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Linux/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 == NULL)
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                 .owner = THIS_MODULE,
181                 .pm = &nvec_mouse_pm_ops,
182         },
183 };
184 
185 module_platform_driver(nvec_mouse_driver);
186 
187 MODULE_DESCRIPTION("NVEC mouse driver");
188 MODULE_AUTHOR("Marc Dietrich <marvin24@gmx.de>");
189 MODULE_ALIAS("platform:nvec-mouse");
190 MODULE_LICENSE("GPL");
191 

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