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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 <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);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * OLPC XO-1.5 ebook switch driver
4 * (based on generic ACPI button driver)
5 *
6 * Copyright (C) 2009 Paul Fox <pgf@laptop.org>
7 * Copyright (C) 2010 One Laptop per Child
8 */
9
10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/types.h>
16#include <linux/input.h>
17#include <linux/acpi.h>
18
19#define MODULE_NAME "xo15-ebook"
20
21#define XO15_EBOOK_CLASS MODULE_NAME
22#define XO15_EBOOK_TYPE_UNKNOWN 0x00
23#define XO15_EBOOK_NOTIFY_STATUS 0x80
24
25#define XO15_EBOOK_SUBCLASS "ebook"
26#define XO15_EBOOK_HID "XO15EBK"
27#define XO15_EBOOK_DEVICE_NAME "EBook Switch"
28
29MODULE_DESCRIPTION("OLPC XO-1.5 ebook switch driver");
30MODULE_LICENSE("GPL");
31
32static const struct acpi_device_id ebook_device_ids[] = {
33 { XO15_EBOOK_HID, 0 },
34 { "", 0 },
35};
36MODULE_DEVICE_TABLE(acpi, ebook_device_ids);
37
38struct ebook_switch {
39 struct input_dev *input;
40 char phys[32]; /* for input device */
41};
42
43static int ebook_send_state(struct acpi_device *device)
44{
45 struct ebook_switch *button = acpi_driver_data(device);
46 unsigned long long state;
47 acpi_status status;
48
49 status = acpi_evaluate_integer(device->handle, "EBK", NULL, &state);
50 if (ACPI_FAILURE(status))
51 return -EIO;
52
53 /* input layer checks if event is redundant */
54 input_report_switch(button->input, SW_TABLET_MODE, !state);
55 input_sync(button->input);
56 return 0;
57}
58
59static void ebook_switch_notify(struct acpi_device *device, u32 event)
60{
61 switch (event) {
62 case ACPI_FIXED_HARDWARE_EVENT:
63 case XO15_EBOOK_NOTIFY_STATUS:
64 ebook_send_state(device);
65 break;
66 default:
67 acpi_handle_debug(device->handle,
68 "Unsupported event [0x%x]\n", event);
69 break;
70 }
71}
72
73#ifdef CONFIG_PM_SLEEP
74static int ebook_switch_resume(struct device *dev)
75{
76 return ebook_send_state(to_acpi_device(dev));
77}
78#endif
79
80static SIMPLE_DEV_PM_OPS(ebook_switch_pm, NULL, ebook_switch_resume);
81
82static int ebook_switch_add(struct acpi_device *device)
83{
84 struct ebook_switch *button;
85 struct input_dev *input;
86 const char *hid = acpi_device_hid(device);
87 char *name, *class;
88 int error;
89
90 button = kzalloc(sizeof(struct ebook_switch), GFP_KERNEL);
91 if (!button)
92 return -ENOMEM;
93
94 device->driver_data = button;
95
96 button->input = input = input_allocate_device();
97 if (!input) {
98 error = -ENOMEM;
99 goto err_free_button;
100 }
101
102 name = acpi_device_name(device);
103 class = acpi_device_class(device);
104
105 if (strcmp(hid, XO15_EBOOK_HID)) {
106 pr_err("Unsupported hid [%s]\n", hid);
107 error = -ENODEV;
108 goto err_free_input;
109 }
110
111 strcpy(name, XO15_EBOOK_DEVICE_NAME);
112 sprintf(class, "%s/%s", XO15_EBOOK_CLASS, XO15_EBOOK_SUBCLASS);
113
114 snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid);
115
116 input->name = name;
117 input->phys = button->phys;
118 input->id.bustype = BUS_HOST;
119 input->dev.parent = &device->dev;
120
121 input->evbit[0] = BIT_MASK(EV_SW);
122 set_bit(SW_TABLET_MODE, input->swbit);
123
124 error = input_register_device(input);
125 if (error)
126 goto err_free_input;
127
128 ebook_send_state(device);
129
130 if (device->wakeup.flags.valid) {
131 /* Button's GPE is run-wake GPE */
132 acpi_enable_gpe(device->wakeup.gpe_device,
133 device->wakeup.gpe_number);
134 device_set_wakeup_enable(&device->dev, true);
135 }
136
137 return 0;
138
139 err_free_input:
140 input_free_device(input);
141 err_free_button:
142 kfree(button);
143 return error;
144}
145
146static void ebook_switch_remove(struct acpi_device *device)
147{
148 struct ebook_switch *button = acpi_driver_data(device);
149
150 input_unregister_device(button->input);
151 kfree(button);
152}
153
154static struct acpi_driver xo15_ebook_driver = {
155 .name = MODULE_NAME,
156 .class = XO15_EBOOK_CLASS,
157 .ids = ebook_device_ids,
158 .ops = {
159 .add = ebook_switch_add,
160 .remove = ebook_switch_remove,
161 .notify = ebook_switch_notify,
162 },
163 .drv.pm = &ebook_switch_pm,
164};
165module_acpi_driver(xo15_ebook_driver);