drivers/platform/x86/intel/chtwc_int33fe.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Intel Cherry Trail ACPI INT33FE pseudo device driver
   4  *
   5  * Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com>
   6  *
   7  * Some Intel Cherry Trail based device which ship with Windows 10, have
   8  * this weird INT33FE ACPI device with a CRS table with 4 I2cSerialBusV2
   9  * resources, for 4 different chips attached to various I²C buses:
  10  * 1. The Whiskey Cove PMIC, which is also described by the INT34D3 ACPI device
  11  * 2. Maxim MAX17047 Fuel Gauge Controller
  12  * 3. FUSB302 USB Type-C Controller
  13  * 4. PI3USB30532 USB switch
  14  *
  15  * So this driver is a stub / pseudo driver whose only purpose is to
  16  * instantiate I²C clients for chips 2 - 4, so that standard I²C drivers
  17  * for these chips can bind to the them.
  18  */
  19
  20 #include <linux/dmi.h>
  21 #include <linux/i2c.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/pci.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/property.h>
  26 #include <linux/regulator/consumer.h>
  27 #include <linux/slab.h>
  28 #include <linux/usb/pd.h>
  29
  30 struct cht_int33fe_data {
  31         struct i2c_client *battery_fg;
  32         struct i2c_client *fusb302;
  33         struct i2c_client *pi3usb30532;
  34         struct fwnode_handle *dp;
  35 };
  36
  37 /*
  38  * Grrr, I severely dislike buggy BIOS-es. At least one BIOS enumerates
  39  * the max17047 both through the INT33FE ACPI device (it is right there
  40  * in the resources table) as well as through a separate MAX17047 device.
  41  *
  42  * These helpers are used to work around this by checking if an I²C client
  43  * for the max17047 has already been registered.
  44  */
  45 static int cht_int33fe_check_for_max17047(struct device *dev, void *data)
  46 {
  47         struct i2c_client **max17047 = data;
  48         struct acpi_device *adev;
  49
  50         adev = ACPI_COMPANION(dev);
  51         if (!adev)
  52                 return 0;
  53
  54         /* The MAX17047 ACPI node doesn't have an UID, so we don't check that */
  55         if (!acpi_dev_hid_uid_match(adev, "MAX17047", NULL))
  56                 return 0;
  57
  58         *max17047 = to_i2c_client(dev);
  59         return 1;
  60 }
  61
  62 static const char * const max17047_suppliers[] = { "bq24190-charger" };
  63
  64 static const struct property_entry max17047_properties[] = {
  65         PROPERTY_ENTRY_STRING_ARRAY("supplied-from", max17047_suppliers),
  66         { }
  67 };
  68
  69 static const struct software_node max17047_node = {
  70         .name = "max17047",
  71         .properties = max17047_properties,
  72 };
  73
  74 /*
  75  * We are not using inline property here because those are constant,
  76  * and we need to adjust this one at runtime to point to real
  77  * software node.
  78  */
  79 static struct software_node_ref_args fusb302_mux_refs[] = {
  80         { .node = NULL },
  81 };
  82
  83 static const struct property_entry fusb302_properties[] = {
  84         PROPERTY_ENTRY_STRING("linux,extcon-name", "cht_wcove_pwrsrc"),
  85         PROPERTY_ENTRY_REF_ARRAY("usb-role-switch", fusb302_mux_refs),
  86         { }
  87 };
  88
  89 static const struct software_node fusb302_node = {
  90         .name = "fusb302",
  91         .properties = fusb302_properties,
  92 };
  93
  94 #define PDO_FIXED_FLAGS \
  95         (PDO_FIXED_DUAL_ROLE | PDO_FIXED_DATA_SWAP | PDO_FIXED_USB_COMM)
  96
  97 static const u32 src_pdo[] = {
  98         PDO_FIXED(5000, 1500, PDO_FIXED_FLAGS),
  99 };
 100
 101 static const u32 snk_pdo[] = {
 102         PDO_FIXED(5000, 400, PDO_FIXED_FLAGS),
 103         PDO_VAR(5000, 12000, 3000),
 104 };
 105
 106 static const struct software_node pi3usb30532_node = {
 107         .name = "pi3usb30532",
 108 };
 109
 110 static const struct software_node displayport_node = {
 111         .name = "displayport",
 112 };
 113
 114 static const struct property_entry usb_connector_properties[] = {
