1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
|
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2021 Mark Kettenis <kettenis@openbsd.org>
*/
#include <common.h>
#include <dm.h>
#include <keyboard.h>
#include <spi.h>
#include <stdio_dev.h>
#include <asm-generic/gpio.h>
#include <linux/delay.h>
#include <linux/input.h>
/*
* The Apple SPI keyboard controller implements a protocol that
* closely resembles HID Keyboard Boot protocol. The key codes are
* mapped according to the HID Keyboard/Keypad Usage Table.
*/
/* Modifier key bits */
#define HID_MOD_LEFTCTRL BIT(0)
#define HID_MOD_LEFTSHIFT BIT(1)
#define HID_MOD_LEFTALT BIT(2)
#define HID_MOD_LEFTGUI BIT(3)
#define HID_MOD_RIGHTCTRL BIT(4)
#define HID_MOD_RIGHTSHIFT BIT(5)
#define HID_MOD_RIGHTALT BIT(6)
#define HID_MOD_RIGHTGUI BIT(7)
static const u8 hid_kbd_keymap[] = {
KEY_RESERVED, 0xff, 0xff, 0xff,
KEY_A, KEY_B, KEY_C, KEY_D,
KEY_E, KEY_F, KEY_G, KEY_H,
KEY_I, KEY_J, KEY_K, KEY_L,
KEY_M, KEY_N, KEY_O, KEY_P,
KEY_Q, KEY_R, KEY_S, KEY_T,
KEY_U, KEY_V, KEY_W, KEY_X,
KEY_Y, KEY_Z, KEY_1, KEY_2,
KEY_3, KEY_4, KEY_5, KEY_6,
KEY_7, KEY_8, KEY_9, KEY_0,
KEY_ENTER, KEY_ESC, KEY_BACKSPACE, KEY_TAB,
KEY_SPACE, KEY_MINUS, KEY_EQUAL, KEY_LEFTBRACE,
KEY_RIGHTBRACE, KEY_BACKSLASH, 0xff, KEY_SEMICOLON,
KEY_APOSTROPHE, KEY_GRAVE, KEY_COMMA, KEY_DOT,
KEY_SLASH, KEY_CAPSLOCK, KEY_F1, KEY_F2,
KEY_F3, KEY_F4, KEY_F5, KEY_F6,
KEY_F7, KEY_F8, KEY_F9, KEY_F10,
KEY_F11, KEY_F12, KEY_SYSRQ, KEY_SCROLLLOCK,
KEY_PAUSE, KEY_INSERT, KEY_HOME, KEY_PAGEUP,
KEY_DELETE, KEY_END, KEY_PAGEDOWN, KEY_RIGHT,
KEY_LEFT, KEY_DOWN, KEY_UP, KEY_NUMLOCK,
KEY_KPSLASH, KEY_KPASTERISK, KEY_KPMINUS, KEY_KPPLUS,
KEY_KPENTER, KEY_KP1, KEY_KP2, KEY_KP3,
KEY_KP4, KEY_KP5, KEY_KP6, KEY_KP7,
KEY_KP8, KEY_KP9, KEY_KP0, KEY_KPDOT,
KEY_BACKSLASH, KEY_COMPOSE, KEY_POWER, KEY_KPEQUAL,
};
/* Report ID used for keyboard input reports. */
#define KBD_REPORTID 0x01
struct apple_spi_kbd_report {
u8 reportid;
u8 modifiers;
u8 reserved;
u8 keycode[6];
u8 fn;
};
struct apple_spi_kbd_priv {
struct gpio_desc enable;
struct apple_spi_kbd_report old; /* previous keyboard input report */
struct apple_spi_kbd_report new; /* current keyboard input report */
};
/* Keyboard device. */
#define KBD_DEVICE 0x01
/* The controller sends us fixed-size packets of 256 bytes. */
struct apple_spi_kbd_packet {
u8 flags;
#define PACKET_READ 0x20
u8 device;
u16 offset;
u16 remaining;
u16 len;
u8 data[246];
u16 crc;
};
/* Packets contain a single variable-sized message. */
struct apple_spi_kbd_msg {
u8 type;
#define MSG_REPORT 0x10
u8 device;
u8 unknown;
u8 msgid;
u16 rsplen;
u16 cmdlen;
u8 data[0];
};
static void apple_spi_kbd_service_modifiers(struct input_config *input)
{
struct apple_spi_kbd_priv *priv = dev_get_priv(input->dev);
u8 new = priv->new.modifiers;
u8 old = priv->old.modifiers;
if ((new ^ old) & HID_MOD_LEFTCTRL)
input_add_keycode(input, KEY_LEFTCTRL,
old & HID_MOD_LEFTCTRL);
if ((new ^ old) & HID_MOD_RIGHTCTRL)
input_add_keycode(input, KEY_RIGHTCTRL,
old & HID_MOD_RIGHTCTRL);
if ((new ^ old) & HID_MOD_LEFTSHIFT)
input_add_keycode(input, KEY_LEFTSHIFT,
old & HID_MOD_LEFTSHIFT);
if ((new ^ old) & HID_MOD_RIGHTSHIFT)
input_add_keycode(input, KEY_RIGHTSHIFT,
old & HID_MOD_RIGHTSHIFT);
if ((new ^ old) & HID_MOD_LEFTALT)
input_add_keycode(input, KEY_LEFTALT,
old & HID_MOD_LEFTALT);
if ((new ^ old) & HID_MOD_RIGHTALT)
input_add_keycode(input, KEY_RIGHTALT,
old & HID_MOD_RIGHTALT);
if ((new ^ old) & HID_MOD_LEFTGUI)
