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1 | /********************************************************************* |
2 | * | |
3 | * Filename: girbil.c | |
4 | * Version: 1.2 | |
5 | * Description: Implementation for the Greenwich GIrBIL dongle | |
6 | * Status: Experimental. | |
7 | * Author: Dag Brattli <dagb@cs.uit.no> | |
8 | * Created at: Sat Feb 6 21:02:33 1999 | |
9 | * Modified at: Fri Dec 17 09:13:20 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 | * | |
96de0e25 | 19 | * Neither Dag Brattli nor University of Tromsø admit liability nor |
1da177e4 LT |
20 | * provide warranty for any of this software. This material is |
21 | * provided "AS-IS" and at no charge. | |
22 | * | |
23 | ********************************************************************/ | |
24 | ||
25 | #include <linux/module.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/tty.h> | |
28 | #include <linux/init.h> | |
29 | ||
30 | #include <net/irda/irda.h> | |
31 | #include <net/irda/irda_device.h> | |
32 | ||
33 | static int girbil_reset(struct irda_task *task); | |
34 | static void girbil_open(dongle_t *self, struct qos_info *qos); | |
35 | static void girbil_close(dongle_t *self); | |
36 | static int girbil_change_speed(struct irda_task *task); | |
37 | ||
38 | /* Control register 1 */ | |
39 | #define GIRBIL_TXEN 0x01 /* Enable transmitter */ | |
40 | #define GIRBIL_RXEN 0x02 /* Enable receiver */ | |
41 | #define GIRBIL_ECAN 0x04 /* Cancel self emmited data */ | |
42 | #define GIRBIL_ECHO 0x08 /* Echo control characters */ | |
43 | ||
44 | /* LED Current Register (0x2) */ | |
45 | #define GIRBIL_HIGH 0x20 | |
46 | #define GIRBIL_MEDIUM 0x21 | |
47 | #define GIRBIL_LOW 0x22 | |
48 | ||
49 | /* Baud register (0x3) */ | |
50 | #define GIRBIL_2400 0x30 | |
51 | #define GIRBIL_4800 0x31 | |
52 | #define GIRBIL_9600 0x32 | |
53 | #define GIRBIL_19200 0x33 | |
54 | #define GIRBIL_38400 0x34 | |
55 | #define GIRBIL_57600 0x35 | |
56 | #define GIRBIL_115200 0x36 | |
57 | ||
58 | /* Mode register (0x4) */ | |
59 | #define GIRBIL_IRDA 0x40 | |
60 | #define GIRBIL_ASK 0x41 | |
61 | ||
62 | /* Control register 2 (0x5) */ | |
63 | #define GIRBIL_LOAD 0x51 /* Load the new baud rate value */ | |
64 | ||
65 | static struct dongle_reg dongle = { | |
66 | .type = IRDA_GIRBIL_DONGLE, | |
67 | .open = girbil_open, | |
68 | .close = girbil_close, | |
69 | .reset = girbil_reset, | |
70 | .change_speed = girbil_change_speed, | |
71 | .owner = THIS_MODULE, | |
72 | }; | |
73 | ||
74 | static int __init girbil_init(void) | |
75 | { | |
76 | return irda_device_register_dongle(&dongle); | |
77 | } | |
78 | ||
79 | static void __exit girbil_cleanup(void) | |
80 | { | |
81 | irda_device_unregister_dongle(&dongle); | |
82 | } | |
83 | ||
84 | static void girbil_open(dongle_t *self, struct qos_info *qos) | |
85 | { | |
86 | qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200; | |
87 | qos->min_turn_time.bits = 0x03; | |
88 | } | |
89 | ||
90 | static void girbil_close(dongle_t *self) | |
91 | { | |
92 | /* Power off dongle */ | |
93 | self->set_dtr_rts(self->dev, FALSE, FALSE); | |
94 | } | |
95 | ||
96 | /* | |
97 | * Function girbil_change_speed (dev, speed) | |
98 | * | |
99 | * Set the speed for the Girbil type dongle. | |
100 | * | |
101 | */ | |
102 | static int girbil_change_speed(struct irda_task *task) | |
103 | { | |
104 | dongle_t *self = (dongle_t *) task->instance; | |
105 | __u32 speed = (__u32) task->param; | |
106 | __u8 control[2]; | |
107 | int ret = 0; | |
108 | ||
109 | self->speed_task = task; | |
110 | ||
111 | switch (task->state) { | |
112 | case IRDA_TASK_INIT: | |
113 | /* Need to reset the dongle and go to 9600 bps before | |
114 | programming */ | |
115 | if (irda_task_execute(self, girbil_reset, NULL, task, | |
116 | (void *) speed)) | |
117 | { | |
118 | /* Dongle need more time to reset */ | |
119 | irda_task_next_state(task, IRDA_TASK_CHILD_WAIT); | |
120 | ||
121 | /* Give reset 1 sec to finish */ | |
