13785bc17SMauro Carvalho Chehab /* 23785bc17SMauro Carvalho Chehab * Linux driver for digital TV devices equipped with B2C2 FlexcopII(b)/III 33785bc17SMauro Carvalho Chehab * flexcop-i2c.c - flexcop internal 2Wire bus (I2C) and dvb i2c initialization 43785bc17SMauro Carvalho Chehab * see flexcop.c for copyright information 53785bc17SMauro Carvalho Chehab */ 63785bc17SMauro Carvalho Chehab #include "flexcop.h" 73785bc17SMauro Carvalho Chehab 83785bc17SMauro Carvalho Chehab #define FC_MAX_I2C_RETRIES 100000 93785bc17SMauro Carvalho Chehab 103785bc17SMauro Carvalho Chehab static int flexcop_i2c_operation(struct flexcop_device *fc, 113785bc17SMauro Carvalho Chehab flexcop_ibi_value *r100) 123785bc17SMauro Carvalho Chehab { 133785bc17SMauro Carvalho Chehab int i; 143785bc17SMauro Carvalho Chehab flexcop_ibi_value r; 153785bc17SMauro Carvalho Chehab 163785bc17SMauro Carvalho Chehab r100->tw_sm_c_100.working_start = 1; 173785bc17SMauro Carvalho Chehab deb_i2c("r100 before: %08x\n",r100->raw); 183785bc17SMauro Carvalho Chehab 193785bc17SMauro Carvalho Chehab fc->write_ibi_reg(fc, tw_sm_c_100, ibi_zero); 203785bc17SMauro Carvalho Chehab fc->write_ibi_reg(fc, tw_sm_c_100, *r100); /* initiating i2c operation */ 213785bc17SMauro Carvalho Chehab 223785bc17SMauro Carvalho Chehab for (i = 0; i < FC_MAX_I2C_RETRIES; i++) { 233785bc17SMauro Carvalho Chehab r = fc->read_ibi_reg(fc, tw_sm_c_100); 243785bc17SMauro Carvalho Chehab 253785bc17SMauro Carvalho Chehab if (!r.tw_sm_c_100.no_base_addr_ack_error) { 263785bc17SMauro Carvalho Chehab if (r.tw_sm_c_100.st_done) { 273785bc17SMauro Carvalho Chehab *r100 = r; 283785bc17SMauro Carvalho Chehab deb_i2c("i2c success\n"); 293785bc17SMauro Carvalho Chehab return 0; 303785bc17SMauro Carvalho Chehab } 313785bc17SMauro Carvalho Chehab } else { 323785bc17SMauro Carvalho Chehab deb_i2c("suffering from an i2c ack_error\n"); 333785bc17SMauro Carvalho Chehab return -EREMOTEIO; 343785bc17SMauro Carvalho Chehab } 353785bc17SMauro Carvalho Chehab } 36*d9942ad0SMauro Carvalho Chehab deb_i2c("tried %d times i2c operation, never finished or too many ack errors.\n", 37*d9942ad0SMauro Carvalho Chehab i); 383785bc17SMauro Carvalho Chehab return -EREMOTEIO; 393785bc17SMauro Carvalho Chehab } 403785bc17SMauro Carvalho Chehab 413785bc17SMauro Carvalho Chehab static int flexcop_i2c_read4(struct flexcop_i2c_adapter *i2c, 423785bc17SMauro Carvalho Chehab flexcop_ibi_value r100, u8 *buf) 433785bc17SMauro Carvalho Chehab { 443785bc17SMauro Carvalho Chehab flexcop_ibi_value r104; 453785bc17SMauro Carvalho Chehab int len = r100.tw_sm_c_100.total_bytes, 463785bc17SMauro Carvalho Chehab /* remember total_bytes is buflen-1 */ 473785bc17SMauro Carvalho Chehab ret; 483785bc17SMauro Carvalho Chehab 493785bc17SMauro Carvalho Chehab /* work-around to have CableStar2 and SkyStar2 rev 2.7 work 503785bc17SMauro Carvalho Chehab * correctly: 