer = params->pointer;
} else {
/* We need a second fake parameter */
atpx_arg_elements[1].type = ACPI_TYPE_INTEGER;
atpx_arg_elements[1].integer.value = 0;
}
status = acpi_evaluate_object(handle, "ATPX", &atpx_arg, &buffer);
/* Fail only if calling the method fails and ATPX is supported */
if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
printk("failed to evaluate ATPX got %s\n",
acpi_format_exception(status));
kfree(buffer.pointer);
return NULL;
}
return buffer.pointer;
}
/**
* radeon_atpx_parse_functions - parse supported functions
*
* @f: supported functions struct
* @mask: supported functions mask from ATPX
*
* Use the supported functions mask from ATPX function
* ATPX_FUNCTION_VERIFY_INTERFACE to determine what functions
* are supported (all asics).
*/
static void radeon_atpx_parse_functions(struct radeon_atpx_functions *f, u32 mask)
{
f->px_params = mask & ATPX_GET_PX_PARAMETERS_SUPPORTED;
f->power_cntl = mask & ATPX_POWER_CONTROL_SUPPORTED;
f->disp_mux_cntl = mask & ATPX_DISPLAY_MUX_CONTROL_SUPPORTED;
f->i2c_mux_cntl = mask & ATPX_I2C_MUX_CONTROL_SUPPORTED;
f->switch_start = mask & ATPX_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION_SUPPORTED;
f->switch_end = mask & ATPX_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION_SUPPORTED;
f->disp_connectors_mapping = mask & ATPX_GET_DISPLAY_CONNECTORS_MAPPING_SUPPORTED;
f->disp_detetion_ports = mask & ATPX_GET_DISPLAY_DETECTION_PORTS_SUPPORTED;
}
/**
* radeon_atpx_verify_interface - verify ATPX
*
* @handle: acpi handle
* @atpx: radeon atpx struct
*
* Execute the ATPX_FUNCTION_VERIFY_INTERFACE ATPX function
* to initialize ATPX and determine what features are supported
* (all asics).
* returns 0 on success, error on failure.
*/
static int radeon_atpx_verify_interface(acpi_handle handle,
struct radeon_atpx *atpx)
{
union acpi_object *info;
struct atpx_verify_interface output;
size_t size;
int err = 0;
info = radeon_atpx_call(handle, ATPX_FUNCTION_VERIFY_INTERFACE, NULL);
if (!info)
return -EIO;
memset(&output, 0, sizeof(output));
size = *(u16 *) info->buffer.pointer;
if (size < 8) {
printk("ATPX buffer is too small: %lu\n", size);
err = -EINVAL;
goto out;
}
size = min(sizeof(output), size);
memcpy(&output, info->buffer.pointer, size);
/* TODO: check version? */
printk("ATPX version %u\n", output.version);
radeon_atpx_parse_functions(&atpx->functions, output.function_bits);
out:
kfree(info);
return err;
}
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_FUNCTION_POWER_CONTROL, state);
}
static int radeon_atpx_switch_mux(acpi_handle handle, int mux_id)
{
return radeon_atpx_execute(handle, ATPX_FUNCTION_DISPLAY_MUX_CONTROL, mux_id);
}
static int radeon_atpx_switch_i2c_mux(acpi_handle handle, int mux_id)
{
return radeon_atpx_execute(handle, ATPX_FUNCTION_I2C_MUX_CONTROL, mux_id);
}
static int radeon_atpx_switch_start(acpi_handle handle, int gpu_id)
{
return radeon_atpx_execute(handle,
ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION,
gpu_id);
}
static int radeon_atpx_switch_end(acpi_handle handle, int gpu_id)
{
return radeon_atpx_execute(handle,
ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION,
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_GPU;
else
gpu_id = ATPX_DISCRETE_GPU;
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 */
return radeon_atpx_verify_interface(radeon_atpx_priv.atpx_handle,
&radeon_atpx_priv.atpx);
}
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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