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drivers/char/ps3flash.c
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// SPDX-License-Identifier: GPL-2.0-only |
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/* * PS3 FLASH ROM Storage Driver * * Copyright (C) 2007 Sony Computer Entertainment Inc. * Copyright 2007 Sony Corp. |
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*/ #include <linux/fs.h> #include <linux/miscdevice.h> |
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#include <linux/slab.h> |
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#include <linux/uaccess.h> |
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#include <linux/module.h> |
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#include <asm/lv1call.h> #include <asm/ps3stor.h> #define DEVICE_NAME "ps3flash" #define FLASH_BLOCK_SIZE (256*1024) struct ps3flash_private { struct mutex mutex; /* Bounce buffer mutex */ |
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u64 chunk_sectors; int tag; /* Start sector of buffer, -1 if invalid */ bool dirty; |
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}; static struct ps3_storage_device *ps3flash_dev; |
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static int ps3flash_read_write_sectors(struct ps3_storage_device *dev, |
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u64 start_sector, int write) |
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{ |
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struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); u64 res = ps3stor_read_write_sectors(dev, dev->bounce_lpar, start_sector, priv->chunk_sectors, |
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write); if (res) { |
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dev_err(&dev->sbd.core, "%s:%u: %s failed 0x%llx ", __func__, |
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__LINE__, write ? "write" : "read", res); return -EIO; } |
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return 0; |
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} |
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static int ps3flash_writeback(struct ps3_storage_device *dev) |
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{ |
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struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); int res; |
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|
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if (!priv->dirty || priv->tag < 0) return 0; |
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res = ps3flash_read_write_sectors(dev, priv->tag, 1); |
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if (res) return res; |
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|
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priv->dirty = false; return 0; |
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} |
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static int ps3flash_fetch(struct ps3_storage_device *dev, u64 start_sector) |
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{ |
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struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); |
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int res; |
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if (start_sector == priv->tag) |
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return 0; res = ps3flash_writeback(dev); if (res) return res; priv->tag = -1; |
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res = ps3flash_read_write_sectors(dev, start_sector, 0); |
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if (res) return res; |
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priv->tag = start_sector; |
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return 0; |
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} static loff_t ps3flash_llseek(struct file *file, loff_t offset, int origin) { struct ps3_storage_device *dev = ps3flash_dev; |
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return generic_file_llseek_size(file, offset, origin, MAX_LFS_FILESIZE, dev->regions[dev->region_idx].size*dev->blk_size); |
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} |
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static ssize_t ps3flash_read(char __user *userbuf, void *kernelbuf, size_t count, loff_t *pos) |
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{ struct ps3_storage_device *dev = ps3flash_dev; |
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struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); |
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u64 size, sector, offset; |
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int res; |
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size_t remaining, n; |
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const void *src; |
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dev_dbg(&dev->sbd.core, |
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"%s:%u: Reading %zu bytes at position %lld to U0x%p/K0x%p ", __func__, __LINE__, count, *pos, userbuf, kernelbuf); |
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size = dev->regions[dev->region_idx].size*dev->blk_size; if (*pos >= size || !count) return 0; if (*pos + count > size) { dev_dbg(&dev->sbd.core, "%s:%u Truncating count from %zu to %llu ", __func__, __LINE__, count, size - *pos); count = size - *pos; } |
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sector = *pos / dev->bounce_size * priv->chunk_sectors; |
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offset = *pos % dev->bounce_size; |
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remaining = count; do { |
