Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
This commit is contained in:
Linus Torvalds
735
drivers/parisc/pdc_stable.c
Normal file
735
drivers/parisc/pdc_stable.c
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@@ -0,0 +1,735 @@
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/*
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* Interfaces to retrieve and set PDC Stable options (firmware)
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*
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* Copyright (C) 2005 Thibaut VARENE <varenet@parisc-linux.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*
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* DEV NOTE: the PDC Procedures reference states that:
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* "A minimum of 96 bytes of Stable Storage is required. Providing more than
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* 96 bytes of Stable Storage is optional [...]. Failure to provide the
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* optional locations from 96 to 192 results in the loss of certain
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* functionality during boot."
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*
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* Since locations between 96 and 192 are the various paths, most (if not
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* all) PA-RISC machines should have them. Anyway, for safety reasons, the
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* following code can deal with only 96 bytes of Stable Storage, and all
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* sizes between 96 and 192 bytes (provided they are multiple of struct
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* device_path size, eg: 128, 160 and 192) to provide full information.
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* The code makes no use of data above 192 bytes. One last word: there's one
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* path we can always count on: the primary path.
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*/
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#undef PDCS_DEBUG
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#ifdef PDCS_DEBUG
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#define DPRINTK(fmt, args...) printk(KERN_DEBUG fmt, ## args)
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#else
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#define DPRINTK(fmt, args...)
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#endif
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/sched.h> /* for capable() */
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/ctype.h>
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#include <linux/sysfs.h>
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#include <linux/kobject.h>
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <asm/pdc.h>
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#include <asm/page.h>
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#include <asm/uaccess.h>
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#include <asm/hardware.h>
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#define PDCS_VERSION "0.09"
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#define PDCS_ADDR_PPRI 0x00
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#define PDCS_ADDR_OSID 0x40
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#define PDCS_ADDR_FSIZ 0x5C
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#define PDCS_ADDR_PCON 0x60
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#define PDCS_ADDR_PALT 0x80
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#define PDCS_ADDR_PKBD 0xA0
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MODULE_AUTHOR("Thibaut VARENE <varenet@parisc-linux.org>");
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MODULE_DESCRIPTION("sysfs interface to HP PDC Stable Storage data");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(PDCS_VERSION);
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static unsigned long pdcs_size = 0;
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/* This struct defines what we need to deal with a parisc pdc path entry */
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struct pdcspath_entry {
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short ready; /* entry record is valid if != 0 */
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unsigned long addr; /* entry address in stable storage */
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char *name; /* entry name */
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struct device_path devpath; /* device path in parisc representation */
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struct device *dev; /* corresponding device */
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struct kobject kobj;
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};
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struct pdcspath_attribute {
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struct attribute attr;
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ssize_t (*show)(struct pdcspath_entry *entry, char *buf);
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ssize_t (*store)(struct pdcspath_entry *entry, const char *buf, size_t count);
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};
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#define PDCSPATH_ENTRY(_addr, _name) \
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struct pdcspath_entry pdcspath_entry_##_name = { \
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.ready = 0, \
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.addr = _addr, \
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.name = __stringify(_name), \
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};
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#define PDCS_ATTR(_name, _mode, _show, _store) \
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struct subsys_attribute pdcs_attr_##_name = { \
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.attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE}, \
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.show = _show, \
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.store = _store, \
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};
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#define PATHS_ATTR(_name, _mode, _show, _store) \
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struct pdcspath_attribute paths_attr_##_name = { \
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.attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE}, \
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.show = _show, \
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.store = _store, \
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};
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#define to_pdcspath_attribute(_attr) container_of(_attr, struct pdcspath_attribute, attr)
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#define to_pdcspath_entry(obj) container_of(obj, struct pdcspath_entry, kobj)
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/**
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* pdcspath_fetch - This function populates the path entry structs.
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* @entry: A pointer to an allocated pdcspath_entry.
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*
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* The general idea is that you don't read from the Stable Storage every time
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* you access the files provided by the facilites. We store a copy of the
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* content of the stable storage WRT various paths in these structs. We read
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* these structs when reading the files, and we will write to these structs when
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* writing to the files, and only then write them back to the Stable Storage.
