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SubjectRe: [PATCH] HID: sony: Enable Gasia third-party PS3 controllers
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On Sat, 2015-02-07 at 15:48 +0200, Lauri Kasanen wrote:
> Without this, my "Gasia Co.,Ltd PS(R) Gamepad" would not send
> any events. Now everything works including the leds.
>
> Based on work by Andrew Haines and Antonio Ospite.
>
> cc: Antonio Ospite <ao2@ao2.it>
> cc: Andrew Haines <AndrewD207@aol.com>
> Signed-off-by: Lauri Kasanen <cand@gmx.com>
> ---
> drivers/hid/hid-sony.c | 26 ++++++++++++++++++++++++--
> 1 file changed, 24 insertions(+), 2 deletions(-)
>
> Antonio's original approach was not enough; it enabled the events,
> but only for a few seconds, then the controller timed out and sent
> no more. Andrew's did more than was necessary. This is a combination
> of the two, against Linus' git.
>
> diff --git a/drivers/hid/hid-sony.c b/drivers/hid/hid-sony.c
> index 31e9d25..de93386 100644
> --- a/drivers/hid/hid-sony.c
> +++ b/drivers/hid/hid-sony.c
> @@ -36,6 +36,7 @@
> #include <linux/list.h>
> #include <linux/idr.h>
> #include <linux/input/mt.h>
> +#include <linux/usb/input.h>
>
> #include "hid-ids.h"
>
> @@ -1130,8 +1131,12 @@ static void sony_input_configured(struct hid_device *hdev,
> */
> static int sixaxis_set_operational_usb(struct hid_device *hdev)
> {
> + struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
> + struct usb_device *dev = interface_to_usbdev(intf);
> int ret;
> - char *buf = kmalloc(18, GFP_KERNEL);
> + char *buf = kmalloc(65, GFP_KERNEL);
> + unsigned char buf2[] = { 0x00 };
> + int transfered;
>
> if (!buf)
> return -ENOMEM;
> @@ -1140,7 +1145,24 @@ static int sixaxis_set_operational_usb(struct hid_device *hdev)
> HID_REQ_GET_REPORT);
>
> if (ret < 0)
> - hid_err(hdev, "can't set operational mode\n");
> + hid_err(hdev, "can't set operational mode on the control EP\n");
> +
> + /*
> + * Some compatible controllers like the Speedlink Strike FX and
> + * Gasia need another query plus an USB interrupt to get operational.
> + */
> + ret = hid_hw_raw_request(hdev, 0xf5, buf, 64, HID_FEATURE_REPORT,
> + HID_REQ_GET_REPORT);
> +
> + if (ret < 0)
> + hid_err(hdev, "can't set operational mode on the interrupt EP\n");
> +
> + ret = usb_interrupt_msg(dev, usb_sndintpipe(dev, 0x02),
> + buf2, sizeof(buf2),
> + &transfered, USB_CTRL_SET_TIMEOUT);

You cannot do this. Even for a single byte DMA on the stack is
wrong. Not on all architectures it works at all and you violate
the DMA constrainsts. You must use kmalloc().

Regards
Oliver




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