| 1 | |
| 2 | |
| 3 | * Copyright (c) by Jaroslav Kysela <[email protected]>
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| 4 | *
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| 5 | * Misc memory accessors
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| 6 |
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| 7 |
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| 8 | #include <linux/export.h>
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| 9 | #include <linux/io.h>
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| 10 | #include <linux/uaccess.h>
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| 11 | #include <sound/core.h>
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| 12 | #include <sound/pcm.h>
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| 13 |
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| 14 | |
| 15 | * copy_to_user_fromio - copy data from mmio-space to user-space
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| 16 | * @dst: the destination pointer on user-space
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| 17 | * @src: the source pointer on mmio
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| 18 | * @count: the data size to copy in bytes
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| 19 | *
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| 20 | * Copies the data from mmio-space to user-space.
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| 21 | *
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| 22 | * Return: Zero if successful, or non-zero on failure.
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| 23 |
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| 24 | int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count)
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| 25 | {
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| 26 | struct iov_iter iter;
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| 27 |
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| 28 | if (import_ubuf(ITER_DEST, dst, count, &iter))
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| 29 | return -EFAULT;
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| 30 | if (copy_to_iter_fromio((const void __iomem *)src, count, &iter) != count)
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| 31 | return -EFAULT;
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| 32 | return 0;
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| 33 | }
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| 34 | EXPORT_SYMBOL(copy_to_user_fromio);
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| 35 |
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| 36 | |
| 37 | * copy_to_iter_fromio - copy data from mmio-space to iov_iter
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| 38 | * @src: the source pointer on mmio
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| 39 | * @count: the data size to copy in bytes
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| 40 | * @dst: the destination iov_iter
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| 41 | *
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| 42 | * Copies the data from mmio-space to iov_iter.
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| 43 | *
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| 44 | * Return: number of bytes to be copied
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| 45 |
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| 46 | size_t copy_to_iter_fromio(const void __iomem *src, size_t count,
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| 47 | struct iov_iter *dst)
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| 48 | {
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| 49 | #if defined(__i386__) || defined(CONFIG_SPARC32)
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| 50 | return copy_to_iter((const void __force *)src, count, dst);
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| 51 | #else
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| 52 | char buf[256];
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| 53 | size_t res = 0;
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| 54 |
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| 55 | while (count) {
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| 56 | size_t c = count;
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| 57 | if (c > sizeof(buf))
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| 58 | c = sizeof(buf);
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| 59 | memcpy_fromio(buf, (void __iomem *)src, c);
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| 60 | if (copy_to_iter(buf, c, dst) != c)
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| 61 | return res;
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| 62 | count -= c;
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| 63 | src += c;
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| 64 | res += c;
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| 65 | }
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| 66 | return res;
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| 67 | #endif
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| 68 | }
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| 69 | EXPORT_SYMBOL(copy_to_iter_fromio);
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| 70 |
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| 71 | |
| 72 | * copy_from_user_toio - copy data from user-space to mmio-space
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| 73 | * @dst: the destination pointer on mmio-space
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| 74 | * @src: the source pointer on user-space
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| 75 | * @count: the data size to copy in bytes
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| 76 | *
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| 77 | * Copies the data from user-space to mmio-space.
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| 78 | *
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| 79 | * Return: Zero if successful, or non-zero on failure.
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| 80 |
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| 81 | int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count)
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| 82 | {
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| 83 | struct iov_iter iter;
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| 84 |
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| 85 | if (import_ubuf(ITER_SOURCE, (void __user *)src, count, &iter))
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| 86 | return -EFAULT;
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| 87 | if (copy_from_iter_toio((void __iomem *)dst, count, &iter) != count)
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| 88 | return -EFAULT;
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| 89 | return 0;
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| 90 | }
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| 91 | EXPORT_SYMBOL(copy_from_user_toio);
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| 92 |
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| 93 | |
| 94 | * copy_from_iter_toio - copy data from iov_iter to mmio-space
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| 95 | * @dst: the destination pointer on mmio-space
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| 96 | * @count: the data size to copy in bytes
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| 97 | * @src: the source iov_iter
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| 98 | *
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| 99 | * Copies the data from iov_iter to mmio-space.
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| 100 | *
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| 101 | * Return: number of bytes to be copied
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| 102 |
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| 103 | size_t copy_from_iter_toio(void __iomem *dst, size_t count,
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| 104 | struct iov_iter *src)
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| 105 | {
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| 106 | #if defined(__i386__) || defined(CONFIG_SPARC32)
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| 107 | return copy_from_iter((void __force *)dst, count, src);
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| 108 | #else
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| 109 | char buf[256];
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| 110 | size_t res = 0;
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| 111 |
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| 112 | while (count) {
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| 113 | size_t c = count;
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| 114 | if (c > sizeof(buf))
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| 115 | c = sizeof(buf);
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| 116 | if (copy_from_iter(buf, c, src) != c)
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| 117 | return res;
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| 118 | memcpy_toio(dst, buf, c);
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| 119 | count -= c;
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| 120 | dst += c;
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| 121 | res += c;
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| 122 | }
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| 123 | return res;
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| 124 | #endif
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| 125 | }
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| 126 | EXPORT_SYMBOL(copy_from_iter_toio);
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