 115         PROPERTY_ENTRY_STRING("data-role", "dual"),
 116         PROPERTY_ENTRY_STRING("power-role", "dual"),
 117         PROPERTY_ENTRY_STRING("try-power-role", "sink"),
 118         PROPERTY_ENTRY_U32_ARRAY("source-pdos", src_pdo),
 119         PROPERTY_ENTRY_U32_ARRAY("sink-pdos", snk_pdo),
 120         PROPERTY_ENTRY_U32("op-sink-microwatt", 2500000),
 121         PROPERTY_ENTRY_REF("orientation-switch", &pi3usb30532_node),
 122         PROPERTY_ENTRY_REF("mode-switch", &pi3usb30532_node),
 123         PROPERTY_ENTRY_REF("displayport", &displayport_node),
 124         { }
 125 };
 126
 127 static const struct software_node usb_connector_node = {
 128         .name = "connector",
 129         .parent = &fusb302_node,
 130         .properties = usb_connector_properties,
 131 };
 132
 133 static const struct software_node altmodes_node = {
 134         .name = "altmodes",
 135         .parent = &usb_connector_node,
 136 };
 137
 138 static const struct property_entry dp_altmode_properties[] = {
 139         PROPERTY_ENTRY_U16("svid", 0xff01),
 140         PROPERTY_ENTRY_U32("vdo", 0x0c0086),
 141         { }
 142 };
 143
 144 static const struct software_node dp_altmode_node = {
 145         .name = "displayport-altmode",
 146         .parent = &altmodes_node,
 147         .properties = dp_altmode_properties,
 148 };
 149
 150 static const struct software_node *node_group[] = {
 151         &fusb302_node,
 152         &max17047_node,
 153         &pi3usb30532_node,
 154         &displayport_node,
 155         &usb_connector_node,
 156         &altmodes_node,
 157         &dp_altmode_node,
 158         NULL
 159 };
 160
 161 static int cht_int33fe_setup_dp(struct cht_int33fe_data *data)
 162 {
 163         struct fwnode_handle *fwnode;
 164         struct pci_dev *pdev;
 165
 166         fwnode = software_node_fwnode(&displayport_node);
 167         if (!fwnode)
 168                 return -ENODEV;
 169
 170         /* First let's find the GPU PCI device */
 171         pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
 172         if (!pdev || pdev->vendor != PCI_VENDOR_ID_INTEL) {
 173                 pci_dev_put(pdev);
 174                 return -ENODEV;
 175         }
 176
 177         /* Then the DP-2 child device node */
 178         data->dp = device_get_named_child_node(&pdev->dev, "DD04");
 179         pci_dev_put(pdev);
 180         if (!data->dp)
 181                 return -ENODEV;
 182
 183         fwnode->secondary = ERR_PTR(-ENODEV);
 184         data->dp->secondary = fwnode;
 185
 186         return 0;
 187 }
 188
 189 static void cht_int33fe_remove_nodes(struct cht_int33fe_data *data)
 190 {
 191         software_node_unregister_node_group(node_group);
 192
 193         if (fusb302_mux_refs[0].node) {
 194                 fwnode_handle_put(software_node_fwnode(fusb302_mux_refs[0].node));
 195                 fusb302_mux_refs[0].node = NULL;
 196         }
 197
 198         if (data->dp) {
 199                 data->dp->secondary = NULL;
 200                 fwnode_handle_put(data->dp);
 201                 data->dp = NULL;
 202         }
 203 }
 204
 205 static int cht_int33fe_add_nodes(struct cht_int33fe_data *data)
 206 {
 207         const struct software_node *mux_ref_node;
 208         int ret;
 209
 210         /*
 211          * There is no ACPI device node for the USB role mux, so we need to wait
 212          * until the mux driver has created software node for the mux device.
 213          * It means we depend on the mux driver. This function will return
 214          * -EPROBE_DEFER until the mux device is registered.
 215          */
 216         mux_ref_node = software_node_find_by_name(NULL, "intel-xhci-usb-sw");
 217         if (!mux_ref_node)
 218                 return -EPROBE_DEFER;
 219
 220         /*
 221          * Update node used in "usb-role-switch" property. Note that we
 222          * rely on software_node_register_node_group() to use the original
 223          * instance of properties instead of copying them.
