[PATCH] spi: spidev: Add ACPI probing support

[Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>]

Some IoT and maker software stacks are using spidev to perform raw access
to the SPI bus instead of relying existing drivers provided by the kernel.
They then implement their own "drivers" in userspace on top of the spidev
raw interface. This is far from being an ideal solution but we do not want
to prevent using mainline Linux in these devices.

Now, it turns out that Windows has similar SPI devices than spidev which
allow raw access on the SPI bus to userspace programs as described in the
link below:

  https://msdn.microsoft.com/windows/hardware/drivers/spb/spi-tests-in-mitt

These SPI test devices are also meant to be used during development and
testing.

In order to allow usage of spidev for development and testing in Linux, add
those same ACPI IDs to the spidev driver (which is Linux counterpart of the
Windows SPI test devices), but complain loudly so that users know it is not
good idea to use it in production systems. Instead they should be using
proper drivers for peripherals connected to the SPI bus.

Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
---
 drivers/spi/spidev.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c
index e3c19f30f591..8dcad01b786d 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 +701,16 @@ static const struct of_device_id spidev_dt_ids[] = {
 MODULE_DEVICE_TABLE(of, spidev_dt_ids);
 #endif
 
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id spidev_acpi_ids[] = {
+	{ "SPT0001" },
+	{ "SPT0002" },
+	{ "SPT0003" },
+	{},
+};
+MODULE_DEVICE_TABLE(acpi, spidev_acpi_ids);
+#endif
+
 /*-------------------------------------------------------------------------*/
 
 static int spidev_probe(struct spi_device *spi)
@@ -719,6 +730,15 @@ static int spidev_probe(struct spi_device *spi)
 			!of_match_device(spidev_dt_ids, &spi->dev));
 	}
 
+	/*
+	 * 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.
+	 */
+	if (has_acpi_companion(&spi->dev))
+		dev_warn(&spi->dev, "do not use this driver in production systems!\n");
+
 	/* Allocate driver data */
 	spidev = kzalloc(sizeof(*spidev), GFP_KERNEL);
 	if (!spidev)
@@ -789,6 +809,7 @@ 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,
-- 
2.8.1

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