diff options
Diffstat (limited to 'drivers/parisc/pdc_stable.c')
| -rw-r--r-- | drivers/parisc/pdc_stable.c | 735 |
1 files changed, 735 insertions, 0 deletions
diff --git a/drivers/parisc/pdc_stable.c b/drivers/parisc/pdc_stable.c new file mode 100644 index 00000000000..67c8f3b4484 --- /dev/null +++ b/drivers/parisc/pdc_stable.c @@ -0,0 +1,735 @@ +/* + * Interfaces to retrieve and set PDC Stable options (firmware) + * + * Copyright (C) 2005 Thibaut VARENE <varenet@parisc-linux.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * + * DEV NOTE: the PDC Procedures reference states that: + * "A minimum of 96 bytes of Stable Storage is required. Providing more than + * 96 bytes of Stable Storage is optional [...]. Failure to provide the + * optional locations from 96 to 192 results in the loss of certain + * functionality during boot." + * + * Since locations between 96 and 192 are the various paths, most (if not + * all) PA-RISC machines should have them. Anyway, for safety reasons, the + * following code can deal with only 96 bytes of Stable Storage, and all + * sizes between 96 and 192 bytes (provided they are multiple of struct + * device_path size, eg: 128, 160 and 192) to provide full information. + * The code makes no use of data above 192 bytes. One last word: there's one + * path we can always count on: the primary path. + */ + +#undef PDCS_DEBUG +#ifdef PDCS_DEBUG +#define DPRINTK(fmt, args...) printk(KERN_DEBUG fmt, ## args) +#else +#define DPRINTK(fmt, args...) +#endif + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/sched.h> /* for capable() */ +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/ctype.h> +#include <linux/sysfs.h> +#include <linux/kobject.h> +#include <linux/device.h> +#include <linux/errno.h> + +#include <asm/pdc.h> +#include <asm/page.h> +#include <asm/uaccess.h> +#include <asm/hardware.h> + +#define PDCS_VERSION "0.09" + +#define PDCS_ADDR_PPRI 0x00 +#define PDCS_ADDR_OSID 0x40 +#define PDCS_ADDR_FSIZ 0x5C +#define PDCS_ADDR_PCON 0x60 +#define PDCS_ADDR_PALT 0x80 +#define PDCS_ADDR_PKBD 0xA0 + +MODULE_AUTHOR("Thibaut VARENE <varenet@parisc-linux.org>"); +MODULE_DESCRIPTION("sysfs interface to HP PDC Stable Storage data"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(PDCS_VERSION); + +static unsigned long pdcs_size = 0; + +/* This struct defines what we need to deal with a parisc pdc path entry */ +struct pdcspath_entry { + short ready; /* entry record is valid if != 0 */ + unsigned long addr; /* entry address in stable storage */ + char *name; /* entry name */ + struct device_path devpath; /* device path in parisc representation */ + struct device *dev; /* corresponding device */ + struct kobject kobj; +}; + +struct pdcspath_attribute { + struct attribute attr; + ssize_t (*show)(struct pdcspath_entry *entry, char *buf); + ssize_t (*store)(struct pdcspath_entry *entry, const char *buf, size_t count); +}; + +#define PDCSPATH_ENTRY(_addr, _name) \ +struct pdcspath_entry pdcspath_entry_##_name = { \ + .ready = 0, \ + .addr = _addr, \ + .name = __stringify(_name), \ +}; + +#define PDCS_ATTR(_name, _mode, _show, _store) \ +struct subsys_attribute pdcs_attr_##_name = { \ + .attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE}, \ + .show = _show, \ + .store = _store, \ +}; + +#define PATHS_ATTR(_name, _mode, _show, _store) \ +struct pdcspath_attribute paths_attr_##_name = { \ + .attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE}, \ + .show = _show, \ + .store = _store, \ +}; + +#define to_pdcspath_attribute(_attr) container_of(_attr, struct pdcspath_attribute, attr) +#define to_pdcspath_entry(obj) container_of(obj, struct pdcspath_entry, kobj) + +/** + * pdcspath_fetch - This function populates the path entry structs. + * @entry: A pointer to an allocated pdcspath_entry. + * + * The general