241 lines
6.2 KiB
C
241 lines
6.2 KiB
C
/*********************************************************************
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*
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*
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* Filename: mcp2120.c
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* Version: 1.0
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* Description: Implementation for the MCP2120 (Microchip)
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* Status: Experimental.
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* Author: Felix Tang (tangf@eyetap.org)
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* Created at: Sun Mar 31 19:32:12 EST 2002
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* Based on code by: Dag Brattli <dagb@cs.uit.no>
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*
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* Copyright (c) 2002 Felix Tang, All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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********************************************************************/
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/tty.h>
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#include <linux/init.h>
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#include <net/irda/irda.h>
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#include <net/irda/irda_device.h>
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static int mcp2120_reset(struct irda_task *task);
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static void mcp2120_open(dongle_t *self, struct qos_info *qos);
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static void mcp2120_close(dongle_t *self);
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static int mcp2120_change_speed(struct irda_task *task);
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#define MCP2120_9600 0x87
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#define MCP2120_19200 0x8B
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#define MCP2120_38400 0x85
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#define MCP2120_57600 0x83
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#define MCP2120_115200 0x81
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#define MCP2120_COMMIT 0x11
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static struct dongle_reg dongle = {
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.type = IRDA_MCP2120_DONGLE,
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.open = mcp2120_open,
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.close = mcp2120_close,
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.reset = mcp2120_reset,
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.change_speed = mcp2120_change_speed,
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.owner = THIS_MODULE,
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};
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static int __init mcp2120_init(void)
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{
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return irda_device_register_dongle(&dongle);
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}
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static void __exit mcp2120_cleanup(void)
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{
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irda_device_unregister_dongle(&dongle);
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}
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static void mcp2120_open(dongle_t *self, struct qos_info *qos)
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{
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qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
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qos->min_turn_time.bits = 0x01;
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}
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static void mcp2120_close(dongle_t *self)
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{
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/* Power off dongle */
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/* reset and inhibit mcp2120 */
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self->set_dtr_rts(self->dev, TRUE, TRUE);
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//self->set_dtr_rts(self->dev, FALSE, FALSE);
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}
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/*
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* Function mcp2120_change_speed (dev, speed)
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*
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* Set the speed for the MCP2120.
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*
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*/
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static int mcp2120_change_speed(struct irda_task *task)
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{
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dongle_t *self = (dongle_t *) task->instance;
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__u32 speed = (__u32) task->param;
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__u8 control[2];
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int ret = 0;
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self->speed_task = task;
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switch (task->state) {
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case IRDA_TASK_INIT:
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/* Need to reset the dongle and go to 9600 bps before
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programming */
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//printk("Dmcp2120_change_speed irda_task_init\n");
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if (irda_task_execute(self, mcp2120_reset, NULL, task,
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(void *) speed))
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{
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/* Dongle need more time to reset */
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irda_task_next_state(task, IRDA_TASK_CHILD_WAIT);
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/* Give reset 1 sec to finish */
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ret = msecs_to_jiffies(1000);
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}
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break;
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case IRDA_TASK_CHILD_WAIT:
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IRDA_WARNING("%s(), resetting dongle timed out!\n",
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__FUNCTION__);
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ret = -1;
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break;
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case IRDA_TASK_CHILD_DONE:
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/* Set DTR to enter command mode */
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self->set_dtr_rts(self->dev, TRUE, FALSE);
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udelay(500);
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switch (speed) {
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case 9600:
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default:
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control[0] = MCP2120_9600;
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//printk("mcp2120 9600\n");
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break;
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case 19200:
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control[0] = MCP2120_19200;
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//printk("mcp2120 19200\n");
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break;
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case 34800:
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control[0] = MCP2120_38400;
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//printk("mcp2120 38400\n");
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break;
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case 57600:
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control[0] = MCP2120_57600;
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//printk("mcp2120 57600\n");
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break;
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case 115200:
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control[0] = MCP2120_115200;
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//printk("mcp2120 115200\n");
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break;
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}
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control[1] = MCP2120_COMMIT;
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/* Write control bytes */
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self->write(self->dev, control, 2);
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irda_task_next_state(task, IRDA_TASK_WAIT);
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ret = msecs_to_jiffies(100);
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//printk("mcp2120_change_speed irda_child_done\n");
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break;
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case IRDA_TASK_WAIT:
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/* Go back to normal mode */
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self->set_dtr_rts(self->dev, FALSE, FALSE);
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irda_task_next_state(task, IRDA_TASK_DONE);
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self->speed_task = NULL;
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//printk("mcp2120_change_speed irda_task_wait\n");
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break;
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default:
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IRDA_ERROR("%s(), unknown state %d\n",
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__FUNCTION__, task->state);
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irda_task_next_state(task, IRDA_TASK_DONE);
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self->speed_task = NULL;
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ret = -1;
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break;
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}
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return ret;
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}
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/*
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* Function mcp2120_reset (driver)
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*
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* This function resets the mcp2120 dongle.
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*
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* Info: -set RTS to reset mcp2120
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* -set DTR to set mcp2120 software command mode
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* -mcp2120 defaults to 9600 baud after reset
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*
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* Algorithm:
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* 0. Set RTS to reset mcp2120.
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* 1. Clear RTS and wait for device reset timer of 30 ms (max).
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*
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*/
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static int mcp2120_reset(struct irda_task *task)
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{
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dongle_t *self = (dongle_t *) task->instance;
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int ret = 0;
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self->reset_task = task;
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switch (task->state) {
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case IRDA_TASK_INIT:
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//printk("mcp2120_reset irda_task_init\n");
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/* Reset dongle by setting RTS*/
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self->set_dtr_rts(self->dev, TRUE, TRUE);
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irda_task_next_state(task, IRDA_TASK_WAIT1);
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ret = msecs_to_jiffies(50);
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break;
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case IRDA_TASK_WAIT1:
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//printk("mcp2120_reset irda_task_wait1\n");
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/* clear RTS and wait for at least 30 ms. */
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self->set_dtr_rts(self->dev, FALSE, FALSE);
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irda_task_next_state(task, IRDA_TASK_WAIT2);
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ret = msecs_to_jiffies(50);
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break;
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case IRDA_TASK_WAIT2:
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//printk("mcp2120_reset irda_task_wait2\n");
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/* Go back to normal mode */
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self->set_dtr_rts(self->dev, FALSE, FALSE);
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irda_task_next_state(task, IRDA_TASK_DONE);
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self->reset_task = NULL;
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break;
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default:
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IRDA_ERROR("%s(), unknown state %d\n",
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__FUNCTION__, task->state);
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irda_task_next_state(task, IRDA_TASK_DONE);
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self->reset_task = NULL;
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ret = -1;
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break;
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}
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return ret;
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}
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MODULE_AUTHOR("Felix Tang <tangf@eyetap.org>");
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MODULE_DESCRIPTION("Microchip MCP2120");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("irda-dongle-9"); /* IRDA_MCP2120_DONGLE */
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/*
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* Function init_module (void)
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*
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* Initialize MCP2120 module
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*
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*/
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module_init(mcp2120_init);
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/*
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* Function cleanup_module (void)
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*
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* Cleanup MCP2120 module
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*
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*/
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module_exit(mcp2120_cleanup);
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