This source file includes following definitions.
- iris_power_off
- iris_probe
- iris_remove
- iris_init
- iris_exit
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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
24 #define IRIS_GIO_REST 0x00
25 #define IRIS_GIO_NODEV 0xff
26
27 MODULE_LICENSE("GPL");
28 MODULE_AUTHOR("Sébastien Hinderer <Sebastien.Hinderer@ens-lyon.org>");
29 MODULE_DESCRIPTION("A power_off handler for Iris devices from EuroBraille");
30 MODULE_SUPPORTED_DEVICE("Eurobraille/Iris");
31
32 static bool force;
33
34 module_param(force, bool, 0);
35 MODULE_PARM_DESC(force, "Set to one to force poweroff handler installation.");
36
37 static void (*old_pm_power_off)(void);
38
39 static 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 }
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51
52 static 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
66 static 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
73 static struct platform_driver iris_driver = {
74 .driver = {
75 .name = "iris",
76 },
77 .probe = iris_probe,
78 .remove = iris_remove,
79 };
80
81 static 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
90 static struct platform_device *iris_device;
91
92 static 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
116 static void iris_exit(void)
117 {
118 platform_device_unregister(iris_device);
119 platform_driver_unregister(&iris_driver);
120 }
121
122 module_init(iris_init);
123 module_exit(iris_exit);