summaryrefslogtreecommitdiffstats
path: root/drivers/platform/x86/apple-gmux.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/platform/x86/apple-gmux.c')
-rw-r--r--drivers/platform/x86/apple-gmux.c426
1 files changed, 402 insertions, 24 deletions
diff --git a/drivers/platform/x86/apple-gmux.c b/drivers/platform/x86/apple-gmux.c
index 905fa01..dfb1a92 100644
--- a/drivers/platform/x86/apple-gmux.c
+++ b/drivers/platform/x86/apple-gmux.c
@@ -2,6 +2,7 @@
* Gmux driver for Apple laptops
*
* Copyright (C) Canonical Ltd. <seth.forshee@canonical.com>
+ * Copyright (C) 2010-2012 Andreas Heider <andreas@meetr.de>
*
* 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
@@ -18,16 +19,30 @@
#include <linux/pnp.h>
#include <linux/apple_bl.h>
#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/pci.h>
+#include <linux/vga_switcheroo.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;
+
+ /* switcheroo data */
+ acpi_handle dhandle;
+ int gpe;
+ enum vga_switcheroo_client_id resume_client_id;
+ enum vga_switcheroo_state power_state;
+ struct completion powerchange_done;
};
+static struct apple_gmux_data *apple_gmux_data;
+
/*
* 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.
@@ -45,6 +60,9 @@ struct apple_gmux_data {
#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)
@@ -59,22 +77,172 @@ struct apple_gmux_data {
#define GMUX_BRIGHTNESS_MASK 0x00ffffff
#define GMUX_MAX_BRIGHTNESS GMUX_BRIGHTNESS_MASK
-static inline u8 gmux_read8(struct apple_gmux_data *gmux_data, int port)
+static u8 gmux_pio_read8(struct apple_gmux_data *gmux_data, int port)
{
return inb(gmux_data->iostart + port);
}
-static inline void gmux_write8(struct apple_gmux_data *gmux_data, int port,
+static void gmux_pio_write8(struct apple_gmux_data *gmux_data, int port,
u8 val)
{
outb(val, gmux_data->iostart + port);
}
-static inline u32 gmux_read32(struct apple_gmux_data *gmux_data, int 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);
@@ -90,16 +258,7 @@ static int gmux_update_status(struct backlight_device *bd)
if (bd->props.state & BL_CORE_SUSPENDED)
return 0;
- /*
- * Older gmux versions require writing out lower bytes first then
- * setting the upper byte to 0 to flush the values. Newer versions
- * accept a single u32 write, but the old method also works, so we
- * just use the old method for all gmux versions.
- */
- gmux_write8(gmux_data, GMUX_PORT_BRIGHTNESS, brightness);
- gmux_write8(gmux_data, GMUX_PORT_BRIGHTNESS + 1, brightness >> 8);
- gmux_write8(gmux_data, GMUX_PORT_BRIGHTNESS + 2, brightness >> 16);
- gmux_write8(gmux_data, GMUX_PORT_BRIGHTNESS + 3, 0);
+ gmux_write32(gmux_data, GMUX_PORT_BRIGHTNESS, brightness);
return 0;
}
@@ -110,6 +269,146 @@ static const struct backlight_ops gmux_bl_ops = {
.update_status = gmux_update_status,
};
+static int gmux_switchto(enum vga_switcheroo_client_id id)
+{
+ if (id == VGA_SWITCHEROO_IGD) {
+ gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_DDC, 1);
+ gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_DISPLAY, 2);
+ gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_EXTERNAL, 2);
+ } else {
+ gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_DDC, 2);
+ gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_DISPLAY, 3);
+ gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_EXTERNAL, 3);
+ }
+
+ return 0;
+}
+
+static int gmux_set_discrete_state(struct apple_gmux_data *gmux_data,
+ enum vga_switcheroo_state state)
+{
+ INIT_COMPLETION(gmux_data->powerchange_done);
+
+ if (state == VGA_SWITCHEROO_ON) {
+ gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, 1);
+ gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, 3);
+ pr_debug("Discrete card powered up\n");
+ } else {
+ gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, 1);
+ gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, 0);
+ pr_debug("Discrete card powered down\n");
+ }
+
+ gmux_data->power_state = state;
+
+ if (gmux_data->gpe >= 0 &&
+ !wait_for_completion_interruptible_timeout(&gmux_data->powerchange_done,
+ msecs_to_jiffies(200)))
+ pr_warn("Timeout waiting for gmux switch to complete\n");
+
+ return 0;
+}
+
+static int gmux_set_power_state(enum vga_switcheroo_client_id id,
+ enum vga_switcheroo_state state)
+{
+ if (id == VGA_SWITCHEROO_IGD)
+ return 0;
+
+ return gmux_set_discrete_state(apple_gmux_data, state);
+}
+
+static int gmux_get_client_id(struct pci_dev *pdev)
+{
+ /*
+ * Early Macbook Pros with switchable graphics use nvidia
+ * integrated graphics. Hardcode that the 9400M is integrated.
