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 PACKET_SIZE 6
25
26 #define ENABLE_MOUSE 0xf4
27 #define DISABLE_MOUSE 0xf5
28 #define PSMOUSE_RST 0xff
29
30 #ifdef NVEC_PS2_DEBUG
31 #define NVEC_PHD(str, buf, len) \
32 print_hex_dump(KERN_DEBUG, str, DUMP_PREFIX_NONE, \
33 16, 1, buf, len, false)
34 #else
35 #define NVEC_PHD(str, buf, len)
36 #endif
37
38 enum ps2_subcmds {
39 SEND_COMMAND = 1,
40 RECEIVE_N,
41 AUTO_RECEIVE_N,
42 CANCEL_AUTO_RECEIVE,
43 };
44
45 struct nvec_ps2 {
46 struct serio *ser_dev;
47 struct notifier_block notifier;
48 struct nvec_chip *nvec;
49 };
50
51 static struct nvec_ps2 ps2_dev;
52
ps2_startstreaming(struct serio * ser_dev)53 static int ps2_startstreaming(struct serio *ser_dev)
54 {
55 unsigned char buf[] = { NVEC_PS2, AUTO_RECEIVE_N, PACKET_SIZE };
56
57 return nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
58 }
59
ps2_stopstreaming(struct serio * ser_dev)60 static void ps2_stopstreaming(struct serio *ser_dev)
61 {
62 unsigned char buf[] = { NVEC_PS2, CANCEL_AUTO_RECEIVE };
63
64 nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
65 }
66
ps2_sendcommand(struct serio * ser_dev,unsigned char cmd)67 static int ps2_sendcommand(struct serio *ser_dev, unsigned char cmd)
68 {
69 unsigned char buf[] = { NVEC_PS2, SEND_COMMAND, ENABLE_MOUSE, 1 };
70
71 buf[2] = cmd & 0xff;
72
73 dev_dbg(&ser_dev->dev, "Sending ps2 cmd %02x\n", cmd);
74 return nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
75 }
76
nvec_ps2_notifier(struct notifier_block * nb,unsigned long event_type,void * data)77 static int nvec_ps2_notifier(struct notifier_block *nb,
78 unsigned long event_type, void *data)
79 {
80 int i;
81 unsigned char *msg = (unsigned char *)data;
82
83 switch (event_type) {
84 case NVEC_PS2_EVT:
85 for (i = 0; i < msg[1]; i++)
86 serio_interrupt(ps2_dev.ser_dev, msg[2 + i], 0);
87 NVEC_PHD("ps/2 mouse event: ", &msg[2], msg[1]);
88 return NOTIFY_STOP;
89
90 case NVEC_PS2:
91 if (msg[2] == 1) {
92 for (i = 0; i < (msg[1] - 2); i++)
93 serio_interrupt(ps2_dev.ser_dev, msg[i + 4], 0);
94 NVEC_PHD("ps/2 mouse reply: ", &msg[4], msg[1] - 2);
95 }
96
97 else if (msg[1] != 2) /* !ack */
98 NVEC_PHD("unhandled mouse event: ", msg, msg[1] + 2);
99 return NOTIFY_STOP;
100 }
101
102 return NOTIFY_DONE;
103 }
104
nvec_mouse_probe(struct platform_device * pdev)105 static int nvec_mouse_probe(struct platform_device *pdev)
106 {
107 struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
108 struct serio *ser_dev;
109
110 ser_dev = kzalloc(sizeof(struct serio), GFP_KERNEL);
111 if (!ser_dev)
112 return -ENOMEM;
113
114 ser_dev->id.type = SERIO_8042;
115 ser_dev->write = ps2_sendcommand;
116 ser_dev->start = ps2_startstreaming;
117 ser_dev->stop = ps2_stopstreaming;
118
119 strlcpy(ser_dev->name, "nvec mouse", sizeof(ser_dev->name));
120 strlcpy(ser_dev->phys, "nvec", sizeof(ser_dev->phys));
121
122 ps2_dev.ser_dev = ser_dev;
123 ps2_dev.notifier.notifier_call = nvec_ps2_notifier;
124 ps2_dev.nvec = nvec;
125 nvec_register_notifier(nvec, &ps2_dev.notifier, 0);
126
127 serio_register_port(ser_dev);
128
129 return 0;
130 }
131
nvec_mouse_remove(struct platform_device * pdev)132 static int nvec_mouse_remove(struct platform_device *pdev)
133 {
134 struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
135
136 ps2_sendcommand(ps2_dev.ser_dev, DISABLE_MOUSE);
137 ps2_stopstreaming(ps2_dev.ser_dev);
138 nvec_unregister_notifier(nvec, &ps2_dev.notifier);
139 serio_unregister_port(ps2_dev.ser_dev);
140
141 return 0;
142 }
143
144 #ifdef CONFIG_PM_SLEEP
nvec_mouse_suspend(struct device * dev)145 static int nvec_mouse_suspend(struct device *dev)
146 {
147 /* disable mouse */
148 ps2_sendcommand(ps2_dev.ser_dev, DISABLE_MOUSE);
149
150 /* send cancel autoreceive */
151 ps2_stopstreaming(ps2_dev.ser_dev);
152
153 return 0;
154 }
155
nvec_mouse_resume(struct device * dev)156 static int nvec_mouse_resume(struct device *dev)
157 {
158 /* start streaming */
159 ps2_startstreaming(ps2_dev.ser_dev);
160
161 /* enable mouse */
162 ps2_sendcommand(ps2_dev.ser_dev, ENABLE_MOUSE);
163
164 return 0;
165 }
166 #endif
167
168 static SIMPLE_DEV_PM_OPS(nvec_mouse_pm_ops, nvec_mouse_suspend,
169 nvec_mouse_resume);
170
171 static struct platform_driver nvec_mouse_driver = {
172 .probe = nvec_mouse_probe,
173 .remove = nvec_mouse_remove,
174 .driver = {
175 .name = "nvec-mouse",
176 .pm = &nvec_mouse_pm_ops,
177 },
178 };
179
180 module_platform_driver(nvec_mouse_driver);
181
182 MODULE_DESCRIPTION("NVEC mouse driver");
183 MODULE_AUTHOR("Marc Dietrich <marvin24@gmx.de>");
184 MODULE_ALIAS("platform:nvec-mouse");
185 MODULE_LICENSE("GPL");
186