mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 11:19:37 +00:00
![Qipeng Zha](/assets/img/avatar_default.png)
The signed error will be wrongly used as valid gpio offset Reported-by: David Binderman <dcb314@hotmail.com> Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Qipeng Zha <qipeng.zha@intel.com> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
808 lines
20 KiB
C
808 lines
20 KiB
C
/*
|
|
* ACPI helpers for GPIO API
|
|
*
|
|
* Copyright (C) 2012, Intel Corporation
|
|
* Authors: Mathias Nyman <mathias.nyman@linux.intel.com>
|
|
* Mika Westerberg <mika.westerberg@linux.intel.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/gpio/consumer.h>
|
|
#include <linux/gpio/driver.h>
|
|
#include <linux/export.h>
|
|
#include <linux/acpi.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/pinctrl/pinctrl.h>
|
|
|
|
#include "gpiolib.h"
|
|
|
|
struct acpi_gpio_event {
|
|
struct list_head node;
|
|
acpi_handle handle;
|
|
unsigned int pin;
|
|
unsigned int irq;
|
|
struct gpio_desc *desc;
|
|
};
|
|
|
|
struct acpi_gpio_connection {
|
|
struct list_head node;
|
|
unsigned int pin;
|
|
struct gpio_desc *desc;
|
|
};
|
|
|
|
struct acpi_gpio_chip {
|
|
/*
|
|
* ACPICA requires that the first field of the context parameter
|
|
* passed to acpi_install_address_space_handler() is large enough
|
|
* to hold struct acpi_connection_info.
|
|
*/
|
|
struct acpi_connection_info conn_info;
|
|
struct list_head conns;
|
|
struct mutex conn_lock;
|
|
struct gpio_chip *chip;
|
|
struct list_head events;
|
|
};
|
|
|
|
static int acpi_gpiochip_find(struct gpio_chip *gc, void *data)
|
|
{
|
|
if (!gc->dev)
|
|
return false;
|
|
|
|
return ACPI_HANDLE(gc->dev) == data;
|
|
}
|
|
|
|
#ifdef CONFIG_PINCTRL
|
|
/**
|
|
* acpi_gpiochip_pin_to_gpio_offset() - translates ACPI GPIO to Linux GPIO
|
|
* @chip: GPIO chip
|
|
* @pin: ACPI GPIO pin number from GpioIo/GpioInt resource
|
|
*
|
|
* Function takes ACPI GpioIo/GpioInt pin number as a parameter and
|
|
* translates it to a corresponding offset suitable to be passed to a
|
|
* GPIO controller driver.
|
|
*
|
|
* Typically the returned offset is same as @pin, but if the GPIO
|
|
* controller uses pin controller and the mapping is not contigous the
|
|
* offset might be different.
|
|
*/
|
|
static int acpi_gpiochip_pin_to_gpio_offset(struct gpio_chip *chip, int pin)
|
|
{
|
|
struct gpio_pin_range *pin_range;
|
|
|
|
/* If there are no ranges in this chip, use 1:1 mapping */
|
|
if (list_empty(&chip->pin_ranges))
|
|
return pin;
|
|
|
|
list_for_each_entry(pin_range, &chip->pin_ranges, node) {
|
|
const struct pinctrl_gpio_range *range = &pin_range->range;
|
|
int i;
|
|
|
|
if (range->pins) {
|
|
for (i = 0; i < range->npins; i++) {
|
|
if (range->pins[i] == pin)
|
|
return range->base + i - chip->base;
|
|
}
|
|
} else {
|
|
if (pin >= range->pin_base &&
|
|
pin < range->pin_base + range->npins) {
|
|
unsigned gpio_base;
|
|
|
|
