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280 lines
7.7 KiB
280 lines
7.7 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Linux driver for digital TV devices equipped with B2C2 FlexcopII(b)/III |
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* flexcop-i2c.c - flexcop internal 2Wire bus (I2C) and dvb i2c initialization |
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* see flexcop.c for copyright information |
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*/ |
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#include "flexcop.h" |
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#define FC_MAX_I2C_RETRIES 100000 |
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static int flexcop_i2c_operation(struct flexcop_device *fc, |
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flexcop_ibi_value *r100) |
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{ |
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int i; |
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flexcop_ibi_value r; |
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r100->tw_sm_c_100.working_start = 1; |
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deb_i2c("r100 before: %08x\n",r100->raw); |
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fc->write_ibi_reg(fc, tw_sm_c_100, ibi_zero); |
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fc->write_ibi_reg(fc, tw_sm_c_100, *r100); /* initiating i2c operation */ |
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for (i = 0; i < FC_MAX_I2C_RETRIES; i++) { |
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r = fc->read_ibi_reg(fc, tw_sm_c_100); |
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if (!r.tw_sm_c_100.no_base_addr_ack_error) { |
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if (r.tw_sm_c_100.st_done) { |
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*r100 = r; |
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deb_i2c("i2c success\n"); |
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return 0; |
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} |
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} else { |
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deb_i2c("suffering from an i2c ack_error\n"); |
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return -EREMOTEIO; |
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} |
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} |
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deb_i2c("tried %d times i2c operation, never finished or too many ack errors.\n", |
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i); |
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return -EREMOTEIO; |
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} |
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static int flexcop_i2c_read4(struct flexcop_i2c_adapter *i2c, |
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flexcop_ibi_value r100, u8 *buf) |
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{ |
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flexcop_ibi_value r104; |
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int len = r100.tw_sm_c_100.total_bytes, |
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/* remember total_bytes is buflen-1 */ |
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ret; |
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/* work-around to have CableStar2 and SkyStar2 rev 2.7 work |
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* correctly: |
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* |
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* the ITD1000 is behind an i2c-gate which closes automatically |
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* after an i2c-transaction the STV0297 needs 2 consecutive reads |
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* one with no_base_addr = 0 and one with 1 |
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* |
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* those two work-arounds are conflictin: we check for the card |
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* type, it is set when probing the ITD1000 */ |
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if (i2c->fc->dev_type == FC_SKY_REV27) |
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r100.tw_sm_c_100.no_base_addr_ack_error = i2c->no_base_addr; |
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ret = flexcop_i2c_operation(i2c->fc, &r100); |
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if (ret != 0) { |
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deb_i2c("Retrying operation\n"); |
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r100.tw_sm_c_100.no_base_addr_ack_error = i2c->no_base_addr; |
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ret = flexcop_i2c_operation(i2c->fc, &r100); |
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} |
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if (ret != 0) { |
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deb_i2c("read failed. %d\n", ret); |
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return ret; |
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} |
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buf[0] = r100.tw_sm_c_100.data1_reg; |
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if (len > 0) { |
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r104 = i2c->fc->read_ibi_reg(i2c->fc, tw_sm_c_104); |
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deb_i2c("read: r100: %08x, r104: %08x\n", r100.raw, r104.raw); |
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/* there is at least one more byte, otherwise we wouldn't be here */ |
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buf[1] = r104.tw_sm_c_104.data2_reg; |
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if (len > 1) buf[2] = r104.tw_sm_c_104.data3_reg; |
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if (len > 2) buf[3] = r104.tw_sm_c_104.data4_reg; |
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} |
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return 0; |
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} |
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static int flexcop_i2c_write4(struct flexcop_device *fc, |
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flexcop_ibi_value r100, u8 *buf) |
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{ |
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flexcop_ibi_value r104; |
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int len = r100.tw_sm_c_100.total_bytes; /* remember total_bytes is buflen-1 */ |
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r104.raw = 0; |
