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Subject[DVB patch 10/11] flexcop: i2c read fixes
rewrote the i2c-reading-part (no more ack-error ignoring, which was inherited
from the skystar2-driver)

Signed-off-by: Patrick Boettcher <pb@linuxtv.org>
Signed-off-by: Johannes Stezenbach <js@linuxtv.org>
---
drivers/media/dvb/b2c2/flexcop-i2c.c | 116 ++++++++++++++++++-----------------
drivers/media/dvb/b2c2/flexcop-reg.h | 3
drivers/media/dvb/b2c2/flexcop.c | 4 -
3 files changed, 63 insertions(+), 60 deletions(-)
Index: linux-2.6.12-rc4/drivers/media/dvb/b2c2/flexcop-i2c.c
===================================================================
--- linux-2.6.12-rc4.orig/drivers/media/dvb/b2c2/flexcop-i2c.c 2005-05-12 01:30:04.000000000 +0200
+++ linux-2.6.12-rc4/drivers/media/dvb/b2c2/flexcop-i2c.c 2005-05-12 01:31:10.000000000 +0200
@@ -9,9 +9,9 @@

#define FC_MAX_I2C_RETRIES 100000

-static int flexcop_i2c_operation(struct flexcop_device *fc, flexcop_ibi_value *r100, int max_ack_errors)
+static int flexcop_i2c_operation(struct flexcop_device *fc, flexcop_ibi_value *r100)
{
- int i,ack_errors = 0;
+ int i;
flexcop_ibi_value r;

r100->tw_sm_c_100.working_start = 1;
@@ -31,11 +31,7 @@ static int flexcop_i2c_operation(struct
}
} else {
deb_i2c("suffering from an i2c ack_error\n");
- if (++ack_errors >= max_ack_errors)
- break;
-
- fc->write_ibi_reg(fc, tw_sm_c_100, ibi_zero);
- fc->write_ibi_reg(fc, tw_sm_c_100, *r100);
+ return -EREMOTEIO;
}
}
deb_i2c("tried %d times i2c operation, never finished or too many ack errors.\n",i);
@@ -48,19 +44,30 @@ static int flexcop_i2c_read4(struct flex
int len = r100.tw_sm_c_100.total_bytes, /* remember total_bytes is buflen-1 */
ret;

- if ((ret = flexcop_i2c_operation(fc,&r100,30)) != 0)
- return ret;
-
- r104 = fc->read_ibi_reg(fc,tw_sm_c_104);
-
- deb_i2c("read: r100: %08x, r104: %08x\n",r100.raw,r104.raw);
+ if ((ret = flexcop_i2c_operation(fc,&r100)) != 0) {
+ /* The Cablestar needs a different kind of i2c-transfer (does not
+ * support "Repeat Start"):
+ * wait for the ACK failure,
+ * and do a subsequent read with the Bit 30 enabled
+ */
+ r100.tw_sm_c_100.no_base_addr_ack_error = 1;
+ if ((ret = flexcop_i2c_operation(fc,&r100)) != 0) {
+ deb_i2c("no_base_addr read failed. %d\n",ret);
+ return ret;
+ }
+ }

- /* there is at least one byte, otherwise we wouldn't be here */
buf[0] = r100.tw_sm_c_100.data1_reg;

- if (len > 0) 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;
+ if (len > 0) {
+ r104 = fc->read_ibi_reg(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;
}
@@ -82,9 +89,45 @@ static int flexcop_i2c_write4(struct fle

/* 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_device *fc, flexcop_access_op_t op,
+ flexcop_i2c_port_t port, u8 chipaddr, u8 addr, u8 *buf, u16 len)
+{
+ int ret;
+ 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 = port;
+
+ 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(fc, r100, buf);
+ else
+ ret = flexcop_i2c_write4(fc,r100, buf);
+
+ if (ret < 0)
+ return ret;
+
+ buf += bytes_to_transfer;
+ addr += bytes_to_transfer;
+ len -= bytes_to_transfer;
+ };

- return flexcop_i2c_operation(fc,&r100,30);
+ 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)
@@ -123,43 +166,6 @@ static int flexcop_master_xfer(struct i2
return ret;
}

-int flexcop_i2c_request(struct flexcop_device *fc, flexcop_access_op_t op,
- flexcop_i2c_port_t port, u8 chipaddr, u8 addr, u8 *buf, u16 len)
-{
- int ret;
- 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 = port;
-
- 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(fc, r100, buf);
- else
- ret = flexcop_i2c_write4(fc,r100, buf);
-
- if (ret < 0)
- return ret;
-
- buf += bytes_to_transfer;
- addr += bytes_to_transfer;
- len -= bytes_to_transfer;
- };
-
- return 0;
-}
-/* exported for PCI i2c */
-EXPORT_SYMBOL(flexcop_i2c_request);
-
static u32 flexcop_i2c_func(struct i2c_adapter *adapter)
{
return I2C_FUNC_I2C;
Index: linux-2.6.12-rc4/drivers/media/dvb/b2c2/flexcop-reg.h
===================================================================
--- linux-2.6.12-rc4.orig/drivers/media/dvb/b2c2/flexcop-reg.h 2005-05-12 01:30:04.000000000 +0200
+++ linux-2.6.12-rc4/drivers/media/dvb/b2c2/flexcop-reg.h 2005-05-12 01:31:10.000000000 +0200
@@ -692,9 +692,10 @@ typedef enum {
wan_ctrl_reg_71c = 0x71c,
} flexcop_ibi_register;

-#define flexcop_set_ibi_value(reg,attr,val) \
+#define flexcop_set_ibi_value(reg,attr,val) { \
flexcop_ibi_value v = fc->read_ibi_reg(fc,reg); \
v.reg.attr = val; \
fc->write_ibi_reg(fc,reg,v); \
+}

#endif
Index: linux-2.6.12-rc4/drivers/media/dvb/b2c2/flexcop.c
===================================================================
--- linux-2.6.12-rc4.orig/drivers/media/dvb/b2c2/flexcop.c 2005-05-12 01:30:55.000000000 +0200
+++ linux-2.6.12-rc4/drivers/media/dvb/b2c2/flexcop.c 2005-05-12 01:31:10.000000000 +0200
@@ -184,10 +184,6 @@ static void flexcop_reset(struct flexcop
fc->write_ibi_reg(fc,misc_204,v204);
v204.misc_204.Per_reset_sig = 1;
fc->write_ibi_reg(fc,misc_204,v204);
-
-/* v208.raw = 0;
- v208.ctrl_208.Null_filter_sig = 1;
- fc->write_ibi_reg(fc,ctrl_208,v208);*/
}

struct flexcop_device *flexcop_device_kmalloc(size_t bus_specific_len)
--

-
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