335 lines
7.7 KiB
C
335 lines
7.7 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* SuperH KEYSC Keypad Driver
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*
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* Copyright (C) 2008 Magnus Damm
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*
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* Based on gpio_keys.c, Copyright 2005 Phil Blundell
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/input.h>
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#include <linux/input/sh_keysc.h>
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#include <linux/bitmap.h>
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#include <linux/pm_runtime.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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static const struct {
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unsigned char kymd, keyout, keyin;
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} sh_keysc_mode[] = {
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[SH_KEYSC_MODE_1] = { 0, 6, 5 },
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[SH_KEYSC_MODE_2] = { 1, 5, 6 },
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[SH_KEYSC_MODE_3] = { 2, 4, 7 },
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[SH_KEYSC_MODE_4] = { 3, 6, 6 },
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[SH_KEYSC_MODE_5] = { 4, 6, 7 },
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[SH_KEYSC_MODE_6] = { 5, 8, 8 },
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};
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struct sh_keysc_priv {
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void __iomem *iomem_base;
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DECLARE_BITMAP(last_keys, SH_KEYSC_MAXKEYS);
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struct input_dev *input;
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struct sh_keysc_info pdata;
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};
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#define KYCR1 0
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#define KYCR2 1
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#define KYINDR 2
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#define KYOUTDR 3
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#define KYCR2_IRQ_LEVEL 0x10
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#define KYCR2_IRQ_DISABLED 0x00
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static unsigned long sh_keysc_read(struct sh_keysc_priv *p, int reg_nr)
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{
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return ioread16(p->iomem_base + (reg_nr << 2));
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}
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static void sh_keysc_write(struct sh_keysc_priv *p, int reg_nr,
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unsigned long value)
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{
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iowrite16(value, p->iomem_base + (reg_nr << 2));
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}
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static void sh_keysc_level_mode(struct sh_keysc_priv *p,
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unsigned long keys_set)
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{
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struct sh_keysc_info *pdata = &p->pdata;
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sh_keysc_write(p, KYOUTDR, 0);
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sh_keysc_write(p, KYCR2, KYCR2_IRQ_LEVEL | (keys_set << 8));
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if (pdata->kycr2_delay)
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udelay(pdata->kycr2_delay);
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}
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static void sh_keysc_map_dbg(struct device *dev, unsigned long *map,
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const char *str)
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{
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int k;
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for (k = 0; k < BITS_TO_LONGS(SH_KEYSC_MAXKEYS); k++)
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dev_dbg(dev, "%s[%d] 0x%lx\n", str, k, map[k]);
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}
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static irqreturn_t sh_keysc_isr(int irq, void *dev_id)
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{
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struct platform_device *pdev = dev_id;
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struct sh_keysc_priv *priv = platform_get_drvdata(pdev);
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struct sh_keysc_info *pdata = &priv->pdata;
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int keyout_nr = sh_keysc_mode[pdata->mode].keyout;
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int keyin_nr = sh_keysc_mode[pdata->mode].keyin;
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DECLARE_BITMAP(keys, SH_KEYSC_MAXKEYS);
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DECLARE_BITMAP(keys0, SH_KEYSC_MAXKEYS);
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DECLARE_BITMAP(keys1, SH_KEYSC_MAXKEYS);
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unsigned char keyin_set, tmp;
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int i, k, n;
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dev_dbg(&pdev->dev, "isr!\n");
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bitmap_fill(keys1, SH_KEYSC_MAXKEYS);
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bitmap_zero(keys0, SH_KEYSC_MAXKEYS);
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do {
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bitmap_zero(keys, SH_KEYSC_MAXKEYS);
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keyin_set = 0;
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sh_keysc_write(priv, KYCR2, KYCR2_IRQ_DISABLED);
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for (i = 0; i < keyout_nr; i++) {
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n = keyin_nr * i;
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/* drive one KEYOUT pin low, read KEYIN pins */
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sh_keysc_write(priv, KYOUTDR, 0xffff ^ (3 << (i * 2)));
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udelay(pdata->delay);
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tmp = sh_keysc_read(priv, KYINDR);
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/* set bit if key press has been detected */
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for (k = 0; k < keyin_nr; k++) {
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if (tmp & (1 << k))
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__set_bit(n + k, keys);
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}
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/* keep track of which KEYIN bits that have been set */
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keyin_set |= tmp ^ ((1 << keyin_nr) - 1);
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}
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sh_keysc_level_mode(priv, keyin_set);
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bitmap_complement(keys, keys, SH_KEYSC_MAXKEYS);
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bitmap_and(keys1, keys1, keys, SH_KEYSC_MAXKEYS);
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bitmap_or(keys0, keys0, keys, SH_KEYSC_MAXKEYS);
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sh_keysc_map_dbg(&pdev->dev, keys, "keys");
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} while (sh_keysc_read(priv, KYCR2) & 0x01);
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sh_keysc_map_dbg(&pdev->dev, priv->last_keys, "last_keys");
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sh_keysc_map_dbg(&pdev->dev, keys0, "keys0");
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sh_keysc_map_dbg(&pdev->dev, keys1, "keys1");
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for (i = 0; i < SH_KEYSC_MAXKEYS; i++) {
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k = pdata->keycodes[i];
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if (!k)
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continue;
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if (test_bit(i, keys0) == test_bit(i, priv->last_keys))
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continue;
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if (test_bit(i, keys1) || test_bit(i, keys0)) {
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input_event(priv->input, EV_KEY, k, 1);
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__set_bit(i, priv->last_keys);
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}
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if (!test_bit(i, keys1)) {
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input_event(priv->input, EV_KEY, k, 0);
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__clear_bit(i, priv->last_keys);
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}
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}
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input_sync(priv->input);
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return IRQ_HANDLED;
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}
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static int sh_keysc_probe(struct platform_device *pdev)
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{
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struct sh_keysc_priv *priv;
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struct sh_keysc_info *pdata;
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struct resource *res;
