drivers/net/irda/ep7211_ir.c

   1 /*
   2  * IR port driver for the Cirrus Logic EP7211 processor.
   3  *
   4  * Copyright 2001, Blue Mug Inc.  All rights reserved.
   5  */
   6
   7 #include <linux/module.h>
   8 #include <linux/delay.h>
   9 #include <linux/tty.h>
  10 #include <linux/init.h>
  11
  12 #include <net/irda/irda.h>
  13 #include <net/irda/irda_device.h>
  14
  15 #include <asm/io.h>
  16 #include <asm/hardware.h>
  17
  18 #define MIN_DELAY 25      /* 15 us, but wait a little more to be sure */
  19 #define MAX_DELAY 10000   /* 1 ms */
  20
  21 static void ep7211_ir_open(dongle_t *self, struct qos_info *qos);
  22 static void ep7211_ir_close(dongle_t *self);
  23 static int  ep7211_ir_change_speed(struct irda_task *task);
  24 static int  ep7211_ir_reset(struct irda_task *task);
  25
  26 static struct dongle_reg dongle = {
  27         .type = IRDA_EP7211_IR,
  28         .open = ep7211_ir_open,
  29         .close = ep7211_ir_close,
  30         .reset = ep7211_ir_reset,
  31         .change_speed = ep7211_ir_change_speed,
  32         .owner = THIS_MODULE,
  33 };
  34
  35 static void ep7211_ir_open(dongle_t *self, struct qos_info *qos)
  36 {
  37         unsigned int syscon1, flags;
  38
  39         save_flags(flags); cli();
  40
  41         /* Turn on the SIR encoder. */
  42         syscon1 = clps_readl(SYSCON1);
  43         syscon1 |= SYSCON1_SIREN;
  44         clps_writel(syscon1, SYSCON1);
  45
  46         /* XXX: We should disable modem status interrupts on the first
  47                 UART (interrupt #14). */
  48
  49         restore_flags(flags);
  50 }
  51
  52 static void ep7211_ir_close(dongle_t *self)
  53 {
  54         unsigned int syscon1, flags;
  55
  56         save_flags(flags); cli();
  57
  58         /* Turn off the SIR encoder. */
  59         syscon1 = clps_readl(SYSCON1);
  60         syscon1 &= ~SYSCON1_SIREN;
  61         clps_writel(syscon1, SYSCON1);
  62
  63         /* XXX: If we've disabled the modem status interrupts, we should
  64                 reset them back to their original state. */
  65
  66         restore_flags(flags);
  67 }
  68
  69 /*
  70  * Function ep7211_ir_change_speed (task)
  71  *
  72  *    Change speed of the EP7211 I/R port. We don't really have to do anything
  73  *    for the EP7211 as long as the rate is being changed at the serial port
  74  *    level.
  75  */
  76 static int ep7211_ir_change_speed(struct irda_task *task)
  77 {
  78         irda_task_next_state(task, IRDA_TASK_DONE);
  79         return 0;
  80 }
  81
  82 /*
  83  * Function ep7211_ir_reset (task)
  84  *
  85  *      Reset the EP7211 I/R. We don't really have to do anything.
  86  *
  87  */
  88 static int ep7211_ir_reset(struct irda_task *task)
  89 {
  90         irda_task_next_state(task, IRDA_TASK_DONE);
  91         return 0;
  92 }
  93
  94 /*
  95  * Function ep7211_ir_init(void)
  96  *
  97  *    Initialize EP7211 I/R module
  98  *
  99  */
 100 static int __init ep7211_ir_init(void)
 101 {
 102         return irda_device_register_dongle(&dongle);
 103 }
 104
 105 /*
 106  * Function ep7211_ir_cleanup(void)
 107  *
 108  *    Cleanup EP7211 I/R module
 109  *
 110  */
 111 static void __exit ep7211_ir_cleanup(void)
 112 {
 113         irda_device_unregister_dongle(&dongle);
 114 }
 115
 116 MODULE_AUTHOR("Jon McClintock <jonm@bluemug.com>");
 117 MODULE_DESCRIPTION("EP7211 I/R driver");
 118 MODULE_LICENSE("GPL");
 119 MODULE_ALIAS("irda-dongle-8"); /* IRDA_EP7211_IR */
 120
 121 module_init(ep7211_ir_init);
 122 module_exit(ep7211_ir_cleanup);