EXPORT_SYMBOL_GPL(gpio_to_desc);
/**
- * Convert an offset on a certain chip to a corresponding descriptor
+ * Get the GPIO descriptor corresponding to the given hw number for this chip.
*/
-static struct gpio_desc *gpiochip_offset_to_desc(struct gpio_chip *chip,
- unsigned int offset)
+struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip,
+ u16 hwnum)
{
- if (offset >= chip->ngpio)
+ if (hwnum >= chip->ngpio)
return ERR_PTR(-EINVAL);
- return &chip->desc[offset];
+ return &chip->desc[hwnum];
}
+EXPORT_SYMBOL_GPL(gpiochip_get_desc);
/**
* Convert a GPIO descriptor to the integer namespace.
if (!test_bit(FLAG_EXPORT, &desc->flags))
status = -EIO;
else if (sysfs_streq(buf, "high"))
- status = gpiod_direction_output(desc, 1);
+ status = gpiod_direction_output_raw(desc, 1);
else if (sysfs_streq(buf, "out") || sysfs_streq(buf, "low"))
- status = gpiod_direction_output(desc, 0);
+ status = gpiod_direction_output_raw(desc, 0);
else if (sysfs_streq(buf, "in"))
status = gpiod_direction_input(desc);
else
}
EXPORT_SYMBOL_GPL(gpiochip_add);
+/* Forward-declaration */
+static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip);
+
/**
* gpiochip_remove() - unregister a gpio_chip
* @chip: the chip to unregister
int status = 0;
unsigned id;
+ acpi_gpiochip_remove(chip);
+
spin_lock_irqsave(&gpio_lock, flags);
+ gpiochip_irqchip_remove(chip);
gpiochip_remove_pin_ranges(chip);
of_gpiochip_remove(chip);
- acpi_gpiochip_remove(chip);
for (id = 0; id < chip->ngpio; id++) {
if (test_bit(FLAG_REQUESTED, &chip->desc[id].flags)) {
return gpiochip_find((void *)name, gpiochip_match_name);
}
+#ifdef CONFIG_GPIOLIB_IRQCHIP
+
+/*
+ * The following is irqchip helper code for gpiochips.
+ */
+
+/**
+ * gpiochip_add_chained_irqchip() - adds a chained irqchip to a gpiochip
+ * @gpiochip: the gpiochip to add the irqchip to
+ * @irqchip: the irqchip to add to the gpiochip
+ * @parent_irq: the irq number corresponding to the parent IRQ for this
+ * chained irqchip
+ * @parent_handler: the parent interrupt handler for the accumulated IRQ
+ * coming out of the gpiochip
+ */
+void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip,
+ struct irq_chip *irqchip,
+ int parent_irq,
+ irq_flow_handler_t parent_handler)
+{
+ irq_set_chained_handler(parent_irq, parent_handler);
+ /*
+ * The parent irqchip is already using the chip_data for this
+ * irqchip, so our callbacks simply use the handler_data.
