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/*********************************************************************

 *

 *

 * 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/tty.h>

#include <linux/init.h>

#include <net/irda/irda.h>

#include <net/irda/irda_device.h>

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 = {

        .type = IRDA_MCP2120_DONGLE,

        .open = mcp2120_open,

        .close = mcp2120_close,

        .reset = mcp2120_reset,

        .change_speed = mcp2120_change_speed,

        .owner = THIS_MODULE,

};

static int __init mcp2120_init(void)

{

        return irda_device_register_dongle(&dongle);

}

static void __exit 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;

}

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);

}

/*

 * 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:

                IRDA_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:

                IRDA_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:

                IRDA_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;

}

MODULE_AUTHOR("Felix Tang <tangf@eyetap.org>");

MODULE_DESCRIPTION("Microchip MCP2120");

MODULE_LICENSE("GPL");

MODULE_ALIAS("irda-dongle-9"); /* IRDA_MCP2120_DONGLE */

/*

 * Function init_module (void)

 *

 *    Initialize MCP2120 module

 *

 */

module_init(mcp2120_init);

/*

 * Function cleanup_module (void)

 *

 *    Cleanup MCP2120 module

 *

 */

module_exit(mcp2120_cleanup);