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