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/* there is at least one byte, otherwise we wouldn't be here */ |
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r100.tw_sm_c_100.data1_reg = buf[0]; |
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r104.tw_sm_c_104.data2_reg = len > 0 ? buf[1] : 0; |
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r104.tw_sm_c_104.data3_reg = len > 1 ? buf[2] : 0; |
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r104.tw_sm_c_104.data4_reg = len > 2 ? buf[3] : 0; |
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deb_i2c("write: r100: %08x, r104: %08x\n", r100.raw, r104.raw); |
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/* write the additional i2c data before doing the actual i2c operation */ |
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fc->write_ibi_reg(fc, tw_sm_c_104, r104); |
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return flexcop_i2c_operation(fc, &r100); |
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} |
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int flexcop_i2c_request(struct flexcop_i2c_adapter *i2c, |
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flexcop_access_op_t op, u8 chipaddr, |
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u8 start_addr, u8 *buf, u16 size) |
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{ |
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int ret; |
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int len = size; |
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u8 *p; |
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u8 addr = start_addr; |
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u16 bytes_to_transfer; |
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flexcop_ibi_value r100; |
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deb_i2c("port %d %s(%02x): register %02x, size: %d\n", |
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i2c->port, |
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op == FC_READ ? "rd" : "wr", |
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chipaddr, start_addr, size); |
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r100.raw = 0; |
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r100.tw_sm_c_100.chipaddr = chipaddr; |
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r100.tw_sm_c_100.twoWS_rw = op; |
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r100.tw_sm_c_100.twoWS_port_reg = i2c->port; |
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/* in that case addr is the only value -> |
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* we write it twice as baseaddr and val0 |
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* BBTI is doing it like that for ISL6421 at least */ |
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if (i2c->no_base_addr && len == 0 && op == FC_WRITE) { |
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buf = &start_addr; |
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len = 1; |
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} |
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p = buf; |
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while (len != 0) { |
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bytes_to_transfer = len > 4 ? 4 : len; |
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r100.tw_sm_c_100.total_bytes = bytes_to_transfer - 1; |
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r100.tw_sm_c_100.baseaddr = addr; |
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if (op == FC_READ) |
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ret = flexcop_i2c_read4(i2c, r100, p); |
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else |
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ret = flexcop_i2c_write4(i2c->fc, r100, p); |
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if (ret < 0) |
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return ret; |
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p += bytes_to_transfer; |
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addr += bytes_to_transfer; |
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len -= bytes_to_transfer; |
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} |
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deb_i2c_dump("port %d %s(%02x): register %02x: %*ph\n", |
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i2c->port, |
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op == FC_READ ? "rd" : "wr", |
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chipaddr, start_addr, size, buf); |
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return 0; |
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} |
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/* exported for PCI i2c */ |
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EXPORT_SYMBOL(flexcop_i2c_request); |
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/* master xfer callback for demodulator */ |
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static int flexcop_master_xfer(struct i2c_adapter *i2c_adap, |
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struct i2c_msg msgs[], int num) |
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{ |
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struct flexcop_i2c_adapter *i2c = i2c_get_adapdata(i2c_adap); |
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int i, ret = 0; |
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/* Some drivers use 1 byte or 0 byte reads as probes, which this |
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* driver doesn't support. These probes will always fail, so this |
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* hack makes them always succeed. If one knew how, it would of |
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* course be better to actually do the read. */ |
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if (num == 1 && msgs[0].flags == I2C_M_RD && msgs[0].len <= 1) |
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return 1; |
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if (mutex_lock_interruptible(&i2c->fc->i2c_mutex)) |
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return -ERESTARTSYS; |
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for (i = 0; i < num; i++) { |
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/* reading */ |
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if (i+1 < num && (msgs[i+1].flags == I2C_M_RD)) { |
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ret = i2c->fc->i2c_request(i2c, FC_READ, msgs[i].addr, |
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msgs[i].buf[0], msgs[i+1].buf, |
