Merge branch 'gpio-irqchip-rework' of /home/linus/linux-gpio into devel

2017-11-09 09:38:42 +01:00
parent 756a024f39 9e9355bb20
commit bee67c7c9d
88 changed files with 3158 additions and 515 deletions
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -72,6 +72,8 @@ static LIST_HEAD(gpio_lookup_list);
 LIST_HEAD(gpio_devices);

 static void gpiochip_free_hogs(struct gpio_chip *chip);
+static int gpiochip_add_irqchip(struct gpio_chip *gpiochip,
+				struct lock_class_key *key);
 static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip);
 static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip);
 static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip);
@@ -365,28 +367,28 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
 	struct linehandle_state *lh = filep->private_data;
 	void __user *ip = (void __user *)arg;
 	struct gpiohandle_data ghd;
+	int vals[GPIOHANDLES_MAX];
 	int i;

 	if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) {
-		int val;
+		/* TODO: check if descriptors are really input */
+		int ret = gpiod_get_array_value_complex(false,
+							true,
+							lh->numdescs,
+							lh->descs,
+							vals);
+		if (ret)
+			return ret;

 		memset(&ghd, 0, sizeof(ghd));
-
-		/* TODO: check if descriptors are really input */
-		for (i = 0; i < lh->numdescs; i++) {
-			val = gpiod_get_value_cansleep(lh->descs[i]);
-			if (val < 0)
-				return val;
-			ghd.values[i] = val;
-		}
+		for (i = 0; i < lh->numdescs; i++)
+			ghd.values[i] = vals[i];

 		if (copy_to_user(ip, &ghd, sizeof(ghd)))
 			return -EFAULT;

 		return 0;
 	} else if (cmd == GPIOHANDLE_SET_LINE_VALUES_IOCTL) {
-		int vals[GPIOHANDLES_MAX];
-
 		/* TODO: check if descriptors are really output */
 		if (copy_from_user(&ghd, ip, sizeof(ghd)))
 			return -EFAULT;
@@ -444,12 +446,25 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip)
 	struct linehandle_state *lh;
 	struct file *file;
 	int fd, i, ret;
+	u32 lflags;

 	if (copy_from_user(&handlereq, ip, sizeof(handlereq)))
 		return -EFAULT;
 	if ((handlereq.lines == 0) || (handlereq.lines > GPIOHANDLES_MAX))
 		return -EINVAL;

+	lflags = handlereq.flags;
+
+	/* Return an error if an unknown flag is set */
+	if (lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS)
+		return -EINVAL;
+
+	/* OPEN_DRAIN and OPEN_SOURCE flags only make sense for output mode. */
+	if (!(lflags & GPIOHANDLE_REQUEST_OUTPUT) &&
+	    ((lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) ||
+	     (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE)))
+		return -EINVAL;
+
 	lh = kzalloc(sizeof(*lh), GFP_KERNEL);
 	if (!lh)
 		return -ENOMEM;
@@ -470,7 +485,6 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip)
 	/* Request each GPIO */
 	for (i = 0; i < handlereq.lines; i++) {
 		u32 offset = handlereq.lineoffsets[i];
-		u32 lflags = handlereq.flags;
 		struct gpio_desc *desc;

 		if (offset >= gdev->ngpio) {
@@ -478,12 +492,6 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip)
 			goto out_free_descs;
 		}

-		/* Return an error if a unknown flag is set */
-		if (lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS) {
-			ret = -EINVAL;
-			goto out_free_descs;
-		}
-
 		desc = &gdev->descs[offset];
 		ret = gpiod_request(desc, lh->label);
 		if (ret)
@@ -1091,30 +1099,8 @@ static void gpiochip_setup_devs(void)
 	}
 }

-/**
- * gpiochip_add_data() - register a gpio_chip
- * @chip: the chip to register, with chip->base initialized
- * @data: driver-private data associated with this chip
- *
- * Context: potentially before irqs will work
- *
- * When gpiochip_add_data() is called very early during boot, so that GPIOs
- * can be freely used, the chip->parent device must be registered before
- * the gpio framework's arch_initcall().  Otherwise sysfs initialization
- * for GPIOs will fail rudely.
- *
- * gpiochip_add_data() must only be called after gpiolib initialization,
- * ie after core_initcall().
- *
- * If chip->base is negative, this requests dynamic assignment of
- * a range of valid GPIOs.
- *
- * Returns:
- * A negative errno if the chip can't be registered, such as because the
- * chip->base is invalid or already associated with a different chip.
- * Otherwise it returns zero as a success code.
- */
-int gpiochip_add_data(struct gpio_chip *chip, void *data)
+int gpiochip_add_data_with_key(struct gpio_chip *chip, void *data,
+			       struct lock_class_key *key)
 {
 	unsigned long	flags;
 	int		status = 0;
@@ -1260,6 +1246,10 @@ int gpiochip_add_data(struct gpio_chip *chip, void *data)
 	if (status)
 		goto err_remove_from_list;

