On 14.10.2013 03:10, Antti Palosaari wrote:
kernel: usb 1-2: rtl2832u_tuner_attach:
kernel: e4000 5-0064: e4000_probe:
kernel: usb 1-2: rtl2832u_tuner_attach: client ptr ffff88030a849000
See attached patch.
Is there any way to return error to caller?
Abuse platform data ptr from struct i2c_board_info and call
i2c_unregister_device() ?
Answer to myself: best option seems to be check i2c_get_clientdata()
pointer after i2c_new_device().
client = i2c_new_device(&d->i2c_adap, &info);
if (client)
if (i2c_get_clientdata(client) == NULL)
// OOPS, I2C probe fails
That is because it is set NULL in error case by really_probe() in
drivers/base/dd.c. Error status is also cleared there with comment:
/*
* Ignore errors returned by ->probe so that the next driver can try
* its luck.
*/
That is told in I2C documentation too:
Note that starting with kernel 2.6.34, you don't have to set the `data'
field
to NULL in remove() or if probe() failed anymore. The i2c-core does this
automatically on these occasions. Those are also the only times the core
will
touch this field.
But maybe the comment for actual function, i2c_new_device, is still a
bit misleading as it says NULL is returned for the error. All the other
errors yes, but not for the I2C .probe() as it is reseted by device core.
* This returns the new i2c client, which may be saved for later use with
* i2c_unregister_device(); or NULL to indicate an error.
*/
struct i2c_client *
i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info)
regards
Antti
regards
Antti
---
drivers/media/tuners/e4000.c | 31 +++++++++++++++++++++++++++++++
drivers/media/usb/dvb-usb-v2/rtl28xxu.c | 18 ++++++++++++++++--
2 files changed, 47 insertions(+), 2 deletions(-)
diff --git a/drivers/media/tuners/e4000.c b/drivers/media/tuners/e4000.c
index 54e2d8a..f4e0567 100644
--- a/drivers/media/tuners/e4000.c
+++ b/drivers/media/tuners/e4000.c
@@ -442,6 +442,37 @@ err:
}
EXPORT_SYMBOL(e4000_attach);
+static int e4000_probe(struct i2c_client *client, const struct i2c_device_id
*did)
+{
+ dev_info(&client->dev, "%s:\n", __func__);
+ return -ENODEV;
+}
+
+static int e4000_remove(struct i2c_client *client)
+{
+ dev_info(&client->dev, "%s:\n", __func__);
+ return 0;
+}
+
+static const struct i2c_device_id e4000_id[] = {
+ {"e4000", 0},
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, e4000_id);
+
+static struct i2c_driver e4000_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "e4000",
+ },
+ .probe = e4000_probe,
+ .remove = e4000_remove,
+ .id_table = e4000_id,
+};
+
+module_i2c_driver(e4000_driver);
+
MODULE_DESCRIPTION("Elonics E4000 silicon tuner driver");
MODULE_AUTHOR("Antti Palosaari <[email protected]>");
MODULE_LICENSE("GPL");
diff --git a/drivers/media/usb/dvb-usb-v2/rtl28xxu.c
b/drivers/media/usb/dvb-usb-v2/rtl28xxu.c
index defc491..fbbe867 100644
--- a/drivers/media/usb/dvb-usb-v2/rtl28xxu.c
+++ b/drivers/media/usb/dvb-usb-v2/rtl28xxu.c
@@ -898,8 +898,22 @@ static int rtl2832u_tuner_attach(struct dvb_usb_adapter
*adap)
adap->fe[0]->ops.tuner_ops.get_rf_strength;
return 0;
case TUNER_RTL2832_E4000:
- fe = dvb_attach(e4000_attach, adap->fe[0], &d->i2c_adap,
- &rtl2832u_e4000_config);
+// fe = dvb_attach(e4000_attach, adap->fe[0], &d->i2c_adap,
+// &rtl2832u_e4000_config);
+ {
+ static const struct i2c_board_info info = {
+ .type = "e4000",
+ .addr = 0x64,
+ };
+ struct i2c_client *client;
+
+ fe = NULL;
+ client = i2c_new_device(&d->i2c_adap, &info);
+ if (IS_ERR_OR_NULL(client))
+ dev_err(&d->udev->dev, "e4000 probe failed\n");
+
+ dev_dbg(&d->udev->dev, "%s: client ptr %p\n", __func__,
client);
+ }
break;
case TUNER_RTL2832_FC2580:
fe = dvb_attach(fc2580_attach, adap->fe[0], &d->i2c_adap,
--
http://palosaari.fi/
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