--- zzzz-none-000/linux-3.10.107/drivers/gpio/gpiolib.c	2017-06-27 09:49:32.000000000 +0000
+++ vr9-7490-729/linux-3.10.107/drivers/gpio/gpiolib.c	2021-11-10 11:53:55.000000000 +0000
@@ -60,6 +60,7 @@
 #define FLAG_ACTIVE_LOW	6	/* sysfs value has active low */
 #define FLAG_OPEN_DRAIN	7	/* Gpio is open drain type */
 #define FLAG_OPEN_SOURCE 8	/* Gpio is open source type */
+#define FLAG_USED_AS_IRQ 9	/* GPIO is connected to an IRQ */
 
 #define ID_SHIFT	16	/* add new flags before this one */
 
@@ -102,6 +103,56 @@
 static int gpiod_sysfs_set_active_low(struct gpio_desc *desc, int value);
 static void gpiod_unexport(struct gpio_desc *desc);
 
+/* With descriptor prefix */
+
+#ifdef CONFIG_DEBUG_FS
+#define gpiod_emerg(desc, fmt, ...)					       \
+	pr_emerg("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\
+                 ##__VA_ARGS__)
+#define gpiod_crit(desc, fmt, ...)					       \
+	pr_crit("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
+                 ##__VA_ARGS__)
+#define gpiod_err(desc, fmt, ...)					       \
+	pr_err("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",  \
+                 ##__VA_ARGS__)
+#define gpiod_warn(desc, fmt, ...)					       \
+	pr_warn("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
+                 ##__VA_ARGS__)
+#define gpiod_info(desc, fmt, ...)					       \
+	pr_info("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
+                ##__VA_ARGS__)
+#define gpiod_dbg(desc, fmt, ...)					       \
+	pr_debug("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\
+                 ##__VA_ARGS__)
+#else
+#define gpiod_emerg(desc, fmt, ...)					\
+	pr_emerg("gpio-%d: " fmt, desc_to_gpio(desc), ##__VA_ARGS__)
+#define gpiod_crit(desc, fmt, ...)					\
+	pr_crit("gpio-%d: " fmt, desc_to_gpio(desc), ##__VA_ARGS__)
+#define gpiod_err(desc, fmt, ...)					\
+	pr_err("gpio-%d: " fmt, desc_to_gpio(desc), ##__VA_ARGS__)
+#define gpiod_warn(desc, fmt, ...)					\
+	pr_warn("gpio-%d: " fmt, desc_to_gpio(desc), ##__VA_ARGS__)
+#define gpiod_info(desc, fmt, ...)					\
+	pr_info("gpio-%d: " fmt, desc_to_gpio(desc), ##__VA_ARGS__)
+#define gpiod_dbg(desc, fmt, ...)					\
+	pr_debug("gpio-%d: " fmt, desc_to_gpio(desc), ##__VA_ARGS__)
+#endif
+
+/* With chip prefix */
+
+#define chip_emerg(chip, fmt, ...)					\
+	pr_emerg("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
+#define chip_crit(chip, fmt, ...)					\
+	pr_crit("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
+#define chip_err(chip, fmt, ...)					\
+	pr_err("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
+#define chip_warn(chip, fmt, ...)					\
+	pr_warn("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
+#define chip_info(chip, fmt, ...)					\
+	pr_info("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
+#define chip_dbg(chip, fmt, ...)					\
+	pr_debug("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
 
 static inline void desc_set_label(struct gpio_desc *d, const char *label)
 {
@@ -130,6 +181,18 @@
 }
 
 /**
+ * Convert an offset on a certain chip to a corresponding descriptor
+ */
+static struct gpio_desc *gpiochip_offset_to_desc(struct gpio_chip *chip,
+						 unsigned int offset)
+{
+	if (offset >= chip->ngpio)
+		return ERR_PTR(-EINVAL);
+
+	return &chip->desc[offset];
+}
+
+/**
  * Convert a GPIO descriptor to the integer namespace.
  * This should disappear in the future but is needed since we still
  * use GPIO numbers for error messages and sysfs nodes
@@ -2019,6 +2082,61 @@
 }
 EXPORT_SYMBOL_GPL(__gpio_to_irq);
 
+/**
+ * gpiod_lock_as_irq() - lock a GPIO to be used as IRQ
+ * @gpio: the GPIO line to lock as used for IRQ
+ *
+ * This is used directly by GPIO drivers that want to lock down
+ * a certain GPIO line to be used as IRQs, for example in the
+ * .to_irq() callback of their gpio_chip, or in the .irq_enable()
+ * of its irq_chip implementation if the GPIO is known from that
+ * code.
+ */
+int gpiod_lock_as_irq(struct gpio_desc *desc)
+{
+	if (!desc)
+		return -EINVAL;
+
+	if (test_bit(FLAG_IS_OUT, &desc->flags)) {
+		gpiod_err(desc,
+			  "%s: tried to flag a GPIO set as output for IRQ\n",
+			  __func__);
+		return -EIO;
+	}
+
+	set_bit(FLAG_USED_AS_IRQ, &desc->flags);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(gpiod_lock_as_irq);
+
+int gpio_lock_as_irq(struct gpio_chip *chip, unsigned int offset)
+{
+	return gpiod_lock_as_irq(gpiochip_offset_to_desc(chip, offset));
+}
+EXPORT_SYMBOL_GPL(gpio_lock_as_irq);
+
+/**
+ * gpiod_unlock_as_irq() - unlock a GPIO used as IRQ
+ * @gpio: the GPIO line to unlock from IRQ usage
+ *
+ * This is used directly by GPIO drivers that want to indicate
+ * that a certain GPIO is no longer used exclusively for IRQ.
+ */
+void gpiod_unlock_as_irq(struct gpio_desc *desc)
+{
+	if (!desc)
+		return;
+
+	clear_bit(FLAG_USED_AS_IRQ, &desc->flags);
+}
+EXPORT_SYMBOL_GPL(gpiod_unlock_as_irq);
+
+void gpio_unlock_as_irq(struct gpio_chip *chip, unsigned int offset)
+{
+	return gpiod_unlock_as_irq(gpiochip_offset_to_desc(chip, offset));
+}
+EXPORT_SYMBOL_GPL(gpio_unlock_as_irq);
+
 
 /* There's no value in making it easy to inline GPIO calls that may sleep.
  * Common examples include ones connected to I2C or SPI chips.