+	status = gpiochip_add_irqchip(chip, key);
+	if (status)
+		goto err_remove_chip;
+
 	status = of_gpiochip_add(chip);
 	if (status)
 		goto err_remove_chip;
@@ -1303,7 +1293,7 @@ err_free_gdev:
 	kfree(gdev);
 	return status;
 }
-EXPORT_SYMBOL_GPL(gpiochip_add_data);
+EXPORT_SYMBOL_GPL(gpiochip_add_data_with_key);

 /**
 * gpiochip_get_data() - get per-subdriver data for the chip
@@ -1498,33 +1488,33 @@ static struct gpio_chip *find_chip_by_name(const char *name)

 static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip)
 {
-	if (!gpiochip->irq_need_valid_mask)
+	if (!gpiochip->irq.need_valid_mask)
 		return 0;

-	gpiochip->irq_valid_mask = kcalloc(BITS_TO_LONGS(gpiochip->ngpio),
+	gpiochip->irq.valid_mask = kcalloc(BITS_TO_LONGS(gpiochip->ngpio),
 					   sizeof(long), GFP_KERNEL);
-	if (!gpiochip->irq_valid_mask)
+	if (!gpiochip->irq.valid_mask)
 		return -ENOMEM;

 	/* Assume by default all GPIOs are valid */
-	bitmap_fill(gpiochip->irq_valid_mask, gpiochip->ngpio);
+	bitmap_fill(gpiochip->irq.valid_mask, gpiochip->ngpio);

 	return 0;
 }

 static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip)
 {
-	kfree(gpiochip->irq_valid_mask);
-	gpiochip->irq_valid_mask = NULL;
+	kfree(gpiochip->irq.valid_mask);
+	gpiochip->irq.valid_mask = NULL;
 }

 static bool gpiochip_irqchip_irq_valid(const struct gpio_chip *gpiochip,
 				       unsigned int offset)
 {
 	/* No mask means all valid */
-	if (likely(!gpiochip->irq_valid_mask))
+	if (likely(!gpiochip->irq.valid_mask))
 		return true;
-	return test_bit(offset, gpiochip->irq_valid_mask);
+	return test_bit(offset, gpiochip->irq.valid_mask);
 }

 /**
@@ -1544,7 +1534,7 @@ static void gpiochip_set_cascaded_irqchip(struct gpio_chip *gpiochip,
 {
 	unsigned int offset;

-	if (!gpiochip->irqdomain) {
+	if (!gpiochip->irq.domain) {
 		chip_err(gpiochip, "called %s before setting up irqchip\n",
 			 __func__);
 		return;
@@ -1564,14 +1554,15 @@ static void gpiochip_set_cascaded_irqchip(struct gpio_chip *gpiochip,
 		irq_set_chained_handler_and_data(parent_irq, parent_handler,
 						 gpiochip);

-		gpiochip->irq_chained_parent = parent_irq;
+		gpiochip->irq.parents = &parent_irq;
+		gpiochip->irq.num_parents = 1;
 	}

 	/* Set the parent IRQ for all affected IRQs */
 	for (offset = 0; offset < gpiochip->ngpio; offset++) {
 		if (!gpiochip_irqchip_irq_valid(gpiochip, offset))
 			continue;
-		irq_set_parent(irq_find_mapping(gpiochip->irqdomain, offset),
+		irq_set_parent(irq_find_mapping(gpiochip->irq.domain, offset),
 			       parent_irq);
 	}
 }
@@ -1591,6 +1582,11 @@ void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip,
 				  unsigned int parent_irq,
 				  irq_flow_handler_t parent_handler)
 {
+	if (gpiochip->irq.threaded) {
+		chip_err(gpiochip, "tried to chain a threaded gpiochip\n");
+		return;
+	}
+
 	gpiochip_set_cascaded_irqchip(gpiochip, irqchip, parent_irq,
 				      parent_handler);
 }
@@ -1607,10 +1603,6 @@ void gpiochip_set_nested_irqchip(struct gpio_chip *gpiochip,
 				 struct irq_chip *irqchip,
 				 unsigned int parent_irq)
 {
-	if (!gpiochip->irq_nested) {
-		chip_err(gpiochip, "tried to nest a chained gpiochip\n");
-		return;
-	}
 	gpiochip_set_cascaded_irqchip(gpiochip, irqchip, parent_irq,
 				      NULL);
 }
@@ -1626,10 +1618,11 @@ EXPORT_SYMBOL_GPL(gpiochip_set_nested_irqchip);
 * gpiochip by assigning the gpiochip as chip data, and using the irqchip
 * stored inside the gpiochip.
 */
-static int gpiochip_irq_map(struct irq_domain *d, unsigned int irq,
-			    irq_hw_number_t hwirq)
+int gpiochip_irq_map(struct irq_domain *d, unsigned int irq,
+		     irq_hw_number_t hwirq)
 {
 	struct gpio_chip *chip = d->host_data;
+	int err = 0;

 	if (!gpiochip_irqchip_irq_valid(chip, hwirq))
 		return -ENXIO;
@@ -1639,32 +1632,42 @@ static int gpiochip_irq_map(struct irq_domain *d, unsigned int irq,
 	 * This lock class tells lockdep that GPIO irqs are in a different
 	 * category than their parents, so it won't report false recursion.
 	 */
-	irq_set_lockdep_class(irq, chip->lock_key);
-	irq_set_chip_and_handler(irq, chip->irqchip, chip->irq_handler);
+	irq_set_lockdep_class(irq, chip->irq.lock_key);
+	irq_set_chip_and_handler(irq, chip->irq.chip, chip->irq.handler);
 	/* Chips that use nested thread handlers have them marked */
-	if (chip->irq_nested)
+	if (chip->irq.threaded)
 		irq_set_nested_thread(irq, 1);
 	irq_set_noprobe(irq);

