/home/lenb/linux-2.6 branch 'acpi-2.6.12'
[linux-2.6] / drivers / s390 / char / tape_proc.c
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/config.h>
15 #include <linux/module.h>
16 #include <linux/vmalloc.h>
17 #include <linux/seq_file.h>
18 #include <linux/proc_fs.h>
19
20 #define TAPE_DBF_AREA   tape_core_dbf
21
22 #include "tape.h"
23
24 #define PRINTK_HEADER "TAPE_PROC: "
25
26 static const char *tape_med_st_verbose[MS_SIZE] =
27 {
28         [MS_UNKNOWN] = "UNKNOWN ",
29         [MS_LOADED] = "LOADED  ",
30         [MS_UNLOADED] = "UNLOADED"
31 };
32
33 /* our proc tapedevices entry */
34 static struct proc_dir_entry *tape_proc_devices;
35
36 /*
37  * Show function for /proc/tapedevices
38  */
39 static int tape_proc_show(struct seq_file *m, void *v)
40 {
41         struct tape_device *device;
42         struct tape_request *request;
43         const char *str;
44         unsigned long n;
45
46         n = (unsigned long) v - 1;
47         if (!n) {
48                 seq_printf(m, "TapeNo\tBusID      CuType/Model\t"
49                         "DevType/Model\tBlkSize\tState\tOp\tMedState\n");
50         }
51         device = tape_get_device(n);
52         if (IS_ERR(device))
53                 return 0;
54         spin_lock_irq(get_ccwdev_lock(device->cdev));
55         seq_printf(m, "%d\t", (int) n);
56         seq_printf(m, "%-10.10s ", device->cdev->dev.bus_id);
57         seq_printf(m, "%04X/", device->cdev->id.cu_type);
58         seq_printf(m, "%02X\t", device->cdev->id.cu_model);
59         seq_printf(m, "%04X/", device->cdev->id.dev_type);
60         seq_printf(m, "%02X\t\t", device->cdev->id.dev_model);
61         if (device->char_data.block_size == 0)
62                 seq_printf(m, "auto\t");
63         else
64                 seq_printf(m, "%i\t", device->char_data.block_size);
65         if (device->tape_state >= 0 &&
66             device->tape_state < TS_SIZE)
67                 str = tape_state_verbose[device->tape_state];
68         else
69                 str = "UNKNOWN";
70         seq_printf(m, "%s\t", str);
71         if (!list_empty(&device->req_queue)) {
72                 request = list_entry(device->req_queue.next,
73                                      struct tape_request, list);
74                 str = tape_op_verbose[request->op];
75         } else
76                 str = "---";
77         seq_printf(m, "%s\t", str);
78         seq_printf(m, "%s\n", tape_med_st_verbose[device->medium_state]);
79         spin_unlock_irq(get_ccwdev_lock(device->cdev));
80         tape_put_device(device);
81         return 0;
82 }
83
84 static void *tape_proc_start(struct seq_file *m, loff_t *pos)
85 {
86         if (*pos >= 256 / TAPE_MINORS_PER_DEV)
87                 return NULL;
88         return (void *)((unsigned long) *pos + 1);
89 }
90
91 static void *tape_proc_next(struct seq_file *m, void *v, loff_t *pos)
92 {
93         ++*pos;
94         return tape_proc_start(m, pos);
95 }
96
97 static void tape_proc_stop(struct seq_file *m, void *v)
98 {
99 }
100
101 static struct seq_operations tape_proc_seq = {
102         .start          = tape_proc_start,
103         .next           = tape_proc_next,
104         .stop           = tape_proc_stop,
105         .show           = tape_proc_show,
106 };
107
108 static int tape_proc_open(struct inode *inode, struct file *file)
109 {
110         return seq_open(file, &tape_proc_seq);
111 }
112
113 static struct file_operations tape_proc_ops =
114 {
115         .open           = tape_proc_open,
116         .read           = seq_read,
117         .llseek         = seq_lseek,
118         .release        = seq_release,
119 };
120
121 /*
122  * Initialize procfs stuff on startup
123  */
124 void
125 tape_proc_init(void)
126 {
127         tape_proc_devices =
128                 create_proc_entry ("tapedevices", S_IFREG | S_IRUGO | S_IWUSR,
129                                    &proc_root);
130         if (tape_proc_devices == NULL) {
131                 PRINT_WARN("tape: Cannot register procfs entry tapedevices\n");
132                 return;
133         }
134         tape_proc_devices->proc_fops = &tape_proc_ops;
135         tape_proc_devices->owner = THIS_MODULE;
136 }
137
138 /*
139  * Cleanup all stuff registered to the procfs
140  */
141 void
142 tape_proc_cleanup(void)
143 {
144         if (tape_proc_devices != NULL)
145                 remove_proc_entry ("tapedevices", &proc_root);
146 }