281 lines
7.7 KiB
C
281 lines
7.7 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
/*
|
||
|
|
* 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 start_addr, u8 *buf, u16 size)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
int len = size;
|
||
|
|
u8 *p;
|
||
|
|
u8 addr = start_addr;
|
||
|
|
|
||
|
|
u16 bytes_to_transfer;
|
||
|
|
flexcop_ibi_value r100;
|
||
|
|
|
||
|
|
deb_i2c("port %d %s(%02x): register %02x, size: %d\n",
|
||
|
|
i2c->port,
|
||
|
|
op == FC_READ ? "rd" : "wr",
|
||
|
|
chipaddr, start_addr, size);
|
||
|
|
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;
|
||
|
|
|
||
|
|
/* 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 = &start_addr;
|
||
|
|
len = 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
p = buf;
|
||
|
|
|
||
|
|
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, p);
|
||
|
|
else
|
||
|
|
ret = flexcop_i2c_write4(i2c->fc, r100, p);
|
||
|
|
|
||
|
|
if (ret < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
p += bytes_to_transfer;
|
||
|
|
addr += bytes_to_transfer;
|
||
|
|
len -= bytes_to_transfer;
|
||
|
|
}
|
||
|
|
deb_i2c_dump("port %d %s(%02x): register %02x: %*ph\n",
|
||
|
|
i2c->port,
|
||
|
|
op == FC_READ ? "rd" : "wr",
|
||
|
|
chipaddr, start_addr, size, buf);
|
||
|
|
|
||
|
|
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;
|
||
|
|
|
||
|
|
strscpy(fc->fc_i2c_adap[0].i2c_adap.name, "B2C2 FlexCop I2C to demod",
|
||
|
|
sizeof(fc->fc_i2c_adap[0].i2c_adap.name));
|
||
|
|
strscpy(fc->fc_i2c_adap[1].i2c_adap.name, "B2C2 FlexCop I2C to eeprom",
|
||
|
|
sizeof(fc->fc_i2c_adap[1].i2c_adap.name));
|
||
|
|
strscpy(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;
|
||
|
|
}
|