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/*
* Gmux driver for Apple laptops
*
* Copyright (C) Canonical Ltd. <seth.forshee@canonical.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/backlight.h>
#include <linux/acpi.h>
#include <linux/pnp.h>
#include <linux/apple_bl.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <acpi/video.h>
#include <asm/io.h>
struct apple_gmux_data {
unsigned long iostart;
unsigned long iolen;
bool indexed;
struct mutex index_lock;
struct backlight_device *bdev;
};
/*
* gmux port offsets. Many of these are not yet used, but may be in the
* future, and it's useful to have them documented here anyhow.
*/
#define GMUX_PORT_VERSION_MAJOR 0x04
#define GMUX_PORT_VERSION_MINOR 0x05
#define GMUX_PORT_VERSION_RELEASE 0x06
#define GMUX_PORT_SWITCH_DISPLAY 0x10
#define GMUX_PORT_SWITCH_GET_DISPLAY 0x11
#define GMUX_PORT_INTERRUPT_ENABLE 0x14
#define GMUX_PORT_INTERRUPT_STATUS 0x16
#define GMUX_PORT_SWITCH_DDC 0x28
#define GMUX_PORT_SWITCH_EXTERNAL 0x40
#define GMUX_PORT_SWITCH_GET_EXTERNAL 0x41
#define GMUX_PORT_DISCRETE_POWER 0x50
#define GMUX_PORT_MAX_BRIGHTNESS 0x70
#define GMUX_PORT_BRIGHTNESS 0x74
#define GMUX_PORT_VALUE 0xc2
#define GMUX_PORT_READ 0xd0
#define GMUX_PORT_WRITE 0xd4
#define GMUX_MIN_IO_LEN (GMUX_PORT_BRIGHTNESS + 4)
#define GMUX_INTERRUPT_ENABLE 0xff
#define GMUX_INTERRUPT_DISABLE 0x00
#define GMUX_INTERRUPT_STATUS_ACTIVE 0
#define GMUX_INTERRUPT_STATUS_DISPLAY (1 << 0)
#define GMUX_INTERRUPT_STATUS_POWER (1 << 2)
#define GMUX_INTERRUPT_STATUS_HOTPLUG (1 << 3)
#define GMUX_BRIGHTNESS_MASK 0x00ffffff
#define GMUX_MAX_BRIGHTNESS GMUX_BRIGHTNESS_MASK
static u8 gmux_pio_read8(struct apple_gmux_data *gmux_data, int port)
{
return inb(gmux_data->iostart + port);
}
static void gmux_pio_write8(struct apple_gmux_data *gmux_data, int port,
u8 val)
{
outb(val, gmux_data->iostart + port);
}
static u32 gmux_pio_read32(struct apple_gmux_data *gmux_data, int port)
{
return inl(gmux_data->iostart + port);
}
static void gmux_pio_write32(struct apple_gmux_data *gmux_data, int port,
u32 val)
{
int i;
u8 tmpval;
for (i = 0; i < 4; i++) {
tmpval = (val >> (i * 8)) & 0xff;
outb(tmpval, port + i);
}
}
static int gmux_index_wait_ready(struct apple_gmux_data *gmux_data)
{
int i = 200;
u8 gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE);
while (i && (gwr & 0x01)) {
inb(gmux_data->iostart + GMUX_PORT_READ);
gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE);
udelay(100);
i--;
}
return !!i;
}
static int gmux_index_wait_complete(struct apple_gmux_data *gmux_data)
{
int i = 200;
u8 gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE);
while (i && !(gwr & 0x01)) {
gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE);
udelay(100);
i--;
}
if (gwr & 0x01)
inb(gmux_data->iostart + GMUX_PORT_READ);
return !!i;
}
static u8 gmux_index_read8(struct apple_gmux_data *gmux_data, int port)
{
u8 val;
mutex_lock(&gmux_data->index_lock);
outb((port & 0xff), gmux_data->iostart + GMUX_PORT_READ);
gmux_index_wait_ready(gmux_data);
val = inb(gmux_data->iostart + GMUX_PORT_VALUE);
mutex_unlock(&gmux_data->index_lock);
return val;
}
static void gmux_index_write8(struct apple_gmux_data *gmux_data, int port,
u8 val)
{
