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Release 4.11 drivers/input/serio/altera_ps2.c

/*
 * 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; }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Chou6598.48%150.00%
Tobias Klauser11.52%150.00%
Total66100.00%2100.00%

/* * 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; }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Chou36100.00%1100.00%
Total36100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Chou49100.00%1100.00%
Total49100.00%1100.00%


static void altera_ps2_close(struct serio *io) { struct ps2if *ps2if = io->port_data; writel(0, ps2if->base + 4); /* disable rx irq */ }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Chou3093.75%150.00%
Tobias Klauser26.25%150.00%
Total32100.00%2100.00%

/* * 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; }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Chou18258.71%133.33%
Tobias Klauser12640.65%133.33%
Roel Kluin20.65%133.33%
Total310100.00%3100.00%

/* * 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; }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Chou31100.00%1100.00%
Total31100.00%1100.00%

#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);

Overall Contributors

PersonTokensPropCommitsCommitProp
Thomas Chou48872.62%19.09%
Tobias Klauser13219.64%436.36%
Walter Goossens375.51%19.09%
Dinh Nguyen71.04%19.09%
Tejun Heo30.45%19.09%
Roel Kluin20.30%19.09%
Dmitry Torokhov20.30%19.09%
JJ Ding10.15%19.09%
Total672100.00%11100.00%
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