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Date: Fri, 9 Dec 2022 15:07:30 +0100
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Andy Gross <agross@...nel.org>,
Bjorn Andersson <andersson@...nel.org>,
Konrad Dybcio <konrad.dybcio@...ainline.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jiri Slaby <jirislaby@...nel.org>,
Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
Vinod Koul <vkoul@...nel.org>, Alex Elder <elder@...nel.org>,
Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
linux-serial@...r.kernel.org,
Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH 1/2] tty: serial: provide devm_uart_add_one_port()
From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Provide a devres variant of uart_add_one_port() that removes the managed
port at device detach.
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
.../driver-api/driver-model/devres.rst | 3 ++
drivers/tty/serial/serial_core.c | 48 +++++++++++++++++++
include/linux/serial_core.h | 6 +++
3 files changed, 57 insertions(+)
diff --git a/Documentation/driver-api/driver-model/devres.rst b/Documentation/driver-api/driver-model/devres.rst
index 56082265e8e5..5d07a8c1eadb 100644
--- a/Documentation/driver-api/driver-model/devres.rst
+++ b/Documentation/driver-api/driver-model/devres.rst
@@ -436,6 +436,9 @@ RTC
SERDEV
devm_serdev_device_open()
+SERIAL
+ devm_uart_add_one_port()
+
SLAVE DMA ENGINE
devm_acpi_dma_controller_register()
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 179ee199df34..44cdb8aa80a4 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -3217,6 +3217,54 @@ int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport)
}
EXPORT_SYMBOL(uart_remove_one_port);
+struct uart_port_devres {
+ struct uart_driver *drv;
+ struct uart_port *port;
+};
+
+static void devm_uart_remove_one_port(struct device *dev, void *data)
+{
+ struct uart_port_devres *res = data;
+
+ uart_remove_one_port(res->drv, res->port);
+}
+
+/**
+ * devm_uart_add_one_port - managed variant of uart_register_driver()
+ * @dev: managed device
+ * @drv: pointer to the uart low level driver structure for this port
+ * @uport: uart port structure to use for this port.
+ *
+ * Context: task context, might sleep
+ *
+ * This is a devres wrapper around uart_add_one_port(). It allows the driver
+ * @drv to register its own uart_port structure with the core driver. The port
+ * will be unregistered on driver detach.
+ */
+int devm_uart_add_one_port(struct device *dev,
+ struct uart_driver *drv, struct uart_port *port)
+{
+ struct uart_port_devres *res;
+ int ret;
+
+ res = devres_alloc(devm_uart_remove_one_port, sizeof(*res), GFP_KERNEL);
+ if (!res)
+ return -1;
+
+ ret = uart_add_one_port(drv, port);
+ if (ret) {
+ devres_free(res);
+ return -1;
+ }
+
+ res->drv = drv;
+ res->port = port;
+ devres_add(dev, res);
+
+ return 0;
+}
+EXPORT_SYMBOL(devm_uart_add_one_port);
+
/**
* uart_match_port - are the two ports equivalent?
* @port1: first port
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index d657f2a42a7b..d0911f04706e 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -771,6 +771,12 @@ int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
bool uart_match_port(const struct uart_port *port1,
const struct uart_port *port2);
+/*
+ * UART devres
+ */
+int devm_uart_add_one_port(struct device *dev,
+ struct uart_driver *drv, struct uart_port *port);
+
/*
* Power Management
*/
--
2.37.2
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