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path: root/drivers/net/irda/ma600-sir.c
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Diffstat (limited to 'drivers/net/irda/ma600-sir.c')
-rw-r--r--drivers/net/irda/ma600-sir.c264
1 files changed, 264 insertions, 0 deletions
diff --git a/drivers/net/irda/ma600-sir.c b/drivers/net/irda/ma600-sir.c
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index 000000000000..ebed168b7da6
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+++ b/drivers/net/irda/ma600-sir.c
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+/*********************************************************************
+ *
+ * Filename: ma600.c
+ * Version: 0.1
+ * Description: Implementation of the MA600 dongle
+ * Status: Experimental.
+ * Author: Leung <95Etwl@alumni.ee.ust.hk> http://www.engsvr.ust/~eetwl95
+ * Created at: Sat Jun 10 20:02:35 2000
+ * Modified at: Sat Aug 16 09:34:13 2003
+ * Modified by: Martin Diehl <mad@mdiehl.de> (modified for new sir_dev)
+ *
+ * Note: very thanks to Mr. Maru Wang <maru@mobileaction.com.tw> for providing
+ * information on the MA600 dongle
+ *
+ * Copyright (c) 2000 Leung, 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ ********************************************************************/
+
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+
+#include <net/irda/irda.h>
+
+#include "sir-dev.h"
+
+static int ma600_open(struct sir_dev *);
+static int ma600_close(struct sir_dev *);
+static int ma600_change_speed(struct sir_dev *, unsigned);
+static int ma600_reset(struct sir_dev *);
+
+/* control byte for MA600 */
+#define MA600_9600 0x00
+#define MA600_19200 0x01
+#define MA600_38400 0x02
+#define MA600_57600 0x03
+#define MA600_115200 0x04
+#define MA600_DEV_ID1 0x05
+#define MA600_DEV_ID2 0x06
+#define MA600_2400 0x08
+
+static struct dongle_driver ma600 = {
+ .owner = THIS_MODULE,
+ .driver_name = "MA600",
+ .type = IRDA_MA600_DONGLE,
+ .open = ma600_open,
+ .close = ma600_close,
+ .reset = ma600_reset,
+ .set_speed = ma600_change_speed,
+};
+
+
+static int __init ma600_sir_init(void)
+{
+ IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
+ return irda_register_dongle(&ma600);
+}
+
+static void __exit ma600_sir_cleanup(void)
+{
+ IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
+ irda_unregister_dongle(&ma600);
+}
+
+/*
+ Power on:
+ (0) Clear RTS and DTR for 1 second
+ (1) Set RTS and DTR for 1 second
+ (2) 9600 bps now
+ Note: assume RTS, DTR are clear before
+*/
+static int ma600_open(struct sir_dev *dev)
+{
+ struct qos_info *qos = &dev->qos;
+
+ IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
+
+ sirdev_set_dtr_rts(dev, TRUE, TRUE);
+
+ /* Explicitly set the speeds we can accept */
+ qos->baud_rate.bits &= IR_2400|IR_9600|IR_19200|IR_38400
+ |IR_57600|IR_115200;
+ /* Hm, 0x01 means 10ms - for >= 1ms we would need 0x07 */
+ qos->min_turn_time.bits = 0x01; /* Needs at least 1 ms */
+ irda_qos_bits_to_value(qos);
+
+ /* irda thread waits 50 msec for power settling */
+
+ return 0;
+}
+
+static int ma600_close(struct sir_dev *dev)
+{
+ IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
+
+ /* Power off dongle */
+ sirdev_set_dtr_rts(dev, FALSE, FALSE);
+
+ return 0;
+}
+
+static __u8 get_control_byte(__u32 speed)
+{
+ __u8 byte;
+
+ switch (speed) {
+ default:
+ case 115200:
+ byte = MA600_115200;
+ break;
+ case 57600:
+ byte = MA600_57600;
+ break;
+ case 38400:
+ byte = MA600_38400;
+ break;
+ case 19200:
+ byte = MA600_19200;
+ break;
+ case 9600:
+ byte = MA600_9600;
+ break;
+ case 2400:
+ byte = MA600_2400;
+ break;
+ }
+
+ return byte;
+}
+
+/*
+ * Function ma600_change_speed (dev, speed)
+ *
+ * Set the speed for the MA600 type dongle.
