source: src/linux/universal/linux-3.18/drivers/staging/nvec/nvec_ps2.c @ 31869

Last change on this file since 31869 was 31869, checked in by brainslayer, 2 months ago

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File size: 4.3 KB
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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
38enum ps2_subcmds {
39        SEND_COMMAND = 1,
40        RECEIVE_N,
41        AUTO_RECEIVE_N,
42        CANCEL_AUTO_RECEIVE,
43};
44
45struct nvec_ps2 {
46        struct serio *ser_dev;
47        struct notifier_block notifier;
48        struct nvec_chip *nvec;
49};
50
51static struct nvec_ps2 ps2_dev;
52
53static 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
60static 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
67static 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
77static 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
105static 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 = devm_kzalloc(&pdev->dev, sizeof(struct serio), GFP_KERNEL);
111        if (ser_dev == NULL)
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
132static 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
145static 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
156static 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
168static const SIMPLE_DEV_PM_OPS(nvec_mouse_pm_ops, nvec_mouse_suspend,
169                                nvec_mouse_resume);
170
171static struct platform_driver nvec_mouse_driver = {
172        .probe  = nvec_mouse_probe,
173        .remove = nvec_mouse_remove,
174        .driver = {
175                .name = "nvec-mouse",
176                .owner = THIS_MODULE,
177                .pm = &nvec_mouse_pm_ops,
178        },
179};
180
181module_platform_driver(nvec_mouse_driver);
182
183MODULE_DESCRIPTION("NVEC mouse driver");
184MODULE_AUTHOR("Marc Dietrich <marvin24@gmx.de>");
185MODULE_ALIAS("platform:nvec-mouse");
186MODULE_LICENSE("GPL");
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