From 66c331a304f41a5f1806a827b42bc97ba090c745 Mon Sep 17 00:00:00 2001 From: Asmaa Mnebhi Date: Tue, 5 Jul 2022 14:49:03 -0400 Subject: [PATCH backport 5.10 26/63] UBUNTU: SAUCE: Add support to pwr-mlxbf.c driver BugLink: https://launchpad.net/bugs/1980768 Signed-off-by: Asmaa Mnebhi Signed-off-by: Ike Panhc 1 Signed-off-by: Ike Panhc --- drivers/power/reset/Kconfig | 6 ++ drivers/power/reset/Makefile | 1 + drivers/power/reset/pwr-mlxbf.c | 103 ++++++++++++++++++++++++++++++++ 3 files changed, 110 insertions(+) create mode 100644 drivers/power/reset/pwr-mlxbf.c diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig index d55b3727e..41ee02f87 100644 --- a/drivers/power/reset/Kconfig +++ b/drivers/power/reset/Kconfig @@ -284,5 +284,11 @@ 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 c51eceba9..51801a5b5 100644 --- a/drivers/power/reset/Makefile +++ b/drivers/power/reset/Makefile @@ -33,3 +33,4 @@ 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 000000000..3f587a372 --- /dev/null +++ b/drivers/power/reset/pwr-mlxbf.c @@ -0,0 +1,103 @@ +// SPDX-License-Identifier: GPL-2.0-only or BSD-3-Clause + +/* + * Copyright (c) 2022 NVIDIA CORPORATION & AFFILIATES. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#define DRV_VERSION "1.1" + +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) +{ + const char *rst_pwr_hid = "MLNXBF24"; + const char *low_pwr_hid = "MLNXBF29"; + 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 "); +MODULE_LICENSE("Dual BSD/GPL"); +MODULE_VERSION(DRV_VERSION); -- 2.20.1