1 /*
2 * atlas_btns.c - Atlas Wallmount Touchscreen ACPI Extras
3 *
4 * Copyright (C) 2006 Jaya Kumar
5 * Based on Toshiba ACPI by John Belmonte and ASUS ACPI
6 * This work was sponsored by CIS(M) Sdn Bhd.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 */
23
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
35 static unsigned short atlas_keymap[16];
36 static struct input_dev *input_dev;
37
38 /* button handling code */
39 static 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
48 static 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
74 static 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 /* hookup button handler */
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
123 static 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
139 static const struct acpi_device_id atlas_device_ids[] = {
140 {"ASIM0000", 0},
141 {"", 0},
142 };
143 MODULE_DEVICE_TABLE(acpi, atlas_device_ids);
144
145 static 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
155 static 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
171 static void __exit atlas_acpi_exit(void)
172 {
173 acpi_bus_unregister_driver(&atlas_acpi_driver);
174 }
175
176 module_init(atlas_acpi_init);
177 module_exit(atlas_acpi_exit);
178
179 MODULE_AUTHOR("Jaya Kumar");
180 MODULE_LICENSE("GPL");
181 MODULE_DESCRIPTION("Atlas button driver");
182
183
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