1/*
2 * ngene-dvb.c: nGene PCIe bridge driver - DVB functions
3 *
4 * Copyright (C) 2005-2007 Micronas
5 *
6 * Copyright (C) 2008-2009 Ralph Metzler <rjkm@metzlerbros.de>
7 *                         Modifications for new nGene firmware,
8 *                         support for EEPROM-copying,
9 *                         support for new dual DVB-S2 card prototype
10 *
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * version 2 only, as published by the Free Software Foundation.
15 *
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20 * GNU General Public License for more details.
21 *
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
26 * 02110-1301, USA
27 * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
28 */
29
30#include <linux/module.h>
31#include <linux/init.h>
32#include <linux/delay.h>
33#include <linux/slab.h>
34#include <linux/poll.h>
35#include <linux/io.h>
36#include <asm/div64.h>
37#include <linux/pci.h>
38#include <linux/timer.h>
39#include <linux/byteorder/generic.h>
40#include <linux/firmware.h>
41#include <linux/vmalloc.h>
42
43#include "ngene.h"
44
45
46/****************************************************************************/
47/* COMMAND API interface ****************************************************/
48/****************************************************************************/
49
50static ssize_t ts_write(struct file *file, const char __user *buf,
51			size_t count, loff_t *ppos)
52{
53	struct dvb_device *dvbdev = file->private_data;
54	struct ngene_channel *chan = dvbdev->priv;
55	struct ngene *dev = chan->dev;
56
57	if (wait_event_interruptible(dev->tsout_rbuf.queue,
58				     dvb_ringbuffer_free
59				     (&dev->tsout_rbuf) >= count) < 0)
60		return 0;
61
62	dvb_ringbuffer_write_user(&dev->tsout_rbuf, buf, count);
63
64	return count;
65}
66
67static ssize_t ts_read(struct file *file, char __user *buf,
68		       size_t count, loff_t *ppos)
69{
70	struct dvb_device *dvbdev = file->private_data;
71	struct ngene_channel *chan = dvbdev->priv;
72	struct ngene *dev = chan->dev;
73	int left, avail;
74
75	left = count;
76	while (left) {
77		if (wait_event_interruptible(
78			    dev->tsin_rbuf.queue,
79			    dvb_ringbuffer_avail(&dev->tsin_rbuf) > 0) < 0)
80			return -EAGAIN;
81		avail = dvb_ringbuffer_avail(&dev->tsin_rbuf);
82		if (avail > left)
83			avail = left;
84		dvb_ringbuffer_read_user(&dev->tsin_rbuf, buf, avail);
85		left -= avail;
86		buf += avail;
87	}
88	return count;
89}
90
91static const struct file_operations ci_fops = {
92	.owner   = THIS_MODULE,
93	.read    = ts_read,
94	.write   = ts_write,
95	.open    = dvb_generic_open,
96	.release = dvb_generic_release,
97};
98
99struct dvb_device ngene_dvbdev_ci = {
100	.readers = -1,
101	.writers = -1,
102	.users   = -1,
103	.fops    = &ci_fops,
104};
105
106
107/****************************************************************************/
108/* DVB functions and API interface ******************************************/
109/****************************************************************************/
110
111static void swap_buffer(u32 *p, u32 len)
112{
113	while (len) {
114		*p = swab32(*p);
115		p++;
116		len -= 4;
117	}
118}
119
120/* start of filler packet */
121static u8 fill_ts[] = { 0x47, 0x1f, 0xff, 0x10, TS_FILLER };
122
123/* #define DEBUG_CI_XFER */
124#ifdef DEBUG_CI_XFER
125static u32 ok;
126static u32 overflow;
127static u32 stripped;
128#endif
129
130void *tsin_exchange(void *priv, void *buf, u32 len, u32 clock, u32 flags)
