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alistair23-linux/drivers/input/keyboard/davinci_keyscan.c
Thomas Gleixner 1a59d1b8e0 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 
Based on 1 normalized pattern(s):

  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 or at
  your option any later version this program is distributed in the
  hope that it will be useful but without any warranty without even
  the implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details you
  should have received a copy of the gnu general public license along
  with this program if not write to the free software foundation inc
  59 temple place suite 330 boston ma 02111 1307 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1334 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:35 -07:00

317 lines
8.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* DaVinci Key Scan Driver for TI platforms
*
* Copyright (C) 2009 Texas Instruments, Inc
*
* Author: Miguel Aguilar <miguel.aguilar@ridgerun.com>
*
* Initial Code: Sandeep Paulraj <s-paulraj@ti.com>
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/types.h>
#include <linux/input.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/platform_data/keyscan-davinci.h>
/* Key scan registers */
#define DAVINCI_KEYSCAN_KEYCTRL 0x0000
#define DAVINCI_KEYSCAN_INTENA 0x0004
#define DAVINCI_KEYSCAN_INTFLAG 0x0008
#define DAVINCI_KEYSCAN_INTCLR 0x000c
#define DAVINCI_KEYSCAN_STRBWIDTH 0x0010
#define DAVINCI_KEYSCAN_INTERVAL 0x0014
#define DAVINCI_KEYSCAN_CONTTIME 0x0018
#define DAVINCI_KEYSCAN_CURRENTST 0x001c
#define DAVINCI_KEYSCAN_PREVSTATE 0x0020
#define DAVINCI_KEYSCAN_EMUCTRL 0x0024
#define DAVINCI_KEYSCAN_IODFTCTRL 0x002c
/* Key Control Register (KEYCTRL) */
#define DAVINCI_KEYSCAN_KEYEN 0x00000001
#define DAVINCI_KEYSCAN_PREVMODE 0x00000002
#define DAVINCI_KEYSCAN_CHATOFF 0x00000004
#define DAVINCI_KEYSCAN_AUTODET 0x00000008
#define DAVINCI_KEYSCAN_SCANMODE 0x00000010
#define DAVINCI_KEYSCAN_OUTTYPE 0x00000020
/* Masks for the interrupts */
#define DAVINCI_KEYSCAN_INT_CONT 0x00000008
#define DAVINCI_KEYSCAN_INT_OFF 0x00000004
#define DAVINCI_KEYSCAN_INT_ON 0x00000002
#define DAVINCI_KEYSCAN_INT_CHANGE 0x00000001
#define DAVINCI_KEYSCAN_INT_ALL 0x0000000f
struct davinci_ks {
struct input_dev *input;
struct davinci_ks_platform_data *pdata;
int irq;
void __iomem *base;
resource_size_t pbase;
size_t base_size;
unsigned short keymap[];
};
/* Initializing the kp Module */
static int __init davinci_ks_initialize(struct davinci_ks *davinci_ks)
{
struct device *dev = &davinci_ks->input->dev;
struct davinci_ks_platform_data *pdata = davinci_ks->pdata;
u32 matrix_ctrl;
/* Enable all interrupts */
__raw_writel(DAVINCI_KEYSCAN_INT_ALL,
davinci_ks->base + DAVINCI_KEYSCAN_INTENA);
/* Clear interrupts if any */
__raw_writel(DAVINCI_KEYSCAN_INT_ALL,
davinci_ks->base + DAVINCI_KEYSCAN_INTCLR);
/* Setup the scan period = strobe + interval */
__raw_writel(pdata->strobe,
davinci_ks->base + DAVINCI_KEYSCAN_STRBWIDTH);
__raw_writel(pdata->interval,
davinci_ks->base + DAVINCI_KEYSCAN_INTERVAL);
__raw_writel(0x01,
davinci_ks->base + DAVINCI_KEYSCAN_CONTTIME);
/* Define matrix type */
switch (pdata->matrix_type) {
case DAVINCI_KEYSCAN_MATRIX_4X4:
matrix_ctrl = 0;
break;
case DAVINCI_KEYSCAN_MATRIX_5X3:
matrix_ctrl = (1 << 6);
break;
default:
dev_err(dev->parent, "wrong matrix type\n");
return -EINVAL;
}
/* Enable key scan module and set matrix type */
__raw_writel(DAVINCI_KEYSCAN_AUTODET | DAVINCI_KEYSCAN_KEYEN |
matrix_ctrl, davinci_ks->base + DAVINCI_KEYSCAN_KEYCTRL);
return 0;
}
static irqreturn_t davinci_ks_interrupt(int irq, void *dev_id)
{
struct davinci_ks *davinci_ks = dev_id;
struct device *dev = &davinci_ks->input->dev;
unsigned short *keymap = davinci_ks->keymap;
int keymapsize = davinci_ks->pdata->keymapsize;
u32 prev_status, new_status, changed;
bool release;
int keycode = KEY_UNKNOWN;
int i;
/* Disable interrupt */
__raw_writel(0x0, davinci_ks->base + DAVINCI_KEYSCAN_INTENA);
/* Reading previous and new status of the key scan */
prev_status = __raw_readl(davinci_ks->base + DAVINCI_KEYSCAN_PREVSTATE);
new_status = __raw_readl(davinci_ks->base + DAVINCI_KEYSCAN_CURRENTST);
changed = prev_status ^ new_status;
if (changed) {
/*
* It goes through all bits in 'changed' to ensure
* that no key changes are being missed
*/
