1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * nvec_ps2: mouse 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 * Ilya Petrov <ilya.muromec@gmail.com>
9 * Marc Dietrich <marvin24@gmx.de>
10 */
11
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/serio.h>
15 #include <linux/delay.h>
16 #include <linux/platform_device.h>
17
18 #include "nvec.h"
19
20 #define PACKET_SIZE 6
21
22 #define ENABLE_MOUSE 0xf4
23 #define DISABLE_MOUSE 0xf5
24 #define PSMOUSE_RST 0xff
25
26 #ifdef NVEC_PS2_DEBUG
27 #define NVEC_PHD(str, buf, len) \
28 print_hex_dump(KERN_DEBUG, str, DUMP_PREFIX_NONE, \
29 16, 1, buf, len, false)
30 #else
31 #define NVEC_PHD(str, buf, len) do { } while (0)
32 #endif
33
34 enum ps2_subcmds {
35 SEND_COMMAND = 1,
36 RECEIVE_N,
37 AUTO_RECEIVE_N,
38 CANCEL_AUTO_RECEIVE,
39 };
40
41 struct nvec_ps2 {
42 struct serio *ser_dev;
43 struct notifier_block notifier;
44 struct nvec_chip *nvec;
45 };
46
47 static struct nvec_ps2 ps2_dev;
48
ps2_startstreaming(struct serio * ser_dev)49 static int ps2_startstreaming(struct serio *ser_dev)
50 {
51 unsigned char buf[] = { NVEC_PS2, AUTO_RECEIVE_N, PACKET_SIZE };
52
53 return nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
54 }
55
ps2_stopstreaming(struct serio * ser_dev)56 static void ps2_stopstreaming(struct serio *ser_dev)
57 {
58 unsigned char buf[] = { NVEC_PS2, CANCEL_AUTO_RECEIVE };
59
60 nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
61 }
62
ps2_sendcommand(struct serio * ser_dev,unsigned char cmd)63 static int ps2_sendcommand(struct serio *ser_dev, unsigned char cmd)
64 {
65 unsigned char buf[] = { NVEC_PS2, SEND_COMMAND, ENABLE_MOUSE, 1 };
66
67 buf[2] = cmd & 0xff;
68
69 dev_dbg(&ser_dev->dev, "Sending ps2 cmd %02x\n", cmd);
70 return nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
71 }
72
nvec_ps2_notifier(struct notifier_block * nb,unsigned long event_type,void * data)73 static int nvec_ps2_notifier(struct notifier_block *nb,
74 unsigned long event_type, void *data)
75 {
76 int i;
77 unsigned char *msg = data;
78
79 switch (event_type) {
80 case NVEC_PS2_EVT:
81 for (i = 0; i < msg[1]; i++)
82 serio_interrupt(ps2_dev.ser_dev, msg[2 + i], 0);
83 NVEC_PHD("ps/2 mouse event: ", &msg[2], msg[1]);
84 return NOTIFY_STOP;
85
86 case NVEC_PS2:
87 if (msg[2] == 1) {
88 for (i = 0; i < (msg[1] - 2); i++)
89 serio_interrupt(ps2_dev.ser_dev, msg[i + 4], 0);
90 NVEC_PHD("ps/2 mouse reply: ", &msg[4], msg[1] - 2);
91 }
92
93 else if (msg[1] != 2) /* !ack */
94 NVEC_PHD("unhandled mouse event: ", msg, msg[1] + 2);
95 return NOTIFY_STOP;
96 }
97
98 return NOTIFY_DONE;
99 }
100
nvec_mouse_probe(struct platform_device * pdev)101 static int nvec_mouse_probe(struct platform_device *pdev)
102 {
103 struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
104 struct serio *ser_dev;
105
106 ser_dev = kzalloc(sizeof(*ser_dev), GFP_KERNEL);
107 if (!ser_dev)
108 return -ENOMEM;
109
110 ser_dev->id.type = SERIO_8042;
111 ser_dev->write = ps2_sendcommand;
112 ser_dev->start = ps2_startstreaming;
113 ser_dev->stop = ps2_stopstreaming;
114
115 strscpy(ser_dev->name, "nvec mouse", sizeof(ser_dev->name));
116 strscpy(ser_dev->phys, "nvec", sizeof(ser_dev->phys));
117
118 ps2_dev.ser_dev = ser_dev;
119 ps2_dev.notifier.notifier_call = nvec_ps2_notifier;
120 ps2_dev.nvec = nvec;
121 nvec_register_notifier(nvec, &ps2_dev.notifier, 0);
122
123 serio_register_port(ser_dev);
124
125 return 0;
126 }
127
nvec_mouse_remove(struct platform_device * pdev)128 static void nvec_mouse_remove(struct platform_device *pdev)
129 {
130 struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
131
132 ps2_sendcommand(ps2_dev.ser_dev, DISABLE_MOUSE);
133 ps2_stopstreaming(ps2_dev.ser_dev);
134 nvec_unregister_notifier(nvec, &ps2_dev.notifier);
135 serio_unregister_port(ps2_dev.ser_dev);
136 }
137
138 #ifdef CONFIG_PM_SLEEP
nvec_mouse_suspend(struct device * dev)139 static int nvec_mouse_suspend(struct device *dev)
140 {
141 /* disable mouse */
142 ps2_sendcommand(ps2_dev.ser_dev, DISABLE_MOUSE);
143
144 /* send cancel autoreceive */
145 ps2_stopstreaming(ps2_dev.ser_dev);
146
147 return 0;
148 }
149
nvec_mouse_resume(struct device * dev)150 static int nvec_mouse_resume(struct device *dev)
151 {
152 /* start streaming */
153 ps2_startstreaming(ps2_dev.ser_dev);
154
155 /* enable mouse */
156 ps2_sendcommand(ps2_dev.ser_dev, ENABLE_MOUSE);
157
158 return 0;
159 }
160 #endif
161
162 static SIMPLE_DEV_PM_OPS(nvec_mouse_pm_ops, nvec_mouse_suspend,
163 nvec_mouse_resume);
164
165 static struct platform_driver nvec_mouse_driver = {
166 .probe = nvec_mouse_probe,
167 .remove_new = nvec_mouse_remove,
168 .driver = {
169 .name = "nvec-mouse",
170 .pm = &nvec_mouse_pm_ops,
171 },
172 };
173
174 module_platform_driver(nvec_mouse_driver);
175
176 MODULE_DESCRIPTION("NVEC mouse driver");
177 MODULE_AUTHOR("Marc Dietrich <marvin24@gmx.de>");
178 MODULE_ALIAS("platform:nvec-mouse");
179 MODULE_LICENSE("GPL");
180