1 /*
2 * nvec_ps2: mouse driver for a NVIDIA compliant embedded controller
3 *
4 * Copyright (C) 2011 The AC100 Kernel Team <ac100@lists.launchpad.net>
5 *
6 * Authors: Pierre-Hugues Husson <phhusson@free.fr>
7 * Ilya Petrov <ilya.muromec@gmail.com>
8 * Marc Dietrich <marvin24@gmx.de>
9 *
10 * This file is subject to the terms and conditions of the GNU General Public
11 * License. See the file "COPYING" in the main directory of this archive
12 * for more details.
13 *
14 */
15
16 #include <linux/module.h>
17 #include <linux/slab.h>
18 #include <linux/serio.h>
19 #include <linux/delay.h>
20 #include <linux/platform_device.h>
21
22 #include "nvec.h"
23
24 #define START_STREAMING {'\x06', '\x03', '\x04'}
25 #define STOP_STREAMING {'\x06', '\x04'}
26 #define SEND_COMMAND {'\x06', '\x01', '\xf4', '\x01'}
27
28 static const unsigned char MOUSE_RESET[] = {'\x06', '\x01', '\xff', '\x03'};
29
30 struct nvec_ps2 {
31 struct serio *ser_dev;
32 struct notifier_block notifier;
33 struct nvec_chip *nvec;
34 };
35
36 static struct nvec_ps2 ps2_dev;
37
ps2_startstreaming(struct serio * ser_dev)38 static int ps2_startstreaming(struct serio *ser_dev)
39 {
40 unsigned char buf[] = START_STREAMING;
41 return nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
42 }
43
ps2_stopstreaming(struct serio * ser_dev)44 static void ps2_stopstreaming(struct serio *ser_dev)
45 {
46 unsigned char buf[] = STOP_STREAMING;
47 nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
48 }
49
ps2_sendcommand(struct serio * ser_dev,unsigned char cmd)50 static int ps2_sendcommand(struct serio *ser_dev, unsigned char cmd)
51 {
52 unsigned char buf[] = SEND_COMMAND;
53
54 buf[2] = cmd & 0xff;
55
56 dev_dbg(&ser_dev->dev, "Sending ps2 cmd %02x\n", cmd);
57 return nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
58 }
59
nvec_ps2_notifier(struct notifier_block * nb,unsigned long event_type,void * data)60 static int nvec_ps2_notifier(struct notifier_block *nb,
61 unsigned long event_type, void *data)
62 {
63 int i;
64 unsigned char *msg = (unsigned char *)data;
65
66 switch (event_type) {
67 case NVEC_PS2_EVT:
68 for (i = 0; i < msg[1]; i++)
69 serio_interrupt(ps2_dev.ser_dev, msg[2 + i], 0);
70 return NOTIFY_STOP;
71
72 case NVEC_PS2:
73 if (msg[2] == 1)
74 for (i = 0; i < (msg[1] - 2); i++)
75 serio_interrupt(ps2_dev.ser_dev, msg[i + 4], 0);
76 else if (msg[1] != 2) { /* !ack */
77 print_hex_dump(KERN_WARNING, "unhandled mouse event: ",
78 DUMP_PREFIX_NONE, 16, 1,
79 msg, msg[1] + 2, true);
80 }
81
82 return NOTIFY_STOP;
83 }
84
85 return NOTIFY_DONE;
86 }
87
nvec_mouse_probe(struct platform_device * pdev)88 static int __devinit nvec_mouse_probe(struct platform_device *pdev)
89 {
90 struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
91 struct serio *ser_dev = kzalloc(sizeof(struct serio), GFP_KERNEL);
92
93 ser_dev->id.type = SERIO_8042;
94 ser_dev->write = ps2_sendcommand;
95 ser_dev->open = ps2_startstreaming;
96 ser_dev->close = ps2_stopstreaming;
97
98 strlcpy(ser_dev->name, "nvec mouse", sizeof(ser_dev->name));
99 strlcpy(ser_dev->phys, "nvec", sizeof(ser_dev->phys));
100
101 ps2_dev.ser_dev = ser_dev;
102 ps2_dev.notifier.notifier_call = nvec_ps2_notifier;
103 ps2_dev.nvec = nvec;
104 nvec_register_notifier(nvec, &ps2_dev.notifier, 0);
105
106 serio_register_port(ser_dev);
107
108 /* mouse reset */
109 nvec_write_async(nvec, MOUSE_RESET, 4);
110
111 return 0;
112 }
113
114 static struct platform_driver nvec_mouse_driver = {
115 .probe = nvec_mouse_probe,
116 .driver = {
117 .name = "nvec-mouse",
118 .owner = THIS_MODULE,
119 },
120 };
121
nvec_mouse_init(void)122 static int __init nvec_mouse_init(void)
123 {
124 return platform_driver_register(&nvec_mouse_driver);
125 }
126
127 module_init(nvec_mouse_init);
128
129 MODULE_DESCRIPTION("NVEC mouse driver");
130 MODULE_AUTHOR("Marc Dietrich <marvin24@gmx.de>");
131 MODULE_LICENSE("GPL");
132