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 int 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 	return 0;
45 }
46 EXPORT_SYMBOL_GPL(simatic_ipc_leds_gpio_remove);
47 
48 int simatic_ipc_leds_gpio_probe(struct platform_device *pdev,
49 				struct gpiod_lookup_table *table,
50 				struct gpiod_lookup_table *table_extra)
51 {
52 	const struct simatic_ipc_platform *plat = pdev->dev.platform_data;
53 	struct device *dev = &pdev->dev;
54 	struct gpio_desc *gpiod;
55 	int err;
56 
57 	switch (plat->devmode) {
58 	case SIMATIC_IPC_DEVICE_127E:
59 	case SIMATIC_IPC_DEVICE_227G:
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 	table_extra->dev_id = dev_name(dev);
76 	gpiod_add_lookup_table(table_extra);
77 
78 	/* PM_BIOS_BOOT_N */
79 	gpiod = gpiod_get_index(dev, NULL, 6, GPIOD_OUT_LOW);
80 	if (IS_ERR(gpiod)) {
81 		err = PTR_ERR(gpiod);
82 		goto out;
83 	}
84 	gpiod_put(gpiod);
85 
86 	/* PM_WDT_OUT */
87 	gpiod = gpiod_get_index(dev, NULL, 7, GPIOD_OUT_LOW);
88 	if (IS_ERR(gpiod)) {
89 		err = PTR_ERR(gpiod);
90 		goto out;
91 	}
92 	gpiod_put(gpiod);
93 
94 	return 0;
95 out:
96 	simatic_ipc_leds_gpio_remove(pdev, table, table_extra);
97 
98 	return err;
99 }
100 EXPORT_SYMBOL_GPL(simatic_ipc_leds_gpio_probe);
101 
102 MODULE_LICENSE("GPL v2");
103 MODULE_SOFTDEP("pre: platform:leds-gpio");
104 MODULE_AUTHOR("Henning Schild <henning.schild@siemens.com>");
105