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Message-ID: <20240906093630.2428329-3-bigfoot@classfun.cn>
Date: Fri, 6 Sep 2024 17:36:23 +0800
From: Junhao Xie <bigfoot@...ssfun.cn>
To: devicetree@...r.kernel.org,
linux-hwmon@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-leds@...r.kernel.org,
linux-pm@...r.kernel.org,
linux-rtc@...r.kernel.org,
linux-watchdog@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-rockchip@...ts.infradead.org
Cc: Jean Delvare <jdelvare@...e.com>,
Guenter Roeck <linux@...ck-us.net>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Pavel Machek <pavel@....cz>,
Lee Jones <lee@...nel.org>,
Sebastian Reichel <sre@...nel.org>,
Alexandre Belloni <alexandre.belloni@...tlin.com>,
Wim Van Sebroeck <wim@...ux-watchdog.org>,
Heiko Stuebner <heiko@...ech.de>,
Chukun Pan <amadeus@....edu.cn>,
Junhao Xie <bigfoot@...ssfun.cn>
Subject: [PATCH 2/9] power: reset: add Photonicat PMU poweroff driver
This driver implements the shutdown function of Photonicat PMU:
- Host notifies PMU to shutdown:
When powering off, a shutdown command (0x0F) needs to be sent
to the MCU.
- PMU notifies host to shutdown:
If the power button is long pressed, the MCU will send a shutdown
command (0x0D) to the system.
If system does not shutdown within 60 seconds,
the power will be turned off directly.
Signed-off-by: Junhao Xie <bigfoot@...ssfun.cn>
---
drivers/power/reset/Kconfig | 12 +++
drivers/power/reset/Makefile | 1 +
drivers/power/reset/photonicat-poweroff.c | 95 +++++++++++++++++++++++
3 files changed, 108 insertions(+)
create mode 100644 drivers/power/reset/photonicat-poweroff.c
diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
index fece990af4a7..c59529ce25a2 100644
--- a/drivers/power/reset/Kconfig
+++ b/drivers/power/reset/Kconfig
@@ -148,6 +148,18 @@ config POWER_RESET_ODROID_GO_ULTRA_POWEROFF
help
This driver supports Power off for Odroid Go Ultra device.
+config POWER_RESET_PHOTONICAT_POWEROFF
+ tristate "Photonicat PMU power-off driver"
+ depends on MFD_PHOTONICAT_PMU
+ help
+ This driver supports Power off for Photonicat PMU device.
+
+ Supports operations:
+ Host notifies PMU to shutdown
+ PMU notifies host to shutdown
+
+ Say Y if you have a Photonicat board.
+
config POWER_RESET_PIIX4_POWEROFF
tristate "Intel PIIX4 power-off driver"
depends on PCI
diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
index a95d1bd275d1..339b36812b95 100644
--- a/drivers/power/reset/Makefile
+++ b/drivers/power/reset/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_POWER_RESET_MT6323) += mt6323-poweroff.o
obj-$(CONFIG_POWER_RESET_QCOM_PON) += qcom-pon.o
obj-$(CONFIG_POWER_RESET_OCELOT_RESET) += ocelot-reset.o
obj-$(CONFIG_POWER_RESET_ODROID_GO_ULTRA_POWEROFF) += odroid-go-ultra-poweroff.o
+obj-$(CONFIG_POWER_RESET_PHOTONICAT_POWEROFF) += photonicat-poweroff.o
obj-$(CONFIG_POWER_RESET_PIIX4_POWEROFF) += piix4-poweroff.o
obj-$(CONFIG_POWER_RESET_LTC2952) += ltc2952-poweroff.o
obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o
diff --git a/drivers/power/reset/photonicat-poweroff.c b/drivers/power/reset/photonicat-poweroff.c
new file mode 100644
index 000000000000..f9f1ea179247
--- /dev/null
+++ b/drivers/power/reset/photonicat-poweroff.c
@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2024 Junhao Xie <bigfoot@...ssfun.cn>
+ */
+
+#include <linux/mfd/photonicat-pmu.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+
+struct pcat_poweroff {
+ struct device *dev;
+ struct pcat_pmu *pmu;
+ struct notifier_block nb;
+};
+
+static int pcat_do_poweroff(struct sys_off_data *data)
+{
+ struct pcat_poweroff *poweroff = data->cb_data;
+
+ dev_info(poweroff->dev, "Host request PMU shutdown\n");
+ pcat_pmu_write_data(poweroff->pmu, PCAT_CMD_HOST_REQUEST_SHUTDOWN,
+ NULL, 0);
+
+ return NOTIFY_DONE;
+}
+
+static int pcat_poweroff_notify(struct notifier_block *nb, unsigned long action,
+ void *data)
+{
+ struct pcat_poweroff *poweroff =
+ container_of(nb, struct pcat_poweroff, nb);
+
+ if (action != PCAT_CMD_PMU_REQUEST_SHUTDOWN)
+ return NOTIFY_DONE;
+
+ dev_info(poweroff->dev, "PMU request host shutdown\n");
+ orderly_poweroff(true);
+
+ return NOTIFY_DONE;
+}
+
+static int pcat_poweroff_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct device *dev = &pdev->dev;
+ struct pcat_poweroff *poweroff;
+
+ poweroff = devm_kzalloc(dev, sizeof(*poweroff), GFP_KERNEL);
+ if (!poweroff)
+ return -ENOMEM;
+
+ poweroff->dev = dev;
+ poweroff->pmu = dev_get_drvdata(dev->parent);
+ poweroff->nb.notifier_call = pcat_poweroff_notify;
+ platform_set_drvdata(pdev, poweroff);
+
+ ret = devm_register_sys_off_handler(&pdev->dev,
+ SYS_OFF_MODE_POWER_OFF,
+ SYS_OFF_PRIO_DEFAULT,
+ pcat_do_poweroff,
+ poweroff);
+ if (ret)
+ return ret;
+
+ return pcat_pmu_register_notify(poweroff->pmu, &poweroff->nb);
+}
+
+static void pcat_poweroff_remove(struct platform_device *pdev)
+{
+ struct pcat_poweroff *poweroff = platform_get_drvdata(pdev);
+
+ pcat_pmu_unregister_notify(poweroff->pmu, &poweroff->nb);
+}
+
+static const struct of_device_id pcat_poweroff_dt_ids[] = {
+ { .compatible = "ariaboard,photonicat-pmu-poweroff", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, pcat_poweroff_dt_ids);
+
+static struct platform_driver pcat_poweroff_driver = {
+ .driver = {
+ .name = "photonicat-poweroff",
+ .of_match_table = pcat_poweroff_dt_ids,
+ },
+ .probe = pcat_poweroff_probe,
+ .remove = pcat_poweroff_remove,
+};
+module_platform_driver(pcat_poweroff_driver);
+
+MODULE_AUTHOR("Junhao Xie <bigfoot@...ssfun.cn>");
+MODULE_DESCRIPTION("Photonicat PMU Poweroff");
+MODULE_LICENSE("GPL");
--
2.46.0
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