513785bc17SMauro Carvalho Chehab * 523785bc17SMauro Carvalho Chehab * the ITD1000 is behind an i2c-gate which closes automatically 533785bc17SMauro Carvalho Chehab * after an i2c-transaction the STV0297 needs 2 consecutive reads 543785bc17SMauro Carvalho Chehab * one with no_base_addr = 0 and one with 1 553785bc17SMauro Carvalho Chehab * 563785bc17SMauro Carvalho Chehab * those two work-arounds are conflictin: we check for the card 573785bc17SMauro Carvalho Chehab * type, it is set when probing the ITD1000 */ 583785bc17SMauro Carvalho Chehab if (i2c->fc->dev_type == FC_SKY_REV27) 593785bc17SMauro Carvalho Chehab r100.tw_sm_c_100.no_base_addr_ack_error = i2c->no_base_addr; 603785bc17SMauro Carvalho Chehab 613785bc17SMauro Carvalho Chehab ret = flexcop_i2c_operation(i2c->fc, &r100); 623785bc17SMauro Carvalho Chehab if (ret != 0) { 633785bc17SMauro Carvalho Chehab deb_i2c("Retrying operation\n"); 643785bc17SMauro Carvalho Chehab r100.tw_sm_c_100.no_base_addr_ack_error = i2c->no_base_addr; 653785bc17SMauro Carvalho Chehab ret = flexcop_i2c_operation(i2c->fc, &r100); 663785bc17SMauro Carvalho Chehab } 673785bc17SMauro Carvalho Chehab if (ret != 0) { 683785bc17SMauro Carvalho Chehab deb_i2c("read failed. %d\n", ret); 693785bc17SMauro Carvalho Chehab return ret; 703785bc17SMauro Carvalho Chehab } 713785bc17SMauro Carvalho Chehab 723785bc17SMauro Carvalho Chehab buf[0] = r100.tw_sm_c_100.data1_reg; 733785bc17SMauro Carvalho Chehab 743785bc17SMauro Carvalho Chehab if (len > 0) { 753785bc17SMauro Carvalho Chehab r104 = i2c->fc->read_ibi_reg(i2c->fc, tw_sm_c_104); 763785bc17SMauro Carvalho Chehab deb_i2c("read: r100: %08x, r104: %08x\n", r100.raw, r104.raw); 773785bc17SMauro Carvalho Chehab 783785bc17SMauro Carvalho Chehab /* there is at least one more byte, otherwise we wouldn't be here */ 793785bc17SMauro Carvalho Chehab buf[1] = r104.tw_sm_c_104.data2_reg; 803785bc17SMauro Carvalho Chehab if (len > 1) buf[2] = r104.tw_sm_c_104.data3_reg; 813785bc17SMauro Carvalho Chehab if (len > 2) buf[3] = r104.tw_sm_c_104.data4_reg; 823785bc17SMauro Carvalho Chehab } 833785bc17SMauro Carvalho Chehab return 0; 843785bc17SMauro Carvalho Chehab } 853785bc17SMauro Carvalho Chehab 863785bc17SMauro Carvalho Chehab static int flexcop_i2c_write4(struct flexcop_device *fc, 873785bc17SMauro Carvalho Chehab flexcop_ibi_value r100, u8 *buf) 883785bc17SMauro Carvalho Chehab { 893785bc17SMauro Carvalho Chehab flexcop_ibi_value r104; 903785bc17SMauro Carvalho Chehab int len = r100.tw_sm_c_100.total_bytes; /* remember total_bytes is buflen-1 */ 913785bc17SMauro Carvalho Chehab r104.raw = 0; 923785bc17SMauro Carvalho Chehab 933785bc17SMauro Carvalho Chehab /* there is at least one byte, otherwise we wouldn't be here */ 943785bc17SMauro Carvalho Chehab r100.tw_sm_c_100.data1_reg = buf[0]; 953785bc17SMauro Carvalho Chehab r104.tw_sm_c_104.data2_reg = len > 0 ? buf[1] : 