nvec_ps2.c

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