[PATCH v2 2/4] leds: simatic-ipc-leds: add new driver for Siemens Industial PCs

Henning Schild
2021-03-15T09:58:30Z

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: Henning Schild <henning.schild@siemens.com>
---
drivers/leds/Kconfig | 3 +
drivers/leds/Makefile | 3 +
drivers/leds/simple/Kconfig | 11 ++
drivers/leds/simple/Makefile | 2 +
drivers/leds/simple/simatic-ipc-leds.c | 210 +++++++++++++++++++++++++
5 files changed, 229 insertions(+)
create mode 100644 drivers/leds/simple/Kconfig
create mode 100644 drivers/leds/simple/Makefile
create mode 100644 drivers/leds/simple/simatic-ipc-leds.c

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index b6742b4231bf..5c8558a4fa60 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -937,4 +937,7 @@ source "drivers/leds/trigger/Kconfig"
comment "LED Blink"
source "drivers/leds/blink/Kconfig"

+comment "Simple LED drivers"
+source "drivers/leds/simple/Kconfig"
+
endif # NEW_LEDS
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 2a698df9da57..2de7fdd8d629 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -111,3 +111,6 @@ obj-$(CONFIG_LEDS_TRIGGERS) += trigger/

# LED Blink
obj-$(CONFIG_LEDS_BLINK) += blink/
+
+# Simple LED drivers
+obj-y += simple/
diff --git a/drivers/leds/simple/Kconfig b/drivers/leds/simple/Kconfig
new file mode 100644
index 000000000000..9f6a68336659
--- /dev/null
+++ b/drivers/leds/simple/Kconfig
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config LEDS_SIEMENS_SIMATIC_IPC
+ tristate "LED driver for Siemens Simatic IPCs"
+ depends on LEDS_CLASS
+ depends on SIEMENS_SIMATIC_IPC
+ help
+ This option enables support for the LEDs of several Industrial PCs
+ from Siemens.
+
+ To compile this driver as a module, choose M here: the module
+ will be called simatic-ipc-leds.
diff --git a/drivers/leds/simple/Makefile b/drivers/leds/simple/Makefile
new file mode 100644
index 000000000000..8481f1e9e360
--- /dev/null
+++ b/drivers/leds/simple/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_LEDS_SIEMENS_SIMATIC_IPC) += simatic-ipc-leds.o
diff --git a/drivers/leds/simple/simatic-ipc-leds.c b/drivers/leds/simple/simatic-ipc-leds.c
new file mode 100644
index 000000000000..0f7e6320e10d
--- /dev/null
+++ b/drivers/leds/simple/simatic-ipc-leds.c
@@ -0,0 +1,210 @@
+// 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[32];
+ struct led_classdev cdev;
+};
+
+static struct simatic_ipc_led simatic_ipc_leds_io[] = {
+ {1 << 15, "simatic-ipc:green:" LED_FUNCTION_STATUS "-1" },
+ {1 << 7, "simatic-ipc:yellow:" LED_FUNCTION_STATUS "-1" },
+ {1 << 14, "simatic-ipc:red:" LED_FUNCTION_STATUS "-2" },
+ {1 << 6, "simatic-ipc:yellow:" LED_FUNCTION_STATUS "-2" },
+ {1 << 13, "simatic-ipc:red:" LED_FUNCTION_STATUS "-3" },
+ {1 << 5, "simatic-ipc:yellow:" LED_FUNCTION_STATUS "-3" },
+ {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:" LED_FUNCTION_STATUS "-1"},
+ {0x500 + 0x1A8, "simatic-ipc:green:" LED_FUNCTION_STATUS "-1"},
+ {0x500 + 0x1C8, "simatic-ipc:red:" LED_FUNCTION_STATUS "-2"},
+ {0x500 + 0x1D0, "simatic-ipc:green:" LED_FUNCTION_STATUS "-2"},
+ {0x500 + 0x1E0, "simatic-ipc:red:" LED_FUNCTION_STATUS "-3"},
+ {0x500 + 0x198, "simatic-ipc:green:" LED_FUNCTION_STATUS "-3"},
+ {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 simatic_ipc_platform *plat;
+ struct device *dev = &pdev->dev;
+ struct simatic_ipc_led *ipcled;
+ struct led_classdev *cdev;
+ struct resource *res;
+ int err, type;
+ 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 (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;
+ 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,
+ },
+};
+
+module_platform_driver(led_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" KBUILD_MODNAME);
+MODULE_AUTHOR("Henning Schild <henning.schild@siemens.com>");
--
2.26.2