| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Andreas Heider | 998 | 33.13% | 1 | 4.00% |
| Matthew Garrett | 848 | 28.15% | 4 | 16.00% |
| Seth Forshee | 667 | 22.14% | 3 | 12.00% |
| Lukas Wunner | 374 | 12.42% | 9 | 36.00% |
| Bernhard Froemel | 65 | 2.16% | 2 | 8.00% |
| Shuah Khan | 49 | 1.63% | 1 | 4.00% |
| Hans de Goede | 4 | 0.13% | 1 | 4.00% |
| Wolfram Sang | 2 | 0.07% | 1 | 4.00% |
| Peter Hüwe | 2 | 0.07% | 1 | 4.00% |
| Luc Van Oostenryck | 2 | 0.07% | 1 | 4.00% |
| Rafael J. Wysocki | 1 | 0.03% | 1 | 4.00% |
| Total | 3012 | 25 |
/* * Gmux driver for Apple laptops * * Copyright (C) Canonical Ltd. <seth.forshee@canonical.com> * Copyright (C) 2010-2012 Andreas Heider <andreas@meetr.de> * Copyright (C) 2015 Lukas Wunner <lukas@wunner.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 * 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/apple-gmux.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> /** * DOC: Overview * * gmux is a microcontroller built into the MacBook Pro to support dual GPUs: * A `Lattice XP2`_ on pre-retinas, a `Renesas R4F2113`_ on retinas. * * (The MacPro6,1 2013 also has a gmux, however it is unclear why since it has * dual GPUs but no built-in display.) * * gmux is connected to the LPC bus of the southbridge. Its I/O ports are * accessed differently depending on the microcontroller: Driver functions * to access a pre-retina gmux are infixed ``_pio_``, those for a retina gmux * are infixed ``_index_``. * * .. _Lattice XP2: * http://www.latticesemi.com/en/Products/FPGAandCPLD/LatticeXP2.aspx * .. _Renesas R4F2113: * http://www.renesas.com/products/mpumcu/h8s/h8s2100/h8s2113/index.jsp */ 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; bool external_switchable; enum vga_switcheroo_client_id switch_state_display; enum vga_switcheroo_client_id switch_state_ddc; enum vga_switcheroo_client_id switch_state_external; 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. */ #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, gmux_data->iostart + 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); gmux_index_wait_ready(gmux_data); outb((port & 0xff), gmux_data->iostart + GMUX_PORT_READ); gmux_index_wait_complete(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); gmux_index_wait_ready(gmux_data); outb((port & 0xff), gmux_data->iostart + GMUX_PORT_READ); gmux_index_wait_complete(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; } /** * DOC: Backlight control * * On single GPU MacBooks, the PWM signal for the backlight is generated by * the GPU. On dual GPU MacBook Pros by contrast, either GPU may be suspended * to conserve energy. Hence the PWM signal needs to be generated by a separate * backlight driver which is controlled by gmux. The earliest generation * MBP5 2008/09 uses a `TI LP8543`_ backlight driver. All newer models * use a `TI LP8545`_. * * .. _TI LP8543: http://www.ti.com/lit/ds/symlink/lp8543.pdf * .. _TI LP8545: http://www.ti.com/lit/ds/symlink/lp8545.pdf */ 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, }; /** * DOC: Graphics mux * * On pre-retinas, the LVDS outputs of both GPUs feed into gmux which muxes * either of them to the panel. One of the tricks gmux has up its sleeve is * to lengthen the blanking interval of its output during a switch to * synchronize it with the GPU switched to. This allows for a flicker-free * switch that is imperceptible by the user (`US 8,687,007 B2`_). * * On retinas, muxing is no longer done by gmux itself, but by a separate * chip which is controlled by gmux. The chip is triple sourced, it is * either an `NXP CBTL06142`_, `TI HD3SS212`_ or `Pericom PI3VDP12412`_. * The panel is driven with eDP instead of LVDS since the pixel clock * required for retina resolution exceeds LVDS' limits. * * Pre-retinas are able to switch the panel's DDC pins separately. * This is handled by a `TI