#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;
}
} 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);
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;
}
/* 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,
/* 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 (mutex_lock_interruptible(&fc->i2c_mutex))
+ 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;
+
+ mutex_unlock(&fc->i2c_mutex);
+
+ return ret;
+}
+
static u32 flexcop_i2c_func(struct i2c_adapter *adapter)
{
return I2C_FUNC_I2C;
}
static struct i2c_algorithm flexcop_algo = {
- .name = "FlexCop I2C algorithm",
- .id = I2C_ALGO_BIT,
.master_xfer = flexcop_master_xfer,
.functionality = flexcop_i2c_func,
};
{
int ret;
- sema_init(&fc->i2c_sem,1);
+ mutex_init(&fc->i2c_mutex);
memset(&fc->i2c_adap, 0, sizeof(struct i2c_adapter));
strncpy(fc->i2c_adap.name, "B2C2 FlexCop device",I2C_NAME_SIZE);
fc->i2c_adap.class = I2C_CLASS_TV_DIGITAL;
fc->i2c_adap.algo = &flexcop_algo;
fc->i2c_adap.algo_data = NULL;
- fc->i2c_adap.id = I2C_ALGO_BIT;
if ((ret = i2c_add_adapter(&fc->i2c_adap)) < 0)
return ret;
projects / firefly-linux-kernel-4.4.55.git / blobdiff