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[2403:580a:80ed:0:4835:5a07:49e7:f115]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29498cf3f4asm4728885ad.11.2025.10.24.17.25.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 24 Oct 2025 17:25:54 -0700 (PDT) From: James Calligeros Date: Sat, 25 Oct 2025 10:24:39 +1000 Subject: [PATCH v4 08/11] input: macsmc-input: New driver to handle the Apple Mac SMC buttons/lid Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251025-macsmc-subdevs-v4-8-374d5c9eba0e@gmail.com> References: <20251025-macsmc-subdevs-v4-0-374d5c9eba0e@gmail.com> In-Reply-To: <20251025-macsmc-subdevs-v4-0-374d5c9eba0e@gmail.com> To: Sven Peter , Janne Grunau , Alyssa Rosenzweig , Neal Gompa , Lee Jones , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Alexandre Belloni , Jean Delvare , Guenter Roeck , Dmitry Torokhov , Jonathan Corbet , James Calligeros Cc: asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rtc@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-input@vger.kernel.org, linux-doc@vger.kernel.org, Hector Martin X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=9156; i=jcalligeros99@gmail.com; h=from:subject:message-id; bh=rPeCGfdEO5Pface1zsJfI5Bq+ssOoaIL0E4UGeysAXE=; b=owGbwMvMwCV2xczoYuD3ygTG02pJDBl/JM7Vsm/YljVRKbzuukhK8LVF+1NEFjaIP9ltdM3DY X1Rd65vx0QWBjEuBksxRZYNTUIes43YbvaLVO6FmcPKBDJEWqSBAQhYGPhyE/NKjXSM9Ey1DfUM DXWMdYwYuDgFYKoPLWNk2M7MofIle/bUKA6+F7s+p19b2ta31tDgLJsei8Kj0JplDxj+2amFyl7 ZofNfbDXjTO7EJ/dy5lk8VF7c09EQspMlbb0bEwA= X-Developer-Key: i=jcalligeros99@gmail.com; a=openpgp; fpr=B08212489B3206D98F1479BDD43632D151F77960 From: Hector Martin This driver implements power button and lid switch support for Apple Mac devices using SMC controllers driven by the macsmc driver. In addition to basic input support, this also responds to the final shutdown warning (when the power button is held down long enough) by doing an emergency kernel poweroff. This allows the NVMe controller to be cleanly shut down, which prevents data loss for in-cache data. Reviewed-by: Neal Gompa Signed-off-by: Hector Martin Co-developed-by: Sven Peter Signed-off-by: Sven Peter Signed-off-by: James Calligeros --- MAINTAINERS | 1 + drivers/input/misc/Kconfig | 11 ++ drivers/input/misc/Makefile | 1 + drivers/input/misc/macsmc-input.c | 208 +++++++++++++++++++++++++ 4 files changed, 221 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 79b9f40224a9..e8283f127f11 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2451,6 +2451,7 @@ F: drivers/hwmon/macsmc-hwmon.c F: drivers/pmdomain/apple/ F: drivers/i2c/busses/i2c-pasemi-core.c F: drivers/i2c/busses/i2c-pasemi-platform.c +F: drivers/input/misc/macsmc-input.c F: drivers/input/touchscreen/apple_z2.c F: drivers/iommu/apple-dart.c F: drivers/iommu/io-pgtable-dart.c diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig index 0e6b49fb54bc..109660a1a5d2 100644 --- a/drivers/input/misc/Kconfig +++ b/drivers/input/misc/Kconfig @@ -981,4 +981,15 @@ config INPUT_STPMIC1_ONKEY To compile this driver as a module, choose M here: the module will be called stpmic1_onkey. =20 +config INPUT_MACSMC + tristate "Apple Mac SMC lid/buttons" + depends on MFD_MACSMC + help + Say Y here if you want to use the input events delivered via the + SMC controller on Apple Mac machines using the macsmc driver. + This includes lid open/close and the power button. + + To compile this