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', '\x06'}
  25 #define STOP_STREAMING  {'\x06', '\x04'}
  26 #define SEND_COMMAND    {'\x06', '\x01', '\xf4', '\x01'}
  27
  28 #ifdef NVEC_PS2_DEBUG
  29 #define NVEC_PHD(str, buf, len) \
  30         print_hex_dump(KERN_DEBUG, str, DUMP_PREFIX_NONE, \
  31                         16, 1, buf, len, false)
  32 #else
  33 #define NVEC_PHD(str, buf, len)
  34 #endif
  35
  36 static const unsigned char MOUSE_RESET[] = {'\x06', '\x01', '\xff', '\x03'};
  37
  38 struct nvec_ps2 {
  39         struct serio *ser_dev;
  40         struct notifier_block notifier;
  41         struct nvec_chip *nvec;
  42 };
  43
  44 static struct nvec_ps2 ps2_dev;
  45
  46 static int ps2_startstreaming(struct serio *ser_dev)
  47 {
  48         unsigned char buf[] = START_STREAMING;
  49         return nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
  50 }
  51
  52 static void ps2_stopstreaming(struct serio *ser_dev)
  53 {
  54         unsigned char buf[] = STOP_STREAMING;
  55         nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
  56 }
  57
  58 static int ps2_sendcommand(struct serio *ser_dev, unsigned char cmd)
  59 {
  60         unsigned char buf[] = SEND_COMMAND;
  61
  62         buf[2] = cmd & 0xff;
  63
  64         dev_dbg(&ser_dev->dev, "Sending ps2 cmd %02x\n", cmd);
  65         return nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
  66 }
  67
  68 static int nvec_ps2_notifier(struct notifier_block *nb,
  69                              unsigned long event_type, void *data)
  70 {
  71         int i;
  72         unsigned char *msg = (unsigned char *)data;
  73
  74         switch (event_type) {
  75         case NVEC_PS2_EVT:
  76                 for (i = 0; i < msg[1]; i++)
  77                         serio_interrupt(ps2_dev.ser_dev, msg[2 + i], 0);
  78                 NVEC_PHD("ps/2 mouse event: ", &msg[2], msg[1]);
  79                 return NOTIFY_STOP;
  80
  81         case NVEC_PS2:
  82                 if (msg[2] == 1) {
  83                         for (i = 0; i < (msg[1] - 2); i++)
  84                                 serio_interrupt(ps2_dev.ser_dev, msg[i + 4], 0);
  85                         NVEC_PHD("ps/2 mouse reply: ", &msg[4], msg[1] - 2);
  86                 }
  87
  88                 else if (msg[1] != 2) /* !ack */
  89                         NVEC_PHD("unhandled mouse event: ", msg, msg[1] + 2);
  90                 return NOTIFY_STOP;
  91         }
  92
  93         return NOTIFY_DONE;
  94 }
  95
  96 static int __devinit nvec_mouse_probe(struct platform_device *pdev)
  97 {
  98         struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
  99         struct serio *ser_dev;
 100
 101         ser_dev = devm_kzalloc(&pdev->dev, sizeof(struct serio), GFP_KERNEL);
 102         if (ser_dev == NULL)
 103                 return -ENOMEM;
 104
 105         ser_dev->id.type = SERIO_PS_PSTHRU;
 106         ser_dev->write = ps2_sendcommand;
 107         ser_dev->start = ps2_startstreaming;
 108         ser_dev->stop = ps2_stopstreaming;
 109
 110         strlcpy(ser_dev->name, "nvec mouse", sizeof(ser_dev->name));
 111         strlcpy(ser_dev->phys, "nvec", sizeof(ser_dev->phys));
 112
 113         ps2_dev.ser_dev = ser_dev;
 114         ps2_dev.notifier.notifier_call = nvec_ps2_notifier;
 115         ps2_dev.nvec = nvec;
 116         nvec_register_notifier(nvec, &ps2_dev.notifier, 0);
 117
 118         serio_register_port(ser_dev);
 119
 120         /* mouse reset */
 121         nvec_write_async(nvec, MOUSE_RESET, 4);
 122
 123         return 0;
 124 }
 125
 126 static int __devexit nvec_mouse_remove(struct platform_device *pdev)
 127 {
 128         serio_unregister_port(ps2_dev.ser_dev);
 129
 130         return 0;
 131 }
 132
 133 #ifdef CONFIG_PM_SLEEP
 134 static int nvec_mouse_suspend(struct device *dev)
 135 {
 136         struct platform_device *pdev = to_platform_device(dev);
 137         struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
 138
 139         /* disable mouse */
 140         nvec_write_async(nvec, "\x06\xf4", 2);
 141
 142         /* send cancel autoreceive */
 143         nvec_write_async(nvec, "\x06\x04", 2);
 144
 145         return 0;
 146 }
 147
 148 static int nvec_mouse_resume(struct device *dev)
 149 {
 150         struct platform_device *pdev = to_platform_device(dev);
 151         struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
 152
 153         ps2_startstreaming(ps2_dev.ser_dev);
 154
 155         /* enable mouse */
 156         nvec_write_async(nvec, "\x06\xf5", 2);
 157
 158         return 0;
 159 }
 160 #endif
 161
 162 static const SIMPLE_DEV_PM_OPS(nvec_mouse_pm_ops, nvec_mouse_suspend,
 163                                 nvec_mouse_resume);
 164
 165 static struct platform_driver nvec_mouse_driver = {
 166         .probe  = nvec_mouse_probe,
 167         .remove = __devexit_p(nvec_mouse_remove),
 168         .driver = {
 169                 .name = "nvec-mouse",
 170                 .owner = THIS_MODULE,
 171                 .pm = &nvec_mouse_pm_ops,
 172         },
 173 };
 174
 175 module_platform_driver(nvec_mouse_driver);
 176
 177 MODULE_DESCRIPTION("NVEC mouse driver");
 178 MODULE_AUTHOR("Marc Dietrich <marvin24@gmx.de>");
 179 MODULE_LICENSE("GPL");