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/sched.h>
11 #include <linux/init.h>
12
13 #include <net/irda/irda.h>
14 #include <net/irda/irmod.h>
15 #include <net/irda/irda_device.h>
16
17 #include <asm/io.h>
18 #include <asm/hardware.h>
19
20 #define MIN_DELAY 25 /* 15 us, but wait a little more to be sure */
21 #define MAX_DELAY 10000 /* 1 ms */
22
23 static void ep7211_ir_open(dongle_t *self, struct qos_info *qos);
24 static void ep7211_ir_close(dongle_t *self);
25 static int ep7211_ir_change_speed(struct irda_task *task);
26 static int ep7211_ir_reset(struct irda_task *task);
27
28 static struct dongle_reg dongle = {
29 Q_NULL,
30 IRDA_EP7211_IR,
31 ep7211_ir_open,
32 ep7211_ir_close,
33 ep7211_ir_reset,
34 ep7211_ir_change_speed,
35 };
36
ep7211_ir_open(dongle_t * self,struct qos_info * qos)37 static void ep7211_ir_open(dongle_t *self, struct qos_info *qos)
38 {
39 unsigned int syscon1, flags;
40
41 save_flags(flags); cli();
42
43 /* Turn on the SIR encoder. */
44 syscon1 = clps_readl(SYSCON1);
45 syscon1 |= SYSCON1_SIREN;
46 clps_writel(syscon1, SYSCON1);
47
48 /* XXX: We should disable modem status interrupts on the first
49 UART (interrupt #14). */
50
51 restore_flags(flags);
52
53 MOD_INC_USE_COUNT;
54 }
55
ep7211_ir_close(dongle_t * self)56 static void ep7211_ir_close(dongle_t *self)
57 {
58 unsigned int syscon1, flags;
59
60 save_flags(flags); cli();
61
62 /* Turn off the SIR encoder. */
63 syscon1 = clps_readl(SYSCON1);
64 syscon1 &= ~SYSCON1_SIREN;
65 clps_writel(syscon1, SYSCON1);
66
67 /* XXX: If we've disabled the modem status interrupts, we should
68 reset them back to their original state. */
69
70 restore_flags(flags);
71
72 MOD_DEC_USE_COUNT;
73 }
74
75 /*
76 * Function ep7211_ir_change_speed (task)
77 *
78 * Change speed of the EP7211 I/R port. We don't really have to do anything
79 * for the EP7211 as long as the rate is being changed at the serial port
80 * level.
81 */
ep7211_ir_change_speed(struct irda_task * task)82 static int ep7211_ir_change_speed(struct irda_task *task)
83 {
84 irda_task_next_state(task, IRDA_TASK_DONE);
85 return 0;
86 }
87
88 /*
89 * Function ep7211_ir_reset (task)
90 *
91 * Reset the EP7211 I/R. We don't really have to do anything.
92 *
93 */
ep7211_ir_reset(struct irda_task * task)94 static int ep7211_ir_reset(struct irda_task *task)
95 {
96 irda_task_next_state(task, IRDA_TASK_DONE);
97 return 0;
98 }
99
100 /*
101 * Function ep7211_ir_init(void)
102 *
103 * Initialize EP7211 I/R module
104 *
105 */
ep7211_ir_init(void)106 int __init ep7211_ir_init(void)
107 {
108 return irda_device_register_dongle(&dongle);
109 }
110
111 /*
112 * Function ep7211_ir_cleanup(void)
113 *
114 * Cleanup EP7211 I/R module
115 *
116 */
ep7211_ir_cleanup(void)117 static void __exit ep7211_ir_cleanup(void)
118 {
119 irda_device_unregister_dongle(&dongle);
120 }
121
122 MODULE_AUTHOR("Jon McClintock <jonm@bluemug.com>");
123 MODULE_DESCRIPTION("EP7211 I/R driver");
124 MODULE_LICENSE("GPL");
125
126 #ifdef MODULE
127 module_init(ep7211_ir_init);
128 #endif /* MODULE */
129 module_exit(ep7211_ir_cleanup);
130