[media] media: platform: add VPFE capture driver support for AM437X

This patch adds Video Processing Front End (VPFE) driver for
AM437X family of devices
Driver supports the following:
- V4L2 API using MMAP buffer access based on videobuf2 api
- Asynchronous sensor/decoder sub device registration
- DT support

Signed-off-by: Benoit Parrot <bparrot@ti.com>
Signed-off-by: Darren Etheridge <detheridge@ti.com>
Signed-off-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
[hans.verkuil@cisco.com: swapped two lines to fix vpfe_release() & add pinctrl include]
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

2 files changed, 123 insertions, 0 deletions

diff --git a/include/uapi/linux/Kbuild b/include/uapi/linux/Kbuild
index 00b100023c47..9312d5806541 100644
--- a/include/uapi/linux/Kbuild
+++ b/include/uapi/linux/Kbuild
@@ -35,6 +35,7 @@ header-y += adfs_fs.h
 header-y += affs_hardblocks.h
 header-y += agpgart.h
 header-y += aio_abi.h
+header-y += am437x-vpfe.h
 header-y += apm_bios.h
 header-y += arcfb.h
 header-y += atalk.h
diff --git a/include/uapi/linux/am437x-vpfe.h b/include/uapi/linux/am437x-vpfe.h
new file mode 100644
index 000000000000..9b03033f9cd6
--- /dev/null
+++ b/include/uapi/linux/am437x-vpfe.h
@@ -0,0 +1,122 @@
+/*
+ * Copyright (C) 2013 - 2014 Texas Instruments, Inc.
+ *
+ * Benoit Parrot <bparrot@ti.com>
+ * Lad, Prabhakar <prabhakar.csengg@gmail.com>
+ *
+ * This program is free software; you may redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef AM437X_VPFE_USER_H
+#define AM437X_VPFE_USER_H
+
+enum vpfe_ccdc_data_size {
+        VPFE_CCDC_DATA_16BITS = 0,
+        VPFE_CCDC_DATA_15BITS,
+        VPFE_CCDC_DATA_14BITS,
+        VPFE_CCDC_DATA_13BITS,
+        VPFE_CCDC_DATA_12BITS,
+        VPFE_CCDC_DATA_11BITS,
+        VPFE_CCDC_DATA_10BITS,
+        VPFE_CCDC_DATA_8BITS,
+};
+
+/* enum for No of pixel per line to be avg. in Black Clamping*/
+enum vpfe_ccdc_sample_length {
+        VPFE_CCDC_SAMPLE_1PIXELS = 0,
+        VPFE_CCDC_SAMPLE_2PIXELS,
+        VPFE_CCDC_SAMPLE_4PIXELS,
+        VPFE_CCDC_SAMPLE_8PIXELS,
+        VPFE_CCDC_SAMPLE_16PIXELS,
+};
+
+/* enum for No of lines in Black Clamping */
+enum vpfe_ccdc_sample_line {
+        VPFE_CCDC_SAMPLE_1LINES = 0,
+        VPFE_CCDC_SAMPLE_2LINES,
+        VPFE_CCDC_SAMPLE_4LINES,
+        VPFE_CCDC_SAMPLE_8LINES,
+        VPFE_CCDC_SAMPLE_16LINES,
+};
+
+/* enum for Alaw gamma width */
+enum vpfe_ccdc_gamma_width {
+        VPFE_CCDC_GAMMA_BITS_15_6 = 0,  /* use bits 15-6 for gamma */
+        VPFE_CCDC_GAMMA_BITS_14_5,
+        VPFE_CCDC_GAMMA_BITS_13_4,
+        VPFE_CCDC_GAMMA_BITS_12_3,
+        VPFE_CCDC_GAMMA_BITS_11_2,
+        VPFE_CCDC_GAMMA_BITS_10_1,
+        VPFE_CCDC_GAMMA_BITS_09_0,      /* use bits 9-0 for gamma */
+};
+
+/* structure for ALaw */
+struct vpfe_ccdc_a_law {
+        /* Enable/disable A-Law */
+        unsigned char enable;
+        /* Gamma Width Input */
+        enum vpfe_ccdc_gamma_width gamma_wd;
+};
+
+/* structure for Black Clamping */
+struct vpfe_ccdc_black_clamp {
+        unsigned char enable;
+        /* only if bClampEnable is TRUE */
+        enum vpfe_ccdc_sample_length sample_pixel;
+        /* only if bClampEnable is TRUE */
+        enum vpfe_ccdc_sample_line sample_ln;
+        /* only if bClampEnable is TRUE */
+        unsigned short start_pixel;
+        /* only if bClampEnable is TRUE */
+        unsigned short sgain;
+        /* only if bClampEnable is FALSE */
+        unsigned short dc_sub;
+};
+
+/* structure for Black Level Compensation */
+struct vpfe_ccdc_black_compensation {
+        /* Constant value to subtract from Red component */
+        char r;
+        /* Constant value to subtract from Gr component */
+        char gr;
+        /* Constant value to subtract from Blue component */
+        char b;
+        /* Constant value to subtract from Gb component */
+        char gb;
+};
+
+/* Structure for CCDC configuration parameters for raw capture mode passed
+ * by application
+ */
+struct vpfe_ccdc_config_params_raw {
+        /* data size value from 8 to 16 bits */
+        enum vpfe_ccdc_data_size data_sz;
+        /* Structure for Optional A-Law */
+        struct vpfe_ccdc_a_law alaw;
+        /* Structure for Optical Black Clamp */
+        struct vpfe_ccdc_black_clamp blk_clamp;
+        /* Structure for Black Compensation */
+        struct vpfe_ccdc_black_compensation blk_comp;
+};
+
+/*
+ *  Private IOCTL
+ * VIDIOC_AM437X_CCDC_CFG - Set CCDC configuration for raw capture
+ * This is an experimental ioctl that will change in future kernels. So use
+ * this ioctl with care !
+ **/
+#define VIDIOC_AM437X_CCDC_CFG \
+        _IOW('V', BASE_VIDIOC_PRIVATE + 1, void *)
+
+#endif          /* AM437X_VPFE_USER_H */