LinuxKPI: firmware: add request_partial_firmware_into_buf()
A (so far out-of-tree) driver update needs request_partial_firmware_into_buf(). Given we load the full .ko file using firmware(9) just do that and copy the requeste data into the buffer (rather than poissibly only reading portions of the firmware file). MFC after: 1 week
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@ -2,6 +2,7 @@
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2020-2021 The FreeBSD Foundation
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* Copyright (c) 2022 Bjoern A. Zeeb
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*
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* This software was developed by Björn Zeeb under sponsorship from
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* the FreeBSD Foundation.
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@ -56,6 +57,8 @@ int linuxkpi_request_firmware(const struct linuxkpi_firmware **,
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int linuxkpi_firmware_request_nowarn(const struct linuxkpi_firmware **,
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const char *, struct device *);
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void linuxkpi_release_firmware(const struct linuxkpi_firmware *);
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int linuxkpi_request_partial_firmware_into_buf(const struct linuxkpi_firmware **,
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const char *, struct device *, uint8_t *, size_t, size_t);
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static __inline int
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@ -100,6 +103,16 @@ release_firmware(const struct linuxkpi_firmware *fw)
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linuxkpi_release_firmware(fw);
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}
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static inline int
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request_partial_firmware_into_buf(const struct linuxkpi_firmware **fw,
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const char *fw_name, struct device *dev, void *buf, size_t buflen,
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size_t offset)
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{
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return (linuxkpi_request_partial_firmware_into_buf(fw, fw_name,
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dev, buf, buflen, offset));
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}
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#define firmware linuxkpi_firmware
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#endif /* _LINUXKPI_LINUX_FIRMWARE_H */
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@ -2,6 +2,7 @@
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2020-2021 The FreeBSD Foundation
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* Copyright (c) 2022 Bjoern A. Zeeb
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*
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* This software was developed by Björn Zeeb under sponsorship from
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* the FreeBSD Foundation.
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@ -223,3 +224,26 @@ linuxkpi_release_firmware(const struct linuxkpi_firmware *fw)
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firmware_put(fw->fbdfw, FIRMWARE_UNLOAD);
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free(__DECONST(void *, fw), M_LKPI_FW);
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}
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int
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linuxkpi_request_partial_firmware_into_buf(const struct linuxkpi_firmware **fw,
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const char *fw_name, struct device *dev, uint8_t *buf, size_t buflen,
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size_t offset)
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{
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const struct linuxkpi_firmware *lfw;
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int error;
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error = linuxkpi_request_firmware(fw, fw_name, dev);
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if (error != 0)
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return (error);
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lfw = *fw;
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if ((offset + buflen) >= lfw->size) {
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linuxkpi_release_firmware(lfw);
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return (-ERANGE);
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}
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memcpy(buf, lfw->data + offset, buflen);
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return (0);
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}
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