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3c2a0909 S |
1 | /* drivers/input/keyreset.c |
2 | * | |
3 | * Copyright (C) 2014 Google, Inc. | |
4 | * | |
5 | * This software is licensed under the terms of the GNU General Public | |
6 | * License version 2, as published by the Free Software Foundation, and | |
7 | * may be copied, distributed, and modified under those terms. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <linux/input.h> | |
17 | #include <linux/keyreset.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/platform_device.h> | |
20 | #include <linux/reboot.h> | |
21 | #include <linux/sched.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/syscalls.h> | |
24 | #include <linux/keycombo.h> | |
25 | ||
26 | struct keyreset_state { | |
27 | int restart_requested; | |
28 | int (*reset_fn)(void); | |
29 | struct platform_device *pdev_child; | |
30 | struct work_struct restart_work; | |
31 | }; | |
32 | ||
33 | static void do_restart(struct work_struct *unused) | |
34 | { | |
35 | sys_sync(); | |
36 | kernel_restart(NULL); | |
37 | } | |
38 | ||
39 | static void do_reset_fn(void *priv) | |
40 | { | |
41 | struct keyreset_state *state = priv; | |
42 | if (state->restart_requested) | |
43 | panic("keyboard reset failed, %d", state->restart_requested); | |
44 | if (state->reset_fn) { | |
45 | state->restart_requested = state->reset_fn(); | |
46 | } else { | |
47 | pr_info("keyboard reset\n"); | |
48 | schedule_work(&state->restart_work); | |
49 | state->restart_requested = 1; | |
50 | } | |
51 | } | |
52 | ||
53 | static int keyreset_probe(struct platform_device *pdev) | |
54 | { | |
55 | int ret = -ENOMEM; | |
56 | struct keycombo_platform_data *pdata_child; | |
57 | struct keyreset_platform_data *pdata = pdev->dev.platform_data; | |
58 | int up_size = 0, down_size = 0, size; | |
59 | int key, *keyp; | |
60 | struct keyreset_state *state; | |
61 | ||
62 | if (!pdata) | |
63 | return -EINVAL; | |
64 | state = devm_kzalloc(&pdev->dev, sizeof(*state), GFP_KERNEL); | |
65 | if (!state) | |
66 | return -ENOMEM; | |
67 | ||
68 | state->pdev_child = platform_device_alloc(KEYCOMBO_NAME, | |
69 | PLATFORM_DEVID_AUTO); | |
70 | if (!state->pdev_child) | |
71 | return -ENOMEM; | |
72 | state->pdev_child->dev.parent = &pdev->dev; | |
73 | INIT_WORK(&state->restart_work, do_restart); | |
74 | ||
75 | keyp = pdata->keys_down; | |
76 | while ((key = *keyp++)) { | |
77 | if (key >= KEY_MAX) | |
78 | continue; | |
79 | down_size++; | |
80 | } | |
81 | if (pdata->keys_up) { | |
82 | keyp = pdata->keys_up; | |
83 | while ((key = *keyp++)) { | |
84 | if (key >= KEY_MAX) | |
85 | continue; | |
86 | up_size++; | |
87 | } | |
88 | } | |
89 | size = sizeof(struct keycombo_platform_data) | |
90 | + sizeof(int) * (down_size + 1); | |
91 | pdata_child = devm_kzalloc(&pdev->dev, size, GFP_KERNEL); | |
92 | if (!pdata_child) | |
93 | goto error; | |
94 | memcpy(pdata_child->keys_down, pdata->keys_down, | |
95 | sizeof(int) * down_size); | |
96 | if (up_size > 0) { | |
97 | pdata_child->keys_up = devm_kzalloc(&pdev->dev, up_size + 1, | |
98 | GFP_KERNEL); | |
99 | if (!pdata_child->keys_up) | |
100 | goto error; | |
101 | memcpy(pdata_child->keys_up, pdata->keys_up, | |
102 | sizeof(int) * up_size); | |
103 | if (!pdata_child->keys_up) | |
104 | goto error; | |
105 | } | |
106 | state->reset_fn = pdata->reset_fn; | |
107 | pdata_child->key_down_fn = do_reset_fn; | |
108 | pdata_child->priv = state; | |
109 | pdata_child->key_down_delay = pdata->key_down_delay; | |
110 | ret = platform_device_add_data(state->pdev_child, pdata_child, size); | |
111 | if (ret) | |
112 | goto error; | |
113 | platform_set_drvdata(pdev, state); | |
114 | return platform_device_add(state->pdev_child); | |
115 | error: | |
116 | platform_device_put(state->pdev_child); | |
117 | return ret; | |
118 | } | |
119 | ||
120 | int keyreset_remove(struct platform_device *pdev) | |
121 | { | |
122 | struct keyreset_state *state = platform_get_drvdata(pdev); | |
123 | platform_device_put(state->pdev_child); | |
124 | return 0; | |
125 | } | |
126 | ||
127 | ||
128 | struct platform_driver keyreset_driver = { | |
129 | .driver.name = KEYRESET_NAME, | |
130 | .probe = keyreset_probe, | |
131 | .remove = keyreset_remove, | |
132 | }; | |
133 | ||
134 | static int __init keyreset_init(void) | |
135 | { | |
136 | return platform_driver_register(&keyreset_driver); | |
137 | } | |
138 | ||
139 | static void __exit keyreset_exit(void) | |
140 | { | |
141 | return platform_driver_unregister(&keyreset_driver); | |
142 | } | |
143 | ||
144 | module_init(keyreset_init); | |
145 | module_exit(keyreset_exit); |