 224          */
 225         fusb302_mux_refs[0].node = mux_ref_node;
 226
 227         ret = software_node_register_node_group(node_group);
 228         if (ret)
 229                 return ret;
 230
 231         /* The devices that are not created in this driver need extra steps. */
 232
 233         /*
 234          * The DP connector does have ACPI device node. In this case we can just
 235          * find that ACPI node and assign our node as the secondary node to it.
 236          */
 237         ret = cht_int33fe_setup_dp(data);
 238         if (ret)
 239                 goto err_remove_nodes;
 240
 241         return 0;
 242
 243 err_remove_nodes:
 244         cht_int33fe_remove_nodes(data);
 245
 246         return ret;
 247 }
 248
 249 static int
 250 cht_int33fe_register_max17047(struct device *dev, struct cht_int33fe_data *data)
 251 {
 252         struct i2c_client *max17047 = NULL;
 253         struct i2c_board_info board_info;
 254         struct fwnode_handle *fwnode;
 255         int ret;
 256
 257         fwnode = software_node_fwnode(&max17047_node);
 258         if (!fwnode)
 259                 return -ENODEV;
 260
 261         i2c_for_each_dev(&max17047, cht_int33fe_check_for_max17047);
 262         if (max17047) {
 263                 /* Pre-existing I²C client for the max17047, add device properties */
 264                 set_secondary_fwnode(&max17047->dev, fwnode);
 265                 /* And re-probe to get the new device properties applied */
 266                 ret = device_reprobe(&max17047->dev);
 267                 if (ret)
 268                         dev_warn(dev, "Reprobing max17047 error: %d\n", ret);
 269                 return 0;
 270         }
 271
 272         memset(&board_info, 0, sizeof(board_info));
 273         strscpy(board_info.type, "max17047");
 274         board_info.dev_name = "max17047";
 275         board_info.fwnode = fwnode;
 276         data->battery_fg = i2c_acpi_new_device(dev, 1, &board_info);
 277
 278         return PTR_ERR_OR_ZERO(data->battery_fg);
 279 }
 280
 281 static const struct dmi_system_id cht_int33fe_typec_ids[] = {
 282         {
 283                 /*
 284                  * GPD win / GPD pocket mini laptops
 285                  *
 286                  * This DMI match may not seem unique, but it is. In the 67000+
 287                  * DMI decode dumps from linux-hardware.org only 116 have
 288                  * board_vendor set to "AMI Corporation" and of those 116 only
 289                  * the GPD win's and pocket's board_name is "Default string".
 290                  */
 291                 .matches = {
 292                         DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
 293                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "Default string"),
 294                         DMI_EXACT_MATCH(DMI_BOARD_SERIAL, "Default string"),
 295                         DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Default string"),
 296                 },
 297         },
 298         { }
 299 };
 300 MODULE_DEVICE_TABLE(dmi, cht_int33fe_typec_ids);
 301
 302 static int cht_int33fe_typec_probe(struct platform_device *pdev)
 303 {
 304         struct i2c_board_info board_info;
 305         struct device *dev = &pdev->dev;
 306         struct cht_int33fe_data *data;
 307         struct fwnode_handle *fwnode;
 308         struct regulator *regulator;
 309         int fusb302_irq;
 310         int ret;
 311
 312         if (!dmi_check_system(cht_int33fe_typec_ids))
 313                 return -ENODEV;
 314
 315         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 316         if (!data)
 317                 return -ENOMEM;
 318
 319         /*
 320          * We expect the WC PMIC to be paired with a TI bq24292i charger-IC.
 321          * We check for the bq24292i vbus regulator here, this has 2 purposes:
 322          * 1) The bq24292i allows charging with up to 12V, setting the fusb302's
 323          *    max-snk voltage to 12V with another charger-IC is not good.
 324          * 2) For the fusb302 driver to get the bq24292i vbus regulator, the
 325          *    regulator-map, which is part of the bq24292i regulator_init_data,
 326          *    must be registered before the fusb302 is instantiated, otherwise
 327          *    it will end up with a dummy-regulator.
 328          * Note "cht_wc_usb_typec_vbus" comes from the regulator_init_data
 329          * which is defined in i2c-cht-wc.c from where the bq24292i I²C client
 330          * gets instantiated. We use regulator_get_optional here so that we
 331          * don't end up getting a dummy-regulator ourselves.