gpio_base = range->base - chip->base;
|
|
return gpio_base + pin - range->pin_base;
|
|
}
|
|
}
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
#else
|
|
static inline int acpi_gpiochip_pin_to_gpio_offset(struct gpio_chip *chip,
|
|
int pin)
|
|
{
|
|
return pin;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with GPIO API
|
|
* @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1")
|
|
* @pin: ACPI GPIO pin number (0-based, controller-relative)
|
|
*
|
|
* Returns GPIO descriptor to use with Linux generic GPIO API, or ERR_PTR
|
|
* error value
|
|
*/
|
|
|
|
static struct gpio_desc *acpi_get_gpiod(char *path, int pin)
|
|
{
|
|
struct gpio_chip *chip;
|
|
acpi_handle handle;
|
|
acpi_status status;
|
|
int offset;
|
|
|
|
status = acpi_get_handle(NULL, path, &handle);
|
|
if (ACPI_FAILURE(status))
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
chip = gpiochip_find(handle, acpi_gpiochip_find);
|
|
if (!chip)
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
offset = acpi_gpiochip_pin_to_gpio_offset(chip, pin);
|
|
if (offset < 0)
|
|
return ERR_PTR(offset);
|
|
|
|
return gpiochip_get_desc(chip, offset);
|
|
}
|
|
|
|
static irqreturn_t acpi_gpio_irq_handler(int irq, void *data)
|
|
{
|
|
struct acpi_gpio_event *event = data;
|
|
|
|
acpi_evaluate_object(event->handle, NULL, NULL, NULL);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t acpi_gpio_irq_handler_evt(int irq, void *data)
|
|
{
|
|
struct acpi_gpio_event *event = data;
|
|
|
|
acpi_execute_simple_method(event->handle, NULL, event->pin);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void acpi_gpio_chip_dh(acpi_handle handle, void *data)
|
|
{
|
|
/* The address of this function is used as a key. */
|
|
}
|
|
|
|
static acpi_status acpi_gpiochip_request_interrupt(struct acpi_resource *ares,
|
|
void *context)
|
|
{
|
|
struct acpi_gpio_chip *acpi_gpio = context;
|
|
struct gpio_chip *chip = acpi_gpio->chip;
|
|
struct acpi_resource_gpio *agpio;
|
|
acpi_handle handle, evt_handle;
|
|
struct acpi_gpio_event *event;
|
|
irq_handler_t handler = NULL;
|
|
struct gpio_desc *desc;
|
|
unsigned long irqflags;
|
|
int ret, pin, irq;
|
|
|
|
if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
|
|
return AE_OK;
|
|
|
|
agpio = &ares->data.gpio;
|
|
if (agpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_INT)
|
|
return AE_OK;
|
|
|
|
handle = ACPI_HANDLE(chip->dev);
|
|
pin = agpio->pin_table[0];
|
|
|
|
if (pin <= 255) {
|
|
char ev_name[5];
|
|
sprintf(ev_name, "_%c%02X",
|
|
agpio->triggering == ACPI_EDGE_SENSITIVE ? 'E' : 'L',
|
|
pin);
|
|
if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle)))
|
|
handler = acpi_gpio_irq_handler;
|
|
}
|
|
if (!handler) {
|
|
if (ACPI_SUCCESS(acpi_get_handle(handle, "_EVT", &evt_handle)))
|
|
handler = acpi_gpio_irq_handler_evt;
|
|
}
|
|
if (!handler)
|
|
return AE_BAD_PARAMETER;
|
|
|
|
pin = acpi_gpiochip_pin_to_gpio_offset(chip, pin);
|
|
