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Subject[PATCH v2 3/3] apple-gmux: Add display mux support
Date
From: Andreas Heider <andreas@meetr.de>

Add support for the gmux display muxing functionality and register a mux
handler with vga_switcheroo.

Signed-off-by: Andreas Heider <andreas@meetr.de>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
---
drivers/platform/x86/apple-gmux.c | 224 +++++++++++++++++++++++++++++++++++++
1 file changed, 224 insertions(+)
diff --git a/drivers/platform/x86/apple-gmux.c b/drivers/platform/x86/apple-gmux.c
index 612b6f6..c72e81e 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
@@ -19,6 +20,8 @@
#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>

@@ -29,8 +32,17 @@ struct apple_gmux_data {
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.
@@ -257,6 +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)
{
@@ -266,6 +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)
@@ -353,8 +510,62 @@ static int __devinit gmux_probe(struct pnp_dev *pnp,
#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:
@@ -366,8 +577,19 @@ 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();
@@ -387,6 +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)
--
1.7.9.5


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