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 38 static unsigned int i2c_debug; 39 module_param(i2c_debug, int, 0644); 40 MODULE_PARM_DESC(i2c_debug,"enable debug messages [i2c]"); 41 42 static unsigned int i2c_scan; 43 module_param(i2c_scan, int, 0444); 44 MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time"); 45 46 static unsigned int i2c_udelay = 5; 47 module_param(i2c_udelay, int, 0644); 48 MODULE_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 56 static 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 68 static 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 80 static 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 89 static 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 /* ----------------------------------------------------------------------- */ 99 100 static 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 /* ----------------------------------------------------------------------- */ 110 111 static 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 }; 119 120 static 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 */ 136 int 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 core->i2c_algo = cx8800_i2c_algo_template; 143 144 145 core->i2c_adap.dev.parent = &pci->dev; 146 strlcpy(core->i2c_adap.name,core->name,sizeof(core->i2c_adap.name)); 147 core->i2c_adap.owner = THIS_MODULE; 148 core->i2c_algo.udelay = i2c_udelay; 149 core->i2c_algo.data = core; 150 i2c_set_adapdata(&core->i2c_adap, &core->v4l2_dev); 151 core->i2c_adap.algo_data = &core->i2c_algo; 152 core->i2c_client.adapter = &core->i2c_adap; 153 strlcpy(core->i2c_client.name, "cx88xx internal", I2C_NAME_SIZE); 154 155 cx8800_bit_setscl(core,1); 156 cx8800_bit_setsda(core,1); 157 158 core->i2c_rc = i2c_bit_add_bus(&core->i2c_adap); 159 if (0 == core->i2c_rc) { 160 static u8 tuner_data[] = 161 { 0x0b, 0xdc, 0x86, 0x52 }; 162 static struct i2c_msg tuner_msg = 163 { .flags = 0, .addr = 0xc2 >> 1, .buf = tuner_data, .len = 4 }; 164 165 dprintk(1, "i2c register ok\n"); 166 switch( core->boardnr ) { 167 case CX88_BOARD_HAUPPAUGE_HVR1300: 168 case CX88_BOARD_HAUPPAUGE_HVR3000: 169 case CX88_BOARD_HAUPPAUGE_HVR4000: 170 printk("%s: i2c init: enabling analog demod on HVR1300/3000/4000 tuner\n", 171 core->name); 172 i2c_transfer(core->i2c_client.adapter, &tuner_msg, 1); 173 break; 174 default: 175 break; 176 } 177 if (i2c_scan) 178 do_i2c_scan(core->name,&core->i2c_client); 179 } else 180 printk("%s: i2c register FAILED\n", core->name); 181 182 return core->i2c_rc; 183 } 184