From: Dave Penkler Date: Fri, 18 Apr 2025 17:34:27 +0000 (+0200) Subject: staging: gpib: Fix request_system_control in gpio X-Git-Tag: v6.16-rc1~31^2~34 X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=8ba7c33be02ca099470b3acc21f859b3be4d1d61;p=linux.git staging: gpib: Fix request_system_control in gpio The implementation of the bb_request_system_control function confused setting controller-in-charge with becoming system-controller. Remove setting controller-in-charge and add initialization of the control lines for the system-controller role. Fixes: 4cd654f84769 ("staging: gpib: Add gpio bitbang GPIB driver") Tested-by: Dave Penkler Signed-off-by: Dave Penkler Link: https://lore.kernel.org/r/20250418173434.2892-2-dpenkler@gmail.com Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/gpib/gpio/gpib_bitbang.c b/drivers/staging/gpib/gpio/gpib_bitbang.c index 9670522fe36e..29aab72c1f0f 100644 --- a/drivers/staging/gpib/gpio/gpib_bitbang.c +++ b/drivers/staging/gpib/gpio/gpib_bitbang.c @@ -889,9 +889,13 @@ static int bb_request_system_control(struct gpib_board *board, int request_contr if (!request_control) return -EINVAL; - set_bit(CIC_NUM, &board->status); - // drive DAV & EOI false, enable NRFD & NDAC irqs - SET_DIR_WRITE(board->private_data); + gpiod_direction_output(REN, 1); /* user space must enable REN if needed */ + gpiod_direction_output(IFC, 1); /* user space must toggle IFC if needed */ + if (sn7516x) + gpiod_direction_output(DC, 0); /* enable ATN as output on SN75161/2 */ + + gpiod_direction_input(SRQ); + return 0; }