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

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * Siemens SIMATIC IPC driver for GPIO based LEDs
0004  *
0005  * Copyright (c) Siemens AG, 2022
0006  *
0007  * Authors:
0008  *  Henning Schild <henning.schild@siemens.com>
0009  */
0010
0011 #include <linux/gpio/machine.h>
0012 #include <linux/gpio/consumer.h>
0013 #include <linux/leds.h>
0014 #include <linux/module.h>
0015 #include <linux/platform_device.h>
0016
0017 static struct gpiod_lookup_table simatic_ipc_led_gpio_table = {
0018     .dev_id = "leds-gpio",
0019     .table = {
0020         GPIO_LOOKUP_IDX("apollolake-pinctrl.0", 51, NULL, 0, GPIO_ACTIVE_LOW),
0021         GPIO_LOOKUP_IDX("apollolake-pinctrl.0", 52, NULL, 1, GPIO_ACTIVE_LOW),
0022         GPIO_LOOKUP_IDX("apollolake-pinctrl.0", 53, NULL, 2, GPIO_ACTIVE_LOW),
0023         GPIO_LOOKUP_IDX("apollolake-pinctrl.0", 57, NULL, 3, GPIO_ACTIVE_LOW),
0024         GPIO_LOOKUP_IDX("apollolake-pinctrl.0", 58, NULL, 4, GPIO_ACTIVE_LOW),
0025         GPIO_LOOKUP_IDX("apollolake-pinctrl.0", 60, NULL, 5, GPIO_ACTIVE_LOW),
0026         GPIO_LOOKUP_IDX("apollolake-pinctrl.0", 56, NULL, 6, GPIO_ACTIVE_LOW),
0027         GPIO_LOOKUP_IDX("apollolake-pinctrl.0", 59, NULL, 7, GPIO_ACTIVE_HIGH),
0028     },
0029 };
0030
0031 static const struct gpio_led simatic_ipc_gpio_leds[] = {
0032     { .name = "green:" LED_FUNCTION_STATUS "-3" },
0033     { .name = "red:" LED_FUNCTION_STATUS "-1" },
0034     { .name = "green:" LED_FUNCTION_STATUS "-1" },
0035     { .name = "red:" LED_FUNCTION_STATUS "-2" },
0036     { .name = "green:" LED_FUNCTION_STATUS "-2" },
0037     { .name = "red:" LED_FUNCTION_STATUS "-3" },
0038 };
0039
0040 static const struct gpio_led_platform_data simatic_ipc_gpio_leds_pdata = {
0041     .num_leds   = ARRAY_SIZE(simatic_ipc_gpio_leds),
0042     .leds       = simatic_ipc_gpio_leds,
0043 };
0044
0045 static struct platform_device *simatic_leds_pdev;
0046
0047 static int simatic_ipc_leds_gpio_remove(struct platform_device *pdev)
0048 {
0049     gpiod_remove_lookup_table(&simatic_ipc_led_gpio_table);
0050     platform_device_unregister(simatic_leds_pdev);
0051
0052     return 0;
0053 }
0054
0055 static int simatic_ipc_leds_gpio_probe(struct platform_device *pdev)
0056 {
0057     struct gpio_desc *gpiod;
0058     int err;
0059
0060     gpiod_add_lookup_table(&simatic_ipc_led_gpio_table);
0061     simatic_leds_pdev = platform_device_register_resndata(NULL,
0062         "leds-gpio", PLATFORM_DEVID_NONE, NULL, 0,
0063         &simatic_ipc_gpio_leds_pdata,
0064         sizeof(simatic_ipc_gpio_leds_pdata));
0065     if (IS_ERR(simatic_leds_pdev)) {
0066         err = PTR_ERR(simatic_leds_pdev);
0067         goto out;
0068     }
0069
0070     /* PM_BIOS_BOOT_N */
0071     gpiod = gpiod_get_index(&simatic_leds_pdev->dev, NULL, 6, GPIOD_OUT_LOW);
0072     if (IS_ERR(gpiod)) {
0073         err = PTR_ERR(gpiod);
0074         goto out;
0075     }
0076     gpiod_put(gpiod);
0077
0078     /* PM_WDT_OUT */
0079     gpiod = gpiod_get_index(&simatic_leds_pdev->dev, NULL, 7, GPIOD_OUT_LOW);
0080     if (IS_ERR(gpiod)) {
0081         err = PTR_ERR(gpiod);
0082         goto out;
0083     }
0084     gpiod_put(gpiod);
0085
0086     return 0;
0087 out:
0088     simatic_ipc_leds_gpio_remove(pdev);
0089
0090     return err;
0091 }
0092
0093 static struct platform_driver simatic_ipc_led_gpio_driver = {
0094     .probe = simatic_ipc_leds_gpio_probe,
0095     .remove = simatic_ipc_leds_gpio_remove,
0096     .driver = {
0097         .name = KBUILD_MODNAME,
0098     }
0099 };
0100 module_platform_driver(simatic_ipc_led_gpio_driver);
0101
0102 MODULE_LICENSE("GPL v2");
0103 MODULE_ALIAS("platform:" KBUILD_MODNAME);
0104 MODULE_SOFTDEP("pre: platform:leds-gpio");
0105 MODULE_AUTHOR("Henning Schild <henning.schild@siemens.com>");