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- // 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/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>
- #include "intel_cht_int33fe_common.h"
- /*
- * 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 *node_group[] = {
- &fusb302_node,
- &max17047_node,
- &pi3usb30532_node,
- &displayport_node,
- &usb_connector_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 child device node */
- data->dp = device_get_named_child_node(&pdev->dev, "DD02");
- 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);
- }
- int cht_int33fe_typec_probe(struct cht_int33fe_data *data)
- {
- struct device *dev = data->dev;
- struct i2c_board_info board_info;
- struct fwnode_handle *fwnode;
- struct regulator *regulator;
- int fusb302_irq;
- int ret;
- /*
- * 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;
- }
- int cht_int33fe_typec_remove(struct cht_int33fe_data *data)
- {
- i2c_unregister_device(data->pi3usb30532);
- i2c_unregister_device(data->fusb302);
- i2c_unregister_device(data->battery_fg);
- cht_int33fe_remove_nodes(data);
- return 0;
- }
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