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Linux/drivers/input/joystick/stinger.c

  1 /*
  2  *  Copyright (c) 2000-2001 Vojtech Pavlik
  3  *  Copyright (c) 2000 Mark Fletcher
  4  */
  5 
  6 /*
  7  * Gravis Stinger gamepad driver for Linux
  8  */
  9 
 10 /*
 11  * This program is free warftware; you can redistribute it and/or modify
 12  * it under the terms of the GNU General Public License as published by
 13  * the Free Software Foundation; either version 2 of the License, or
 14  * (at your option) any later version.
 15  *
 16  * This program is distributed in the hope that it will be useful,
 17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 19  * GNU General Public License for more details.
 20  *
 21  * You should have received a copy of the GNU General Public License
 22  * along with this program; if not, write to the Free Software
 23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 24  *
 25  *  Should you need to contact me, the author, you can do so either by
 26  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
 27  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
 28  */
 29 
 30 #include <linux/kernel.h>
 31 #include <linux/module.h>
 32 #include <linux/slab.h>
 33 #include <linux/input.h>
 34 #include <linux/serio.h>
 35 
 36 #define DRIVER_DESC     "Gravis Stinger gamepad driver"
 37 
 38 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
 39 MODULE_DESCRIPTION(DRIVER_DESC);
 40 MODULE_LICENSE("GPL");
 41 
 42 /*
 43  * Constants.
 44  */
 45 
 46 #define STINGER_MAX_LENGTH 8
 47 
 48 /*
 49  * Per-Stinger data.
 50  */
 51 
 52 struct stinger {
 53         struct input_dev *dev;
 54         int idx;
 55         unsigned char data[STINGER_MAX_LENGTH];
 56         char phys[32];
 57 };
 58 
 59 /*
 60  * stinger_process_packet() decodes packets the driver receives from the
 61  * Stinger. It updates the data accordingly.
 62  */
 63 
 64 static void stinger_process_packet(struct stinger *stinger)
 65 {
 66         struct input_dev *dev = stinger->dev;
 67         unsigned char *data = stinger->data;
 68 
 69         if (!stinger->idx) return;
 70 
 71         input_report_key(dev, BTN_A,      ((data[0] & 0x20) >> 5));
 72         input_report_key(dev, BTN_B,      ((data[0] & 0x10) >> 4));
 73         input_report_key(dev, BTN_C,      ((data[0] & 0x08) >> 3));
 74         input_report_key(dev, BTN_X,      ((data[0] & 0x04) >> 2));
 75         input_report_key(dev, BTN_Y,      ((data[3] & 0x20) >> 5));
 76         input_report_key(dev, BTN_Z,      ((data[3] & 0x10) >> 4));
 77         input_report_key(dev, BTN_TL,     ((data[3] & 0x08) >> 3));
 78         input_report_key(dev, BTN_TR,     ((data[3] & 0x04) >> 2));
 79         input_report_key(dev, BTN_SELECT, ((data[3] & 0x02) >> 1));
 80         input_report_key(dev, BTN_START,   (data[3] & 0x01));
 81 
 82         input_report_abs(dev, ABS_X, (data[1] & 0x3F) - ((data[0] & 0x01) << 6));
 83         input_report_abs(dev, ABS_Y, ((data[0] & 0x02) << 5) - (data[2] & 0x3F));
 84 
 85         input_sync(dev);
 86 
 87         return;
 88 }
 89 
 90 /*
 91  * stinger_interrupt() is called by the low level driver when characters
 92  * are ready for us. We then buffer them for further processing, or call the
 93  * packet processing routine.
 94  */
 95 
 96 static irqreturn_t stinger_interrupt(struct serio *serio,
 97         unsigned char data, unsigned int flags)
 98 {
 99         struct stinger *stinger = serio_get_drvdata(serio);
100 
101         /* All Stinger packets are 4 bytes */
102 
103         if (stinger->idx < STINGER_MAX_LENGTH)
104                 stinger->data[stinger->idx++] = data;
105 
106         if (stinger->idx == 4) {
107                 stinger_process_packet(stinger);
108                 stinger->idx = 0;
109         }
110 
111         return IRQ_HANDLED;
112 }
113 
114 /*
115  * stinger_disconnect() is the opposite of stinger_connect()
116  */
117 
118 static void stinger_disconnect(struct serio *serio)
119 {
120         struct stinger *stinger = serio_get_drvdata(serio);
121 
122         serio_close(serio);
123         serio_set_drvdata(serio, NULL);
124         input_unregister_device(stinger->dev);
125         kfree(stinger);
126 }
127 
128 /*
129  * stinger_connect() is the routine that is called when someone adds a
130  * new serio device that supports Stinger protocol and registers it as
131  * an input device.
132  */
133 
134 static int stinger_connect(struct serio *serio, struct serio_driver *drv)
135 {
136         struct stinger *stinger;
137         struct input_dev *input_dev;
138         int err = -ENOMEM;
139 
140         stinger = kmalloc(sizeof(struct stinger), GFP_KERNEL);
141         input_dev = input_allocate_device();
142         if (!stinger || !input_dev)
143                 goto fail1;
144 
145         stinger->dev = input_dev;
146         snprintf(stinger->phys, sizeof(stinger->phys), "%s/serio0", serio->phys);
147 
148         input_dev->name = "Gravis Stinger";
149         input_dev->phys = stinger->phys;
150         input_dev->id.bustype = BUS_RS232;
151         input_dev->id.vendor = SERIO_STINGER;
152         input_dev->id.product = 0x0001;
153         input_dev->id.version = 0x0100;
154         input_dev->dev.parent = &serio->dev;
155 
156         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
157         input_dev->keybit[BIT_WORD(BTN_A)] = BIT_MASK(BTN_A) | BIT_MASK(BTN_B) |
158                 BIT_MASK(BTN_C) | BIT_MASK(BTN_X) | BIT_MASK(BTN_Y) |
159                 BIT_MASK(BTN_Z) | BIT_MASK(BTN_TL) | BIT_MASK(BTN_TR) |
160                 BIT_MASK(BTN_START) | BIT_MASK(BTN_SELECT);
161         input_set_abs_params(input_dev, ABS_X, -64, 64, 0, 4);
162         input_set_abs_params(input_dev, ABS_Y, -64, 64, 0, 4);
163 
164         serio_set_drvdata(serio, stinger);
165 
166         err = serio_open(serio, drv);
167         if (err)
168                 goto fail2;
169 
170         err = input_register_device(stinger->dev);
171         if (err)
172                 goto fail3;
173 
174         return 0;
175 
176  fail3: serio_close(serio);
177  fail2: serio_set_drvdata(serio, NULL);
178  fail1: input_free_device(input_dev);
179         kfree(stinger);
180         return err;
181 }
182 
183 /*
184  * The serio driver structure.
185  */
186 
187 static struct serio_device_id stinger_serio_ids[] = {
188         {
189                 .type   = SERIO_RS232,
190                 .proto  = SERIO_STINGER,
191                 .id     = SERIO_ANY,
192                 .extra  = SERIO_ANY,
193         },
194         { 0 }
195 };
196 
197 MODULE_DEVICE_TABLE(serio, stinger_serio_ids);
198 
199 static struct serio_driver stinger_drv = {
200         .driver         = {
201                 .name   = "stinger",
202         },
203         .description    = DRIVER_DESC,
204         .id_table       = stinger_serio_ids,
205         .interrupt      = stinger_interrupt,
206         .connect        = stinger_connect,
207         .disconnect     = stinger_disconnect,
208 };
209 
210 module_serio_driver(stinger_drv);
211 

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