优龙2410linux2.6.8内核源代码

源代码在线查看: bttv-if.c

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				/*				    bttv-if.c  --  old gpio interface to other kernel modules				                   don't use in new code, will go away in 2.7						   have a look at bttv-gpio.c instead.								    bttv - Bt848 frame grabber driver								    Copyright (C) 1996,97,98 Ralph  Metzler (rjkm@thp.uni-koeln.de)				                           & Marcus Metzler (mocm@thp.uni-koeln.de)				    (c) 1999-2003 Gerd Knorr 								    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.								    This program is distributed in the hope that it will be useful,				    but WITHOUT ANY WARRANTY; without even the implied warranty of				    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the				    GNU General Public License for more details.								    You should have received a copy of the GNU General Public License				    along with this program; if not, write to the Free Software				    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.				    				*/								#include 				#include 				#include 				#include 								#include "bttvp.h"								EXPORT_SYMBOL(bttv_get_cardinfo);				EXPORT_SYMBOL(bttv_get_pcidev);				EXPORT_SYMBOL(bttv_get_id);				EXPORT_SYMBOL(bttv_gpio_enable);				EXPORT_SYMBOL(bttv_read_gpio);				EXPORT_SYMBOL(bttv_write_gpio);				EXPORT_SYMBOL(bttv_get_gpio_queue);				EXPORT_SYMBOL(bttv_i2c_call);								/* ----------------------------------------------------------------------- */				/* Exported functions - for other modules which want to access the         */				/*                      gpio ports (IR for example)                        */				/*                      see bttv.h for comments                            */								int bttv_get_cardinfo(unsigned int card, int *type, unsigned *cardid)				{					if (card >= bttv_num) {						return -1;					}					*type   = bttvs[card].c.type;					*cardid = bttvs[card].cardid;					return 0;				}								struct pci_dev* bttv_get_pcidev(unsigned int card)				{					if (card >= bttv_num)						return NULL;					return bttvs[card].c.pci;				}								int bttv_get_id(unsigned int card)				{					printk("bttv_get_id is obsolete, use bttv_get_cardinfo instead\n");					if (card >= bttv_num) {						return -1;					}					return bttvs[card].c.type;				}												int bttv_gpio_enable(unsigned int card, unsigned long mask, unsigned long data)				{					struct bttv *btv;									if (card >= bttv_num) {						return -EINVAL;					}										btv = &bttvs[card];					gpio_inout(mask,data);					if (bttv_gpio)						bttv_gpio_tracking(btv,"extern enable");					return 0;				}								int bttv_read_gpio(unsigned int card, unsigned long *data)				{					struct bttv *btv;										if (card >= bttv_num) {						return -EINVAL;					}									btv = &bttvs[card];									if(btv->shutdown) {						return -ENODEV;					}								/* prior setting BT848_GPIO_REG_INP is (probably) not needed 				   because we set direct input on init */					*data = gpio_read();					return 0;				}								int bttv_write_gpio(unsigned int card, unsigned long mask, unsigned long data)				{					struct bttv *btv;										if (card >= bttv_num) {						return -EINVAL;					}									btv = &bttvs[card];								/* prior setting BT848_GPIO_REG_INP is (probably) not needed 				   because direct input is set on init */					gpio_bits(mask,data);					if (bttv_gpio)						bttv_gpio_tracking(btv,"extern write");					return 0;				}								wait_queue_head_t* bttv_get_gpio_queue(unsigned int card)				{					struct bttv *btv;									if (card >= bttv_num) {						return NULL;					}									btv = &bttvs[card];					if (bttvs[card].shutdown) {						return NULL;					}					return &btv->gpioq;				}								/*				 * Local variables:				 * c-basic-offset: 8				 * End:				 */							

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