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24#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
25
26#include <linux/kernel.h>
27#include <linux/module.h>
28#include <linux/init.h>
29#include <linux/input.h>
30#include <linux/types.h>
31#include <asm/uaccess.h>
32#include <acpi/acpi_drivers.h>
33
34#define ACPI_ATLAS_NAME "Atlas ACPI"
35#define ACPI_ATLAS_CLASS "Atlas"
36
37static unsigned short atlas_keymap[16];
38static struct input_dev *input_dev;
39
40
41static acpi_status acpi_atlas_button_setup(acpi_handle region_handle,
42 u32 function, void *handler_context, void **return_context)
43{
44 *return_context =
45 (function != ACPI_REGION_DEACTIVATE) ? handler_context : NULL;
46
47 return AE_OK;
48}
49
50static acpi_status acpi_atlas_button_handler(u32 function,
51 acpi_physical_address address,
52 u32 bit_width, u64 *value,
53 void *handler_context, void *region_context)
54{
55 acpi_status status;
56
57 if (function == ACPI_WRITE) {
58 int code = address & 0x0f;
59 int key_down = !(address & 0x10);
60
61 input_event(input_dev, EV_MSC, MSC_SCAN, code);
62 input_report_key(input_dev, atlas_keymap[code], key_down);
63 input_sync(input_dev);
64
65 status = AE_OK;
66 } else {
67 pr_warn("shrugged on unexpected function: function=%x,address=%lx,value=%x\n",
68 function, (unsigned long)address, (u32)*value);
69 status = AE_BAD_PARAMETER;
70 }
71
72 return status;
73}
74
75static int atlas_acpi_button_add(struct acpi_device *device)
76{
77 acpi_status status;
78 int i;
79 int err;
80
81 input_dev = input_allocate_device();
82 if (!input_dev) {
83 pr_err("unable to allocate input device\n");
84 return -ENOMEM;
85 }
86
87 input_dev->name = "Atlas ACPI button driver";
88 input_dev->phys = "ASIM0000/atlas/input0";
89 input_dev->id.bustype = BUS_HOST;
90 input_dev->keycode = atlas_keymap;
91 input_dev->keycodesize = sizeof(unsigned short);
92 input_dev->keycodemax = ARRAY_SIZE(atlas_keymap);
93
94 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
95 __set_bit(EV_KEY, input_dev->evbit);
96 for (i = 0; i < ARRAY_SIZE(atlas_keymap); i++) {
97 if (i < 9) {
98 atlas_keymap[i] = KEY_F1 + i;
99 __set_bit(KEY_F1 + i, input_dev->keybit);
100 } else
101 atlas_keymap[i] = KEY_RESERVED;
102 }
103
104 err = input_register_device(input_dev);
105 if (err) {
106 pr_err("couldn't register input device\n");
107 input_free_device(input_dev);
108 return err;
109 }
110
111
112 status = acpi_install_address_space_handler(device->handle,
113 0x81, &acpi_atlas_button_handler,
114 &acpi_atlas_button_setup, device);
115 if (ACPI_FAILURE(status)) {
116 pr_err("error installing addr spc handler\n");
117 input_unregister_device(input_dev);
118 err = -EINVAL;
119 }
120
121 return err;
122}
123
124static int atlas_acpi_button_remove(struct acpi_device *device, int type)
125{
126 acpi_status status;
127
128 status = acpi_remove_address_space_handler(device->handle,
129 0x81, &acpi_atlas_button_handler);
130 if (ACPI_FAILURE(status))
131 pr_err("error removing addr spc handler\n");
132
133 input_unregister_device(input_dev);
134
135 return 0;
136}
137
138static const struct acpi_device_id atlas_device_ids[] = {
139 {"ASIM0000", 0},
140 {"", 0},
141};
142MODULE_DEVICE_TABLE(acpi, atlas_device_ids);
143
144static struct acpi_driver atlas_acpi_driver = {
145 .name = ACPI_ATLAS_NAME,
146 .class = ACPI_ATLAS_CLASS,
147 .owner = THIS_MODULE,
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 if (acpi_disabled)
158 return -ENODEV;
159
160 return acpi_bus_register_driver(&atlas_acpi_driver);
161}
162
163static void __exit atlas_acpi_exit(void)
164{
165 acpi_bus_unregister_driver(&atlas_acpi_driver);
166}
167
168module_init(atlas_acpi_init);
169module_exit(atlas_acpi_exit);
170
171MODULE_AUTHOR("Jaya Kumar");
172MODULE_LICENSE("GPL");
173MODULE_DESCRIPTION("Atlas button driver");
174
175
