Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/*
 *    tape device driver for S/390 and zSeries tapes.
 *
 *  S390 and zSeries version
 *    Copyright IBM Corp. 2001
 *    Author(s): Carsten Otte <cotte@de.ibm.com>
 *		 Michael Holzheu <holzheu@de.ibm.com>
 *		 Tuan Ngo-Anh <ngoanh@de.ibm.com>
 *
 * PROCFS Functions
 */
 
#define KMSG_COMPONENT "tape"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
 
#include <linux/module.h>
#include <linux/vmalloc.h>
#include <linux/seq_file.h>
#include <linux/proc_fs.h>
 
#define TAPE_DBF_AREA	tape_core_dbf
 
#include "tape.h"
 
static const char *tape_med_st_verbose[MS_SIZE] =
{
<------>[MS_UNKNOWN] = "UNKNOWN ",
<------>[MS_LOADED] = "LOADED  ",
<------>[MS_UNLOADED] = "UNLOADED"
};
 
/* our proc tapedevices entry */
static struct proc_dir_entry *tape_proc_devices;
 
/*
 * Show function for /proc/tapedevices
 */
static int tape_proc_show(struct seq_file *m, void *v)
{
<------>struct tape_device *device;
<------>struct tape_request *request;
<------>const char *str;
<------>unsigned long n;
 
<------>n = (unsigned long) v - 1;
<------>if (!n) {
<------><------>seq_printf(m, "TapeNo\tBusID      CuType/Model\t"
<------><------><------>"DevType/Model\tBlkSize\tState\tOp\tMedState\n");
<------>}
<------>device = tape_find_device(n);
<------>if (IS_ERR(device))
<------><------>return 0;
<------>spin_lock_irq(get_ccwdev_lock(device->cdev));
<------>seq_printf(m, "%d\t", (int) n);
<------>seq_printf(m, "%-10.10s ", dev_name(&device->cdev->dev));
<------>seq_printf(m, "%04X/", device->cdev->id.cu_type);
<------>seq_printf(m, "%02X\t", device->cdev->id.cu_model);
<------>seq_printf(m, "%04X/", device->cdev->id.dev_type);
<------>seq_printf(m, "%02X\t\t", device->cdev->id.dev_model);
<------>if (device->char_data.block_size == 0)
<------><------>seq_printf(m, "auto\t");
<------>else
<------><------>seq_printf(m, "%i\t", device->char_data.block_size);
<------>if (device->tape_state >= 0 &&
<------>    device->tape_state < TS_SIZE)
<------><------>str = tape_state_verbose[device->tape_state];
<------>else
<------><------>str = "UNKNOWN";
<------>seq_printf(m, "%s\t", str);
<------>if (!list_empty(&device->req_queue)) {
<------><------>request = list_entry(device->req_queue.next,
<------><------><------><------>     struct tape_request, list);
<------><------>str = tape_op_verbose[request->op];
<------>} else
<------><------>str = "---";
<------>seq_printf(m, "%s\t", str);
<------>seq_printf(m, "%s\n", tape_med_st_verbose[device->medium_state]);
<------>spin_unlock_irq(get_ccwdev_lock(device->cdev));
<------>tape_put_device(device);
        return 0;
}
 
static void *tape_proc_start(struct seq_file *m, loff_t *pos)
{
<------>if (*pos >= 256 / TAPE_MINORS_PER_DEV)
<------><------>return NULL;
<------>return (void *)((unsigned long) *pos + 1);
}
 
static void *tape_proc_next(struct seq_file *m, void *v, loff_t *pos)
{
<------>++*pos;
<------>return tape_proc_start(m, pos);
}
 
static void tape_proc_stop(struct seq_file *m, void *v)
{
}
 
static const struct seq_operations tape_proc_seq = {
<------>.start		= tape_proc_start,
<------>.next		= tape_proc_next,
<------>.stop		= tape_proc_stop,
<------>.show		= tape_proc_show,
};
 
/*
 * Initialize procfs stuff on startup
 */
void
tape_proc_init(void)
{
<------>tape_proc_devices = proc_create_seq("tapedevices", 0444, NULL,
<------><------><------><------><------>    &tape_proc_seq);
}
 
/*
 * Cleanup all stuff registered to the procfs
 */
void
tape_proc_cleanup(void)
{
<------>if (tape_proc_devices != NULL)
<------><------>remove_proc_entry ("tapedevices", NULL);
}