| // SPDX-License-Identifier: GPL-2.0 |
| /* Author: Dan Scally <djrscally@gmail.com> */ |
| |
| #include <linux/acpi.h> |
| #include <linux/i2c.h> |
| #include <linux/platform_device.h> |
| #include <linux/slab.h> |
| |
| #include "intel_skl_int3472_common.h" |
| |
| union acpi_object *skl_int3472_get_acpi_buffer(struct acpi_device *adev, char *id) |
| { |
| struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| acpi_handle handle = adev->handle; |
| union acpi_object *obj; |
| acpi_status status; |
| |
| status = acpi_evaluate_object(handle, id, NULL, &buffer); |
| if (ACPI_FAILURE(status)) |
| return ERR_PTR(-ENODEV); |
| |
| obj = buffer.pointer; |
| if (!obj) |
| return ERR_PTR(-ENODEV); |
| |
| if (obj->type != ACPI_TYPE_BUFFER) { |
| acpi_handle_err(handle, "%s object is not an ACPI buffer\n", id); |
| kfree(obj); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| return obj; |
| } |
| |
| int skl_int3472_fill_cldb(struct acpi_device *adev, struct int3472_cldb *cldb) |
| { |
| union acpi_object *obj; |
| int ret; |
| |
| obj = skl_int3472_get_acpi_buffer(adev, "CLDB"); |
| if (IS_ERR(obj)) |
| return PTR_ERR(obj); |
| |
| if (obj->buffer.length > sizeof(*cldb)) { |
| acpi_handle_err(adev->handle, "The CLDB buffer is too large\n"); |
| ret = -EINVAL; |
| goto out_free_obj; |
| } |
| |
| memcpy(cldb, obj->buffer.pointer, obj->buffer.length); |
| ret = 0; |
| |
| out_free_obj: |
| kfree(obj); |
| return ret; |
| } |
| |
| static const struct acpi_device_id int3472_device_id[] = { |
| { "INT3472", 0 }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(acpi, int3472_device_id); |
| |
| static struct platform_driver int3472_discrete = { |
| .driver = { |
| .name = "int3472-discrete", |
| .acpi_match_table = int3472_device_id, |
| }, |
| .probe = skl_int3472_discrete_probe, |
| .remove = skl_int3472_discrete_remove, |
| }; |
| |
| static struct i2c_driver int3472_tps68470 = { |
| .driver = { |
| .name = "int3472-tps68470", |
| .acpi_match_table = int3472_device_id, |
| }, |
| .probe_new = skl_int3472_tps68470_probe, |
| }; |
| |
| static int skl_int3472_init(void) |
| { |
| int ret; |
| |
| ret = platform_driver_register(&int3472_discrete); |
| if (ret) |
| return ret; |
| |
| ret = i2c_register_driver(THIS_MODULE, &int3472_tps68470); |
| if (ret) |
| platform_driver_unregister(&int3472_discrete); |
| |
| return ret; |
| } |
| module_init(skl_int3472_init); |
| |
| static void skl_int3472_exit(void) |
| { |
| platform_driver_unregister(&int3472_discrete); |
| i2c_del_driver(&int3472_tps68470); |
| } |
| module_exit(skl_int3472_exit); |
| |
| MODULE_DESCRIPTION("Intel SkyLake INT3472 ACPI Device Driver"); |
| MODULE_AUTHOR("Daniel Scally <djrscally@gmail.com>"); |
| MODULE_LICENSE("GPL v2"); |