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Input: sh_keysc - switch to using bitmaps 

Use bitmaps instead of using 32-bit integers to keep track of the key
states. With this change in place the driver supports key pads with
more than 32 keys.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Magnus Damm 2010-02-10 22:13:21 -08:00 committed by Dmitry Torokhov
parent 2b14a808fb
commit 324e5ade15
1 changed files with 44 additions and 25 deletions
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69
drivers/input/keyboard/sh_keysc.c
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@ -19,6 +19,7 @@
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/input/sh_keysc.h>
#include <linux/bitmap.h>
#include <linux/clk.h>
#include <linux/io.h>
@ -35,7 +36,7 @@ static const struct {
struct sh_keysc_priv {
void __iomem *iomem_base;
struct clk *clk;
unsigned long last_keys;
DECLARE_BITMAP(last_keys, SH_KEYSC_MAXKEYS);
struct input_dev *input;
struct sh_keysc_info pdata;
};
@ -71,69 +72,87 @@ static void sh_keysc_level_mode(struct sh_keysc_priv *p,
udelay(pdata->kycr2_delay);
}
static void sh_keysc_map_dbg(struct device *dev, unsigned long *map,
const char *str)
{
int k;
for (k = 0; k < BITS_TO_LONGS(SH_KEYSC_MAXKEYS); k++)
dev_dbg(dev, "%s[%d] 0x%lx\n", str, k, map[k]);
}
static irqreturn_t sh_keysc_isr(int irq, void *dev_id)
{
struct platform_device *pdev = dev_id;
struct sh_keysc_priv *priv = platform_get_drvdata(pdev);
struct sh_keysc_info *pdata = &priv->pdata;
unsigned long keys, keys1, keys0, mask;
int keyout_nr = sh_keysc_mode[pdata->mode].keyout;
int keyin_nr = sh_keysc_mode[pdata->mode].keyin;
DECLARE_BITMAP(keys, SH_KEYSC_MAXKEYS);
DECLARE_BITMAP(keys0, SH_KEYSC_MAXKEYS);
DECLARE_BITMAP(keys1, SH_KEYSC_MAXKEYS);
unsigned char keyin_set, tmp;
int i, k;
int i, k, n;
dev_dbg(&pdev->dev, "isr!\n");
keys1 = ~0;
keys0 = 0;
bitmap_fill(keys1, SH_KEYSC_MAXKEYS);
bitmap_zero(keys0, SH_KEYSC_MAXKEYS);
do {
keys = 0;
bitmap_zero(keys, SH_KEYSC_MAXKEYS);
keyin_set = 0;
sh_keysc_write(priv, KYCR2, KYCR2_IRQ_DISABLED);
for (i = 0; i < sh_keysc_mode[pdata->mode].keyout; i++) {
for (i = 0; i < keyout_nr; i++) {
n = keyin_nr * i;
/* drive one KEYOUT pin low, read KEYIN pins */
sh_keysc_write(priv, KYOUTDR, 0xfff ^ (3 << (i * 2)));
udelay(pdata->delay);
tmp = sh_keysc_read(priv, KYINDR);
keys |= tmp << (sh_keysc_mode[pdata->mode].keyin * i);
tmp ^= (1 << sh_keysc_mode[pdata->mode].keyin) - 1;
keyin_set |= tmp;
/* set bit if key press has been detected */
for (k = 0; k < keyin_nr; k++) {
if (tmp & (1 << k))
__set_bit(n + k, keys);
}
/* keep track of which KEYIN bits that have been set */
keyin_set |= tmp ^ ((1 << keyin_nr) - 1);
}
sh_keysc_level_mode(priv, keyin_set);
keys ^= ~0;
keys &= (1 << (sh_keysc_mode[pdata->mode].keyin *
sh_keysc_mode[pdata->mode].keyout)) - 1;
keys1 &= keys;
keys0 |= keys;
bitmap_complement(keys, keys, SH_KEYSC_MAXKEYS);
bitmap_and(keys1, keys1, keys, SH_KEYSC_MAXKEYS);
bitmap_or(keys0, keys0, keys, SH_KEYSC_MAXKEYS);
dev_dbg(&pdev->dev, "keys 0x%08lx\n", keys);
sh_keysc_map_dbg(&pdev->dev, keys, "keys");
} while (sh_keysc_read(priv, KYCR2) & 0x01);
dev_dbg(&pdev->dev, "last_keys 0x%08lx keys0 0x%08lx keys1 0x%08lx\n",
priv->last_keys, keys0, keys1);
sh_keysc_map_dbg(&pdev->dev, priv->last_keys, "last_keys");
sh_keysc_map_dbg(&pdev->dev, keys0, "keys0");
sh_keysc_map_dbg(&pdev->dev, keys1, "keys1");
for (i = 0; i < SH_KEYSC_MAXKEYS; i++) {
k = pdata->keycodes[i];
if (!k)
continue;
mask = 1 << i;
if (!((priv->last_keys ^ keys0) & mask))
if (test_bit(i, keys0) == test_bit(i, priv->last_keys))
continue;
if ((keys1 | keys0) & mask) {
if (test_bit(i, keys1) || test_bit(i, keys0)) {
input_event(priv->input, EV_KEY, k, 1);
priv->last_keys |= mask;
__set_bit(i, priv->last_keys);
}
if (!(keys1 & mask)) {
if (!test_bit(i, keys1)) {
input_event(priv->input, EV_KEY, k, 0);
priv->last_keys &= ~mask;
__clear_bit(i, priv->last_keys);
}
}