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authorNooneImportant <nxhxzi702@sneakemail.com>2005-11-08 21:35:27 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-09 07:56:03 -0800
commit83b75b049be981e579ba2cb88aa9bf3534bbbdb1 (patch)
treec7d6199e9c6b5373b373439148da7dc4f48a0698 /drivers/media/dvb/dvb-core
parentb90ed914e513a6ad6184f7a46a0df0888dcfc177 (diff)
[PATCH] dvb: let other frontends support FE_DISHNETWORK_SEND_LEGACY_CMD
Add support to FE_DISHNETWORK_SEND_LEGACY_CMD code to support other frontends besides stv0299. The generic code is a fallback in the case that it doesn't work for some specific frontends (again stv0299 being a good example). Signed-off-by: NooneImportant <nxhxzi702@sneakemail.com> Signed-off-by: Johannes Stezenbach <js@linuxtv.org> Signed-off-by: Michael Krufky <mkrufky@linuxtv.org> Cc: Johannes Stezenbach <js@linuxtv.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/media/dvb/dvb-core')
-rw-r--r--drivers/media/dvb/dvb-core/dvb_frontend.c97
-rw-r--r--drivers/media/dvb/dvb-core/dvb_frontend.h3
2 files changed, 100 insertions, 0 deletions
diff --git a/drivers/media/dvb/dvb-core/dvb_frontend.c b/drivers/media/dvb/dvb-core/dvb_frontend.c
index a8bc84240b5..e36dbd9c4cc 100644
--- a/drivers/media/dvb/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb/dvb-core/dvb_frontend.c
@@ -577,6 +577,49 @@ static void dvb_frontend_stop(struct dvb_frontend *fe)
fepriv->thread_pid);
}
+s32 timeval_usec_diff(struct timeval lasttime, struct timeval curtime)
+{
+ return ((curtime.tv_usec < lasttime.tv_usec) ?
+ 1000000 - lasttime.tv_usec + curtime.tv_usec :
+ curtime.tv_usec - lasttime.tv_usec);
+}
+EXPORT_SYMBOL(timeval_usec_diff);
+
+static inline void timeval_usec_add(struct timeval *curtime, u32 add_usec)
+{
+ curtime->tv_usec += add_usec;
+ if (curtime->tv_usec >= 1000000) {
+ curtime->tv_usec -= 1000000;
+ curtime->tv_sec++;
+ }
+}
+
+/*
+ * Sleep until gettimeofday() > waketime + add_usec
+ * This needs to be as precise as possible, but as the delay is
+ * usually between 2ms and 32ms, it is done using a scheduled msleep
+ * followed by usleep (normally a busy-wait loop) for the remainder
+ */
+void dvb_frontend_sleep_until(struct timeval *waketime, u32 add_usec)
+{
+ struct timeval lasttime;
+ s32 delta, newdelta;
+
+ timeval_usec_add(waketime, add_usec);
+
+ do_gettimeofday(&lasttime);
+ delta = timeval_usec_diff(lasttime, *waketime);
+ if (delta > 2500) {
+ msleep((delta - 1500) / 1000);
+ do_gettimeofday(&lasttime);
+ newdelta = timeval_usec_diff(lasttime, *waketime);
+ delta = (newdelta > delta) ? 0 : newdelta;
+ }
+ if (delta > 0)
+ udelay(delta);
+}
+EXPORT_SYMBOL(dvb_frontend_sleep_until);
+
static int dvb_frontend_start(struct dvb_frontend *fe)
{
int ret;
@@ -728,6 +771,60 @@ static int dvb_frontend_ioctl(struct inode *inode, struct file *file,
err = fe->ops->dishnetwork_send_legacy_command(fe, (unsigned int) parg);
fepriv->state = FESTATE_DISEQC;
fepriv->status = 0;
+ } else if (fe->ops->set_voltage) {
+ /*
+ * NOTE: This is a fallback condition. Some frontends
+ * (stv0299 for instance) take longer than 8msec to
+ * respond to a set_voltage command. Those switches
+ * need custom routines to switch properly. For all
+ * other frontends, the following shoule work ok.
+ * Dish network legacy switches (as used by Dish500)
+ * are controlled by sending 9-bit command words
+ * spaced 8msec apart.
+ * the actual command word is switch/port dependant
+ * so it is up to the userspace application to send
+ * the right command.
+ * The command must always start with a '0' after
+ * initialization, so parg is 8 bits and does not
+ * include the initialization or start bit
+ */
+ unsigned int cmd = ((unsigned int) parg) << 1;
+ struct timeval nexttime;
+ struct timeval tv[10];
+ int i;
+ u8 last = 1;
+ if (dvb_frontend_debug)
+ printk("%s switch command: 0x%04x\n", __FUNCTION__, cmd);
+ do_gettimeofday(&nexttime);
+ if (dvb_frontend_debug)
+ memcpy(&tv[0], &nexttime, sizeof(struct timeval));
+ /* before sending a command, initialize by sending
+ * a 32ms 18V to the switch
+ */
+ fe->ops->set_voltage(fe, SEC_VOLTAGE_18);
+ dvb_frontend_sleep_until(&nexttime, 32000);
+
+ for (i = 0; i < 9; i++) {
+ if (dvb_frontend_debug)
+ do_gettimeofday(&tv[i + 1]);
+ if ((cmd & 0x01) != last) {
+ /* set voltage to (last ? 13V : 18V) */
+ fe->ops->set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
+ last = (last) ? 0 : 1;
+ }
+ cmd = cmd >> 1;
+ if (i != 8)
+ dvb_frontend_sleep_until(&nexttime, 8000);
+ }
+ if (dvb_frontend_debug) {
+ printk("%s(%d): switch delay (should be 32k followed by all 8k\n",
+ __FUNCTION__, fe->dvb->num);
+ for (i = 1; i < 10; i++)
+ printk("%d: %d\n", i, timeval_usec_diff(tv[i-1] , tv[i]));
+ }
+ err = 0;
+ fepriv->state = FESTATE_DISEQC;
+ fepriv->status = 0;
}
break;
diff --git a/drivers/media/dvb/dvb-core/dvb_frontend.h b/drivers/media/dvb/dvb-core/dvb_frontend.h
index 9c2c1d1136b..348c9b0b988 100644
--- a/drivers/media/dvb/dvb-core/dvb_frontend.h
+++ b/drivers/media/dvb/dvb-core/dvb_frontend.h
@@ -101,4 +101,7 @@ extern int dvb_register_frontend(struct dvb_adapter* dvb,
extern int dvb_unregister_frontend(struct dvb_frontend* fe);
+extern void dvb_frontend_sleep_until(struct timeval *waketime, u32 add_usec);
+extern s32 timeval_usec_diff(struct timeval lasttime, struct timeval curtime);
+
#endif