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, 0x82, }, /* backlight event */
45 	{ KE_IGNORE, 0x8e, },
46 	{ KE_IGNORE, 0x8f, },
47 	{ KE_IGNORE, 0x90, },
48 
49 	/*
50 	 * 'G key' generate two event codes, convert to only
51 	 * one event/key code for now, consider replacing by
52 	 * a switch (3G switch - SW_3G?)
53 	 */
54 	{ KE_KEY, 0x96, { KEY_F14 } },
55 	{ KE_KEY, 0x97, { KEY_F14 } },
56 
57 	{ KE_END, 0 }
58 };
59 
60 static void acpi_topstar_notify(struct acpi_device *device, u32 event)
61 {
62 	static bool dup_evnt[2];
63 	bool *dup;
64 	struct topstar_hkey *hkey = acpi_driver_data(device);
65 
66 	/* 0x83 and 0x84 key events comes duplicated... */
67 	if (event == 0x83 || event == 0x84) {
68 		dup = &dup_evnt[event - 0x83];
69 		if (*dup) {
70 			*dup = false;
71 			return;
72 		}
73 		*dup = true;
74 	}
75 
76 	if (!sparse_keymap_report_event(hkey->inputdev, event, 1, true))
77 		pr_info("unknown event = 0x%02x\n", event);
78 }
79 
80 static int acpi_topstar_fncx_switch(struct acpi_device *device, bool state)
81 {
82 	acpi_status status;
83 
84 	status = acpi_execute_simple_method(device->handle, "FNCX",
85 						state ? 0x86 : 0x87);
86 	if (ACPI_FAILURE(status)) {
87 		pr_err("Unable to switch FNCX notifications\n");
88 		return -ENODEV;
89 	}
90 
91 	return 0;
92 }
93 
94 static int acpi_topstar_init_hkey(struct topstar_hkey *hkey)
95 {
96 	struct input_dev *input;
97 	int error;
98 
99 	input = input_allocate_device();
100 	if (!input)
101 		return -ENOMEM;
102 
103 	input->name = "Topstar Laptop extra buttons";
104 	input->phys = "topstar/input0";
105 	input->id.bustype = BUS_HOST;
106 
107 	error = sparse_keymap_setup(input, topstar_keymap, NULL);
108 	if (error) {
109 		pr_err("Unable to setup input device keymap\n");
110 		goto err_free_dev;
111 	}
112 
113 	error = input_register_device(input);
114 	if (error) {
115 		pr_err("Unable to register input device\n");
116 		goto err_free_keymap;
117 	}
118 
119 	hkey->inputdev = input;
120 	return 0;
121 
122  err_free_keymap:
123 	sparse_keymap_free(input);
124  err_free_dev:
125 	input_free_device(input);
126 	return error;
127 }
128 
129 static int acpi_topstar_add(struct acpi_device *device)
130 {
131 	struct topstar_hkey *tps_hkey;
132 
133 	tps_hkey = kzalloc(sizeof(struct topstar_hkey), GFP_KERNEL);
134 	if (!tps_hkey)
135 		return -ENOMEM;
136 
137 	strcpy(acpi_device_name(device), "Topstar TPSACPI");
138 	strcpy(acpi_device_class(device), ACPI_TOPSTAR_CLASS);
139 
140 	if (acpi_topstar_fncx_switch(device, true))
141 		goto add_err;
142 
143 	if (acpi_topstar_init_hkey(tps_hkey))
144 		goto add_err;
145 
146 	device->driver_data = tps_hkey;
147 	return 0;
148 
149 add_err:
150 	kfree(tps_hkey);
151 	return -ENODEV;
152 }
153 
154 static int acpi_topstar_remove(struct acpi_device *device)
155 {
156 	struct topstar_hkey *tps_hkey = acpi_driver_data(device);
157 
158 	acpi_topstar_fncx_switch(device, false);
159 
160 	sparse_keymap_free(tps_hkey->inputdev);
161 	input_unregister_device(tps_hkey->inputdev);
162 	kfree(tps_hkey);
163 
164 	return 0;
165 }
166 
167 static const struct acpi_device_id topstar_device_ids[] = {
168 	{ "TPSACPI01", 0 },
169 	{ "", 0 },
170 };
171 MODULE_DEVICE_TABLE(acpi, topstar_device_ids);
172 
173 static struct acpi_driver acpi_topstar_driver = {
174 	.name = "Topstar laptop ACPI driver",
175 	.class = ACPI_TOPSTAR_CLASS,
176 	.ids = topstar_device_ids,
177 	.ops = {
178 		.add = acpi_topstar_add,
179 		.remove = acpi_topstar_remove,
180 		.notify = acpi_topstar_notify,
181 	},
182 };
183 module_acpi_driver(acpi_topstar_driver);
184 
185 MODULE_AUTHOR("Herton Ronaldo Krzesinski");
186 MODULE_DESCRIPTION("Topstar Laptop ACPI Extras driver");
187 MODULE_LICENSE("GPL");
188