[2/4] leds: simatic-ipc-leds: add new driver for Siemens Industial PCs

Message ID	20210302163309.25528-3-henning.schild@siemens.com (mailing list archive)
State	Superseded
Headers	show Return-Path: <linux-watchdog-owner@kernel.org> From: Henning Schild <henning.schild@siemens.com> To: linux-kernel@vger.kernel.org, linux-leds@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-watchdog@vger.kernel.org Cc: Srikanth Krishnakar <skrishnakar@gmail.com>, Jan Kiszka <jan.kiszka@siemens.com>, Henning Schild <henning.schild@siemens.com>, Gerd Haeussler <gerd.haeussler.ext@siemens.com>, Guenter Roeck <linux@roeck-us.net>, Wim Van Sebroeck <wim@linux-watchdog.org>, Mark Gross <mgross@linux.intel.com>, Hans de Goede <hdegoede@redhat.com>, Pavel Machek <pavel@ucw.cz> Subject: [PATCH 2/4] leds: simatic-ipc-leds: add new driver for Siemens Industial PCs Date: Tue, 2 Mar 2021 17:33:07 +0100 Message-Id: <20210302163309.25528-3-henning.schild@siemens.com> In-Reply-To: <20210302163309.25528-1-henning.schild@siemens.com> References: <20210302163309.25528-1-henning.schild@siemens.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk
Series	add device drivers for Siemens Industrial PCs \| expand [0/4] add device drivers for Siemens Industrial PCs [1/4] platform/x86: simatic-ipc: add main driver for Siemens devices [2/4] leds: simatic-ipc-leds: add new driver for Siemens Industial PCs [3/4] watchdog: simatic-ipc-wdt: add new driver for Siemens Industrial PCs [4/4] platform/x86: pmc_atom: improve critclk_systems matching for Siemens PCs

