| /* |
| * Linux driver for digital TV devices equipped with B2C2 FlexcopII(b)/III |
| * flexcop-i2c.c - flexcop internal 2Wire bus (I2C) and dvb i2c initialization |
| * see flexcop.c for copyright information |
| */ |
| #include "flexcop.h" |
| |
| #define FC_MAX_I2C_RETRIES 100000 |
| |
| static int flexcop_i2c_operation(struct flexcop_device *fc, |
| flexcop_ibi_value *r100) |
| { |
| int i; |
| flexcop_ibi_value r; |
| |
| r100->tw_sm_c_100.working_start = 1; |
| deb_i2c("r100 before: %08x\n",r100->raw); |
| |
| fc->write_ibi_reg(fc, tw_sm_c_100, ibi_zero); |
| fc->write_ibi_reg(fc, tw_sm_c_100, *r100); /* initiating i2c operation */ |
| |
| for (i = 0; i < FC_MAX_I2C_RETRIES; i++) { |
| r = fc->read_ibi_reg(fc, tw_sm_c_100); |
| |
| if (!r.tw_sm_c_100.no_base_addr_ack_error) { |
| if (r.tw_sm_c_100.st_done) { |
| *r100 = r; |
| deb_i2c("i2c success\n"); |
| return 0; |
| } |
| } else { |
| deb_i2c("suffering from an i2c ack_error\n"); |
| return -EREMOTEIO; |
| } |
| } |
| deb_i2c("tried %d times i2c operation, never finished or too many ack errors.\n", |
| i); |
| return -EREMOTEIO; |
| } |
| |
| static int flexcop_i2c_read4(struct flexcop_i2c_adapter *i2c, |
| flexcop_ibi_value r100, u8 *buf) |
| { |
| flexcop_ibi_value r104; |
| int len = r100.tw_sm_c_100.total_bytes, |
| /* remember total_bytes is buflen-1 */ |
| ret; |
| |
| /* work-around to have CableStar2 and SkyStar2 rev 2.7 work |
| * correctly: |
| * |
| * the ITD1000 is behind an i2c-gate which closes automatically |
| * after an i2c-transaction the STV0297 needs 2 consecutive reads |
| * one with no_base_addr = 0 and one with 1 |
| * |
| * those two work-arounds are conflictin: we check for the card |
| * type, it is set when probing the ITD1000 */ |
| if (i2c->fc->dev_type == FC_SKY_REV27) |
| r100.tw_sm_c_100.no_base_addr_ack_error = i2c->no_base_addr; |
| |
| ret = flexcop_i2c_operation(i2c->fc, &r100); |
| if (ret != 0) { |
| deb_i2c("Retrying operation\n"); |
| r100.tw_sm_c_100.no_base_addr_ack_error = i2c->no_base_addr; |
| ret = flexcop_i2c_operation(i2c->fc, &r100); |
| } |
| if (ret != 0) { |
| deb_i2c("read failed. %d\n", ret); |
| return ret; |
| } |
| |
| buf[0] = r100.tw_sm_c_100.data1_reg; |
| |
| if (len > 0) { |
| r104 = i2c->fc->read_ibi_reg(i2c->fc, tw_sm_c_104); |
| deb_i2c("read: r100: %08x, r104: %08x\n", r100.raw, r104.raw); |
| |
| /* there is at least one more byte, otherwise we wouldn't be here */ |
| buf[1] = r104.tw_sm_c_104.data2_reg; |
| if (len > 1) buf[2] = r104.tw_sm_c_104.data3_reg; |
| if (len > 2) buf[3] = r104.tw_sm_c_104.data4_reg; |
| } |
| return 0; |
| } |
| |
| static int flexcop_i2c_write4(struct flexcop_device *fc, |
| flexcop_ibi_value r100, u8 *buf) |
| { |
| flexcop_ibi_value r104; |
| int len = r100.tw_sm_c_100.total_bytes; /* remember total_bytes is buflen-1 */ |
| r104.raw = 0; |
| |
| /* there is at least one byte, otherwise we wouldn't be here */ |
