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Date: Mon, 18 Jan 2021 00:34:27 +0000
From: Daniel Scally <djrscally@...il.com>
To: linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
linux-gpio@...r.kernel.org, linux-i2c@...r.kernel.org,
platform-driver-x86@...r.kernel.org, devel@...ica.org
Cc: rjw@...ysocki.net, lenb@...nel.org, andy@...nel.org,
mika.westerberg@...ux.intel.com, linus.walleij@...aro.org,
bgolaszewski@...libre.com, wsa@...nel.org, lee.jones@...aro.org,
hdegoede@...hat.com, mgross@...ux.intel.com,
robert.moore@...el.com, erik.kaneda@...el.com,
sakari.ailus@...ux.intel.com, andriy.shevchenko@...ux.intel.com,
laurent.pinchart@...asonboard.com, kieran.bingham@...asonboard.com
Subject: [PATCH v2 6/7] platform: x86: Add intel_skl_int3472 driver
ACPI devices with _HID INT3472 are currently matched to the tps68470
driver, however this does not cover all situations in which that _HID
occurs. We've encountered three possibilities:
1. On Chrome OS devices, an ACPI device with _HID INT3472 (representing
a physical tps68470 device) that requires a GPIO and OpRegion driver
2. On devices designed for Windows, an ACPI device with _HID INT3472
(again representing a physical tps68470 device) which requires GPIO,
Clock and Regulator drivers.
3. On other devices designed for Windows, an ACPI device with _HID
INT3472 which does NOT represent a physical tps68470, and is instead
used as a dummy device to group some system GPIO lines which are meant
to be consumed by the sensor that is dependent on this entry.
This commit adds a new module, registering a platform driver to deal
with the 3rd scenario plus an i2c-driver to deal with #1 and #2, by
querying the CLDB buffer found against INT3472 entries to determine
which is most appropriate.
Suggested-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Daniel Scally <djrscally@...il.com>
---
Changes in v2:
- Switched to a module registering a platform driver to run
the dummy ACPI devices, plus an i2c driver to replace and extend
the existing tps68470 driver
- Added clock handling functions to the int3472-discrete driver
- A whole bunch of other changes too numerous to enumerate
MAINTAINERS | 5 +
drivers/platform/x86/Kconfig | 25 +
drivers/platform/x86/Makefile | 4 +
.../platform/x86/intel_skl_int3472_common.c | 100 ++++
.../platform/x86/intel_skl_int3472_common.h | 100 ++++
.../platform/x86/intel_skl_int3472_discrete.c | 496 ++++++++++++++++++
.../platform/x86/intel_skl_int3472_tps68470.c | 145 +++++
7 files changed, 875 insertions(+)
create mode 100644 drivers/platform/x86/intel_skl_int3472_common.c
create mode 100644 drivers/platform/x86/intel_skl_int3472_common.h
create mode 100644 drivers/platform/x86/intel_skl_int3472_discrete.c
create mode 100644 drivers/platform/x86/intel_skl_int3472_tps68470.c
diff --git a/MAINTAINERS b/MAINTAINERS
index a091b496fdd8..c4ed8c3bc58e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9147,6 +9147,11 @@ S: Maintained
F: arch/x86/include/asm/intel_scu_ipc.h
F: drivers/platform/x86/intel_scu_*
+INTEL SKL INT3472 ACPI DEVICE DRIVER
+M: Daniel Scally <djrscally@...il.com>
+S: Maintained
+F: drivers/platform/x86/intel_skl_int3472_*
+
INTEL SPEED SELECT TECHNOLOGY
M: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
L: platform-driver-x86@...r.kernel.org
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 91e6176cdfbd..916b077df2d5 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -844,6 +844,31 @@ config INTEL_CHT_INT33FE
device and CONFIG_TYPEC_FUSB302=m and CONFIG_BATTERY_MAX17042=m
for Type-C device.
+config INTEL_SKL_INT3472
+ tristate "Intel SkyLake ACPI INT3472 Driver"
+ depends on X86 && ACPI
+ select REGMAP_I2C
+ help
+ This driver adds support for the INT3472 ACPI devices found on some
+ Intel SkyLake devices.
+
+ There are 3 kinds of INT3472 ACPI device possible; two for devices
+ designed for Windows (either with or without a physical tps68470
+ PMIC) and one designed for Chrome OS. This driver handles all three
+ situations by discovering information it needs to discern them at
+ runtime.
+
+ If your device was designed for Chrome OS, this driver will provide
+ an ACPI operation region, which must be available before any of the
+ devices using this are probed. For this reason, you should select Y
+ if your device was designed for ChromeOS. This option also configures
+ the designware-i2c driver to be built-in, for the same reason.
