324 lines
8.9 KiB
C
324 lines
8.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2021, Intel Corporation.
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*/
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#include <linux/acpi.h>
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#include <linux/kobject.h>
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#include <linux/platform_device.h>
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#include <linux/sysfs.h>
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#include "intel_sar.h"
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/**
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* get_int_value: Retrieve integer values from ACPI Object
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* @obj: acpi_object pointer which has the integer value
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* @out: output pointer will get integer value
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*
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* Function is used to retrieve integer value from acpi object.
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*
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* Return:
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* * 0 on success
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* * -EIO if there is an issue in acpi_object passed.
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*/
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static int get_int_value(union acpi_object *obj, int *out)
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{
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if (!obj || obj->type != ACPI_TYPE_INTEGER)
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return -EIO;
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*out = (int)obj->integer.value;
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return 0;
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}
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/**
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* update_sar_data: sar data is updated based on regulatory mode
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* @context: pointer to driver context structure
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*
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* sar_data is updated based on regulatory value
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* context->reg_value will never exceed MAX_REGULATORY
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*/
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static void update_sar_data(struct wwan_sar_context *context)
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{
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struct wwan_device_mode_configuration *config =
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&context->config_data[context->reg_value];
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if (config->device_mode_info &&
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context->sar_data.device_mode < config->total_dev_mode) {
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int itr = 0;
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for (itr = 0; itr < config->total_dev_mode; itr++) {
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if (context->sar_data.device_mode ==
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config->device_mode_info[itr].device_mode) {
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struct wwan_device_mode_info *dev_mode =
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&config->device_mode_info[itr];
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context->sar_data.antennatable_index = dev_mode->antennatable_index;
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context->sar_data.bandtable_index = dev_mode->bandtable_index;
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context->sar_data.sartable_index = dev_mode->sartable_index;
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break;
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}
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}
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}
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}
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/**
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* parse_package: parse acpi package for retrieving SAR information
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* @context: pointer to driver context structure
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* @item : acpi_object pointer
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*
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* Given acpi_object is iterated to retrieve information for each device mode.
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* If a given package corresponding to a specific device mode is faulty, it is
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* skipped and the specific entry in context structure will have the default value
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* of zero. Decoding of subsequent device modes is realized by having "continue"
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* statements in the for loop on encountering error in parsing given device mode.
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*
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* Return:
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* AE_OK if success
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* AE_ERROR on error
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*/
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static acpi_status parse_package(struct wwan_sar_context *context, union acpi_object *item)
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{
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struct wwan_device_mode_configuration *data;
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int value, itr, reg;
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union acpi_object *num;
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num = &item->package.elements[0];
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if (get_int_value(num, &value) || value < 0 || value >= MAX_REGULATORY)
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return AE_ERROR;
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reg = value;
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data = &context->config_data[reg];
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if (data->total_dev_mode > MAX_DEV_MODES || data->total_dev_mode == 0 ||
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item->package.count <= data->total_dev_mode)
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return AE_ERROR;
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data->device_mode_info = kmalloc_array(data->total_dev_mode,
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sizeof(struct wwan_device_mode_info), GFP_KERNEL);
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if (!data->device_mode_info)
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return AE_ERROR;
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for (itr = 0; itr < data->total_dev_mode; itr++) {
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struct wwan_device_mode_info temp = { 0 };
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num = &item->package.elements[itr + 1];
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if (num->type != ACPI_TYPE_PACKAGE || num->package.count < TOTAL_DATA)
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continue;
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if (get_int_value(&num->package.elements[0], &temp.device_mode))
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continue;
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if (get_int_value(&num->package.elements[1], &temp.bandtable_index))
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continue;
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if (get_int_value(&num->package.elements[2], &temp.antennatable_index))
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continue;
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if (get_int_value(&num->package.elements[3], &temp.sartable_index))
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continue;
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data->device_mode_info[itr] = temp;
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}
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return AE_OK;
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}
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/**
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* sar_get_device_mode: Extraction of information from BIOS via DSM calls
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* @device: ACPI device for which to retrieve the data
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*
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* Retrieve the current device mode information from the BIOS.
