13 files changed, 195 insertions, 29 deletions

diff --git a/drivers/platform/chrome/Kconfig b/drivers/platform/chrome/Kconfig
index 6b954c5acadb..c1ca247987d2 100644
--- a/drivers/platform/chrome/Kconfig
+++ b/drivers/platform/chrome/Kconfig
@@ -228,6 +228,16 @@ config CROS_EC_TYPEC
 	  To compile this driver as a module, choose M here: the module will be
 	  called cros_ec_typec.
 
+config CROS_HPS_I2C
+	tristate "ChromeOS HPS device"
+	depends on HID && I2C && PM
+	help
+	  Say Y here if you want to enable support for the ChromeOS
+	  human presence sensor (HPS), attached via I2C. The driver supports a
+	  sensor connected to the I2C bus and exposes it as a character device.
+	  To save power, the sensor is automatically powered down when no
+	  clients are accessing it.
+
 config CROS_USBPD_LOGGER
 	tristate "Logging driver for USB PD charger"
 	depends on CHARGER_CROS_USBPD
diff --git a/drivers/platform/chrome/Makefile b/drivers/platform/chrome/Makefile
index 2950610101f1..f6068d077a40 100644
--- a/drivers/platform/chrome/Makefile
+++ b/drivers/platform/chrome/Makefile
@@ -27,6 +27,7 @@ obj-$(CONFIG_CROS_EC_DEBUGFS)		+= cros_ec_debugfs.o
 cros-ec-sensorhub-objs			:= cros_ec_sensorhub.o cros_ec_sensorhub_ring.o
 obj-$(CONFIG_CROS_EC_SENSORHUB)		+= cros-ec-sensorhub.o
 obj-$(CONFIG_CROS_EC_SYSFS)		+= cros_ec_sysfs.o
+obj-$(CONFIG_CROS_HPS_I2C)		+= cros_hps_i2c.o
 obj-$(CONFIG_CROS_USBPD_LOGGER)		+= cros_usbpd_logger.o
 obj-$(CONFIG_CROS_USBPD_NOTIFY)		+= cros_usbpd_notify.o
 
diff --git a/drivers/platform/chrome/cros_ec_debugfs.c b/drivers/platform/chrome/cros_ec_debugfs.c
index 4e63adf083ea..21d973fc6be2 100644
--- a/drivers/platform/chrome/cros_ec_debugfs.c
+++ b/drivers/platform/chrome/cros_ec_debugfs.c
@@ -521,6 +521,7 @@ static struct platform_driver cros_ec_debugfs_driver = {
 	.driver = {
 		.name = DRV_NAME,
 		.pm = &cros_ec_debugfs_pm_ops,
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
 	},
 	.probe = cros_ec_debugfs_probe,
 	.remove = cros_ec_debugfs_remove,
diff --git a/drivers/platform/chrome/cros_ec_i2c.c b/drivers/platform/chrome/cros_ec_i2c.c
index b6823c654c3f..dbe698f33128 100644
--- a/drivers/platform/chrome/cros_ec_i2c.c
+++ b/drivers/platform/chrome/cros_ec_i2c.c
@@ -286,8 +286,7 @@ done:
 	return ret;
 }
 
-static int cros_ec_i2c_probe(struct i2c_client *client,
-			     const struct i2c_device_id *dev_id)
+static int cros_ec_i2c_probe(struct i2c_client *client)
 {
 	struct device *dev = &client->dev;
 	struct cros_ec_device *ec_dev = NULL;
@@ -373,7 +372,7 @@ static struct i2c_driver cros_ec_driver = {
 		.of_match_table = of_match_ptr(cros_ec_i2c_of_match),
 		.pm	= &cros_ec_i2c_pm_ops,
 	},
-	.probe		= cros_ec_i2c_probe,
+	.probe_new	= cros_ec_i2c_probe,
 	.remove		= cros_ec_i2c_remove,
 	.id_table	= cros_ec_i2c_id,
 };
diff --git a/drivers/platform/chrome/cros_ec_lightbar.c b/drivers/platform/chrome/cros_ec_lightbar.c
index 469dfc7a4a03..1674105decfb 100644
--- a/drivers/platform/chrome/cros_ec_lightbar.c
+++ b/drivers/platform/chrome/cros_ec_lightbar.c
@@ -8,6 +8,7 @@
 #include <linux/device.h>
 #include <linux/fs.h>
 #include <linux/kobject.h>
+#include <linux/kstrtox.h>
 #include <linux/module.h>
 #include <linux/platform_data/cros_ec_commands.h>
 #include <linux/platform_data/cros_ec_proto.h>
@@ -493,7 +494,7 @@ static ssize_t userspace_control_store(struct device *dev,
 	bool enable;
 	int ret;
 
