1 // SPDX-License-Identifier: GPL-2.0-or-later 2 3 /* 4 * 5 * cx88-i2c.c -- all the i2c code is here 6 * 7 * Copyright (C) 1996,97,98 Ralph Metzler (rjkm@thp.uni-koeln.de) 8 * & Marcus Metzler (mocm@thp.uni-koeln.de) 9 * (c) 2002 Yurij Sysoev <yurij@naturesoft.net> 10 * (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org> 11 * (c) 2005 Mauro Carvalho Chehab <mchehab@kernel.org> 12 * - Multituner support and i2c address binding 13 */ 14 15 #include "cx88.h" 16 17 #include <linux/init.h> 18 #include <linux/io.h> 19 #include <linux/module.h> 20 21 #include <media/v4l2-common.h> 22 23 static unsigned int i2c_debug; 24 module_param(i2c_debug, int, 0644); 25 MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]"); 26 27 static unsigned int i2c_scan; 28 module_param(i2c_scan, int, 0444); 29 MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time"); 30 31 static unsigned int i2c_udelay = 5; 32 module_param(i2c_udelay, int, 0644); 33 MODULE_PARM_DESC(i2c_udelay, 34 "i2c delay at insmod time, in usecs (should be 5 or higher). Lower value means higher bus speed."); 35 36 #define dprintk(level, fmt, arg...) do { \ 37 if (i2c_debug >= level) \ 38 printk(KERN_DEBUG pr_fmt("%s: i2c:" fmt), \ 39 __func__, ##arg); \ 40 } while (0) 41 42 /* ----------------------------------------------------------------------- */ 43 44 static void cx8800_bit_setscl(void *data, int state) 45 { 46 struct cx88_core *core = data; 47 48 if (state) 49 core->i2c_state |= 0x02; 50 else 51 core->i2c_state &= ~0x02; 52 cx_write(MO_I2C, core->i2c_state); 53 cx_read(MO_I2C); 54 } 55 56 static void cx8800_bit_setsda(void *data, int state) 57 { 58 struct cx88_core *core = data; 59 60 if (state) 61 core->i2c_state |= 0x01; 62 else 63 core->i2c_state &= ~0x01; 64 cx_write(MO_I2C, core->i2c_state); 65 cx_read(MO_I2C); 66 } 67 68 static int cx8800_bit_getscl(void *data) 69 { 70 struct cx88_core *core = data; 71 u32 state; 72 73 state = cx_read(MO_I2C); 74 return state & 0x02 ? 1 : 0; 75 } 76 77 static int cx8800_bit_getsda(void *data) 78 { 79 struct cx88_core *core = data; 80 u32 state; 81 82 state = cx_read(MO_I2C); 83 return state & 0x01; 84 } 85 86 /* ----------------------------------------------------------------------- */ 87 88 static const struct i2c_algo_bit_data cx8800_i2c_algo_template = { 89 .setsda = cx8800_bit_setsda, 90 .setscl = cx8800_bit_setscl, 91 .getsda = cx8800_bit_getsda, 92 .getscl = cx8800_bit_getscl, 93 .udelay = 16, 94 .timeout = 200, 95 }; 96 97 /* ----------------------------------------------------------------------- */ 98 99 static const char * const i2c_devs[128] = { 100 [0x1c >> 1] = "lgdt330x", 101 [0x86 >> 1] = "tda9887/cx22702", 102 [0xa0 >> 1] = "eeprom", 103 [0xc0 >> 1] = "tuner (analog)", 104 [0xc2 >> 1] = "tuner (analog/dvb)", 105 [0xc8 >> 1] = "xc5000", 106 }; 107 108 static void do_i2c_scan(const char *name, struct i2c_client *c) 109 { 110 unsigned char buf; 111 int i, rc; 112 113 for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) { 114 c->addr = i; 115 rc = i2c_master_recv(c, &buf, 0); 116 if (rc < 0) 117 continue; 118 pr_info("i2c scan: found device @ 0x%x [%s]\n", 119 i << 1, i2c_devs[i] ? i2c_devs[i] : "???"); 120 } 121 } 122 123 /* init + register i2c adapter */ 124 int cx88_i2c_init(struct cx88_core *core, struct pci_dev *pci) 125 { 126 /* Prevents usage of invalid delay values */ 127 if (i2c_udelay < 5) 128 i2c_udelay = 5; 129 130 core->i2c_algo = cx8800_i2c_algo_template; 131 132 core->i2c_adap.dev.parent = &pci->dev; 133 strscpy(core->i2c_adap.name, core->name, sizeof(core->i2c_adap.name)); 134 core->i2c_adap.owner = THIS_MODULE; 135 core->i2c_algo.udelay = i2c_udelay; 136 core->i2c_algo.data = core; 137 i2c_set_adapdata(&core->i2c_adap, &core->v4l2_dev); 138 core->i2c_adap.algo_data = &core->i2c_algo; 139 core->i2c_client.adapter = &core->i2c_adap; 140 strscpy(core->i2c_client.name, "cx88xx internal", I2C_NAME_SIZE); 141 142 cx8800_bit_setscl(core, 1); 143 cx8800_bit_setsda(core, 1); 144 145 core->i2c_rc = i2c_bit_add_bus(&core->i2c_adap); 146 if (core->i2c_rc == 0) { 147 static u8 tuner_data[] = { 148 0x0b, 0xdc, 0x86, 0x52 }; 149 static struct i2c_msg tuner_msg = { 150 .flags = 0, 151 .addr = 0xc2 >> 1, 152 .buf = tuner_data, 153 .len = 4 154 }; 155 156 dprintk(1, "i2c register ok\n"); 157 switch (core->boardnr) { 158 case CX88_BOARD_HAUPPAUGE_HVR1300: 159 case CX88_BOARD_HAUPPAUGE_HVR3000: 160 case CX88_BOARD_HAUPPAUGE_HVR4000: 161 pr_info("i2c init: enabling analog demod on HVR1300/3000/4000 tuner\n"); 162 i2c_transfer(core->i2c_client.adapter, &tuner_msg, 1); 163 break; 164 default: 165 break; 166 } 167 if (i2c_scan) 168 do_i2c_scan(core->name, &core->i2c_client); 169 } else 170 pr_err("i2c register FAILED\n"); 171 172 return core->i2c_rc; 173 } 174