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1 | /********************************************************************* |
2 | * | |
3 | * Filename: litelink.c | |
4 | * Version: 1.1 | |
5 | * Description: Driver for the Parallax LiteLink dongle | |
6 | * Status: Stable | |
7 | * Author: Dag Brattli <dagb@cs.uit.no> | |
8 | * Created at: Fri May 7 12:50:33 1999 | |
9 | * Modified at: Fri Dec 17 09:14:23 1999 | |
10 | * Modified by: Dag Brattli <dagb@cs.uit.no> | |
11 | * | |
12 | * Copyright (c) 1999 Dag Brattli, All Rights Reserved. | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License as | |
16 | * published by the Free Software Foundation; either version 2 of | |
17 | * the License, or (at your option) any later version. | |
18 | * | |
19 | * This program is distributed in the hope that it will be useful, | |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | * GNU General Public License for more details. | |
23 | * | |
24 | * You should have received a copy of the GNU General Public License | |
25 | * along with this program; if not, write to the Free Software | |
26 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
27 | * MA 02111-1307 USA | |
28 | * | |
29 | ********************************************************************/ | |
30 | ||
31 | #include <linux/module.h> | |
32 | #include <linux/delay.h> | |
33 | #include <linux/tty.h> | |
34 | #include <linux/init.h> | |
35 | ||
36 | #include <net/irda/irda.h> | |
37 | #include <net/irda/irda_device.h> | |
38 | ||
39 | #define MIN_DELAY 25 /* 15 us, but wait a little more to be sure */ | |
40 | #define MAX_DELAY 10000 /* 1 ms */ | |
41 | ||
42 | static void litelink_open(dongle_t *self, struct qos_info *qos); | |
43 | static void litelink_close(dongle_t *self); | |
44 | static int litelink_change_speed(struct irda_task *task); | |
45 | static int litelink_reset(struct irda_task *task); | |
46 | ||
47 | /* These are the baudrates supported */ | |
48 | static __u32 baud_rates[] = { 115200, 57600, 38400, 19200, 9600 }; | |
49 | ||
50 | static struct dongle_reg dongle = { | |
51 | .type = IRDA_LITELINK_DONGLE, | |
52 | .open = litelink_open, | |
53 | .close = litelink_close, | |
54 | .reset = litelink_reset, | |
55 | .change_speed = litelink_change_speed, | |
56 | .owner = THIS_MODULE, | |
57 | }; | |
58 | ||
59 | static int __init litelink_init(void) | |
60 | { | |
61 | return irda_device_register_dongle(&dongle); | |
62 | } | |
63 | ||
64 | static void __exit litelink_cleanup(void) | |
65 | { | |
66 | irda_device_unregister_dongle(&dongle); | |
67 | } | |
68 | ||
69 | static void litelink_open(dongle_t *self, struct qos_info *qos) | |
70 | { | |
71 | qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200; | |
72 | qos->min_turn_time.bits = 0x7f; /* Needs 0.01 ms */ | |
73 | } | |
74 | ||
75 | static void litelink_close(dongle_t *self) | |
76 | { | |
77 | /* Power off dongle */ | |
78 | self->set_dtr_rts(self->dev, FALSE, FALSE); | |
79 | } | |
80 | ||
81 | /* | |
82 | * Function litelink_change_speed (task) | |
83 | * | |
84 | * Change speed of the Litelink dongle. To cycle through the available | |
85 | * baud rates, pulse RTS low for a few ms. | |
86 | */ | |
87 | static int litelink_change_speed(struct irda_task *task) | |
88 | { | |
89 | dongle_t *self = (dongle_t *) task->instance; | |
90 | __u32 speed = (__u32) task->param; | |
91 | int i; | |
92 | ||
93 | /* Clear RTS to reset dongle */ | |
94 | self->set_dtr_rts(self->dev, TRUE, FALSE); | |
95 | ||
96 | /* Sleep a minimum of 15 us */ | |
97 | udelay(MIN_DELAY); | |
98 | ||
99 | /* Go back to normal mode */ | |
100 | self->set_dtr_rts(self->dev, TRUE, TRUE); | |
101 | ||
102 | /* Sleep a minimum of 15 us */ | |
103 | udelay(MIN_DELAY); | |
104 | ||
105 | /* Cycle through avaiable baudrates until we reach the correct one */ | |
106 | for (i=0; i<5 && baud_rates[i] != speed; i++) { | |
107 | /* Set DTR, clear RTS */ | |
108 | self->set_dtr_rts(self->dev, FALSE, TRUE); | |
109 | ||
110 | /* Sleep a minimum of 15 us */ | |
111 | udelay(MIN_DELAY); | |
112 | ||
113 | /* Set DTR, Set RTS */ | |
114 | self->set_dtr_rts(self->dev, TRUE, TRUE); | |
115 | ||
116 | /* Sleep a minimum of 15 us */ | |
117 | udelay(MIN_DELAY); | |
118 | } | |
119 | irda_task_next_state(task, IRDA_TASK_DONE); | |
120 | ||
121 | return 0; | |
122 | } | |
123 | ||
124 | /* | |
125 | * Function litelink_reset (task) | |
126 | * | |
127 | * Reset the Litelink type dongle. | |
128 | * | |
129 | */ | |
130 | static int litelink_reset(struct irda_task *task) | |
131 | { | |
132 | dongle_t *self = (dongle_t *) task->instance; | |
133 | ||
134 | /* Power on dongle */ | |
135 | self->set_dtr_rts(self->dev, TRUE, TRUE); | |
136 | ||
137 | /* Sleep a minimum of 15 us */ | |
138 | udelay(MIN_DELAY); | |
139 | ||
140 | /* Clear RTS to reset dongle */ | |
141 | self->set_dtr_rts(self->dev, TRUE, FALSE); | |
142 | ||
143 | /* Sleep a minimum of 15 us */ | |
144 | udelay(MIN_DELAY); | |
145 | ||
146 | /* Go back to normal mode */ | |
147 | self->set_dtr_rts(self->dev, TRUE, TRUE); | |
148 | ||
149 | /* Sleep a minimum of 15 us */ | |
150 | udelay(MIN_DELAY); | |
151 | ||
152 | /* This dongles speed defaults to 115200 bps */ | |
153 | self->speed = 115200; | |
154 | ||
155 | irda_task_next_state(task, IRDA_TASK_DONE); | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
160 | MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>"); | |
161 | MODULE_DESCRIPTION("Parallax Litelink dongle driver"); | |
162 | MODULE_LICENSE("GPL"); | |
163 | MODULE_ALIAS("irda-dongle-5"); /* IRDA_LITELINK_DONGLE */ | |
164 | ||
165 | /* | |
166 | * Function init_module (void) | |
167 | * | |
168 | * Initialize Litelink module | |
169 | * | |
170 | */ | |
171 | module_init(litelink_init); | |
172 | ||
173 | /* | |
174 | * Function cleanup_module (void) | |
175 | * | |
176 | * Cleanup Litelink module | |
177 | * | |
178 | */ | |
179 | module_exit(litelink_cleanup); |