0; 963785bc17SMauro Carvalho Chehab r104.tw_sm_c_104.data3_reg = len > 1 ? buf[2] : 0; 973785bc17SMauro Carvalho Chehab r104.tw_sm_c_104.data4_reg = len > 2 ? buf[3] : 0; 983785bc17SMauro Carvalho Chehab 993785bc17SMauro Carvalho Chehab deb_i2c("write: r100: %08x, r104: %08x\n", r100.raw, r104.raw); 1003785bc17SMauro Carvalho Chehab 1013785bc17SMauro Carvalho Chehab /* write the additional i2c data before doing the actual i2c operation */ 1023785bc17SMauro Carvalho Chehab fc->write_ibi_reg(fc, tw_sm_c_104, r104); 1033785bc17SMauro Carvalho Chehab return flexcop_i2c_operation(fc, &r100); 1043785bc17SMauro Carvalho Chehab } 1053785bc17SMauro Carvalho Chehab 1063785bc17SMauro Carvalho Chehab int flexcop_i2c_request(struct flexcop_i2c_adapter *i2c, 1073785bc17SMauro Carvalho Chehab flexcop_access_op_t op, u8 chipaddr, u8 addr, u8 *buf, u16 len) 1083785bc17SMauro Carvalho Chehab { 1093785bc17SMauro Carvalho Chehab int ret; 1103785bc17SMauro Carvalho Chehab 1113785bc17SMauro Carvalho Chehab #ifdef DUMP_I2C_MESSAGES 1123785bc17SMauro Carvalho Chehab int i; 1133785bc17SMauro Carvalho Chehab #endif 1143785bc17SMauro Carvalho Chehab 1153785bc17SMauro Carvalho Chehab u16 bytes_to_transfer; 1163785bc17SMauro Carvalho Chehab flexcop_ibi_value r100; 1173785bc17SMauro Carvalho Chehab 1183785bc17SMauro Carvalho Chehab deb_i2c("op = %d\n",op); 1193785bc17SMauro Carvalho Chehab r100.raw = 0; 1203785bc17SMauro Carvalho Chehab r100.tw_sm_c_100.chipaddr = chipaddr; 1213785bc17SMauro Carvalho Chehab r100.tw_sm_c_100.twoWS_rw = op; 1223785bc17SMauro Carvalho Chehab r100.tw_sm_c_100.twoWS_port_reg = i2c->port; 1233785bc17SMauro Carvalho Chehab 1243785bc17SMauro Carvalho Chehab #ifdef DUMP_I2C_MESSAGES 1253785bc17SMauro Carvalho Chehab printk(KERN_DEBUG "%d ", i2c->port); 1263785bc17SMauro Carvalho Chehab if (op == FC_READ) 1277887d371SMauro Carvalho Chehab printk(KERN_CONT "rd("); 1283785bc17SMauro Carvalho Chehab else 1297887d371SMauro Carvalho Chehab printk(KERN_CONT "wr("); 1307887d371SMauro Carvalho Chehab printk(KERN_CONT "%02x): %02x ", chipaddr, addr); 1313785bc17SMauro Carvalho Chehab #endif 1323785bc17SMauro Carvalho Chehab 1333785bc17SMauro Carvalho Chehab /* in that case addr is the only value -> 1343785bc17SMauro Carvalho Chehab * we write it twice as baseaddr and val0 1353785bc17SMauro Carvalho Chehab * BBTI is doing it like that for ISL6421 at least */ 1363785bc17SMauro Carvalho Chehab if (i2c->no_base_addr && len == 0 && op == FC_WRITE) { 1373785bc17SMauro Carvalho Chehab buf = &addr; 1383785bc17SMauro Carvalho Chehab len = 1; 1393785bc17SMauro Carvalho Chehab } 1403785bc17SMauro Carvalho Chehab 1413785bc17SMauro Carvalho Chehab while (len != 0) { 1423785bc17SMauro Carvalho Chehab bytes_to_transfer = len > 4 ? 