Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / input / serio / altera_ps2.c

diff --git a/kernel/drivers/input/serio/altera_ps2.c b/kernel/drivers/input/serio/altera_ps2.c
new file mode 100644 (file)
index 0000000..131d782
--- /dev/null
+++ b/kernel/drivers/input/serio/altera_ps2.c
@@ -0,0 +1,167 @@
+/*
+ * Altera University Program PS2 controller driver
+ *
+ * Copyright (C) 2008 Thomas Chou <thomas@wytron.com.tw>
+ *
+ * Based on sa1111ps2.c, which is:
+ * Copyright (C) 2002 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/input.h>
+#include <linux/serio.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+
+#define DRV_NAME "altera_ps2"
+
+struct ps2if {
+       struct serio *io;
+       void __iomem *base;
+};
+
+/*
+ * Read all bytes waiting in the PS2 port.  There should be
+ * at the most one, but we loop for safety.
+ */
+static irqreturn_t altera_ps2_rxint(int irq, void *dev_id)
+{
+       struct ps2if *ps2if = dev_id;
+       unsigned int status;
+       irqreturn_t handled = IRQ_NONE;
+
+       while ((status = readl(ps2if->base)) & 0xffff0000) {
+               serio_interrupt(ps2if->io, status & 0xff, 0);
+               handled = IRQ_HANDLED;
+       }
+
+       return handled;
+}
+
+/*
+ * Write a byte to the PS2 port.
+ */
+static int altera_ps2_write(struct serio *io, unsigned char val)
+{
+       struct ps2if *ps2if = io->port_data;
+
+       writel(val, ps2if->base);
+       return 0;
+}
+
+static int altera_ps2_open(struct serio *io)
+{
+       struct ps2if *ps2if = io->port_data;
+
+       /* clear fifo */
+       while (readl(ps2if->base) & 0xffff0000)
+               /* empty */;
+
+       writel(1, ps2if->base + 4); /* enable rx irq */
+       return 0;
+}
+
+static void altera_ps2_close(struct serio *io)
+{
+       struct ps2if *ps2if = io->port_data;
+
+       writel(0, ps2if->base + 4); /* disable rx irq */
+}
+
+/*
+ * Add one device to this driver.
+ */
+static int altera_ps2_probe(struct platform_device *pdev)
+{
+       struct ps2if *ps2if;
+       struct resource *res;
+       struct serio *serio;
+       int error, irq;
+
+       ps2if = devm_kzalloc(&pdev->dev, sizeof(struct ps2if), GFP_KERNEL);
+       if (!ps2if)
+               return -ENOMEM;
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       ps2if->base = devm_ioremap_resource(&pdev->dev, res);
+       if (IS_ERR(ps2if->base))
+               return PTR_ERR(ps2if->base);
+
+       irq = platform_get_irq(pdev, 0);
+       if (irq < 0)
+               return -ENXIO;
+
+       error = devm_request_irq(&pdev->dev, irq, altera_ps2_rxint, 0,
+                                pdev->name, ps2if);
+       if (error) {
+               dev_err(&pdev->dev, "could not request IRQ %d\n", irq);
+               return error;
+       }
+
+       serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
+       if (!serio)
+               return -ENOMEM;
+
+       serio->id.type          = SERIO_8042;
+       serio->write            = altera_ps2_write;
+       serio->open             = altera_ps2_open;
+       serio->close            = altera_ps2_close;
+       strlcpy(serio->name, dev_name(&pdev->dev), sizeof(serio->name));
+       strlcpy(serio->phys, dev_name(&pdev->dev), sizeof(serio->phys));
+       serio->port_data        = ps2if;
+       serio->dev.parent       = &pdev->dev;
+       ps2if->io               = serio;
+
+       dev_info(&pdev->dev, "base %p, irq %d\n", ps2if->base, irq);
+
+       serio_register_port(ps2if->io);
+       platform_set_drvdata(pdev, ps2if);
+
+       return 0;
+}
+
+/*
+ * Remove one device from this driver.
+ */
+static int altera_ps2_remove(struct platform_device *pdev)
+{
+       struct ps2if *ps2if = platform_get_drvdata(pdev);
+
+       serio_unregister_port(ps2if->io);
+
+       return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id altera_ps2_match[] = {
+       { .compatible = "ALTR,ps2-1.0", },
+       { .compatible = "altr,ps2-1.0", },
+       {},
+};
+MODULE_DEVICE_TABLE(of, altera_ps2_match);
+#endif /* CONFIG_OF */
+
+/*
+ * Our device driver structure
+ */
+static struct platform_driver altera_ps2_driver = {
+       .probe          = altera_ps2_probe,
+       .remove         = altera_ps2_remove,
+       .driver = {
+               .name   = DRV_NAME,
+               .of_match_table = of_match_ptr(altera_ps2_match),
+       },
+};
+module_platform_driver(altera_ps2_driver);
+
+MODULE_DESCRIPTION("Altera University Program PS2 controller driver");
+MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);