+ */
+ if (pdev->vendor == PCI_VENDOR_ID_INTEL)
+ return VGA_SWITCHEROO_IGD;
+ else if (pdev->vendor == PCI_VENDOR_ID_NVIDIA &&
+ pdev->device == 0x0863)
+ return VGA_SWITCHEROO_IGD;
+ else
+ return VGA_SWITCHEROO_DIS;
+}
+
+static enum vga_switcheroo_client_id
+gmux_active_client(struct apple_gmux_data *gmux_data)
+{
+ if (gmux_read8(gmux_data, GMUX_PORT_SWITCH_DISPLAY) == 2)
+ return VGA_SWITCHEROO_IGD;
+
+ return VGA_SWITCHEROO_DIS;
+}
+
+static struct vga_switcheroo_handler gmux_handler = {
+ .switchto = gmux_switchto,
+ .power_state = gmux_set_power_state,
+ .get_client_id = gmux_get_client_id,
+};
+
+static inline void gmux_disable_interrupts(struct apple_gmux_data *gmux_data)
+{
+ gmux_write8(gmux_data, GMUX_PORT_INTERRUPT_ENABLE,
+ GMUX_INTERRUPT_DISABLE);
+}
+
+static inline void gmux_enable_interrupts(struct apple_gmux_data *gmux_data)
+{
+ gmux_write8(gmux_data, GMUX_PORT_INTERRUPT_ENABLE,
+ GMUX_INTERRUPT_ENABLE);
+}
+
+static inline u8 gmux_interrupt_get_status(struct apple_gmux_data *gmux_data)
+{
+ return gmux_read8(gmux_data, GMUX_PORT_INTERRUPT_STATUS);
+}
+
+static void gmux_clear_interrupts(struct apple_gmux_data *gmux_data)
+{
+ u8 status;
+
+ /* to clear interrupts write back current status */
+ status = gmux_interrupt_get_status(gmux_data);
+ gmux_write8(gmux_data, GMUX_PORT_INTERRUPT_STATUS, status);
+}
+
+static void gmux_notify_handler(acpi_handle device, u32 value, void *context)
+{
+ u8 status;
+ struct pnp_dev *pnp = (struct pnp_dev *)context;
+ struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp);
+
+ status = gmux_interrupt_get_status(gmux_data);
+ gmux_disable_interrupts(gmux_data);
+ pr_debug("Notify handler called: status %d\n", status);
+
+ gmux_clear_interrupts(gmux_data);
+ gmux_enable_interrupts(gmux_data);
+
+ if (status & GMUX_INTERRUPT_STATUS_POWER)
+ complete(&gmux_data->powerchange_done);
+}
+
+static int gmux_suspend(struct pnp_dev *pnp, pm_message_t state)
+{
+ struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp);
+ gmux_data->resume_client_id = gmux_active_client(gmux_data);
+ gmux_disable_interrupts(gmux_data);
+ return 0;
+}
+
+static int gmux_resume(struct pnp_dev *pnp)
+{
+ struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp);
+ gmux_enable_interrupts(gmux_data);
+ gmux_switchto(gmux_data->resume_client_id);
+ if (gmux_data->power_state == VGA_SWITCHEROO_OFF)
+ gmux_set_discrete_state(gmux_data, gmux_data->power_state);
+ return 0;
+}
+
static int __devinit gmux_probe(struct pnp_dev *pnp,
const struct pnp_device_id *id)
{
@@ -119,6 +418,11 @@ static int __devinit gmux_probe(struct pnp_dev *pnp,
struct backlight_device *bdev;
u8 ver_major, ver_minor, ver_release;
int ret = -ENXIO;
+ acpi_status status;
+ unsigned long long gpe;
+
+ if (apple_gmux_data)
+ return -EBUSY;
gmux_data = kzalloc(sizeof(*gmux_data), GFP_KERNEL);
if (!gmux_data)
@@ -147,22 +451,29 @@ static int __devinit gmux_probe(struct pnp_dev *pnp,
}
/*
- * On some machines the gmux is in ACPI even thought the machine
- * doesn't really have a gmux. Check for invalid version information
- * to detect this.
