drivers/platform/x86/intel_cht_int33fe_common.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Common code for Intel Cherry Trail ACPI INT33FE pseudo device drivers
   4  * (USB Micro-B and Type-C connector variants).
   5  *
   6  * Copyright (c) 2019 Yauhen Kharuzhy <jekhor@gmail.com>
   7  */
   8
   9 #include <linux/acpi.h>
  10 #include <linux/i2c.h>
  11 #include <linux/module.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/slab.h>
  14
  15 #include "intel_cht_int33fe_common.h"
  16
  17 #define EXPECTED_PTYPE          4
  18
  19 static int cht_int33fe_i2c_res_filter(struct acpi_resource *ares, void *data)
  20 {
  21         struct acpi_resource_i2c_serialbus *sb;
  22         int *count = data;
  23
  24         if (i2c_acpi_get_i2c_resource(ares, &sb))
  25                 (*count)++;
  26
  27         return 1;
  28 }
  29
  30 static int cht_int33fe_count_i2c_clients(struct device *dev)
  31 {
  32         struct acpi_device *adev = ACPI_COMPANION(dev);
  33         LIST_HEAD(resource_list);
  34         int count = 0;
  35         int ret;
  36
  37         ret = acpi_dev_get_resources(adev, &resource_list,
  38                                      cht_int33fe_i2c_res_filter, &count);
  39         acpi_dev_free_resource_list(&resource_list);
  40         if (ret < 0)
  41                 return ret;
  42
  43         return count;
  44 }
  45
  46 static int cht_int33fe_check_hw_type(struct device *dev)
  47 {
  48         unsigned long long ptyp;
  49         acpi_status status;
  50         int ret;
  51
  52         status = acpi_evaluate_integer(ACPI_HANDLE(dev), "PTYP", NULL, &ptyp);
  53         if (ACPI_FAILURE(status)) {
  54                 dev_err(dev, "Error getting PTYPE\n");
  55                 return -ENODEV;
  56         }
  57
  58         /*
  59          * The same ACPI HID is used for different configurations check PTYP
  60          * to ensure that we are dealing with the expected config.
  61          */
  62         if (ptyp != EXPECTED_PTYPE)
  63                 return -ENODEV;
  64
  65         /* Check presence of INT34D3 (hardware-rev 3) expected for ptype == 4 */
  66         if (!acpi_dev_present("INT34D3", "1", 3)) {
  67                 dev_err(dev, "Error PTYPE == %d, but no INT34D3 device\n",
  68                         EXPECTED_PTYPE);
  69                 return -ENODEV;
  70         }
  71
  72         ret = cht_int33fe_count_i2c_clients(dev);
  73         if (ret < 0)
  74                 return ret;
  75
  76         switch (ret) {
  77         case 2:
  78                 return INT33FE_HW_MICROB;
  79         case 4:
  80                 return INT33FE_HW_TYPEC;
  81         default:
  82                 return -ENODEV;
  83         }
  84 }
  85
  86 static int cht_int33fe_probe(struct platform_device *pdev)
  87 {
  88         struct cht_int33fe_data *data;
  89         struct device *dev = &pdev->dev;
  90         int ret;
  91
  92         ret = cht_int33fe_check_hw_type(dev);
  93         if (ret < 0)
  94                 return ret;
  95
  96         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
  97         if (!data)
  98                 return -ENOMEM;
  99
 100         data->dev = dev;
 101
 102         switch (ret) {
 103         case INT33FE_HW_MICROB:
 104                 data->probe = cht_int33fe_microb_probe;
 105                 data->remove = cht_int33fe_microb_remove;
 106                 break;
 107
 108         case INT33FE_HW_TYPEC:
 109                 data->probe = cht_int33fe_typec_probe;
 110                 data->remove = cht_int33fe_typec_remove;
 111                 break;
 112         }
 113
 114         platform_set_drvdata(pdev, data);
 115
 116         return data->probe(data);
 117 }
 118
 119 static int cht_int33fe_remove(struct platform_device *pdev)
 120 {
 121         struct cht_int33fe_data *data = platform_get_drvdata(pdev);
 122
 123         return data->remove(data);
 124 }
 125
 126 static const struct acpi_device_id cht_int33fe_acpi_ids[] = {
 127         { "INT33FE", },
 128         { }
 129 };
 130 MODULE_DEVICE_TABLE(acpi, cht_int33fe_acpi_ids);
 131
 132 static struct platform_driver cht_int33fe_driver = {
 133         .driver = {
 134                 .name = "Intel Cherry Trail ACPI INT33FE driver",
 135                 .acpi_match_table = ACPI_PTR(cht_int33fe_acpi_ids),
 136         },
 137         .probe = cht_int33fe_probe,
 138         .remove = cht_int33fe_remove,
 139 };
 140
 141 module_platform_driver(cht_int33fe_driver);
 142
 143 MODULE_DESCRIPTION("Intel Cherry Trail ACPI INT33FE pseudo device driver");
 144 MODULE_AUTHOR("Yauhen Kharuzhy <jekhor@gmail.com>");
 145 MODULE_LICENSE("GPL v2");