+ */
+ irq_set_handler_data(parent_irq, gpiochip);
+}
+EXPORT_SYMBOL_GPL(gpiochip_set_chained_irqchip);
+
+/**
+ * gpiochip_irq_map() - maps an IRQ into a GPIO irqchip
+ * @d: the irqdomain used by this irqchip
+ * @irq: the global irq number used by this GPIO irqchip irq
+ * @hwirq: the local IRQ/GPIO line offset on this gpiochip
+ *
+ * This function will set up the mapping for a certain IRQ line on a
+ * 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)
+{
+ struct gpio_chip *chip = d->host_data;
+
+ irq_set_chip_and_handler(irq, chip->irqchip, chip->irq_handler);
+ irq_set_chip_data(irq, chip);
+#ifdef CONFIG_ARM
+ set_irq_flags(irq, IRQF_VALID);
+#else
+ irq_set_noprobe(irq);
+#endif
+ irq_set_irq_type(irq, chip->irq_default_type);
+
+ return 0;
+}
+
+static void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq)
+{
+#ifdef CONFIG_ARM
+ set_irq_flags(irq, 0);
+#endif
+ irq_set_chip_and_handler(irq, NULL, NULL);
+ irq_set_chip_data(irq, NULL);
+}
+
+static const struct irq_domain_ops gpiochip_domain_ops = {
+ .map = gpiochip_irq_map,
+ .unmap = gpiochip_irq_unmap,
+ /* Virtually all GPIO irqchips are twocell:ed */
+ .xlate = irq_domain_xlate_twocell,
+};
+
+static int gpiochip_irq_reqres(struct irq_data *d)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
+
+ if (gpio_lock_as_irq(chip, d->hwirq)) {
+ chip_err(chip,
+ "unable to lock HW IRQ %lu for IRQ\n",
+ d->hwirq);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static void gpiochip_irq_relres(struct irq_data *d)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
+
+ gpio_unlock_as_irq(chip, d->hwirq);
+}
+
+static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+ return irq_find_mapping(chip->irqdomain, offset);
+}
+
+/**
+ * gpiochip_irqchip_remove() - removes an irqchip added to a gpiochip
+ * @gpiochip: the gpiochip to remove the irqchip from
+ *
+ * This is called only from gpiochip_remove()
+ */
+static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip)
+{
+ unsigned int offset;
+
+ /* Remove all IRQ mappings and delete the domain */
+ if (gpiochip->irqdomain) {
+ for (offset = 0; offset < gpiochip->ngpio; offset++)
+ irq_dispose_mapping(gpiochip->irq_base + offset);
+ irq_domain_remove(gpiochip->irqdomain);
+ }
+
+ if (gpiochip->irqchip) {
+ gpiochip->irqchip->irq_request_resources = NULL;
+ gpiochip->irqchip->irq_release_resources = NULL;
+ gpiochip->irqchip = NULL;
+ }
+}
+
+/**
+ * gpiochip_irqchip_add() - adds an irqchip to a gpiochip
+ * @gpiochip: the gpiochip to add the irqchip to
+ * @irqchip: the irqchip to add to the gpiochip
+ * @first_irq: if not dynamically assigned, the base (first) IRQ to
+ * allocate gpiochip irqs from
+ * @handler: the irq handler to use (often a predefined irq core function)
+ * @type: the default type for IRQs on this irqchip
+ *
+ * This function closely associates a certain irqchip with a certain
+ * gpiochip, providing an irq domain to translate the local IRQs to
+ * global irqs in the gpiolib core, and making sure that the gpiochip
+ * is passed as chip data to all related functions. Driver callbacks
+ * need to use container_of() to get their local state containers back
+ * from the gpiochip passed as chip data. An irqdomain will be stored
+ * in the gpiochip that shall be used by the driver to handle IRQ number
+ * translation. The gpiochip will need to be initialized and registered
+ * before calling this function.
+ *
+ * This function will handle two cell:ed simple IRQs and assumes all
+ * the pins on the gpiochip can generate a unique IRQ. Everything else
+ * need to be open coded.
