cregit-Linux how code gets into the kernel

Release 4.11 drivers/input/serio/sa1111ps2.c

/*
 *  linux/drivers/input/serio/sa1111ps2.c
 *
 *  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 as published by
 * the Free Software Foundation; either version 2 of the License.
 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/serio.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/spinlock.h>

#include <asm/io.h>

#include <asm/hardware/sa1111.h>


#define PS2CR		0x0000

#define PS2STAT		0x0004

#define PS2DATA		0x0008

#define PS2CLKDIV	0x000c

#define PS2PRECNT	0x0010


#define PS2CR_ENA	0x08

#define PS2CR_FKD	0x02

#define PS2CR_FKC	0x01


#define PS2STAT_STP	0x0100

#define PS2STAT_TXE	0x0080

#define PS2STAT_TXB	0x0040

#define PS2STAT_RXF	0x0020

#define PS2STAT_RXB	0x0010

#define PS2STAT_ENA	0x0008

#define PS2STAT_RXP	0x0004

#define PS2STAT_KBD	0x0002

#define PS2STAT_KBC	0x0001


struct ps2if {
	
struct serio		*io;
	
struct sa1111_dev	*dev;
	
void __iomem		*base;
	
unsigned int		open;
	
spinlock_t		lock;
	
unsigned int		head;
	
unsigned int		tail;
	
unsigned char		buf[4];
};

/*
 * Read all bytes waiting in the PS2 port.  There should be
 * at the most one, but we loop for safety.  If there was a
 * framing error, we have to manually clear the status.
 */

static irqreturn_t ps2_rxint(int irq, void *dev_id) { struct ps2if *ps2if = dev_id; unsigned int scancode, flag, status; status = sa1111_readl(ps2if->base + PS2STAT); while (status & PS2STAT_RXF) { if (status & PS2STAT_STP) sa1111_writel(PS2STAT_STP, ps2if->base + PS2STAT); flag = (status & PS2STAT_STP ? SERIO_FRAME : 0) | (status & PS2STAT_RXP ? 0 : SERIO_PARITY); scancode = sa1111_readl(ps2if->base + PS2DATA) & 0xff; if (hweight8(scancode) & 1) flag ^= SERIO_PARITY; serio_interrupt(ps2if->io, scancode, flag); status = sa1111_readl(ps2if->base + PS2STAT); } return IRQ_HANDLED; }

Contributors

PersonTokensPropCommitsCommitProp
Vojtech Pavlik11583.94%120.00%
Russell King2216.06%480.00%
Total137100.00%5100.00%

/* * Completion of ps2 write */
static irqreturn_t ps2_txint(int irq, void *dev_id) { struct ps2if *ps2if = dev_id; unsigned int status; spin_lock(&ps2if->lock); status = sa1111_readl(ps2if->base + PS2STAT); if (ps2if->head == ps2if->tail) { disable_irq_nosync(irq); /* done */ } else if (status & PS2STAT_TXE) { sa1111_writel(ps2if->buf[ps2if->tail], ps2if->base + PS2DATA); ps2if->tail = (ps2if->tail + 1) & (sizeof(ps2if->buf) - 1); } spin_unlock(&ps2if->lock); return IRQ_HANDLED; }

Contributors

PersonTokensPropCommitsCommitProp
Russell King11493.44%360.00%
Vojtech Pavlik75.74%120.00%
Ben Nizette10.82%120.00%
Total122100.00%5100.00%

/* * Write a byte to the PS2 port. We have to wait for the * port to indicate that the transmitter is empty. */
static int ps2_write(struct serio *io, unsigned char val) { struct ps2if *ps2if = io->port_data; unsigned long flags; unsigned int head; spin_lock_irqsave(&ps2if->lock, flags); /* * If the TX register is empty, we can go straight out. */ if (sa1111_readl(ps2if->base + PS2STAT) & PS2STAT_TXE) { sa1111_writel(val, ps2if->base + PS2DATA); } else { if (ps2if->head == ps2if->tail) enable_irq(ps2if->dev->irq[1]); head = (ps2if->head + 1) & (sizeof(ps2if->buf) - 1); if (head != ps2if->tail) { ps2if->buf[ps2if->head] = val; ps2if->head = head; } } spin_unlock_irqrestore(&ps2if->lock, flags); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Russell King10567.74%250.00%
Vojtech Pavlik4931.61%125.00%
Dmitry Torokhov10.65%125.00%
Total155100.00%4100.00%