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*/
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static int
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pdcspath_fetch(struct pdcspath_entry *entry)
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{
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struct device_path *devpath;
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if (!entry)
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return -EINVAL;
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devpath = &entry->devpath;
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DPRINTK("%s: fetch: 0x%p, 0x%p, addr: 0x%lx\n", __func__,
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entry, devpath, entry->addr);
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/* addr, devpath and count must be word aligned */
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if (pdc_stable_read(entry->addr, devpath, sizeof(*devpath)) != PDC_OK)
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return -EIO;
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/* Find the matching device.
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NOTE: hardware_path overlays with device_path, so the nice cast can
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be used */
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entry->dev = hwpath_to_device((struct hardware_path *)devpath);
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entry->ready = 1;
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DPRINTK("%s: device: 0x%p\n", __func__, entry->dev);
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return 0;
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}
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/**
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* pdcspath_store - This function writes a path to stable storage.
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* @entry: A pointer to an allocated pdcspath_entry.
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*
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* It can be used in two ways: either by passing it a preset devpath struct
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* containing an already computed hardware path, or by passing it a device
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* pointer, from which it'll find out the corresponding hardware path.
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* For now we do not handle the case where there's an error in writing to the
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* Stable Storage area, so you'd better not mess up the data :P
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*/
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static int
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pdcspath_store(struct pdcspath_entry *entry)
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{
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struct device_path *devpath;
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if (!entry)
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return -EINVAL;
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devpath = &entry->devpath;
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/* We expect the caller to set the ready flag to 0 if the hardware
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path struct provided is invalid, so that we know we have to fill it.
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First case, we don't have a preset hwpath... */
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if (!entry->ready) {
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/* ...but we have a device, map it */
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if (entry->dev)
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device_to_hwpath(entry->dev, (struct hardware_path *)devpath);
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else
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return -EINVAL;
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}
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/* else, we expect the provided hwpath to be valid. */
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DPRINTK("%s: store: 0x%p, 0x%p, addr: 0x%lx\n", __func__,
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entry, devpath, entry->addr);
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/* addr, devpath and count must be word aligned */
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if (pdc_stable_write(entry->addr, devpath, sizeof(*devpath)) != PDC_OK) {
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printk(KERN_ERR "%s: an error occured when writing to PDC.\n"
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"It is likely that the Stable Storage data has been corrupted.\n"
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"Please check it carefully upon next reboot.\n", __func__);
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return -EIO;
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}
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entry->ready = 1;
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DPRINTK("%s: device: 0x%p\n", __func__, entry->dev);
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return 0;
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}
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/**
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* pdcspath_hwpath_read - This function handles hardware path pretty printing.
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* @entry: An allocated and populated pdscpath_entry struct.
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* @buf: The output buffer to write to.
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*
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* We will call this function to format the output of the hwpath attribute file.
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*/
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static ssize_t
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pdcspath_hwpath_read(struct pdcspath_entry *entry, char *buf)
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{
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char *out = buf;
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struct device_path *devpath;
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unsigned short i;
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if (!entry || !buf)
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return -EINVAL;
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devpath = &entry->devpath;
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if (!entry->ready)
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return -ENODATA;
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for (i = 0; i < 6; i++) {
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if (devpath->bc[i] >= 128)
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continue;
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out += sprintf(out, "%u/", (unsigned char)devpath->bc[i]);
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}
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out += sprintf(out, "%u\n", (unsigned char)devpath->mod);
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return out - buf;
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}
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/**
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* pdcspath_hwpath_write - This function handles hardware path modifying.
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* @entry: An allocated and populated pdscpath_entry struct.
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* @buf: The input buffer to read from.
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* @count: The number of bytes to be read.
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*
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* We will call this function to change the current hardware path.
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* Hardware paths are to be given '/'-delimited, without brackets.
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* We take care to make sure that the provided path actually maps to an existing
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* device, BUT nothing would prevent some foolish user to set the path to some
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* PCI bridge or even a CPU...
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* A better work around would be to make sure we are at the end of a device tree
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* for instance, but it would be IMHO beyond the simple scope of that driver.
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* The aim is to provide a facility. Data correctness is left to userland.
