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path: root/drivers/media/video/mt9t031.c
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Diffstat (limited to 'drivers/media/video/mt9t031.c')
-rw-r--r--drivers/media/video/mt9t031.c66
1 files changed, 62 insertions, 4 deletions
diff --git a/drivers/media/video/mt9t031.c b/drivers/media/video/mt9t031.c
index a9061bff79b..78b4e091d2d 100644
--- a/drivers/media/video/mt9t031.c
+++ b/drivers/media/video/mt9t031.c
@@ -8,14 +8,16 @@
* published by the Free Software Foundation.
*/
-#include <linux/videodev2.h>
-#include <linux/slab.h>
+#include <linux/device.h>
#include <linux/i2c.h>
#include <linux/log2.h>
+#include <linux/pm.h>
+#include <linux/slab.h>
+#include <linux/videodev2.h>
-#include <media/v4l2-subdev.h>
-#include <media/v4l2-chip-ident.h>
#include <media/soc_camera.h>
+#include <media/v4l2-chip-ident.h>
+#include <media/v4l2-subdev.h>
/*
* mt9t031 i2c address 0x5d
@@ -681,12 +683,66 @@ static int mt9t031_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
}
/*
+ * Power Management:
+ * This function does nothing for now but must be present for pm to work
+ */
+static int mt9t031_runtime_suspend(struct device *dev)
+{
+ return 0;
+}
+
+/*
+ * Power Management:
+ * COLUMN_ADDRESS_MODE and ROW_ADDRESS_MODE are not rewritten if unchanged
+ * they are however changed at reset if the platform hook is present
+ * thus we rewrite them with the values stored by the driver
+ */
+static int mt9t031_runtime_resume(struct device *dev)
+{
+ struct video_device *vdev = to_video_device(dev);
+ struct soc_camera_device *icd = container_of(vdev->parent,
+ struct soc_camera_device, dev);
+ struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
+ struct i2c_client *client = sd->priv;
+ struct mt9t031 *mt9t031 = to_mt9t031(client);
+
+ int ret;
+ u16 xbin, ybin;
+
+ xbin = min(mt9t031->xskip, (u16)3);
+ ybin = min(mt9t031->yskip, (u16)3);
+
+ ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE,
+ ((xbin - 1) << 4) | (mt9t031->xskip - 1));
+ if (ret < 0)
+ return ret;
+
+ ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE,
+ ((ybin - 1) << 4) | (mt9t031->yskip - 1));
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static struct dev_pm_ops mt9t031_dev_pm_ops = {
+ .runtime_suspend = mt9t031_runtime_suspend,
+ .runtime_resume = mt9t031_runtime_resume,
+};
+
+static struct device_type mt9t031_dev_type = {
+ .name = "MT9T031",
+ .pm = &mt9t031_dev_pm_ops,
+};
+
+/*
* Interface active, can use i2c. If it fails, it can indeed mean, that
* this wasn't our capture interface, so, we wait for the right one
*/
static int mt9t031_video_probe(struct i2c_client *client)
{
struct mt9t031 *mt9t031 = to_mt9t031(client);
+ struct video_device *vdev = soc_camera_i2c_to_vdev(client);
s32 data;
int ret;
@@ -712,6 +768,8 @@ static int mt9t031_video_probe(struct i2c_client *client)
ret = mt9t031_idle(client);
if (ret < 0)
dev_err(&client->dev, "Failed to initialise the camera\n");
+ else
+ vdev->dev.type = &mt9t031_dev_type;
/* mt9t031_idle() has reset the chip to default. */
mt9t031->exposure = 255;