[PATCH v3 4/4] leds: simatic-ipc-leds-gpio: add GPIO version of Siemens driver

Henning Schild
2022-05-13T08:37:35Z

On Apollo Lake the pinctrl drivers will now come up without ACPI. Use
that instead of open coding it.
Create a new driver for that which can later be filled with more GPIO
based models, and which has different dependencies.

Signed-off-by: Henning Schild <henning.schild@siemens.com>
---
drivers/leds/simple/Kconfig | 7 +-
drivers/leds/simple/Makefile | 1 +
drivers/leds/simple/simatic-ipc-leds-gpio.c | 105 ++++++++++++++++++++
drivers/leds/simple/simatic-ipc-leds.c | 80 +--------------
drivers/platform/x86/simatic-ipc.c | 5 +-
5 files changed, 117 insertions(+), 81 deletions(-)
create mode 100644 drivers/leds/simple/simatic-ipc-leds-gpio.c

diff --git a/drivers/leds/simple/Kconfig b/drivers/leds/simple/Kconfig
index bbf8cff3c3f6..fd2b8225d926 100644
--- a/drivers/leds/simple/Kconfig
+++ b/drivers/leds/simple/Kconfig
@@ -1,12 +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 LEDS_GPIO
depends on SIEMENS_SIMATIC_IPC
- select P2SB
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.
+ To compile this driver as a module, choose M here: the modules
+ will be called simatic-ipc-leds and simatic-ipc-leds-gpio.
diff --git a/drivers/leds/simple/Makefile b/drivers/leds/simple/Makefile
index 8481f1e9e360..1c7ef5e1324b 100644
--- a/drivers/leds/simple/Makefile
+++ b/drivers/leds/simple/Makefile
@@ -1,2 +1,3 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_LEDS_SIEMENS_SIMATIC_IPC) += simatic-ipc-leds.o
+obj-$(CONFIG_LEDS_SIEMENS_SIMATIC_IPC) += simatic-ipc-leds-gpio.o
diff --git a/drivers/leds/simple/simatic-ipc-leds-gpio.c b/drivers/leds/simple/simatic-ipc-leds-gpio.c
new file mode 100644
index 000000000000..4c9e663a90ba
--- /dev/null
+++ b/drivers/leds/simple/simatic-ipc-leds-gpio.c
@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Siemens SIMATIC IPC driver for GPIO based LEDs
+ *
+ * Copyright (c) Siemens AG, 2022
+ *
+ * Authors:
+ * Henning Schild <henning.schild@siemens.com>
+ */
+
+#include <linux/gpio/machine.h>
+#include <linux/gpio/consumer.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+static struct gpiod_lookup_table simatic_ipc_led_gpio_table = {
+ .dev_id = "leds-gpio",
+ .table = {
+ GPIO_LOOKUP_IDX("apollolake-pinctrl.0", 51, NULL, 0, GPIO_ACTIVE_LOW),
+ GPIO_LOOKUP_IDX("apollolake-pinctrl.0", 52, NULL, 1, GPIO_ACTIVE_LOW),
+ GPIO_LOOKUP_IDX("apollolake-pinctrl.0", 53, NULL, 2, GPIO_ACTIVE_LOW),
+ GPIO_LOOKUP_IDX("apollolake-pinctrl.0", 57, NULL, 3, GPIO_ACTIVE_LOW),
+ GPIO_LOOKUP_IDX("apollolake-pinctrl.0", 58, NULL, 4, GPIO_ACTIVE_LOW),
+ GPIO_LOOKUP_IDX("apollolake-pinctrl.0", 60, NULL, 5, GPIO_ACTIVE_LOW),
+ GPIO_LOOKUP_IDX("apollolake-pinctrl.0", 56, NULL, 6, GPIO_ACTIVE_LOW),
+ GPIO_LOOKUP_IDX("apollolake-pinctrl.0", 59, NULL, 7, GPIO_ACTIVE_HIGH),