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struct input_dev *input;
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int i;
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int irq, error;
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if (!dev_get_platdata(&pdev->dev)) {
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dev_err(&pdev->dev, "no platform data defined\n");
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error = -EINVAL;
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goto err0;
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}
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error = -ENXIO;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (res == NULL) {
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dev_err(&pdev->dev, "failed to get I/O memory\n");
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goto err0;
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}
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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goto err0;
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (priv == NULL) {
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dev_err(&pdev->dev, "failed to allocate driver data\n");
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error = -ENOMEM;
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goto err0;
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}
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platform_set_drvdata(pdev, priv);
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memcpy(&priv->pdata, dev_get_platdata(&pdev->dev), sizeof(priv->pdata));
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pdata = &priv->pdata;
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priv->iomem_base = ioremap(res->start, resource_size(res));
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if (priv->iomem_base == NULL) {
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dev_err(&pdev->dev, "failed to remap I/O memory\n");
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error = -ENXIO;
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goto err1;
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}
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priv->input = input_allocate_device();
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if (!priv->input) {
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dev_err(&pdev->dev, "failed to allocate input device\n");
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error = -ENOMEM;
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goto err2;
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}
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input = priv->input;
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input->evbit[0] = BIT_MASK(EV_KEY);
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input->name = pdev->name;
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input->phys = "sh-keysc-keys/input0";
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input->dev.parent = &pdev->dev;
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input->id.bustype = BUS_HOST;
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input->id.vendor = 0x0001;
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input->id.product = 0x0001;
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input->id.version = 0x0100;
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input->keycode = pdata->keycodes;
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input->keycodesize = sizeof(pdata->keycodes[0]);
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input->keycodemax = ARRAY_SIZE(pdata->keycodes);
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error = request_threaded_irq(irq, NULL, sh_keysc_isr, IRQF_ONESHOT,
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dev_name(&pdev->dev), pdev);
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if (error) {
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dev_err(&pdev->dev, "failed to request IRQ\n");
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goto err3;
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}
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for (i = 0; i < SH_KEYSC_MAXKEYS; i++)
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__set_bit(pdata->keycodes[i], input->keybit);
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__clear_bit(KEY_RESERVED, input->keybit);
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error = input_register_device(input);
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if (error) {
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dev_err(&pdev->dev, "failed to register input device\n");
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goto err4;
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}
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pm_runtime_enable(&pdev->dev);
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pm_runtime_get_sync(&pdev->dev);
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sh_keysc_write(priv, KYCR1, (sh_keysc_mode[pdata->mode].kymd << 8) |
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pdata->scan_timing);
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sh_keysc_level_mode(priv, 0);
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device_init_wakeup(&pdev->dev, 1);
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return 0;
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err4:
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free_irq(irq, pdev);
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err3:
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input_free_device(input);
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err2:
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iounmap(priv->iomem_base);
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err1:
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kfree(priv);
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err0:
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return error;
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}
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static int sh_keysc_remove(struct platform_device *pdev)
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{
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struct sh_keysc_priv *priv = platform_get_drvdata(pdev);
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sh_keysc_write(priv, KYCR2, KYCR2_IRQ_DISABLED);
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input_unregister_device(priv->input);
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free_irq(platform_get_irq(pdev, 0), pdev);
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iounmap(priv->iomem_base);
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pm_runtime_put_sync(&pdev->dev);
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pm_runtime_disable(&pdev->dev);
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kfree(priv);
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return 0;
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}
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static int sh_keysc_suspend(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct sh_keysc_priv *priv = platform_get_drvdata(pdev);
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int irq = platform_get_irq(pdev, 0);
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unsigned short value;
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value = sh_keysc_read(priv, KYCR1);
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if (device_may_wakeup(dev)) {
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sh_keysc_write(priv, KYCR1, value | 0x80);
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enable_irq_wake(irq);
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} else {
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sh_keysc_write(priv, KYCR1, value & ~0x80);
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pm_runtime_put_sync(dev);
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}
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return 0;
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}
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static int sh_keysc_resume(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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int irq = platform_get_irq(pdev, 0);
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if (device_may_wakeup(dev))
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disable_irq_wake(irq);
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else
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pm_runtime_get_sync(dev);
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return 0;
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}
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static DEFINE_SIMPLE_DEV_PM_OPS(sh_keysc_dev_pm_ops,
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sh_keysc_suspend, sh_keysc_resume);
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static struct platform_driver sh_keysc_device_driver = {
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.probe = sh_keysc_probe,
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.remove = sh_keysc_remove,
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.driver = {
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.name = "sh_keysc",
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.pm = pm_sleep_ptr(&sh_keysc_dev_pm_ops),
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}
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};
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module_platform_driver(sh_keysc_device_driver);
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MODULE_AUTHOR("Magnus Damm");
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MODULE_DESCRIPTION("SuperH KEYSC Keypad Driver");
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MODULE_LICENSE("GPL");
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