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Subject[PATCH v2 1/1] platform/x86/intel_cht_int33fe: Split code to USB TypeB and TypeC variants
Date
Existing intel_cht_int33fe ACPI pseudo-device driver assumes that
hardware has TypeC connector and register related devices described as
I2C connections in the _CRS resource.

There is at least one hardware (Lenovo Yoga Book YB1-91L/F) with micro
USB B connector exists. It has INT33FE device in the DSDT table but
there are only two I2C connection described: PMIC and BQ27452 battery
fuel gauge.

Splitting existing INT33FE driver allow to maintain code for USB type B
(AB) connector variant separately and make it simpler.

Split driver to intel_cht_int33fe_common.c and
intel_cht_int33fe_{typeb,typec}.c. Compile all this source to one .ko
module to make user experience easier.

Signed-off-by: Yauhen Kharuzhy <jekhor@gmail.com>
---
drivers/platform/x86/Kconfig | 14 +-
drivers/platform/x86/Makefile | 4 +
.../platform/x86/intel_cht_int33fe_common.c | 148 ++++++++++++++++++
.../platform/x86/intel_cht_int33fe_common.h | 44 ++++++
.../platform/x86/intel_cht_int33fe_typeb.c | 64 ++++++++
...ht_int33fe.c => intel_cht_int33fe_typec.c} | 79 +---------
6 files changed, 278 insertions(+), 75 deletions(-)
create mode 100644 drivers/platform/x86/intel_cht_int33fe_common.c
create mode 100644 drivers/platform/x86/intel_cht_int33fe_common.h
create mode 100644 drivers/platform/x86/intel_cht_int33fe_typeb.c
rename drivers/platform/x86/{intel_cht_int33fe.c => intel_cht_int33fe_typec.c} (83%)

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 1b67bb578f9f..c7ce3f17ca70 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -926,18 +926,24 @@ config INTEL_CHT_INT33FE
depends on CHARGER_BQ24190=y || (CHARGER_BQ24190=m && m)
depends on USB_ROLES_INTEL_XHCI=y || (USB_ROLES_INTEL_XHCI=m && m)
depends on TYPEC_MUX_PI3USB30532=y || (TYPEC_MUX_PI3USB30532=m && m)
- ---help---
+ help
This driver add support for the INT33FE ACPI device found on
some Intel Cherry Trail devices.

+ There are two kinds of INT33FE ACPI device possible: for hardware
+ with USB TypeC and TypeB connectors. This driver supports both.
+
The INT33FE ACPI device has a CRS table with I2cSerialBusV2
- resources for 3 devices: Maxim MAX17047 Fuel Gauge Controller,
- FUSB302 USB Type-C Controller and PI3USB30532 USB switch.
+ resources for Fuel Gauge Controller and (in TypeC variant) FUSB302
+ USB Type-C Controller and PI3USB30532 USB switch.
This driver instantiates i2c-clients for these, so that standard
i2c drivers for these chips can bind to the them.

If you enable this driver it is advised to also select
- CONFIG_TYPEC_FUSB302=m and CONFIG_BATTERY_MAX17042=m.
+ CONFIG_BATTERY_BQ27XXX=m and CONFIG_BATTERY_BQ27XXX_I2C=m for TypeB
+ device and CONFIG_TYPEC_FUSB302=m and CONFIG_BATTERY_MAX17042=m
+ for TypeC device.
+

