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Viewing changes to drivers/media/video/cx88/cx88-i2c.c

  • Committer: Package Import Robot
  • Author(s): Alessio Igor Bogani
  • Date: 2011-10-26 11:13:05 UTC
  • Revision ID: package-import@ubuntu.com-20111026111305-tz023xykf0i6eosh
Tags: upstream-3.2.0
Import upstream version 3.2.0

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drivers/media/video/cx88/cx88-i2c.c
 
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/*
 
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    cx88-i2c.c  --  all the i2c code is here
 
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    Copyright (C) 1996,97,98 Ralph  Metzler (rjkm@thp.uni-koeln.de)
 
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                           & Marcus Metzler (mocm@thp.uni-koeln.de)
 
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    (c) 2002 Yurij Sysoev <yurij@naturesoft.net>
 
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    (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
 
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    (c) 2005 Mauro Carvalho Chehab <mchehab@infradead.org>
 
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        - Multituner support and i2c address binding
 
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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/module.h>
 
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#include <linux/init.h>
 
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#include <asm/io.h>
 
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#include "cx88.h"
 
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#include <media/v4l2-common.h>
 
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static unsigned int i2c_debug;
 
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module_param(i2c_debug, int, 0644);
 
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MODULE_PARM_DESC(i2c_debug,"enable debug messages [i2c]");
 
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static unsigned int i2c_scan;
 
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module_param(i2c_scan, int, 0444);
 
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MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
 
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static unsigned int i2c_udelay = 5;
 
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module_param(i2c_udelay, int, 0644);
 
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MODULE_PARM_DESC(i2c_udelay,"i2c delay at insmod time, in usecs "
 
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                "(should be 5 or higher). Lower value means higher bus speed.");
 
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#define dprintk(level,fmt, arg...)      if (i2c_debug >= level) \
 
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        printk(KERN_DEBUG "%s: " fmt, core->name , ## arg)
 
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/* ----------------------------------------------------------------------- */
 
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static void cx8800_bit_setscl(void *data, int state)
 
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{
 
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        struct cx88_core *core = data;
 
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        if (state)
 
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                core->i2c_state |= 0x02;
 
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        else
 
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                core->i2c_state &= ~0x02;
 
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        cx_write(MO_I2C, core->i2c_state);
 
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        cx_read(MO_I2C);
 
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}
 
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static void cx8800_bit_setsda(void *data, int state)
 
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{
 
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        struct cx88_core *core = data;
 
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        if (state)
 
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                core->i2c_state |= 0x01;
 
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        else
 
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                core->i2c_state &= ~0x01;
 
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        cx_write(MO_I2C, core->i2c_state);
 
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        cx_read(MO_I2C);
 
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}
 
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static int cx8800_bit_getscl(void *data)
 
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{
 
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        struct cx88_core *core = data;
 
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        u32 state;
 
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        state = cx_read(MO_I2C);
 
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        return state & 0x02 ? 1 : 0;
 
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}
 
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static int cx8800_bit_getsda(void *data)
 
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{
 
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        struct cx88_core *core = data;
 
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        u32 state;
 
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        state = cx_read(MO_I2C);
 
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        return state & 0x01;
 
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}
 
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/* ----------------------------------------------------------------------- */
 
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static const struct i2c_algo_bit_data cx8800_i2c_algo_template = {
 
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        .setsda  = cx8800_bit_setsda,
 
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        .setscl  = cx8800_bit_setscl,
 
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        .getsda  = cx8800_bit_getsda,
 
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        .getscl  = cx8800_bit_getscl,
 
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        .udelay  = 16,
 
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        .timeout = 200,
 
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};
 
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/* ----------------------------------------------------------------------- */
 
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static const char * const i2c_devs[128] = {
 
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        [ 0x1c >> 1 ] = "lgdt330x",
 
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        [ 0x86 >> 1 ] = "tda9887/cx22702",
 
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        [ 0xa0 >> 1 ] = "eeprom",
 
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        [ 0xc0 >> 1 ] = "tuner (analog)",
 
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        [ 0xc2 >> 1 ] = "tuner (analog/dvb)",
 
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        [ 0xc8 >> 1 ] = "xc5000",
 
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};
 
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static void do_i2c_scan(const char *name, struct i2c_client *c)
 
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{
 
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        unsigned char buf;
 
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        int i,rc;
 
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        for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
 
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                c->addr = i;
 
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                rc = i2c_master_recv(c,&buf,0);
 
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                if (rc < 0)
 
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                        continue;
 
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                printk("%s: i2c scan: found device @ 0x%x  [%s]\n",
 
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                       name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
 
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        }
 
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}
 
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/* init + register i2c algo-bit adapter */
 
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int cx88_i2c_init(struct cx88_core *core, struct pci_dev *pci)
 
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{
 
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        /* Prevents usage of invalid delay values */
 
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        if (i2c_udelay<5)
 
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                i2c_udelay=5;
 
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        memcpy(&core->i2c_algo, &cx8800_i2c_algo_template,
 
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               sizeof(core->i2c_algo));
 
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        core->i2c_adap.dev.parent = &pci->dev;
 
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        strlcpy(core->i2c_adap.name,core->name,sizeof(core->i2c_adap.name));
 
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        core->i2c_adap.owner = THIS_MODULE;
 
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        core->i2c_algo.udelay = i2c_udelay;
 
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        core->i2c_algo.data = core;
 
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        i2c_set_adapdata(&core->i2c_adap, &core->v4l2_dev);
 
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        core->i2c_adap.algo_data = &core->i2c_algo;
 
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        core->i2c_client.adapter = &core->i2c_adap;
 
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        strlcpy(core->i2c_client.name, "cx88xx internal", I2C_NAME_SIZE);
 
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        cx8800_bit_setscl(core,1);
 
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        cx8800_bit_setsda(core,1);
 
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        core->i2c_rc = i2c_bit_add_bus(&core->i2c_adap);
 
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        if (0 == core->i2c_rc) {
 
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                static u8 tuner_data[] =
 
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                        { 0x0b, 0xdc, 0x86, 0x52 };
 
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                static struct i2c_msg tuner_msg =
 
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                        { .flags = 0, .addr = 0xc2 >> 1, .buf = tuner_data, .len = 4 };
 
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166
                dprintk(1, "i2c register ok\n");
 
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                switch( core->boardnr ) {
 
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                        case CX88_BOARD_HAUPPAUGE_HVR1300:
 
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                        case CX88_BOARD_HAUPPAUGE_HVR3000:
 
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                        case CX88_BOARD_HAUPPAUGE_HVR4000:
 
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                                printk("%s: i2c init: enabling analog demod on HVR1300/3000/4000 tuner\n",
 
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                                        core->name);
 
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                                i2c_transfer(core->i2c_client.adapter, &tuner_msg, 1);
 
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                                break;
 
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                        default:
 
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                                break;
 
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                }
 
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                if (i2c_scan)
 
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                        do_i2c_scan(core->name,&core->i2c_client);
 
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        } else
 
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                printk("%s: i2c register FAILED\n", core->name);
 
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        return core->i2c_rc;
 
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}