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// SPDX-License-Identifier: GPL-2.0-only OR MIT
/*
* Apple SMC input event driver
* Copyright The Asahi Linux Contributors
*
* This driver exposes HID events from the SMC as an input device.
* This includes the lid open/close and power button notifications.
*/
#include <linux/device.h>
#include <linux/input.h>
#include <linux/mfd/core.h>
#include <linux/mfd/macsmc.h>
#include <linux/reboot.h>
struct macsmc_hid {
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 0x06
#define BTN_POWER_HELD1 0xfe
#define BTN_POWER_HELD2 0x00
static int macsmc_hid_event(struct notifier_block *nb, unsigned long event, void *data)
{
struct macsmc_hid *smchid = container_of(nb, struct macsmc_hid, nb);
u16 type = event >> 16;
u8 d1 = (event >> 8) & 0xff;
u8 d2 = event & 0xff;
switch (type) {
case SMC_EV_BTN:
switch (d1) {
case BTN_POWER:
if (smchid->wakeup_mode) {
if (d2) {
dev_info(smchid->dev, "Button wakeup\n");
pm_wakeup_hard_event(smchid->dev);
}
} else {
input_report_key(smchid->input, KEY_POWER, d2);
input_sync(smchid->input);
}
break;
case BTN_POWER_HELD1:
/*
* TODO: is this pre-warning useful?
*/
if (d2)
dev_warn(smchid->dev, "Power button held down\n");
break;
case BTN_POWER_HELD2:
/*
* If we get here, we have about 4 seconds before forced shutdown.
* Try to do an emergency shutdown to make sure the NVMe cache is
* flushed. macOS actually does this by panicing (!)...
*/
if (d2) {
dev_crit(smchid->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_info(smchid->dev, "Unknown SMC button event: %02x %02x\n", d1, d2);
break;
}
return NOTIFY_OK;
case SMC_EV_LID:
if (smchid->wakeup_mode && !d1) {
dev_info(smchid->dev, "Lid wakeup\n");
pm_wakeup_hard_event(smchid->dev);
}
input_report_switch(smchid->input, SW_LID, d1);
input_sync(smchid->input);
return NOTIFY_OK;
}
return NOTIFY_DONE;
}
static int macsmc_hid_probe(struct platform_device *pdev)
{
struct apple_smc *smc = dev_get_drvdata(pdev->dev.parent);
struct macsmc_hid *smchid;
bool have_lid, have_power;
int ret;
have_lid = apple_smc_key_exists(smc, SMC_KEY(MSLD));
have_power = apple_smc_key_exists(smc, SMC_KEY(bHLD));
if (!have_lid && !have_power)
return -ENODEV;
smchid = devm_kzalloc(&pdev->dev, sizeof(*smchid), GFP_KERNEL);
if (!smchid)
return -ENOMEM;
smchid->dev = &pdev->dev;
smchid->smc = smc;
platform_set_drvdata(pdev, smchid);
smchid->input = devm_input_allocate_device(&pdev->dev);
if (!smchid->input)
return -ENOMEM;
smchid->input->phys = "macsmc-hid (0)";
smchid->input->name = "Apple SMC power/lid events";
if (have_lid)
input_set_capability(smchid->input, EV_SW, SW_LID);
if (have_power)
input_set_capability(smchid->input, EV_KEY, KEY_POWER);
ret = input_register_device(smchid->input);
if (ret) {
dev_err(&pdev->dev, "Failed to register input device: %d\n", ret);
return ret;
}
if (have_lid) {
u8 val;
ret = apple_smc_read_u8(smc, SMC_KEY(MSLD), &val);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to read initial lid state\n");
} else {
input_report_switch(smchid->input, SW_LID, val);
}
}
if (have_power) {
u32 val;
ret = apple_smc_read_u32(smc, SMC_KEY(bHLD), &val);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to read initial power button state\n");
} else {
input_report_key(smchid->input, KEY_POWER, val & 1);
}
}
input_sync(smchid->input);
smchid->nb.notifier_call = macsmc_hid_event;
apple_smc_register_notifier(smc, &smchid->nb);
device_init_wakeup(&pdev->dev, 1);
return 0;
}
static int macsmc_hid_pm_prepare(struct device *dev)
{
struct macsmc_hid *smchid = dev_get_drvdata(dev);
smchid->wakeup_mode = true;
return 0;
}
static void macsmc_hid_pm_complete(struct device *dev)
{
struct macsmc_hid *smchid = dev_get_drvdata(dev);
smchid->wakeup_mode = false;
}
static const struct dev_pm_ops macsmc_hid_pm_ops = {
.prepare = macsmc_hid_pm_prepare,
.complete = macsmc_hid_pm_complete,
};
static struct platform_driver macsmc_hid_driver = {
.driver = {
.name = "macsmc-hid",
.owner = THIS_MODULE,
.pm = &macsmc_hid_pm_ops,
},
.probe = macsmc_hid_probe,
};
module_platform_driver(macsmc_hid_driver);
MODULE_AUTHOR("Hector Martin <marcan@marcan.st>");
MODULE_LICENSE("Dual MIT/GPL");
MODULE_DESCRIPTION("Apple SMC GPIO driver");
MODULE_ALIAS("platform:macsmc-hid");
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