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Subject: media: ngene: check for CXD2099AR presence before attaching
Author: Daniel Scheller <d.schel...@gmx.net>
Date: Sun Feb 25 07:31:37 2018 -0500
Currently, if there's no CXD2099AR attached to any expansion connector of
the ngene hardware, it will complain with this on every module load:
cxd2099 1-0040: No CXD2099AR detected at 0x40
cxd2099: probe of 1-0040 failed with error -5
ngene 0000:02:00.0: CXD2099AR attach failed
This happens due to the logic assuming such hardware is always there and
blindly tries to attach the cxd2099 I2C driver. Rather add a probe
function (in ngene-cards.c with a prototype in ngene.h) to check for
the existence of such hardware before probing, and don't try further if
no CXD2099 was found.
Signed-off-by: Daniel Scheller <d.schel...@gmx.net>
Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>
drivers/media/pci/ngene/ngene-cards.c | 19 +++++++++++++++++++
drivers/media/pci/ngene/ngene-core.c | 14 ++++++++++++++
drivers/media/pci/ngene/ngene.h | 3 +++
3 files changed, 36 insertions(+)
---
diff --git a/drivers/media/pci/ngene/ngene-cards.c
b/drivers/media/pci/ngene/ngene-cards.c
index dff55c7c9f86..d603d0af703e 100644
--- a/drivers/media/pci/ngene/ngene-cards.c
+++ b/drivers/media/pci/ngene/ngene-cards.c
@@ -505,6 +505,25 @@ static int port_has_stv0367(struct i2c_adapter *i2c)
return 1;
}
+int ngene_port_has_cxd2099(struct i2c_adapter *i2c, u8 *type)
+{
+ u8 val;
+ u8 probe[4] = { 0xe0, 0x00, 0x00, 0x00 }, data[4];
+ struct i2c_msg msgs[2] = {{ .addr = 0x40, .flags = 0,
+ .buf = probe, .len = 4 },
+ { .addr = 0x40, .flags = I2C_M_RD,
+ .buf = data, .len = 4 } };
+ val = i2c_transfer(i2c, msgs, 2);
+ if (val != 2)
+ return 0;
+
+ if (data[0] == 0x02 && data[1] == 0x2b && data[3] == 0x43)
+ *type = 2;
+ else
+ *type = 1;
+ return 1;
+}
+
static int demod_attach_drxk(struct ngene_channel *chan,
struct i2c_adapter *i2c)
{
diff --git a/drivers/media/pci/ngene/ngene-core.c
b/drivers/media/pci/ngene/ngene-core.c
index 526d0adfa427..f69a8fc1ec2a 100644
--- a/drivers/media/pci/ngene/ngene-core.c
+++ b/drivers/media/pci/ngene/ngene-core.c
@@ -1589,6 +1589,20 @@ static void cxd_attach(struct ngene *dev)
.addr = 0x40,
.platform_data = &cxd_cfg,
};
+ int ret;
+ u8 type;
+
+ /* check for CXD2099AR presence before attaching */
+ ret = ngene_port_has_cxd2099(&dev->channel[0].i2c_adapter, &type);
+ if (!ret) {
+ dev_dbg(pdev, "No CXD2099AR found\n");
+ return;
+ }
+
+ if (type != 1) {
+ dev_warn(pdev, "CXD2099AR is uninitialized!\n");
+ return;
+ }
cxd_cfg.en = &ci->en;
diff --git a/drivers/media/pci/ngene/ngene.h b/drivers/media/pci/ngene/ngene.h
index 72195f6552b3..66d8eaa28549 100644
--- a/drivers/media/pci/ngene/ngene.h
+++ b/drivers/media/pci/ngene/ngene.h
@@ -909,6 +909,9 @@ int ngene_command_gpio_set(struct ngene *dev, u8 select, u8
level);
void set_transfer(struct ngene_channel *chan, int state);
void FillTSBuffer(void *Buffer, int Length, u32 Flags);
+/* Provided by ngene-cards.c */
+int ngene_port_has_cxd2099(struct i2c_adapter *i2c, u8 *type);
+
/* Provided by ngene-i2c.c */
int ngene_i2c_init(struct ngene *dev, int dev_nr);
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