+ },
+};
+
+static const struct gpio_led simatic_ipc_gpio_leds[] = {
+ { .name = "green:" LED_FUNCTION_STATUS "-3" },
+ { .name = "red:" LED_FUNCTION_STATUS "-1" },
+ { .name = "green:" LED_FUNCTION_STATUS "-1" },
+ { .name = "red:" LED_FUNCTION_STATUS "-2" },
+ { .name = "green:" LED_FUNCTION_STATUS "-2" },
+ { .name = "red:" LED_FUNCTION_STATUS "-3" },
+};
+
+static const struct gpio_led_platform_data simatic_ipc_gpio_leds_pdata = {
+ .num_leds = ARRAY_SIZE(simatic_ipc_gpio_leds),
+ .leds = simatic_ipc_gpio_leds,
+};
+
+static struct platform_device *simatic_leds_pdev;
+
+static int simatic_ipc_leds_gpio_remove(struct platform_device *pdev)
+{
+ gpiod_remove_lookup_table(&simatic_ipc_led_gpio_table);
+ platform_device_unregister(simatic_leds_pdev);
+
+ return 0;
+}
+
+static int simatic_ipc_leds_gpio_probe(struct platform_device *pdev)
+{
+ struct gpio_desc *gpiod;
+ int err;
+
+ gpiod_add_lookup_table(&simatic_ipc_led_gpio_table);
+ simatic_leds_pdev = platform_device_register_resndata(NULL,
+ "leds-gpio", PLATFORM_DEVID_NONE, NULL, 0,
+ &simatic_ipc_gpio_leds_pdata,
+ sizeof(simatic_ipc_gpio_leds_pdata));
+ if (IS_ERR(simatic_leds_pdev)) {
+ err = PTR_ERR(simatic_leds_pdev);
+ goto out;
+ }
+
+ /* PM_BIOS_BOOT_N */
+ gpiod = gpiod_get_index(&simatic_leds_pdev->dev, NULL, 6, GPIOD_OUT_LOW);
+ if (IS_ERR(gpiod)) {
+ err = PTR_ERR(gpiod);
+ goto out;
+ }
+ gpiod_put(gpiod);
+
+ /* PM_WDT_OUT */
+ gpiod = gpiod_get_index(&simatic_leds_pdev->dev, NULL, 7, GPIOD_OUT_LOW);
+ if (IS_ERR(gpiod)) {
+ err = PTR_ERR(gpiod);
+ goto out;
+ }
+ gpiod_put(gpiod);
+
+ return 0;
+out:
+ simatic_ipc_leds_gpio_remove(pdev);
+
+ return err;
+}
+
+static struct platform_driver simatic_ipc_led_gpio_driver = {
+ .probe = simatic_ipc_leds_gpio_probe,
+ .remove = simatic_ipc_leds_gpio_remove,
+ .driver = {
+ .name = KBUILD_MODNAME,
+ }
+};
+module_platform_driver(simatic_ipc_led_gpio_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" KBUILD_MODNAME);
+MODULE_SOFTDEP("pre: platform:leds-gpio");
+MODULE_AUTHOR("Henning Schild <henning.schild@siemens.com>");
diff --git a/drivers/leds/simple/simatic-ipc-leds.c b/drivers/leds/simple/simatic-ipc-leds.c
index 2e7597c143d8..4894c228c165 100644
--- a/drivers/leds/simple/simatic-ipc-leds.c
+++ b/drivers/leds/simple/simatic-ipc-leds.c
@@ -15,7 +15,6 @@
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/pci.h>
-#include <linux/platform_data/x86/p2sb.h>
#include <linux/platform_data/x86/simatic-ipc-base.h>
#include <linux/platform_device.h>
#include <linux/sizes.h>
@@ -24,7 +23,7 @@
#define SIMATIC_IPC_LED_PORT_BASE 0x404E

struct simatic_ipc_led {
- unsigned int value; /* mask for io and offset for mem */
+ unsigned int value; /* mask for io */
char *name;
struct led_classdev cdev;
};
@@ -39,21 +38,6 @@ static struct simatic_ipc_led simatic_ipc_leds_io[] = {
{ }
};

