--- /dev/null
+/*********************************************************************
+ *
+ *
+ * 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;
+
+ /* 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)
+{
+ /* 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;
+
+ 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:
+ net_err_ratelimited("%s(), undefine state %d\n",
+ __func__, 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;
+
+ 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:
+ net_err_ratelimited("%s(), undefined state %d\n",
+ __func__, 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);
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