4 : len; 1433785bc17SMauro Carvalho Chehab 1443785bc17SMauro Carvalho Chehab r100.tw_sm_c_100.total_bytes = bytes_to_transfer - 1; 1453785bc17SMauro Carvalho Chehab r100.tw_sm_c_100.baseaddr = addr; 1463785bc17SMauro Carvalho Chehab 1473785bc17SMauro Carvalho Chehab if (op == FC_READ) 1483785bc17SMauro Carvalho Chehab ret = flexcop_i2c_read4(i2c, r100, buf); 1493785bc17SMauro Carvalho Chehab else 1503785bc17SMauro Carvalho Chehab ret = flexcop_i2c_write4(i2c->fc, r100, buf); 1513785bc17SMauro Carvalho Chehab 1523785bc17SMauro Carvalho Chehab #ifdef DUMP_I2C_MESSAGES 1533785bc17SMauro Carvalho Chehab for (i = 0; i < bytes_to_transfer; i++) 1547887d371SMauro Carvalho Chehab printk(KERN_CONT "%02x ", buf[i]); 1553785bc17SMauro Carvalho Chehab #endif 1563785bc17SMauro Carvalho Chehab 1573785bc17SMauro Carvalho Chehab if (ret < 0) 1583785bc17SMauro Carvalho Chehab return ret; 1593785bc17SMauro Carvalho Chehab 1603785bc17SMauro Carvalho Chehab buf += bytes_to_transfer; 1613785bc17SMauro Carvalho Chehab addr += bytes_to_transfer; 1623785bc17SMauro Carvalho Chehab len -= bytes_to_transfer; 1633785bc17SMauro Carvalho Chehab } 1643785bc17SMauro Carvalho Chehab 1653785bc17SMauro Carvalho Chehab #ifdef DUMP_I2C_MESSAGES 1667887d371SMauro Carvalho Chehab printk(KERN_CONT "\n"); 1673785bc17SMauro Carvalho Chehab #endif 1683785bc17SMauro Carvalho Chehab 1693785bc17SMauro Carvalho Chehab return 0; 1703785bc17SMauro Carvalho Chehab } 1713785bc17SMauro Carvalho Chehab /* exported for PCI i2c */ 1723785bc17SMauro Carvalho Chehab EXPORT_SYMBOL(flexcop_i2c_request); 1733785bc17SMauro Carvalho Chehab 1743785bc17SMauro Carvalho Chehab /* master xfer callback for demodulator */ 1753785bc17SMauro Carvalho Chehab static int flexcop_master_xfer(struct i2c_adapter *i2c_adap, 1763785bc17SMauro Carvalho Chehab struct i2c_msg msgs[], int num) 1773785bc17SMauro Carvalho Chehab { 1783785bc17SMauro Carvalho Chehab struct flexcop_i2c_adapter *i2c = i2c_get_adapdata(i2c_adap); 1793785bc17SMauro Carvalho Chehab int i, ret = 0; 1803785bc17SMauro Carvalho Chehab 1813785bc17SMauro Carvalho Chehab /* Some drivers use 1 byte or 0 byte reads as probes, which this 1823785bc17SMauro Carvalho Chehab * driver doesn't support. These probes will always fail, so this 1833785bc17SMauro Carvalho Chehab * hack makes them always succeed. If one knew how, it would of 1843785bc17SMauro Carvalho Chehab * course be better to actually do the read. */ 1853785bc17SMauro Carvalho Chehab if (num == 1 && msgs[0].flags == I2C_M_RD && msgs[0].len <= 1) 1863785bc17SMauro Carvalho Chehab return 1; 1873785bc17SMauro Carvalho Chehab 1883785bc17SMauro Carvalho Chehab if (mutex_lock_interruptible(&i2c->fc->i2c_mutex)) 1893785bc17SMauro Carvalho Chehab return -ERESTARTSYS; 1903785bc17SMauro Carvalho Chehab 1913785bc17SMauro Carvalho Chehab for (i = 0; i < num; i++) { 1923785bc17SMauro Carvalho Chehab /* reading */ 1933785bc17SMauro Carvalho Chehab if (i+1 < num && (msgs[i+1].flags == I2C_M_RD)) { 1943785bc17SMauro Carvalho