-	ret = strtobool(buf, &enable);
+	ret = kstrtobool(buf, &enable);
 	if (ret < 0)
 		return ret;
 
@@ -601,6 +602,7 @@ static struct platform_driver cros_ec_lightbar_driver = {
 	.driver = {
 		.name = DRV_NAME,
 		.pm = &cros_ec_lightbar_pm_ops,
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
 	},
 	.probe = cros_ec_lightbar_probe,
 	.remove = cros_ec_lightbar_remove,
diff --git a/drivers/platform/chrome/cros_ec_lpc.c b/drivers/platform/chrome/cros_ec_lpc.c
index 7677ab3c0ead..7fc8f82280ac 100644
--- a/drivers/platform/chrome/cros_ec_lpc.c
+++ b/drivers/platform/chrome/cros_ec_lpc.c
@@ -354,6 +354,9 @@ static int cros_ec_lpc_probe(struct platform_device *pdev)
 		return -EBUSY;
 	}
 
+	cros_ec_lpc_mec_init(EC_HOST_CMD_REGION0,
+			     EC_LPC_ADDR_MEMMAP + EC_MEMMAP_SIZE);
+
 	/*
 	 * Read the mapped ID twice, the first one is assuming the
 	 * EC is a Microchip Embedded Controller (MEC) variant, if the
@@ -554,6 +557,12 @@ static struct platform_driver cros_ec_lpc_driver = {
 		.name = DRV_NAME,
 		.acpi_match_table = cros_ec_lpc_acpi_device_ids,
 		.pm = &cros_ec_lpc_pm_ops,
+		/*
+		 * ACPI child devices may probe before us, and they racily
+		 * check our drvdata pointer. Force synchronous probe until
+		 * those races are resolved.
+		 */
+		.probe_type = PROBE_FORCE_SYNCHRONOUS,
 	},
 	.probe = cros_ec_lpc_probe,
 	.remove = cros_ec_lpc_remove,
@@ -586,14 +595,10 @@ static int __init cros_ec_lpc_init(void)
 		return -ENODEV;
 	}
 
-	cros_ec_lpc_mec_init(EC_HOST_CMD_REGION0,
-			     EC_LPC_ADDR_MEMMAP + EC_MEMMAP_SIZE);
-
 	/* Register the driver */
 	ret = platform_driver_register(&cros_ec_lpc_driver);
 	if (ret) {
 		pr_err(DRV_NAME ": can't register driver: %d\n", ret);
-		cros_ec_lpc_mec_destroy();
 		return ret;
 	}
 
@@ -603,7 +608,6 @@ static int __init cros_ec_lpc_init(void)
 		if (ret) {
 			pr_err(DRV_NAME ": can't register device: %d\n", ret);
 			platform_driver_unregister(&cros_ec_lpc_driver);
-			cros_ec_lpc_mec_destroy();
 		}
 	}
 
@@ -615,7 +619,6 @@ static void __exit cros_ec_lpc_exit(void)
 	if (!cros_ec_lpc_acpi_device_found)
 		platform_device_unregister(&cros_ec_lpc_device);
 	platform_driver_unregister(&cros_ec_lpc_driver);
-	cros_ec_lpc_mec_destroy();
 }
 
 module_init(cros_ec_lpc_init);
diff --git a/drivers/platform/chrome/cros_ec_lpc_mec.c b/drivers/platform/chrome/cros_ec_lpc_mec.c
index bbc2884f5e2f..0d9c79b270ce 100644
--- a/drivers/platform/chrome/cros_ec_lpc_mec.c
+++ b/drivers/platform/chrome/cros_ec_lpc_mec.c
@@ -146,9 +146,3 @@ void cros_ec_lpc_mec_init(unsigned int base, unsigned int end)
 	mec_emi_end = end;
 }
 EXPORT_SYMBOL(cros_ec_lpc_mec_init);
-
-void cros_ec_lpc_mec_destroy(void)
-{
-	mutex_destroy(&io_mutex);
-}
-EXPORT_SYMBOL(cros_ec_lpc_mec_destroy);
diff --git a/drivers/platform/chrome/cros_ec_lpc_mec.h b/drivers/platform/chrome/cros_ec_lpc_mec.h
index aa1018f6b0f2..9d0521b23e8a 100644
--- a/drivers/platform/chrome/cros_ec_lpc_mec.h
+++ b/drivers/platform/chrome/cros_ec_lpc_mec.h
@@ -45,13 +45,6 @@ enum cros_ec_lpc_mec_io_type {
  */
 void cros_ec_lpc_mec_init(unsigned int base, unsigned int end);
 
