Am 2013-11-27 14:09, schrieb Lee Jones:
> <snip>
>
>> static int __remove_subdev(struct device *dev, void *unused)
>> {
>> platform_device_unregister(to_platform_device(dev));
>> @@ -477,6 +486,7 @@ static int tps6586x_i2c_probe(struct i2c_client *client,
>> {
>> struct tps6586x_platform_data *pdata = dev_get_platdata(&client->dev);
>> struct tps6586x *tps6586x;
>> + const char *name = "";
>
> How much memory space does this guarantee?
>
Well, its just an empty string (so, 1). Actually I could assign NULL
here, since we do have a default in the case later on.
>
>> int ret;
>>
>> if (!pdata && client->dev.of_node)
>> @@ -487,20 +497,39 @@ static int tps6586x_i2c_probe(struct i2c_client
>> *client,
>> return -ENOTSUPP;
>> }
>>
>> + tps6586x = devm_kzalloc(&client->dev, sizeof(*tps6586x), GFP_KERNEL);
>> + if (tps6586x == NULL) {
>
> Can you take this oppotunity to change to:
> if (!tps6586x)
>
>> + dev_err(&client->dev, "memory for tps6586x alloc failed\n");
>
> I'm not keen on -ENOMEM prints, just return -ENOMEM and be done with it.
>
>> + return -ENOMEM;
>> + }
>> +
>> ret = i2c_smbus_read_byte_data(client, TPS6586X_VERSIONCRC);
>
> If you're going to do this, please change 'ret' to 'version'.
>
>> if (ret < 0) {
>> dev_err(&client->dev, "Chip ID read failed: %d\n", ret);
>> return -EIO;
>
> Why are you returning an error here when you have a valid enum of:
> TPS6586X_ANY = -1,
>
Hm, when the device is not answering on that request, the probe method
should fail I would say. This means that the device is missing most
likely. However, I should set the device version to TPS6586X_ANY if I
happen to end up in the default case.
>> }
>>
>> - dev_info(&client->dev, "VERSIONCRC is %02x\n", ret);
>> -
>> - tps6586x = devm_kzalloc(&client->dev, sizeof(*tps6586x), GFP_KERNEL);
>> - if (tps6586x == NULL) {
>> - dev_err(&client->dev, "memory for tps6586x alloc failed\n");
>> - return -ENOMEM;
>> + tps6586x->version = (enum tps6586x_version)ret;
>> + switch (ret) {
>> + case TPS658621A:
>> + name = "TPS658621A";
>> + break;
>> + case TPS658621CD:
>> + name = "TPS658621C/D";
>> + break;
>> + case TPS658623:
>> + name = "TPS658623";
>> + break;
>> + case TPS658643:
>> + name = "TPS658643";
>> + break;
>> + default:
>> + name = "TPS6586X";
>> + break;
>> }
>>
>> + dev_info(&client->dev, "Found %s, VERSIONCRC is %02x\n", name, ret);
>> +
>
> I'd suggest pulling this out of probe() and into a separate subroutine.
>
> <snip>
Since I will alter the version when I end up in the default case in my
next patch, would you still do a separate subroutine? I think its
somewhat heavily coupled to the probe function.
Sorry missing you on the CC, will do next time :-)
--
Stefan
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