LXR linux/drivers/staging/nvec/nvec

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