-/*
- * cros_ec_lpc_mec_destroy
- *
- * Cleanup MEC I/O.
- */
-void cros_ec_lpc_mec_destroy(void);
-
 /**
  * cros_ec_lpc_mec_in_range() - Determine if addresses are in MEC EMI range.
  *
diff --git a/drivers/platform/chrome/cros_ec_spi.c b/drivers/platform/chrome/cros_ec_spi.c
index 7360b3ff6e4f..21143dba8970 100644
--- a/drivers/platform/chrome/cros_ec_spi.c
+++ b/drivers/platform/chrome/cros_ec_spi.c
@@ -834,6 +834,7 @@ static struct spi_driver cros_ec_driver_spi = {
 		.name	= "cros-ec-spi",
 		.of_match_table = cros_ec_spi_of_match,
 		.pm	= &cros_ec_spi_pm_ops,
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
 	},
 	.probe		= cros_ec_spi_probe,
 	.remove		= cros_ec_spi_remove,
diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index 2a7ff14dc37e..59de4ce01fab 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -173,10 +173,13 @@ static int cros_typec_get_switch_handles(struct cros_typec_port *port,
 
 role_sw_err:
 	typec_switch_put(port->ori_sw);
+	port->ori_sw = NULL;
 ori_sw_err:
 	typec_retimer_put(port->retimer);
+	port->retimer = NULL;
 retimer_sw_err:
 	typec_mux_put(port->mux);
+	port->mux = NULL;
 mux_err:
 	return -ENODEV;
 }
diff --git a/drivers/platform/chrome/cros_hps_i2c.c b/drivers/platform/chrome/cros_hps_i2c.c
new file mode 100644
index 000000000000..62ccb1acb5de
--- /dev/null
+++ b/drivers/platform/chrome/cros_hps_i2c.c
@@ -0,0 +1,160 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for the ChromeOS human presence sensor (HPS), attached via I2C.
+ *
+ * The driver exposes HPS as a character device, although currently no read or
+ * write operations are supported. Instead, the driver only controls the power
+ * state of the sensor, keeping it on only while userspace holds an open file
+ * descriptor to the HPS device.
+ *
+ * Copyright 2022 Google LLC.
+ */
+
+#include <linux/acpi.h>
+#include <linux/fs.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+
+#define HPS_ACPI_ID		"GOOG0020"
+
+struct hps_drvdata {
+	struct i2c_client *client;
+	struct miscdevice misc_device;
+	struct gpio_desc *enable_gpio;
+};
+
+static void hps_set_power(struct hps_drvdata *hps, bool state)
+{
+	gpiod_set_value_cansleep(hps->enable_gpio, state);
+}
+
+static int hps_open(struct inode *inode, struct file *file)
+{
+	struct hps_drvdata *hps = container_of(file->private_data,
+					       struct hps_drvdata, misc_device);
+	struct device *dev = &hps->client->dev;
+
+	return pm_runtime_resume_and_get(dev);
+}
+
+static int hps_release(struct inode *inode, struct file *file)
+{
+	struct hps_drvdata *hps = container_of(file->private_data,
+					       struct hps_drvdata, misc_device);
+	struct device *dev = &hps->client->dev;
+
+	return pm_runtime_put(dev);
+}
+
+static const struct file_operations hps_fops = {
+	.owner = THIS_MODULE,
+	.open = hps_open,
+	.release = hps_release,
+};
+
+static int hps_i2c_probe(struct i2c_client *client)
+{
+	struct hps_drvdata *hps;
+	int ret;
+
+	hps = devm_kzalloc(&client->dev, sizeof(*hps), GFP_KERNEL);
+	if (!hps)
+		return -ENOMEM;
+
+	hps->misc_device.parent = &client->dev;
+	hps->misc_device.minor = MISC_DYNAMIC_MINOR;
+	hps->misc_device.name = "cros-hps";
+	hps->misc_device.fops = &hps_fops;
+
+	i2c_set_clientdata(client, hps);
+	hps->client = client;
+
+	/*
+	 * HPS is powered on from firmware before entering the kernel, so we
