add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/gpio/gpio-max3191x.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * gpio-max3191x.c - GPIO driver for Maxim MAX3191x industrial serializer
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  *
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@@ -27,13 +28,10 @@
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  * https://datasheets.maximintegrated.com/en/ds/MAX31912.pdf
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  * https://datasheets.maximintegrated.com/en/ds/MAX31913.pdf
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  * https://datasheets.maximintegrated.com/en/ds/MAX31953-MAX31963.pdf
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License (version 2) as
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- * published by the Free Software Foundation.
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  */
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 #include <linux/bitmap.h>
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+#include <linux/bitops.h>
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 #include <linux/crc8.h>
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 #include <linux/gpio/consumer.h>
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 #include <linux/gpio/driver.h>
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@@ -97,7 +95,7 @@
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 static int max3191x_get_direction(struct gpio_chip *gpio, unsigned int offset)
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 {
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-	return 1; /* always in */
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+	return GPIO_LINE_DIRECTION_IN; /* always in */
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 }
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 static int max3191x_direction_input(struct gpio_chip *gpio, unsigned int offset)
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@@ -235,16 +233,20 @@
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 				 unsigned long *bits)
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 {
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 	struct max3191x_chip *max3191x = gpiochip_get_data(gpio);
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-	int ret, bit = 0, wordlen = max3191x_wordlen(max3191x);
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+	const unsigned int wordlen = max3191x_wordlen(max3191x);
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+	int ret;
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+	unsigned long bit;
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+	unsigned long gpio_mask;
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+	unsigned long in;
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 	mutex_lock(&max3191x->lock);
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 	ret = max3191x_readout_locked(max3191x);
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 	if (ret)
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 		goto out_unlock;
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-	while ((bit = find_next_bit(mask, gpio->ngpio, bit)) != gpio->ngpio) {
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+	bitmap_zero(bits, gpio->ngpio);
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+	for_each_set_clump8(bit, gpio_mask, mask, gpio->ngpio) {
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 		unsigned int chipnum = bit / MAX3191X_NGPIO;
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-		unsigned long in, shift, index;
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 		if (max3191x_chip_is_faulting(max3191x, chipnum)) {
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 			ret = -EIO;
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@@ -252,12 +254,8 @@
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 		}
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 		in = ((u8 *)max3191x->xfer.rx_buf)[chipnum * wordlen];
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-		shift = round_down(bit % BITS_PER_LONG, MAX3191X_NGPIO);
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-		index = bit / BITS_PER_LONG;
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-		bits[index] &= ~(mask[index] & (0xff << shift));
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-		bits[index] |= mask[index] & (in << shift); /* copy bits */
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-
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-		bit = (chipnum + 1) * MAX3191X_NGPIO; /* go to next chip */
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+		in &= gpio_mask;
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+		bitmap_set_value8(bits, in, bit);
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 	}
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 out_unlock:
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@@ -313,18 +311,21 @@
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 static void gpiod_set_array_single_value_cansleep(unsigned int ndescs,
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 						  struct gpio_desc **desc,
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+						  struct gpio_array *info,
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 						  int value)
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 {
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-	int i, *values;
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+	unsigned long *values;
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-	values = kmalloc_array(ndescs, sizeof(*values), GFP_KERNEL);
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+	values = bitmap_alloc(ndescs, GFP_KERNEL);
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 	if (!values)
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 		return;
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-	for (i = 0; i < ndescs; i++)
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-		values[i] = value;
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+	if (value)
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+		bitmap_fill(values, ndescs);
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+	else
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+		bitmap_zero(values, ndescs);
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-	gpiod_set_array_value_cansleep(ndescs, desc, values);
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+	gpiod_set_array_value_cansleep(ndescs, desc, info, values);
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 	kfree(values);
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 }
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@@ -397,7 +398,8 @@
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 	if (max3191x->modesel_pins)
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 		gpiod_set_array_single_value_cansleep(
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 				 max3191x->modesel_pins->ndescs,
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-				 max3191x->modesel_pins->desc, max3191x->mode);
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+				 max3191x->modesel_pins->desc,
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+				 max3191x->modesel_pins->info, max3191x->mode);
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 	max3191x->ignore_uv = device_property_read_bool(dev,
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 						  "maxim,ignore-undervoltage");