staging/atomisp: Add support for the Intel IPU v2

This patch adds support for the Intel IPU v2 as found on Android and IoT
Baytrail-T and Baytrail-CR platforms (those with the IPU PCI mapped). You
will also need the firmware files from your device (Android usually puts
them into /etc) - or you can find them in the downloadable restore/upgrade
kits if you blew them away for some reason.

It may be possible to extend the driver to handle the BYT/T windows
platforms such as the ASUS T100TA. These platforms don't expose the IPU via
the PCI interface but via ACPI buried in the GPU description and with the
camera information somewhere unknown so would need a platform driver
interface adding to the codebase *IFF* the firmware works on such devices.

To get good results you also need a suitable support library such as
libxcam. The camera is intended to be driven from Android so it has a lot of
features that many desktop apps don't fully spport.

In theory all the pieces are there to build it with -DISP2401 and some
differing files to get CherryTrail/T support, but unifying the drivers
properlly is a work in progress.

The IPU driver represents the work of a lot of people within Intel over many
years. It's historical goal was portability rather than Linux upstream. Any
queries about the upstream aimed driver should be sent to me not to the
original authors.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 167 insertions, 0 deletions

diff --git a/drivers/staging/media/atomisp/pci/atomisp2/css2400/hive_isp_css_include/string_support.h b/drivers/staging/media/atomisp/pci/atomisp2/css2400/hive_isp_css_include/string_support.h
new file mode 100644
index 000000000000..568631698a3d
--- /dev/null
+++ b/drivers/staging/media/atomisp/pci/atomisp2/css2400/hive_isp_css_include/string_support.h
@@ -0,0 +1,167 @@
+/*
+ * Support for Intel Camera Imaging ISP subsystem.
+ * Copyright (c) 2015, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ */
+
+#ifndef __STRING_SUPPORT_H_INCLUDED__
+#define __STRING_SUPPORT_H_INCLUDED__
+#include <platform_support.h>
+#include <type_support.h>
+#include <storage_class.h>
+
+#if !defined(_MSC_VER)
+/*
+ * For all non microsoft cases, we need the following functions
+ */
+
+
+/** @brief Copy from src_buf to dest_buf.
+ *
+ * @param[out] dest_buf. Destination buffer to copy to
+ * @param[in]  dest_size. The size of the destination buffer in bytes
+ * @param[in]  src_buf. The source buffer
+ * @param[in]  src_size. The size of the source buffer in bytes
+ * @return     0 on success, error code on failure
+ * @return     EINVAL on Invalid arguments
+ * @return     ERANGE on Destination size too small
+ */
+STORAGE_CLASS_INLINE int memcpy_s(
+	void* dest_buf,
+	size_t dest_size,
+	const void* src_buf,
+	size_t src_size)
+{
+	if ((src_buf == NULL) || (dest_buf == NULL)) {
+		/* Invalid arguments*/
+		return EINVAL;
+	}
+
+	if ((dest_size < src_size) || (src_size == 0)) {
+		/* Destination too small*/
+		return ERANGE;
+	}
+
+	memcpy(dest_buf, src_buf, src_size);
+	return 0;
+}
+
+/** @brief Get the length of the string, excluding the null terminator
+ *
+ * @param[in]  src_str. The source string
+ * @param[in]  max_len. Look only for max_len bytes in the string
+ * @return     Return the string length excluding null character
+ * @return     Return max_len if no null character in the first max_len bytes
+ * @return     Returns 0 if src_str is NULL
+ */
+static size_t strnlen_s(
+	const char* src_str,
+	size_t max_len)
+{
+	size_t ix;
+	if (src_str == NULL) {
+		/* Invalid arguments*/
+		return 0;
+	}
+
+	for (ix=0;
+		((src_str[ix] != '\0') && (ix< max_len));
+		++ix) /*Nothing else to do*/;
+
+	/* On Error, it will return src_size == max_len*/
+	return ix;
+}
+
+/** @brief Copy string from src_str to dest_str
+ *
+ * @param[out] dest_str. Destination buffer to copy to
+ * @param[in]  dest_size. The size of the destination buffer in bytes
+ * @param[in]  src_str. The source buffer
+ * @param[in]  src_size. The size of the source buffer in bytes
+ * @return     Returns 0 on success
+ * @return     Returns EINVAL on invalid arguments
+ * @return     Returns ERANGE on destination size too small
+ */
+STORAGE_CLASS_INLINE int strncpy_s(
+	char* dest_str,
+	size_t dest_size,
+	const char* src_str,
+	size_t src_size)
+{
+	size_t len;
+	if (dest_str == NULL) {
+		/* Invalid arguments*/
+		return EINVAL;
+	}
+
+	if ((src_str == NULL) || (dest_size == 0)) {
+		/* Invalid arguments*/
+		dest_str[0] = '\0';
+		return EINVAL;
+	}
+
+	len = strnlen_s(src_str, src_size);
+
+	if (len >= dest_size) {
+		/* Destination too small*/
+		dest_str[0] = '\0';
+		return ERANGE;
+	}
+
+	/* dest_str is big enough for the len */
+	strncpy(dest_str, src_str, len);
+	dest_str[len+1] = '\0';
+	return 0;
+}
+
+/** @brief Copy string from src_str to dest_str
+ *
+ * @param[out] dest_str. Destination buffer to copy to
+ * @param[in]  dest_size. The size of the destination buffer in bytes
+ * @param[in]  src_str. The source buffer
+ * @return     Returns 0 on success
+ * @return     Returns EINVAL on invalid arguments
+ * @return     Returns ERANGE on destination size too small
+ */
+STORAGE_CLASS_INLINE int strcpy_s(
+	char* dest_str,
+	size_t dest_size,
+	const char* src_str)
+{
+	size_t len;
+	if (dest_str == NULL) {
+		/* Invalid arguments*/
+		return EINVAL;
+	}
+
+	if ((src_str == NULL) || (dest_size == 0)) {
+		/* Invalid arguments*/
+		dest_str[0] = '\0';
+		return EINVAL;
+	}
+
+	len = strnlen_s(src_str, dest_size);
+
+	if (len >= dest_size) {
+		/* Destination too small*/
+		dest_str[0] = '\0';
+		return ERANGE;
+	}
+
+	/* dest_str is big enough for the len */
+	strncpy(dest_str, src_str, len);
+	dest_str[len+1] = '\0';
+	return 0;
+}
+
+#endif /*!defined(_MSC_VER)*/
+
+#endif /* __STRING_SUPPORT_H_INCLUDED__ */