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*/
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static ssize_t
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pdcspath_hwpath_write(struct pdcspath_entry *entry, const char *buf, size_t count)
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{
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struct hardware_path hwpath;
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unsigned short i;
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char in[count+1], *temp;
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struct device *dev;
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if (!entry || !buf || !count)
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return -EINVAL;
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/* We'll use a local copy of buf */
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memset(in, 0, count+1);
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strncpy(in, buf, count);
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/* Let's clean up the target. 0xff is a blank pattern */
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memset(&hwpath, 0xff, sizeof(hwpath));
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/* First, pick the mod field (the last one of the input string) */
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if (!(temp = strrchr(in, '/')))
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return -EINVAL;
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hwpath.mod = simple_strtoul(temp+1, NULL, 10);
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in[temp-in] = '\0'; /* truncate the remaining string. just precaution */
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DPRINTK("%s: mod: %d\n", __func__, hwpath.mod);
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/* Then, loop for each delimiter, making sure we don't have too many.
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we write the bc fields in a down-top way. No matter what, we stop
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before writing the last field. If there are too many fields anyway,
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then the user is a moron and it'll be caught up later when we'll
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check the consistency of the given hwpath. */
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for (i=5; ((temp = strrchr(in, '/'))) && (temp-in > 0) && (likely(i)); i--) {
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hwpath.bc[i] = simple_strtoul(temp+1, NULL, 10);
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in[temp-in] = '\0';
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DPRINTK("%s: bc[%d]: %d\n", __func__, i, hwpath.bc[i]);
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}
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/* Store the final field */
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hwpath.bc[i] = simple_strtoul(in, NULL, 10);
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DPRINTK("%s: bc[%d]: %d\n", __func__, i, hwpath.bc[i]);
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/* Now we check that the user isn't trying to lure us */
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if (!(dev = hwpath_to_device((struct hardware_path *)&hwpath))) {
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printk(KERN_WARNING "%s: attempt to set invalid \"%s\" "
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"hardware path: %s\n", __func__, entry->name, buf);
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return -EINVAL;
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}
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/* So far so good, let's get in deep */
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entry->ready = 0;
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entry->dev = dev;
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/* Now, dive in. Write back to the hardware */
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WARN_ON(pdcspath_store(entry)); /* this warn should *NEVER* happen */
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/* Update the symlink to the real device */
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sysfs_remove_link(&entry->kobj, "device");
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sysfs_create_link(&entry->kobj, &entry->dev->kobj, "device");
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printk(KERN_INFO "PDC Stable Storage: changed \"%s\" path to \"%s\"\n",
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entry->name, buf);
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return count;
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}
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/**
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* pdcspath_layer_read - Extended layer (eg. SCSI ids) pretty printing.
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* @entry: An allocated and populated pdscpath_entry struct.
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* @buf: The output buffer to write to.
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*
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* We will call this function to format the output of the layer attribute file.
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*/
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static ssize_t
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pdcspath_layer_read(struct pdcspath_entry *entry, char *buf)
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{
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char *out = buf;
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struct device_path *devpath;
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unsigned short i;
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||||
|
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if (!entry || !buf)
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return -EINVAL;
|
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devpath = &entry->devpath;
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if (!entry->ready)
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return -ENODATA;
|
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for (i = 0; devpath->layers[i] && (likely(i < 6)); i++)
|
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out += sprintf(out, "%u ", devpath->layers[i]);
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out += sprintf(out, "\n");
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||||
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return out - buf;
|
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}
|
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|
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/**
|
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* pdcspath_layer_write - This function handles extended layer modifying.
|
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* @entry: An allocated and populated pdscpath_entry struct.
|
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* @buf: The input buffer to read from.
|
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* @count: The number of bytes to be read.
|
||||
*
|
||||
* We will call this function to change the current layer value.
|
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* Layers are to be given '.'-delimited, without brackets.
|
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* XXX beware we are far less checky WRT input data provided than for hwpath.
|
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* Potential harm can be done, since there's no way to check the validity of
|
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* the layer fields.