+	if (chip->irq.num_parents == 1)
+		err = irq_set_parent(irq, chip->irq.parents[0]);
+	else if (chip->irq.map)
+		err = irq_set_parent(irq, chip->irq.map[hwirq]);
+
+	if (err < 0)
+		return err;
+
 	/*
 	 * No set-up of the hardware will happen if IRQ_TYPE_NONE
 	 * is passed as default type.
 	 */
-	if (chip->irq_default_type != IRQ_TYPE_NONE)
-		irq_set_irq_type(irq, chip->irq_default_type);
+	if (chip->irq.default_type != IRQ_TYPE_NONE)
+		irq_set_irq_type(irq, chip->irq.default_type);

 	return 0;
 }
+EXPORT_SYMBOL_GPL(gpiochip_irq_map);

-static void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq)
+void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq)
 {
 	struct gpio_chip *chip = d->host_data;

-	if (chip->irq_nested)
+	if (chip->irq.threaded)
 		irq_set_nested_thread(irq, 0);
 	irq_set_chip_and_handler(irq, NULL, NULL);
 	irq_set_chip_data(irq, NULL);
 }
+EXPORT_SYMBOL_GPL(gpiochip_irq_unmap);

 static const struct irq_domain_ops gpiochip_domain_ops = {
 	.map	= gpiochip_irq_map,
@@ -1702,7 +1705,94 @@ static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset)
 {
 	if (!gpiochip_irqchip_irq_valid(chip, offset))
 		return -ENXIO;
-	return irq_create_mapping(chip->irqdomain, offset);
+
+	return irq_create_mapping(chip->irq.domain, offset);
+}
+
+/**
+ * gpiochip_add_irqchip() - adds an IRQ chip to a GPIO chip
+ * @gpiochip: the GPIO chip to add the IRQ chip to
+ * @lock_key: lockdep class
+ */
+static int gpiochip_add_irqchip(struct gpio_chip *gpiochip,
+				struct lock_class_key *lock_key)
+{
+	struct irq_chip *irqchip = gpiochip->irq.chip;
+	const struct irq_domain_ops *ops;
+	struct device_node *np;
+	unsigned int type;
+	unsigned int i;
+
+	if (!irqchip)
+		return 0;
+
+	if (gpiochip->irq.parent_handler && gpiochip->can_sleep) {
+		chip_err(gpiochip, "you cannot have chained interrupts on a "
+			 "chip that may sleep\n");
+		return -EINVAL;
+	}
+
+	np = gpiochip->gpiodev->dev.of_node;
+	type = gpiochip->irq.default_type;
+
+	/*
+	 * Specifying a default trigger is a terrible idea if DT or ACPI is
+	 * used to configure the interrupts, as you may end up with
+	 * conflicting triggers. Tell the user, and reset to NONE.
+	 */
+	if (WARN(np && type != IRQ_TYPE_NONE,
+		 "%s: Ignoring %u default trigger\n", np->full_name, type))
+		type = IRQ_TYPE_NONE;
+
+	if (has_acpi_companion(gpiochip->parent) && type != IRQ_TYPE_NONE) {
+		acpi_handle_warn(ACPI_HANDLE(gpiochip->parent),
+				 "Ignoring %u default trigger\n", type);
+		type = IRQ_TYPE_NONE;
+	}
+
+	gpiochip->to_irq = gpiochip_to_irq;
+	gpiochip->irq.default_type = type;
+	gpiochip->irq.lock_key = lock_key;
+
+	if (gpiochip->irq.domain_ops)
+		ops = gpiochip->irq.domain_ops;
+	else
+		ops = &gpiochip_domain_ops;
+
+	gpiochip->irq.domain = irq_domain_add_simple(np, gpiochip->ngpio,
+						     gpiochip->irq.first,
+						     ops, gpiochip);
+	if (!gpiochip->irq.domain)
+		return -EINVAL;
+
+	/*
+	 * It is possible for a driver to override this, but only if the
+	 * alternative functions are both implemented.
+	 */
+	if (!irqchip->irq_request_resources &&
+	    !irqchip->irq_release_resources) {
+		irqchip->irq_request_resources = gpiochip_irq_reqres;
+		irqchip->irq_release_resources = gpiochip_irq_relres;
+	}
+
+	if (gpiochip->irq.parent_handler) {
+		void *data = gpiochip->irq.parent_handler_data ?: gpiochip;
+
+		for (i = 0; i < gpiochip->irq.num_parents; i++) {
+			/*
+			 * The parent IRQ chip is already using the chip_data
+			 * for this IRQ chip, so our callbacks simply use the
+			 * handler_data.
+			 */
+			irq_set_chained_handler_and_data(gpiochip->irq.parents[i],
+							 gpiochip->irq.parent_handler,
+							 data);
+		}
+	}
+
+	acpi_gpiochip_request_interrupts(gpiochip);
+
+	return 0;
 }