+ */
+int gpiochip_irqchip_add(struct gpio_chip *gpiochip,
+ struct irq_chip *irqchip,
+ unsigned int first_irq,
+ irq_flow_handler_t handler,
+ unsigned int type)
+{
+ struct device_node *of_node;
+ unsigned int offset;
+ unsigned irq_base = 0;
+
+ if (!gpiochip || !irqchip)
+ return -EINVAL;
+
+ if (!gpiochip->dev) {
+ pr_err("missing gpiochip .dev parent pointer\n");
+ return -EINVAL;
+ }
+ of_node = gpiochip->dev->of_node;
+#ifdef CONFIG_OF_GPIO
+ /*
+ * If the gpiochip has an assigned OF node this takes precendence
+ * FIXME: get rid of this and use gpiochip->dev->of_node everywhere
+ */
+ if (gpiochip->of_node)
+ of_node = gpiochip->of_node;
+#endif
+ gpiochip->irqchip = irqchip;
+ gpiochip->irq_handler = handler;
+ gpiochip->irq_default_type = type;
+ gpiochip->to_irq = gpiochip_to_irq;
+ gpiochip->irqdomain = irq_domain_add_simple(of_node,
+ gpiochip->ngpio, first_irq,
+ &gpiochip_domain_ops, gpiochip);
+ if (!gpiochip->irqdomain) {
+ gpiochip->irqchip = NULL;
+ return -EINVAL;
+ }
+ irqchip->irq_request_resources = gpiochip_irq_reqres;
+ irqchip->irq_release_resources = gpiochip_irq_relres;
+
+ /*
+ * Prepare the mapping since the irqchip shall be orthogonal to
+ * any gpiochip calls. If the first_irq was zero, this is
+ * necessary to allocate descriptors for all IRQs.
+ */
+ for (offset = 0; offset < gpiochip->ngpio; offset++) {
+ irq_base = irq_create_mapping(gpiochip->irqdomain, offset);
+ if (offset == 0)
+ /*
+ * Store the base into the gpiochip to be used when
+ * unmapping the irqs.
+ */
+ gpiochip->irq_base = irq_base;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(gpiochip_irqchip_add);
+
+#else /* CONFIG_GPIOLIB_IRQCHIP */
+
+static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) {}
+
+#endif /* CONFIG_GPIOLIB_IRQCHIP */
+
#ifdef CONFIG_PINCTRL
/**
* 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(struct gpio_desc *desc, const char *label)
{
- struct gpio_chip *chip;
- int status = -EPROBE_DEFER;
+ struct gpio_chip *chip = desc->chip;
+ int status;
unsigned long flags;
- if (!desc) {
- pr_warn("%s: invalid GPIO\n", __func__);
- return -EINVAL;
- }
-
spin_lock_irqsave(&gpio_lock, flags);
- chip = desc->chip;
- if (chip == NULL)
- goto done;
-
- if (!try_module_get(chip->owner))
- goto done;
-
/* NOTE: gpio_request() can be called in early boot,
* before IRQs are enabled, for non-sleeping (SOC) GPIOs.
*/
status = 0;
} else {
status = -EBUSY;
- module_put(chip->owner);
goto done;
}
if (status < 0) {
desc_set_label(desc, NULL);
- module_put(chip->owner);
clear_bit(FLAG_REQUESTED, &desc->flags);
goto done;
}
gpiod_get_direction(desc);
spin_lock_irqsave(&gpio_lock, flags);
}
+done:
+ spin_unlock_irqrestore(&gpio_lock, flags);
+ return status;
+}
+
+static int gpiod_request(struct gpio_desc *desc, const char *label)
+{
+ int status = -EPROBE_DEFER;
+ struct gpio_chip *chip;
+
+ if (!desc) {
+ pr_warn("%s: invalid GPIO\n", __func__);
+ return -EINVAL;
+ }
+
+ chip = desc->chip;
+ if (!chip)
+ goto done;
+
+ if (try_module_get(chip->owner)) {
+ status = __gpiod_request(desc, label);
+ if (status < 0)
+ module_put(chip->owner);
+ }
+
done:
if (status)
gpiod_dbg(desc, "%s: status %d\n", __func__, status);
- spin_unlock_irqrestore(&gpio_lock, flags);
+
return status;
}
}
EXPORT_SYMBOL_GPL(gpio_request);
-static void gpiod_free(struct gpio_desc *desc)
+static bool __gpiod_free(struct gpio_desc *desc)
{
+ bool ret = false;
