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 #include <linux/spinlock.h>
  12
  13 #include <net/irda/irda.h>
  14 #include <net/irda/irda_device.h>
  15
  16 #include <asm/io.h>
  17 #include <asm/hardware.h>
  18
  19 #define MIN_DELAY 25      /* 15 us, but wait a little more to be sure */
  20 #define MAX_DELAY 10000   /* 1 ms */
  21
  22 static void ep7211_ir_open(dongle_t *self, struct qos_info *qos);
  23 static void ep7211_ir_close(dongle_t *self);
  24 static int  ep7211_ir_change_speed(struct irda_task *task);
  25 static int  ep7211_ir_reset(struct irda_task *task);
  26
  27 static DEFINE_SPINLOCK(ep7211_lock);
  28
  29 static struct dongle_reg dongle = {
  30         .type = IRDA_EP7211_IR,
  31         .open = ep7211_ir_open,
  32         .close = ep7211_ir_close,
  33         .reset = ep7211_ir_reset,
  34         .change_speed = ep7211_ir_change_speed,
  35         .owner = THIS_MODULE,
  36 };
  37
  38 static void ep7211_ir_open(dongle_t *self, struct qos_info *qos)
  39 {
  40         unsigned int syscon1, flags;
  41
  42         spin_lock_irqsave(&ep7211_lock, flags);
  43
  44         /* Turn on the SIR encoder. */
  45         syscon1 = clps_readl(SYSCON1);
  46         syscon1 |= SYSCON1_SIREN;
  47         clps_writel(syscon1, SYSCON1);
  48
  49         /* XXX: We should disable modem status interrupts on the first
  50                 UART (interrupt #14). */
  51
  52         spin_unlock_irqrestore(&ep7211_lock, flags);
  53 }
  54
  55 static void ep7211_ir_close(dongle_t *self)
  56 {
  57         unsigned int syscon1, flags;
  58
  59         spin_lock_irqsave(&ep7211_lock, flags);
  60
  61         /* Turn off the SIR encoder. */
  62         syscon1 = clps_readl(SYSCON1);
  63         syscon1 &= ~SYSCON1_SIREN;
  64         clps_writel(syscon1, SYSCON1);
  65
  66         /* XXX: If we've disabled the modem status interrupts, we should
  67                 reset them back to their original state. */
  68
  69         spin_unlock_irqrestore(&ep7211_lock, flags);
  70 }
  71
  72 /*
  73  * Function ep7211_ir_change_speed (task)
  74  *
  75  *    Change speed of the EP7211 I/R port. We don't really have to do anything
  76  *    for the EP7211 as long as the rate is being changed at the serial port
  77  *    level.
  78  */
  79 static int ep7211_ir_change_speed(struct irda_task *task)
  80 {
  81         irda_task_next_state(task, IRDA_TASK_DONE);
  82         return 0;
  83 }
  84
  85 /*
  86  * Function ep7211_ir_reset (task)
  87  *
  88  *      Reset the EP7211 I/R. We don't really have to do anything.
  89  *
  90  */
  91 static int ep7211_ir_reset(struct irda_task *task)
  92 {
  93         irda_task_next_state(task, IRDA_TASK_DONE);
  94         return 0;
  95 }
  96
  97 /*
  98  * Function ep7211_ir_init(void)
  99  *
 100  *    Initialize EP7211 I/R module
 101  *
 102  */
 103 static int __init ep7211_ir_init(void)
 104 {
 105         return irda_device_register_dongle(&dongle);
 106 }
 107
 108 /*
 109  * Function ep7211_ir_cleanup(void)
 110  *
 111  *    Cleanup EP7211 I/R module
 112  *
 113  */
 114 static void __exit ep7211_ir_cleanup(void)
 115 {
 116         irda_device_unregister_dongle(&dongle);
 117 }
 118
 119 MODULE_AUTHOR("Jon McClintock <jonm@bluemug.com>");
 120 MODULE_DESCRIPTION("EP7211 I/R driver");
 121 MODULE_LICENSE("GPL");
 122 MODULE_ALIAS("irda-dongle-8"); /* IRDA_EP7211_IR */
 123
 124 module_init(ep7211_ir_init);
 125 module_exit(ep7211_ir_cleanup);