From be431b16c6bd22020abc5f5f30a89f1e2934de8e Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Mon, 18 Mar 2013 15:25:36 -0300 Subject: [PATCH] [media] dvb-frontend: split set_delivery_system() This function is complex, and has different workflows, one for DVBv3 calls, and another one for DVBv5 calls. Break it into 3 functions, in order to make easier to understand what each block does. No functional changes so far. A few comments got improved. Signed-off-by: Mauro Carvalho Chehab --- drivers/media/dvb-core/dvb_frontend.c | 294 +++++++++++++++----------- 1 file changed, 165 insertions(+), 129 deletions(-) diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c index 6e50a7581568..d0d193d1404a 100644 --- a/drivers/media/dvb-core/dvb_frontend.c +++ b/drivers/media/dvb-core/dvb_frontend.c @@ -1509,132 +1509,12 @@ static bool is_dvbv3_delsys(u32 delsys) return status; } -static int set_delivery_system(struct dvb_frontend *fe, u32 desired_system) +static int emulate_delivery_system(struct dvb_frontend *fe, + enum dvbv3_emulation_type type, + u32 delsys, u32 desired_system) { - int ncaps, i; - u32 delsys = SYS_UNDEFINED; + int i; struct dtv_frontend_properties *c = &fe->dtv_property_cache; - enum dvbv3_emulation_type type; - - /* - * It was reported that some old DVBv5 applications were - * filling delivery_system with SYS_UNDEFINED. If this happens, - * assume that the application wants to use the first supported - * delivery system. - */ - if (c->delivery_system == SYS_UNDEFINED) - c->delivery_system = fe->ops.delsys[0]; - - if (desired_system == SYS_UNDEFINED) { - /* - * A DVBv3 call doesn't know what's the desired system. - * Also, DVBv3 applications don't know that ops.info->type - * could be changed, and they simply dies when it doesn't - * match. - * So, don't change the current delivery system, as it - * may be trying to do the wrong thing, like setting an - * ISDB-T frontend as DVB-T. Instead, find the closest - * DVBv3 system that matches the delivery system. - */ - if (is_dvbv3_delsys(c->delivery_system)) { - dev_dbg(fe->dvb->device, - "%s: Using delivery system to %d\n", - __func__, c->delivery_system); - return 0; - } - type = dvbv3_type(c->delivery_system); - switch (type) { - case DVBV3_QPSK: - desired_system = SYS_DVBS; - break; - case DVBV3_QAM: - desired_system = SYS_DVBC_ANNEX_A; - break; - case DVBV3_ATSC: - desired_system = SYS_ATSC; - break; - case DVBV3_OFDM: - desired_system = SYS_DVBT; - break; - default: - dev_dbg(fe->dvb->device, "%s: This frontend doesn't support DVBv3 calls\n", - __func__); - return -EINVAL; - } - /* - * Get a delivery system that is compatible with DVBv3 - * NOTE: in order for this to work with softwares like Kaffeine that - * uses a DVBv5 call for DVB-S2 and a DVBv3 call to go back to - * DVB-S, drivers that support both should put the SYS_DVBS entry - * before the SYS_DVBS2, otherwise it won't switch back to DVB-S. - * The real fix is that userspace applications should not use DVBv3 - * and not trust on calling FE_SET_FRONTEND to switch the delivery - * system. - */ - ncaps = 0; - while (fe->ops.delsys[ncaps] && ncaps < MAX_DELSYS) { - if (fe->ops.delsys[ncaps] == desired_system) { - delsys = desired_system; - break; - } - ncaps++; - } - if (delsys == SYS_UNDEFINED) { - dev_dbg(fe->dvb->device, "%s: Couldn't find a delivery system that matches %d\n", - __func__, desired_system); - } - } else { - /* - * This is a DVBv5 call. So, it likely knows the supported - * delivery systems. - */ - - /* Check if the desired delivery system is supported */ - ncaps = 0; - while (fe->ops.delsys[ncaps] && ncaps < MAX_DELSYS) { - if (fe->ops.delsys[ncaps] == desired_system) { - c->delivery_system = desired_system; - dev_dbg(fe->dvb->device, - "%s: Changing delivery system to %d\n", - __func__, desired_system); - return 0; - } - ncaps++; - } - type = dvbv3_type(desired_system); - - /* - * The delivery system is not supported. See if it can be - * emulated. - * The emulation only works if the desired system is one of the - * DVBv3 delivery systems - */ - if (!is_dvbv3_delsys(desired_system)) { - dev_dbg(fe->dvb->device, - "%s: can't use a DVBv3 FE_SET_FRONTEND call on this frontend\n", - __func__); - return -EINVAL; - } - - /* - * Get the last non-DVBv3 delivery system that has the same type - * of the desired system - */ - ncaps = 0; - while (fe->ops.delsys[ncaps] && ncaps < MAX_DELSYS) { - if ((dvbv3_type(fe->ops.delsys[ncaps]) == type) && - !is_dvbv3_delsys(fe->ops.delsys[ncaps])) - delsys = fe->ops.delsys[ncaps]; - ncaps++; - } - /* There's nothing compatible with the desired delivery system */ - if (delsys == SYS_UNDEFINED) { - dev_dbg(fe->dvb->device, - "%s: Incompatible DVBv3 FE_SET_FRONTEND call for this frontend\n", - __func__); - return -EINVAL; - } - } c->delivery_system = delsys; @@ -1648,8 +1528,8 @@ static int set_delivery_system(struct dvb_frontend *fe, u32 desired_system) * delivery system is the last one at the ops.delsys[] array */ dev_dbg(fe->dvb->device, - "%s: Using delivery system %d emulated as if it were a %d\n", - __func__, delsys, desired_system); + "%s: Using delivery system %d emulated as if it were a %d\n", + __func__, delsys, desired_system); /* * For now, handles ISDB-T calls. More code may be needed here for the @@ -1684,6 +1564,162 @@ static int set_delivery_system(struct dvb_frontend *fe, u32 desired_system) return 0; } +static int dvbv5_set_delivery_system(struct dvb_frontend *fe, + u32 desired_system) +{ + int ncaps; + u32 delsys = SYS_UNDEFINED; + struct dtv_frontend_properties *c = &fe->dtv_property_cache; + enum dvbv3_emulation_type type; + + /* + * It was reported that some old DVBv5 applications were + * filling delivery_system with SYS_UNDEFINED. If this happens, + * assume that the application wants to use the first supported + * delivery system. + */ + if (c->delivery_system == SYS_UNDEFINED) + c->delivery_system = fe->ops.delsys[0]; + + /* + * This is a DVBv5 call. So, it likely knows the supported + * delivery systems. + */ + + /* Check if the desired delivery system is supported */ + ncaps = 0; + while (fe->ops.delsys[ncaps] && ncaps < MAX_DELSYS) { + if (fe->ops.delsys[ncaps] == desired_system) { + c->delivery_system = desired_system; + dev_dbg(fe->dvb->device, + "%s: Changing delivery system to %d\n", + __func__, desired_system); + return 0; + } + ncaps++; + } + + /* + * Need to emulate a delivery system + */ + + type = dvbv3_type(desired_system); + + /* + * The delivery system is not supported. See if it can be + * emulated. + * The emulation only works if the desired system is one of the + * DVBv3 delivery systems + */ + if (!is_dvbv3_delsys(desired_system)) { + dev_dbg(fe->dvb->device, + "%s: can't use a DVBv3 FE_SET_FRONTEND call for this frontend\n", + __func__); + return -EINVAL; + } + + /* + * Get the last non-DVBv3 delivery system that has the same type + * of the desired system + */ + ncaps = 0; + while (fe->ops.delsys[ncaps] && ncaps < MAX_DELSYS) { + if ((dvbv3_type(fe->ops.delsys[ncaps]) == type) && + !is_dvbv3_delsys(fe->ops.delsys[ncaps])) + delsys = fe->ops.delsys[ncaps]; + ncaps++; + } + /* There's nothing compatible with the desired delivery