config INTEL_INT0002_VGPIO
tristate "Intel ACPI INT0002 Virtual GPIO driver"
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index 415104033060..f74664515d09 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -61,6 +61,10 @@ obj-$(CONFIG_TOSHIBA_BT_RFKILL) += toshiba_bluetooth.o
obj-$(CONFIG_TOSHIBA_HAPS) += toshiba_haps.o
obj-$(CONFIG_TOSHIBA_WMI) += toshiba-wmi.o
obj-$(CONFIG_INTEL_CHT_INT33FE) += intel_cht_int33fe.o
+intel_cht_int33fe-objs := intel_cht_int33fe_common.o \
+ intel_cht_int33fe_typec.o \
+ intel_cht_int33fe_typeb.o
+
obj-$(CONFIG_INTEL_INT0002_VGPIO) += intel_int0002_vgpio.o
obj-$(CONFIG_INTEL_HID_EVENT) += intel-hid.o
obj-$(CONFIG_INTEL_VBTN) += intel-vbtn.o
diff --git a/drivers/platform/x86/intel_cht_int33fe_common.c b/drivers/platform/x86/intel_cht_int33fe_common.c
new file mode 100644
index 000000000000..4a3d7ebd37dd
--- /dev/null
+++ b/drivers/platform/x86/intel_cht_int33fe_common.c
@@ -0,0 +1,148 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Common code for Intel Cherry Trail ACPI INT33FE pseudo device drivers
+ * (USB TypeB and TypeC connector variants).
+ *
+ * Copyright (c) 2019 Yauhen Kharuzhy <jekhor@gmail.com>
+ */
+
+#include <linux/acpi.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include "intel_cht_int33fe_common.h"
+
+#define EXPECTED_PTYPE 4
+
+static int cht_int33fe_i2c_res_filter(struct acpi_resource *ares, void *data)
+{
+ struct acpi_resource_i2c_serialbus *sb;
+ int *count = data;
+
+ if (i2c_acpi_get_i2c_resource(ares, &sb))
+ (*count)++;
+
+ return 1;
+}
+
+static int cht_int33fe_count_i2c_clients(struct device *dev)
+{
+ struct acpi_device *adev;
+ LIST_HEAD(resource_list);
+ int count = 0;
+
+ adev = ACPI_COMPANION(dev);
+ if (!adev)
+ return -EINVAL;
+
+ acpi_dev_get_resources(adev, &resource_list,
+ cht_int33fe_i2c_res_filter, &count);
+
+ acpi_dev_free_resource_list(&resource_list);
+
+ return count;
+}
+
+static int cht_int33fe_check_hw_type(struct device *dev)
+{
+ unsigned long long ptyp;
+ acpi_status status;
+ int ret;
+
+ status = acpi_evaluate_integer(ACPI_HANDLE(dev), "PTYP", NULL, &ptyp);
+ if (ACPI_FAILURE(status)) {
+ dev_err(dev, "Error getting PTYPE\n");
+ return -ENODEV;
+ }
+
+ /*
+ * The same ACPI HID is used for different configurations check PTYP
+ * to ensure that we are dealing with the expected config.
+ */
+ if (ptyp != EXPECTED_PTYPE)
+ return -ENODEV;
+
+ /* Check presence of INT34D3 (hardware-rev 3) expected for ptype == 4 */
+ if (!acpi_dev_present("INT34D3", "1", 3)) {
+ dev_err(dev, "Error PTYPE == %d, but no INT34D3 device\n",
+ EXPECTED_PTYPE);
+ return -ENODEV;
+ }
+
+ ret = cht_int33fe_count_i2c_clients(dev);
+ if (ret < 0)
+ return ret;
+
+ switch (ret) {
+ case 2:
+ return INT33FE_HW_TYPEB;
+ case 4:
+ return INT33FE_HW_TYPEC;
+ default:
+ return -ENODEV;
+ }
+}
+
+static int cht_int33fe_probe(struct platform_device *pdev)
+{
+ struct cht_int33fe_data *data;
+ struct device *dev = &pdev->dev;
+ int ret;
+
+ ret = cht_int33fe_check_hw_type(dev);
+ if (ret < 0)
+ return ret;
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->hw_type = ret;
+ data->dev = dev;
+
+ switch (data->hw_type) {
+ case INT33FE_HW_TYPEB:
+ data->probe = cht_int33fe_typeb_probe;
+ data->remove = cht_int33fe_typeb_remove;
+ break;
+
+ case INT33FE_HW_TYPEC:
+ data->probe = cht_int33fe_typec_probe;
+ data->remove = cht_int33fe_typec_remove;
+ break;
+ }
+
+ platform_set_drvdata(pdev, data);
+
+ return data->probe(data);
+}
+
+static int cht_int33fe_remove(struct platform_device *pdev)
+{
+ struct cht_int33fe_data *data = platform_get_drvdata(pdev);
+
+ return data->remove(data);
+}
+
+static const struct acpi_device_id cht_int33fe_acpi_ids[] = {
+ { "INT33FE", },
+ { }
+};
+MODULE_DEVICE_TABLE(acpi, cht_int33fe_acpi_ids);
+
+static struct platform_driver cht_int33fe_driver = {
+ .driver = {
+ .name = "Intel Cherry Trail ACPI INT33FE driver",
+ .acpi_match_table = ACPI_PTR(cht_int33fe_acpi_ids),
+ },
+ .probe = cht_int33fe_probe,
+ .remove = cht_int33fe_remove,
+};
+
+module_platform_driver(cht_int33fe_driver);
+