122 | ret = msecs_to_jiffies(1000); | |
123 | } | |
124 | break; | |
125 | case IRDA_TASK_CHILD_WAIT: | |
126 | IRDA_WARNING("%s(), resetting dongle timed out!\n", | |
127 | __FUNCTION__); | |
128 | ret = -1; | |
129 | break; | |
130 | case IRDA_TASK_CHILD_DONE: | |
131 | /* Set DTR and Clear RTS to enter command mode */ | |
132 | self->set_dtr_rts(self->dev, FALSE, TRUE); | |
133 | ||
134 | switch (speed) { | |
135 | case 9600: | |
136 | default: | |
137 | control[0] = GIRBIL_9600; | |
138 | break; | |
139 | case 19200: | |
140 | control[0] = GIRBIL_19200; | |
141 | break; | |
142 | case 34800: | |
143 | control[0] = GIRBIL_38400; | |
144 | break; | |
145 | case 57600: | |
146 | control[0] = GIRBIL_57600; | |
147 | break; | |
148 | case 115200: | |
149 | control[0] = GIRBIL_115200; | |
150 | break; | |
151 | } | |
152 | control[1] = GIRBIL_LOAD; | |
153 | ||
154 | /* Write control bytes */ | |
155 | self->write(self->dev, control, 2); | |
156 | irda_task_next_state(task, IRDA_TASK_WAIT); | |
157 | ret = msecs_to_jiffies(100); | |
158 | break; | |
159 | case IRDA_TASK_WAIT: | |
160 | /* Go back to normal mode */ | |
161 | self->set_dtr_rts(self->dev, TRUE, TRUE); | |
162 | irda_task_next_state(task, IRDA_TASK_DONE); | |
163 | self->speed_task = NULL; | |
164 | break; | |
165 | default: | |
166 | IRDA_ERROR("%s(), unknown state %d\n", | |
167 | __FUNCTION__, task->state); | |
168 | irda_task_next_state(task, IRDA_TASK_DONE); | |
169 | self->speed_task = NULL; | |
170 | ret = -1; | |
171 | break; | |
172 | } | |
173 | return ret; | |
174 | } | |
175 | ||
176 | /* | |
177 | * Function girbil_reset (driver) | |
178 | * | |
179 | * This function resets the girbil dongle. | |
180 | * | |
181 | * Algorithm: | |
182 | * 0. set RTS, and wait at least 5 ms | |
183 | * 1. clear RTS | |
184 | */ | |
185 | static int girbil_reset(struct irda_task *task) | |
186 | { | |
187 | dongle_t *self = (dongle_t *) task->instance; | |
188 | __u8 control = GIRBIL_TXEN | GIRBIL_RXEN; | |
189 | int ret = 0; | |
190 | ||
191 | self->reset_task = task; | |
192 | ||
193 | switch (task->state) { | |
194 | case IRDA_TASK_INIT: | |
195 | /* Reset dongle */ | |
196 | self->set_dtr_rts(self->dev, TRUE, FALSE); | |
197 | irda_task_next_state(task, IRDA_TASK_WAIT1); | |
198 | /* Sleep at least 5 ms */ | |
199 | ret = msecs_to_jiffies(20); | |
200 | break; | |
201 | case IRDA_TASK_WAIT1: | |
202 | /* Set DTR and clear RTS to enter command mode */ | |
203 | self->set_dtr_rts(self->dev, FALSE, TRUE); | |
204 | irda_task_next_state(task, IRDA_TASK_WAIT2); | |
205 | ret = msecs_to_jiffies(20); | |
206 | break; | |
207 | case IRDA_TASK_WAIT2: | |
208 | /* Write control byte */ | |
209 | self->write(self->dev, &control, 1); | |
210 | irda_task_next_state(task, IRDA_TASK_WAIT3); | |
211 | ret = msecs_to_jiffies(20); | |
212 | break; | |
213 | case IRDA_TASK_WAIT3: | |
214 | /* Go back to normal mode */ | |
215 | self->set_dtr_rts(self->dev, TRUE, TRUE); | |
216 | irda_task_next_state(task, IRDA_TASK_DONE); | |
217 | self->reset_task = NULL; | |
218 | break; | |
219 | default: | |
220 | IRDA_ERROR("%s(), unknown state %d\n", | |
221 | __FUNCTION__, task->state); | |
222 | irda_task_next_state(task, IRDA_TASK_DONE); | |
223 | self->reset_task = NULL; | |
224 | ret = -1; | |
225 | break; | |
226 | } | |
227 | return ret; | |
228 | } | |
229 | ||
230 | MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>"); | |
231 | MODULE_DESCRIPTION("Greenwich GIrBIL dongle driver"); | |
232 | MODULE_LICENSE("GPL"); | |
233 | MODULE_ALIAS("irda-dongle-4"); /* IRDA_GIRBIL_DONGLE */ | |
234 | ||
235 | /* | |
236 | * Function init_module (void) | |
237 | * | |
238 | * Initialize Girbil module | |
239 | * | |
240 | */ | |
241 | module_init(girbil_init); | |
242 | ||
243 | /* | |
244 | * Function cleanup_module (void) | |
245 | * | |
246 | * Cleanup Girbil module | |
247 | * | |
248 | */ | |
249 | module_exit(girbil_cleanup); | |
250 |