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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#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/types.h>
20#include <linux/input.h>
21#include <linux/acpi.h>
22
23#define MODULE_NAME "xo15-ebook"
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
33ACPI_MODULE_NAME(MODULE_NAME);
34
35MODULE_DESCRIPTION("OLPC XO-1.5 ebook switch driver");
36MODULE_LICENSE("GPL");
37
38static const struct acpi_device_id ebook_device_ids[] = {
39 { XO15_EBOOK_HID, 0 },
40 { "", 0 },
41};
42MODULE_DEVICE_TABLE(acpi, ebook_device_ids);
43
44struct ebook_switch {
45 struct input_dev *input;
46 char phys[32]; /* for input device */
47};
48
49static 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
65static 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#ifdef CONFIG_PM_SLEEP
80static int ebook_switch_resume(struct device *dev)
81{
82 return ebook_send_state(to_acpi_device(dev));
83}
84#endif
85
86static SIMPLE_DEV_PM_OPS(ebook_switch_pm, NULL, ebook_switch_resume);
87
88static int ebook_switch_add(struct acpi_device *device)
89{
90 struct ebook_switch *button;
91 struct input_dev *input;
92 const char *hid = acpi_device_hid(device);
93 char *name, *class;
94 int error;
95
96 button = kzalloc(sizeof(struct ebook_switch), GFP_KERNEL);
97 if (!button)
98 return -ENOMEM;
99
100 device->driver_data = button;
101
102 button->input = input = input_allocate_device();
103 if (!input) {
104 error = -ENOMEM;
105 goto err_free_button;
106 }
107
108 name = acpi_device_name(device);
109 class = acpi_device_class(device);
110
111 if (strcmp(hid, XO15_EBOOK_HID)) {
112 pr_err("Unsupported hid [%s]\n", hid);
113 error = -ENODEV;
114 goto err_free_input;
115 }
116
117 strcpy(name, XO15_EBOOK_DEVICE_NAME);
118 sprintf(class, "%s/%s", XO15_EBOOK_CLASS, XO15_EBOOK_SUBCLASS);
119
120 snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid);
121
122 input->name = name;
123 input->phys = button->phys;
124 input->id.bustype = BUS_HOST;
125 input->dev.parent = &device->dev;
126
127 input->evbit[0] = BIT_MASK(EV_SW);
128 set_bit(SW_TABLET_MODE, input->swbit);
129
130 error = input_register_device(input);
131 if (error)
132 goto err_free_input;
133
134 ebook_send_state(device);
135
136 if (device->wakeup.flags.valid) {
137 /* Button's GPE is run-wake GPE */
138 acpi_enable_gpe(device->wakeup.gpe_device,
139 device->wakeup.gpe_number);
140 device_set_wakeup_enable(&device->dev, true);
141 }
142
143 return 0;
144
145 err_free_input:
146 input_free_device(input);
147 err_free_button:
148 kfree(button);
149 return error;
150}
151
152static int ebook_switch_remove(struct acpi_device *device)
153{
154 struct ebook_switch *button = acpi_driver_data(device);
155
156 input_unregister_device(button->input);
157 kfree(button);
158 return 0;
159}
160
161static struct acpi_driver xo15_ebook_driver = {
162 .name = MODULE_NAME,
163 .class = XO15_EBOOK_CLASS,
164 .ids = ebook_device_ids,
165 .ops = {
166 .add = ebook_switch_add,
167 .remove = ebook_switch_remove,
168 .notify = ebook_switch_notify,
169 },
170 .drv.pm = &ebook_switch_pm,
171};
172module_acpi_driver(xo15_ebook_driver);
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#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/types.h>
20#include <linux/input.h>
21#include <acpi/acpi_bus.h>
22#include <acpi/acpi_drivers.h>
23
24#define MODULE_NAME "xo15-ebook"
25
26#define XO15_EBOOK_CLASS MODULE_NAME
27#define XO15_EBOOK_TYPE_UNKNOWN 0x00
28#define XO15_EBOOK_NOTIFY_STATUS 0x80
29
30#define XO15_EBOOK_SUBCLASS "ebook"
31#define XO15_EBOOK_HID "XO15EBK"
32#define XO15_EBOOK_DEVICE_NAME "EBook Switch"
33