+MODULE_DESCRIPTION("Intel Cherry Trail ACPI INT33FE pseudo device driver");
+MODULE_AUTHOR("Yauhen Kharuzhy <jekhor@gmail.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/platform/x86/intel_cht_int33fe_common.h b/drivers/platform/x86/intel_cht_int33fe_common.h
new file mode 100644
index 000000000000..cb0cc4552017
--- /dev/null
+++ b/drivers/platform/x86/intel_cht_int33fe_common.h
@@ -0,0 +1,44 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Common code for Intel Cherry Trail ACPI INT33FE pseudo device drivers
+ * (microUSB and TypeC connector variants), header file
+ *
+ * Copyright (c) 2019 Yauhen Kharuzhy <jekhor@gmail.com>
+ */
+
+#ifndef _INTEL_CHT_INT33FE_COMMON_H
+#define _INTEL_CHT_INT33FE_COMMON_H
+
+#include <linux/device.h>
+#include <linux/fwnode.h>
+#include <linux/i2c.h>
+
+enum int33fe_hw_type {
+ INT33FE_HW_TYPEC,
+ INT33FE_HW_TYPEB,
+};
+
+struct cht_int33fe_data {
+ enum int33fe_hw_type hw_type;
+ struct device *dev;
+
+ int (*probe)(struct cht_int33fe_data *data);
+ int (*remove)(struct cht_int33fe_data *data);
+
+ struct i2c_client *battery_fg;
+
+ /* TypeC only */
+ struct i2c_client *fusb302;
+ struct i2c_client *pi3usb30532;
+
+ struct fwnode_handle *dp;
+ struct fwnode_handle *mux;
+};
+
+int cht_int33fe_typeb_probe(struct cht_int33fe_data *data);
+int cht_int33fe_typeb_remove(struct cht_int33fe_data *data);
+int cht_int33fe_typec_probe(struct cht_int33fe_data *data);
+int cht_int33fe_typec_remove(struct cht_int33fe_data *data);
+
+#endif /* _INTEL_CHT_INT33FE_COMMON_H */
+
diff --git a/drivers/platform/x86/intel_cht_int33fe_typeb.c b/drivers/platform/x86/intel_cht_int33fe_typeb.c
new file mode 100644
index 000000000000..905c29f2f714
--- /dev/null
+++ b/drivers/platform/x86/intel_cht_int33fe_typeb.c
@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Intel Cherry Trail ACPI INT33FE pseudo device driver for devices with
+ * microUSB connector (e.g. without of FUSB302 USB Type-C controller)
+ *
+ * Copyright (C) 2019 Yauhen Kharuzhy <jekhor@gmail.com>
+ *
+ * At least one Intel Cherry Trail based device which ship with Windows 10
+ * (Lenovo YogaBook YB1-X91L/F tablet), have this weird INT33FE ACPI device
+ * with a CRS table with 2 I2cSerialBusV2 resources, for 2 different chips
+ * attached to various i2c busses:
+ * 1. The Whiskey Cove pmic, which is also described by the INT34D3 ACPI device
+ * 2. TI BQ27542 Fuel Gauge Controller
+ *
+ * So this driver is a stub / pseudo driver whose only purpose is to
+ * instantiate i2c-client for battery fuel gauge, so that standard i2c driver
+ * for these chip can bind to the it.
+ */
+
+#include <linux/acpi.h>
+#include <linux/i2c.h>
+#include <linux/module.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"
+
+static const char * const bq27xxx_suppliers[] = { "bq25890-charger" };
+
+static const struct property_entry bq27xxx_props[] = {
+ PROPERTY_ENTRY_STRING_ARRAY("supplied-from", bq27xxx_suppliers),
+ { }
+};
+
+int cht_int33fe_typeb_probe(struct cht_int33fe_data *data)
+{
+ struct device *dev = data->dev;
+ struct i2c_board_info board_info;
+
+ memset(&board_info, 0, sizeof(board_info));
+ strscpy(board_info.type, "bq27542", ARRAY_SIZE(board_info.type));
+ board_info.dev_name = "bq27542";
+ board_info.properties = bq27xxx_props;
+ data->battery_fg = i2c_acpi_new_device(dev, 1, &board_info);
+
+ if (IS_ERR(data->battery_fg)) {
+ dev_err(dev, "Failed to register battery fuel gauge: %ld\n",
+ PTR_ERR(data->battery_fg));
+ return PTR_ERR(data->battery_fg);
+ }
+
+ return 0;
+}
+
+int cht_int33fe_typeb_remove(struct cht_int33fe_data *data)
+{
+ i2c_unregister_device(data->battery_fg);
+
+ return 0;
+}
+
diff --git a/drivers/platform/x86/intel_cht_int33fe.c b/drivers/platform/x86/intel_cht_int33fe_typec.c
similarity index 83%
rename from drivers/platform/x86/intel_cht_int33fe.c
rename to drivers/platform/x86/intel_cht_int33fe_typec.c
index 4fbdff48a4b5..b59709418d6f 100644
--- a/drivers/platform/x86/intel_cht_int33fe.c
+++ b/drivers/platform/x86/intel_cht_int33fe_typec.c
@@ -17,17 +17,15 @@
* for these chips can bind to the them.
*/