 /**
@@ -1717,26 +1807,34 @@ static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip)

 	acpi_gpiochip_free_interrupts(gpiochip);

-	if (gpiochip->irq_chained_parent) {
-		irq_set_chained_handler(gpiochip->irq_chained_parent, NULL);
-		irq_set_handler_data(gpiochip->irq_chained_parent, NULL);
+	if (gpiochip->irq.chip && gpiochip->irq.parent_handler) {
+		struct gpio_irq_chip *irq = &gpiochip->irq;
+		unsigned int i;
+
+		for (i = 0; i < irq->num_parents; i++)
+			irq_set_chained_handler_and_data(irq->parents[i],
+							 NULL, NULL);
 	}

 	/* Remove all IRQ mappings and delete the domain */
-	if (gpiochip->irqdomain) {
+	if (gpiochip->irq.domain) {
+		unsigned int irq;
+
 		for (offset = 0; offset < gpiochip->ngpio; offset++) {
 			if (!gpiochip_irqchip_irq_valid(gpiochip, offset))
 				continue;
-			irq_dispose_mapping(
-				irq_find_mapping(gpiochip->irqdomain, offset));
+
+			irq = irq_find_mapping(gpiochip->irq.domain, offset);
+			irq_dispose_mapping(irq);
 		}
-		irq_domain_remove(gpiochip->irqdomain);
+
+		irq_domain_remove(gpiochip->irq.domain);
 	}

-	if (gpiochip->irqchip) {
-		gpiochip->irqchip->irq_request_resources = NULL;
-		gpiochip->irqchip->irq_release_resources = NULL;
-		gpiochip->irqchip = NULL;
+	if (gpiochip->irq.chip) {
+		gpiochip->irq.chip->irq_request_resources = NULL;
+		gpiochip->irq.chip->irq_release_resources = NULL;
+		gpiochip->irq.chip = NULL;
 	}

 	gpiochip_irqchip_free_valid_mask(gpiochip);
@@ -1751,8 +1849,7 @@ static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip)
 * @handler: the irq handler to use (often a predefined irq core function)
 * @type: the default type for IRQs on this irqchip, pass IRQ_TYPE_NONE
 * to have the core avoid setting up any default type in the hardware.
- * @nested: whether this is a nested irqchip calling handle_nested_irq()
- * in its IRQ handler
+ * @threaded: whether this irqchip uses a nested thread handler
 * @lock_key: lockdep class
 *
 * This function closely associates a certain irqchip with a certain
@@ -1774,7 +1871,7 @@ int gpiochip_irqchip_add_key(struct gpio_chip *gpiochip,
 			     unsigned int first_irq,
 			     irq_flow_handler_t handler,
 			     unsigned int type,
-			     bool nested,
+			     bool threaded,
 			     struct lock_class_key *lock_key)
 {
 	struct device_node *of_node;
@@ -1786,7 +1883,7 @@ int gpiochip_irqchip_add_key(struct gpio_chip *gpiochip,
 		pr_err("missing gpiochip .dev parent pointer\n");
 		return -EINVAL;
 	}
-	gpiochip->irq_nested = nested;
+	gpiochip->irq.threaded = threaded;
 	of_node = gpiochip->parent->of_node;
 #ifdef CONFIG_OF_GPIO
 	/*
@@ -1811,16 +1908,16 @@ int gpiochip_irqchip_add_key(struct gpio_chip *gpiochip,
 		type = IRQ_TYPE_NONE;
 	}

-	gpiochip->irqchip = irqchip;
-	gpiochip->irq_handler = handler;
-	gpiochip->irq_default_type = type;
+	gpiochip->irq.chip = irqchip;
+	gpiochip->irq.handler = handler;
+	gpiochip->irq.default_type = type;
 	gpiochip->to_irq = gpiochip_to_irq;
-	gpiochip->lock_key = lock_key;
-	gpiochip->irqdomain = irq_domain_add_simple(of_node,
+	gpiochip->irq.lock_key = lock_key;
+	gpiochip->irq.domain = irq_domain_add_simple(of_node,
 					gpiochip->ngpio, first_irq,
 					&gpiochip_domain_ops, gpiochip);
-	if (!gpiochip->irqdomain) {
-		gpiochip->irqchip = NULL;
+	if (!gpiochip->irq.domain) {
+		gpiochip->irq.chip = NULL;
 		return -EINVAL;
 	}

@@ -1842,6 +1939,12 @@ EXPORT_SYMBOL_GPL(gpiochip_irqchip_add_key);

