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;
}
/* transfer functions */
static int bcm3510_writebytes (struct bcm3510_state *state, u8 reg, u8 *buf, u8 len)
{
u8 b[256];
int err;
struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = b, .len = len + 1 };
b[0] = reg;
memcpy(&b[1],buf,len);
deb_i2c("i2c wr %02x: ",reg);
dbufout(buf,len,deb_i2c);
deb_i2c("\n");
if ((err = i2c_transfer (state->i2c, &msg, 1)) != 1) {
deb_info("%s: i2c write error (addr %02x, reg %02x, err == %i)\n",
__func__, state->config->demod_address, reg, err);
return -EREMOTEIO;
}
return 0;
}
static int bcm3510_readbytes (struct bcm3510_state *state, u8 reg, u8 *buf, u8 len)
{
struct i2c_msg msg[] = {
{ .addr = state->config->demod_address, .flags = 0, .buf = ®, .len = 1 },
{ .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = buf, .len = len }
};
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);
}
/* 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;
}
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("rd(");
else
printk("wr(");
printk("%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("%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("\n");
#endif
return 0;
}
static int technisat_usb2_i2c_access(struct usb_device *udev,
u8 device_addr, u8 *tx, u8 txlen, u8 *rx, u8 rxlen)
{
u8 b[64];
int ret, actual_length;
deb_i2c("i2c-access: %02x, tx: ", device_addr);
debug_dump(tx, txlen, deb_i2c);
deb_i2c(" ");
if (txlen > 62) {
err("i2c TX buffer can't exceed 62 bytes (dev 0x%02x)",
device_addr);
txlen = 62;
}
if (rxlen > 62) {
err("i2c RX buffer can't exceed 62 bytes (dev 0x%02x)",
device_addr);
txlen = 62;
}
b[0] = I2C_SPEED_100KHZ_BIT;
b[1] = device_addr << 1;
if (rx != NULL) {
b[0] |= rxlen;
b[1] |= 1;
}
memcpy(&b[2], tx, txlen);
ret = usb_bulk_msg(udev,
usb_sndbulkpipe(udev, 0x01),
b, 2 + txlen,
NULL, 1000);
if (ret < 0) {
err("i2c-error: out failed %02x = %d", device_addr, ret);
return -ENODEV;
}
ret = usb_bulk_msg(udev,
usb_rcvbulkpipe(udev, 0x01),
b, 64, &actual_length, 1000);
if (ret < 0) {
err("i2c-error: in failed %02x = %d", device_addr, ret);
return -ENODEV;
}
if (b[0] != I2C_STATUS_OK) {
err("i2c-error: %02x = %d", device_addr, b[0]);
/* handle tuner-i2c-nak */
if (!(b[0] == I2C_STATUS_NAK &&
device_addr == 0x60
/* && device_is_technisat_usb2 */))
return -ENODEV;
}
deb_i2c("status: %d, ", b[0]);
if (rx != NULL) {
memcpy(rx, &b[2], rxlen);
deb_i2c("rx (%d): ", rxlen);
debug_dump(rx, rxlen, deb_i2c);
}
deb_i2c("\n");
return 0;
}