SN74LV4066A`_ which is controlled by gmux. * The inactive GPU can thus probe the panel's EDID without switching over * the entire panel. Retinas lack this functionality as the chips used for * eDP muxing are incapable of switching the AUX channel separately (see * the linked data sheets, Pericom would be capable but this is unused). * However the retina panel has the NO_AUX_HANDSHAKE_LINK_TRAINING bit set * in its DPCD, allowing the inactive GPU to skip the AUX handshake and * set up the output with link parameters pre-calibrated by the active GPU. * * The external DP port is only fully switchable on the first two unibody * MacBook Pro generations, MBP5 2008/09 and MBP6 2010. This is done by an * `NXP CBTL06141`_ which is controlled by gmux. It's the predecessor of the * eDP mux on retinas, the difference being support for 2.7 versus 5.4 Gbit/s. * * The following MacBook Pro generations replaced the external DP port with a * combined DP/Thunderbolt port and lost the ability to switch it between GPUs, * connecting it either to the discrete GPU or the Thunderbolt controller. * Oddly enough, while the full port is no longer switchable, AUX and HPD * are still switchable by way of an `NXP CBTL03062`_ (on pre-retinas * MBP8 2011 and MBP9 2012) or two `TI TS3DS10224`_ (on retinas) under the * control of gmux. Since the integrated GPU is missing the main link, * external displays appear to it as phantoms which fail to link-train. * * gmux receives the HPD signal of all display connectors and sends an * interrupt on hotplug. On generations which cannot switch external ports, * the discrete GPU can then be woken to drive the newly connected display. * The ability to switch AUX on these generations could be used to improve * reliability of hotplug detection by having the integrated GPU poll the * ports while the discrete GPU is asleep, but currently we do not make use * of this feature. * * Our switching policy for the external port is that on those generations * which are able to switch it fully, the port is switched together with the * panel when IGD / DIS commands are issued to vga_switcheroo. It is thus * possible to drive e.g. a beamer on battery power with the integrated GPU. * The user may manually switch to the discrete GPU if more performance is * needed. * * On all newer generations, the external port can only be driven by the * discrete GPU. If a display is plugged in while the panel is switched to * the integrated GPU, *both* GPUs will be in use for maximum performance. * To decrease power consumption, the user may manually switch to the * discrete GPU, thereby suspending the integrated GPU. * * gmux' initial switch state on bootup is user configurable via the EFI * variable ``gpu-power-prefs-fa4ce28d-b62f-4c99-9cc3-6815686e30f9`` (5th byte, * 1 = IGD, 0 = DIS). Based on this setting, the EFI firmware tells gmux to * switch the panel and the external DP connector and allocates a framebuffer * for the selected GPU. * * .. _US 8,687,007 B2: http://pimg-fpiw.uspto.gov/fdd/07/870/086/0.pdf * .. _NXP CBTL06141: http://www.nxp.com/documents/data_sheet/CBTL06141.pdf * .. _NXP CBTL06142: http://www.nxp.com/documents/data_sheet/CBTL06141.pdf * .. _TI HD3SS212: http://www.ti.com/lit/ds/symlink/hd3ss212.pdf * .. _Pericom PI3VDP12412: https://www.pericom.com/assets/Datasheets/PI3VDP12412.pdf * .. _TI SN74LV4066A: http://www.ti.com/lit/ds/symlink/sn74lv4066a.pdf * .. _NXP CBTL03062: http://pdf.datasheetarchive.com/indexerfiles/Datasheets-SW16/DSASW00308511.pdf * .. _TI TS3DS10224: http://www.ti.com/lit/ds/symlink/ts3ds10224.pdf */ static void gmux_read_switch_state(struct apple_gmux_data *gmux_data) { if (gmux_read8(gmux_data, GMUX_PORT_SWITCH_DDC) == 1) gmux_data->switch_state_ddc = VGA_SWITCHEROO_IGD; else gmux_data->switch_state_ddc = VGA_SWITCHEROO_DIS; if (gmux_read8(gmux_data, GMUX_PORT_SWITCH_DISPLAY) == 