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 * 12 * (c) 2005 Mauro Carvalho Chehab <mchehab@kernel.org> 13 * - Multituner support and i2c address binding 14 */ 15 16 #include "cx88.h" 17 18 #include <linux/init.h> 19 #include <linux/io.h> 20 #include <linux/module.h> 21 22 #include <media/v4l2-common.h> 23 24 static unsigned int i2c_debug; 25 module_param(i2c_debug, int, 0644); 26 MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]"); 27 28 static unsigned int i2c_scan; 29 module_param(i2c_scan, int, 0444); 30 MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time"); 31 32 static unsigned int i2c_udelay = 5; 33 module_param(i2c_udelay, int, 0644); 34 MODULE_PARM_DESC(i2c_udelay, 35 "i2c delay at insmod time, in usecs (should be 5 or higher). Lower value means higher bus speed."); 36 37 #define dprintk(level, fmt, arg...) do { \ 38 if (i2c_debug >= level) \ 39 printk(KERN_DEBUG pr_fmt("%s: i2c:" fmt), \ 40 __func__, ##arg); \ 41 } while (0) 42 43 /* ----------------------------------------------------------------------- */ 44 45 static void cx8800_bit_setscl(void *data, int state) 46 { 47 struct cx88_core *core = data; 48 49 if (state) 50 core->i2c_state |= 0x02; 51 else 52 core->i2c_state &= ~0x02; 53 cx_write(MO_I2C, core->i2c_state); 54 cx_read(MO_I2C); 55 } 56 57 static void cx8800_bit_setsda(void *data, int state) 58 { 59 struct cx88_core *core = data; 60 61 if (state) 62 core->i2c_state |= 0x01; 63 else 64 core->i2c_state &= ~0x01; 65 cx_write(MO_I2C, core->i2c_state); 66 cx_read(MO_I2C); 67 } 68 69 static int cx8800_bit_getscl(void *data) 70 { 71 struct cx88_core *core = data; 72 u32 state; 73 74 state = cx_read(MO_I2C); 75 return state & 0x02 ? 1 : 0; 76 } 77 78 static int cx8800_bit_getsda(void *data) 79 { 80 struct cx88_core *core = data; 81 u32 state; 82 83 state = cx_read(MO_I2C); 84 return state & 0x01; 85 } 86 87 /* ----------------------------------------------------------------------- */ 88 89 static const struct i2c_algo_bit_data cx8800_i2c_algo_template = { 90 .setsda = cx8800_bit_setsda, 91 .setscl = cx8800_bit_setscl, 92 .getsda = cx8800_bit_getsda, 93 .getscl = cx8800_bit_getscl, 94 .udelay = 16, 95 .timeout = 200, 96 }; 97 98 /* ----------------------------------------------------------------------- */ 99 100 static const char * const i2c_devs[128] = { 101 [0x1c >> 1] = "lgdt330x", 102 [0x86 >> 1] = "tda9887/cx22702", 103 [0xa0 >> 1] = "eeprom", 104 [0xc0 >> 1] = "tuner (analog)", 105 [0xc2 >> 1] = "tuner (analog/dvb)", 106 [0xc8 >> 1] = "xc5000", 107 }; 108 109 static void do_i2c_scan(const char *name, struct i2c_client *c) 110 { 111 unsigned char buf; 112 int i, rc; 113 114 for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) { 115 c->addr = i; 116 rc = i2c_master_recv(c, &buf, 0); 117 if (rc < 0) 118 continue; 119 pr_info("i2c scan: found device @ 0x%x [%s]\n", 120 i << 1, i2c_devs[i] ? i2c_devs[i] : "???"); 121 } 122 } 123 124 /* init + register i2c adapter */ 125 int cx88_i2c_init(struct cx88_core *core, struct pci_dev *pci) 126 { 127 /* Prevents usage of invalid delay values */ 128 if (i2c_udelay < 5) 129 i2c_udelay = 5; 130 131 core->i2c_algo = cx8800_i2c_algo_template; 132 133 core->i2c_adap.dev.parent = &pci->dev; 134 strscpy(core->i2c_adap.name, core->name, sizeof(core->i2c_adap.name)); 135 core->i2c_adap.owner = THIS_MODULE; 136 core->i2c_algo.udelay = i2c_udelay; 137 core->i2c_algo.data = core; 138 i2c_set_adapdata(&core->i2c_adap, &core->v4l2_dev); 139 core->i2c_adap.algo_data = &core->i2c_algo; 140 core->i2c_client.adapter = &core->i2c_adap; 141 strscpy(core->i2c_client.name, "cx88xx internal", I2C_NAME_SIZE); 142 143 cx8800_bit_setscl(core, 1); 144 cx8800_bit_setsda(core, 1); 145 146 core->i2c_rc = i2c_bit_add_bus(&core->i2c_adap); 147 if (core->i2c_rc == 0) { 148 static u8 tuner_data[] = { 149 0x0b, 0xdc, 0x86, 0x52 }; 150 static struct i2c_msg tuner_msg = { 151 .flags = 0, 152 .addr = 0xc2 >> 1, 153 .buf = tuner_data, 154 .len = 4 155 }; 156 157 dprintk(1, "i2c register ok\n"); 158 switch (core->boardnr) { 159 case CX88_BOARD_HAUPPAUGE_HVR1300: 160 case CX88_BOARD_HAUPPAUGE_HVR3000: 161 case CX88_BOARD_HAUPPAUGE_HVR4000: 162 pr_info("i2c init: enabling analog demod on HVR1300/3000/4000 tuner\n"); 163 i2c_transfer(core->i2c_client.adapter, &tuner_msg, 1); 164 break; 165 default: 166 break; 167 } 168 if (i2c_scan) 169 do_i2c_scan(core->name, &core->i2c_client); 170 } else 171 pr_err("i2c register FAILED\n"); 172 173 return core->i2c_rc; 174 } 175