 #else /* CONFIG_GPIOLIB_IRQCHIP */

+static inline int gpiochip_add_irqchip(struct gpio_chip *gpiochip,
+				       struct lock_class_key *key)
+{
+	return 0;
+}
+
 static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) {}
 static inline int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip)
 {
@@ -2013,7 +2116,7 @@ EXPORT_SYMBOL_GPL(gpiochip_remove_pin_ranges);
 * on each other, and help provide better diagnostics in debugfs.
 * They're called even less than the "set direction" calls.
 */
-static int __gpiod_request(struct gpio_desc *desc, const char *label)
+static int gpiod_request_commit(struct gpio_desc *desc, const char *label)
 {
 	struct gpio_chip	*chip = desc->gdev->chip;
 	int			status;
@@ -2106,7 +2209,7 @@ int gpiod_request(struct gpio_desc *desc, const char *label)
 	gdev = desc->gdev;

 	if (try_module_get(gdev->owner)) {
-		status = __gpiod_request(desc, label);
+		status = gpiod_request_commit(desc, label);
 		if (status < 0)
 			module_put(gdev->owner);
 		else
@@ -2119,7 +2222,7 @@ int gpiod_request(struct gpio_desc *desc, const char *label)
 	return status;
 }

-static bool __gpiod_free(struct gpio_desc *desc)
+static bool gpiod_free_commit(struct gpio_desc *desc)
 {
 	bool			ret = false;
 	unsigned long		flags;
@@ -2154,7 +2257,7 @@ static bool __gpiod_free(struct gpio_desc *desc)

 void gpiod_free(struct gpio_desc *desc)
 {
-	if (desc && desc->gdev && __gpiod_free(desc)) {
+	if (desc && desc->gdev && gpiod_free_commit(desc)) {
 		module_put(desc->gdev->owner);
 		put_device(&desc->gdev->dev);
 	} else {
@@ -2217,7 +2320,7 @@ struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum,
 		return desc;
 	}

-	err = __gpiod_request(desc, label);
+	err = gpiod_request_commit(desc, label);
 	if (err < 0)
 		return ERR_PTR(err);

@@ -2235,7 +2338,7 @@ EXPORT_SYMBOL_GPL(gpiochip_request_own_desc);
 void gpiochip_free_own_desc(struct gpio_desc *desc)
 {
 	if (desc)
-		__gpiod_free(desc);
+		gpiod_free_commit(desc);
 }
 EXPORT_SYMBOL_GPL(gpiochip_free_own_desc);

@@ -2291,44 +2394,12 @@ static int gpio_set_drive_single_ended(struct gpio_chip *gc, unsigned offset,
 	return gc->set_config ? gc->set_config(gc, offset, config) : -ENOTSUPP;
 }

-static int _gpiod_direction_output_raw(struct gpio_desc *desc, int value)
+static int gpiod_direction_output_raw_commit(struct gpio_desc *desc, int value)
 {
 	struct gpio_chip *gc = desc->gdev->chip;
 	int val = !!value;
 	int ret;

-	/* GPIOs used for IRQs shall not be set as output */
-	if (test_bit(FLAG_USED_AS_IRQ, &desc->flags)) {
-		gpiod_err(desc,
-			  "%s: tried to set a GPIO tied to an IRQ as output\n",
-			  __func__);
-		return -EIO;
-	}
-
-	if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) {
-		/* First see if we can enable open drain in hardware */
-		ret = gpio_set_drive_single_ended(gc, gpio_chip_hwgpio(desc),
-						  PIN_CONFIG_DRIVE_OPEN_DRAIN);
-		if (!ret)
-			goto set_output_value;
-		/* Emulate open drain by not actively driving the line high */
-		if (val)
-			return gpiod_direction_input(desc);
-	}
-	else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) {
-		ret = gpio_set_drive_single_ended(gc, gpio_chip_hwgpio(desc),
-						  PIN_CONFIG_DRIVE_OPEN_SOURCE);
-		if (!ret)
-			goto set_output_value;
-		/* Emulate open source by not actively driving the line low */
-		if (!val)
-			return gpiod_direction_input(desc);
-	} else {
-		gpio_set_drive_single_ended(gc, gpio_chip_hwgpio(desc),
-					    PIN_CONFIG_DRIVE_PUSH_PULL);
-	}
-
-set_output_value:
 	if (!gc->set || !gc->direction_output) {
 		gpiod_warn(desc,
 		       "%s: missing set() or direction_output() operations\n",
@@ -2358,7 +2429,7 @@ set_output_value:
 int gpiod_direction_output_raw(struct gpio_desc *desc, int value)
 {
 	VALIDATE_DESC(desc);
-	return _gpiod_direction_output_raw(desc, value);
+	return gpiod_direction_output_raw_commit(desc, value);
 }
 EXPORT_SYMBOL_GPL(gpiod_direction_output_raw);