| r100.tw_sm_c_100.data1_reg = buf[0]; |
| r104.tw_sm_c_104.data2_reg = len > 0 ? buf[1] : 0; |
| r104.tw_sm_c_104.data3_reg = len > 1 ? buf[2] : 0; |
| r104.tw_sm_c_104.data4_reg = len > 2 ? buf[3] : 0; |
| |
| deb_i2c("write: r100: %08x, r104: %08x\n", r100.raw, r104.raw); |
| |
| /* write the additional i2c data before doing the actual i2c operation */ |
| fc->write_ibi_reg(fc, tw_sm_c_104, r104); |
| return flexcop_i2c_operation(fc, &r100); |
| } |
| |
| int flexcop_i2c_request(struct flexcop_i2c_adapter *i2c, |
| flexcop_access_op_t op, u8 chipaddr, u8 addr, u8 *buf, u16 len) |
| { |
| int ret; |
| |
| #ifdef DUMP_I2C_MESSAGES |
| int i; |
| #endif |
| |
| u16 bytes_to_transfer; |
| flexcop_ibi_value r100; |
| |
| deb_i2c("op = %d\n",op); |
| r100.raw = 0; |
| r100.tw_sm_c_100.chipaddr = chipaddr; |
| r100.tw_sm_c_100.twoWS_rw = op; |
| r100.tw_sm_c_100.twoWS_port_reg = i2c->port; |
| |
| #ifdef DUMP_I2C_MESSAGES |
| printk(KERN_DEBUG "%d ", i2c->port); |
| if (op == FC_READ) |
| printk(KERN_CONT "rd("); |
| else |
| printk(KERN_CONT "wr("); |
| printk(KERN_CONT "%02x): %02x ", chipaddr, addr); |
| #endif |
| |
| /* in that case addr is the only value -> |
| * we write it twice as baseaddr and val0 |
| * BBTI is doing it like that for ISL6421 at least */ |
| if (i2c->no_base_addr && len == 0 && op == FC_WRITE) { |
| buf = &addr; |
| len = 1; |
| } |
| |
| while (len != 0) { |
| bytes_to_transfer = len > 4 ? 4 : len; |
| |
| r100.tw_sm_c_100.total_bytes = bytes_to_transfer - 1; |
| r100.tw_sm_c_100.baseaddr = addr; |
| |
| if (op == FC_READ) |
| ret = flexcop_i2c_read4(i2c, r100, buf); |
| else |
| ret = flexcop_i2c_write4(i2c->fc, r100, buf); |
| |
| #ifdef DUMP_I2C_MESSAGES |
| for (i = 0; i < bytes_to_transfer; i++) |
| printk(KERN_CONT "%02x ", buf[i]); |
| #endif |
| |
| if (ret < 0) |
| return ret; |
| |
| buf += bytes_to_transfer; |
| addr += bytes_to_transfer; |
| len -= bytes_to_transfer; |
| } |
| |
| #ifdef DUMP_I2C_MESSAGES |
| printk(KERN_CONT "\n"); |
| #endif |
| |
| return 0; |
| } |
| /* exported for PCI i2c */ |
| EXPORT_SYMBOL(flexcop_i2c_request); |
| |
| /* master xfer callback for demodulator */ |
| static int flexcop_master_xfer(struct i2c_adapter *i2c_adap, |
| struct i2c_msg msgs[], int num) |
| { |
| struct flexcop_i2c_adapter *i2c = i2c_get_adapdata(i2c_adap); |
| int i, ret = 0; |
| |
| /* Some drivers use 1 byte or 0 byte reads as probes, which this |
| * driver doesn't support. These probes will always fail, so this |
| * hack makes them always succeed. If one knew how, it would of |
| * course be better to actually do the read. */ |
| if (num == 1 && msgs[0].flags == I2C_M_RD && msgs[0].len <= 1) |
| return 1; |
| |
| if (mutex_lock_interruptible(&i2c->fc->i2c_mutex)) |
| return -ERESTARTSYS; |
| |
| for (i = 0; i < num; i++) { |
| /* reading */ |
| if (i+1 < num && (msgs[i+1].flags == I2C_M_RD)) { |
