[PATCH v8 3/3] HID: cp2112: Fwnode Support

From: Danny Kaehn <kaehndan@gmail.com>
To: robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org,
	jikos@kernel.org, benjamin.tissoires@redhat.com
Cc: bartosz.golaszewski@linaro.org,
	andriy.shevchenko@linux.intel.com, dmitry.torokhov@gmail.com,
	devicetree@vger.kernel.org, linux-input@vger.kernel.org,
	ethan.twardy@plexus.com
Subject: [PATCH v8 3/3] HID: cp2112: Fwnode Support
Date: Mon, 27 Feb 2023 08:07:58 -0600	[thread overview]
Message-ID: <20230227140758.1575-4-kaehndan@gmail.com> (raw)
In-Reply-To: <20230227140758.1575-1-kaehndan@gmail.com>

Bind I2C and GPIO interfaces to subnodes with names
"i2c" and "gpio" if they exist, respectively. This
allows the GPIO and I2C controllers to be described
in firmware as usual. Additionally, support configuring the
I2C bus speed from the clock-frequency device property.

Signed-off-by: Danny Kaehn <kaehndan@gmail.com>
---
 drivers/hid/hid-cp2112.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/hid/hid-cp2112.c b/drivers/hid/hid-cp2112.c
index 27cadadda7c9..491e3c83af12 100644
--- a/drivers/hid/hid-cp2112.c
+++ b/drivers/hid/hid-cp2112.c
@@ -1234,6 +1234,7 @@ static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id)
 	u8 buf[3];
 	struct cp2112_smbus_config_report config;
 	struct gpio_irq_chip *girq;
+	struct i2c_timings timings;
 	int ret;
 
 	dev = devm_kzalloc(&hdev->dev, sizeof(*dev), GFP_KERNEL);
@@ -1292,6 +1293,10 @@ static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id)
 		goto err_power_normal;
 	}
 
+	device_set_node(&dev->adap.dev, device_get_named_child_node(&hdev->dev, "i2c"));
+	i2c_parse_fw_timings(&dev->adap.dev, &timings, true);
+
+	config.clock_speed = cpu_to_be32(timings.bus_freq_hz);
 	config.retry_time = cpu_to_be16(1);
 
 	ret = cp2112_hid_output(hdev, (u8 *)&config, sizeof(config),
@@ -1300,7 +1305,7 @@ static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id)
 		hid_err(hdev, "error setting SMBus config\n");
 		if (ret >= 0)
 			ret = -EIO;
-		goto err_power_normal;
+		goto err_free_i2c_of;
 	}
 
 	hid_set_drvdata(hdev, (void *)dev);
@@ -1322,7 +1327,7 @@ static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id)
 
 	if (ret) {
 		hid_err(hdev, "error registering i2c adapter\n");
-		goto err_power_normal;
+		goto err_free_i2c_of;
 	}
 
 	hid_dbg(hdev, "adapter registered\n");
@@ -1336,6 +1341,7 @@ static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id)
 	dev->gc.ngpio			= 8;
 	dev->gc.can_sleep		= 1;
 	dev->gc.parent			= &hdev->dev;
+	dev->gc.fwnode			= device_get_named_child_node(&hdev->dev, "gpio");
 
 	dev->irq.name = "cp2112-gpio";
 	dev->irq.irq_startup = cp2112_gpio_irq_startup;
@@ -1376,7 +1382,10 @@ static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id)
 err_gpiochip_remove:
 	gpiochip_remove(&dev->gc);
 err_free_i2c:
+	fwnode_handle_put(dev->gc.fwnode);
 	i2c_del_adapter(&dev->adap);
+err_free_i2c_of:
+	fwnode_handle_put(dev_fwnode(&dev->adap.dev));
 err_power_normal:
 	hid_hw_power(hdev, PM_HINT_NORMAL);
 err_hid_close:
@@ -1391,6 +1400,8 @@ static void cp2112_remove(struct hid_device *hdev)
 	struct cp2112_device *dev = hid_get_drvdata(hdev);
 	int i;
 
+	fwnode_handle_put(dev->gc.fwnode);
+	fwnode_handle_put(dev_fwnode(&dev->adap.dev));
 	sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group);
 	i2c_del_adapter(&dev->adap);
 
-- 
2.25.1

