1 /*
2 * ACPI driver for Topstar notebooks (hotkeys support only)
3 *
4 * Copyright (c) 2009 Herton Ronaldo Krzesinski <herton@mandriva.com.br>
5 *
6 * Implementation inspired by existing x86 platform drivers, in special
7 * asus/eepc/fujitsu-laptop, thanks to their authors
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 version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/slab.h>
20 #include <linux/acpi.h>
21 #include <linux/input.h>
22 #include <linux/input/sparse-keymap.h>
23
24 #define ACPI_TOPSTAR_CLASS "topstar"
25
26 struct topstar_hkey {
27 struct input_dev *inputdev;
28 };
29
30 static const struct key_entry topstar_keymap[] = {
31 { KE_KEY, 0x80, { KEY_BRIGHTNESSUP } },
32 { KE_KEY, 0x81, { KEY_BRIGHTNESSDOWN } },
33 { KE_KEY, 0x83, { KEY_VOLUMEUP } },
34 { KE_KEY, 0x84, { KEY_VOLUMEDOWN } },
35 { KE_KEY, 0x85, { KEY_MUTE } },
36 { KE_KEY, 0x86, { KEY_SWITCHVIDEOMODE } },
37 { KE_KEY, 0x87, { KEY_F13 } }, /* touchpad enable/disable key */
38 { KE_KEY, 0x88, { KEY_WLAN } },
39 { KE_KEY, 0x8a, { KEY_WWW } },
40 { KE_KEY, 0x8b, { KEY_MAIL } },
41 { KE_KEY, 0x8c, { KEY_MEDIA } },
42
43 /* Known non hotkey events don't handled or that we don't care yet */
44 { KE_IGNORE, 0x8e, },
45 { KE_IGNORE, 0x8f, },
46 { KE_IGNORE, 0x90, },
47
48 /*
49 * 'G key' generate two event codes, convert to only
50 * one event/key code for now, consider replacing by
51 * a switch (3G switch - SW_3G?)
52 */
53 { KE_KEY, 0x96, { KEY_F14 } },
54 { KE_KEY, 0x97, { KEY_F14 } },
55
56 { KE_END, 0 }
57 };
58
acpi_topstar_notify(struct acpi_device * device,u32 event)59 static void acpi_topstar_notify(struct acpi_device *device, u32 event)
60 {
61 static bool dup_evnt[2];
62 bool *dup;
63 struct topstar_hkey *hkey = acpi_driver_data(device);
64
65 /* 0x83 and 0x84 key events comes duplicated... */
66 if (event == 0x83 || event == 0x84) {
67 dup = &dup_evnt[event - 0x83];
68 if (*dup) {
69 *dup = false;
70 return;
71 }
72 *dup = true;
73 }
74
75 if (!sparse_keymap_report_event(hkey->inputdev, event, 1, true))
76 pr_info("unknown event = 0x%02x\n", event);
77 }
78
acpi_topstar_fncx_switch(struct acpi_device * device,bool state)79 static int acpi_topstar_fncx_switch(struct acpi_device *device, bool state)
80 {
81 acpi_status status;
82 union acpi_object fncx_params[1] = {
83 { .type = ACPI_TYPE_INTEGER }
84 };
85 struct acpi_object_list fncx_arg_list = { 1, &fncx_params[0] };
86
87 fncx_params[0].integer.value = state ? 0x86 : 0x87;
88 status = acpi_evaluate_object(device->handle, "FNCX", &fncx_arg_list, NULL);
89 if (ACPI_FAILURE(status)) {
90 pr_err("Unable to switch FNCX notifications\n");
91 return -ENODEV;
92 }
93
94 return 0;
95 }
96
acpi_topstar_init_hkey(struct topstar_hkey * hkey)97 static int acpi_topstar_init_hkey(struct topstar_hkey *hkey)
98 {
99 struct input_dev *input;
100 int error;
101
102 input = input_allocate_device();
103 if (!input) {
104 pr_err("Unable to allocate input device\n");
105 return -ENOMEM;
106 }
107
108 input->name = "Topstar Laptop extra buttons";
109 input->phys = "topstar/input0";
110 input->id.bustype = BUS_HOST;
111
112 error = sparse_keymap_setup(input, topstar_keymap, NULL);
113 if (error) {
114 pr_err("Unable to setup input device keymap\n");
115 goto err_free_dev;
116 }
117
118 error = input_register_device(input);
119 if (error) {
120 pr_err("Unable to register input device\n");
121 goto err_free_keymap;
122 }
123
124 hkey->inputdev = input;
125 return 0;
126
127 err_free_keymap:
128 sparse_keymap_free(input);
129 err_free_dev:
130 input_free_device(input);
131 return error;
132 }
133
acpi_topstar_add(struct acpi_device * device)134 static int acpi_topstar_add(struct acpi_device *device)
135 {
136 struct topstar_hkey *tps_hkey;
137
138 tps_hkey = kzalloc(sizeof(struct topstar_hkey), GFP_KERNEL);
139 if (!tps_hkey)
140 return -ENOMEM;
141
142 strcpy(acpi_device_name(device), "Topstar TPSACPI");
143 strcpy(acpi_device_class(device), ACPI_TOPSTAR_CLASS);
144
145 if (acpi_topstar_fncx_switch(device, true))
146 goto add_err;
147
148 if (acpi_topstar_init_hkey(tps_hkey))
149 goto add_err;
150
151 device->driver_data = tps_hkey;
152 return 0;
153
154 add_err:
155 kfree(tps_hkey);
156 return -ENODEV;
157 }
158
acpi_topstar_remove(struct acpi_device * device,int type)159 static int acpi_topstar_remove(struct acpi_device *device, int type)
160 {
161 struct topstar_hkey *tps_hkey = acpi_driver_data(device);
162
163 acpi_topstar_fncx_switch(device, false);
164
165 sparse_keymap_free(tps_hkey->inputdev);
166 input_unregister_device(tps_hkey->inputdev);
167 kfree(tps_hkey);
168
169 return 0;
170 }
171
172 static const struct acpi_device_id topstar_device_ids[] = {
173 { "TPSACPI01", 0 },
174 { "", 0 },
175 };
176 MODULE_DEVICE_TABLE(acpi, topstar_device_ids);
177
178 static struct acpi_driver acpi_topstar_driver = {
179 .name = "Topstar laptop ACPI driver",
180 .class = ACPI_TOPSTAR_CLASS,
181 .ids = topstar_device_ids,
182 .ops = {
183 .add = acpi_topstar_add,
184 .remove = acpi_topstar_remove,
185 .notify = acpi_topstar_notify,
186 },
187 };
188
topstar_laptop_init(void)189 static int __init topstar_laptop_init(void)
190 {
191 int ret;
192
193 ret = acpi_bus_register_driver(&acpi_topstar_driver);
194 if (ret < 0)
195 return ret;
196
197 printk(KERN_INFO "Topstar Laptop ACPI extras driver loaded\n");
198
199 return 0;
200 }
201
topstar_laptop_exit(void)202 static void __exit topstar_laptop_exit(void)
203 {
204 acpi_bus_unregister_driver(&acpi_topstar_driver);
205 }
206
207 module_init(topstar_laptop_init);
208 module_exit(topstar_laptop_exit);
209
210 MODULE_AUTHOR("Herton Ronaldo Krzesinski");
211 MODULE_DESCRIPTION("Topstar Laptop ACPI Extras driver");
212 MODULE_LICENSE("GPL");
213