drivers/staging/nvec/nvec_ps2.c

   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 START_STREAMING {'\x06', '\x03', '\x04'}
  25 #define STOP_STREAMING  {'\x06', '\x04'}
  26 #define SEND_COMMAND    {'\x06', '\x01', '\xf4', '\x01'}
  27
  28 static const unsigned char MOUSE_RESET[] = {'\x06', '\x01', '\xff', '\x03'};
  29
  30 struct nvec_ps2 {
  31         struct serio *ser_dev;
  32         struct notifier_block notifier;
  33         struct nvec_chip *nvec;
  34 };
  35
  36 static struct nvec_ps2 ps2_dev;
  37
  38 static int ps2_startstreaming(struct serio *ser_dev)
  39 {
  40         unsigned char buf[] = START_STREAMING;
  41         return nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
  42 }
  43
  44 static void ps2_stopstreaming(struct serio *ser_dev)
  45 {
  46         unsigned char buf[] = STOP_STREAMING;
  47         nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
  48 }
  49
  50 static int ps2_sendcommand(struct serio *ser_dev, unsigned char cmd)
  51 {
  52         unsigned char buf[] = SEND_COMMAND;
  53
  54         buf[2] = cmd & 0xff;
  55
  56         dev_dbg(&ser_dev->dev, "Sending ps2 cmd %02x\n", cmd);
  57         return nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
  58 }
  59
  60 static int nvec_ps2_notifier(struct notifier_block *nb,
  61                              unsigned long event_type, void *data)
  62 {
  63         int i;
  64         unsigned char *msg = (unsigned char *)data;
  65
  66         switch (event_type) {
  67         case NVEC_PS2_EVT:
  68                 for (i = 0; i < msg[1]; i++)
  69                         serio_interrupt(ps2_dev.ser_dev, msg[2 + i], 0);
  70                 return NOTIFY_STOP;
  71
  72         case NVEC_PS2:
  73                 if (msg[2] == 1)
  74                         for (i = 0; i < (msg[1] - 2); i++)
  75                                 serio_interrupt(ps2_dev.ser_dev, msg[i + 4], 0);
  76                 else if (msg[1] != 2) { /* !ack */
  77                         print_hex_dump(KERN_WARNING, "unhandled mouse event: ",
  78                                 DUMP_PREFIX_NONE, 16, 1,
  79                                 msg, msg[1] + 2, true);
  80                 }
  81
  82                 return NOTIFY_STOP;
  83         }
  84
  85         return NOTIFY_DONE;
  86 }
  87
  88 static int __devinit nvec_mouse_probe(struct platform_device *pdev)
  89 {
  90         struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
  91         struct serio *ser_dev = kzalloc(sizeof(struct serio), GFP_KERNEL);
  92
  93         ser_dev->id.type = SERIO_8042;
  94         ser_dev->write = ps2_sendcommand;
  95         ser_dev->open = ps2_startstreaming;
  96         ser_dev->close = ps2_stopstreaming;
  97
  98         strlcpy(ser_dev->name, "nvec mouse", sizeof(ser_dev->name));
  99         strlcpy(ser_dev->phys, "nvec", sizeof(ser_dev->phys));
 100
 101         ps2_dev.ser_dev = ser_dev;
 102         ps2_dev.notifier.notifier_call = nvec_ps2_notifier;
 103         ps2_dev.nvec = nvec;
 104         nvec_register_notifier(nvec, &ps2_dev.notifier, 0);
 105
 106         serio_register_port(ser_dev);
 107
 108         /* mouse reset */
 109         nvec_write_async(nvec, MOUSE_RESET, 4);
 110
 111         return 0;
 112 }
 113
 114 static struct platform_driver nvec_mouse_driver = {
 115         .probe  = nvec_mouse_probe,
 116         .driver = {
 117                 .name = "nvec-mouse",
 118                 .owner = THIS_MODULE,
 119         },
 120 };
 121
 122 static int __init nvec_mouse_init(void)
 123 {
 124         return platform_driver_register(&nvec_mouse_driver);
 125 }
 126
 127 module_init(nvec_mouse_init);
 128
 129 MODULE_DESCRIPTION("NVEC mouse driver");
 130 MODULE_AUTHOR("Marc Dietrich <marvin24@gmx.de>");
 131 MODULE_LICENSE("GPL");