// SPDX-License-Identifier: GPL-2.0
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/*
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* nvec_ps2: mouse driver for a NVIDIA compliant embedded controller
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*
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* Copyright (C) 2011 The AC100 Kernel Team <ac100@lists.launchpad.net>
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*
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* Authors: Pierre-Hugues Husson <phhusson@free.fr>
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* Ilya Petrov <ilya.muromec@gmail.com>
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* Marc Dietrich <marvin24@gmx.de>
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/serio.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include "nvec.h"
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#define PACKET_SIZE 6
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#define ENABLE_MOUSE 0xf4
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#define DISABLE_MOUSE 0xf5
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#define PSMOUSE_RST 0xff
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#ifdef NVEC_PS2_DEBUG
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#define NVEC_PHD(str, buf, len) \
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print_hex_dump(KERN_DEBUG, str, DUMP_PREFIX_NONE, \
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16, 1, buf, len, false)
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#else
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#define NVEC_PHD(str, buf, len)
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#endif
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enum ps2_subcmds {
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SEND_COMMAND = 1,
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RECEIVE_N,
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AUTO_RECEIVE_N,
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CANCEL_AUTO_RECEIVE,
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};
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struct nvec_ps2 {
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struct serio *ser_dev;
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struct notifier_block notifier;
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struct nvec_chip *nvec;
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};
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static struct nvec_ps2 ps2_dev;
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static int ps2_startstreaming(struct serio *ser_dev)
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{
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unsigned char buf[] = { NVEC_PS2, AUTO_RECEIVE_N, PACKET_SIZE };
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return nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
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}
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static void ps2_stopstreaming(struct serio *ser_dev)
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{
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unsigned char buf[] = { NVEC_PS2, CANCEL_AUTO_RECEIVE };
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nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
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}
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static int ps2_sendcommand(struct serio *ser_dev, unsigned char cmd)
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{
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unsigned char buf[] = { NVEC_PS2, SEND_COMMAND, ENABLE_MOUSE, 1 };
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buf[2] = cmd & 0xff;
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dev_dbg(&ser_dev->dev, "Sending ps2 cmd %02x\n", cmd);
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return nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
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}
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static int nvec_ps2_notifier(struct notifier_block *nb,
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unsigned long event_type, void *data)
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{
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int i;
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unsigned char *msg = data;
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switch (event_type) {
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case NVEC_PS2_EVT:
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for (i = 0; i < msg[1]; i++)
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serio_interrupt(ps2_dev.ser_dev, msg[2 + i], 0);
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NVEC_PHD("ps/2 mouse event: ", &msg[2], msg[1]);
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return NOTIFY_STOP;
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case NVEC_PS2:
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if (msg[2] == 1) {
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for (i = 0; i < (msg[1] - 2); i++)
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serio_interrupt(ps2_dev.ser_dev, msg[i + 4], 0);
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NVEC_PHD("ps/2 mouse reply: ", &msg[4], msg[1] - 2);
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}
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else if (msg[1] != 2) /* !ack */
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NVEC_PHD("unhandled mouse event: ", msg, msg[1] + 2);
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return NOTIFY_STOP;
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}
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return NOTIFY_DONE;
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}
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static int nvec_mouse_probe(struct platform_device *pdev)
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{
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struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
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struct serio *ser_dev;
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ser_dev = kzalloc(sizeof(*ser_dev), GFP_KERNEL);
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if (!ser_dev)
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return -ENOMEM;
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ser_dev->id.type = SERIO_8042;
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ser_dev->write = ps2_sendcommand;
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ser_dev->start = ps2_startstreaming;
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ser_dev->stop = ps2_stopstreaming;
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strlcpy(ser_dev->name, "nvec mouse", sizeof(ser_dev->name));
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strlcpy(ser_dev->phys, "nvec", sizeof(ser_dev->phys));
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ps2_dev.ser_dev = ser_dev;
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ps2_dev.notifier.notifier_call = nvec_ps2_notifier;
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ps2_dev.nvec = nvec;
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nvec_register_notifier(nvec, &ps2_dev.notifier, 0);
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serio_register_port(ser_dev);
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return 0;
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}
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static int nvec_mouse_remove(struct platform_device *pdev)
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{
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struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
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ps2_sendcommand(ps2_dev.ser_dev, DISABLE_MOUSE);
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ps2_stopstreaming(ps2_dev.ser_dev);
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nvec_unregister_notifier(nvec, &ps2_dev.notifier);
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serio_unregister_port(ps2_dev.ser_dev);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int nvec_mouse_suspend(struct device *dev)
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{
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/* disable mouse */
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ps2_sendcommand(ps2_dev.ser_dev, DISABLE_MOUSE);
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/* send cancel autoreceive */
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ps2_stopstreaming(ps2_dev.ser_dev);
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return 0;
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}
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static int nvec_mouse_resume(struct device *dev)
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{
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/* start streaming */
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ps2_startstreaming(ps2_dev.ser_dev);
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/* enable mouse */
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ps2_sendcommand(ps2_dev.ser_dev, ENABLE_MOUSE);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(nvec_mouse_pm_ops, nvec_mouse_suspend,
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nvec_mouse_resume);
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static struct platform_driver nvec_mouse_driver = {
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.probe = nvec_mouse_probe,
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.remove = nvec_mouse_remove,
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.driver = {
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.name = "nvec-mouse",
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.pm = &nvec_mouse_pm_ops,
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},
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};
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module_platform_driver(nvec_mouse_driver);
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MODULE_DESCRIPTION("NVEC mouse driver");
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MODULE_AUTHOR("Marc Dietrich <marvin24@gmx.de>");
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MODULE_ALIAS("platform:nvec-mouse");
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MODULE_LICENSE("GPL");
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