| ret = i2c->fc->i2c_request(i2c, FC_READ, msgs[i].addr, |
| msgs[i].buf[0], msgs[i+1].buf, |
| msgs[i+1].len); |
| i++; /* skip the following message */ |
| } else /* writing */ |
| ret = i2c->fc->i2c_request(i2c, FC_WRITE, msgs[i].addr, |
| msgs[i].buf[0], &msgs[i].buf[1], |
| msgs[i].len - 1); |
| if (ret < 0) { |
| deb_i2c("i2c master_xfer failed"); |
| break; |
| } |
| } |
| |
| mutex_unlock(&i2c->fc->i2c_mutex); |
| |
| if (ret == 0) |
| ret = num; |
| return ret; |
| } |
| |
| static u32 flexcop_i2c_func(struct i2c_adapter *adapter) |
| { |
| return I2C_FUNC_I2C; |
| } |
| |
| static struct i2c_algorithm flexcop_algo = { |
| .master_xfer = flexcop_master_xfer, |
| .functionality = flexcop_i2c_func, |
| }; |
| |
| int flexcop_i2c_init(struct flexcop_device *fc) |
| { |
| int ret; |
| mutex_init(&fc->i2c_mutex); |
| |
| fc->fc_i2c_adap[0].fc = fc; |
| fc->fc_i2c_adap[1].fc = fc; |
| fc->fc_i2c_adap[2].fc = fc; |
| fc->fc_i2c_adap[0].port = FC_I2C_PORT_DEMOD; |
| fc->fc_i2c_adap[1].port = FC_I2C_PORT_EEPROM; |
| fc->fc_i2c_adap[2].port = FC_I2C_PORT_TUNER; |
| |
| strlcpy(fc->fc_i2c_adap[0].i2c_adap.name, "B2C2 FlexCop I2C to demod", |
| sizeof(fc->fc_i2c_adap[0].i2c_adap.name)); |
| strlcpy(fc->fc_i2c_adap[1].i2c_adap.name, "B2C2 FlexCop I2C to eeprom", |
| sizeof(fc->fc_i2c_adap[1].i2c_adap.name)); |
| strlcpy(fc->fc_i2c_adap[2].i2c_adap.name, "B2C2 FlexCop I2C to tuner", |
| sizeof(fc->fc_i2c_adap[2].i2c_adap.name)); |
| |
| i2c_set_adapdata(&fc->fc_i2c_adap[0].i2c_adap, &fc->fc_i2c_adap[0]); |
| i2c_set_adapdata(&fc->fc_i2c_adap[1].i2c_adap, &fc->fc_i2c_adap[1]); |
| i2c_set_adapdata(&fc->fc_i2c_adap[2].i2c_adap, &fc->fc_i2c_adap[2]); |
| |
| fc->fc_i2c_adap[0].i2c_adap.algo = |
| fc->fc_i2c_adap[1].i2c_adap.algo = |
| fc->fc_i2c_adap[2].i2c_adap.algo = &flexcop_algo; |
| fc->fc_i2c_adap[0].i2c_adap.algo_data = |
| fc->fc_i2c_adap[1].i2c_adap.algo_data = |
| fc->fc_i2c_adap[2].i2c_adap.algo_data = NULL; |
| fc->fc_i2c_adap[0].i2c_adap.dev.parent = |
| fc->fc_i2c_adap[1].i2c_adap.dev.parent = |
| fc->fc_i2c_adap[2].i2c_adap.dev.parent = fc->dev; |
| |
| ret = i2c_add_adapter(&fc->fc_i2c_adap[0].i2c_adap); |
| if (ret < 0) |
| return ret; |
| |
| ret = i2c_add_adapter(&fc->fc_i2c_adap[1].i2c_adap); |
| if (ret < 0) |
| goto adap_1_failed; |
| |
| ret = i2c_add_adapter(&fc->fc_i2c_adap[2].i2c_adap); |
| if (ret < 0) |
| goto adap_2_failed; |
| |
| fc->init_state |= FC_STATE_I2C_INIT; |
| return 0; |
| |
| adap_2_failed: |
| i2c_del_adapter(&fc->fc_i2c_adap[1].i2c_adap); |
| adap_1_failed: |
| i2c_del_adapter(&fc->fc_i2c_adap[0].i2c_adap); |
| return ret; |
| } |
| |
| void flexcop_i2c_exit(struct flexcop_device *fc) |
| { |
| if (fc->init_state & FC_STATE_I2C_INIT) { |
| i2c_del_adapter(&fc->fc_i2c_adap[2].i2c_adap); |
| i2c_del_adapter(&fc->fc_i2c_adap[1].i2c_adap); |
| i2c_del_adapter(&fc->fc_i2c_adap[0].i2c_adap); |
| } |
| fc->init_state &= ~FC_STATE_I2C_INIT; |
| } |