if (pin < 0)
|
|
return AE_BAD_PARAMETER;
|
|
|
|
desc = gpiochip_request_own_desc(chip, pin, "ACPI:Event");
|
|
if (IS_ERR(desc)) {
|
|
dev_err(chip->dev, "Failed to request GPIO\n");
|
|
return AE_ERROR;
|
|
}
|
|
|
|
gpiod_direction_input(desc);
|
|
|
|
ret = gpiochip_lock_as_irq(chip, pin);
|
|
if (ret) {
|
|
dev_err(chip->dev, "Failed to lock GPIO as interrupt\n");
|
|
goto fail_free_desc;
|
|
}
|
|
|
|
irq = gpiod_to_irq(desc);
|
|
if (irq < 0) {
|
|
dev_err(chip->dev, "Failed to translate GPIO to IRQ\n");
|
|
goto fail_unlock_irq;
|
|
}
|
|
|
|
irqflags = IRQF_ONESHOT;
|
|
if (agpio->triggering == ACPI_LEVEL_SENSITIVE) {
|
|
if (agpio->polarity == ACPI_ACTIVE_HIGH)
|
|
irqflags |= IRQF_TRIGGER_HIGH;
|
|
else
|
|
irqflags |= IRQF_TRIGGER_LOW;
|
|
} else {
|
|
switch (agpio->polarity) {
|
|
case ACPI_ACTIVE_HIGH:
|
|
irqflags |= IRQF_TRIGGER_RISING;
|
|
break;
|
|
case ACPI_ACTIVE_LOW:
|
|
irqflags |= IRQF_TRIGGER_FALLING;
|
|
break;
|
|
default:
|
|
irqflags |= IRQF_TRIGGER_RISING |
|
|
IRQF_TRIGGER_FALLING;
|
|
break;
|
|
}
|
|
}
|
|
|
|
event = kzalloc(sizeof(*event), GFP_KERNEL);
|
|
if (!event)
|
|
goto fail_unlock_irq;
|
|
|
|
event->handle = evt_handle;
|
|
event->irq = irq;
|
|
event->pin = pin;
|
|
event->desc = desc;
|
|
|
|
ret = request_threaded_irq(event->irq, NULL, handler, irqflags,
|
|
"ACPI:Event", event);
|
|
if (ret) {
|
|
dev_err(chip->dev, "Failed to setup interrupt handler for %d\n",
|
|
event->irq);
|
|
goto fail_free_event;
|
|
}
|
|
|
|
list_add_tail(&event->node, &acpi_gpio->events);
|
|
return AE_OK;
|
|
|
|
fail_free_event:
|
|
kfree(event);
|
|
fail_unlock_irq:
|
|
gpiochip_unlock_as_irq(chip, pin);
|
|
fail_free_desc:
|
|
gpiochip_free_own_desc(desc);
|
|
|
|
return AE_ERROR;
|
|
}
|
|
|
|
/**
|
|
* acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events
|
|
* @chip: GPIO chip
|
|
*
|
|
* ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are
|
|
* handled by ACPI event methods which need to be called from the GPIO
|
|
* chip's interrupt handler. acpi_gpiochip_request_interrupts finds out which
|
|
* gpio pins have acpi event methods and assigns interrupt handlers that calls
|
|
* the acpi event methods for those pins.
|
|
*/
|
|
void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
|
|
{
|
|
struct acpi_gpio_chip *acpi_gpio;
|
|
acpi_handle handle;
|
|
acpi_status status;
|
|
|
|
if (!chip->dev || !chip->to_irq)
|
|
return;
|
|
|
|
handle = ACPI_HANDLE(chip->dev);
|
|
if (!handle)
|
|
return;
|
|
|
|
status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
|
|
if (ACPI_FAILURE(status))
|
|
return;
|
|
|
|
INIT_LIST_HEAD(&acpi_gpio->events);
|
|
acpi_walk_resources(handle, "_AEI",
|
|
acpi_gpiochip_request_interrupt, acpi_gpio);
|
|
}
|
|
|
|
/**
|
|
* acpi_gpiochip_free_interrupts() - Free GPIO ACPI event interrupts.
|
|
* @chip: GPIO chip
|
|
*
|
|
* Free interrupts associated with GPIO ACPI event method for the given
|
|
* GPIO chip.
