/* * Core registration and callback routines for MTD * drivers and users. * * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> * Copyright © 2006 Red Hat UK Limited * * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * */ #include <linux/module.h>#include <linux/kernel.h>#include <linux/ptrace.h>#include <linux/seq_file.h>#include <linux/string.h>#include <linux/timer.h>#include <linux/major.h>#include <linux/fs.h>#include <linux/err.h>#include <linux/ioctl.h>#include <linux/init.h>#include <linux/proc_fs.h>#include <linux/idr.h>#include <linux/backing-dev.h>#include <linux/gfp.h> #include <linux/mtd/mtd.h>#include <linux/mtd/partitions.h> #include "mtdcore.h"/* * backing device capabilities for non-mappable devices (such as NAND flash) * - permits private mappings, copies are taken of the data */static struct backing_dev_info mtd_bdi_unmappable = { .capabilities = BDI_CAP_MAP_COPY,}; /* * backing device capabilities for R/O mappable devices (such as ROM) * - permits private mappings, copies are taken of the data * - permits non-writable shared mappings */static struct backing_dev_info mtd_bdi_ro_mappable = { .capabilities = (BDI_CAP_MAP_COPY | BDI_CAP_MAP_DIRECT | BDI_CAP_EXEC_MAP | BDI_CAP_READ_MAP),}; /* * backing device capabilities for writable mappable devices (such as RAM) * - permits private mappings, copies are taken of the data * - permits non-writable shared mappings */static struct backing_dev_info mtd_bdi_rw_mappable = { .capabilities = (BDI_CAP_MAP_COPY | BDI_CAP_MAP_DIRECT | BDI_CAP_EXEC_MAP | BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP),}; static int mtd_cls_suspend(struct device *dev, pm_message_t state);static int mtd_cls_resume(struct device *dev); static struct class mtd_class = { .name = "mtd", .owner = THIS_MODULE, .suspend = mtd_cls_suspend, .resume = mtd_cls_resume,}; static DEFINE_IDR(mtd_idr); /* These are exported solely for the purpose of mtd_blkdevs.c. You should not use them for _anything_ else */DEFINE_MUTEX(mtd_table_mutex);EXPORT_SYMBOL_GPL(mtd_table_mutex); struct mtd_info *__mtd_next_device(int i){ return idr_get_next(&mtd_idr, &i);}EXPORT_SYMBOL_GPL(__mtd_next_device); static LIST_HEAD(mtd_notifiers); #if defined(CONFIG_MTD_CHAR) || defined(CONFIG_MTD_CHAR_MODULE)#define MTD_DEVT(index) MKDEV(MTD_CHAR_MAJOR, (index)*2)#else#define MTD_DEVT(index) 0#endif /* REVISIT once MTD uses the driver model better, whoever allocates * the mtd_info will probably want to use the release() hook... */static void mtd_release(struct device *dev){ struct mtd_info __maybe_unused *mtd = dev_get_drvdata(dev); dev_t index = MTD_DEVT(mtd->index); /* remove /dev/mtdXro node if needed */ if (index) device_destroy(&mtd_class, index + 1);} static int mtd_cls_suspend(struct device *dev, pm_message_t state){ struct mtd_info *mtd = dev_get_drvdata(dev); return mtd ? mtd_suspend(mtd) : 0;} static int mtd_cls_resume(struct device *dev){ struct mtd_info *mtd = dev_get_drvdata(dev); if (mtd) mtd_resume(mtd); return 0;} static ssize_t mtd_type_show(struct device *dev, struct device_attribute *attr, char *buf){ struct mtd_info *mtd = dev_get_drvdata(dev); char *type; switch (mtd->type) { case MTD_ABSENT: type = "absent"; break; case MTD_RAM: type = "ram"; break; case MTD_ROM: type = "rom"; break; case MTD_NORFLASH: type = "nor"; break; case MTD_NANDFLASH: type = "nand"; break; case MTD_DATAFLASH: type = "dataflash"; break; case MTD_UBIVOLUME: type = "ubi"; break; default: type = "unknown"; } return snprintf(buf, PAGE_SIZE, "%s\n", type);}static