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Linux/arch/x86/platform/iris/iris.c

  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 
 40 MODULE_LICENSE("GPL");
 41 MODULE_AUTHOR("Sébastien Hinderer <Sebastien.Hinderer@ens-lyon.org>");
 42 MODULE_DESCRIPTION("A power_off handler for Iris devices from EuroBraille");
 43 MODULE_SUPPORTED_DEVICE("Eurobraille/Iris");
 44 
 45 static bool force;
 46 
 47 module_param(force, bool, 0);
 48 MODULE_PARM_DESC(force, "Set to one to force poweroff handler installation.");
 49 
 50 static void (*old_pm_power_off)(void);
 51 
 52 static 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  */
 65 static 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 
 79 static 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 
 86 static struct platform_driver iris_driver = {
 87         .driver         = {
 88                 .name   = "iris",
 89                 .owner  = THIS_MODULE,
 90         },
 91         .probe          = iris_probe,
 92         .remove         = iris_remove,
 93 };
 94 
 95 static struct resource iris_resources[] = {
 96         {
 97                 .start  = IRIS_GIO_BASE,
 98                 .end    = IRIS_GIO_OUTPUT,
 99                 .flags  = IORESOURCE_IO,
100                 .name   = "address"
101         }
102 };
103 
104 static struct platform_device *iris_device;
105 
106 static int iris_init(void)
107 {
108         int ret;
109         if (force != 1) {
110                 printk(KERN_ERR "The force parameter has not been set to 1."
111                         " The Iris poweroff handler will not be installed.\n");
112                 return -ENODEV;
113         }
114         ret = platform_driver_register(&iris_driver);
115         if (ret < 0) {
116                 printk(KERN_ERR "Failed to register iris platform driver: %d\n",
117                         ret);
118                 return ret;
119         }
120         iris_device = platform_device_register_simple("iris", (-1),
121                                 iris_resources, ARRAY_SIZE(iris_resources));
122         if (IS_ERR(iris_device)) {
123                 printk(KERN_ERR "Failed to register iris platform device\n");
124                 platform_driver_unregister(&iris_driver);
125                 return PTR_ERR(iris_device);
126         }
127         return 0;
128 }
129 
130 static void iris_exit(void)
131 {
132         platform_device_unregister(iris_device);
133         platform_driver_unregister(&iris_driver);
134 }
135 
136 module_init(iris_init);
137 module_exit(iris_exit);
138 

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