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