1 // SPDX-License-Identifier: GPL-2.0 2 /* Author: Dan Scally <djrscally@gmail.com> */ 3 4 #include <linux/acpi.h> 5 #include <linux/platform_data/x86/int3472.h> 6 #include <linux/slab.h> 7 8 union acpi_object *skl_int3472_get_acpi_buffer(struct acpi_device *adev, char *id) 9 { 10 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 11 acpi_handle handle = adev->handle; 12 union acpi_object *obj; 13 acpi_status status; 14 15 status = acpi_evaluate_object(handle, id, NULL, &buffer); 16 if (ACPI_FAILURE(status)) 17 return ERR_PTR(-ENODEV); 18 19 obj = buffer.pointer; 20 if (!obj) 21 return ERR_PTR(-ENODEV); 22 23 if (obj->type != ACPI_TYPE_BUFFER) { 24 acpi_handle_err(handle, "%s object is not an ACPI buffer\n", id); 25 kfree(obj); 26 return ERR_PTR(-EINVAL); 27 } 28 29 return obj; 30 } 31 EXPORT_SYMBOL_NS_GPL(skl_int3472_get_acpi_buffer, "INTEL_INT3472"); 32 33 int skl_int3472_fill_cldb(struct acpi_device *adev, struct int3472_cldb *cldb) 34 { 35 union acpi_object *obj; 36 int ret; 37 38 obj = skl_int3472_get_acpi_buffer(adev, "CLDB"); 39 if (IS_ERR(obj)) 40 return PTR_ERR(obj); 41 42 if (obj->buffer.length > sizeof(*cldb)) { 43 acpi_handle_err(adev->handle, "The CLDB buffer is too large\n"); 44 ret = -EINVAL; 45 goto out_free_obj; 46 } 47 48 memcpy(cldb, obj->buffer.pointer, obj->buffer.length); 49 ret = 0; 50 51 out_free_obj: 52 kfree(obj); 53 return ret; 54 } 55 EXPORT_SYMBOL_NS_GPL(skl_int3472_fill_cldb, "INTEL_INT3472"); 56 57 /* sensor_adev_ret may be NULL, name_ret must not be NULL */ 58 int skl_int3472_get_sensor_adev_and_name(struct device *dev, 59 struct acpi_device **sensor_adev_ret, 60 const char **name_ret) 61 { 62 struct acpi_device *adev = ACPI_COMPANION(dev); 63 struct acpi_device *sensor; 64 int ret = 0; 65 66 sensor = acpi_dev_get_next_consumer_dev(adev, NULL); 67 if (!sensor) { 68 dev_err(dev, "INT3472 seems to have no dependents.\n"); 69 return -ENODEV; 70 } 71 72 dev_dbg(dev, "Sensor name %s\n", acpi_dev_name(sensor)); 73 74 *name_ret = devm_kasprintf(dev, GFP_KERNEL, I2C_DEV_NAME_FORMAT, 75 acpi_dev_name(sensor)); 76 if (!*name_ret) 77 ret = -ENOMEM; 78 79 if (ret == 0 && sensor_adev_ret) 80 *sensor_adev_ret = sensor; 81 else 82 acpi_dev_put(sensor); 83 84 return ret; 85 } 86 EXPORT_SYMBOL_NS_GPL(skl_int3472_get_sensor_adev_and_name, "INTEL_INT3472"); 87 88 MODULE_DESCRIPTION("Intel SkyLake INT3472 ACPI Device Driver library"); 89 MODULE_AUTHOR("Daniel Scally <djrscally@gmail.com>"); 90 MODULE_LICENSE("GPL"); 91