Input: add driver for Altera PS/2 controller (fb5bbee0) · Commits · e / devices / android_kernel_oneplus_sm7250

drivers/input/serio/Kconfig

+8 −0

Original line number	Diff line number	Diff line
		@@ -201,4 +201,12 @@ config SERIO_XILINX_XPS_PS2
		To compile this driver as a module, choose M here: the
		module will be called xilinx_ps2.

		config SERIO_ALTERA_PS2
		tristate "Altera UP PS/2 controller"
		help
		Say Y here if you have Altera University Program PS/2 ports.

		To compile this driver as a module, choose M here: the
		module will be called altera_ps2.

		endif

drivers/input/serio/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -22,3 +22,4 @@ obj-$(CONFIG_SERIO_MACEPS2) += maceps2.o
		obj-$(CONFIG_SERIO_LIBPS2) += libps2.o
		obj-$(CONFIG_SERIO_RAW) += serio_raw.o
		obj-$(CONFIG_SERIO_XILINX_XPS_PS2) += xilinx_ps2.o
		obj-$(CONFIG_SERIO_ALTERA_PS2) += altera_ps2.o

drivers/input/serio/altera_ps2.c

0 → 100644

+200 −0

Original line number	Diff line number	Diff line
		/*
		* 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/init.h>
		#include <linux/input.h>
		#include <linux/serio.h>
		#include <linux/interrupt.h>
		#include <linux/platform_device.h>
		#include <linux/io.h>

		#define DRV_NAME "altera_ps2"

		struct ps2if {
		struct serio *io;
		struct resource *iomem_res;
		void __iomem *base;
		unsigned irq;
		};

		/*
		* 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;
		int 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); /* disable rx irq */
		}

		/*
		* Add one device to this driver.
		*/
		static int altera_ps2_probe(struct platform_device *pdev)
		{
		struct ps2if *ps2if;
		struct serio *serio;
		int error;

		ps2if = kzalloc(sizeof(struct ps2if), GFP_KERNEL);
		serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
		if (!ps2if \|\| !serio) {
		error = -ENOMEM;
		goto err_free_mem;
		}

		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;

		ps2if->iomem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		if (ps2if->iomem_res == NULL) {
		error = -ENOENT;
		goto err_free_mem;
		}

		ps2if->irq = platform_get_irq(pdev, 0);
		if (ps2if->irq < 0) {
		error = -ENXIO;
		goto err_free_mem;
		}

		if (!request_mem_region(ps2if->iomem_res->start,
		resource_size(ps2if->iomem_res), pdev->name)) {
		error = -EBUSY;
		goto err_free_mem;
		}

		ps2if->base = ioremap(ps2if->iomem_res->start,
		resource_size(ps2if->iomem_res));
		if (!ps2if->base) {
		error = -ENOMEM;
		goto err_free_res;
		}

		error = request_irq(ps2if->irq, altera_ps2_rxint, 0, pdev->name, ps2if);
		if (error) {
		dev_err(&pdev->dev, "could not allocate IRQ %d: %d\n",
		ps2if->irq, error);
		goto err_unmap;
		}

		dev_info(&pdev->dev, "base %p, irq %d\n", ps2if->base, ps2if->irq);

		serio_register_port(ps2if->io);
		platform_set_drvdata(pdev, ps2if);

		return 0;

		err_unmap:
		iounmap(ps2if->base);
		err_free_res:
		release_mem_region(ps2if->iomem_res->start,
		resource_size(ps2if->iomem_res));
		err_free_mem:
		kfree(ps2if);
		kfree(serio);
		return error;
		}

		/*
		* Remove one device from this driver.
		*/
		static int altera_ps2_remove(struct platform_device *pdev)
		{
		struct ps2if *ps2if = platform_get_drvdata(pdev);

		platform_set_drvdata(pdev, NULL);
		serio_unregister_port(ps2if->io);
		free_irq(ps2if->irq, ps2if);
		iounmap(ps2if->base);
		release_mem_region(ps2if->iomem_res->start,
		resource_size(ps2if->iomem_res));
		kfree(ps2if);

		return 0;
		}

		/*
		* Our device driver structure
		*/
		static struct platform_driver altera_ps2_driver = {
		.probe = altera_ps2_probe,
		.remove = altera_ps2_remove,
		.driver = {
		.name = DRV_NAME,
		},
		};

		static int __init altera_ps2_init(void)
		{
		return platform_driver_register(&altera_ps2_driver);
		}

		static void __exit altera_ps2_exit(void)
		{
		platform_driver_unregister(&altera_ps2_driver);
		}

		module_init(altera_ps2_init);
		module_exit(altera_ps2_exit);

		MODULE_DESCRIPTION("Altera University Program PS2 controller driver");
		MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>");
		MODULE_LICENSE("GPL");
		MODULE_ALIAS("platform:" DRV_NAME);