[IRDA]: Add litelink-sir driver.

From Eugene Crosser.

* converted for new api from old driver

From Martin Diehl.

* convert to de-virtualized sirdev helpers
* set dongle to 9600 in case of invalid speed instead leaving it in
  unknown configuration

diff --git a/drivers/net/irda/litelink-sir.c b/drivers/net/irda/litelink-sir.c
new file mode 100644 (file)
index 0000000..c651fcb
--- /dev/null
+++ b/drivers/net/irda/litelink-sir.c
@@ -0,0 +1,209 @@
+/*********************************************************************
+ *                
+ * Filename:      litelink.c
+ * Version:       1.1
+ * Description:   Driver for the Parallax LiteLink dongle
+ * Status:        Stable
+ * Author:        Dag Brattli <dagb@cs.uit.no>
+ * Created at:    Fri May  7 12:50:33 1999
+ * Modified at:   Fri Dec 17 09:14:23 1999
+ * Modified by:   Dag Brattli <dagb@cs.uit.no>
+ * 
+ *     Copyright (c) 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.
+ * 
+ *     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
+ *     
+ ********************************************************************/
+
+/*
+ * Modified at:   Thu Jan 15 2003
+ * Modified by:   Eugene Crosser <crosser@average.org>
+ *
+ * Convert to "new" IRDA infrastructure for kernel 2.6
+ */
+
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+
+#include <net/irda/irda.h>
+
+#include "sir-dev.h"
+
+#define MIN_DELAY 25      /* 15 us, but wait a little more to be sure */
+#define MAX_DELAY 10000   /* 1 ms */
+
+static int litelink_open(struct sir_dev *dev);
+static int litelink_close(struct sir_dev *dev);
+static int litelink_change_speed(struct sir_dev *dev, unsigned speed);
+static int litelink_reset(struct sir_dev *dev);
+
+/* These are the baudrates supported - 9600 must be last one! */
+static unsigned baud_rates[] = { 115200, 57600, 38400, 19200, 9600 };
+
+static struct dongle_driver litelink = {
+       .owner          = THIS_MODULE,
+       .driver_name    = "Parallax LiteLink",
+       .type           = IRDA_LITELINK_DONGLE,
+       .open           = litelink_open,
+       .close          = litelink_close,
+       .reset          = litelink_reset,
+       .set_speed      = litelink_change_speed,
+};
+
+int __init litelink_sir_init(void)
+{
+       return irda_register_dongle(&litelink);
+}
+
+void __exit litelink_sir_cleanup(void)
+{
+       irda_unregister_dongle(&litelink);
+}
+
+static int litelink_open(struct sir_dev *dev)
+{
+       struct qos_info *qos = &dev->qos;
+
+       IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
+
+       /* Power up dongle */
+       sirdev_set_dtr_rts(dev, TRUE, TRUE);
+
+       /* Set the speeds we can accept */
+       qos->baud_rate.bits &= IR_115200|IR_57600|IR_38400|IR_19200|IR_9600;
+       qos->min_turn_time.bits = 0x7f; /* Needs 0.01 ms */
+       irda_qos_bits_to_value(qos);
+
+       /* irda thread waits 50 msec for power settling */
+
+       return 0;
+}
+
+static int litelink_close(struct sir_dev *dev)
+{
+       IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
+
+       /* Power off dongle */
+       sirdev_set_dtr_rts(dev, FALSE, FALSE);
+
+       return 0;
+}
+
+/*
+ * Function litelink_change_speed (task)
+ *
+ *    Change speed of the Litelink dongle. To cycle through the available 
+ *    baud rates, pulse RTS low for a few ms.  
+ */
+static int litelink_change_speed(struct sir_dev *dev, unsigned speed)
+{
+        int i;
+
+       IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
+
+       /* dongle already reset by irda-thread - current speed (dongle and
+        * port) is the default speed (115200 for litelink!)
+        */
+
+       /* Cycle through avaiable baudrates until we reach the correct one */
+       for (i = 0; baud_rates[i] != speed; i++) {
+
+               /* end-of-list reached due to invalid speed request */
+               if (baud_rates[i] == 9600)
+                       break;
+
+               /* Set DTR, clear RTS */
+               sirdev_set_dtr_rts(dev, FALSE, TRUE);
+
+               /* Sleep a minimum of 15 us */
+               udelay(MIN_DELAY);
+
+               /* Set DTR, Set RTS */
+               sirdev_set_dtr_rts(dev, TRUE, TRUE);
+
+               /* Sleep a minimum of 15 us */
+               udelay(MIN_DELAY);
+        }
+
+       dev->speed = baud_rates[i];
+
+       /* invalid baudrate should not happen - but if, we return -EINVAL and
+        * the dongle configured for 9600 so the stack has a chance to recover
+        */
+
+       return (dev->speed == speed) ? 0 : -EINVAL;
+}
+
+/*
+ * Function litelink_reset (task)
+ *
+ *      Reset the Litelink type dongle.
+ *
+ */
+static int litelink_reset(struct sir_dev *dev)
+{
+       IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
+
+       /* probably the power-up can be dropped here, but with only
+        * 15 usec delay it's not worth the risk unless somebody with
+        * the hardware confirms it doesn't break anything...
+        */
+
+       /* Power on dongle */
+       sirdev_set_dtr_rts(dev, TRUE, TRUE);
+
+       /* Sleep a minimum of 15 us */
+       udelay(MIN_DELAY);
+
+       /* Clear RTS to reset dongle */
+       sirdev_set_dtr_rts(dev, TRUE, FALSE);
+
+       /* Sleep a minimum of 15 us */
+       udelay(MIN_DELAY);
+
+       /* Go back to normal mode */
+       sirdev_set_dtr_rts(dev, TRUE, TRUE);
+
+       /* Sleep a minimum of 15 us */
+       udelay(MIN_DELAY);
+
+       /* This dongles speed defaults to 115200 bps */
+       dev->speed = 115200;
+
+       return 0;
+}
+
+MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
+MODULE_DESCRIPTION("Parallax Litelink dongle driver"); 
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("irda-dongle-5"); /* IRDA_LITELINK_DONGLE */
+
+/*
+ * Function init_module (void)
+ *
+ *    Initialize Litelink module
+ *
+ */
+module_init(litelink_sir_init);
+
+/*
+ * Function cleanup_module (void)
+ *
+ *    Cleanup Litelink module
+ *
+ */
+module_exit(litelink_sir_cleanup);