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*
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* Return:
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* AE_OK on success
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* AE_ERROR on error
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*/
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static acpi_status sar_get_device_mode(struct platform_device *device)
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{
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struct wwan_sar_context *context = dev_get_drvdata(&device->dev);
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acpi_status status = AE_OK;
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union acpi_object *out;
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u32 rev = 0;
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int value;
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out = acpi_evaluate_dsm(context->handle, &context->guid, rev,
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COMMAND_ID_DEV_MODE, NULL);
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if (get_int_value(out, &value)) {
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dev_err(&device->dev, "DSM cmd:%d Failed to retrieve value\n", COMMAND_ID_DEV_MODE);
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status = AE_ERROR;
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goto dev_mode_error;
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}
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context->sar_data.device_mode = value;
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update_sar_data(context);
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sysfs_notify(&device->dev.kobj, NULL, SYSFS_DATANAME);
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dev_mode_error:
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ACPI_FREE(out);
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return status;
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}
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static const struct acpi_device_id sar_device_ids[] = {
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{ "INTC1092", 0},
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{}
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};
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MODULE_DEVICE_TABLE(acpi, sar_device_ids);
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static ssize_t intc_data_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct wwan_sar_context *context = dev_get_drvdata(dev);
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return sysfs_emit(buf, "%d %d %d %d\n", context->sar_data.device_mode,
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context->sar_data.bandtable_index,
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context->sar_data.antennatable_index,
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context->sar_data.sartable_index);
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}
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static DEVICE_ATTR_RO(intc_data);
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static ssize_t intc_reg_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct wwan_sar_context *context = dev_get_drvdata(dev);
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return sysfs_emit(buf, "%d\n", context->reg_value);
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}
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static ssize_t intc_reg_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct wwan_sar_context *context = dev_get_drvdata(dev);
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unsigned int value;
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int read;
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if (!count)
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return -EINVAL;
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read = kstrtouint(buf, 10, &value);
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if (read < 0)
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return read;
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if (value >= MAX_REGULATORY)
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return -EOVERFLOW;
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context->reg_value = value;
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update_sar_data(context);
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sysfs_notify(&dev->kobj, NULL, SYSFS_DATANAME);
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return count;
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}
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static DEVICE_ATTR_RW(intc_reg);
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static struct attribute *intcsar_attrs[] = {
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&dev_attr_intc_data.attr,
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&dev_attr_intc_reg.attr,
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NULL
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};
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static struct attribute_group intcsar_group = {
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.attrs = intcsar_attrs,
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};
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static void sar_notify(acpi_handle handle, u32 event, void *data)
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{
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struct platform_device *device = data;
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if (event == SAR_EVENT) {
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if (sar_get_device_mode(device) != AE_OK)
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dev_err(&device->dev, "sar_get_device_mode error");
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}
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}
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static void sar_get_data(int reg, struct wwan_sar_context *context)
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{
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union acpi_object *out, req;
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u32 rev = 0;
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req.type = ACPI_TYPE_INTEGER;
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req.integer.value = reg;
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out = acpi_evaluate_dsm(context->handle, &context->guid, rev,
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COMMAND_ID_CONFIG_TABLE, &req);
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if (!out)
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return;
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if (out->type == ACPI_TYPE_PACKAGE && out->package.count >= 3 &&
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out->package.elements[0].type == ACPI_TYPE_INTEGER &&
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out->package.elements[1].type == ACPI_TYPE_INTEGER &&
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out->package.elements[2].type == ACPI_TYPE_PACKAGE &&
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out->package.elements[2].package.count > 0) {
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context->config_data[reg].version = out->package.elements[0].integer.value;
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context->config_data[reg].total_dev_mode =
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out->package.elements[1].integer.value;
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if (context->config_data[reg].total_dev_mode <= 0 ||
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context->config_data[reg].total_dev_mode > MAX_DEV_MODES) {
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ACPI_FREE(out);
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return;
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}
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parse_package(context, &out->package.elements[2]);
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}
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ACPI_FREE(out);
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}
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static int sar_probe(struct platform_device *device)
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{
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struct wwan_sar_context *context;
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int reg;
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int result;
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context = kzalloc(sizeof(*context), GFP_KERNEL);
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if (!context)
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return -ENOMEM;
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context->sar_device = device;
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context->handle = ACPI_HANDLE(&device->dev);
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dev_set_drvdata(&device->dev, context);
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result = guid_parse(SAR_DSM_UUID, &context->guid);
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if (result) {
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dev_err(&device->dev, "SAR UUID parse error: %d\n", result);
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goto r_free;
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}
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for (reg = 0; reg < MAX_REGULATORY; reg++)
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sar_get_data(reg, context);
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if (sar_get_device_mode(device) != AE_OK) {
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dev_err(&device->dev, "Failed to get device mode\n");
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result = -EIO;
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goto r_free;
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}
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result = sysfs_create_group(&device->dev.kobj, &intcsar_group);
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if (result) {
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dev_err(&device->dev, "sysfs creation failed\n");
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goto r_free;
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}
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if (acpi_install_notify_handler(ACPI_HANDLE(&device->dev), ACPI_DEVICE_NOTIFY,
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sar_notify, (void *)device) != AE_OK) {
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dev_err(&device->dev, "Failed acpi_install_notify_handler\n");
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result = -EIO;
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goto r_sys;
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}
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return 0;
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r_sys:
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sysfs_remove_group(&device->dev.kobj, &intcsar_group);
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r_free:
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kfree(context);
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return result;
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}
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static int sar_remove(struct platform_device *device)
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{
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struct wwan_sar_context *context = dev_get_drvdata(&device->dev);
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int reg;
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acpi_remove_notify_handler(ACPI_HANDLE(&device->dev),
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ACPI_DEVICE_NOTIFY, sar_notify);
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sysfs_remove_group(&device->dev.kobj, &intcsar_group);
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for (reg = 0; reg < MAX_REGULATORY; reg++)
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kfree(context->config_data[reg].device_mode_info);
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kfree(context);
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return 0;
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}
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static struct platform_driver sar_driver = {
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.probe = sar_probe,
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.remove = sar_remove,
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.driver = {
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.name = DRVNAME,
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.acpi_match_table = ACPI_PTR(sar_device_ids)
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}
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};
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module_platform_driver(sar_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("Platform device driver for INTEL MODEM BIOS SAR");
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MODULE_AUTHOR("Shravan Sudhakar <s.shravan@intel.com>");
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