+	 * acquire the line with GPIOD_OUT_HIGH here to preserve the existing
+	 * state. The peripheral is powered off after successful probe below.
+	 */
+	hps->enable_gpio = devm_gpiod_get(&client->dev, "enable", GPIOD_OUT_HIGH);
+	if (IS_ERR(hps->enable_gpio)) {
+		ret = PTR_ERR(hps->enable_gpio);
+		dev_err(&client->dev, "failed to get enable gpio: %d\n", ret);
+		return ret;
+	}
+
+	ret = misc_register(&hps->misc_device);
+	if (ret) {
+		dev_err(&client->dev, "failed to initialize misc device: %d\n", ret);
+		return ret;
+	}
+
+	hps_set_power(hps, false);
+	pm_runtime_enable(&client->dev);
+	return 0;
+}
+
+static void hps_i2c_remove(struct i2c_client *client)
+{
+	struct hps_drvdata *hps = i2c_get_clientdata(client);
+
+	pm_runtime_disable(&client->dev);
+	misc_deregister(&hps->misc_device);
+
+	/*
+	 * Re-enable HPS, in order to return it to its default state
+	 * (i.e. powered on).
+	 */
+	hps_set_power(hps, true);
+}
+
+static int hps_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct hps_drvdata *hps = i2c_get_clientdata(client);
+
+	hps_set_power(hps, false);
+	return 0;
+}
+
+static int hps_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct hps_drvdata *hps = i2c_get_clientdata(client);
+
+	hps_set_power(hps, true);
+	return 0;
+}
+static UNIVERSAL_DEV_PM_OPS(hps_pm_ops, hps_suspend, hps_resume, NULL);
+
+static const struct i2c_device_id hps_i2c_id[] = {
+	{ "cros-hps", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, hps_i2c_id);
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id hps_acpi_id[] = {
+	{ HPS_ACPI_ID, 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, hps_acpi_id);
+#endif /* CONFIG_ACPI */
+
+static struct i2c_driver hps_i2c_driver = {
+	.probe_new = hps_i2c_probe,
+	.remove = hps_i2c_remove,
+	.id_table = hps_i2c_id,
+	.driver = {
+		.name = "cros-hps",
+		.pm = &hps_pm_ops,
+		.acpi_match_table = ACPI_PTR(hps_acpi_id),
+	},
+};
+module_i2c_driver(hps_i2c_driver);
+
+MODULE_ALIAS("acpi:" HPS_ACPI_ID);
+MODULE_AUTHOR("Sami Kyöstilä <skyostil@chromium.org>");
+MODULE_DESCRIPTION("Driver for ChromeOS HPS");
+MODULE_LICENSE("GPL");
diff --git a/drivers/platform/chrome/cros_usbpd_notify.c b/drivers/platform/chrome/cros_usbpd_notify.c
index 4b5a81c9dc6d..10670b6588e3 100644
--- a/drivers/platform/chrome/cros_usbpd_notify.c
+++ b/drivers/platform/chrome/cros_usbpd_notify.c
@@ -239,7 +239,11 @@ static int __init cros_usbpd_notify_init(void)
 		return ret;
 
 #ifdef CONFIG_ACPI
-	platform_driver_register(&cros_usbpd_notify_acpi_driver);
+	ret = platform_driver_register(&cros_usbpd_notify_acpi_driver);
+	if (ret) {
+		platform_driver_unregister(&cros_usbpd_notify_plat_driver);
+		return ret;
+	}
 #endif
 	return 0;
 }
diff --git a/drivers/platform/chrome/wilco_ec/core.c b/drivers/platform/chrome/wilco_ec/core.c
index 5b42992bff38..d6a994bdc182 100644
--- a/drivers/platform/chrome/wilco_ec/core.c
+++ b/drivers/platform/chrome/wilco_ec/core.c
@@ -129,7 +129,6 @@ unregister_rtc:
 unregister_debugfs:
 	if (ec->debugfs_pdev)
 		platform_device_unregister(ec->debugfs_pdev);
-	cros_ec_lpc_mec_destroy();
 	return ret;
 }
 
@@ -143,10 +142,6 @@ static int wilco_ec_remove(struct platform_device *pdev)
 	platform_device_unregister(ec->rtc_pdev);
 	if (ec->debugfs_pdev)
 		platform_device_unregister(ec->debugfs_pdev);
-
-	/* Teardown cros_ec interface */
-	cros_ec_lpc_mec_destroy();
-
 	return 0;
 }