/********************************************************************* * * Filename: girbil.c * Version: 1.2 * Description: Implementation for the Greenwich GIrBIL dongle * Status: Experimental. * Author: Dag Brattli * Created at: Sat Feb 6 21:02:33 1999 * Modified at: Sat Oct 30 20:25:22 1999 * Modified by: Dag Brattli * * 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. * * Neither Dag Brattli nor University of Tromsų admit liability nor * provide warranty for any of this software. This material is * provided "AS-IS" and at no charge. * ********************************************************************/ #include #include #include #include #include #include #include #include #include static int girbil_reset(struct irda_task *task); static void girbil_open(dongle_t *self, struct qos_info *qos); static void girbil_close(dongle_t *self); static int girbil_change_speed(struct irda_task *task); /* Control register 1 */ #define GIRBIL_TXEN 0x01 /* Enable transmitter */ #define GIRBIL_RXEN 0x02 /* Enable receiver */ #define GIRBIL_ECAN 0x04 /* Cancel self emmited data */ #define GIRBIL_ECHO 0x08 /* Echo control characters */ /* LED Current Register (0x2) */ #define GIRBIL_HIGH 0x20 #define GIRBIL_MEDIUM 0x21 #define GIRBIL_LOW 0x22 /* Baud register (0x3) */ #define GIRBIL_2400 0x30 #define GIRBIL_4800 0x31 #define GIRBIL_9600 0x32 #define GIRBIL_19200 0x33 #define GIRBIL_38400 0x34 #define GIRBIL_57600 0x35 #define GIRBIL_115200 0x36 /* Mode register (0x4) */ #define GIRBIL_IRDA 0x40 #define GIRBIL_ASK 0x41 /* Control register 2 (0x5) */ #define GIRBIL_LOAD 0x51 /* Load the new baud rate value */ static struct dongle_reg dongle = { Q_NULL, IRDA_GIRBIL_DONGLE, girbil_open, girbil_close, girbil_reset, girbil_change_speed, }; int __init girbil_init(void) { return irda_device_register_dongle(&dongle); } void girbil_cleanup(void) { irda_device_unregister_dongle(&dongle); } static void girbil_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 &= 0x03; MOD_INC_USE_COUNT; } static void girbil_close(dongle_t *self) { /* Power off dongle */ self->set_dtr_rts(self->dev, FALSE, FALSE); MOD_DEC_USE_COUNT; } /* * Function girbil_change_speed (dev, speed) * * Set the speed for the Girbil type dongle. * */ static int girbil_change_speed(struct irda_task *task) { dongle_t *self = (dongle_t *) task->instance; __u32 speed = (__u32) task->param; __u8 control[2]; int ret = 0; switch (task->state) { case IRDA_TASK_INIT: /* Lock dongle */ if (irda_lock((void *) &self->busy) == FALSE) { IRDA_DEBUG(0, __FUNCTION__ "(), busy!\n"); return MSECS_TO_JIFFIES(100); } /* Need to reset the dongle and go to 9600 bps before programming */ if (irda_task_execute(self, girbil_reset, NULL, task, (void *) speed)) { /* Dongle need more time to reset */ irda_task_next_state(task, IRDA_TASK_CHILD_WAIT); /* Give reset 1 sec to finish */ ret = MSECS_TO_JIFFIES(1000); } break; case IRDA_TASK_CHILD_WAIT: WARNING(__FUNCTION__ "(), resetting dongle timed out!\n"); ret = -1; break; case IRDA_TASK_CHILD_DONE: /* Set DTR and Clear RTS to enter command mode */ self->set_dtr_rts(self->dev, FALSE, TRUE); switch (speed) { case 9600: default: control[0] = GIRBIL_9600; break; case 19200: control[0] = GIRBIL_19200; break; case 34800: control[0] = GIRBIL_38400; break; case 57600: control[0] = GIRBIL_57600; break; case 115200: control[0] = GIRBIL_115200; break; } control[1] = GIRBIL_LOAD; /* Write control bytes */ self->write(self->dev, control, 2); irda_task_next_state(task, IRDA_TASK_WAIT); ret = MSECS_TO_JIFFIES(100); break; case IRDA_TASK_WAIT: /* Go back to normal mode */ self->set_dtr_rts(self->dev, TRUE, TRUE); irda_task_next_state(task, IRDA_TASK_DONE); self->busy = 0; break; default: ERROR(__FUNCTION__ "(), unknown state %d\n", task->state); irda_task_next_state(task, IRDA_TASK_DONE); self->busy = 0; ret = -1; break; } return ret; } /* * Function girbil_reset (driver) * * This function resets the girbil dongle. * * Algorithm: * 0. set RTS, and wait at least 5 ms * 1. clear RTS */ static int girbil_reset(struct irda_task *task) { dongle_t *self = (dongle_t *) task->instance; __u8 control = GIRBIL_TXEN | GIRBIL_RXEN; int ret = 0; switch (task->state) { case IRDA_TASK_INIT: /* Reset dongle */ self->set_dtr_rts(self->dev, TRUE, FALSE); irda_task_next_state(task, IRDA_TASK_WAIT1); /* Sleep at least 5 ms */ ret = MSECS_TO_JIFFIES(10); break; case IRDA_TASK_WAIT1: /* Set DTR and clear RTS to enter command mode */ self->set_dtr_rts(self->dev, FALSE, TRUE); irda_task_next_state(task, IRDA_TASK_WAIT2); ret = MSECS_TO_JIFFIES(10); break; case IRDA_TASK_WAIT2: /* Write control byte */ self->write(self->dev, &control, 1); irda_task_next_state(task, IRDA_TASK_WAIT3); ret = MSECS_TO_JIFFIES(20); break; case IRDA_TASK_WAIT3: /* Go back to normal mode */ self->set_dtr_rts(self->dev, TRUE, TRUE); irda_task_next_state(task, IRDA_TASK_DONE); break; default: ERROR(__FUNCTION__ "(), unknown state %d\n", task->state); irda_task_next_state(task, IRDA_TASK_DONE); ret = -1; break; } return ret; } #ifdef MODULE MODULE_AUTHOR("Dag Brattli "); MODULE_DESCRIPTION("Greenwich GIrBIL dongle driver"); /* * Function init_module (void) * * Initialize Girbil module * */ int init_module(void) { return girbil_init(); } /* * Function cleanup_module (void) * * Cleanup Girbil module * */ void cleanup_module(void) { girbil_cleanup(); } #endif /* MODULE */