1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * nvec_kbd: keyboard driver for a NVIDIA compliant embedded controller
4 *
5 * Copyright (C) 2011 The AC100 Kernel Team <ac100@lists.launchpad.net>
6 *
7 * Authors: Pierre-Hugues Husson <phhusson@free.fr>
8 * Marc Dietrich <marvin24@gmx.de>
9 */
10
11 #include <linux/module.h>
12 #include <linux/slab.h>
13 #include <linux/input.h>
14 #include <linux/delay.h>
15 #include <linux/platform_device.h>
16
17 #include "nvec-keytable.h"
18 #include "nvec.h"
19
20 enum kbd_subcmds {
21 CNFG_WAKE = 3,
22 CNFG_WAKE_KEY_REPORTING,
23 SET_LEDS = 0xed,
24 ENABLE_KBD = 0xf4,
25 DISABLE_KBD,
26 };
27
28 static unsigned char keycodes[ARRAY_SIZE(code_tab_102us)
29 + ARRAY_SIZE(extcode_tab_us102)];
30
31 struct nvec_keys {
32 struct input_dev *input;
33 struct notifier_block notifier;
34 struct nvec_chip *nvec;
35 bool caps_lock;
36 };
37
38 static struct nvec_keys keys_dev;
39
nvec_kbd_toggle_led(void)40 static void nvec_kbd_toggle_led(void)
41 {
42 char buf[] = { NVEC_KBD, SET_LEDS, 0 };
43
44 keys_dev.caps_lock = !keys_dev.caps_lock;
45
46 if (keys_dev.caps_lock)
47 /* should be BIT(0) only, firmware bug? */
48 buf[2] = BIT(0) | BIT(1) | BIT(2);
49
50 nvec_write_async(keys_dev.nvec, buf, sizeof(buf));
51 }
52
nvec_keys_notifier(struct notifier_block * nb,unsigned long event_type,void * data)53 static int nvec_keys_notifier(struct notifier_block *nb,
54 unsigned long event_type, void *data)
55 {
56 int code, state;
57 unsigned char *msg = data;
58
59 if (event_type == NVEC_KB_EVT) {
60 int _size = (msg[0] & (3 << 5)) >> 5;
61
62 /* power on/off button */
63 if (_size == NVEC_VAR_SIZE)
64 return NOTIFY_STOP;
65
66 if (_size == NVEC_3BYTES)
67 msg++;
68
69 code = msg[1] & 0x7f;
70 state = msg[1] & 0x80;
71
72 if (code_tabs[_size][code] == KEY_CAPSLOCK && state)
73 nvec_kbd_toggle_led();
74
75 input_report_key(keys_dev.input, code_tabs[_size][code],
76 !state);
77 input_sync(keys_dev.input);
78
79 return NOTIFY_STOP;
80 }
81
82 return NOTIFY_DONE;
83 }
84
nvec_kbd_event(struct input_dev * dev,unsigned int type,unsigned int code,int value)85 static int nvec_kbd_event(struct input_dev *dev, unsigned int type,
86 unsigned int code, int value)
87 {
88 struct nvec_chip *nvec = keys_dev.nvec;
89 char buf[] = { NVEC_KBD, SET_LEDS, 0 };
90
91 if (type == EV_REP)
92 return 0;
93
94 if (type != EV_LED)
95 return -1;
96
97 if (code != LED_CAPSL)
98 return -1;
99
100 buf[2] = !!value;
101 nvec_write_async(nvec, buf, sizeof(buf));
102
103 return 0;
104 }
105
nvec_kbd_probe(struct platform_device * pdev)106 static int nvec_kbd_probe(struct platform_device *pdev)
107 {
108 struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
109 int i, j, err;
110 struct input_dev *idev;
111 char clear_leds[] = { NVEC_KBD, SET_LEDS, 0 },
112 enable_kbd[] = { NVEC_KBD, ENABLE_KBD },
113 cnfg_wake[] = { NVEC_KBD, CNFG_WAKE, true, true },
114 cnfg_wake_key_reporting[] = { NVEC_KBD, CNFG_WAKE_KEY_REPORTING,
115 true };
116
117 j = 0;
118
119 for (i = 0; i < ARRAY_SIZE(code_tab_102us); ++i)
120 keycodes[j++] = code_tab_102us[i];
121
122 for (i = 0; i < ARRAY_SIZE(extcode_tab_us102); ++i)
123 keycodes[j++] = extcode_tab_us102[i];
124
125 idev = devm_input_allocate_device(&pdev->dev);
126 if (!idev)
127 return -ENOMEM;
128 idev->name = "nvec keyboard";
129 idev->phys = "nvec";
130 idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP) | BIT_MASK(EV_LED);
131 idev->ledbit[0] = BIT_MASK(LED_CAPSL);
132 idev->event = nvec_kbd_event;
133 idev->keycode = keycodes;
134 idev->keycodesize = sizeof(unsigned char);
135 idev->keycodemax = ARRAY_SIZE(keycodes);
136
137 for (i = 0; i < ARRAY_SIZE(keycodes); ++i)
138 set_bit(keycodes[i], idev->keybit);
139
140 clear_bit(0, idev->keybit);
141 err = input_register_device(idev);
142 if (err)
143 return err;
144
145 keys_dev.input = idev;
146 keys_dev.notifier.notifier_call = nvec_keys_notifier;
147 keys_dev.nvec = nvec;
148 nvec_register_notifier(nvec, &keys_dev.notifier, 0);
149
150 /* Enable keyboard */
151 nvec_write_async(nvec, enable_kbd, 2);
152
153 /* configures wake on special keys */
154 nvec_write_async(nvec, cnfg_wake, 4);
155 /* enable wake key reporting */
156 nvec_write_async(nvec, cnfg_wake_key_reporting, 3);
157
158 /* Disable caps lock LED */
159 nvec_write_async(nvec, clear_leds, sizeof(clear_leds));
160
161 return 0;
162 }
163
nvec_kbd_remove(struct platform_device * pdev)164 static int nvec_kbd_remove(struct platform_device *pdev)
165 {
166 struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
167 char disable_kbd[] = { NVEC_KBD, DISABLE_KBD },
168 uncnfg_wake_key_reporting[] = { NVEC_KBD, CNFG_WAKE_KEY_REPORTING,
169 false };
170 nvec_write_async(nvec, uncnfg_wake_key_reporting, 3);
171 nvec_write_async(nvec, disable_kbd, 2);
172 nvec_unregister_notifier(nvec, &keys_dev.notifier);
173
174 return 0;
175 }
176
177 static struct platform_driver nvec_kbd_driver = {
178 .probe = nvec_kbd_probe,
179 .remove = nvec_kbd_remove,
180 .driver = {
181 .name = "nvec-kbd",
182 },
183 };
184
185 module_platform_driver(nvec_kbd_driver);
186
187 MODULE_AUTHOR("Marc Dietrich <marvin24@gmx.de>");
188 MODULE_DESCRIPTION("NVEC keyboard driver");
189 MODULE_ALIAS("platform:nvec-kbd");
190 MODULE_LICENSE("GPL");
191