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189 lines
6.2 KiB
189 lines
6.2 KiB
From 75f2608b89d80e627d50aca40f2124253a8275b0 Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dsteve@broadcom.com>
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Date: Mon, 9 Dec 2013 10:58:01 +0000
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Subject: [PATCH 131/174] V4L2: Fix EV values. Add manual shutter speed control
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V4L2 EV values should be in units of 1/1000. Corrected.
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Add support for V4L2_CID_EXPOSURE_ABSOLUTE which should
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give manual shutter control. Requires manual exposure mode
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to be selected first.
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Signed-off-by: Dave Stevenson <dsteve@broadcom.com>
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---
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drivers/media/platform/bcm2835/bcm2835-camera.h | 4 +-
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drivers/media/platform/bcm2835/controls.c | 94 ++++++++++++++++++------
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drivers/media/platform/bcm2835/mmal-parameters.h | 1 +
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3 files changed, 76 insertions(+), 23 deletions(-)
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--- a/drivers/media/platform/bcm2835/bcm2835-camera.h
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+++ b/drivers/media/platform/bcm2835/bcm2835-camera.h
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@@ -15,7 +15,7 @@
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* core driver device
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*/
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-#define V4L2_CTRL_COUNT 18 /* number of v4l controls */
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+#define V4L2_CTRL_COUNT 19 /* number of v4l controls */
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enum {
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MMAL_COMPONENT_CAMERA = 0,
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@@ -51,6 +51,8 @@ struct bm2835_mmal_dev {
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struct mmal_colourfx colourfx;
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int hflip;
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int vflip;
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+ enum mmal_parameter_exposuremode exposure_mode;
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+ unsigned int manual_shutter_speed;
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/* allocated mmal instance and components */
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struct vchiq_mmal_instance *instance;
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--- a/drivers/media/platform/bcm2835/controls.c
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+++ b/drivers/media/platform/bcm2835/controls.c
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@@ -30,11 +30,23 @@
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#include "mmal-parameters.h"
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#include "bcm2835-camera.h"
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-/* The supported V4L2_CID_AUTO_EXPOSURE_BIAS values are from -24 to +24.
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- * These are in 1/6th increments so the effective range is -4.0EV to +4.0EV.
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+/* The supported V4L2_CID_AUTO_EXPOSURE_BIAS values are from -4.0 to +4.0.
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+ * MMAL values are in 1/6th increments so the MMAL range is -24 to +24.
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+ * V4L2 docs say value "is expressed in terms of EV, drivers should interpret
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+ * the values as 0.001 EV units, where the value 1000 stands for +1 EV."
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+ * V4L2 is limited to a max of 32 values in a menu, so count in 1/3rds from
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+ * -4 to +4
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*/
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static const s64 ev_bias_qmenu[] = {
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- -24, -21, -18, -15, -12, -9, -6, -3, 0, 3, 6, 9, 12, 15, 18, 21, 24
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+ -4000, -3667, -3333,
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+ -3000, -2667, -2333,
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+ -2000, -1667, -1333,
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+ -1000, -667, -333,
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+ 0, 333, 667,
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+ 1000, 1333, 1667,
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+ 2000, 2333, 2667,
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+ 3000, 3333, 3667,
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+ 4000
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};
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/* Supported ISO values
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@@ -166,6 +178,22 @@ static int ctrl_set_value(struct bm2835_
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&u32_value, sizeof(u32_value));
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}
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+static int ctrl_set_value_ev(struct bm2835_mmal_dev *dev,
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+ struct v4l2_ctrl *ctrl,
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+ const struct bm2835_mmal_v4l2_ctrl *mmal_ctrl)
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+{
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+ s32 s32_value;
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+ struct vchiq_mmal_port *control;
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+
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+ control = &dev->component[MMAL_COMPONENT_CAMERA]->control;
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+
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+ s32_value = (ctrl->val-12)*2; /* Convert from index to 1/6ths */
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+
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+ return vchiq_mmal_port_parameter_set(dev->instance, control,
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+ mmal_ctrl->mmal_id,
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+ &s32_value, sizeof(s32_value));
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+}
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+
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static int ctrl_set_rotate(struct bm2835_mmal_dev *dev,
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struct v4l2_ctrl *ctrl,
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const struct bm2835_mmal_v4l2_ctrl *mmal_ctrl)
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@@ -245,34 +273,50 @@ static int ctrl_set_exposure(struct bm28
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struct v4l2_ctrl *ctrl,
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const struct bm2835_mmal_v4l2_ctrl *mmal_ctrl)
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{
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- u32 u32_value;
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+ enum mmal_parameter_exposuremode exp_mode = dev->exposure_mode;
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+ u32 shutter_speed = 0;
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struct vchiq_mmal_port *control;
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+ int ret = 0;
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control = &dev->component[MMAL_COMPONENT_CAMERA]->control;
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- switch (ctrl->val) {
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- case V4L2_EXPOSURE_AUTO:
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- u32_value = MMAL_PARAM_EXPOSUREMODE_AUTO;
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- break;
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-
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- case V4L2_EXPOSURE_MANUAL:
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- u32_value = MMAL_PARAM_EXPOSUREMODE_OFF;
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- break;
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-
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- case V4L2_EXPOSURE_SHUTTER_PRIORITY:
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- u32_value = MMAL_PARAM_EXPOSUREMODE_SPORTS;
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- break;
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-
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- case V4L2_EXPOSURE_APERTURE_PRIORITY:
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- u32_value = MMAL_PARAM_EXPOSUREMODE_NIGHT;
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- break;
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+ if (mmal_ctrl->mmal_id == MMAL_PARAMETER_SHUTTER_SPEED) {
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+ /* V4L2 is in 100usec increments.
