133 lines
3.5 KiB
C
133 lines
3.5 KiB
C
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/*
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zr36120_i2c.c - Zoran 36120/36125 based framegrabbers
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Copyright (C) 1998-1999 Pauline Middelink <middelin@polyware.nl>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/types.h>
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#include <linux/delay.h>
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#include <asm/io.h>
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#include <linux/video_decoder.h>
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#include <asm/uaccess.h>
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#include "tuner.h"
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#include "zr36120.h"
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/* ----------------------------------------------------------------------- */
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/* I2C functions */
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/* ----------------------------------------------------------------------- */
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/* software I2C functions */
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#define I2C_DELAY 10
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static void i2c_setlines(struct i2c_bus *bus,int ctrl,int data)
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{
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struct zoran *ztv = (struct zoran*)bus->data;
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unsigned int b = 0;
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if (data) b |= ztv->card->swapi2c ? ZORAN_I2C_SCL : ZORAN_I2C_SDA;
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if (ctrl) b |= ztv->card->swapi2c ? ZORAN_I2C_SDA : ZORAN_I2C_SCL;
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zrwrite(b, ZORAN_I2C);
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udelay(I2C_DELAY);
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}
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static int i2c_getdataline(struct i2c_bus *bus)
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{
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struct zoran *ztv = (struct zoran*)bus->data;
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if (ztv->card->swapi2c)
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return zrread(ZORAN_I2C) & ZORAN_I2C_SCL;
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return zrread(ZORAN_I2C) & ZORAN_I2C_SDA;
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}
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static
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void attach_inform(struct i2c_bus *bus, int id)
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{
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struct zoran *ztv = (struct zoran*)bus->data;
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struct video_decoder_capability dc;
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int rv;
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switch (id) {
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case I2C_DRIVERID_VIDEODECODER:
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DEBUG(printk(CARD_INFO "decoder attached\n",CARD));
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/* fetch the capabilites of the decoder */
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rv = i2c_control_device(&ztv->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_GET_CAPABILITIES, &dc);
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if (rv) {
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DEBUG(printk(CARD_DEBUG "decoder is not V4L aware!\n",CARD));
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break;
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}
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DEBUG(printk(CARD_DEBUG "capabilities %d %d %d\n",CARD,dc.flags,dc.inputs,dc.outputs));
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/* Test if the decoder can de VBI transfers */
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if (dc.flags & 16 /*VIDEO_DECODER_VBI*/)
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ztv->have_decoder = 2;
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else
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ztv->have_decoder = 1;
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break;
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case I2C_DRIVERID_TUNER:
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ztv->have_tuner = 1;
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DEBUG(printk(CARD_INFO "tuner attached\n",CARD));
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if (ztv->tuner_type >= 0)
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{
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if (i2c_control_device(&ztv->i2c,I2C_DRIVERID_TUNER,TUNER_SET_TYPE,&ztv->tuner_type)<0)
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DEBUG(printk(CARD_INFO "attach_inform; tuner won't be set to type %d\n",CARD,ztv->tuner_type));
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}
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break;
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default:
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DEBUG(printk(CARD_INFO "attach_inform; unknown device id=%d\n",CARD,id));
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break;
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}
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}
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static
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void detach_inform(struct i2c_bus *bus, int id)
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{
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struct zoran *ztv = (struct zoran*)bus->data;
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switch (id) {
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case I2C_DRIVERID_VIDEODECODER:
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ztv->have_decoder = 0;
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DEBUG(printk(CARD_INFO "decoder detached\n",CARD));
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break;
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case I2C_DRIVERID_TUNER:
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ztv->have_tuner = 0;
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DEBUG(printk(CARD_INFO "tuner detached\n",CARD));
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break;
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default:
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DEBUG(printk(CARD_INFO "detach_inform; unknown device id=%d\n",CARD,id));
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break;
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}
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}
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struct i2c_bus zoran_i2c_bus_template =
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{
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"ZR36120",
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I2C_BUSID_ZORAN,
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NULL,
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SPIN_LOCK_UNLOCKED,
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attach_inform,
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detach_inform,
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i2c_setlines,
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i2c_getdataline,
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NULL,
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NULL
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};
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