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gpiolib: cdev: refactor gpiohandle_flags_to_desc_flags

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Refactor the mapping from handle flags to desc flags into a helper
function.

The assign_bit is overkill where it is replacing the set_bit cases, as is
rechecking bits known to be clear in some circumstances, but the DRY
simplification more than makes up for any performance degradation,
especially as this is not a hot path.

Signed-off-by: Kent Gibson <warthog618@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
This commit is contained in:
Kent Gibson 2020-07-08 12:15:47 +08:00 committed by Bartosz Golaszewski
parent a18512e3f1
commit c274b58a4b
1 changed files with 19 additions and 41 deletions
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60
drivers/gpio/gpiolib-cdev.c
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@ -106,6 +106,22 @@ static int linehandle_validate_flags(u32 flags)
return 0;
}
static void linehandle_flags_to_desc_flags(u32 lflags, unsigned long *flagsp)
{
assign_bit(FLAG_ACTIVE_LOW, flagsp,
lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW);
assign_bit(FLAG_OPEN_DRAIN, flagsp,
lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN);
assign_bit(FLAG_OPEN_SOURCE, flagsp,
lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE);
assign_bit(FLAG_PULL_UP, flagsp,
lflags & GPIOHANDLE_REQUEST_BIAS_PULL_UP);
assign_bit(FLAG_PULL_DOWN, flagsp,
lflags & GPIOHANDLE_REQUEST_BIAS_PULL_DOWN);
assign_bit(FLAG_BIAS_DISABLE, flagsp,
lflags & GPIOHANDLE_REQUEST_BIAS_DISABLE);
}
static long linehandle_set_config(struct linehandle_state *lh,
void __user *ip)
{
@ -113,7 +129,6 @@ static long linehandle_set_config(struct linehandle_state *lh,
struct gpio_desc *desc;
int i, ret;
u32 lflags;
unsigned long *flagsp;
if (copy_from_user(&gcnf, ip, sizeof(gcnf)))
return -EFAULT;
@ -125,25 +140,7 @@ static long linehandle_set_config(struct linehandle_state *lh,
for (i = 0; i < lh->numdescs; i++) {
desc = lh->descs[i];
flagsp = &desc->flags;
assign_bit(FLAG_ACTIVE_LOW, flagsp,
lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW);
assign_bit(FLAG_OPEN_DRAIN, flagsp,
lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN);
assign_bit(FLAG_OPEN_SOURCE, flagsp,
lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE);
assign_bit(FLAG_PULL_UP, flagsp,
lflags & GPIOHANDLE_REQUEST_BIAS_PULL_UP);
assign_bit(FLAG_PULL_DOWN, flagsp,
lflags & GPIOHANDLE_REQUEST_BIAS_PULL_DOWN);
assign_bit(FLAG_BIAS_DISABLE, flagsp,
lflags & GPIOHANDLE_REQUEST_BIAS_DISABLE);
linehandle_flags_to_desc_flags(gcnf.flags, &desc->flags);
/*
* Lines have to be requested explicitly for input
@ -306,19 +303,7 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip)
goto out_free_descs;
lh->descs[i] = desc;
count = i + 1;
if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW)
set_bit(FLAG_ACTIVE_LOW, &desc->flags);
if (lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN)
set_bit(FLAG_OPEN_DRAIN, &desc->flags);
if (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE)
set_bit(FLAG_OPEN_SOURCE, &desc->flags);
if (lflags & GPIOHANDLE_REQUEST_BIAS_DISABLE)
set_bit(FLAG_BIAS_DISABLE, &desc->flags);
if (lflags & GPIOHANDLE_REQUEST_BIAS_PULL_DOWN)
set_bit(FLAG_PULL_DOWN, &desc->flags);
if (lflags & GPIOHANDLE_REQUEST_BIAS_PULL_UP)
set_bit(FLAG_PULL_UP, &desc->flags);
linehandle_flags_to_desc_flags(handlereq.flags, &desc->flags);
ret = gpiod_set_transitory(desc, false);
if (ret < 0)
@ -685,14 +670,7 @@ static int lineevent_create(struct gpio_device *gdev, void __user *ip)
le->desc = desc;
le->eflags = eflags;
if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW)
set_bit(FLAG_ACTIVE_LOW, &desc->flags);
if (lflags & GPIOHANDLE_REQUEST_BIAS_DISABLE)
set_bit(FLAG_BIAS_DISABLE, &desc->flags);
if (lflags & GPIOHANDLE_REQUEST_BIAS_PULL_DOWN)
set_bit(FLAG_PULL_DOWN, &desc->flags);
if (lflags & GPIOHANDLE_REQUEST_BIAS_PULL_UP)
set_bit(FLAG_PULL_UP, &desc->flags);
linehandle_flags_to_desc_flags(lflags, &desc->flags);
ret = gpiod_direction_input(desc);
if (ret)