|
|
*/
|
|
void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
|
|
{
|
|
struct acpi_gpio_chip *acpi_gpio;
|
|
struct acpi_gpio_event *event, *ep;
|
|
acpi_handle handle;
|
|
acpi_status status;
|
|
|
|
if (!chip->dev || !chip->to_irq)
|
|
return;
|
|
|
|
handle = ACPI_HANDLE(chip->dev);
|
|
if (!handle)
|
|
return;
|
|
|
|
status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
|
|
if (ACPI_FAILURE(status))
|
|
return;
|
|
|
|
list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) {
|
|
struct gpio_desc *desc;
|
|
|
|
free_irq(event->irq, event);
|
|
desc = event->desc;
|
|
if (WARN_ON(IS_ERR(desc)))
|
|
continue;
|
|
gpiochip_unlock_as_irq(chip, event->pin);
|
|
gpiochip_free_own_desc(desc);
|
|
list_del(&event->node);
|
|
kfree(event);
|
|
}
|
|
}
|
|
|
|
int acpi_dev_add_driver_gpios(struct acpi_device *adev,
|
|
const struct acpi_gpio_mapping *gpios)
|
|
{
|
|
if (adev && gpios) {
|
|
adev->driver_gpios = gpios;
|
|
return 0;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_dev_add_driver_gpios);
|
|
|
|
static bool acpi_get_driver_gpio_data(struct acpi_device *adev,
|
|
const char *name, int index,
|
|
struct acpi_reference_args *args)
|
|
{
|
|
const struct acpi_gpio_mapping *gm;
|
|
|
|
if (!adev->driver_gpios)
|
|
return false;
|
|
|
|
for (gm = adev->driver_gpios; gm->name; gm++)
|
|
if (!strcmp(name, gm->name) && gm->data && index < gm->size) {
|
|
const struct acpi_gpio_params *par = gm->data + index;
|
|
|
|
args->adev = adev;
|
|
args->args[0] = par->crs_entry_index;
|
|
args->args[1] = par->line_index;
|
|
args->args[2] = par->active_low;
|
|
args->nargs = 3;
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
struct acpi_gpio_lookup {
|
|
struct acpi_gpio_info info;
|
|
int index;
|
|
int pin_index;
|
|
struct gpio_desc *desc;
|
|
int n;
|
|
};
|
|
|
|
static int acpi_find_gpio(struct acpi_resource *ares, void *data)
|
|
{
|
|
struct acpi_gpio_lookup *lookup = data;
|
|
|
|
if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
|
|
return 1;
|
|
|
|
if (lookup->n++ == lookup->index && !lookup->desc) {
|
|
const struct acpi_resource_gpio *agpio = &ares->data.gpio;
|
|
int pin_index = lookup->pin_index;
|
|
|
|
if (pin_index >= agpio->pin_table_length)
|
|
return 1;
|
|
|
|
lookup->desc = acpi_get_gpiod(agpio->resource_source.string_ptr,
|
|
agpio->pin_table[pin_index]);
|
|
lookup->info.gpioint =
|
|
agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT;
|
|
|
|
/*
|
|
* ActiveLow is only specified for GpioInt resource. If
|
|
* GpioIo is used then the only way to set the flag is
|
|
* to use _DSD "gpios" property.
|
|
*/
|
|
if (lookup->info.gpioint)
|
|
lookup->info.active_low =
|
|
agpio->polarity == ACPI_ACTIVE_LOW;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources
|
|
* @adev: pointer to a ACPI device to get GPIO from
|
|
* @propname: Property name of the GPIO (optional)
|
|
* @index: index of GpioIo/GpioInt resource (starting from %0)
|
|
* @info: info pointer to fill in (optional)
|
|
*
|
|
* Function goes through ACPI resources for @adev and based on @index looks
|
|
* up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor,
|
|
* and returns it. @index matches GpioIo/GpioInt resources only so if there
|
|
* are total %3 GPIO resources, the index goes from %0 to %2.
|
|
*
|
|
* If @propname is specified the GPIO is looked using device property. In
|
|
* that case @index is used to select the GPIO entry in the property value
|
|
* (in case of multiple).
|
|
*
|
|
* If the GPIO cannot be translated or there is an error an ERR_PTR is
|
|
* returned.
|
|
*
|
|
* Note: if the GPIO resource has multiple entries in the pin list, this
|
|
* function only returns the first.
|
|
*/
|
|
struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
|
|
const char *propname, int index,
|
|
struct acpi_gpio_info *info)
|
|
{
|
|
struct acpi_gpio_lookup lookup;
|
|
struct list_head resource_list;
|
|
bool active_low = false;
|
|
int ret;
|
|
|
|
if (!adev)
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
memset(&lookup, 0, sizeof(lookup));
|
|
lookup.index = index;
|
|
|
|
if (propname) {
|
|
struct acpi_reference_args args;
|
|
|
|
dev_dbg(&adev->dev, "GPIO: looking up %s\n", propname);
|
|
|
|
memset(&args, 0, sizeof(args));
|
|
ret = acpi_dev_get_property_reference(adev, propname,
|
|
index, &args);
|
|
if (ret) {
|
|
bool found = acpi_get_driver_gpio_data(adev, propname,
|
|
index, &args);
|
|
if (!found)
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
/*
|
|
* The property was found and resolved so need to
|
|
* lookup the GPIO based on returned args instead.
