tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*********************************************************************
2 *
3 *
4 * Filename: mcp2120.c
5 * Version: 1.0
6 * Description: Implementation for the MCP2120 (Microchip)
7 * Status: Experimental.
8 * Author: Felix Tang (tangf@eyetap.org)
9 * Created at: Sun Mar 31 19:32:12 EST 2002
10 * Based on code by: Dag Brattli <dagb@cs.uit.no>
11 *
12 * Copyright (c) 2002 Felix Tang, 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 ********************************************************************/
20
21#include <linux/module.h>
22#include <linux/delay.h>
23#include <linux/tty.h>
24#include <linux/init.h>
25
26#include <net/irda/irda.h>
27#include <net/irda/irda_device.h>
28
29static int mcp2120_reset(struct irda_task *task);
30static void mcp2120_open(dongle_t *self, struct qos_info *qos);
31static void mcp2120_close(dongle_t *self);
32static int mcp2120_change_speed(struct irda_task *task);
33
34#define MCP2120_9600 0x87
35#define MCP2120_19200 0x8B
36#define MCP2120_38400 0x85
37#define MCP2120_57600 0x83
38#define MCP2120_115200 0x81
39
40#define MCP2120_COMMIT 0x11
41
42static struct dongle_reg dongle = {
43 .type = IRDA_MCP2120_DONGLE,
44 .open = mcp2120_open,
45 .close = mcp2120_close,
46 .reset = mcp2120_reset,
47 .change_speed = mcp2120_change_speed,
48 .owner = THIS_MODULE,
49};
50
51static int __init mcp2120_init(void)
52{
53 return irda_device_register_dongle(&dongle);
54}
55
56static void __exit mcp2120_cleanup(void)
57{
58 irda_device_unregister_dongle(&dongle);
59}
60
61static void mcp2120_open(dongle_t *self, struct qos_info *qos)
62{
63 qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
64 qos->min_turn_time.bits = 0x01;
65}
66
67static void mcp2120_close(dongle_t *self)
68{
69 /* Power off dongle */
70 /* reset and inhibit mcp2120 */
71 self->set_dtr_rts(self->dev, TRUE, TRUE);
72 //self->set_dtr_rts(self->dev, FALSE, FALSE);
73}
74
75/*
76 * Function mcp2120_change_speed (dev, speed)
77 *
78 * Set the speed for the MCP2120.
79 *
80 */
81static int mcp2120_change_speed(struct irda_task *task)
82{
83 dongle_t *self = (dongle_t *) task->instance;
84 __u32 speed = (__u32) task->param;
85 __u8 control[2];
86 int ret = 0;
87
88 self->speed_task = task;
89
90 switch (task->state) {
91 case IRDA_TASK_INIT:
92 /* Need to reset the dongle and go to 9600 bps before
93 programming */
94 //printk("Dmcp2120_change_speed irda_task_init\n");
95 if (irda_task_execute(self, mcp2120_reset, NULL, task,
96 (void *) speed))
97 {
98 /* Dongle need more time to reset */
99 irda_task_next_state(task, IRDA_TASK_CHILD_WAIT);
100
101 /* Give reset 1 sec to finish */
102 ret = msecs_to_jiffies(1000);
103 }
104 break;
105 case IRDA_TASK_CHILD_WAIT:
106 IRDA_WARNING("%s(), resetting dongle timed out!\n",
107 __FUNCTION__);
108 ret = -1;
109 break;
110 case IRDA_TASK_CHILD_DONE:
111 /* Set DTR to enter command mode */
112 self->set_dtr_rts(self->dev, TRUE, FALSE);
113 udelay(500);
114
115 switch (speed) {
116 case 9600:
117 default:
118 control[0] = MCP2120_9600;
119 //printk("mcp2120 9600\n");
