xref: /openbmc/linux/drivers/input/misc/atlas_btns.c (revision 22246614)
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