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V4L/DVB (7593): em28xx: add a module to handle dvb
This patch adds em28xx-dvb. This driver is highly based on cx88-dvb and saa7134-dvb. This code currently loads and unloads successfully. However, some changes are needed to properly support the mpeg streams and to setup em28xx to work on DVB mode. Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
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Mauro Carvalho Chehab
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Apr 24, 2008
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,157 @@ | ||
| /* | ||
| DVB device driver for em28xx | ||
| (c) 2008 Mauro Carvalho Chehab <mchehab@infradead.org> | ||
| Based on cx88-dvb and saa7134-dvb originally written by: | ||
| (c) 2004, 2005 Chris Pascoe <c.pascoe@itee.uq.edu.au> | ||
| (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs] | ||
| This program is free software; you can redistribute it and/or modify | ||
| it under the terms of the GNU General Public License as published by | ||
| the Free Software Foundation; either version 2 of the License. | ||
| */ | ||
|
|
||
| #include <linux/kernel.h> | ||
| #include <linux/usb.h> | ||
|
|
||
| #include "em28xx.h" | ||
| #include <media/v4l2-common.h> | ||
| #include <media/videobuf-vmalloc.h> | ||
|
|
||
| #include "lgdt330x.h" | ||
| #include "tuner-xc2028.h" | ||
| #include "tuner-xc2028-types.h" | ||
|
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| MODULE_DESCRIPTION("driver for em28xx based DVB cards"); | ||
| MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>"); | ||
| MODULE_LICENSE("GPL"); | ||
|
|
||
| static unsigned int debug; | ||
| module_param(debug, int, 0644); | ||
| MODULE_PARM_DESC(debug, "enable debug messages [dvb]"); | ||
|
|
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| DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr); | ||
|
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| #define dprintk(level, fmt, arg...) do { \ | ||
| if (debug >= level) \ | ||
| printk(KERN_DEBUG "%s/2-dvb: " fmt, dev->name, ## arg) \ | ||
| } while (0) | ||
|
|
||
| static int | ||
| buffer_setup(struct videobuf_queue *vq, unsigned int *count, unsigned int *size) | ||
| { | ||
| struct em28xx_fh *fh = vq->priv_data; | ||
| struct em28xx *dev = fh->dev; | ||
|
|
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| *size = 16 * fh->dev->width * fh->dev->height >> 3; | ||
| if (0 == *count) | ||
| *count = EM28XX_DEF_BUF; | ||
|
|
||
| if (*count < EM28XX_MIN_BUF) | ||
| *count = EM28XX_MIN_BUF; | ||
|
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| dev->mode = EM28XX_DIGITAL_MODE; | ||
|
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| return 0; | ||
| } | ||
|
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| /* ------------------------------------------------------------------ */ | ||
|
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| /* Add demods here */ | ||
|
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| /* ------------------------------------------------------------------ */ | ||
|
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| static int attach_xc3028(u8 addr, struct em28xx *dev) | ||
| { | ||
| struct dvb_frontend *fe; | ||
| struct xc2028_ctrl ctl; | ||
| struct xc2028_config cfg = { | ||
| .i2c_adap = &dev->i2c_adap, | ||
| .i2c_addr = addr, | ||
| .ctrl = &ctl, | ||
| }; | ||
|
|
||
| if (!dev->dvb.frontend) { | ||
| printk(KERN_ERR "%s/2: dvb frontend not attached. " | ||
| "Can't attach xc3028\n", | ||
| dev->name); | ||
| return -EINVAL; | ||
| } | ||
|
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| fe = dvb_attach(xc2028_attach, dev->dvb.frontend, &cfg); | ||
| if (!fe) { | ||
| printk(KERN_ERR "%s/2: xc3028 attach failed\n", | ||
| dev->name); | ||
| dvb_frontend_detach(dev->dvb.frontend); | ||
| dvb_unregister_frontend(dev->dvb.frontend); | ||
| dev->dvb.frontend = NULL; | ||
| return -EINVAL; | ||
| } | ||
|
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| printk(KERN_INFO "%s/2: xc3028 attached\n", dev->name); | ||
|
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| return 0; | ||
| } | ||
|
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| static int dvb_init(struct em28xx *dev) | ||
| { | ||
| /* init struct videobuf_dvb */ | ||
| dev->dvb.name = dev->name; | ||
|
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| dev->qops->buf_setup = buffer_setup; | ||
|
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| videobuf_queue_vmalloc_init(&dev->dvb.dvbq, dev->qops, | ||
| &dev->udev->dev, &dev->slock, | ||
| V4L2_BUF_TYPE_VIDEO_CAPTURE, | ||
| V4L2_FIELD_ALTERNATE, | ||
| sizeof(struct em28xx_buffer), dev); | ||
|
|
||
| /* init frontend */ | ||
| switch (dev->model) { | ||
| default: | ||
| printk(KERN_ERR "%s/2: The frontend of your DVB/ATSC card" | ||
| " isn't supported yet\n", | ||
| dev->name); | ||
| break; | ||
| } | ||
| if (NULL == dev->dvb.frontend) { | ||
| printk(KERN_ERR | ||
| "%s/2: frontend initialization failed\n", | ||
| dev->name); | ||
| return -EINVAL; | ||
| } | ||
|
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||
| /* register everything */ | ||
| return videobuf_dvb_register(&dev->dvb, THIS_MODULE, dev, | ||
| &dev->udev->dev, | ||
| adapter_nr); | ||
| } | ||
|
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||
| static int dvb_fini(struct em28xx *dev) | ||
| { | ||
| if (dev->dvb.frontend) | ||
| videobuf_dvb_unregister(&dev->dvb); | ||
|
|
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| return 0; | ||
| } | ||
|
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| static struct em28xx_ops dvb_ops = { | ||
| .id = EM28XX_DVB, | ||
| .name = "Em28xx dvb Extension", | ||
| .init = dvb_init, | ||
| .fini = dvb_fini, | ||
| }; | ||
|
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| static int __init em28xx_dvb_register(void) | ||
| { | ||
| return em28xx_register_extension(&dvb_ops); | ||
| } | ||
|
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| static void __exit em28xx_dvb_unregister(void) | ||
| { | ||
| em28xx_unregister_extension(&dvb_ops); | ||
| } | ||
|
|
||
| module_init(em28xx_dvb_register); | ||
| module_exit(em28xx_dvb_unregister); |
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