kernel/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 PACKET_SIZE     6
  25
  26 #define ENABLE_MOUSE    0xf4
  27 #define DISABLE_MOUSE   0xf5
  28 #define PSMOUSE_RST     0xff
  29
  30 #ifdef NVEC_PS2_DEBUG
  31 #define NVEC_PHD(str, buf, len) \
  32         print_hex_dump(KERN_DEBUG, str, DUMP_PREFIX_NONE, \
  33                         16, 1, buf, len, false)
  34 #else
  35 #define NVEC_PHD(str, buf, len)
  36 #endif
  37
  38 enum ps2_subcmds {
  39         SEND_COMMAND = 1,
  40         RECEIVE_N,
  41         AUTO_RECEIVE_N,
  42         CANCEL_AUTO_RECEIVE,
  43 };
  44
  45 struct nvec_ps2 {
  46         struct serio *ser_dev;
  47         struct notifier_block notifier;
  48         struct nvec_chip *nvec;
  49 };
  50
  51 static struct nvec_ps2 ps2_dev;
  52
  53 static int ps2_startstreaming(struct serio *ser_dev)
  54 {
  55         unsigned char buf[] = { NVEC_PS2, AUTO_RECEIVE_N, PACKET_SIZE };
  56
  57         return nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
  58 }
  59
  60 static void ps2_stopstreaming(struct serio *ser_dev)
  61 {
  62         unsigned char buf[] = { NVEC_PS2, CANCEL_AUTO_RECEIVE };
  63
  64         nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
  65 }
  66
  67 static int ps2_sendcommand(struct serio *ser_dev, unsigned char cmd)
  68 {
  69         unsigned char buf[] = { NVEC_PS2, SEND_COMMAND, ENABLE_MOUSE, 1 };
  70
  71         buf[2] = cmd & 0xff;
  72
  73         dev_dbg(&ser_dev->dev, "Sending ps2 cmd %02x\n", cmd);
  74         return nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
  75 }
  76
  77 static int nvec_ps2_notifier(struct notifier_block *nb,
  78                              unsigned long event_type, void *data)
  79 {
  80         int i;
  81         unsigned char *msg = (unsigned char *)data;
  82
  83         switch (event_type) {
  84         case NVEC_PS2_EVT:
  85                 for (i = 0; i < msg[1]; i++)
  86                         serio_interrupt(ps2_dev.ser_dev, msg[2 + i], 0);
  87                 NVEC_PHD("ps/2 mouse event: ", &msg[2], msg[1]);
  88                 return NOTIFY_STOP;
  89
  90         case NVEC_PS2:
  91                 if (msg[2] == 1) {
  92                         for (i = 0; i < (msg[1] - 2); i++)
  93                                 serio_interrupt(ps2_dev.ser_dev, msg[i + 4], 0);
  94                         NVEC_PHD("ps/2 mouse reply: ", &msg[4], msg[1] - 2);
  95                 }
  96
  97                 else if (msg[1] != 2) /* !ack */
  98                         NVEC_PHD("unhandled mouse event: ", msg, msg[1] + 2);
  99                 return NOTIFY_STOP;
 100         }
 101
 102         return NOTIFY_DONE;
 103 }
 104
 105 static int nvec_mouse_probe(struct platform_device *pdev)
 106 {
 107         struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
 108         struct serio *ser_dev;
 109         char mouse_reset[] = { NVEC_PS2, SEND_COMMAND, PSMOUSE_RST, 3 };
 110
 111         ser_dev = devm_kzalloc(&pdev->dev, sizeof(struct serio), GFP_KERNEL);
 112         if (!ser_dev)
 113                 return -ENOMEM;
 114
 115         ser_dev->id.type = SERIO_PS_PSTHRU;
 116         ser_dev->write = ps2_sendcommand;
 117         ser_dev->start = ps2_startstreaming;
 118         ser_dev->stop = ps2_stopstreaming;
 119
 120         strlcpy(ser_dev->name, "nvec mouse", sizeof(ser_dev->name));
 121         strlcpy(ser_dev->phys, "nvec", sizeof(ser_dev->phys));
 122
 123         ps2_dev.ser_dev = ser_dev;
 124         ps2_dev.notifier.notifier_call = nvec_ps2_notifier;
 125         ps2_dev.nvec = nvec;
 126         nvec_register_notifier(nvec, &ps2_dev.notifier, 0);
 127
 128         serio_register_port(ser_dev);
 129
 130         /* mouse reset */
 131         nvec_write_async(nvec, mouse_reset, sizeof(mouse_reset));
 132
 133         return 0;
 134 }
 135
 136 static int nvec_mouse_remove(struct platform_device *pdev)
 137 {
 138         struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
 139
 140         ps2_sendcommand(ps2_dev.ser_dev, DISABLE_MOUSE);
 141         ps2_stopstreaming(ps2_dev.ser_dev);
 142         nvec_unregister_notifier(nvec, &ps2_dev.notifier);
 143         serio_unregister_port(ps2_dev.ser_dev);
 144
 145         return 0;
 146 }
 147
 148 #ifdef CONFIG_PM_SLEEP
 149 static int nvec_mouse_suspend(struct device *dev)
 150 {
 151         /* disable mouse */
 152         ps2_sendcommand(ps2_dev.ser_dev, DISABLE_MOUSE);
 153
 154         /* send cancel autoreceive */
 155         ps2_stopstreaming(ps2_dev.ser_dev);
 156
 157         return 0;
 158 }
 159
 160 static int nvec_mouse_resume(struct device *dev)
 161 {
 162         /* start streaming */
 163         ps2_startstreaming(ps2_dev.ser_dev);
 164
 165         /* enable mouse */
 166         ps2_sendcommand(ps2_dev.ser_dev, ENABLE_MOUSE);
 167
 168         return 0;
 169 }
 170 #endif
 171
 172 static const SIMPLE_DEV_PM_OPS(nvec_mouse_pm_ops, nvec_mouse_suspend,
 173                                 nvec_mouse_resume);
 174
 175 static struct platform_driver nvec_mouse_driver = {
 176         .probe  = nvec_mouse_probe,
 177         .remove = nvec_mouse_remove,
 178         .driver = {
 179                 .name = "nvec-mouse",
 180                 .pm = &nvec_mouse_pm_ops,
 181         },
 182 };
 183
 184 module_platform_driver(nvec_mouse_driver);
 185
 186 MODULE_DESCRIPTION("NVEC mouse driver");
 187 MODULE_AUTHOR("Marc Dietrich <marvin24@gmx.de>");
 188 MODULE_ALIAS("platform:nvec-mouse");
 189 MODULE_LICENSE("GPL");