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@kernel.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 25 #include "cx88.h" 26 27 #include <linux/init.h> 28 #include <linux/io.h> 29 #include <linux/module.h> 30 31 #include <media/v4l2-common.h> 32 33 static unsigned int i2c_debug; 34 module_param(i2c_debug, int, 0644); 35 MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]"); 36 37 static unsigned int i2c_scan; 38 module_param(i2c_scan, int, 0444); 39 MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time"); 40 41 static unsigned int i2c_udelay = 5; 42 module_param(i2c_udelay, int, 0644); 43 MODULE_PARM_DESC(i2c_udelay, 44 "i2c delay at insmod time, in usecs (should be 5 or higher). Lower value means higher bus speed."); 45 46 #define dprintk(level, fmt, arg...) do { \ 47 if (i2c_debug >= level) \ 48 printk(KERN_DEBUG pr_fmt("%s: i2c:" fmt), \ 49 __func__, ##arg); \ 50 } while (0) 51 52 /* ----------------------------------------------------------------------- */ 53 54 static void cx8800_bit_setscl(void *data, int state) 55 { 56 struct cx88_core *core = data; 57 58 if (state) 59 core->i2c_state |= 0x02; 60 else 61 core->i2c_state &= ~0x02; 62 cx_write(MO_I2C, core->i2c_state); 63 cx_read(MO_I2C); 64 } 65 66 static void cx8800_bit_setsda(void *data, int state) 67 { 68 struct cx88_core *core = data; 69 70 if (state) 71 core->i2c_state |= 0x01; 72 else 73 core->i2c_state &= ~0x01; 74 cx_write(MO_I2C, core->i2c_state); 75 cx_read(MO_I2C); 76 } 77 78 static int cx8800_bit_getscl(void *data) 79 { 80 struct cx88_core *core = data; 81 u32 state; 82 83 state = cx_read(MO_I2C); 84 return state & 0x02 ? 1 : 0; 85 } 86 87 static int cx8800_bit_getsda(void *data) 88 { 89 struct cx88_core *core = data; 90 u32 state; 91 92 state = cx_read(MO_I2C); 93 return state & 0x01; 94 } 95 96 /* ----------------------------------------------------------------------- */ 97 98 static const struct i2c_algo_bit_data cx8800_i2c_algo_template = { 99 .setsda = cx8800_bit_setsda, 100 .setscl = cx8800_bit_setscl, 101 .getsda = cx8800_bit_getsda, 102 .getscl = cx8800_bit_getscl, 103 .udelay = 16, 104 .timeout = 200, 105 }; 106 107 /* ----------------------------------------------------------------------- */ 108 109 static const char * const i2c_devs[128] = { 110 [0x1c >> 1] = "lgdt330x", 111 [0x86 >> 1] = "tda9887/cx22702", 112 [0xa0 >> 1] = "eeprom", 113 [0xc0 >> 1] = "tuner (analog)", 114 [0xc2 >> 1] = "tuner (analog/dvb)", 115 [0xc8 >> 1] = "xc5000", 116 }; 117 118 static void do_i2c_scan(const char *name, struct i2c_client *c) 119 { 120 unsigned char buf; 121 int i, rc; 122 123 for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) { 124 c->addr = i; 125 rc = i2c_master_recv(c, &buf, 0); 126 if (rc < 0) 127 continue; 128 pr_info("i2c scan: found device @ 0x%x [%s]\n", 129 i << 1, i2c_devs[i] ? i2c_devs[i] : "???"); 130 } 131 } 132 133 /* init + register i2c adapter */ 134 int cx88_i2c_init(struct cx88_core *core, struct pci_dev *pci) 135 { 136 /* Prevents usage of invalid delay values */ 137 if (i2c_udelay < 5) 138 i2c_udelay = 5; 139 140 core->i2c_algo = cx8800_i2c_algo_template; 141 142 core->i2c_adap.dev.parent = &pci->dev; 143 strscpy(core->i2c_adap.name, core->name, sizeof(core->i2c_adap.name)); 144 core->i2c_adap.owner = THIS_MODULE; 145 core->i2c_algo.udelay = i2c_udelay; 146 core->i2c_algo.data = core; 147 i2c_set_adapdata(&core->i2c_adap, &core->v4l2_dev); 148 core->i2c_adap.algo_data = &core->i2c_algo; 149 core->i2c_client.adapter = &core->i2c_adap; 150 strscpy(core->i2c_client.name, "cx88xx internal", I2C_NAME_SIZE); 151 152 cx8800_bit_setscl(core, 1); 153 cx8800_bit_setsda(core, 1); 154 155 core->i2c_rc = i2c_bit_add_bus(&core->i2c_adap); 156 if (core->i2c_rc == 0) { 157 static u8 tuner_data[] = { 158 0x0b, 0xdc, 0x86, 0x52 }; 159 static struct i2c_msg tuner_msg = { 160 .flags = 0, 161 .addr = 0xc2 >> 1, 162 .buf = tuner_data, 163 .len = 4 164 }; 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 pr_info("i2c init: enabling analog demod on HVR1300/3000/4000 tuner\n"); 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 pr_err("i2c register FAILED\n"); 181 182 return core->i2c_rc; 183 } 184