Chehab ret = i2c->fc->i2c_request(i2c, FC_READ, msgs[i].addr, 1953785bc17SMauro Carvalho Chehab msgs[i].buf[0], msgs[i+1].buf, 1963785bc17SMauro Carvalho Chehab msgs[i+1].len); 1973785bc17SMauro Carvalho Chehab i++; /* skip the following message */ 1983785bc17SMauro Carvalho Chehab } else /* writing */ 1993785bc17SMauro Carvalho Chehab ret = i2c->fc->i2c_request(i2c, FC_WRITE, msgs[i].addr, 2003785bc17SMauro Carvalho Chehab msgs[i].buf[0], &msgs[i].buf[1], 2013785bc17SMauro Carvalho Chehab msgs[i].len - 1); 2023785bc17SMauro Carvalho Chehab if (ret < 0) { 2033785bc17SMauro Carvalho Chehab deb_i2c("i2c master_xfer failed"); 2043785bc17SMauro Carvalho Chehab break; 2053785bc17SMauro Carvalho Chehab } 2063785bc17SMauro Carvalho Chehab } 2073785bc17SMauro Carvalho Chehab 2083785bc17SMauro Carvalho Chehab mutex_unlock(&i2c->fc->i2c_mutex); 2093785bc17SMauro Carvalho Chehab 2103785bc17SMauro Carvalho Chehab if (ret == 0) 2113785bc17SMauro Carvalho Chehab ret = num; 2123785bc17SMauro Carvalho Chehab return ret; 2133785bc17SMauro Carvalho Chehab } 2143785bc17SMauro Carvalho Chehab 2153785bc17SMauro Carvalho Chehab static u32 flexcop_i2c_func(struct i2c_adapter *adapter) 2163785bc17SMauro Carvalho Chehab { 2173785bc17SMauro Carvalho Chehab return I2C_FUNC_I2C; 2183785bc17SMauro Carvalho Chehab } 2193785bc17SMauro Carvalho Chehab 2203785bc17SMauro Carvalho Chehab static struct i2c_algorithm flexcop_algo = { 2213785bc17SMauro Carvalho Chehab .master_xfer = flexcop_master_xfer, 2223785bc17SMauro Carvalho Chehab .functionality = flexcop_i2c_func, 2233785bc17SMauro Carvalho Chehab }; 2243785bc17SMauro Carvalho Chehab 2253785bc17SMauro Carvalho Chehab int flexcop_i2c_init(struct flexcop_device *fc) 2263785bc17SMauro Carvalho Chehab { 2273785bc17SMauro Carvalho Chehab int ret; 2283785bc17SMauro Carvalho Chehab mutex_init(&fc->i2c_mutex); 2293785bc17SMauro Carvalho Chehab 2303785bc17SMauro Carvalho Chehab fc->fc_i2c_adap[0].fc = fc; 2313785bc17SMauro Carvalho Chehab fc->fc_i2c_adap[1].fc = fc; 2323785bc17SMauro Carvalho Chehab fc->fc_i2c_adap[2].fc = fc; 2333785bc17SMauro Carvalho Chehab fc->fc_i2c_adap[0].port = FC_I2C_PORT_DEMOD; 2343785bc17SMauro Carvalho Chehab fc->fc_i2c_adap[1].port = FC_I2C_PORT_EEPROM; 2353785bc17SMauro Carvalho Chehab fc->fc_i2c_adap[2].port = FC_I2C_PORT_TUNER; 2363785bc17SMauro Carvalho Chehab 2373785bc17SMauro Carvalho Chehab strlcpy(fc->fc_i2c_adap[0].i2c_adap.name, "B2C2 FlexCop I2C to demod", 2383785bc17SMauro Carvalho Chehab sizeof(fc->fc_i2c_adap[0].i2c_adap.name)); 2393785bc17SMauro Carvalho Chehab strlcpy(fc->fc_i2c_adap[1].i2c_adap.name, "B2C2 FlexCop I2C to eeprom", 2403785bc17SMauro Carvalho Chehab sizeof(fc->fc_i2c_adap[1].i2c_adap.name)); 2413785bc17SMauro Carvalho Chehab strlcpy(fc->fc_i2c_adap[2].i2c_adap.name, "B2C2 FlexCop I2C to tuner", 2423785bc17SMauro Carvalho Chehab sizeof(fc->fc_i2c_adap[2].i2c_adap.name)); 