diff options
| -rw-r--r-- | drivers/gpio/Kconfig | 4 | ||||
| -rw-r--r-- | drivers/gpio/Makefile | 1 | ||||
| -rw-r--r-- | drivers/gpio/gpiolib-acpi.c | 54 | ||||
| -rw-r--r-- | drivers/spi/spi.c | 103 | ||||
| -rw-r--r-- | include/linux/acpi_gpio.h | 19 |
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_ */ |