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path: root/drivers/platform/x86/intel/chtwc_int33fe.c
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Diffstat (limited to 'drivers/platform/x86/intel/chtwc_int33fe.c')
-rw-r--r--drivers/platform/x86/intel/chtwc_int33fe.c437
1 files changed, 437 insertions, 0 deletions
diff --git a/drivers/platform/x86/intel/chtwc_int33fe.c b/drivers/platform/x86/intel/chtwc_int33fe.c
new file mode 100644
index 000000000000..0de509fbf020
--- /dev/null
+++ b/drivers/platform/x86/intel/chtwc_int33fe.c
@@ -0,0 +1,437 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Intel Cherry Trail ACPI INT33FE pseudo device driver
+ *
+ * Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com>
+ *
+ * Some Intel Cherry Trail based device which ship with Windows 10, have
+ * this weird INT33FE ACPI device with a CRS table with 4 I2cSerialBusV2
+ * resources, for 4 different chips attached to various I²C buses:
+ * 1. The Whiskey Cove PMIC, which is also described by the INT34D3 ACPI device
+ * 2. Maxim MAX17047 Fuel Gauge Controller
+ * 3. FUSB302 USB Type-C Controller
+ * 4. PI3USB30532 USB switch
+ *
+ * So this driver is a stub / pseudo driver whose only purpose is to
+ * instantiate I²C clients for chips 2 - 4, so that standard I²C drivers
+ * for these chips can bind to the them.
+ */
+
+#include <linux/dmi.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+#include <linux/usb/pd.h>
+
+struct cht_int33fe_data {
+ struct i2c_client *battery_fg;
+ struct i2c_client *fusb302;
+ struct i2c_client *pi3usb30532;
+ struct fwnode_handle *dp;
+};
+
+/*
+ * Grrr, I severely dislike buggy BIOS-es. At least one BIOS enumerates
+ * the max17047 both through the INT33FE ACPI device (it is right there
+ * in the resources table) as well as through a separate MAX17047 device.
+ *
+ * These helpers are used to work around this by checking if an I²C client
+ * for the max17047 has already been registered.
+ */
+static int cht_int33fe_check_for_max17047(struct device *dev, void *data)
+{
+ struct i2c_client **max17047 = data;
+ struct acpi_device *adev;
+
+ adev = ACPI_COMPANION(dev);
+ if (!adev)
+ return 0;
+
+ /* The MAX17047 ACPI node doesn't have an UID, so we don't check that */
+ if (!acpi_dev_hid_uid_match(adev, "MAX17047", NULL))
+ return 0;
+
+ *max17047 = to_i2c_client(dev);
+ return 1;
+}
+
+static const char * const max17047_suppliers[] = { "bq24190-charger" };
+
+static const struct property_entry max17047_properties[] = {
+ PROPERTY_ENTRY_STRING_ARRAY("supplied-from", max17047_suppliers),
+ { }
+};
+
+static const struct software_node max17047_node = {
+ .name = "max17047",
+ .properties = max17047_properties,
+};
+
+/*
+ * We are not using inline property here because those are constant,
+ * and we need to adjust this one at runtime to point to real
+ * software node.
