platform/chrome: Centralize cros_ec_device allocation

Introduce a helper function, cros_ec_device_alloc(), to centralize the
allocation of the struct cros_ec_device.  Convert all protocol device
drivers to use this new function.

This is a preparatory step for separating common initialization logic
out of device drivers' probe() and cros_ec_register().

Link: https://lore.kernel.org/r/20250828083601.856083-2-tzungbi@kernel.org
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>

Author: Tzung-Bi Shih

drivers/platform/chrome/cros_ec.c

@@ -30,6 +30,18 @@ static struct cros_ec_platform pd_p = {
 	.cmd_offset = EC_CMD_PASSTHRU_OFFSET(CROS_EC_DEV_PD_INDEX),
 };
 
+struct cros_ec_device *cros_ec_device_alloc(struct device *dev)
+{
+	struct cros_ec_device *ec_dev;
+
+	ec_dev = devm_kzalloc(dev, sizeof(*ec_dev), GFP_KERNEL);
+	if (!ec_dev)
+		return NULL;
+
+	return ec_dev;
+}
+EXPORT_SYMBOL(cros_ec_device_alloc);
+
 /**
  * cros_ec_irq_handler() - top half part of the interrupt handler
  * @irq: IRQ id

drivers/platform/chrome/cros_ec.h

@@ -11,6 +11,9 @@
 #include <linux/interrupt.h>
 
 struct cros_ec_device;
+struct device;
+
+struct cros_ec_device *cros_ec_device_alloc(struct device *dev);
 
 int cros_ec_register(struct cros_ec_device *ec_dev);
 void cros_ec_unregister(struct cros_ec_device *ec_dev);

drivers/platform/chrome/cros_ec_i2c.c

@@ -289,10 +289,10 @@ static int cros_ec_cmd_xfer_i2c(struct cros_ec_device *ec_dev,
 static int cros_ec_i2c_probe(struct i2c_client *client)
 {
 	struct device *dev = &client->dev;
-	struct cros_ec_device *ec_dev = NULL;
+	struct cros_ec_device *ec_dev;
 	int err;
 
-	ec_dev = devm_kzalloc(dev, sizeof(*ec_dev), GFP_KERNEL);
+	ec_dev = cros_ec_device_alloc(dev);
 	if (!ec_dev)
 		return -ENOMEM;
 

drivers/platform/chrome/cros_ec_ishtp.c

@@ -543,7 +543,7 @@ static int cros_ec_dev_init(struct ishtp_cl_data *client_data)
 	struct cros_ec_device *ec_dev;
 	struct device *dev = cl_data_to_dev(client_data);
 
-	ec_dev = devm_kzalloc(dev, sizeof(*ec_dev), GFP_KERNEL);
+	ec_dev = cros_ec_device_alloc(dev);
 	if (!ec_dev)
 		return -ENOMEM;
 

drivers/platform/chrome/cros_ec_lpc.c

@@ -637,7 +637,7 @@ static int cros_ec_lpc_probe(struct platform_device *pdev)
 		}
 	}
 
-	ec_dev = devm_kzalloc(dev, sizeof(*ec_dev), GFP_KERNEL);
+	ec_dev = cros_ec_device_alloc(dev);
 	if (!ec_dev)
 		return -ENOMEM;
 

drivers/platform/chrome/cros_ec_rpmsg.c

@@ -216,7 +216,7 @@ static int cros_ec_rpmsg_probe(struct rpmsg_device *rpdev)
 	struct cros_ec_device *ec_dev;
 	int ret;
 
-	ec_dev = devm_kzalloc(dev, sizeof(*ec_dev), GFP_KERNEL);
+	ec_dev = cros_ec_device_alloc(dev);
 	if (!ec_dev)
 		return -ENOMEM;
 

drivers/platform/chrome/cros_ec_spi.c

@@ -749,7 +749,7 @@ static int cros_ec_spi_probe(struct spi_device *spi)
 	if (ec_spi == NULL)
 		return -ENOMEM;
 	ec_spi->spi = spi;
-	ec_dev = devm_kzalloc(dev, sizeof(*ec_dev), GFP_KERNEL);
+	ec_dev = cros_ec_device_alloc(dev);
 	if (!ec_dev)
 		return -ENOMEM;
 

drivers/platform/chrome/cros_ec_uart.c

@@ -259,7 +259,7 @@ static int cros_ec_uart_probe(struct serdev_device *serdev)
 	if (!ec_uart)
 		return -ENOMEM;
 
-	ec_dev = devm_kzalloc(dev, sizeof(*ec_dev), GFP_KERNEL);
+	ec_dev = cros_ec_device_alloc(dev);
 	if (!ec_dev)
 		return -ENOMEM;