1 /* 2 * Linux driver for digital TV devices equipped with B2C2 FlexcopII(b)/III 3 * flexcop-i2c.c - flexcop internal 2Wire bus (I2C) and dvb i2c initialization 4 * see flexcop.c for copyright information 5 */ 6 #include "flexcop.h" 7 8 #define FC_MAX_I2C_RETRIES 100000 9 10 static int flexcop_i2c_operation(struct flexcop_device *fc, 11 flexcop_ibi_value *r100) 12 { 13 int i; 14 flexcop_ibi_value r; 15 16 r100->tw_sm_c_100.working_start = 1; 17 deb_i2c("r100 before: %08x\n",r100->raw); 18 19 fc->write_ibi_reg(fc, tw_sm_c_100, ibi_zero); 20 fc->write_ibi_reg(fc, tw_sm_c_100, *r100); /* initiating i2c operation */ 21 22 for (i = 0; i < FC_MAX_I2C_RETRIES; i++) { 23 r = fc->read_ibi_reg(fc, tw_sm_c_100); 24 25 if (!r.tw_sm_c_100.no_base_addr_ack_error) { 26 if (r.tw_sm_c_100.st_done) { 27 *r100 = r; 28 deb_i2c("i2c success\n"); 29 return 0; 30 } 31 } else { 32 deb_i2c("suffering from an i2c ack_error\n"); 33 return -EREMOTEIO; 34 } 35 } 36 deb_i2c("tried %d times i2c operation, never finished or too many ack errors.\n", 37 i); 38 return -EREMOTEIO; 39 } 40 41 static int flexcop_i2c_read4(struct flexcop_i2c_adapter *i2c, 42 flexcop_ibi_value r100, u8 *buf) 43 { 44 flexcop_ibi_value r104; 45 int len = r100.tw_sm_c_100.total_bytes, 46 /* remember total_bytes is buflen-1 */ 47 ret; 48 49 /* work-around to have CableStar2 and SkyStar2 rev 2.7 work 50 * correctly: 51 * 52 * the ITD1000 is behind an i2c-gate which closes automatically 53 * after an i2c-transaction the STV0297 needs 2 consecutive reads 54 * one with no_base_addr = 0 and one with 1 55 * 56 * those two work-arounds are conflictin: we check for the card 57 * type, it is set when probing the ITD1000 */ 58 if (i2c->fc->dev_type == FC_SKY_REV27) 59 r100.tw_sm_c_100.no_base_addr_ack_error = i2c->no_base_addr; 60 61 ret = flexcop_i2c_operation(i2c->fc, &r100); 62 if (ret != 0) { 63 deb_i2c("Retrying operation\n"); 64 r100.tw_sm_c_100.no_base_addr_ack_error = i2c->no_base_addr; 65 ret = flexcop_i2c_operation(i2c->fc, &r100); 66 } 67 if (ret != 0) { 68 deb_i2c("read failed. %d\n", ret); 69 return ret; 70 } 71 72 buf[0] = r100.tw_sm_c_100.data1_reg; 73 74 if (len > 0) { 75 r104 = i2c->fc->read_ibi_reg(i2c->fc, tw_sm_c_104); 76 deb_i2c("read: r100: %08x, r104: %08x\n", r100.raw, r104.raw); 77 78 /* there is at least one more byte, otherwise we wouldn't be here */ 79 buf[1] = r104.tw_sm_c_104.data2_reg; 80 if (len > 1) buf[2] = r104.tw_sm_c_104.data3_reg; 81 if (len > 2) buf[3] = r104.tw_sm_c_104.data4_reg; 82 } 83 return 0; 84 } 85 86 static int flexcop_i2c_write4(struct flexcop_device *fc, 87 flexcop_ibi_value r100, u8 *buf) 88 { 89 flexcop_ibi_value r104; 90 int len = r100.tw_sm_c_100.total_bytes; /* remember total_bytes is buflen-1 */ 91 r104.raw = 0; 92 93 /* there is at least one byte, otherwise we wouldn't be here */ 94 r100.tw_sm_c_100.data1_reg = buf[0]; 95 r104.tw_sm_c_104.data2_reg = len > 0 ? buf[1] : 0; 96 r104.tw_sm_c_104.data3_reg = len > 1 ? buf[2] : 0; 97 r104.tw_sm_c_104.data4_reg = len > 2 ? buf[3] : 0; 98 99 deb_i2c("write: r100: %08x, r104: %08x\n", r100.raw, r104.raw); 100 101 /* write the additional i2c data before doing the actual i2c operation */ 102 fc->write_ibi_reg(fc, tw_sm_c_104, r104); 103 return flexcop_i2c_operation(fc, &r100); 104 } 105 106 int flexcop_i2c_request(struct flexcop_i2c_adapter *i2c, 107 flexcop_access_op_t op, u8 chipaddr, u8 addr, u8 *buf, u16 len) 108 { 109 int ret; 110 111 #ifdef DUMP_I2C_MESSAGES 112 int i; 113 #endif 114 115 u16 bytes_to_transfer; 116 flexcop_ibi_value r100; 117 118 deb_i2c("op = %d\n",op); 119 r100.raw = 0; 120 r100.tw_sm_c_100.chipaddr = chipaddr; 121 r100.tw_sm_c_100.twoWS_rw = op; 122 r100.tw_sm_c_100.twoWS_port_reg = i2c->port; 123 124 #ifdef DUMP_I2C_MESSAGES 125 printk(KERN_DEBUG "%d ", i2c->port); 126 if (op == FC_READ) 127 printk(KERN_CONT "rd("); 128 else 129 printk(KERN_CONT "wr("); 130 printk(KERN_CONT "%02x): %02x ", chipaddr, addr); 131 #endif 132 133 /* in that case addr is the only value -> 134 * we write it twice as baseaddr and val0 135 * BBTI is doing it like that for ISL6421 at least */ 136 if (i2c->no_base_addr && len == 0 && op == FC_WRITE) { 137 buf = &addr; 138 len = 1; 139 } 140 141 while (len != 0) { 142 bytes_to_transfer = len > 4 ? 4 : len; 143 144 r100.tw_sm_c_100.total_bytes = bytes_to_transfer - 1; 145 r100.tw_sm_c_100.baseaddr = addr; 146 147 if (op == FC_READ) 148 ret = flexcop_i2c_read4(i2c, r100, buf); 149 else 150 ret = flexcop_i2c_write4(i2c->fc, r100, buf); 151 152 #ifdef DUMP_I2C_MESSAGES 153 for (i = 0; i < bytes_to_transfer; i++) 154 printk(KERN_CONT "%02x ", buf[i]); 155 #endif 156 157 if (ret < 0) 158 return ret; 159 160 buf += bytes_to_transfer; 161 addr += bytes_to_transfer; 162 len -= bytes_to_transfer; 163 } 164 165 #ifdef DUMP_I2C_MESSAGES 166 printk(KERN_CONT "\n"); 167 #endif 168 169 return 0; 170 } 171 /* exported for PCI i2c */ 172 EXPORT_SYMBOL(flexcop_i2c_request); 173 174 /* master xfer callback for demodulator */ 175 static int flexcop_master_xfer(struct i2c_adapter *i2c_adap, 176 struct i2c_msg msgs[], int num) 177 { 178 struct flexcop_i2c_adapter *i2c = i2c_get_adapdata(i2c_adap); 179 int i, ret = 0; 180 181 /* Some drivers use 1 byte or 0 byte reads as probes, which this 182 * driver doesn't support. These probes will always fail, so this 183 * hack makes them always succeed. If one knew how, it would of 184 * course be better to actually do the read. */ 185 if (num == 1 && msgs[0].flags == I2C_M_RD && msgs[0].len <= 1) 186 return 1; 187 188 if (mutex_lock_interruptible(&i2c->fc->i2c_mutex)) 189 return -ERESTARTSYS; 190 191 for (i = 0; i < num; i++) { 192 /* reading */ 193 if (i+1 < num && (msgs[i+1].flags == I2C_M_RD)) { 194 ret = i2c->fc->i2c_request(i2c, FC_READ, msgs[i].addr, 