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Diffstat (limited to 'drivers/net/irda/tekram.c')
-rw-r--r--drivers/net/irda/tekram.c282
1 files changed, 282 insertions, 0 deletions
diff --git a/drivers/net/irda/tekram.c b/drivers/net/irda/tekram.c
new file mode 100644
index 0000000..8f62582
--- /dev/null
+++ b/drivers/net/irda/tekram.c
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+/*********************************************************************
+ *
+ * Filename: tekram.c
+ * Version: 1.2
+ * Description: Implementation of the Tekram IrMate IR-210B dongle
+ * Status: Experimental.
+ * Author: Dag Brattli <dagb@cs.uit.no>
+ * Created at: Wed Oct 21 20:02:35 1998
+ * Modified at: Fri Dec 17 09:13:09 1999
+ * Modified by: Dag Brattli <dagb@cs.uit.no>
+ *
+ * Copyright (c) 1998-1999 Dag Brattli, 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.
+ *
+ * Neither Dag Brattli nor University of Tromsų admit liability nor
+ * provide warranty for any of this software. This material is
+ * provided "AS-IS" and at no charge.
+ *
+ ********************************************************************/
+
+#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 void tekram_open(dongle_t *self, struct qos_info *qos);
+static void tekram_close(dongle_t *self);
+static int tekram_change_speed(struct irda_task *task);
+static int tekram_reset(struct irda_task *task);
+
+#define TEKRAM_115200 0x00
+#define TEKRAM_57600 0x01
+#define TEKRAM_38400 0x02
+#define TEKRAM_19200 0x03
+#define TEKRAM_9600 0x04
+
+#define TEKRAM_PW 0x10 /* Pulse select bit */
+
+static struct dongle_reg dongle = {
+ .type = IRDA_TEKRAM_DONGLE,
+ .open = tekram_open,
+ .close = tekram_close,
+ .reset = tekram_reset,
+ .change_speed = tekram_change_speed,
+ .owner = THIS_MODULE,
+};
+
+static int __init tekram_init(void)
+{
+ return irda_device_register_dongle(&dongle);
+}
+
+static void __exit tekram_cleanup(void)
+{
+ irda_device_unregister_dongle(&dongle);
+}
+
+static void tekram_open(dongle_t *self, struct qos_info *qos)
+{
+ IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
+
+ qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
+ qos->min_turn_time.bits = 0x01; /* Needs at least 10 ms */
+ irda_qos_bits_to_value(qos);
+}
+
+static void tekram_close(dongle_t *self)
+{
+ IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
+
+ /* Power off dongle */
+ self->set_dtr_rts(self->dev, FALSE, FALSE);
+
+ if (self->reset_task)
+ irda_task_delete(self->reset_task);
+ if (self->speed_task)
+ irda_task_delete(self->speed_task);
+}
+
+/*
+ * Function tekram_change_speed (dev, state, speed)
+ *
+ * Set the speed for the Tekram IRMate 210 type dongle. Warning, this
+ * function must be called with a process context!