|
|
*/
|
|
adev = args.adev;
|
|
if (args.nargs >= 2) {
|
|
lookup.index = args.args[0];
|
|
lookup.pin_index = args.args[1];
|
|
/*
|
|
* 3rd argument, if present is used to
|
|
* specify active_low.
|
|
*/
|
|
if (args.nargs >= 3)
|
|
active_low = !!args.args[2];
|
|
}
|
|
|
|
dev_dbg(&adev->dev, "GPIO: _DSD returned %s %zd %llu %llu %llu\n",
|
|
dev_name(&adev->dev), args.nargs,
|
|
args.args[0], args.args[1], args.args[2]);
|
|
} else {
|
|
dev_dbg(&adev->dev, "GPIO: looking up %d in _CRS\n", index);
|
|
}
|
|
|
|
INIT_LIST_HEAD(&resource_list);
|
|
ret = acpi_dev_get_resources(adev, &resource_list, acpi_find_gpio,
|
|
&lookup);
|
|
if (ret < 0)
|
|
return ERR_PTR(ret);
|
|
|
|
acpi_dev_free_resource_list(&resource_list);
|
|
|
|
if (lookup.desc && info) {
|
|
*info = lookup.info;
|
|
if (active_low)
|
|
info->active_low = active_low;
|
|
}
|
|
|
|
return lookup.desc ? lookup.desc : ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
static acpi_status
|
|
acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
|
|
u32 bits, u64 *value, void *handler_context,
|
|
void *region_context)
|
|
{
|
|
struct acpi_gpio_chip *achip = region_context;
|
|
struct gpio_chip *chip = achip->chip;
|
|
struct acpi_resource_gpio *agpio;
|
|
struct acpi_resource *ares;
|
|
int pin_index = (int)address;
|
|
acpi_status status;
|
|
bool pull_up;
|
|
int length;
|
|
int i;
|
|
|
|
status = acpi_buffer_to_resource(achip->conn_info.connection,
|
|
achip->conn_info.length, &ares);
|
|
if (ACPI_FAILURE(status))
|
|
return status;
|
|
|
|
if (WARN_ON(ares->type != ACPI_RESOURCE_TYPE_GPIO)) {
|
|
ACPI_FREE(ares);
|
|
return AE_BAD_PARAMETER;
|
|
}
|
|
|
|
agpio = &ares->data.gpio;
|
|
pull_up = agpio->pin_config == ACPI_PIN_CONFIG_PULLUP;
|
|
|
|
if (WARN_ON(agpio->io_restriction == ACPI_IO_RESTRICT_INPUT &&
|
|
function == ACPI_WRITE)) {
|
|
ACPI_FREE(ares);
|
|
return AE_BAD_PARAMETER;
|
|
}
|
|
|
|
length = min(agpio->pin_table_length, (u16)(pin_index + bits));
|
|
for (i = pin_index; i < length; ++i) {
|
|
int pin = agpio->pin_table[i];
|
|
struct acpi_gpio_connection *conn;
|
|
struct gpio_desc *desc;
|
|
bool found;
|
|
|
|
pin = acpi_gpiochip_pin_to_gpio_offset(chip, pin);
|
|
if (pin < 0) {
|
|
status = AE_BAD_PARAMETER;
|
|
goto out;
|
|
}
|
|
|
|
mutex_lock(&achip->conn_lock);
|
|
|
|
found = false;
|
|
list_for_each_entry(conn, &achip->conns, node) {
|
|
if (conn->pin == pin) {
|
|
found = true;
|
|
desc = conn->desc;
|
|
break;
|
|
}
|
|
}
|
|
if (!found) {
|
|
desc = gpiochip_request_own_desc(chip, pin,
|
|
"ACPI:OpRegion");
|
|
if (IS_ERR(desc)) {
|
|
status = AE_ERROR;
|
|
mutex_unlock(&achip->conn_lock);
|
|
goto out;
|
|
}
|
|
|
|
switch (agpio->io_restriction) {
|
|
case ACPI_IO_RESTRICT_INPUT:
|
|
gpiod_direction_input(desc);
|
|
break;
|
|
case ACPI_IO_RESTRICT_OUTPUT:
|
|
/*
|
|
* ACPI GPIO resources don't contain an
|
|
* initial value for the GPIO. Therefore we
|
|
* deduce that value from the pull field
|
|
* instead. If the pin is pulled up we
|
|
* assume default to be high, otherwise
|
|
* low.
