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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 | /********************************************************************* * * Filename: litelink.c * Version: 1.1 * Description: Driver for the Parallax LiteLink dongle * Status: Stable * Author: Dag Brattli <dagb@cs.uit.no> * Created at: Fri May 7 12:50:33 1999 * Modified at: Fri Dec 17 09:14:23 1999 * Modified by: Dag Brattli <dagb@cs.uit.no> * * Copyright (c) 1999 Dag Brattli, All Rights Reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA * ********************************************************************/ #include <linux/module.h> #include <linux/delay.h> #include <linux/tty.h> #include <linux/sched.h> #include <linux/init.h> #include <net/irda/irda.h> #include <net/irda/irmod.h> #include <net/irda/irda_device.h> #define MIN_DELAY 25 /* 15 us, but wait a little more to be sure */ #define MAX_DELAY 10000 /* 1 ms */ static void litelink_open(dongle_t *self, struct qos_info *qos); static void litelink_close(dongle_t *self); static int litelink_change_speed(struct irda_task *task); static int litelink_reset(struct irda_task *task); /* These are the baudrates supported */ static __u32 baud_rates[] = { 115200, 57600, 38400, 19200, 9600 }; static struct dongle_reg dongle = { Q_NULL, IRDA_LITELINK_DONGLE, litelink_open, litelink_close, litelink_reset, litelink_change_speed, }; int __init litelink_init(void) { return irda_device_register_dongle(&dongle); } void litelink_cleanup(void) { irda_device_unregister_dongle(&dongle); } static void litelink_open(dongle_t *self, struct qos_info *qos) { qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200; qos->min_turn_time.bits = 0x7f; /* Needs 0.01 ms */ MOD_INC_USE_COUNT; } static void litelink_close(dongle_t *self) { /* Power off dongle */ self->set_dtr_rts(self->dev, FALSE, FALSE); MOD_DEC_USE_COUNT; } /* * Function litelink_change_speed (task) * * Change speed of the Litelink dongle. To cycle through the available * baud rates, pulse RTS low for a few ms. */ static int litelink_change_speed(struct irda_task *task) { dongle_t *self = (dongle_t *) task->instance; __u32 speed = (__u32) task->param; int i; /* Clear RTS to reset dongle */ self->set_dtr_rts(self->dev, TRUE, FALSE); /* Sleep a minimum of 15 us */ udelay(MIN_DELAY); /* Go back to normal mode */ self->set_dtr_rts(self->dev, TRUE, TRUE); /* Sleep a minimum of 15 us */ udelay(MIN_DELAY); /* Cycle through avaiable baudrates until we reach the correct one */ for (i=0; i<5 && baud_rates[i] != speed; i++) { /* Set DTR, clear RTS */ self->set_dtr_rts(self->dev, FALSE, TRUE); /* Sleep a minimum of 15 us */ udelay(MIN_DELAY); /* Set DTR, Set RTS */ self->set_dtr_rts(self->dev, TRUE, TRUE); /* Sleep a minimum of 15 us */ udelay(MIN_DELAY); } irda_task_next_state(task, IRDA_TASK_DONE); return 0; } /* * Function litelink_reset (task) * * Reset the Litelink type dongle. * */ static int litelink_reset(struct irda_task *task) { dongle_t *self = (dongle_t *) task->instance; /* Power on dongle */ self->set_dtr_rts(self->dev, TRUE, TRUE); /* Sleep a minimum of 15 us */ udelay(MIN_DELAY); /* Clear RTS to reset dongle */ self->set_dtr_rts(self->dev, TRUE, FALSE); /* Sleep a minimum of 15 us */ udelay(MIN_DELAY); /* Go back to normal mode */ self->set_dtr_rts(self->dev, TRUE, TRUE); /* Sleep a minimum of 15 us */ udelay(MIN_DELAY); /* This dongles speed defaults to 115200 bps */ self->speed = 115200; irda_task_next_state(task, IRDA_TASK_DONE); return 0; } #ifdef MODULE MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>"); MODULE_DESCRIPTION("Parallax Litelink dongle driver"); MODULE_LICENSE("GPL"); /* * Function init_module (void) * * Initialize Litelink module * */ int init_module(void) { return litelink_init(); } /* * Function cleanup_module (void) * * Cleanup Litelink module * */ void cleanup_module(void) { litelink_cleanup(); } #endif /* MODULE */ |