From 62bba5dd8181bed282967f1054ed5749b2c499f9 Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Sun, 6 May 2012 09:28:17 -0300 Subject: [PATCH] [media] gspca: Allow subdrivers to use the control framework Make the necessary changes to allow subdrivers to use the control framework. This does not add control event support, that comes later. It add a init_control cam_op that is called after init in probe that allows the subdriver to set up the controls. HdG: Call v4l2_ctrl_handler_setup from resume instead of gspca_set_default_mode, as we just want to resend the current ctrl values to the device. Signed-off-by: Hans Verkuil Signed-off-by: Hans de Goede Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/gspca/gspca.c | 36 +++++++++++++++++++++++-------- drivers/media/video/gspca/gspca.h | 1 + 2 files changed, 28 insertions(+), 9 deletions(-) diff --git a/drivers/media/video/gspca/gspca.c b/drivers/media/video/gspca/gspca.c index ca5a2b139d0b..d85c30dd37ad 100644 --- a/drivers/media/video/gspca/gspca.c +++ b/drivers/media/video/gspca/gspca.c @@ -38,6 +38,7 @@ #include #include #include +#include #include "gspca.h" @@ -1006,6 +1007,8 @@ static void gspca_set_default_mode(struct gspca_dev *gspca_dev) /* set the current control values to their default values * which may have changed in sd_init() */ + /* does nothing if ctrl_handler == NULL */ + v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler); ctrl = gspca_dev->cam.ctrls; if (ctrl != NULL) { for (i = 0; @@ -1323,6 +1326,7 @@ static void gspca_release(struct video_device *vfd) PDEBUG(D_PROBE, "%s released", video_device_node_name(&gspca_dev->vdev)); + v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler); kfree(gspca_dev->usb_buf); kfree(gspca_dev); } @@ -2347,6 +2351,14 @@ int gspca_dev_probe2(struct usb_interface *intf, gspca_dev->sd_desc = sd_desc; gspca_dev->nbufread = 2; gspca_dev->empty_packet = -1; /* don't check the empty packets */ + gspca_dev->vdev = gspca_template; + gspca_dev->vdev.parent = &intf->dev; + gspca_dev->module = module; + gspca_dev->present = 1; + + mutex_init(&gspca_dev->usb_lock); + mutex_init(&gspca_dev->queue_lock); + init_waitqueue_head(&gspca_dev->wq); /* configure the subdriver and initialize the USB device */ ret = sd_desc->config(gspca_dev, id); @@ -2355,6 +2367,10 @@ int gspca_dev_probe2(struct usb_interface *intf, if (gspca_dev->cam.ctrls != NULL) ctrls_init(gspca_dev); ret = sd_desc->init(gspca_dev); + if (ret < 0) + goto out; + if (sd_desc->init_controls) + ret = sd_desc->init_controls(gspca_dev); if (ret < 0) goto out; gspca_set_default_mode(gspca_dev); @@ -2363,15 +2379,7 @@ int gspca_dev_probe2(struct usb_interface *intf, if (ret) goto out; - mutex_init(&gspca_dev->usb_lock); - mutex_init(&gspca_dev->queue_lock); - init_waitqueue_head(&gspca_dev->wq); - /* init video stuff */ - memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template); - gspca_dev->vdev.parent = &intf->dev; - gspca_dev->module = module; - gspca_dev->present = 1; ret = video_register_device(&gspca_dev->vdev, VFL_TYPE_GRABBER, -1); @@ -2391,6 +2399,7 @@ out: if (gspca_dev->input_dev) input_unregister_device(gspca_dev->input_dev); #endif + v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler); kfree(gspca_dev->usb_buf); kfree(gspca_dev); return ret; @@ -2489,11 +2498,20 @@ EXPORT_SYMBOL(gspca_suspend); int gspca_resume(struct usb_interface *intf) { struct gspca_dev *gspca_dev = usb_get_intfdata(intf); + int streaming; gspca_dev->frozen = 0; gspca_dev->sd_desc->init(gspca_dev); gspca_input_create_urb(gspca_dev); - if (gspca_dev->streaming) + /* + * Most subdrivers send all ctrl values on sd_start and thus + * only write to the device registers on s_ctrl when streaming -> + * Clear streaming to avoid setting all ctrls twice. + */ + streaming = gspca_dev->streaming; + gspca_dev->streaming = 0; + v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler); + if (streaming) return gspca_init_transfer(gspca_dev); return 0; } diff --git a/drivers/media/video/gspca/gspca.h b/drivers/media/video/gspca/gspca.h index 589009f4496f..81404160ca43 100644 --- a/drivers/media/video/gspca/gspca.h +++ b/drivers/media/video/gspca/gspca.h @@ -115,6 +115,7 @@ struct sd_desc { /* mandatory operations */ cam_cf_op config; /* called on probe */ cam_op init; /* called on probe and resume */ + cam_op init_controls; /* called on probe */ cam_op start; /* called on stream on after URBs creation */ cam_pkt_op pkt_scan; /* optional operations */ -- 2.30.2