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6417f03132
MODULE_SUPPORTED_DEVICE was added in pre-git era and never was implemented. We can safely remove it, because the kernel has grown to have many more reliable mechanisms to determine if device is supported or not. Signed-off-by: Leon Romanovsky <leonro@nvidia.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
123 lines
3.1 KiB
C
123 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Eurobraille/Iris power off support.
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*
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* Eurobraille's Iris machine is a PC with no APM or ACPI support.
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* It is shutdown by a special I/O sequence which this module provides.
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*
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* Copyright (C) Shérab <Sebastien.Hinderer@ens-lyon.org>
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*/
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#include <linux/moduleparam.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/delay.h>
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#include <linux/pm.h>
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#include <asm/io.h>
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#define IRIS_GIO_BASE 0x340
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#define IRIS_GIO_INPUT IRIS_GIO_BASE
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#define IRIS_GIO_OUTPUT (IRIS_GIO_BASE + 1)
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#define IRIS_GIO_PULSE 0x80 /* First byte to send */
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#define IRIS_GIO_REST 0x00 /* Second byte to send */
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#define IRIS_GIO_NODEV 0xff /* Likely not an Iris */
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Sébastien Hinderer <Sebastien.Hinderer@ens-lyon.org>");
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MODULE_DESCRIPTION("A power_off handler for Iris devices from EuroBraille");
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static bool force;
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module_param(force, bool, 0);
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MODULE_PARM_DESC(force, "Set to one to force poweroff handler installation.");
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static void (*old_pm_power_off)(void);
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static void iris_power_off(void)
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{
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outb(IRIS_GIO_PULSE, IRIS_GIO_OUTPUT);
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msleep(850);
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outb(IRIS_GIO_REST, IRIS_GIO_OUTPUT);
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}
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/*
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* Before installing the power_off handler, try to make sure the OS is
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* running on an Iris. Since Iris does not support DMI, this is done
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* by reading its input port and seeing whether the read value is
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* meaningful.
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*/
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static int iris_probe(struct platform_device *pdev)
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{
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unsigned char status = inb(IRIS_GIO_INPUT);
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if (status == IRIS_GIO_NODEV) {
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printk(KERN_ERR "This machine does not seem to be an Iris. "
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"Power off handler not installed.\n");
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return -ENODEV;
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}
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old_pm_power_off = pm_power_off;
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pm_power_off = &iris_power_off;
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printk(KERN_INFO "Iris power_off handler installed.\n");
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return 0;
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}
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static int iris_remove(struct platform_device *pdev)
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{
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pm_power_off = old_pm_power_off;
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printk(KERN_INFO "Iris power_off handler uninstalled.\n");
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return 0;
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}
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static struct platform_driver iris_driver = {
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.driver = {
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.name = "iris",
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},
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.probe = iris_probe,
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.remove = iris_remove,
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};
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static struct resource iris_resources[] = {
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{
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.start = IRIS_GIO_BASE,
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.end = IRIS_GIO_OUTPUT,
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.flags = IORESOURCE_IO,
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.name = "address"
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}
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};
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static struct platform_device *iris_device;
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static int iris_init(void)
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{
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int ret;
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if (force != 1) {
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printk(KERN_ERR "The force parameter has not been set to 1."
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" The Iris poweroff handler will not be installed.\n");
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return -ENODEV;
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}
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ret = platform_driver_register(&iris_driver);
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if (ret < 0) {
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printk(KERN_ERR "Failed to register iris platform driver: %d\n",
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ret);
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return ret;
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}
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iris_device = platform_device_register_simple("iris", (-1),
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iris_resources, ARRAY_SIZE(iris_resources));
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if (IS_ERR(iris_device)) {
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printk(KERN_ERR "Failed to register iris platform device\n");
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platform_driver_unregister(&iris_driver);
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return PTR_ERR(iris_device);
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}
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return 0;
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}
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static void iris_exit(void)
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{
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platform_device_unregister(iris_device);
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platform_driver_unregister(&iris_driver);
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}
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module_init(iris_init);
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module_exit(iris_exit);
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