/********************************************************************* * * * Filename: mcp2120.c * Version: 1.0 * Description: Implementation for the MCP2120 (Microchip) * Status: Experimental. * Author: Felix Tang (tangf@eyetap.org) * Created at: Sun Mar 31 19:32:12 EST 2002 * Based on code by: Dag Brattli * * Copyright (c) 2002 Felix Tang, 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. * ********************************************************************/ #include #include #include #include #include #include #include #include #include static int mcp2120_reset(struct irda_task *task); static void mcp2120_open(dongle_t *self, struct qos_info *qos); static void mcp2120_close(dongle_t *self); static int mcp2120_change_speed(struct irda_task *task); #define MCP2120_9600 0x87 #define MCP2120_19200 0x8B #define MCP2120_38400 0x85 #define MCP2120_57600 0x83 #define MCP2120_115200 0x81 #define MCP2120_COMMIT 0x11 static struct dongle_reg dongle = { Q_NULL, IRDA_MCP2120_DONGLE, mcp2120_open, mcp2120_close, mcp2120_reset, mcp2120_change_speed, }; int __init mcp2120_init(void) { return irda_device_register_dongle(&dongle); } void mcp2120_cleanup(void) { irda_device_unregister_dongle(&dongle); } static void mcp2120_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 = 0x01; MOD_INC_USE_COUNT; } static void mcp2120_close(dongle_t *self) { /* Power off dongle */ /* reset and inhibit mcp2120 */ self->set_dtr_rts(self->dev, TRUE, TRUE); //self->set_dtr_rts(self->dev, FALSE, FALSE); MOD_DEC_USE_COUNT; } /* * Function mcp2120_change_speed (dev, speed) * * Set the speed for the MCP2120. * */ static int mcp2120_change_speed(struct irda_task *task) { dongle_t *self = (dongle_t *) task->instance; __u32 speed = (__u32) task->param; __u8 control[2]; int ret = 0; self->speed_task = task; switch (task->state) { case IRDA_TASK_INIT: /* Need to reset the dongle and go to 9600 bps before programming */ //printk("Dmcp2120_change_speed irda_task_init\n"); if (irda_task_execute(self, mcp2120_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("%s(), resetting dongle timed out!\n", __FUNCTION__); ret = -1; break; case IRDA_TASK_CHILD_DONE: /* Set DTR to enter command mode */ self->set_dtr_rts(self->dev, TRUE, FALSE); udelay(500); switch (speed) { case 9600: default: control[0] = MCP2120_9600; //printk("mcp2120 9600\n"); break; case 19200: control[0] = MCP2120_19200; //printk("mcp2120 19200\n"); break; case 34800: control[0] = MCP2120_38400; //printk("mcp2120 38400\n"); break; case 57600: control[0] = MCP2120_57600; //printk("mcp2120 57600\n"); break; case 115200: control[0] = MCP2120_115200; //printk("mcp2120 115200\n"); break; } control[1] = MCP2120_COMMIT; /* Write control bytes */ self->write(self->dev, control, 2); irda_task_next_state(task, IRDA_TASK_WAIT); ret = MSECS_TO_JIFFIES(100); //printk("mcp2120_change_speed irda_child_done\n"); break; case IRDA_TASK_WAIT: /* Go back to normal mode */ self->set_dtr_rts(self->dev, FALSE, FALSE); irda_task_next_state(task, IRDA_TASK_DONE); self->speed_task = NULL; //printk("mcp2120_change_speed irda_task_wait\n"); break; default: ERROR("%s(), unknown state %d\n", __FUNCTION__, task->state); irda_task_next_state(task, IRDA_TASK_DONE); self->speed_task = NULL; ret = -1; break; } return ret; } /* * Function mcp2120_reset (driver) * * This function resets the mcp2120 dongle. * * Info: -set RTS to reset mcp2120 * -set DTR to set mcp2120 software command mode * -mcp2120 defaults to 9600 baud after reset * * Algorithm: * 0. Set RTS to reset mcp2120. * 1. Clear RTS and wait for device reset timer of 30 ms (max). * */ static int mcp2120_reset(struct irda_task *task) { dongle_t *self = (dongle_t *) task->instance; int ret = 0; self->reset_task = task; switch (task->state) { case IRDA_TASK_INIT: //printk("mcp2120_reset irda_task_init\n"); /* Reset dongle by setting RTS*/ self->set_dtr_rts(self->dev, TRUE, TRUE); irda_task_next_state(task, IRDA_TASK_WAIT1); ret = MSECS_TO_JIFFIES(50); break; case IRDA_TASK_WAIT1: //printk("mcp2120_reset irda_task_wait1\n"); /* clear RTS and wait for at least 30 ms. */ self->set_dtr_rts(self->dev, FALSE, FALSE); irda_task_next_state(task, IRDA_TASK_WAIT2); ret = MSECS_TO_JIFFIES(50); break; case IRDA_TASK_WAIT2: //printk("mcp2120_reset irda_task_wait2\n"); /* Go back to normal mode */ self->set_dtr_rts(self->dev, FALSE, FALSE); irda_task_next_state(task, IRDA_TASK_DONE); self->reset_task = NULL; break; default: ERROR("%s(), unknown state %d\n", __FUNCTION__ , task->state); irda_task_next_state(task, IRDA_TASK_DONE); self->reset_task = NULL; ret = -1; break; } return ret; } #ifdef MODULE MODULE_AUTHOR("Felix Tang "); MODULE_DESCRIPTION("Microchip MCP2120"); MODULE_LICENSE("GPL"); /* * Function init_module (void) * * Initialize MCP2120 module * */ int init_module(void) { return mcp2120_init(); } /* * Function cleanup_module (void) * * Cleanup MCP2120 module * */ void cleanup_module(void) { mcp2120_cleanup(); } #endif /* MODULE */