Some devices need to issue a pre-initialization command sequence via
i2c in order to "enable" the communication with some adapter components.
This happens for instance in the vp7049 USB DVB-T stick on which the
frontend cannot be detected without first sending a certain sequence of
commands via i2c.
Signed-off-by: Antonio Ospite <osp...@studenti.unina.it>
---
If this approach is OK I can send a similar patch for dvb-usb-v2.
Are all the dvb-usb drivers going to be ported to dvb-usb-v2 eventually?
drivers/media/usb/dvb-usb/dvb-usb.h | 5 +++++
drivers/media/usb/dvb-usb/dvb-usb-init.c | 6 ++++++
2 files changed, 11 insertions(+)
diff --git a/drivers/media/usb/dvb-usb/dvb-usb.h
b/drivers/media/usb/dvb-usb/dvb-usb.h
index aab0f99..1fcea68 100644
--- a/drivers/media/usb/dvb-usb/dvb-usb.h
+++ b/drivers/media/usb/dvb-usb/dvb-usb.h
@@ -233,6 +233,9 @@ enum dvb_usb_mode {
* @size_of_priv: how many bytes shall be allocated for the private field
* of struct dvb_usb_device.
*
+ * @pre_init: function executed after i2c initialization but
+ * before the adapters get initialized
+ *
* @power_ctrl: called to enable/disable power of the device.
* @read_mac_address: called to read the MAC address of the device.
* @identify_state: called to determine the state (cold or warm), when it
@@ -274,6 +277,8 @@ struct dvb_usb_device_properties {
int size_of_priv;
+ int (*pre_init) (struct dvb_usb_device *);
+
int num_adapters;
struct dvb_usb_adapter_properties adapter[MAX_NO_OF_ADAPTER_PER_DEVICE];
diff --git a/drivers/media/usb/dvb-usb/dvb-usb-init.c
b/drivers/media/usb/dvb-usb/dvb-usb-init.c
index 169196e..8ab916e 100644
--- a/drivers/media/usb/dvb-usb/dvb-usb-init.c
+++ b/drivers/media/usb/dvb-usb/dvb-usb-init.c
@@ -31,6 +31,12 @@ static int dvb_usb_adapter_init(struct dvb_usb_device *d,
short *adapter_nrs)
struct dvb_usb_adapter *adap;
int ret, n, o;
+ if (d->props.pre_init) {
+ ret = d->props.pre_init(d);
+ if (ret < 0)
+ return ret;
+ }
+
for (n = 0; n < d->props.num_adapters; n++) {
adap = &d->adapter[n];
adap->dev = d;
--
1.7.10.4
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