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-rw-r--r--drivers/gpio/Kconfig4
-rw-r--r--drivers/gpio/Makefile1
-rw-r--r--drivers/gpio/gpiolib-acpi.c54
-rw-r--r--drivers/spi/spi.c103
-rw-r--r--include/linux/acpi_gpio.h19
5 files changed, 180 insertions, 1 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 47150f5ded04..f16557690cfd 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -49,6 +49,10 @@ config OF_GPIO
def_bool y
depends on OF
+config GPIO_ACPI
+ def_bool y
+ depends on ACPI
+
config DEBUG_GPIO
bool "Debug GPIO calls"
depends on DEBUG_KERNEL
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 9aeed6707326..420dbaca05f1 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -4,6 +4,7 @@ ccflags-$(CONFIG_DEBUG_GPIO) += -DDEBUG
obj-$(CONFIG_GPIOLIB) += gpiolib.o devres.o
obj-$(CONFIG_OF_GPIO) += gpiolib-of.o
+obj-$(CONFIG_GPIO_ACPI) += gpiolib-acpi.o
# Device drivers. Generally keep list sorted alphabetically
obj-$(CONFIG_GPIO_GENERIC) += gpio-generic.o
diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
new file mode 100644
index 000000000000..cbad6e908d30
--- /dev/null
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -0,0 +1,54 @@
+/*
+ * 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/export.h>
+#include <linux/acpi_gpio.h>
+#include <linux/acpi.h>
+
+static int acpi_gpiochip_find(struct gpio_chip *gc, void *data)
+{
+ if (!gc->dev)
+ return false;
+
+ return ACPI_HANDLE(gc->dev) == data;
+}
+
+/**
+ * acpi_get_gpio() - Translate ACPI GPIO pin to GPIO number 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 number to use with Linux generic GPIO API, or errno error value
+ */
+
+int acpi_get_gpio(char *path, int pin)
+{
+ struct gpio_chip *chip;
+ acpi_handle handle;
+ acpi_status status;
+
+ status = acpi_get_handle(NULL, path, &handle);
+ if (ACPI_FAILURE(status))
+ return -ENODEV;
+
+ chip = gpiochip_find(handle, acpi_gpiochip_find);
+ if (!chip)
+ return -ENODEV;
+
+ if (!gpio_is_valid(chip->base + pin))
+ return -EINVAL;
+
+ return chip->base + pin;
+}
+EXPORT_SYMBOL_GPL(acpi_get_gpio);
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 84c2861d6f4d..1ab05234729f 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -35,6 +35,8 @@
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/kthread.h>
+#include <linux/ioport.h>
+#include <linux/acpi.h>
static void spidev_release(struct device *dev)
{
@@ -93,6 +95,10 @@ static int spi_match_device(struct device *dev, struct device_driver *drv)
if (of_driver_match_device(dev, drv))
return 1;
+ /* Then try ACPI */
+ if (acpi_driver_match_device(dev, drv))
+ return 1;
+
if (sdrv->id_table)
return !!spi_match_id(sdrv->id_table, spi);
@@ -888,6 +894,100 @@ static void of_register_spi_devices(struct spi_master *master)
static void of_register_spi_devices(struct spi_master *master) { }
#endif
+#ifdef CONFIG_ACPI
+static int acpi_spi_add_resource(struct acpi_resource *ares, void *data)
+{
+ struct spi_device *spi = data;
+
+ if (ares->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) {
+ struct acpi_resource_spi_serialbus *sb;
+
+ sb = &ares->data.spi_serial_bus;
+ if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_SPI) {