|
|
*/
|
|
gpiod_direction_output(desc, pull_up);
|
|
break;
|
|
default:
|
|
/*
|
|
* Assume that the BIOS has configured the
|
|
* direction and pull accordingly.
|
|
*/
|
|
break;
|
|
}
|
|
|
|
conn = kzalloc(sizeof(*conn), GFP_KERNEL);
|
|
if (!conn) {
|
|
status = AE_NO_MEMORY;
|
|
gpiochip_free_own_desc(desc);
|
|
mutex_unlock(&achip->conn_lock);
|
|
goto out;
|
|
}
|
|
|
|
conn->pin = pin;
|
|
conn->desc = desc;
|
|
list_add_tail(&conn->node, &achip->conns);
|
|
}
|
|
|
|
mutex_unlock(&achip->conn_lock);
|
|
|
|
if (function == ACPI_WRITE)
|
|
gpiod_set_raw_value_cansleep(desc,
|
|
!!((1 << i) & *value));
|
|
else
|
|
*value |= (u64)gpiod_get_raw_value_cansleep(desc) << i;
|
|
}
|
|
|
|
out:
|
|
ACPI_FREE(ares);
|
|
return status;
|
|
}
|
|
|
|
static void acpi_gpiochip_request_regions(struct acpi_gpio_chip *achip)
|
|
{
|
|
struct gpio_chip *chip = achip->chip;
|
|
acpi_handle handle = ACPI_HANDLE(chip->dev);
|
|
acpi_status status;
|
|
|
|
INIT_LIST_HEAD(&achip->conns);
|
|
mutex_init(&achip->conn_lock);
|
|
status = acpi_install_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
|
|
acpi_gpio_adr_space_handler,
|
|
NULL, achip);
|
|
if (ACPI_FAILURE(status))
|
|
dev_err(chip->dev, "Failed to install GPIO OpRegion handler\n");
|
|
}
|
|
|
|
static void acpi_gpiochip_free_regions(struct acpi_gpio_chip *achip)
|
|
{
|
|
struct gpio_chip *chip = achip->chip;
|
|
acpi_handle handle = ACPI_HANDLE(chip->dev);
|
|
struct acpi_gpio_connection *conn, *tmp;
|
|
acpi_status status;
|
|
|
|
status = acpi_remove_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
|
|
acpi_gpio_adr_space_handler);
|
|
if (ACPI_FAILURE(status)) {
|
|
dev_err(chip->dev, "Failed to remove GPIO OpRegion handler\n");
|
|
return;
|
|
}
|
|
|
|
list_for_each_entry_safe_reverse(conn, tmp, &achip->conns, node) {
|
|
gpiochip_free_own_desc(conn->desc);
|
|
list_del(&conn->node);
|
|
kfree(conn);
|
|
}
|
|
}
|
|
|
|
void acpi_gpiochip_add(struct gpio_chip *chip)
|
|
{
|
|
struct acpi_gpio_chip *acpi_gpio;
|
|
acpi_handle handle;
|
|
acpi_status status;
|
|
|
|
if (!chip || !chip->dev)
|
|
return;
|
|
|
|
handle = ACPI_HANDLE(chip->dev);
|
|
if (!handle)
|
|
return;
|
|
|
|
acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL);
|
|
if (!acpi_gpio) {
|
|
dev_err(chip->dev,
|
|
"Failed to allocate memory for ACPI GPIO chip\n");
|
|
return;
|
|
}
|
|
|
|
acpi_gpio->chip = chip;
|
|
|
|
status = acpi_attach_data(handle, acpi_gpio_chip_dh, acpi_gpio);
|
|
if (ACPI_FAILURE(status)) {
|
|
dev_err(chip->dev, "Failed to attach ACPI GPIO chip\n");
|
|
kfree(acpi_gpio);
|
|
return;
|
|
}
|
|
|
|
acpi_gpiochip_request_regions(acpi_gpio);
|
|
}
|
|
|
|
void acpi_gpiochip_remove(struct gpio_chip *chip)
|
|
{
|
|
struct acpi_gpio_chip *acpi_gpio;
|
|
acpi_handle handle;
|
|
acpi_status status;