120 break;
121 case 19200:
122 control[0] = MCP2120_19200;
123 //printk("mcp2120 19200\n");
124 break;
125 case 34800:
126 control[0] = MCP2120_38400;
127 //printk("mcp2120 38400\n");
128 break;
129 case 57600:
130 control[0] = MCP2120_57600;
131 //printk("mcp2120 57600\n");
132 break;
133 case 115200:
134 control[0] = MCP2120_115200;
135 //printk("mcp2120 115200\n");
136 break;
137 }
138 control[1] = MCP2120_COMMIT;
139
140 /* Write control bytes */
141 self->write(self->dev, control, 2);
142
143 irda_task_next_state(task, IRDA_TASK_WAIT);
144 ret = msecs_to_jiffies(100);
145 //printk("mcp2120_change_speed irda_child_done\n");
146 break;
147 case IRDA_TASK_WAIT:
148 /* Go back to normal mode */
149 self->set_dtr_rts(self->dev, FALSE, FALSE);
150 irda_task_next_state(task, IRDA_TASK_DONE);
151 self->speed_task = NULL;
152 //printk("mcp2120_change_speed irda_task_wait\n");
153 break;
154 default:
155 IRDA_ERROR("%s(), unknown state %d\n",
156 __FUNCTION__, task->state);
157 irda_task_next_state(task, IRDA_TASK_DONE);
158 self->speed_task = NULL;
159 ret = -1;
160 break;
161 }
162 return ret;
163}
164
165/*
166 * Function mcp2120_reset (driver)
167 *
168 * This function resets the mcp2120 dongle.
169 *
170 * Info: -set RTS to reset mcp2120
171 * -set DTR to set mcp2120 software command mode
172 * -mcp2120 defaults to 9600 baud after reset
173 *
174 * Algorithm:
175 * 0. Set RTS to reset mcp2120.
176 * 1. Clear RTS and wait for device reset timer of 30 ms (max).
177 *
178 */
179
180
181static int mcp2120_reset(struct irda_task *task)
182{
183 dongle_t *self = (dongle_t *) task->instance;
184 int ret = 0;
185
186 self->reset_task = task;
187
188 switch (task->state) {
189 case IRDA_TASK_INIT:
190 //printk("mcp2120_reset irda_task_init\n");
191 /* Reset dongle by setting RTS*/
192 self->set_dtr_rts(self->dev, TRUE, TRUE);
193 irda_task_next_state(task, IRDA_TASK_WAIT1);
194 ret = msecs_to_jiffies(50);
195 break;
196 case IRDA_TASK_WAIT1:
197 //printk("mcp2120_reset irda_task_wait1\n");
198 /* clear RTS and wait for at least 30 ms. */
199 self->set_dtr_rts(self->dev, FALSE, FALSE);
200 irda_task_next_state(task, IRDA_TASK_WAIT2);
201 ret = msecs_to_jiffies(50);
202 break;
203 case IRDA_TASK_WAIT2:
204 //printk("mcp2120_reset irda_task_wait2\n");
205 /* Go back to normal mode */
206 self->set_dtr_rts(self->dev, FALSE, FALSE);
207 irda_task_next_state(task, IRDA_TASK_DONE);
208 self->reset_task = NULL;
209 break;
210 default:
211 IRDA_ERROR("%s(), unknown state %d\n",
212 __FUNCTION__, task->state);
213 irda_task_next_state(task, IRDA_TASK_DONE);
214 self->reset_task = NULL;
215 ret = -1;
216 break;
217 }
218 return ret;
219}
220
221MODULE_AUTHOR("Felix Tang <tangf@eyetap.org>");
222MODULE_DESCRIPTION("Microchip MCP2120");
223MODULE_LICENSE("GPL");
224MODULE_ALIAS("irda-dongle-9"); /* IRDA_MCP2120_DONGLE */
225
226/*
227 * Function init_module (void)
228 *
229 * Initialize MCP2120 module
230 *
231 */
232module_init(mcp2120_init);
233
234/*
235 * Function cleanup_module (void)
236 *
237 * Cleanup MCP2120 module
238 *
239 */
240module_exit(mcp2120_cleanup);