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/drivers/net/irda/act200l-sir.c

http://github.com/mirrors/linux
C | 250 lines | 157 code | 41 blank | 52 comment | 2 complexity | 6b3a680d63da2aefb2b0c70584b2e8e4 MD5 | raw file
  1/*********************************************************************
  2 *
  3 * Filename:      act200l.c
  4 * Version:       0.8
  5 * Description:   Implementation for the ACTiSYS ACT-IR200L dongle
  6 * Status:        Experimental.
  7 * Author:        SHIMIZU Takuya <tshimizu@ga2.so-net.ne.jp>
  8 * Created at:    Fri Aug  3 17:35:42 2001
  9 * Modified at:   Fri Aug 17 10:22:40 2001
 10 * Modified by:   SHIMIZU Takuya <tshimizu@ga2.so-net.ne.jp>
 11 *
 12 *     Copyright (c) 2001 SHIMIZU Takuya, 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/init.h>
 24
 25#include <net/irda/irda.h>
 26
 27#include "sir-dev.h"
 28
 29static int act200l_reset(struct sir_dev *dev);
 30static int act200l_open(struct sir_dev *dev);
 31static int act200l_close(struct sir_dev *dev);
 32static int act200l_change_speed(struct sir_dev *dev, unsigned speed);
 33
 34/* Regsiter 0: Control register #1 */
 35#define ACT200L_REG0    0x00
 36#define ACT200L_TXEN    0x01 /* Enable transmitter */
 37#define ACT200L_RXEN    0x02 /* Enable receiver */
 38
 39/* Register 1: Control register #2 */
 40#define ACT200L_REG1    0x10
 41#define ACT200L_LODB    0x01 /* Load new baud rate count value */
 42#define ACT200L_WIDE    0x04 /* Expand the maximum allowable pulse */
 43
 44/* Register 4: Output Power register */
 45#define ACT200L_REG4    0x40
 46#define ACT200L_OP0     0x01 /* Enable LED1C output */
 47#define ACT200L_OP1     0x02 /* Enable LED2C output */
 48#define ACT200L_BLKR    0x04
 49
 50/* Register 5: Receive Mode register */
 51#define ACT200L_REG5    0x50
 52#define ACT200L_RWIDL   0x01 /* fixed 1.6us pulse mode */
 53
 54/* Register 6: Receive Sensitivity register #1 */
 55#define ACT200L_REG6    0x60
 56#define ACT200L_RS0     0x01 /* receive threshold bit 0 */
 57#define ACT200L_RS1     0x02 /* receive threshold bit 1 */
 58
 59/* Register 7: Receive Sensitivity register #2 */
 60#define ACT200L_REG7    0x70
 61#define ACT200L_ENPOS   0x04 /* Ignore the falling edge */
 62
 63/* Register 8,9: Baud Rate Dvider register #1,#2 */
 64#define ACT200L_REG8    0x80
 65#define ACT200L_REG9    0x90
 66
 67#define ACT200L_2400    0x5f
 68#define ACT200L_9600    0x17
 69#define ACT200L_19200   0x0b
 70#define ACT200L_38400   0x05
 71#define ACT200L_57600   0x03
 72#define ACT200L_115200  0x01
 73
 74/* Register 13: Control register #3 */
 75#define ACT200L_REG13   0xd0
 76#define ACT200L_SHDW    0x01 /* Enable access to shadow registers */
 77
 78/* Register 15: Status register */
 79#define ACT200L_REG15   0xf0
 80
 81/* Register 21: Control register #4 */
 82#define ACT200L_REG21   0x50
 83#define ACT200L_EXCK    0x02 /* Disable clock output driver */
 84#define ACT200L_OSCL    0x04 /* oscillator in low power, medium accuracy mode */
 85
 86static struct dongle_driver act200l = {
 87	.owner		= THIS_MODULE,
 88	.driver_name	= "ACTiSYS ACT-IR200L",
 89	.type		= IRDA_ACT200L_DONGLE,
 90	.open		= act200l_open,
 91	.close		= act200l_close,
 92	.reset		= act200l_reset,
 93	.set_speed	= act200l_change_speed,
 94};
 95
 96static int __init act200l_sir_init(void)
 97{
 98	return irda_register_dongle(&act200l);
 99}
100
101static void __exit act200l_sir_cleanup(void)
102{
103	irda_unregister_dongle(&act200l);
104}
105
106static int act200l_open(struct sir_dev *dev)
107{
108	struct qos_info *qos = &dev->qos;
109
110	/* Power on the dongle */
111	sirdev_set_dtr_rts(dev, TRUE, TRUE);
112
113	/* Set the speeds we can accept */
114	qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
115	qos->min_turn_time.bits = 0x03;
116	irda_qos_bits_to_value(qos);
117
118	/* irda thread waits 50 msec for power settling */
119
120	return 0;
121}
122
123static int act200l_close(struct sir_dev *dev)
124{
125	/* Power off the dongle */
126	sirdev_set_dtr_rts(dev, FALSE, FALSE);
127
128	return 0;
129}
130
131/*
132 * Function act200l_change_speed (dev, speed)
133 *
134 *    Set the speed for the ACTiSYS ACT-IR200L type dongle.
