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SubjectRe: [PATCH v6 12/12] leds: simatic-ipc-leds-gpio: add GPIO version of Siemens driver
Am Mon,  6 Jun 2022 19:41:38 +0300
schrieb Andy Shevchenko <andriy.shevchenko@linux.intel.com>:

> From: Henning Schild <henning.schild@siemens.com>
>
> 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>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.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 those GPIOs can not be found that leads to a pretty severe
logging/polling endless loop.

...
[ 34.017017] leds-gpio leds-gpio: Skipping unavailable LED gpio 0 (red:status-2)
[ 34.017038] leds-gpio leds-gpio: cannot find GPIO chip apollolake-pinctrl.0, deferring
[ 34.017158] leds-gpio leds-gpio: Skipping unavailable LED gpio 0 (red:status-2)
[ 34.017161] leds-gpio leds-gpio: cannot find GPIO chip apollolake-pinctrl.0, deferring
[ 34.017163] leds-gpio leds-gpio: Skipping unavailable LED gpio 0 (green:status-2)
[ 34.017166] leds-gpio leds-gpio: cannot find GPIO chip apollolake-pinctrl.0, deferring
[ 34.017168] leds-gpio leds-gpio: Skipping unavailable LED gpio 0 (red:status-3)
[ 34.017179] leds-gpio leds-gpio: cannot find GPIO chip apollolake-pinctrl.0, deferring
[ 34.017275] leds-gpio leds-gpio: cannot find GPIO chip apollolake-pinctrl.0, deferring
[ 34.017279] leds-gpio leds-gpio: Skipping unavailable LED gpio 0 (green:status-3)
...

This can be seen when the kernel is build without
CONFIG_PINCTRL_BROXTON. Can anyone please give advise on how to proceed
here.

I could do something like i proposed in "[PATCH 3/4] leds:
simatic-ipc-leds-gpio: add new model 227G".

if (!IS_ENABLED(CONFIG_PINCTRL_BROXTON)) return -ENO...

before registering the platform device.

An alternative could be to try and handle that -EPROBE_DEFER but that
might be hard because it might well fail a couple of times before
eventually that gpio driver is up, so i think i will send an update
implementing that !IS_ENABLED.

Ideally the gpio subsystem or leds-gpio would break that
polling/printing loop for me, or make sure it would not happen in the
first place.

regards,
Henning

> + 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))

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