mutex_lock(&gmux_data->index_lock);
outb(val, gmux_data->iostart + GMUX_PORT_VALUE);
gmux_index_wait_ready(gmux_data);
outb(port & 0xff, gmux_data->iostart + GMUX_PORT_WRITE);
gmux_index_wait_complete(gmux_data);
mutex_unlock(&gmux_data->index_lock);
}
static u32 gmux_index_read32(struct apple_gmux_data *gmux_data, int port)
{
u32 val;
mutex_lock(&gmux_data->index_lock);
outb((port & 0xff), gmux_data->iostart + GMUX_PORT_READ);
gmux_index_wait_ready(gmux_data);
val = inl(gmux_data->iostart + GMUX_PORT_VALUE);
mutex_unlock(&gmux_data->index_lock);
return val;
}
static void gmux_index_write32(struct apple_gmux_data *gmux_data, int port,
u32 val)
{
int i;
u8 tmpval;
mutex_lock(&gmux_data->index_lock);
for (i = 0; i < 4; i++) {
tmpval = (val >> (i * 8)) & 0xff;
outb(tmpval, gmux_data->iostart + GMUX_PORT_VALUE + i);
}
gmux_index_wait_ready(gmux_data);
outb(port & 0xff, gmux_data->iostart + GMUX_PORT_WRITE);
gmux_index_wait_complete(gmux_data);
mutex_unlock(&gmux_data->index_lock);
}
static u8 gmux_read8(struct apple_gmux_data *gmux_data, int port)
{
if (gmux_data->indexed)
return gmux_index_read8(gmux_data, port);
else
return gmux_pio_read8(gmux_data, port);
}
static void gmux_write8(struct apple_gmux_data *gmux_data, int port, u8 val)
{
if (gmux_data->indexed)
gmux_index_write8(gmux_data, port, val);
else
gmux_pio_write8(gmux_data, port, val);
}
static u32 gmux_read32(struct apple_gmux_data *gmux_data, int port)
{
if (gmux_data->indexed)
return gmux_index_read32(gmux_data, port);
else
return gmux_pio_read32(gmux_data, port);
}
static void gmux_write32(struct apple_gmux_data *gmux_data, int port,
u32 val)
{
if (gmux_data->indexed)
gmux_index_write32(gmux_data, port, val);
else
gmux_pio_write32(gmux_data, port, val);
}
static bool gmux_is_indexed(struct apple_gmux_data *gmux_data)
{
u16 val;
outb(0xaa, gmux_data->iostart + 0xcc);
outb(0x55, gmux_data->iostart + 0xcd);
outb(0x00, gmux_data->iostart + 0xce);
val = inb(gmux_data->iostart + 0xcc) |
(inb(gmux_data->iostart + 0xcd) << 8);
if (val == 0x55aa)
return true;
return false;
}
static int gmux_get_brightness(struct backlight_device *bd)
{
struct apple_gmux_data *gmux_data = bl_get_data(bd);
return gmux_read32(gmux_data, GMUX_PORT_BRIGHTNESS) &
GMUX_BRIGHTNESS_MASK;
}
static int gmux_update_status(struct backlight_device *bd)
{
struct apple_gmux_data *gmux_data = bl_get_data(bd);
u32 brightness = bd->props.brightness;
if (bd->props.state & BL_CORE_SUSPENDED)
return 0;
gmux_write32(gmux_data, GMUX_PORT_BRIGHTNESS, brightness);
return 0;
}
static const struct backlight_ops gmux_bl_ops = {
.options = BL_CORE_SUSPENDRESUME,
.get_brightness = gmux_get_brightness,
.update_status = gmux_update_status,
};
static int __devinit gmux_probe(struct pnp_dev *pnp,
const struct pnp_device_id *id)
{
struct apple_gmux_data *gmux_data;
struct resource *res;
struct backlight_properties props;
struct backlight_device *bdev;
u8 ver_major, ver_minor, ver_release;
int ret = -ENXIO;
gmux_data = kzalloc(sizeof(*gmux_data), GFP_KERNEL);
if (!gmux_data)
return -ENOMEM;
pnp_set_drvdata(pnp, gmux_data);
res = pnp_get_resource(pnp, IORESOURCE_IO, 0);
if (!res) {
pr_err("Failed
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