DEVICE_ATTR(type, S_IRUGO, mtd_type_show, NULL); static ssize_t mtd_flags_show(struct device *dev, struct device_attribute *attr, char *buf){ struct mtd_info *mtd = dev_get_drvdata(dev); return snprintf(buf, PAGE_SIZE, "0x%lx\n", (unsigned long)mtd->flags); }static DEVICE_ATTR(flags, S_IRUGO, mtd_flags_show, NULL); static ssize_t mtd_size_show(struct device *dev, struct device_attribute *attr, char *buf){ struct mtd_info *mtd = dev_get_drvdata(dev); return snprintf(buf, PAGE_SIZE, "%llu\n", (unsigned long long)mtd->size); }static DEVICE_ATTR(size, S_IRUGO, mtd_size_show, NULL); static ssize_t mtd_erasesize_show(struct device *dev, struct device_attribute *attr, char *buf){ struct mtd_info *mtd = dev_get_drvdata(dev); return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->erasesize); }static DEVICE_ATTR(erasesize, S_IRUGO, mtd_erasesize_show, NULL); static ssize_t mtd_writesize_show(struct device *dev, struct device_attribute *attr, char *buf){ struct mtd_info *mtd = dev_get_drvdata(dev); return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->writesize); }static DEVICE_ATTR(writesize, S_IRUGO, mtd_writesize_show, NULL); static ssize_t mtd_subpagesize_show(struct device *dev, struct device_attribute *attr, char *buf){ struct mtd_info *mtd = dev_get_drvdata(dev); unsigned int subpagesize = mtd->writesize >> mtd->subpage_sft; return snprintf(buf, PAGE_SIZE, "%u\n", subpagesize); }static DEVICE_ATTR(subpagesize, S_IRUGO, mtd_subpagesize_show, NULL); static ssize_t mtd_oobsize_show(struct device *dev, struct device_attribute *attr, char *buf){ struct mtd_info *mtd = dev_get_drvdata(dev); return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->oobsize); }static DEVICE_ATTR(oobsize, S_IRUGO, mtd_oobsize_show, NULL); static ssize_t mtd_numeraseregions_show(struct device *dev, struct device_attribute *attr, char *buf){ struct mtd_info *mtd = dev_get_drvdata(dev); return snprintf(buf, PAGE_SIZE, "%u\n", mtd->numeraseregions); }static DEVICE_ATTR(numeraseregions, S_IRUGO, mtd_numeraseregions_show, NULL); static ssize_t mtd_name_show(struct device *dev, struct device_attribute *attr, char *buf){ struct mtd_info *mtd = dev_get_drvdata(dev); return snprintf(buf, PAGE_SIZE, "%s\n", mtd->name); }static DEVICE_ATTR(name, S_IRUGO, mtd_name_show, NULL); static ssize_t mtd_ecc_strength_show(struct device *dev, struct device_attribute *attr, char *buf){ struct mtd_info *mtd = dev_get_drvdata(dev); return snprintf(buf, PAGE_SIZE, "%u\n", mtd->ecc_strength);}static DEVICE_ATTR(ecc_strength, S_IRUGO, mtd_ecc_strength_show, NULL); static ssize_t mtd_bitflip_threshold_show(struct device *dev, struct device_attribute *attr, char *buf){ struct mtd_info *mtd = dev_get_drvdata(dev); return snprintf(buf, PAGE_SIZE, "%u\n", mtd->bitflip_threshold);} static ssize_t mtd_bitflip_threshold_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count){ struct mtd_info *mtd = dev_get_drvdata(dev); unsigned int bitflip_threshold; int retval; retval = kstrtouint(buf, 0, &bitflip_threshold); if (retval) return retval; mtd->bitflip_threshold = bitflip_threshold; return count;}static DEVICE_ATTR(bitflip_threshold, S_IRUGO | S_IWUSR, mtd_bitflip_threshold_show, mtd_bitflip_threshold_store); static struct attribute *mtd_attrs[] = { &dev_attr_type.attr, &dev_attr_flags.attr, &dev_attr_size.attr, &dev_attr_erasesize.attr, &dev_attr_writesize.attr, &dev_attr_subpagesize.attr, &dev_attr_oobsize.attr, &dev_attr_numeraseregions.attr, &dev_attr_name.attr, &dev_attr_ecc_strength.attr, &dev_attr_bitflip_threshold.attr, NULL,}; static