diff options
| author |   Geert Uytterhoeven <geert+renesas@glider.be> | 2021-10-04 14:45:45 +0200 |
|---|---|---|
| committer |   Bartosz Golaszewski <brgl@bgdev.pl> | 2021-10-13 16:19:23 +0200 |
| commit | aa4858eb8264358e9c18c3ad79d6ab4fdc71e0c2 (patch) | |
| tree | e5cbe3a8f8a54d9f82d2ba3f7b1bdcab220a678c /drivers/gpio/gpio-aggregator.c | |
| parent | gpio: modepin: Add driver support for modepin GPIO controller (diff) | |
| download | linux-dev-aa4858eb8264358e9c18c3ad79d6ab4fdc71e0c2.tar.xz linux-dev-aa4858eb8264358e9c18c3ad79d6ab4fdc71e0c2.zip | |
gpio: aggregator: Wrap access to gpiochip_fwd.tmp[]
The tmp[] member of the gpiochip_fwd structure is used to store both the
temporary values bitmap and the desc pointers for operations on multiple
GPIOs. As both are arrays with sizes unknown at compile-time, accessing
them requires offset calculations, which are currently duplicated in
gpio_fwd_get_multiple() and gpio_fwd_set_multiple().
Introduce (a) accessors for both arrays and (b) a macro to calculate the
needed storage size. This confines the layout of the tmp[] member into
a single spot, to ease maintenance.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Diffstat (limited to 'drivers/gpio/gpio-aggregator.c')
| -rw-r--r-- | drivers/gpio/gpio-aggregator.c | 25 |
1 files changed, 11 insertions, 14 deletions
diff --git a/drivers/gpio/gpio-aggregator.c b/drivers/gpio/gpio-aggregator.c index 34e35b64dcdc..e9671d1660ef 100644 --- a/drivers/gpio/gpio-aggregator.c +++ b/drivers/gpio/gpio-aggregator.c @@ -247,6 +247,11 @@ struct gpiochip_fwd { unsigned long tmp[]; /* values and descs for multiple ops */ }; +#define fwd_tmp_values(fwd) &(fwd)->tmp[0] +#define fwd_tmp_descs(fwd) (void *)&(fwd)->tmp[BITS_TO_LONGS((fwd)->chip.ngpio)] + +#define fwd_tmp_size(ngpios) (BITS_TO_LONGS((ngpios)) + (ngpios)) + static int gpio_fwd_get_direction(struct gpio_chip *chip, unsigned int offset) { struct gpiochip_fwd *fwd = gpiochip_get_data(chip); @@ -279,15 +284,11 @@ static int gpio_fwd_get(struct gpio_chip *chip, unsigned int offset) static int gpio_fwd_get_multiple(struct gpiochip_fwd *fwd, unsigned long *mask, unsigned long *bits) { - struct gpio_desc **descs; - unsigned long *values; + struct gpio_desc **descs = fwd_tmp_descs(fwd); + unsigned long *values = fwd_tmp_values(fwd); unsigned int i, j = 0; int error; - /* Both values bitmap and desc pointers are stored in tmp[] */ - values = &fwd->tmp[0]; - descs = (void *)&fwd->tmp[BITS_TO_LONGS(fwd->chip.ngpio)]; - bitmap_clear(values, 0, fwd->chip.ngpio); for_each_set_bit(i, mask, fwd->chip.ngpio) descs[j++] = fwd->descs[i]; @@ -333,14 +334,10 @@ static void gpio_fwd_set(struct gpio_chip *chip, unsigned int offset, int value) static void gpio_fwd_set_multiple(struct gpiochip_fwd *fwd, unsigned long *mask, unsigned long *bits) { - struct gpio_desc **descs; - unsigned long *values; + struct gpio_desc **descs = fwd_tmp_descs(fwd); + unsigned long *values = fwd_tmp_values(fwd); unsigned int i, j = 0; - /* Both values bitmap and desc pointers are stored in tmp[] */ - values = &fwd->tmp[0]; - descs = (void *)&fwd->tmp[BITS_TO_LONGS(fwd->chip.ngpio)]; - for_each_set_bit(i, mask, fwd->chip.ngpio) { __assign_bit(j, values, test_bit(i, bits)); descs[j++] = fwd->descs[i]; @@ -398,8 +395,8 @@ static struct gpiochip_fwd *gpiochip_fwd_create(struct device *dev, unsigned int i; int error; - fwd = devm_kzalloc(dev, struct_size(fwd, tmp, - BITS_TO_LONGS(ngpios) + ngpios), GFP_KERNEL); + fwd = devm_kzalloc(dev, struct_size(fwd, tmp, fwd_tmp_size(ngpios)), + GFP_KERNEL); if (!fwd) return ERR_PTR(-ENOMEM); |