swh:1:snp:49cd9498d6cccc5e78252c27dcb645bcf7bf0c91
Tip revision: bb6d3fb354c5ee8d6bde2d576eb7220ea09862b9 authored by Linus Torvalds on 10 February 2020, 00:08:48 UTC
Linux 5.6-rc1
Linux 5.6-rc1
Tip revision: bb6d3fb
intel_cht_int33fe_typec.c
// 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 busses:
* 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/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/usb/pd.h>
#include "intel_cht_int33fe_common.h"
enum {
INT33FE_NODE_FUSB302,
INT33FE_NODE_MAX17047,
INT33FE_NODE_PI3USB30532,
INT33FE_NODE_DISPLAYPORT,
INT33FE_NODE_USB_CONNECTOR,
INT33FE_NODE_MAX,
};
/*
* Grrr I severly 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;
const char *hid;
adev = ACPI_COMPANION(dev);
if (!adev)
return 0;
hid = acpi_device_hid(adev);
/* The MAX17047 ACPI node doesn't have an UID, so we don't check that */
if (strcmp(hid, "MAX17047"))
return 0;
*max17047 = to_i2c_client(dev);
return 1;
}
static const char * const max17047_suppliers[] = { "bq24190-charger" };
static const struct property_entry max17047_props[] = {
PROPERTY_ENTRY_STRING_ARRAY("supplied-from", max17047_suppliers),
{ }
};
/*
* 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_props[] = {
PROPERTY_ENTRY_STRING("linux,extcon-name", "cht_wcove_pwrsrc"),
PROPERTY_ENTRY_REF_ARRAY("usb-role-switch", fusb302_mux_refs),
{ }
};
#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 nodes[];
static const struct property_entry usb_connector_props[] = {
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",
&nodes[INT33FE_NODE_PI3USB30532]),
PROPERTY_ENTRY_REF("mode-switch",
&nodes[INT33FE_NODE_PI3USB30532]),
PROPERTY_ENTRY_REF("displayport",
&nodes[INT33FE_NODE_DISPLAYPORT]),
{ }
};
static const struct software_node nodes[] = {
{ "fusb302", NULL, fusb302_props },
{ "max17047", NULL, max17047_props },
{ "pi3usb30532" },
{ "displayport" },
{ "connector", &nodes[0], usb_connector_props },
{ }
};
static int cht_int33fe_setup_dp(struct cht_int33fe_data *data)
{
struct fwnode_handle *fwnode;
struct pci_dev *pdev;
fwnode = software_node_fwnode(&nodes[INT33FE_NODE_DISPLAYPORT]);
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_nodes(nodes);
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_nodes(nodes);
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(&nodes[INT33FE_NODE_MAX17047]);
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-props */
fwnode->secondary = ERR_PTR(-ENODEV);
max17047->dev.fwnode->secondary = fwnode;
/* And re-probe to get the new device-props 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(&nodes[INT33FE_NODE_FUSB302]);
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(&nodes[INT33FE_NODE_PI3USB30532]);
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;
}