290 lines
7.8 KiB
C
290 lines
7.8 KiB
C
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// 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, u8 addr, u8 *buf, u16 len)
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{
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int ret;
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#ifdef DUMP_I2C_MESSAGES
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int i;
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#endif
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u16 bytes_to_transfer;
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flexcop_ibi_value r100;
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deb_i2c("op = %d\n",op);
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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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#ifdef DUMP_I2C_MESSAGES
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printk(KERN_DEBUG "%d ", i2c->port);
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if (op == FC_READ)
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printk(KERN_CONT "rd(");
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else
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printk(KERN_CONT "wr(");
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printk(KERN_CONT "%02x): %02x ", chipaddr, addr);
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#endif
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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 = &addr;
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len = 1;
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}
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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, buf);
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else
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ret = flexcop_i2c_write4(i2c->fc, r100, buf);
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#ifdef DUMP_I2C_MESSAGES
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for (i = 0; i < bytes_to_transfer; i++)
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printk(KERN_CONT "%02x ", buf[i]);
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#endif
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if (ret < 0)
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return ret;
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buf += 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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#ifdef DUMP_I2C_MESSAGES
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printk(KERN_CONT "\n");
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#endif
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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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strlcpy(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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strlcpy(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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strlcpy(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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