system */ + if (delsys == SYS_UNDEFINED) { + dev_dbg(fe->dvb->device, + "%s: Incompatible DVBv3 FE_SET_FRONTEND call for this frontend\n", + __func__); + return -EINVAL; + } + + return emulate_delivery_system(fe, type, delsys, desired_system); +} + +static int dvbv3_set_delivery_system(struct dvb_frontend *fe) +{ + int ncaps; + u32 desired_system; + u32 delsys = SYS_UNDEFINED; + struct dtv_frontend_properties *c = &fe->dtv_property_cache; + enum dvbv3_emulation_type type; + + /* If not set yet, defaults to the first supported delivery system */ + if (c->delivery_system == SYS_UNDEFINED) + c->delivery_system = fe->ops.delsys[0]; + + /* + * A DVBv3 call doesn't know what's the desired system. + * Also, DVBv3 applications don't know that ops.info->type + * could be changed, and they simply don't tune when it doesn't + * match. + * So, don't change the current delivery system, as it + * may be trying to do the wrong thing, like setting an + * ISDB-T frontend as DVB-T. Instead, find the closest + * DVBv3 system that matches the delivery system. + */ + + /* + * Trivial case: just use the current one, if it already a DVBv3 + * delivery system + */ + if (is_dvbv3_delsys(c->delivery_system)) { + dev_dbg(fe->dvb->device, + "%s: Using delivery system to %d\n", + __func__, c->delivery_system); + return 0; + } + + /* Convert from DVBv3 into DVBv5 namespace */ + type = dvbv3_type(c->delivery_system); + switch (type) { + case DVBV3_QPSK: + desired_system = SYS_DVBS; + break; + case DVBV3_QAM: + desired_system = SYS_DVBC_ANNEX_A; + break; + case DVBV3_ATSC: + desired_system = SYS_ATSC; + break; + case DVBV3_OFDM: + desired_system = SYS_DVBT; + break; + default: + dev_dbg(fe->dvb->device, "%s: This frontend doesn't support DVBv3 calls\n", + __func__); + return -EINVAL; + } + + /* + * Get a delivery system that is compatible with DVBv3 + * NOTE: in order for this to work with softwares like Kaffeine that + * uses a DVBv5 call for DVB-S2 and a DVBv3 call to go back to + * DVB-S, drivers that support both should put the SYS_DVBS entry + * before the SYS_DVBS2, otherwise it won't switch back to DVB-S. + * The real fix is that userspace applications should not use DVBv3 + * and not trust on calling FE_SET_FRONTEND to switch the delivery + * system. + */ + ncaps = 0; + while (fe->ops.delsys[ncaps] && ncaps < MAX_DELSYS) { + if (fe->ops.delsys[ncaps] == desired_system) { + delsys = desired_system; + break; + } + ncaps++; + } + if (delsys == SYS_UNDEFINED) { + dev_dbg(fe->dvb->device, "%s: Couldn't find a delivery system that matches %d\n", + __func__, desired_system); + } + return emulate_delivery_system(fe, type, delsys, desired_system); +} + static int dtv_property_process_set(struct dvb_frontend *fe, struct dtv_property *tvp, struct file *file) @@ -1742,7 +1778,7 @@ static int dtv_property_process_set(struct dvb_frontend *fe, c->rolloff = tvp->u.data; break; case DTV_DELIVERY_SYSTEM: - r = set_delivery_system(fe, tvp->u.data); + r = dvbv5_set_delivery_system(fe, tvp->u.data); break; case DTV_VOLTAGE: c->voltage = tvp->u.data; @@ -2335,7 +2371,7 @@ static int dvb_frontend_ioctl_legacy(struct file *file, break; case FE_SET_FRONTEND: - err = set_delivery_system(fe, SYS_UNDEFINED); + err = dvbv3_set_delivery_system(fe); if (err) break; @@ -2594,7 +2630,7 @@ int dvb_register_frontend(struct dvb_adapter* dvb, * first supported delivery system (ops->delsys[0]) */ - fe->dtv_property_cache.delivery_system = fe->ops.delsys[0]; + fe->dtv_property_cache.delivery_system = fe->ops.delsys[0]; dvb_frontend_clear_cache(fe); mutex_unlock(&frontend_mutex);