Loading...
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Eurobraille/Iris power off support.
4 *
5 * Eurobraille's Iris machine is a PC with no APM or ACPI support.
6 * It is shutdown by a special I/O sequence which this module provides.
7 *
8 * Copyright (C) Shérab <Sebastien.Hinderer@ens-lyon.org>
9 */
10
11#include <linux/moduleparam.h>
12#include <linux/module.h>
13#include <linux/platform_device.h>
14#include <linux/kernel.h>
15#include <linux/errno.h>
16#include <linux/delay.h>
17#include <linux/pm.h>
18#include <asm/io.h>
19
20#define IRIS_GIO_BASE 0x340
21#define IRIS_GIO_INPUT IRIS_GIO_BASE
22#define IRIS_GIO_OUTPUT (IRIS_GIO_BASE + 1)
23#define IRIS_GIO_PULSE 0x80 /* First byte to send */
24#define IRIS_GIO_REST 0x00 /* Second byte to send */
25#define IRIS_GIO_NODEV 0xff /* Likely not an Iris */
26
27MODULE_LICENSE("GPL");
28MODULE_AUTHOR("Sébastien Hinderer <Sebastien.Hinderer@ens-lyon.org>");
29MODULE_DESCRIPTION("A power_off handler for Iris devices from EuroBraille");
30MODULE_SUPPORTED_DEVICE("Eurobraille/Iris");
31
32static bool force;
33
34module_param(force, bool, 0);
35MODULE_PARM_DESC(force, "Set to one to force poweroff handler installation.");
36
37static void (*old_pm_power_off)(void);
38
39static void iris_power_off(void)
40{
41 outb(IRIS_GIO_PULSE, IRIS_GIO_OUTPUT);
42 msleep(850);
43 outb(IRIS_GIO_REST, IRIS_GIO_OUTPUT);
44}
45
46/*
47 * Before installing the power_off handler, try to make sure the OS is
48 * running on an Iris. Since Iris does not support DMI, this is done
49 * by reading its input port and seeing whether the read value is
50 * meaningful.
51 */
52static int iris_probe(struct platform_device *pdev)
53{
54 unsigned char status = inb(IRIS_GIO_INPUT);
55 if (status == IRIS_GIO_NODEV) {
56 printk(KERN_ERR "This machine does not seem to be an Iris. "
57 "Power off handler not installed.\n");
58 return -ENODEV;
59 }
60 old_pm_power_off = pm_power_off;
61 pm_power_off = &iris_power_off;
62 printk(KERN_INFO "Iris power_off handler installed.\n");
63 return 0;
64}
65
66static int iris_remove(struct platform_device *pdev)
67{
68 pm_power_off = old_pm_power_off;
69 printk(KERN_INFO "Iris power_off handler uninstalled.\n");
70 return 0;
71}
72
73static struct platform_driver iris_driver = {
74 .driver = {
75 .name = "iris",
76 },
77 .probe = iris_probe,
78 .remove = iris_remove,
79};
80
81static struct resource iris_resources[] = {
82 {
83 .start = IRIS_GIO_BASE,
84 .end = IRIS_GIO_OUTPUT,
85 .flags = IORESOURCE_IO,
86 .name = "address"
87 }
88};
89
90static struct platform_device *iris_device;
91
92static int iris_init(void)
93{
94 int ret;
95 if (force != 1) {
96 printk(KERN_ERR "The force parameter has not been set to 1."
97 " The Iris poweroff handler will not be installed.\n");
98 return -ENODEV;
99 }
100 ret = platform_driver_register(&iris_driver);
101 if (ret < 0) {
102 printk(KERN_ERR "Failed to register iris platform driver: %d\n",
103 ret);
104 return ret;
105 }
106 iris_device = platform_device_register_simple("iris", (-1),
107 iris_resources, ARRAY_SIZE(iris_resources));
108 if (IS_ERR(iris_device)) {
109 printk(KERN_ERR "Failed to register iris platform device\n");
110 platform_driver_unregister(&iris_driver);
111 return PTR_ERR(iris_device);
112 }
113 return 0;
114}
115
116static void iris_exit(void)
117{
118 platform_device_unregister(iris_device);
119 platform_driver_unregister(&iris_driver);
120}
121
122module_init(iris_init);
123module_exit(iris_exit);
1/*
2 * Eurobraille/Iris power off support.
