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, 78 insertions, 0 deletions

diff --git a/drivers/staging/media/atomisp/pci/atomisp2/css2400/ia_css_tpg.h b/drivers/staging/media/atomisp/pci/atomisp2/css2400/ia_css_tpg.h
new file mode 100644
index 0000000..9238a33
--- /dev/null
+++ b/drivers/staging/media/atomisp/pci/atomisp2/css2400/ia_css_tpg.h
@@ -0,0 +1,78 @@
+/*
+ * 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 __IA_CSS_TPG_H
+#define __IA_CSS_TPG_H
+
+/** @file
+ * This file contains support for the test pattern generator (TPG)
+ */
+
+/** Enumerate the TPG IDs.
+ */
+enum ia_css_tpg_id {
+	IA_CSS_TPG_ID0,
+	IA_CSS_TPG_ID1,
+	IA_CSS_TPG_ID2
+};
+
+/**
+ * Maximum number of TPG IDs.
+ *
+ * Make sure the value of this define gets changed to reflect the correct
+ * number of ia_css_tpg_id enum if you add/delete an item in the enum.
+ */
+#define N_CSS_TPG_IDS (IA_CSS_TPG_ID2+1)
+
+/** Enumerate the TPG modes.
+ */
+enum ia_css_tpg_mode {
+	IA_CSS_TPG_MODE_RAMP,
+	IA_CSS_TPG_MODE_CHECKERBOARD,
+	IA_CSS_TPG_MODE_FRAME_BASED_COLOR,
+	IA_CSS_TPG_MODE_MONO
+};
+
+/** @brief Configure the test pattern generator.
+ *
+ * Configure the Test Pattern Generator, the way these values are used to
+ * generate the pattern can be seen in the HRT extension for the test pattern
+ * generator:
+ * devices/test_pat_gen/hrt/include/test_pat_gen.h: hrt_calc_tpg_data().
+ *
+ * This interface is deprecated, it is not portable -> move to input system API
+ *
+@code
+unsigned int test_pattern_value(unsigned int x, unsigned int y)
+{
+ unsigned int x_val, y_val;
+ if (x_delta > 0) (x_val = (x << x_delta) & x_mask;
+ else (x_val = (x >> -x_delta) & x_mask;
+ if (y_delta > 0) (y_val = (y << y_delta) & y_mask;
+ else (y_val = (y >> -y_delta) & x_mask;
+ return (x_val + y_val) & xy_mask;
+}
+@endcode
+ */
+struct ia_css_tpg_config {
+	enum ia_css_tpg_id   id;
+	enum ia_css_tpg_mode mode;
+	unsigned int         x_mask;
+	int                  x_delta;
+	unsigned int         y_mask;
+	int                  y_delta;
+	unsigned int         xy_mask;
+};
+
+#endif /* __IA_CSS_TPG_H */