2) gmux_data->switch_state_display = VGA_SWITCHEROO_IGD; else gmux_data->switch_state_display = VGA_SWITCHEROO_DIS; if (gmux_read8(gmux_data, GMUX_PORT_SWITCH_EXTERNAL) == 2) gmux_data->switch_state_external = VGA_SWITCHEROO_IGD; else gmux_data->switch_state_external = VGA_SWITCHEROO_DIS; } static void gmux_write_switch_state(struct apple_gmux_data *gmux_data) { if (gmux_data->switch_state_ddc == VGA_SWITCHEROO_IGD) gmux_write8(gmux_data, GMUX_PORT_SWITCH_DDC, 1); else gmux_write8(gmux_data, GMUX_PORT_SWITCH_DDC, 2); if (gmux_data->switch_state_display == VGA_SWITCHEROO_IGD) gmux_write8(gmux_data, GMUX_PORT_SWITCH_DISPLAY, 2); else gmux_write8(gmux_data, GMUX_PORT_SWITCH_DISPLAY, 3); if (gmux_data->switch_state_external == VGA_SWITCHEROO_IGD) gmux_write8(gmux_data, GMUX_PORT_SWITCH_EXTERNAL, 2); else gmux_write8(gmux_data, GMUX_PORT_SWITCH_EXTERNAL, 3); } static int gmux_switchto(enum vga_switcheroo_client_id id) { apple_gmux_data->switch_state_ddc = id; apple_gmux_data->switch_state_display = id; if (apple_gmux_data->external_switchable) apple_gmux_data->switch_state_external = id; gmux_write_switch_state(apple_gmux_data); return 0; } static int gmux_switch_ddc(enum vga_switcheroo_client_id id) { enum vga_switcheroo_client_id old_ddc_owner = apple_gmux_data->switch_state_ddc; if (id == old_ddc_owner) return id; pr_debug("Switching DDC from %d to %d\n", old_ddc_owner, id); apple_gmux_data->switch_state_ddc = id; if (id == VGA_SWITCHEROO_IGD) gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_DDC, 1); else gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_DDC, 2); return old_ddc_owner; } /** * DOC: Power control * * gmux is able to cut power to the discrete GPU. It automatically takes care * of the correct sequence to tear down and bring up the power rails for * core voltage, VRAM and PCIe. */ static int gmux_set_discrete_state(struct apple_gmux_data *gmux_data, enum vga_switcheroo_state state) { reinit_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 enum vga_switcheroo_client_id 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 const struct vga_switcheroo_handler gmux_handler_indexed = { .switchto = gmux_switchto, .power_state = gmux_set_power_state, .get_client_id = gmux_get_client_id, }; static const struct vga_switcheroo_handler gmux_handler_classic = { .switchto = gmux_switchto, .switch_ddc = gmux_switch_ddc, .power_state = gmux_set_power_state, .get_client_id = gmux_get_client_id, }; /** * DOC: Interrupt * * gmux is also connected to a GPIO pin of the southbridge and thereby is able * to trigger an ACPI GPE. On the MBP5 2008/09 it's GPIO pin 22 of the Nvidia * MCP79, on all following generations it's GPIO pin 6 of the Intel PCH. * The GPE merely signals that an interrupt occurred, the actual type of event * is identified by reading a gmux register. */ 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 device *dev) { struct pnp_dev *pnp = to_pnp_dev(dev); struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp); gmux_disable_interrupts(gmux_data); return 0; } static int gmux_resume(struct device *dev) { struct pnp_dev *pnp = to_pnp_dev(dev); struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp); gmux_enable_interrupts(gmux_data); gmux_write_switch_state(gmux_data); if (gmux_data->power_state == VGA_SWITCHEROO_OFF) gmux_set_discrete_state(gmux_data, gmux_data->power_state); return 0; } static int is_thunderbolt(struct device *dev, void *data) { return to_pci_dev(dev)->is_thunderbolt; } static int 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; acpi_status status; unsigned long long gpe; if (apple_gmux_data) return -EBUSY; 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 to find gmux I/O resource\n"); goto err_free; } gmux_data->iostart = res->start; gmux_data->iolen = res->end - res->start; if (gmux_data->iolen < GMUX_MIN_IO_LEN) { pr_err("gmux