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) do { } while (0)
  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 nvec_ps2_notifier(struct notifier_block *nb,
  64                              unsigned long event_type, void *data)
  65 {
  66         int i;
  67         unsigned char *msg = data;
  68
  69         switch (event_type) {
  70         case NVEC_PS2_EVT:
  71                 for (i = 0; i < msg[1]; i++)
  72                         serio_interrupt(ps2_dev.ser_dev, msg[2 + i], 0);
  73                 NVEC_PHD("ps/2 mouse event: ", &msg[2], msg[1]);
  74                 return NOTIFY_STOP;
  75
  76         case NVEC_PS2:
  77                 if (msg[2] == 1) {
  78                         for (i = 0; i < (msg[1] - 2); i++)
  79                                 serio_interrupt(ps2_dev.ser_dev, msg[i + 4], 0);
  80                         NVEC_PHD("ps/2 mouse reply: ", &msg[4], msg[1] - 2);
  81                 }
  82
  83                 else if (msg[1] != 2) /* !ack */
  84                         NVEC_PHD("unhandled mouse event: ", msg, msg[1] + 2);
  85                 return NOTIFY_STOP;
  86         }
  87
  88         return NOTIFY_DONE;
  89 }
  90
  91 static int ps2_sendcommand(struct serio *ser_dev, unsigned char cmd)
  92 {
  93         unsigned char buf[] = { NVEC_PS2, SEND_COMMAND, ENABLE_MOUSE, 1 };
  94         struct nvec_msg *msg;
  95         int ret;
  96
  97         buf[2] = cmd & 0xff;
  98
  99         dev_dbg(&ser_dev->dev, "Sending ps2 cmd %02x\n", cmd);
 100
 101         ret = nvec_write_sync(ps2_dev.nvec, buf, sizeof(buf), &msg);
 102         if (ret < 0)
 103                 return ret;
 104
 105         nvec_ps2_notifier(NULL, NVEC_PS2, msg->data);
 106
 107         nvec_msg_free(ps2_dev.nvec, msg);
 108
 109         return 0;
 110 }
 111
 112 static int nvec_mouse_probe(struct platform_device *pdev)
 113 {
 114         struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
 115         struct serio *ser_dev;
 116
 117         ser_dev = kzalloc(sizeof(*ser_dev), GFP_KERNEL);
 118         if (!ser_dev)
 119                 return -ENOMEM;
 120
 121         ser_dev->id.type = SERIO_8042;
 122         ser_dev->write = ps2_sendcommand;
 123         ser_dev->start = ps2_startstreaming;
 124         ser_dev->stop = ps2_stopstreaming;
 125
 126         strscpy(ser_dev->name, "nvec mouse", sizeof(ser_dev->name));
 127         strscpy(ser_dev->phys, "nvec", sizeof(ser_dev->phys));
 128
 129         ps2_dev.ser_dev = ser_dev;
 130         ps2_dev.notifier.notifier_call = nvec_ps2_notifier;
 131         ps2_dev.nvec = nvec;
 132         nvec_register_notifier(nvec, &ps2_dev.notifier, 0);
 133
 134         serio_register_port(ser_dev);
 135
 136         return 0;
 137 }
 138
 139 static void nvec_mouse_remove(struct platform_device *pdev)
 140 {
 141         struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
 142
 143         ps2_sendcommand(ps2_dev.ser_dev, DISABLE_MOUSE);
 144         ps2_stopstreaming(ps2_dev.ser_dev);
 145         nvec_unregister_notifier(nvec, &ps2_dev.notifier);
 146         serio_unregister_port(ps2_dev.ser_dev);
 147 }
 148
 149 #ifdef CONFIG_PM_SLEEP
 150 static int nvec_mouse_suspend(struct device *dev)
 151 {
 152         /* disable mouse */
 153         ps2_sendcommand(ps2_dev.ser_dev, DISABLE_MOUSE);
 154
 155         /* send cancel autoreceive */
 156         ps2_stopstreaming(ps2_dev.ser_dev);
 157
 158         return 0;
 159 }
 160
 161 static int nvec_mouse_resume(struct device *dev)
 162 {
 163         /* start streaming */
 164         ps2_startstreaming(ps2_dev.ser_dev);
 165
 166         /* enable mouse */
 167         ps2_sendcommand(ps2_dev.ser_dev, ENABLE_MOUSE);
 168
 169         return 0;
 170 }
 171 #endif
 172
 173 static SIMPLE_DEV_PM_OPS(nvec_mouse_pm_ops, nvec_mouse_suspend,
 174                          nvec_mouse_resume);
 175
 176 static struct platform_driver nvec_mouse_driver = {
 177         .probe  = nvec_mouse_probe,
 178         .remove_new = nvec_mouse_remove,
 179         .driver = {
 180                 .name = "nvec-mouse",
 181                 .pm = &nvec_mouse_pm_ops,
 182         },
 183 };
 184
 185 module_platform_driver(nvec_mouse_driver);
 186
 187 MODULE_DESCRIPTION("NVEC mouse driver");
 188 MODULE_AUTHOR("Marc Dietrich <[email protected]>");
 189 MODULE_ALIAS("platform:nvec-mouse");
 190 MODULE_LICENSE("GPL");