diff options
Diffstat (limited to 'drivers/media/video/zr36120_i2c.c')
| -rw-r--r-- | drivers/media/video/zr36120_i2c.c | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/drivers/media/video/zr36120_i2c.c b/drivers/media/video/zr36120_i2c.c new file mode 100644 index 00000000000..6bfe84d657f --- /dev/null +++ b/drivers/media/video/zr36120_i2c.c @@ -0,0 +1,132 @@ +/* + zr36120_i2c.c - Zoran 36120/36125 based framegrabbers + + Copyright (C) 1998-1999 Pauline Middelink <middelin@polyware.nl> + + 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 <linux/types.h> +#include <linux/delay.h> +#include <asm/io.h> + +#include <linux/video_decoder.h> +#include <asm/uaccess.h> + +#include "tuner.h" +#include "zr36120.h" + +/* ----------------------------------------------------------------------- */ +/* I2C functions */ +/* ----------------------------------------------------------------------- */ + +/* software I2C functions */ + +#define I2C_DELAY 10 + +static void i2c_setlines(struct i2c_bus *bus,int ctrl,int data) +{ + struct zoran *ztv = (struct zoran*)bus->data; + unsigned int b = 0; + if (data) b |= ztv->card->swapi2c ? ZORAN_I2C_SCL : ZORAN_I2C_SDA; + if (ctrl) b |= ztv->card->swapi2c ? ZORAN_I2C_SDA : ZORAN_I2C_SCL; + zrwrite(b, ZORAN_I2C); + udelay(I2C_DELAY); +} + +static int i2c_getdataline(struct i2c_bus *bus) +{ + struct zoran *ztv = (struct zoran*)bus->data; + if (ztv->card->swapi2c) + return zrread(ZORAN_I2C) & ZORAN_I2C_SCL; + return zrread(ZORAN_I2C) & ZORAN_I2C_SDA; +} + +static +void attach_inform(struct i2c_bus *bus, int id) +{ + struct zoran *ztv = (struct zoran*)bus->data; + struct video_decoder_capability dc; + int rv; + + switch (id) { + case I2C_DRIVERID_VIDEODECODER: + DEBUG(printk(CARD_INFO "decoder attached\n",CARD)); + + /* fetch the capabilites of the decoder */ + rv = i2c_control_device(&ztv->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_GET_CAPABILITIES, &dc); + if (rv) { + DEBUG(printk(CARD_DEBUG "decoder is not V4L aware!\n",CARD)); + break; + } + DEBUG(printk(CARD_DEBUG "capabilities %d %d %d\n",CARD,dc.flags,dc.inputs,dc.outputs)); + + /* Test if the decoder can de VBI transfers */ + if (dc.flags & 16 /*VIDEO_DECODER_VBI*/) + ztv->have_decoder = 2; + else + ztv->have_decoder = 1; + break; + case I2C_DRIVERID_TUNER: + ztv->have_tuner = 1; + DEBUG(printk(CARD_INFO "tuner attached\n",CARD)); + if (ztv->tuner_type >= 0) + { + if (i2c_control_device(&ztv->i2c,I2C_DRIVERID_TUNER,TUNER_SET_TYPE,&ztv->tuner_type)<0) + DEBUG(printk(CARD_INFO "attach_inform; tuner won't be set to type %d\n",CARD,ztv->tuner_type)); + } + break; + default: + DEBUG(printk(CARD_INFO "attach_inform; unknown device id=%d\n",CARD,id)); + break; + } +} + +static +void detach_inform(struct i2c_bus *bus, int id) +{ + struct zoran *ztv = (struct zoran*)bus->data; + + switch (id) { + case I2C_DRIVERID_VIDEODECODER: + ztv->have_decoder = 0; + DEBUG(printk(CARD_INFO "decoder detached\n",CARD)); + break; + case I2C_DRIVERID_TUNER: + ztv->have_tuner = 0; + DEBUG(printk(CARD_INFO "tuner detached\n",CARD)); + break; + default: + DEBUG(printk(CARD_INFO "detach_inform; unknown device id=%d\n",CARD,id)); + break; + } +} + +struct i2c_bus zoran_i2c_bus_template = +{ + "ZR36120", + I2C_BUSID_ZORAN, + NULL, + + SPIN_LOCK_UNLOCKED, + + attach_inform, + detach_inform, + + i2c_setlines, + i2c_getdataline, + NULL, + NULL +}; |