2433785bc17SMauro Carvalho Chehab 2443785bc17SMauro Carvalho Chehab i2c_set_adapdata(&fc->fc_i2c_adap[0].i2c_adap, &fc->fc_i2c_adap[0]); 2453785bc17SMauro Carvalho Chehab i2c_set_adapdata(&fc->fc_i2c_adap[1].i2c_adap, &fc->fc_i2c_adap[1]); 2463785bc17SMauro Carvalho Chehab i2c_set_adapdata(&fc->fc_i2c_adap[2].i2c_adap, &fc->fc_i2c_adap[2]); 2473785bc17SMauro Carvalho Chehab 2483785bc17SMauro Carvalho Chehab fc->fc_i2c_adap[0].i2c_adap.algo = 2493785bc17SMauro Carvalho Chehab fc->fc_i2c_adap[1].i2c_adap.algo = 2503785bc17SMauro Carvalho Chehab fc->fc_i2c_adap[2].i2c_adap.algo = &flexcop_algo; 2513785bc17SMauro Carvalho Chehab fc->fc_i2c_adap[0].i2c_adap.algo_data = 2523785bc17SMauro Carvalho Chehab fc->fc_i2c_adap[1].i2c_adap.algo_data = 2533785bc17SMauro Carvalho Chehab fc->fc_i2c_adap[2].i2c_adap.algo_data = NULL; 2543785bc17SMauro Carvalho Chehab fc->fc_i2c_adap[0].i2c_adap.dev.parent = 2553785bc17SMauro Carvalho Chehab fc->fc_i2c_adap[1].i2c_adap.dev.parent = 2563785bc17SMauro Carvalho Chehab fc->fc_i2c_adap[2].i2c_adap.dev.parent = fc->dev; 2573785bc17SMauro Carvalho Chehab 2583785bc17SMauro Carvalho Chehab ret = i2c_add_adapter(&fc->fc_i2c_adap[0].i2c_adap); 2593785bc17SMauro Carvalho Chehab if (ret < 0) 2603785bc17SMauro Carvalho Chehab return ret; 2613785bc17SMauro Carvalho Chehab 2623785bc17SMauro Carvalho Chehab ret = i2c_add_adapter(&fc->fc_i2c_adap[1].i2c_adap); 2633785bc17SMauro Carvalho Chehab if (ret < 0) 2643785bc17SMauro Carvalho Chehab goto adap_1_failed; 2653785bc17SMauro Carvalho Chehab 2663785bc17SMauro Carvalho Chehab ret = i2c_add_adapter(&fc->fc_i2c_adap[2].i2c_adap); 2673785bc17SMauro Carvalho Chehab if (ret < 0) 2683785bc17SMauro Carvalho Chehab goto adap_2_failed; 2693785bc17SMauro Carvalho Chehab 2703785bc17SMauro Carvalho Chehab fc->init_state |= FC_STATE_I2C_INIT; 2713785bc17SMauro Carvalho Chehab return 0; 2723785bc17SMauro Carvalho Chehab 2733785bc17SMauro Carvalho Chehab adap_2_failed: 2743785bc17SMauro Carvalho Chehab i2c_del_adapter(&fc->fc_i2c_adap[1].i2c_adap); 2753785bc17SMauro Carvalho Chehab adap_1_failed: 2763785bc17SMauro Carvalho Chehab i2c_del_adapter(&fc->fc_i2c_adap[0].i2c_adap); 2773785bc17SMauro Carvalho Chehab return ret; 2783785bc17SMauro Carvalho Chehab } 2793785bc17SMauro Carvalho Chehab 2803785bc17SMauro Carvalho Chehab void flexcop_i2c_exit(struct flexcop_device *fc) 2813785bc17SMauro Carvalho Chehab { 2823785bc17SMauro Carvalho Chehab if (fc->init_state & FC_STATE_I2C_INIT) { 2833785bc17SMauro Carvalho Chehab i2c_del_adapter(&fc->fc_i2c_adap[2].i2c_adap); 2843785bc17SMauro Carvalho Chehab i2c_del_adapter(&fc->fc_i2c_adap[1].i2c_adap); 2853785bc17SMauro Carvalho Chehab i2c_del_adapter(&fc->fc_i2c_adap[0].i2c_adap); 2863785bc17SMauro Carvalho Chehab } 2873785bc17SMauro Carvalho Chehab fc->init_state &= ~FC_STATE_I2C_INIT; 2883785bc17SMauro Carvalho Chehab } 289