1/*
2 *    tape device driver for S/390 and zSeries tapes.
3 *
4 *  S390 and zSeries version
5 *    Copyright IBM Corp. 2001
6 *    Author(s): Carsten Otte <cotte@de.ibm.com>
7 *		 Michael Holzheu <holzheu@de.ibm.com>
8 *		 Tuan Ngo-Anh <ngoanh@de.ibm.com>
9 *
10 * PROCFS Functions
11 */
12
13#define KMSG_COMPONENT "tape"
14#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
15
16#include <linux/module.h>
17#include <linux/vmalloc.h>
18#include <linux/seq_file.h>
19#include <linux/proc_fs.h>
20
21#define TAPE_DBF_AREA	tape_core_dbf
22
23#include "tape.h"
24
25static 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 */
33static struct proc_dir_entry *tape_proc_devices;
34
35/*
36 * Show function for /proc/tapedevices
37 */
38static 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_find_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 ", dev_name(&device->cdev->dev));
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
83static 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
90static 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
96static void tape_proc_stop(struct seq_file *m, void *v)
97{
98}
99
100static 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
107static int tape_proc_open(struct inode *inode, struct file *file)
108{
109	return seq_open(file, &tape_proc_seq);
110}
111
112static const struct file_operations tape_proc_ops =
113{
114	.owner		= THIS_MODULE,
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 */
124void
125tape_proc_init(void)
126{
127	tape_proc_devices =
128		proc_create("tapedevices", S_IFREG | S_IRUGO | S_IWUSR, NULL,
129			    &tape_proc_ops);
130	if (tape_proc_devices == NULL) {
131		return;
132	}
133}
134
135/*
136 * Cleanup all stuff registered to the procfs
137 */
138void
139tape_proc_cleanup(void)
140{
141	if (tape_proc_devices != NULL)
142		remove_proc_entry ("tapedevices", NULL);
143}
144