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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181/* SPDX-License-Identifier: GPL-2.0-only *//* * apple-gmux.h - microcontroller built into dual GPU MacBook Pro & Mac Pro * Copyright (C) 2015 Lukas Wunner <lukas@wunner.de> */
#ifndef LINUX_APPLE_GMUX_H#define LINUX_APPLE_GMUX_H
#include <linux/acpi.h>#include <linux/io.h>#include <linux/pnp.h>
#define GMUX_ACPI_HID "APP000B"
/* * 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_MMIO_PORT_SELECT 0x0e#define GMUX_MMIO_COMMAND_SEND 0x0f
#define GMUX_MMIO_READ 0x00#define GMUX_MMIO_WRITE 0x40
#define GMUX_MIN_IO_LEN (GMUX_PORT_BRIGHTNESS + 4)
enum apple_gmux_type { APPLE_GMUX_TYPE_PIO, APPLE_GMUX_TYPE_INDEXED, APPLE_GMUX_TYPE_MMIO,};
#if IS_ENABLED(CONFIG_APPLE_GMUX)static inline bool apple_gmux_is_indexed(unsigned long iostart){ u16 val;
outb(0xaa, iostart + 0xcc); outb(0x55, iostart + 0xcd); outb(0x00, iostart + 0xce);
val = inb(iostart + 0xcc) | (inb(iostart + 0xcd) << 8); if (val == 0x55aa) return true;
return false;}
static inline bool apple_gmux_is_mmio(unsigned long iostart){ u8 __iomem *iomem_base = ioremap(iostart, 16); u8 val;
if (!iomem_base) return false;
/* * If this is 0xff, then gmux must not be present, as the gmux would * reset it to 0x00, or it would be one of 0x1, 0x4, 0x41, 0x44 if a * command is currently being processed. */ val = ioread8(iomem_base + GMUX_MMIO_COMMAND_SEND); iounmap(iomem_base); return (val != 0xff);}
/** * apple_gmux_detect() - detect if gmux is built into the machine * * @pnp_dev: Device to probe or NULL to use the first matching device * @type_ret: Returns (by reference) the apple_gmux_type of the device * * Detect if a supported gmux device is present by actually probing it. * This avoids the false positives returned on some models by * apple_gmux_present(). * * Return: %true if a supported gmux ACPI device is detected and the kernel * was configured with CONFIG_APPLE_GMUX, %false otherwise. */static inline bool apple_gmux_detect(struct pnp_dev *pnp_dev, enum apple_gmux_type *type_ret){ u8 ver_major, ver_minor, ver_release; struct device *dev = NULL; struct acpi_device *adev; struct resource *res; enum apple_gmux_type type = APPLE_GMUX_TYPE_PIO; bool ret = false;
if (!pnp_dev) { adev = acpi_dev_get_first_match_dev(GMUX_ACPI_HID, NULL, -1); if (!adev) return false;
dev = get_device(acpi_get_first_physical_node(adev)); acpi_dev_put(adev); if (!dev) return false;
pnp_dev = to_pnp_dev(dev); }
res = pnp_get_resource(pnp_dev, IORESOURCE_IO, 0); if (res && resource_size(res) >= GMUX_MIN_IO_LEN) { /* * 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 = inb(res->start + GMUX_PORT_VERSION_MAJOR); ver_minor = inb(res->start + GMUX_PORT_VERSION_MINOR); ver_release = inb(res->start + GMUX_PORT_VERSION_RELEASE); if (ver_major == 0xff && ver_minor == 0xff && ver_release == 0xff) { if (apple_gmux_is_indexed(res->start)) type = APPLE_GMUX_TYPE_INDEXED; else goto out; } } else { res = pnp_get_resource(pnp_dev, IORESOURCE_MEM, 0); if (res && apple_gmux_is_mmio(res->start)) type = APPLE_GMUX_TYPE_MMIO; else goto out; }
if (type_ret) *type_ret = type;
ret = true;out: put_device(dev); return ret;}
/** * apple_gmux_present() - check if gmux ACPI device is present * * Drivers may use this to activate quirks specific to dual GPU MacBook Pros * and Mac Pros, e.g. for deferred probing, runtime pm and backlight. * * Return: %true if gmux ACPI device is present and the kernel was configured * with CONFIG_APPLE_GMUX, %false otherwise. */static inline bool apple_gmux_present(void){ return acpi_dev_found(GMUX_ACPI_HID);}
#else /* !CONFIG_APPLE_GMUX */
static inline bool apple_gmux_present(void){ return false;}
static inline bool apple_gmux_detect(struct pnp_dev *pnp_dev, bool *indexed_ret){ return false;}
#endif /* !CONFIG_APPLE_GMUX */
#endif /* LINUX_APPLE_GMUX_H */