idea is that you don't read from the Stable Storage every time + * you access the files provided by the facilites. We store a copy of the + * content of the stable storage WRT various paths in these structs. We read + * these structs when reading the files, and we will write to these structs when + * writing to the files, and only then write them back to the Stable Storage. + */ +static int +pdcspath_fetch(struct pdcspath_entry *entry) +{ + struct device_path *devpath; + + if (!entry) + return -EINVAL; + + devpath = &entry->devpath; + + DPRINTK("%s: fetch: 0x%p, 0x%p, addr: 0x%lx\n", __func__, + entry, devpath, entry->addr); + + /* addr, devpath and count must be word aligned */ + if (pdc_stable_read(entry->addr, devpath, sizeof(*devpath)) != PDC_OK) + return -EIO; + + /* Find the matching device. + NOTE: hardware_path overlays with device_path, so the nice cast can + be used */ + entry->dev = hwpath_to_device((struct hardware_path *)devpath); + + entry->ready = 1; + + DPRINTK("%s: device: 0x%p\n", __func__, entry->dev); + + return 0; +} + +/** + * pdcspath_store - This function writes a path to stable storage. + * @entry: A pointer to an allocated pdcspath_entry. + * + * It can be used in two ways: either by passing it a preset devpath struct + * containing an already computed hardware path, or by passing it a device + * pointer, from which it'll find out the corresponding hardware path. + * For now we do not handle the case where there's an error in writing to the + * Stable Storage area, so you'd better not mess up the data :P + */ +static int +pdcspath_store(struct pdcspath_entry *entry) +{ + struct device_path *devpath; + + if (!entry) + return -EINVAL; + + devpath = &entry->devpath; + + /* We expect the caller to set the ready flag to 0 if the hardware + path struct provided is invalid, so that we know we have to fill it. + First case, we don't have a preset hwpath... */ + if (!entry->ready) { + /* ...but we have a device, map it */ + if (entry->dev) + device_to_hwpath(entry->dev, (struct hardware_path *)devpath); + else + return -EINVAL; + } + /* else, we expect the provided hwpath to be valid. */ + + DPRINTK("%s: store: 0x%p, 0x%p, addr: 0x%lx\n", __func__, + entry, devpath, entry->addr); + + /* addr, devpath and count must be word aligned */ + if (pdc_stable_write(entry->addr, devpath, sizeof(*devpath)) != PDC_OK) { + printk(KERN_ERR "%s: an error occured when writing to PDC.\n" + "It is likely that the Stable Storage data has been corrupted.\n" + "Please check it carefully upon next reboot.\n", __func__); + return -EIO; + } + + entry->ready = 1; + + DPRINTK("%s: device: 0x%p\n", __func__, entry->dev); + + return 0; +} + +/** + * pdcspath_hwpath_read - This function handles hardware path pretty printing. + * @entry: An allocated and populated pdscpath_entry struct. + * @buf: The output buffer to write to. + * + * We will call this function to format the output of the hwpath attribute file. + */ +static ssize_t +pdcspath_hwpath_read(struct pdcspath_entry *entry, char *buf) +{ + char *out = buf; + struct device_path *devpath; + unsigned short i; + + if (!entry || !buf) + return -EINVAL; + + devpath = &entry->devpath; + + if (!entry->ready) + return -ENODATA; + + for (i = 0; i < 6; i++) { + if (devpath->bc[i] >= 128) + continue; + out += sprintf(out, "%u/", (unsigned char)devpath->bc[i]); + } + out += sprintf(out, "%u\n", (unsigned char)devpath->mod); + + return out - buf; +} + +/** + * pdcspath_hwpath_write - This function handles hardware path modifying. + * @entry: An allocated and populated pdscpath_entry struct. + * @buf: The input buffer to read from. + * @count: The number of bytes to be read. + * + * We will call this function to change the current hardware path. + * Hardware paths are to be given '/'-delimited, without brackets. + * We