diff options
Diffstat (limited to 'drivers/i2c')
-rw-r--r-- | drivers/i2c/busses/i2c-nvidia-gpu.c | 2 | ||||
-rw-r--r-- | drivers/i2c/i2c-core-acpi.c | 64 |
2 files changed, 46 insertions, 20 deletions
diff --git a/drivers/i2c/busses/i2c-nvidia-gpu.c b/drivers/i2c/busses/i2c-nvidia-gpu.c index e99c3bb58351..4e67d5ed480e 100644 --- a/drivers/i2c/busses/i2c-nvidia-gpu.c +++ b/drivers/i2c/busses/i2c-nvidia-gpu.c @@ -342,7 +342,7 @@ static void gpu_i2c_remove(struct pci_dev *pdev) pci_free_irq_vectors(pdev); } -static int gpu_i2c_resume(struct device *dev) +static __maybe_unused int gpu_i2c_resume(struct device *dev) { struct gpu_i2c_dev *i2cd = dev_get_drvdata(dev); diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c index 32affd3fa8bd..272800692088 100644 --- a/drivers/i2c/i2c-core-acpi.c +++ b/drivers/i2c/i2c-core-acpi.c @@ -45,6 +45,33 @@ struct i2c_acpi_lookup { u32 min_speed; }; +/** + * i2c_acpi_get_i2c_resource - Gets I2cSerialBus resource if type matches + * @ares: ACPI resource + * @i2c: Pointer to I2cSerialBus resource will be returned here + * + * Checks if the given ACPI resource is of type I2cSerialBus. + * In this case, returns a pointer to it to the caller. + * + * Returns true if resource type is of I2cSerialBus, otherwise false. + */ +bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares, + struct acpi_resource_i2c_serialbus **i2c) +{ + struct acpi_resource_i2c_serialbus *sb; + + if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) + return false; + + sb = &ares->data.i2c_serial_bus; + if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C) + return false; + + *i2c = sb; + return true; +} +EXPORT_SYMBOL_GPL(i2c_acpi_get_i2c_resource); + static int i2c_acpi_fill_info(struct acpi_resource *ares, void *data) { struct i2c_acpi_lookup *lookup = data; @@ -52,11 +79,7 @@ static int i2c_acpi_fill_info(struct acpi_resource *ares, void *data) struct acpi_resource_i2c_serialbus *sb; acpi_status status; - if (info->addr || ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) - return 1; - - sb = &ares->data.i2c_serial_bus; - if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C) + if (info->addr || !i2c_acpi_get_i2c_resource(ares, &sb)) return 1; if (lookup->index != -1 && lookup->n++ != lookup->index) @@ -65,7 +88,7 @@ static int i2c_acpi_fill_info(struct acpi_resource *ares, void *data) status = acpi_get_handle(lookup->device_handle, sb->resource_source.string_ptr, &lookup->adapter_handle); - if (!ACPI_SUCCESS(status)) + if (ACPI_FAILURE(status)) return 1; info->addr = sb->slave_address; @@ -386,20 +409,22 @@ struct notifier_block i2c_acpi_notifier = { * * Also see i2c_new_device, which this function calls to create the i2c-client. * - * Returns a pointer to the new i2c-client, or NULL if the adapter is not found. + * Returns a pointer to the new i2c-client, or error pointer in case of failure. + * Specifically, -EPROBE_DEFER is returned if the adapter is not found. */ struct i2c_client *i2c_acpi_new_device(struct device *dev, int index, struct i2c_board_info *info) { struct i2c_acpi_lookup lookup; struct i2c_adapter *adapter; + struct i2c_client *client; struct acpi_device *adev; LIST_HEAD(resource_list); int ret; adev = ACPI_COMPANION(dev); if (!adev) - return NULL; + return ERR_PTR(-EINVAL); memset(&lookup, 0, sizeof(lookup)); lookup.info = info; @@ -408,16 +433,23 @@ struct i2c_client *i2c_acpi_new_device(struct device *dev, int index, ret = acpi_dev_get_resources(adev, &resource_list, i2c_acpi_fill_info, &lookup); + if (ret < 0) + return ERR_PTR(ret); + acpi_dev_free_resource_list(&resource_list); - if (ret < 0 || !info->addr) - return NULL; + if (!info->addr) + return ERR_PTR(-EADDRNOTAVAIL); adapter = i2c_acpi_find_adapter_by_handle(lookup.adapter_handle); if (!adapter) - return NULL; + return ERR_PTR(-EPROBE_DEFER); + + client = i2c_new_device(adapter, info); + if (!client) + return ERR_PTR(-ENODEV); - return i2c_new_device(adapter, info); + return client; } EXPORT_SYMBOL_GPL(i2c_acpi_new_device); @@ -525,13 +557,7 @@ i2c_acpi_space_handler(u32 function, acpi_physical_address command, goto err; } - if (!value64 || ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) { - ret = AE_BAD_PARAMETER; - goto err; - } - - sb = &ares->data.i2c_serial_bus; - if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C) { + if (!value64 || !i2c_acpi_get_i2c_resource(ares, &sb)) { ret = AE_BAD_PARAMETER; goto err; } |