diff options
Diffstat (limited to 'drivers/power/reset')
| -rw-r--r-- | drivers/power/reset/Kconfig | 6 | ||||
| -rw-r--r-- | drivers/power/reset/Makefile | 1 | ||||
| -rw-r--r-- | drivers/power/reset/pwr-mlxbf.c | 97 |
3 files changed, 104 insertions, 0 deletions
diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig index 4b563db3ab3e..a8c46ba5878f 100644 --- a/drivers/power/reset/Kconfig +++ b/drivers/power/reset/Kconfig @@ -297,4 +297,10 @@ config NVMEM_REBOOT_MODE then the bootloader can read it and take different action according to the mode. +config POWER_MLXBF + tristate "Mellanox BlueField power handling driver" + depends on (GPIO_MLXBF2 && ACPI) + help + This driver supports reset or low power mode handling for Mellanox BlueField. + endif diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile index f606a2f60539..0a39424fc558 100644 --- a/drivers/power/reset/Makefile +++ b/drivers/power/reset/Makefile @@ -35,3 +35,4 @@ obj-$(CONFIG_REBOOT_MODE) += reboot-mode.o obj-$(CONFIG_SYSCON_REBOOT_MODE) += syscon-reboot-mode.o obj-$(CONFIG_POWER_RESET_SC27XX) += sc27xx-poweroff.o obj-$(CONFIG_NVMEM_REBOOT_MODE) += nvmem-reboot-mode.o +obj-$(CONFIG_POWER_MLXBF) += pwr-mlxbf.o diff --git a/drivers/power/reset/pwr-mlxbf.c b/drivers/power/reset/pwr-mlxbf.c new file mode 100644 index 000000000000..c1f9987834a2 --- /dev/null +++ b/drivers/power/reset/pwr-mlxbf.c @@ -0,0 +1,97 @@ +// SPDX-License-Identifier: GPL-2.0-only or BSD-3-Clause + +/* + * Copyright (c) 2022 NVIDIA CORPORATION & AFFILIATES. + */ + +#include <linux/acpi.h> +#include <linux/device.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/pm.h> +#include <linux/reboot.h> +#include <linux/types.h> + +const char *rst_pwr_hid = "MLNXBF24"; +const char *low_pwr_hid = "MLNXBF29"; + +struct pwr_mlxbf { + struct work_struct send_work; + const char *hid; +}; + +static void pwr_mlxbf_send_work(struct work_struct *work) +{ + acpi_bus_generate_netlink_event("button/power.*", "Power Button", 0x80, 1); +} + +static irqreturn_t pwr_mlxbf_irq(int irq, void *ptr) +{ + struct pwr_mlxbf *priv = ptr; + + if (!strncmp(priv->hid, rst_pwr_hid, 8)) + emergency_restart(); + + if (!strncmp(priv->hid, low_pwr_hid, 8)) + schedule_work(&priv->send_work); + + return IRQ_HANDLED; +} + +static int pwr_mlxbf_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct acpi_device *adev; + struct pwr_mlxbf *priv; + const char *hid; + int irq, err; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + adev = ACPI_COMPANION(dev); + if (!adev) + return -ENXIO; + + hid = acpi_device_hid(adev); + priv->hid = hid; + + irq = acpi_dev_gpio_irq_get(ACPI_COMPANION(dev), 0); + if (irq < 0) + return dev_err_probe(dev, irq, "Error getting %s irq.\n", priv->hid); + + err = devm_work_autocancel(dev, &priv->send_work, pwr_mlxbf_send_work); + if (err) + return err; + + err = devm_request_irq(dev, irq, pwr_mlxbf_irq, 0, hid, priv); + if (err) + dev_err(dev, "Failed request of %s irq\n", priv->hid); + + return err; +} + +static const struct acpi_device_id __maybe_unused pwr_mlxbf_acpi_match[] = { + { "MLNXBF24", 0 }, + { "MLNXBF29", 0 }, + {}, +}; +MODULE_DEVICE_TABLE(acpi, pwr_mlxbf_acpi_match); + +static struct platform_driver pwr_mlxbf_driver = { + .driver = { + .name = "pwr_mlxbf", + .acpi_match_table = pwr_mlxbf_acpi_match, + }, + .probe = pwr_mlxbf_probe, +}; + +module_platform_driver(pwr_mlxbf_driver); + +MODULE_DESCRIPTION("Mellanox BlueField power driver"); +MODULE_AUTHOR("Asmaa Mnebhi <asmaa@nvidia.com>"); +MODULE_LICENSE("Dual BSD/GPL"); |