take care to make sure that the provided path actually maps to an existing + * device, BUT nothing would prevent some foolish user to set the path to some + * PCI bridge or even a CPU... + * A better work around would be to make sure we are at the end of a device tree + * for instance, but it would be IMHO beyond the simple scope of that driver. + * The aim is to provide a facility. Data correctness is left to userland. + */ +static ssize_t +pdcspath_hwpath_write(struct pdcspath_entry *entry, const char *buf, size_t count) +{ + struct hardware_path hwpath; + unsigned short i; + char in[count+1], *temp; + struct device *dev; + + 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. 0xff is a blank pattern */ + memset(&hwpath, 0xff, sizeof(hwpath)); + + /* First, pick the mod field (the last one of the input string) */ + if (!(temp = strrchr(in, '/'))) + return -EINVAL; + + hwpath.mod = simple_strtoul(temp+1, NULL, 10); + in[temp-in] = '\0'; /* truncate the remaining string. just precaution */ + DPRINTK("%s: mod: %d\n", __func__, hwpath.mod); + + /* Then, loop for each delimiter, making sure we don't have too many. + we write the bc fields in a down-top way. No matter what, we stop + before writing the last field. If there are too many fields anyway, + then the user is a moron and it'll be caught up later when we'll + check the consistency of the given hwpath. */ + for (i=5; ((temp = strrchr(in, '/'))) && (temp-in > 0) && (likely(i)); i--) { + hwpath.bc[i] = simple_strtoul(temp+1, NULL, 10); + in[temp-in] = '\0'; + DPRINTK("%s: bc[%d]: %d\n", __func__, i, hwpath.bc[i]); + } + + /* Store the final field */ + hwpath.bc[i] = simple_strtoul(in, NULL, 10); + DPRINTK("%s: bc[%d]: %d\n", __func__, i, hwpath.bc[i]); + + /* Now we check that the user isn't trying to lure us */ + if (!(dev = hwpath_to_device((struct hardware_path *)&hwpath))) { + printk(KERN_WARNING "%s: attempt to set invalid \"%s\" " + "hardware path: %s\n", __func__, entry->name, buf); + return -EINVAL; + } + + /* So far so good, let's get in deep */ + entry->ready = 0; + entry->dev = dev; + + /* Now, dive in. Write back to the hardware */ + WARN_ON(pdcspath_store(entry)); /* this warn should *NEVER* happen */ + + /* Update the symlink to the real device */ + sysfs_remove_link(&entry->kobj, "device"); + sysfs_create_link(&entry->kobj, &entry->dev->kobj, "device"); + + printk(KERN_INFO "PDC Stable Storage: changed \"%s\" path to \"%s\"\n", + entry->name, buf); + + return count; +} + +/** + * pdcspath_layer_read - Extended layer (eg. SCSI ids) pretty printing. + * @entry: An allocated and populated pdscpath_entry struct. + * @buf: The output buffer to write to. + * + * We will call this function to format the output of the layer attribute file. + */ +static ssize_t +pdcspath_layer_read(struct pdcspath_entry *entry, char *buf) +{ + char *out = buf; + struct device_path *devpath; + unsigned short i; + + if (!entry || !buf) + return -EINVAL; + + devpath = &entry->devpath; + + if (!entry->ready) + return -ENODATA; + + for (i = 0; devpath->layers[i] && (likely(i < 6)); i++) + out += sprintf(out, "%u ", devpath->layers[i]); + + out += sprintf(out, "\n"); + + return out - buf; +} + +/** + * pdcspath_layer_write - This function handles extended layer modifying. + * @entry: An allocated and populated pdscpath_entry struct. + * @buf: The input buffer to read from. + * @count: The number of bytes to be read. + * + * We will call this function to change the current layer value. + * Layers are to be given '.'-delimited, without brackets. + * XXX beware we are far less checky WRT input data provided than for hwpath. + * Potential harm can be done, since there's no way to check the validity of + * the layer fields. + */ +static ssize_t +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); |