struct attribute_group mtd_group = { .attrs = mtd_attrs,}; static const struct attribute_group *mtd_groups[] = { &mtd_group, NULL,}; static struct device_type mtd_devtype = { .name = "mtd", .groups = mtd_groups, .release = mtd_release,}; /** * add_mtd_device - register an MTD device * @mtd: pointer to new MTD device info structure * * Add a device to the list of MTD devices present in the system, and * notify each currently active MTD 'user' of its arrival. Returns * zero on success or 1 on failure, which currently will only happen * if there is insufficient memory or a sysfs error. */ int add_mtd_device(struct mtd_info *mtd){ struct mtd_notifier *not; int i, error; if (!mtd->backing_dev_info) { switch (mtd->type) { case MTD_RAM: mtd->backing_dev_info = &mtd_bdi_rw_mappable; break; case MTD_ROM: mtd->backing_dev_info = &mtd_bdi_ro_mappable; break; default: mtd->backing_dev_info = &mtd_bdi_unmappable; break; } } BUG_ON(mtd->writesize == 0); mutex_lock(&mtd_table_mutex); do { if (!idr_pre_get(&mtd_idr, GFP_KERNEL)) goto fail_locked; error = idr_get_new(&mtd_idr, mtd, &i); } while (error == -EAGAIN); if (error) goto fail_locked; mtd->index = i; mtd->usecount = 0; /* default value if not set by driver */ if (mtd->bitflip_threshold == 0) mtd->bitflip_threshold = mtd->ecc_strength; if (is_power_of_2(mtd->erasesize)) mtd->erasesize_shift = ffs(mtd->erasesize) - 1; else mtd->erasesize_shift = 0; if (is_power_of_2(mtd->writesize)) mtd->writesize_shift = ffs(mtd->writesize) - 1; else mtd->writesize_shift = 0; mtd->erasesize_mask = (1 << mtd->erasesize_shift) - 1; mtd->writesize_mask = (1 << mtd->writesize_shift) - 1; /* Some chips always power up locked. Unlock them now */ if ((mtd->flags & MTD_WRITEABLE) && (mtd->flags & MTD_POWERUP_LOCK)) { error = mtd_unlock(mtd, 0, mtd->size); if (error && error != -EOPNOTSUPP) printk(KERN_WARNING "%s: unlock failed, writes may not work\n", mtd->name); } /* Caller should have set dev.parent to match the * physical device. */ mtd->dev.type = &mtd_devtype; mtd->dev.class = &mtd_class; mtd->dev.devt = MTD_DEVT(i); dev_set_name(&mtd->dev, "mtd%d", i); dev_set_drvdata(&mtd->dev, mtd); if (device_register(&mtd->dev) != 0) goto fail_added; if (MTD_DEVT(i)) device_create(&mtd_class, mtd->dev.parent, MTD_DEVT(i) + 1, NULL, "mtd%dro", i); pr_debug("mtd: Giving out device %d to %s\n", i, mtd->name); /* No need to get a refcount on the module containing the notifier, since we hold the mtd_table_mutex */ list_for_each_entry(not, &mtd_notifiers, list) not->add(mtd); mutex_unlock(&mtd_table_mutex); /* We _know_ we aren't being removed, because our caller is still holding us here. So none of this try_ nonsense, and no bitching about it either. :) */ __module_get(THIS_MODULE); return 0; fail_added: idr_remove(&mtd_idr, i);fail_locked: mutex_unlock(&mtd_table_mutex); return 1;} /** * del_mtd_device - unregister an MTD device * @mtd: pointer to MTD device info structure * * Remove a device from the list of MTD devices present in the system, * and notify each currently active MTD 'user' of its departure. * Returns zero on success or 1 on failure, which currently will happen * if the requested device does not appear to be present in the list. */ int del_mtd_device(struct mtd_info *mtd){ int ret; struct mtd_notifier *not; mutex_lock(&mtd_table_mutex); if (idr_find(&mtd_idr, mtd->index) != mtd) { ret = -ENODEV; goto out_error; } /* No need to get a refcount on the module containing the notifier, since we hold the