/********************************************************************* * * * 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 <dagb@cs.uit.no> * * 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 <linux/module.h> #include <linux/delay.h> #include <linux/init.h> #include <net/irda/irda.h> #include "sir-dev.h" static int mcp2120_reset(struct sir_dev *dev); static int mcp2120_open(struct sir_dev *dev); static int mcp2120_close(struct sir_dev *dev); static int mcp2120_change_speed(struct sir_dev *dev, unsigned speed); #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_driver mcp2120 = { .owner = THIS_MODULE, .driver_name = "Microchip MCP2120", .type = IRDA_MCP2120_DONGLE, .open = mcp2120_open, .close = mcp2120_close, .reset = mcp2120_reset, .set_speed = mcp2120_change_speed, }; static int __init mcp2120_sir_init(void) { return irda_register_dongle(&mcp2120); } static void __exit mcp2120_sir_cleanup(void) { irda_unregister_dongle(&mcp2120); } static int mcp2120_open(struct sir_dev *dev) { struct qos_info *qos = &dev->qos; IRDA_DEBUG(2, "%s()\n", __FUNCTION__); /* seems no explicit power-on required here and reset switching it on anyway */ qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200; qos->min_turn_time.bits = 0x01; irda_qos_bits_to_value(qos); return 0; } static int mcp2120_close(struct sir_dev *dev) { IRDA_DEBUG(2, "%s()\n", __FUNCTION__); /* Power off dongle */ /* reset and inhibit mcp2120 */ sirdev_set_dtr_rts(dev, TRUE, TRUE); // sirdev_set_dtr_rts(dev, FALSE, FALSE); return 0; } /* * Function mcp2120_change_speed (dev, speed) * * Set the speed for the MCP2120. * */ #define MCP2120_STATE_WAIT_SPEED (SIRDEV_STATE_DONGLE_SPEED+1) static int mcp2120_change_speed(struct sir_dev *dev, unsigned speed) { unsigned state = dev->fsm.substate; unsigned delay = 0; u8 control[2]; static int ret = 0; IRDA_DEBUG(2, "%s()\n", __FUNCTION__); switch (state) { case SIRDEV_STATE_DONGLE_SPEED: /* Set DTR to enter command mode */ sirdev_set_dtr_rts(dev, TRUE, FALSE); udelay(500); ret = 0; switch (speed) { default: speed = 9600; ret = -EINVAL; /* fall through */ case 9600: 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 */ sirdev_raw_write(dev, control, 2); dev->speed = speed; state = MCP2120_STATE_WAIT_SPEED; delay = 100; //printk("mcp2120_change_speed: dongle_speed\n"); break; case MCP2120_STATE_WAIT_SPEED: /* Go back to normal mode */ sirdev_set_dtr_rts(dev, FALSE, FALSE); //printk("mcp2120_change_speed: mcp_wait\n"); break; default: IRDA_ERROR("%s(), undefine state %d\n", __FUNCTION__, state); ret = -EINVAL; break; } dev->fsm.substate = state; return (delay > 0) ? delay : 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). * */ #define MCP2120_STATE_WAIT1_RESET (SIRDEV_STATE_DONGLE_RESET+1) #define MCP2120_STATE_WAIT2_RESET (SIRDEV_STATE_DONGLE_RESET+2) static int mcp2120_reset(struct sir_dev *dev) { unsigned state = dev->fsm.substate; unsigned delay = 0; int ret = 0; IRDA_DEBUG(2, "%s()\n", __FUNCTION__); switch (state) { case SIRDEV_STATE_DONGLE_RESET: //printk("mcp2120_reset: dongle_reset\n"); /* Reset dongle by setting RTS*/ sirdev_set_dtr_rts(dev, TRUE, TRUE); state = MCP2120_STATE_WAIT1_RESET; delay = 50; break; case MCP2120_STATE_WAIT1_RESET: //printk("mcp2120_reset: mcp2120_wait1\n"); /* clear RTS and wait for at least 30 ms. */ sirdev_set_dtr_rts(dev, FALSE, FALSE); state = MCP2120_STATE_WAIT2_RESET; delay = 50; break; case MCP2120_STATE_WAIT2_RESET: //printk("mcp2120_reset mcp2120_wait2\n"); /* Go back to normal mode */ sirdev_set_dtr_rts(dev, FALSE, FALSE); break; default: IRDA_ERROR("%s(), undefined state %d\n", __FUNCTION__, state); ret = -EINVAL; break; } dev->fsm.substate = state; return (delay > 0) ? delay : ret; } MODULE_AUTHOR("Felix Tang <tangf@eyetap.org>"); MODULE_DESCRIPTION("Microchip MCP2120"); MODULE_LICENSE("GPL"); MODULE_ALIAS("irda-dongle-9"); /* IRDA_MCP2120_DONGLE */ module_init(mcp2120_sir_init); module_exit(mcp2120_sir_cleanup);