1 // SPDX-License-Identifier: GPL-2.0 2 /* Author: Dan Scally <djrscally@gmail.com> */ 3 4 #include <linux/acpi.h> 5 #include <linux/slab.h> 6 7 #include "common.h" 8 9 union acpi_object *skl_int3472_get_acpi_buffer(struct acpi_device *adev, char *id) 10 { 11 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 12 acpi_handle handle = adev->handle; 13 union acpi_object *obj; 14 acpi_status status; 15 16 status = acpi_evaluate_object(handle, id, NULL, &buffer); 17 if (ACPI_FAILURE(status)) 18 return ERR_PTR(-ENODEV); 19 20 obj = buffer.pointer; 21 if (!obj) 22 return ERR_PTR(-ENODEV); 23 24 if (obj->type != ACPI_TYPE_BUFFER) { 25 acpi_handle_err(handle, "%s object is not an ACPI buffer\n", id); 26 kfree(obj); 27 return ERR_PTR(-EINVAL); 28 } 29 30 return obj; 31 } 32 EXPORT_SYMBOL_GPL(skl_int3472_get_acpi_buffer); 33 34 int skl_int3472_fill_cldb(struct acpi_device *adev, struct int3472_cldb *cldb) 35 { 36 union acpi_object *obj; 37 int ret; 38 39 obj = skl_int3472_get_acpi_buffer(adev, "CLDB"); 40 if (IS_ERR(obj)) 41 return PTR_ERR(obj); 42 43 if (obj->buffer.length > sizeof(*cldb)) { 44 acpi_handle_err(adev->handle, "The CLDB buffer is too large\n"); 45 ret = -EINVAL; 46 goto out_free_obj; 47 } 48 49 memcpy(cldb, obj->buffer.pointer, obj->buffer.length); 50 ret = 0; 51 52 out_free_obj: 53 kfree(obj); 54 return ret; 55 } 56 EXPORT_SYMBOL_GPL(skl_int3472_fill_cldb); 57 58 /* sensor_adev_ret may be NULL, name_ret must not be NULL */ 59 int skl_int3472_get_sensor_adev_and_name(struct device *dev, 60 struct acpi_device **sensor_adev_ret, 61 const char **name_ret) 62 { 63 struct acpi_device *adev = ACPI_COMPANION(dev); 64 struct acpi_device *sensor; 65 int ret = 0; 66 67 sensor = acpi_dev_get_next_consumer_dev(adev, NULL); 68 if (!sensor) { 69 dev_err(dev, "INT3472 seems to have no dependents.\n"); 70 return -ENODEV; 71 } 72 73 *name_ret = devm_kasprintf(dev, GFP_KERNEL, I2C_DEV_NAME_FORMAT, 74 acpi_dev_name(sensor)); 75 if (!*name_ret) 76 ret = -ENOMEM; 77 78 if (ret == 0 && sensor_adev_ret) 79 *sensor_adev_ret = sensor; 80 else 81 acpi_dev_put(sensor); 82 83 return ret; 84 } 85 EXPORT_SYMBOL_GPL(skl_int3472_get_sensor_adev_and_name); 86 87 MODULE_DESCRIPTION("Intel SkyLake INT3472 ACPI Device Driver library"); 88 MODULE_AUTHOR("Daniel Scally <djrscally@gmail.com>"); 89 MODULE_LICENSE("GPL"); 90