driver as a module, choose M here: the + module will be called macsmc-input. + endif diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile index ae857c24f48e..480a0d08d4ae 100644 --- a/drivers/input/misc/Makefile +++ b/drivers/input/misc/Makefile @@ -51,6 +51,7 @@ obj-$(CONFIG_INPUT_IQS7222) +=3D iqs7222.o obj-$(CONFIG_INPUT_KEYSPAN_REMOTE) +=3D keyspan_remote.o obj-$(CONFIG_INPUT_KXTJ9) +=3D kxtj9.o obj-$(CONFIG_INPUT_M68K_BEEP) +=3D m68kspkr.o +obj-$(CONFIG_INPUT_MACSMC_INPUT) +=3D macsmc-input.o obj-$(CONFIG_INPUT_MAX7360_ROTARY) +=3D max7360-rotary.o obj-$(CONFIG_INPUT_MAX77650_ONKEY) +=3D max77650-onkey.o obj-$(CONFIG_INPUT_MAX77693_HAPTIC) +=3D max77693-haptic.o diff --git a/drivers/input/misc/macsmc-input.c b/drivers/input/misc/macsmc-= input.c new file mode 100644 index 000000000000..d35322856526 --- /dev/null +++ b/drivers/input/misc/macsmc-input.c @@ -0,0 +1,208 @@ +// SPDX-License-Identifier: GPL-2.0-only OR MIT +/* + * Apple SMC input event driver + * Copyright The Asahi Linux Contributors + * + * This driver exposes certain events from the SMC as an input device. + * This includes the lid open/close and power button notifications. + */ + +#include +#include +#include +#include +#include +#include + +/** + * struct macsmc_input + * @dev: Underlying struct device for the input sub-device + * @smc: Pointer to apple_smc struct of the mfd parent + * @input: Allocated input_dev; devres managed + * @nb: Notifier block used for incoming events from SMC (e.g. button pres= sed down) + * @wakeup_mode: Set to true when system is suspended and power button eve= nts should wake it + */ +struct macsmc_input { + struct device *dev; + struct apple_smc *smc; + struct input_dev *input; + struct notifier_block nb; + bool wakeup_mode; +}; + +#define SMC_EV_BTN 0x7201 +#define SMC_EV_LID 0x7203 + +#define BTN_POWER 0x01 /* power button on e.g. Mac Mini chasis pressed */ +#define BTN_TOUCHID 0x06 /* combined TouchID / power button on MacBooks p= ressed */ +#define BTN_POWER_HELD_SHORT 0xfe /* power button briefly held down */ +#define BTN_POWER_HELD_LONG 0x00 /* power button held down; sent just befo= re forced poweroff */ + +static void macsmc_input_event_button(struct macsmc_input *smcin, unsigned= long event) +{ + u8 button =3D (event >> 8) & 0xff; + u8 state =3D !!(event & 0xff); + + switch (button) { + case BTN_POWER: + case BTN_TOUCHID: + pm_wakeup_dev_event(smcin->dev, 0, (smcin->wakeup_mode && state)); + + /* Suppress KEY_POWER event to prevent immediate shutdown on wake */ + if (smcin->wakeup_mode) + return; + + input_report_key(smcin->input, KEY_POWER, state); + input_sync(smcin->input); + break; + case BTN_POWER_HELD_SHORT: /* power button held down; ignore */ + break; + case BTN_POWER_HELD_LONG: + /* + * If we get here the power button has been held down for a while and + * we have about 4 seconds before forced power-off is triggered by SMC. + * Try to do an emergency shutdown to make sure the NVMe cache is + * flushed. macOS actually does this by panicing (!)... + */ + if (state) { + dev_crit(smcin->dev, "Triggering forced shutdown!\n"); + if (kernel_can_power_off()) + kernel_power_off(); + else /* Missing macsmc-reboot driver? */ + kernel_restart("SMC power button triggered restart"); + } + break; + default: + dev_warn(smcin->dev, "Unknown SMC button event: %04lx\n", event & 0xffff= ); + } +} + +static void macsmc_input_event_lid(struct macsmc_input *smcin, unsigned lo= ng event) +{ + u8 lid_state =3D !!