mtd_table_mutex */ list_for_each_entry(not, &mtd_notifiers, list) not->remove(mtd); if (mtd->usecount) { printk(KERN_NOTICE "Removing MTD device #%d (%s) with use count %d\n", mtd->index, mtd->name, mtd->usecount); ret = -EBUSY; } else { device_unregister(&mtd->dev); idr_remove(&mtd_idr, mtd->index); module_put(THIS_MODULE); ret = 0; } out_error: mutex_unlock(&mtd_table_mutex); return ret;} /** * mtd_device_parse_register - parse partitions and register an MTD device. * * @mtd: the MTD device to register * @types: the list of MTD partition probes to try, see * 'parse_mtd_partitions()' for more information * @parser_data: MTD partition parser-specific data * @parts: fallback partition information to register, if parsing fails; * only valid if %nr_parts > %0 * @nr_parts: the number of partitions in parts, if zero then the full * MTD device is registered if no partition info is found * * This function aggregates MTD partitions parsing (done by * 'parse_mtd_partitions()') and MTD device and partitions registering. It * basically follows the most common pattern found in many MTD drivers: * * * It first tries to probe partitions on MTD device @mtd using parsers * specified in @types (if @types is %NULL, then the default list of parsers * is used, see 'parse_mtd_partitions()' for more information). If none are * found this functions tries to fallback to information specified in * @parts/@nr_parts. * * If any partitioning info was found, this function registers the found * partitions. * * If no partitions were found this function just registers the MTD device * @mtd and exits. * * Returns zero in case of success and a negative error code in case of failure. */int mtd_device_parse_register(struct mtd_info *mtd, const char **types,Lines 1–500 of 1203. Load more
/* * Core registration and callback routines for MTD * drivers and users. * * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> * Copyright © 2006 Red Hat UK Limited * * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/ptrace.h> #include <linux/seq_file.h> #include <linux/string.h> #include <linux/timer.h> #include <linux/major.h> #include <linux/fs.h> #include <linux/err.h> #include <linux/ioctl.h> #include <linux/init.h> #include <linux/proc_fs.h> #include <linux/idr.h> #include <linux/backing-dev.h> #include <linux/gfp.h> #include <linux/mtd/mtd.h> #include <linux/mtd/partitions.h> #include "mtdcore.h" /* * backing device capabilities for non-mappable devices (such as NAND flash) * - permits private mappings, copies are taken of the data */ static struct backing_dev_info mtd_bdi_unmappable = { .capabilities = BDI_CAP_MAP_COPY, }; /* * backing device capabilities for R/O mappable devices (such as ROM) * - permits private mappings, copies are taken of the data * - permits non-writable shared mappings */ static struct backing_dev_info mtd_bdi_ro_mappable = { .capabilities = (BDI_CAP_MAP_COPY | BDI_CAP_MAP_DIRECT | BDI_CAP_EXEC_MAP | BDI_CAP_READ_MAP), }; /* * backing device capabilities for writable mappable devices (such as RAM) * - permits private mappings, copies are taken of the data * - permits non-writable shared mappings */ static struct backing_dev_info mtd_bdi_rw_mappable = { .capabilities = (BDI_CAP_MAP_COPY | BDI_CAP_MAP_DIRECT | BDI_CAP_EXEC_MAP | BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP), }; static int mtd_cls_suspend(struct device *dev, pm_message_t state); static int mtd_cls_resume(struct device *dev); static struct class mtd_class = { .name = "mtd", .owner = THIS_MODULE, .suspend = mtd_cls_suspend, .resume = mtd_cls_resume, }; static DEFINE_IDR(mtd_idr); /* These are exported solely for the purpose of mtd_blkdevs.c. You should not use them for _anything_ else */ DEFINE_MUTEX(mtd_table_mutex); EXPORT_SYMBOL_GPL(mtd_table_mutex); struct mtd_info *__mtd_next_device(int i) { return idr_get_next(&mtd_idr, &i); } EXPORT_SYMBOL_GPL(__mtd_next_device); static LIST_HEAD(mtd_notifiers); #if defined(CONFIG_MTD_CHAR) || defined(CONFIG_MTD_CHAR_MODULE) #define MTD_DEVT(index) MKDEV(MTD_CHAR_MAJOR, (index)*2) #else #define MTD_DEVT(index) 0 #endif /* REVISIT once MTD uses the driver model better, whoever allocates * the mtd_info will probably want to use the release() hook... */ static void mtd_release(struct device *dev) { struct mtd_info __maybe_unused *mtd = dev_get_drvdata(dev); dev_t index = MTD_DEVT(mtd->index); /* remove /dev/mtdXro node if needed */ if (index) device_destroy(&mtd_class, index + 1); } static int mtd_cls_suspend(struct device *dev, pm_message_t state) { struct mtd_info *mtd = dev_get_drvdata(dev); return mtd ? mtd_suspend(mtd) : 0; } static int mtd_cls_resume(struct device *dev) { struct mtd_info *mtd = dev_get_drvdata(dev); if (mtd) mtd_resume(mtd); return 0; } static ssize_t mtd_type_show(struct device *dev, struct device_attribute *attr, char *buf) { struct mtd_info *mtd = dev_get_drvdata(dev); char *type; switch (mtd->type) { case MTD_ABSENT: type = "absent"; break; case MTD_RAM: type = "ram"; break; case MTD_ROM: type = "rom"; break; case MTD_NORFLASH: type = "nor"; break; case MTD_NANDFLASH: type = "nand"; break; case MTD_DATAFLASH: type = "dataflash"; break; case MTD_UBIVOLUME: type = "ubi"; break; default: type = "unknown"; } return snprintf(buf, PAGE_SIZE, "%s\n", type); } static DEVICE_ATTR(type, S_IRUGO, mtd_type_show, NULL); static ssize_t mtd_flags_show(struct device *dev, struct device_attribute *attr, char *buf) { struct mtd_info *mtd = dev_get_drvdata(dev); return snprintf(buf, PAGE_SIZE, "0x%lx\n", (unsigned long)mtd->flags); } static DEVICE_ATTR(flags, S_IRUGO, mtd_flags_show, NULL); static ssize_t mtd_size_show(struct device *dev, struct device_attribute *attr, char *buf) { struct mtd_info *mtd = dev_get_drvdata(dev); return snprintf(buf, PAGE_SIZE, "%llu\n", (unsigned long long)mtd->size); } static DEVICE_ATTR(size, S_IRUGO, mtd_size_show, NULL); static ssize_t mtd_erasesize_show(struct device *dev, struct device_attribute *attr, char *buf) { struct mtd_info *mtd = dev_get_drvdata(dev); return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->erasesize); } static DEVICE_ATTR(erasesize, S_IRUGO, mtd_erasesize_show, NULL); static ssize_t mtd_writesize_show(struct device *dev, struct device_attribute *attr, char *buf) { struct mtd_info *mtd = dev_get_drvdata(dev); return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->writesize); } static DEVICE_ATTR(writesize, S_IRUGO, mtd_writesize_show, NULL); static ssize_t mtd_subpagesize_show(struct device *dev, struct device_attribute *attr, char *buf) { struct mtd_info *mtd = dev_get_drvdata(dev); unsigned int subpagesize = mtd->writesize >> mtd->subpage_sft; return snprintf(buf, PAGE_SIZE, "%u\n", subpagesize); } static DEVICE_ATTR(subpagesize, S_IRUGO, mtd_subpagesize_show, NULL); static ssize_t mtd_oobsize_show(struct device *dev, struct device_attribute *attr, char *buf) { struct mtd_info *mtd = dev_get_drvdata(dev); return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->oobsize); } static DEVICE_ATTR(oobsize, S_IRUGO, mtd_oobsize_show, NULL); static