1 /*
2 * drivers/s390/char/tape.c
3 * tape device driver for S/390 and zSeries tapes.
4 *
5 * S390 and zSeries version
6 * Copyright (C) 2001 IBM Corporation
7 * Author(s): Carsten Otte <cotte@de.ibm.com>
8 * Michael Holzheu <holzheu@de.ibm.com>
9 * Tuan Ngo-Anh <ngoanh@de.ibm.com>
10 *
11 * PROCFS Functions
12 */
13
14 #include <linux/module.h>
15 #include <linux/vmalloc.h>
16 #include <linux/seq_file.h>
17 #include <linux/proc_fs.h>
18
19 #define TAPE_DBF_AREA tape_core_dbf
20
21 #include "tape.h"
22
23 #define PRINTK_HEADER "TAPE_PROC: "
24
25 static const char *tape_med_st_verbose[MS_SIZE] =
26 {
27 [MS_UNKNOWN] = "UNKNOWN ",
28 [MS_LOADED] = "LOADED ",
29 [MS_UNLOADED] = "UNLOADED"
30 };
31
32 /* our proc tapedevices entry */
33 static struct proc_dir_entry *tape_proc_devices;
34
35 /*
36 * Show function for /proc/tapedevices
37 */
38 static int tape_proc_show(struct seq_file *m, void *v)
39 {
40 struct tape_device *device;
41 struct tape_request *request;
42 const char *str;
43 unsigned long n;
44
45 n = (unsigned long) v - 1;
46 if (!n) {
47 seq_printf(m, "TapeNo\tBusID CuType/Model\t"
48 "DevType/Model\tBlkSize\tState\tOp\tMedState\n");
49 }
50 device = tape_get_device(n);
51 if (IS_ERR(device))
52 return 0;
53 spin_lock_irq(get_ccwdev_lock(device->cdev));
54 seq_printf(m, "%d\t", (int) n);
55 seq_printf(m, "%-10.10s ", device->cdev->dev.bus_id);
56 seq_printf(m, "%04X/", device->cdev->id.cu_type);
57 seq_printf(m, "%02X\t", device->cdev->id.cu_model);
58 seq_printf(m, "%04X/", device->cdev->id.dev_type);
59 seq_printf(m, "%02X\t\t", device->cdev->id.dev_model);
60 if (device->char_data.block_size == 0)
61 seq_printf(m, "auto\t");
62 else
63 seq_printf(m, "%i\t", device->char_data.block_size);
64 if (device->tape_state >= 0 &&
65 device->tape_state < TS_SIZE)
66 str = tape_state_verbose[device->tape_state];
67 else
68 str = "UNKNOWN";
69 seq_printf(m, "%s\t", str);
70 if (!list_empty(&device->req_queue)) {
71 request = list_entry(device->req_queue.next,
72 struct tape_request, list);
73 str = tape_op_verbose[request->op];
74 } else
75 str = "---";
76 seq_printf(m, "%s\t", str);
77 seq_printf(m, "%s\n", tape_med_st_verbose[device->medium_state]);
78 spin_unlock_irq(get_ccwdev_lock(device->cdev));
79 tape_put_device(device);
80 return 0;
81 }
82
83 static void *tape_proc_start(struct seq_file *m, loff_t *pos)
84 {
85 if (*pos >= 256 / TAPE_MINORS_PER_DEV)
86 return NULL;
87 return (void *)((unsigned long) *pos + 1);
88 }
89
90 static void *tape_proc_next(struct seq_file *m, void *v, loff_t *pos)
91 {
92 ++*pos;
93 return tape_proc_start(m, pos);
94 }
95
96 static void tape_proc_stop(struct seq_file *m, void *v)
97 {
98 }
99
100 static const struct seq_operations tape_proc_seq = {
101 .start = tape_proc_start,
102 .next = tape_proc_next,
103 .stop = tape_proc_stop,
104 .show = tape_proc_show,
105 };
106
107 static int tape_proc_open(struct inode *inode, struct file *file)
108 {
109 return seq_open(file, &tape_proc_seq);
110 }
111
112 static const struct file_operations tape_proc_ops =
113 {
114 .open = tape_proc_open,
115 .read = seq_read,
116 .llseek = seq_lseek,
117 .release = seq_release,
118 };
119
120 /*
121 * Initialize procfs stuff on startup
122 */
123 void
124 tape_proc_init(void)
125 {
126 tape_proc_devices =
127 create_proc_entry ("tapedevices", S_IFREG | S_IRUGO | S_IWUSR,
128 &proc_root);
129 if (tape_proc_devices == NULL) {
130 PRINT_WARN("tape: Cannot register procfs entry tapedevices\n");
131 return;
132 }
133 tape_proc_devices->proc_fops = &tape_proc_ops;
134 tape_proc_devices->owner = THIS_MODULE;
135 }
136
137 /*
138 * Cleanup all stuff registered to the procfs
139 */
140 void
141 tape_proc_cleanup(void)
142 {
143 if (tape_proc_devices != NULL)
144 remove_proc_entry ("tapedevices", &proc_root);
145 }
146
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