-#include <linux/acpi.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
-#include <linux/module.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/usb/pd.h>

-#define EXPECTED_PTYPE 4
+#include "intel_cht_int33fe_common.h"

enum {
INT33FE_NODE_FUSB302,
@@ -39,15 +37,6 @@ enum {
INT33FE_NODE_MAX,
};

-struct cht_int33fe_data {
- struct i2c_client *max17047;
- struct i2c_client *fusb302;
- struct i2c_client *pi3usb30532;
-
- struct fwnode_handle *dp;
- struct fwnode_handle *mux;
-};
-
static const struct software_node nodes[];

static const struct software_node_ref_args pi3usb30532_ref = {
@@ -288,43 +277,20 @@ cht_int33fe_register_max17047(struct device *dev, struct cht_int33fe_data *data)
strlcpy(board_info.type, "max17047", I2C_NAME_SIZE);
board_info.dev_name = "max17047";
board_info.fwnode = fwnode;
- data->max17047 = i2c_acpi_new_device(dev, 1, &board_info);
+ data->battery_fg = i2c_acpi_new_device(dev, 1, &board_info);

- return PTR_ERR_OR_ZERO(data->max17047);
+ return PTR_ERR_OR_ZERO(data->battery_fg);
}

-static int cht_int33fe_probe(struct platform_device *pdev)
+int cht_int33fe_typec_probe(struct cht_int33fe_data *data)
{
- struct device *dev = &pdev->dev;
+ struct device *dev = data->dev;
struct i2c_board_info board_info;
- struct cht_int33fe_data *data;
struct fwnode_handle *fwnode;
struct regulator *regulator;
- unsigned long long ptyp;
- acpi_status status;
int fusb302_irq;
int ret;

- status = acpi_evaluate_integer(ACPI_HANDLE(dev), "PTYP", NULL, &ptyp);
- if (ACPI_FAILURE(status)) {
- dev_err(dev, "Error getting PTYPE\n");
- return -ENODEV;
- }
-
- /*
- * The same ACPI HID is used for different configurations check PTYP
- * to ensure that we are dealing with the expected config.
- */
- if (ptyp != EXPECTED_PTYPE)
- return -ENODEV;
-
- /* Check presence of INT34D3 (hardware-rev 3) expected for ptype == 4 */
- if (!acpi_dev_present("INT34D3", "1", 3)) {
- dev_err(dev, "Error PTYPE == %d, but no INT34D3 device\n",
- EXPECTED_PTYPE);
- return -ENODEV;
- }
-
/*
* 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:
@@ -354,10 +320,6 @@ static int cht_int33fe_probe(struct platform_device *pdev)
return fusb302_irq;
}

- data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
- if (!data)
- return -ENOMEM;
-
ret = cht_int33fe_add_nodes(data);
if (ret)
return ret;
@@ -402,15 +364,13 @@ static int cht_int33fe_probe(struct platform_device *pdev)
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->max17047);
+ i2c_unregister_device(data->battery_fg);

out_remove_nodes:
cht_int33fe_remove_nodes(data);
@@ -418,36 +378,13 @@ static int cht_int33fe_probe(struct platform_device *pdev)
return ret;
}

-static int cht_int33fe_remove(struct platform_device *pdev)
+int cht_int33fe_typec_remove(struct cht_int33fe_data *data)
{
- struct cht_int33fe_data *data = platform_get_drvdata(pdev);
-
i2c_unregister_device(data->pi3usb30532);
i2c_unregister_device(data->fusb302);
- i2c_unregister_device(data->max17047);
+ i2c_unregister_device(data->battery_fg);

cht_int33fe_remove_nodes(data);

return 0;
}
-
-static const struct acpi_device_id cht_int33fe_acpi_ids[] = {
- { "INT33FE", },
- { }
-};
-MODULE_DEVICE_TABLE(acpi, cht_int33fe_acpi_ids);
-
-static struct platform_driver cht_int33fe_driver = {
- .driver = {
- .name = "Intel Cherry Trail ACPI INT33FE driver",
- .acpi_match_table = ACPI_PTR(cht_int33fe_acpi_ids),
- },
- .probe = cht_int33fe_probe,
- .remove = cht_int33fe_remove,
-};
-
-module_platform_driver(cht_int33fe_driver);
-
-MODULE_DESCRIPTION("Intel Cherry Trail ACPI INT33FE pseudo device driver");
-MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
-MODULE_LICENSE("GPL v2");
--
2.20.1
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