+
+ Say Y or M here if you have a SkyLake device designed for use
+ with Windows or ChromeOS. Say N here if you are not sure.
+
+ The module will be named "intel-skl-int3472"
+
config INTEL_HID_EVENT
tristate "INTEL HID Event"
depends on ACPI
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index 581475f59819..ae29c66842ca 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -86,6 +86,10 @@ obj-$(CONFIG_INTEL_HID_EVENT) += intel-hid.o
obj-$(CONFIG_INTEL_INT0002_VGPIO) += intel_int0002_vgpio.o
obj-$(CONFIG_INTEL_MENLOW) += intel_menlow.o
obj-$(CONFIG_INTEL_OAKTRAIL) += intel_oaktrail.o
+obj-$(CONFIG_INTEL_SKL_INT3472) += intel_skl_int3472.o
+intel_skl_int3472-objs := intel_skl_int3472_common.o \
+ intel_skl_int3472_discrete.o \
+ intel_skl_int3472_tps68470.o
obj-$(CONFIG_INTEL_VBTN) += intel-vbtn.o
# MSI
diff --git a/drivers/platform/x86/intel_skl_int3472_common.c b/drivers/platform/x86/intel_skl_int3472_common.c
new file mode 100644
index 000000000000..08cb9d3c06aa
--- /dev/null
+++ b/drivers/platform/x86/intel_skl_int3472_common.c
@@ -0,0 +1,100 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Author: Dan Scally <djrscally@...il.com> */
+
+#include <linux/acpi.h>
+#include <linux/i2c.h>
+#include <linux/platform_device.h>
+
+#include "intel_skl_int3472_common.h"
+
+int skl_int3472_get_cldb_buffer(struct acpi_device *adev,
+ struct int3472_cldb *cldb)
+{
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+ acpi_handle handle = adev->handle;
+ union acpi_object *obj;
+ acpi_status status;
+ int ret = 0;
+
+ status = acpi_evaluate_object(handle, "CLDB", NULL, &buffer);
+ if (ACPI_FAILURE(status))
+ return -ENODEV;
+
+ obj = buffer.pointer;
+ if (!obj) {
+ dev_err(&adev->dev, "ACPI device has no CLDB object\n");
+ return -ENODEV;
+ }
+
+ if (obj->type != ACPI_TYPE_BUFFER) {
+ dev_err(&adev->dev, "CLDB object is not an ACPI buffer\n");
+ ret = -EINVAL;
+ goto out_free_buff;
+ }
+
+ if (obj->buffer.length > sizeof(*cldb)) {
+ dev_err(&adev->dev, "The CLDB buffer is too large\n");
+ ret = -EINVAL;
+ goto out_free_buff;
+ }
+
+ memcpy(cldb, obj->buffer.pointer, obj->buffer.length);
+
+out_free_buff:
+ kfree(buffer.pointer);
+ return ret;
+}
+
+static const struct acpi_device_id int3472_device_id[] = {
+ { "INT3472", 0 },
+ { },
+};
+MODULE_DEVICE_TABLE(acpi, int3472_device_id);
+
+static struct platform_driver int3472_discrete = {
+ .driver = {
+ .name = "int3472-discrete",
+ .acpi_match_table = int3472_device_id,
+ },
+ .probe = skl_int3472_discrete_probe,
+ .remove = skl_int3472_discrete_remove,
+};
+
+static struct i2c_driver int3472_tps68470 = {
+ .driver = {
+ .name = "int3472-tps68470",
+ .acpi_match_table = int3472_device_id,
+ },
+ .probe_new = skl_int3472_tps68470_probe,
+};
+
+static int skl_int3472_init(void)
+{
+ int ret = 0;
+
+ ret = platform_driver_register(&int3472_discrete);
+ if (ret)
+ return ret;
+
+ ret = i2c_register_driver(THIS_MODULE, &int3472_tps68470);
+ if (ret)
+ goto err_unregister_plat_drv;
+
+ return 0;
+
+err_unregister_plat_drv:
+ platform_driver_unregister(&int3472_discrete);
+ return ret;
+}
+module_init(skl_int3472_init);
+
+static void skl_int3472_exit(void)
+{
+ platform_driver_unregister(&int3472_discrete);
+ i2c_del_driver(&int3472_tps68470);
+}
+module_exit(skl_int3472_exit);
+
+MODULE_DESCRIPTION("Intel SkyLake INT3472 ACPI Device Driver");
+MODULE_AUTHOR("Daniel Scally <djrscally@...il.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/platform/x86/intel_skl_int3472_common.h b/drivers/platform/x86/intel_skl_int3472_common.h
new file mode 100644
index 000000000000..9acd0ce7aed9
--- /dev/null
+++ b/drivers/platform/x86/intel_skl_int3472_common.h
@@ -0,0 +1,100 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Author: Dan Scally <djrscally@...il.com> */
+#include <linux/regulator/machine.h>
+#include <linux/clk-provider.h>