@@ -2376,12 +2447,48 @@ EXPORT_SYMBOL_GPL(gpiod_direction_output_raw);
 */
 int gpiod_direction_output(struct gpio_desc *desc, int value)
 {
+	struct gpio_chip *gc = desc->gdev->chip;
+	int ret;
+
 	VALIDATE_DESC(desc);
 	if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
 		value = !value;
 	else
 		value = !!value;
-	return _gpiod_direction_output_raw(desc, value);
+
+	/* GPIOs used for IRQs shall not be set as output */
+	if (test_bit(FLAG_USED_AS_IRQ, &desc->flags)) {
+		gpiod_err(desc,
+			  "%s: tried to set a GPIO tied to an IRQ as output\n",
+			  __func__);
+		return -EIO;
+	}
+
+	if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) {
+		/* First see if we can enable open drain in hardware */
+		ret = gpio_set_drive_single_ended(gc, gpio_chip_hwgpio(desc),
+						  PIN_CONFIG_DRIVE_OPEN_DRAIN);
+		if (!ret)
+			goto set_output_value;
+		/* Emulate open drain by not actively driving the line high */
+		if (value)
+			return gpiod_direction_input(desc);
+	}
+	else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) {
+		ret = gpio_set_drive_single_ended(gc, gpio_chip_hwgpio(desc),
+						  PIN_CONFIG_DRIVE_OPEN_SOURCE);
+		if (!ret)
+			goto set_output_value;
+		/* Emulate open source by not actively driving the line low */
+		if (!value)
+			return gpiod_direction_input(desc);
+	} else {
+		gpio_set_drive_single_ended(gc, gpio_chip_hwgpio(desc),
+					    PIN_CONFIG_DRIVE_PUSH_PULL);
+	}
+
+set_output_value:
+	return gpiod_direction_output_raw_commit(desc, value);
 }
 EXPORT_SYMBOL_GPL(gpiod_direction_output);

@@ -2448,7 +2555,7 @@ EXPORT_SYMBOL_GPL(gpiod_is_active_low);
 * that the GPIO was actually requested.
 */

-static int _gpiod_get_raw_value(const struct gpio_desc *desc)
+static int gpiod_get_raw_value_commit(const struct gpio_desc *desc)
 {
 	struct gpio_chip	*chip;
 	int offset;
@@ -2462,6 +2569,71 @@ static int _gpiod_get_raw_value(const struct gpio_desc *desc)
 	return value;
 }

+static int gpio_chip_get_multiple(struct gpio_chip *chip,
+				  unsigned long *mask, unsigned long *bits)
+{
+	if (chip->get_multiple) {
+		return chip->get_multiple(chip, mask, bits);
+	} else if (chip->get) {
+		int i, value;
+
+		for_each_set_bit(i, mask, chip->ngpio) {
+			value = chip->get(chip, i);
+			if (value < 0)
+				return value;
+			__assign_bit(i, bits, value);
+		}
+		return 0;
+	}
+	return -EIO;
+}
+
+int gpiod_get_array_value_complex(bool raw, bool can_sleep,
+				  unsigned int array_size,
+				  struct gpio_desc **desc_array,
+				  int *value_array)
+{
+	int i = 0;
+
+	while (i < array_size) {
+		struct gpio_chip *chip = desc_array[i]->gdev->chip;
+		unsigned long mask[BITS_TO_LONGS(chip->ngpio)];
+		unsigned long bits[BITS_TO_LONGS(chip->ngpio)];
+		int first, j, ret;
+
+		if (!can_sleep)
+			WARN_ON(chip->can_sleep);
+
+		/* collect all inputs belonging to the same chip */
+		first = i;
+		memset(mask, 0, sizeof(mask));
+		do {
+			const struct gpio_desc *desc = desc_array[i];
+			int hwgpio = gpio_chip_hwgpio(desc);
+
+			__set_bit(hwgpio, mask);
+			i++;
+		} while ((i < array_size) &&
+			 (desc_array[i]->gdev->chip == chip));
+
+		ret = gpio_chip_get_multiple(chip, mask, bits);
+		if (ret)
+			return ret;
+
+		for (j = first; j < i; j++) {
+			const struct gpio_desc *desc = desc_array[j];
+			int hwgpio = gpio_chip_hwgpio(desc);
+			int value = test_bit(hwgpio, bits);
+
+			if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags))
+				value = !value;
+			value_array[j] = value;
+			trace_gpio_value(desc_to_gpio(desc), 1, value);
+		}
+	}
+	return 0;
+}
+
 /**
 * gpiod_get_raw_value() - return a gpio's raw value
 * @desc: gpio whose value will be returned
@@ -2477,7 +2649,7 @@ int gpiod_get_raw_value(const struct gpio_desc *desc)
 	VALIDATE_DESC(desc);
 	/* Should be using gpio_get_value_cansleep() */
 	WARN_ON(desc->gdev->chip->can_sleep);
-	return _gpiod_get_raw_value(desc);
+	return gpiod_get_raw_value_commit(desc);
 }
 EXPORT_SYMBOL_GPL(gpiod_get_raw_value);

@@ -2499,7 +2671,7 @@ int gpiod_get_value(const struct gpio_desc *desc)
 	/* Should be using gpio_get_value_cansleep() */
 	WARN_ON(desc->gdev->chip->can_sleep);

-	value = _gpiod_get_raw_value(desc);
+	value = gpiod_get_raw_value_commit(desc);
 	if (value < 0)
 		return value;

@@ -2510,12 +2682,57 @@ int gpiod_get_value(const struct gpio_desc *desc)
 }
 EXPORT_SYMBOL_GPL(gpiod_get_value);