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index b6742b4231bf..3ee6fc613a0a 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -928,6 +928,17 @@ config LEDS_ACER_A500 This option enables support for the Power Button LED of Acer Iconia Tab A500. +config LEDS_SIEMENS_SIMATIC_IPC + tristate "LED driver for Siemens Simatic IPCs" + depends on LEDS_CLASS + depends on SIEMENS_SIMATIC_IPC + help + This option enables support for the LEDs of several Industrial PCs + from Siemens. + + To compile this driver as a module, choose M here: the module + will be called simatic-ipc-leds. + comment "Flash and Torch LED drivers" source "drivers/leds/flash/Kconfig" diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index 2a698df9da57..c15e1e3c5958 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -93,6 +93,7 @@ obj-$(CONFIG_LEDS_TURRIS_OMNIA) += leds-turris-omnia.o obj-$(CONFIG_LEDS_WM831X_STATUS) += leds-wm831x-status.o obj-$(CONFIG_LEDS_WM8350) += leds-wm8350.o obj-$(CONFIG_LEDS_WRAP) += leds-wrap.o +obj-$(CONFIG_LEDS_SIEMENS_SIMATIC_IPC) += simatic-ipc-leds.o # LED SPI Drivers obj-$(CONFIG_LEDS_CR0014114) += leds-cr0014114.o diff --git a/drivers/leds/simatic-ipc-leds.c b/drivers/leds/simatic-ipc-leds.c new file mode 100644 index 000000000000..760aef1d4ae1 --- /dev/null +++ b/drivers/leds/simatic-ipc-leds.c @@ -0,0 +1,224 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Siemens SIMATIC IPC driver for LEDs + * + * Copyright (c) Siemens AG, 2018-2021 + * + * Authors: + * Henning Schild <henning.schild@siemens.com> + * Jan Kiszka <jan.kiszka@siemens.com> + * Gerd Haeussler <gerd.haeussler.ext@siemens.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/ioport.h> +#include <linux/sizes.h> +#include <linux/leds.h> +#include <linux/platform_device.h> +#include <linux/spinlock.h> +#include <linux/platform_data/x86/simatic-ipc-base.h> + +#define SIMATIC_IPC_LED_PORT_BASE 0x404E + +struct simatic_ipc_led { + unsigned int value; /* mask for io and offset for mem */ + char name[32]; + struct led_classdev cdev; +}; + +static struct simatic_ipc_led simatic_ipc_leds_io[] = { + {1 << 15, "simatic-ipc:green:run-stop"}, + {1 << 7, "simatic-ipc:yellow:run-stop"}, + {1 << 14, "simatic-ipc:red:error"}, + {1 << 6, "simatic-ipc:yellow:error"}, + {1 << 13, "simatic-ipc:red:maint"}, + {1 << 5, "simatic-ipc:yellow:maint"}, + {0, ""}, +}; + +/* the actual start will be discovered with pci, 0 is a placeholder */ +struct resource simatic_ipc_led_mem_res = + DEFINE_RES_MEM_NAMED(0, SZ_4K, KBUILD_MODNAME); + +static void *simatic_ipc_led_memory; + +static struct simatic_ipc_led simatic_ipc_leds_mem[] = { + {0x500 + 0x1A0, "simatic-ipc:red:run-stop"}, + {0x500 + 0x1A8, "simatic-ipc:green:run-stop"}, + {0x500 + 0x1C8, "simatic-ipc:red:error"}, + {0x500 + 0x1D0, "simatic-ipc:green:error"}, + {0x500 + 0x1E0, "simatic-ipc:red:maint"}, + {0x500 + 0x198, "simatic-ipc:green:maint"}, + {0, ""}, +}; + +static struct resource simatic_ipc_led_io_res = + DEFINE_RES_IO_NAMED(SIMATIC_IPC_LED_PORT_BASE, SZ_1, KBUILD_MODNAME); + +static DEFINE_SPINLOCK(reg_lock); + +static void simatic_ipc_led_set_io(struct led_classdev *led_cd, + enum led_brightness brightness) +{ + struct simatic_ipc_led *led = + container_of(led_cd, struct simatic_ipc_led, cdev); + unsigned long flags; + unsigned int val; + + spin_lock_irqsave(&reg_lock, flags); + + val = inw(SIMATIC_IPC_LED_PORT_BASE); + if (brightness == LED_OFF) + outw(val | led->value, SIMATIC_IPC_LED_PORT_BASE); + else + outw(val & ~led->value, SIMATIC_IPC_LED_PORT_BASE); + + spin_unlock_irqrestore(&reg_lock, flags); +} + +static enum led_brightness simatic_ipc_led_get_io(struct led_classdev *led_cd) +{ + struct simatic_ipc_led *led = + container_of(led_cd, struct simatic_ipc_led, cdev); + + return inw(SIMATIC_IPC_LED_PORT_BASE) & led->value ? + LED_OFF : led_cd->max_brightness; +} + +static void simatic_ipc_led_set_mem(struct led_classdev *led_cd, + enum led_brightness brightness) +{ + struct simatic_ipc_led *led = + container_of(led_cd, struct simatic_ipc_led, cdev); + + u32 *p; + + p = simatic_ipc_led_memory + led->value; + *p = (*p & ~1) | (brightness == LED_OFF); +} + +static enum led_brightness simatic_ipc_led_get_mem(struct led_classdev *led_cd) +{ + struct simatic_ipc_led *led = + container_of(led_cd, struct simatic_ipc_led, cdev); + + u32 *p; + + p = simatic_ipc_led_memory + led->value; + return (*p & 1) ? LED_OFF : led_cd->max_brightness; +} + +static int simatic_ipc_leds_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct led_classdev *cdev; + struct resource *res; + int err, type; + struct simatic_ipc_led *ipcled; + struct simatic_ipc_platform *plat; + u32 *p; + + plat = pdev->dev.platform_data; + + switch (plat->devmode) { + case SIMATIC_IPC_DEVICE_227D: + case SIMATIC_IPC_DEVICE_427E: + res = &simatic_ipc_led_io_res; + ipcled = simatic_ipc_leds_io; + /* the 227D is high on while 427E is low on, invert the struct + * we have + */ + if (plat->devmode == SIMATIC_IPC_DEVICE_227D) { + while (ipcled->value) { + ipcled->value = swab16(ipcled->value); + ipcled++; + } + ipcled = simatic_ipc_leds_io; + } + type = IORESOURCE_IO; + if (!devm_request_region(dev, res->start, + resource_size(res), + KBUILD_MODNAME)) { + dev_err(dev, + "Unable to register IO resource at %pR\n", + res); + return -EBUSY; + } + break; + case SIMATIC_IPC_DEVICE_127E: + res = &simatic_ipc_led_mem_res; + ipcled = simatic_ipc_leds_mem; + type = IORESOURCE_MEM; + + /* get GPIO base from PCI */ + res->start = simatic_ipc_get_membase0(PCI_DEVFN(13, 0)); + if (res->start == 0) + return -ENODEV; + + /* do the final address calculation */ + res->start = res->start + (0xC5 << 16); + res->end += res->start; + + simatic_ipc_led_memory = devm_ioremap_resource(dev, res); + if (!simatic_ipc_led_memory) + return -ENOMEM; + + /* initialize power/watchdog LED */ + p = simatic_ipc_led_memory + 0x500 + 0x1D8; // PM_WDT_OUT + *p = (*p & ~1); + p = simatic_ipc_led_memory + 0x500 + 0x1C0; // PM_BIOS_BOOT_N + *p = (*p | 1); + + break; + default: + return -ENODEV; + } + + while (ipcled->value) { + cdev = &ipcled->cdev; + cdev->brightness_set = simatic_ipc_led_set_io; + cdev->brightness_get = simatic_ipc_led_get_io; + if (type == IORESOURCE_MEM) { + cdev->brightness_set = simatic_ipc_led_set_mem; + cdev->brightness_get = simatic_ipc_led_get_mem; + } + cdev->max_brightness = LED_ON; + cdev->name = ipcled->name; + + err = devm_led_classdev_register(dev, cdev); + if (err < 0) + return err; + ipcled++; + } + + return 0; +} + +static struct platform_driver led_driver = { + .probe = simatic_ipc_leds_probe, + .driver = { + .name = KBUILD_MODNAME, + }, +}; + +static int __init simatic_ipc_led_init_module(void) +{ + return platform_driver_register(&led_driver); +} + +static void simatic_ipc_led_exit_module(void) +{ + platform_driver_unregister(&led_driver); +} + +module_init(simatic_ipc_led_init_module); +module_exit(simatic_ipc_led_exit_module); + +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:" KBUILD_MODNAME); +MODULE_AUTHOR("Henning Schild <henning.schild@siemens.com>");

[2/4] leds: simatic-ipc-leds: add new driver for Siemens Industial PCs

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