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Conflicts: kernel/stop_machine.c Signed-off-by: Ingo Molnar <[email protected]>
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@@ -47,6 +47,30 @@ Who: Mauro Carvalho Chehab <[email protected]> | |
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--------------------------- | ||
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What: old tuner-3036 i2c driver | ||
When: 2.6.28 | ||
Why: This driver is for VERY old i2c-over-parallel port teletext receiver | ||
boxes. Rather then spending effort on converting this driver to V4L2, | ||
and since it is extremely unlikely that anyone still uses one of these | ||
devices, it was decided to drop it. | ||
Who: Hans Verkuil <[email protected]> | ||
Mauro Carvalho Chehab <[email protected]> | ||
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--------------------------- | ||
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What: V4L2 dpc7146 driver | ||
When: 2.6.28 | ||
Why: Old driver for the dpc7146 demonstration board that is no longer | ||
relevant. The last time this was tested on actual hardware was | ||
probably around 2002. Since this is a driver for a demonstration | ||
board the decision was made to remove it rather than spending a | ||
lot of effort continually updating this driver to stay in sync | ||
with the latest internal V4L2 or I2C API. | ||
Who: Hans Verkuil <[email protected]> | ||
Mauro Carvalho Chehab <[email protected]> | ||
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--------------------------- | ||
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What: PCMCIA control ioctl (needed for pcmcia-cs [cardmgr, cardctl]) | ||
When: November 2005 | ||
Files: drivers/pcmcia/: pcmcia_ioctl.c | ||
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Upgrading I2C Drivers to the new 2.6 Driver Model | ||
================================================= | ||
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Ben Dooks <[email protected]> | ||
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Introduction | ||
------------ | ||
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This guide outlines how to alter existing Linux 2.6 client drivers from | ||
the old to the new new binding methods. | ||
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Example old-style driver | ||
------------------------ | ||
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struct example_state { | ||
struct i2c_client client; | ||
.... | ||
}; | ||
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static struct i2c_driver example_driver; | ||
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static unsigned short ignore[] = { I2C_CLIENT_END }; | ||
static unsigned short normal_addr[] = { OUR_ADDR, I2C_CLIENT_END }; | ||
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I2C_CLIENT_INSMOD; | ||
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static int example_attach(struct i2c_adapter *adap, int addr, int kind) | ||
{ | ||
struct example_state *state; | ||
struct device *dev = &adap->dev; /* to use for dev_ reports */ | ||
int ret; | ||
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state = kzalloc(sizeof(struct example_state), GFP_KERNEL); | ||
if (state == NULL) { | ||
dev_err(dev, "failed to create our state\n"); | ||
return -ENOMEM; | ||
} | ||
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example->client.addr = addr; | ||
example->client.flags = 0; | ||
example->client.adapter = adap; | ||
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i2c_set_clientdata(&state->i2c_client, state); | ||
strlcpy(client->i2c_client.name, "example", I2C_NAME_SIZE); | ||
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ret = i2c_attach_client(&state->i2c_client); | ||
if (ret < 0) { | ||
dev_err(dev, "failed to attach client\n"); | ||
kfree(state); | ||
return ret; | ||
} | ||
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dev = &state->i2c_client.dev; | ||
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/* rest of the initialisation goes here. */ | ||
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dev_info(dev, "example client created\n"); | ||
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return 0; | ||
} | ||
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static int __devexit example_detach(struct i2c_client *client) | ||
{ | ||
struct example_state *state = i2c_get_clientdata(client); | ||
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i2c_detach_client(client); | ||
kfree(state); | ||
return 0; | ||
} | ||
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static int example_attach_adapter(struct i2c_adapter *adap) | ||
{ | ||
return i2c_probe(adap, &addr_data, example_attach); | ||
} | ||
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static struct i2c_driver example_driver = { | ||
.driver = { | ||
.owner = THIS_MODULE, | ||
.name = "example", | ||
}, | ||
.attach_adapter = example_attach_adapter, | ||
.detach_client = __devexit_p(example_detach), | ||
.suspend = example_suspend, | ||
.resume = example_resume, | ||
}; | ||
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Updating the client | ||
------------------- | ||
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The new style binding model will check against a list of supported | ||
devices and their associated address supplied by the code registering | ||
the busses. This means that the driver .attach_adapter and | ||
.detach_adapter methods can be removed, along with the addr_data, | ||
as follows: | ||
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- static struct i2c_driver example_driver; | ||
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- static unsigned short ignore[] = { I2C_CLIENT_END }; | ||
- static unsigned short normal_addr[] = { OUR_ADDR, I2C_CLIENT_END }; | ||
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- I2C_CLIENT_INSMOD; | ||
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- static int example_attach_adapter(struct i2c_adapter *adap) | ||
- { | ||
- return i2c_probe(adap, &addr_data, example_attach); | ||
- } | ||
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static struct i2c_driver example_driver = { | ||
- .attach_adapter = example_attach_adapter, | ||
- .detach_client = __devexit_p(example_detach), | ||
} | ||
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Add the probe and remove methods to the i2c_driver, as so: | ||
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static struct i2c_driver example_driver = { | ||
+ .probe = example_probe, | ||
+ .remove = __devexit_p(example_remove), | ||
} | ||