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n = min_t(u64, remaining, dev->bounce_size - offset); src = dev->bounce_buf + offset; |
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mutex_lock(&priv->mutex); |
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res = ps3flash_fetch(dev, sector); |
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if (res) |
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goto fail; |
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|
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dev_dbg(&dev->sbd.core, |
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"%s:%u: copy %lu bytes from 0x%p to U0x%p/K0x%p ", __func__, __LINE__, n, src, userbuf, kernelbuf); if (userbuf) { if (copy_to_user(userbuf, src, n)) { |
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res = -EFAULT; |
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goto fail; } userbuf += n; } if (kernelbuf) { memcpy(kernelbuf, src, n); kernelbuf += n; |
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} mutex_unlock(&priv->mutex); *pos += n; |
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remaining -= n; |
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sector += priv->chunk_sectors; |
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offset = 0; } while (remaining > 0); return count; fail: |
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mutex_unlock(&priv->mutex); return res; |
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} |
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static ssize_t ps3flash_write(const char __user *userbuf, const void *kernelbuf, size_t count, loff_t *pos) |
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{ struct ps3_storage_device *dev = ps3flash_dev; |
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struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); |
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u64 size, sector, offset; int res = 0; |
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size_t remaining, n; |
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void *dst; |
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dev_dbg(&dev->sbd.core, |
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"%s:%u: Writing %zu bytes at position %lld from U0x%p/K0x%p ", __func__, __LINE__, count, *pos, userbuf, kernelbuf); |
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size = dev->regions[dev->region_idx].size*dev->blk_size; if (*pos >= size || !count) return 0; if (*pos + count > size) { dev_dbg(&dev->sbd.core, "%s:%u Truncating count from %zu to %llu ", __func__, __LINE__, count, size - *pos); count = size - *pos; } |
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sector = *pos / dev->bounce_size * priv->chunk_sectors; |
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offset = *pos % dev->bounce_size; |
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remaining = count; do { |
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n = min_t(u64, remaining, dev->bounce_size - offset); |
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dst = dev->bounce_buf + offset; |
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|
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mutex_lock(&priv->mutex); |
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if (n != dev->bounce_size) |
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res = ps3flash_fetch(dev, sector); |
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else if (sector != priv->tag) res = ps3flash_writeback(dev); if (res) goto fail; |
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dev_dbg(&dev->sbd.core, |
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"%s:%u: copy %lu bytes from U0x%p/K0x%p to 0x%p ", __func__, __LINE__, n, userbuf, kernelbuf, dst); if (userbuf) { if (copy_from_user(dst, userbuf, n)) { res = -EFAULT; goto fail; } userbuf += n; } if (kernelbuf) { memcpy(dst, kernelbuf, n); kernelbuf += n; |
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} |
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priv->tag = sector; priv->dirty = true; |
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mutex_unlock(&priv->mutex); *pos += n; |
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remaining -= n; |
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sector += priv->chunk_sectors; |
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offset = 0; } while (remaining > 0); return count; fail: mutex_unlock(&priv->mutex); return res; } |
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static ssize_t ps3flash_user_read(struct file *file, char __user *buf, size_t count, loff_t *pos) { return ps3flash_read(buf, NULL, count, pos); } static ssize_t ps3flash_user_write(struct file *file, const char __user *buf, size_t count, loff_t *pos) { return ps3flash_write(buf, NULL, count, pos); } static ssize_t ps3flash_kernel_read(void *buf, size_t count, loff_t pos) { return ps3flash_read(NULL, buf, count, &pos); } static ssize_t ps3flash_kernel_write(const void *buf, size_t count, loff_t pos) { |
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ssize_t res; int wb; res = ps3flash_write(NULL, buf, count, &pos); if (res < 0) return res; /* Make kernel writes synchronous */ wb = ps3flash_writeback(ps3flash_dev); if (wb) return wb; return res; |
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} |
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static int ps3flash_flush(struct file *file, fl_owner_t id) { return ps3flash_writeback(ps3flash_dev); } |
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static int ps3flash_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