+ */
+static struct software_node_ref_args fusb302_mux_refs[] = {
+ { .node = NULL },
+};
+
+static const struct property_entry fusb302_properties[] = {
+ PROPERTY_ENTRY_STRING("linux,extcon-name", "cht_wcove_pwrsrc"),
+ PROPERTY_ENTRY_REF_ARRAY("usb-role-switch", fusb302_mux_refs),
+ { }
+};
+
+static const struct software_node fusb302_node = {
+ .name = "fusb302",
+ .properties = fusb302_properties,
+};
+
+#define PDO_FIXED_FLAGS \
+ (PDO_FIXED_DUAL_ROLE | PDO_FIXED_DATA_SWAP | PDO_FIXED_USB_COMM)
+
+static const u32 src_pdo[] = {
+ PDO_FIXED(5000, 1500, PDO_FIXED_FLAGS),
+};
+
+static const u32 snk_pdo[] = {
+ PDO_FIXED(5000, 400, PDO_FIXED_FLAGS),
+ PDO_VAR(5000, 12000, 3000),
+};
+
+static const struct software_node pi3usb30532_node = {
+ .name = "pi3usb30532",
+};
+
+static const struct software_node displayport_node = {
+ .name = "displayport",
+};
+
+static const struct property_entry usb_connector_properties[] = {
+ PROPERTY_ENTRY_STRING("data-role", "dual"),
+ PROPERTY_ENTRY_STRING("power-role", "dual"),
+ PROPERTY_ENTRY_STRING("try-power-role", "sink"),
+ PROPERTY_ENTRY_U32_ARRAY("source-pdos", src_pdo),
+ PROPERTY_ENTRY_U32_ARRAY("sink-pdos", snk_pdo),
+ PROPERTY_ENTRY_U32("op-sink-microwatt", 2500000),
+ PROPERTY_ENTRY_REF("orientation-switch", &pi3usb30532_node),
+ PROPERTY_ENTRY_REF("mode-switch", &pi3usb30532_node),
+ PROPERTY_ENTRY_REF("displayport", &displayport_node),
+ { }
+};
+
+static const struct software_node usb_connector_node = {
+ .name = "connector",
+ .parent = &fusb302_node,
+ .properties = usb_connector_properties,
+};
+
+static const struct software_node altmodes_node = {
+ .name = "altmodes",
+ .parent = &usb_connector_node,
+};
+
+static const struct property_entry dp_altmode_properties[] = {
+ PROPERTY_ENTRY_U32("svid", 0xff01),
+ PROPERTY_ENTRY_U32("vdo", 0x0c0086),
+ { }
+};
+
+static const struct software_node dp_altmode_node = {
+ .name = "displayport-altmode",
+ .parent = &altmodes_node,
+ .properties = dp_altmode_properties,
+};
+
+static const struct software_node *node_group[] = {
+ &fusb302_node,
+ &max17047_node,
+ &pi3usb30532_node,
+ &displayport_node,
+ &usb_connector_node,
+ &altmodes_node,
+ &dp_altmode_node,
+ NULL
+};
+
+static int cht_int33fe_setup_dp(struct cht_int33fe_data *data)
+{
+ struct fwnode_handle *fwnode;
+ struct pci_dev *pdev;
+
+ fwnode = software_node_fwnode(&displayport_node);
+ if (!fwnode)
+ return -ENODEV;
+
+ /* First let's find the GPU PCI device */
+ pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
+ if (!pdev || pdev->vendor != PCI_VENDOR_ID_INTEL) {
+ pci_dev_put(pdev);
+ return -ENODEV;
+ }
+
+ /* Then the DP-2 child device node */
+ data->dp = device_get_named_child_node(&pdev->dev, "DD04");
+ pci_dev_put(pdev);
+ if (!data->dp)
+ return -ENODEV;
+
+ fwnode->secondary = ERR_PTR(-ENODEV);
+ data->dp->secondary = fwnode;
+
+ return 0;
+}
+
+static void cht_int33fe_remove_nodes(struct cht_int33fe_data *data)
+{
+ software_node_unregister_node_group(node_group);
+
+ if (fusb302_mux_refs[0].node) {
+ fwnode_handle_put(software_node_fwnode(fusb302_mux_refs[0].node));
+ fusb302_mux_refs[0].node = NULL;
+ }
+
+ if (data->dp) {
+ data->dp->secondary = NULL;
+ fwnode_handle_put(data->dp);
+ data->dp = NULL;
+ }
+}
+
+static int cht_int33fe_add_nodes(struct cht_int33fe_data *data)
+{
+ const struct software_node *mux_ref_node;
+ int ret;
+
+ /*
+ * There is no ACPI device node for the USB role mux, so we need to wait
+ * until the mux driver has created software node for the mux device.
+ * It means we depend on the mux driver. This function will return
+ * -EPROBE_DEFER until the mux device is registered.