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msgs[i+1].len); |
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i++; /* skip the following message */ |
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} else /* writing */ |
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ret = i2c->fc->i2c_request(i2c, FC_WRITE, msgs[i].addr, |
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msgs[i].buf[0], &msgs[i].buf[1], |
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msgs[i].len - 1); |
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if (ret < 0) { |
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deb_i2c("i2c master_xfer failed"); |
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break; |
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} |
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} |
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mutex_unlock(&i2c->fc->i2c_mutex); |
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if (ret == 0) |
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ret = num; |
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return ret; |
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} |
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static u32 flexcop_i2c_func(struct i2c_adapter *adapter) |
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{ |
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return I2C_FUNC_I2C; |
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} |
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static struct i2c_algorithm flexcop_algo = { |
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.master_xfer = flexcop_master_xfer, |
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.functionality = flexcop_i2c_func, |
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}; |
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int flexcop_i2c_init(struct flexcop_device *fc) |
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{ |
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int ret; |
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mutex_init(&fc->i2c_mutex); |
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fc->fc_i2c_adap[0].fc = fc; |
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fc->fc_i2c_adap[1].fc = fc; |
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fc->fc_i2c_adap[2].fc = fc; |
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fc->fc_i2c_adap[0].port = FC_I2C_PORT_DEMOD; |
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fc->fc_i2c_adap[1].port = FC_I2C_PORT_EEPROM; |
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fc->fc_i2c_adap[2].port = FC_I2C_PORT_TUNER; |
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strscpy(fc->fc_i2c_adap[0].i2c_adap.name, "B2C2 FlexCop I2C to demod", |
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sizeof(fc->fc_i2c_adap[0].i2c_adap.name)); |
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strscpy(fc->fc_i2c_adap[1].i2c_adap.name, "B2C2 FlexCop I2C to eeprom", |
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sizeof(fc->fc_i2c_adap[1].i2c_adap.name)); |
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strscpy(fc->fc_i2c_adap[2].i2c_adap.name, "B2C2 FlexCop I2C to tuner", |
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sizeof(fc->fc_i2c_adap[2].i2c_adap.name)); |
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i2c_set_adapdata(&fc->fc_i2c_adap[0].i2c_adap, &fc->fc_i2c_adap[0]); |
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i2c_set_adapdata(&fc->fc_i2c_adap[1].i2c_adap, &fc->fc_i2c_adap[1]); |
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i2c_set_adapdata(&fc->fc_i2c_adap[2].i2c_adap, &fc->fc_i2c_adap[2]); |
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fc->fc_i2c_adap[0].i2c_adap.algo = |
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fc->fc_i2c_adap[1].i2c_adap.algo = |
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fc->fc_i2c_adap[2].i2c_adap.algo = &flexcop_algo; |
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fc->fc_i2c_adap[0].i2c_adap.algo_data = |
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fc->fc_i2c_adap[1].i2c_adap.algo_data = |
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fc->fc_i2c_adap[2].i2c_adap.algo_data = NULL; |
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fc->fc_i2c_adap[0].i2c_adap.dev.parent = |
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fc->fc_i2c_adap[1].i2c_adap.dev.parent = |
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fc->fc_i2c_adap[2].i2c_adap.dev.parent = fc->dev; |
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ret = i2c_add_adapter(&fc->fc_i2c_adap[0].i2c_adap); |
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if (ret < 0) |
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return ret; |
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ret = i2c_add_adapter(&fc->fc_i2c_adap[1].i2c_adap); |
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if (ret < 0) |
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goto adap_1_failed; |
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ret = i2c_add_adapter(&fc->fc_i2c_adap[2].i2c_adap); |
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if (ret < 0) |
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goto adap_2_failed; |
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fc->init_state |= FC_STATE_I2C_INIT; |
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return 0; |
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adap_2_failed: |
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i2c_del_adapter(&fc->fc_i2c_adap[1].i2c_adap); |
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adap_1_failed: |
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i2c_del_adapter(&fc->fc_i2c_adap[0].i2c_adap); |
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return ret; |
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} |
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void flexcop_i2c_exit(struct flexcop_device *fc) |
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{ |
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if (fc->init_state & FC_STATE_I2C_INIT) { |
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i2c_del_adapter(&fc->fc_i2c_adap[2].i2c_adap); |
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i2c_del_adapter(&fc->fc_i2c_adap[1].i2c_adap); |
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i2c_del_adapter(&fc->fc_i2c_adap[0].i2c_adap); |
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} |
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fc->init_state &= ~FC_STATE_I2C_INIT; |
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}
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