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

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Siemens SIMATIC IPC driver for GPIO based LEDs
   4  *
   5  * Copyright (c) Siemens AG, 2023
   6  *
   7  * Author:
   8  *  Henning Schild <henning.schild@siemens.com>
   9  */
  10
  11 #include <linux/gpio/machine.h>
  12 #include <linux/gpio/consumer.h>
  13 #include <linux/leds.h>
  14 #include <linux/module.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/platform_data/x86/simatic-ipc-base.h>
  17
  18 #include "simatic-ipc-leds-gpio.h"
  19
  20 static struct platform_device *simatic_leds_pdev;
  21
  22 static const struct gpio_led simatic_ipc_gpio_leds[] = {
  23         { .name = "red:" LED_FUNCTION_STATUS "-1" },
  24         { .name = "green:" LED_FUNCTION_STATUS "-1" },
  25         { .name = "red:" LED_FUNCTION_STATUS "-2" },
  26         { .name = "green:" LED_FUNCTION_STATUS "-2" },
  27         { .name = "red:" LED_FUNCTION_STATUS "-3" },
  28         { .name = "green:" LED_FUNCTION_STATUS "-3" },
  29 };
  30
  31 static const struct gpio_led_platform_data simatic_ipc_gpio_leds_pdata = {
  32         .num_leds       = ARRAY_SIZE(simatic_ipc_gpio_leds),
  33         .leds           = simatic_ipc_gpio_leds,
  34 };
  35
  36 void simatic_ipc_leds_gpio_remove(struct platform_device *pdev,
  37                                  struct gpiod_lookup_table *table,
  38                                  struct gpiod_lookup_table *table_extra)
  39 {
  40         gpiod_remove_lookup_table(table);
  41         gpiod_remove_lookup_table(table_extra);
  42         platform_device_unregister(simatic_leds_pdev);
  43 }
  44 EXPORT_SYMBOL_GPL(simatic_ipc_leds_gpio_remove);
  45
  46 int simatic_ipc_leds_gpio_probe(struct platform_device *pdev,
  47                                 struct gpiod_lookup_table *table,
  48                                 struct gpiod_lookup_table *table_extra)
  49 {
  50         const struct simatic_ipc_platform *plat = pdev->dev.platform_data;
  51         struct device *dev = &pdev->dev;
  52         struct gpio_desc *gpiod;
  53         int err;
  54
  55         switch (plat->devmode) {
  56         case SIMATIC_IPC_DEVICE_127E:
  57         case SIMATIC_IPC_DEVICE_227G:
  58         case SIMATIC_IPC_DEVICE_BX_21A:
  59         case SIMATIC_IPC_DEVICE_BX_59A:
  60                 break;
  61         default:
  62                 return -ENODEV;
  63         }
  64
  65         gpiod_add_lookup_table(table);
  66         simatic_leds_pdev = platform_device_register_resndata(NULL,
  67                 "leds-gpio", PLATFORM_DEVID_NONE, NULL, 0,
  68                 &simatic_ipc_gpio_leds_pdata,
  69                 sizeof(simatic_ipc_gpio_leds_pdata));
  70         if (IS_ERR(simatic_leds_pdev)) {
  71                 err = PTR_ERR(simatic_leds_pdev);
  72                 goto out;
  73         }
  74
  75         if (!table_extra)
  76                 return 0;
  77
  78         table_extra->dev_id = dev_name(dev);
  79         gpiod_add_lookup_table(table_extra);
  80
  81         /* PM_BIOS_BOOT_N */
  82         gpiod = gpiod_get_index(dev, NULL, 6, GPIOD_OUT_LOW);
  83         if (IS_ERR(gpiod)) {
  84                 err = PTR_ERR(gpiod);
  85                 goto out;
  86         }
  87         gpiod_put(gpiod);
  88
  89         /* PM_WDT_OUT */
  90         gpiod = gpiod_get_index(dev, NULL, 7, GPIOD_OUT_LOW);
  91         if (IS_ERR(gpiod)) {
  92                 err = PTR_ERR(gpiod);
  93                 goto out;
  94         }
  95         gpiod_put(gpiod);
  96
  97         return 0;
  98 out:
  99         simatic_ipc_leds_gpio_remove(pdev, table, table_extra);
 100
 101         return err;
 102 }
 103 EXPORT_SYMBOL_GPL(simatic_ipc_leds_gpio_probe);
 104
 105 MODULE_DESCRIPTION("Siemens SIMATIC IPC core driver for GPIO based LEDs");
 106 MODULE_LICENSE("GPL v2");
 107 MODULE_SOFTDEP("pre: platform:leds-gpio");
 108 MODULE_AUTHOR("Henning Schild <henning.schild@siemens.com>");