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
simatic_ipc_leds_gpio_remove(struct platform_device * pdev,struct gpiod_lookup_table * table,struct gpiod_lookup_table * table_extra)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
simatic_ipc_leds_gpio_probe(struct platform_device * pdev,struct gpiod_lookup_table * table,struct gpiod_lookup_table * table_extra)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 case SIMATIC_IPC_DEVICE_BX_21A:
61 break;
62 default:
63 return -ENODEV;
64 }
65
66 gpiod_add_lookup_table(table);
67 simatic_leds_pdev = platform_device_register_resndata(NULL,
68 "leds-gpio", PLATFORM_DEVID_NONE, NULL, 0,
69 &simatic_ipc_gpio_leds_pdata,
70 sizeof(simatic_ipc_gpio_leds_pdata));
71 if (IS_ERR(simatic_leds_pdev)) {
72 err = PTR_ERR(simatic_leds_pdev);
73 goto out;
74 }
75
76 if (!table_extra)
77 return 0;
78
79 table_extra->dev_id = dev_name(dev);
80 gpiod_add_lookup_table(table_extra);
81
82 /* PM_BIOS_BOOT_N */
83 gpiod = gpiod_get_index(dev, NULL, 6, GPIOD_OUT_LOW);
84 if (IS_ERR(gpiod)) {
85 err = PTR_ERR(gpiod);
86 goto out;
87 }
88 gpiod_put(gpiod);
89
90 /* PM_WDT_OUT */
91 gpiod = gpiod_get_index(dev, NULL, 7, GPIOD_OUT_LOW);
92 if (IS_ERR(gpiod)) {
93 err = PTR_ERR(gpiod);
94 goto out;
95 }
96 gpiod_put(gpiod);
97
98 return 0;
99 out:
100 simatic_ipc_leds_gpio_remove(pdev, table, table_extra);
101
102 return err;
103 }
104 EXPORT_SYMBOL_GPL(simatic_ipc_leds_gpio_probe);
105
106 MODULE_LICENSE("GPL v2");
107 MODULE_SOFTDEP("pre: platform:leds-gpio");
108 MODULE_AUTHOR("Henning Schild <henning.schild@siemens.com>");
109