ssize_t mtd_numeraseregions_show(struct device *dev, struct device_attribute *attr, char *buf) { struct mtd_info *mtd = dev_get_drvdata(dev); return snprintf(buf, PAGE_SIZE, "%u\n", mtd->numeraseregions); } static DEVICE_ATTR(numeraseregions, S_IRUGO, mtd_numeraseregions_show, NULL); static ssize_t mtd_name_show(struct device *dev, struct device_attribute *attr, char *buf) { struct mtd_info *mtd = dev_get_drvdata(dev); return snprintf(buf, PAGE_SIZE, "%s\n", mtd->name); } static DEVICE_ATTR(name, S_IRUGO, mtd_name_show, NULL); static ssize_t mtd_ecc_strength_show(struct device *dev, struct device_attribute *attr, char *buf) { struct mtd_info *mtd = dev_get_drvdata(dev); return snprintf(buf, PAGE_SIZE, "%u\n", mtd->ecc_strength); } static DEVICE_ATTR(ecc_strength, S_IRUGO, mtd_ecc_strength_show, NULL); static ssize_t mtd_bitflip_threshold_show(struct device *dev, struct device_attribute *attr, char *buf) { struct mtd_info *mtd = dev_get_drvdata(dev); return snprintf(buf, PAGE_SIZE, "%u\n", mtd->bitflip_threshold); } static ssize_t mtd_bitflip_threshold_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct mtd_info *mtd = dev_get_drvdata(dev); unsigned int bitflip_threshold; int retval; retval = kstrtouint(buf, 0, &bitflip_threshold); if (retval) return retval; mtd->bitflip_threshold = bitflip_threshold; return count; } static DEVICE_ATTR(bitflip_threshold, S_IRUGO | S_IWUSR, mtd_bitflip_threshold_show, mtd_bitflip_threshold_store); static struct attribute *mtd_attrs[] = { &dev_attr_type.attr, &dev_attr_flags.attr, &dev_attr_size.attr, &dev_attr_erasesize.attr, &dev_attr_writesize.attr, &dev_attr_subpagesize.attr, &dev_attr_oobsize.attr, &dev_attr_numeraseregions.attr, &dev_attr_name.attr, &dev_attr_ecc_strength.attr, &dev_attr_bitflip_threshold.attr, NULL, }; static struct attribute_group mtd_group = { .attrs = mtd_attrs, }; static const struct attribute_group *mtd_groups[] = { &mtd_group, NULL, }; static struct device_type mtd_devtype = { .name = "mtd", .groups = mtd_groups, .release = mtd_release, }; /** * add_mtd_device - register an MTD device * @mtd: pointer to new MTD device info structure * * Add a device to the list of MTD devices present in the system, and * notify each currently active MTD 'user' of its arrival. Returns * zero on success or 1 on failure, which currently will only happen * if there is insufficient memory or a sysfs error. */ int add_mtd_device(struct mtd_info *mtd) { struct mtd_notifier *not; int i, error; if (!mtd->backing_dev_info) { switch (mtd->type) { case MTD_RAM: mtd->backing_dev_info = &mtd_bdi_rw_mappable; break; case MTD_ROM: mtd->backing_dev_info = &mtd_bdi_ro_mappable; break; default: mtd->backing_dev_info = &mtd_bdi_unmappable; break; } } BUG_ON(mtd->writesize == 0); mutex_lock(&mtd_table_mutex); do { if (!idr_pre_get(&mtd_idr, GFP_KERNEL)) goto fail_locked; error = idr_get_new(&mtd_idr, mtd, &i); } while (error == -EAGAIN); if (error) goto fail_locked; mtd->index = i; mtd->usecount = 0; /* default value if not set by driver */ if (mtd->bitflip_threshold == 0) mtd->bitflip_threshold = mtd->ecc_strength; if (is_power_of_2(mtd->erasesize)) mtd->erasesize_shift = ffs(mtd->erasesize) - 1; else mtd->erasesize_shift = 0; if (is_power_of_2(mtd->writesize)) mtd->writesize_shift = ffs(mtd->writesize) - 1; else mtd->writesize_shift = 0; mtd->erasesize_mask = (1 << mtd->erasesize_shift) - 1; mtd->writesize_mask = (1 << mtd->writesize_shift) - 1; /* Some chips always power up locked. Unlock them now */ if ((mtd->flags & MTD_WRITEABLE) && (mtd->flags & MTD_POWERUP_LOCK)) { error = mtd_unlock(mtd, 0, mtd->size); if (error && error != -EOPNOTSUPP) printk(KERN_WARNING "%s: unlock failed, writes may not work\n", mtd->name); } /* Caller should have set dev.parent to match the * physical device. */ mtd->dev.type = &mtd_devtype; mtd->dev.class = &mtd_class; mtd->dev.devt = MTD_DEVT(i); dev_set_name(&mtd->dev, "mtd%d", i); dev_set_drvdata(&mtd->dev, mtd); if (device_register(&mtd->dev) != 0) goto fail_added; if (MTD_DEVT(i)) device_create(&mtd_class, mtd->dev.parent, MTD_DEVT(i) + 1, NULL, "mtd%dro", i); pr_debug("mtd: Giving out device %d to %s\n", i, mtd->name); /* No need to get a refcount on the module containing the notifier, since we hold the mtd_table_mutex */ list_for_each_entry(not, &mtd_notifiers, list) not->add(mtd); mutex_unlock(&mtd_table_mutex); /* We _know_ we aren't being removed, because our caller is still holding us here. So none of this try_ nonsense, and no bitching about it either. :) */ __module_get(THIS_MODULE); return 0; fail_added: idr_remove(&mtd_idr, i); fail_locked: mutex_unlock(&mtd_table_mutex); return 1; } /** * del_mtd_device - unregister an MTD device * @mtd: pointer to MTD device info structure * * Remove a device from the list of MTD devices present in the system, * and notify each currently active MTD 'user' of its departure. * Returns zero on success or 1 on failure, which currently will happen * if the requested device does not appear to be present in the list. */ int del_mtd_device(struct mtd_info *mtd) { int ret; struct mtd_notifier *not; mutex_lock(&mtd_table_mutex); if (idr_find(&mtd_idr, mtd->index) != mtd) { ret = -ENODEV; goto out_error; } /* No need to get a refcount on the module containing the notifier, since we hold the mtd_table_mutex */ list_for_each_entry(not, &mtd_notifiers, list) not->remove(mtd); if (mtd->usecount) { printk(KERN_NOTICE "Removing MTD device #%d (%s) with use count %d\n", mtd->index, mtd->name, mtd->usecount); ret = -EBUSY; } else { device_unregister(&mtd->dev); idr_remove(&mtd_idr, mtd->index); module_put(THIS_MODULE); ret = 0; } out_error: mutex_unlock(&mtd_table_mutex); return ret; } /** * mtd_device_parse_register - parse partitions and register an MTD device. * * @mtd: the MTD device to register * @types: the list of MTD partition probes to try, see * 'parse_mtd_partitions()' for more information * @parser_data: MTD partition parser-specific data * @parts: fallback partition information to register, if parsing fails; * only valid if %nr_parts > %0 * @nr_parts: the number of partitions in parts, if zero then the full * MTD device is registered if no partition info is found * * This function aggregates MTD partitions parsing (done by * 'parse_mtd_partitions()') and MTD device and partitions registering. It * basically follows the most common pattern found in many MTD drivers: * * * It first tries to probe partitions on MTD device @mtd using parsers * specified in @types (if @types is %NULL, then the default list of parsers * is used, see 'parse_mtd_partitions()' for more information). If none are * found this functions tries to fallback to information specified in * @parts/@nr_parts. * * If any partitioning info was found, this function registers the found * partitions. * * If no partitions were found this function just registers the MTD device * @mtd and exits. * * Returns zero in case of success and a negative error code in case of failure. */ int mtd_device_parse_register(struct mtd_info *mtd, const char **types,