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![Christoph Hellwig](/assets/img/avatar_default.png)
Variants of proc_create{,_data} that directly take a seq_file show callback and drastically reduces the boilerplate code in the callers. All trivial callers converted over. Signed-off-by: Christoph Hellwig <hch@lst.de>
186 lines
4.6 KiB
C
186 lines
4.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* drivers/nubus/proc.c: Proc FS interface for NuBus.
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By David Huggins-Daines <dhd@debian.org>
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Much code and many ideas from drivers/pci/proc.c:
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Copyright (c) 1997, 1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
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This is initially based on the Zorro and PCI interfaces. However,
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it works somewhat differently. The intent is to provide a
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structure in /proc analogous to the structure of the NuBus ROM
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resources.
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Therefore each board function gets a directory, which may in turn
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contain subdirectories. Each slot resource is a file. Unrecognized
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resources are empty files, since every resource ID requires a special
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case (e.g. if the resource ID implies a directory or block, then its
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value has to be interpreted as a slot ROM pointer etc.).
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/nubus.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/uaccess.h>
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#include <asm/byteorder.h>
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/*
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* /proc/bus/nubus/devices stuff
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*/
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static int
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nubus_devices_proc_show(struct seq_file *m, void *v)
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{
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struct nubus_rsrc *fres;
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for_each_func_rsrc(fres)
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seq_printf(m, "%x\t%04x %04x %04x %04x\t%08lx\n",
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fres->board->slot, fres->category, fres->type,
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fres->dr_sw, fres->dr_hw, fres->board->slot_addr);
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return 0;
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}
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static struct proc_dir_entry *proc_bus_nubus_dir;
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/*
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* /proc/bus/nubus/x/ stuff
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*/
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struct proc_dir_entry *nubus_proc_add_board(struct nubus_board *board)
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{
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char name[2];
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if (!proc_bus_nubus_dir)
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return NULL;
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snprintf(name, sizeof(name), "%x", board->slot);
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return proc_mkdir(name, proc_bus_nubus_dir);
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}
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/* The PDE private data for any directory under /proc/bus/nubus/x/
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* is the bytelanes value for the board in slot x.
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*/
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struct proc_dir_entry *nubus_proc_add_rsrc_dir(struct proc_dir_entry *procdir,
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const struct nubus_dirent *ent,
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struct nubus_board *board)
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{
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char name[9];
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int lanes = board->lanes;
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if (!procdir)
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return NULL;
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snprintf(name, sizeof(name), "%x", ent->type);
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return proc_mkdir_data(name, 0555, procdir, (void *)lanes);
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}
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/* The PDE private data for a file under /proc/bus/nubus/x/ is a pointer to
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* an instance of the following structure, which gives the location and size
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* of the resource data in the slot ROM. For slot resources which hold only a
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* small integer, this integer value is stored directly and size is set to 0.
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* A NULL private data pointer indicates an unrecognized resource.
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*/
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struct nubus_proc_pde_data {
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unsigned char *res_ptr;
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unsigned int res_size;
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};
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static struct nubus_proc_pde_data *
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nubus_proc_alloc_pde_data(unsigned char *ptr, unsigned int size)
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{
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struct nubus_proc_pde_data *pde_data;
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pde_data = kmalloc(sizeof(*pde_data), GFP_KERNEL);
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if (!pde_data)
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return NULL;
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pde_data->res_ptr = ptr;
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pde_data->res_size = size;
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return pde_data;
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}
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static int nubus_proc_rsrc_show(struct seq_file *m, void *v)
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{
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struct inode *inode = m->private;
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struct nubus_proc_pde_data *pde_data;
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pde_data = PDE_DATA(inode);
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if (!pde_data)
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return 0;
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if (pde_data->res_size > m->size)
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return -EFBIG;
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if (pde_data->res_size) {
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int lanes = (int)proc_get_parent_data(inode);
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struct nubus_dirent ent;
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if (!lanes)
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return 0;
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ent.mask = lanes;
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ent.base = pde_data->res_ptr;
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ent.data = 0;
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nubus_seq_write_rsrc_mem(m, &ent, pde_data->res_size);
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} else {
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unsigned int data = (unsigned int)pde_data->res_ptr;
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seq_putc(m, data >> 16);
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seq_putc(m, data >> 8);
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seq_putc(m, data >> 0);
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}
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return 0;
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}
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void nubus_proc_add_rsrc_mem(struct proc_dir_entry *procdir,
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const struct nubus_dirent *ent,
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unsigned int size)
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{
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char name[9];
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struct nubus_proc_pde_data *pde_data;
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if (!procdir)
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return;
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snprintf(name, sizeof(name), "%x", ent->type);
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if (size)
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pde_data = nubus_proc_alloc_pde_data(nubus_dirptr(ent), size);
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else
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pde_data = NULL;
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proc_create_single_data(name, S_IFREG | 0444, procdir,
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nubus_proc_rsrc_show, pde_data);
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}
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void nubus_proc_add_rsrc(struct proc_dir_entry *procdir,
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const struct nubus_dirent *ent)
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{
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char name[9];
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unsigned char *data = (unsigned char *)ent->data;
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if (!procdir)
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return;
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snprintf(name, sizeof(name), "%x", ent->type);
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proc_create_single_data(name, S_IFREG | 0444, procdir,
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nubus_proc_rsrc_show,
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nubus_proc_alloc_pde_data(data, 0));
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}
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/*
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* /proc/nubus stuff
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*/
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void __init nubus_proc_init(void)
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{
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proc_create_single("nubus", 0, NULL, nubus_proc_show);
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proc_bus_nubus_dir = proc_mkdir("bus/nubus", NULL);
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if (!proc_bus_nubus_dir)
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return;
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proc_create_single("devices", 0, proc_bus_nubus_dir,
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nubus_devices_proc_show);
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}
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