Just to make sure the corrected patch is: [RFC v2] [HID] allow using
external Hid Descriptors.
2009/12/24 Antonio Ospite <ospite@xxxxxxxxxxxxxxxxx>:
> On Thu, 24 Dec 2009 02:29:47 +0000
> Marcin Tolysz <tolysz@xxxxxxxxx> wrote:
>
>> Simple but effective way of changing HID device descriptors using
>> firmware loading mechanism.
>> Just place your new descriptor in a location specified by driver
>> i.e. somewhere in /lib/firmware/hid/
>> If it is there it will replace HID descriptor from the device.
>> I do not do any parsing or checking, as it is done by hid driver.
>>
>> Signed-off-by: Marcin Tolysz <tolysz@xxxxxxxxx>
>>
>
> Only some style comments below, I haven't tested the patch. Plus, try
> running the patch through scripts/checkpatch.pl to spot all the other
> style issues.
Corrected most of style errors but 3 too long lines.
>> ---
>> drivers/hid/hid-core.c | 26 +++++++++++++++++++++++++-
>> 1 files changed, 25 insertions(+), 1 deletions(-)
>>
>> diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
>> index 80792d3..5d8d656 100644
>> --- a/drivers/hid/hid-core.c
>> +++ b/drivers/hid/hid-core.c
>> @@ -27,6 +27,7 @@
>> #include <linux/wait.h>
>> #include <linux/vmalloc.h>
>> #include <linux/sched.h>
>> +#include <linux/firmware.h>
>>
>> #include <linux/hid.h>
>> #include <linux/hiddev.h>
>> @@ -640,6 +641,10 @@ int hid_parse_report(struct hid_device *device,
>> __u8 *start,
>> struct hid_item item;
>> __u8 *end;
>> int ret;
>> + const struct firmware *fw;
>> + int succ;
>
> success? Can't you init fw to NULL and derive this info checking
> (fw != NULL) before releasing firmware?
every other driver checks this value, fw is a structure thus I would
need to check fw->data;
>> + char *file;
>> +
>> static int (*dispatch_type[])(struct hid_parser *parser,
>> struct hid_item *item) = {
>> hid_parser_main,
>> @@ -650,10 +655,27 @@ int hid_parse_report(struct hid_device *device,
>> __u8 *start,
>>
>> if (device->driver->report_fixup)
>> device->driver->report_fixup(device, start, size);
>> + /* Now load a hid descriptor from a file firmware
>> + ignoring this fixup thing */
>> + file=kmalloc(29, GFP_KERNEL);
>> +
>> sprintf(file,"hid/%04X:%04X:%04X:%04X.bin",device->bus,device->vendor,device->product,device->version);
>> +
>
> What about removing this 29?
> #define NEW_HID_DESCRIPTOR_PATH_FMT "hid/%04X:%04X:%04X:%04X.bin"
> and use it in kmalloc with strlen and in sprintf.
replaced by:
file = kasprintf(GFP_KERNEL, "hid/%04X:%04X:%04X:%04X.bin",
device->bus, device->vendor, device->product,
device->version);
I did not putted it into define as this heavily depends on parameters,
and I do not want to separate them yet.
>> + succ = request_firmware(&fw, file, &device->dev);
>> +
>> + if (succ)
>> + printk(KERN_INFO "To relace HID descriptor place it in
>> /lib/firmaware/%s\n", file);
>
> pr_info() could be used or maybe even dev_info()
I went for pr_info.
>> + else{
>> + start = fw->data;
>> + size = fw->size;
>> + printk(KERN_INFO "HID descriptor relaced with /lib/firmaware/%s\n",
>> file);
>> + }
>> + kfree(file);
>>
>> device->rdesc = kmalloc(size, GFP_KERNEL);
>> - if (device->rdesc == NULL)
>> + if (device->rdesc == NULL){
>> + if(!succ)release_firmware(fw);
>> return -ENOMEM;
>> + }
>> memcpy(device->rdesc, start, size);
>> device->rsize = size;
>>
>> @@ -690,6 +712,7 @@ int hid_parse_report(struct hid_device *device, __u8
>> *start,
>> dbg_hid("unbalanced delimiter at end of report description\n");
>> goto err;
>> }
>> + if(!succ)release_firmware(fw);
>> vfree(parser);
>> return 0;
>> }
>> @@ -697,6 +720,7 @@ int hid_parse_report(struct hid_device *device, __u8
>> *start,
>>
>> dbg_hid("item fetching failed at offset %d\n", (int)(end - start));
>> err:
>> + if(!succ)release_firmware(fw);
>> vfree(parser);
>> return ret;
>> }
>> -- 1.6.5.7
>
> Regards,
> Antonio
Many thanks for your help.
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