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>wifi-calibration
Andreas Heider
Matthew Garrett
parent
f94f0f103c
commit
76b487dd51
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@ -2,6 +2,7 @@
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* Gmux driver for Apple laptops
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*
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* Copyright (C) Canonical Ltd. <seth.forshee@canonical.com>
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* Copyright (C) 2010-2012 Andreas Heider <andreas@meetr.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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@ -19,6 +20,8 @@
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#include <linux/apple_bl.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/pci.h>
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#include <linux/vga_switcheroo.h>
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#include <acpi/video.h>
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#include <asm/io.h>
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@ -29,8 +32,17 @@ struct apple_gmux_data {
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struct mutex index_lock;
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struct backlight_device *bdev;
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/* switcheroo data */
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acpi_handle dhandle;
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int gpe;
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enum vga_switcheroo_client_id resume_client_id;
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enum vga_switcheroo_state power_state;
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struct completion powerchange_done;
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};
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static struct apple_gmux_data *apple_gmux_data;
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/*
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* gmux port offsets. Many of these are not yet used, but may be in the
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* future, and it's useful to have them documented here anyhow.
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@ -257,6 +269,146 @@ static const struct backlight_ops gmux_bl_ops = {
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.update_status = gmux_update_status,
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};
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static int gmux_switchto(enum vga_switcheroo_client_id id)
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{
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if (id == VGA_SWITCHEROO_IGD) {
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gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_DDC, 1);
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gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_DISPLAY, 2);
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gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_EXTERNAL, 2);
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} else {
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gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_DDC, 2);
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gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_DISPLAY, 3);
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gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_EXTERNAL, 3);
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}
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return 0;
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}
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static int gmux_set_discrete_state(struct apple_gmux_data *gmux_data,
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enum vga_switcheroo_state state)
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{
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INIT_COMPLETION(gmux_data->powerchange_done);
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if (state == VGA_SWITCHEROO_ON) {
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gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, 1);
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gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, 3);
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pr_debug("Discrete card powered up\n");
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} else {
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gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, 1);
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gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, 0);
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pr_debug("Discrete card powered down\n");
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}
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gmux_data->power_state = state;
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if (gmux_data->gpe >= 0 &&
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!wait_for_completion_interruptible_timeout(&gmux_data->powerchange_done,
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msecs_to_jiffies(200)))
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pr_warn("Timeout waiting for gmux switch to complete\n");
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return 0;
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}
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static int gmux_set_power_state(enum vga_switcheroo_client_id id,
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enum vga_switcheroo_state state)
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{
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if (id == VGA_SWITCHEROO_IGD)
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return 0;
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return gmux_set_discrete_state(apple_gmux_data, state);
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}
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static int gmux_get_client_id(struct pci_dev *pdev)
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{
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/*
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* Early Macbook Pros with switchable graphics use nvidia
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* integrated graphics. Hardcode that the 9400M is integrated.
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*/
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if (pdev->vendor == PCI_VENDOR_ID_INTEL)
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return VGA_SWITCHEROO_IGD;
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else if (pdev->vendor == PCI_VENDOR_ID_NVIDIA &&
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pdev->device == 0x0863)
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return VGA_SWITCHEROO_IGD;
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else
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return VGA_SWITCHEROO_DIS;
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}
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static enum vga_switcheroo_client_id
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gmux_active_client(struct apple_gmux_data *gmux_data)
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{
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if (gmux_read8(gmux_data, GMUX_PORT_SWITCH_DISPLAY) == 2)
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return VGA_SWITCHEROO_IGD;
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return VGA_SWITCHEROO_DIS;
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}
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static struct vga_switcheroo_handler gmux_handler = {
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.switchto = gmux_switchto,
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.power_state = gmux_set_power_state,
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.get_client_id = gmux_get_client_id,
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};
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static inline void gmux_disable_interrupts(struct apple_gmux_data *gmux_data)
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{
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gmux_write8(gmux_data, GMUX_PORT_INTERRUPT_ENABLE,
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GMUX_INTERRUPT_DISABLE);
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}
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static inline void gmux_enable_interrupts(struct apple_gmux_data *gmux_data)
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{
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gmux_write8(gmux_data, GMUX_PORT_INTERRUPT_ENABLE,
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GMUX_INTERRUPT_ENABLE);
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}
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static inline u8 gmux_interrupt_get_status(struct apple_gmux_data *gmux_data)
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{
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return gmux_read8(gmux_data, GMUX_PORT_INTERRUPT_STATUS);
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}
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static void gmux_clear_interrupts(struct apple_gmux_data *gmux_data)
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{
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u8 status;
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/* to clear interrupts write back current status */
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status = gmux_interrupt_get_status(gmux_data);
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gmux_write8(gmux_data, GMUX_PORT_INTERRUPT_STATUS, status);
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}