+ *
+ * The dongle has already been reset to a known state (dongle default)
+ * We cycle through speeds by pulsing RTS low and then high.
+ */
+
+/*
+ * Function ma600_change_speed (dev, speed)
+ *
+ * Set the speed for the MA600 type dongle.
+ *
+ * Algorithm
+ * 1. Reset (already done by irda thread state machine)
+ * 2. clear RTS, set DTR and wait for 1ms
+ * 3. send Control Byte to the MA600 through TXD to set new baud rate
+ * wait until the stop bit of Control Byte is sent (for 9600 baud rate,
+ * it takes about 10 msec)
+ * 4. set RTS, set DTR (return to NORMAL Operation)
+ * 5. wait at least 10 ms, new setting (baud rate, etc) takes effect here
+ * after
+ */
+
+/* total delays are only about 20ms - let's just sleep for now to
+ * avoid the state machine complexity before we get things working
+ */
+
+static int ma600_change_speed(struct sir_dev *dev, unsigned speed)
+{
+ u8 byte;
+
+ IRDA_DEBUG(2, "%s(), speed=%d (was %d)\n", __FUNCTION__,
+ speed, dev->speed);
+
+ /* dongle already reset, dongle and port at default speed (9600) */
+
+ /* Set RTS low for 1 ms */
+ sirdev_set_dtr_rts(dev, TRUE, FALSE);
+ mdelay(1);
+
+ /* Write control byte */
+ byte = get_control_byte(speed);
+ sirdev_raw_write(dev, &byte, sizeof(byte));
+
+ /* Wait at least 10ms: fake wait_until_sent - 10 bits at 9600 baud*/
+ msleep(15); /* old ma600 uses 15ms */
+
+#if 1
+ /* read-back of the control byte. ma600 is the first dongle driver
+ * which uses this so there might be some unidentified issues.
+ * Disable this in case of problems with readback.
+ */
+
+ sirdev_raw_read(dev, &byte, sizeof(byte));
+ if (byte != get_control_byte(speed)) {
+ IRDA_WARNING("%s(): bad control byte read-back %02x != %02x\n",
+ __FUNCTION__, (unsigned) byte,
+ (unsigned) get_control_byte(speed));
+ return -1;
+ }
+ else
+ IRDA_DEBUG(2, "%s() control byte write read OK\n", __FUNCTION__);
+#endif
+
+ /* Set DTR, Set RTS */
+ sirdev_set_dtr_rts(dev, TRUE, TRUE);
+
+ /* Wait at least 10ms */
+ msleep(10);
+
+ /* dongle is now switched to the new speed */
+ dev->speed = speed;
+
+ return 0;
+}
+
+/*
+ * Function ma600_reset (dev)
+ *
+ * This function resets the ma600 dongle.
+ *
+ * Algorithm:
+ * 0. DTR=0, RTS=1 and wait 10 ms
+ * 1. DTR=1, RTS=1 and wait 10 ms
+ * 2. 9600 bps now
+ */
+
+/* total delays are only about 20ms - let's just sleep for now to
+ * avoid the state machine complexity before we get things working
+ */
+
+int ma600_reset(struct sir_dev *dev)
+{
+ IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
+
+ /* Reset the dongle : set DTR low for 10 ms */
+ sirdev_set_dtr_rts(dev, FALSE, TRUE);
+ msleep(10);
+
+ /* Go back to normal mode */
+ sirdev_set_dtr_rts(dev, TRUE, TRUE);
+ msleep(10);
+
+ dev->speed = 9600; /* That's the dongle-default */
+
+ return 0;
+}
+
+MODULE_AUTHOR("Leung <95Etwl@alumni.ee.ust.hk> http://www.engsvr.ust/~eetwl95");
+MODULE_DESCRIPTION("MA600 dongle driver version 0.1");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("irda-dongle-11"); /* IRDA_MA600_DONGLE */
+
+module_init(ma600_sir_init);
+module_exit(ma600_sir_cleanup);
+
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