I/O region too small (%lu < %u)\n", gmux_data->iolen, GMUX_MIN_IO_LEN); goto err_free; } if (!request_region(gmux_data->iostart, gmux_data->iolen, "Apple gmux")) { pr_err("gmux I/O already in use\n"); goto err_free; } /* * 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) { if (gmux_is_indexed(gmux_data)) { u32 version; mutex_init(&gmux_data->index_lock); gmux_data->indexed = true; version = gmux_read32(gmux_data, GMUX_PORT_VERSION_MAJOR); ver_major = (version >> 24) & 0xff; ver_minor = (version >> 16) & 0xff; ver_release = (version >> 8) & 0xff; } else { pr_info("gmux device not present\n"); ret = -ENODEV; goto err_release; } } pr_info("Found gmux version %d.%d.%d [%s]\n", ver_major, ver_minor, ver_release, (gmux_data->indexed ? "indexed" : "classic")); memset(&props, 0, sizeof(props)); props.type = BACKLIGHT_PLATFORM; props.max_brightness = gmux_read32(gmux_data, GMUX_PORT_MAX_BRIGHTNESS); /* * Currently it's assumed that the maximum brightness is less than * 2^24 for compatibility with old gmux versions. Cap the max * brightness at this value, but print a warning if the hardware * reports something higher so that it can be fixed. */ if (WARN_ON(props.max_brightness > GMUX_MAX_BRIGHTNESS)) props.max_brightness = GMUX_MAX_BRIGHTNESS; bdev = backlight_device_register("gmux_backlight", &pnp->dev, gmux_data, &gmux_bl_ops, &props); if (IS_ERR(bdev)) { ret = PTR_ERR(bdev); goto err_release; } gmux_data->bdev = bdev; bdev->props.brightness = gmux_get_brightness(bdev); backlight_update_status(bdev); /* * The backlight situation on Macs is complicated. If the gmux is * present it's the best choice, because it always works for * backlight control and supports more levels than other options. * Disable the other backlight choices. */ acpi_video_set_dmi_backlight_type(acpi_backlight_vendor); apple_bl_unregister(); gmux_data->power_state = VGA_SWITCHEROO_ON; gmux_data->dhandle = 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 Thunderbolt is present, the external DP port is not fully * switchable. Force its AUX channel to the discrete GPU. */ gmux_data->external_switchable = !bus_for_each_dev(&pci_bus_type, NULL, NULL, is_thunderbolt); if (!gmux_data->external_switchable) gmux_write8(gmux_data, GMUX_PORT_SWITCH_EXTERNAL, 3); apple_gmux_data = gmux_data; init_completion(&gmux_data->powerchange_done); gmux_enable_interrupts(gmux_data); gmux_read_switch_state(gmux_data); /* * Retina MacBook Pros cannot switch the panel's AUX separately * and need eDP pre-calibration. They are distinguishable from * pre-retinas by having an "indexed" gmux. * * Pre-retina MacBook Pros can switch the panel's DDC separately. */ if (gmux_data->indexed) ret = vga_switcheroo_register_handler(&gmux_handler_indexed, VGA_SWITCHEROO_NEEDS_EDP_CONFIG); else ret = vga_switcheroo_register_handler(&gmux_handler_classic, VGA_SWITCHEROO_CAN_SWITCH_DDC); if (ret) { pr_err("Failed to register vga_switcheroo handler\n"); goto err_register_handler; } return 0; err_register_handler: gmux_disable_interrupts(gmux_data); apple_gmux_data = NULL; 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: kfree(gmux_data); return ret; } static void 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_register(); apple_bl_register(); } static const struct pnp_device_id gmux_device_ids[] = { {GMUX_ACPI_HID, 0}, {"", 0} }; static const struct dev_pm_ops gmux_dev_pm_ops = { .suspend = gmux_suspend, .resume = gmux_resume, }; static struct pnp_driver gmux_pnp_driver = { .name = "apple-gmux", .probe = gmux_probe, .remove = gmux_remove, .id_table = gmux_device_ids, .driver = { .pm = &gmux_dev_pm_ops, }, }; module_pnp_driver(gmux_pnp_driver); MODULE_AUTHOR("Seth Forshee <seth.forshee@canonical.com>"); MODULE_DESCRIPTION("Apple Gmux Driver"); MODULE_LICENSE("GPL"); MODULE_DEVICE_TABLE(pnp, gmux_device_ids);
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