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{ |
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struct inode *inode = file_inode(file); |
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int err; |
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inode_lock(inode); |
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err = ps3flash_writeback(ps3flash_dev); |
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inode_unlock(inode); |
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return err; |
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} |
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static irqreturn_t ps3flash_interrupt(int irq, void *data) { struct ps3_storage_device *dev = data; int res; u64 tag, status; res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status); if (tag != dev->tag) dev_err(&dev->sbd.core, |
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"%s:%u: tag mismatch, got %llx, expected %llx ", |
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__func__, __LINE__, tag, dev->tag); if (res) { |
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dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%llx ", |
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__func__, __LINE__, res, status); } else { dev->lv1_status = status; complete(&dev->done); } return IRQ_HANDLED; } |
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static const struct file_operations ps3flash_fops = { .owner = THIS_MODULE, .llseek = ps3flash_llseek, |
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.read = ps3flash_user_read, .write = ps3flash_user_write, |
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.flush = ps3flash_flush, .fsync = ps3flash_fsync, |
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}; static const struct ps3_os_area_flash_ops ps3flash_kernel_ops = { .read = ps3flash_kernel_read, .write = ps3flash_kernel_write, |
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}; static struct miscdevice ps3flash_misc = { .minor = MISC_DYNAMIC_MINOR, .name = DEVICE_NAME, .fops = &ps3flash_fops, }; |
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static int ps3flash_probe(struct ps3_system_bus_device *_dev) |
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{ struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core); struct ps3flash_private *priv; int error; unsigned long tmp; tmp = dev->regions[dev->region_idx].start*dev->blk_size; if (tmp % FLASH_BLOCK_SIZE) { dev_err(&dev->sbd.core, "%s:%u region start %lu is not aligned ", __func__, __LINE__, tmp); return -EINVAL; } tmp = dev->regions[dev->region_idx].size*dev->blk_size; if (tmp % FLASH_BLOCK_SIZE) { dev_err(&dev->sbd.core, "%s:%u region size %lu is not aligned ", __func__, __LINE__, tmp); return -EINVAL; } /* use static buffer, kmalloc cannot allocate 256 KiB */ if (!ps3flash_bounce_buffer.address) return -ENODEV; if (ps3flash_dev) { dev_err(&dev->sbd.core, "Only one FLASH device is supported "); return -EBUSY; } ps3flash_dev = dev; priv = kzalloc(sizeof(*priv), GFP_KERNEL); if (!priv) { error = -ENOMEM; goto fail; } |
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ps3_system_bus_set_drvdata(&dev->sbd, priv); |
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mutex_init(&priv->mutex); |
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priv->tag = -1; |
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dev->bounce_size = ps3flash_bounce_buffer.size; dev->bounce_buf = ps3flash_bounce_buffer.address; |
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priv->chunk_sectors = dev->bounce_size / dev->blk_size; |
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error = ps3stor_setup(dev, ps3flash_interrupt); if (error) goto fail_free_priv; ps3flash_misc.parent = &dev->sbd.core; error = misc_register(&ps3flash_misc); if (error) { dev_err(&dev->sbd.core, "%s:%u: misc_register failed %d ", __func__, __LINE__, error); goto fail_teardown; } dev_info(&dev->sbd.core, "%s:%u: registered misc device %d ", __func__, __LINE__, ps3flash_misc.minor); |
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ps3_os_area_flash_register(&ps3flash_kernel_ops); |
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return 0; fail_teardown: ps3stor_teardown(dev); fail_free_priv: kfree(priv); |
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ps3_system_bus_set_drvdata(&dev->sbd, NULL); |
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fail: ps3flash_dev = NULL; return error; } static int ps3flash_remove(struct ps3_system_bus_device *_dev) { struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core); |
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ps3_os_area_flash_register(NULL); |
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misc_deregister(&ps3flash_misc); ps3stor_teardown(dev); |
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kfree(ps3_system_bus_get_drvdata(&dev->sbd)); ps3_system_bus_set_drvdata(&dev->sbd, NULL); |
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ps3flash_dev = NULL; return 0; } static struct ps3_system_bus_driver ps3flash = { .match_id = PS3_MATCH_ID_STOR_FLASH, .core.name = DEVICE_NAME, .core.owner = THIS_MODULE, .probe = ps3flash_probe, .remove = ps3flash_remove, .shutdown = ps3flash_remove, }; static int __init ps3flash_init(void) { return ps3_system_bus_driver_register(&ps3flash); } static void __exit ps3flash_exit(void) { ps3_system_bus_driver_unregister(&ps3flash); } module_init(ps3flash_init); module_exit(ps3flash_exit); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("PS3 FLASH ROM Storage Driver"); MODULE_AUTHOR("Sony Corporation"); MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_FLASH); |