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;
  33         LIST_HEAD(resource_list);
  34         int count = 0;
  35
  36         adev = ACPI_COMPANION(dev);
  37         if (!adev)
  38                 return -EINVAL;
  39
  40         acpi_dev_get_resources(adev, &resource_list,
  41                                cht_int33fe_i2c_res_filter, &count);
  42
  43         acpi_dev_free_resource_list(&resource_list);
  44
  45         return count;
  46 }
  47
  48 static int cht_int33fe_check_hw_type(struct device *dev)
  49 {
  50         unsigned long long ptyp;
  51         acpi_status status;
  52         int ret;
  53
  54         status = acpi_evaluate_integer(ACPI_HANDLE(dev), "PTYP", NULL, &ptyp);
  55         if (ACPI_FAILURE(status)) {
  56                 dev_err(dev, "Error getting PTYPE\n");
  57                 return -ENODEV;
  58         }
  59
  60         /*
  61          * The same ACPI HID is used for different configurations check PTYP
  62          * to ensure that we are dealing with the expected config.
  63          */
  64         if (ptyp != EXPECTED_PTYPE)
  65                 return -ENODEV;
  66
  67         /* Check presence of INT34D3 (hardware-rev 3) expected for ptype == 4 */
  68         if (!acpi_dev_present("INT34D3", "1", 3)) {
  69                 dev_err(dev, "Error PTYPE == %d, but no INT34D3 device\n",
  70                         EXPECTED_PTYPE);
  71                 return -ENODEV;
  72         }
  73
  74         ret = cht_int33fe_count_i2c_clients(dev);
  75         if (ret < 0)
  76                 return ret;
  77
  78         switch (ret) {
  79         case 2:
  80                 return INT33FE_HW_MICROB;
  81         case 4:
  82                 return INT33FE_HW_TYPEC;
  83         default:
  84                 return -ENODEV;
  85         }
  86 }
  87
  88 static int cht_int33fe_probe(struct platform_device *pdev)
  89 {
  90         struct cht_int33fe_data *data;
  91         struct device *dev = &pdev->dev;
  92         int ret;
  93
  94         ret = cht_int33fe_check_hw_type(dev);
  95         if (ret < 0)
  96                 return ret;
  97
  98         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
  99         if (!data)
 100                 return -ENOMEM;
 101
 102         data->dev = dev;
 103
 104         switch (ret) {
 105         case INT33FE_HW_MICROB:
 106                 data->probe = cht_int33fe_microb_probe;
 107                 data->remove = cht_int33fe_microb_remove;
 108                 break;
 109
 110         case INT33FE_HW_TYPEC:
 111                 data->probe = cht_int33fe_typec_probe;
 112                 data->remove = cht_int33fe_typec_remove;
 113                 break;
 114         }
 115
 116         platform_set_drvdata(pdev, data);
 117
 118         return data->probe(data);
 119 }
 120
 121 static int cht_int33fe_remove(struct platform_device *pdev)
 122 {
 123         struct cht_int33fe_data *data = platform_get_drvdata(pdev);
 124
 125         return data->remove(data);
 126 }
 127
 128 static const struct acpi_device_id cht_int33fe_acpi_ids[] = {
 129         { "INT33FE", },
 130         { }
 131 };
 132 MODULE_DEVICE_TABLE(acpi, cht_int33fe_acpi_ids);
 133
 134 static struct platform_driver cht_int33fe_driver = {
 135         .driver = {
 136                 .name = "Intel Cherry Trail ACPI INT33FE driver",
 137                 .acpi_match_table = ACPI_PTR(cht_int33fe_acpi_ids),
 138         },
 139         .probe = cht_int33fe_probe,
 140         .remove = cht_int33fe_remove,
 141 };
 142
 143 module_platform_driver(cht_int33fe_driver);
 144
 145 MODULE_DESCRIPTION("Intel Cherry Trail ACPI INT33FE pseudo device driver");
 146 MODULE_AUTHOR("Yauhen Kharuzhy <jekhor@gmail.com>");
 147 MODULE_LICENSE("GPL v2");