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Commit 0522921c authored by Daniel Drake's avatar Daniel Drake Committed by Mauro Carvalho Chehab
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[media] via-camera: Add suspend/resume support 



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.

[mchehab@redhat.com: fix a small CodingStyle issue]
Signed-off-by: default avatarDaniel Drake <dsd@laptop.org>
Acked-by: default avatarJonathan Corbet <corbet@lwn.net>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 498e677c

drivers/media/video/via-camera.c

+64 −0
Original line number Diff line number Diff line
@@ -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;