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    Subject[PATCH 2/4] leds: simatic-ipc-leds: add new driver for Siemens Industial PCs
    Date
    From: Henning Schild <henning.schild@siemens.com>

    This driver adds initial support for several devices from Siemens. It is
    based on a platform driver introduced in an earlier commit.

    Signed-off-by: Gerd Haeussler <gerd.haeussler.ext@siemens.com>
    Signed-off-by: Henning Schild <henning.schild@siemens.com>
    ---
    drivers/leds/Kconfig | 11 ++
    drivers/leds/Makefile | 1 +
    drivers/leds/simatic-ipc-leds.c | 224 ++++++++++++++++++++++++++++++++
    3 files changed, 236 insertions(+)
    create mode 100644 drivers/leds/simatic-ipc-leds.c

    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>");
    --
    2.26.2
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