static int ps2_open(struct serio *io) { struct ps2if *ps2if = io->port_data; int ret; ret = sa1111_enable_device(ps2if->dev); if (ret) return ret; ret = request_irq(ps2if->dev->irq[0], ps2_rxint, 0, SA1111_DRIVER_NAME(ps2if->dev), ps2if); if (ret) { printk(KERN_ERR "sa1111ps2: could not allocate IRQ%d: %d\n", ps2if->dev->irq[0], ret); sa1111_disable_device(ps2if->dev); return ret; } ret = request_irq(ps2if->dev->irq[1], ps2_txint, 0, SA1111_DRIVER_NAME(ps2if->dev), ps2if); if (ret) { printk(KERN_ERR "sa1111ps2: could not allocate IRQ%d: %d\n", ps2if->dev->irq[1], ret); free_irq(ps2if->dev->irq[0], ps2if); sa1111_disable_device(ps2if->dev); return ret; } ps2if->open = 1; enable_irq_wake(ps2if->dev->irq[0]); sa1111_writel(PS2CR_ENA, ps2if->base + PS2CR); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Russell King13867.32%466.67%
Vojtech Pavlik6632.20%116.67%
Dmitry Torokhov10.49%116.67%
Total205100.00%6100.00%


static void ps2_close(struct serio *io) { struct ps2if *ps2if = io->port_data; sa1111_writel(0, ps2if->base + PS2CR); disable_irq_wake(ps2if->dev->irq[0]); ps2if->open = 0; free_irq(ps2if->dev->irq[1], ps2if); free_irq(ps2if->dev->irq[0], ps2if); sa1111_disable_device(ps2if->dev); }

Contributors

PersonTokensPropCommitsCommitProp
Russell King4452.38%360.00%
Vojtech Pavlik3946.43%120.00%
Dmitry Torokhov11.19%120.00%
Total84100.00%5100.00%

/* * Clear the input buffer. */
static void ps2_clear_input(struct ps2if *ps2if) { int maxread = 100; while (maxread--) { if ((sa1111_readl(ps2if->base + PS2DATA) & 0xff) == 0xff) break; } }

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PersonTokensPropCommitsCommitProp
Vojtech Pavlik3892.68%133.33%
Russell King37.32%266.67%
Total41100.00%3100.00%


static unsigned int ps2_test_one(struct ps2if *ps2if, unsigned int mask) { unsigned int val; sa1111_writel(PS2CR_ENA | mask, ps2if->base + PS2CR); udelay(2); val = sa1111_readl(ps2if->base + PS2STAT); return val & (PS2STAT_KBC | PS2STAT_KBD); }

Contributors

PersonTokensPropCommitsCommitProp
Vojtech Pavlik5391.38%133.33%
Russell King58.62%266.67%
Total58100.00%3100.00%

/* * Test the keyboard interface. We basically check to make sure that * we can drive each line to the keyboard independently of each other. */
static int ps2_test(struct ps2if *ps2if) { unsigned int stat; int ret = 0; stat = ps2_test_one(ps2if, PS2CR_FKC); if (stat != PS2STAT_KBD) { printk("PS/2 interface test failed[1]: %02x\n", stat); ret = -ENODEV; } stat = ps2_test_one(ps2if, 0); if (stat != (PS2STAT_KBC | PS2STAT_KBD)) { printk("PS/2 interface test failed[2]: %02x\n", stat); ret = -ENODEV; } stat = ps2_test_one(ps2if, PS2CR_FKD); if (stat != PS2STAT_KBC) { printk("PS/2 interface test failed[3]: %02x\n", stat); ret = -ENODEV; } sa1111_writel(0, ps2if->base + PS2CR); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Vojtech Pavlik11692.80%133.33%
Russell King97.20%266.67%
Total125100.00%3100.00%

