Re: [PATCH 12/14] HID: hidraw: replace hid_output_raw_report() calls by appropriates ones

From: David Herrmann
Date: Wed Feb 12 2014 - 05:49:59 EST


Hi

On Mon, Feb 10, 2014 at 6:58 PM, Benjamin Tissoires
<benjamin.tissoires@xxxxxxxxxx> wrote:
> Remove hid_output_raw_report() call as it is not a ll_driver callbacj,
> and switch to the hid_hw_* implementation. USB-HID used to fallback
> into SET_REPORT when there were no output interrupt endpoint,
> so emulating this if hid_hw_output_report() returns -ENOSYS.
>
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
> ---
> drivers/hid/hidraw.c | 22 +++++++++++++++++-----
> 1 file changed, 17 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c
> index f8708c9..704718b 100644
> --- a/drivers/hid/hidraw.c
> +++ b/drivers/hid/hidraw.c
> @@ -123,10 +123,8 @@ static ssize_t hidraw_send_report(struct file *file, const char __user *buffer,
>
> dev = hidraw_table[minor]->hid;
>
> - if (!dev->hid_output_raw_report) {
> - ret = -ENODEV;
> - goto out;
> - }
> + if (!dev->ll_driver->raw_request || !dev->ll_driver->output_report)
> + return -ENODEV;

You still have a "goto out;" above (not visible in the patch). The
error paths look quite ugly now. I'd prefer consistency here, so
either keep the jump or fix the error-path above, too. Otherwise looks
good.

Reviewed-by: David Herrmann <dh.herrmann@xxxxxxxxx>

Thanks
David

>
> if (count > HID_MAX_BUFFER_SIZE) {
> hid_warn(dev, "pid %d passed too large report\n",
> @@ -153,7 +151,21 @@ static ssize_t hidraw_send_report(struct file *file, const char __user *buffer,
> goto out_free;
> }
>
> - ret = hid_output_raw_report(dev, buf, count, report_type);
> + if (report_type == HID_OUTPUT_REPORT) {
> + ret = hid_hw_output_report(dev, buf, count);
> + /*
> + * compatibility with old implementation of USB-HID and I2C-HID:
> + * if the device does not support receiving output reports,
> + * on an interrupt endpoint, then fallback to the SET_REPORT
> + * HID command.
> + */
> + if (ret != -ENOSYS)
> + goto out_free;
> + }
> +
> + ret = hid_hw_raw_request(dev, buf[0], buf, count, report_type,
> + HID_REQ_SET_REPORT);
> +
> out_free:
> kfree(buf);
> out:
> --
> 1.8.3.1
>
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