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static void gmux_notify_handler(acpi_handle device, u32 value, void *context)
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{
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u8 status;
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struct pnp_dev *pnp = (struct pnp_dev *)context;
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struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp);
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status = gmux_interrupt_get_status(gmux_data);
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gmux_disable_interrupts(gmux_data);
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pr_debug("Notify handler called: status %d\n", status);
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gmux_clear_interrupts(gmux_data);
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gmux_enable_interrupts(gmux_data);
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if (status & GMUX_INTERRUPT_STATUS_POWER)
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complete(&gmux_data->powerchange_done);
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}
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static int gmux_suspend(struct pnp_dev *pnp, pm_message_t state)
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{
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struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp);
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gmux_data->resume_client_id = gmux_active_client(gmux_data);
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gmux_disable_interrupts(gmux_data);
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return 0;
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}
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static int gmux_resume(struct pnp_dev *pnp)
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{
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struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp);
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gmux_enable_interrupts(gmux_data);
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gmux_switchto(gmux_data->resume_client_id);
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if (gmux_data->power_state == VGA_SWITCHEROO_OFF)
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gmux_set_discrete_state(gmux_data, gmux_data->power_state);
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return 0;
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}
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static int __devinit gmux_probe(struct pnp_dev *pnp,
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const struct pnp_device_id *id)
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{
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@ -266,6 +418,11 @@ static int __devinit gmux_probe(struct pnp_dev *pnp,
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struct backlight_device *bdev;
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u8 ver_major, ver_minor, ver_release;
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int ret = -ENXIO;
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acpi_status status;
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unsigned long long gpe;
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if (apple_gmux_data)
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return -EBUSY;
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gmux_data = kzalloc(sizeof(*gmux_data), GFP_KERNEL);
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if (!gmux_data)
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@ -353,8 +510,62 @@ static int __devinit gmux_probe(struct pnp_dev *pnp,
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#endif
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apple_bl_unregister();
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gmux_data->power_state = VGA_SWITCHEROO_ON;
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gmux_data->dhandle = DEVICE_ACPI_HANDLE(&pnp->dev);
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if (!gmux_data->dhandle) {
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pr_err("Cannot find acpi handle for pnp device %s\n",
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dev_name(&pnp->dev));
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ret = -ENODEV;
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goto err_notify;
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}
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status = acpi_evaluate_integer(gmux_data->dhandle, "GMGP", NULL, &gpe);
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if (ACPI_SUCCESS(status)) {
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gmux_data->gpe = (int)gpe;
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status = acpi_install_notify_handler(gmux_data->dhandle,
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ACPI_DEVICE_NOTIFY,
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&gmux_notify_handler, pnp);
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if (ACPI_FAILURE(status)) {
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pr_err("Install notify handler failed: %s\n",
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acpi_format_exception(status));
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ret = -ENODEV;
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goto err_notify;
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}
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status = acpi_enable_gpe(NULL, gmux_data->gpe);
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if (ACPI_FAILURE(status)) {
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pr_err("Cannot enable gpe: %s\n",
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acpi_format_exception(status));
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goto err_enable_gpe;
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}
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} else {
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pr_warn("No GPE found for gmux\n");
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gmux_data->gpe = -1;
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}
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if (vga_switcheroo_register_handler(&gmux_handler)) {
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ret = -ENODEV;
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goto err_register_handler;
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}
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init_completion(&gmux_data->powerchange_done);
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apple_gmux_data = gmux_data;
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gmux_enable_interrupts(gmux_data);
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return 0;
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err_register_handler:
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if (gmux_data->gpe >= 0)
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acpi_disable_gpe(NULL, gmux_data->gpe);
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err_enable_gpe:
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if (gmux_data->gpe >= 0)
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acpi_remove_notify_handler(gmux_data->dhandle,
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ACPI_DEVICE_NOTIFY,
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&gmux_notify_handler);
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err_notify:
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backlight_device_unregister(bdev);
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err_release:
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release_region(gmux_data->iostart, gmux_data->iolen);
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err_free:
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@ -366,8 +577,19 @@ static void __devexit gmux_remove(struct pnp_dev *pnp)
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{
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struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp);
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vga_switcheroo_unregister_handler();
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gmux_disable_interrupts(gmux_data);
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if (gmux_data->gpe >= 0) {
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acpi_disable_gpe(NULL, gmux_data->gpe);
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acpi_remove_notify_handler(gmux_data->dhandle,
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ACPI_DEVICE_NOTIFY,
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&gmux_notify_handler);
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}
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backlight_device_unregister(gmux_data->bdev);
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release_region(gmux_data->iostart, gmux_data->iolen);
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apple_gmux_data = NULL;
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kfree(gmux_data);
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acpi_video_dmi_demote_vendor();
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@ -387,6 +609,8 @@ static struct pnp_driver gmux_pnp_driver = {
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.probe = gmux_probe,
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.remove = __devexit_p(gmux_remove),
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.id_table = gmux_device_ids,
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.suspend = gmux_suspend,
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.resume = gmux_resume
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};
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static int __init apple_gmux_init(void)
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