-/* the actual start will be discovered with p2sb, 0 is a placeholder */
-static struct resource simatic_ipc_led_mem_res = DEFINE_RES_MEM_NAMED(0, 0, KBUILD_MODNAME);
-
-static void __iomem *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);

@@ -89,28 +73,6 @@ static enum led_brightness simatic_ipc_led_get_io(struct led_classdev *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);
- void __iomem *reg = simatic_ipc_led_memory + led->value;
- u32 val;
-
- val = readl(reg);
- val = (val & ~1) | (brightness == LED_OFF);
- writel(val, reg);
-}
-
-static enum led_brightness simatic_ipc_led_get_mem(struct led_classdev *led_cd)
-{
- struct simatic_ipc_led *led = cdev_to_led(led_cd);
- void __iomem *reg = simatic_ipc_led_memory + led->value;
- u32 val;
-
- val = readl(reg);
- return (val & 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;
@@ -118,9 +80,7 @@ static int simatic_ipc_leds_probe(struct platform_device *pdev)
struct simatic_ipc_led *ipcled;
struct led_classdev *cdev;
struct resource *res;
- void __iomem *reg;
- int err, type;
- u32 val;
+ int err;

switch (plat->devmode) {
case SIMATIC_IPC_DEVICE_227D:
@@ -135,51 +95,19 @@ static int simatic_ipc_leds_probe(struct platform_device *pdev)
}
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;
-
- err = p2sb_bar(NULL, 0, res);
- if (err)
- return err;
-
- /* do the final address calculation */
- res->start = res->start + (0xC5 << 16);
- res->end = res->start + SZ_4K - 1;
-
- 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 */
- reg = simatic_ipc_led_memory + 0x500 + 0x1D8; /* PM_WDT_OUT */
- val = readl(reg);
- writel(val & ~1, reg);
-
- reg = simatic_ipc_led_memory + 0x500 + 0x1C0; /* PM_BIOS_BOOT_N */
- val = readl(reg);
- writel(val | 1, reg);
- 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->brightness_set = simatic_ipc_led_set_io;
+ cdev->brightness_get = simatic_ipc_led_get_io;
cdev->max_brightness = LED_ON;
cdev->name = ipcled->name;

diff --git a/drivers/platform/x86/simatic-ipc.c b/drivers/platform/x86/simatic-ipc.c
index 26c35e1660cb..ca3647b751d5 100644
--- a/drivers/platform/x86/simatic-ipc.c
+++ b/drivers/platform/x86/simatic-ipc.c
@@ -51,6 +51,7 @@ static int register_platform_devices(u32 station_id)
{
u8 ledmode = SIMATIC_IPC_DEVICE_NONE;
u8 wdtmode = SIMATIC_IPC_DEVICE_NONE;
+ char *pdevname = KBUILD_MODNAME "_leds";
int i;

platform_data.devmode = SIMATIC_IPC_DEVICE_NONE;
@@ -64,10 +65,12 @@ static int register_platform_devices(u32 station_id)
}

if (ledmode != SIMATIC_IPC_DEVICE_NONE) {
+ if (ledmode == SIMATIC_IPC_DEVICE_127E)
+ pdevname = KBUILD_MODNAME "_leds_gpio";
platform_data.devmode = ledmode;
ipc_led_platform_device =
platform_device_register_data(NULL,
- KBUILD_MODNAME "_leds", PLATFORM_DEVID_NONE,
+ pdevname, PLATFORM_DEVID_NONE,
&platform_data,
sizeof(struct simatic_ipc_platform));
if (IS_ERR(ipc_led_platform_device))
--
2.35.1