131{
132	struct ngene_channel *chan = priv;
133	struct ngene *dev = chan->dev;
134
135
136	if (flags & DF_SWAP32)
137		swap_buffer(buf, len);
138
139	if (dev->ci.en && chan->number == 2) {
140		while (len >= 188) {
141			if (memcmp(buf, fill_ts, sizeof fill_ts) != 0) {
142				if (dvb_ringbuffer_free(&dev->tsin_rbuf) >= 188) {
143					dvb_ringbuffer_write(&dev->tsin_rbuf, buf, 188);
144					wake_up(&dev->tsin_rbuf.queue);
145#ifdef DEBUG_CI_XFER
146					ok++;
147#endif
148				}
149#ifdef DEBUG_CI_XFER
150				else
151					overflow++;
152#endif
153			}
154#ifdef DEBUG_CI_XFER
155			else
156				stripped++;
157
158			if (ok % 100 == 0 && overflow)
159				printk(KERN_WARNING "%s: ok %u overflow %u dropped %u\n", __func__, ok, overflow, stripped);
160#endif
161			buf += 188;
162			len -= 188;
163		}
164		return NULL;
165	}
166
167	if (chan->users > 0)
168		dvb_dmx_swfilter(&chan->demux, buf, len);
169
170	return NULL;
171}
172
173void *tsout_exchange(void *priv, void *buf, u32 len, u32 clock, u32 flags)
174{
175	struct ngene_channel *chan = priv;
176	struct ngene *dev = chan->dev;
177	u32 alen;
178
179	alen = dvb_ringbuffer_avail(&dev->tsout_rbuf);
180	alen -= alen % 188;
181
182	if (alen < len)
183		FillTSBuffer(buf + alen, len - alen, flags);
184	else
185		alen = len;
186	dvb_ringbuffer_read(&dev->tsout_rbuf, buf, alen);
187	if (flags & DF_SWAP32)
188		swap_buffer((u32 *)buf, alen);
189	wake_up_interruptible(&dev->tsout_rbuf.queue);
190	return buf;
191}
192
193
194
195int ngene_start_feed(struct dvb_demux_feed *dvbdmxfeed)
196{
197	struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
198	struct ngene_channel *chan = dvbdmx->priv;
199
200	if (chan->users == 0) {
201		if (!chan->dev->cmd_timeout_workaround || !chan->running)
202			set_transfer(chan, 1);
203	}
204
205	return ++chan->users;
206}
207
208int ngene_stop_feed(struct dvb_demux_feed *dvbdmxfeed)
209{
210	struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
211	struct ngene_channel *chan = dvbdmx->priv;
212
213	if (--chan->users)
214		return chan->users;
215
216	if (!chan->dev->cmd_timeout_workaround)
217		set_transfer(chan, 0);
218
219	return 0;
220}
221
222int my_dvb_dmx_ts_card_init(struct dvb_demux *dvbdemux, char *id,
223			    int (*start_feed)(struct dvb_demux_feed *),
224			    int (*stop_feed)(struct dvb_demux_feed *),
225			    void *priv)
226{
227	dvbdemux->priv = priv;
228
229	dvbdemux->filternum = 256;
230	dvbdemux->feednum = 256;
231	dvbdemux->start_feed = start_feed;
232	dvbdemux->stop_feed = stop_feed;
233	dvbdemux->write_to_decoder = NULL;
234	dvbdemux->dmx.capabilities = (DMX_TS_FILTERING |
235				      DMX_SECTION_FILTERING |
236				      DMX_MEMORY_BASED_FILTERING);
237	return dvb_dmx_init(dvbdemux);
238}
239
240int my_dvb_dmxdev_ts_card_init(struct dmxdev *dmxdev,
241			       struct dvb_demux *dvbdemux,
242			       struct dmx_frontend *hw_frontend,
243			       struct dmx_frontend *mem_frontend,
244			       struct dvb_adapter *dvb_adapter)
245{
246	int ret;
247
248	dmxdev->filternum = 256;
249	dmxdev->demux = &dvbdemux->dmx;
250	dmxdev->capabilities = 0;
251	ret = dvb_dmxdev_init(dmxdev, dvb_adapter);
252	if (ret < 0)
253		return ret;
254
255	hw_frontend->source = DMX_FRONTEND_0;
256	dvbdemux->dmx.add_frontend(&dvbdemux->dmx, hw_frontend);
257	mem_frontend->source = DMX_MEMORY_FE;
258	dvbdemux->dmx.add_frontend(&dvbdemux->dmx, mem_frontend);
259	return dvbdemux->dmx.connect_frontend(&dvbdemux->dmx, hw_frontend);
260}
261