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 (should be 5 or higher). Lower value means higher bus speed."); 49 50 #define dprintk(level,fmt, arg...) if (i2c_debug >= level) \ 51 printk(KERN_DEBUG "%s: " fmt, core->name , ## arg) 52 53 /* ----------------------------------------------------------------------- */ 54 55 static void cx8800_bit_setscl(void *data, int state) 56 { 57 struct cx88_core *core = data; 58 59 if (state) 60 core->i2c_state |= 0x02; 61 else 62 core->i2c_state &= ~0x02; 63 cx_write(MO_I2C, core->i2c_state); 64 cx_read(MO_I2C); 65 } 66 67 static void cx8800_bit_setsda(void *data, int state) 68 { 69 struct cx88_core *core = data; 70 71 if (state) 72 core->i2c_state |= 0x01; 73 else 74 core->i2c_state &= ~0x01; 75 cx_write(MO_I2C, core->i2c_state); 76 cx_read(MO_I2C); 77 } 78 79 static int cx8800_bit_getscl(void *data) 80 { 81 struct cx88_core *core = data; 82 u32 state; 83 84 state = cx_read(MO_I2C); 85 return state & 0x02 ? 1 : 0; 86 } 87 88 static int cx8800_bit_getsda(void *data) 89 { 90 struct cx88_core *core = data; 91 u32 state; 92 93 state = cx_read(MO_I2C); 94 return state & 0x01; 95 } 96 97 /* ----------------------------------------------------------------------- */ 98 99 static const struct i2c_algo_bit_data cx8800_i2c_algo_template = { 100 .setsda = cx8800_bit_setsda, 101 .setscl = cx8800_bit_setscl, 102 .getsda = cx8800_bit_getsda, 103 .getscl = cx8800_bit_getscl, 104 .udelay = 16, 105 .timeout = 200, 106 }; 107 108 /* ----------------------------------------------------------------------- */ 109 110 static const char * const i2c_devs[128] = { 111 [ 0x1c >> 1 ] = "lgdt330x", 112 [ 0x86 >> 1 ] = "tda9887/cx22702", 113 [ 0xa0 >> 1 ] = "eeprom", 114 [ 0xc0 >> 1 ] = "tuner (analog)", 115 [ 0xc2 >> 1 ] = "tuner (analog/dvb)", 116 [ 0xc8 >> 1 ] = "xc5000", 117 }; 118 119 static void do_i2c_scan(const char *name, struct i2c_client *c) 120 { 121 unsigned char buf; 122 int i,rc; 123 124 for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) { 125 c->addr = i; 126 rc = i2c_master_recv(c,&buf,0); 127 if (rc < 0) 128 continue; 129 printk("%s: i2c scan: found device @ 0x%x [%s]\n", 130 name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???"); 131 } 132 } 133 134 /* init + register i2c adapter */ 135 int cx88_i2c_init(struct cx88_core *core, struct pci_dev *pci) 136 { 137 /* Prevents usage of invalid delay values */ 138 if (i2c_udelay<5) 139 i2c_udelay=5; 140 141 core->i2c_algo = cx8800_i2c_algo_template; 142 143 144 core->i2c_adap.dev.parent = &pci->dev; 145 strlcpy(core->i2c_adap.name,core->name,sizeof(core->i2c_adap.name)); 146 core->i2c_adap.owner = THIS_MODULE; 147 core->i2c_algo.udelay = i2c_udelay; 148 core->i2c_algo.data = core; 149 i2c_set_adapdata(&core->i2c_adap, &core->v4l2_dev); 150 core->i2c_adap.algo_data = &core->i2c_algo; 151 core->i2c_client.adapter = &core->i2c_adap; 152 strlcpy(core->i2c_client.name, "cx88xx internal", I2C_NAME_SIZE); 153 154 cx8800_bit_setscl(core,1); 155 cx8800_bit_setsda(core,1); 156 157 core->i2c_rc = i2c_bit_add_bus(&core->i2c_adap); 158 if (0 == core->i2c_rc) { 159 static u8 tuner_data[] = 160 { 0x0b, 0xdc, 0x86, 0x52 }; 161 static struct i2c_msg tuner_msg = 162 { .flags = 0, .addr = 0xc2 >> 1, .buf = tuner_data, .len = 4 }; 163 164 dprintk(1, "i2c register ok\n"); 165 switch( core->boardnr ) { 166 case CX88_BOARD_HAUPPAUGE_HVR1300: 167 case CX88_BOARD_HAUPPAUGE_HVR3000: 168 case CX88_BOARD_HAUPPAUGE_HVR4000: 169 printk("%s: i2c init: enabling analog demod on HVR1300/3000/4000 tuner\n", 170 core->name); 171 i2c_transfer(core->i2c_client.adapter, &tuner_msg, 1); 172 break; 173 default: 174 break; 175 } 176 if (i2c_scan) 177 do_i2c_scan(core->name,&core->i2c_client); 178 } else 179 printk("%s: i2c register FAILED\n", core->name); 180 181 return core->i2c_rc; 182 } 183