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 <[email protected]>
   5  *
   6  * Authors:  Pierre-Hugues Husson <[email protected]>
   7  *           Ilya Petrov <[email protected]>
   8  *           Marc Dietrich <[email protected]>
   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         return nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
  57 }
  58
  59 static 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
  65 static 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
  75 static 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
 103 static 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
 134 static int nvec_mouse_remove(struct platform_device *pdev)
 135 {
 136         struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
 137
 138         ps2_sendcommand(ps2_dev.ser_dev, DISABLE_MOUSE);
 139         ps2_stopstreaming(ps2_dev.ser_dev);
 140         nvec_unregister_notifier(nvec, &ps2_dev.notifier);
 141         serio_unregister_port(ps2_dev.ser_dev);
 142
 143         return 0;
 144 }
 145
 146 #ifdef CONFIG_PM_SLEEP
 147 static int nvec_mouse_suspend(struct device *dev)
 148 {
 149         /* disable mouse */
 150         ps2_sendcommand(ps2_dev.ser_dev, DISABLE_MOUSE);
 151
 152         /* send cancel autoreceive */
 153         ps2_stopstreaming(ps2_dev.ser_dev);
 154
 155         return 0;
 156 }
 157
 158 static int nvec_mouse_resume(struct device *dev)
 159 {
 160         /* start streaming */
 161         ps2_startstreaming(ps2_dev.ser_dev);
 162
 163         /* enable mouse */
 164         ps2_sendcommand(ps2_dev.ser_dev, ENABLE_MOUSE);
 165
 166         return 0;
 167 }
 168 #endif
 169
 170 static const SIMPLE_DEV_PM_OPS(nvec_mouse_pm_ops, nvec_mouse_suspend,
 171                                 nvec_mouse_resume);
 172
 173 static struct platform_driver nvec_mouse_driver = {
 174         .probe  = nvec_mouse_probe,
 175         .remove = nvec_mouse_remove,
 176         .driver = {
 177                 .name = "nvec-mouse",
 178                 .owner = THIS_MODULE,
 179                 .pm = &nvec_mouse_pm_ops,
 180         },
 181 };
 182
 183 module_platform_driver(nvec_mouse_driver);
 184
 185 MODULE_DESCRIPTION("NVEC mouse driver");
 186 MODULE_AUTHOR("Marc Dietrich <[email protected]>");
 187 MODULE_ALIAS("platform:nvec-mouse");
 188 MODULE_LICENSE("GPL");