[ARM PATCH] 1933/1: Convert PXA serial driver to device model and implement suspend and resume

Patch from Ian Campbell

Patch 1848/1 removed the hack for preserving FFUART over sleep.

This patch adds back that support in the correct place by converting
the PXA serial driver to use the driver model and hooking up the 
suspend and resume methods.

arch/arm/mach-pxa/generic.c

@@ -198,10 +198,26 @@ static struct platform_device pxafb_device = {
 	.resource	= pxafb_resources,
 };
 
+static struct platform_device ffuart_device = {
+	.name		= "pxa2xx-uart",
+	.id		= 0,
+};
+static struct platform_device btuart_device = {
+	.name		= "pxa2xx-uart",
+	.id		= 1,
+};
+static struct platform_device stuart_device = {
+	.name		= "pxa2xx-uart",
+	.id		= 2,
+};
+
 static struct platform_device *devices[] __initdata = {
 	&pxamci_device,
 	&udc_device,
 	&pxafb_device,
+	&ffuart_device,
+	&btuart_device,
+	&stuart_device,
 };
 
 static int __init pxa_init(void)

drivers/serial/pxa.c

@@ -35,6 +35,7 @@
 #include <linux/circ_buf.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
+#include <linux/device.h>
 
 #include <asm/io.h>
 #include <asm/hardware.h>
@@ -804,26 +805,76 @@ static struct uart_driver serial_pxa_reg = {
 	.cons		= PXA_CONSOLE,
 };
 
-static int __init serial_pxa_init(void)
+static int serial_pxa_suspend(struct device *_dev, u32 state, u32 level)
 {
-	int i, ret;
+        struct uart_pxa_port *sport = dev_get_drvdata(_dev);
 
-	ret = uart_register_driver(&serial_pxa_reg);
-	if (ret)
-		return ret;
+        if (sport && level == SUSPEND_DISABLE)
+                uart_suspend_port(&serial_pxa_reg, &sport->port);
+
+        return 0;
+}
+
+static int serial_pxa_resume(struct device *_dev, u32 level)
+{
+        struct uart_pxa_port *sport = dev_get_drvdata(_dev);
 
-	for (i = 0; i < ARRAY_SIZE(serial_pxa_ports); i++)
-		uart_add_one_port(&serial_pxa_reg, &serial_pxa_ports[i].port);
+        if (sport && level == RESUME_ENABLE)
+                uart_resume_port(&serial_pxa_reg, &sport->port);
 
         return 0;
 }
 
-static void __exit serial_pxa_exit(void)
+static int serial_pxa_probe(struct device *_dev)
 {
-	int i;
+	struct platform_device *dev = to_platform_device(_dev);
+
+	serial_pxa_ports[dev->id].port.dev = _dev;
+	uart_add_one_port(&serial_pxa_reg, &serial_pxa_ports[dev->id].port);
+	dev_set_drvdata(_dev, &serial_pxa_ports[dev->id]);
+	return 0;
+}
+
+static int serial_pxa_remove(struct device *_dev)
+{
+	struct uart_pxa_port *sport = dev_get_drvdata(_dev);
+
+	dev_set_drvdata(_dev, NULL);
+
+	if (sport)
+		uart_remove_one_port(&serial_pxa_reg, &sport->port);
+
+	return 0;
+}
+
+static struct device_driver serial_pxa_driver = {
+        .name           = "pxa2xx-uart",
+        .bus            = &platform_bus_type,
+        .probe          = serial_pxa_probe,
+        .remove         = serial_pxa_remove,
+
+	.suspend	= serial_pxa_suspend,
+	.resume		= serial_pxa_resume,
+};
+
+int __init serial_pxa_init(void)
+{
+	int ret;
+
+	ret = uart_register_driver(&serial_pxa_reg);
+	if (ret != 0)
+		return ret;
+
+	ret = driver_register(&serial_pxa_driver);
+	if (ret != 0)
+		uart_unregister_driver(&serial_pxa_reg);
 
-	for (i = 0; i < ARRAY_SIZE(serial_pxa_ports); i++)
-		uart_remove_one_port(&serial_pxa_reg, &serial_pxa_ports[i].port);
+	return ret;
+}
+
+void __exit serial_pxa_exit(void)
+{
+        driver_unregister(&serial_pxa_driver);
 	uart_unregister_driver(&serial_pxa_reg);
 }