input_add_keycode(input, KEY_LEFTMETA,
old & HID_MOD_LEFTGUI);
if ((new ^ old) & HID_MOD_RIGHTGUI)
input_add_keycode(input, KEY_RIGHTMETA,
old & HID_MOD_RIGHTGUI);
}
static void apple_spi_kbd_service_key(struct input_config *input, int i,
int released)
{
struct apple_spi_kbd_priv *priv = dev_get_priv(input->dev);
u8 *new;
u8 *old;
if (released) {
new = priv->new.keycode;
old = priv->old.keycode;
} else {
new = priv->old.keycode;
old = priv->new.keycode;
}
if (memscan(new, old[i], sizeof(priv->new.keycode)) ==
new + sizeof(priv->new.keycode) &&
old[i] < ARRAY_SIZE(hid_kbd_keymap))
input_add_keycode(input, hid_kbd_keymap[old[i]], released);
}
static int apple_spi_kbd_check(struct input_config *input)
{
struct udevice *dev = input->dev;
struct apple_spi_kbd_priv *priv = dev_get_priv(dev);
struct apple_spi_kbd_packet packet;
struct apple_spi_kbd_msg *msg;
struct apple_spi_kbd_report *report;
int i, ret;
memset(&packet, 0, sizeof(packet));
ret = dm_spi_claim_bus(dev);
if (ret < 0)
return ret;
/*
* The keyboard controller needs delays after asserting CS#
* and before deasserting CS#.
*/
ret = dm_spi_xfer(dev, 0, NULL, NULL, SPI_XFER_BEGIN);
if (ret < 0)
goto fail;
udelay(100);
ret = dm_spi_xfer(dev, sizeof(packet) * 8, NULL, &packet, 0);
if (ret < 0)
goto fail;
udelay(100);
ret = dm_spi_xfer(dev, 0, NULL, NULL, SPI_XFER_END);
if (ret < 0)
goto fail;
dm_spi_release_bus(dev);
/*
* The keyboard controller needs a delay between subsequent
* SPI transfers.
*/
udelay(250);
msg = (struct apple_spi_kbd_msg *)packet.data;
report = (struct apple_spi_kbd_report *)msg->data;
if (packet.flags == PACKET_READ && packet.device == KBD_DEVICE &&
msg->type == MSG_REPORT && msg->device == KBD_DEVICE &&
msg->cmdlen == sizeof(struct apple_spi_kbd_report) &&
report->reportid == KBD_REPORTID) {
memcpy(&priv->new, report,
sizeof(struct apple_spi_kbd_report));
apple_spi_kbd_service_modifiers(input);
for (i = 0; i < sizeof(priv->new.keycode); i++) {
apple_spi_kbd_service_key(input, i, 1);
apple_spi_kbd_service_key(input, i, 0);
}
memcpy(&priv->old, &priv->new,
sizeof(struct apple_spi_kbd_report));
return 1;
}
return 0;
fail:
/*
* Make sure CS# is deasserted. If this fails there is nothing
* we can do, so ignore any errors.
*/
dm_spi_xfer(dev, 0, NULL, NULL, SPI_XFER_END);
dm_spi_release_bus(dev);
return ret;
}
static int apple_spi_kbd_probe(struct udevice *dev)
{
struct apple_spi_kbd_priv *priv = dev_get_priv(dev);
struct keyboard_priv *uc_priv = dev_get_uclass_priv(dev);
struct stdio_dev *sdev = &uc_priv->sdev;
struct input_config *input = &uc_priv->input;
int ret;
ret = gpio_request_by_name(dev, "spien-gpios", 0, &priv->enable,
GPIOD_IS_OUT);
if (ret < 0)
return ret;
/* Reset the keyboard controller. */
dm_gpio_set_value(&priv->enable, 1);
udelay(5000);
dm_gpio_set_value(&priv->enable, 0);
udelay(5000);
/* Enable the keyboard controller. */
dm_gpio_set_value(&priv->enable, 1);
input->dev = dev;
input->read_keys = apple_spi_kbd_check;
input_add_tables(input, false);
strcpy(sdev->name, "spikbd");
return input_stdio_register(sdev);
}
static const struct keyboard_ops apple_spi_kbd_ops = {
};
static const struct udevice_id apple_spi_kbd_of_match[] = {
{ .compatible = "apple,spi-hid-transport" },
{ /* sentinel */ }
};
U_BOOT_DRIVER(apple_spi_kbd) = {
.name = "apple_spi_kbd",
.id = UCLASS_KEYBOARD,
.of_match = apple_spi_kbd_of_match,
.probe = apple_spi_kbd_probe,
.priv_auto = sizeof(struct apple_spi_kbd_priv),
.ops = &apple_spi_kbd_ops,
};
|