/* * Add one device to this driver. */
static int ps2_probe(struct sa1111_dev *dev) { struct ps2if *ps2if; struct serio *serio; int ret; ps2if = kzalloc(sizeof(struct ps2if), GFP_KERNEL); serio = kzalloc(sizeof(struct serio), GFP_KERNEL); if (!ps2if || !serio) { ret = -ENOMEM; goto free; } serio->id.type = SERIO_8042; serio->write = ps2_write; serio->open = ps2_open; serio->close = ps2_close; strlcpy(serio->name, dev_name(&dev->dev), sizeof(serio->name)); strlcpy(serio->phys, dev_name(&dev->dev), sizeof(serio->phys)); serio->port_data = ps2if; serio->dev.parent = &dev->dev; ps2if->io = serio; ps2if->dev = dev; sa1111_set_drvdata(dev, ps2if); spin_lock_init(&ps2if->lock); /* * Request the physical region for this PS2 port. */ if (!request_mem_region(dev->res.start, dev->res.end - dev->res.start + 1, SA1111_DRIVER_NAME(dev))) { ret = -EBUSY; goto free; } /* * Our parent device has already mapped the region. */ ps2if->base = dev->mapbase; sa1111_enable_device(ps2if->dev); /* Incoming clock is 8MHz */ sa1111_writel(0, ps2if->base + PS2CLKDIV); sa1111_writel(127, ps2if->base + PS2PRECNT); /* * Flush any pending input. */ ps2_clear_input(ps2if); /* * Test the keyboard interface. */ ret = ps2_test(ps2if); if (ret) goto out; /* * Flush any pending input. */ ps2_clear_input(ps2if); sa1111_disable_device(ps2if->dev); serio_register_port(ps2if->io); return 0; out: sa1111_disable_device(ps2if->dev); release_mem_region(dev->res.start, resource_size(&dev->res)); free: sa1111_set_drvdata(dev, NULL); kfree(ps2if); kfree(serio); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Russell King15543.66%327.27%
Vojtech Pavlik10629.86%19.09%
Dmitry Torokhov8022.54%436.36%
Kay Sievers82.25%19.09%
Joe Perches41.13%19.09%
Yoann Padioleau20.56%19.09%
Total355100.00%11100.00%

/* * Remove one device from this driver. */
static int ps2_remove(struct sa1111_dev *dev) { struct ps2if *ps2if = sa1111_get_drvdata(dev); serio_unregister_port(ps2if->io); release_mem_region(dev->res.start, resource_size(&dev->res)); sa1111_set_drvdata(dev, NULL); kfree(ps2if); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Russell King3965.00%250.00%
Vojtech Pavlik1728.33%125.00%
Joe Perches46.67%125.00%
Total60100.00%4100.00%

/* * Our device driver structure */ static struct sa1111_driver ps2_driver = { .drv = { .name = "sa1111-ps2", .owner = THIS_MODULE, }, .devid = SA1111_DEVID_PS2, .probe = ps2_probe, .remove = ps2_remove, };
static int __init ps2_init(void) { return sa1111_driver_register(&ps2_driver); }

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PersonTokensPropCommitsCommitProp
Vojtech Pavlik1381.25%133.33%
Russell King318.75%266.67%
Total16100.00%3100.00%


static void __exit ps2_exit(void) { sa1111_driver_unregister(&ps2_driver); }

Contributors

PersonTokensPropCommitsCommitProp
Vojtech Pavlik1386.67%133.33%
Russell King213.33%266.67%
Total15100.00%3100.00%

module_init(ps2_init); module_exit(ps2_exit); MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); MODULE_DESCRIPTION("SA1111 PS2 controller driver"); MODULE_LICENSE("GPL");

Overall Contributors

PersonTokensPropCommitsCommitProp
Russell King76748.15%1155.00%
Vojtech Pavlik72345.39%15.00%
Dmitry Torokhov845.27%420.00%
Kay Sievers80.50%15.00%
Joe Perches80.50%15.00%
Yoann Padioleau20.13%15.00%
Ben Nizette10.06%15.00%
Total1593100.00%20100.00%
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