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platform/x86: x86-android-tablets: Add support for PMIC interrupts

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The Crystal Cove PMIC has a pin which can be used to connect the IRQ of
an external charger IC. On some boards this is used so we need a way to
look this up.

Note that the Intel PMICs have 2 levels of interrupts and thus
2 levels of IRQ domains all tied to a single fwnode.

Level 1 is the irqchip which demultiplexes the actual PMIC interrupt into
interrupts for the various MFD cells. Level 2 are the irqchips used in the
cell drivers which themselves export IRQs, such as the crystal_cove_gpio
driver, which de-multiplexes the level 2 interrupts for the GPIOs into
individual per GPIO IRQs.

The crystal_cove_charger driver registers an irqchip with a single IRQ for
the charger driver to consume. Note the MFD cell IRQ cannot be consumed
directly because the level 2 interrupts must be explicitly acked.

To allow finding the right IRQ domain when looking up the IRQ for
the charger, the crystal_cove_charger driver sets a DOMAIN_BUS_WIRED token
on its IRQ domain.

Add support for looking up the IRQ from the crystal_cove_charger driver.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20211229231431.437982-6-hdegoede@redhat.com
This commit is contained in:
Hans de Goede 2021-12-30 00:14:24 +01:00
parent fc64a2b216
commit cd26465fbc
1 changed files with 30 additions and 1 deletions
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31
drivers/platform/x86/x86-android-tablets.c
View file

@ -17,6 +17,7 @@
#include <linux/gpio/machine.h>
#include <linux/i2c.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/string.h>
@ -31,11 +32,13 @@ enum x86_acpi_irq_type {
X86_ACPI_IRQ_TYPE_NONE,
X86_ACPI_IRQ_TYPE_APIC,
X86_ACPI_IRQ_TYPE_GPIOINT,
X86_ACPI_IRQ_TYPE_PMIC,
};
struct x86_acpi_irq_data {
char *chip; /* GPIO chip label (GPIOINT) */
char *chip; /* GPIO chip label (GPIOINT) or PMIC ACPI path (PMIC) */
enum x86_acpi_irq_type type;
enum irq_domain_bus_token domain;
int index;
int trigger; /* ACPI_EDGE_SENSITIVE / ACPI_LEVEL_SENSITIVE */
int polarity; /* ACPI_ACTIVE_HIGH / ACPI_ACTIVE_LOW / ACPI_ACTIVE_BOTH */
@ -48,9 +51,14 @@ static int x86_acpi_irq_helper_gpiochip_find(struct gpio_chip *gc, void *data)
static int x86_acpi_irq_helper_get(const struct x86_acpi_irq_data *data)
{
struct irq_fwspec fwspec = { };
struct irq_domain *domain;
struct acpi_device *adev;
struct gpio_desc *gpiod;
struct gpio_chip *chip;
unsigned int irq_type;
acpi_handle handle;
acpi_status status;
int irq, ret;
switch (data->type) {
@ -86,6 +94,27 @@ static int x86_acpi_irq_helper_get(const struct x86_acpi_irq_data *data)
irq_set_irq_type(irq, irq_type);
return irq;
case X86_ACPI_IRQ_TYPE_PMIC:
status = acpi_get_handle(NULL, data->chip, &handle);
if (ACPI_FAILURE(status)) {
pr_err("error could not get %s handle\n", data->chip);
return -ENODEV;
}
acpi_bus_get_device(handle, &adev);
if (!adev) {
pr_err("error could not get %s adev\n", data->chip);
return -ENODEV;
}
fwspec.fwnode = acpi_fwnode_handle(adev);
domain = irq_find_matching_fwspec(&fwspec, data->domain);
if (!domain) {
pr_err("error could not find IRQ domain for %s\n", data->chip);
return -ENODEV;
}
return irq_create_mapping(domain, data->index);
default:
return 0;
}