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*/
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static ssize_t
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pdcspath_layer_write(struct pdcspath_entry *entry, const char *buf, size_t count)
|
||||
{
|
||||
unsigned int layers[6]; /* device-specific info (ctlr#, unit#, ...) */
|
||||
unsigned short i;
|
||||
char in[count+1], *temp;
|
||||
|
||||
if (!entry || !buf || !count)
|
||||
return -EINVAL;
|
||||
|
||||
/* We'll use a local copy of buf */
|
||||
memset(in, 0, count+1);
|
||||
strncpy(in, buf, count);
|
||||
|
||||
/* Let's clean up the target. 0 is a blank pattern */
|
||||
memset(&layers, 0, sizeof(layers));
|
||||
|
||||
/* First, pick the first layer */
|
||||
if (unlikely(!isdigit(*in)))
|
||||
return -EINVAL;
|
||||
layers[0] = simple_strtoul(in, NULL, 10);
|
||||
DPRINTK("%s: layer[0]: %d\n", __func__, layers[0]);
|
||||
|
||||
temp = in;
|
||||
for (i=1; ((temp = strchr(temp, '.'))) && (likely(i<6)); i++) {
|
||||
if (unlikely(!isdigit(*(++temp))))
|
||||
return -EINVAL;
|
||||
layers[i] = simple_strtoul(temp, NULL, 10);
|
||||
DPRINTK("%s: layer[%d]: %d\n", __func__, i, layers[i]);
|
||||
}
|
||||
|
||||
/* So far so good, let's get in deep */
|
||||
|
||||
/* First, overwrite the current layers with the new ones, not touching
|
||||
the hardware path. */
|
||||
memcpy(&entry->devpath.layers, &layers, sizeof(layers));
|
||||
|
||||
/* Now, dive in. Write back to the hardware */
|
||||
WARN_ON(pdcspath_store(entry)); /* this warn should *NEVER* happen */
|
||||
|
||||
printk(KERN_INFO "PDC Stable Storage: changed \"%s\" layers to \"%s\"\n",
|
||||
entry->name, buf);
|
||||
|
||||
return count;
|
||||
}
|
||||
|
||||
/**
|
||||
* pdcspath_attr_show - Generic read function call wrapper.
|
||||
* @kobj: The kobject to get info from.
|
||||
* @attr: The attribute looked upon.
|
||||
* @buf: The output buffer.
|
||||
*/
|
||||
static ssize_t
|
||||
pdcspath_attr_show(struct kobject *kobj, struct attribute *attr, char *buf)
|
||||
{
|
||||
struct pdcspath_entry *entry = to_pdcspath_entry(kobj);
|
||||
struct pdcspath_attribute *pdcs_attr = to_pdcspath_attribute(attr);
|
||||
ssize_t ret = 0;
|
||||
|
||||
if (!capable(CAP_SYS_ADMIN))
|
||||
return -EACCES;
|
||||
|
||||
if (pdcs_attr->show)
|
||||
ret = pdcs_attr->show(entry, buf);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* pdcspath_attr_store - Generic write function call wrapper.
|
||||
* @kobj: The kobject to write info to.
|
||||
* @attr: The attribute to be modified.
|
||||
* @buf: The input buffer.
|
||||
* @count: The size of the buffer.