unsigned long flags;
struct gpio_chip *chip;
might_sleep();
- if (!desc) {
- WARN_ON(extra_checks);
- return;
- }
-
gpiod_unexport(desc);
spin_lock_irqsave(&gpio_lock, flags);
spin_lock_irqsave(&gpio_lock, flags);
}
desc_set_label(desc, NULL);
- module_put(desc->chip->owner);
clear_bit(FLAG_ACTIVE_LOW, &desc->flags);
clear_bit(FLAG_REQUESTED, &desc->flags);
clear_bit(FLAG_OPEN_DRAIN, &desc->flags);
clear_bit(FLAG_OPEN_SOURCE, &desc->flags);
- } else
- WARN_ON(extra_checks);
+ ret = true;
+ }
spin_unlock_irqrestore(&gpio_lock, flags);
+ return ret;
+}
+
+static void gpiod_free(struct gpio_desc *desc)
+{
+ if (desc && __gpiod_free(desc))
+ module_put(desc->chip->owner);
+ else
+ WARN_ON(extra_checks);
}
void gpio_free(unsigned gpio)
if (flags & GPIOF_DIR_IN)
err = gpiod_direction_input(desc);
else
- err = gpiod_direction_output(desc,
+ err = gpiod_direction_output_raw(desc,
(flags & GPIOF_INIT_HIGH) ? 1 : 0);
if (err)
}
EXPORT_SYMBOL_GPL(gpiochip_is_requested);
+/**
+ * gpiochip_request_own_desc - Allow GPIO chip to request its own descriptor
+ * @desc: GPIO descriptor to request
+ * @label: label for the GPIO
+ *
+ * Function allows GPIO chip drivers to request and use their own GPIO
+ * descriptors via gpiolib API. Difference to gpiod_request() is that this
+ * function will not increase reference count of the GPIO chip module. This
+ * allows the GPIO chip module to be unloaded as needed (we assume that the
+ * GPIO chip driver handles freeing the GPIOs it has requested).
+ */
+int gpiochip_request_own_desc(struct gpio_desc *desc, const char *label)
+{
+ if (!desc || !desc->chip)
+ return -EINVAL;
+
+ return __gpiod_request(desc, label);
+}
+
+/**
+ * gpiochip_free_own_desc - Free GPIO requested by the chip driver
+ * @desc: GPIO descriptor to free
+ *
+ * Function frees the given GPIO requested previously with
+ * gpiochip_request_own_desc().
+ */
+void gpiochip_free_own_desc(struct gpio_desc *desc)
+{
+ if (desc)
+ __gpiod_free(desc);
+}
/* Drivers MUST set GPIO direction before making get/set calls. In
* some cases this is done in early boot, before IRQs are enabled.
}
EXPORT_SYMBOL_GPL(gpiod_direction_input);
-/**
- * gpiod_direction_output - set the GPIO direction to input
- * @desc: GPIO to set to output
- * @value: initial output value of the GPIO
- *
- * Set the direction of the passed GPIO to output, such as gpiod_set_value() can
- * be called safely on it. The initial value of the output must be specified.
- *
- * Return 0 in case of success, else an error code.
- */
-int gpiod_direction_output(struct gpio_desc *desc, int value)
+static int _gpiod_direction_output_raw(struct gpio_desc *desc, int value)
{
unsigned long flags;
struct gpio_chip *chip;
int status = -EINVAL;
int offset;
- if (!desc || !desc->chip) {
- pr_warn("%s: invalid GPIO\n", __func__);
- return -EINVAL;
- }
-
/* GPIOs used for IRQs shall not be set as output */
if (test_bit(FLAG_USED_AS_IRQ, &desc->flags)) {
gpiod_err(desc,
gpiod_dbg(desc, "%s: gpio status %d\n", __func__, status);
return status;
}
+
+/**
+ * gpiod_direction_output_raw - set the GPIO direction to output
+ * @desc: GPIO to set to output
+ * @value: initial output value of the GPIO
+ *
+ * Set the direction of the passed GPIO to output, such as gpiod_set_value() can
+ * be called safely on it. The initial value of the output must be specified
+ * as raw value on the physical line without regard for the ACTIVE_LOW status.
