diff options
Diffstat (limited to 'drivers/spi/spidev.c')
| -rw-r--r-- | drivers/spi/spidev.c | 41 |
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, |