[PATCH v3 4/8] gpio: mockup: improve readability

Bartosz Golaszewski
2017-06-09T11:41:49Z

We currently shift bits here and there without actually explaining
what we're doing. Add some helper variables with names indicating
their purpose to improve the code readability.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
---
drivers/gpio/gpio-mockup.c | 20 +++++++++++++-------
1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c
index d95d37a..0cb6cba 100644
--- a/drivers/gpio/gpio-mockup.c
+++ b/drivers/gpio/gpio-mockup.c
@@ -27,6 +27,11 @@

#define GPIO_MOCKUP_NAME "gpio-mockup"
#define GPIO_MOCKUP_MAX_GC 10
+/*
+ * We're storing two values per chip: the GPIO base and the number
+ * of GPIO lines.
+ */
+#define GPIO_MOCKUP_MAX_RANGES (GPIO_MOCKUP_MAX_GC * 2)

enum {
GPIO_MOCKUP_DIR_OUT = 0,
@@ -62,7 +67,7 @@ struct gpio_mockup_dbgfs_private {
int offset;
};

-static int gpio_mockup_ranges[GPIO_MOCKUP_MAX_GC << 1];
+static int gpio_mockup_ranges[GPIO_MOCKUP_MAX_RANGES];
static int gpio_mockup_params_nr;
module_param_array(gpio_mockup_ranges, int, &gpio_mockup_params_nr, 0400);

@@ -329,23 +334,24 @@ static int gpio_mockup_add(struct device *dev,

static int gpio_mockup_probe(struct platform_device *pdev)
{
- struct gpio_mockup_chip *chips;
+ int ret, i, base, ngpio, num_chips;
struct device *dev = &pdev->dev;
- int ret, i, base, ngpio;
+ struct gpio_mockup_chip *chips;
char *chip_name;

if (gpio_mockup_params_nr < 2 || (gpio_mockup_params_nr % 2))
return -EINVAL;

- chips = devm_kzalloc(dev,
- sizeof(*chips) * (gpio_mockup_params_nr >> 1),
- GFP_KERNEL);
+ /* Each chip is described by two values. */
+ num_chips = gpio_mockup_params_nr / 2;
+
+ chips = devm_kzalloc(dev, sizeof(*chips) * num_chips, GFP_KERNEL);
if (!chips)
return -ENOMEM;

platform_set_drvdata(pdev, chips);

- for (i = 0; i < gpio_mockup_params_nr >> 1; i++) {
+ for (i = 0; i < num_chips; i++) {
base = gpio_mockup_ranges[i * 2];

if (base == -1)
--
2.9.3