+#include <linux/gpio/machine.h>
+#include <linux/regulator/driver.h>
+#include <linux/types.h>
+
+/* PMIC GPIO Types */
+#define INT3472_GPIO_TYPE_RESET 0x00
+#define INT3472_GPIO_TYPE_POWERDOWN 0x01
+#define INT3472_GPIO_TYPE_CLK_ENABLE 0x0c
+#define INT3472_GPIO_TYPE_POWER_ENABLE 0x0b
+#define INT3472_GPIO_TYPE_PRIVACY_LED 0x0d
+#define INT3472_PDEV_MAX_NAME_LEN 23
+#define INT3472_MAX_SENSOR_GPIOS 3
+#define GPIO_REGULATOR_NAME_LENGTH 27
+#define GPIO_REGULATOR_SUPPLY_NAME_LENGTH 9
+
+#define INT3472_REGULATOR(_NAME, _SUPPLY, _OPS) \
+ (const struct regulator_desc) { \
+ .name = _NAME, \
+ .supply_name = _SUPPLY, \
+ .id = 0, \
+ .type = REGULATOR_VOLTAGE, \
+ .ops = _OPS, \
+ .owner = THIS_MODULE, \
+ }
+
+#define INT3472_GPIO_FUNCTION_REMAP(_PIN, _FUNCTION) \
+ (const struct int3472_gpio_function_remap) { \
+ .documented = _PIN, \
+ .actual = _FUNCTION \
+ }
+
+#define to_int3472_clk(hw) \
+ container_of(hw, struct int3472_gpio_clock, clk_hw)
+
+struct int3472_cldb {
+ u8 version;
+ /*
+ * control logic type
+ * 0: UNKNOWN
+ * 1: DISCRETE(CRD-D)
+ * 2: PMIC TPS68470
+ * 3: PMIC uP6641
+ */
+ u8 control_logic_type;
+ u8 control_logic_id;
+ u8 sensor_card_sku;
+ u8 reserved[28];
+};
+
+struct int3472_gpio_regulator {
+ char regulator_name[GPIO_REGULATOR_NAME_LENGTH];
+ char supply_name[GPIO_REGULATOR_SUPPLY_NAME_LENGTH];
+ struct gpio_desc *gpio;
+ struct regulator_dev *rdev;
+ struct regulator_desc rdesc;
+};
+
+struct int3472_gpio_clock {
+ struct clk *clk;
+ struct clk_hw clk_hw;
+ struct clk_lookup *cl;
+ struct gpio_desc *gpio;
+};
+
+struct int3472_device {
+ struct acpi_device *adev;
+ struct platform_device *pdev;
+ struct acpi_device *sensor;
+ char *sensor_name;
+
+ unsigned int n_gpios; /* how many GPIOs have we seen */
+
+ struct int3472_gpio_regulator regulator;
+ struct int3472_gpio_clock clock;
+
+ unsigned int n_sensor_gpios; /* how many have we mapped to sensor */
+ bool gpios_mapped;
+ struct gpiod_lookup_table gpios;
+};
+
+struct int3472_gpio_function_remap {
+ char *documented;
+ char *actual;
+};
+
+struct int3472_sensor_config {
+ char *sensor_module_name;
+ struct regulator_consumer_supply supply_map;
+ const struct int3472_gpio_function_remap *function_maps;
+};
+
+int skl_int3472_discrete_probe(struct platform_device *pdev);
+int skl_int3472_discrete_remove(struct platform_device *pdev);
+int skl_int3472_tps68470_probe(struct i2c_client *client);
+int skl_int3472_get_cldb_buffer(struct acpi_device *adev,
+ struct int3472_cldb *cldb);
diff --git a/drivers/platform/x86/intel_skl_int3472_discrete.c b/drivers/platform/x86/intel_skl_int3472_discrete.c
new file mode 100644
index 000000000000..93d250dca92f
--- /dev/null
+++ b/drivers/platform/x86/intel_skl_int3472_discrete.c
@@ -0,0 +1,496 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Author: Dan Scally <djrscally@...il.com> */
+
+#include <linux/acpi.h>
+#include <linux/clkdev.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+
+#include "intel_skl_int3472_common.h"
+
+/* 79234640-9e10-4fea-a5c1-b5aa8b19756f */
+static const guid_t int3472_gpio_guid =
+ GUID_INIT(0x79234640, 0x9e10, 0x4fea,
+ 0xa5, 0xc1, 0xb5, 0xaa, 0x8b, 0x19, 0x75, 0x6f);
+
+/* 822ace8f-2814-4174-a56b-5f029fe079ee */
+static const guid_t cio2_sensor_module_guid =
+ GUID_INIT(0x822ace8f, 0x2814, 0x4174,
+ 0xa5, 0x6b, 0x5f, 0x02, 0x9f, 0xe0, 0x79, 0xee);
+
+/*
+ * Here follows platform specific mapping information that we can pass to
+ * the functions mapping resources to the sensors. Where the sensors have
+ * a power enable pin defined in DSDT we need to provide a supply name so
+ * the sensor drivers can find the regulator. Optionally, we can provide a
+ * NULL terminated array of function name mappings to deal with any platform
+ * specific deviations from the documented behaviour of GPIOs.
