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linux/drivers/media/dvb/firewire/firedtv.h
Stefan Richter 3fb80ef3bc V4L/DVB: firedtv: do not DMA-map stack addresses 
This is a portability fix and reduces stack usage.

The DMA mapping API cannot map on-stack addresses, as explained in
Documentation/DMA-mapping.txt.  Convert the two cases of on-stack packet
payload buffers in firedtv (payload of write requests in avc_write and
of lock requests in cmp_lock) to slab-allocated memory.

We use the 512 bytes sized FCP frame buffer in struct firedtv for this
purpose.  Previously it held only incoming FCP responses, now it holds
pending FCP requests and is then overwriten by an FCP response from the
tuner subunit.  Ditto for CMP lock requests and responses.  Accesses to
the payload buffer are serialized by fdtv->avc_mutex.

As a welcome side effect, stack usage of the AV/C transaction functions
is reduced by 512 bytes.

Alas, avc_register_remote_control() is a special case:  It previously
did not wait for a response.  To fit better in with the other FCP
transactions, let it wait for an interim response.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-02-26 15:10:48 -03:00

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/*
* FireDTV driver (formerly known as FireSAT)
*
* Copyright (C) 2004 Andreas Monitzer <andy@monitzer.com>
* Copyright (C) 2008 Henrik Kurelid <henrik@kurelid.se>
*
* 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, or (at your option) any later version.
*/
#ifndef _FIREDTV_H
#define _FIREDTV_H
#include <linux/dvb/dmx.h>
#include <linux/dvb/frontend.h>
#include <linux/list.h>
#include <linux/mod_devicetable.h>
#include <linux/mutex.h>
#include <linux/spinlock_types.h>
#include <linux/types.h>
#include <linux/wait.h>
#include <linux/workqueue.h>
#include <demux.h>
#include <dmxdev.h>
#include <dvb_demux.h>
#include <dvb_frontend.h>
#include <dvb_net.h>
#include <dvbdev.h>
struct firedtv_tuner_status {
unsigned active_system:8;
unsigned searching:1;
unsigned moving:1;
unsigned no_rf:1;
unsigned input:1;
unsigned selected_antenna:7;
unsigned ber:32;
unsigned signal_strength:8;
unsigned raster_frequency:2;
unsigned rf_frequency:22;
unsigned man_dep_info_length:8;
unsigned front_end_error:1;
unsigned antenna_error:1;
unsigned front_end_power_status:1;
unsigned power_supply:1;
unsigned carrier_noise_ratio:16;
unsigned power_supply_voltage:8;
unsigned antenna_voltage:8;
unsigned firewire_bus_voltage:8;
unsigned ca_mmi:1;
unsigned ca_pmt_reply:1;
unsigned ca_date_time_request:1;
unsigned ca_application_info:1;
unsigned ca_module_present_status:1;
unsigned ca_dvb_flag:1;
unsigned ca_error_flag:1;
unsigned ca_initialization_status:1;
};
enum model_type {
FIREDTV_UNKNOWN = 0,
FIREDTV_DVB_S = 1,
FIREDTV_DVB_C = 2,
FIREDTV_DVB_T = 3,
FIREDTV_DVB_S2 = 4,
};
struct device;
struct input_dev;
struct firedtv;
struct firedtv_backend {
int (*lock)(struct firedtv *fdtv, u64 addr, void *data);
int (*read)(struct firedtv *fdtv, u64 addr, void *data);
int (*write)(struct firedtv *fdtv, u64 addr, void *data, size_t len);
int (*start_iso)(struct firedtv *fdtv);
void (*stop_iso)(struct firedtv *fdtv);
};
struct firedtv {
struct device *device;
struct list_head list;
struct dvb_adapter adapter;
struct dmxdev dmxdev;
struct dvb_demux demux;
struct dmx_frontend frontend;
struct dvb_net dvbnet;
struct dvb_frontend fe;
