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path: root/drivers/spi/spidev.c
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Diffstat (limited to 'drivers/spi/spidev.c')
-rw-r--r--drivers/spi/spidev.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c
index e3c19f30f..2e05046f8 100644
--- a/drivers/spi/spidev.c
+++ b/drivers/spi/spidev.c
@@ -29,6 +29,7 @@
#include <linux/compat.h>
#include <linux/of.h>
#include <linux/of_device.h>
+#include <linux/acpi.h>
#include <linux/spi/spi.h>
#include <linux/spi/spidev.h>
@@ -700,6 +701,43 @@ static const struct of_device_id spidev_dt_ids[] = {
MODULE_DEVICE_TABLE(of, spidev_dt_ids);
#endif
+#ifdef CONFIG_ACPI
+
+/* Dummy SPI devices not to be used in production systems */
+#define SPIDEV_ACPI_DUMMY 1
+
+static const struct acpi_device_id spidev_acpi_ids[] = {
+ /*
+ * The ACPI SPT000* devices are only meant for development and
+ * testing. Systems used in production should have a proper ACPI
+ * description of the connected peripheral and they should also use
+ * a proper driver instead of poking directly to the SPI bus.
+ */
+ { "SPT0001", SPIDEV_ACPI_DUMMY },
+ { "SPT0002", SPIDEV_ACPI_DUMMY },
+ { "SPT0003", SPIDEV_ACPI_DUMMY },
+ {},
+};
+MODULE_DEVICE_TABLE(acpi, spidev_acpi_ids);
+
+static void spidev_probe_acpi(struct spi_device *spi)
+{
+ const struct acpi_device_id *id;
+
+ if (!has_acpi_companion(&spi->dev))
+ return;
+
+ id = acpi_match_device(spidev_acpi_ids, &spi->dev);
+ if (WARN_ON(!id))
+ return;
+
+ if (id->driver_data == SPIDEV_ACPI_DUMMY)
+ dev_warn(&spi->dev, "do not use this driver in production systems!\n");
+}
+#else
+static inline void spidev_probe_acpi(struct spi_device *spi) {}
+#endif
+
/*-------------------------------------------------------------------------*/
static int spidev_probe(struct spi_device *spi)
@@ -719,6 +757,8 @@ static int spidev_probe(struct spi_device *spi)
!of_match_device(spidev_dt_ids, &spi->dev));
}
+ spidev_probe_acpi(spi);
+
/* Allocate driver data */
spidev = kzalloc(sizeof(*spidev), GFP_KERNEL);
if (!spidev)
@@ -789,6 +829,7 @@ static struct spi_driver spidev_spi_driver = {
.driver = {
.name = "spidev",
.of_match_table = of_match_ptr(spidev_dt_ids),
+ .acpi_match_table = ACPI_PTR(spidev_acpi_ids),
},
.probe = spidev_probe,
.remove = spidev_remove,