34ACPI_MODULE_NAME(MODULE_NAME);
35
36MODULE_DESCRIPTION("OLPC XO-1.5 ebook switch driver");
37MODULE_LICENSE("GPL");
38
39static const struct acpi_device_id ebook_device_ids[] = {
40 { XO15_EBOOK_HID, 0 },
41 { "", 0 },
42};
43MODULE_DEVICE_TABLE(acpi, ebook_device_ids);
44
45struct ebook_switch {
46 struct input_dev *input;
47 char phys[32]; /* for input device */
48};
49
50static int ebook_send_state(struct acpi_device *device)
51{
52 struct ebook_switch *button = acpi_driver_data(device);
53 unsigned long long state;
54 acpi_status status;
55
56 status = acpi_evaluate_integer(device->handle, "EBK", NULL, &state);
57 if (ACPI_FAILURE(status))
58 return -EIO;
59
60 /* input layer checks if event is redundant */
61 input_report_switch(button->input, SW_TABLET_MODE, !state);
62 input_sync(button->input);
63 return 0;
64}
65
66static void ebook_switch_notify(struct acpi_device *device, u32 event)
67{
68 switch (event) {
69 case ACPI_FIXED_HARDWARE_EVENT:
70 case XO15_EBOOK_NOTIFY_STATUS:
71 ebook_send_state(device);
72 break;
73 default:
74 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
75 "Unsupported event [0x%x]\n", event));
76 break;
77 }
78}
79
80static int ebook_switch_resume(struct acpi_device *device)
81{
82 return ebook_send_state(device);
83}
84
85static int ebook_switch_add(struct acpi_device *device)
86{
87 struct ebook_switch *button;
88 struct input_dev *input;
89 const char *hid = acpi_device_hid(device);
90 char *name, *class;
91 int error;
92
93 button = kzalloc(sizeof(struct ebook_switch), GFP_KERNEL);
94 if (!button)
95 return -ENOMEM;
96
97 device->driver_data = button;
98
99 button->input = input = input_allocate_device();
100 if (!input) {
101 error = -ENOMEM;
102 goto err_free_button;
103 }
104
105 name = acpi_device_name(device);
106 class = acpi_device_class(device);
107
108 if (strcmp(hid, XO15_EBOOK_HID)) {
109 pr_err("Unsupported hid [%s]\n", hid);
110 error = -ENODEV;
111 goto err_free_input;
112 }
113
114 strcpy(name, XO15_EBOOK_DEVICE_NAME);
115 sprintf(class, "%s/%s", XO15_EBOOK_CLASS, XO15_EBOOK_SUBCLASS);
116
117 snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid);
118
119 input->name = name;
120 input->phys = button->phys;
121 input->id.bustype = BUS_HOST;
122 input->dev.parent = &device->dev;
123
124 input->evbit[0] = BIT_MASK(EV_SW);
125 set_bit(SW_TABLET_MODE, input->swbit);
126
127 error = input_register_device(input);
128 if (error)
129 goto err_free_input;
130
131 ebook_send_state(device);
132
133 if (device->wakeup.flags.valid) {
134 /* Button's GPE is run-wake GPE */
135 acpi_enable_gpe(device->wakeup.gpe_device,
136 device->wakeup.gpe_number);
137 device_set_wakeup_enable(&device->dev, true);
138 }
139
140 return 0;
141
142 err_free_input:
143 input_free_device(input);
144 err_free_button:
145 kfree(button);
146 return error;
147}
148
149static int ebook_switch_remove(struct acpi_device *device, int type)
150{
151 struct ebook_switch *button = acpi_driver_data(device);
152
153 input_unregister_device(button->input);
154 kfree(button);
155 return 0;
156}
157
158static struct acpi_driver xo15_ebook_driver = {
159 .name = MODULE_NAME,
160 .class = XO15_EBOOK_CLASS,
161 .ids = ebook_device_ids,
162 .ops = {
163 .add = ebook_switch_add,
164 .resume = ebook_switch_resume,
165 .remove = ebook_switch_remove,
166 .notify = ebook_switch_notify,
167 },
168};
169
170static int __init xo15_ebook_init(void)
171{
172 return acpi_bus_register_driver(&xo15_ebook_driver);
173}
174
175static void __exit xo15_ebook_exit(void)
176{
177 acpi_bus_unregister_driver(&xo15_ebook_driver);
178}
179
180module_init(xo15_ebook_init);
181module_exit(xo15_ebook_exit);