|
|
|
|
if (!chip || !chip->dev)
|
|
return;
|
|
|
|
handle = ACPI_HANDLE(chip->dev);
|
|
if (!handle)
|
|
return;
|
|
|
|
status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
|
|
if (ACPI_FAILURE(status)) {
|
|
dev_warn(chip->dev, "Failed to retrieve ACPI GPIO chip\n");
|
|
return;
|
|
}
|
|
|
|
acpi_gpiochip_free_regions(acpi_gpio);
|
|
|
|
acpi_detach_data(handle, acpi_gpio_chip_dh);
|
|
kfree(acpi_gpio);
|
|
}
|
|
|
|
static unsigned int acpi_gpio_package_count(const union acpi_object *obj)
|
|
{
|
|
const union acpi_object *element = obj->package.elements;
|
|
const union acpi_object *end = element + obj->package.count;
|
|
unsigned int count = 0;
|
|
|
|
while (element < end) {
|
|
if (element->type == ACPI_TYPE_LOCAL_REFERENCE)
|
|
count++;
|
|
|
|
element++;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
static int acpi_find_gpio_count(struct acpi_resource *ares, void *data)
|
|
{
|
|
unsigned int *count = data;
|
|
|
|
if (ares->type == ACPI_RESOURCE_TYPE_GPIO)
|
|
*count += ares->data.gpio.pin_table_length;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* acpi_gpio_count - return the number of GPIOs associated with a
|
|
* device / function or -ENOENT if no GPIO has been
|
|
* assigned to the requested function.
|
|
* @dev: GPIO consumer, can be NULL for system-global GPIOs
|
|
* @con_id: function within the GPIO consumer
|
|
*/
|
|
int acpi_gpio_count(struct device *dev, const char *con_id)
|
|
{
|
|
struct acpi_device *adev = ACPI_COMPANION(dev);
|
|
const union acpi_object *obj;
|
|
const struct acpi_gpio_mapping *gm;
|
|
int count = -ENOENT;
|
|
int ret;
|
|
char propname[32];
|
|
unsigned int i;
|
|
|
|
/* Try first from _DSD */
|
|
for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
|
|
if (con_id && strcmp(con_id, "gpios"))
|
|
snprintf(propname, sizeof(propname), "%s-%s",
|
|
con_id, gpio_suffixes[i]);
|
|
else
|
|
snprintf(propname, sizeof(propname), "%s",
|
|
gpio_suffixes[i]);
|
|
|
|
ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_ANY,
|
|
&obj);
|
|
if (ret == 0) {
|
|
if (obj->type == ACPI_TYPE_LOCAL_REFERENCE)
|
|
count = 1;
|
|
else if (obj->type == ACPI_TYPE_PACKAGE)
|
|
count = acpi_gpio_package_count(obj);
|
|
} else if (adev->driver_gpios) {
|
|
for (gm = adev->driver_gpios; gm->name; gm++)
|
|
if (strcmp(propname, gm->name) == 0) {
|
|
count = gm->size;
|
|
break;
|
|
}
|
|
}
|
|
if (count >= 0)
|
|
break;
|
|
}
|
|
|
|
/* Then from plain _CRS GPIOs */
|
|
if (count < 0) {
|
|
struct list_head resource_list;
|
|
unsigned int crs_count = 0;
|
|
|
|
INIT_LIST_HEAD(&resource_list);
|
|
acpi_dev_get_resources(adev, &resource_list,
|
|
acpi_find_gpio_count, &crs_count);
|
|
acpi_dev_free_resource_list(&resource_list);
|
|
if (crs_count > 0)
|
|
count = crs_count;
|
|
}
|
|
return count;
|
|
}
|