+ */
+ mux_ref_node = software_node_find_by_name(NULL, "intel-xhci-usb-sw");
+ if (!mux_ref_node)
+ return -EPROBE_DEFER;
+
+ /*
+ * Update node used in "usb-role-switch" property. Note that we
+ * rely on software_node_register_nodes() to use the original
+ * instance of properties instead of copying them.
+ */
+ fusb302_mux_refs[0].node = mux_ref_node;
+
+ ret = software_node_register_node_group(node_group);
+ if (ret)
+ return ret;
+
+ /* The devices that are not created in this driver need extra steps. */
+
+ /*
+ * The DP connector does have ACPI device node. In this case we can just
+ * find that ACPI node and assign our node as the secondary node to it.
+ */
+ ret = cht_int33fe_setup_dp(data);
+ if (ret)
+ goto err_remove_nodes;
+
+ return 0;
+
+err_remove_nodes:
+ cht_int33fe_remove_nodes(data);
+
+ return ret;
+}
+
+static int
+cht_int33fe_register_max17047(struct device *dev, struct cht_int33fe_data *data)
+{
+ struct i2c_client *max17047 = NULL;
+ struct i2c_board_info board_info;
+ struct fwnode_handle *fwnode;
+ int ret;
+
+ fwnode = software_node_fwnode(&max17047_node);
+ if (!fwnode)
+ return -ENODEV;
+
+ i2c_for_each_dev(&max17047, cht_int33fe_check_for_max17047);
+ if (max17047) {
+ /* Pre-existing I²C client for the max17047, add device properties */
+ set_secondary_fwnode(&max17047->dev, fwnode);
+ /* And re-probe to get the new device properties applied */
+ ret = device_reprobe(&max17047->dev);
+ if (ret)
+ dev_warn(dev, "Reprobing max17047 error: %d\n", ret);
+ return 0;
+ }
+
+ memset(&board_info, 0, sizeof(board_info));
+ strlcpy(board_info.type, "max17047", I2C_NAME_SIZE);
+ board_info.dev_name = "max17047";
+ board_info.fwnode = fwnode;
+ data->battery_fg = i2c_acpi_new_device(dev, 1, &board_info);
+
+ return PTR_ERR_OR_ZERO(data->battery_fg);
+}
+
+static const struct dmi_system_id cht_int33fe_typec_ids[] = {
+ {
+ /*
+ * GPD win / GPD pocket mini laptops
+ *
+ * This DMI match may not seem unique, but it is. In the 67000+
+ * DMI decode dumps from linux-hardware.org only 116 have
+ * board_vendor set to "AMI Corporation" and of those 116 only
+ * the GPD win's and pocket's board_name is "Default string".
+ */
+ .matches = {
+ DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
+ DMI_EXACT_MATCH(DMI_BOARD_NAME, "Default string"),
+ DMI_EXACT_MATCH(DMI_BOARD_SERIAL, "Default string"),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Default string"),
+ },
+ },
+ { }
+};
+MODULE_DEVICE_TABLE(dmi, cht_int33fe_typec_ids);
+
+static int cht_int33fe_typec_probe(struct platform_device *pdev)
+{
+ struct i2c_board_info board_info;
+ struct device *dev = &pdev->dev;
+ struct cht_int33fe_data *data;
+ struct fwnode_handle *fwnode;
+ struct regulator *regulator;
+ int fusb302_irq;
+ int ret;
+
+ if (!dmi_check_system(cht_int33fe_typec_ids))
+ return -ENODEV;
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ /*
+ * We expect the WC PMIC to be paired with a TI bq24292i charger-IC.
+ * We check for the bq24292i vbus regulator here, this has 2 purposes:
+ * 1) The bq24292i allows charging with up to 12V, setting the fusb302's
+ * max-snk voltage to 12V with another charger-IC is not good.
+ * 2) For the fusb302 driver to get the bq24292i vbus regulator, the
+ * regulator-map, which is part of the bq24292i regulator_init_data,
+ * must be registered before the fusb302 is instantiated, otherwise
+ * it will end up with a dummy-regulator.
+ * Note "cht_wc_usb_typec_vbus" comes from the regulator_init_data
+ * which is defined in i2c-cht-wc.c from where the bq24292i I²C client
+ * gets instantiated. We use regulator_get_optional here so that we
+ * don't end up getting a dummy-regulator ourselves.