|
||||
*/
|
||||
static ssize_t
|
||||
pdcspath_attr_store(struct kobject *kobj, struct attribute *attr,
|
||||
const char *buf, size_t count)
|
||||
{
|
||||
struct pdcspath_entry *entry = to_pdcspath_entry(kobj);
|
||||
struct pdcspath_attribute *pdcs_attr = to_pdcspath_attribute(attr);
|
||||
ssize_t ret = 0;
|
||||
|
||||
if (!capable(CAP_SYS_ADMIN))
|
||||
return -EACCES;
|
||||
|
||||
if (pdcs_attr->store)
|
||||
ret = pdcs_attr->store(entry, buf, count);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static struct sysfs_ops pdcspath_attr_ops = {
|
||||
.show = pdcspath_attr_show,
|
||||
.store = pdcspath_attr_store,
|
||||
};
|
||||
|
||||
/* These are the two attributes of any PDC path. */
|
||||
static PATHS_ATTR(hwpath, 0600, pdcspath_hwpath_read, pdcspath_hwpath_write);
|
||||
static PATHS_ATTR(layer, 0600, pdcspath_layer_read, pdcspath_layer_write);
|
||||
|
||||
static struct attribute *paths_subsys_attrs[] = {
|
||||
&paths_attr_hwpath.attr,
|
||||
&paths_attr_layer.attr,
|
||||
NULL,
|
||||
};
|
||||
|
||||
/* Specific kobject type for our PDC paths */
|
||||
static struct kobj_type ktype_pdcspath = {
|
||||
.sysfs_ops = &pdcspath_attr_ops,
|
||||
.default_attrs = paths_subsys_attrs,
|
||||
};
|
||||
|
||||
/* We hard define the 4 types of path we expect to find */
|
||||
static PDCSPATH_ENTRY(PDCS_ADDR_PPRI, primary);
|
||||
static PDCSPATH_ENTRY(PDCS_ADDR_PCON, console);
|
||||
static PDCSPATH_ENTRY(PDCS_ADDR_PALT, alternative);
|
||||
static PDCSPATH_ENTRY(PDCS_ADDR_PKBD, keyboard);
|
||||
|
||||
/* An array containing all PDC paths we will deal with */
|
||||
static struct pdcspath_entry *pdcspath_entries[] = {
|
||||
&pdcspath_entry_primary,
|
||||
&pdcspath_entry_alternative,
|
||||
&pdcspath_entry_console,
|
||||
&pdcspath_entry_keyboard,
|
||||
NULL,
|
||||
};
|
||||
|
||||
/**
|
||||
* pdcs_info_read - Pretty printing of the remaining useful data.
|
||||
* @entry: An allocated and populated subsytem struct. We don't use it tho.
|
||||
* @buf: The output buffer to write to.
|
||||
*
|
||||
* We will call this function to format the output of the 'info' attribute file.
|
||||
* Please refer to PDC Procedures documentation, section PDC_STABLE to get a
|
||||
* better insight of what we're doing here.
|
||||
*/
|
||||
static ssize_t
|
||||
pdcs_info_read(struct subsystem *entry, char *buf)
|
||||
{
|
||||
char *out = buf;
|
||||
__u32 result;
|
||||
struct device_path devpath;
|
||||
char *tmpstr = NULL;
|
||||
|
||||
if (!entry || !buf)
|
||||
return -EINVAL;
|
||||
|
||||
/* show the size of the stable storage */
|
||||
out += sprintf(out, "Stable Storage size: %ld bytes\n", pdcs_size);
|
||||
|
||||
/* deal with flags */
|
||||
if (pdc_stable_read(PDCS_ADDR_PPRI, &devpath, sizeof(devpath)) != PDC_OK)
|
||||
return -EIO;
|
||||
|
||||
out += sprintf(out, "Autoboot: %s\n", (devpath.flags & PF_AUTOBOOT) ? "On" : "Off");
|
||||
out += sprintf(out, "Autosearch: %s\n", (devpath.flags & PF_AUTOSEARCH) ? "On" : "Off");
|
||||
out += sprintf(out, "Timer: %u s\n", (devpath.flags & PF_TIMER) ? (1 << (devpath.flags & PF_TIMER)) : 0);
|
||||
|
||||
/* get OSID */
|
||||
if (pdc_stable_read(PDCS_ADDR_OSID, &result, sizeof(result)) != PDC_OK)
|
||||
return -EIO;
|
||||
|
||||
/* the actual result is 16 bits away */
|
||||
switch (result >> 16) {
|
||||
case 0x0000: tmpstr = "No OS-dependent data"; break;
|
||||
case 0x0001: tmpstr = "HP-UX dependent data"; break;
|
||||
case 0x0002: tmpstr = "MPE-iX dependent data"; break;
|
||||
case 0x0003: tmpstr = "OSF dependent data"; break;
|
||||
case 0x0004: tmpstr = "HP-RT dependent data"; break;
|
||||
case 0x0005: tmpstr = "Novell Netware dependent data"; break;
|
||||
default: tmpstr = "Unknown"; break;
|
||||
}
|
||||
out += sprintf(out, "OS ID: %s (0x%.4x)\n", tmpstr, (result >> 16));
|
||||
|
||||
/* get fast-size */
|
||||
if (pdc_stable_read(PDCS_ADDR_FSIZ, &result, sizeof(result)) != PDC_OK)
|
||||
return -EIO;
|
||||
|
||||
out += sprintf(out, "Memory tested: ");
|
||||
if ((result & 0x0F) < 0x0E)
|
||||
out += sprintf(out, "%.3f MB", 0.256*(1<<(result & 0x0F)));
|
||||
else
|
||||
out += sprintf(out, "All");
|
||||
out += sprintf(out, "\n");
|
||||
|
||||
return out - buf;
|
||||
}
|
||||
|
||||
/**
|
||||
* pdcs_info_write - This function handles boot flag modifying.
