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[PATCH] dvb: flexcop: i2c read fixes

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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>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Johannes Stezenbach 2005-05-16 21:54:18 -07:00 committed by Linus Torvalds
parent c6ee197ccf
commit bdc7800122
3 changed files with 64 additions and 61 deletions
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118
drivers/media/dvb/b2c2/flexcop-i2c.c
View file

@ -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 flexcop_device *fc, flexcop_ibi_value *r
}
} 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 flexcop_device *fc, flexcop_ibi_value r100,
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;
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;
}
}
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 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;
}
@ -82,45 +89,7 @@ static int flexcop_i2c_write4(struct flexcop_device *fc, flexcop_ibi_value r100,
/* 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,&r100,30);
}
/* master xfer callback for demodulator */
static int flexcop_master_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[], int num)
{
struct flexcop_device *fc = i2c_get_adapdata(i2c_adap);
int i, ret = 0;
if (down_interruptible(&fc->i2c_sem))
return -ERESTARTSYS;
/* reading */
if (num == 2 &&
msgs[0].flags == 0 &&
msgs[1].flags == I2C_M_RD &&
msgs[0].buf != NULL &&
msgs[1].buf != NULL) {
ret = fc->i2c_request(fc, FC_READ, FC_I2C_PORT_DEMOD, msgs[0].addr, msgs[0].buf[0], msgs[1].buf, msgs[1].len);
} else for (i = 0; i < num; i++) { /* writing command */
if (msgs[i].flags != 0 || msgs[i].buf == NULL || msgs[i].len < 2) {
ret = -EINVAL;
break;
}
ret = fc->i2c_request(fc, FC_WRITE, FC_I2C_PORT_DEMOD, msgs[i].addr, msgs[i].buf[0], &msgs[i].buf[1], msgs[i].len - 1);
}
if (ret < 0)
err("i2c master_xfer failed");
else
ret = num;
up(&fc->i2c_sem);
return ret;
return flexcop_i2c_operation(fc,&r100);
}
int flexcop_i2c_request(struct flexcop_device *fc, flexcop_access_op_t op,
@ -160,6 +129,43 @@ int flexcop_i2c_request(struct flexcop_device *fc, flexcop_access_op_t op,
/* 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_device *fc = i2c_get_adapdata(i2c_adap);
int i, ret = 0;
if (down_interruptible(&fc->i2c_sem))
return -ERESTARTSYS;
/* reading */
if (num == 2 &&
msgs[0].flags == 0 &&
msgs[1].flags == I2C_M_RD &&
msgs[0].buf != NULL &&
msgs[1].buf != NULL) {
ret = fc->i2c_request(fc, FC_READ, FC_I2C_PORT_DEMOD, msgs[0].addr, msgs[0].buf[0], msgs[1].buf, msgs[1].len);
} else for (i = 0; i < num; i++) { /* writing command */
if (msgs[i].flags != 0 || msgs[i].buf == NULL || msgs[i].len < 2) {
ret = -EINVAL;
break;
}
ret = fc->i2c_request(fc, FC_WRITE, FC_I2C_PORT_DEMOD, msgs[i].addr, msgs[i].buf[0], &msgs[i].buf[1], msgs[i].len - 1);
}
if (ret < 0)
err("i2c master_xfer failed");
else
ret = num;
up(&fc->i2c_sem);
return ret;
}
static u32 flexcop_i2c_func(struct i2c_adapter *adapter)
{
return I2C_FUNC_I2C;

3
drivers/media/dvb/b2c2/flexcop-reg.h
View file

@ -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

4
drivers/media/dvb/b2c2/flexcop.c
View file

@ -184,10 +184,6 @@ static void flexcop_reset(struct flexcop_device *fc)
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)