+ */
+ regulator = regulator_get_optional(dev, "cht_wc_usb_typec_vbus");
+ if (IS_ERR(regulator)) {
+ ret = PTR_ERR(regulator);
+ return (ret == -ENODEV) ? -EPROBE_DEFER : ret;
+ }
+ regulator_put(regulator);
+
+ /* The FUSB302 uses the IRQ at index 1 and is the only IRQ user */
+ fusb302_irq = acpi_dev_gpio_irq_get(ACPI_COMPANION(dev), 1);
+ if (fusb302_irq < 0) {
+ if (fusb302_irq != -EPROBE_DEFER)
+ dev_err(dev, "Error getting FUSB302 irq\n");
+ return fusb302_irq;
+ }
+
+ ret = cht_int33fe_add_nodes(data);
+ if (ret)
+ return ret;
+
+ /* Work around BIOS bug, see comment on cht_int33fe_check_for_max17047() */
+ ret = cht_int33fe_register_max17047(dev, data);
+ if (ret)
+ goto out_remove_nodes;
+
+ fwnode = software_node_fwnode(&fusb302_node);
+ if (!fwnode) {
+ ret = -ENODEV;
+ goto out_unregister_max17047;
+ }
+
+ memset(&board_info, 0, sizeof(board_info));
+ strlcpy(board_info.type, "typec_fusb302", I2C_NAME_SIZE);
+ board_info.dev_name = "fusb302";
+ board_info.fwnode = fwnode;
+ board_info.irq = fusb302_irq;
+
+ data->fusb302 = i2c_acpi_new_device(dev, 2, &board_info);
+ if (IS_ERR(data->fusb302)) {
+ ret = PTR_ERR(data->fusb302);
+ goto out_unregister_max17047;
+ }
+
+ fwnode = software_node_fwnode(&pi3usb30532_node);
+ if (!fwnode) {
+ ret = -ENODEV;
+ goto out_unregister_fusb302;
+ }
+
+ memset(&board_info, 0, sizeof(board_info));
+ board_info.dev_name = "pi3usb30532";
+ board_info.fwnode = fwnode;
+ strlcpy(board_info.type, "pi3usb30532", I2C_NAME_SIZE);
+
+ data->pi3usb30532 = i2c_acpi_new_device(dev, 3, &board_info);
+ if (IS_ERR(data->pi3usb30532)) {
+ ret = PTR_ERR(data->pi3usb30532);
+ goto out_unregister_fusb302;
+ }
+
+ return 0;
+
+out_unregister_fusb302:
+ i2c_unregister_device(data->fusb302);
+
+out_unregister_max17047:
+ i2c_unregister_device(data->battery_fg);
+
+out_remove_nodes:
+ cht_int33fe_remove_nodes(data);
+
+ return ret;
+}
+
+static int cht_int33fe_typec_remove(struct platform_device *pdev)
+{
+ struct cht_int33fe_data *data = platform_get_drvdata(pdev);
+
+ i2c_unregister_device(data->pi3usb30532);
+ i2c_unregister_device(data->fusb302);
+ i2c_unregister_device(data->battery_fg);
+
+ cht_int33fe_remove_nodes(data);
+
+ return 0;
+}
+
+static const struct acpi_device_id cht_int33fe_acpi_ids[] = {
+ { "INT33FE", },
+ { }
+};
+
+static struct platform_driver cht_int33fe_typec_driver = {
+ .driver = {
+ .name = "Intel Cherry Trail ACPI INT33FE Type-C driver",
+ .acpi_match_table = ACPI_PTR(cht_int33fe_acpi_ids),
+ },
+ .probe = cht_int33fe_typec_probe,
+ .remove = cht_int33fe_typec_remove,
+};
+
+module_platform_driver(cht_int33fe_typec_driver);
+
+MODULE_DESCRIPTION("Intel Cherry Trail ACPI INT33FE Type-C pseudo device driver");
+MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
+MODULE_LICENSE("GPL v2");