135 lines
3.4 KiB
C
135 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Siemens SIMATIC IPC driver for LEDs
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*
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* Copyright (c) Siemens AG, 2018-2021
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*
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* Authors:
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* Henning Schild <henning.schild@siemens.com>
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* Jan Kiszka <jan.kiszka@siemens.com>
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* Gerd Haeussler <gerd.haeussler.ext@siemens.com>
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*/
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#include <linux/ioport.h>
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#include <linux/kernel.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/platform_data/x86/simatic-ipc-base.h>
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#include <linux/platform_device.h>
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#include <linux/sizes.h>
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#include <linux/spinlock.h>
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#define SIMATIC_IPC_LED_PORT_BASE 0x404E
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struct simatic_ipc_led {
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unsigned int value; /* mask for io */
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char *name;
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struct led_classdev cdev;
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};
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static struct simatic_ipc_led simatic_ipc_leds_io[] = {
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{1 << 15, "green:" LED_FUNCTION_STATUS "-1" },
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{1 << 7, "yellow:" LED_FUNCTION_STATUS "-1" },
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{1 << 14, "red:" LED_FUNCTION_STATUS "-2" },
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{1 << 6, "yellow:" LED_FUNCTION_STATUS "-2" },
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{1 << 13, "red:" LED_FUNCTION_STATUS "-3" },
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{1 << 5, "yellow:" LED_FUNCTION_STATUS "-3" },
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{ }
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};
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static struct resource simatic_ipc_led_io_res =
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DEFINE_RES_IO_NAMED(SIMATIC_IPC_LED_PORT_BASE, SZ_2, KBUILD_MODNAME);
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static DEFINE_SPINLOCK(reg_lock);
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static inline struct simatic_ipc_led *cdev_to_led(struct led_classdev *led_cd)
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{
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return container_of(led_cd, struct simatic_ipc_led, cdev);
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}
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static void simatic_ipc_led_set_io(struct led_classdev *led_cd,
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enum led_brightness brightness)
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{
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struct simatic_ipc_led *led = cdev_to_led(led_cd);
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unsigned long flags;
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unsigned int val;
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spin_lock_irqsave(®_lock, flags);
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val = inw(SIMATIC_IPC_LED_PORT_BASE);
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if (brightness == LED_OFF)
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outw(val | led->value, SIMATIC_IPC_LED_PORT_BASE);
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else
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outw(val & ~led->value, SIMATIC_IPC_LED_PORT_BASE);
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spin_unlock_irqrestore(®_lock, flags);
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}
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static enum led_brightness simatic_ipc_led_get_io(struct led_classdev *led_cd)
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{
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struct simatic_ipc_led *led = cdev_to_led(led_cd);
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return inw(SIMATIC_IPC_LED_PORT_BASE) & led->value ? LED_OFF : led_cd->max_brightness;
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}
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static int simatic_ipc_leds_probe(struct platform_device *pdev)
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{
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const struct simatic_ipc_platform *plat = pdev->dev.platform_data;
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struct device *dev = &pdev->dev;
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struct simatic_ipc_led *ipcled;
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struct led_classdev *cdev;
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struct resource *res;
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int err;
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switch (plat->devmode) {
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case SIMATIC_IPC_DEVICE_227D:
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case SIMATIC_IPC_DEVICE_427E:
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res = &simatic_ipc_led_io_res;
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ipcled = simatic_ipc_leds_io;
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/* on 227D the two bytes work the other way araound */
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if (plat->devmode == SIMATIC_IPC_DEVICE_227D) {
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while (ipcled->value) {
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ipcled->value = swab16(ipcled->value);
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ipcled++;
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}
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ipcled = simatic_ipc_leds_io;
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}
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if (!devm_request_region(dev, res->start, resource_size(res), KBUILD_MODNAME)) {
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dev_err(dev, "Unable to register IO resource at %pR\n", res);
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return -EBUSY;
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}
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break;
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default:
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return -ENODEV;
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}
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while (ipcled->value) {
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cdev = &ipcled->cdev;
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cdev->brightness_set = simatic_ipc_led_set_io;
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cdev->brightness_get = simatic_ipc_led_get_io;
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cdev->max_brightness = LED_ON;
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cdev->name = ipcled->name;
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err = devm_led_classdev_register(dev, cdev);
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if (err < 0)
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return err;
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ipcled++;
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}
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return 0;
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}
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static struct platform_driver simatic_ipc_led_driver = {
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.probe = simatic_ipc_leds_probe,
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.driver = {
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.name = KBUILD_MODNAME,
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}
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};
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module_platform_driver(simatic_ipc_led_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:" KBUILD_MODNAME);
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MODULE_AUTHOR("Henning Schild <henning.schild@siemens.com>");
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