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89ca1177 PF |
1 | /* |
2 | * OLPC XO-1.5 ebook switch driver | |
3 | * (based on generic ACPI button driver) | |
4 | * | |
5 | * Copyright (C) 2009 Paul Fox <pgf@laptop.org> | |
6 | * Copyright (C) 2010 One Laptop per Child | |
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 (at | |
11 | * your option) any later version. | |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/types.h> | |
18 | #include <linux/input.h> | |
19 | #include <acpi/acpi_bus.h> | |
20 | #include <acpi/acpi_drivers.h> | |
21 | ||
22 | #define MODULE_NAME "xo15-ebook" | |
23 | #define PREFIX MODULE_NAME ": " | |
24 | ||
25 | #define XO15_EBOOK_CLASS MODULE_NAME | |
26 | #define XO15_EBOOK_TYPE_UNKNOWN 0x00 | |
27 | #define XO15_EBOOK_NOTIFY_STATUS 0x80 | |
28 | ||
29 | #define XO15_EBOOK_SUBCLASS "ebook" | |
30 | #define XO15_EBOOK_HID "XO15EBK" | |
31 | #define XO15_EBOOK_DEVICE_NAME "EBook Switch" | |
32 | ||
33 | ACPI_MODULE_NAME(MODULE_NAME); | |
34 | ||
35 | MODULE_DESCRIPTION("OLPC XO-1.5 ebook switch driver"); | |
36 | MODULE_LICENSE("GPL"); | |
37 | ||
38 | static const struct acpi_device_id ebook_device_ids[] = { | |
39 | { XO15_EBOOK_HID, 0 }, | |
40 | { "", 0 }, | |
41 | }; | |
42 | MODULE_DEVICE_TABLE(acpi, ebook_device_ids); | |
43 | ||
44 | struct ebook_switch { | |
45 | struct input_dev *input; | |
46 | char phys[32]; /* for input device */ | |
47 | }; | |
48 | ||
49 | static int ebook_send_state(struct acpi_device *device) | |
50 | { | |
51 | struct ebook_switch *button = acpi_driver_data(device); | |
52 | unsigned long long state; | |
53 | acpi_status status; | |
54 | ||
55 | status = acpi_evaluate_integer(device->handle, "EBK", NULL, &state); | |
56 | if (ACPI_FAILURE(status)) | |
57 | return -EIO; | |
58 | ||
59 | /* input layer checks if event is redundant */ | |
60 | input_report_switch(button->input, SW_TABLET_MODE, !state); | |
61 | input_sync(button->input); | |
62 | return 0; | |
63 | } | |
64 | ||
65 | static void ebook_switch_notify(struct acpi_device *device, u32 event) | |
66 | { | |
67 | switch (event) { | |
68 | case ACPI_FIXED_HARDWARE_EVENT: | |
69 | case XO15_EBOOK_NOTIFY_STATUS: | |
70 | ebook_send_state(device); | |
71 | break; | |
72 | default: | |
73 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
74 | "Unsupported event [0x%x]\n", event)); | |
75 | break; | |
76 | } | |
77 | } | |
78 | ||
79 | static int ebook_switch_resume(struct acpi_device *device) | |
80 | { | |
81 | return ebook_send_state(device); | |
82 | } | |
83 | ||
84 | static int ebook_switch_add(struct acpi_device *device) | |
85 | { | |
86 | struct ebook_switch *button; | |
87 | struct input_dev *input; | |
88 | const char *hid = acpi_device_hid(device); | |
89 | char *name, *class; | |
90 | int error; | |
91 | ||
92 | button = kzalloc(sizeof(struct ebook_switch), GFP_KERNEL); | |
93 | if (!button) | |
94 | return -ENOMEM; | |
95 | ||
96 | device->driver_data = button; | |
97 | ||
98 | button->input = input = input_allocate_device(); | |
99 | if (!input) { | |
100 | error = -ENOMEM; | |
101 | goto err_free_button; | |
102 | } | |
103 | ||
104 | name = acpi_device_name(device); | |
105 | class = acpi_device_class(device); | |
106 | ||
107 | if (strcmp(hid, XO15_EBOOK_HID)) { | |
108 | printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", hid); | |
109 | error = -ENODEV; | |
110 | goto err_free_input; | |
111 | } | |
112 | ||
113 | strcpy(name, XO15_EBOOK_DEVICE_NAME); | |
114 | sprintf(class, "%s/%s", XO15_EBOOK_CLASS, XO15_EBOOK_SUBCLASS); | |
115 | ||
116 | snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid); | |
117 | ||
118 | input->name = name; | |
119 | input->phys = button->phys; | |
120 | input->id.bustype = BUS_HOST; | |
121 | input->dev.parent = &device->dev; | |
122 | ||
123 | input->evbit[0] = BIT_MASK(EV_SW); | |
124 | set_bit(SW_TABLET_MODE, input->swbit); | |
125 | ||
126 | error = input_register_device(input); | |
127 | if (error) | |
128 | goto err_free_input; | |
129 | ||
130 | ebook_send_state(device); | |
131 | ||
132 | if (device->wakeup.flags.valid) { | |
133 | /* Button's GPE is run-wake GPE */ | |
134 | acpi_enable_gpe(device->wakeup.gpe_device, | |
135 | device->wakeup.gpe_number); | |
89ca1177 PF |
136 | device_set_wakeup_enable(&device->dev, true); |
137 | } | |
138 | ||
139 | return 0; | |
140 | ||
141 | err_free_input: | |
142 | input_free_device(input); | |
143 | err_free_button: | |
144 | kfree(button); | |
145 | return error; | |
146 | } | |
147 | ||
148 | static int ebook_switch_remove(struct acpi_device *device, int type) | |
149 | { | |
150 | struct ebook_switch *button = acpi_driver_data(device); | |
151 | ||
152 | input_unregister_device(button->input); | |
153 | kfree(button); | |
154 | return 0; | |
155 | } | |
156 | ||
157 | static struct acpi_driver xo15_ebook_driver = { | |
158 | .name = MODULE_NAME, | |
159 | .class = XO15_EBOOK_CLASS, | |
160 | .ids = ebook_device_ids, | |
161 | .ops = { | |
162 | .add = ebook_switch_add, | |
163 | .resume = ebook_switch_resume, | |
164 | .remove = ebook_switch_remove, | |
165 | .notify = ebook_switch_notify, | |
166 | }, | |
167 | }; | |
168 | ||
169 | static int __init xo15_ebook_init(void) | |
170 | { | |
171 | return acpi_bus_register_driver(&xo15_ebook_driver); | |
172 | } | |
173 | ||
174 | static void __exit xo15_ebook_exit(void) | |
175 | { | |
176 | acpi_bus_unregister_driver(&xo15_ebook_driver); | |
177 | } | |
178 | ||
179 | module_init(xo15_ebook_init); | |
180 | module_exit(xo15_ebook_exit); |