add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/gpio/gpio-pisosr.c
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@@ -65,7 +65,7 @@
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 				     unsigned offset)
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 {
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 	/* This device always input */
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-	return 1;
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+	return GPIO_LINE_DIRECTION_IN;
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 }
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 static int pisosr_gpio_direction_input(struct gpio_chip *chip,
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@@ -96,16 +96,16 @@
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 				    unsigned long *mask, unsigned long *bits)
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 {
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 	struct pisosr_gpio *gpio = gpiochip_get_data(chip);
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-	unsigned int nbytes = DIV_ROUND_UP(chip->ngpio, 8);
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-	unsigned int i, j;
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+	unsigned long offset;
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+	unsigned long gpio_mask;
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+	unsigned long buffer_state;
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 	pisosr_gpio_refresh(gpio);
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 	bitmap_zero(bits, chip->ngpio);
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-	for (i = 0; i < nbytes; i++) {
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-		j = i / sizeof(unsigned long);
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-		bits[j] |= ((unsigned long) gpio->buffer[i])
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-			   << (8 * (i % sizeof(unsigned long)));
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+	for_each_set_clump8(offset, gpio_mask, mask, chip->ngpio) {
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+		buffer_state = gpio->buffer[offset / 8] & gpio_mask;
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+		bitmap_set_value8(bits, buffer_state, offset);
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 	}
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 	return 0;
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@@ -148,12 +148,9 @@
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 		return -ENOMEM;
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 	gpio->load_gpio = devm_gpiod_get_optional(dev, "load", GPIOD_OUT_LOW);
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-	if (IS_ERR(gpio->load_gpio)) {
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-		ret = PTR_ERR(gpio->load_gpio);
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-		if (ret != -EPROBE_DEFER)
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-			dev_err(dev, "Unable to allocate load GPIO\n");
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-		return ret;
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-	}
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+	if (IS_ERR(gpio->load_gpio))
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+		return dev_err_probe(dev, PTR_ERR(gpio->load_gpio),
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+				     "Unable to allocate load GPIO\n");
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 	mutex_init(&gpio->lock);
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