+ *
+ * Map a GPIO function name to NULL to prevent the driver from mapping that
+ * GPIO at all.
+ */
+
+static const struct int3472_gpio_function_remap ov2680_gpio_function_remaps[] = {
+ INT3472_GPIO_FUNCTION_REMAP("reset", NULL),
+ INT3472_GPIO_FUNCTION_REMAP("powerdown", "reset"),
+ { }
+};
+
+static struct int3472_sensor_config int3472_sensor_configs[] = {
+ /* Lenovo Miix 510-12ISK - OV2680, Front */
+ { "GNDF140809R", { 0 }, ov2680_gpio_function_remaps},
+ /* Lenovo Miix 510-12ISK - OV5648, Rear */
+ { "GEFF150023R", REGULATOR_SUPPLY("avdd", "i2c-OVTI5648:00"), NULL},
+ /* Surface Go 1&2 - OV5693, Front */
+ { "YHCU", REGULATOR_SUPPLY("avdd", "i2c-INT33BE:00"), NULL},
+};
+
+/*
+ * The regulators have to have .ops to be valid, but the only ops we actually
+ * support are .enable and .disable which are handled via .ena_gpiod. Pass an
+ * empty struct to clear the check without lying about capabilities.
+ */
+static const struct regulator_ops int3472_gpio_regulator_ops = { 0 };
+
+static int skl_int3472_clk_enable(struct clk_hw *hw)
+{
+ struct int3472_gpio_clock *clk = to_int3472_clk(hw);
+
+ gpiod_set_value(clk->gpio, 1);
+
+ return 0;
+}
+
+static void skl_int3472_clk_disable(struct clk_hw *hw)
+{
+ struct int3472_gpio_clock *clk = to_int3472_clk(hw);
+
+ gpiod_set_value(clk->gpio, 0);
+}
+
+static int skl_int3472_clk_prepare(struct clk_hw *hw)
+{
+ /*
+ * We're just turning a GPIO on to enable, so nothing to do here, but
+ * we want to provide the op so prepare_enable() works.
+ */
+ return 0;
+}
+
+static void skl_int3472_clk_unprepare(struct clk_hw *hw)
+{
+ /* Likewise, nothing to do here... */
+}
+
+static const struct clk_ops skl_int3472_clock_ops = {
+ .prepare = skl_int3472_clk_prepare,
+ .unprepare = skl_int3472_clk_unprepare,
+ .enable = skl_int3472_clk_enable,
+ .disable = skl_int3472_clk_disable,
+};
+
+static struct int3472_sensor_config *
+skl_int3472_get_sensor_module_config(struct int3472_device *int3472)
+{
+ unsigned int i = ARRAY_SIZE(int3472_sensor_configs);
+ struct int3472_sensor_config *ret;
+ union acpi_object *obj;
+
+ obj = acpi_evaluate_dsm_typed(int3472->sensor->handle,
+ &cio2_sensor_module_guid, 0x00,
+ 0x01, NULL, ACPI_TYPE_STRING);
+
+ if (!obj) {
+ dev_err(&int3472->pdev->dev,
+ "Failed to get sensor module string from _DSM\n");
+ return ERR_PTR(-ENODEV);
+ }
+
+ if (obj->string.type != ACPI_TYPE_STRING) {
+ dev_err(&int3472->pdev->dev,
+ "Sensor _DSM returned a non-string value\n");
+ ret = ERR_PTR(-EINVAL);
+ goto out_free_obj;
+ }
+
+ ret = ERR_PTR(-ENODEV);
+ while (i--) {
+ if (!strcmp(int3472_sensor_configs[i].sensor_module_name,
+ obj->string.pointer)) {
+ ret = &int3472_sensor_configs[i];
+ goto out_free_obj;
+ }
+ }
+
+out_free_obj:
+ ACPI_FREE(obj);
+ return ret;
+}
+
+static int skl_int3472_map_gpio_to_sensor(struct int3472_device *int3472,
+ struct acpi_resource *ares,
+ char *func, u32 polarity)
+{