((event >> 8) & 0xff); + + pm_wakeup_dev_event(smcin->dev, 0, (smcin->wakeup_mode && !lid_state)); + input_report_switch(smcin->input, SW_LID, lid_state); + input_sync(smcin->input); +} + +static int macsmc_input_event(struct notifier_block *nb, unsigned long eve= nt, void *data) +{ + struct macsmc_input *smcin =3D container_of(nb, struct macsmc_input, nb); + u16 type =3D event >> 16; + + switch (type) { + case SMC_EV_BTN: + macsmc_input_event_button(smcin, event); + return NOTIFY_OK; + case SMC_EV_LID: + macsmc_input_event_lid(smcin, event); + return NOTIFY_OK; + default: + /* SMC event meant for another driver */ + return NOTIFY_DONE; + } +} + +static int macsmc_input_probe(struct platform_device *pdev) +{ + struct apple_smc *smc =3D dev_get_drvdata(pdev->dev.parent); + struct macsmc_input *smcin; + bool have_lid, have_power; + int error; + + /* Bail early if this SMC neither supports power button nor lid events */ + have_lid =3D apple_smc_key_exists(smc, SMC_KEY(MSLD)); + have_power =3D apple_smc_key_exists(smc, SMC_KEY(bHLD)); + if (!have_lid && !have_power) + return -ENODEV; + + smcin =3D devm_kzalloc(&pdev->dev, sizeof(*smcin), GFP_KERNEL); + if (!smcin) + return -ENOMEM; + + smcin->dev =3D &pdev->dev; + smcin->smc =3D smc; + platform_set_drvdata(pdev, smcin); + + smcin->input =3D devm_input_allocate_device(&pdev->dev); + if (!smcin->input) + return -ENOMEM; + + smcin->input->phys =3D "macsmc-input (0)"; + smcin->input->name =3D "Apple SMC power/lid events"; + + if (have_lid) + input_set_capability(smcin->input, EV_SW, SW_LID); + if (have_power) + input_set_capability(smcin->input, EV_KEY, KEY_POWER); + + if (have_lid) { + u8 val; + + error =3D apple_smc_read_u8(smc, SMC_KEY(MSLD), &val); + if (error < 0) + dev_warn(&pdev->dev, "Failed to read initial lid state\n"); + else + input_report_switch(smcin->input, SW_LID, val); + } + + if (have_power) { + u32 val; + + error =3D apple_smc_read_u32(smc, SMC_KEY(bHLD), &val); + if (error < 0) + dev_warn(&pdev->dev, "Failed to read initial power button state\n"); + else + input_report_key(smcin->input, KEY_POWER, val & 1); + } + + error =3D input_register_device(smcin->input); + if (error) { + dev_err(&pdev->dev, "Failed to register input device: %d\n", error); + return error; + } + + input_sync(smcin->input); + + smcin->nb.notifier_call =3D macsmc_input_event; + blocking_notifier_chain_register(&smc->event_handlers, &smcin->nb); + + device_init_wakeup(&pdev->dev, true); + + return 0; +} + +static int macsmc_input_pm_prepare(struct device *dev) +{ + struct macsmc_input *smcin =3D dev_get_drvdata(dev); + + smcin->wakeup_mode =3D true; + return 0; +} + +static void macsmc_input_pm_complete(struct device *dev) +{ + struct macsmc_input *smcin =3D dev_get_drvdata(dev); + + smcin->wakeup_mode =3D false; +} + +static const struct dev_pm_ops macsmc_input_pm_ops =3D { + .prepare =3D macsmc_input_pm_prepare, + .complete =3D macsmc_input_pm_complete, +}; + +static struct platform_driver macsmc_input_driver =3D { + .driver =3D { + .name =3D "macsmc-input", + .pm =3D &macsmc_input_pm_ops, + }, + .probe =3D macsmc_input_probe, +}; +module_platform_driver(macsmc_input_driver); + +MODULE_AUTHOR("Hector Martin "); +MODULE_LICENSE("Dual MIT/GPL"); +MODULE_DESCRIPTION("Apple SMC input driver"); +MODULE_ALIAS("platform:macsmc-input"); --=20 2.51.0