 332          */
 333         regulator = regulator_get_optional(dev, "cht_wc_usb_typec_vbus");
 334         if (IS_ERR(regulator)) {
 335                 ret = PTR_ERR(regulator);
 336                 return (ret == -ENODEV) ? -EPROBE_DEFER : ret;
 337         }
 338         regulator_put(regulator);
 339
 340         /* The FUSB302 uses the IRQ at index 1 and is the only IRQ user */
 341         fusb302_irq = acpi_dev_gpio_irq_get(ACPI_COMPANION(dev), 1);
 342         if (fusb302_irq < 0) {
 343                 if (fusb302_irq != -EPROBE_DEFER)
 344                         dev_err(dev, "Error getting FUSB302 irq\n");
 345                 return fusb302_irq;
 346         }
 347
 348         ret = cht_int33fe_add_nodes(data);
 349         if (ret)
 350                 return ret;
 351
 352         /* Work around BIOS bug, see comment on cht_int33fe_check_for_max17047() */
 353         ret = cht_int33fe_register_max17047(dev, data);
 354         if (ret)
 355                 goto out_remove_nodes;
 356
 357         fwnode = software_node_fwnode(&fusb302_node);
 358         if (!fwnode) {
 359                 ret = -ENODEV;
 360                 goto out_unregister_max17047;
 361         }
 362
 363         memset(&board_info, 0, sizeof(board_info));
 364         strscpy(board_info.type, "typec_fusb302");
 365         board_info.dev_name = "fusb302";
 366         board_info.fwnode = fwnode;
 367         board_info.irq = fusb302_irq;
 368
 369         data->fusb302 = i2c_acpi_new_device(dev, 2, &board_info);
 370         if (IS_ERR(data->fusb302)) {
 371                 ret = PTR_ERR(data->fusb302);
 372                 goto out_unregister_max17047;
 373         }
 374
 375         fwnode = software_node_fwnode(&pi3usb30532_node);
 376         if (!fwnode) {
 377                 ret = -ENODEV;
 378                 goto out_unregister_fusb302;
 379         }
 380
 381         memset(&board_info, 0, sizeof(board_info));
 382         board_info.dev_name = "pi3usb30532";
 383         board_info.fwnode = fwnode;
 384         strscpy(board_info.type, "pi3usb30532");
 385
 386         data->pi3usb30532 = i2c_acpi_new_device(dev, 3, &board_info);
 387         if (IS_ERR(data->pi3usb30532)) {
 388                 ret = PTR_ERR(data->pi3usb30532);
 389                 goto out_unregister_fusb302;
 390         }
 391
 392         platform_set_drvdata(pdev, data);
 393
 394         return 0;
 395
 396 out_unregister_fusb302:
 397         i2c_unregister_device(data->fusb302);
 398
 399 out_unregister_max17047:
 400         i2c_unregister_device(data->battery_fg);
 401
 402 out_remove_nodes:
 403         cht_int33fe_remove_nodes(data);
 404
 405         return ret;
 406 }
 407
 408 static void cht_int33fe_typec_remove(struct platform_device *pdev)
 409 {
 410         struct cht_int33fe_data *data = platform_get_drvdata(pdev);
 411
 412         i2c_unregister_device(data->pi3usb30532);
 413         i2c_unregister_device(data->fusb302);
 414         i2c_unregister_device(data->battery_fg);
 415
 416         cht_int33fe_remove_nodes(data);
 417 }
 418
 419 static const struct acpi_device_id cht_int33fe_acpi_ids[] = {
 420         { "INT33FE", },
 421         { }
 422 };
 423
 424 static struct platform_driver cht_int33fe_typec_driver = {
 425         .driver = {
 426                 .name = "Intel Cherry Trail ACPI INT33FE Type-C driver",
 427                 .acpi_match_table = ACPI_PTR(cht_int33fe_acpi_ids),
 428         },
 429         .probe = cht_int33fe_typec_probe,
 430         .remove = cht_int33fe_typec_remove,
 431 };
 432
 433 module_platform_driver(cht_int33fe_typec_driver);
 434
 435 MODULE_DESCRIPTION("Intel Cherry Trail ACPI INT33FE Type-C pseudo device driver");
 436 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
 437 MODULE_LICENSE("GPL v2");