Commit 8c78e061 authored by Henning Schild's avatar Henning Schild Committed by Hans de Goede
Browse files

leds: simatic-ipc-leds: add new driver for Siemens Industial PCs 



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

One of the supported machines has GPIO connected LEDs, here we poke GPIO
memory directly because pinctrl does not come up.

Signed-off-by: default avatarHenning Schild <henning.schild@siemens.com>
Acked-by: default avatarPavel Machek <pavel@ucw.cz>
Link: https://lore.kernel.org/r/20211213120502.20661-3-henning.schild@siemens.com


Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
parent dd123e62

drivers/leds/Kconfig

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@@ -879,4 +879,7 @@ source "drivers/leds/flash/Kconfig" 
comment "LED Triggers"

source "drivers/leds/trigger/Kconfig"



comment "Simple LED drivers"

source "drivers/leds/simple/Kconfig"



endif # NEW_LEDS

drivers/leds/Makefile

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@@ -105,3 +105,6 @@ obj-$(CONFIG_LEDS_TRIGGERS) += trigger/ 


# LED Blink

obj-y					+= blink/



# Simple LED drivers

obj-y					+= simple/

drivers/leds/simple/Kconfig

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# SPDX-License-Identifier: GPL-2.0-only

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.

drivers/leds/simple/Makefile

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# SPDX-License-Identifier: GPL-2.0

obj-$(CONFIG_LEDS_SIEMENS_SIMATIC_IPC)	+= simatic-ipc-leds.o

drivers/leds/simple/simatic-ipc-leds.c

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// 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>

 */



#include <linux/ioport.h>

#include <linux/kernel.h>

#include <linux/leds.h>

#include <linux/module.h>

#include <linux/pci.h>

#include <linux/platform_data/x86/simatic-ipc-base.h>

#include <linux/platform_device.h>

#include <linux/sizes.h>

#include <linux/spinlock.h>



#define SIMATIC_IPC_LED_PORT_BASE	0x404E



struct simatic_ipc_led {

	unsigned int value; /* mask for io and offset for mem */

	char *name;

	struct led_classdev cdev;

};



static struct simatic_ipc_led simatic_ipc_leds_io[] = {

	{1 << 15, "green:" LED_FUNCTION_STATUS "-1" },

	{1 << 7,  "yellow:" LED_FUNCTION_STATUS "-1" },

	{1 << 14, "red:" LED_FUNCTION_STATUS "-2" },

	{1 << 6,  "yellow:" LED_FUNCTION_STATUS "-2" },

	{1 << 13, "red:" LED_FUNCTION_STATUS "-3" },

	{1 << 5,  "yellow:" LED_FUNCTION_STATUS "-3" },

	{ }

};



/* 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, "red:" LED_FUNCTION_STATUS "-1"},

	{0x500 + 0x1A8, "green:" LED_FUNCTION_STATUS "-1"},

	{0x500 + 0x1C8, "red:" LED_FUNCTION_STATUS "-2"},

	{0x500 + 0x1D0, "green:" LED_FUNCTION_STATUS "-2"},

	{0x500 + 0x1E0, "red:" LED_FUNCTION_STATUS "-3"},

	{0x500 + 0x198, "green:" LED_FUNCTION_STATUS "-3"},

	{ }

};



static struct resource simatic_ipc_led_io_res =

	DEFINE_RES_IO_NAMED(SIMATIC_IPC_LED_PORT_BASE, SZ_2, KBUILD_MODNAME);



static DEFINE_SPINLOCK(reg_lock);



static inline struct simatic_ipc_led *cdev_to_led(struct led_classdev *led_cd)

{

	return container_of(led_cd, struct simatic_ipc_led, cdev);

}



static void simatic_ipc_led_set_io(struct led_classdev *led_cd,

				   enum led_brightness brightness)

{

	struct simatic_ipc_led *led = cdev_to_led(led_cd);

	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 = cdev_to_led(led_cd);



	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 = cdev_to_led(led_cd);



	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 = cdev_to_led(led_cd);



	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)

{

	const struct simatic_ipc_platform *plat = pdev->dev.platform_data;

	struct device *dev = &pdev->dev;

	struct simatic_ipc_led *ipcled;

	struct led_classdev *cdev;

	struct resource *res;

	int err, type;

	u32 *p;



	switch (plat->devmode) {

	case SIMATIC_IPC_DEVICE_227D:

	case SIMATIC_IPC_DEVICE_427E:

		res = &simatic_ipc_led_io_res;

		ipcled = simatic_ipc_leds_io;

		/* on 227D the two bytes work the other way araound */

		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 (IS_ERR(simatic_ipc_led_memory))

			return PTR_ERR(simatic_ipc_led_memory);



		/* 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;

		if (type == IORESOURCE_MEM) {

			cdev->brightness_set = simatic_ipc_led_set_mem;

			cdev->brightness_get = simatic_ipc_led_get_mem;

		} else {

			cdev->brightness_set = simatic_ipc_led_set_io;

			cdev->brightness_get = simatic_ipc_led_get_io;

		}

		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 simatic_ipc_led_driver = {

	.probe = simatic_ipc_leds_probe,

	.driver = {

		.name = KBUILD_MODNAME,

	}

};



module_platform_driver(simatic_ipc_led_driver);



MODULE_LICENSE("GPL v2");

MODULE_ALIAS("platform:" KBUILD_MODNAME);

MODULE_AUTHOR("Henning Schild <henning.schild@siemens.com>");