+ char *path = ares->data.gpio.resource_source.string_ptr;
+ struct int3472_sensor_config *sensor_config;
+ struct gpiod_lookup table_entry;
+ struct acpi_device *adev;
+ acpi_handle handle;
+ acpi_status status;
+ int ret;
+
+ sensor_config = skl_int3472_get_sensor_module_config(int3472);
+ if (!IS_ERR(sensor_config) && sensor_config->function_maps) {
+ unsigned int i = 0;
+
+ while (sensor_config->function_maps[i].documented) {
+ if (!strcmp(func, sensor_config->function_maps[i].documented)) {
+ func = sensor_config->function_maps[i].actual;
+
+ break;
+ }
+
+ i++;
+ }
+ }
+
+ if (!func)
+ return 0;
+
+ if (int3472->n_sensor_gpios >= INT3472_MAX_SENSOR_GPIOS) {
+ dev_warn(&int3472->pdev->dev, "Too many GPIOs mapped\n");
+ return -EINVAL;
+ }
+
+ status = acpi_get_handle(NULL, path, &handle);
+ if (ACPI_FAILURE(status))
+ return -EINVAL;
+
+ ret = acpi_bus_get_device(handle, &adev);
+ if (ret)
+ return -ENODEV;
+
+ table_entry = (struct gpiod_lookup)GPIO_LOOKUP_IDX(acpi_dev_name(adev),
+ ares->data.gpio.pin_table[0],
+ func, 0, polarity);
+
+ memcpy(&int3472->gpios.table[int3472->n_sensor_gpios], &table_entry,
+ sizeof(table_entry));
+
+ int3472->n_sensor_gpios++;
+
+ return 0;
+}
+
+static int skl_int3472_register_clock(struct int3472_device *int3472,
+ struct acpi_resource *ares)
+{
+ char *path = ares->data.gpio.resource_source.string_ptr;
+ struct clk_init_data init = { };
+ int ret = 0;
+
+ init.name = kasprintf(GFP_KERNEL, "%s-clk",
+ acpi_dev_name(int3472->adev));
+ init.ops = &skl_int3472_clock_ops;
+
+ int3472->clock.gpio = acpi_get_gpiod(path,
+ ares->data.gpio.pin_table[0]);
+ if (IS_ERR(int3472->clock.gpio)) {
+ ret = PTR_ERR(int3472->clock.gpio);
+ goto out_free_init_name;
+ }
+
+ int3472->clock.clk_hw.init = &init;
+ int3472->clock.clk = clk_register(&int3472->adev->dev,
+ &int3472->clock.clk_hw);
+ if (IS_ERR(int3472->clock.clk)) {
+ ret = PTR_ERR(int3472->clock.clk);
+ goto err_put_gpio;
+ }
+
+ int3472->clock.cl = clkdev_create(int3472->clock.clk, "xvclk",
+ int3472->sensor_name);
+ if (IS_ERR_OR_NULL(int3472->clock.cl))
+ goto err_unregister_clk;
+
+ goto out_free_init_name;
+
+err_unregister_clk:
+ clk_unregister(int3472->clock.clk);
+err_put_gpio:
+ gpiod_put(int3472->clock.gpio);
+out_free_init_name:
+ kfree(init.name);
+
+ return ret;
+}
+
+static int skl_int3472_register_regulator(struct int3472_device *int3472,
+ struct acpi_resource *ares)
+{
+ char *path = ares->data.gpio.resource_source.string_ptr;
+ struct int3472_sensor_config *sensor_config;
+ struct regulator_init_data init_data = { };
+ struct regulator_config cfg = { };
+ int ret;
+
+ sensor_config = skl_int3472_get_sensor_module_config(int3472);
+ if (IS_ERR_OR_NULL(sensor_config)) {
+ dev_err(&int3472->pdev->dev, "No sensor module config\n");
+ return PTR_ERR(sensor_config);
+ }
+
+ if (!sensor_config->supply_map.supply) {
+ dev_err(&int3472->pdev->dev, "No supply name defined\n");
+ return -ENODEV;
+ }
+
