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24#include <linux/kernel.h>
25#include <linux/module.h>
26#include <linux/init.h>
27#include <linux/input.h>
28#include <linux/types.h>
29#include <asm/uaccess.h>
30#include <acpi/acpi_drivers.h>
31
32#define ACPI_ATLAS_NAME "Atlas ACPI"
33#define ACPI_ATLAS_CLASS "Atlas"
34
35static unsigned short atlas_keymap[16];
36static struct input_dev *input_dev;
37
38
39static acpi_status acpi_atlas_button_setup(acpi_handle region_handle,
40 u32 function, void *handler_context, void **return_context)
41{
42 *return_context =
43 (function != ACPI_REGION_DEACTIVATE) ? handler_context : NULL;
44
45 return AE_OK;
46}
47
48static acpi_status acpi_atlas_button_handler(u32 function,
49 acpi_physical_address address,
50 u32 bit_width, acpi_integer *value,
51 void *handler_context, void *region_context)
52{
53 acpi_status status;
54
55 if (function == ACPI_WRITE) {
56 int code = address & 0x0f;
57 int key_down = !(address & 0x10);
58
59 input_event(input_dev, EV_MSC, MSC_SCAN, code);
60 input_report_key(input_dev, atlas_keymap[code], key_down);
61 input_sync(input_dev);
62
63 status = 0;
64 } else {
65 printk(KERN_WARNING "atlas: shrugged on unexpected function"
66 ":function=%x,address=%lx,value=%x\n",
67 function, (unsigned long)address, (u32)*value);
68 status = -EINVAL;
69 }
70
71 return status;
72}
73
74static int atlas_acpi_button_add(struct acpi_device *device)
75{
76 acpi_status status;
77 int i;
78 int err;
79
80 input_dev = input_allocate_device();
81 if (!input_dev) {
82 printk(KERN_ERR "atlas: unable to allocate input device\n");
83 return -ENOMEM;
84 }
85
86 input_dev->name = "Atlas ACPI button driver";
87 input_dev->phys = "ASIM0000/atlas/input0";
88 input_dev->id.bustype = BUS_HOST;
89 input_dev->keycode = atlas_keymap;
90 input_dev->keycodesize = sizeof(unsigned short);
91 input_dev->keycodemax = ARRAY_SIZE(atlas_keymap);
92
93 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
94 __set_bit(EV_KEY, input_dev->evbit);
95 for (i = 0; i < ARRAY_SIZE(atlas_keymap); i++) {
96 if (i < 9) {
97 atlas_keymap[i] = KEY_F1 + i;
98 __set_bit(KEY_F1 + i, input_dev->keybit);
99 } else
100 atlas_keymap[i] = KEY_RESERVED;
101 }
102
103 err = input_register_device(input_dev);
104 if (err) {
105 printk(KERN_ERR "atlas: couldn't register input device\n");
106 input_free_device(input_dev);
107 return err;
108 }
109
110
111 status = acpi_install_address_space_handler(device->handle,
112 0x81, &acpi_atlas_button_handler,
113 &acpi_atlas_button_setup, device);
114 if (ACPI_FAILURE(status)) {
115 printk(KERN_ERR "Atlas: Error installing addr spc handler\n");
116 input_unregister_device(input_dev);
117 status = -EINVAL;
118 }
119
120 return status;
121}
122
123static int atlas_acpi_button_remove(struct acpi_device *device, int type)
124{
125 acpi_status status;
126
127 status = acpi_remove_address_space_handler(device->handle,
128 0x81, &acpi_atlas_button_handler);
129 if (ACPI_FAILURE(status)) {
130 printk(KERN_ERR "Atlas: Error removing addr spc handler\n");
131 status = -EINVAL;
132 }
133
134 input_unregister_device(input_dev);
135
136 return status;
137}
138
139static const struct acpi_device_id atlas_device_ids[] = {
140 {"ASIM0000", 0},
141 {"", 0},
142};
143MODULE_DEVICE_TABLE(acpi, atlas_device_ids);
144
145static struct acpi_driver atlas_acpi_driver = {
146 .name = ACPI_ATLAS_NAME,
147 .class = ACPI_ATLAS_CLASS,
148 .ids = atlas_device_ids,
149 .ops = {
150 .add = atlas_acpi_button_add,
151 .remove = atlas_acpi_button_remove,
152 },
153};
154
155static int __init atlas_acpi_init(void)
156{
157 int result;
158
159 if (acpi_disabled)
160 return -ENODEV;
161
162 result = acpi_bus_register_driver(&atlas_acpi_driver);
163 if (result < 0) {
164 printk(KERN_ERR "Atlas ACPI: Unable to register driver\n");
165 return -ENODEV;
166 }
167
168 return 0;
169}
170
171static void __exit atlas_acpi_exit(void)
172{
173 acpi_bus_unregister_driver(&atlas_acpi_driver);
174}
175
176module_init(atlas_acpi_init);
177module_exit(atlas_acpi_exit);
178
179MODULE_AUTHOR("Jaya Kumar");
180MODULE_LICENSE("GPL");
181MODULE_DESCRIPTION("Atlas button driver");
182
183