+/**
+ * gpiod_get_raw_array_value() - read raw values from an array of GPIOs
+ * @array_size: number of elements in the descriptor / value arrays
+ * @desc_array: array of GPIO descriptors whose values will be read
+ * @value_array: array to store the read values
+ *
+ * Read the raw values of the GPIOs, i.e. the values of the physical lines
+ * without regard for their ACTIVE_LOW status.  Return 0 in case of success,
+ * else an error code.
+ *
+ * This function should be called from contexts where we cannot sleep,
+ * and it will complain if the GPIO chip functions potentially sleep.
+ */
+int gpiod_get_raw_array_value(unsigned int array_size,
+			      struct gpio_desc **desc_array, int *value_array)
+{
+	if (!desc_array)
+		return -EINVAL;
+	return gpiod_get_array_value_complex(true, false, array_size,
+					     desc_array, value_array);
+}
+EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value);
+
+/**
+ * gpiod_get_array_value() - read values from an array of GPIOs
+ * @array_size: number of elements in the descriptor / value arrays
+ * @desc_array: array of GPIO descriptors whose values will be read
+ * @value_array: array to store the read values
+ *
+ * Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
+ * into account.  Return 0 in case of success, else an error code.
+ *
+ * This function should be called from contexts where we cannot sleep,
+ * and it will complain if the GPIO chip functions potentially sleep.
+ */
+int gpiod_get_array_value(unsigned int array_size,
+			  struct gpio_desc **desc_array, int *value_array)
+{
+	if (!desc_array)
+		return -EINVAL;
+	return gpiod_get_array_value_complex(false, false, array_size,
+					     desc_array, value_array);
+}
+EXPORT_SYMBOL_GPL(gpiod_get_array_value);
+
 /*
- *  _gpio_set_open_drain_value() - Set the open drain gpio's value.
+ *  gpio_set_open_drain_value_commit() - Set the open drain gpio's value.
 * @desc: gpio descriptor whose state need to be set.
 * @value: Non-zero for setting it HIGH otherwise it will set to LOW.
 */
-static void _gpio_set_open_drain_value(struct gpio_desc *desc, bool value)
+static void gpio_set_open_drain_value_commit(struct gpio_desc *desc, bool value)
 {
 	int err = 0;
 	struct gpio_chip *chip = desc->gdev->chip;
@@ -2542,7 +2759,7 @@ static void _gpio_set_open_drain_value(struct gpio_desc *desc, bool value)
 * @desc: gpio descriptor whose state need to be set.
 * @value: Non-zero for setting it HIGH otherwise it will set to LOW.
 */
-static void _gpio_set_open_source_value(struct gpio_desc *desc, bool value)
+static void gpio_set_open_source_value_commit(struct gpio_desc *desc, bool value)
 {
 	int err = 0;
 	struct gpio_chip *chip = desc->gdev->chip;
@@ -2564,18 +2781,13 @@ static void _gpio_set_open_source_value(struct gpio_desc *desc, bool value)
 			  __func__, err);
 }

-static void _gpiod_set_raw_value(struct gpio_desc *desc, bool value)
+static void gpiod_set_raw_value_commit(struct gpio_desc *desc, bool value)
 {
 	struct gpio_chip	*chip;

 	chip = desc->gdev->chip;
 	trace_gpio_value(desc_to_gpio(desc), 0, value);
-	if (test_bit(FLAG_OPEN_DRAIN, &desc->flags))
-		_gpio_set_open_drain_value(desc, value);
-	else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags))
-		_gpio_set_open_source_value(desc, value);
-	else
-		chip->set(chip, gpio_chip_hwgpio(desc), value);
+	chip->set(chip, gpio_chip_hwgpio(desc), value);
 }

 /*
@@ -2630,10 +2842,10 @@ void gpiod_set_array_value_complex(bool raw, bool can_sleep,
 			 * collect all normal outputs belonging to the same chip
 			 * open drain and open source outputs are set individually
 			 */
-			if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) {
-				_gpio_set_open_drain_value(desc, value);
-			} else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) {
-				_gpio_set_open_source_value(desc, value);
+			if (test_bit(FLAG_OPEN_DRAIN, &desc->flags) && !raw) {
+				gpio_set_open_drain_value_commit(desc, value);
+			} else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags) && !raw) {
+				gpio_set_open_source_value_commit(desc, value);
 			} else {
 				__set_bit(hwgpio, mask);
 				if (value)
@@ -2667,7 +2879,7 @@ void gpiod_set_raw_value(struct gpio_desc *desc, int value)
 	VALIDATE_DESC_VOID(desc);
 	/* Should be using gpiod_set_value_cansleep() */
 	WARN_ON(desc->gdev->chip->can_sleep);
-	_gpiod_set_raw_value(desc, value);
+	gpiod_set_raw_value_commit(desc, value);
 }
 EXPORT_SYMBOL_GPL(gpiod_set_raw_value);

@@ -2676,8 +2888,8 @@ EXPORT_SYMBOL_GPL(gpiod_set_raw_value);
 * @desc: gpio whose value will be assigned
 * @value: value to assign
 *
- * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into
- * account
+ * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW,
+ * OPEN_DRAIN and OPEN_SOURCE flags into account.
 *
 * This function should be called from contexts where we cannot sleep, and will
 * complain if the GPIO chip functions potentially sleep.
@@ -2689,7 +2901,12 @@ void gpiod_set_value(struct gpio_desc *desc, int value)
 	WARN_ON(desc->gdev->chip->can_sleep);
 	if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
 		value = !value;
-	_gpiod_set_raw_value(desc, value);
+	if (test_bit(FLAG_OPEN_DRAIN, &desc->flags))
+		gpio_set_open_drain_value_commit(desc, value);
+	else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags))
+		gpio_set_open_source_value_commit(desc, value);
+	else
+		gpiod_set_raw_value_commit(desc, value);
 }
 EXPORT_SYMBOL_GPL(gpiod_set_value);