struct dvb_device *cadev;
int ca_last_command;
int ca_time_interval;
struct mutex avc_mutex;
wait_queue_head_t avc_wait;
bool avc_reply_received;
struct work_struct remote_ctrl_work;
struct input_dev *remote_ctrl_dev;
enum model_type type;
char subunit;
char isochannel;
fe_sec_voltage_t voltage;
fe_sec_tone_mode_t tone;
const struct firedtv_backend *backend;
void *backend_data;
struct mutex demux_mutex;
unsigned long channel_active;
u16 channel_pid[16];
int avc_data_length;
u8 avc_data[512];
};
/* firedtv-1394.c */
#ifdef CONFIG_DVB_FIREDTV_IEEE1394
int fdtv_1394_init(void);
void fdtv_1394_exit(void);
#else
static inline int fdtv_1394_init(void) { return 0; }
static inline void fdtv_1394_exit(void) {}
#endif
/* firedtv-avc.c */
int avc_recv(struct firedtv *fdtv, void *data, size_t length);
int avc_tuner_status(struct firedtv *fdtv, struct firedtv_tuner_status *stat);
struct dvb_frontend_parameters;
int avc_tuner_dsd(struct firedtv *fdtv, struct dvb_frontend_parameters *params);
int avc_tuner_set_pids(struct firedtv *fdtv, unsigned char pidc, u16 pid[]);
int avc_tuner_get_ts(struct firedtv *fdtv);
int avc_identify_subunit(struct firedtv *fdtv);
struct dvb_diseqc_master_cmd;
int avc_lnb_control(struct firedtv *fdtv, char voltage, char burst,
char conttone, char nrdiseq,
struct dvb_diseqc_master_cmd *diseqcmd);
void avc_remote_ctrl_work(struct work_struct *work);
int avc_register_remote_control(struct firedtv *fdtv);
int avc_ca_app_info(struct firedtv *fdtv, char *app_info, unsigned int *len);
int avc_ca_info(struct firedtv *fdtv, char *app_info, unsigned int *len);
int avc_ca_reset(struct firedtv *fdtv);
int avc_ca_pmt(struct firedtv *fdtv, char *app_info, int length);
int avc_ca_get_time_date(struct firedtv *fdtv, int *interval);
int avc_ca_enter_menu(struct firedtv *fdtv);
int avc_ca_get_mmi(struct firedtv *fdtv, char *mmi_object, unsigned int *len);
int cmp_establish_pp_connection(struct firedtv *fdtv, int plug, int channel);
void cmp_break_pp_connection(struct firedtv *fdtv, int plug, int channel);
/* firedtv-ci.c */
int fdtv_ca_register(struct firedtv *fdtv);
void fdtv_ca_release(struct firedtv *fdtv);
/* firedtv-dvb.c */
int fdtv_start_feed(struct dvb_demux_feed *dvbdmxfeed);
int fdtv_stop_feed(struct dvb_demux_feed *dvbdmxfeed);
int fdtv_dvb_register(struct firedtv *fdtv);
void fdtv_dvb_unregister(struct firedtv *fdtv);
struct firedtv *fdtv_alloc(struct device *dev,
const struct firedtv_backend *backend,
const char *name, size_t name_len);
extern const char *fdtv_model_names[];
extern const struct ieee1394_device_id fdtv_id_table[];
/* firedtv-fe.c */
void fdtv_frontend_init(struct firedtv *fdtv);
/* firedtv-fw.c */
#ifdef CONFIG_DVB_FIREDTV_FIREWIRE
int fdtv_fw_init(void);
void fdtv_fw_exit(void);
#else
static inline int fdtv_fw_init(void) { return 0; }
static inline void fdtv_fw_exit(void) {}
#endif
/* firedtv-rc.c */
#ifdef CONFIG_DVB_FIREDTV_INPUT
int fdtv_register_rc(struct firedtv *fdtv, struct device *dev);
void fdtv_unregister_rc(struct firedtv *fdtv);
void fdtv_handle_rc(struct firedtv *fdtv, unsigned int code);
#else
static inline int fdtv_register_rc(struct firedtv *fdtv,
struct device *dev) { return 0; }
static inline void fdtv_unregister_rc(struct firedtv *fdtv) {}
static inline void fdtv_handle_rc(struct firedtv *fdtv, unsigned int code) {}
#endif
#endif /* _FIREDTV_H */
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