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>

1 files changed, 157 insertions, 0 deletions

diff --git a/drivers/media/video/em28xx/em28xx-dvb.c b/drivers/media/video/em28xx/em28xx-dvb.c
new file mode 100644
index 00000000000..1ffe64f6209
--- /dev/null
+++ b/drivers/media/video/em28xx/em28xx-dvb.c
@@ -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"
+
+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]");
+
+DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);
+
+#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;
+
+        *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;
+
+        dev->mode = EM28XX_DIGITAL_MODE;
+
+        return 0;
+}
+
+/* ------------------------------------------------------------------ */
+
+/* Add demods here */
+
+/* ------------------------------------------------------------------ */
+
+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;
+        }
+
+        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;
+        }
+
+        printk(KERN_INFO "%s/2: xc3028 attached\n", dev->name);
+
+        return 0;
+}
+
+static int dvb_init(struct em28xx *dev)
+{
+        /* init struct videobuf_dvb */
+        dev->dvb.name = dev->name;
+
+        dev->qops->buf_setup = buffer_setup;
+
+        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;
+        }
+
+        /* register everything */
+        return videobuf_dvb_register(&dev->dvb, THIS_MODULE, dev,
+                                     &dev->udev->dev,
+                                     adapter_nr);
+}
+
+static int dvb_fini(struct em28xx *dev)
+{
+        if (dev->dvb.frontend)
+                videobuf_dvb_unregister(&dev->dvb);
+
+        return 0;
+}
+
+static struct em28xx_ops dvb_ops = {
+        .id   = EM28XX_DVB,
+        .name = "Em28xx dvb Extension",
+        .init = dvb_init,
+        .fini = dvb_fini,
+};
+
+static int __init em28xx_dvb_register(void)
+{
+        return em28xx_register_extension(&dvb_ops);
+}
+
+static void __exit em28xx_dvb_unregister(void)
+{
+        em28xx_unregister_extension(&dvb_ops);
+}
+
+module_init(em28xx_dvb_register);
+module_exit(em28xx_dvb_unregister);