@@ -2890,7 +3107,7 @@ bool gpiochip_line_is_persistent(struct gpio_chip *chip, unsigned int offset)
 	if (offset >= chip->ngpio)
 		return false;

-	return !test_bit(FLAG_SLEEP_MAY_LOOSE_VALUE,
+	return !test_bit(FLAG_SLEEP_MAY_LOSE_VALUE,
 			 &chip->gpiodev->descs[offset].flags);
 }
 EXPORT_SYMBOL_GPL(gpiochip_line_is_persistent);
@@ -2908,7 +3125,7 @@ int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc)
 {
 	might_sleep_if(extra_checks);
 	VALIDATE_DESC(desc);
-	return _gpiod_get_raw_value(desc);
+	return gpiod_get_raw_value_commit(desc);
 }
 EXPORT_SYMBOL_GPL(gpiod_get_raw_value_cansleep);

@@ -2927,7 +3144,7 @@ int gpiod_get_value_cansleep(const struct gpio_desc *desc)

 	might_sleep_if(extra_checks);
 	VALIDATE_DESC(desc);
-	value = _gpiod_get_raw_value(desc);
+	value = gpiod_get_raw_value_commit(desc);
 	if (value < 0)
 		return value;

@@ -2938,6 +3155,53 @@ int gpiod_get_value_cansleep(const struct gpio_desc *desc)
 }
 EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep);

+/**
+ * gpiod_get_raw_array_value_cansleep() - read raw values from an array of GPIOs
+ * @array_size: number of elements in the descriptor / value arrays
+ * @desc_array: array of GPIO descriptors whose values will be read
+ * @value_array: array to store the read values
+ *
+ * Read the raw values of the GPIOs, i.e. the values of the physical lines
+ * without regard for their ACTIVE_LOW status.  Return 0 in case of success,
+ * else an error code.
+ *
+ * This function is to be called from contexts that can sleep.
+ */
+int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
+				       struct gpio_desc **desc_array,
+				       int *value_array)
+{
+	might_sleep_if(extra_checks);
+	if (!desc_array)
+		return -EINVAL;
+	return gpiod_get_array_value_complex(true, true, array_size,
+					     desc_array, value_array);
+}
+EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep);
+
+/**
+ * gpiod_get_array_value_cansleep() - read values from an array of GPIOs
+ * @array_size: number of elements in the descriptor / value arrays
+ * @desc_array: array of GPIO descriptors whose values will be read
+ * @value_array: array to store the read values
+ *
+ * Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
+ * into account.  Return 0 in case of success, else an error code.
+ *
+ * This function is to be called from contexts that can sleep.
+ */
+int gpiod_get_array_value_cansleep(unsigned int array_size,
+				   struct gpio_desc **desc_array,
+				   int *value_array)
+{
+	might_sleep_if(extra_checks);
+	if (!desc_array)
+		return -EINVAL;
+	return gpiod_get_array_value_complex(false, true, array_size,
+					     desc_array, value_array);
+}
+EXPORT_SYMBOL_GPL(gpiod_get_array_value_cansleep);
+
 /**
 * gpiod_set_raw_value_cansleep() - assign a gpio's raw value
 * @desc: gpio whose value will be assigned
@@ -2952,7 +3216,7 @@ void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value)
 {
 	might_sleep_if(extra_checks);
 	VALIDATE_DESC_VOID(desc);
-	_gpiod_set_raw_value(desc, value);
+	gpiod_set_raw_value_commit(desc, value);
 }
 EXPORT_SYMBOL_GPL(gpiod_set_raw_value_cansleep);

@@ -2972,7 +3236,7 @@ void gpiod_set_value_cansleep(struct gpio_desc *desc, int value)
 	VALIDATE_DESC_VOID(desc);
 	if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
 		value = !value;
-	_gpiod_set_raw_value(desc, value);
+	gpiod_set_raw_value_commit(desc, value);
 }
 EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep);

@@ -3268,8 +3532,8 @@ int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id,
 		set_bit(FLAG_OPEN_DRAIN, &desc->flags);
 	if (lflags & GPIO_OPEN_SOURCE)
 		set_bit(FLAG_OPEN_SOURCE, &desc->flags);
-	if (lflags & GPIO_SLEEP_MAY_LOOSE_VALUE)
-		set_bit(FLAG_SLEEP_MAY_LOOSE_VALUE, &desc->flags);
+	if (lflags & GPIO_SLEEP_MAY_LOSE_VALUE)
+		set_bit(FLAG_SLEEP_MAY_LOSE_VALUE, &desc->flags);

 	/* No particular flag request, return here... */
 	if (!(dflags & GPIOD_FLAGS_BIT_DIR_SET)) {