From 4eec8772e4f501b719df5264fc345b37a9af3c68 Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Thu, 13 Nov 2025 16:44:44 +0100 Subject: [PATCH] Input: gpio_decoder - replace custom loop by gpiod_get_array_value_cansleep() There is a custom loop that repeats parts of gpiod_get_array_value_cansleep(). Use that in conjunction with bitmap API to make code shorter and easier to follow. With this done, add an upper check for amount of GPIOs given based on the driver's code. Signed-off-by: Andy Shevchenko Link: https://patch.msgid.link/20251113154616.3107676-4-andriy.shevchenko@linux.intel.com Signed-off-by: Dmitry Torokhov --- drivers/input/misc/gpio_decoder.c | 30 +++++++++++++++--------------- 1 file changed, 15 insertions(+), 15 deletions(-) diff --git a/drivers/input/misc/gpio_decoder.c b/drivers/input/misc/gpio_decoder.c index a2ae400790f9..7f319b932550 100644 --- a/drivers/input/misc/gpio_decoder.c +++ b/drivers/input/misc/gpio_decoder.c @@ -6,11 +6,13 @@ * encoded numeric value into an input event. */ +#include #include #include #include #include #include +#include #include #include #include @@ -26,23 +28,18 @@ struct gpio_decoder { static int gpio_decoder_get_gpios_state(struct gpio_decoder *decoder) { struct gpio_descs *gpios = decoder->input_gpios; - unsigned int ret = 0; - int i, val; - - for (i = 0; i < gpios->ndescs; i++) { - val = gpiod_get_value_cansleep(gpios->desc[i]); - if (val < 0) { - dev_err(decoder->dev, - "Error reading gpio %d: %d\n", - desc_to_gpio(gpios->desc[i]), val); - return val; - } - - val = !!val; - ret = (ret << 1) | val; + DECLARE_BITMAP(values, 32); + unsigned int size; + int err; + + size = min(gpios->ndescs, 32U); + err = gpiod_get_array_value_cansleep(size, gpios->desc, gpios->info, values); + if (err) { + dev_err(decoder->dev, "Error reading GPIO: %d\n", err); + return err; } - return ret; + return bitmap_read(values, 0, size); } static void gpio_decoder_poll_gpios(struct input_dev *input) @@ -81,6 +78,9 @@ static int gpio_decoder_probe(struct platform_device *pdev) if (decoder->input_gpios->ndescs < 2) return dev_err_probe(dev, -EINVAL, "not enough gpios found\n"); + if (decoder->input_gpios->ndescs > 31) + return dev_err_probe(dev, -EINVAL, "too many gpios found\n"); + if (device_property_read_u32(dev, "decoder-max-value", &max)) max = (1U << decoder->input_gpios->ndescs) - 1; -- 2.47.3