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acpi_dev_get_resources() does perform the NULL pointer check against ACPI companion device which is given as function parameter. Thus, there is no need to duplicate this check in the caller. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
146 lines
3.2 KiB
C
146 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Common code for Intel Cherry Trail ACPI INT33FE pseudo device drivers
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* (USB Micro-B and Type-C connector variants).
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*
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* Copyright (c) 2019 Yauhen Kharuzhy <jekhor@gmail.com>
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*/
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#include <linux/acpi.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include "intel_cht_int33fe_common.h"
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#define EXPECTED_PTYPE 4
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static int cht_int33fe_i2c_res_filter(struct acpi_resource *ares, void *data)
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{
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struct acpi_resource_i2c_serialbus *sb;
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int *count = data;
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if (i2c_acpi_get_i2c_resource(ares, &sb))
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(*count)++;
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return 1;
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}
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static int cht_int33fe_count_i2c_clients(struct device *dev)
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{
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struct acpi_device *adev = ACPI_COMPANION(dev);
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LIST_HEAD(resource_list);
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int count = 0;
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int ret;
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ret = acpi_dev_get_resources(adev, &resource_list,
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cht_int33fe_i2c_res_filter, &count);
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acpi_dev_free_resource_list(&resource_list);
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if (ret < 0)
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return ret;
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return count;
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}
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static int cht_int33fe_check_hw_type(struct device *dev)
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{
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unsigned long long ptyp;
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acpi_status status;
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int ret;
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status = acpi_evaluate_integer(ACPI_HANDLE(dev), "PTYP", NULL, &ptyp);
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if (ACPI_FAILURE(status)) {
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dev_err(dev, "Error getting PTYPE\n");
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return -ENODEV;
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}
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/*
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* The same ACPI HID is used for different configurations check PTYP
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* to ensure that we are dealing with the expected config.
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*/
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if (ptyp != EXPECTED_PTYPE)
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return -ENODEV;
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/* Check presence of INT34D3 (hardware-rev 3) expected for ptype == 4 */
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if (!acpi_dev_present("INT34D3", "1", 3)) {
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dev_err(dev, "Error PTYPE == %d, but no INT34D3 device\n",
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EXPECTED_PTYPE);
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return -ENODEV;
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}
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ret = cht_int33fe_count_i2c_clients(dev);
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if (ret < 0)
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return ret;
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switch (ret) {
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case 2:
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return INT33FE_HW_MICROB;
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case 4:
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return INT33FE_HW_TYPEC;
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default:
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return -ENODEV;
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}
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}
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static int cht_int33fe_probe(struct platform_device *pdev)
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{
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struct cht_int33fe_data *data;
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struct device *dev = &pdev->dev;
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int ret;
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ret = cht_int33fe_check_hw_type(dev);
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if (ret < 0)
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return ret;
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data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->dev = dev;
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switch (ret) {
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case INT33FE_HW_MICROB:
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data->probe = cht_int33fe_microb_probe;
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data->remove = cht_int33fe_microb_remove;
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break;
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case INT33FE_HW_TYPEC:
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data->probe = cht_int33fe_typec_probe;
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data->remove = cht_int33fe_typec_remove;
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break;
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}
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platform_set_drvdata(pdev, data);
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return data->probe(data);
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}
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static int cht_int33fe_remove(struct platform_device *pdev)
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{
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struct cht_int33fe_data *data = platform_get_drvdata(pdev);
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return data->remove(data);
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}
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static const struct acpi_device_id cht_int33fe_acpi_ids[] = {
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{ "INT33FE", },
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{ }
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};
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MODULE_DEVICE_TABLE(acpi, cht_int33fe_acpi_ids);
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static struct platform_driver cht_int33fe_driver = {
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.driver = {
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.name = "Intel Cherry Trail ACPI INT33FE driver",
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.acpi_match_table = ACPI_PTR(cht_int33fe_acpi_ids),
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},
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.probe = cht_int33fe_probe,
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.remove = cht_int33fe_remove,
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};
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module_platform_driver(cht_int33fe_driver);
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MODULE_DESCRIPTION("Intel Cherry Trail ACPI INT33FE pseudo device driver");
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MODULE_AUTHOR("Yauhen Kharuzhy <jekhor@gmail.com>");
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MODULE_LICENSE("GPL v2");
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