+ init_data.supply_regulator = NULL;
+ init_data.constraints.valid_ops_mask = REGULATOR_CHANGE_STATUS;
+ init_data.num_consumer_supplies = 1;
+ init_data.consumer_supplies = &sensor_config->supply_map;
+
+ snprintf(int3472->regulator.regulator_name,
+ GPIO_REGULATOR_NAME_LENGTH, "int3472-discrete-regulator");
+ snprintf(int3472->regulator.supply_name,
+ GPIO_REGULATOR_SUPPLY_NAME_LENGTH, "supply-0");
+
+ int3472->regulator.rdesc = INT3472_REGULATOR(
+ int3472->regulator.regulator_name,
+ int3472->regulator.supply_name,
+ &int3472_gpio_regulator_ops);
+
+ int3472->regulator.gpio = acpi_get_gpiod(path,
+ ares->data.gpio.pin_table[0]);
+ if (IS_ERR(int3472->regulator.gpio)) {
+ dev_err(&int3472->pdev->dev, "Failed to get GPIO line\n");
+ return PTR_ERR(int3472->regulator.gpio);
+ }
+
+ cfg.dev = &int3472->adev->dev;
+ cfg.init_data = &init_data;
+ cfg.ena_gpiod = int3472->regulator.gpio;
+
+ int3472->regulator.rdev = regulator_register(&int3472->regulator.rdesc,
+ &cfg);
+ if (IS_ERR(int3472->regulator.rdev)) {
+ ret = PTR_ERR(int3472->regulator.rdev);
+ goto err_free_gpio;
+ }
+
+ return 0;
+
+err_free_gpio:
+ gpiod_put(int3472->regulator.gpio);
+
+ return ret;
+}
+
+/**
+ * skl_int3472_handle_gpio_resources: maps PMIC resources to consuming sensor
+ * @ares: A pointer to a &struct acpi_resource
+ * @data: A pointer to a &struct int3472_device
+ *
+ * This function handles GPIO resources that are against an INT3472
+ * ACPI device, by checking the value of the corresponding _DSM entry.
+ * This will return a 32bit int, where the lowest byte represents the
+ * function of the GPIO pin:
+ *
+ * 0x00 Reset
+ * 0x01 Power down
+ * 0x0b Power enable
+ * 0x0c Clock enable
+ * 0x0d Privacy LED
+ *
+ * There are some known platform specific quirks where that does not quite
+ * hold up; for example where a pin with type 0x01 (Power down) is mapped to
+ * a sensor pin that performs a reset function or entries in _CRS and _DSM that
+ * do not actually correspond to a physical connection. These will be handled by
+ * the mapping sub-functions.
+ *
+ * GPIOs will either be mapped directly to the sensor device or else used
+ * to create clocks and regulators via the usual frameworks.
+ *
+ * Return:
+ * * 0 - When all resources found are handled properly.
+ * * -EINVAL - If the resource is not a GPIO IO resource
+ * * -ENODEV - If the resource has no corresponding _DSM entry
+ * * -Other - Errors propagated from one of the sub-functions.
+ */
+static int skl_int3472_handle_gpio_resources(struct acpi_resource *ares,
+ void *data)
+{
+ struct int3472_device *int3472 = data;
+ union acpi_object *obj;
+ int ret = 0;
+
+ if (ares->type != ACPI_RESOURCE_TYPE_GPIO ||
+ ares->data.gpio.connection_type != ACPI_RESOURCE_GPIO_TYPE_IO)
+ return EINVAL; /* Deliberately positive so parsing continues */
+
+ /*
+ * n_gpios + 2 because the index of this _DSM function is 1-based and
+ * the first function is just a count.