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+ * MMAL is 1usec.
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+ */
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+ dev->manual_shutter_speed = ctrl->val * 100;
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+ } else if (mmal_ctrl->mmal_id == MMAL_PARAMETER_EXPOSURE_MODE) {
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+ switch (ctrl->val) {
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+ case V4L2_EXPOSURE_AUTO:
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+ exp_mode = MMAL_PARAM_EXPOSUREMODE_AUTO;
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+ break;
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+
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+ case V4L2_EXPOSURE_MANUAL:
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+ exp_mode = MMAL_PARAM_EXPOSUREMODE_OFF;
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+ break;
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+
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+ case V4L2_EXPOSURE_SHUTTER_PRIORITY:
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+ exp_mode = MMAL_PARAM_EXPOSUREMODE_SPORTS;
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+ break;
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+
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+ case V4L2_EXPOSURE_APERTURE_PRIORITY:
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+ exp_mode = MMAL_PARAM_EXPOSUREMODE_NIGHT;
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+ break;
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+ }
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+ dev->exposure_mode = exp_mode;
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}
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- /* todo: what about the other ten modes there are MMAL parameters for */
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- return vchiq_mmal_port_parameter_set(dev->instance, control,
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- mmal_ctrl->mmal_id,
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- &u32_value, sizeof(u32_value));
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+ if (dev->exposure_mode == MMAL_PARAM_EXPOSUREMODE_OFF)
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+ shutter_speed = dev->manual_shutter_speed;
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+
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+ ret = vchiq_mmal_port_parameter_set(dev->instance, control,
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+ MMAL_PARAMETER_SHUTTER_SPEED,
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+ &shutter_speed, sizeof(shutter_speed));
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+ ret += vchiq_mmal_port_parameter_set(dev->instance, control,
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+ MMAL_PARAMETER_EXPOSURE_MODE,
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+ &exp_mode, sizeof(u32));
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+ return ret;
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}
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static int ctrl_set_metering_mode(struct bm2835_mmal_dev *dev,
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@@ -578,10 +622,16 @@ static const struct bm2835_mmal_v4l2_ctr
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},
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*/
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{
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+ V4L2_CID_EXPOSURE_ABSOLUTE, MMAL_CONTROL_TYPE_STD,
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+ /* Units of 100usecs */
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+ 1, 1*1000*10, 100*10, 1, NULL,
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+ MMAL_PARAMETER_SHUTTER_SPEED, &ctrl_set_exposure
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+ },
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+ {
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V4L2_CID_AUTO_EXPOSURE_BIAS, MMAL_CONTROL_TYPE_INT_MENU,
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0, ARRAY_SIZE(ev_bias_qmenu) - 1,
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(ARRAY_SIZE(ev_bias_qmenu)+1)/2 - 1, 0, ev_bias_qmenu,
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- MMAL_PARAMETER_EXPOSURE_COMP, &ctrl_set_value
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+ MMAL_PARAMETER_EXPOSURE_COMP, &ctrl_set_value_ev
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},
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{
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V4L2_CID_EXPOSURE_METERING,
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--- a/drivers/media/platform/bcm2835/mmal-parameters.h
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+++ b/drivers/media/platform/bcm2835/mmal-parameters.h
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@@ -161,6 +161,7 @@ enum mmal_parameter_camera_type {
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MMAL_PARAMETER_SW_SHARPEN_DISABLE, /**< @ref MMAL_PARAMETER_BOOLEAN_T */
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MMAL_PARAMETER_FLASH_REQUIRED, /**< @ref MMAL_PARAMETER_BOOLEAN_T */
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MMAL_PARAMETER_SW_SATURATION_DISABLE, /**< @ref MMAL_PARAMETER_BOOLEAN_T */
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+ MMAL_PARAMETER_SHUTTER_SPEED /**< Takes a @ref MMAL_PARAMETER_UINT32_T */
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};
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enum mmal_parameter_camera_config_timestamp_mode {
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