apple-gmux: Add display mux support

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>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

1 files changed, 224 insertions, 0 deletions

diff --git a/drivers/platform/x86/apple-gmux.c b/drivers/platform/x86/apple-gmux.c
index 85e1bfbd1121..dfb1a92ce949 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)