+ */
+ obj = acpi_evaluate_dsm_typed(int3472->adev->handle,
+ &int3472_gpio_guid, 0x00,
+ int3472->n_gpios + 2,
+ NULL, ACPI_TYPE_INTEGER);
+
+ if (!obj) {
+ dev_warn(&int3472->pdev->dev,
+ "No _DSM entry for this GPIO pin\n");
+ return ENODEV;
+ }
+
+ switch (obj->integer.value & 0xff) {
+ case INT3472_GPIO_TYPE_RESET:
+ ret = skl_int3472_map_gpio_to_sensor(int3472, ares, "reset",
+ GPIO_ACTIVE_LOW);
+ if (ret)
+ dev_err(&int3472->pdev->dev,
+ "Failed to map reset pin to sensor\n");
+
+ break;
+ case INT3472_GPIO_TYPE_POWERDOWN:
+ ret = skl_int3472_map_gpio_to_sensor(int3472, ares, "powerdown",
+ GPIO_ACTIVE_LOW);
+ if (ret)
+ dev_err(&int3472->pdev->dev,
+ "Failed to map powerdown pin to sensor\n");
+
+ break;
+ case INT3472_GPIO_TYPE_CLK_ENABLE:
+ ret = skl_int3472_register_clock(int3472, ares);
+ if (ret)
+ dev_err(&int3472->pdev->dev,
+ "Failed to map clock to sensor\n");
+
+ break;
+ case INT3472_GPIO_TYPE_POWER_ENABLE:
+ ret = skl_int3472_register_regulator(int3472, ares);
+ if (ret) {
+ dev_err(&int3472->pdev->dev,
+ "Failed to map regulator to sensor\n");
+ }
+
+ break;
+ case INT3472_GPIO_TYPE_PRIVACY_LED:
+ ret = skl_int3472_map_gpio_to_sensor(int3472, ares,
+ "indicator-led",
+ GPIO_ACTIVE_HIGH);
+ if (ret)
+ dev_err(&int3472->pdev->dev,
+ "Failed to map indicator led to sensor\n");
+
+ break;
+ default:
+ dev_warn(&int3472->pdev->dev,
+ "GPIO type 0x%llx unknown; the sensor may not work\n",
+ (obj->integer.value & 0xff));
+ ret = EINVAL;
+ }
+
+ int3472->n_gpios++;
+ ACPI_FREE(obj);
+
+ return ret;
+}
+
+static int skl_int3472_parse_crs(struct int3472_device *int3472)
+{
+ struct list_head resource_list;
+ int ret = 0;
+
+ INIT_LIST_HEAD(&resource_list);
+
+ ret = acpi_dev_get_resources(int3472->adev, &resource_list,
+ skl_int3472_handle_gpio_resources,
+ int3472);
+
+ if (!ret) {
+ gpiod_add_lookup_table(&int3472->gpios);
+ int3472->gpios_mapped = true;
+ }
+
+ acpi_dev_free_resource_list(&resource_list);
+
+ return ret;
+}
+
+int skl_int3472_discrete_probe(struct platform_device *pdev)
+{
+ struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
+ struct int3472_device *int3472;
+ struct int3472_cldb cldb;
+ int ret = 0;
+
+ ret = skl_int3472_get_cldb_buffer(adev, &cldb);
+ if (ret || cldb.control_logic_type != 1)
+ return -EINVAL;
+
+ int3472 = kzalloc(sizeof(*int3472) +
+ ((INT3472_MAX_SENSOR_GPIOS + 1) * sizeof(struct gpiod_lookup)),
+ GFP_KERNEL);
+ if (!int3472)
+ return -ENOMEM;
+
+ int3472->adev = adev;
+ int3472->pdev = pdev;
+ platform_set_drvdata(pdev, int3472);
+
+ int3472->sensor = acpi_dev_get_next_dep_dev(adev, NULL);
+ if (!int3472->sensor) {
+ dev_err(&pdev->dev,
+ "This INT3472 entry seems to have no dependents.\n");
+ ret = -ENODEV;
+ goto err_free_int3472;
+ }
+ int3472->sensor_name = i2c_acpi_dev_name(int3472->sensor);
+ int3472->gpios.dev_id = int3472->sensor_name;
+
+ ret = skl_int3472_parse_crs(int3472);
+ if (ret) {
+ skl_int3472_discrete_remove(pdev);
+ goto err_return_ret;
+ }
+
+ return 0;
+
+err_free_int3472:
+ kfree(int3472);
+err_return_ret:
+ return ret;
+}
+
+int skl_int3472_discrete_remove(struct platform_device *pdev)
+{
+ struct int3472_device *int3472;
+
+ int3472 = platform_get_drvdata(pdev);
+
+ if (int3472->gpios_mapped)
+ gpiod_remove_lookup_table(&int3472->gpios);
+
+ if (!IS_ERR_OR_NULL(int3472->regulator.rdev)) {
+ gpiod_put(int3472->regulator.gpio);
+ regulator_unregister(int3472->regulator.rdev);
+ }
+
+ if (!IS_ERR_OR_NULL(int3472->clock.clk)) {
+ gpiod_put(int3472->clock.gpio);
+ clk_unregister(int3472->clock.clk);
+ clkdev_drop(int3472->clock.cl);
+ }
+
+ acpi_dev_put(int3472->sensor);
+
+ kfree(int3472->sensor_name);
+ kfree(int3472);
+
+ return 0;
+}
diff --git a/drivers/platform/x86/intel_skl_int3472_tps68470.c b/drivers/platform/x86/intel_skl_int3472_tps68470.c
new file mode 100644