3 *
4 * Eurobraille's Iris machine is a PC with no APM or ACPI support.
5 * It is shutdown by a special I/O sequence which this module provides.
6 *
7 * Copyright (C) Shérab <Sebastien.Hinderer@ens-lyon.org>
8 *
9 * This program is free software ; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation ; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY ; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with the program ; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 */
23
24#include <linux/moduleparam.h>
25#include <linux/module.h>
26#include <linux/platform_device.h>
27#include <linux/kernel.h>
28#include <linux/errno.h>
29#include <linux/delay.h>
30#include <linux/pm.h>
31#include <asm/io.h>
32
33#define IRIS_GIO_BASE 0x340
34#define IRIS_GIO_INPUT IRIS_GIO_BASE
35#define IRIS_GIO_OUTPUT (IRIS_GIO_BASE + 1)
36#define IRIS_GIO_PULSE 0x80 /* First byte to send */
37#define IRIS_GIO_REST 0x00 /* Second byte to send */
38#define IRIS_GIO_NODEV 0xff /* Likely not an Iris */
39
40MODULE_LICENSE("GPL");
41MODULE_AUTHOR("Sébastien Hinderer <Sebastien.Hinderer@ens-lyon.org>");
42MODULE_DESCRIPTION("A power_off handler for Iris devices from EuroBraille");
43MODULE_SUPPORTED_DEVICE("Eurobraille/Iris");
44
45static bool force;
46
47module_param(force, bool, 0);
48MODULE_PARM_DESC(force, "Set to one to force poweroff handler installation.");
49
50static void (*old_pm_power_off)(void);
51
52static void iris_power_off(void)
53{
54 outb(IRIS_GIO_PULSE, IRIS_GIO_OUTPUT);
55 msleep(850);
56 outb(IRIS_GIO_REST, IRIS_GIO_OUTPUT);
57}
58
59/*
60 * Before installing the power_off handler, try to make sure the OS is
61 * running on an Iris. Since Iris does not support DMI, this is done
62 * by reading its input port and seeing whether the read value is
63 * meaningful.
64 */
65static int iris_probe(struct platform_device *pdev)
66{
67 unsigned char status = inb(IRIS_GIO_INPUT);
68 if (status == IRIS_GIO_NODEV) {
69 printk(KERN_ERR "This machine does not seem to be an Iris. "
70 "Power off handler not installed.\n");
71 return -ENODEV;
72 }
73 old_pm_power_off = pm_power_off;
74 pm_power_off = &iris_power_off;
75 printk(KERN_INFO "Iris power_off handler installed.\n");
76 return 0;
77}
78
79static int iris_remove(struct platform_device *pdev)
80{
81 pm_power_off = old_pm_power_off;
82 printk(KERN_INFO "Iris power_off handler uninstalled.\n");
83 return 0;
84}
85
86static struct platform_driver iris_driver = {
87 .driver = {
88 .name = "iris",
89 },
90 .probe = iris_probe,
91 .remove = iris_remove,
92};
93
94static struct resource iris_resources[] = {
95 {
96 .start = IRIS_GIO_BASE,
97 .end = IRIS_GIO_OUTPUT,
98 .flags = IORESOURCE_IO,
99 .name = "address"
100 }
101};
102
103static struct platform_device *iris_device;
104
105static int iris_init(void)
106{
107 int ret;
108 if (force != 1) {
109 printk(KERN_ERR "The force parameter has not been set to 1."
110 " The Iris poweroff handler will not be installed.\n");
111 return -ENODEV;
112 }
113 ret = platform_driver_register(&iris_driver);
114 if (ret < 0) {
115 printk(KERN_ERR "Failed to register iris platform driver: %d\n",
116 ret);
117 return ret;
118 }
119 iris_device = platform_device_register_simple("iris", (-1),
120 iris_resources, ARRAY_SIZE(iris_resources));
121 if (IS_ERR(iris_device)) {
122 printk(KERN_ERR "Failed to register iris platform device\n");
123 platform_driver_unregister(&iris_driver);
124 return PTR_ERR(iris_device);
125 }
126 return 0;
127}
128
129static void iris_exit(void)
130{
131 platform_device_unregister(iris_device);
132 platform_driver_unregister(&iris_driver);
133}
134
135module_init(iris_init);
136module_exit(iris_exit);