+ *
+ * Return 0 in case of success, else an error code.
+ */
+int gpiod_direction_output_raw(struct gpio_desc *desc, int value)
+{
+ if (!desc || !desc->chip) {
+ pr_warn("%s: invalid GPIO\n", __func__);
+ return -EINVAL;
+ }
+ return _gpiod_direction_output_raw(desc, value);
+}
+EXPORT_SYMBOL_GPL(gpiod_direction_output_raw);
+
+/**
+ * gpiod_direction_output - set the GPIO direction to output
+ * @desc: GPIO to set to output
+ * @value: initial output value of the GPIO
+ *
+ * Set the direction of the passed GPIO to output, such as gpiod_set_value() can
+ * be called safely on it. The initial value of the output must be specified
+ * as the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into
+ * account.
+ *
+ * Return 0 in case of success, else an error code.
+ */
+int gpiod_direction_output(struct gpio_desc *desc, int value)
+{
+ if (!desc || !desc->chip) {
+ pr_warn("%s: invalid GPIO\n", __func__);
+ return -EINVAL;
+ }
+ if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
+ value = !value;
+ return _gpiod_direction_output_raw(desc, value);
+}
EXPORT_SYMBOL_GPL(gpiod_direction_output);
/**
* that the GPIO was actually requested.
*/
-static int _gpiod_get_raw_value(const struct gpio_desc *desc)
+static bool _gpiod_get_raw_value(const struct gpio_desc *desc)
{
struct gpio_chip *chip;
- int value;
+ bool value;
int offset;
chip = desc->chip;
offset = gpio_chip_hwgpio(desc);
- value = chip->get ? chip->get(chip, offset) : 0;
+ value = chip->get ? chip->get(chip, offset) : false;
trace_gpio_value(desc_to_gpio(desc), 1, value);
return value;
}
* @desc: gpio descriptor whose state need to be set.
* @value: Non-zero for setting it HIGH otherise it will set to LOW.
*/
-static void _gpio_set_open_drain_value(struct gpio_desc *desc, int value)
+static void _gpio_set_open_drain_value(struct gpio_desc *desc, bool value)
{
int err = 0;
struct gpio_chip *chip = desc->chip;
* @desc: gpio descriptor whose state need to be set.
* @value: Non-zero for setting it HIGH otherise it will set to LOW.
*/
-static void _gpio_set_open_source_value(struct gpio_desc *desc, int value)
+static void _gpio_set_open_source_value(struct gpio_desc *desc, bool value)
{
int err = 0;
struct gpio_chip *chip = desc->chip;
__func__, err);
}
-static void _gpiod_set_raw_value(struct gpio_desc *desc, int value)
+static void _gpiod_set_raw_value(struct gpio_desc *desc, bool value)
{
struct gpio_chip *chip;
* @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.
+ * a certain GPIO line to be used for IRQs.
*/
int gpiod_lock_as_irq(struct gpio_desc *desc)
{
int gpio_lock_as_irq(struct gpio_chip *chip, unsigned int offset)
{
- return gpiod_lock_as_irq(gpiochip_offset_to_desc(chip, offset));
+ return gpiod_lock_as_irq(gpiochip_get_desc(chip, offset));
}
EXPORT_SYMBOL_GPL(gpio_lock_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));
+ return gpiod_unlock_as_irq(gpiochip_get_desc(chip, offset));
}
EXPORT_SYMBOL_GPL(gpio_unlock_as_irq);
return ERR_PTR(-EINVAL);
}
- desc = gpiochip_offset_to_desc(chip, p->chip_hwnum);
+ desc = gpiochip_get_desc(chip, p->chip_hwnum);
*flags = p->flags;
return desc;
projects / firefly-linux-kernel-4.4.55.git / blobdiff