diff options
Diffstat (limited to 'drivers/net/irda/litelink.c')
| -rw-r--r-- | drivers/net/irda/litelink.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/drivers/net/irda/litelink.c b/drivers/net/irda/litelink.c new file mode 100644 index 000000000000..7db11431d0f4 --- /dev/null +++ b/drivers/net/irda/litelink.c @@ -0,0 +1,179 @@ +/********************************************************************* + * + * 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 + * + ********************************************************************/ + +#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> + +#define MIN_DELAY 25 /* 15 us, but wait a little more to be sure */ +#define MAX_DELAY 10000 /* 1 ms */ + +static void litelink_open(dongle_t *self, struct qos_info *qos); +static void litelink_close(dongle_t *self); +static int litelink_change_speed(struct irda_task *task); +static int litelink_reset(struct irda_task *task); + +/* These are the baudrates supported */ +static __u32 baud_rates[] = { 115200, 57600, 38400, 19200, 9600 }; + +static struct dongle_reg dongle = { + .type = IRDA_LITELINK_DONGLE, + .open = litelink_open, + .close = litelink_close, + .reset = litelink_reset, + .change_speed = litelink_change_speed, + .owner = THIS_MODULE, +}; + +static int __init litelink_init(void) +{ + return irda_device_register_dongle(&dongle); +} + +static void __exit litelink_cleanup(void) +{ + irda_device_unregister_dongle(&dongle); +} + +static void litelink_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 = 0x7f; /* Needs 0.01 ms */ +} + +static void litelink_close(dongle_t *self) +{ + /* Power off dongle */ + self->set_dtr_rts(self->dev, FALSE, FALSE); +} + +/* + * 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 irda_task *task) +{ + dongle_t *self = (dongle_t *) task->instance; + __u32 speed = (__u32) task->param; + int i; + + /* Clear RTS to reset dongle */ + self->set_dtr_rts(self->dev, TRUE, FALSE); + + /* Sleep a minimum of 15 us */ + udelay(MIN_DELAY); + + /* Go back to normal mode */ + self->set_dtr_rts(self->dev, TRUE, TRUE); + + /* Sleep a minimum of 15 us */ + udelay(MIN_DELAY); + + /* Cycle through avaiable baudrates until we reach the correct one */ + for (i=0; i<5 && baud_rates[i] != speed; i++) { + /* Set DTR, clear RTS */ + self->set_dtr_rts(self->dev, FALSE, TRUE); + + /* Sleep a minimum of 15 us */ + udelay(MIN_DELAY); + + /* Set DTR, Set RTS */ + self->set_dtr_rts(self->dev, TRUE, TRUE); + + /* Sleep a minimum of 15 us */ + udelay(MIN_DELAY); + } + irda_task_next_state(task, IRDA_TASK_DONE); + + return 0; +} + +/* + * Function litelink_reset (task) + * + * Reset the Litelink type dongle. + * + */ +static int litelink_reset(struct irda_task *task) +{ + dongle_t *self = (dongle_t *) task->instance; + + /* Power on dongle */ + self->set_dtr_rts(self->dev, TRUE, TRUE); + + /* Sleep a minimum of 15 us */ + udelay(MIN_DELAY); + + /* Clear RTS to reset dongle */ + self->set_dtr_rts(self->dev, TRUE, FALSE); + + /* Sleep a minimum of 15 us */ + udelay(MIN_DELAY); + + /* Go back to normal mode */ + self->set_dtr_rts(self->dev, TRUE, TRUE); + + /* Sleep a minimum of 15 us */ + udelay(MIN_DELAY); + + /* This dongles speed defaults to 115200 bps */ + self->speed = 115200; + + irda_task_next_state(task, IRDA_TASK_DONE); + + 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_init); + +/* + * Function cleanup_module (void) + * + * Cleanup Litelink module + * + */ +module_exit(litelink_cleanup); |