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 static const char *tape_med_st_verbose[MS_SIZE] =
24 {
25 [MS_UNKNOWN] = "UNKNOWN ",
26 [MS_LOADED] = "LOADED ",
27 [MS_UNLOADED] = "UNLOADED"
28 };
29
30 /* our proc tapedevices entry */
31 static struct proc_dir_entry *tape_proc_devices;
32
33 /*
34 * Show function for /proc/tapedevices
35 */
36 static int tape_proc_show(struct seq_file *m, void *v)
37 {
38 struct tape_device *device;
39 struct tape_request *request;
40 const char *str;
41 unsigned long n;
42
43 n = (unsigned long) v - 1;
44 if (!n) {
45 seq_printf(m, "TapeNo\tBusID CuType/Model\t"
46 "DevType/Model\tBlkSize\tState\tOp\tMedState\n");
47 }
48 device = tape_get_device(n);
49 if (IS_ERR(device))
50 return 0;
51 spin_lock_irq(get_ccwdev_lock(device->cdev));
52 seq_printf(m, "%d\t", (int) n);
53 seq_printf(m, "%-10.10s ", dev_name(&device->cdev->dev));
54 seq_printf(m, "%04X/", device->cdev->id.cu_type);
55 seq_printf(m, "%02X\t", device->cdev->id.cu_model);
56 seq_printf(m, "%04X/", device->cdev->id.dev_type);
57 seq_printf(m, "%02X\t\t", device->cdev->id.dev_model);
58 if (device->char_data.block_size == 0)
59 seq_printf(m, "auto\t");
60 else
61 seq_printf(m, "%i\t", device->char_data.block_size);
62 if (device->tape_state >= 0 &&
63 device->tape_state < TS_SIZE)
64 str = tape_state_verbose[device->tape_state];
65 else
66 str = "UNKNOWN";
67 seq_printf(m, "%s\t", str);
68 if (!list_empty(&device->req_queue)) {
69 request = list_entry(device->req_queue.next,
70 struct tape_request, list);
71 str = tape_op_verbose[request->op];
72 } else
73 str = "---";
74 seq_printf(m, "%s\t", str);
75 seq_printf(m, "%s\n", tape_med_st_verbose[device->medium_state]);
76 spin_unlock_irq(get_ccwdev_lock(device->cdev));
77 tape_put_device(device);
78 return 0;
79 }
80
81 static void *tape_proc_start(struct seq_file *m, loff_t *pos)
82 {
83 if (*pos >= 256 / TAPE_MINORS_PER_DEV)
84 return NULL;
85 return (void *)((unsigned long) *pos + 1);
86 }
87
88 static void *tape_proc_next(struct seq_file *m, void *v, loff_t *pos)
89 {
90 ++*pos;
91 return tape_proc_start(m, pos);
92 }
93
94 static void tape_proc_stop(struct seq_file *m, void *v)
95 {
96 }
97
98 static const struct seq_operations tape_proc_seq = {
99 .start = tape_proc_start,
100 .next = tape_proc_next,
101 .stop = tape_proc_stop,
102 .show = tape_proc_show,
103 };
104
105 static int tape_proc_open(struct inode *inode, struct file *file)
106 {
107 return seq_open(file, &tape_proc_seq);
108 }
109
110 static const struct file_operations tape_proc_ops =
111 {
112 .owner = THIS_MODULE,
113 .open = tape_proc_open,
114 .read = seq_read,
115 .llseek = seq_lseek,
116 .release = seq_release,
117 };
118
119 /*
120 * Initialize procfs stuff on startup
121 */
122 void
123 tape_proc_init(void)
124 {
125 tape_proc_devices =
126 proc_create("tapedevices", S_IFREG | S_IRUGO | S_IWUSR, NULL,
127 &tape_proc_ops);
128 if (tape_proc_devices == NULL) {
129 return;
130 }
131 }
132
133 /*
134 * Cleanup all stuff registered to the procfs
135 */
136 void
137 tape_proc_cleanup(void)
138 {
139 if (tape_proc_devices != NULL)
140 remove_proc_entry ("tapedevices", NULL);
141 }
142
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