+ *
+ * Algorithm
+ * 1. clear DTR
+ * 2. set RTS, and wait at least 7 us
+ * 3. send Control Byte to the IR-210 through TXD to set new baud rate
+ * wait until the stop bit of Control Byte is sent (for 9600 baud rate,
+ * it takes about 100 msec)
+ * 5. clear RTS (return to NORMAL Operation)
+ * 6. wait at least 50 us, new setting (baud rate, etc) takes effect here
+ * after
+ */
+static int tekram_change_speed(struct irda_task *task)
+{
+ dongle_t *self = (dongle_t *) task->instance;
+ __u32 speed = (__u32) task->param;
+ __u8 byte;
+ int ret = 0;
+
+ IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
+
+ IRDA_ASSERT(task != NULL, return -1;);
+
+ if (self->speed_task && self->speed_task != task) {
+ IRDA_DEBUG(0, "%s(), busy!\n", __FUNCTION__ );
+ return msecs_to_jiffies(10);
+ } else
+ self->speed_task = task;
+
+ switch (speed) {
+ default:
+ case 9600:
+ byte = TEKRAM_PW|TEKRAM_9600;
+ break;
+ case 19200:
+ byte = TEKRAM_PW|TEKRAM_19200;
+ break;
+ case 38400:
+ byte = TEKRAM_PW|TEKRAM_38400;
+ break;
+ case 57600:
+ byte = TEKRAM_PW|TEKRAM_57600;
+ break;
+ case 115200:
+ byte = TEKRAM_115200;
+ break;
+ }
+
+ switch (task->state) {
+ case IRDA_TASK_INIT:
+ case IRDA_TASK_CHILD_INIT:
+ /*
+ * Need to reset the dongle and go to 9600 bps before
+ * programming
+ */
+ if (irda_task_execute(self, tekram_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);
+ } else
+ irda_task_next_state(task, IRDA_TASK_CHILD_DONE);
+ 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, Clear RTS */
+ self->set_dtr_rts(self->dev, TRUE, FALSE);
+
+ /* Wait at least 7us */
+ udelay(14);
+
+ /* Write control byte */
+ self->write(self->dev, &byte, 1);
+
+ irda_task_next_state(task, IRDA_TASK_WAIT);
+
+ /* Wait at least 100 ms */
+ ret = msecs_to_jiffies(150);
+ break;
+ case IRDA_TASK_WAIT:
+ /* Set DTR, Set RTS */
+ self->set_dtr_rts(self->dev, TRUE, TRUE);
+
+ irda_task_next_state(task, IRDA_TASK_DONE);
+ self->speed_task = NULL;
+ 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 tekram_reset (driver)
+ *
+ * This function resets the tekram dongle. Warning, this function
+ * must be called with a process context!!
+ *
+ * Algorithm:
+ * 0. Clear RTS and DTR, and wait 50 ms (power off the IR-210 )
+ * 1. clear RTS
+ * 2. set DTR, and wait at least 1 ms
+ * 3. clear DTR to SPACE state, wait at least 50 us for further
+ * operation
+ */
+int tekram_reset(struct irda_task *task)
+{
+ dongle_t *self = (dongle_t *) task->instance;
+ int ret = 0;
+
+ IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
+
+ IRDA_ASSERT(task != NULL, return -1;);
+
+ if (self->reset_task && self->reset_task != task) {
+ IRDA_DEBUG(0, "%s(), busy!\n", __FUNCTION__ );
+ return msecs_to_jiffies(10);
+ } else
+ self->reset_task = task;
+
+ /* Power off dongle */
+ //self->set_dtr_rts(self->dev, FALSE, FALSE);
+ self->set_dtr_rts(self->dev, TRUE, TRUE);
+
+ switch (task->state) {
+ case IRDA_TASK_INIT:
+ irda_task_next_state(task, IRDA_TASK_WAIT1);
+
+ /* Sleep 50 ms */
+ ret = msecs_to_jiffies(50);
+ break;
+ case IRDA_TASK_WAIT1:
+ /* Clear DTR, Set RTS */
+ self->set_dtr_rts(self->dev, FALSE, TRUE);
+
+ irda_task_next_state(task, IRDA_TASK_WAIT2);
+
+ /* Should sleep 1 ms */
+ ret = msecs_to_jiffies(1);
+ break;
+ case IRDA_TASK_WAIT2:
+ /* Set DTR, Set RTS */
+ self->set_dtr_rts(self->dev, TRUE, TRUE);
+
+ /* Wait at least 50 us */
+ udelay(75);
+
+ 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;
+ }
+ return ret;
+}
+
+MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
+MODULE_DESCRIPTION("Tekram IrMate IR-210B dongle driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("irda-dongle-0"); /* IRDA_TEKRAM_DONGLE */
+
+/*
+ * Function init_module (void)
+ *
+ * Initialize Tekram module
+ *
+ */
+module_init(tekram_init);
+
+/*
+ * Function cleanup_module (void)
+ *
+ * Cleanup Tekram module
+ *
+ */
+module_exit(tekram_cleanup);
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