+ * Invalid version information may indicate either that the gmux
+ * device isn't present or that it's a new one that uses indexed
+ * io
*/
+
ver_major = gmux_read8(gmux_data, GMUX_PORT_VERSION_MAJOR);
ver_minor = gmux_read8(gmux_data, GMUX_PORT_VERSION_MINOR);
ver_release = gmux_read8(gmux_data, GMUX_PORT_VERSION_RELEASE);
if (ver_major == 0xff && ver_minor == 0xff && ver_release == 0xff) {
- pr_info("gmux device not present\n");
- ret = -ENODEV;
- goto err_release;
+ if (gmux_is_indexed(gmux_data)) {
+ mutex_init(&gmux_data->index_lock);
+ gmux_data->indexed = true;
+ } else {
+ pr_info("gmux device not present\n");
+ ret = -ENODEV;
+ goto err_release;
+ }
+ pr_info("Found indexed gmux\n");
+ } else {
+ pr_info("Found gmux version %d.%d.%d\n", ver_major, ver_minor,
+ ver_release);
}
- pr_info("Found gmux version %d.%d.%d\n", ver_major, ver_minor,
- ver_release);
-
memset(&props, 0, sizeof(props));
props.type = BACKLIGHT_PLATFORM;
props.max_brightness = gmux_read32(gmux_data, GMUX_PORT_MAX_BRIGHTNESS);
@@ -194,13 +505,67 @@ static int __devinit gmux_probe(struct pnp_dev *pnp,
* Disable the other backlight choices.
*/
acpi_video_dmi_promote_vendor();
-#ifdef CONFIG_ACPI_VIDEO
+#if defined (CONFIG_ACPI_VIDEO) || defined (CONFIG_ACPI_VIDEO_MODULE)
acpi_video_unregister();
#endif
apple_bl_unregister();
+ gmux_data->power_state = VGA_SWITCHEROO_ON;
+
+ gmux_data->dhandle = DEVICE_ACPI_HANDLE(&pnp->dev);
+ if (!gmux_data->dhandle) {
+ pr_err("Cannot find acpi handle for pnp device %s\n",
+ dev_name(&pnp->dev));
+ ret = -ENODEV;
+ goto err_notify;
+ }
+
+ status = acpi_evaluate_integer(gmux_data->dhandle, "GMGP", NULL, &gpe);
+ if (ACPI_SUCCESS(status)) {
+ gmux_data->gpe = (int)gpe;
+
+ status = acpi_install_notify_handler(gmux_data->dhandle,
+ ACPI_DEVICE_NOTIFY,
+ &gmux_notify_handler, pnp);
+ if (ACPI_FAILURE(status)) {
+ pr_err("Install notify handler failed: %s\n",
+ acpi_format_exception(status));
+ ret = -ENODEV;
+ goto err_notify;
+ }
+
+ status = acpi_enable_gpe(NULL, gmux_data->gpe);
+ if (ACPI_FAILURE(status)) {
+ pr_err("Cannot enable gpe: %s\n",
+ acpi_format_exception(status));
+ goto err_enable_gpe;
+ }
+ } else {
+ pr_warn("No GPE found for gmux\n");
+ gmux_data->gpe = -1;
+ }
+
+ if (vga_switcheroo_register_handler(&gmux_handler)) {
+ ret = -ENODEV;
+ goto err_register_handler;
+ }
+
+ init_completion(&gmux_data->powerchange_done);
+ apple_gmux_data = gmux_data;
+ gmux_enable_interrupts(gmux_data);
+
return 0;
+err_register_handler:
+ if (gmux_data->gpe >= 0)
+ acpi_disable_gpe(NULL, gmux_data->gpe);
+err_enable_gpe:
+ if (gmux_data->gpe >= 0)
+ acpi_remove_notify_handler(gmux_data->dhandle,
+ ACPI_DEVICE_NOTIFY,
+ &gmux_notify_handler);
+err_notify:
+ backlight_device_unregister(bdev);
err_release:
release_region(gmux_data->iostart, gmux_data->iolen);
err_free:
@@ -212,12 +577,23 @@ static void __devexit gmux_remove(struct pnp_dev *pnp)
{
struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp);
+ vga_switcheroo_unregister_handler();
+ gmux_disable_interrupts(gmux_data);
+ if (gmux_data->gpe >= 0) {
+ acpi_disable_gpe(NULL, gmux_data->gpe);
+ acpi_remove_notify_handler(gmux_data->dhandle,
+ ACPI_DEVICE_NOTIFY,
+ &gmux_notify_handler);
+ }
+
backlight_device_unregister(gmux_data->bdev);
+
release_region(gmux_data->iostart, gmux_data->iolen);
+ apple_gmux_data = NULL;
kfree(gmux_data);
acpi_video_dmi_demote_vendor();
-#ifdef CONFIG_ACPI_VIDEO
+#if defined (CONFIG_ACPI_VIDEO) || defined (CONFIG_ACPI_VIDEO_MODULE)
acpi_video_register();
#endif
apple_bl_register();
@@ -233,6 +609,8 @@ static struct pnp_driver gmux_pnp_driver = {
.probe = gmux_probe,
.remove = __devexit_p(gmux_remove),
.id_table = gmux_device_ids,
+ .suspend = gmux_suspend,
+ .resume = gmux_resume
};
static int __init apple_gmux_init(void)
OpenPOWER on IntegriCloud