+ spi->chip_select = sb->device_selection;
+ spi->max_speed_hz = sb->connection_speed;
+
+ if (sb->clock_phase == ACPI_SPI_SECOND_PHASE)
+ spi->mode |= SPI_CPHA;
+ if (sb->clock_polarity == ACPI_SPI_START_HIGH)
+ spi->mode |= SPI_CPOL;
+ if (sb->device_polarity == ACPI_SPI_ACTIVE_HIGH)
+ spi->mode |= SPI_CS_HIGH;
+ }
+ } else if (spi->irq < 0) {
+ struct resource r;
+
+ if (acpi_dev_resource_interrupt(ares, 0, &r))
+ spi->irq = r.start;
+ }
+
+ /* Always tell the ACPI core to skip this resource */
+ return 1;
+}
+
+static acpi_status acpi_spi_add_device(acpi_handle handle, u32 level,
+ void *data, void **return_value)
+{
+ struct spi_master *master = data;
+ struct list_head resource_list;
+ struct acpi_device *adev;
+ struct spi_device *spi;
+ int ret;
+
+ if (acpi_bus_get_device(handle, &adev))
+ return AE_OK;
+ if (acpi_bus_get_status(adev) || !adev->status.present)
+ return AE_OK;
+
+ spi = spi_alloc_device(master);
+ if (!spi) {
+ dev_err(&master->dev, "failed to allocate SPI device for %s\n",
+ dev_name(&adev->dev));
+ return AE_NO_MEMORY;
+ }
+
+ ACPI_HANDLE_SET(&spi->dev, handle);
+ spi->irq = -1;
+
+ INIT_LIST_HEAD(&resource_list);
+ ret = acpi_dev_get_resources(adev, &resource_list,
+ acpi_spi_add_resource, spi);
+ acpi_dev_free_resource_list(&resource_list);
+
+ if (ret < 0 || !spi->max_speed_hz) {
+ spi_dev_put(spi);
+ return AE_OK;
+ }
+
+ strlcpy(spi->modalias, dev_name(&adev->dev), sizeof(spi->modalias));
+ if (spi_add_device(spi)) {
+ dev_err(&master->dev, "failed to add SPI device %s from ACPI\n",
+ dev_name(&adev->dev));
+ spi_dev_put(spi);
+ }
+
+ return AE_OK;
+}
+
+static void acpi_register_spi_devices(struct spi_master *master)
+{
+ acpi_status status;
+ acpi_handle handle;
+
+ handle = ACPI_HANDLE(&master->dev);
+ if (!handle)
+ return;
+
+ status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
+ acpi_spi_add_device, NULL,
+ master, NULL);
+ if (ACPI_FAILURE(status))
+ dev_warn(&master->dev, "failed to enumerate SPI slaves\n");
+}
+#else
+static inline void acpi_register_spi_devices(struct spi_master *master) {}
+#endif /* CONFIG_ACPI */
+
static void spi_master_release(struct device *dev)
{
struct spi_master *master;
@@ -1023,8 +1123,9 @@ int spi_register_master(struct spi_master *master)
spi_match_master_to_boardinfo(master, &bi->board_info);
mutex_unlock(&board_lock);
- /* Register devices from the device tree */
+ /* Register devices from the device tree and ACPI */
of_register_spi_devices(master);
+ acpi_register_spi_devices(master);
done:
return status;
}
diff --git a/include/linux/acpi_gpio.h b/include/linux/acpi_gpio.h
new file mode 100644
index 000000000000..91615a389b65
--- /dev/null
+++ b/include/linux/acpi_gpio.h
@@ -0,0 +1,19 @@
+#ifndef _LINUX_ACPI_GPIO_H_
+#define _LINUX_ACPI_GPIO_H_
+
+#include <linux/errno.h>
+
+#ifdef CONFIG_GPIO_ACPI
+
+int acpi_get_gpio(char *path, int pin);
+
+#else /* CONFIG_GPIO_ACPI */
+
+static inline int acpi_get_gpio(char *path, int pin)
+{
+ return -ENODEV;
+}
+
+#endif /* CONFIG_GPIO_ACPI */
+
+#endif /* _LINUX_ACPI_GPIO_H_ */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-28 21:57:32 +0000