for (i = 0 ; i < keymapsize; i++) {
if ((changed>>i) & 0x1) {
keycode = keymap[i];
release = (new_status >> i) & 0x1;
dev_dbg(dev->parent, "key %d %s\n", keycode,
release ? "released" : "pressed");
input_report_key(davinci_ks->input, keycode,
!release);
input_sync(davinci_ks->input);
}
}
/* Clearing interrupt */
__raw_writel(DAVINCI_KEYSCAN_INT_ALL,
davinci_ks->base + DAVINCI_KEYSCAN_INTCLR);
}
/* Enable interrupts */
__raw_writel(0x1, davinci_ks->base + DAVINCI_KEYSCAN_INTENA);
return IRQ_HANDLED;
}
static int __init davinci_ks_probe(struct platform_device *pdev)
{
struct davinci_ks *davinci_ks;
struct input_dev *key_dev;
struct resource *res, *mem;
struct device *dev = &pdev->dev;
struct davinci_ks_platform_data *pdata = dev_get_platdata(dev);
int error, i;
if (pdata->device_enable) {
error = pdata->device_enable(dev);
if (error < 0) {
dev_dbg(dev, "device enable function failed\n");
return error;
}
}
if (!pdata->keymap) {
dev_dbg(dev, "no keymap from pdata\n");
return -EINVAL;
}
davinci_ks = kzalloc(sizeof(struct davinci_ks) +
sizeof(unsigned short) * pdata->keymapsize, GFP_KERNEL);
if (!davinci_ks) {
dev_dbg(dev, "could not allocate memory for private data\n");
return -ENOMEM;
}
memcpy(davinci_ks->keymap, pdata->keymap,
sizeof(unsigned short) * pdata->keymapsize);
key_dev = input_allocate_device();
if (!key_dev) {
dev_dbg(dev, "could not allocate input device\n");
error = -ENOMEM;
goto fail1;
}
davinci_ks->input = key_dev;
davinci_ks->irq = platform_get_irq(pdev, 0);
if (davinci_ks->irq < 0) {
dev_err(dev, "no key scan irq\n");
error = davinci_ks->irq;
goto fail2;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(dev, "no mem resource\n");
error = -EINVAL;
goto fail2;
}
davinci_ks->pbase = res->start;
davinci_ks->base_size = resource_size(res);
mem = request_mem_region(davinci_ks->pbase, davinci_ks->base_size,
pdev->name);
if (!mem) {
dev_err(dev, "key scan registers at %08x are not free\n",
davinci_ks->pbase);
error = -EBUSY;
goto fail2;
}
davinci_ks->base = ioremap(davinci_ks->pbase, davinci_ks->base_size);
if (!davinci_ks->base) {
dev_err(dev, "can't ioremap MEM resource.\n");
error = -ENOMEM;
goto fail3;
}
/* Enable auto repeat feature of Linux input subsystem */
if (pdata->rep)
__set_bit(EV_REP, key_dev->evbit);
/* Setup input device */
__set_bit(EV_KEY, key_dev->evbit);
/* Setup the platform data */
davinci_ks->pdata = pdata;
for (i = 0; i < davinci_ks->pdata->keymapsize; i++)
__set_bit(davinci_ks->pdata->keymap[i], key_dev->keybit);
key_dev->name = "davinci_keyscan";
key_dev->phys = "davinci_keyscan/input0";
key_dev->dev.parent = dev;
key_dev->id.bustype = BUS_HOST;
key_dev->id.vendor = 0x0001;
key_dev->id.product = 0x0001;
key_dev->id.version = 0x0001;
key_dev->keycode = davinci_ks->keymap;
key_dev->keycodesize = sizeof(davinci_ks->keymap[0]);
key_dev->keycodemax = davinci_ks->pdata->keymapsize;
error = input_register_device(davinci_ks->input);
if (error < 0) {
dev_err(dev, "unable to register davinci key scan device\n");
goto fail4;
}
error = request_irq(davinci_ks->irq, davinci_ks_interrupt,
0, pdev->name, davinci_ks);
if (error < 0) {
dev_err(dev, "unable to register davinci key scan interrupt\n");
goto fail5;
}
error = davinci_ks_initialize(davinci_ks);
if (error < 0) {
dev_err(dev, "unable to initialize davinci key scan device\n");
goto fail6;
}
platform_set_drvdata(pdev, davinci_ks);
return 0;
fail6:
free_irq(davinci_ks->irq, davinci_ks);
fail5:
input_unregister_device(davinci_ks->input);
key_dev = NULL;
fail4:
iounmap(davinci_ks->base);
fail3:
release_mem_region(davinci_ks->pbase, davinci_ks->base_size);
fail2:
input_free_device(key_dev);
fail1:
kfree(davinci_ks);
return error;
}
static int davinci_ks_remove(struct platform_device *pdev)
{
struct davinci_ks *davinci_ks = platform_get_drvdata(pdev);
free_irq(davinci_ks->irq, davinci_ks);
input_unregister_device(davinci_ks->input);
iounmap(davinci_ks->base);
release_mem_region(davinci_ks->pbase, davinci_ks->base_size);
kfree(davinci_ks);
return 0;
}
static struct platform_driver davinci_ks_driver = {
.driver = {
.name = "davinci_keyscan",
},
.remove = davinci_ks_remove,
};
module_platform_driver_probe(davinci_ks_driver, davinci_ks_probe);
MODULE_AUTHOR("Miguel Aguilar");
MODULE_DESCRIPTION("Texas Instruments DaVinci Key Scan Driver");
MODULE_LICENSE("GPL");
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