In this patchset support of Native PCIe Enclosure Management is proposed. Stuart Hayes was working on this earlier. It is a new serie because it is NPEM only. NPEM is pattern oriented standard, it tells which "pattern" should blink. It doesn't control physical LED or pattern visualization. It is described better in second patch. Overall, driver is simple but it was not simple to fit it into interfaces we have in kernel (We considered leds and enclosure interfaces). It reuses leds interface, this approach seems to be the best because: - leds are actively maintained, no new interface added. - leds do not require any extensions, enclosure needs to be adjusted first. There are trade-offs: - "brightness" is the name of sysfs file to control led. It is not natural to use brightness to set patterns, that is why multiple led devices are created (one per pattern); - Update of one led may affect other leds, led triggers may not work as expected. It doesn't provide ACPI _DSM support, it requires separate implementation outside drives/pci/ but NPEM is not registered if _DSM is available. This patchset was made in close collaboration with Lucas Wunner. Cc: Arnd Bergmann <arnd@xxxxxxxx> Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> Cc: Dan Williams <dan.j.williams@xxxxxxxxx> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Cc: Ilpo Jarvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx> Cc: Lukas Wunner <lukas@xxxxxxxxx> Cc: Keith Busch <kbusch@xxxxxxxxxx> Cc: Marek Behun <marek.behun@xxxxxx> Cc: Pavel Machek <pavel@xxxxxx> Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxxx> Cc: Shevchenko, Andriy <andriy.shevchenko@xxxxxxxxx> Cc: Stuart Hayes <stuart.w.hayes@xxxxxxxxx> Link: https://lore.kernel.org/linux-pci/20201106194221.59353-1-stuart.w.hayes@xxxxxxxxx/ Link: https://lore.kernel.org/linux-pci/20201110153735.58587-1-stuart.w.hayes@xxxxxxxxx/ Link: https://lore.kernel.org/linux-pci/20210416192010.3197-1-stuart.w.hayes@xxxxxxxxx/ Link: https://lore.kernel.org/linux-pci/20210601203820.3647-1-stuart.w.hayes@xxxxxxxxx/ Link: https://lore.kernel.org/linux-pci/20210813213653.3760-1-stuart.w.hayes@xxxxxxxxx/ Link: https://lore.kernel.org/linux-pci/cover.1642460765.git.stuart.w.hayes@xxxxxxxxx/ Link: https://lore.kernel.org/linux-pci/cover.1643822289.git.stuart.w.hayes@xxxxxxxxx/ Mariusz Tkaczyk (2): leds: Init leds class earlier PCI/NPEM: Add Native PCIe Enclosure Management support drivers/leds/led-class.c | 2 +- drivers/pci/Kconfig | 7 + drivers/pci/Makefile | 1 + drivers/pci/bus.c | 1 + drivers/pci/npem.c | 339 ++++++++++++++++++++++++++++++++++ drivers/pci/pci.h | 8 + drivers/pci/remove.c | 1 + include/linux/pci.h | 4 + include/uapi/linux/pci_regs.h | 34 ++++ 9 files changed, 396 insertions(+), 1 deletion(-) create mode 100644 drivers/pci/npem.c -- 2.35.3
