tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Siemens SIMATIC IPC driver for GPIO based LEDs
4 *
5 * Copyright (c) Siemens AG, 2022
6 *
7 * Authors:
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
18static struct gpiod_lookup_table *simatic_ipc_led_gpio_table;
19
20static struct gpiod_lookup_table simatic_ipc_led_gpio_table_127e = {
21 .dev_id = "leds-gpio",
22 .table = {
23 GPIO_LOOKUP_IDX("apollolake-pinctrl.0", 52, NULL, 0, GPIO_ACTIVE_LOW),
24 GPIO_LOOKUP_IDX("apollolake-pinctrl.0", 53, NULL, 1, GPIO_ACTIVE_LOW),
25 GPIO_LOOKUP_IDX("apollolake-pinctrl.0", 57, NULL, 2, GPIO_ACTIVE_LOW),
26 GPIO_LOOKUP_IDX("apollolake-pinctrl.0", 58, NULL, 3, GPIO_ACTIVE_LOW),
27 GPIO_LOOKUP_IDX("apollolake-pinctrl.0", 60, NULL, 4, GPIO_ACTIVE_LOW),
28 GPIO_LOOKUP_IDX("apollolake-pinctrl.0", 51, NULL, 5, GPIO_ACTIVE_LOW),
29 GPIO_LOOKUP_IDX("apollolake-pinctrl.0", 56, NULL, 6, GPIO_ACTIVE_LOW),
30 GPIO_LOOKUP_IDX("apollolake-pinctrl.0", 59, NULL, 7, GPIO_ACTIVE_HIGH),
31 },
32};
33
34static struct gpiod_lookup_table simatic_ipc_led_gpio_table_227g = {
35 .dev_id = "leds-gpio",
36 .table = {
37 GPIO_LOOKUP_IDX("gpio-f7188x-2", 0, NULL, 0, GPIO_ACTIVE_LOW),
38 GPIO_LOOKUP_IDX("gpio-f7188x-2", 1, NULL, 1, GPIO_ACTIVE_LOW),
39 GPIO_LOOKUP_IDX("gpio-f7188x-2", 2, NULL, 2, GPIO_ACTIVE_LOW),
40 GPIO_LOOKUP_IDX("gpio-f7188x-2", 3, NULL, 3, GPIO_ACTIVE_LOW),
41 GPIO_LOOKUP_IDX("gpio-f7188x-2", 4, NULL, 4, GPIO_ACTIVE_LOW),
42 GPIO_LOOKUP_IDX("gpio-f7188x-2", 5, NULL, 5, GPIO_ACTIVE_LOW),
43 GPIO_LOOKUP_IDX("gpio-f7188x-3", 6, NULL, 6, GPIO_ACTIVE_HIGH),
44 GPIO_LOOKUP_IDX("gpio-f7188x-3", 7, NULL, 7, GPIO_ACTIVE_HIGH),
45 }
46};
47
48static const struct gpio_led simatic_ipc_gpio_leds[] = {
49 { .name = "red:" LED_FUNCTION_STATUS "-1" },
50 { .name = "green:" LED_FUNCTION_STATUS "-1" },
51 { .name = "red:" LED_FUNCTION_STATUS "-2" },
52 { .name = "green:" LED_FUNCTION_STATUS "-2" },
53 { .name = "red:" LED_FUNCTION_STATUS "-3" },
54 { .name = "green:" LED_FUNCTION_STATUS "-3" },
55};
56
57static const struct gpio_led_platform_data simatic_ipc_gpio_leds_pdata = {
58 .num_leds = ARRAY_SIZE(simatic_ipc_gpio_leds),
59 .leds = simatic_ipc_gpio_leds,
60};
61
62static struct platform_device *simatic_leds_pdev;
63
64static int simatic_ipc_leds_gpio_remove(struct platform_device *pdev)
65{
66 gpiod_remove_lookup_table(simatic_ipc_led_gpio_table);
67 platform_device_unregister(simatic_leds_pdev);
68
69 return 0;
70}
71
72static int simatic_ipc_leds_gpio_probe(struct platform_device *pdev)
73{
74 const struct simatic_ipc_platform *plat = pdev->dev.platform_data;
75 struct gpio_desc *gpiod;
76 int err;
77
78 switch (plat->devmode) {
79 case SIMATIC_IPC_DEVICE_127E:
80 simatic_ipc_led_gpio_table = &simatic_ipc_led_gpio_table_127e;
81 break;
82 case SIMATIC_IPC_DEVICE_227G:
83 if (!IS_ENABLED(CONFIG_GPIO_F7188X))
84 return -ENODEV;
85 request_module("gpio-f7188x");
86 simatic_ipc_led_gpio_table = &simatic_ipc_led_gpio_table_227g;
87 break;
88 default:
89 return -ENODEV;
90 }
91
92 gpiod_add_lookup_table(simatic_ipc_led_gpio_table);
93 simatic_leds_pdev = platform_device_register_resndata(NULL,
94 "leds-gpio", PLATFORM_DEVID_NONE, NULL, 0,
95 &simatic_ipc_gpio_leds_pdata,
96 sizeof(simatic_ipc_gpio_leds_pdata));
97 if (IS_ERR(simatic_leds_pdev)) {
98 err = PTR_ERR(simatic_leds_pdev);
99 goto out;
100 }
101
102 /* PM_BIOS_BOOT_N */
103 gpiod = gpiod_get_index(&simatic_leds_pdev->dev, NULL, 6, GPIOD_OUT_LOW);
104 if (IS_ERR(gpiod)) {
105 err = PTR_ERR(gpiod);
106 goto out;
107 }
108 gpiod_put(gpiod);
109
110 /* PM_WDT_OUT */
111 gpiod = gpiod_get_index(&simatic_leds_pdev->dev, NULL, 7, GPIOD_OUT_LOW);
112 if (IS_ERR(gpiod)) {
113 err = PTR_ERR(gpiod);
114 goto out;
115 }
116 gpiod_put(gpiod);
117
118 return 0;
119out:
120 simatic_ipc_leds_gpio_remove(pdev);
121
122 return err;
123}
124
125static struct platform_driver simatic_ipc_led_gpio_driver = {
126 .probe = simatic_ipc_leds_gpio_probe,
127 .remove = simatic_ipc_leds_gpio_remove,
128 .driver = {
129 .name = KBUILD_MODNAME,
130 }
131};
132module_platform_driver(simatic_ipc_led_gpio_driver);
133
134MODULE_LICENSE("GPL v2");
135MODULE_ALIAS("platform:" KBUILD_MODNAME);
136MODULE_SOFTDEP("pre: platform:leds-gpio");
137MODULE_AUTHOR("Henning Schild <henning.schild@siemens.com>");