195 msgs[i].buf[0], msgs[i+1].buf, 196 msgs[i+1].len); 197 i++; /* skip the following message */ 198 } else /* writing */ 199 ret = i2c->fc->i2c_request(i2c, FC_WRITE, msgs[i].addr, 200 msgs[i].buf[0], &msgs[i].buf[1], 201 msgs[i].len - 1); 202 if (ret < 0) { 203 deb_i2c("i2c master_xfer failed"); 204 break; 205 } 206 } 207 208 mutex_unlock(&i2c->fc->i2c_mutex); 209 210 if (ret == 0) 211 ret = num; 212 return ret; 213 } 214 215 static u32 flexcop_i2c_func(struct i2c_adapter *adapter) 216 { 217 return I2C_FUNC_I2C; 218 } 219 220 static struct i2c_algorithm flexcop_algo = { 221 .master_xfer = flexcop_master_xfer, 222 .functionality = flexcop_i2c_func, 223 }; 224 225 int flexcop_i2c_init(struct flexcop_device *fc) 226 { 227 int ret; 228 mutex_init(&fc->i2c_mutex); 229 230 fc->fc_i2c_adap[0].fc = fc; 231 fc->fc_i2c_adap[1].fc = fc; 232 fc->fc_i2c_adap[2].fc = fc; 233 fc->fc_i2c_adap[0].port = FC_I2C_PORT_DEMOD; 234 fc->fc_i2c_adap[1].port = FC_I2C_PORT_EEPROM; 235 fc->fc_i2c_adap[2].port = FC_I2C_PORT_TUNER; 236 237 strlcpy(fc->fc_i2c_adap[0].i2c_adap.name, "B2C2 FlexCop I2C to demod", 238 sizeof(fc->fc_i2c_adap[0].i2c_adap.name)); 239 strlcpy(fc->fc_i2c_adap[1].i2c_adap.name, "B2C2 FlexCop I2C to eeprom", 240 sizeof(fc->fc_i2c_adap[1].i2c_adap.name)); 241 strlcpy(fc->fc_i2c_adap[2].i2c_adap.name, "B2C2 FlexCop I2C to tuner", 242 sizeof(fc->fc_i2c_adap[2].i2c_adap.name)); 243 244 i2c_set_adapdata(&fc->fc_i2c_adap[0].i2c_adap, &fc->fc_i2c_adap[0]); 245 i2c_set_adapdata(&fc->fc_i2c_adap[1].i2c_adap, &fc->fc_i2c_adap[1]); 246 i2c_set_adapdata(&fc->fc_i2c_adap[2].i2c_adap, &fc->fc_i2c_adap[2]); 247 248 fc->fc_i2c_adap[0].i2c_adap.algo = 249 fc->fc_i2c_adap[1].i2c_adap.algo = 250 fc->fc_i2c_adap[2].i2c_adap.algo = &flexcop_algo; 251 fc->fc_i2c_adap[0].i2c_adap.algo_data = 252 fc->fc_i2c_adap[1].i2c_adap.algo_data = 253 fc->fc_i2c_adap[2].i2c_adap.algo_data = NULL; 254 fc->fc_i2c_adap[0].i2c_adap.dev.parent = 255 fc->fc_i2c_adap[1].i2c_adap.dev.parent = 256 fc->fc_i2c_adap[2].i2c_adap.dev.parent = fc->dev; 257 258 ret = i2c_add_adapter(&fc->fc_i2c_adap[0].i2c_adap); 259 if (ret < 0) 260 return ret; 261 262 ret = i2c_add_adapter(&fc->fc_i2c_adap[1].i2c_adap); 263 if (ret < 0) 264 goto adap_1_failed; 265 266 ret = i2c_add_adapter(&fc->fc_i2c_adap[2].i2c_adap); 267 if (ret < 0) 268 goto adap_2_failed; 269 270 fc->init_state |= FC_STATE_I2C_INIT; 271 return 0; 272 273 adap_2_failed: 274 i2c_del_adapter(&fc->fc_i2c_adap[1].i2c_adap); 275 adap_1_failed: 276 i2c_del_adapter(&fc->fc_i2c_adap[0].i2c_adap); 277 return ret; 278 } 279 280 void flexcop_i2c_exit(struct flexcop_device *fc) 281 { 282 if (fc->init_state & FC_STATE_I2C_INIT) { 283 i2c_del_adapter(&fc->fc_i2c_adap[2].i2c_adap); 284 i2c_del_adapter(&fc->fc_i2c_adap[1].i2c_adap); 285 i2c_del_adapter(&fc->fc_i2c_adap[0].i2c_adap); 286 } 287 fc->init_state &= ~FC_STATE_I2C_INIT; 288 } 289