135 *
136 */
137static int act200l_change_speed(struct sir_dev *dev, unsigned speed)
138{
139	u8 control[3];
140	int ret = 0;
141
142	/* Clear DTR and set RTS to enter command mode */
143	sirdev_set_dtr_rts(dev, FALSE, TRUE);
144
145	switch (speed) {
146	default:
147		ret = -EINVAL;
148		/* fall through */
149	case 9600:
150		control[0] = ACT200L_REG8 |  (ACT200L_9600       & 0x0f);
151		control[1] = ACT200L_REG9 | ((ACT200L_9600 >> 4) & 0x0f);
152		break;
153	case 19200:
154		control[0] = ACT200L_REG8 |  (ACT200L_19200       & 0x0f);
155		control[1] = ACT200L_REG9 | ((ACT200L_19200 >> 4) & 0x0f);
156		break;
157	case 38400:
158		control[0] = ACT200L_REG8 |  (ACT200L_38400       & 0x0f);
159		control[1] = ACT200L_REG9 | ((ACT200L_38400 >> 4) & 0x0f);
160		break;
161	case 57600:
162		control[0] = ACT200L_REG8 |  (ACT200L_57600       & 0x0f);
163		control[1] = ACT200L_REG9 | ((ACT200L_57600 >> 4) & 0x0f);
164		break;
165	case 115200:
166		control[0] = ACT200L_REG8 |  (ACT200L_115200       & 0x0f);
167		control[1] = ACT200L_REG9 | ((ACT200L_115200 >> 4) & 0x0f);
168		break;
169	}
170	control[2] = ACT200L_REG1 | ACT200L_LODB | ACT200L_WIDE;
171
172	/* Write control bytes */
173	sirdev_raw_write(dev, control, 3);
174	msleep(5);
175
176	/* Go back to normal mode */
177	sirdev_set_dtr_rts(dev, TRUE, TRUE);
178
179	dev->speed = speed;
180	return ret;
181}
182
183/*
184 * Function act200l_reset (driver)
185 *
186 *    Reset the ACTiSYS ACT-IR200L type dongle.
187 */
188
189#define ACT200L_STATE_WAIT1_RESET	(SIRDEV_STATE_DONGLE_RESET+1)
190#define ACT200L_STATE_WAIT2_RESET	(SIRDEV_STATE_DONGLE_RESET+2)
191
192static int act200l_reset(struct sir_dev *dev)
193{
194	unsigned state = dev->fsm.substate;
195	unsigned delay = 0;
196	static const u8 control[9] = {
197		ACT200L_REG15,
198		ACT200L_REG13 | ACT200L_SHDW,
199		ACT200L_REG21 | ACT200L_EXCK | ACT200L_OSCL,
200		ACT200L_REG13,
201		ACT200L_REG7  | ACT200L_ENPOS,
202		ACT200L_REG6  | ACT200L_RS0  | ACT200L_RS1,
203		ACT200L_REG5  | ACT200L_RWIDL,
204		ACT200L_REG4  | ACT200L_OP0  | ACT200L_OP1 | ACT200L_BLKR,
205		ACT200L_REG0  | ACT200L_TXEN | ACT200L_RXEN
206	};
207	int ret = 0;
208
209	switch (state) {
210	case SIRDEV_STATE_DONGLE_RESET:
211		/* Reset the dongle : set RTS low for 25 ms */
212		sirdev_set_dtr_rts(dev, TRUE, FALSE);
213		state = ACT200L_STATE_WAIT1_RESET;
214		delay = 50;
215		break;
216
217	case ACT200L_STATE_WAIT1_RESET:
218		/* Clear DTR and set RTS to enter command mode */
219		sirdev_set_dtr_rts(dev, FALSE, TRUE);
220
221		udelay(25);			/* better wait for some short while */
222
223		/* Write control bytes */
224		sirdev_raw_write(dev, control, sizeof(control));
225		state = ACT200L_STATE_WAIT2_RESET;
226		delay = 15;
227		break;
228
229	case ACT200L_STATE_WAIT2_RESET:
230		/* Go back to normal mode */
231		sirdev_set_dtr_rts(dev, TRUE, TRUE);
232		dev->speed = 9600;
233		break;
234	default:
235		net_err_ratelimited("%s(), unknown state %d\n",
236				    __func__, state);
237		ret = -1;
238		break;
239	}
240	dev->fsm.substate = state;
241	return (delay > 0) ? delay : ret;
242}
243
244MODULE_AUTHOR("SHIMIZU Takuya <tshimizu@ga2.so-net.ne.jp>");
245MODULE_DESCRIPTION("ACTiSYS ACT-IR200L dongle driver");
246MODULE_LICENSE("GPL");
247MODULE_ALIAS("irda-dongle-10"); /* IRDA_ACT200L_DONGLE */
248
249module_init(act200l_sir_init);
250module_exit(act200l_sir_cleanup);