1
  2/*
  3
  4    cx88-i2c.c  --  all the i2c code is here
  5
  6    Copyright (C) 1996,97,98 Ralph  Metzler (rjkm@thp.uni-koeln.de)
  7			   & Marcus Metzler (mocm@thp.uni-koeln.de)
  8    (c) 2002 Yurij Sysoev <yurij@naturesoft.net>
  9    (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
 10
 11    (c) 2005 Mauro Carvalho Chehab <mchehab@infradead.org>
 12	- Multituner support and i2c address binding
 13
 14    This program is free software; you can redistribute it and/or modify
 15    it under the terms of the GNU General Public License as published by
 16    the Free Software Foundation; either version 2 of the License, or
 17    (at your option) any later version.
 18
 19    This program is distributed in the hope that it will be useful,
 20    but WITHOUT ANY WARRANTY; without even the implied warranty of
 21    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 22    GNU General Public License for more details.
 23
 24    You should have received a copy of the GNU General Public License
 25    along with this program; if not, write to the Free Software
 26    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 27
 28*/
 29
 30#include <linux/module.h>
 31#include <linux/init.h>
 32
 33#include <asm/io.h>
 34
 35#include "cx88.h"
 36#include <media/v4l2-common.h>
 37
 38static unsigned int i2c_debug;
 39module_param(i2c_debug, int, 0644);
 40MODULE_PARM_DESC(i2c_debug,"enable debug messages [i2c]");
 41
 42static unsigned int i2c_scan;
 43module_param(i2c_scan, int, 0444);
 44MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
 45
 46static unsigned int i2c_udelay = 5;
 47module_param(i2c_udelay, int, 0644);
 48MODULE_PARM_DESC(i2c_udelay,"i2c delay at insmod time, in usecs "
 49		"(should be 5 or higher). Lower value means higher bus speed.");
 50
 51#define dprintk(level,fmt, arg...)	if (i2c_debug >= level) \
 52	printk(KERN_DEBUG "%s: " fmt, core->name , ## arg)
 53
 54/* ----------------------------------------------------------------------- */
 55
 56static void cx8800_bit_setscl(void *data, int state)
 57{
 58	struct cx88_core *core = data;
 59
 60	if (state)
 61		core->i2c_state |= 0x02;
 62	else
 63		core->i2c_state &= ~0x02;
 64	cx_write(MO_I2C, core->i2c_state);
 65	cx_read(MO_I2C);
 66}
 67
 68static void cx8800_bit_setsda(void *data, int state)
 69{
 70	struct cx88_core *core = data;
 71
 72	if (state)
 73		core->i2c_state |= 0x01;
 74	else
 75		core->i2c_state &= ~0x01;
 76	cx_write(MO_I2C, core->i2c_state);
 77	cx_read(MO_I2C);
 78}
 79
 80static int cx8800_bit_getscl(void *data)
 81{
 82	struct cx88_core *core = data;
 83	u32 state;
 84
 85	state = cx_read(MO_I2C);
 86	return state & 0x02 ? 1 : 0;
 87}
 88
 89static int cx8800_bit_getsda(void *data)
 90{
 91	struct cx88_core *core = data;
 92	u32 state;
 93
 94	state = cx_read(MO_I2C);
 95	return state & 0x01;
 96}
 97
 98/* ----------------------------------------------------------------------- */
 99
100static const struct i2c_algo_bit_data cx8800_i2c_algo_template = {
101	.setsda  = cx8800_bit_setsda,
102	.setscl  = cx8800_bit_setscl,
103	.getsda  = cx8800_bit_getsda,
104	.getscl  = cx8800_bit_getscl,
105	.udelay  = 16,
106	.timeout = 200,
107};
108
109/* ----------------------------------------------------------------------- */
110
111static const char * const i2c_devs[128] = {
112	[ 0x1c >> 1 ] = "lgdt330x",
113	[ 0x86 >> 1 ] = "tda9887/cx22702",
114	[ 0xa0 >> 1 ] = "eeprom",
115	[ 0xc0 >> 1 ] = "tuner (analog)",
116	[ 0xc2 >> 1 ] = "tuner (analog/dvb)",
117	[ 0xc8 >> 1 ] = "xc5000",
118};
119
120static void do_i2c_scan(const char *name, struct i2c_client *c)
121{
122	unsigned char buf;
123	int i,rc;
124
125	for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
126		c->addr = i;
127		rc = i2c_master_recv(c,&buf,0);
128		if (rc < 0)
129			continue;
130		printk("%s: i2c scan: found device @ 0x%x  [%s]\n",
131		       name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
132	}
133}
134
135/* init + register i2c adapter */
136int cx88_i2c_init(struct cx88_core *core, struct pci_dev *pci)
137{
138	/* Prevents usage of invalid delay values */
139	if (i2c_udelay<5)
140		i2c_udelay=5;
141
142	memcpy(&core->i2c_algo, &cx8800_i2c_algo_template,
143	       sizeof(core->i2c_algo));
144
145
146	core->i2c_adap.dev.parent = &pci->dev;
147	strlcpy(core->i2c_adap.name,core->name,sizeof(core->i2c_adap.name));
148	core->i2c_adap.owner = THIS_MODULE;
149	core->i2c_algo.udelay = i2c_udelay;
150	core->i2c_algo.data = core;
151	i2c_set_adapdata(&core->i2c_adap, &core->v4l2_dev);
152	core->i2c_adap.algo_data = &core->i2c_algo;
153	core->i2c_client.adapter = &core->i2c_adap;
154	strlcpy(core->i2c_client.name, "cx88xx internal", I2C_NAME_SIZE);
155
156	cx8800_bit_setscl(core,1);
157	cx8800_bit_setsda(core,1);
158
159	core->i2c_rc = i2c_bit_add_bus(&core->i2c_adap);
160	if (0 == core->i2c_rc) {
161		static u8 tuner_data[] =
162			{ 0x0b, 0xdc, 0x86, 0x52 };
163		static struct i2c_msg tuner_msg =
164			{ .flags = 0, .addr = 0xc2 >> 1, .buf = tuner_data, .len = 4 };
165
166		dprintk(1, "i2c register ok\n");
167		switch( core->boardnr ) {
168			case CX88_BOARD_HAUPPAUGE_HVR1300:
169			case CX88_BOARD_HAUPPAUGE_HVR3000:
170			case CX88_BOARD_HAUPPAUGE_HVR4000:
171				printk("%s: i2c init: enabling analog demod on HVR1300/3000/4000 tuner\n",
172					core->name);
173				i2c_transfer(core->i2c_client.adapter, &tuner_msg, 1);
174				break;
175			default:
176				break;
177		}
178		if (i2c_scan)
179			do_i2c_scan(core->name,&core->i2c_client);
180	} else
181		printk("%s: i2c register FAILED\n", core->name);
182
183	return core->i2c_rc;
184}