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Change the example_attach method to accept the new parameters | ||
which include the i2c_client that it will be working with: | ||
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- static int example_attach(struct i2c_adapter *adap, int addr, int kind) | ||
+ static int example_probe(struct i2c_client *client, | ||
+ const struct i2c_device_id *id) | ||
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Change the name of example_attach to example_probe to align it with the | ||
i2c_driver entry names. The rest of the probe routine will now need to be | ||
changed as the i2c_client has already been setup for use. | ||
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The necessary client fields have already been setup before | ||
the probe function is called, so the following client setup | ||
can be removed: | ||
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- example->client.addr = addr; | ||
- example->client.flags = 0; | ||
- example->client.adapter = adap; | ||
- | ||
- strlcpy(client->i2c_client.name, "example", I2C_NAME_SIZE); | ||
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The i2c_set_clientdata is now: | ||
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- i2c_set_clientdata(&state->client, state); | ||
+ i2c_set_clientdata(client, state); | ||
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The call to i2c_attach_client is no longer needed, if the probe | ||
routine exits successfully, then the driver will be automatically | ||
attached by the core. Change the probe routine as so: | ||
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- ret = i2c_attach_client(&state->i2c_client); | ||
- if (ret < 0) { | ||
- dev_err(dev, "failed to attach client\n"); | ||
- kfree(state); | ||
- return ret; | ||
- } | ||
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Remove the storage of 'struct i2c_client' from the 'struct example_state' | ||
as we are provided with the i2c_client in our example_probe. Instead we | ||
store a pointer to it for when it is needed. | ||
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struct example_state { | ||
- struct i2c_client client; | ||
+ struct i2c_client *client; | ||
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the new i2c client as so: | ||
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- struct device *dev = &adap->dev; /* to use for dev_ reports */ | ||
+ struct device *dev = &i2c_client->dev; /* to use for dev_ reports */ | ||
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And remove the change after our client is attached, as the driver no | ||
longer needs to register a new client structure with the core: | ||
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- dev = &state->i2c_client.dev; | ||
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In the probe routine, ensure that the new state has the client stored | ||
in it: | ||
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static int example_probe(struct i2c_client *i2c_client, | ||
const struct i2c_device_id *id) | ||
{ | ||
struct example_state *state; | ||
struct device *dev = &i2c_client->dev; | ||
int ret; | ||
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state = kzalloc(sizeof(struct example_state), GFP_KERNEL); | ||
if (state == NULL) { | ||
dev_err(dev, "failed to create our state\n"); | ||
return -ENOMEM; | ||
} | ||
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+ state->client = i2c_client; | ||
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Update the detach method, by changing the name to _remove and | ||
to delete the i2c_detach_client call. It is possible that you | ||
can also remove the ret variable as it is not not needed for | ||
any of the core functions. | ||
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- static int __devexit example_detach(struct i2c_client *client) | ||
+ static int __devexit example_remove(struct i2c_client *client) | ||
{ | ||
struct example_state *state = i2c_get_clientdata(client); | ||
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- i2c_detach_client(client); | ||
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And finally ensure that we have the correct ID table for the i2c-core | ||
and other utilities: | ||
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+ struct i2c_device_id example_idtable[] = { | ||
+ { "example", 0 }, | ||
+ { } | ||
+}; | ||
+ | ||
+MODULE_DEVICE_TABLE(i2c, example_idtable); | ||
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static struct i2c_driver example_driver = { | ||
.driver = { | ||
.owner = THIS_MODULE, | ||
.name = "example", | ||
}, | ||
+ .id_table = example_ids, | ||
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Our driver should now look like this: | ||
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struct example_state { | ||
struct i2c_client *client; | ||
.... | ||
}; | ||
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static int example_probe(struct i2c_client *client, | ||
const struct i2c_device_id *id) | ||
{ | ||
struct example_state *state; | ||
struct device *dev = &client->dev; | ||
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state = kzalloc(sizeof(struct example_state), GFP_KERNEL); | ||
if (state == NULL) { | ||
dev_err(dev, "failed to create our state\n"); | ||
return -ENOMEM; | ||
} | ||
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state->client = client; | ||
i2c_set_clientdata(client, state); | ||
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/* rest of the initialisation goes here. */ | ||
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dev_info(dev, "example client created\n"); | ||
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return 0; | ||
} | ||
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static int __devexit example_remove(struct i2c_client *client) | ||
{ | ||
struct example_state *state = i2c_get_clientdata(client); | ||
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kfree(state); | ||
return 0; | ||
} | ||
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static struct i2c_device_id example_idtable[] = { | ||
{ "example", 0 }, | ||
{ } | ||
}; | ||
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MODULE_DEVICE_TABLE(i2c, example_idtable); | ||
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static struct i2c_driver example_driver = { | ||
.driver = { | ||
.owner = THIS_MODULE, | ||
.name = "example", | ||
}, | ||
.id_table = example_idtable, | ||
.probe = example_probe, | ||
.remove = __devexit_p(example_remove), | ||
.suspend = example_suspend, | ||
.resume = example_resume, | ||
}; |
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