1/* 2 * $Id: iforce-serio.c,v 1.1.1.1 2007/08/03 18:52:33 Exp $ 3 * 4 * Copyright (c) 2000-2001 Vojtech Pavlik <vojtech@ucw.cz> 5 * Copyright (c) 2001, 2007 Johann Deneux <johann.deneux@gmail.com> 6 * 7 * USB/RS232 I-Force joysticks and wheels. 8 */ 9 10/* 11 * This program is free software; 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 "iforce.h" 31 32void iforce_serial_xmit(struct iforce *iforce) 33{ 34 unsigned char cs; 35 int i; 36 unsigned long flags; 37 38 if (test_and_set_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags)) { 39 set_bit(IFORCE_XMIT_AGAIN, iforce->xmit_flags); 40 return; 41 } 42 43 spin_lock_irqsave(&iforce->xmit_lock, flags); 44 45again: 46 if (iforce->xmit.head == iforce->xmit.tail) { 47 clear_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags); 48 spin_unlock_irqrestore(&iforce->xmit_lock, flags); 49 return; 50 } 51 52 cs = 0x2b; 53 54 serio_write(iforce->serio, 0x2b); 55 56 serio_write(iforce->serio, iforce->xmit.buf[iforce->xmit.tail]); 57 cs ^= iforce->xmit.buf[iforce->xmit.tail]; 58 XMIT_INC(iforce->xmit.tail, 1); 59 60 for (i=iforce->xmit.buf[iforce->xmit.tail]; i >= 0; --i) { 61 serio_write(iforce->serio, iforce->xmit.buf[iforce->xmit.tail]); 62 cs ^= iforce->xmit.buf[iforce->xmit.tail]; 63 XMIT_INC(iforce->xmit.tail, 1); 64 } 65 66 serio_write(iforce->serio, cs); 67 68 if (test_and_clear_bit(IFORCE_XMIT_AGAIN, iforce->xmit_flags)) 69 goto again; 70 71 clear_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags); 72 73 spin_unlock_irqrestore(&iforce->xmit_lock, flags); 74} 75 76static void iforce_serio_write_wakeup(struct serio *serio) 77{ 78 struct iforce *iforce = serio_get_drvdata(serio); 79 80 iforce_serial_xmit(iforce); 81} 82 83static irqreturn_t iforce_serio_irq(struct serio *serio, 84 unsigned char data, unsigned int flags) 85{ 86 struct iforce *iforce = serio_get_drvdata(serio); 87 88 if (!iforce->pkt) { 89 if (data == 0x2b) 90 iforce->pkt = 1; 91 goto out; 92 } 93 94 if (!iforce->id) { 95 if (data > 3 && data != 0xff) 96 iforce->pkt = 0; 97 else 98 iforce->id = data; 99 goto out; 100 } 101 102 if (!iforce->len) { 103 if (data > IFORCE_MAX_LENGTH) { 104 iforce->pkt = 0; 105 iforce->id = 0; 106 } else { 107 iforce->len = data; 108 } 109 goto out; 110 } 111 112 if (iforce->idx < iforce->len) { 113 iforce->csum += iforce->data[iforce->idx++] = data; 114 goto out; 115 } 116 117 if (iforce->idx == iforce->len) { 118 iforce_process_packet(iforce, (iforce->id << 8) | iforce->idx, iforce->data); 119 iforce->pkt = 0; 120 iforce->id = 0; 121 iforce->len = 0; 122 iforce->idx = 0; 123 iforce->csum = 0; 124 } 125out: 126 return IRQ_HANDLED; 127} 128 129static int iforce_serio_connect(struct serio *serio, struct serio_driver *drv) 130{ 131 struct iforce *iforce; 132 int err; 133 134 iforce = kzalloc(sizeof(struct iforce), GFP_KERNEL); 135 if (!iforce) 136 return -ENOMEM; 137 138 iforce->bus = IFORCE_232; 139 iforce->serio = serio; 140 141 serio_set_drvdata(serio, iforce); 142 143 err = serio_open(serio, drv); 144 if (err) 145 goto fail1; 146 147 err = iforce_init_device(iforce); 148 if (err) 149 goto fail2; 150 151 return 0; 152 153 fail2: serio_close(serio); 154 fail1: serio_set_drvdata(serio, NULL); 155 kfree(iforce); 156 return err; 157} 158 159static void iforce_serio_disconnect(struct serio *serio) 160{ 161 struct iforce *iforce = serio_get_drvdata(serio); 162 163 input_unregister_device(iforce->dev); 164 serio_close(serio); 165 serio_set_drvdata(serio, NULL); 166 kfree(iforce); 167} 168 169static struct serio_device_id iforce_serio_ids[] = { 170 { 171 .type = SERIO_RS232, 172 .proto = SERIO_IFORCE, 173 .id = SERIO_ANY, 174 .extra = SERIO_ANY, 175 }, 176 { 0 } 177}; 178 179MODULE_DEVICE_TABLE(serio, iforce_serio_ids); 180 181struct serio_driver iforce_serio_drv = { 182 .driver = { 183 .name = "iforce", 184 }, 185 .description = "RS232 I-Force joysticks and wheels driver", 186 .id_table = iforce_serio_ids, 187 .write_wakeup = iforce_serio_write_wakeup, 188 .interrupt = iforce_serio_irq, 189 .connect = iforce_serio_connect, 190 .disconnect = iforce_serio_disconnect, 191}; 192