index 000000000000..9bda65d34987
--- /dev/null
+++ b/drivers/platform/x86/intel_skl_int3472_tps68470.c
@@ -0,0 +1,145 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Author: Dan Scally <djrscally@...il.com> */
+
+#include <linux/i2c.h>
+#include <linux/mfd/tps68470.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include "intel_skl_int3472_common.h"
+
+static const struct regmap_config tps68470_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = TPS68470_REG_MAX,
+};
+
+static int tps68470_chip_init(struct device *dev, struct regmap *regmap)
+{
+ unsigned int version;
+ int ret;
+
+ /* Force software reset */
+ ret = regmap_write(regmap, TPS68470_REG_RESET, TPS68470_REG_RESET_MASK);
+ if (ret)
+ return ret;
+
+ ret = regmap_read(regmap, TPS68470_REG_REVID, &version);
+ if (ret) {
+ dev_err(dev, "Failed to read revision register: %d\n", ret);
+ return ret;
+ }
+
+ dev_info(dev, "TPS68470 REVID: 0x%x\n", version);
+
+ return 0;
+}
+
+static struct platform_device *
+skl_int3472_register_pdev(const char *name, struct device *parent)
+{
+ struct platform_device *pdev;
+ int ret;
+
+ pdev = platform_device_alloc(name, PLATFORM_DEVID_NONE);
+ if (IS_ERR_OR_NULL(pdev))
+ return ERR_PTR(-ENOMEM);
+
+ pdev->dev.parent = parent;
+ pdev->driver_override = kstrndup(pdev->name, INT3472_PDEV_MAX_NAME_LEN,
+ GFP_KERNEL);
+
+ ret = platform_device_add(pdev);
+ if (ret) {
+ platform_device_put(pdev);
+ return ERR_PTR(ret);
+ }
+
+ return pdev;
+}
+
+int skl_int3472_tps68470_probe(struct i2c_client *client)
+{
+ struct acpi_device *adev = ACPI_COMPANION(&client->dev);
+ struct platform_device *regulator_dev;
+ struct platform_device *opregion_dev;
+ struct platform_device *gpio_dev;
+ struct int3472_cldb cldb = { 0 };
+ struct platform_device *clk_dev;
+ bool cldb_present = true;
+ struct regmap *regmap;
+ int ret = 0;
+
+ regmap = devm_regmap_init_i2c(client, &tps68470_regmap_config);
+ if (IS_ERR(regmap)) {
+ dev_err(&client->dev, "devm_regmap_init_i2c Error %ld\n",
+ PTR_ERR(regmap));
+ return PTR_ERR(regmap);
+ }
+
+ i2c_set_clientdata(client, regmap);
+
+ ret = tps68470_chip_init(&client->dev, regmap);
+ if (ret < 0) {
+ dev_err(&client->dev, "TPS68470 Init Error %d\n", ret);
+ return ret;
+ }
+
+ /*
+ * Check CLDB buffer against the PMIC's adev. If present, then we check
+ * the value of control_logic_type field and follow one of the
+ * following scenarios:
+ *
+ * 1. No CLDB - likely ACPI tables designed for ChromeOS. We
+ * create platform devices for the GPIOs and OpRegion drivers.
+ *
+ * 2. CLDB, with control_logic_type = 2 - probably ACPI tables
+ * made for Windows 2-in-1 platforms. Register pdevs for GPIO,
+ * Clock and Regulator drivers to bind to.
+ *
+ * 3. Any other value in control_logic_type, we should never have
+ * gotten to this point; crash and burn.
+ */
+ ret = skl_int3472_get_cldb_buffer(adev, &cldb);
+ if (!ret && cldb.control_logic_type != 2)
+ return -EINVAL;
+
+ if (ret)
+ cldb_present = false;
+
+ gpio_dev = skl_int3472_register_pdev("tps68470-gpio", &client->dev);
+ if (IS_ERR(gpio_dev))
+ return PTR_ERR(gpio_dev);
+
+ if (cldb_present) {
+ clk_dev = skl_int3472_register_pdev("tps68470-clk",
+ &client->dev);
+ if (IS_ERR(clk_dev)) {
+ ret = PTR_ERR(clk_dev);
+ goto err_free_gpio;
+ }
+
+ regulator_dev = skl_int3472_register_pdev("tps68470-regulator",
+ &client->dev);
+ if (IS_ERR(regulator_dev)) {
+ ret = PTR_ERR(regulator_dev);
+ goto err_free_clk;
+ }
+ } else {
+ opregion_dev = skl_int3472_register_pdev("tps68470_pmic_opregion",
+ &client->dev);
+ if (IS_ERR(opregion_dev)) {
+ ret = PTR_ERR(opregion_dev);
+ goto err_free_gpio;
+ }
+ }
+
+ return 0;
+
+err_free_clk:
+ platform_device_put(clk_dev);
+err_free_gpio:
+ platform_device_put(gpio_dev);
+
+ return ret;
+}
--
2.25.1
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