Add suspend/resume support to the via-camera driver, so that the video
continues streaming over a suspend-resume cycle.
Originally implemented by Jon Corbet.
Signed-off-by: Daniel Drake <d...@laptop.org>
---
drivers/media/video/via-camera.c | 64 ++++++++++++++++++++++++++++++++++++++
1 files changed, 64 insertions(+), 0 deletions(-)
diff --git a/drivers/media/video/via-camera.c b/drivers/media/video/via-camera.c
index 2f973cd..f307e5f 100644
--- a/drivers/media/video/via-camera.c
+++ b/drivers/media/video/via-camera.c
@@ -1246,6 +1246,62 @@ static const struct v4l2_ioctl_ops viacam_ioctl_ops = {
/*
* Power management.
*/
+#ifdef CONFIG_PM
+
+static int viacam_suspend(void *priv)
+{
+ struct via_camera *cam = priv;
+ enum viacam_opstate state = cam->opstate;
+
+ if (cam->opstate != S_IDLE) {
+ viacam_stop_engine(cam);
+ cam->opstate = state; /* So resume restarts */
+ }
+
+ return 0;
+}
+
+static int viacam_resume(void *priv)
+{
+ struct via_camera *cam = priv;
+ int ret = 0;
+
+ /*
+ * Get back to a reasonable operating state.
+ */
+ via_write_reg_mask(VIASR, 0x78, 0, 0x80);
+ via_write_reg_mask(VIASR, 0x1e, 0xc0, 0xc0);
+ viacam_int_disable(cam);
+ set_bit(CF_CONFIG_NEEDED, &cam->flags);
+ /*
+ * Make sure the sensor's power state is correct
+ */
+ if (cam->users > 0)
+ via_sensor_power_up(cam);
+ else
+ via_sensor_power_down(cam);
+ /*
+ * If it was operating, try to restart it.
+ */
+ if (cam->opstate != S_IDLE) {
+ mutex_lock(&cam->lock);
+ ret = viacam_configure_sensor(cam);
+ if (! ret)
+ ret = viacam_config_controller(cam);
+ mutex_unlock(&cam->lock);
+ if (! ret)
+ viacam_start_engine(cam);
+ }
+
+ return ret;
+}
+
+static struct viafb_pm_hooks viacam_pm_hooks = {
+ .suspend = viacam_suspend,
+ .resume = viacam_resume
+};
+
+#endif /* CONFIG_PM */
/*
* Setup stuff.
@@ -1369,6 +1425,14 @@ static __devinit int viacam_probe(struct platform_device
*pdev)
goto out_irq;
video_set_drvdata(&cam->vdev, cam);
+#ifdef CONFIG_PM
+ /*
+ * Hook into PM events
+ */
+ viacam_pm_hooks.private = cam;
+ viafb_pm_register(&viacam_pm_hooks);
+#endif
+
/* Power the sensor down until somebody opens the device */
via_sensor_power_down(cam);
return 0;
--
1.7.4
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