|
||||
* @entry: An allocated and populated subsytem struct. We don't use it tho.
|
||||
* @buf: The input buffer to read from.
|
||||
* @count: The number of bytes to be read.
|
||||
*
|
||||
* We will call this function to change the current boot flags.
|
||||
* We expect a precise syntax:
|
||||
* \"n n\" (n == 0 or 1) to toggle respectively AutoBoot and AutoSearch
|
||||
*
|
||||
* As of now there is no incentive on my side to provide more "knobs" to that
|
||||
* interface, since modifying the rest of the data is pretty meaningless when
|
||||
* the machine is running and for the expected use of that facility, such as
|
||||
* PALO setting up the boot disk when installing a Linux distribution...
|
||||
*/
|
||||
static ssize_t
|
||||
pdcs_info_write(struct subsystem *entry, const char *buf, size_t count)
|
||||
{
|
||||
struct pdcspath_entry *pathentry;
|
||||
unsigned char flags;
|
||||
char in[count+1], *temp;
|
||||
char c;
|
||||
|
||||
if (!capable(CAP_SYS_ADMIN))
|
||||
return -EACCES;
|
||||
|
||||
if (!entry || !buf || !count)
|
||||
return -EINVAL;
|
||||
|
||||
/* We'll use a local copy of buf */
|
||||
memset(in, 0, count+1);
|
||||
strncpy(in, buf, count);
|
||||
|
||||
/* Current flags are stored in primary boot path entry */
|
||||
pathentry = &pdcspath_entry_primary;
|
||||
|
||||
/* Be nice to the existing flag record */
|
||||
flags = pathentry->devpath.flags;
|
||||
|
||||
DPRINTK("%s: flags before: 0x%X\n", __func__, flags);
|
||||
|
||||
temp = in;
|
||||
|
||||
while (*temp && isspace(*temp))
|
||||
temp++;
|
||||
|
||||
c = *temp++ - '0';
|
||||
if ((c != 0) && (c != 1))
|
||||
goto parse_error;
|
||||
if (c == 0)
|
||||
flags &= ~PF_AUTOBOOT;
|
||||
else
|
||||
flags |= PF_AUTOBOOT;
|
||||
|
||||
if (*temp++ != ' ')
|
||||
goto parse_error;
|
||||
|
||||
c = *temp++ - '0';
|
||||
if ((c != 0) && (c != 1))
|
||||
goto parse_error;
|
||||
if (c == 0)
|
||||
flags &= ~PF_AUTOSEARCH;
|
||||
else
|
||||
flags |= PF_AUTOSEARCH;
|
||||
|
||||
DPRINTK("%s: flags after: 0x%X\n", __func__, flags);
|
||||
|
||||
/* So far so good, let's get in deep */
|
||||
|
||||
/* Change the path entry flags first */
|
||||
pathentry->devpath.flags = flags;
|
||||
|
||||
/* Now, dive in. Write back to the hardware */
|
||||
WARN_ON(pdcspath_store(pathentry)); /* this warn should *NEVER* happen */
|
||||
|
||||
printk(KERN_INFO "PDC Stable Storage: changed flags to \"%s\"\n", buf);
|
||||
|
||||
return count;
|
||||
|
||||
parse_error:
|
||||
printk(KERN_WARNING "%s: Parse error: expect \"n n\" (n == 0 or 1) for AB and AS\n", __func__);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* The last attribute (the 'root' one actually) with all remaining data. */
|
||||
static PDCS_ATTR(info, 0600, pdcs_info_read, pdcs_info_write);
|
||||
|
||||
static struct subsys_attribute *pdcs_subsys_attrs[] = {
|
||||
&pdcs_attr_info,
|
||||
NULL, /* maybe more in the future? */
|
||||
};
|
||||
|
||||
static decl_subsys(paths, &ktype_pdcspath, NULL);
|
||||
static decl_subsys(pdc, NULL, NULL);
|
||||
|
||||
/**
|
||||
* pdcs_register_pathentries - Prepares path entries kobjects for sysfs usage.
