Merge tag 'pm+acpi-for-3.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull ACPI and power management updates from Rafael Wysocki:

 - Introduction of device PM QoS flags.

 - ACPI device power management update allowing subsystems other than
   PCI to use it more easily.

 - ACPI device enumeration rework allowing additional kinds of devices
   to be enumerated via ACPI.  From Mika Westerberg, Adrian Hunter,
   Mathias Nyman, Andy Shevchenko, and Rafael J. Wysocki.

 - ACPICA update to version 20121018 from Bob Moore and Lv Zheng.

 - ACPI memory hotplug update from Wen Congyang and Yasuaki Ishimatsu.

 - Introduction of acpi_handle_<level>() messaging macros and ACPI-based
   CPU hot-remove support from Toshi Kani.

 - ACPI EC updates from Feng Tang.

 - cpufreq updates from Viresh Kumar, Fabio Baltieri and others.

 - cpuidle changes to quickly notice governor prediction failure from
   Youquan Song.

 - Support for using multiple cpuidle drivers at the same time and
   cpuidle cleanups from Daniel Lezcano.

 - devfreq updates from Nishanth Menon and others.

 - cpupower update from Thomas Renninger.

 - Fixes and small cleanups all over the place.

* tag 'pm+acpi-for-3.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (196 commits)
  mmc: sdhci-acpi: enable runtime-pm for device HID INT33C6
  ACPI: add Haswell LPSS devices to acpi_platform_device_ids list
  ACPI: add documentation about ACPI 5 enumeration
  pnpacpi: fix incorrect TEST_ALPHA() test
  ACPI / PM: Fix header of acpi_dev_pm_detach() in acpi.h
  ACPI / video: ignore BIOS initial backlight value for HP Folio 13-2000
  ACPI : do not use Lid and Sleep button for S5 wakeup
  ACPI / PNP: Do not crash due to stale pointer use during system resume
  ACPI / video: Add "Asus UL30VT" to ACPI video detect blacklist
  ACPI: do acpisleep dmi check when CONFIG_ACPI_SLEEP is set
  spi / ACPI: add ACPI enumeration support
  gpio / ACPI: add ACPI support
  PM / devfreq: remove compiler error with module governors (2)
  cpupower: IvyBridge (0x3a and 0x3e models) support
  cpupower: Provide -c param for cpupower monitor to schedule process on all cores
  cpupower tools: Fix warning and a bug with the cpu package count
  cpupower tools: Fix malloc of cpu_info structure
  cpupower tools: Fix issues with sysfs_topology_read_file
  cpupower tools: Fix minor warnings
  cpupower tools: Update .gitignore for files created in the debug directories
  ...

1 files changed, 102 insertions, 1 deletions

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index d3e64080c409..718cc1f49230 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;
 }