|
||||
*
|
||||
* It creates kobjects corresponding to each path entry with nice sysfs
|
||||
* links to the real device. This is where the magic takes place: when
|
||||
* registering the subsystem attributes during module init, each kobject hereby
|
||||
* created will show in the sysfs tree as a folder containing files as defined
|
||||
* by path_subsys_attr[].
|
||||
*/
|
||||
static inline int __init
|
||||
pdcs_register_pathentries(void)
|
||||
{
|
||||
unsigned short i;
|
||||
struct pdcspath_entry *entry;
|
||||
|
||||
for (i = 0; (entry = pdcspath_entries[i]); i++) {
|
||||
if (pdcspath_fetch(entry) < 0)
|
||||
continue;
|
||||
|
||||
kobject_set_name(&entry->kobj, "%s", entry->name);
|
||||
kobj_set_kset_s(entry, paths_subsys);
|
||||
kobject_register(&entry->kobj);
|
||||
|
||||
if (!entry->dev)
|
||||
continue;
|
||||
|
||||
/* Add a nice symlink to the real device */
|
||||
sysfs_create_link(&entry->kobj, &entry->dev->kobj, "device");
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* pdcs_unregister_pathentries - Routine called when unregistering the module.
|
||||
*/
|
||||
static inline void __exit
|
||||
pdcs_unregister_pathentries(void)
|
||||
{
|
||||
unsigned short i;
|
||||
struct pdcspath_entry *entry;
|
||||
|
||||
for (i = 0; (entry = pdcspath_entries[i]); i++)
|
||||
if (entry->ready)
|
||||
kobject_unregister(&entry->kobj);
|
||||
}
|
||||
|
||||
/*
|
||||
* For now we register the pdc subsystem with the firmware subsystem
|
||||
* and the paths subsystem with the pdc subsystem
|
||||
*/
|
||||
static int __init
|
||||
pdc_stable_init(void)
|
||||
{
|
||||
struct subsys_attribute *attr;
|
||||
int i, rc = 0, error = 0;
|
||||
|
||||
/* find the size of the stable storage */
|
||||
if (pdc_stable_get_size(&pdcs_size) != PDC_OK)
|
||||
return -ENODEV;
|
||||
|
||||
printk(KERN_INFO "PDC Stable Storage facility v%s\n", PDCS_VERSION);
|
||||
|
||||
/* For now we'll register the pdc subsys within this driver */
|
||||
if ((rc = firmware_register(&pdc_subsys)))
|
||||
return rc;
|
||||
|
||||
/* Don't forget the info entry */
|
||||
for (i = 0; (attr = pdcs_subsys_attrs[i]) && !error; i++)
|
||||
if (attr->show)
|
||||
error = subsys_create_file(&pdc_subsys, attr);
|
||||
|
||||
/* register the paths subsys as a subsystem of pdc subsys */
|
||||
kset_set_kset_s(&paths_subsys, pdc_subsys);
|
||||
subsystem_register(&paths_subsys);
|
||||
|
||||
/* now we create all "files" for the paths subsys */
|
||||
pdcs_register_pathentries();
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void __exit
|
||||
pdc_stable_exit(void)
|
||||
{
|
||||
pdcs_unregister_pathentries();
|
||||
subsystem_unregister(&paths_subsys);
|
||||
|
||||
firmware_unregister(&pdc_subsys);
|
||||
}
|
||||
|
||||
|
||||
module_init(pdc_stable_init);
|
||||
module_exit(pdc_stable_exit);
|
||||
Reference in New Issue
Block a user